├── bpf_bpfeb.o
├── bpf_bpfel.o
├── proxy_server
├── go.mod
├── headers
    ├── update.sh
    └── bpf
    │   ├── LICENSE.BSD-2-Clause
    │   ├── bpf_endian.h
    │   ├── bpf_helpers.h
    │   ├── bpf_tracing.h
    │   └── bpf_helper_defs.h
├── README.md
├── go.sum
├── main.go
├── proxy_server.c
├── bpf_bpfeb.go
├── bpf_bpfel.go
└── main.go.bak


/bpf_bpfeb.o:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/vinhjaxt/eBPF-sockmap-proxy/HEAD/bpf_bpfeb.o


--------------------------------------------------------------------------------
/bpf_bpfel.o:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/vinhjaxt/eBPF-sockmap-proxy/HEAD/bpf_bpfel.o


--------------------------------------------------------------------------------
/proxy_server:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/vinhjaxt/eBPF-sockmap-proxy/HEAD/proxy_server


--------------------------------------------------------------------------------
/go.mod:
--------------------------------------------------------------------------------
1 | module proxy_server
2 | 
3 | go 1.16
4 | 
5 | require (
6 | 	github.com/cilium/ebpf v0.8.2-0.20220302142225-d4100a1f430f
7 | 	golang.org/x/sys v0.0.0-20210906170528-6f6e22806c34
8 | )
9 | 


--------------------------------------------------------------------------------
/headers/update.sh:
--------------------------------------------------------------------------------
 1 | #!/usr/bin/env bash
 2 | 
 3 | # Version of libbpf to fetch headers from
 4 | LIBBPF_VERSION=0.6.1
 5 | 
 6 | # The headers we want
 7 | prefix=libbpf-"$LIBBPF_VERSION"
 8 | headers=(
 9 |     "$prefix"/LICENSE.BSD-2-Clause
10 |     "$prefix"/src/bpf_endian.h
11 |     "$prefix"/src/bpf_helper_defs.h
12 |     "$prefix"/src/bpf_helpers.h
13 |     "$prefix"/src/bpf_tracing.h
14 | )
15 | 
16 | # Fetch libbpf release and extract the desired headers
17 | curl -sL "https://github.com/libbpf/libbpf/archive/refs/tags/v${LIBBPF_VERSION}.tar.gz" | \
18 |     tar -xz --xform='s#.*/#bpf/#' "${headers[@]}"
19 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Proxy Server based on eBPF
 2 | This forward any connection to Go server using eBPF sockmap
 3 | 
 4 | # Commands
 5 | 
 6 | ## Terminal 1
 7 | ```
 8 | go get github.com/cilium/ebpf/cmd/bpf2go@master
 9 | go generate && go build && sudo ./proxy_server
10 | ```
11 | 
12 | ## Terminal 2
13 | ```
14 | sudo cat /sys/kernel/debug/tracing/trace_pipe
15 | ```
16 | 
17 | ## Terminal 3
18 | ```
19 | nc -v 192.168.1.6 777
20 | ```
21 | # CC
22 | * [https://github.com/jsitnicki/ebpf-summit-2020](https://github.com/jsitnicki/ebpf-summit-2020)
23 | * [https://github.com/intel/istio-tcpip-bypass/blob/main/main.go](https://github.com/intel/istio-tcpip-bypass/blob/main/main.go)
24 | # Docs
25 | [https://man7.org/linux/man-pages/man7/bpf-helpers.7.html](https://man7.org/linux/man-pages/man7/bpf-helpers.7.html)
26 | 


--------------------------------------------------------------------------------
/headers/bpf/LICENSE.BSD-2-Clause:
--------------------------------------------------------------------------------
 1 | Valid-License-Identifier: BSD-2-Clause
 2 | SPDX-URL: https://spdx.org/licenses/BSD-2-Clause.html
 3 | Usage-Guide:
 4 |   To use the BSD 2-clause "Simplified" License put the following SPDX
 5 |   tag/value pair into a comment according to the placement guidelines in
 6 |   the licensing rules documentation:
 7 |     SPDX-License-Identifier: BSD-2-Clause
 8 | License-Text:
 9 | 
10 | Copyright (c) <year> <owner> . All rights reserved.
11 | 
12 | Redistribution and use in source and binary forms, with or without
13 | modification, are permitted provided that the following conditions are met:
14 | 
15 | 1. Redistributions of source code must retain the above copyright notice,
16 |    this list of conditions and the following disclaimer.
17 | 
18 | 2. Redistributions in binary form must reproduce the above copyright
19 |    notice, this list of conditions and the following disclaimer in the
20 |    documentation and/or other materials provided with the distribution.
21 | 
22 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
26 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 | POSSIBILITY OF SUCH DAMAGE.
33 | 


--------------------------------------------------------------------------------
/go.sum:
--------------------------------------------------------------------------------
 1 | github.com/cilium/ebpf v0.8.2-0.20220302142225-d4100a1f430f h1:DzeZi0dxa9N76IQPBI82hZxPd3vSylJEwOnryncfkz4=
 2 | github.com/cilium/ebpf v0.8.2-0.20220302142225-d4100a1f430f/go.mod h1:f5zLIM0FSNuAkSyLAN7X+Hy6yznlF1mNiWUMfxMtrgk=
 3 | github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 4 | github.com/frankban/quicktest v1.14.0 h1:+cqqvzZV87b4adx/5ayVOaYZ2CrvM4ejQvUdBzPPUss=
 5 | github.com/frankban/quicktest v1.14.0/go.mod h1:NeW+ay9A/U67EYXNFA1nPE8e/tnQv/09mUdL/ijj8og=
 6 | github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 7 | github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 8 | github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 9 | github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
10 | github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
11 | github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
12 | github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
13 | github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
14 | github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
15 | github.com/rogpeppe/go-internal v1.6.1 h1:/FiVV8dS/e+YqF2JvO3yXRFbBLTIuSDkuC7aBOAvL+k=
16 | github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
17 | golang.org/x/sys v0.0.0-20210906170528-6f6e22806c34 h1:GkvMjFtXUmahfDtashnc1mnrCtuBVcwse5QV2lUk/tI=
18 | golang.org/x/sys v0.0.0-20210906170528-6f6e22806c34/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
19 | golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
20 | golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
21 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
22 | gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
23 | 


--------------------------------------------------------------------------------
/main.go:
--------------------------------------------------------------------------------
  1 | //go:build linux
  2 | // +build linux
  3 | // go get github.com/cilium/ebpf/cmd/bpf2go@master
  4 | //go:generate bpf2go -cc clang-11 -cflags "-g -O2 -Wall -Wextra" bpf proxy_server.c -- -I./headers
  5 | 
  6 | package main
  7 | 
  8 | import (
  9 | 	"io"
 10 | 	"log"
 11 | 	"net"
 12 | 	"os"
 13 | 	"os/signal"
 14 | 	"syscall"
 15 | 
 16 | 	"github.com/cilium/ebpf/link"
 17 | 	"github.com/cilium/ebpf/rlimit"
 18 | )
 19 | 
 20 | // sudo cat  /sys/kernel/debug/tracing/trace_pipe
 21 | func main() {
 22 | 	stopper := make(chan os.Signal, 1)
 23 | 	signal.Notify(stopper, os.Interrupt, syscall.SIGTERM)
 24 | 
 25 | 	// Allow the current process to lock memory for eBPF resources.
 26 | 	if err := rlimit.RemoveMemlock(); err != nil {
 27 | 		log.Panicln(err)
 28 | 	}
 29 | 
 30 | 	// Load pre-compiled programs and maps into the kernel.
 31 | 	objs := bpfObjects{}
 32 | 	err := loadBpfObjects(&objs, nil)
 33 | 	if err != nil {
 34 | 		log.Panicln(err)
 35 | 	}
 36 | 	defer objs.Close()
 37 | 
 38 | 	// Attach program
 39 | 	netns, err := os.Open("/proc/self/ns/net")
 40 | 	if err != nil {
 41 | 		log.Panicln(err)
 42 | 	}
 43 | 	defer netns.Close()
 44 | 
 45 | 	lnk, err := link.AttachNetNs(int(netns.Fd()), objs.bpfPrograms.ProxyDispatch)
 46 | 	defer lnk.Close()
 47 | 	if err != nil {
 48 | 		log.Panicln(err)
 49 | 	}
 50 | 
 51 | 	// Create server
 52 | 	ln, err := net.Listen("tcp", "127.0.0.1:12295")
 53 | 	if err != nil {
 54 | 		log.Panicln(err)
 55 | 	}
 56 | 
 57 | 	go func() {
 58 | 		<-stopper
 59 | 		log.Println("Stoping..")
 60 | 		os.Exit(0)
 61 | 	}()
 62 | 
 63 | 	// Put server fd into map
 64 | 	lnTCP := ln.(*net.TCPListener)
 65 | 	f, err := lnTCP.File()
 66 | 	if err != nil {
 67 | 		log.Panicln(err)
 68 | 	}
 69 | 
 70 | 	err = objs.bpfMaps.ServerSocket.Put(uint32(0), uint64(f.Fd()))
 71 | 	if err != nil {
 72 | 		log.Panicln(err)
 73 | 	}
 74 | 
 75 | 	// Put ports
 76 | 	err = objs.bpfMaps.EchoPorts.Put(uint16(0x0309), uint8(0))
 77 | 	if err != nil {
 78 | 		log.Panicln(err)
 79 | 	}
 80 | 
 81 | 	log.Println("Listening..")
 82 | 	for {
 83 | 		conn, err := ln.Accept()
 84 | 		if err != nil {
 85 | 			log.Println(err)
 86 | 			continue
 87 | 		}
 88 | 		log.Println("New connection", conn.RemoteAddr())
 89 | 		go handleEcho(conn)
 90 | 	}
 91 | 
 92 | }
 93 | 
 94 | // Handle
 95 | func handleEcho(conn net.Conn) {
 96 | 	buf := make([]byte, 1024)
 97 | 	for {
 98 | 		n, err := conn.Read(buf)
 99 | 		if err != nil {
100 | 			if err != io.EOF {
101 | 				log.Println(err)
102 | 			}
103 | 			return
104 | 		}
105 | 		log.Println(string(buf[:n]))
106 | 		conn.Write(buf[:n])
107 | 	}
108 | }
109 | 


--------------------------------------------------------------------------------
/proxy_server.c:
--------------------------------------------------------------------------------
 1 | // +build ignore
 2 | 
 3 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 4 | /* CC: 2020 Cloudflare */
 5 | 
 6 | #include <linux/bpf.h>
 7 | #include <errno.h>
 8 | 
 9 | #include <bpf/bpf_endian.h>
10 | #include <bpf/bpf_helpers.h>
11 | 
12 | /* Declare BPF maps */
13 | 
14 | /* List of open echo service ports. Key is the port number. */
15 | struct bpf_map_def SEC("maps") echo_ports = {
16 | 		.type = BPF_MAP_TYPE_HASH,
17 | 		.max_entries = 1024,
18 | 		.key_size = sizeof(__u16),
19 | 		.value_size = sizeof(__u8),
20 | };
21 | 
22 | /* Server socket */
23 | struct bpf_map_def SEC("maps") server_socket = {
24 | 		.type = BPF_MAP_TYPE_SOCKMAP,
25 | 		.max_entries = 1,
26 | 		.key_size = sizeof(__u32),
27 | 		.value_size = sizeof(__u64),
28 | };
29 | 
30 | /* Dispatcher program for the proxy service */
31 | SEC("sk_lookup/proxy_dispatch")
32 | int proxy_dispatch(struct bpf_sk_lookup *ctx)
33 | {
34 | 	const __u32 zero = 0;
35 | 	struct bpf_sock *sk;
36 | 	__u16 port;
37 | 	__u8 *open;
38 | 	long err;
39 | 
40 | 	/* Is echo service enabled on packets destination port? */
41 | 	port = ctx->local_port;
42 | 	open = bpf_map_lookup_elem(&echo_ports, &port);
43 | 	if (!open)
44 | 		return SK_PASS;
45 | 
46 | 	/* Get echo server socket */
47 | 	sk = bpf_map_lookup_elem(&server_socket, &zero);
48 | 	if (!sk)
49 | 		return SK_DROP;
50 | 
51 | 	/* Dispatch the packet to echo server socket */
52 | 	err = bpf_sk_assign(ctx, sk, 0);
53 | 	bpf_sk_release(sk);
54 | 
55 | 	// https://man7.org/linux/man-pages/man7/bpf-helpers.7.html
56 | 	if (err == -EINVAL)
57 | 	{
58 | 		bpf_printk("bpf_sk_assign: -EINVAL: specified flags are not supported.", err);
59 | 	}
60 | 	else if (err == -ENOENT)
61 | 	{
62 | 		bpf_printk("bpf_sk_assign: -ENOENT: the socket is unavailable for assignment.", err);
63 | 	}
64 | 	else if (err == -ENETUNREACH)
65 | 	{
66 | 		bpf_printk("bpf_sk_assign: -ENETUNREACH: the socket is unreachable (wrong netns).", err);
67 | 	}
68 | 	else if (err == -EOPNOTSUPP)
69 | 	{
70 | 		bpf_printk("bpf_sk_assign: -EOPNOTSUPP: the operation is not supported, for example a call from outside of TC ingress.", err);
71 | 	}
72 | 	else if (err == -ESOCKTNOSUPPORT)
73 | 	{
74 | 		bpf_printk("bpf_sk_assign: -ESOCKTNOSUPPORT if the socket type is not supported (reuseport).", err);
75 | 	}
76 | 
77 | 	// add to key
78 | 
79 | 	return err ? SK_DROP : SK_PASS;
80 | }
81 | 
82 | char LICENSE[] SEC("license") = "Dual MIT/GPL";
83 | // This number will be interpreted by elf-loader to set the current running kernel version
84 | __u32 _version SEC("version") = 0xFFFFFFFE; // NOLINT(bugprone-reserved-identifier)
85 | 


--------------------------------------------------------------------------------
/bpf_bpfeb.go:
--------------------------------------------------------------------------------
  1 | // Code generated by bpf2go; DO NOT EDIT.
  2 | // +build arm64be armbe mips mips64 mips64p32 ppc64 s390 s390x sparc sparc64
  3 | 
  4 | package main
  5 | 
  6 | import (
  7 | 	"bytes"
  8 | 	_ "embed"
  9 | 	"fmt"
 10 | 	"io"
 11 | 
 12 | 	"github.com/cilium/ebpf"
 13 | )
 14 | 
 15 | // loadBpf returns the embedded CollectionSpec for bpf.
 16 | func loadBpf() (*ebpf.CollectionSpec, error) {
 17 | 	reader := bytes.NewReader(_BpfBytes)
 18 | 	spec, err := ebpf.LoadCollectionSpecFromReader(reader)
 19 | 	if err != nil {
 20 | 		return nil, fmt.Errorf("can't load bpf: %w", err)
 21 | 	}
 22 | 
 23 | 	return spec, err
 24 | }
 25 | 
 26 | // loadBpfObjects loads bpf and converts it into a struct.
 27 | //
 28 | // The following types are suitable as obj argument:
 29 | //
 30 | //     *bpfObjects
 31 | //     *bpfPrograms
 32 | //     *bpfMaps
 33 | //
 34 | // See ebpf.CollectionSpec.LoadAndAssign documentation for details.
 35 | func loadBpfObjects(obj interface{}, opts *ebpf.CollectionOptions) error {
 36 | 	spec, err := loadBpf()
 37 | 	if err != nil {
 38 | 		return err
 39 | 	}
 40 | 
 41 | 	return spec.LoadAndAssign(obj, opts)
 42 | }
 43 | 
 44 | // bpfSpecs contains maps and programs before they are loaded into the kernel.
 45 | //
 46 | // It can be passed ebpf.CollectionSpec.Assign.
 47 | type bpfSpecs struct {
 48 | 	bpfProgramSpecs
 49 | 	bpfMapSpecs
 50 | }
 51 | 
 52 | // bpfSpecs contains programs before they are loaded into the kernel.
 53 | //
 54 | // It can be passed ebpf.CollectionSpec.Assign.
 55 | type bpfProgramSpecs struct {
 56 | 	ProxyDispatch *ebpf.ProgramSpec `ebpf:"proxy_dispatch"`
 57 | }
 58 | 
 59 | // bpfMapSpecs contains maps before they are loaded into the kernel.
 60 | //
 61 | // It can be passed ebpf.CollectionSpec.Assign.
 62 | type bpfMapSpecs struct {
 63 | 	EchoPorts    *ebpf.MapSpec `ebpf:"echo_ports"`
 64 | 	ServerSocket *ebpf.MapSpec `ebpf:"server_socket"`
 65 | }
 66 | 
 67 | // bpfObjects contains all objects after they have been loaded into the kernel.
 68 | //
 69 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 70 | type bpfObjects struct {
 71 | 	bpfPrograms
 72 | 	bpfMaps
 73 | }
 74 | 
 75 | func (o *bpfObjects) Close() error {
 76 | 	return _BpfClose(
 77 | 		&o.bpfPrograms,
 78 | 		&o.bpfMaps,
 79 | 	)
 80 | }
 81 | 
 82 | // bpfMaps contains all maps after they have been loaded into the kernel.
 83 | //
 84 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 85 | type bpfMaps struct {
 86 | 	EchoPorts    *ebpf.Map `ebpf:"echo_ports"`
 87 | 	ServerSocket *ebpf.Map `ebpf:"server_socket"`
 88 | }
 89 | 
 90 | func (m *bpfMaps) Close() error {
 91 | 	return _BpfClose(
 92 | 		m.EchoPorts,
 93 | 		m.ServerSocket,
 94 | 	)
 95 | }
 96 | 
 97 | // bpfPrograms contains all programs after they have been loaded into the kernel.
 98 | //
 99 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
100 | type bpfPrograms struct {
101 | 	ProxyDispatch *ebpf.Program `ebpf:"proxy_dispatch"`
102 | }
103 | 
104 | func (p *bpfPrograms) Close() error {
105 | 	return _BpfClose(
106 | 		p.ProxyDispatch,
107 | 	)
108 | }
109 | 
110 | func _BpfClose(closers ...io.Closer) error {
111 | 	for _, closer := range closers {
112 | 		if err := closer.Close(); err != nil {
113 | 			return err
114 | 		}
115 | 	}
116 | 	return nil
117 | }
118 | 
119 | // Do not access this directly.
120 | //go:embed bpf_bpfeb.o
121 | var _BpfBytes []byte
122 | 


--------------------------------------------------------------------------------
/bpf_bpfel.go:
--------------------------------------------------------------------------------
  1 | // Code generated by bpf2go; DO NOT EDIT.
  2 | // +build 386 amd64 amd64p32 arm arm64 mips64le mips64p32le mipsle ppc64le riscv64
  3 | 
  4 | package main
  5 | 
  6 | import (
  7 | 	"bytes"
  8 | 	_ "embed"
  9 | 	"fmt"
 10 | 	"io"
 11 | 
 12 | 	"github.com/cilium/ebpf"
 13 | )
 14 | 
 15 | // loadBpf returns the embedded CollectionSpec for bpf.
 16 | func loadBpf() (*ebpf.CollectionSpec, error) {
 17 | 	reader := bytes.NewReader(_BpfBytes)
 18 | 	spec, err := ebpf.LoadCollectionSpecFromReader(reader)
 19 | 	if err != nil {
 20 | 		return nil, fmt.Errorf("can't load bpf: %w", err)
 21 | 	}
 22 | 
 23 | 	return spec, err
 24 | }
 25 | 
 26 | // loadBpfObjects loads bpf and converts it into a struct.
 27 | //
 28 | // The following types are suitable as obj argument:
 29 | //
 30 | //     *bpfObjects
 31 | //     *bpfPrograms
 32 | //     *bpfMaps
 33 | //
 34 | // See ebpf.CollectionSpec.LoadAndAssign documentation for details.
 35 | func loadBpfObjects(obj interface{}, opts *ebpf.CollectionOptions) error {
 36 | 	spec, err := loadBpf()
 37 | 	if err != nil {
 38 | 		return err
 39 | 	}
 40 | 
 41 | 	return spec.LoadAndAssign(obj, opts)
 42 | }
 43 | 
 44 | // bpfSpecs contains maps and programs before they are loaded into the kernel.
 45 | //
 46 | // It can be passed ebpf.CollectionSpec.Assign.
 47 | type bpfSpecs struct {
 48 | 	bpfProgramSpecs
 49 | 	bpfMapSpecs
 50 | }
 51 | 
 52 | // bpfSpecs contains programs before they are loaded into the kernel.
 53 | //
 54 | // It can be passed ebpf.CollectionSpec.Assign.
 55 | type bpfProgramSpecs struct {
 56 | 	ProxyDispatch *ebpf.ProgramSpec `ebpf:"proxy_dispatch"`
 57 | }
 58 | 
 59 | // bpfMapSpecs contains maps before they are loaded into the kernel.
 60 | //
 61 | // It can be passed ebpf.CollectionSpec.Assign.
 62 | type bpfMapSpecs struct {
 63 | 	EchoPorts    *ebpf.MapSpec `ebpf:"echo_ports"`
 64 | 	ServerSocket *ebpf.MapSpec `ebpf:"server_socket"`
 65 | }
 66 | 
 67 | // bpfObjects contains all objects after they have been loaded into the kernel.
 68 | //
 69 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 70 | type bpfObjects struct {
 71 | 	bpfPrograms
 72 | 	bpfMaps
 73 | }
 74 | 
 75 | func (o *bpfObjects) Close() error {
 76 | 	return _BpfClose(
 77 | 		&o.bpfPrograms,
 78 | 		&o.bpfMaps,
 79 | 	)
 80 | }
 81 | 
 82 | // bpfMaps contains all maps after they have been loaded into the kernel.
 83 | //
 84 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 85 | type bpfMaps struct {
 86 | 	EchoPorts    *ebpf.Map `ebpf:"echo_ports"`
 87 | 	ServerSocket *ebpf.Map `ebpf:"server_socket"`
 88 | }
 89 | 
 90 | func (m *bpfMaps) Close() error {
 91 | 	return _BpfClose(
 92 | 		m.EchoPorts,
 93 | 		m.ServerSocket,
 94 | 	)
 95 | }
 96 | 
 97 | // bpfPrograms contains all programs after they have been loaded into the kernel.
 98 | //
 99 | // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
100 | type bpfPrograms struct {
101 | 	ProxyDispatch *ebpf.Program `ebpf:"proxy_dispatch"`
102 | }
103 | 
104 | func (p *bpfPrograms) Close() error {
105 | 	return _BpfClose(
106 | 		p.ProxyDispatch,
107 | 	)
108 | }
109 | 
110 | func _BpfClose(closers ...io.Closer) error {
111 | 	for _, closer := range closers {
112 | 		if err := closer.Close(); err != nil {
113 | 			return err
114 | 		}
115 | 	}
116 | 	return nil
117 | }
118 | 
119 | // Do not access this directly.
120 | //go:embed bpf_bpfel.o
121 | var _BpfBytes []byte
122 | 


--------------------------------------------------------------------------------
/headers/bpf/bpf_endian.h:
--------------------------------------------------------------------------------
  1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
  2 | #ifndef __BPF_ENDIAN__
  3 | #define __BPF_ENDIAN__
  4 | 
  5 | /*
  6 |  * Isolate byte #n and put it into byte #m, for __u##b type.
  7 |  * E.g., moving byte #6 (nnnnnnnn) into byte #1 (mmmmmmmm) for __u64:
  8 |  * 1) xxxxxxxx nnnnnnnn xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx mmmmmmmm xxxxxxxx
  9 |  * 2) nnnnnnnn xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx mmmmmmmm xxxxxxxx 00000000
 10 |  * 3) 00000000 00000000 00000000 00000000 00000000 00000000 00000000 nnnnnnnn
 11 |  * 4) 00000000 00000000 00000000 00000000 00000000 00000000 nnnnnnnn 00000000
 12 |  */
 13 | #define ___bpf_mvb(x, b, n, m) ((__u##b)(x) << (b-(n+1)*8) >> (b-8) << (m*8))
 14 | 
 15 | #define ___bpf_swab16(x) ((__u16)(			\
 16 | 			  ___bpf_mvb(x, 16, 0, 1) |	\
 17 | 			  ___bpf_mvb(x, 16, 1, 0)))
 18 | 
 19 | #define ___bpf_swab32(x) ((__u32)(			\
 20 | 			  ___bpf_mvb(x, 32, 0, 3) |	\
 21 | 			  ___bpf_mvb(x, 32, 1, 2) |	\
 22 | 			  ___bpf_mvb(x, 32, 2, 1) |	\
 23 | 			  ___bpf_mvb(x, 32, 3, 0)))
 24 | 
 25 | #define ___bpf_swab64(x) ((__u64)(			\
 26 | 			  ___bpf_mvb(x, 64, 0, 7) |	\
 27 | 			  ___bpf_mvb(x, 64, 1, 6) |	\
 28 | 			  ___bpf_mvb(x, 64, 2, 5) |	\
 29 | 			  ___bpf_mvb(x, 64, 3, 4) |	\
 30 | 			  ___bpf_mvb(x, 64, 4, 3) |	\
 31 | 			  ___bpf_mvb(x, 64, 5, 2) |	\
 32 | 			  ___bpf_mvb(x, 64, 6, 1) |	\
 33 | 			  ___bpf_mvb(x, 64, 7, 0)))
 34 | 
 35 | /* LLVM's BPF target selects the endianness of the CPU
 36 |  * it compiles on, or the user specifies (bpfel/bpfeb),
 37 |  * respectively. The used __BYTE_ORDER__ is defined by
 38 |  * the compiler, we cannot rely on __BYTE_ORDER from
 39 |  * libc headers, since it doesn't reflect the actual
 40 |  * requested byte order.
 41 |  *
 42 |  * Note, LLVM's BPF target has different __builtin_bswapX()
 43 |  * semantics. It does map to BPF_ALU | BPF_END | BPF_TO_BE
 44 |  * in bpfel and bpfeb case, which means below, that we map
 45 |  * to cpu_to_be16(). We could use it unconditionally in BPF
 46 |  * case, but better not rely on it, so that this header here
 47 |  * can be used from application and BPF program side, which
 48 |  * use different targets.
 49 |  */
 50 | #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 51 | # define __bpf_ntohs(x)			__builtin_bswap16(x)
 52 | # define __bpf_htons(x)			__builtin_bswap16(x)
 53 | # define __bpf_constant_ntohs(x)	___bpf_swab16(x)
 54 | # define __bpf_constant_htons(x)	___bpf_swab16(x)
 55 | # define __bpf_ntohl(x)			__builtin_bswap32(x)
 56 | # define __bpf_htonl(x)			__builtin_bswap32(x)
 57 | # define __bpf_constant_ntohl(x)	___bpf_swab32(x)
 58 | # define __bpf_constant_htonl(x)	___bpf_swab32(x)
 59 | # define __bpf_be64_to_cpu(x)		__builtin_bswap64(x)
 60 | # define __bpf_cpu_to_be64(x)		__builtin_bswap64(x)
 61 | # define __bpf_constant_be64_to_cpu(x)	___bpf_swab64(x)
 62 | # define __bpf_constant_cpu_to_be64(x)	___bpf_swab64(x)
 63 | #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 64 | # define __bpf_ntohs(x)			(x)
 65 | # define __bpf_htons(x)			(x)
 66 | # define __bpf_constant_ntohs(x)	(x)
 67 | # define __bpf_constant_htons(x)	(x)
 68 | # define __bpf_ntohl(x)			(x)
 69 | # define __bpf_htonl(x)			(x)
 70 | # define __bpf_constant_ntohl(x)	(x)
 71 | # define __bpf_constant_htonl(x)	(x)
 72 | # define __bpf_be64_to_cpu(x)		(x)
 73 | # define __bpf_cpu_to_be64(x)		(x)
 74 | # define __bpf_constant_be64_to_cpu(x)  (x)
 75 | # define __bpf_constant_cpu_to_be64(x)  (x)
 76 | #else
 77 | # error "Fix your compiler's __BYTE_ORDER__?!"
 78 | #endif
 79 | 
 80 | #define bpf_htons(x)				\
 81 | 	(__builtin_constant_p(x) ?		\
 82 | 	 __bpf_constant_htons(x) : __bpf_htons(x))
 83 | #define bpf_ntohs(x)				\
 84 | 	(__builtin_constant_p(x) ?		\
 85 | 	 __bpf_constant_ntohs(x) : __bpf_ntohs(x))
 86 | #define bpf_htonl(x)				\
 87 | 	(__builtin_constant_p(x) ?		\
 88 | 	 __bpf_constant_htonl(x) : __bpf_htonl(x))
 89 | #define bpf_ntohl(x)				\
 90 | 	(__builtin_constant_p(x) ?		\
 91 | 	 __bpf_constant_ntohl(x) : __bpf_ntohl(x))
 92 | #define bpf_cpu_to_be64(x)			\
 93 | 	(__builtin_constant_p(x) ?		\
 94 | 	 __bpf_constant_cpu_to_be64(x) : __bpf_cpu_to_be64(x))
 95 | #define bpf_be64_to_cpu(x)			\
 96 | 	(__builtin_constant_p(x) ?		\
 97 | 	 __bpf_constant_be64_to_cpu(x) : __bpf_be64_to_cpu(x))
 98 | 
 99 | #endif /* __BPF_ENDIAN__ */
100 | 


--------------------------------------------------------------------------------
/main.go.bak:
--------------------------------------------------------------------------------
  1 | //go:build linux
  2 | // +build linux
  3 | // go get github.com/cilium/ebpf/cmd/bpf2go@master
  4 | //go:generate bpf2go -cc clang-11 -cflags "-g -O2 -Wall -Wextra" bpf fentry.c ./linux-5.9.1/tools/lib/bpf/libbpf.a -- -I./linux-5.9.1/usr/include -I./linux-5.9.1/tools/lib -I./headers
  5 | 
  6 | package main
  7 | 
  8 | import (
  9 | 	"log"
 10 | 	"net"
 11 | 	"os"
 12 | 	"os/signal"
 13 | 	"syscall"
 14 | 
 15 | 	"github.com/cilium/ebpf/link"
 16 | 	"github.com/cilium/ebpf/rlimit"
 17 | 	"golang.org/x/sys/unix"
 18 | )
 19 | 
 20 | const (
 21 | 	MapsPinpath = "/sys/fs/bpf/echo_dispatch_prog"
 22 | )
 23 | const ServerAddr = "/tmp/echo_server"
 24 | 
 25 | // sudo cat  /sys/kernel/debug/tracing/trace_pipe
 26 | func main() {
 27 | 	stopper := make(chan os.Signal, 1)
 28 | 	signal.Notify(stopper, os.Interrupt, syscall.SIGTERM)
 29 | 
 30 | 	// Allow the current process to lock memory for eBPF resources.
 31 | 	if err := rlimit.RemoveMemlock(); err != nil {
 32 | 		log.Panicln(err)
 33 | 	}
 34 | 
 35 | 	/*
 36 | 		// Create sockmap
 37 | 		var sockMap *ebpf.Map
 38 | 		sockMap, err := ebpf.NewMap(&ebpf.MapSpec{
 39 | 			Type:       ebpf.MapType(15), // BPF_MAP_TYPE_SOCKMAP
 40 | 			KeySize:    4,
 41 | 			ValueSize:  4,
 42 | 			MaxEntries: 2,
 43 | 		})
 44 | 		if err != nil {
 45 | 			log.Panicln(err)
 46 | 		}
 47 | 		defer sockMap.Close()
 48 | 		// */
 49 | 
 50 | 	// var options ebpf.CollectionOptions
 51 | 
 52 | 	// os.Mkdir(MapsPinpath, os.ModePerm)
 53 | 
 54 | 	// options.Maps.PinPath = MapsPinpath
 55 | 	// objs.bpfMaps.EchoSocket.FD()
 56 | 
 57 | 	// Load pre-compiled programs and maps into the kernel.
 58 | 	objs := bpfObjects{}
 59 | 	// err := loadBpfObjects(&objs, &options)
 60 | 	err := loadBpfObjects(&objs, nil)
 61 | 	if err != nil {
 62 | 		log.Panicln(err)
 63 | 	}
 64 | 	defer objs.Close()
 65 | 
 66 | 	// Attach program
 67 | 	netns, err := os.Open("/proc/self/ns/net")
 68 | 	if err != nil {
 69 | 		log.Panicln(err)
 70 | 	}
 71 | 	defer netns.Close()
 72 | 
 73 | 	lnk, err := link.AttachNetNs(int(netns.Fd()), objs.bpfPrograms.EchoDispatch)
 74 | 	defer lnk.Close()
 75 | 
 76 | 	// err = link.RawAttachProgram(link.RawAttachProgramOptions{
 77 | 	// 	Target:  int(netns.Fd()),
 78 | 	// 	Program: objs.bpfPrograms.EchoDispatch,
 79 | 	// 	Attach:  ebpf.AttachSkLookup,
 80 | 	// 	Flags:  0,
 81 | 	// })
 82 | 	if err != nil {
 83 | 		log.Panicln(err)
 84 | 	}
 85 | 
 86 | 	// Create server
 87 | 
 88 | 	os.Remove(ServerAddr)
 89 | 
 90 | 	ln, err := net.Listen("tcp", "127.0.0.1:8081")
 91 | 	if err != nil {
 92 | 		log.Panicln(err)
 93 | 	}
 94 | 
 95 | 	go func() {
 96 | 		<-stopper
 97 | 		log.Println("Stoping..")
 98 | 		os.Exit(0)
 99 | 	}()
100 | 
101 | 	lnUnix := ln.(*net.TCPListener)
102 | 	f, err := lnUnix.File()
103 | 	if err != nil {
104 | 		log.Panicln(err)
105 | 	}
106 | 
107 | 	log.Println("Fd:", f.Fd())
108 | 
109 | 	log.Println(unix.SetsockoptInt(int(f.Fd()), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1))
110 | 
111 | 	err = objs.bpfMaps.EchoSocket.Put(uint32(0), uint64(f.Fd()))
112 | 	if err != nil {
113 | 		log.Panicln(err)
114 | 	}
115 | 	log.Println("Put done")
116 | 
117 | 	mapIter := objs.bpfMaps.EchoSocket.Iterate()
118 | 	var keyOut1 uint32
119 | 	var valOut1 uint64
120 | 	log.Println(mapIter.Next(&keyOut1, &valOut1))
121 | 	log.Println(keyOut1, valOut1)
122 | 
123 | 	err = objs.bpfMaps.EchoPorts.Put(uint16(0x0309), uint8(0))
124 | 	if err != nil {
125 | 		log.Panicln(err)
126 | 	}
127 | 	log.Println("Put done")
128 | 
129 | 	mapIter = objs.bpfMaps.EchoPorts.Iterate()
130 | 	var keyOut uint16
131 | 	var valOut uint8
132 | 	log.Println(mapIter.Next(&keyOut, &valOut))
133 | 	log.Println(keyOut, valOut)
134 | 
135 | 	// sysConn, err := lnUnix.SyscallConn()
136 | 	// if err != nil {
137 | 	// 	log.Panicln(err)
138 | 	// }
139 | 
140 | 	// log.Println(sysConn)
141 | 
142 | 	log.Println("Accepting..")
143 | 	for {
144 | 		conn, err := ln.Accept()
145 | 		if err != nil {
146 | 			log.Println(err)
147 | 			continue
148 | 		}
149 | 		log.Println("New conn")
150 | 		go handleEcho(conn)
151 | 	}
152 | 
153 | }
154 | 
155 | func handleEcho(conn net.Conn) {
156 | 	buf := make([]byte, 1024)
157 | 	for {
158 | 		n, err := conn.Read(buf)
159 | 		if err != nil {
160 | 			log.Println(err)
161 | 			return
162 | 		}
163 | 		log.Println(string(buf[:n]))
164 | 		conn.Write(buf[:n])
165 | 	}
166 | }
167 | 


