├── .gitignore ├── LICENSE ├── README.md ├── go.mod ├── internal └── netlink │ └── netlink.go └── ipset_linux.go /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, built with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | # Dependency directories (remove the comment below to include it) 15 | # vendor/ 16 | 17 | /bak/ 18 | example 19 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ipset 2 | 3 | [![Go Report Card](https://goreportcard.com/badge/github.com/nadoo/ipset?style=flat-square)](https://goreportcard.com/report/github.com/nadoo/ipset) 4 | [![GitHub tag](https://img.shields.io/github/v/tag/nadoo/ipset.svg?sort=semver&style=flat-square)](https://github.com/nadoo/ipset/releases) 5 | [![PkgGoDev](https://pkg.go.dev/badge/github.com/nadoo/ipset)](https://pkg.go.dev/github.com/nadoo/ipset) 6 | [![Go Version](https://img.shields.io/github/go-mod/go-version/nadoo/ipset?style=flat-square)](https://go.dev/dl/) 7 | 8 | netlink ipset package for Go. 9 | 10 | ## Usage 11 | 12 | ### Your code: 13 | ```Go 14 | package main 15 | 16 | import ( 17 | "log" 18 | 19 | "github.com/nadoo/ipset" 20 | ) 21 | 22 | func main() { 23 | // must call Init first 24 | if err := ipset.Init(); err != nil { 25 | log.Printf("error in ipset Init: %s", err) 26 | return 27 | } 28 | 29 | // default is ipv4 without timeout 30 | ipset.Destroy("myset") 31 | ipset.Create("myset") 32 | ipset.Add("myset", "1.1.1.1") 33 | ipset.Add("myset", "2.2.2.0/24") 34 | 35 | // ipv6 and timeout example 36 | // ipset create myset6 hash:net family inet6 timeout 60 37 | ipset.Create("myset6", ipset.OptIPv6(), ipset.OptTimeout(60)) 38 | ipset.Flush("myset6") 39 | 40 | ipset.Add("myset6", "2022::1", ipset.OptTimeout(10)) 41 | ipset.Add("myset6", "2022::1/32") 42 | } 43 | ``` 44 | 45 | ### Result: 46 | `ipset list myset` 47 | 48 | ``` 49 | Name: myset 50 | Type: hash:net 51 | Revision: 1 52 | Header: family inet hashsize 1024 maxelem 65536 53 | Size in memory: 552 54 | References: 0 55 | Number of entries: 2 56 | Members: 57 | 1.1.1.1 58 | 2.2.2.0/24 59 | ``` 60 | 61 | `ipset list myset6` 62 | 63 | ``` 64 | Name: myset6 65 | Type: hash:net 66 | Revision: 1 67 | Header: family inet6 hashsize 1024 maxelem 65536 timeout 60 68 | Size in memory: 1432 69 | References: 0 70 | Number of entries: 2 71 | Members: 72 | 2022::1 timeout 9 73 | 2022::/32 timeout 59 74 | ``` 75 | 76 | ## Links 77 | 78 | - [glider](https://github.com/nadoo/glider): a forward proxy with ipset management features powered by this package. 79 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/nadoo/ipset 2 | 3 | go 1.18 4 | -------------------------------------------------------------------------------- /internal/netlink/netlink.go: -------------------------------------------------------------------------------- 1 | package netlink 2 | 3 | import ( 4 | "encoding/binary" 5 | "errors" 6 | "net/netip" 7 | "sync/atomic" 8 | "syscall" 9 | "unsafe" 10 | ) 11 | 12 | // NFNL_SUBSYS_IPSET is netfilter netlink message type of ipset. 13 | // https://github.com/torvalds/linux/blob/9e66317d3c92ddaab330c125dfe9d06eee268aff/include/uapi/linux/netfilter/nfnetlink.h#L56 14 | const NFNL_SUBSYS_IPSET = 6 15 | 16 | // IPSET_PROTOCOL is the protocol version. 17 | // http://git.netfilter.org/ipset/tree/include/libipset/linux_ip_set.h 18 | const IPSET_PROTOCOL = 6 19 | 20 | // IPSET_MAXNAMELEN is the max length of strings including NUL: set and type identifiers. 