├── .gitignore ├── CONTRIBUTING ├── LICENSE ├── Makefile.am ├── README.md ├── VERSION ├── bootstrap ├── configure.ac ├── src ├── Makefile.am ├── main.c ├── udp_publisher.c ├── unyte_reuseport_kern.c ├── unyte_reuseport_user.c └── unyte_reuseport_user.h └── unyte-reuseport-loadbalancer.pc.in /.gitignore: -------------------------------------------------------------------------------- 1 | # Prerequisites 2 | *.d 3 | 4 | # Object files 5 | *.o 6 | *.ko 7 | *.obj 8 | *.elf 9 | 10 | # Linker output 11 | *.ilk 12 | *.map 13 | *.exp 14 | 15 | # Precompiled Headers 16 | *.gch 17 | *.pch 18 | 19 | # Libraries 20 | *.lib 21 | *.a 22 | *.la 23 | *.lo 24 | 25 | # Shared objects (inc. Windows DLLs) 26 | *.dll 27 | *.so 28 | *.so.* 29 | *.dylib 30 | 31 | # Executables 32 | *.exe 33 | *.out 34 | *.app 35 | *.i*86 36 | *.x86_64 37 | *.hex 38 | 39 | # Debug files 40 | *.dSYM/ 41 | *.su 42 | *.idb 43 | *.pdb 44 | 45 | # Kernel Module Compile Results 46 | *.mod* 47 | *.cmd 48 | .tmp_versions/ 49 | modules.order 50 | Module.symvers 51 | Mkfile.old 52 | dkms.conf 53 | 54 | # http://www.gnu.org/software/autoconf 55 | autom4te.cache 56 | /autoscan.log 57 | /autoscan-*.log 58 | /aclocal.m4 59 | /compile 60 | /config.cache 61 | /config.guess 62 | /config.h.in 63 | /config.log 64 | /config.status 65 | /config.sub 66 | /configure 67 | /configure.scan 68 | /depcomp 69 | /install-sh 70 | /missing 71 | /stamp-h1 72 | 73 | # https://www.gnu.org/software/libtool/ 74 | 75 | /ltmain.sh 76 | 77 | # http://www.gnu.org/software/texinfo 78 | 79 | /texinfo.tex 80 | 81 | # http://www.gnu.org/software/m4/ 82 | 83 | m4/libtool.m4 84 | m4/ltoptions.m4 85 | m4/ltsugar.m4 86 | m4/ltversion.m4 87 | m4/lt~obsolete.m4 88 | 89 | *.lo 90 | Makefile 91 | 92 | build-aux 93 | Makefile.in 94 | /ar-lib 95 | /mdate-sh 96 | /py-compile 97 | /test-driver 98 | /ylwrap 99 | .deps/ 100 | .libs/ 101 | .dirstamp 102 | build-aux/ 103 | build/ 104 | libtool 105 | config.h 106 | vmlinux.h 107 | own_commands 108 | unyte-reuseport-loadbalancer.pc 109 | 110 | # executables 111 | main 112 | udp_publisher 113 | 114 | # IDE 115 | .vscode 116 | -------------------------------------------------------------------------------- /CONTRIBUTING: -------------------------------------------------------------------------------- 1 | # Contributing 2 | 3 | When contributing to this repository, please first discuss the change you wish to make via issue, 4 | email, or any other method with the owners of this repository before making a change. 5 | 6 | Please note we have a code of conduct, please follow it in all your interactions with the project. 7 | 8 | ## Pull Request Process 9 | 10 | 1. Ensure any install or build dependencies are removed before the end of the layer when doing a 11 | build. 12 | 2. Update the README.md with details of changes to the interface, this includes new environment 13 | variables, exposed ports, useful file locations and container parameters. 14 | 3. Increase the version numbers in any examples files and the README.md to the new version that this 15 | Pull Request would represent if a bump version is required. 16 | 17 | ## Code of Conduct 18 | 19 | ### Our Pledge 20 | 21 | In the interest of fostering an open and welcoming environment, we as 22 | contributors and maintainers pledge to making participation in our project and 23 | our community a harassment-free experience for everyone, regardless of age, body 24 | size, disability, ethnicity, gender identity and expression, level of experience, 25 | nationality, personal appearance, race, religion, or sexual identity and 26 | orientation. 