--------------------------------------------------------------------------------
/headers/bpf/bpf_helpers.h:
--------------------------------------------------------------------------------
  1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
  2 | #ifndef __BPF_HELPERS__
  3 | #define __BPF_HELPERS__
  4 | 
  5 | /*
  6 |  * Note that bpf programs need to include either
  7 |  * vmlinux.h (auto-generated from BTF) or linux/types.h
  8 |  * in advance since bpf_helper_defs.h uses such types
  9 |  * as __u64.
 10 |  */
 11 | #include "bpf_helper_defs.h"
 12 | 
 13 | #define __uint(name, val) int (*name)[val]
 14 | #define __type(name, val) typeof(val) *name
 15 | #define __array(name, val) typeof(val) *name[]
 16 | 
 17 | /*
 18 |  * Helper macro to place programs, maps, license in
 19 |  * different sections in elf_bpf file. Section names
 20 |  * are interpreted by libbpf depending on the context (BPF programs, BPF maps,
 21 |  * extern variables, etc).
 22 |  * To allow use of SEC() with externs (e.g., for extern .maps declarations),
 23 |  * make sure __attribute__((unused)) doesn't trigger compilation warning.
 24 |  */
 25 | #define SEC(name) \
 26 | 	_Pragma("GCC diagnostic push")					    \
 27 | 	_Pragma("GCC diagnostic ignored \"-Wignored-attributes\"")	    \
 28 | 	__attribute__((section(name), used))				    \
 29 | 	_Pragma("GCC diagnostic pop")					    \
 30 | 
 31 | /* Avoid 'linux/stddef.h' definition of '__always_inline'. */
 32 | #undef __always_inline
 33 | #define __always_inline inline __attribute__((always_inline))
 34 | 
 35 | #ifndef __noinline
 36 | #define __noinline __attribute__((noinline))
 37 | #endif
 38 | #ifndef __weak
 39 | #define __weak __attribute__((weak))
 40 | #endif
 41 | 
 42 | /*
 43 |  * Use __hidden attribute to mark a non-static BPF subprogram effectively
 44 |  * static for BPF verifier's verification algorithm purposes, allowing more
 45 |  * extensive and permissive BPF verification process, taking into account
 46 |  * subprogram's caller context.
 47 |  */
 48 | #define __hidden __attribute__((visibility("hidden")))
 49 | 
 50 | /* When utilizing vmlinux.h with BPF CO-RE, user BPF programs can't include
 51 |  * any system-level headers (such as stddef.h, linux/version.h, etc), and
 52 |  * commonly-used macros like NULL and KERNEL_VERSION aren't available through
 53 |  * vmlinux.h. This just adds unnecessary hurdles and forces users to re-define
 54 |  * them on their own. So as a convenience, provide such definitions here.
 55 |  */
 56 | #ifndef NULL
 57 | #define NULL ((void *)0)
 58 | #endif
 59 | 
 60 | #ifndef KERNEL_VERSION
 61 | #define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + ((c) > 255 ? 255 : (c)))
 62 | #endif
 63 | 
 64 | /*
 65 |  * Helper macros to manipulate data structures
 66 |  */
 67 | #ifndef offsetof
 68 | #define offsetof(TYPE, MEMBER)	((unsigned long)&((TYPE *)0)->MEMBER)
 69 | #endif
 70 | #ifndef container_of
 71 | #define container_of(ptr, type, member)				\
 72 | 	({							\
 73 | 		void *__mptr = (void *)(ptr);			\
 74 | 		((type *)(__mptr - offsetof(type, member)));	\
 75 | 	})
 76 | #endif
 77 | 
 78 | /*
 79 |  * Helper macro to throw a compilation error if __bpf_unreachable() gets
 80 |  * built into the resulting code. This works given BPF back end does not
 81 |  * implement __builtin_trap(). This is useful to assert that certain paths
 82 |  * of the program code are never used and hence eliminated by the compiler.
 83 |  *
 84 |  * For example, consider a switch statement that covers known cases used by
 85 |  * the program. __bpf_unreachable() can then reside in the default case. If
 86 |  * the program gets extended such that a case is not covered in the switch
 87 |  * statement, then it will throw a build error due to the default case not
 88 |  * being compiled out.
 89 |  */
 90 | #ifndef __bpf_unreachable
 91 | # define __bpf_unreachable()	__builtin_trap()
 92 | #endif
 93 | 
 94 | /*
 95 |  * Helper function to perform a tail call with a constant/immediate map slot.
 96 |  */
 97 | #if __clang_major__ >= 8 && defined(__bpf__)
 98 | static __always_inline void
 99 | bpf_tail_call_static(void *ctx, const void *map, const __u32 slot)
100 | {
101 | 	if (!__builtin_constant_p(slot))
102 | 		__bpf_unreachable();
103 | 
104 | 	/*
105 | 	 * Provide a hard guarantee that LLVM won't optimize setting r2 (map
106 | 	 * pointer) and r3 (constant map index) from _different paths_ ending
107 | 	 * up at the _same_ call insn as otherwise we won't be able to use the
108 | 	 * jmpq/nopl retpoline-free patching by the x86-64 JIT in the kernel
109 | 	 * given they mismatch. See also d2e4c1e6c294 ("bpf: Constant map key
110 | 	 * tracking for prog array pokes") for details on verifier tracking.
111 | 	 *
112 | 	 * Note on clobber list: we need to stay in-line with BPF calling
113 | 	 * convention, so even if we don't end up using r0, r4, r5, we need
114 | 	 * to mark them as clobber so that LLVM doesn't end up using them
115 | 	 * before / after the call.
116 | 	 */
117 | 	asm volatile("r1 = %[ctx]\n\t"
118 | 		     "r2 = %[map]\n\t"
119 | 		     "r3 = %[slot]\n\t"
120 | 		     "call 12"
121 | 		     :: [ctx]"r"(ctx), [map]"r"(map), [slot]"i"(slot)
122 | 		     : "r0", "r1", "r2", "r3", "r4", "r5");
123 | }
124 | #endif
125 | 
126 | /*
127 |  * Helper structure used by eBPF C program
128 |  * to describe BPF map attributes to libbpf loader
129 |  */
130 | struct bpf_map_def {
131 | 	unsigned int type;
132 | 	unsigned int key_size;
133 | 	unsigned int value_size;
134 | 	unsigned int max_entries;
135 | 	unsigned int map_flags;
136 | };
137 | 
138 | enum libbpf_pin_type {
139 | 	LIBBPF_PIN_NONE,
140 | 	/* PIN_BY_NAME: pin maps by name (in /sys/fs/bpf by default) */
141 | 	LIBBPF_PIN_BY_NAME,
142 | };
143 | 
144 | enum libbpf_tristate {
145 | 	TRI_NO = 0,
146 | 	TRI_YES = 1,
147 | 	TRI_MODULE = 2,
148 | };
149 | 
150 | #define __kconfig __attribute__((section(".kconfig")))
151 | #define __ksym __attribute__((section(".ksyms")))
152 | 
153 | #ifndef ___bpf_concat
154 | #define ___bpf_concat(a, b) a ## b
155 | #endif
156 | #ifndef ___bpf_apply
157 | #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
158 | #endif
159 | #ifndef ___bpf_nth
160 | #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
161 | #endif
162 | #ifndef ___bpf_narg
163 | #define ___bpf_narg(...) \
164 | 	___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
165 | #endif
166 | 
167 | #define ___bpf_fill0(arr, p, x) do {} while (0)
168 | #define ___bpf_fill1(arr, p, x) arr[p] = x
169 | #define ___bpf_fill2(arr, p, x, args...) arr[p] = x; ___bpf_fill1(arr, p + 1, args)
170 | #define ___bpf_fill3(arr, p, x, args...) arr[p] = x; ___bpf_fill2(arr, p + 1, args)
171 | #define ___bpf_fill4(arr, p, x, args...) arr[p] = x; ___bpf_fill3(arr, p + 1, args)
172 | #define ___bpf_fill5(arr, p, x, args...) arr[p] = x; ___bpf_fill4(arr, p + 1, args)
173 | #define ___bpf_fill6(arr, p, x, args...) arr[p] = x; ___bpf_fill5(arr, p + 1, args)
174 | #define ___bpf_fill7(arr, p, x, args...) arr[p] = x; ___bpf_fill6(arr, p + 1, args)
175 | #define ___bpf_fill8(arr, p, x, args...) arr[p] = x; ___bpf_fill7(arr, p + 1, args)
176 | #define ___bpf_fill9(arr, p, x, args...) arr[p] = x; ___bpf_fill8(arr, p + 1, args)
177 | #define ___bpf_fill10(arr, p, x, args...) arr[p] = x; ___bpf_fill9(arr, p + 1, args)
178 | #define ___bpf_fill11(arr, p, x, args...) arr[p] = x; ___bpf_fill10(arr, p + 1, args)
179 | #define ___bpf_fill12(arr, p, x, args...) arr[p] = x; ___bpf_fill11(arr, p + 1, args)
180 | #define ___bpf_fill(arr, args...) \
181 | 	___bpf_apply(___bpf_fill, ___bpf_narg(args))(arr, 0, args)
182 | 
183 | /*
184 |  * BPF_SEQ_PRINTF to wrap bpf_seq_printf to-be-printed values
185 |  * in a structure.
186 |  */
187 | #define BPF_SEQ_PRINTF(seq, fmt, args...)			\
188 | ({								\
189 | 	static const char ___fmt[] = fmt;			\
190 | 	unsigned long long ___param[___bpf_narg(args)];		\
191 | 								\
192 | 	_Pragma("GCC diagnostic push")				\
193 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")	\
194 | 	___bpf_fill(___param, args);				\
195 | 	_Pragma("GCC diagnostic pop")				\
196 | 								\
197 | 	bpf_seq_printf(seq, ___fmt, sizeof(___fmt),		\
198 | 		       ___param, sizeof(___param));		\
199 | })
200 | 
201 | /*
202 |  * BPF_SNPRINTF wraps the bpf_snprintf helper with variadic arguments instead of
203 |  * an array of u64.
204 |  */
205 | #define BPF_SNPRINTF(out, out_size, fmt, args...)		\
206 | ({								\
207 | 	static const char ___fmt[] = fmt;			\
208 | 	unsigned long long ___param[___bpf_narg(args)];		\
209 | 								\
210 | 	_Pragma("GCC diagnostic push")				\
211 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")	\
212 | 	___bpf_fill(___param, args);				\
213 | 	_Pragma("GCC diagnostic pop")				\
214 | 								\
215 | 	bpf_snprintf(out, out_size, ___fmt,			\
216 | 		     ___param, sizeof(___param));		\
217 | })
218 | 
219 | #ifdef BPF_NO_GLOBAL_DATA
220 | #define BPF_PRINTK_FMT_MOD
221 | #else
222 | #define BPF_PRINTK_FMT_MOD static const
223 | #endif
224 | 
225 | #define __bpf_printk(fmt, ...)				\
226 | ({							\
227 | 	BPF_PRINTK_FMT_MOD char ____fmt[] = fmt;	\
228 | 	bpf_trace_printk(____fmt, sizeof(____fmt),	\
229 | 			 ##__VA_ARGS__);		\
230 | })
231 | 
232 | /*
233 |  * __bpf_vprintk wraps the bpf_trace_vprintk helper with variadic arguments
234 |  * instead of an array of u64.
235 |  */
236 | #define __bpf_vprintk(fmt, args...)				\
237 | ({								\
238 | 	static const char ___fmt[] = fmt;			\
239 | 	unsigned long long ___param[___bpf_narg(args)];		\
240 | 								\
241 | 	_Pragma("GCC diagnostic push")				\
242 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")	\
243 | 	___bpf_fill(___param, args);				\
244 | 	_Pragma("GCC diagnostic pop")				\
245 | 								\
246 | 	bpf_trace_vprintk(___fmt, sizeof(___fmt),		\
247 | 			  ___param, sizeof(___param));		\
248 | })
249 | 
250 | /* Use __bpf_printk when bpf_printk call has 3 or fewer fmt args
251 |  * Otherwise use __bpf_vprintk
252 |  */
253 | #define ___bpf_pick_printk(...) \
254 | 	___bpf_nth(_, ##__VA_ARGS__, __bpf_vprintk, __bpf_vprintk, __bpf_vprintk,	\
255 | 		   __bpf_vprintk, __bpf_vprintk, __bpf_vprintk, __bpf_vprintk,		\
256 | 		   __bpf_vprintk, __bpf_vprintk, __bpf_printk /*3*/, __bpf_printk /*2*/,\
257 | 		   __bpf_printk /*1*/, __bpf_printk /*0*/)
258 | 
259 | /* Helper macro to print out debug messages */
260 | #define bpf_printk(fmt, args...) ___bpf_pick_printk(args)(fmt, ##args)
261 | 
262 | #endif
263 | 


--------------------------------------------------------------------------------
/headers/bpf/bpf_tracing.h:
--------------------------------------------------------------------------------
  1 | /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
  2 | #ifndef __BPF_TRACING_H__
  3 | #define __BPF_TRACING_H__
  4 | 
  5 | /* Scan the ARCH passed in from ARCH env variable (see Makefile) */
  6 | #if defined(__TARGET_ARCH_x86)
  7 | 	#define bpf_target_x86
  8 | 	#define bpf_target_defined
  9 | #elif defined(__TARGET_ARCH_s390)
 10 | 	#define bpf_target_s390
 11 | 	#define bpf_target_defined
 12 | #elif defined(__TARGET_ARCH_arm)
 13 | 	#define bpf_target_arm
 14 | 	#define bpf_target_defined
 15 | #elif defined(__TARGET_ARCH_arm64)
 16 | 	#define bpf_target_arm64
 17 | 	#define bpf_target_defined
 18 | #elif defined(__TARGET_ARCH_mips)
 19 | 	#define bpf_target_mips
 20 | 	#define bpf_target_defined
 21 | #elif defined(__TARGET_ARCH_powerpc)
 22 | 	#define bpf_target_powerpc
 23 | 	#define bpf_target_defined
 24 | #elif defined(__TARGET_ARCH_sparc)
 25 | 	#define bpf_target_sparc
 26 | 	#define bpf_target_defined
 27 | #elif defined(__TARGET_ARCH_riscv)
 28 | 	#define bpf_target_riscv
 29 | 	#define bpf_target_defined
 30 | #else
 31 | 
 32 | /* Fall back to what the compiler says */
 33 | #if defined(__x86_64__)
 34 | 	#define bpf_target_x86
 35 | 	#define bpf_target_defined
 36 | #elif defined(__s390__)
 37 | 	#define bpf_target_s390
 38 | 	#define bpf_target_defined
 39 | #elif defined(__arm__)
 40 | 	#define bpf_target_arm
 41 | 	#define bpf_target_defined
 42 | #elif defined(__aarch64__)
 43 | 	#define bpf_target_arm64
 44 | 	#define bpf_target_defined
 45 | #elif defined(__mips__)
 46 | 	#define bpf_target_mips
 47 | 	#define bpf_target_defined
 48 | #elif defined(__powerpc__)
 49 | 	#define bpf_target_powerpc
 50 | 	#define bpf_target_defined
 51 | #elif defined(__sparc__)
 52 | 	#define bpf_target_sparc
 53 | 	#define bpf_target_defined
 54 | #elif defined(__riscv) && __riscv_xlen == 64
 55 | 	#define bpf_target_riscv
 56 | 	#define bpf_target_defined
 57 | #endif /* no compiler target */
 58 | 
 59 | #endif
 60 | 
 61 | #ifndef __BPF_TARGET_MISSING
 62 | #define __BPF_TARGET_MISSING "GCC error \"Must specify a BPF target arch via __TARGET_ARCH_xxx\""
 63 | #endif
 64 | 
 65 | #if defined(bpf_target_x86)
 66 | 
 67 | #if defined(__KERNEL__) || defined(__VMLINUX_H__)
 68 | 
 69 | #define PT_REGS_PARM1(x) ((x)->di)
 70 | #define PT_REGS_PARM2(x) ((x)->si)
 71 | #define PT_REGS_PARM3(x) ((x)->dx)
 72 | #define PT_REGS_PARM4(x) ((x)->cx)
 73 | #define PT_REGS_PARM5(x) ((x)->r8)
 74 | #define PT_REGS_RET(x) ((x)->sp)
 75 | #define PT_REGS_FP(x) ((x)->bp)
 76 | #define PT_REGS_RC(x) ((x)->ax)
 77 | #define PT_REGS_SP(x) ((x)->sp)
 78 | #define PT_REGS_IP(x) ((x)->ip)
 79 | 
 80 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), di)
 81 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), si)
 82 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), dx)
 83 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), cx)
 84 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
 85 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), sp)
 86 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), bp)
 87 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), ax)
 88 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
 89 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), ip)
 90 | 
 91 | #else
 92 | 
 93 | #ifdef __i386__
 94 | /* i386 kernel is built with -mregparm=3 */
 95 | #define PT_REGS_PARM1(x) ((x)->eax)
 96 | #define PT_REGS_PARM2(x) ((x)->edx)
 97 | #define PT_REGS_PARM3(x) ((x)->ecx)
 98 | #define PT_REGS_PARM4(x) 0
 99 | #define PT_REGS_PARM5(x) 0
100 | #define PT_REGS_RET(x) ((x)->esp)
101 | #define PT_REGS_FP(x) ((x)->ebp)
102 | #define PT_REGS_RC(x) ((x)->eax)
103 | #define PT_REGS_SP(x) ((x)->esp)
104 | #define PT_REGS_IP(x) ((x)->eip)
105 | 
106 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), eax)
107 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), edx)
108 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), ecx)
109 | #define PT_REGS_PARM4_CORE(x) 0
110 | #define PT_REGS_PARM5_CORE(x) 0
111 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), esp)
112 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), ebp)
113 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), eax)
114 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), esp)
115 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), eip)
116 | 
117 | #else
118 | 
119 | #define PT_REGS_PARM1(x) ((x)->rdi)
120 | #define PT_REGS_PARM2(x) ((x)->rsi)
121 | #define PT_REGS_PARM3(x) ((x)->rdx)
122 | #define PT_REGS_PARM4(x) ((x)->rcx)
123 | #define PT_REGS_PARM5(x) ((x)->r8)
124 | #define PT_REGS_RET(x) ((x)->rsp)
125 | #define PT_REGS_FP(x) ((x)->rbp)
126 | #define PT_REGS_RC(x) ((x)->rax)
127 | #define PT_REGS_SP(x) ((x)->rsp)
128 | #define PT_REGS_IP(x) ((x)->rip)
129 | 
130 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), rdi)
131 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), rsi)
132 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), rdx)
133 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), rcx)
134 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), r8)
135 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), rsp)
136 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), rbp)
137 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), rax)
138 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), rsp)
139 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), rip)
140 | 
141 | #endif
142 | #endif
143 | 
144 | #elif defined(bpf_target_s390)
145 | 
146 | /* s390 provides user_pt_regs instead of struct pt_regs to userspace */
147 | struct pt_regs;
148 | #define PT_REGS_S390 const volatile user_pt_regs
149 | #define PT_REGS_PARM1(x) (((PT_REGS_S390 *)(x))->gprs[2])
150 | #define PT_REGS_PARM2(x) (((PT_REGS_S390 *)(x))->gprs[3])
151 | #define PT_REGS_PARM3(x) (((PT_REGS_S390 *)(x))->gprs[4])
152 | #define PT_REGS_PARM4(x) (((PT_REGS_S390 *)(x))->gprs[5])
153 | #define PT_REGS_PARM5(x) (((PT_REGS_S390 *)(x))->gprs[6])
154 | #define PT_REGS_RET(x) (((PT_REGS_S390 *)(x))->gprs[14])
155 | /* Works only with CONFIG_FRAME_POINTER */
156 | #define PT_REGS_FP(x) (((PT_REGS_S390 *)(x))->gprs[11])
157 | #define PT_REGS_RC(x) (((PT_REGS_S390 *)(x))->gprs[2])
158 | #define PT_REGS_SP(x) (((PT_REGS_S390 *)(x))->gprs[15])
159 | #define PT_REGS_IP(x) (((PT_REGS_S390 *)(x))->psw.addr)
160 | 
161 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
162 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[3])
163 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[4])
164 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[5])
165 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[6])
166 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[14])
167 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[11])
168 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[2])
169 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), gprs[15])
170 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_S390 *)(x), psw.addr)
171 | 
172 | #elif defined(bpf_target_arm)
173 | 
174 | #define PT_REGS_PARM1(x) ((x)->uregs[0])
175 | #define PT_REGS_PARM2(x) ((x)->uregs[1])
176 | #define PT_REGS_PARM3(x) ((x)->uregs[2])
177 | #define PT_REGS_PARM4(x) ((x)->uregs[3])
178 | #define PT_REGS_PARM5(x) ((x)->uregs[4])
179 | #define PT_REGS_RET(x) ((x)->uregs[14])
180 | #define PT_REGS_FP(x) ((x)->uregs[11]) /* Works only with CONFIG_FRAME_POINTER */
181 | #define PT_REGS_RC(x) ((x)->uregs[0])
182 | #define PT_REGS_SP(x) ((x)->uregs[13])
183 | #define PT_REGS_IP(x) ((x)->uregs[12])
184 | 
185 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), uregs[0])
186 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), uregs[1])
187 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), uregs[2])
188 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), uregs[3])
189 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), uregs[4])
190 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), uregs[14])
191 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), uregs[11])
192 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), uregs[0])
193 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), uregs[13])
194 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), uregs[12])
195 | 
196 | #elif defined(bpf_target_arm64)
197 | 
198 | /* arm64 provides struct user_pt_regs instead of struct pt_regs to userspace */
199 | struct pt_regs;
200 | #define PT_REGS_ARM64 const volatile struct user_pt_regs
201 | #define PT_REGS_PARM1(x) (((PT_REGS_ARM64 *)(x))->regs[0])
202 | #define PT_REGS_PARM2(x) (((PT_REGS_ARM64 *)(x))->regs[1])
203 | #define PT_REGS_PARM3(x) (((PT_REGS_ARM64 *)(x))->regs[2])
204 | #define PT_REGS_PARM4(x) (((PT_REGS_ARM64 *)(x))->regs[3])
205 | #define PT_REGS_PARM5(x) (((PT_REGS_ARM64 *)(x))->regs[4])
206 | #define PT_REGS_RET(x) (((PT_REGS_ARM64 *)(x))->regs[30])
207 | /* Works only with CONFIG_FRAME_POINTER */
208 | #define PT_REGS_FP(x) (((PT_REGS_ARM64 *)(x))->regs[29])
209 | #define PT_REGS_RC(x) (((PT_REGS_ARM64 *)(x))->regs[0])
210 | #define PT_REGS_SP(x) (((PT_REGS_ARM64 *)(x))->sp)
211 | #define PT_REGS_IP(x) (((PT_REGS_ARM64 *)(x))->pc)
212 | 
213 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
214 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[1])
215 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[2])
216 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[3])
217 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[4])
218 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[30])
219 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[29])
220 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), regs[0])
221 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), sp)
222 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_ARM64 *)(x), pc)
223 | 
224 | #elif defined(bpf_target_mips)
225 | 
226 | #define PT_REGS_PARM1(x) ((x)->regs[4])
227 | #define PT_REGS_PARM2(x) ((x)->regs[5])
228 | #define PT_REGS_PARM3(x) ((x)->regs[6])
229 | #define PT_REGS_PARM4(x) ((x)->regs[7])
230 | #define PT_REGS_PARM5(x) ((x)->regs[8])
231 | #define PT_REGS_RET(x) ((x)->regs[31])
232 | #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
233 | #define PT_REGS_RC(x) ((x)->regs[2])
234 | #define PT_REGS_SP(x) ((x)->regs[29])
235 | #define PT_REGS_IP(x) ((x)->cp0_epc)
236 | 
237 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), regs[4])
238 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), regs[5])
239 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), regs[6])
240 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), regs[7])
241 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), regs[8])
242 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), regs[31])
243 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((x), regs[30])
244 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), regs[2])
245 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), regs[29])
246 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), cp0_epc)
247 | 
248 | #elif defined(bpf_target_powerpc)
249 | 
250 | #define PT_REGS_PARM1(x) ((x)->gpr[3])
251 | #define PT_REGS_PARM2(x) ((x)->gpr[4])
252 | #define PT_REGS_PARM3(x) ((x)->gpr[5])
253 | #define PT_REGS_PARM4(x) ((x)->gpr[6])
254 | #define PT_REGS_PARM5(x) ((x)->gpr[7])
255 | #define PT_REGS_RC(x) ((x)->gpr[3])
256 | #define PT_REGS_SP(x) ((x)->sp)
257 | #define PT_REGS_IP(x) ((x)->nip)
258 | 
259 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), gpr[3])
260 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), gpr[4])
261 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), gpr[5])
262 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), gpr[6])
263 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), gpr[7])
264 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), gpr[3])
265 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), sp)
266 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), nip)
267 | 
268 | #elif defined(bpf_target_sparc)
269 | 
270 | #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
271 | #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
272 | #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
273 | #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
274 | #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
275 | #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
276 | #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
277 | #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
278 | 
279 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
280 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I1])
281 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I2])
282 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I3])
283 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I4])
284 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I7])
285 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((x), u_regs[UREG_I0])
286 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((x), u_regs[UREG_FP])
287 | 
288 | /* Should this also be a bpf_target check for the sparc case? */
289 | #if defined(__arch64__)
290 | #define PT_REGS_IP(x) ((x)->tpc)
291 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), tpc)
292 | #else
293 | #define PT_REGS_IP(x) ((x)->pc)
294 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((x), pc)
295 | #endif
296 | 
297 | #elif defined(bpf_target_riscv)
298 | 
299 | struct pt_regs;
300 | #define PT_REGS_RV const volatile struct user_regs_struct
301 | #define PT_REGS_PARM1(x) (((PT_REGS_RV *)(x))->a0)
302 | #define PT_REGS_PARM2(x) (((PT_REGS_RV *)(x))->a1)
303 | #define PT_REGS_PARM3(x) (((PT_REGS_RV *)(x))->a2)
304 | #define PT_REGS_PARM4(x) (((PT_REGS_RV *)(x))->a3)
305 | #define PT_REGS_PARM5(x) (((PT_REGS_RV *)(x))->a4)
306 | #define PT_REGS_RET(x) (((PT_REGS_RV *)(x))->ra)
307 | #define PT_REGS_FP(x) (((PT_REGS_RV *)(x))->s5)
308 | #define PT_REGS_RC(x) (((PT_REGS_RV *)(x))->a5)
309 | #define PT_REGS_SP(x) (((PT_REGS_RV *)(x))->sp)
310 | #define PT_REGS_IP(x) (((PT_REGS_RV *)(x))->epc)
311 | 
312 | #define PT_REGS_PARM1_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a0)
313 | #define PT_REGS_PARM2_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a1)
314 | #define PT_REGS_PARM3_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a2)
315 | #define PT_REGS_PARM4_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a3)
316 | #define PT_REGS_PARM5_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a4)
317 | #define PT_REGS_RET_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), ra)
318 | #define PT_REGS_FP_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), fp)
319 | #define PT_REGS_RC_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), a5)
320 | #define PT_REGS_SP_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), sp)
321 | #define PT_REGS_IP_CORE(x) BPF_CORE_READ((PT_REGS_RV *)(x), epc)
322 | 
323 | #endif
324 | 
325 | #if defined(bpf_target_powerpc)
326 | #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = (ctx)->link; })
327 | #define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
328 | #elif defined(bpf_target_sparc)
329 | #define BPF_KPROBE_READ_RET_IP(ip, ctx)		({ (ip) = PT_REGS_RET(ctx); })
330 | #define BPF_KRETPROBE_READ_RET_IP		BPF_KPROBE_READ_RET_IP
331 | #elif defined(bpf_target_defined)
332 | #define BPF_KPROBE_READ_RET_IP(ip, ctx)					    \
333 | 	({ bpf_probe_read_kernel(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
334 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx)				    \
335 | 	({ bpf_probe_read_kernel(&(ip), sizeof(ip),			    \
336 | 			  (void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
337 | #endif
338 | 
339 | #if !defined(bpf_target_defined)
340 | 
341 | #define PT_REGS_PARM1(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
342 | #define PT_REGS_PARM2(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
343 | #define PT_REGS_PARM3(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
344 | #define PT_REGS_PARM4(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
345 | #define PT_REGS_PARM5(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
346 | #define PT_REGS_RET(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
347 | #define PT_REGS_FP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
348 | #define PT_REGS_RC(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
349 | #define PT_REGS_SP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
350 | #define PT_REGS_IP(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
351 | 
352 | #define PT_REGS_PARM1_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
353 | #define PT_REGS_PARM2_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
354 | #define PT_REGS_PARM3_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
355 | #define PT_REGS_PARM4_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
356 | #define PT_REGS_PARM5_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
357 | #define PT_REGS_RET_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
358 | #define PT_REGS_FP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
359 | #define PT_REGS_RC_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
360 | #define PT_REGS_SP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
361 | #define PT_REGS_IP_CORE(x) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
362 | 
363 | #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
364 | #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ _Pragma(__BPF_TARGET_MISSING); 0l; })
365 | 
366 | #endif /* !defined(bpf_target_defined) */
367 | 
368 | #ifndef ___bpf_concat
369 | #define ___bpf_concat(a, b) a ## b
370 | #endif
371 | #ifndef ___bpf_apply
372 | #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
373 | #endif
374 | #ifndef ___bpf_nth
375 | #define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
376 | #endif
377 | #ifndef ___bpf_narg
378 | #define ___bpf_narg(...) \
379 | 	___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
380 | #endif
381 | 
382 | #define ___bpf_ctx_cast0() ctx
383 | #define ___bpf_ctx_cast1(x) ___bpf_ctx_cast0(), (void *)ctx[0]
384 | #define ___bpf_ctx_cast2(x, args...) ___bpf_ctx_cast1(args), (void *)ctx[1]
385 | #define ___bpf_ctx_cast3(x, args...) ___bpf_ctx_cast2(args), (void *)ctx[2]
386 | #define ___bpf_ctx_cast4(x, args...) ___bpf_ctx_cast3(args), (void *)ctx[3]
387 | #define ___bpf_ctx_cast5(x, args...) ___bpf_ctx_cast4(args), (void *)ctx[4]
388 | #define ___bpf_ctx_cast6(x, args...) ___bpf_ctx_cast5(args), (void *)ctx[5]
389 | #define ___bpf_ctx_cast7(x, args...) ___bpf_ctx_cast6(args), (void *)ctx[6]
390 | #define ___bpf_ctx_cast8(x, args...) ___bpf_ctx_cast7(args), (void *)ctx[7]
391 | #define ___bpf_ctx_cast9(x, args...) ___bpf_ctx_cast8(args), (void *)ctx[8]
392 | #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
393 | #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
394 | #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
395 | #define ___bpf_ctx_cast(args...) \
396 | 	___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)
397 | 
398 | /*
399 |  * BPF_PROG is a convenience wrapper for generic tp_btf/fentry/fexit and
400 |  * similar kinds of BPF programs, that accept input arguments as a single
401 |  * pointer to untyped u64 array, where each u64 can actually be a typed
402 |  * pointer or integer of different size. Instead of requring user to write
403 |  * manual casts and work with array elements by index, BPF_PROG macro
404 |  * allows user to declare a list of named and typed input arguments in the
405 |  * same syntax as for normal C function. All the casting is hidden and
406 |  * performed transparently, while user code can just assume working with
407 |  * function arguments of specified type and name.
408 |  *
409 |  * Original raw context argument is preserved as well as 'ctx' argument.
410 |  * This is useful when using BPF helpers that expect original context
411 |  * as one of the parameters (e.g., for bpf_perf_event_output()).
412 |  */
413 | #define BPF_PROG(name, args...)						    \
414 | name(unsigned long long *ctx);						    \
415 | static __attribute__((always_inline)) typeof(name(0))			    \
416 | ____##name(unsigned long long *ctx, ##args);				    \
417 | typeof(name(0)) name(unsigned long long *ctx)				    \
418 | {									    \
419 | 	_Pragma("GCC diagnostic push")					    \
420 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
421 | 	return ____##name(___bpf_ctx_cast(args));			    \
422 | 	_Pragma("GCC diagnostic pop")					    \
423 | }									    \
424 | static __attribute__((always_inline)) typeof(name(0))			    \
425 | ____##name(unsigned long long *ctx, ##args)
426 | 
427 | struct pt_regs;
428 | 
429 | #define ___bpf_kprobe_args0() ctx
430 | #define ___bpf_kprobe_args1(x) \
431 | 	___bpf_kprobe_args0(), (void *)PT_REGS_PARM1(ctx)
432 | #define ___bpf_kprobe_args2(x, args...) \
433 | 	___bpf_kprobe_args1(args), (void *)PT_REGS_PARM2(ctx)
434 | #define ___bpf_kprobe_args3(x, args...) \
435 | 	___bpf_kprobe_args2(args), (void *)PT_REGS_PARM3(ctx)
436 | #define ___bpf_kprobe_args4(x, args...) \
437 | 	___bpf_kprobe_args3(args), (void *)PT_REGS_PARM4(ctx)
438 | #define ___bpf_kprobe_args5(x, args...) \
439 | 	___bpf_kprobe_args4(args), (void *)PT_REGS_PARM5(ctx)
440 | #define ___bpf_kprobe_args(args...) \
441 | 	___bpf_apply(___bpf_kprobe_args, ___bpf_narg(args))(args)
442 | 
443 | /*
444 |  * BPF_KPROBE serves the same purpose for kprobes as BPF_PROG for
445 |  * tp_btf/fentry/fexit BPF programs. It hides the underlying platform-specific
446 |  * low-level way of getting kprobe input arguments from struct pt_regs, and
447 |  * provides a familiar typed and named function arguments syntax and
448 |  * semantics of accessing kprobe input paremeters.
449 |  *
450 |  * Original struct pt_regs* context is preserved as 'ctx' argument. This might
451 |  * be necessary when using BPF helpers like bpf_perf_event_output().
452 |  */
453 | #define BPF_KPROBE(name, args...)					    \
454 | name(struct pt_regs *ctx);						    \
455 | static __attribute__((always_inline)) typeof(name(0))			    \
456 | ____##name(struct pt_regs *ctx, ##args);				    \
457 | typeof(name(0)) name(struct pt_regs *ctx)				    \
458 | {									    \
459 | 	_Pragma("GCC diagnostic push")					    \
460 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
461 | 	return ____##name(___bpf_kprobe_args(args));			    \
462 | 	_Pragma("GCC diagnostic pop")					    \
463 | }									    \
464 | static __attribute__((always_inline)) typeof(name(0))			    \
465 | ____##name(struct pt_regs *ctx, ##args)
466 | 
467 | #define ___bpf_kretprobe_args0() ctx
468 | #define ___bpf_kretprobe_args1(x) \
469 | 	___bpf_kretprobe_args0(), (void *)PT_REGS_RC(ctx)
470 | #define ___bpf_kretprobe_args(args...) \
471 | 	___bpf_apply(___bpf_kretprobe_args, ___bpf_narg(args))(args)
472 | 
473 | /*
474 |  * BPF_KRETPROBE is similar to BPF_KPROBE, except, it only provides optional
475 |  * return value (in addition to `struct pt_regs *ctx`), but no input
476 |  * arguments, because they will be clobbered by the time probed function
477 |  * returns.
478 |  */
479 | #define BPF_KRETPROBE(name, args...)					    \
480 | name(struct pt_regs *ctx);						    \
481 | static __attribute__((always_inline)) typeof(name(0))			    \
482 | ____##name(struct pt_regs *ctx, ##args);				    \
483 | typeof(name(0)) name(struct pt_regs *ctx)				    \
484 | {									    \
485 | 	_Pragma("GCC diagnostic push")					    \
486 | 	_Pragma("GCC diagnostic ignored \"-Wint-conversion\"")		    \
487 | 	return ____##name(___bpf_kretprobe_args(args));			    \
488 | 	_Pragma("GCC diagnostic pop")					    \
489 | }									    \
490 | static __always_inline typeof(name(0)) ____##name(struct pt_regs *ctx, ##args)
491 | 
492 | #endif
493 | 