21 | const IPSET_MAXNAMELEN = 32 22 | 23 | // Message types and commands. 24 | const ( 25 | IPSET_CMD_CREATE = 2 26 | IPSET_CMD_DESTROY = 3 27 | IPSET_CMD_FLUSH = 4 28 | IPSET_CMD_ADD = 9 29 | IPSET_CMD_DEL = 10 30 | ) 31 | 32 | // Attributes at command level. 33 | const ( 34 | IPSET_ATTR_PROTOCOL = 1 /* 1: Protocol version */ 35 | IPSET_ATTR_SETNAME = 2 /* 2: Name of the set */ 36 | IPSET_ATTR_TYPENAME = 3 /* 3: Typename */ 37 | IPSET_ATTR_REVISION = 4 /* 4: Settype revision */ 38 | IPSET_ATTR_FAMILY = 5 /* 5: Settype family */ 39 | IPSET_ATTR_DATA = 7 /* 7: Nested attributes */ 40 | ) 41 | 42 | // CADT specific attributes. 43 | const ( 44 | IPSET_ATTR_IP = 1 45 | IPSET_ATTR_CIDR = 3 46 | IPSET_ATTR_TIMEOUT = 6 47 | ) 48 | 49 | // IP specific attributes. 50 | const ( 51 | IPSET_ATTR_IPADDR_IPV4 = 1 52 | IPSET_ATTR_IPADDR_IPV6 = 2 53 | ) 54 | 55 | // ATTR flags. 56 | const ( 57 | NLA_F_NESTED = (1 << 15) 58 | NLA_F_NET_BYTEORDER = (1 << 14) 59 | ) 60 | 61 | var nextSeqNr uint32 62 | var nativeEndian binary.ByteOrder 63 | 64 | // NetLink struct. 65 | type NetLink struct { 66 | fd int 67 | lsa syscall.SockaddrNetlink 68 | } 69 | 70 | // Options for netlink. 71 | type Options struct { 72 | IPv6 bool 73 | Timeout uint32 74 | Excl bool 75 | } 76 | 77 | // Option func parameter 78 | type Option func(opts *Options) 79 | 80 | // New returns a new netlink socket. 81 | func New() (*NetLink, error) { 82 | fd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_RAW, syscall.NETLINK_NETFILTER) 83 | if err != nil { 84 | return nil, err 85 | } 86 | // defer syscall.Close(fd) 87 | 88 | nl := &NetLink{fd: fd} 89 | nl.lsa.Family = syscall.AF_NETLINK 90 | 91 | err = syscall.Bind(fd, &nl.lsa) 92 | if err != nil { 93 | syscall.Close(fd) 94 | return nil, err 95 | } 96 | 97 | return nl, nil 98 | } 99 | 100 | // CreateSet create a ipset. 101 | func (nl *NetLink) CreateSet(setName string, opts ...Option) error { 102 | if setName == "" { 103 | return errors.New("ipset: setName must be specified") 104 | } 105 | 106 | if len(setName) > IPSET_MAXNAMELEN { 107 | return errors.New("ipset: name too long") 108 | } 109 | 110 | option := Options{} 111 | for _, opt := range opts { 112 | opt(&option) 113 | } 114 | 115 | var family uint8 = syscall.AF_INET 116 | if option.IPv6 { 117 | family = syscall.AF_INET6 118 | } 119 | 120 | req := NewNetlinkRequest(IPSET_CMD_CREATE|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST) 121 | req.AddData(NewNfGenMsg(syscall.AF_INET, 0, 0)) 122 | req.AddData(NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))) 123 | req.AddData(NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))) 124 | req.AddData(NewRtAttr(IPSET_ATTR_TYPENAME, ZeroTerminated("hash:net"))) 125 | req.AddData(NewRtAttr(IPSET_ATTR_REVISION, Uint8Attr(1))) 126 | req.AddData(NewRtAttr(IPSET_ATTR_FAMILY, Uint8Attr(family))) 127 | 128 | attrData := NewRtAttr(IPSET_ATTR_DATA|NLA_F_NESTED, nil) 129 | if option.Timeout != 0 { 130 | attrData.AddChild(&Uint32Attribute{Type: IPSET_ATTR_TIMEOUT | NLA_F_NET_BYTEORDER, Value: option.Timeout}) 131 | } 132 | req.AddData(attrData) 133 | 134 | return syscall.Sendto(nl.fd, req.Serialize(), 0, &nl.lsa) 135 | } 136 | 137 | // DestroySet destroys a ipset. 