27 | 28 | ### Our Standards 29 | 30 | Examples of behavior that contributes to creating a positive environment 31 | include: 32 | 33 | * Using welcoming and inclusive language 34 | * Being respectful of differing viewpoints and experiences 35 | * Gracefully accepting constructive criticism 36 | * Focusing on what is best for the community 37 | * Showing empathy towards other community members 38 | 39 | Examples of unacceptable behavior by participants include: 40 | 41 | * The use of sexualized language or imagery and unwelcome sexual attention or 42 | advances 43 | * Trolling, insulting/derogatory comments, and personal or political attacks 44 | * Public or private harassment 45 | * Publishing others' private information, such as a physical or electronic 46 | address, without explicit permission 47 | * Other conduct which could reasonably be considered inappropriate in a 48 | professional setting 49 | 50 | ### Our Responsibilities 51 | 52 | Project maintainers are responsible for clarifying the standards of acceptable 53 | behavior and are expected to take appropriate and fair corrective action in 54 | response to any instances of unacceptable behavior. 55 | 56 | Project maintainers have the right and responsibility to remove, edit, or 57 | reject comments, commits, code, wiki edits, issues, and other contributions 58 | that are not aligned to this Code of Conduct, or to ban temporarily or 59 | permanently any contributor for other behaviors that they deem inappropriate, 60 | threatening, offensive, or harmful. 61 | 62 | ### Scope 63 | 64 | This Code of Conduct applies both within project spaces and in public spaces 65 | when an individual is representing the project or its community. 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Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . -------------------------------------------------------------------------------- /Makefile.am: -------------------------------------------------------------------------------- 1 | AM_LDFLAGS = $(EXTRA_LDFLAGS) 2 | 3 | SUBDIRS = src 4 | 5 | ACLOCAL_AMFLAGS = -I m4 6 | 7 | # PKGCONFIG_USER comes from configure.ac 8 | pkgconfigdir = $(PKGCONFIG_USER) 9 | pkgconfig_DATA = \ 10 | unyte-reuseport-loadbalancer.pc \ 11 | $(NULL) 12 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # eBPF Load balancer 2 | Linux eBPF load balancer to be attached into SO_REUSEPORT socket group. 3 | 4 | This eBPF program allows load balance packets based on their src IP. All packets from the same src IP will land into the same collector. 5 | 6 | ## Dependencies 7 | This project uses autotools, gcc and clang to compile. 8 | 9 | On Ubuntu: 10 | ```shell 11 | $ sudo apt install autoconf libtool make automake gcc pkg-config 12 | ``` 13 | 14 | On Centos (tested on `Centos 8`): 15 | ```shell 16 | $ sudo yum install autoconf libtool make automake pkgconf 17 | ``` 18 | 19 | ### eBPF Dependencies 20 | 21 | To use eBPF loadbalancing `Python3` is needed for eBPF compilation. 22 | Another requirement is `libbpf` (github.com/libbpf/libbpf) >= 0.4.0. 23 | 24 | On Ubuntu: 25 | ```shell 26 | $ sudo apt install clang libbpf-dev linux-tools-$(uname -r) 27 | ``` 28 | 29 | On Centos (tested on `Centos 8`): 30 | ```shell 31 | $ sudo yum install clang 32 | $ sudo dnf --enablerepo=powertools install libbpf-devel 33 | $ sudo dnf install bpftool 34 | ``` 35 | 36 | ## Install 37 | To install src code: 38 | ```shell 39 | $ ./bootstrap 40 | $ ./configure # See ./configure --help for options 41 | $ make 42 | $ make install # Usually needs sudo permissions 43 | ``` 44 | 45 | ### Configure options 46 | There are some custom `./configure` options : 47 | - `--with-pkgconfigdir=[/own_path/pkgconfig]`: overwrite pkgconfig directory to install .pc file [default: ${PREFIX}/lib/pkgconfig] 48 | - `--with-linux=[/own_path/linux/src]`: linux source code necesary for eBPF compilation [default: /usr/src/linux]. (On Ubuntu use /usr/src/-generic version) 49 | - `--enable-debug`: enable logs in both user-space and kernel-space eBPF program. 50 | 51 | ## Usage 52 | See [main](src/main.c) example. This example initializes an UDP socket bound to an address/port and attaches the eBPF load balancer to the socket. 53 | 54 | There is a [udp_publisher](src/udp_publisher.c) to test the collector. 55 | 56 | ## Running 57 | To test the loadbalancer, multiple instances should be launched. In this example, messages will be loadbalanced to 3 instances based on their src IP. 58 | 59 | To run 3 collectors: 60 | ```shell 61 | $ cd src 62 | $ sudo bash -c 'ulimit -l unlimited; ./main 10.0.2.15 10001 0 3' // first collector 63 | $ sudo bash -c 'ulimit -l unlimited; ./main 10.0.2.15 10001 1 3' // second collector 64 | $ sudo bash -c 'ulimit -l unlimited; ./main 10.0.2.15 10001 2 3' // third collector 65 | ``` 66 | 67 | To see the loadbalancer working, you should instance multiple publishers sending from different src ips, otherwise, all packets will be hashed to the same collector. 