--------------------------------------------------------------------------------
/headers/bpf/bpf_helper_defs.h:
--------------------------------------------------------------------------------
   1 | /* This is auto-generated file. See bpf_doc.py for details. */
   2 | 
   3 | /* Forward declarations of BPF structs */
   4 | struct bpf_fib_lookup;
   5 | struct bpf_sk_lookup;
   6 | struct bpf_perf_event_data;
   7 | struct bpf_perf_event_value;
   8 | struct bpf_pidns_info;
   9 | struct bpf_redir_neigh;
  10 | struct bpf_sock;
  11 | struct bpf_sock_addr;
  12 | struct bpf_sock_ops;
  13 | struct bpf_sock_tuple;
  14 | struct bpf_spin_lock;
  15 | struct bpf_sysctl;
  16 | struct bpf_tcp_sock;
  17 | struct bpf_tunnel_key;
  18 | struct bpf_xfrm_state;
  19 | struct linux_binprm;
  20 | struct pt_regs;
  21 | struct sk_reuseport_md;
  22 | struct sockaddr;
  23 | struct tcphdr;
  24 | struct seq_file;
  25 | struct tcp6_sock;
  26 | struct tcp_sock;
  27 | struct tcp_timewait_sock;
  28 | struct tcp_request_sock;
  29 | struct udp6_sock;
  30 | struct unix_sock;
  31 | struct task_struct;
  32 | struct __sk_buff;
  33 | struct sk_msg_md;
  34 | struct xdp_md;
  35 | struct path;
  36 | struct btf_ptr;
  37 | struct inode;
  38 | struct socket;
  39 | struct file;
  40 | struct bpf_timer;
  41 | 
  42 | /*
  43 |  * bpf_map_lookup_elem
  44 |  *
  45 |  * 	Perform a lookup in *map* for an entry associated to *key*.
  46 |  *
  47 |  * Returns
  48 |  * 	Map value associated to *key*, or **NULL** if no entry was
  49 |  * 	found.
  50 |  */
  51 | static void *(*bpf_map_lookup_elem)(void *map, const void *key) = (void *) 1;
  52 | 
  53 | /*
  54 |  * bpf_map_update_elem
  55 |  *
  56 |  * 	Add or update the value of the entry associated to *key* in
  57 |  * 	*map* with *value*. *flags* is one of:
  58 |  *
  59 |  * 	**BPF_NOEXIST**
  60 |  * 		The entry for *key* must not exist in the map.
  61 |  * 	**BPF_EXIST**
  62 |  * 		The entry for *key* must already exist in the map.
  63 |  * 	**BPF_ANY**
  64 |  * 		No condition on the existence of the entry for *key*.
  65 |  *
  66 |  * 	Flag value **BPF_NOEXIST** cannot be used for maps of types
  67 |  * 	**BPF_MAP_TYPE_ARRAY** or **BPF_MAP_TYPE_PERCPU_ARRAY**  (all
  68 |  * 	elements always exist), the helper would return an error.
  69 |  *
  70 |  * Returns
  71 |  * 	0 on success, or a negative error in case of failure.
  72 |  */
  73 | static long (*bpf_map_update_elem)(void *map, const void *key, const void *value, __u64 flags) = (void *) 2;
  74 | 
  75 | /*
  76 |  * bpf_map_delete_elem
  77 |  *
  78 |  * 	Delete entry with *key* from *map*.
  79 |  *
  80 |  * Returns
  81 |  * 	0 on success, or a negative error in case of failure.
  82 |  */
  83 | static long (*bpf_map_delete_elem)(void *map, const void *key) = (void *) 3;
  84 | 
  85 | /*
  86 |  * bpf_probe_read
  87 |  *
  88 |  * 	For tracing programs, safely attempt to read *size* bytes from
  89 |  * 	kernel space address *unsafe_ptr* and store the data in *dst*.
  90 |  *
  91 |  * 	Generally, use **bpf_probe_read_user**\ () or
  92 |  * 	**bpf_probe_read_kernel**\ () instead.
  93 |  *
  94 |  * Returns
  95 |  * 	0 on success, or a negative error in case of failure.
  96 |  */
  97 | static long (*bpf_probe_read)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 4;
  98 | 
  99 | /*
 100 |  * bpf_ktime_get_ns
 101 |  *
 102 |  * 	Return the time elapsed since system boot, in nanoseconds.
 103 |  * 	Does not include time the system was suspended.
 104 |  * 	See: **clock_gettime**\ (**CLOCK_MONOTONIC**)
 105 |  *
 106 |  * Returns
 107 |  * 	Current *ktime*.
 108 |  */
 109 | static __u64 (*bpf_ktime_get_ns)(void) = (void *) 5;
 110 | 
 111 | /*
 112 |  * bpf_trace_printk
 113 |  *
 114 |  * 	This helper is a "printk()-like" facility for debugging. It
 115 |  * 	prints a message defined by format *fmt* (of size *fmt_size*)
 116 |  * 	to file *\/sys/kernel/debug/tracing/trace* from DebugFS, if
 117 |  * 	available. It can take up to three additional **u64**
 118 |  * 	arguments (as an eBPF helpers, the total number of arguments is
 119 |  * 	limited to five).
 120 |  *
 121 |  * 	Each time the helper is called, it appends a line to the trace.
 122 |  * 	Lines are discarded while *\/sys/kernel/debug/tracing/trace* is
 123 |  * 	open, use *\/sys/kernel/debug/tracing/trace_pipe* to avoid this.
 124 |  * 	The format of the trace is customizable, and the exact output
 125 |  * 	one will get depends on the options set in
 126 |  * 	*\/sys/kernel/debug/tracing/trace_options* (see also the
 127 |  * 	*README* file under the same directory). However, it usually
 128 |  * 	defaults to something like:
 129 |  *
 130 |  * 	::
 131 |  *
 132 |  * 		telnet-470   [001] .N.. 419421.045894: 0x00000001: <formatted msg>
 133 |  *
 134 |  * 	In the above:
 135 |  *
 136 |  * 		* ``telnet`` is the name of the current task.
 137 |  * 		* ``470`` is the PID of the current task.
 138 |  * 		* ``001`` is the CPU number on which the task is
 139 |  * 		  running.
 140 |  * 		* In ``.N..``, each character refers to a set of
 141 |  * 		  options (whether irqs are enabled, scheduling
 142 |  * 		  options, whether hard/softirqs are running, level of
 143 |  * 		  preempt_disabled respectively). **N** means that
 144 |  * 		  **TIF_NEED_RESCHED** and **PREEMPT_NEED_RESCHED**
 145 |  * 		  are set.
 146 |  * 		* ``419421.045894`` is a timestamp.
 147 |  * 		* ``0x00000001`` is a fake value used by BPF for the
 148 |  * 		  instruction pointer register.
 149 |  * 		* ``<formatted msg>`` is the message formatted with
 150 |  * 		  *fmt*.
 151 |  *
 152 |  * 	The conversion specifiers supported by *fmt* are similar, but
 153 |  * 	more limited than for printk(). They are **%d**, **%i**,
 154 |  * 	**%u**, **%x**, **%ld**, **%li**, **%lu**, **%lx**, **%lld**,
 155 |  * 	**%lli**, **%llu**, **%llx**, **%p**, **%s**. No modifier (size
 156 |  * 	of field, padding with zeroes, etc.) is available, and the
 157 |  * 	helper will return **-EINVAL** (but print nothing) if it
 158 |  * 	encounters an unknown specifier.
 159 |  *
 160 |  * 	Also, note that **bpf_trace_printk**\ () is slow, and should
 161 |  * 	only be used for debugging purposes. For this reason, a notice
 162 |  * 	block (spanning several lines) is printed to kernel logs and
 163 |  * 	states that the helper should not be used "for production use"
 164 |  * 	the first time this helper is used (or more precisely, when
 165 |  * 	**trace_printk**\ () buffers are allocated). For passing values
 166 |  * 	to user space, perf events should be preferred.
 167 |  *
 168 |  * Returns
 169 |  * 	The number of bytes written to the buffer, or a negative error
 170 |  * 	in case of failure.
 171 |  */
 172 | static long (*bpf_trace_printk)(const char *fmt, __u32 fmt_size, ...) = (void *) 6;
 173 | 
 174 | /*
 175 |  * bpf_get_prandom_u32
 176 |  *
 177 |  * 	Get a pseudo-random number.
 178 |  *
 179 |  * 	From a security point of view, this helper uses its own
 180 |  * 	pseudo-random internal state, and cannot be used to infer the
 181 |  * 	seed of other random functions in the kernel. However, it is
 182 |  * 	essential to note that the generator used by the helper is not
 183 |  * 	cryptographically secure.
 184 |  *
 185 |  * Returns
 186 |  * 	A random 32-bit unsigned value.
 187 |  */
 188 | static __u32 (*bpf_get_prandom_u32)(void) = (void *) 7;
 189 | 
 190 | /*
 191 |  * bpf_get_smp_processor_id
 192 |  *
 193 |  * 	Get the SMP (symmetric multiprocessing) processor id. Note that
 194 |  * 	all programs run with migration disabled, which means that the
 195 |  * 	SMP processor id is stable during all the execution of the
 196 |  * 	program.
 197 |  *
 198 |  * Returns
 199 |  * 	The SMP id of the processor running the program.
 200 |  */
 201 | static __u32 (*bpf_get_smp_processor_id)(void) = (void *) 8;
 202 | 
 203 | /*
 204 |  * bpf_skb_store_bytes
 205 |  *
 206 |  * 	Store *len* bytes from address *from* into the packet
 207 |  * 	associated to *skb*, at *offset*. *flags* are a combination of
 208 |  * 	**BPF_F_RECOMPUTE_CSUM** (automatically recompute the
 209 |  * 	checksum for the packet after storing the bytes) and
 210 |  * 	**BPF_F_INVALIDATE_HASH** (set *skb*\ **->hash**, *skb*\
 211 |  * 	**->swhash** and *skb*\ **->l4hash** to 0).
 212 |  *
 213 |  * 	A call to this helper is susceptible to change the underlying
 214 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 215 |  * 	previously done by the verifier are invalidated and must be
 216 |  * 	performed again, if the helper is used in combination with
 217 |  * 	direct packet access.
 218 |  *
 219 |  * Returns
 220 |  * 	0 on success, or a negative error in case of failure.
 221 |  */
 222 | static long (*bpf_skb_store_bytes)(struct __sk_buff *skb, __u32 offset, const void *from, __u32 len, __u64 flags) = (void *) 9;
 223 | 
 224 | /*
 225 |  * bpf_l3_csum_replace
 226 |  *
 227 |  * 	Recompute the layer 3 (e.g. IP) checksum for the packet
 228 |  * 	associated to *skb*. Computation is incremental, so the helper
 229 |  * 	must know the former value of the header field that was
 230 |  * 	modified (*from*), the new value of this field (*to*), and the
 231 |  * 	number of bytes (2 or 4) for this field, stored in *size*.
 232 |  * 	Alternatively, it is possible to store the difference between
 233 |  * 	the previous and the new values of the header field in *to*, by
 234 |  * 	setting *from* and *size* to 0. For both methods, *offset*
 235 |  * 	indicates the location of the IP checksum within the packet.
 236 |  *
 237 |  * 	This helper works in combination with **bpf_csum_diff**\ (),
 238 |  * 	which does not update the checksum in-place, but offers more
 239 |  * 	flexibility and can handle sizes larger than 2 or 4 for the
 240 |  * 	checksum to update.
 241 |  *
 242 |  * 	A call to this helper is susceptible to change the underlying
 243 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 244 |  * 	previously done by the verifier are invalidated and must be
 245 |  * 	performed again, if the helper is used in combination with
 246 |  * 	direct packet access.
 247 |  *
 248 |  * Returns
 249 |  * 	0 on success, or a negative error in case of failure.
 250 |  */
 251 | static long (*bpf_l3_csum_replace)(struct __sk_buff *skb, __u32 offset, __u64 from, __u64 to, __u64 size) = (void *) 10;
 252 | 
 253 | /*
 254 |  * bpf_l4_csum_replace
 255 |  *
 256 |  * 	Recompute the layer 4 (e.g. TCP, UDP or ICMP) checksum for the
 257 |  * 	packet associated to *skb*. Computation is incremental, so the
 258 |  * 	helper must know the former value of the header field that was
 259 |  * 	modified (*from*), the new value of this field (*to*), and the
 260 |  * 	number of bytes (2 or 4) for this field, stored on the lowest
 261 |  * 	four bits of *flags*. Alternatively, it is possible to store
 262 |  * 	the difference between the previous and the new values of the
 263 |  * 	header field in *to*, by setting *from* and the four lowest
 264 |  * 	bits of *flags* to 0. For both methods, *offset* indicates the
 265 |  * 	location of the IP checksum within the packet. In addition to
 266 |  * 	the size of the field, *flags* can be added (bitwise OR) actual
 267 |  * 	flags. With **BPF_F_MARK_MANGLED_0**, a null checksum is left
 268 |  * 	untouched (unless **BPF_F_MARK_ENFORCE** is added as well), and
 269 |  * 	for updates resulting in a null checksum the value is set to
 270 |  * 	**CSUM_MANGLED_0** instead. Flag **BPF_F_PSEUDO_HDR** indicates
 271 |  * 	the checksum is to be computed against a pseudo-header.
 272 |  *
 273 |  * 	This helper works in combination with **bpf_csum_diff**\ (),
 274 |  * 	which does not update the checksum in-place, but offers more
 275 |  * 	flexibility and can handle sizes larger than 2 or 4 for the
 276 |  * 	checksum to update.
 277 |  *
 278 |  * 	A call to this helper is susceptible to change the underlying
 279 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 280 |  * 	previously done by the verifier are invalidated and must be
 281 |  * 	performed again, if the helper is used in combination with
 282 |  * 	direct packet access.
 283 |  *
 284 |  * Returns
 285 |  * 	0 on success, or a negative error in case of failure.
 286 |  */
 287 | static long (*bpf_l4_csum_replace)(struct __sk_buff *skb, __u32 offset, __u64 from, __u64 to, __u64 flags) = (void *) 11;
 288 | 
 289 | /*
 290 |  * bpf_tail_call
 291 |  *
 292 |  * 	This special helper is used to trigger a "tail call", or in
 293 |  * 	other words, to jump into another eBPF program. The same stack
 294 |  * 	frame is used (but values on stack and in registers for the
 295 |  * 	caller are not accessible to the callee). This mechanism allows
 296 |  * 	for program chaining, either for raising the maximum number of
 297 |  * 	available eBPF instructions, or to execute given programs in
 298 |  * 	conditional blocks. For security reasons, there is an upper
 299 |  * 	limit to the number of successive tail calls that can be
 300 |  * 	performed.
 301 |  *
 302 |  * 	Upon call of this helper, the program attempts to jump into a
 303 |  * 	program referenced at index *index* in *prog_array_map*, a
 304 |  * 	special map of type **BPF_MAP_TYPE_PROG_ARRAY**, and passes
 305 |  * 	*ctx*, a pointer to the context.
 306 |  *
 307 |  * 	If the call succeeds, the kernel immediately runs the first
 308 |  * 	instruction of the new program. This is not a function call,
 309 |  * 	and it never returns to the previous program. If the call
 310 |  * 	fails, then the helper has no effect, and the caller continues
 311 |  * 	to run its subsequent instructions. A call can fail if the
 312 |  * 	destination program for the jump does not exist (i.e. *index*
 313 |  * 	is superior to the number of entries in *prog_array_map*), or
 314 |  * 	if the maximum number of tail calls has been reached for this
 315 |  * 	chain of programs. This limit is defined in the kernel by the
 316 |  * 	macro **MAX_TAIL_CALL_CNT** (not accessible to user space),
 317 |  * 	which is currently set to 33.
 318 |  *
 319 |  * Returns
 320 |  * 	0 on success, or a negative error in case of failure.
 321 |  */
 322 | static long (*bpf_tail_call)(void *ctx, void *prog_array_map, __u32 index) = (void *) 12;
 323 | 
 324 | /*
 325 |  * bpf_clone_redirect
 326 |  *
 327 |  * 	Clone and redirect the packet associated to *skb* to another
 328 |  * 	net device of index *ifindex*. Both ingress and egress
 329 |  * 	interfaces can be used for redirection. The **BPF_F_INGRESS**
 330 |  * 	value in *flags* is used to make the distinction (ingress path
 331 |  * 	is selected if the flag is present, egress path otherwise).
 332 |  * 	This is the only flag supported for now.
 333 |  *
 334 |  * 	In comparison with **bpf_redirect**\ () helper,
 335 |  * 	**bpf_clone_redirect**\ () has the associated cost of
 336 |  * 	duplicating the packet buffer, but this can be executed out of
 337 |  * 	the eBPF program. Conversely, **bpf_redirect**\ () is more
 338 |  * 	efficient, but it is handled through an action code where the
 339 |  * 	redirection happens only after the eBPF program has returned.
 340 |  *
 341 |  * 	A call to this helper is susceptible to change the underlying
 342 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 343 |  * 	previously done by the verifier are invalidated and must be
 344 |  * 	performed again, if the helper is used in combination with
 345 |  * 	direct packet access.
 346 |  *
 347 |  * Returns
 348 |  * 	0 on success, or a negative error in case of failure.
 349 |  */
 350 | static long (*bpf_clone_redirect)(struct __sk_buff *skb, __u32 ifindex, __u64 flags) = (void *) 13;
 351 | 
 352 | /*
 353 |  * bpf_get_current_pid_tgid
 354 |  *
 355 |  *
 356 |  * Returns
 357 |  * 	A 64-bit integer containing the current tgid and pid, and
 358 |  * 	created as such:
 359 |  * 	*current_task*\ **->tgid << 32 \|**
 360 |  * 	*current_task*\ **->pid**.
 361 |  */
 362 | static __u64 (*bpf_get_current_pid_tgid)(void) = (void *) 14;
 363 | 
 364 | /*
 365 |  * bpf_get_current_uid_gid
 366 |  *
 367 |  *
 368 |  * Returns
 369 |  * 	A 64-bit integer containing the current GID and UID, and
 370 |  * 	created as such: *current_gid* **<< 32 \|** *current_uid*.
 371 |  */
 372 | static __u64 (*bpf_get_current_uid_gid)(void) = (void *) 15;
 373 | 
 374 | /*
 375 |  * bpf_get_current_comm
 376 |  *
 377 |  * 	Copy the **comm** attribute of the current task into *buf* of
 378 |  * 	*size_of_buf*. The **comm** attribute contains the name of
 379 |  * 	the executable (excluding the path) for the current task. The
 380 |  * 	*size_of_buf* must be strictly positive. On success, the
 381 |  * 	helper makes sure that the *buf* is NUL-terminated. On failure,
 382 |  * 	it is filled with zeroes.
 383 |  *
 384 |  * Returns
 385 |  * 	0 on success, or a negative error in case of failure.
 386 |  */
 387 | static long (*bpf_get_current_comm)(void *buf, __u32 size_of_buf) = (void *) 16;
 388 | 
 389 | /*
 390 |  * bpf_get_cgroup_classid
 391 |  *
 392 |  * 	Retrieve the classid for the current task, i.e. for the net_cls
 393 |  * 	cgroup to which *skb* belongs.
 394 |  *
 395 |  * 	This helper can be used on TC egress path, but not on ingress.
 396 |  *
 397 |  * 	The net_cls cgroup provides an interface to tag network packets
 398 |  * 	based on a user-provided identifier for all traffic coming from
 399 |  * 	the tasks belonging to the related cgroup. See also the related
 400 |  * 	kernel documentation, available from the Linux sources in file
 401 |  * 	*Documentation/admin-guide/cgroup-v1/net_cls.rst*.
 402 |  *
 403 |  * 	The Linux kernel has two versions for cgroups: there are
 404 |  * 	cgroups v1 and cgroups v2. Both are available to users, who can
 405 |  * 	use a mixture of them, but note that the net_cls cgroup is for
 406 |  * 	cgroup v1 only. This makes it incompatible with BPF programs
 407 |  * 	run on cgroups, which is a cgroup-v2-only feature (a socket can
 408 |  * 	only hold data for one version of cgroups at a time).
 409 |  *
 410 |  * 	This helper is only available is the kernel was compiled with
 411 |  * 	the **CONFIG_CGROUP_NET_CLASSID** configuration option set to
 412 |  * 	"**y**" or to "**m**".
 413 |  *
 414 |  * Returns
 415 |  * 	The classid, or 0 for the default unconfigured classid.
 416 |  */
 417 | static __u32 (*bpf_get_cgroup_classid)(struct __sk_buff *skb) = (void *) 17;
 418 | 
 419 | /*
 420 |  * bpf_skb_vlan_push
 421 |  *
 422 |  * 	Push a *vlan_tci* (VLAN tag control information) of protocol
 423 |  * 	*vlan_proto* to the packet associated to *skb*, then update
 424 |  * 	the checksum. Note that if *vlan_proto* is different from
 425 |  * 	**ETH_P_8021Q** and **ETH_P_8021AD**, it is considered to
 426 |  * 	be **ETH_P_8021Q**.
 427 |  *
 428 |  * 	A call to this helper is susceptible to change the underlying
 429 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 430 |  * 	previously done by the verifier are invalidated and must be
 431 |  * 	performed again, if the helper is used in combination with
 432 |  * 	direct packet access.
 433 |  *
 434 |  * Returns
 435 |  * 	0 on success, or a negative error in case of failure.
 436 |  */
 437 | static long (*bpf_skb_vlan_push)(struct __sk_buff *skb, __be16 vlan_proto, __u16 vlan_tci) = (void *) 18;
 438 | 
 439 | /*
 440 |  * bpf_skb_vlan_pop
 441 |  *
 442 |  * 	Pop a VLAN header from the packet associated to *skb*.
 443 |  *
 444 |  * 	A call to this helper is susceptible to change the underlying
 445 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 446 |  * 	previously done by the verifier are invalidated and must be
 447 |  * 	performed again, if the helper is used in combination with
 448 |  * 	direct packet access.
 449 |  *
 450 |  * Returns
 451 |  * 	0 on success, or a negative error in case of failure.
 452 |  */
 453 | static long (*bpf_skb_vlan_pop)(struct __sk_buff *skb) = (void *) 19;
 454 | 
 455 | /*
 456 |  * bpf_skb_get_tunnel_key
 457 |  *
 458 |  * 	Get tunnel metadata. This helper takes a pointer *key* to an
 459 |  * 	empty **struct bpf_tunnel_key** of **size**, that will be
 460 |  * 	filled with tunnel metadata for the packet associated to *skb*.
 461 |  * 	The *flags* can be set to **BPF_F_TUNINFO_IPV6**, which
 462 |  * 	indicates that the tunnel is based on IPv6 protocol instead of
 463 |  * 	IPv4.
 464 |  *
 465 |  * 	The **struct bpf_tunnel_key** is an object that generalizes the
 466 |  * 	principal parameters used by various tunneling protocols into a
 467 |  * 	single struct. This way, it can be used to easily make a
 468 |  * 	decision based on the contents of the encapsulation header,
 469 |  * 	"summarized" in this struct. In particular, it holds the IP
 470 |  * 	address of the remote end (IPv4 or IPv6, depending on the case)
 471 |  * 	in *key*\ **->remote_ipv4** or *key*\ **->remote_ipv6**. Also,
 472 |  * 	this struct exposes the *key*\ **->tunnel_id**, which is
 473 |  * 	generally mapped to a VNI (Virtual Network Identifier), making
 474 |  * 	it programmable together with the **bpf_skb_set_tunnel_key**\
 475 |  * 	() helper.
 476 |  *
 477 |  * 	Let's imagine that the following code is part of a program
 478 |  * 	attached to the TC ingress interface, on one end of a GRE
 479 |  * 	tunnel, and is supposed to filter out all messages coming from
 480 |  * 	remote ends with IPv4 address other than 10.0.0.1:
 481 |  *
 482 |  * 	::
 483 |  *
 484 |  * 		int ret;
 485 |  * 		struct bpf_tunnel_key key = {};
 486 |  *
 487 |  * 		ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
 488 |  * 		if (ret < 0)
 489 |  * 			return TC_ACT_SHOT;	// drop packet
 490 |  *
 491 |  * 		if (key.remote_ipv4 != 0x0a000001)
 492 |  * 			return TC_ACT_SHOT;	// drop packet
 493 |  *
 494 |  * 		return TC_ACT_OK;		// accept packet
 495 |  *
 496 |  * 	This interface can also be used with all encapsulation devices
 497 |  * 	that can operate in "collect metadata" mode: instead of having
 498 |  * 	one network device per specific configuration, the "collect
 499 |  * 	metadata" mode only requires a single device where the
 500 |  * 	configuration can be extracted from this helper.
 501 |  *
 502 |  * 	This can be used together with various tunnels such as VXLan,
 503 |  * 	Geneve, GRE or IP in IP (IPIP).
 504 |  *
 505 |  * Returns
 506 |  * 	0 on success, or a negative error in case of failure.
 507 |  */
 508 | static long (*bpf_skb_get_tunnel_key)(struct __sk_buff *skb, struct bpf_tunnel_key *key, __u32 size, __u64 flags) = (void *) 20;
 509 | 
 510 | /*
 511 |  * bpf_skb_set_tunnel_key
 512 |  *
 513 |  * 	Populate tunnel metadata for packet associated to *skb.* The
 514 |  * 	tunnel metadata is set to the contents of *key*, of *size*. The
 515 |  * 	*flags* can be set to a combination of the following values:
 516 |  *
 517 |  * 	**BPF_F_TUNINFO_IPV6**
 518 |  * 		Indicate that the tunnel is based on IPv6 protocol
 519 |  * 		instead of IPv4.
 520 |  * 	**BPF_F_ZERO_CSUM_TX**
 521 |  * 		For IPv4 packets, add a flag to tunnel metadata
 522 |  * 		indicating that checksum computation should be skipped
 523 |  * 		and checksum set to zeroes.
 524 |  * 	**BPF_F_DONT_FRAGMENT**
 525 |  * 		Add a flag to tunnel metadata indicating that the
 526 |  * 		packet should not be fragmented.
 527 |  * 	**BPF_F_SEQ_NUMBER**
 528 |  * 		Add a flag to tunnel metadata indicating that a
 529 |  * 		sequence number should be added to tunnel header before
 530 |  * 		sending the packet. This flag was added for GRE
 531 |  * 		encapsulation, but might be used with other protocols
 532 |  * 		as well in the future.
 533 |  *
 534 |  * 	Here is a typical usage on the transmit path:
 535 |  *
 536 |  * 	::
 537 |  *
 538 |  * 		struct bpf_tunnel_key key;
 539 |  * 		     populate key ...
 540 |  * 		bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0);
 541 |  * 		bpf_clone_redirect(skb, vxlan_dev_ifindex, 0);
 542 |  *
 543 |  * 	See also the description of the **bpf_skb_get_tunnel_key**\ ()
 544 |  * 	helper for additional information.
 545 |  *
 546 |  * Returns
 547 |  * 	0 on success, or a negative error in case of failure.
 548 |  */
 549 | static long (*bpf_skb_set_tunnel_key)(struct __sk_buff *skb, struct bpf_tunnel_key *key, __u32 size, __u64 flags) = (void *) 21;
 550 | 
 551 | /*
 552 |  * bpf_perf_event_read
 553 |  *
 554 |  * 	Read the value of a perf event counter. This helper relies on a
 555 |  * 	*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. The nature of
 556 |  * 	the perf event counter is selected when *map* is updated with
 557 |  * 	perf event file descriptors. The *map* is an array whose size
 558 |  * 	is the number of available CPUs, and each cell contains a value
 559 |  * 	relative to one CPU. The value to retrieve is indicated by
 560 |  * 	*flags*, that contains the index of the CPU to look up, masked
 561 |  * 	with **BPF_F_INDEX_MASK**. Alternatively, *flags* can be set to
 562 |  * 	**BPF_F_CURRENT_CPU** to indicate that the value for the
 563 |  * 	current CPU should be retrieved.
 564 |  *
 565 |  * 	Note that before Linux 4.13, only hardware perf event can be
 566 |  * 	retrieved.
 567 |  *
 568 |  * 	Also, be aware that the newer helper
 569 |  * 	**bpf_perf_event_read_value**\ () is recommended over
 570 |  * 	**bpf_perf_event_read**\ () in general. The latter has some ABI
 571 |  * 	quirks where error and counter value are used as a return code
 572 |  * 	(which is wrong to do since ranges may overlap). This issue is
 573 |  * 	fixed with **bpf_perf_event_read_value**\ (), which at the same
 574 |  * 	time provides more features over the **bpf_perf_event_read**\
 575 |  * 	() interface. Please refer to the description of
 576 |  * 	**bpf_perf_event_read_value**\ () for details.
 577 |  *
 578 |  * Returns
 579 |  * 	The value of the perf event counter read from the map, or a
 580 |  * 	negative error code in case of failure.
 581 |  */
 582 | static __u64 (*bpf_perf_event_read)(void *map, __u64 flags) = (void *) 22;
 583 | 
 584 | /*
 585 |  * bpf_redirect
 586 |  *
 587 |  * 	Redirect the packet to another net device of index *ifindex*.
 588 |  * 	This helper is somewhat similar to **bpf_clone_redirect**\
 589 |  * 	(), except that the packet is not cloned, which provides
 590 |  * 	increased performance.
 591 |  *
 592 |  * 	Except for XDP, both ingress and egress interfaces can be used
 593 |  * 	for redirection. The **BPF_F_INGRESS** value in *flags* is used
 594 |  * 	to make the distinction (ingress path is selected if the flag
 595 |  * 	is present, egress path otherwise). Currently, XDP only
 596 |  * 	supports redirection to the egress interface, and accepts no
 597 |  * 	flag at all.
 598 |  *
 599 |  * 	The same effect can also be attained with the more generic
 600 |  * 	**bpf_redirect_map**\ (), which uses a BPF map to store the
 601 |  * 	redirect target instead of providing it directly to the helper.
 602 |  *
 603 |  * Returns
 604 |  * 	For XDP, the helper returns **XDP_REDIRECT** on success or
 605 |  * 	**XDP_ABORTED** on error. For other program types, the values
 606 |  * 	are **TC_ACT_REDIRECT** on success or **TC_ACT_SHOT** on
 607 |  * 	error.
 608 |  */
 609 | static long (*bpf_redirect)(__u32 ifindex, __u64 flags) = (void *) 23;
 610 | 
 611 | /*
 612 |  * bpf_get_route_realm
 613 |  *
 614 |  * 	Retrieve the realm or the route, that is to say the
 615 |  * 	**tclassid** field of the destination for the *skb*. The
 616 |  * 	identifier retrieved is a user-provided tag, similar to the
 617 |  * 	one used with the net_cls cgroup (see description for
 618 |  * 	**bpf_get_cgroup_classid**\ () helper), but here this tag is
 619 |  * 	held by a route (a destination entry), not by a task.
 620 |  *
 621 |  * 	Retrieving this identifier works with the clsact TC egress hook
 622 |  * 	(see also **tc-bpf(8)**), or alternatively on conventional
 623 |  * 	classful egress qdiscs, but not on TC ingress path. In case of
 624 |  * 	clsact TC egress hook, this has the advantage that, internally,
 625 |  * 	the destination entry has not been dropped yet in the transmit
 626 |  * 	path. Therefore, the destination entry does not need to be
 627 |  * 	artificially held via **netif_keep_dst**\ () for a classful
 628 |  * 	qdisc until the *skb* is freed.
 629 |  *
 630 |  * 	This helper is available only if the kernel was compiled with
 631 |  * 	**CONFIG_IP_ROUTE_CLASSID** configuration option.
 632 |  *
 633 |  * Returns
 634 |  * 	The realm of the route for the packet associated to *skb*, or 0
 635 |  * 	if none was found.
 636 |  */
 637 | static __u32 (*bpf_get_route_realm)(struct __sk_buff *skb) = (void *) 24;
 638 | 
 639 | /*
 640 |  * bpf_perf_event_output
 641 |  *
 642 |  * 	Write raw *data* blob into a special BPF perf event held by
 643 |  * 	*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
 644 |  * 	event must have the following attributes: **PERF_SAMPLE_RAW**
 645 |  * 	as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
 646 |  * 	**PERF_COUNT_SW_BPF_OUTPUT** as **config**.
 647 |  *
 648 |  * 	The *flags* are used to indicate the index in *map* for which
 649 |  * 	the value must be put, masked with **BPF_F_INDEX_MASK**.
 650 |  * 	Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
 651 |  * 	to indicate that the index of the current CPU core should be
 652 |  * 	used.
 653 |  *
 654 |  * 	The value to write, of *size*, is passed through eBPF stack and
 655 |  * 	pointed by *data*.
 656 |  *
 657 |  * 	The context of the program *ctx* needs also be passed to the
 658 |  * 	helper.
 659 |  *
 660 |  * 	On user space, a program willing to read the values needs to
 661 |  * 	call **perf_event_open**\ () on the perf event (either for
 662 |  * 	one or for all CPUs) and to store the file descriptor into the
 663 |  * 	*map*. This must be done before the eBPF program can send data
 664 |  * 	into it. An example is available in file
 665 |  * 	*samples/bpf/trace_output_user.c* in the Linux kernel source
 666 |  * 	tree (the eBPF program counterpart is in
 667 |  * 	*samples/bpf/trace_output_kern.c*).
 668 |  *