138 | func (nl *NetLink) DestroySet(setName string) error { 139 | if setName == "" { 140 | return errors.New("setName must be specified") 141 | } 142 | 143 | req := NewNetlinkRequest(IPSET_CMD_DESTROY|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST) 144 | req.AddData(NewNfGenMsg(syscall.AF_INET, 0, 0)) 145 | req.AddData(NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))) 146 | req.AddData(NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))) 147 | 148 | return syscall.Sendto(nl.fd, req.Serialize(), 0, &nl.lsa) 149 | } 150 | 151 | // FlushSet flush a ipset. 152 | func (nl *NetLink) FlushSet(setName string) error { 153 | if setName == "" { 154 | return errors.New("setName must be specified") 155 | } 156 | 157 | req := NewNetlinkRequest(IPSET_CMD_FLUSH|(NFNL_SUBSYS_IPSET<<8), syscall.NLM_F_REQUEST) 158 | req.AddData(NewNfGenMsg(syscall.AF_INET, 0, 0)) 159 | req.AddData(NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))) 160 | req.AddData(NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))) 161 | 162 | return syscall.Sendto(nl.fd, req.Serialize(), 0, &nl.lsa) 163 | } 164 | 165 | // HandleAddr adds netip.Addr/netip.Prefix to set. 166 | func (nl *NetLink) HandleAddr(cmd int, setName string, ip netip.Addr, cidr netip.Prefix, opts ...Option) error { 167 | if setName == "" { 168 | return errors.New("setName must be specified") 169 | } 170 | 171 | if len(setName) > IPSET_MAXNAMELEN { 172 | return errors.New("setName too long") 173 | } 174 | 175 | option := Options{} 176 | for _, opt := range opts { 177 | opt(&option) 178 | } 179 | 180 | flags := syscall.NLM_F_REQUEST 181 | if option.Excl { 182 | flags |= syscall.NLM_F_EXCL 183 | } 184 | 185 | req := NewNetlinkRequest(cmd|(NFNL_SUBSYS_IPSET<<8), flags) 186 | req.AddData(NewNfGenMsg(syscall.AF_INET, 0, 0)) 187 | req.AddData(NewRtAttr(IPSET_ATTR_PROTOCOL, Uint8Attr(IPSET_PROTOCOL))) 188 | req.AddData(NewRtAttr(IPSET_ATTR_SETNAME, ZeroTerminated(setName))) 189 | 190 | attrData := NewRtAttr(IPSET_ATTR_DATA|NLA_F_NESTED, nil) 191 | 192 | if option.Timeout >= 0 { 193 | attrData.AddChild(&Uint32Attribute{Type: IPSET_ATTR_TIMEOUT | NLA_F_NET_BYTEORDER, Value: option.Timeout}) 194 | } 195 | 196 | attrIP := NewRtAttrChild(attrData, IPSET_ATTR_IP|NLA_F_NESTED, nil) 197 | 198 | if ip.Is4() { 199 | NewRtAttrChild(attrIP, IPSET_ATTR_IPADDR_IPV4|NLA_F_NET_BYTEORDER, ip.AsSlice()) 200 | } else { 201 | NewRtAttrChild(attrIP, IPSET_ATTR_IPADDR_IPV6|NLA_F_NET_BYTEORDER, ip.AsSlice()) 202 | } 203 | 204 | // for cidr prefix 205 | if cidr.IsValid() { 206 | NewRtAttrChild(attrData, IPSET_ATTR_CIDR, Uint8Attr(uint8(cidr.Bits()))) 207 | } 208 | 209 | NewRtAttrChild(attrData, 9|NLA_F_NET_BYTEORDER, Uint32Attr(0)) 210 | req.AddData(attrData) 211 | 212 | return syscall.Sendto(nl.fd, req.Serialize(), 0, &nl.lsa) 213 | } 214 | 215 | // NativeEndian get native endianness for the system 216 | func NativeEndian() binary.ByteOrder { 217 | if nativeEndian == nil { 218 | var x uint32 = 0x01020304 219 | if *(*byte)(unsafe.Pointer(&x)) == 0x01 { 220 | nativeEndian = binary.BigEndian 221 | } else { 222 | nativeEndian = binary.LittleEndian 223 | } 224 | } 225 | return nativeEndian 226 | } 227 | 228 | func rtaAlignOf(attrlen int) int { 229 | return (attrlen + syscall.RTA_ALIGNTO - 1) & ^(syscall.RTA_ALIGNTO - 1) 230 | } 231 | 232 | // NetlinkRequestData interface. 233 | type NetlinkRequestData interface { 234 | Len() int 235 | Serialize() []byte 236 | } 237 | 238 | // NfGenMsg struct. 239 | type NfGenMsg struct { 240 | nfgenFamily uint8 241 | version uint8 242 | resID uint16 243 | } 244 | 245 | // NewNfGenMsg returns a new NfGenMsg. 