68 | 69 | Publisher: 70 | ```shell 71 | $ cd src 72 | $ ./udp_publisher 10.0.2.15 10001 100 73 | ``` 74 | 75 | ## Debug 76 | To show the maps: 77 | 78 | (`sudo` may be needed) 79 | ```shell 80 | $ bpftool map dump name tcp_balancing_t 81 | $ bpftool map dump name udp_balancing_t 82 | ``` 83 | 84 | Logs in eBPF program can be activated using the flag `--enable-debug` of autotools. 85 | Logs for eBPF program are in `/sys/kernel/debug/tracing/trace` 86 | 87 | ## Credits 88 | This repository is based on [reuseport](https://github.com/eduarrrd/reuseport), a loadbalancer used in pmacct. 89 | -------------------------------------------------------------------------------- /VERSION: -------------------------------------------------------------------------------- 1 | 0.1.1-git -------------------------------------------------------------------------------- /bootstrap: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | # create m4 directory if does not exist 4 | [ -d m4 ] || mkdir m4 5 | 6 | AUTORECONF=${AUTORECONF:-autoreconf} 7 | 8 | # Check we have all tools installed 9 | check_command() { 10 | command -v "${1}" > /dev/null 2>&1 || { 11 | >&2 echo "./bootstrap: could not find \`$1'. \`$1' is required to run bootstrap." 12 | exit 1 13 | } 14 | } 15 | 16 | check_command "$AUTORECONF" 17 | 18 | autoreconf --install 19 | 20 | exit 0 21 | -------------------------------------------------------------------------------- /configure.ac: -------------------------------------------------------------------------------- 1 | AC_INIT([unyte_ebpf_loadbalancer], m4_esyscmd_s(cat VERSION), [alex.huang-feng@insa-lyon.fr]) 2 | AC_CONFIG_AUX_DIR([build-aux]) 3 | 4 | AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects]) 5 | 6 | AC_CONFIG_MACRO_DIR([m4]) 7 | AC_PREFIX_DEFAULT([/usr/local]) 8 | 9 | AM_PROG_AR 10 | LT_INIT 11 | 12 | AC_LANG([C]) 13 | AC_CONFIG_HEADERS([config.h]) 14 | AC_PROG_CC([gcc]) 15 | 16 | AC_PROG_LN_S 17 | 18 | AC_ARG_WITH([pkgconfigdir], 19 | [AS_HELP_STRING([--with-pkgconfigdir], [pkg-config directory to install the .pc file.])], 20 | [ with_pkgconfigdir=$with_pkgconfigdir ], 21 | [ with_pkgconfigdir=$libdir/pkgconfig ] 22 | ) 23 | 24 | PKGCONFIG_USER=$with_pkgconfigdir 25 | AC_SUBST([PKGCONFIG_USER]) 26 | 27 | AC_ARG_ENABLE([debug], 28 | [AS_HELP_STRING([--enable-debug], [Enable debug logs in eBPF program.])], 29 | [ debug_enabled=yes ], 30 | [ debug_enabled=no ] 31 | ) 32 | AM_CONDITIONAL(DEBUG, test "x$debug_enabled" = "xyes") 33 | 34 | dnl eBPF example 35 | AC_CHECK_LIB(bpf, bpf_object__find_map_by_name, [], [ 36 | echo "*** Error! You need to install libbpf first. ***" 37 | exit -1 38 | ]) 39 | 40 | AC_CHECK_PROG([CCLANG], [clang], [yes]) 41 | AS_IF([ test "x$CCLANG" != xyes ], [ 42 | echo "*** Error! eBPF needs CLANG as dependency. Please install it first. ***" 43 | exit -1 44 | ]) 45 | AC_CHECK_PROG([BPFTOOL], [bpftool], [yes]) 46 | AS_IF([ test "x$BPFTOOL" != xyes ], [ 47 | echo "*** Error! eBPF needs bpftool as dependency. Please install it first. ***" 48 | exit -1 49 | ]) 50 | 51 | AC_CHECK_FILE([/sys/kernel/btf/vmlinux], [], [ 52 | echo "*** Error! eBPF needs vmlinux to compile the eBPF program. ***" 53 | exit -1 54 | ]) 55 | 56 | AC_CONFIG_FILES([ 57 | Makefile 58 | src/Makefile 59 | unyte-reuseport-loadbalancer.pc 60 | ]) 61 | AC_OUTPUT 62 | -------------------------------------------------------------------------------- /src/Makefile.am: -------------------------------------------------------------------------------- 1 | AM_LDFLAGS = $(EXTRA_LDFLAGS) 2 | 3 | if DEBUG 4 | DEBUG_FLAGS=-D_LOG_DEBUG 5 | endif 6 | 7 | ACLOCAL_AMFLAGS = -I m4 8 | 9 | EBPF_CLDFLAGS=-fcolor-diagnostics -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -g -fPIC -g -O2 -D__KERNEL__ -D__TARGET_ARCH_x86 --target=bpf -Wall -Wno-macro-redefined -D__BPF_TRACING__ 10 | 11 | vmlinux.h: 12 | bpftool btf dump file /sys/kernel/btf/vmlinux format c > $@ 13 | 14 | unyte_reuseport_kern.o: unyte_reuseport_kern.c vmlinux.h 15 | clang $(EBPF_CLDFLAGS) $(DEBUG_FLAGS) -o $@ -c $< 16 | 17 | all-local: unyte_reuseport_kern.o 18 | 19 | unyte_reuseport_kern_odir = $(libdir) 20 | unyte_reuseport_kern_o_DATA = \ 21 | unyte_reuseport_kern.o \ 22 | $(NULL) 23 | 24 | unyteincludedir = $(includedir)/unyte-reuseport-loadbalancer 25 | unyteinclude_HEADERS = \ 26 | unyte_reuseport_user.h \ 27 | $(NULL) 28 | 29 | bin_PROGRAMS = main udp_publisher 30 | 31 | main_SOURCES = main.c unyte_reuseport_user.c 32 | main_CFLAGS = -I$(srcdir)/../../src -Wextra -Wall -ansi -g -std=c11 -D_GNU_SOURCE -fPIC -pthread $(DEBUG_FLAGS) 33 | # main_LDADD = $(srcdir)/../../src/libunyte-reuseport-loadbalancer.la 34 | 35 | udp_publisher_SOURCES = udp_publisher.c 36 | udp_publisher_CFLAGS = -I$(srcdir)/../../src -Wextra -Wall -ansi -g -std=c11 -D_GNU_SOURCE -fPIC -pthread $(DEBUG_FLAGS) 37 | 38 | lib_LTLIBRARIES = libunyte-reuseport-loadbalancer.la 39 | 40 | libunyte_reuseport_loadbalancer_la_SOURCES = \ 41 | unyte_reuseport_user.c \ 42 | unyte_reuseport_user.h \ 43 | $(NULL) 44 | 45 | libunyte_reuseport_loadbalancer_la_CFLAGS = -Wextra -Wall -ansi -g -std=c11 -D_GNU_SOURCE -fPIC $(DEBUG_FLAGS) 46 | -------------------------------------------------------------------------------- /src/main.c: -------------------------------------------------------------------------------- 1 | /** 2 | * Example of client using a eBPF loadbalancer. 3 | * This allows multiple client instances listening on the same IP/port and receiving consistent data 4 | * (all packets from one src IP will always go on the same collector) 5 | * 6 | * Usage: ./main 7 | * 8 | * Example: launching 3 instances on the same ip port. The index is the index on the map to put the socket 9 | * and the balancer_max is how many max instances are in use. 10 | * 11 | * ./main 192.168.1.17 10001 0 3 12 | * ./main 192.168.1.17 10001 1 3 13 | * ./main 192.168.1.17 10001 2 3 14 | */ 15 | 16 | #include 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include "./unyte_reuseport_user.h" 23 | 24 | // if installed in machine 25 | // #include 26 | 27 | #define SK_BUFFER 20971520 // 20MB of socket buffer size 28 | #define UDP_MAX_SIZE 65535 29 | 30 | int main(int argc, char *argv[]) 31 | { 32 | if (argc != 5) 33 | { 34 | printf("Error: arguments not valid\n"); 35 | printf("Usage: ./main \n"); 36 | printf("Example: ./main 10.0.2.15 10001 0 5\n"); 37 | exit(1); 38 | } 39 | 40 | printf("Listening on %s:%s\n", argv[1], argv[2]); 41 | 42 | // Create a udp socket with default socket buffer 43 | int socketfd = unyte_create_udp_bound_socket(argv[1], argv[2], SK_BUFFER); 44 | 45 | // Attaching eBPF load balancer to socket 46 | int ret_attach = unyte_attach_ebpf_to_socket(socketfd, atoi(argv[3]), atoi(argv[4]), "unyte_reuseport", "unyte_reuseport_kern.o"); 47 | 48 | if (ret_attach != 0) 49 | exit(1); 50 | 51 | struct sockaddr_storage peer_addr; 52 | socklen_t peer_addr_len = sizeof(struct sockaddr_storage); 53 | ssize_t nread; 54 | char buf[UDP_MAX_SIZE]; 55 | 56 | while (1) 57 | { 58 | nread = recvfrom(socketfd, buf, UDP_MAX_SIZE, 0, 59 | (struct sockaddr *)&peer_addr, &peer_addr_len); 60 | 61 | if (nread == -1) 62 | continue; // Ignore failed request 63 | 64 | char ip_src_canonical[100]; 65 | printf("****** Message ******\n"); 66 | if (peer_addr.ss_family == AF_INET) 67 | { 68 | printf("Received %ld bytes from %s:%u\n", (long)nread, 69 | inet_ntop(peer_addr.ss_family, &((struct sockaddr_in *)&peer_addr)->sin_addr.s_addr, ip_src_canonical, sizeof ip_src_canonical), 70 | ntohs(((struct sockaddr_in *)&peer_addr)->sin_port)); 71 | } 72 | else 73 | { 74 | printf("Received %ld bytes from %s:%u\n", (long)nread, 75 | inet_ntop(peer_addr.ss_family, &((struct sockaddr_in *)&peer_addr)->sin_addr.s_addr, ip_src_canonical, sizeof ip_src_canonical), 76 | ntohs(((struct sockaddr_in6 *)&peer_addr)->sin6_port)); 77 | } 78 | printf("Buffer: %.