 669 |  * 	**bpf_perf_event_output**\ () achieves better performance
 670 |  * 	than **bpf_trace_printk**\ () for sharing data with user
 671 |  * 	space, and is much better suitable for streaming data from eBPF
 672 |  * 	programs.
 673 |  *
 674 |  * 	Note that this helper is not restricted to tracing use cases
 675 |  * 	and can be used with programs attached to TC or XDP as well,
 676 |  * 	where it allows for passing data to user space listeners. Data
 677 |  * 	can be:
 678 |  *
 679 |  * 	* Only custom structs,
 680 |  * 	* Only the packet payload, or
 681 |  * 	* A combination of both.
 682 |  *
 683 |  * Returns
 684 |  * 	0 on success, or a negative error in case of failure.
 685 |  */
 686 | static long (*bpf_perf_event_output)(void *ctx, void *map, __u64 flags, void *data, __u64 size) = (void *) 25;
 687 | 
 688 | /*
 689 |  * bpf_skb_load_bytes
 690 |  *
 691 |  * 	This helper was provided as an easy way to load data from a
 692 |  * 	packet. It can be used to load *len* bytes from *offset* from
 693 |  * 	the packet associated to *skb*, into the buffer pointed by
 694 |  * 	*to*.
 695 |  *
 696 |  * 	Since Linux 4.7, usage of this helper has mostly been replaced
 697 |  * 	by "direct packet access", enabling packet data to be
 698 |  * 	manipulated with *skb*\ **->data** and *skb*\ **->data_end**
 699 |  * 	pointing respectively to the first byte of packet data and to
 700 |  * 	the byte after the last byte of packet data. However, it
 701 |  * 	remains useful if one wishes to read large quantities of data
 702 |  * 	at once from a packet into the eBPF stack.
 703 |  *
 704 |  * Returns
 705 |  * 	0 on success, or a negative error in case of failure.
 706 |  */
 707 | static long (*bpf_skb_load_bytes)(const void *skb, __u32 offset, void *to, __u32 len) = (void *) 26;
 708 | 
 709 | /*
 710 |  * bpf_get_stackid
 711 |  *
 712 |  * 	Walk a user or a kernel stack and return its id. To achieve
 713 |  * 	this, the helper needs *ctx*, which is a pointer to the context
 714 |  * 	on which the tracing program is executed, and a pointer to a
 715 |  * 	*map* of type **BPF_MAP_TYPE_STACK_TRACE**.
 716 |  *
 717 |  * 	The last argument, *flags*, holds the number of stack frames to
 718 |  * 	skip (from 0 to 255), masked with
 719 |  * 	**BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
 720 |  * 	a combination of the following flags:
 721 |  *
 722 |  * 	**BPF_F_USER_STACK**
 723 |  * 		Collect a user space stack instead of a kernel stack.
 724 |  * 	**BPF_F_FAST_STACK_CMP**
 725 |  * 		Compare stacks by hash only.
 726 |  * 	**BPF_F_REUSE_STACKID**
 727 |  * 		If two different stacks hash into the same *stackid*,
 728 |  * 		discard the old one.
 729 |  *
 730 |  * 	The stack id retrieved is a 32 bit long integer handle which
 731 |  * 	can be further combined with other data (including other stack
 732 |  * 	ids) and used as a key into maps. This can be useful for
 733 |  * 	generating a variety of graphs (such as flame graphs or off-cpu
 734 |  * 	graphs).
 735 |  *
 736 |  * 	For walking a stack, this helper is an improvement over
 737 |  * 	**bpf_probe_read**\ (), which can be used with unrolled loops
 738 |  * 	but is not efficient and consumes a lot of eBPF instructions.
 739 |  * 	Instead, **bpf_get_stackid**\ () can collect up to
 740 |  * 	**PERF_MAX_STACK_DEPTH** both kernel and user frames. Note that
 741 |  * 	this limit can be controlled with the **sysctl** program, and
 742 |  * 	that it should be manually increased in order to profile long
 743 |  * 	user stacks (such as stacks for Java programs). To do so, use:
 744 |  *
 745 |  * 	::
 746 |  *
 747 |  * 		# sysctl kernel.perf_event_max_stack=<new value>
 748 |  *
 749 |  * Returns
 750 |  * 	The positive or null stack id on success, or a negative error
 751 |  * 	in case of failure.
 752 |  */
 753 | static long (*bpf_get_stackid)(void *ctx, void *map, __u64 flags) = (void *) 27;
 754 | 
 755 | /*
 756 |  * bpf_csum_diff
 757 |  *
 758 |  * 	Compute a checksum difference, from the raw buffer pointed by
 759 |  * 	*from*, of length *from_size* (that must be a multiple of 4),
 760 |  * 	towards the raw buffer pointed by *to*, of size *to_size*
 761 |  * 	(same remark). An optional *seed* can be added to the value
 762 |  * 	(this can be cascaded, the seed may come from a previous call
 763 |  * 	to the helper).
 764 |  *
 765 |  * 	This is flexible enough to be used in several ways:
 766 |  *
 767 |  * 	* With *from_size* == 0, *to_size* > 0 and *seed* set to
 768 |  * 	  checksum, it can be used when pushing new data.
 769 |  * 	* With *from_size* > 0, *to_size* == 0 and *seed* set to
 770 |  * 	  checksum, it can be used when removing data from a packet.
 771 |  * 	* With *from_size* > 0, *to_size* > 0 and *seed* set to 0, it
 772 |  * 	  can be used to compute a diff. Note that *from_size* and
 773 |  * 	  *to_size* do not need to be equal.
 774 |  *
 775 |  * 	This helper can be used in combination with
 776 |  * 	**bpf_l3_csum_replace**\ () and **bpf_l4_csum_replace**\ (), to
 777 |  * 	which one can feed in the difference computed with
 778 |  * 	**bpf_csum_diff**\ ().
 779 |  *
 780 |  * Returns
 781 |  * 	The checksum result, or a negative error code in case of
 782 |  * 	failure.
 783 |  */
 784 | static __s64 (*bpf_csum_diff)(__be32 *from, __u32 from_size, __be32 *to, __u32 to_size, __wsum seed) = (void *) 28;
 785 | 
 786 | /*
 787 |  * bpf_skb_get_tunnel_opt
 788 |  *
 789 |  * 	Retrieve tunnel options metadata for the packet associated to
 790 |  * 	*skb*, and store the raw tunnel option data to the buffer *opt*
 791 |  * 	of *size*.
 792 |  *
 793 |  * 	This helper can be used with encapsulation devices that can
 794 |  * 	operate in "collect metadata" mode (please refer to the related
 795 |  * 	note in the description of **bpf_skb_get_tunnel_key**\ () for
 796 |  * 	more details). A particular example where this can be used is
 797 |  * 	in combination with the Geneve encapsulation protocol, where it
 798 |  * 	allows for pushing (with **bpf_skb_get_tunnel_opt**\ () helper)
 799 |  * 	and retrieving arbitrary TLVs (Type-Length-Value headers) from
 800 |  * 	the eBPF program. This allows for full customization of these
 801 |  * 	headers.
 802 |  *
 803 |  * Returns
 804 |  * 	The size of the option data retrieved.
 805 |  */
 806 | static long (*bpf_skb_get_tunnel_opt)(struct __sk_buff *skb, void *opt, __u32 size) = (void *) 29;
 807 | 
 808 | /*
 809 |  * bpf_skb_set_tunnel_opt
 810 |  *
 811 |  * 	Set tunnel options metadata for the packet associated to *skb*
 812 |  * 	to the option data contained in the raw buffer *opt* of *size*.
 813 |  *
 814 |  * 	See also the description of the **bpf_skb_get_tunnel_opt**\ ()
 815 |  * 	helper for additional information.
 816 |  *
 817 |  * Returns
 818 |  * 	0 on success, or a negative error in case of failure.
 819 |  */
 820 | static long (*bpf_skb_set_tunnel_opt)(struct __sk_buff *skb, void *opt, __u32 size) = (void *) 30;
 821 | 
 822 | /*
 823 |  * bpf_skb_change_proto
 824 |  *
 825 |  * 	Change the protocol of the *skb* to *proto*. Currently
 826 |  * 	supported are transition from IPv4 to IPv6, and from IPv6 to
 827 |  * 	IPv4. The helper takes care of the groundwork for the
 828 |  * 	transition, including resizing the socket buffer. The eBPF
 829 |  * 	program is expected to fill the new headers, if any, via
 830 |  * 	**skb_store_bytes**\ () and to recompute the checksums with
 831 |  * 	**bpf_l3_csum_replace**\ () and **bpf_l4_csum_replace**\
 832 |  * 	(). The main case for this helper is to perform NAT64
 833 |  * 	operations out of an eBPF program.
 834 |  *
 835 |  * 	Internally, the GSO type is marked as dodgy so that headers are
 836 |  * 	checked and segments are recalculated by the GSO/GRO engine.
 837 |  * 	The size for GSO target is adapted as well.
 838 |  *
 839 |  * 	All values for *flags* are reserved for future usage, and must
 840 |  * 	be left at zero.
 841 |  *
 842 |  * 	A call to this helper is susceptible to change the underlying
 843 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 844 |  * 	previously done by the verifier are invalidated and must be
 845 |  * 	performed again, if the helper is used in combination with
 846 |  * 	direct packet access.
 847 |  *
 848 |  * Returns
 849 |  * 	0 on success, or a negative error in case of failure.
 850 |  */
 851 | static long (*bpf_skb_change_proto)(struct __sk_buff *skb, __be16 proto, __u64 flags) = (void *) 31;
 852 | 
 853 | /*
 854 |  * bpf_skb_change_type
 855 |  *
 856 |  * 	Change the packet type for the packet associated to *skb*. This
 857 |  * 	comes down to setting *skb*\ **->pkt_type** to *type*, except
 858 |  * 	the eBPF program does not have a write access to *skb*\
 859 |  * 	**->pkt_type** beside this helper. Using a helper here allows
 860 |  * 	for graceful handling of errors.
 861 |  *
 862 |  * 	The major use case is to change incoming *skb*s to
 863 |  * 	**PACKET_HOST** in a programmatic way instead of having to
 864 |  * 	recirculate via **redirect**\ (..., **BPF_F_INGRESS**), for
 865 |  * 	example.
 866 |  *
 867 |  * 	Note that *type* only allows certain values. At this time, they
 868 |  * 	are:
 869 |  *
 870 |  * 	**PACKET_HOST**
 871 |  * 		Packet is for us.
 872 |  * 	**PACKET_BROADCAST**
 873 |  * 		Send packet to all.
 874 |  * 	**PACKET_MULTICAST**
 875 |  * 		Send packet to group.
 876 |  * 	**PACKET_OTHERHOST**
 877 |  * 		Send packet to someone else.
 878 |  *
 879 |  * Returns
 880 |  * 	0 on success, or a negative error in case of failure.
 881 |  */
 882 | static long (*bpf_skb_change_type)(struct __sk_buff *skb, __u32 type) = (void *) 32;
 883 | 
 884 | /*
 885 |  * bpf_skb_under_cgroup
 886 |  *
 887 |  * 	Check whether *skb* is a descendant of the cgroup2 held by
 888 |  * 	*map* of type **BPF_MAP_TYPE_CGROUP_ARRAY**, at *index*.
 889 |  *
 890 |  * Returns
 891 |  * 	The return value depends on the result of the test, and can be:
 892 |  *
 893 |  * 	* 0, if the *skb* failed the cgroup2 descendant test.
 894 |  * 	* 1, if the *skb* succeeded the cgroup2 descendant test.
 895 |  * 	* A negative error code, if an error occurred.
 896 |  */
 897 | static long (*bpf_skb_under_cgroup)(struct __sk_buff *skb, void *map, __u32 index) = (void *) 33;
 898 | 
 899 | /*
 900 |  * bpf_get_hash_recalc
 901 |  *
 902 |  * 	Retrieve the hash of the packet, *skb*\ **->hash**. If it is
 903 |  * 	not set, in particular if the hash was cleared due to mangling,
 904 |  * 	recompute this hash. Later accesses to the hash can be done
 905 |  * 	directly with *skb*\ **->hash**.
 906 |  *
 907 |  * 	Calling **bpf_set_hash_invalid**\ (), changing a packet
 908 |  * 	prototype with **bpf_skb_change_proto**\ (), or calling
 909 |  * 	**bpf_skb_store_bytes**\ () with the
 910 |  * 	**BPF_F_INVALIDATE_HASH** are actions susceptible to clear
 911 |  * 	the hash and to trigger a new computation for the next call to
 912 |  * 	**bpf_get_hash_recalc**\ ().
 913 |  *
 914 |  * Returns
 915 |  * 	The 32-bit hash.
 916 |  */
 917 | static __u32 (*bpf_get_hash_recalc)(struct __sk_buff *skb) = (void *) 34;
 918 | 
 919 | /*
 920 |  * bpf_get_current_task
 921 |  *
 922 |  *
 923 |  * Returns
 924 |  * 	A pointer to the current task struct.
 925 |  */
 926 | static __u64 (*bpf_get_current_task)(void) = (void *) 35;
 927 | 
 928 | /*
 929 |  * bpf_probe_write_user
 930 |  *
 931 |  * 	Attempt in a safe way to write *len* bytes from the buffer
 932 |  * 	*src* to *dst* in memory. It only works for threads that are in
 933 |  * 	user context, and *dst* must be a valid user space address.
 934 |  *
 935 |  * 	This helper should not be used to implement any kind of
 936 |  * 	security mechanism because of TOC-TOU attacks, but rather to
 937 |  * 	debug, divert, and manipulate execution of semi-cooperative
 938 |  * 	processes.
 939 |  *
 940 |  * 	Keep in mind that this feature is meant for experiments, and it
 941 |  * 	has a risk of crashing the system and running programs.
 942 |  * 	Therefore, when an eBPF program using this helper is attached,
 943 |  * 	a warning including PID and process name is printed to kernel
 944 |  * 	logs.
 945 |  *
 946 |  * Returns
 947 |  * 	0 on success, or a negative error in case of failure.
 948 |  */
 949 | static long (*bpf_probe_write_user)(void *dst, const void *src, __u32 len) = (void *) 36;
 950 | 
 951 | /*
 952 |  * bpf_current_task_under_cgroup
 953 |  *
 954 |  * 	Check whether the probe is being run is the context of a given
 955 |  * 	subset of the cgroup2 hierarchy. The cgroup2 to test is held by
 956 |  * 	*map* of type **BPF_MAP_TYPE_CGROUP_ARRAY**, at *index*.
 957 |  *
 958 |  * Returns
 959 |  * 	The return value depends on the result of the test, and can be:
 960 |  *
 961 |  * 	* 0, if current task belongs to the cgroup2.
 962 |  * 	* 1, if current task does not belong to the cgroup2.
 963 |  * 	* A negative error code, if an error occurred.
 964 |  */
 965 | static long (*bpf_current_task_under_cgroup)(void *map, __u32 index) = (void *) 37;
 966 | 
 967 | /*
 968 |  * bpf_skb_change_tail
 969 |  *
 970 |  * 	Resize (trim or grow) the packet associated to *skb* to the
 971 |  * 	new *len*. The *flags* are reserved for future usage, and must
 972 |  * 	be left at zero.
 973 |  *
 974 |  * 	The basic idea is that the helper performs the needed work to
 975 |  * 	change the size of the packet, then the eBPF program rewrites
 976 |  * 	the rest via helpers like **bpf_skb_store_bytes**\ (),
 977 |  * 	**bpf_l3_csum_replace**\ (), **bpf_l3_csum_replace**\ ()
 978 |  * 	and others. This helper is a slow path utility intended for
 979 |  * 	replies with control messages. And because it is targeted for
 980 |  * 	slow path, the helper itself can afford to be slow: it
 981 |  * 	implicitly linearizes, unclones and drops offloads from the
 982 |  * 	*skb*.
 983 |  *
 984 |  * 	A call to this helper is susceptible to change the underlying
 985 |  * 	packet buffer. Therefore, at load time, all checks on pointers
 986 |  * 	previously done by the verifier are invalidated and must be
 987 |  * 	performed again, if the helper is used in combination with
 988 |  * 	direct packet access.
 989 |  *
 990 |  * Returns
 991 |  * 	0 on success, or a negative error in case of failure.
 992 |  */
 993 | static long (*bpf_skb_change_tail)(struct __sk_buff *skb, __u32 len, __u64 flags) = (void *) 38;
 994 | 
 995 | /*
 996 |  * bpf_skb_pull_data
 997 |  *
 998 |  * 	Pull in non-linear data in case the *skb* is non-linear and not
 999 |  * 	all of *len* are part of the linear section. Make *len* bytes
1000 |  * 	from *skb* readable and writable. If a zero value is passed for
1001 |  * 	*len*, then the whole length of the *skb* is pulled.
1002 |  *
1003 |  * 	This helper is only needed for reading and writing with direct
1004 |  * 	packet access.
1005 |  *
1006 |  * 	For direct packet access, testing that offsets to access
1007 |  * 	are within packet boundaries (test on *skb*\ **->data_end**) is
1008 |  * 	susceptible to fail if offsets are invalid, or if the requested
1009 |  * 	data is in non-linear parts of the *skb*. On failure the
1010 |  * 	program can just bail out, or in the case of a non-linear
1011 |  * 	buffer, use a helper to make the data available. The
1012 |  * 	**bpf_skb_load_bytes**\ () helper is a first solution to access
1013 |  * 	the data. Another one consists in using **bpf_skb_pull_data**
1014 |  * 	to pull in once the non-linear parts, then retesting and
1015 |  * 	eventually access the data.
1016 |  *
1017 |  * 	At the same time, this also makes sure the *skb* is uncloned,
1018 |  * 	which is a necessary condition for direct write. As this needs
1019 |  * 	to be an invariant for the write part only, the verifier
1020 |  * 	detects writes and adds a prologue that is calling
1021 |  * 	**bpf_skb_pull_data()** to effectively unclone the *skb* from
1022 |  * 	the very beginning in case it is indeed cloned.
1023 |  *
1024 |  * 	A call to this helper is susceptible to change the underlying
1025 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1026 |  * 	previously done by the verifier are invalidated and must be
1027 |  * 	performed again, if the helper is used in combination with
1028 |  * 	direct packet access.
1029 |  *
1030 |  * Returns
1031 |  * 	0 on success, or a negative error in case of failure.
1032 |  */
1033 | static long (*bpf_skb_pull_data)(struct __sk_buff *skb, __u32 len) = (void *) 39;
1034 | 
1035 | /*
1036 |  * bpf_csum_update
1037 |  *
1038 |  * 	Add the checksum *csum* into *skb*\ **->csum** in case the
1039 |  * 	driver has supplied a checksum for the entire packet into that
1040 |  * 	field. Return an error otherwise. This helper is intended to be
1041 |  * 	used in combination with **bpf_csum_diff**\ (), in particular
1042 |  * 	when the checksum needs to be updated after data has been
1043 |  * 	written into the packet through direct packet access.
1044 |  *
1045 |  * Returns
1046 |  * 	The checksum on success, or a negative error code in case of
1047 |  * 	failure.
1048 |  */
1049 | static __s64 (*bpf_csum_update)(struct __sk_buff *skb, __wsum csum) = (void *) 40;
1050 | 
1051 | /*
1052 |  * bpf_set_hash_invalid
1053 |  *
1054 |  * 	Invalidate the current *skb*\ **->hash**. It can be used after
1055 |  * 	mangling on headers through direct packet access, in order to
1056 |  * 	indicate that the hash is outdated and to trigger a
1057 |  * 	recalculation the next time the kernel tries to access this
1058 |  * 	hash or when the **bpf_get_hash_recalc**\ () helper is called.
1059 |  *
1060 |  */
1061 | static void (*bpf_set_hash_invalid)(struct __sk_buff *skb) = (void *) 41;
1062 | 
1063 | /*
1064 |  * bpf_get_numa_node_id
1065 |  *
1066 |  * 	Return the id of the current NUMA node. The primary use case
1067 |  * 	for this helper is the selection of sockets for the local NUMA
1068 |  * 	node, when the program is attached to sockets using the
1069 |  * 	**SO_ATTACH_REUSEPORT_EBPF** option (see also **socket(7)**),
1070 |  * 	but the helper is also available to other eBPF program types,
1071 |  * 	similarly to **bpf_get_smp_processor_id**\ ().
1072 |  *
1073 |  * Returns
1074 |  * 	The id of current NUMA node.
1075 |  */
1076 | static long (*bpf_get_numa_node_id)(void) = (void *) 42;
1077 | 
1078 | /*
1079 |  * bpf_skb_change_head
1080 |  *
1081 |  * 	Grows headroom of packet associated to *skb* and adjusts the
1082 |  * 	offset of the MAC header accordingly, adding *len* bytes of
1083 |  * 	space. It automatically extends and reallocates memory as
1084 |  * 	required.
1085 |  *
1086 |  * 	This helper can be used on a layer 3 *skb* to push a MAC header
1087 |  * 	for redirection into a layer 2 device.
1088 |  *
1089 |  * 	All values for *flags* are reserved for future usage, and must
1090 |  * 	be left at zero.
1091 |  *
1092 |  * 	A call to this helper is susceptible to change the underlying
1093 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1094 |  * 	previously done by the verifier are invalidated and must be
1095 |  * 	performed again, if the helper is used in combination with
1096 |  * 	direct packet access.
1097 |  *
1098 |  * Returns
1099 |  * 	0 on success, or a negative error in case of failure.
1100 |  */
1101 | static long (*bpf_skb_change_head)(struct __sk_buff *skb, __u32 len, __u64 flags) = (void *) 43;
1102 | 
1103 | /*
1104 |  * bpf_xdp_adjust_head
1105 |  *
1106 |  * 	Adjust (move) *xdp_md*\ **->data** by *delta* bytes. Note that
1107 |  * 	it is possible to use a negative value for *delta*. This helper
1108 |  * 	can be used to prepare the packet for pushing or popping
1109 |  * 	headers.
1110 |  *
1111 |  * 	A call to this helper is susceptible to change the underlying
1112 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1113 |  * 	previously done by the verifier are invalidated and must be
1114 |  * 	performed again, if the helper is used in combination with
1115 |  * 	direct packet access.
1116 |  *
1117 |  * Returns
1118 |  * 	0 on success, or a negative error in case of failure.
1119 |  */
1120 | static long (*bpf_xdp_adjust_head)(struct xdp_md *xdp_md, int delta) = (void *) 44;
1121 | 
1122 | /*
1123 |  * bpf_probe_read_str
1124 |  *
1125 |  * 	Copy a NUL terminated string from an unsafe kernel address
1126 |  * 	*unsafe_ptr* to *dst*. See **bpf_probe_read_kernel_str**\ () for
1127 |  * 	more details.
1128 |  *
1129 |  * 	Generally, use **bpf_probe_read_user_str**\ () or
1130 |  * 	**bpf_probe_read_kernel_str**\ () instead.
1131 |  *
1132 |  * Returns
1133 |  * 	On success, the strictly positive length of the string,
1134 |  * 	including the trailing NUL character. On error, a negative
1135 |  * 	value.
1136 |  */
1137 | static long (*bpf_probe_read_str)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 45;
1138 | 
1139 | /*
1140 |  * bpf_get_socket_cookie
1141 |  *
1142 |  * 	If the **struct sk_buff** pointed by *skb* has a known socket,
1143 |  * 	retrieve the cookie (generated by the kernel) of this socket.
1144 |  * 	If no cookie has been set yet, generate a new cookie. Once
1145 |  * 	generated, the socket cookie remains stable for the life of the
1146 |  * 	socket. This helper can be useful for monitoring per socket
1147 |  * 	networking traffic statistics as it provides a global socket
1148 |  * 	identifier that can be assumed unique.
1149 |  *
1150 |  * Returns
1151 |  * 	A 8-byte long unique number on success, or 0 if the socket
1152 |  * 	field is missing inside *skb*.
1153 |  */
1154 | static __u64 (*bpf_get_socket_cookie)(void *ctx) = (void *) 46;
1155 | 
1156 | /*
1157 |  * bpf_get_socket_uid
1158 |  *
1159 |  *
1160 |  * Returns
1161 |  * 	The owner UID of the socket associated to *skb*. If the socket
1162 |  * 	is **NULL**, or if it is not a full socket (i.e. if it is a
1163 |  * 	time-wait or a request socket instead), **overflowuid** value
1164 |  * 	is returned (note that **overflowuid** might also be the actual
1165 |  * 	UID value for the socket).
1166 |  */
1167 | static __u32 (*bpf_get_socket_uid)(struct __sk_buff *skb) = (void *) 47;
1168 | 
1169 | /*
1170 |  * bpf_set_hash
1171 |  *
1172 |  * 	Set the full hash for *skb* (set the field *skb*\ **->hash**)
1173 |  * 	to value *hash*.
1174 |  *
1175 |  * Returns
1176 |  * 	0
1177 |  */
1178 | static long (*bpf_set_hash)(struct __sk_buff *skb, __u32 hash) = (void *) 48;
1179 | 
1180 | /*
1181 |  * bpf_setsockopt
1182 |  *
1183 |  * 	Emulate a call to **setsockopt()** on the socket associated to
1184 |  * 	*bpf_socket*, which must be a full socket. The *level* at
1185 |  * 	which the option resides and the name *optname* of the option
1186 |  * 	must be specified, see **setsockopt(2)** for more information.
1187 |  * 	The option value of length *optlen* is pointed by *optval*.
1188 |  *
1189 |  * 	*bpf_socket* should be one of the following:
1190 |  *
1191 |  * 	* **struct bpf_sock_ops** for **BPF_PROG_TYPE_SOCK_OPS**.
1192 |  * 	* **struct bpf_sock_addr** for **BPF_CGROUP_INET4_CONNECT**
1193 |  * 	  and **BPF_CGROUP_INET6_CONNECT**.
1194 |  *
1195 |  * 	This helper actually implements a subset of **setsockopt()**.
1196 |  * 	It supports the following *level*\ s:
1197 |  *
1198 |  * 	* **SOL_SOCKET**, which supports the following *optname*\ s:
1199 |  * 	  **SO_RCVBUF**, **SO_SNDBUF**, **SO_MAX_PACING_RATE**,
1200 |  * 	  **SO_PRIORITY**, **SO_RCVLOWAT**, **SO_MARK**,
1201 |  * 	  **SO_BINDTODEVICE**, **SO_KEEPALIVE**.
1202 |  * 	* **IPPROTO_TCP**, which supports the following *optname*\ s:
1203 |  * 	  **TCP_CONGESTION**, **TCP_BPF_IW**,
1204 |  * 	  **TCP_BPF_SNDCWND_CLAMP**, **TCP_SAVE_SYN**,
1205 |  * 	  **TCP_KEEPIDLE**, **TCP_KEEPINTVL**, **TCP_KEEPCNT**,
1206 |  * 	  **TCP_SYNCNT**, **TCP_USER_TIMEOUT**, **TCP_NOTSENT_LOWAT**.
1207 |  * 	* **IPPROTO_IP**, which supports *optname* **IP_TOS**.
1208 |  * 	* **IPPROTO_IPV6**, which supports *optname* **IPV6_TCLASS**.
1209 |  *
1210 |  * Returns
1211 |  * 	0 on success, or a negative error in case of failure.
1212 |  */
1213 | static long (*bpf_setsockopt)(void *bpf_socket, int level, int optname, void *optval, int optlen) = (void *) 49;
1214 | 
1215 | /*
1216 |  * bpf_skb_adjust_room
1217 |  *
1218 |  * 	Grow or shrink the room for data in the packet associated to
1219 |  * 	*skb* by *len_diff*, and according to the selected *mode*.
1220 |  *
1221 |  * 	By default, the helper will reset any offloaded checksum
1222 |  * 	indicator of the skb to CHECKSUM_NONE. This can be avoided
1223 |  * 	by the following flag:
1224 |  *
1225 |  * 	* **BPF_F_ADJ_ROOM_NO_CSUM_RESET**: Do not reset offloaded
1226 |  * 	  checksum data of the skb to CHECKSUM_NONE.
1227 |  *
1228 |  * 	There are two supported modes at this time:
1229 |  *
1230 |  * 	* **BPF_ADJ_ROOM_MAC**: Adjust room at the mac layer
1231 |  * 	  (room space is added or removed below the layer 2 header).
1232 |  *
1233 |  * 	* **BPF_ADJ_ROOM_NET**: Adjust room at the network layer
1234 |  * 	  (room space is added or removed below the layer 3 header).
1235 |  *
1236 |  * 	The following flags are supported at this time:
1237 |  *
1238 |  * 	* **BPF_F_ADJ_ROOM_FIXED_GSO**: Do not adjust gso_size.
1239 |  * 	  Adjusting mss in this way is not allowed for datagrams.
1240 |  *
1241 |  * 	* **BPF_F_ADJ_ROOM_ENCAP_L3_IPV4**,
1242 |  * 	  **BPF_F_ADJ_ROOM_ENCAP_L3_IPV6**:
1243 |  * 	  Any new space is reserved to hold a tunnel header.
1244 |  * 	  Configure skb offsets and other fields accordingly.
1245 |  *
1246 |  * 	* **BPF_F_ADJ_ROOM_ENCAP_L4_GRE**,
1247 |  * 	  **BPF_F_ADJ_ROOM_ENCAP_L4_UDP**:
1248 |  * 	  Use with ENCAP_L3 flags to further specify the tunnel type.
1249 |  *
1250 |  * 	* **BPF_F_ADJ_ROOM_ENCAP_L2**\ (*len*):
1251 |  * 	  Use with ENCAP_L3/L4 flags to further specify the tunnel
1252 |  * 	  type; *len* is the length of the inner MAC header.
1253 |  *
1254 |  * 	* **BPF_F_ADJ_ROOM_ENCAP_L2_ETH**:
1255 |  * 	  Use with BPF_F_ADJ_ROOM_ENCAP_L2 flag to further specify the
1256 |  * 	  L2 type as Ethernet.
1257 |  *
1258 |  * 	A call to this helper is susceptible to change the underlying
1259 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1260 |  * 	previously done by the verifier are invalidated and must be
1261 |  * 	performed again, if the helper is used in combination with
1262 |  * 	direct packet access.
1263 |  *
1264 |  * Returns
1265 |  * 	0 on success, or a negative error in case of failure.
1266 |  */
1267 | static long (*bpf_skb_adjust_room)(struct __sk_buff *skb, __s32 len_diff, __u32 mode, __u64 flags) = (void *) 50;
1268 | 
1269 | /*
1270 |  * bpf_redirect_map
1271 |  *
1272 |  * 	Redirect the packet to the endpoint referenced by *map* at
1273 |  * 	index *key*. Depending on its type, this *map* can contain
1274 |  * 	references to net devices (for forwarding packets through other
1275 |  * 	ports), or to CPUs (for redirecting XDP frames to another CPU;
1276 |  * 	but this is only implemented for native XDP (with driver
1277 |  * 	support) as of this writing).
1278 |  *
1279 |  * 	The lower two bits of *flags* are used as the return code if
1280 |  * 	the map lookup fails. This is so that the return value can be
1281 |  * 	one of the XDP program return codes up to **XDP_TX**, as chosen
1282 |  * 	by the caller. The higher bits of *flags* can be set to
1283 |  * 	BPF_F_BROADCAST or BPF_F_EXCLUDE_INGRESS as defined below.
1284 |  *
1285 |  * 	With BPF_F_BROADCAST the packet will be broadcasted to all the
1286 |  * 	interfaces in the map, with BPF_F_EXCLUDE_INGRESS the ingress
1287 |  * 	interface will be excluded when do broadcasting.
1288 |  *
1289 |  * 	See also **bpf_redirect**\ (), which only supports redirecting
1290 |  * 	to an ifindex, but doesn't require a map to do so.
1291 |  *
1292 |  * Returns
1293 |  * 	**XDP_REDIRECT** on success, or the value of the two lower bits
1294 |  * 	of the *flags* argument on error.
1295 |  */
1296 | static long (*bpf_redirect_map)(void *map, __u32 key, __u64 flags) = (void *) 51;
1297 | 
1298 | /*
1299 |  * bpf_sk_redirect_map
1300 |  *
1301 |  * 	Redirect the packet to the socket referenced by *map* (of type
1302 |  * 	**BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
1303 |  * 	egress interfaces can be used for redirection. The
1304 |  * 	**BPF_F_INGRESS** value in *flags* is used to make the
1305 |  * 	distinction (ingress path is selected if the flag is present,
1306 |  * 	egress path otherwise). This is the only flag supported for now.
1307 |  *
1308 |  * Returns
1309 |  * 	**SK_PASS** on success, or **SK_DROP** on error.
1310 |  */
1311 | static long (*bpf_sk_redirect_map)(struct __sk_buff *skb, void *map, __u32 key, __u64 flags) = (void *) 52;
1312 | 
1313 | /*
1314 |  * bpf_sock_map_update
1315 |  *
1316 |  * 	Add an entry to, or update a *map* referencing sockets. The
1317 |  * 	*skops* is used as a new value for the entry associated to
1318 |  * 	*key*. *flags* is one of:
1319 |  *
1320 |  * 	**BPF_NOEXIST**
1321 |  * 		The entry for *key* must not exist in the map.
1322 |  * 	**BPF_EXIST**
1323 |  * 		The entry for *key* must already exist in the map.
1324 |  * 	**BPF_ANY**
1325 |  * 		No condition on the existence of the entry for *key*.
1326 |  *
1327 |  * 	If the *map* has eBPF programs (parser and verdict), those will
1328 |  * 	be inherited by the socket being added. If the socket is
1329 |  * 	already attached to eBPF programs, this results in an error.
1330 |  *
1331 |  * Returns
1332 |  * 	0 on success, or a negative error in case of failure.
1333 |  */
1334 | static long (*bpf_sock_map_update)(struct bpf_sock_ops *skops, void *map, void *key, __u64 flags) = (void *) 53;
1335 | 
1336 | /*
1337 |  * bpf_xdp_adjust_meta
1338 |  *
1339 |  * 	Adjust the address pointed by *xdp_md*\ **->data_meta** by
1340 |  * 	*delta* (which can be positive or negative). Note that this
1341 |  * 	operation modifies the address stored in *xdp_md*\ **->data**,
1342 |  * 	so the latter must be loaded only after the helper has been
1343 |  * 	called.
1344 |  *
1345 |  * 	The use of *xdp_md*\ **->data_meta** is optional and programs
1346 |  * 	are not required to use it. The rationale is that when the
1347 |  * 	packet is processed with XDP (e.g. as DoS filter), it is