*s\n", (int)nread, buf); 79 | printf("**** End Message ****\n\n"); 80 | } 81 | 82 | return 0; 83 | } 84 | -------------------------------------------------------------------------------- /src/udp_publisher.c: -------------------------------------------------------------------------------- 1 | /** 2 | * Publisher of udp packets to test main.c 3 | * This code allows sending "Hello World !" messages to a connected IP/port. 4 | * 5 | * Usage: ./udp_publisher 6 | * 7 | * Example for sending 10 message: ./udp_publisher 10.0.2.15 10001 10 8 | * Example for sending infinite messages: ./udp_publisher 10.0.2.15 10001 0 9 | */ 10 | 11 | #include 12 | #include 13 | #include 14 | #include 15 | #include 16 | #include 17 | #include 18 | #include 19 | 20 | #define SEND_SK_BUFFER 20971520 // 20MB of socket buffer size 21 | #define UDP_MAX_SIZE 65535 22 | 23 | int create_udp_socket(char *address, char *port, uint64_t buffer_size) 24 | { 25 | struct addrinfo *addr_info; 26 | struct addrinfo hints; 27 | 28 | memset(&hints, 0, sizeof(hints)); 29 | 30 | hints.ai_socktype = SOCK_DGRAM; 31 | hints.ai_family = AF_UNSPEC; 32 | hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV; 33 | 34 | int rc = getaddrinfo(address, port, &hints, &addr_info); 35 | 36 | if (rc != 0) 37 | { 38 | printf("getaddrinfo error: %s\n", gai_strerror(rc)); 39 | exit(EXIT_FAILURE); 40 | } 41 | 42 | int sockfd = socket(addr_info->ai_family, addr_info->ai_socktype, addr_info->ai_protocol); 43 | 44 | if (sockfd < 0) 45 | { 46 | perror("socket()"); 47 | exit(EXIT_FAILURE); 48 | } 49 | 50 | if (setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &buffer_size, sizeof(buffer_size))) 51 | { 52 | perror("Set socket buffer size"); 53 | exit(EXIT_FAILURE); 54 | } 55 | 56 | // connect socket to destination address 57 | if (connect(sockfd, addr_info->ai_addr, (int)addr_info->ai_addrlen) == -1) 58 | { 59 | perror("Connect failed"); 60 | close(sockfd); 61 | exit(EXIT_FAILURE); 62 | } 63 | 64 | // free addr_info after usage 65 | freeaddrinfo(addr_info); 66 | 67 | return sockfd; 68 | } 69 | 70 | int main(int argc, char *argv[]) 71 | { 72 | if (argc != 4) 73 | { 74 | printf("Error: arguments not valid\n"); 75 | printf("Usage: ./udp_publisher \n"); 76 | printf("Example: ./udp_publisher 10.0.2.15 10001 10\n"); 77 | exit(1); 78 | } 79 | 80 | printf("Sending on %s:%s\n", argv[1], argv[2]); 81 | 82 | int socket_fd = create_udp_socket(argv[1], argv[2], SEND_SK_BUFFER); 83 | 84 | int messages_to_send = atoi(argv[3]); 85 | bool infinite = false; 86 | if (messages_to_send == 0) 87 | infinite = true; 88 | 89 | char buf[100]; 90 | int buf_len = strlen(buf); 91 | int count = 0; 92 | while (1) 93 | { 94 | if (!infinite) 95 | { 96 | messages_to_send--; 97 | if (messages_to_send < 0) 98 | break; 99 | } 100 | 101 | sprintf(buf, "Hello World %d!", count); 102 | buf_len = strlen(buf); 103 | count++; 104 | 105 | if (send(socket_fd, buf, buf_len, 0) < 0) 106 | fprintf(stderr, "Error sending response\n"); 107 | sleep(1); 108 | } 109 | return 0; 110 | } 111 | -------------------------------------------------------------------------------- /src/unyte_reuseport_kern.c: -------------------------------------------------------------------------------- 1 | // clang-format off 2 | #include "vmlinux.h" 3 | // clang-format on 4 | #include 5 | #include 6 | 7 | // https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/if_ether.h#L52 8 | #define ETH_P_IP 0x0800 9 | 10 | #ifndef MAX_BALANCER_COUNT 11 | // Keep in sync with _user.c 12 | #define MAX_BALANCER_COUNT 128 13 | #endif 14 | 15 | // bpf_printk argument limits 16 | #define _STRINGIFY(x) #x 17 | #define STRINGIFY(x) _STRINGIFY(x) 18 | #define LOC __FILE__ ":" STRINGIFY(__LINE__) ": " 19 | 20 | const u32 zero = 0; // array access index 21 | const u32 balancer_max = MAX_BALANCER_COUNT; 22 | 23 | // MAPS 24 | 25 | struct { 26 | __uint(type, BPF_MAP_TYPE_ARRAY); 27 | __type(key, u32); 28 | __type(value, u32); 29 | __uint(max_entries, 1); 30 | __uint(pinning, LIBBPF_PIN_BY_NAME); 31 | } nonce SEC(".maps"); 32 | 33 | struct { 34 | __uint(type, BPF_MAP_TYPE_ARRAY); 35 | __type(key, u32); 36 | __type(value, u32); 37 | __uint(max_entries, 1); 38 | __uint(pinning, LIBBPF_PIN_BY_NAME); 39 | } size SEC(".maps"); 40 | 41 | struct { 42 | __uint(type, BPF_MAP_TYPE_REUSEPORT_SOCKARRAY); 43 | __type(key, u32); 44 | __type(value, u64); 45 | __uint(max_entries, MAX_BALANCER_COUNT); 46 | __uint(pinning, LIBBPF_PIN_BY_NAME); 47 | } tcp_balancing_targets SEC(".maps"); 48 | 49 | struct { 50 | __uint(type, BPF_MAP_TYPE_REUSEPORT_SOCKARRAY); 51 | __type(key, u32); 52 | __type(value, u64); 53 | __uint(max_entries, MAX_BALANCER_COUNT); 54 | __uint(pinning, LIBBPF_PIN_BY_NAME); 55 | } udp_balancing_targets SEC(".maps"); 56 | 57 | // HASHING 58 | 59 | #define __jhash_final(a, b, c) \ 60 | { \ 61 | c ^= b; \ 62 | c -= rol32(b, 14); \ 63 | a ^= c; \ 64 | a -= rol32(c, 11); \ 65 | b ^= a; \ 66 | b -= rol32(a, 25); \ 67 | c ^= b; \ 68 | c -= rol32(b, 16); \ 69 | a ^= c; \ 70 | a -= rol32(c, 4); \ 71 | b ^= a; \ 72 | b -= rol32(a, 14); \ 73 | c ^= b; \ 74 | c -= rol32(b, 24); \ 75 | } 76 | #define JHASH_INITVAL 0xdeadbeef 77 | 78 | static inline __u32 rol32(__u32 word, unsigned int shift) { return (word << (shift & 31)) | (word >> ((-shift) & 31)); } 79 | 80 | static inline u32 hash(u32 ip_p1, u32 ip_p2, u32 ip_p3, u32 ip_p4) { 81 | u32 a, b, c, initval, *n; 82 | 83 | // Initialize nonce if not done already 84 | n = bpf_map_lookup_elem(&nonce, &zero); 85 | if (n == 0) { 86 | // Cannot happen as BPF_MAP_TYPE_ARRAY always resolves 87 | return SK_DROP; 88 | } 89 | 90 | if (*n == 0) { 91 | // TODO: Handle bpf_get_prandom_u32() == 0 92 | *n = bpf_get_prandom_u32(); 93 | 94 | #ifdef _LOG_DEBUG 95 | bpf_printk(LOC "Updating nonce to %x\n", *n); 96 | #endif 97 | } 98 | 99 | initval = *n; 100 | 101 | initval += JHASH_INITVAL + (3 << 2); 102 | a = ip_p1 + ip_p2 + ip_p3 + ip_p4 + initval; 103 | b = initval; 104 | c = initval; 105 | 106 | __jhash_final(a, b, c); 107 | return c; 108 | } 109 | 110 | // CORE LOGIC 111 | // sk_reuseport_md: https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/bpf.h#L5655 112 | // https://git.yoctoproject.org/linux-yocto-contrib/plain/tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c 113 | 114 | SEC("sk_reuseport/selector") 115 | enum sk_action _selector(struct sk_reuseport_md *reuse) { 116 | enum sk_action action; 117 | struct iphdr ip; 118 | struct ipv6hdr ipv6; 119 | 120 | u32 key; 121 | // https://en.wikipedia.org/wiki/EtherType 122 | int is_ipv4 = reuse->eth_protocol == bpf_htons(ETH_P_IP); 123 | void *targets; 124 | 125 | // initialization -- resolve invalid indirect read from the stack (https://stackoverflow.com/questions/71529801/ebpf-bpf-map-update-returns-the-invalid-indirect-read-from-stack-error) 126 | __builtin_memset(&ipv6, 0, sizeof(struct ipv6hdr)); 127 | __builtin_memset(&ip, 0, sizeof(struct iphdr)); 128 | 129 | switch (reuse->ip_protocol) { 130 | case IPPROTO_TCP: 131 | targets = &tcp_balancing_targets; 132 | break; 133 | case IPPROTO_UDP: 134 | targets = &udp_balancing_targets; 135 | break; 136 | default: 137 | #ifdef _LOG_DEBUG 138 | bpf_printk(LOC "Unsupported IPPROTO=%d\n", reuse->ip_protocol); 139 | #endif 140 | return SK_DROP; 141 | } 142 | 143 | if(is_ipv4){ 144 | bpf_skb_load_bytes_relative(reuse, 0, &ip, sizeof(struct iphdr), (u32)BPF_HDR_START_NET); 145 | } else { 146 | bpf_skb_load_bytes_relative(reuse, 0, &ipv6, sizeof(struct ipv6hdr), (u32)BPF_HDR_START_NET); 147 | } 148 | 149 | const u32 *balancer_count = bpf_map_lookup_elem(&size, &zero); 150 | if (!balancer_count || *balancer_count == 0) { // uninitialized by userspace 151 | balancer_count = &balancer_max; 152 | bpf_map_update_elem(&size, &zero, balancer_count, BPF_ANY); 153 | } 154 | 155 | #ifdef _LOG_DEBUG 156 | bpf_printk(LOC "Balancing across %d hash buckets\n", *balancer_count); 157 | #endif 158 | 159 | // hash on the IP only 160 | if(is_ipv4){ 161 | key = hash(__builtin_bswap32(ip.saddr),0,0,0) % *balancer_count; 162 | } else { 163 | key = hash( 164 | __builtin_bswap32(ipv6.saddr.in6_u.u6_addr32[0]), 165 | __builtin_bswap32(ipv6.saddr.in6_u.u6_addr32[1]), 166 | __builtin_bswap32(ipv6.saddr.in6_u.u6_addr32[2]), 167 | __builtin_bswap32(ipv6.saddr.in6_u.u6_addr32[3]) 