1348 |  * 	possible to push further meta data along with it before passing
1349 |  * 	to the stack, and to give the guarantee that an ingress eBPF
1350 |  * 	program attached as a TC classifier on the same device can pick
1351 |  * 	this up for further post-processing. Since TC works with socket
1352 |  * 	buffers, it remains possible to set from XDP the **mark** or
1353 |  * 	**priority** pointers, or other pointers for the socket buffer.
1354 |  * 	Having this scratch space generic and programmable allows for
1355 |  * 	more flexibility as the user is free to store whatever meta
1356 |  * 	data they need.
1357 |  *
1358 |  * 	A call to this helper is susceptible to change the underlying
1359 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1360 |  * 	previously done by the verifier are invalidated and must be
1361 |  * 	performed again, if the helper is used in combination with
1362 |  * 	direct packet access.
1363 |  *
1364 |  * Returns
1365 |  * 	0 on success, or a negative error in case of failure.
1366 |  */
1367 | static long (*bpf_xdp_adjust_meta)(struct xdp_md *xdp_md, int delta) = (void *) 54;
1368 | 
1369 | /*
1370 |  * bpf_perf_event_read_value
1371 |  *
1372 |  * 	Read the value of a perf event counter, and store it into *buf*
1373 |  * 	of size *buf_size*. This helper relies on a *map* of type
1374 |  * 	**BPF_MAP_TYPE_PERF_EVENT_ARRAY**. The nature of the perf event
1375 |  * 	counter is selected when *map* is updated with perf event file
1376 |  * 	descriptors. The *map* is an array whose size is the number of
1377 |  * 	available CPUs, and each cell contains a value relative to one
1378 |  * 	CPU. The value to retrieve is indicated by *flags*, that
1379 |  * 	contains the index of the CPU to look up, masked with
1380 |  * 	**BPF_F_INDEX_MASK**. Alternatively, *flags* can be set to
1381 |  * 	**BPF_F_CURRENT_CPU** to indicate that the value for the
1382 |  * 	current CPU should be retrieved.
1383 |  *
1384 |  * 	This helper behaves in a way close to
1385 |  * 	**bpf_perf_event_read**\ () helper, save that instead of
1386 |  * 	just returning the value observed, it fills the *buf*
1387 |  * 	structure. This allows for additional data to be retrieved: in
1388 |  * 	particular, the enabled and running times (in *buf*\
1389 |  * 	**->enabled** and *buf*\ **->running**, respectively) are
1390 |  * 	copied. In general, **bpf_perf_event_read_value**\ () is
1391 |  * 	recommended over **bpf_perf_event_read**\ (), which has some
1392 |  * 	ABI issues and provides fewer functionalities.
1393 |  *
1394 |  * 	These values are interesting, because hardware PMU (Performance
1395 |  * 	Monitoring Unit) counters are limited resources. When there are
1396 |  * 	more PMU based perf events opened than available counters,
1397 |  * 	kernel will multiplex these events so each event gets certain
1398 |  * 	percentage (but not all) of the PMU time. In case that
1399 |  * 	multiplexing happens, the number of samples or counter value
1400 |  * 	will not reflect the case compared to when no multiplexing
1401 |  * 	occurs. This makes comparison between different runs difficult.
1402 |  * 	Typically, the counter value should be normalized before
1403 |  * 	comparing to other experiments. The usual normalization is done
1404 |  * 	as follows.
1405 |  *
1406 |  * 	::
1407 |  *
1408 |  * 		normalized_counter = counter * t_enabled / t_running
1409 |  *
1410 |  * 	Where t_enabled is the time enabled for event and t_running is
1411 |  * 	the time running for event since last normalization. The
1412 |  * 	enabled and running times are accumulated since the perf event
1413 |  * 	open. To achieve scaling factor between two invocations of an
1414 |  * 	eBPF program, users can use CPU id as the key (which is
1415 |  * 	typical for perf array usage model) to remember the previous
1416 |  * 	value and do the calculation inside the eBPF program.
1417 |  *
1418 |  * Returns
1419 |  * 	0 on success, or a negative error in case of failure.
1420 |  */
1421 | static long (*bpf_perf_event_read_value)(void *map, __u64 flags, struct bpf_perf_event_value *buf, __u32 buf_size) = (void *) 55;
1422 | 
1423 | /*
1424 |  * bpf_perf_prog_read_value
1425 |  *
1426 |  * 	For en eBPF program attached to a perf event, retrieve the
1427 |  * 	value of the event counter associated to *ctx* and store it in
1428 |  * 	the structure pointed by *buf* and of size *buf_size*. Enabled
1429 |  * 	and running times are also stored in the structure (see
1430 |  * 	description of helper **bpf_perf_event_read_value**\ () for
1431 |  * 	more details).
1432 |  *
1433 |  * Returns
1434 |  * 	0 on success, or a negative error in case of failure.
1435 |  */
1436 | static long (*bpf_perf_prog_read_value)(struct bpf_perf_event_data *ctx, struct bpf_perf_event_value *buf, __u32 buf_size) = (void *) 56;
1437 | 
1438 | /*
1439 |  * bpf_getsockopt
1440 |  *
1441 |  * 	Emulate a call to **getsockopt()** on the socket associated to
1442 |  * 	*bpf_socket*, which must be a full socket. The *level* at
1443 |  * 	which the option resides and the name *optname* of the option
1444 |  * 	must be specified, see **getsockopt(2)** for more information.
1445 |  * 	The retrieved value is stored in the structure pointed by
1446 |  * 	*opval* and of length *optlen*.
1447 |  *
1448 |  * 	*bpf_socket* should be one of the following:
1449 |  *
1450 |  * 	* **struct bpf_sock_ops** for **BPF_PROG_TYPE_SOCK_OPS**.
1451 |  * 	* **struct bpf_sock_addr** for **BPF_CGROUP_INET4_CONNECT**
1452 |  * 	  and **BPF_CGROUP_INET6_CONNECT**.
1453 |  *
1454 |  * 	This helper actually implements a subset of **getsockopt()**.
1455 |  * 	It supports the following *level*\ s:
1456 |  *
1457 |  * 	* **IPPROTO_TCP**, which supports *optname*
1458 |  * 	  **TCP_CONGESTION**.
1459 |  * 	* **IPPROTO_IP**, which supports *optname* **IP_TOS**.
1460 |  * 	* **IPPROTO_IPV6**, which supports *optname* **IPV6_TCLASS**.
1461 |  *
1462 |  * Returns
1463 |  * 	0 on success, or a negative error in case of failure.
1464 |  */
1465 | static long (*bpf_getsockopt)(void *bpf_socket, int level, int optname, void *optval, int optlen) = (void *) 57;
1466 | 
1467 | /*
1468 |  * bpf_override_return
1469 |  *
1470 |  * 	Used for error injection, this helper uses kprobes to override
1471 |  * 	the return value of the probed function, and to set it to *rc*.
1472 |  * 	The first argument is the context *regs* on which the kprobe
1473 |  * 	works.
1474 |  *
1475 |  * 	This helper works by setting the PC (program counter)
1476 |  * 	to an override function which is run in place of the original
1477 |  * 	probed function. This means the probed function is not run at
1478 |  * 	all. The replacement function just returns with the required
1479 |  * 	value.
1480 |  *
1481 |  * 	This helper has security implications, and thus is subject to
1482 |  * 	restrictions. It is only available if the kernel was compiled
1483 |  * 	with the **CONFIG_BPF_KPROBE_OVERRIDE** configuration
1484 |  * 	option, and in this case it only works on functions tagged with
1485 |  * 	**ALLOW_ERROR_INJECTION** in the kernel code.
1486 |  *
1487 |  * 	Also, the helper is only available for the architectures having
1488 |  * 	the CONFIG_FUNCTION_ERROR_INJECTION option. As of this writing,
1489 |  * 	x86 architecture is the only one to support this feature.
1490 |  *
1491 |  * Returns
1492 |  * 	0
1493 |  */
1494 | static long (*bpf_override_return)(struct pt_regs *regs, __u64 rc) = (void *) 58;
1495 | 
1496 | /*
1497 |  * bpf_sock_ops_cb_flags_set
1498 |  *
1499 |  * 	Attempt to set the value of the **bpf_sock_ops_cb_flags** field
1500 |  * 	for the full TCP socket associated to *bpf_sock_ops* to
1501 |  * 	*argval*.
1502 |  *
1503 |  * 	The primary use of this field is to determine if there should
1504 |  * 	be calls to eBPF programs of type
1505 |  * 	**BPF_PROG_TYPE_SOCK_OPS** at various points in the TCP
1506 |  * 	code. A program of the same type can change its value, per
1507 |  * 	connection and as necessary, when the connection is
1508 |  * 	established. This field is directly accessible for reading, but
1509 |  * 	this helper must be used for updates in order to return an
1510 |  * 	error if an eBPF program tries to set a callback that is not
1511 |  * 	supported in the current kernel.
1512 |  *
1513 |  * 	*argval* is a flag array which can combine these flags:
1514 |  *
1515 |  * 	* **BPF_SOCK_OPS_RTO_CB_FLAG** (retransmission time out)
1516 |  * 	* **BPF_SOCK_OPS_RETRANS_CB_FLAG** (retransmission)
1517 |  * 	* **BPF_SOCK_OPS_STATE_CB_FLAG** (TCP state change)
1518 |  * 	* **BPF_SOCK_OPS_RTT_CB_FLAG** (every RTT)
1519 |  *
1520 |  * 	Therefore, this function can be used to clear a callback flag by
1521 |  * 	setting the appropriate bit to zero. e.g. to disable the RTO
1522 |  * 	callback:
1523 |  *
1524 |  * 	**bpf_sock_ops_cb_flags_set(bpf_sock,**
1525 |  * 		**bpf_sock->bpf_sock_ops_cb_flags & ~BPF_SOCK_OPS_RTO_CB_FLAG)**
1526 |  *
1527 |  * 	Here are some examples of where one could call such eBPF
1528 |  * 	program:
1529 |  *
1530 |  * 	* When RTO fires.
1531 |  * 	* When a packet is retransmitted.
1532 |  * 	* When the connection terminates.
1533 |  * 	* When a packet is sent.
1534 |  * 	* When a packet is received.
1535 |  *
1536 |  * Returns
1537 |  * 	Code **-EINVAL** if the socket is not a full TCP socket;
1538 |  * 	otherwise, a positive number containing the bits that could not
1539 |  * 	be set is returned (which comes down to 0 if all bits were set
1540 |  * 	as required).
1541 |  */
1542 | static long (*bpf_sock_ops_cb_flags_set)(struct bpf_sock_ops *bpf_sock, int argval) = (void *) 59;
1543 | 
1544 | /*
1545 |  * bpf_msg_redirect_map
1546 |  *
1547 |  * 	This helper is used in programs implementing policies at the
1548 |  * 	socket level. If the message *msg* is allowed to pass (i.e. if
1549 |  * 	the verdict eBPF program returns **SK_PASS**), redirect it to
1550 |  * 	the socket referenced by *map* (of type
1551 |  * 	**BPF_MAP_TYPE_SOCKMAP**) at index *key*. Both ingress and
1552 |  * 	egress interfaces can be used for redirection. The
1553 |  * 	**BPF_F_INGRESS** value in *flags* is used to make the
1554 |  * 	distinction (ingress path is selected if the flag is present,
1555 |  * 	egress path otherwise). This is the only flag supported for now.
1556 |  *
1557 |  * Returns
1558 |  * 	**SK_PASS** on success, or **SK_DROP** on error.
1559 |  */
1560 | static long (*bpf_msg_redirect_map)(struct sk_msg_md *msg, void *map, __u32 key, __u64 flags) = (void *) 60;
1561 | 
1562 | /*
1563 |  * bpf_msg_apply_bytes
1564 |  *
1565 |  * 	For socket policies, apply the verdict of the eBPF program to
1566 |  * 	the next *bytes* (number of bytes) of message *msg*.
1567 |  *
1568 |  * 	For example, this helper can be used in the following cases:
1569 |  *
1570 |  * 	* A single **sendmsg**\ () or **sendfile**\ () system call
1571 |  * 	  contains multiple logical messages that the eBPF program is
1572 |  * 	  supposed to read and for which it should apply a verdict.
1573 |  * 	* An eBPF program only cares to read the first *bytes* of a
1574 |  * 	  *msg*. If the message has a large payload, then setting up
1575 |  * 	  and calling the eBPF program repeatedly for all bytes, even
1576 |  * 	  though the verdict is already known, would create unnecessary
1577 |  * 	  overhead.
1578 |  *
1579 |  * 	When called from within an eBPF program, the helper sets a
1580 |  * 	counter internal to the BPF infrastructure, that is used to
1581 |  * 	apply the last verdict to the next *bytes*. If *bytes* is
1582 |  * 	smaller than the current data being processed from a
1583 |  * 	**sendmsg**\ () or **sendfile**\ () system call, the first
1584 |  * 	*bytes* will be sent and the eBPF program will be re-run with
1585 |  * 	the pointer for start of data pointing to byte number *bytes*
1586 |  * 	**+ 1**. If *bytes* is larger than the current data being
1587 |  * 	processed, then the eBPF verdict will be applied to multiple
1588 |  * 	**sendmsg**\ () or **sendfile**\ () calls until *bytes* are
1589 |  * 	consumed.
1590 |  *
1591 |  * 	Note that if a socket closes with the internal counter holding
1592 |  * 	a non-zero value, this is not a problem because data is not
1593 |  * 	being buffered for *bytes* and is sent as it is received.
1594 |  *
1595 |  * Returns
1596 |  * 	0
1597 |  */
1598 | static long (*bpf_msg_apply_bytes)(struct sk_msg_md *msg, __u32 bytes) = (void *) 61;
1599 | 
1600 | /*
1601 |  * bpf_msg_cork_bytes
1602 |  *
1603 |  * 	For socket policies, prevent the execution of the verdict eBPF
1604 |  * 	program for message *msg* until *bytes* (byte number) have been
1605 |  * 	accumulated.
1606 |  *
1607 |  * 	This can be used when one needs a specific number of bytes
1608 |  * 	before a verdict can be assigned, even if the data spans
1609 |  * 	multiple **sendmsg**\ () or **sendfile**\ () calls. The extreme
1610 |  * 	case would be a user calling **sendmsg**\ () repeatedly with
1611 |  * 	1-byte long message segments. Obviously, this is bad for
1612 |  * 	performance, but it is still valid. If the eBPF program needs
1613 |  * 	*bytes* bytes to validate a header, this helper can be used to
1614 |  * 	prevent the eBPF program to be called again until *bytes* have
1615 |  * 	been accumulated.
1616 |  *
1617 |  * Returns
1618 |  * 	0
1619 |  */
1620 | static long (*bpf_msg_cork_bytes)(struct sk_msg_md *msg, __u32 bytes) = (void *) 62;
1621 | 
1622 | /*
1623 |  * bpf_msg_pull_data
1624 |  *
1625 |  * 	For socket policies, pull in non-linear data from user space
1626 |  * 	for *msg* and set pointers *msg*\ **->data** and *msg*\
1627 |  * 	**->data_end** to *start* and *end* bytes offsets into *msg*,
1628 |  * 	respectively.
1629 |  *
1630 |  * 	If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
1631 |  * 	*msg* it can only parse data that the (**data**, **data_end**)
1632 |  * 	pointers have already consumed. For **sendmsg**\ () hooks this
1633 |  * 	is likely the first scatterlist element. But for calls relying
1634 |  * 	on the **sendpage** handler (e.g. **sendfile**\ ()) this will
1635 |  * 	be the range (**0**, **0**) because the data is shared with
1636 |  * 	user space and by default the objective is to avoid allowing
1637 |  * 	user space to modify data while (or after) eBPF verdict is
1638 |  * 	being decided. This helper can be used to pull in data and to
1639 |  * 	set the start and end pointer to given values. Data will be
1640 |  * 	copied if necessary (i.e. if data was not linear and if start
1641 |  * 	and end pointers do not point to the same chunk).
1642 |  *
1643 |  * 	A call to this helper is susceptible to change the underlying
1644 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1645 |  * 	previously done by the verifier are invalidated and must be
1646 |  * 	performed again, if the helper is used in combination with
1647 |  * 	direct packet access.
1648 |  *
1649 |  * 	All values for *flags* are reserved for future usage, and must
1650 |  * 	be left at zero.
1651 |  *
1652 |  * Returns
1653 |  * 	0 on success, or a negative error in case of failure.
1654 |  */
1655 | static long (*bpf_msg_pull_data)(struct sk_msg_md *msg, __u32 start, __u32 end, __u64 flags) = (void *) 63;
1656 | 
1657 | /*
1658 |  * bpf_bind
1659 |  *
1660 |  * 	Bind the socket associated to *ctx* to the address pointed by
1661 |  * 	*addr*, of length *addr_len*. This allows for making outgoing
1662 |  * 	connection from the desired IP address, which can be useful for
1663 |  * 	example when all processes inside a cgroup should use one
1664 |  * 	single IP address on a host that has multiple IP configured.
1665 |  *
1666 |  * 	This helper works for IPv4 and IPv6, TCP and UDP sockets. The
1667 |  * 	domain (*addr*\ **->sa_family**) must be **AF_INET** (or
1668 |  * 	**AF_INET6**). It's advised to pass zero port (**sin_port**
1669 |  * 	or **sin6_port**) which triggers IP_BIND_ADDRESS_NO_PORT-like
1670 |  * 	behavior and lets the kernel efficiently pick up an unused
1671 |  * 	port as long as 4-tuple is unique. Passing non-zero port might
1672 |  * 	lead to degraded performance.
1673 |  *
1674 |  * Returns
1675 |  * 	0 on success, or a negative error in case of failure.
1676 |  */
1677 | static long (*bpf_bind)(struct bpf_sock_addr *ctx, struct sockaddr *addr, int addr_len) = (void *) 64;
1678 | 
1679 | /*
1680 |  * bpf_xdp_adjust_tail
1681 |  *
1682 |  * 	Adjust (move) *xdp_md*\ **->data_end** by *delta* bytes. It is
1683 |  * 	possible to both shrink and grow the packet tail.
1684 |  * 	Shrink done via *delta* being a negative integer.
1685 |  *
1686 |  * 	A call to this helper is susceptible to change the underlying
1687 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1688 |  * 	previously done by the verifier are invalidated and must be
1689 |  * 	performed again, if the helper is used in combination with
1690 |  * 	direct packet access.
1691 |  *
1692 |  * Returns
1693 |  * 	0 on success, or a negative error in case of failure.
1694 |  */
1695 | static long (*bpf_xdp_adjust_tail)(struct xdp_md *xdp_md, int delta) = (void *) 65;
1696 | 
1697 | /*
1698 |  * bpf_skb_get_xfrm_state
1699 |  *
1700 |  * 	Retrieve the XFRM state (IP transform framework, see also
1701 |  * 	**ip-xfrm(8)**) at *index* in XFRM "security path" for *skb*.
1702 |  *
1703 |  * 	The retrieved value is stored in the **struct bpf_xfrm_state**
1704 |  * 	pointed by *xfrm_state* and of length *size*.
1705 |  *
1706 |  * 	All values for *flags* are reserved for future usage, and must
1707 |  * 	be left at zero.
1708 |  *
1709 |  * 	This helper is available only if the kernel was compiled with
1710 |  * 	**CONFIG_XFRM** configuration option.
1711 |  *
1712 |  * Returns
1713 |  * 	0 on success, or a negative error in case of failure.
1714 |  */
1715 | static long (*bpf_skb_get_xfrm_state)(struct __sk_buff *skb, __u32 index, struct bpf_xfrm_state *xfrm_state, __u32 size, __u64 flags) = (void *) 66;
1716 | 
1717 | /*
1718 |  * bpf_get_stack
1719 |  *
1720 |  * 	Return a user or a kernel stack in bpf program provided buffer.
1721 |  * 	To achieve this, the helper needs *ctx*, which is a pointer
1722 |  * 	to the context on which the tracing program is executed.
1723 |  * 	To store the stacktrace, the bpf program provides *buf* with
1724 |  * 	a nonnegative *size*.
1725 |  *
1726 |  * 	The last argument, *flags*, holds the number of stack frames to
1727 |  * 	skip (from 0 to 255), masked with
1728 |  * 	**BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
1729 |  * 	the following flags:
1730 |  *
1731 |  * 	**BPF_F_USER_STACK**
1732 |  * 		Collect a user space stack instead of a kernel stack.
1733 |  * 	**BPF_F_USER_BUILD_ID**
1734 |  * 		Collect buildid+offset instead of ips for user stack,
1735 |  * 		only valid if **BPF_F_USER_STACK** is also specified.
1736 |  *
1737 |  * 	**bpf_get_stack**\ () can collect up to
1738 |  * 	**PERF_MAX_STACK_DEPTH** both kernel and user frames, subject
1739 |  * 	to sufficient large buffer size. Note that
1740 |  * 	this limit can be controlled with the **sysctl** program, and
1741 |  * 	that it should be manually increased in order to profile long
1742 |  * 	user stacks (such as stacks for Java programs). To do so, use:
1743 |  *
1744 |  * 	::
1745 |  *
1746 |  * 		# sysctl kernel.perf_event_max_stack=<new value>
1747 |  *
1748 |  * Returns
1749 |  * 	A non-negative value equal to or less than *size* on success,
1750 |  * 	or a negative error in case of failure.
1751 |  */
1752 | static long (*bpf_get_stack)(void *ctx, void *buf, __u32 size, __u64 flags) = (void *) 67;
1753 | 
1754 | /*
1755 |  * bpf_skb_load_bytes_relative
1756 |  *
1757 |  * 	This helper is similar to **bpf_skb_load_bytes**\ () in that
1758 |  * 	it provides an easy way to load *len* bytes from *offset*
1759 |  * 	from the packet associated to *skb*, into the buffer pointed
1760 |  * 	by *to*. The difference to **bpf_skb_load_bytes**\ () is that
1761 |  * 	a fifth argument *start_header* exists in order to select a
1762 |  * 	base offset to start from. *start_header* can be one of:
1763 |  *
1764 |  * 	**BPF_HDR_START_MAC**
1765 |  * 		Base offset to load data from is *skb*'s mac header.
1766 |  * 	**BPF_HDR_START_NET**
1767 |  * 		Base offset to load data from is *skb*'s network header.
1768 |  *
1769 |  * 	In general, "direct packet access" is the preferred method to
1770 |  * 	access packet data, however, this helper is in particular useful
1771 |  * 	in socket filters where *skb*\ **->data** does not always point
1772 |  * 	to the start of the mac header and where "direct packet access"
1773 |  * 	is not available.
1774 |  *
1775 |  * Returns
1776 |  * 	0 on success, or a negative error in case of failure.
1777 |  */
1778 | static long (*bpf_skb_load_bytes_relative)(const void *skb, __u32 offset, void *to, __u32 len, __u32 start_header) = (void *) 68;
1779 | 
1780 | /*
1781 |  * bpf_fib_lookup
1782 |  *
1783 |  * 	Do FIB lookup in kernel tables using parameters in *params*.
1784 |  * 	If lookup is successful and result shows packet is to be
1785 |  * 	forwarded, the neighbor tables are searched for the nexthop.
1786 |  * 	If successful (ie., FIB lookup shows forwarding and nexthop
1787 |  * 	is resolved), the nexthop address is returned in ipv4_dst
1788 |  * 	or ipv6_dst based on family, smac is set to mac address of
1789 |  * 	egress device, dmac is set to nexthop mac address, rt_metric
1790 |  * 	is set to metric from route (IPv4/IPv6 only), and ifindex
1791 |  * 	is set to the device index of the nexthop from the FIB lookup.
1792 |  *
1793 |  * 	*plen* argument is the size of the passed in struct.
1794 |  * 	*flags* argument can be a combination of one or more of the
1795 |  * 	following values:
1796 |  *
1797 |  * 	**BPF_FIB_LOOKUP_DIRECT**
1798 |  * 		Do a direct table lookup vs full lookup using FIB
1799 |  * 		rules.
1800 |  * 	**BPF_FIB_LOOKUP_OUTPUT**
1801 |  * 		Perform lookup from an egress perspective (default is
1802 |  * 		ingress).
1803 |  *
1804 |  * 	*ctx* is either **struct xdp_md** for XDP programs or
1805 |  * 	**struct sk_buff** tc cls_act programs.
1806 |  *
1807 |  * Returns
1808 |  * 	* < 0 if any input argument is invalid
1809 |  * 	*   0 on success (packet is forwarded, nexthop neighbor exists)
1810 |  * 	* > 0 one of **BPF_FIB_LKUP_RET_** codes explaining why the
1811 |  * 	  packet is not forwarded or needs assist from full stack
1812 |  *
1813 |  * 	If lookup fails with BPF_FIB_LKUP_RET_FRAG_NEEDED, then the MTU
1814 |  * 	was exceeded and output params->mtu_result contains the MTU.
1815 |  */
1816 | static long (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params, int plen, __u32 flags) = (void *) 69;
1817 | 
1818 | /*
1819 |  * bpf_sock_hash_update
1820 |  *
1821 |  * 	Add an entry to, or update a sockhash *map* referencing sockets.
1822 |  * 	The *skops* is used as a new value for the entry associated to
1823 |  * 	*key*. *flags* is one of:
1824 |  *
1825 |  * 	**BPF_NOEXIST**
1826 |  * 		The entry for *key* must not exist in the map.
1827 |  * 	**BPF_EXIST**
1828 |  * 		The entry for *key* must already exist in the map.
1829 |  * 	**BPF_ANY**
1830 |  * 		No condition on the existence of the entry for *key*.
1831 |  *
1832 |  * 	If the *map* has eBPF programs (parser and verdict), those will
1833 |  * 	be inherited by the socket being added. If the socket is
1834 |  * 	already attached to eBPF programs, this results in an error.
1835 |  *
1836 |  * Returns
1837 |  * 	0 on success, or a negative error in case of failure.
1838 |  */
1839 | static long (*bpf_sock_hash_update)(struct bpf_sock_ops *skops, void *map, void *key, __u64 flags) = (void *) 70;
1840 | 
1841 | /*
1842 |  * bpf_msg_redirect_hash
1843 |  *
1844 |  * 	This helper is used in programs implementing policies at the
1845 |  * 	socket level. If the message *msg* is allowed to pass (i.e. if
1846 |  * 	the verdict eBPF program returns **SK_PASS**), redirect it to
1847 |  * 	the socket referenced by *map* (of type
1848 |  * 	**BPF_MAP_TYPE_SOCKHASH**) using hash *key*. Both ingress and
1849 |  * 	egress interfaces can be used for redirection. The
1850 |  * 	**BPF_F_INGRESS** value in *flags* is used to make the
1851 |  * 	distinction (ingress path is selected if the flag is present,
1852 |  * 	egress path otherwise). This is the only flag supported for now.
1853 |  *
1854 |  * Returns
1855 |  * 	**SK_PASS** on success, or **SK_DROP** on error.
1856 |  */
1857 | static long (*bpf_msg_redirect_hash)(struct sk_msg_md *msg, void *map, void *key, __u64 flags) = (void *) 71;
1858 | 
1859 | /*
1860 |  * bpf_sk_redirect_hash
1861 |  *
1862 |  * 	This helper is used in programs implementing policies at the
1863 |  * 	skb socket level. If the sk_buff *skb* is allowed to pass (i.e.
1864 |  * 	if the verdict eBPF program returns **SK_PASS**), redirect it
1865 |  * 	to the socket referenced by *map* (of type
1866 |  * 	**BPF_MAP_TYPE_SOCKHASH**) using hash *key*. Both ingress and
1867 |  * 	egress interfaces can be used for redirection. The
1868 |  * 	**BPF_F_INGRESS** value in *flags* is used to make the
1869 |  * 	distinction (ingress path is selected if the flag is present,
1870 |  * 	egress otherwise). This is the only flag supported for now.
1871 |  *
1872 |  * Returns
1873 |  * 	**SK_PASS** on success, or **SK_DROP** on error.
1874 |  */
1875 | static long (*bpf_sk_redirect_hash)(struct __sk_buff *skb, void *map, void *key, __u64 flags) = (void *) 72;
1876 | 
1877 | /*
1878 |  * bpf_lwt_push_encap
1879 |  *
1880 |  * 	Encapsulate the packet associated to *skb* within a Layer 3
1881 |  * 	protocol header. This header is provided in the buffer at
1882 |  * 	address *hdr*, with *len* its size in bytes. *type* indicates
1883 |  * 	the protocol of the header and can be one of:
1884 |  *
1885 |  * 	**BPF_LWT_ENCAP_SEG6**
1886 |  * 		IPv6 encapsulation with Segment Routing Header
1887 |  * 		(**struct ipv6_sr_hdr**). *hdr* only contains the SRH,
1888 |  * 		the IPv6 header is computed by the kernel.
1889 |  * 	**BPF_LWT_ENCAP_SEG6_INLINE**
1890 |  * 		Only works if *skb* contains an IPv6 packet. Insert a
1891 |  * 		Segment Routing Header (**struct ipv6_sr_hdr**) inside
1892 |  * 		the IPv6 header.
1893 |  * 	**BPF_LWT_ENCAP_IP**
1894 |  * 		IP encapsulation (GRE/GUE/IPIP/etc). The outer header
1895 |  * 		must be IPv4 or IPv6, followed by zero or more
1896 |  * 		additional headers, up to **LWT_BPF_MAX_HEADROOM**
1897 |  * 		total bytes in all prepended headers. Please note that
1898 |  * 		if **skb_is_gso**\ (*skb*) is true, no more than two
1899 |  * 		headers can be prepended, and the inner header, if
1900 |  * 		present, should be either GRE or UDP/GUE.
1901 |  *
1902 |  * 	**BPF_LWT_ENCAP_SEG6**\ \* types can be called by BPF programs
1903 |  * 	of type **BPF_PROG_TYPE_LWT_IN**; **BPF_LWT_ENCAP_IP** type can
1904 |  * 	be called by bpf programs of types **BPF_PROG_TYPE_LWT_IN** and
1905 |  * 	**BPF_PROG_TYPE_LWT_XMIT**.
1906 |  *
1907 |  * 	A call to this helper is susceptible to change the underlying
1908 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1909 |  * 	previously done by the verifier are invalidated and must be
1910 |  * 	performed again, if the helper is used in combination with
1911 |  * 	direct packet access.
1912 |  *
1913 |  * Returns
1914 |  * 	0 on success, or a negative error in case of failure.
1915 |  */
1916 | static long (*bpf_lwt_push_encap)(struct __sk_buff *skb, __u32 type, void *hdr, __u32 len) = (void *) 73;
1917 | 
1918 | /*
1919 |  * bpf_lwt_seg6_store_bytes
1920 |  *
1921 |  * 	Store *len* bytes from address *from* into the packet
1922 |  * 	associated to *skb*, at *offset*. Only the flags, tag and TLVs
1923 |  * 	inside the outermost IPv6 Segment Routing Header can be
1924 |  * 	modified through this helper.
1925 |  *
1926 |  * 	A call to this helper is susceptible to change the underlying
1927 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1928 |  * 	previously done by the verifier are invalidated and must be
1929 |  * 	performed again, if the helper is used in combination with
1930 |  * 	direct packet access.
1931 |  *
1932 |  * Returns
1933 |  * 	0 on success, or a negative error in case of failure.
1934 |  */
1935 | static long (*bpf_lwt_seg6_store_bytes)(struct __sk_buff *skb, __u32 offset, const void *from, __u32 len) = (void *) 74;
1936 | 
1937 | /*
1938 |  * bpf_lwt_seg6_adjust_srh
1939 |  *
1940 |  * 	Adjust the size allocated to TLVs in the outermost IPv6
1941 |  * 	Segment Routing Header contained in the packet associated to
1942 |  * 	*skb*, at position *offset* by *delta* bytes. Only offsets
1943 |  * 	after the segments are accepted. *delta* can be as well
1944 |  * 	positive (growing) as negative (shrinking).
1945 |  *
1946 |  * 	A call to this helper is susceptible to change the underlying
1947 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1948 |  * 	previously done by the verifier are invalidated and must be
1949 |  * 	performed again, if the helper is used in combination with
1950 |  * 	direct packet access.
1951 |  *
1952 |  * Returns
1953 |  * 	0 on success, or a negative error in case of failure.
1954 |  */
1955 | static long (*bpf_lwt_seg6_adjust_srh)(struct __sk_buff *skb, __u32 offset, __s32 delta) = (void *) 75;
1956 | 
1957 | /*
1958 |  * bpf_lwt_seg6_action
1959 |  *
1960 |  * 	Apply an IPv6 Segment Routing action of type *action* to the
1961 |  * 	packet associated to *skb*. Each action takes a parameter
1962 |  * 	contained at address *param*, and of length *param_len* bytes.
1963 |  * 	*action* can be one of:
1964 |  *
1965 |  * 	**SEG6_LOCAL_ACTION_END_X**
1966 |  * 		End.X action: Endpoint with Layer-3 cross-connect.
1967 |  * 		Type of *param*: **struct in6_addr**.
1968 |  * 	**SEG6_LOCAL_ACTION_END_T**
1969 |  * 		End.T action: Endpoint with specific IPv6 table lookup.
1970 |  * 		Type of *param*: **int**.
1971 |  * 	**SEG6_LOCAL_ACTION_END_B6**
1972 |  * 		End.B6 action: Endpoint bound to an SRv6 policy.
1973 |  * 		Type of *param*: **struct ipv6_sr_hdr**.
1974 |  * 	**SEG6_LOCAL_ACTION_END_B6_ENCAP**
1975 |  * 		End.B6.Encap action: Endpoint bound to an SRv6
1976 |  * 		encapsulation policy.
1977 |  * 		Type of *param*: **struct ipv6_sr_hdr**.
1978 |  *
1979 |  * 	A call to this helper is susceptible to change the underlying
1980 |  * 	packet buffer. Therefore, at load time, all checks on pointers
1981 |  * 	previously done by the verifier are invalidated and must be
1982 |  * 	performed again, if the helper is used in combination with
1983 |  * 	direct packet access.
1984 |  *
1985 |  * Returns
1986 |  * 	0 on success, or a negative error in case of failure.
1987 |  */
1988 | static long (*bpf_lwt_seg6_action)(struct __sk_buff *skb, __u32 action, void *param, __u32 param_len) = (void *) 76;
1989 | 
1990 | /*
1991 |  * bpf_rc_repeat
1992 |  *
1993 |  * 	This helper is used in programs implementing IR decoding, to
1994 |  * 	report a successfully decoded repeat key message. This delays
1995 |  * 	the generation of a key up event for previously generated
1996 |  * 	key down event.
1997 |  *
1998 |  * 	Some IR protocols like NEC have a special IR message for
1999 |  * 	repeating last button, for when a button is held down.
2000 |  *
2001 |  * 	The *ctx* should point to the lirc sample as passed into
2002 |  * 	the program.
2003 |  *
2004 |  * 	This helper is only available is the kernel was compiled with
2005 |  * 	the **CONFIG_BPF_LIRC_MODE2** configuration option set to
2006 |  * 	"**y**".
2007 |  *
2008 |  * Returns
2009 |  * 	0
2010 |  */
2011 | static long (*bpf_rc_repeat)(void *ctx) = (void *) 77;
2012 | 
2013 | /*
2014 |  * bpf_rc_keydown
2015 |  *
2016 |  * 	This helper is used in programs implementing IR decoding, to
2017 |  * 	report a successfully decoded key press with *scancode*,
2018 |  * 	*toggle* value in the given *protocol*. The scancode will be
2019 |  * 	translated to a keycode using the rc keymap, and reported as
2020 |  * 	an input key down event. After a period a key up event is
2021 |  * 	generated. This period can be extended by calling either
2022 |  * 	**bpf_rc_keydown**\ () again with the same values, or calling
2023 |  * 	**bpf_rc_repeat**\ ().
2024 |  *
2025 |  * 	Some protocols include a toggle bit, in case the button was
2026 |  * 	released and pressed again between consecutive scancodes.
2027 |  *
2028 |  * 	The *ctx* should point to the lirc sample as passed into
2029 |  * 	the program.
2030 |  *
2031 |  * 	The *protocol* is the decoded protocol number (see
2032 |  * 	**enum rc_proto** for some predefined values).
2033 |  *
2034 |  * 	This helper is only available is the kernel was compiled with
2035 |  * 	the **CONFIG_BPF_LIRC_MODE2** configuration option set to
2036 |  * 	"**y**".
2037 |  *
2038 |  * Returns
2039 |  * 	0
2040 |  */
2041 | static long (*bpf_rc_keydown)(void *ctx, __u32 protocol, __u64 scancode, __u32 toggle) = (void *) 78;
2042 | 
2043 | /*
2044 |  * bpf_skb_cgroup_id
2045 |  *
2046 |  * 	Return the cgroup v2 id of the socket associated with the *skb*.
2047 |  * 	This is roughly similar to the **bpf_get_cgroup_classid**\ ()
2048 |  * 	helper for cgroup v1 by providing a tag resp. identifier that
2049 |  * 	can be matched on or used for map lookups e.g. to implement
2050 |  * 	policy. The cgroup v2 id of a given path in the hierarchy is
2051 |  * 	exposed in user space through the f_handle API in order to get
2052 |  * 	to the same 64-bit id.
2053 |  *
2054 |  * 	This helper can be used on TC egress path, but not on ingress,
2055 |  * 	and is available only if the kernel was compiled with the
2056 |  * 	**CONFIG_SOCK_CGROUP_DATA** configuration option.
2057 |  *
2058 |  * Returns
2059 |  * 	The id is returned or 0 in case the id could not be retrieved.
2060 |  */
2061 | static __u64 (*bpf_skb_cgroup_id)(struct __sk_buff *skb) = (void *) 79;
2062 | 
2063 | /*
2064 |  * bpf_get_current_cgroup_id
2065 |  *
2066 |  *
2067 |  * Returns
2068 |  * 	A 64-bit integer containing the current cgroup id based
2069 |  * 	on the cgroup within which the current task is running.
2070 |  */
2071 | static __u64 (*bpf_get_current_cgroup_id)(void) = (void *) 80;
2072 | 
2073 | /*
2074 |  * bpf_get_local_storage
2075 |  *
2076 |  * 	Get the pointer to the local storage area.
2077 |  * 	The type and the size of the local storage is defined
2078 |  * 	by the *map* argument.
2079 |  * 	The *flags* meaning is specific for each map type,
2080 |  * 	and has to be 0 for cgroup local storage.
2081 |  *
2082 |  * 	Depending on the BPF program type, a local storage area
2083 |  * 	can be shared between multiple instances of the BPF program,
2084 |  * 	running simultaneously.
2085 |  *
2086 |  * 	A user should care about the synchronization by himself.
2087 |  * 	For example, by using the **BPF_ATOMIC** instructions to alter
2088 |  * 	the shared data.
2089 |  *
2090 |  * Returns
2091 |  * 	A pointer to the local storage area.
2092 |  */
2093 | static void *(*bpf_get_local_storage)(void *map, __u64 flags) = (void *) 81;
2094 | 
2095 | /*
2096 |  * bpf_sk_select_reuseport
2097 |  *
2098 |  * 	Select a **SO_REUSEPORT** socket from a
2099 |  * 	**BPF_MAP_TYPE_REUSEPORT_SOCKARRAY** *map*.
2100 |  * 	It checks the selected socket is matching the incoming
2101 |  * 	request in the socket buffer.
2102 |  *
2103 |  * Returns
2104 |  * 	0 on success, or a negative error in case of failure.
2105 |  */
2106 | static long (*bpf_sk_select_reuseport)(struct sk_reuseport_md *reuse, void *map, void *key, __u64 flags) = (void *) 82;
2107 | 
2108 | /*
2109 |  * bpf_skb_ancestor_cgroup_id
2110 |  *
2111 |  * 	Return id of cgroup v2 that is ancestor of cgroup associated
2112 |  * 	with the *skb* at the *ancestor_level*.  The root cgroup is at
2113 |  * 	*ancestor_level* zero and each step down the hierarchy
2114 |  * 	increments the level. If *ancestor_level* == level of cgroup
2115 |  * 	associated with *skb*, then return value will be same as that
2116 |  * 	of **bpf_skb_cgroup_id**\ ().
2117 |  *
2118 |  * 	The helper is useful to implement policies based on cgroups
2119 |  * 	that are upper in hierarchy than immediate cgroup associated
2120 |  * 	with *skb*.
2121 |  *
2122 |  * 	The format of returned id and helper limitations are same as in
2123 |  * 	**bpf_skb_cgroup_id**\ ().
2124 |  *
2125 |  * Returns
2126 |  * 	The id is returned or 0 in case the id could not be retrieved.
2127 |  */
2128 | static __u64 (*bpf_skb_ancestor_cgroup_id)(struct __sk_buff *skb, int ancestor_level) = (void *) 83;
2129 | 
2130 | /*
2131 |  * bpf_sk_lookup_tcp
2132 |  *
2133 |  * 	Look for TCP socket matching *tuple*, optionally in a child
2134 |  * 	network namespace *netns*. The return value must be checked,
2135 |  * 	and if non-**NULL**, released via **bpf_sk_release**\ ().
2136 |  *
2137 |  * 	The *ctx* should point to the context of the program, such as
2138 |  * 	the skb or socket (depending on the hook in use). This is used
2139 |  * 	to determine the base network namespace for the lookup.
2140 |  *
2141 |  * 	*tuple_size* must be one of:
2142 |  *
2143 |  * 	**sizeof**\ (*tuple*\ **->ipv4**)
2144 |  * 		Look for an IPv4 socket.
2145 |  * 	**sizeof**\ (*tuple*\ **->ipv6**)
2146 |  * 		Look for an IPv6 socket.
2147 |  *
2148 |  * 	If the *netns* is a negative signed 32-bit integer, then the
2149 |  * 	socket lookup table in the netns associated with the *ctx*
2150 |  * 	will be used. For the TC hooks, this is the netns of the device
2151 |  * 	in the skb. For socket hooks, this is the netns of the socket.
2152 |  * 	If *netns* is any other signed 32-bit value greater than or
2153 |  * 	equal to zero then it specifies the ID of the netns relative to
2154 |  * 	the netns associated with the *ctx*. *netns* values beyond the
2155 |  * 	range of 32-bit integers are reserved for future use.
2156 |  *
2157 |  * 	All values for *flags* are reserved for future usage, and must
2158 |  * 	be left at zero.
2159 |  *
2160 |  * 	This helper is available only if the kernel was compiled with
2161 |  * 	**CONFIG_NET** configuration option.
2162 |  *
2163 |  * Returns
2164 |  * 	Pointer to **struct bpf_sock**, or **NULL** in case of failure.
2165 |  * 	For sockets with reuseport option, the **struct bpf_sock**
2166 |  * 	result is from *reuse*\ **->socks**\ [] using the hash of the
2167 |  * 	tuple.
2168 |  */
2169 | static struct bpf_sock *(*bpf_sk_lookup_tcp)(void *ctx, struct bpf_sock_tuple *tuple, __u32 tuple_size, __u64 netns, __u64 flags) = (void *) 84;
2170 | 
2171 | /*
2172 |  * bpf_sk_lookup_udp
2173 |  *
2174 |  * 	Look for UDP socket matching *tuple*, optionally in a child
2175 |  * 	network namespace *netns*. The return value must be checked,
2176 |  * 	and if non-**NULL**, released via **bpf_sk_release**\ ().
2177 |  *
2178 |  * 	The *ctx* should point to the context of the program, such as
2179 |  * 	the skb or socket (depending on the hook in use). This is used
2180 |  * 	to determine the base network namespace for the lookup.
2181 |  *
2182 |  * 	*tuple_size* must be one of:
2183 |  *
2184 |  * 	**sizeof**\ (*tuple*\ **->ipv4**)
2185 |  * 		Look for an IPv4 socket.
2186 |  * 	**sizeof**\ (*tuple*\ **->ipv6**)
2187 |  * 		Look for an IPv6 socket.
2188 |  *
2189 |  * 	If the *netns* is a negative signed 32-bit integer, then the
2190 |  * 	socket lookup table in the netns associated with the *ctx*
2191 |  * 	will be used. For the TC hooks, this is the netns of the device
2192 |  * 	in the skb. For socket hooks, this is the netns of the socket.
2193 |  * 	If *netns* is any other signed 32-bit value greater than or
2194 |  * 	equal to zero then it specifies the ID of the netns relative to
2195 |  * 	the netns associated with the *ctx*. *netns* values beyond the
2196 |  * 	range of 32-bit integers are reserved for future use.
2197 |  *
2198 |  * 	All values for *flags* are reserved for future usage, and must
2199 |  * 	be left at zero.
2200 |  *
2201 |  * 	This helper is available only if the kernel was compiled with
2202 |  * 	**CONFIG_NET** configuration option.
2203 |  *
2204 |  * Returns
2205 |  * 	Pointer to **struct bpf_sock**, or **NULL** in case of failure.
2206 |  * 	For sockets with reuseport option, the **struct bpf_sock**
2207 |  * 	result is from *reuse*\ **->socks**\ [] using the hash of the
2208 |  * 	tuple.
2209 |  */
2210 | static struct bpf_sock *(*bpf_sk_lookup_udp)(void *ctx, struct bpf_sock_tuple *tuple, __u32 tuple_size, __u64 netns, __u64 flags) = (void *) 85;
2211 | 
2212 | /*
2213 |  * bpf_sk_release
2214 |  *
2215 |  * 	Release the reference held by *sock*. *sock* must be a
2216 |  * 	non-**NULL** pointer that was returned from
2217 |  * 	**bpf_sk_lookup_xxx**\ ().
2218 |  *
2219 |  * Returns
2220 |  * 	0 on success, or a negative error in case of failure.
2221 |  */
2222 | static long (*bpf_sk_release)(void *sock) = (void *) 86;
2223 | 
2224 | /*
2225 |  * bpf_map_push_elem
2226 |  *
2227 |  * 	Push an element *value* in *map*. *flags* is one of:
2228 |  *
2229 |  * 	**BPF_EXIST**
2230 |  * 		If the queue/stack is full, the oldest element is
2231 |  * 		removed to make room for this.
2232 |  *
2233 |  * Returns
2234 |  * 	0 on success, or a negative error in case of failure.
2235 |  */
2236 | static long (*bpf_map_push_elem)(void *map, const void *value, __u64 flags) = (void *) 87;
2237 | 
2238 | /*
2239 |  * bpf_map_pop_elem
2240 |  *
2241 |  * 	Pop an element from *map*.
2242 |  *
2243 |  * Returns
2244 |  * 	0 on success, or a negative error in case of failure.
2245 |  */
2246 | static long (*bpf_map_pop_elem)(void *map, void *value) = (void *) 88;
2247 | 
2248 | /*
2249 |  * bpf_map_peek_elem
2250 |  *
2251 |  * 	Get an element from *map* without removing it.
2252 |  *
2253 |  * Returns
2254 |  * 	0 on success, or a negative error in case of failure.
2255 |  */
2256 | static long (*bpf_map_peek_elem)(void *map, void *value) = (void *) 89;
2257 | 
2258 | /*
2259 |  * bpf_msg_push_data
2260 |  *
2261 |  * 	For socket policies, insert *len* bytes into *msg* at offset
2262 |  * 	*start*.
2263 |  *
2264 |  * 	If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
2265 |  * 	*msg* it may want to insert metadata or options into the *msg*.
2266 |  * 	This can later be read and used by any of the lower layer BPF
2267 |  * 	hooks.
2268 |  *
2269 |  * 	This helper may fail if under memory pressure (a malloc
2270 |  * 	fails) in these cases BPF programs will get an appropriate
2271 |  * 	error and BPF programs will need to handle them.
2272 |  *
2273 |  * Returns
2274 |  * 	0 on success, or a negative error in case of failure.
2275 |  */
2276 | static long (*bpf_msg_push_data)(struct sk_msg_md *msg, __u32 start, __u32 len, __u64 flags) = (void *) 90;
2277 | 
2278 | /*
2279 |  * bpf_msg_pop_data
2280 |  *
2281 |  * 	Will remove *len* bytes from a *msg* starting at byte *start*.
2282 |  * 	This may result in **ENOMEM** errors under certain situations if
2283 |  * 	an allocation and copy are required due to a full ring buffer.
2284 |  * 	However, the helper will try to avoid doing the allocation
2285 |  * 	if possible. Other errors can occur if input parameters are
2286 |  * 	invalid either due to *start* byte not being valid part of *msg*
2287 |  * 	payload and/or *pop* value being to large.
2288 |  *
2289 |  * Returns
2290 |  * 	0 on success, or a negative error in case of failure.
2291 |  */
2292 | static long (*bpf_msg_pop_data)(struct sk_msg_md *msg, __u32 start, __u32 len, __u64 flags) = (void *) 91;
2293 | 
2294 | /*
2295 |  * bpf_rc_pointer_rel
2296 |  *
2297 |  * 	This helper is used in programs implementing IR decoding, to
2298 |  * 	report a successfully decoded pointer movement.
2299 |  *
2300 |  * 	The *ctx* should point to the lirc sample as passed into
2301 |  * 	the program.
2302 |  *
2303 |  * 	This helper is only available is the kernel was compiled with
2304 |  * 	the **CONFIG_BPF_LIRC_MODE2** configuration option set to
2305 |  * 	"**y**".
2306 |  *
2307 |  * Returns
2308 |  * 	0
2309 |  */
2310 | static long (*bpf_rc_pointer_rel)(void *ctx, __s32 rel_x, __s32 rel_y) = (void *) 92;
2311 | 
2312 | /*
2313 |  * bpf_spin_lock
2314 |  *
2315 |  * 	Acquire a spinlock represented by the pointer *lock*, which is
2316 |  * 	stored as part of a value of a map. Taking the lock allows to
2317 |  * 	safely update the rest of the fields in that value. The
2318 |  * 	spinlock can (and must) later be released with a call to
2319 |  * 	**bpf_spin_unlock**\ (\ *lock*\ ).
2320 |  *
2321 |  * 	Spinlocks in BPF programs come with a number of restrictions
2322 |  * 	and constraints:
2323 |  *
2324 |  * 	* **bpf_spin_lock** objects are only allowed inside maps of
2325 |  * 	  types **BPF_MAP_TYPE_HASH** and **BPF_MAP_TYPE_ARRAY** (this
2326 |  * 	  list could be extended in the future).
2327 |  * 	* BTF description of the map is mandatory.
2328 |  * 	* The BPF program can take ONE lock at a time, since taking two
2329 |  * 	  or more could cause dead locks.
2330 |  * 	* Only one **struct bpf_spin_lock** is allowed per map element.
2331 |  * 	* When the lock is taken, calls (either BPF to BPF or helpers)
2332 |  * 	  are not allowed.
2333 |  * 	* The **BPF_LD_ABS** and **BPF_LD_IND** instructions are not
2334 |  * 	  allowed inside a spinlock-ed region.
2335 |  * 	* The BPF program MUST call **bpf_spin_unlock**\ () to release
2336 |  * 	  the lock, on all execution paths, before it returns.
2337 |  * 	* The BPF program can access **struct bpf_spin_lock** only via
2338 |  * 	  the **bpf_spin_lock**\ () and **bpf_spin_unlock**\ ()
2339 |  * 	  helpers. Loading or storing data into the **struct
2340 |  * 	  bpf_spin_lock** *lock*\ **;** field of a map is not allowed.
2341 |  * 	* To use the **bpf_spin_lock**\ () helper, the BTF description
2342 |  * 	  of the map value must be a struct and have **struct
2343 |  * 	  bpf_spin_lock** *anyname*\ **;** field at the top level.
2344 |  * 	  Nested lock inside another struct is not allowed.
2345 |  * 	* The **struct bpf_spin_lock** *lock* field in a map value must
2346 |  * 	  be aligned on a multiple of 4 bytes in that value.
2347 |  * 	* Syscall with command **BPF_MAP_LOOKUP_ELEM** does not copy
2348 |  * 	  the **bpf_spin_lock** field to user space.
2349 |  * 	* Syscall with command **BPF_MAP_UPDATE_ELEM**, or update from
2350 |  * 	  a BPF program, do not update the **bpf_spin_lock** field.
2351 |  * 	* **bpf_spin_lock** cannot be on the stack or inside a
2352 |  * 	  networking packet (it can only be inside of a map values).
2353 |  * 	* **bpf_spin_lock** is available to root only.
2354 |  * 	* Tracing programs and socket filter programs cannot use
2355 |  * 	  **bpf_spin_lock**\ () due to insufficient preemption checks
2356 |  * 	  (but this may change in the future).
2357 |  * 	* **bpf_spin_lock** is not allowed in inner maps of map-in-map.
2358 |  *
2359 |  * Returns
2360 |  * 	0
2361 |  */
2362 | static long (*bpf_spin_lock)(struct bpf_spin_lock *lock) = (void *) 93;
2363 | 
2364 | /*
2365 |  * bpf_spin_unlock
2366 |  *
2367 |  * 	Release the *lock* previously locked by a call to
2368 |  * 	**bpf_spin_lock**\ (\ *lock*\ ).
2369 |  *
2370 |  * Returns
2371 |  * 	0
2372 |  */
2373 | static long (*bpf_spin_unlock)(struct bpf_spin_lock *lock) = (void *) 94;
2374 | 
2375 | /*
2376 |  * bpf_sk_fullsock
2377 |  *
2378 |  * 	This helper gets a **struct bpf_sock** pointer such
2379 |  * 	that all the fields in this **bpf_sock** can be accessed.
2380 |  *
2381 |  * Returns
2382 |  * 	A **struct bpf_sock** pointer on success, or **NULL** in
2383 |  * 	case of failure.
2384 |  */
2385 | static struct bpf_sock *(*bpf_sk_fullsock)(struct bpf_sock *sk) = (void *) 95;
2386 | 
2387 | /*
2388 |  * bpf_tcp_sock
2389 |  *
2390 |  * 	This helper gets a **struct bpf_tcp_sock** pointer from a
2391 |  * 	**struct bpf_sock** pointer.
2392 |  *
2393 |  * Returns
2394 |  * 	A **struct bpf_tcp_sock** pointer on success, or **NULL** in
2395 |  * 	case of failure.
2396 |  */
2397 | static struct bpf_tcp_sock *(*bpf_tcp_sock)(struct bpf_sock *sk) = (void *) 96;
2398 | 
2399 | /*
2400 |  * bpf_skb_ecn_set_ce
2401 |  *
2402 |  * 	Set ECN (Explicit Congestion Notification) field of IP header
2403 |  * 	to **CE** (Congestion Encountered) if current value is **ECT**
2404 |  * 	(ECN Capable Transport). Otherwise, do nothing. Works with IPv6
2405 |  * 	and IPv4.
2406 |  *
2407 |  * Returns
2408 |  * 	1 if the **CE** flag is set (either by the current helper call
2409 |  * 	or because it was already present), 0 if it is not set.
2410 |  */
2411 | static long (*bpf_skb_ecn_set_ce)(struct __sk_buff *skb) = (void *) 97;
2412 | 
2413 | /*
2414 |  * bpf_get_listener_sock
2415 |  *
2416 |  * 	Return a **struct bpf_sock** pointer in **TCP_LISTEN** state.
2417 |  * 	**bpf_sk_release**\ () is unnecessary and not allowed.
2418 |  *
2419 |  * Returns
2420 |  * 	A **struct bpf_sock** pointer on success, or **NULL** in
2421 |  * 	case of failure.
2422 |  */
2423 | static struct bpf_sock *(*bpf_get_listener_sock)(struct bpf_sock *sk) = (void *) 98;
2424 | 
2425 | /*
2426 |  * bpf_skc_lookup_tcp
2427 |  *
2428 |  * 	Look for TCP socket matching *tuple*, optionally in a child
2429 |  * 	network namespace *netns*. The return value must be checked,
2430 |  * 	and if non-**NULL**, released via **bpf_sk_release**\ ().
2431 |  *
2432 |  * 	This function is identical to **bpf_sk_lookup_tcp**\ (), except
2433 |  * 	that it also returns timewait or request sockets. Use
2434 |  * 	**bpf_sk_fullsock**\ () or **bpf_tcp_sock**\ () to access the
2435 |  * 	full structure.
2436 |  *
2437 |  * 	This helper is available only if the kernel was compiled with
2438 |  * 	**CONFIG_NET** configuration option.
2439 |  *
2440 |  * Returns
2441 |  * 	Pointer to **struct bpf_sock**, or **NULL** in case of failure.
2442 |  * 	For sockets with reuseport option, the **struct bpf_sock**
2443 |  * 	result is from *reuse*\ **->socks**\ [] using the hash of the
2444 |  * 	tuple.
2445 |  */
2446 | static struct bpf_sock *(*bpf_skc_lookup_tcp)(void *ctx, struct bpf_sock_tuple *tuple, __u32 tuple_size, __u64 netns, __u64 flags) = (void *) 99;
2447 | 
2448 | /*
2449 |  * bpf_tcp_check_syncookie
2450 |  *
2451 |  * 	Check whether *iph* and *th* contain a valid SYN cookie ACK for
2452 |  * 	the listening socket in *sk*.
2453 |  *
2454 |  * 	*iph* points to the start of the IPv4 or IPv6 header, while
2455 |  * 	*iph_len* contains **sizeof**\ (**struct iphdr**) or
2456 |  * 	**sizeof**\ (**struct ip6hdr**).
2457 |  *
2458 |  * 	*th* points to the start of the TCP header, while *th_len*
2459 |  * 	contains **sizeof**\ (**struct tcphdr**).
2460 |  *
2461 |  * Returns
2462 |  * 	0 if *iph* and *th* are a valid SYN cookie ACK, or a negative
2463 |  * 	error otherwise.
2464 |  */
2465 | static long (*bpf_tcp_check_syncookie)(void *sk, void *iph, __u32 iph_len, struct tcphdr *th, __u32 th_len) = (void *) 100;
2466 | 
2467 | /*
2468 |  * bpf_sysctl_get_name
2469 |  *
2470 |  * 	Get name of sysctl in /proc/sys/ and copy it into provided by
2471 |  * 	program buffer *buf* of size *buf_len*.
2472 |  *
2473 |  * 	The buffer is always NUL terminated, unless it's zero-sized.
2474 |  *
2475 |  * 	If *flags* is zero, full name (e.g. "net/ipv4/tcp_mem") is
2476 |  * 	copied. Use **BPF_F_SYSCTL_BASE_NAME** flag to copy base name
2477 |  * 	only (e.g. "tcp_mem").
2478 |  *
2479 |  * Returns
2480 |  * 	Number of character copied (not including the trailing NUL).
2481 |  *
2482 |  * 	**-E2BIG** if the buffer wasn't big enough (*buf* will contain
2483 |  * 	truncated name in this case).
2484 |  */
2485 | static long (*bpf_sysctl_get_name)(struct bpf_sysctl *ctx, char *buf, unsigned long buf_len, __u64 flags) = (void *) 101;
2486 | 
2487 | /*
2488 |  * bpf_sysctl_get_current_value
2489 |  *
2490 |  * 	Get current value of sysctl as it is presented in /proc/sys
2491 |  * 	(incl. newline, etc), and copy it as a string into provided
2492 |  * 	by program buffer *buf* of size *buf_len*.
2493 |  *
2494 |  * 	The whole value is copied, no matter what file position user
2495 |  * 	space issued e.g. sys_read at.
2496 |  *
2497 |  * 	The buffer is always NUL terminated, unless it's zero-sized.
2498 |  *
2499 |  * Returns
2500 |  * 	Number of character copied (not including the trailing NUL).
2501 |  *
2502 |  * 	**-E2BIG** if the buffer wasn't big enough (*buf* will contain
2503 |  * 	truncated name in this case).
2504 |  *
2505 |  * 	**-EINVAL** if current value was unavailable, e.g. because
2506 |  * 	sysctl is uninitialized and read returns -EIO for it.
2507 |  */
2508 | static long (*bpf_sysctl_get_current_value)(struct bpf_sysctl *ctx, char *buf, unsigned long buf_len) = (void *) 102;
2509 | 
2510 | /*
2511 |  * bpf_sysctl_get_new_value
2512 |  *
2513 |  * 	Get new value being written by user space to sysctl (before
2514 |  * 	the actual write happens) and copy it as a string into
2515 |  * 	provided by program buffer *buf* of size *buf_len*.
2516 |  *
2517 |  * 	User space may write new value at file position > 0.
2518 |  *
2519 |  * 	The buffer is always NUL terminated, unless it's zero-sized.
2520 |  *
2521 |  * Returns
2522 |  * 	Number of character copied (not including the trailing NUL).
2523 |  *
2524 |  * 	**-E2BIG** if the buffer wasn't big enough (*buf* will contain
2525 |  * 	truncated name in this case).
2526 |  *
2527 |  * 	**-EINVAL** if sysctl is being read.
2528 |  */
2529 | static long (*bpf_sysctl_get_new_value)(struct bpf_sysctl *ctx, char *buf, unsigned long buf_len) = (void *) 103;
2530 | 
2531 | /*
2532 |  * bpf_sysctl_set_new_value
2533 |  *
2534 |  * 	Override new value being written by user space to sysctl with
2535 |  * 	value provided by program in buffer *buf* of size *buf_len*.
2536 |  *
2537 |  * 	*buf* should contain a string in same form as provided by user
2538 |  * 	space on sysctl write.
2539 |  *
2540 |  * 	User space may write new value at file position > 0. To override
2541 |  * 	the whole sysctl value file position should be set to zero.
2542 |  *
2543 |  * Returns
2544 |  * 	0 on success.
2545 |  *
2546 |  * 	**-E2BIG** if the *buf_len* is too big.
2547 |  *
2548 |  * 	**-EINVAL** if sysctl is being read.
2549 |  */
2550 | static long (*bpf_sysctl_set_new_value)(struct bpf_sysctl *ctx, const char *buf, unsigned long buf_len) = (void *) 104;
2551 | 
2552 | /*
2553 |  * bpf_strtol
2554 |  *
2555 |  * 	Convert the initial part of the string from buffer *buf* of
2556 |  * 	size *buf_len* to a long integer according to the given base
2557 |  * 	and save the result in *res*.
2558 |  *
2559 |  * 	The string may begin with an arbitrary amount of white space
2560 |  * 	(as determined by **isspace**\ (3)) followed by a single
2561 |  * 	optional '**-**' sign.
2562 |  *
2563 |  * 	Five least significant bits of *flags* encode base, other bits
2564 |  * 	are currently unused.
2565 |  *
2566 |  * 	Base must be either 8, 10, 16 or 0 to detect it automatically
2567 |  * 	similar to user space **strtol**\ (3).
2568 |  *
2569 |  * Returns
2570 |  * 	Number of characters consumed on success. Must be positive but
2571 |  * 	no more than *buf_len*.
2572 |  *
2573 |  * 	**-EINVAL** if no valid digits were found or unsupported base
2574 |  * 	was provided.
2575 |  *
2576 |  * 	**-ERANGE** if resulting value was out of range.
2577 |  */
2578 | static long (*bpf_strtol)(const char *buf, unsigned long buf_len, __u64 flags, long *res) = (void *) 105;
2579 | 
2580 | /*
2581 |  * bpf_strtoul
2582 |  *
2583 |  * 	Convert the initial part of the string from buffer *buf* of
2584 |  * 	size *buf_len* to an unsigned long integer according to the
2585 |  * 	given base and save the result in *res*.
2586 |  *
2587 |  * 	The string may begin with an arbitrary amount of white space
2588 |  * 	(as determined by **isspace**\ (3)).
2589 |  *
2590 |  * 	Five least significant bits of *flags* encode base, other bits
2591 |  * 	are currently unused.
2592 |  *
2593 |  * 	Base must be either 8, 10, 16 or 0 to detect it automatically
2594 |  * 	similar to user space **strtoul**\ (3).
2595 |  *
2596 |  * Returns
2597 |  * 	Number of characters consumed on success. Must be positive but
2598 |  * 	no more than *buf_len*.
2599 |  *
2600 |  * 	**-EINVAL** if no valid digits were found or unsupported base
2601 |  * 	was provided.
2602 |  *
2603 |  * 	**-ERANGE** if resulting value was out of range.
2604 |  */
2605 | static long (*bpf_strtoul)(const char *buf, unsigned long buf_len, __u64 flags, unsigned long *res) = (void *) 106;
2606 | 
2607 | /*
2608 |  * bpf_sk_storage_get
2609 |  *
2610 |  * 	Get a bpf-local-storage from a *sk*.
2611 |  *
2612 |  * 	Logically, it could be thought of getting the value from
2613 |  * 	a *map* with *sk* as the **key**.  From this
2614 |  * 	perspective,  the usage is not much different from
2615 |  * 	**bpf_map_lookup_elem**\ (*map*, **&**\ *sk*) except this
2616 |  * 	helper enforces the key must be a full socket and the map must
2617 |  * 	be a **BPF_MAP_TYPE_SK_STORAGE** also.
2618 |  *
2619 |  * 	Underneath, the value is stored locally at *sk* instead of
2620 |  * 	the *map*.  The *map* is used as the bpf-local-storage
2621 |  * 	"type". The bpf-local-storage "type" (i.e. the *map*) is
2622 |  * 	searched against all bpf-local-storages residing at *sk*.
2623 |  *
2624 |  * 	*sk* is a kernel **struct sock** pointer for LSM program.
2625 |  * 	*sk* is a **struct bpf_sock** pointer for other program types.
2626 |  *
2627 |  * 	An optional *flags* (**BPF_SK_STORAGE_GET_F_CREATE**) can be
2628 |  * 	used such that a new bpf-local-storage will be
2629 |  * 	created if one does not exist.  *value* can be used
2630 |  * 	together with **BPF_SK_STORAGE_GET_F_CREATE** to specify
2631 |  * 	the initial value of a bpf-local-storage.  If *value* is
2632 |  * 	**NULL**, the new bpf-local-storage will be zero initialized.
2633 |  *
2634 |  * Returns
2635 |  * 	A bpf-local-storage pointer is returned on success.
2636 |  *
2637 |  * 	**NULL** if not found or there was an error in adding
2638 |  * 	a new bpf-local-storage.
2639 |  */
2640 | static void *(*bpf_sk_storage_get)(void *map, void *sk, void *value, __u64 flags) = (void *) 107;
2641 | 
2642 | /*
2643 |  * bpf_sk_storage_delete
2644 |  *
2645 |  * 	Delete a bpf-local-storage from a *sk*.
2646 |  *
2647 |  * Returns
2648 |  * 	0 on success.
2649 |  *
2650 |  * 	**-ENOENT** if the bpf-local-storage cannot be found.
2651 |  * 	**-EINVAL** if sk is not a fullsock (e.g. a request_sock).
2652 |  */
2653 | static long (*bpf_sk_storage_delete)(void *map, void *sk) = (void *) 108;
2654 | 
2655 | /*
2656 |  * bpf_send_signal
2657 |  *
2658 |  * 	Send signal *sig* to the process of the current task.
2659 |  * 	The signal may be delivered to any of this process's threads.
2660 |  *
2661 |  * Returns
2662 |  * 	0 on success or successfully queued.
2663 |  *
2664 |  * 	**-EBUSY** if work queue under nmi is full.
2665 |  *
2666 |  * 	**-EINVAL** if *sig* is invalid.
2667 |  *
2668 |  * 	**-EPERM** if no permission to send the *sig*.
2669 |  *
2670 |  * 	**-EAGAIN** if bpf program can try again.
2671 |  */
2672 | static long (*bpf_send_signal)(__u32 sig) = (void *) 109;
2673 | 
2674 | /*
2675 |  * bpf_tcp_gen_syncookie
2676 |  *
2677 |  * 	Try to issue a SYN cookie for the packet with corresponding
2678 |  * 	IP/TCP headers, *iph* and *th*, on the listening socket in *sk*.
2679 |  *
2680 |  * 	*iph* points to the start of the IPv4 or IPv6 header, while
2681 |  * 	*iph_len* contains **sizeof**\ (**struct iphdr**) or
2682 |  * 	**sizeof**\ (**struct ip6hdr**).
2683 |  *
2684 |  * 	*th* points to the start of the TCP header, while *th_len*
2685 |  * 	contains the length of the TCP header.
2686 |  *
2687 |  * Returns
2688 |  * 	On success, lower 32 bits hold the generated SYN cookie in
2689 |  * 	followed by 16 bits which hold the MSS value for that cookie,
2690 |  * 	and the top 16 bits are unused.
2691 |  *
2692 |  * 	On failure, the returned value is one of the following:
2693 |  *
2694 |  * 	**-EINVAL** SYN cookie cannot be issued due to error
2695 |  *
2696 |  * 	**-ENOENT** SYN cookie should not be issued (no SYN flood)
2697 |  *
2698 |  * 	**-EOPNOTSUPP** kernel configuration does not enable SYN cookies
2699 |  *
2700 |  * 	**-EPROTONOSUPPORT** IP packet version is not 4 or 6
2701 |  */
2702 | static __s64 (*bpf_tcp_gen_syncookie)(void *sk, void *iph, __u32 iph_len, struct tcphdr *th, __u32 th_len) = (void *) 110;
2703 | 
2704 | /*
2705 |  * bpf_skb_output
2706 |  *
2707 |  * 	Write raw *data* blob into a special BPF perf event held by