168 | ) % *balancer_count; 169 | } 170 | 171 | #ifdef _LOG_DEBUG 172 | if(is_ipv4){ 173 | bpf_printk(LOC "src4: %x, dest4: %x, key: %d\n", __builtin_bswap32(ip.saddr), __builtin_bswap32(ip.daddr), key); 174 | }else{ 175 | bpf_printk(LOC "[Last 32b] src6: %x, dest6: %x, key: %d\n", __builtin_bswap32(ipv6.saddr.in6_u.u6_addr32[3]), __builtin_bswap32(ipv6.daddr.in6_u.u6_addr32[3]), key); 176 | } 177 | #endif 178 | 179 | // side-effect sets dst socket if found 180 | if (bpf_sk_select_reuseport(reuse, targets, &key, 0) == 0) { 181 | action = SK_PASS; 182 | #ifdef _LOG_DEBUG 183 | bpf_printk(LOC "=> action: pass\n\n"); 184 | #endif 185 | } else { 186 | action = SK_DROP; 187 | #ifdef _LOG_DEBUG 188 | bpf_printk(LOC "=> action: drop\n\n"); 189 | #endif 190 | } 191 | 192 | return action; 193 | } 194 | 195 | char _license[] SEC("license") = "GPL"; 196 | -------------------------------------------------------------------------------- /src/unyte_reuseport_user.c: -------------------------------------------------------------------------------- 1 | 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | 14 | #define USED_VLEN 1 15 | #define MAX_TO_RECEIVE 20 16 | 17 | #ifndef MAX_BALANCER_COUNT 18 | // Keep in sync with _kern.c 19 | #define MAX_BALANCER_COUNT 128 20 | #endif 21 | 22 | int unyte_create_udp_bound_socket(char *address, char *port, uint64_t buffer_size) 23 | { 24 | assert(address != NULL); 25 | assert(port != NULL); 26 | assert(buffer_size > 0); 27 | 28 | struct addrinfo *addr_info; 29 | struct addrinfo hints; 30 | 31 | memset(&hints, 0, sizeof(hints)); 32 | 33 | hints.ai_socktype = SOCK_DGRAM; 34 | hints.ai_family = AF_UNSPEC; 35 | hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV; 36 | 37 | // Using getaddrinfo to support both IPv4 and IPv6 38 | int rc = getaddrinfo(address, port, &hints, &addr_info); 39 | 40 | if (rc != 0) 41 | { 42 | printf("getaddrinfo error: %s\n", gai_strerror(rc)); 43 | exit(EXIT_FAILURE); 44 | } 45 | 46 | printf("Address type: %s | %d\n", (addr_info->ai_family == AF_INET) ? "IPv4" : "IPv6", ntohs(((struct sockaddr_in *)addr_info->ai_addr)->sin_port)); 47 | 48 | // create socket on UDP protocol 49 | int sockfd = socket(addr_info->ai_family, addr_info->ai_socktype, addr_info->ai_protocol); 50 | 51 | // handle error 52 | if (sockfd < 0) 53 | { 54 | perror("Cannot create socket"); 55 | exit(EXIT_FAILURE); 56 | } 57 | 58 | // Use SO_REUSEPORT to be able to launch multiple collector on the same address 59 | int optval = 1; 60 | if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, &optval, sizeof(int)) < 0) 61 | { 62 | perror("Cannot set SO_REUSEPORT option on socket"); 63 | exit(EXIT_FAILURE); 64 | } 65 | 66 | uint64_t receive_buf_size = buffer_size; 67 | if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, &receive_buf_size, sizeof(receive_buf_size)) < 0) 68 | { 69 | perror("Cannot set buffer size"); 70 | exit(EXIT_FAILURE); 71 | } 72 | 73 | if (bind(sockfd, addr_info->ai_addr, (int)addr_info->ai_addrlen) == -1) 74 | { 75 | perror("Bind failed"); 76 | close(sockfd); 77 | exit(EXIT_FAILURE); 78 | } 79 | 80 | // free addr_info after usage 81 | freeaddrinfo(addr_info); 82 | 83 | return sockfd; 84 | } 85 | 86 | #ifdef _LOG_DEBUG 87 | static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args) { 88 | return level <= LIBBPF_DEBUG ? vfprintf(stderr, format, args) : 0; 89 | } 90 | #endif 91 | 92 | int unyte_attach_ebpf_to_socket(int socketfd, uint32_t key, uint32_t balancer_count, const char pin_root_path[], const char bpf_kernel_prg_filename[]) 93 | { 94 | int umap_fd, size_map_fd, prog_fd; 95 | int64_t usock = socketfd; 96 | long err = 0; 97 | 98 | assert(!balancer_count || key < balancer_count); 99 | assert(balancer_count <= MAX_BALANCER_COUNT); 100 | assert(usock >= 0); 101 | 102 | printf("from args: Using hash bucket index %u", key); 103 | if (balancer_count > 0) printf(" (%u buckets in total)", balancer_count); 104 | puts(""); 105 | 106 | #ifdef _LOG_DEBUG 107 | // set log 108 | libbpf_set_print(libbpf_print_fn); 109 | #endif 110 | 111 | char pin_path[100]; 112 | sprintf(pin_path, "/sys/fs/bpf/%s", pin_root_path); 