2708 |  * 	*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
2709 |  * 	event must have the following attributes: **PERF_SAMPLE_RAW**
2710 |  * 	as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
2711 |  * 	**PERF_COUNT_SW_BPF_OUTPUT** as **config**.
2712 |  *
2713 |  * 	The *flags* are used to indicate the index in *map* for which
2714 |  * 	the value must be put, masked with **BPF_F_INDEX_MASK**.
2715 |  * 	Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
2716 |  * 	to indicate that the index of the current CPU core should be
2717 |  * 	used.
2718 |  *
2719 |  * 	The value to write, of *size*, is passed through eBPF stack and
2720 |  * 	pointed by *data*.
2721 |  *
2722 |  * 	*ctx* is a pointer to in-kernel struct sk_buff.
2723 |  *
2724 |  * 	This helper is similar to **bpf_perf_event_output**\ () but
2725 |  * 	restricted to raw_tracepoint bpf programs.
2726 |  *
2727 |  * Returns
2728 |  * 	0 on success, or a negative error in case of failure.
2729 |  */
2730 | static long (*bpf_skb_output)(void *ctx, void *map, __u64 flags, void *data, __u64 size) = (void *) 111;
2731 | 
2732 | /*
2733 |  * bpf_probe_read_user
2734 |  *
2735 |  * 	Safely attempt to read *size* bytes from user space address
2736 |  * 	*unsafe_ptr* and store the data in *dst*.
2737 |  *
2738 |  * Returns
2739 |  * 	0 on success, or a negative error in case of failure.
2740 |  */
2741 | static long (*bpf_probe_read_user)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 112;
2742 | 
2743 | /*
2744 |  * bpf_probe_read_kernel
2745 |  *
2746 |  * 	Safely attempt to read *size* bytes from kernel space address
2747 |  * 	*unsafe_ptr* and store the data in *dst*.
2748 |  *
2749 |  * Returns
2750 |  * 	0 on success, or a negative error in case of failure.
2751 |  */
2752 | static long (*bpf_probe_read_kernel)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 113;
2753 | 
2754 | /*
2755 |  * bpf_probe_read_user_str
2756 |  *
2757 |  * 	Copy a NUL terminated string from an unsafe user address
2758 |  * 	*unsafe_ptr* to *dst*. The *size* should include the
2759 |  * 	terminating NUL byte. In case the string length is smaller than
2760 |  * 	*size*, the target is not padded with further NUL bytes. If the
2761 |  * 	string length is larger than *size*, just *size*-1 bytes are
2762 |  * 	copied and the last byte is set to NUL.
2763 |  *
2764 |  * 	On success, returns the number of bytes that were written,
2765 |  * 	including the terminal NUL. This makes this helper useful in
2766 |  * 	tracing programs for reading strings, and more importantly to
2767 |  * 	get its length at runtime. See the following snippet:
2768 |  *
2769 |  * 	::
2770 |  *
2771 |  * 		SEC("kprobe/sys_open")
2772 |  * 		void bpf_sys_open(struct pt_regs *ctx)
2773 |  * 		{
2774 |  * 		        char buf[PATHLEN]; // PATHLEN is defined to 256
2775 |  * 		        int res = bpf_probe_read_user_str(buf, sizeof(buf),
2776 |  * 			                                  ctx->di);
2777 |  *
2778 |  * 			// Consume buf, for example push it to
2779 |  * 			// userspace via bpf_perf_event_output(); we
2780 |  * 			// can use res (the string length) as event
2781 |  * 			// size, after checking its boundaries.
2782 |  * 		}
2783 |  *
2784 |  * 	In comparison, using **bpf_probe_read_user**\ () helper here
2785 |  * 	instead to read the string would require to estimate the length
2786 |  * 	at compile time, and would often result in copying more memory
2787 |  * 	than necessary.
2788 |  *
2789 |  * 	Another useful use case is when parsing individual process
2790 |  * 	arguments or individual environment variables navigating
2791 |  * 	*current*\ **->mm->arg_start** and *current*\
2792 |  * 	**->mm->env_start**: using this helper and the return value,
2793 |  * 	one can quickly iterate at the right offset of the memory area.
2794 |  *
2795 |  * Returns
2796 |  * 	On success, the strictly positive length of the output string,
2797 |  * 	including the trailing NUL character. On error, a negative
2798 |  * 	value.
2799 |  */
2800 | static long (*bpf_probe_read_user_str)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 114;
2801 | 
2802 | /*
2803 |  * bpf_probe_read_kernel_str
2804 |  *
2805 |  * 	Copy a NUL terminated string from an unsafe kernel address *unsafe_ptr*
2806 |  * 	to *dst*. Same semantics as with **bpf_probe_read_user_str**\ () apply.
2807 |  *
2808 |  * Returns
2809 |  * 	On success, the strictly positive length of the string, including
2810 |  * 	the trailing NUL character. On error, a negative value.
2811 |  */
2812 | static long (*bpf_probe_read_kernel_str)(void *dst, __u32 size, const void *unsafe_ptr) = (void *) 115;
2813 | 
2814 | /*
2815 |  * bpf_tcp_send_ack
2816 |  *
2817 |  * 	Send out a tcp-ack. *tp* is the in-kernel struct **tcp_sock**.
2818 |  * 	*rcv_nxt* is the ack_seq to be sent out.
2819 |  *
2820 |  * Returns
2821 |  * 	0 on success, or a negative error in case of failure.
2822 |  */
2823 | static long (*bpf_tcp_send_ack)(void *tp, __u32 rcv_nxt) = (void *) 116;
2824 | 
2825 | /*
2826 |  * bpf_send_signal_thread
2827 |  *
2828 |  * 	Send signal *sig* to the thread corresponding to the current task.
2829 |  *
2830 |  * Returns
2831 |  * 	0 on success or successfully queued.
2832 |  *
2833 |  * 	**-EBUSY** if work queue under nmi is full.
2834 |  *
2835 |  * 	**-EINVAL** if *sig* is invalid.
2836 |  *
2837 |  * 	**-EPERM** if no permission to send the *sig*.
2838 |  *
2839 |  * 	**-EAGAIN** if bpf program can try again.
2840 |  */
2841 | static long (*bpf_send_signal_thread)(__u32 sig) = (void *) 117;
2842 | 
2843 | /*
2844 |  * bpf_jiffies64
2845 |  *
2846 |  * 	Obtain the 64bit jiffies
2847 |  *
2848 |  * Returns
2849 |  * 	The 64 bit jiffies
2850 |  */
2851 | static __u64 (*bpf_jiffies64)(void) = (void *) 118;
2852 | 
2853 | /*
2854 |  * bpf_read_branch_records
2855 |  *
2856 |  * 	For an eBPF program attached to a perf event, retrieve the
2857 |  * 	branch records (**struct perf_branch_entry**) associated to *ctx*
2858 |  * 	and store it in the buffer pointed by *buf* up to size
2859 |  * 	*size* bytes.
2860 |  *
2861 |  * Returns
2862 |  * 	On success, number of bytes written to *buf*. On error, a
2863 |  * 	negative value.
2864 |  *
2865 |  * 	The *flags* can be set to **BPF_F_GET_BRANCH_RECORDS_SIZE** to
2866 |  * 	instead return the number of bytes required to store all the
2867 |  * 	branch entries. If this flag is set, *buf* may be NULL.
2868 |  *
2869 |  * 	**-EINVAL** if arguments invalid or **size** not a multiple
2870 |  * 	of **sizeof**\ (**struct perf_branch_entry**\ ).
2871 |  *
2872 |  * 	**-ENOENT** if architecture does not support branch records.
2873 |  */
2874 | static long (*bpf_read_branch_records)(struct bpf_perf_event_data *ctx, void *buf, __u32 size, __u64 flags) = (void *) 119;
2875 | 
2876 | /*
2877 |  * bpf_get_ns_current_pid_tgid
2878 |  *
2879 |  * 	Returns 0 on success, values for *pid* and *tgid* as seen from the current
2880 |  * 	*namespace* will be returned in *nsdata*.
2881 |  *
2882 |  * Returns
2883 |  * 	0 on success, or one of the following in case of failure:
2884 |  *
2885 |  * 	**-EINVAL** if dev and inum supplied don't match dev_t and inode number
2886 |  * 	with nsfs of current task, or if dev conversion to dev_t lost high bits.
2887 |  *
2888 |  * 	**-ENOENT** if pidns does not exists for the current task.
2889 |  */
2890 | static long (*bpf_get_ns_current_pid_tgid)(__u64 dev, __u64 ino, struct bpf_pidns_info *nsdata, __u32 size) = (void *) 120;
2891 | 
2892 | /*
2893 |  * bpf_xdp_output
2894 |  *
2895 |  * 	Write raw *data* blob into a special BPF perf event held by
2896 |  * 	*map* of type **BPF_MAP_TYPE_PERF_EVENT_ARRAY**. This perf
2897 |  * 	event must have the following attributes: **PERF_SAMPLE_RAW**
2898 |  * 	as **sample_type**, **PERF_TYPE_SOFTWARE** as **type**, and
2899 |  * 	**PERF_COUNT_SW_BPF_OUTPUT** as **config**.
2900 |  *
2901 |  * 	The *flags* are used to indicate the index in *map* for which
2902 |  * 	the value must be put, masked with **BPF_F_INDEX_MASK**.
2903 |  * 	Alternatively, *flags* can be set to **BPF_F_CURRENT_CPU**
2904 |  * 	to indicate that the index of the current CPU core should be
2905 |  * 	used.
2906 |  *
2907 |  * 	The value to write, of *size*, is passed through eBPF stack and
2908 |  * 	pointed by *data*.
2909 |  *
2910 |  * 	*ctx* is a pointer to in-kernel struct xdp_buff.
2911 |  *
2912 |  * 	This helper is similar to **bpf_perf_eventoutput**\ () but
2913 |  * 	restricted to raw_tracepoint bpf programs.
2914 |  *
2915 |  * Returns
2916 |  * 	0 on success, or a negative error in case of failure.
2917 |  */
2918 | static long (*bpf_xdp_output)(void *ctx, void *map, __u64 flags, void *data, __u64 size) = (void *) 121;
2919 | 
2920 | /*
2921 |  * bpf_get_netns_cookie
2922 |  *
2923 |  * 	Retrieve the cookie (generated by the kernel) of the network
2924 |  * 	namespace the input *ctx* is associated with. The network
2925 |  * 	namespace cookie remains stable for its lifetime and provides
2926 |  * 	a global identifier that can be assumed unique. If *ctx* is
2927 |  * 	NULL, then the helper returns the cookie for the initial
2928 |  * 	network namespace. The cookie itself is very similar to that
2929 |  * 	of **bpf_get_socket_cookie**\ () helper, but for network
2930 |  * 	namespaces instead of sockets.
2931 |  *
2932 |  * Returns
2933 |  * 	A 8-byte long opaque number.
2934 |  */
2935 | static __u64 (*bpf_get_netns_cookie)(void *ctx) = (void *) 122;
2936 | 
2937 | /*
2938 |  * bpf_get_current_ancestor_cgroup_id
2939 |  *
2940 |  * 	Return id of cgroup v2 that is ancestor of the cgroup associated
2941 |  * 	with the current task at the *ancestor_level*. The root cgroup
2942 |  * 	is at *ancestor_level* zero and each step down the hierarchy
2943 |  * 	increments the level. If *ancestor_level* == level of cgroup
2944 |  * 	associated with the current task, then return value will be the
2945 |  * 	same as that of **bpf_get_current_cgroup_id**\ ().
2946 |  *
2947 |  * 	The helper is useful to implement policies based on cgroups
2948 |  * 	that are upper in hierarchy than immediate cgroup associated
2949 |  * 	with the current task.
2950 |  *
2951 |  * 	The format of returned id and helper limitations are same as in
2952 |  * 	**bpf_get_current_cgroup_id**\ ().
2953 |  *
2954 |  * Returns
2955 |  * 	The id is returned or 0 in case the id could not be retrieved.
2956 |  */
2957 | static __u64 (*bpf_get_current_ancestor_cgroup_id)(int ancestor_level) = (void *) 123;
2958 | 
2959 | /*
2960 |  * bpf_sk_assign
2961 |  *
2962 |  * 	Helper is overloaded depending on BPF program type. This
2963 |  * 	description applies to **BPF_PROG_TYPE_SCHED_CLS** and
2964 |  * 	**BPF_PROG_TYPE_SCHED_ACT** programs.
2965 |  *
2966 |  * 	Assign the *sk* to the *skb*. When combined with appropriate
2967 |  * 	routing configuration to receive the packet towards the socket,
2968 |  * 	will cause *skb* to be delivered to the specified socket.
2969 |  * 	Subsequent redirection of *skb* via  **bpf_redirect**\ (),
2970 |  * 	**bpf_clone_redirect**\ () or other methods outside of BPF may
2971 |  * 	interfere with successful delivery to the socket.
2972 |  *
2973 |  * 	This operation is only valid from TC ingress path.
2974 |  *
2975 |  * 	The *flags* argument must be zero.
2976 |  *
2977 |  * Returns
2978 |  * 	0 on success, or a negative error in case of failure:
2979 |  *
2980 |  * 	**-EINVAL** if specified *flags* are not supported.
2981 |  *
2982 |  * 	**-ENOENT** if the socket is unavailable for assignment.
2983 |  *
2984 |  * 	**-ENETUNREACH** if the socket is unreachable (wrong netns).
2985 |  *
2986 |  * 	**-EOPNOTSUPP** if the operation is not supported, for example
2987 |  * 	a call from outside of TC ingress.
2988 |  *
2989 |  * 	**-ESOCKTNOSUPPORT** if the socket type is not supported
2990 |  * 	(reuseport).
2991 |  */
2992 | static long (*bpf_sk_assign)(void *ctx, void *sk, __u64 flags) = (void *) 124;
2993 | 
2994 | /*
2995 |  * bpf_ktime_get_boot_ns
2996 |  *
2997 |  * 	Return the time elapsed since system boot, in nanoseconds.
2998 |  * 	Does include the time the system was suspended.
2999 |  * 	See: **clock_gettime**\ (**CLOCK_BOOTTIME**)
3000 |  *
3001 |  * Returns
3002 |  * 	Current *ktime*.
3003 |  */
3004 | static __u64 (*bpf_ktime_get_boot_ns)(void) = (void *) 125;
3005 | 
3006 | /*
3007 |  * bpf_seq_printf
3008 |  *
3009 |  * 	**bpf_seq_printf**\ () uses seq_file **seq_printf**\ () to print
3010 |  * 	out the format string.
3011 |  * 	The *m* represents the seq_file. The *fmt* and *fmt_size* are for
3012 |  * 	the format string itself. The *data* and *data_len* are format string
3013 |  * 	arguments. The *data* are a **u64** array and corresponding format string
3014 |  * 	values are stored in the array. For strings and pointers where pointees
3015 |  * 	are accessed, only the pointer values are stored in the *data* array.
3016 |  * 	The *data_len* is the size of *data* in bytes - must be a multiple of 8.
3017 |  *
3018 |  * 	Formats **%s**, **%p{i,I}{4,6}** requires to read kernel memory.
3019 |  * 	Reading kernel memory may fail due to either invalid address or
3020 |  * 	valid address but requiring a major memory fault. If reading kernel memory
3021 |  * 	fails, the string for **%s** will be an empty string, and the ip
3022 |  * 	address for **%p{i,I}{4,6}** will be 0. Not returning error to
3023 |  * 	bpf program is consistent with what **bpf_trace_printk**\ () does for now.
3024 |  *
3025 |  * Returns
3026 |  * 	0 on success, or a negative error in case of failure:
3027 |  *
3028 |  * 	**-EBUSY** if per-CPU memory copy buffer is busy, can try again
3029 |  * 	by returning 1 from bpf program.
3030 |  *
3031 |  * 	**-EINVAL** if arguments are invalid, or if *fmt* is invalid/unsupported.
3032 |  *
3033 |  * 	**-E2BIG** if *fmt* contains too many format specifiers.
3034 |  *
3035 |  * 	**-EOVERFLOW** if an overflow happened: The same object will be tried again.
3036 |  */
3037 | static long (*bpf_seq_printf)(struct seq_file *m, const char *fmt, __u32 fmt_size, const void *data, __u32 data_len) = (void *) 126;
3038 | 
3039 | /*
3040 |  * bpf_seq_write
3041 |  *
3042 |  * 	**bpf_seq_write**\ () uses seq_file **seq_write**\ () to write the data.
3043 |  * 	The *m* represents the seq_file. The *data* and *len* represent the
3044 |  * 	data to write in bytes.
3045 |  *
3046 |  * Returns
3047 |  * 	0 on success, or a negative error in case of failure:
3048 |  *
3049 |  * 	**-EOVERFLOW** if an overflow happened: The same object will be tried again.
3050 |  */
3051 | static long (*bpf_seq_write)(struct seq_file *m, const void *data, __u32 len) = (void *) 127;
3052 | 
3053 | /*
3054 |  * bpf_sk_cgroup_id
3055 |  *
3056 |  * 	Return the cgroup v2 id of the socket *sk*.
3057 |  *
3058 |  * 	*sk* must be a non-**NULL** pointer to a socket, e.g. one
3059 |  * 	returned from **bpf_sk_lookup_xxx**\ (),
3060 |  * 	**bpf_sk_fullsock**\ (), etc. The format of returned id is
3061 |  * 	same as in **bpf_skb_cgroup_id**\ ().
3062 |  *
3063 |  * 	This helper is available only if the kernel was compiled with
3064 |  * 	the **CONFIG_SOCK_CGROUP_DATA** configuration option.
3065 |  *
3066 |  * Returns
3067 |  * 	The id is returned or 0 in case the id could not be retrieved.
3068 |  */
3069 | static __u64 (*bpf_sk_cgroup_id)(void *sk) = (void *) 128;
3070 | 
3071 | /*
3072 |  * bpf_sk_ancestor_cgroup_id
3073 |  *
3074 |  * 	Return id of cgroup v2 that is ancestor of cgroup associated
3075 |  * 	with the *sk* at the *ancestor_level*.  The root cgroup is at
3076 |  * 	*ancestor_level* zero and each step down the hierarchy
3077 |  * 	increments the level. If *ancestor_level* == level of cgroup
3078 |  * 	associated with *sk*, then return value will be same as that
3079 |  * 	of **bpf_sk_cgroup_id**\ ().
3080 |  *
3081 |  * 	The helper is useful to implement policies based on cgroups
3082 |  * 	that are upper in hierarchy than immediate cgroup associated
3083 |  * 	with *sk*.
3084 |  *
3085 |  * 	The format of returned id and helper limitations are same as in
3086 |  * 	**bpf_sk_cgroup_id**\ ().
3087 |  *
3088 |  * Returns
3089 |  * 	The id is returned or 0 in case the id could not be retrieved.
3090 |  */
3091 | static __u64 (*bpf_sk_ancestor_cgroup_id)(void *sk, int ancestor_level) = (void *) 129;
3092 | 
3093 | /*
3094 |  * bpf_ringbuf_output
3095 |  *
3096 |  * 	Copy *size* bytes from *data* into a ring buffer *ringbuf*.
3097 |  * 	If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
3098 |  * 	of new data availability is sent.
3099 |  * 	If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
3100 |  * 	of new data availability is sent unconditionally.
3101 |  * 	If **0** is specified in *flags*, an adaptive notification
3102 |  * 	of new data availability is sent.
3103 |  *
3104 |  * 	An adaptive notification is a notification sent whenever the user-space
3105 |  * 	process has caught up and consumed all available payloads. In case the user-space
3106 |  * 	process is still processing a previous payload, then no notification is needed
3107 |  * 	as it will process the newly added payload automatically.
3108 |  *
3109 |  * Returns
3110 |  * 	0 on success, or a negative error in case of failure.
3111 |  */
3112 | static long (*bpf_ringbuf_output)(void *ringbuf, void *data, __u64 size, __u64 flags) = (void *) 130;
3113 | 
3114 | /*
3115 |  * bpf_ringbuf_reserve
3116 |  *
3117 |  * 	Reserve *size* bytes of payload in a ring buffer *ringbuf*.
3118 |  * 	*flags* must be 0.
3119 |  *
3120 |  * Returns
3121 |  * 	Valid pointer with *size* bytes of memory available; NULL,
3122 |  * 	otherwise.
3123 |  */
3124 | static void *(*bpf_ringbuf_reserve)(void *ringbuf, __u64 size, __u64 flags) = (void *) 131;
3125 | 
3126 | /*
3127 |  * bpf_ringbuf_submit
3128 |  *
3129 |  * 	Submit reserved ring buffer sample, pointed to by *data*.
3130 |  * 	If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
3131 |  * 	of new data availability is sent.
3132 |  * 	If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
3133 |  * 	of new data availability is sent unconditionally.
3134 |  * 	If **0** is specified in *flags*, an adaptive notification
3135 |  * 	of new data availability is sent.
3136 |  *
3137 |  * 	See 'bpf_ringbuf_output()' for the definition of adaptive notification.
3138 |  *
3139 |  * Returns
3140 |  * 	Nothing. Always succeeds.
3141 |  */
3142 | static void (*bpf_ringbuf_submit)(void *data, __u64 flags) = (void *) 132;
3143 | 
3144 | /*
3145 |  * bpf_ringbuf_discard
3146 |  *
3147 |  * 	Discard reserved ring buffer sample, pointed to by *data*.
3148 |  * 	If **BPF_RB_NO_WAKEUP** is specified in *flags*, no notification
3149 |  * 	of new data availability is sent.
3150 |  * 	If **BPF_RB_FORCE_WAKEUP** is specified in *flags*, notification
3151 |  * 	of new data availability is sent unconditionally.
3152 |  * 	If **0** is specified in *flags*, an adaptive notification
3153 |  * 	of new data availability is sent.
3154 |  *
3155 |  * 	See 'bpf_ringbuf_output()' for the definition of adaptive notification.
3156 |  *
3157 |  * Returns
3158 |  * 	Nothing. Always succeeds.
3159 |  */
3160 | static void (*bpf_ringbuf_discard)(void *data, __u64 flags) = (void *) 133;
3161 | 
3162 | /*
3163 |  * bpf_ringbuf_query
3164 |  *
3165 |  * 	Query various characteristics of provided ring buffer. What
3166 |  * 	exactly is queries is determined by *flags*:
3167 |  *
3168 |  * 	* **BPF_RB_AVAIL_DATA**: Amount of data not yet consumed.
3169 |  * 	* **BPF_RB_RING_SIZE**: The size of ring buffer.
3170 |  * 	* **BPF_RB_CONS_POS**: Consumer position (can wrap around).
3171 |  * 	* **BPF_RB_PROD_POS**: Producer(s) position (can wrap around).
3172 |  *
3173 |  * 	Data returned is just a momentary snapshot of actual values
3174 |  * 	and could be inaccurate, so this facility should be used to
3175 |  * 	power heuristics and for reporting, not to make 100% correct
3176 |  * 	calculation.
3177 |  *
3178 |  * Returns
3179 |  * 	Requested value, or 0, if *flags* are not recognized.
3180 |  */
3181 | static __u64 (*bpf_ringbuf_query)(void *ringbuf, __u64 flags) = (void *) 134;
3182 | 
3183 | /*
3184 |  * bpf_csum_level
3185 |  *
3186 |  * 	Change the skbs checksum level by one layer up or down, or
3187 |  * 	reset it entirely to none in order to have the stack perform
3188 |  * 	checksum validation. The level is applicable to the following
3189 |  * 	protocols: TCP, UDP, GRE, SCTP, FCOE. For example, a decap of
3190 |  * 	| ETH | IP | UDP | GUE | IP | TCP | into | ETH | IP | TCP |
3191 |  * 	through **bpf_skb_adjust_room**\ () helper with passing in
3192 |  * 	**BPF_F_ADJ_ROOM_NO_CSUM_RESET** flag would require one	call
3193 |  * 	to **bpf_csum_level**\ () with **BPF_CSUM_LEVEL_DEC** since
3194 |  * 	the UDP header is removed. Similarly, an encap of the latter
3195 |  * 	into the former could be accompanied by a helper call to
3196 |  * 	**bpf_csum_level**\ () with **BPF_CSUM_LEVEL_INC** if the
3197 |  * 	skb is still intended to be processed in higher layers of the
3198 |  * 	stack instead of just egressing at tc.
3199 |  *
3200 |  * 	There are three supported level settings at this time:
3201 |  *
3202 |  * 	* **BPF_CSUM_LEVEL_INC**: Increases skb->csum_level for skbs
3203 |  * 	  with CHECKSUM_UNNECESSARY.
3204 |  * 	* **BPF_CSUM_LEVEL_DEC**: Decreases skb->csum_level for skbs
3205 |  * 	  with CHECKSUM_UNNECESSARY.
3206 |  * 	* **BPF_CSUM_LEVEL_RESET**: Resets skb->csum_level to 0 and
3207 |  * 	  sets CHECKSUM_NONE to force checksum validation by the stack.
3208 |  * 	* **BPF_CSUM_LEVEL_QUERY**: No-op, returns the current
3209 |  * 	  skb->csum_level.
3210 |  *
3211 |  * Returns
3212 |  * 	0 on success, or a negative error in case of failure. In the
3213 |  * 	case of **BPF_CSUM_LEVEL_QUERY**, the current skb->csum_level
3214 |  * 	is returned or the error code -EACCES in case the skb is not
3215 |  * 	subject to CHECKSUM_UNNECESSARY.
3216 |  */
3217 | static long (*bpf_csum_level)(struct __sk_buff *skb, __u64 level) = (void *) 135;
3218 | 
3219 | /*
3220 |  * bpf_skc_to_tcp6_sock
3221 |  *
3222 |  * 	Dynamically cast a *sk* pointer to a *tcp6_sock* pointer.
3223 |  *
3224 |  * Returns
3225 |  * 	*sk* if casting is valid, or **NULL** otherwise.
3226 |  */
3227 | static struct tcp6_sock *(*bpf_skc_to_tcp6_sock)(void *sk) = (void *) 136;
3228 | 
3229 | /*
3230 |  * bpf_skc_to_tcp_sock
3231 |  *
3232 |  * 	Dynamically cast a *sk* pointer to a *tcp_sock* pointer.
3233 |  *
3234 |  * Returns
3235 |  * 	*sk* if casting is valid, or **NULL** otherwise.
3236 |  */
3237 | static struct tcp_sock *(*bpf_skc_to_tcp_sock)(void *sk) = (void *) 137;
3238 | 
3239 | /*
3240 |  * bpf_skc_to_tcp_timewait_sock
3241 |  *
3242 |  * 	Dynamically cast a *sk* pointer to a *tcp_timewait_sock* pointer.
3243 |  *
3244 |  * Returns
3245 |  * 	*sk* if casting is valid, or **NULL** otherwise.
3246 |  */
3247 | static struct tcp_timewait_sock *(*bpf_skc_to_tcp_timewait_sock)(void *sk) = (void *) 138;
3248 | 
3249 | /*
3250 |  * bpf_skc_to_tcp_request_sock
3251 |  *
3252 |  * 	Dynamically cast a *sk* pointer to a *tcp_request_sock* pointer.
3253 |  *
3254 |  * Returns
3255 |  * 	*sk* if casting is valid, or **NULL** otherwise.
3256 |  */
3257 | static struct tcp_request_sock *(*bpf_skc_to_tcp_request_sock)(void *sk) = (void *) 139;
3258 | 
3259 | /*
3260 |  * bpf_skc_to_udp6_sock
3261 |  *
3262 |  * 	Dynamically cast a *sk* pointer to a *udp6_sock* pointer.
3263 |  *
3264 |  * Returns
3265 |  * 	*sk* if casting is valid, or **NULL** otherwise.
3266 |  */
3267 | static struct udp6_sock *(*bpf_skc_to_udp6_sock)(void *sk) = (void *) 140;
3268 | 
3269 | /*
3270 |  * bpf_get_task_stack
3271 |  *
3272 |  * 	Return a user or a kernel stack in bpf program provided buffer.
3273 |  * 	To achieve this, the helper needs *task*, which is a valid
3274 |  * 	pointer to **struct task_struct**. To store the stacktrace, the
3275 |  * 	bpf program provides *buf* with a nonnegative *size*.
3276 |  *
3277 |  * 	The last argument, *flags*, holds the number of stack frames to
3278 |  * 	skip (from 0 to 255), masked with
3279 |  * 	**BPF_F_SKIP_FIELD_MASK**. The next bits can be used to set
3280 |  * 	the following flags:
3281 |  *
3282 |  * 	**BPF_F_USER_STACK**
3283 |  * 		Collect a user space stack instead of a kernel stack.
3284 |  * 	**BPF_F_USER_BUILD_ID**
3285 |  * 		Collect buildid+offset instead of ips for user stack,
3286 |  * 		only valid if **BPF_F_USER_STACK** is also specified.
3287 |  *
3288 |  * 	**bpf_get_task_stack**\ () can collect up to
3289 |  * 	**PERF_MAX_STACK_DEPTH** both kernel and user frames, subject
3290 |  * 	to sufficient large buffer size. Note that
3291 |  * 	this limit can be controlled with the **sysctl** program, and
3292 |  * 	that it should be manually increased in order to profile long
3293 |  * 	user stacks (such as stacks for Java programs). To do so, use:
3294 |  *
3295 |  * 	::
3296 |  *
3297 |  * 		# sysctl kernel.perf_event_max_stack=<new value>
3298 |  *
3299 |  * Returns
3300 |  * 	A non-negative value equal to or less than *size* on success,
3301 |  * 	or a negative error in case of failure.
3302 |  */
3303 | static long (*bpf_get_task_stack)(struct task_struct *task, void *buf, __u32 size, __u64 flags) = (void *) 141;
3304 | 
3305 | /*
3306 |  * bpf_load_hdr_opt
3307 |  *
3308 |  * 	Load header option.  Support reading a particular TCP header
3309 |  * 	option for bpf program (**BPF_PROG_TYPE_SOCK_OPS**).
3310 |  *
3311 |  * 	If *flags* is 0, it will search the option from the
3312 |  * 	*skops*\ **->skb_data**.  The comment in **struct bpf_sock_ops**
3313 |  * 	has details on what skb_data contains under different
3314 |  * 	*skops*\ **->op**.
3315 |  *
3316 |  * 	The first byte of the *searchby_res* specifies the
3317 |  * 	kind that it wants to search.
3318 |  *
3319 |  * 	If the searching kind is an experimental kind
3320 |  * 	(i.e. 253 or 254 according to RFC6994).  It also
3321 |  * 	needs to specify the "magic" which is either
3322 |  * 	2 bytes or 4 bytes.  It then also needs to
3323 |  * 	specify the size of the magic by using
3324 |  * 	the 2nd byte which is "kind-length" of a TCP
3325 |  * 	header option and the "kind-length" also
3326 |  * 	includes the first 2 bytes "kind" and "kind-length"
3327 |  * 	itself as a normal TCP header option also does.
3328 |  *
3329 |  * 	For example, to search experimental kind 254 with
3330 |  * 	2 byte magic 0xeB9F, the searchby_res should be
3331 |  * 	[ 254, 4, 0xeB, 0x9F, 0, 0, .... 0 ].
3332 |  *
3333 |  * 	To search for the standard window scale option (3),
3334 |  * 	the *searchby_res* should be [ 3, 0, 0, .... 0 ].
3335 |  * 	Note, kind-length must be 0 for regular option.
3336 |  *
3337 |  * 	Searching for No-Op (0) and End-of-Option-List (1) are
3338 |  * 	not supported.
3339 |  *
3340 |  * 	*len* must be at least 2 bytes which is the minimal size
3341 |  * 	of a header option.
3342 |  *
3343 |  * 	Supported flags:
3344 |  *
3345 |  * 	* **BPF_LOAD_HDR_OPT_TCP_SYN** to search from the
3346 |  * 	  saved_syn packet or the just-received syn packet.
3347 |  *
3348 |  *
3349 |  * Returns
3350 |  * 	> 0 when found, the header option is copied to *searchby_res*.
3351 |  * 	The return value is the total length copied. On failure, a
3352 |  * 	negative error code is returned:
3353 |  *
3354 |  * 	**-EINVAL** if a parameter is invalid.
3355 |  *
3356 |  * 	**-ENOMSG** if the option is not found.
3357 |  *
3358 |  * 	**-ENOENT** if no syn packet is available when
3359 |  * 	**BPF_LOAD_HDR_OPT_TCP_SYN** is used.
3360 |  *
3361 |  * 	**-ENOSPC** if there is not enough space.  Only *len* number of
3362 |  * 	bytes are copied.
3363 |  *
3364 |  * 	**-EFAULT** on failure to parse the header options in the
3365 |  * 	packet.
3366 |  *
3367 |  * 	**-EPERM** if the helper cannot be used under the current
3368 |  * 	*skops*\ **->op**.
3369 |  */
3370 | static long (*bpf_load_hdr_opt)(struct bpf_sock_ops *skops, void *searchby_res, __u32 len, __u64 flags) = (void *) 142;
3371 | 
3372 | /*
3373 |  * bpf_store_hdr_opt
3374 |  *
3375 |  * 	Store header option.  The data will be copied
3376 |  * 	from buffer *from* with length *len* to the TCP header.
3377 |  *
3378 |  * 	The buffer *from* should have the whole option that
3379 |  * 	includes the kind, kind-length, and the actual
3380 |  * 	option data.  The *len* must be at least kind-length
3381 |  * 	long.  The kind-length does not have to be 4 byte
3382 |  * 	aligned.  The kernel will take care of the padding
3383 |  * 	and setting the 4 bytes aligned value to th->doff.
3384 |  *
3385 |  * 	This helper will check for duplicated option
3386 |  * 	by searching the same option in the outgoing skb.
3387 |  *
3388 |  * 	This helper can only be called during
3389 |  * 	**BPF_SOCK_OPS_WRITE_HDR_OPT_CB**.
3390 |  *
3391 |  *
3392 |  * Returns
3393 |  * 	0 on success, or negative error in case of failure:
3394 |  *
3395 |  * 	**-EINVAL** If param is invalid.
3396 |  *
3397 |  * 	**-ENOSPC** if there is not enough space in the header.
3398 |  * 	Nothing has been written
3399 |  *
3400 |  * 	**-EEXIST** if the option already exists.
3401 |  *
3402 |  * 	**-EFAULT** on failrue to parse the existing header options.
3403 |  *
3404 |  * 	**-EPERM** if the helper cannot be used under the current
3405 |  * 	*skops*\ **->op**.
3406 |  */
3407 | static long (*bpf_store_hdr_opt)(struct bpf_sock_ops *skops, const void *from, __u32 len, __u64 flags) = (void *) 143;
3408 | 
3409 | /*
3410 |  * bpf_reserve_hdr_opt
3411 |  *
3412 |  * 	Reserve *len* bytes for the bpf header option.  The
3413 |  * 	space will be used by **bpf_store_hdr_opt**\ () later in
3414 |  * 	**BPF_SOCK_OPS_WRITE_HDR_OPT_CB**.
3415 |  *
3416 |  * 	If **bpf_reserve_hdr_opt**\ () is called multiple times,
3417 |  * 	the total number of bytes will be reserved.
3418 |  *
3419 |  * 	This helper can only be called during
3420 |  * 	**BPF_SOCK_OPS_HDR_OPT_LEN_CB**.
3421 |  *
3422 |  *
3423 |  * Returns
3424 |  * 	0 on success, or negative error in case of failure:
3425 |  *
3426 |  * 	**-EINVAL** if a parameter is invalid.
3427 |  *
3428 |  * 	**-ENOSPC** if there is not enough space in the header.
3429 |  *