113 | 114 | // Open reuseport_udp_kern.o 115 | struct bpf_object_open_opts opts = {.sz = sizeof(struct bpf_object_open_opts), 116 | .pin_root_path = pin_path}; 117 | struct bpf_object *obj = bpf_object__open_file(bpf_kernel_prg_filename, &opts); 118 | 119 | err = libbpf_get_error(obj); 120 | if (err) { 121 | perror("Failed to open BPF elf file"); 122 | return 1; 123 | } 124 | 125 | struct bpf_map *udpmap = bpf_object__find_map_by_name(obj, "udp_balancing_targets"); 126 | assert(udpmap); 127 | 128 | // Load reuseport_udp_kern.o to the kernel 129 | if (bpf_object__load(obj) != 0) { 130 | perror("Error loading BPF object into kernel"); 131 | return 1; 132 | } 133 | 134 | struct bpf_program *prog = bpf_object__find_program_by_name(obj, "_selector"); 135 | if (!prog) { 136 | perror("Could not find BPF program in BPF object"); 137 | return 1; 138 | } 139 | 140 | prog_fd = bpf_program__fd(prog); 141 | assert(prog_fd); 142 | 143 | umap_fd = bpf_map__fd(udpmap); 144 | assert(umap_fd); 145 | 146 | if (setsockopt(usock, SOL_SOCKET, SO_ATTACH_REUSEPORT_EBPF, &prog_fd, sizeof(prog_fd)) != 0) { 147 | perror("Could not attach BPF prog"); 148 | return 1; 149 | } 150 | 151 | printf("UDP sockfd: %ld\n", usock); 152 | if (bpf_map_update_elem(umap_fd, &key, &usock, BPF_ANY) != 0) { 153 | perror("Could not update reuseport array"); 154 | return 1; 155 | } 156 | 157 | // Determine intended number of hash buckets 158 | // Assumption: static during lifetime of this process 159 | struct bpf_map *size_map = bpf_object__find_map_by_name(obj, "size"); 160 | assert(size_map); 161 | size_map_fd = bpf_map__fd(size_map); 162 | assert(size_map_fd); 163 | 164 | uint32_t index = 0; 165 | if (balancer_count == 0) { // no user-supplied limit 166 | bpf_map_lookup_elem(size_map_fd, &index, &balancer_count); 167 | if (balancer_count == 0) { // BPF program hasn't run yet to initalize this 168 | balancer_count = MAX_BALANCER_COUNT; 169 | if (bpf_map_update_elem(size_map_fd, &index, &balancer_count, BPF_ANY) != 0) { 170 | perror("Could not update balancer count"); 171 | return 1; 172 | } 173 | } 174 | } else { // Overwrite global count with user supplied one 175 | if (bpf_map_update_elem(size_map_fd, &index, &balancer_count, BPF_ANY) != 0) { 176 | perror("Could not update balancer count"); 177 | return 1; 178 | } 179 | } 180 | 181 | return 0; 182 | } 183 | -------------------------------------------------------------------------------- /src/unyte_reuseport_user.h: -------------------------------------------------------------------------------- 1 | #ifndef UNYTE_REUSEPORT_USER_H 2 | #define UNYTE_REUSEPORT_USER_H 3 | 4 | #include 5 | 6 | /** 7 | * Creates a datagram socket with SO_REUSEPORT activated and already bound to addres/port 8 | */ 9 | int unyte_create_udp_bound_socket(char *address, char *port, uint64_t buffer_size); 10 | 11 | /** 12 | * Open socket, loads eBPF program and attaches it to the opened socket. 13 | * int socketfd : socket file descriptor to listen to. 14 | * uint32_t key : index of the socket to be filled in the eBPF hash table. 15 | * uint32_t balancer_count : max values to be used in eBPF reuse. Should be <= MAX_BALANCER_COUNT. 16 | * const char pin_root_path[] : pin root path of eBPFFS (/sys/fs/bpf/) 17 | * const char bpf_kernel_prg_filename[] : BPF kernel .o program 18 | */ 19 | int unyte_attach_ebpf_to_socket(int socketfd, uint32_t key, uint32_t balancer_count, const char pin_root_path[], const char bpf_kernel_prg[]); 20 | 21 | #endif 22 | -------------------------------------------------------------------------------- /unyte-reuseport-loadbalancer.pc.in: -------------------------------------------------------------------------------- 1 | prefix=@prefix@ 2 | exec_prefix=@exec_prefix@ 3 | includedir=@includedir@ 4 | libdir=@libdir@ 5 | 6 | Name: unyte-reuseport-loadbalancer 7 | Description: Unyte eBPF reuseport loadbalancer library 8 | Version: @VERSION@ 9 | Cflags: -I${includedir}/unyte-reuseport-loadbalancer 10 | Libs: -L${libdir} -lunyte-reuseport-loadbalancer 11 | --------------------------------------------------------------------------------