3430 |  * 	**-EPERM** if the helper cannot be used under the current
3431 |  * 	*skops*\ **->op**.
3432 |  */
3433 | static long (*bpf_reserve_hdr_opt)(struct bpf_sock_ops *skops, __u32 len, __u64 flags) = (void *) 144;
3434 | 
3435 | /*
3436 |  * bpf_inode_storage_get
3437 |  *
3438 |  * 	Get a bpf_local_storage from an *inode*.
3439 |  *
3440 |  * 	Logically, it could be thought of as getting the value from
3441 |  * 	a *map* with *inode* as the **key**.  From this
3442 |  * 	perspective,  the usage is not much different from
3443 |  * 	**bpf_map_lookup_elem**\ (*map*, **&**\ *inode*) except this
3444 |  * 	helper enforces the key must be an inode and the map must also
3445 |  * 	be a **BPF_MAP_TYPE_INODE_STORAGE**.
3446 |  *
3447 |  * 	Underneath, the value is stored locally at *inode* instead of
3448 |  * 	the *map*.  The *map* is used as the bpf-local-storage
3449 |  * 	"type". The bpf-local-storage "type" (i.e. the *map*) is
3450 |  * 	searched against all bpf_local_storage residing at *inode*.
3451 |  *
3452 |  * 	An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
3453 |  * 	used such that a new bpf_local_storage will be
3454 |  * 	created if one does not exist.  *value* can be used
3455 |  * 	together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
3456 |  * 	the initial value of a bpf_local_storage.  If *value* is
3457 |  * 	**NULL**, the new bpf_local_storage will be zero initialized.
3458 |  *
3459 |  * Returns
3460 |  * 	A bpf_local_storage pointer is returned on success.
3461 |  *
3462 |  * 	**NULL** if not found or there was an error in adding
3463 |  * 	a new bpf_local_storage.
3464 |  */
3465 | static void *(*bpf_inode_storage_get)(void *map, void *inode, void *value, __u64 flags) = (void *) 145;
3466 | 
3467 | /*
3468 |  * bpf_inode_storage_delete
3469 |  *
3470 |  * 	Delete a bpf_local_storage from an *inode*.
3471 |  *
3472 |  * Returns
3473 |  * 	0 on success.
3474 |  *
3475 |  * 	**-ENOENT** if the bpf_local_storage cannot be found.
3476 |  */
3477 | static int (*bpf_inode_storage_delete)(void *map, void *inode) = (void *) 146;
3478 | 
3479 | /*
3480 |  * bpf_d_path
3481 |  *
3482 |  * 	Return full path for given **struct path** object, which
3483 |  * 	needs to be the kernel BTF *path* object. The path is
3484 |  * 	returned in the provided buffer *buf* of size *sz* and
3485 |  * 	is zero terminated.
3486 |  *
3487 |  *
3488 |  * Returns
3489 |  * 	On success, the strictly positive length of the string,
3490 |  * 	including the trailing NUL character. On error, a negative
3491 |  * 	value.
3492 |  */
3493 | static long (*bpf_d_path)(struct path *path, char *buf, __u32 sz) = (void *) 147;
3494 | 
3495 | /*
3496 |  * bpf_copy_from_user
3497 |  *
3498 |  * 	Read *size* bytes from user space address *user_ptr* and store
3499 |  * 	the data in *dst*. This is a wrapper of **copy_from_user**\ ().
3500 |  *
3501 |  * Returns
3502 |  * 	0 on success, or a negative error in case of failure.
3503 |  */
3504 | static long (*bpf_copy_from_user)(void *dst, __u32 size, const void *user_ptr) = (void *) 148;
3505 | 
3506 | /*
3507 |  * bpf_snprintf_btf
3508 |  *
3509 |  * 	Use BTF to store a string representation of *ptr*->ptr in *str*,
3510 |  * 	using *ptr*->type_id.  This value should specify the type
3511 |  * 	that *ptr*->ptr points to. LLVM __builtin_btf_type_id(type, 1)
3512 |  * 	can be used to look up vmlinux BTF type ids. Traversing the
3513 |  * 	data structure using BTF, the type information and values are
3514 |  * 	stored in the first *str_size* - 1 bytes of *str*.  Safe copy of
3515 |  * 	the pointer data is carried out to avoid kernel crashes during
3516 |  * 	operation.  Smaller types can use string space on the stack;
3517 |  * 	larger programs can use map data to store the string
3518 |  * 	representation.
3519 |  *
3520 |  * 	The string can be subsequently shared with userspace via
3521 |  * 	bpf_perf_event_output() or ring buffer interfaces.
3522 |  * 	bpf_trace_printk() is to be avoided as it places too small
3523 |  * 	a limit on string size to be useful.
3524 |  *
3525 |  * 	*flags* is a combination of
3526 |  *
3527 |  * 	**BTF_F_COMPACT**
3528 |  * 		no formatting around type information
3529 |  * 	**BTF_F_NONAME**
3530 |  * 		no struct/union member names/types
3531 |  * 	**BTF_F_PTR_RAW**
3532 |  * 		show raw (unobfuscated) pointer values;
3533 |  * 		equivalent to printk specifier %px.
3534 |  * 	**BTF_F_ZERO**
3535 |  * 		show zero-valued struct/union members; they
3536 |  * 		are not displayed by default
3537 |  *
3538 |  *
3539 |  * Returns
3540 |  * 	The number of bytes that were written (or would have been
3541 |  * 	written if output had to be truncated due to string size),
3542 |  * 	or a negative error in cases of failure.
3543 |  */
3544 | static long (*bpf_snprintf_btf)(char *str, __u32 str_size, struct btf_ptr *ptr, __u32 btf_ptr_size, __u64 flags) = (void *) 149;
3545 | 
3546 | /*
3547 |  * bpf_seq_printf_btf
3548 |  *
3549 |  * 	Use BTF to write to seq_write a string representation of
3550 |  * 	*ptr*->ptr, using *ptr*->type_id as per bpf_snprintf_btf().
3551 |  * 	*flags* are identical to those used for bpf_snprintf_btf.
3552 |  *
3553 |  * Returns
3554 |  * 	0 on success or a negative error in case of failure.
3555 |  */
3556 | static long (*bpf_seq_printf_btf)(struct seq_file *m, struct btf_ptr *ptr, __u32 ptr_size, __u64 flags) = (void *) 150;
3557 | 
3558 | /*
3559 |  * bpf_skb_cgroup_classid
3560 |  *
3561 |  * 	See **bpf_get_cgroup_classid**\ () for the main description.
3562 |  * 	This helper differs from **bpf_get_cgroup_classid**\ () in that
3563 |  * 	the cgroup v1 net_cls class is retrieved only from the *skb*'s
3564 |  * 	associated socket instead of the current process.
3565 |  *
3566 |  * Returns
3567 |  * 	The id is returned or 0 in case the id could not be retrieved.
3568 |  */
3569 | static __u64 (*bpf_skb_cgroup_classid)(struct __sk_buff *skb) = (void *) 151;
3570 | 
3571 | /*
3572 |  * bpf_redirect_neigh
3573 |  *
3574 |  * 	Redirect the packet to another net device of index *ifindex*
3575 |  * 	and fill in L2 addresses from neighboring subsystem. This helper
3576 |  * 	is somewhat similar to **bpf_redirect**\ (), except that it
3577 |  * 	populates L2 addresses as well, meaning, internally, the helper
3578 |  * 	relies on the neighbor lookup for the L2 address of the nexthop.
3579 |  *
3580 |  * 	The helper will perform a FIB lookup based on the skb's
3581 |  * 	networking header to get the address of the next hop, unless
3582 |  * 	this is supplied by the caller in the *params* argument. The
3583 |  * 	*plen* argument indicates the len of *params* and should be set
3584 |  * 	to 0 if *params* is NULL.
3585 |  *
3586 |  * 	The *flags* argument is reserved and must be 0. The helper is
3587 |  * 	currently only supported for tc BPF program types, and enabled
3588 |  * 	for IPv4 and IPv6 protocols.
3589 |  *
3590 |  * Returns
3591 |  * 	The helper returns **TC_ACT_REDIRECT** on success or
3592 |  * 	**TC_ACT_SHOT** on error.
3593 |  */
3594 | static long (*bpf_redirect_neigh)(__u32 ifindex, struct bpf_redir_neigh *params, int plen, __u64 flags) = (void *) 152;
3595 | 
3596 | /*
3597 |  * bpf_per_cpu_ptr
3598 |  *
3599 |  * 	Take a pointer to a percpu ksym, *percpu_ptr*, and return a
3600 |  * 	pointer to the percpu kernel variable on *cpu*. A ksym is an
3601 |  * 	extern variable decorated with '__ksym'. For ksym, there is a
3602 |  * 	global var (either static or global) defined of the same name
3603 |  * 	in the kernel. The ksym is percpu if the global var is percpu.
3604 |  * 	The returned pointer points to the global percpu var on *cpu*.
3605 |  *
3606 |  * 	bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the
3607 |  * 	kernel, except that bpf_per_cpu_ptr() may return NULL. This
3608 |  * 	happens if *cpu* is larger than nr_cpu_ids. The caller of
3609 |  * 	bpf_per_cpu_ptr() must check the returned value.
3610 |  *
3611 |  * Returns
3612 |  * 	A pointer pointing to the kernel percpu variable on *cpu*, or
3613 |  * 	NULL, if *cpu* is invalid.
3614 |  */
3615 | static void *(*bpf_per_cpu_ptr)(const void *percpu_ptr, __u32 cpu) = (void *) 153;
3616 | 
3617 | /*
3618 |  * bpf_this_cpu_ptr
3619 |  *
3620 |  * 	Take a pointer to a percpu ksym, *percpu_ptr*, and return a
3621 |  * 	pointer to the percpu kernel variable on this cpu. See the
3622 |  * 	description of 'ksym' in **bpf_per_cpu_ptr**\ ().
3623 |  *
3624 |  * 	bpf_this_cpu_ptr() has the same semantic as this_cpu_ptr() in
3625 |  * 	the kernel. Different from **bpf_per_cpu_ptr**\ (), it would
3626 |  * 	never return NULL.
3627 |  *
3628 |  * Returns
3629 |  * 	A pointer pointing to the kernel percpu variable on this cpu.
3630 |  */
3631 | static void *(*bpf_this_cpu_ptr)(const void *percpu_ptr) = (void *) 154;
3632 | 
3633 | /*
3634 |  * bpf_redirect_peer
3635 |  *
3636 |  * 	Redirect the packet to another net device of index *ifindex*.
3637 |  * 	This helper is somewhat similar to **bpf_redirect**\ (), except
3638 |  * 	that the redirection happens to the *ifindex*' peer device and
3639 |  * 	the netns switch takes place from ingress to ingress without
3640 |  * 	going through the CPU's backlog queue.
3641 |  *
3642 |  * 	The *flags* argument is reserved and must be 0. The helper is
3643 |  * 	currently only supported for tc BPF program types at the ingress
3644 |  * 	hook and for veth device types. The peer device must reside in a
3645 |  * 	different network namespace.
3646 |  *
3647 |  * Returns
3648 |  * 	The helper returns **TC_ACT_REDIRECT** on success or
3649 |  * 	**TC_ACT_SHOT** on error.
3650 |  */
3651 | static long (*bpf_redirect_peer)(__u32 ifindex, __u64 flags) = (void *) 155;
3652 | 
3653 | /*
3654 |  * bpf_task_storage_get
3655 |  *
3656 |  * 	Get a bpf_local_storage from the *task*.
3657 |  *
3658 |  * 	Logically, it could be thought of as getting the value from
3659 |  * 	a *map* with *task* as the **key**.  From this
3660 |  * 	perspective,  the usage is not much different from
3661 |  * 	**bpf_map_lookup_elem**\ (*map*, **&**\ *task*) except this
3662 |  * 	helper enforces the key must be an task_struct and the map must also
3663 |  * 	be a **BPF_MAP_TYPE_TASK_STORAGE**.
3664 |  *
3665 |  * 	Underneath, the value is stored locally at *task* instead of
3666 |  * 	the *map*.  The *map* is used as the bpf-local-storage
3667 |  * 	"type". The bpf-local-storage "type" (i.e. the *map*) is
3668 |  * 	searched against all bpf_local_storage residing at *task*.
3669 |  *
3670 |  * 	An optional *flags* (**BPF_LOCAL_STORAGE_GET_F_CREATE**) can be
3671 |  * 	used such that a new bpf_local_storage will be
3672 |  * 	created if one does not exist.  *value* can be used
3673 |  * 	together with **BPF_LOCAL_STORAGE_GET_F_CREATE** to specify
3674 |  * 	the initial value of a bpf_local_storage.  If *value* is
3675 |  * 	**NULL**, the new bpf_local_storage will be zero initialized.
3676 |  *
3677 |  * Returns
3678 |  * 	A bpf_local_storage pointer is returned on success.
3679 |  *
3680 |  * 	**NULL** if not found or there was an error in adding
3681 |  * 	a new bpf_local_storage.
3682 |  */
3683 | static void *(*bpf_task_storage_get)(void *map, struct task_struct *task, void *value, __u64 flags) = (void *) 156;
3684 | 
3685 | /*
3686 |  * bpf_task_storage_delete
3687 |  *
3688 |  * 	Delete a bpf_local_storage from a *task*.
3689 |  *
3690 |  * Returns
3691 |  * 	0 on success.
3692 |  *
3693 |  * 	**-ENOENT** if the bpf_local_storage cannot be found.
3694 |  */
3695 | static long (*bpf_task_storage_delete)(void *map, struct task_struct *task) = (void *) 157;
3696 | 
3697 | /*
3698 |  * bpf_get_current_task_btf
3699 |  *
3700 |  * 	Return a BTF pointer to the "current" task.
3701 |  * 	This pointer can also be used in helpers that accept an
3702 |  * 	*ARG_PTR_TO_BTF_ID* of type *task_struct*.
3703 |  *
3704 |  * Returns
3705 |  * 	Pointer to the current task.
3706 |  */
3707 | static struct task_struct *(*bpf_get_current_task_btf)(void) = (void *) 158;
3708 | 
3709 | /*
3710 |  * bpf_bprm_opts_set
3711 |  *
3712 |  * 	Set or clear certain options on *bprm*:
3713 |  *
3714 |  * 	**BPF_F_BPRM_SECUREEXEC** Set the secureexec bit
3715 |  * 	which sets the **AT_SECURE** auxv for glibc. The bit
3716 |  * 	is cleared if the flag is not specified.
3717 |  *
3718 |  * Returns
3719 |  * 	**-EINVAL** if invalid *flags* are passed, zero otherwise.
3720 |  */
3721 | static long (*bpf_bprm_opts_set)(struct linux_binprm *bprm, __u64 flags) = (void *) 159;
3722 | 
3723 | /*
3724 |  * bpf_ktime_get_coarse_ns
3725 |  *
3726 |  * 	Return a coarse-grained version of the time elapsed since
3727 |  * 	system boot, in nanoseconds. Does not include time the system
3728 |  * 	was suspended.
3729 |  *
3730 |  * 	See: **clock_gettime**\ (**CLOCK_MONOTONIC_COARSE**)
3731 |  *
3732 |  * Returns
3733 |  * 	Current *ktime*.
3734 |  */
3735 | static __u64 (*bpf_ktime_get_coarse_ns)(void) = (void *) 160;
3736 | 
3737 | /*
3738 |  * bpf_ima_inode_hash
3739 |  *
3740 |  * 	Returns the stored IMA hash of the *inode* (if it's avaialable).
3741 |  * 	If the hash is larger than *size*, then only *size*
3742 |  * 	bytes will be copied to *dst*
3743 |  *
3744 |  * Returns
3745 |  * 	The **hash_algo** is returned on success,
3746 |  * 	**-EOPNOTSUP** if IMA is disabled or **-EINVAL** if
3747 |  * 	invalid arguments are passed.
3748 |  */
3749 | static long (*bpf_ima_inode_hash)(struct inode *inode, void *dst, __u32 size) = (void *) 161;
3750 | 
3751 | /*
3752 |  * bpf_sock_from_file
3753 |  *
3754 |  * 	If the given file represents a socket, returns the associated
3755 |  * 	socket.
3756 |  *
3757 |  * Returns
3758 |  * 	A pointer to a struct socket on success or NULL if the file is
3759 |  * 	not a socket.
3760 |  */
3761 | static struct socket *(*bpf_sock_from_file)(struct file *file) = (void *) 162;
3762 | 
3763 | /*
3764 |  * bpf_check_mtu
3765 |  *
3766 |  * 	Check packet size against exceeding MTU of net device (based
3767 |  * 	on *ifindex*).  This helper will likely be used in combination
3768 |  * 	with helpers that adjust/change the packet size.
3769 |  *
3770 |  * 	The argument *len_diff* can be used for querying with a planned
3771 |  * 	size change. This allows to check MTU prior to changing packet
3772 |  * 	ctx. Providing an *len_diff* adjustment that is larger than the
3773 |  * 	actual packet size (resulting in negative packet size) will in
3774 |  * 	principle not exceed the MTU, why it is not considered a
3775 |  * 	failure.  Other BPF-helpers are needed for performing the
3776 |  * 	planned size change, why the responsability for catch a negative
3777 |  * 	packet size belong in those helpers.
3778 |  *
3779 |  * 	Specifying *ifindex* zero means the MTU check is performed
3780 |  * 	against the current net device.  This is practical if this isn't
3781 |  * 	used prior to redirect.
3782 |  *
3783 |  * 	On input *mtu_len* must be a valid pointer, else verifier will
3784 |  * 	reject BPF program.  If the value *mtu_len* is initialized to
3785 |  * 	zero then the ctx packet size is use.  When value *mtu_len* is
3786 |  * 	provided as input this specify the L3 length that the MTU check
3787 |  * 	is done against. Remember XDP and TC length operate at L2, but
3788 |  * 	this value is L3 as this correlate to MTU and IP-header tot_len
3789 |  * 	values which are L3 (similar behavior as bpf_fib_lookup).
3790 |  *
3791 |  * 	The Linux kernel route table can configure MTUs on a more
3792 |  * 	specific per route level, which is not provided by this helper.
3793 |  * 	For route level MTU checks use the **bpf_fib_lookup**\ ()
3794 |  * 	helper.
3795 |  *
3796 |  * 	*ctx* is either **struct xdp_md** for XDP programs or
3797 |  * 	**struct sk_buff** for tc cls_act programs.
3798 |  *
3799 |  * 	The *flags* argument can be a combination of one or more of the
3800 |  * 	following values:
3801 |  *
3802 |  * 	**BPF_MTU_CHK_SEGS**
3803 |  * 		This flag will only works for *ctx* **struct sk_buff**.
3804 |  * 		If packet context contains extra packet segment buffers
3805 |  * 		(often knows as GSO skb), then MTU check is harder to
3806 |  * 		check at this point, because in transmit path it is
3807 |  * 		possible for the skb packet to get re-segmented
3808 |  * 		(depending on net device features).  This could still be
3809 |  * 		a MTU violation, so this flag enables performing MTU
3810 |  * 		check against segments, with a different violation
3811 |  * 		return code to tell it apart. Check cannot use len_diff.
3812 |  *
3813 |  * 	On return *mtu_len* pointer contains the MTU value of the net
3814 |  * 	device.  Remember the net device configured MTU is the L3 size,
3815 |  * 	which is returned here and XDP and TC length operate at L2.
3816 |  * 	Helper take this into account for you, but remember when using
3817 |  * 	MTU value in your BPF-code.
3818 |  *
3819 |  *
3820 |  * Returns
3821 |  * 	* 0 on success, and populate MTU value in *mtu_len* pointer.
3822 |  *
3823 |  * 	* < 0 if any input argument is invalid (*mtu_len* not updated)
3824 |  *
3825 |  * 	MTU violations return positive values, but also populate MTU
3826 |  * 	value in *mtu_len* pointer, as this can be needed for
3827 |  * 	implementing PMTU handing:
3828 |  *
3829 |  * 	* **BPF_MTU_CHK_RET_FRAG_NEEDED**
3830 |  * 	* **BPF_MTU_CHK_RET_SEGS_TOOBIG**
3831 |  */
3832 | static long (*bpf_check_mtu)(void *ctx, __u32 ifindex, __u32 *mtu_len, __s32 len_diff, __u64 flags) = (void *) 163;
3833 | 
3834 | /*
3835 |  * bpf_for_each_map_elem
3836 |  *
3837 |  * 	For each element in **map**, call **callback_fn** function with
3838 |  * 	**map**, **callback_ctx** and other map-specific parameters.
3839 |  * 	The **callback_fn** should be a static function and
3840 |  * 	the **callback_ctx** should be a pointer to the stack.
3841 |  * 	The **flags** is used to control certain aspects of the helper.
3842 |  * 	Currently, the **flags** must be 0.
3843 |  *
3844 |  * 	The following are a list of supported map types and their
3845 |  * 	respective expected callback signatures:
3846 |  *
3847 |  * 	BPF_MAP_TYPE_HASH, BPF_MAP_TYPE_PERCPU_HASH,
3848 |  * 	BPF_MAP_TYPE_LRU_HASH, BPF_MAP_TYPE_LRU_PERCPU_HASH,
3849 |  * 	BPF_MAP_TYPE_ARRAY, BPF_MAP_TYPE_PERCPU_ARRAY
3850 |  *
3851 |  * 	long (\*callback_fn)(struct bpf_map \*map, const void \*key, void \*value, void \*ctx);
3852 |  *
3853 |  * 	For per_cpu maps, the map_value is the value on the cpu where the
3854 |  * 	bpf_prog is running.
3855 |  *
3856 |  * 	If **callback_fn** return 0, the helper will continue to the next
3857 |  * 	element. If return value is 1, the helper will skip the rest of
3858 |  * 	elements and return. Other return values are not used now.
3859 |  *
3860 |  *
3861 |  * Returns
3862 |  * 	The number of traversed map elements for success, **-EINVAL** for
3863 |  * 	invalid **flags**.
3864 |  */
3865 | static long (*bpf_for_each_map_elem)(void *map, void *callback_fn, void *callback_ctx, __u64 flags) = (void *) 164;
3866 | 
3867 | /*
3868 |  * bpf_snprintf
3869 |  *
3870 |  * 	Outputs a string into the **str** buffer of size **str_size**
3871 |  * 	based on a format string stored in a read-only map pointed by
3872 |  * 	**fmt**.
3873 |  *
3874 |  * 	Each format specifier in **fmt** corresponds to one u64 element
3875 |  * 	in the **data** array. For strings and pointers where pointees
3876 |  * 	are accessed, only the pointer values are stored in the *data*
3877 |  * 	array. The *data_len* is the size of *data* in bytes - must be
3878 |  * 	a multiple of 8.
3879 |  *
3880 |  * 	Formats **%s** and **%p{i,I}{4,6}** require to read kernel
3881 |  * 	memory. Reading kernel memory may fail due to either invalid
3882 |  * 	address or valid address but requiring a major memory fault. If
3883 |  * 	reading kernel memory fails, the string for **%s** will be an
3884 |  * 	empty string, and the ip address for **%p{i,I}{4,6}** will be 0.
3885 |  * 	Not returning error to bpf program is consistent with what
3886 |  * 	**bpf_trace_printk**\ () does for now.
3887 |  *
3888 |  *
3889 |  * Returns
3890 |  * 	The strictly positive length of the formatted string, including
3891 |  * 	the trailing zero character. If the return value is greater than
3892 |  * 	**str_size**, **str** contains a truncated string, guaranteed to
3893 |  * 	be zero-terminated except when **str_size** is 0.
3894 |  *
3895 |  * 	Or **-EBUSY** if the per-CPU memory copy buffer is busy.
3896 |  */
3897 | static long (*bpf_snprintf)(char *str, __u32 str_size, const char *fmt, __u64 *data, __u32 data_len) = (void *) 165;
3898 | 
3899 | /*
3900 |  * bpf_sys_bpf
3901 |  *
3902 |  * 	Execute bpf syscall with given arguments.
3903 |  *
3904 |  * Returns
3905 |  * 	A syscall result.
3906 |  */
3907 | static long (*bpf_sys_bpf)(__u32 cmd, void *attr, __u32 attr_size) = (void *) 166;
3908 | 
3909 | /*
3910 |  * bpf_btf_find_by_name_kind
3911 |  *
3912 |  * 	Find BTF type with given name and kind in vmlinux BTF or in module's BTFs.
3913 |  *
3914 |  * Returns
3915 |  * 	Returns btf_id and btf_obj_fd in lower and upper 32 bits.
3916 |  */
3917 | static long (*bpf_btf_find_by_name_kind)(char *name, int name_sz, __u32 kind, int flags) = (void *) 167;
3918 | 
3919 | /*
3920 |  * bpf_sys_close
3921 |  *
3922 |  * 	Execute close syscall for given FD.
3923 |  *
3924 |  * Returns
3925 |  * 	A syscall result.
3926 |  */
3927 | static long (*bpf_sys_close)(__u32 fd) = (void *) 168;
3928 | 
3929 | /*
3930 |  * bpf_timer_init
3931 |  *
3932 |  * 	Initialize the timer.
3933 |  * 	First 4 bits of *flags* specify clockid.
3934 |  * 	Only CLOCK_MONOTONIC, CLOCK_REALTIME, CLOCK_BOOTTIME are allowed.
3935 |  * 	All other bits of *flags* are reserved.
3936 |  * 	The verifier will reject the program if *timer* is not from
3937 |  * 	the same *map*.
3938 |  *
3939 |  * Returns
3940 |  * 	0 on success.
3941 |  * 	**-EBUSY** if *timer* is already initialized.
3942 |  * 	**-EINVAL** if invalid *flags* are passed.
3943 |  * 	**-EPERM** if *timer* is in a map that doesn't have any user references.
3944 |  * 	The user space should either hold a file descriptor to a map with timers
3945 |  * 	or pin such map in bpffs. When map is unpinned or file descriptor is
3946 |  * 	closed all timers in the map will be cancelled and freed.
3947 |  */
3948 | static long (*bpf_timer_init)(struct bpf_timer *timer, void *map, __u64 flags) = (void *) 169;
3949 | 
3950 | /*
3951 |  * bpf_timer_set_callback
3952 |  *
3953 |  * 	Configure the timer to call *callback_fn* static function.
3954 |  *
3955 |  * Returns
3956 |  * 	0 on success.
3957 |  * 	**-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier.
3958 |  * 	**-EPERM** if *timer* is in a map that doesn't have any user references.
3959 |  * 	The user space should either hold a file descriptor to a map with timers
3960 |  * 	or pin such map in bpffs. When map is unpinned or file descriptor is
3961 |  * 	closed all timers in the map will be cancelled and freed.
3962 |  */
3963 | static long (*bpf_timer_set_callback)(struct bpf_timer *timer, void *callback_fn) = (void *) 170;
3964 | 
3965 | /*
3966 |  * bpf_timer_start
3967 |  *
3968 |  * 	Set timer expiration N nanoseconds from the current time. The
3969 |  * 	configured callback will be invoked in soft irq context on some cpu
3970 |  * 	and will not repeat unless another bpf_timer_start() is made.
3971 |  * 	In such case the next invocation can migrate to a different cpu.
3972 |  * 	Since struct bpf_timer is a field inside map element the map
3973 |  * 	owns the timer. The bpf_timer_set_callback() will increment refcnt
3974 |  * 	of BPF program to make sure that callback_fn code stays valid.
3975 |  * 	When user space reference to a map reaches zero all timers
3976 |  * 	in a map are cancelled and corresponding program's refcnts are
3977 |  * 	decremented. This is done to make sure that Ctrl-C of a user
3978 |  * 	process doesn't leave any timers running. If map is pinned in
3979 |  * 	bpffs the callback_fn can re-arm itself indefinitely.
3980 |  * 	bpf_map_update/delete_elem() helpers and user space sys_bpf commands
3981 |  * 	cancel and free the timer in the given map element.
3982 |  * 	The map can contain timers that invoke callback_fn-s from different
3983 |  * 	programs. The same callback_fn can serve different timers from
3984 |  * 	different maps if key/value layout matches across maps.
3985 |  * 	Every bpf_timer_set_callback() can have different callback_fn.
3986 |  *
3987 |  *
3988 |  * Returns
3989 |  * 	0 on success.
3990 |  * 	**-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier
3991 |  * 	or invalid *flags* are passed.
3992 |  */
3993 | static long (*bpf_timer_start)(struct bpf_timer *timer, __u64 nsecs, __u64 flags) = (void *) 171;
3994 | 
3995 | /*
3996 |  * bpf_timer_cancel
3997 |  *
3998 |  * 	Cancel the timer and wait for callback_fn to finish if it was running.
3999 |  *
4000 |  * Returns
4001 |  * 	0 if the timer was not active.
4002 |  * 	1 if the timer was active.
4003 |  * 	**-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier.
4004 |  * 	**-EDEADLK** if callback_fn tried to call bpf_timer_cancel() on its
4005 |  * 	own timer which would have led to a deadlock otherwise.
4006 |  */
4007 | static long (*bpf_timer_cancel)(struct bpf_timer *timer) = (void *) 172;
4008 | 
4009 | /*
4010 |  * bpf_get_func_ip
4011 |  *
4012 |  * 	Get address of the traced function (for tracing and kprobe programs).
4013 |  *
4014 |  * Returns
4015 |  * 	Address of the traced function.
4016 |  */
4017 | static __u64 (*bpf_get_func_ip)(void *ctx) = (void *) 173;
4018 | 
4019 | /*
4020 |  * bpf_get_attach_cookie
4021 |  *
4022 |  * 	Get bpf_cookie value provided (optionally) during the program
4023 |  * 	attachment. It might be different for each individual
4024 |  * 	attachment, even if BPF program itself is the same.
4025 |  * 	Expects BPF program context *ctx* as a first argument.
4026 |  *
4027 |  * 	Supported for the following program types:
4028 |  * 		- kprobe/uprobe;
4029 |  * 		- tracepoint;
4030 |  * 		- perf_event.
4031 |  *
4032 |  * Returns
4033 |  * 	Value specified by user at BPF link creation/attachment time
4034 |  * 	or 0, if it was not specified.
4035 |  */
4036 | static __u64 (*bpf_get_attach_cookie)(void *ctx) = (void *) 174;
4037 | 
4038 | /*
4039 |  * bpf_task_pt_regs
4040 |  *
4041 |  * 	Get the struct pt_regs associated with **task**.
4042 |  *
4043 |  * Returns
4044 |  * 	A pointer to struct pt_regs.
4045 |  */
4046 | static long (*bpf_task_pt_regs)(struct task_struct *task) = (void *) 175;
4047 | 
4048 | /*
4049 |  * bpf_get_branch_snapshot
4050 |  *
4051 |  * 	Get branch trace from hardware engines like Intel LBR. The
4052 |  * 	hardware engine is stopped shortly after the helper is
4053 |  * 	called. Therefore, the user need to filter branch entries
4054 |  * 	based on the actual use case. To capture branch trace
4055 |  * 	before the trigger point of the BPF program, the helper
4056 |  * 	should be called at the beginning of the BPF program.
4057 |  *
4058 |  * 	The data is stored as struct perf_branch_entry into output
4059 |  * 	buffer *entries*. *size* is the size of *entries* in bytes.
4060 |  * 	*flags* is reserved for now and must be zero.
4061 |  *
4062 |  *
4063 |  * Returns
4064 |  * 	On success, number of bytes written to *buf*. On error, a
4065 |  * 	negative value.
4066 |  *
4067 |  * 	**-EINVAL** if *flags* is not zero.
4068 |  *
4069 |  * 	**-ENOENT** if architecture does not support branch records.
4070 |  */
4071 | static long (*bpf_get_branch_snapshot)(void *entries, __u32 size, __u64 flags) = (void *) 176;
4072 | 
4073 | /*
4074 |  * bpf_trace_vprintk
4075 |  *
4076 |  * 	Behaves like **bpf_trace_printk**\ () helper, but takes an array of u64
4077 |  * 	to format and can handle more format args as a result.
4078 |  *
4079 |  * 	Arguments are to be used as in **bpf_seq_printf**\ () helper.
4080 |  *
4081 |  * Returns
4082 |  * 	The number of bytes written to the buffer, or a negative error
4083 |  * 	in case of failure.
4084 |  */
4085 | static long (*bpf_trace_vprintk)(const char *fmt, __u32 fmt_size, const void *data, __u32 data_len) = (void *) 177;
4086 | 
4087 | /*
4088 |  * bpf_skc_to_unix_sock
4089 |  *
4090 |  * 	Dynamically cast a *sk* pointer to a *unix_sock* pointer.
4091 |  *
4092 |  * Returns
4093 |  * 	*sk* if casting is valid, or **NULL** otherwise.
4094 |  */
4095 | static struct unix_sock *(*bpf_skc_to_unix_sock)(void *sk) = (void *) 178;
4096 | 
4097 | /*
4098 |  * bpf_kallsyms_lookup_name
4099 |  *
4100 |  * 	Get the address of a kernel symbol, returned in *res*. *res* is
4101 |  * 	set to 0 if the symbol is not found.
4102 |  *
4103 |  * Returns
4104 |  * 	On success, zero. On error, a negative value.
4105 |  *
4106 |  * 	**-EINVAL** if *flags* is not zero.
4107 |  *
4108 |  * 	**-EINVAL** if string *name* is not the same size as *name_sz*.
4109 |  *
4110 |  * 	**-ENOENT** if symbol is not found.
4111 |  *
4112 |  * 	**-EPERM** if caller does not have permission to obtain kernel address.
4113 |  */
4114 | static long (*bpf_kallsyms_lookup_name)(const char *name, int name_sz, int flags, __u64 *res) = (void *) 179;
4115 | 
4116 | /*
4117 |  * bpf_find_vma
4118 |  *
4119 |  * 	Find vma of *task* that contains *addr*, call *callback_fn*
4120 |  * 	function with *task*, *vma*, and *callback_ctx*.
4121 |  * 	The *callback_fn* should be a static function and
4122 |  * 	the *callback_ctx* should be a pointer to the stack.
4123 |  * 	The *flags* is used to control certain aspects of the helper.
4124 |  * 	Currently, the *flags* must be 0.
4125 |  *
4126 |  * 	The expected callback signature is
4127 |  *
4128 |  * 	long (\*callback_fn)(struct task_struct \*task, struct vm_area_struct \*vma, void \*callback_ctx);
4129 |  *
4130 |  *
4131 |  * Returns
4132 |  * 	0 on success.
4133 |  * 	**-ENOENT** if *task->mm* is NULL, or no vma contains *addr*.
4134 |  * 	**-EBUSY** if failed to try lock mmap_lock.
4135 |  * 	**-EINVAL** for invalid **flags**.
4136 |  */
4137 | static long (*bpf_find_vma)(struct task_struct *task, __u64 addr, void *callback_fn, void *callback_ctx, __u64 flags) = (void *) 180;
4138 | 
4139 | 
4140 | 


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