246 | func NewNfGenMsg(nfgenFamily, version, resID int) *NfGenMsg { 247 | return &NfGenMsg{ 248 | nfgenFamily: uint8(nfgenFamily), 249 | version: uint8(version), 250 | resID: uint16(resID), 251 | } 252 | } 253 | 254 | // Len returns the length. 255 | func (m *NfGenMsg) Len() int { 256 | return rtaAlignOf(4) 257 | } 258 | 259 | // Serialize serializes NfGenMsg to bytes. 260 | func (m *NfGenMsg) Serialize() []byte { 261 | native := NativeEndian() 262 | 263 | length := m.Len() 264 | buf := make([]byte, rtaAlignOf(length)) 265 | buf[0] = m.nfgenFamily 266 | buf[1] = m.version 267 | native.PutUint16(buf[2:4], m.resID) 268 | return buf 269 | } 270 | 271 | // RtAttr Extend RtAttr to handle data and children. 272 | type RtAttr struct { 273 | syscall.RtAttr 274 | Data []byte 275 | children []NetlinkRequestData 276 | } 277 | 278 | // NewRtAttr Create a new Extended RtAttr object. 279 | func NewRtAttr(attrType int, data []byte) *RtAttr { 280 | return &RtAttr{ 281 | RtAttr: syscall.RtAttr{ 282 | Type: uint16(attrType), 283 | }, 284 | children: []NetlinkRequestData{}, 285 | Data: data, 286 | } 287 | } 288 | 289 | // NewRtAttrChild Create a new RtAttr obj anc add it as a child of an existing object. 290 | func NewRtAttrChild(parent *RtAttr, attrType int, data []byte) *RtAttr { 291 | attr := NewRtAttr(attrType, data) 292 | parent.children = append(parent.children, attr) 293 | return attr 294 | } 295 | 296 | // AddChild adds an existing NetlinkRequestData as a child. 297 | func (a *RtAttr) AddChild(attr NetlinkRequestData) { 298 | a.children = append(a.children, attr) 299 | } 300 | 301 | // Len returns the length of RtAttr. 302 | func (a *RtAttr) Len() int { 303 | if len(a.children) == 0 { 304 | return (syscall.SizeofRtAttr + len(a.Data)) 305 | } 306 | 307 | l := 0 308 | for _, child := range a.children { 309 | l += rtaAlignOf(child.Len()) 310 | } 311 | l += syscall.SizeofRtAttr 312 | return rtaAlignOf(l + len(a.Data)) 313 | } 314 | 315 | // Serialize the RtAttr into a byte array. 316 | // This can't just unsafe.cast because it must iterate through children. 317 | func (a *RtAttr) Serialize() []byte { 318 | native := NativeEndian() 319 | 320 | length := a.Len() 321 | buf := make([]byte, rtaAlignOf(length)) 322 | 323 | next := 4 324 | if a.Data != nil { 325 | copy(buf[next:], a.Data) 326 | next += rtaAlignOf(len(a.Data)) 327 | } 328 | if len(a.children) > 0 { 329 | for _, child := range a.children { 330 | childBuf := child.Serialize() 331 | copy(buf[next:], childBuf) 332 | next += rtaAlignOf(len(childBuf)) 333 | } 334 | } 335 | 336 | if l := uint16(length); l != 0 { 337 | native.PutUint16(buf[0:2], l) 338 | } 339 | native.PutUint16(buf[2:4], a.Type) 340 | return buf 341 | } 342 | 343 | // NetlinkRequest is a netlink request. 344 | type NetlinkRequest struct { 345 | syscall.NlMsghdr 346 | Data []NetlinkRequestData 347 | RawData []byte 348 | } 349 | 350 | // NewNetlinkRequest create a new netlink request from proto and flags 351 | // Note the Len value will be inaccurate once data is added until 352 | // the message is serialized. 353 | func NewNetlinkRequest(proto, flags int) *NetlinkRequest { 354 | return &NetlinkRequest{ 355 | NlMsghdr: syscall.NlMsghdr{ 356 | Len: uint32(syscall.SizeofNlMsghdr), 357 | Type: uint16(proto), 358 | Flags: syscall.NLM_F_REQUEST | uint16(flags), 359 | Seq: atomic.AddUint32(&nextSeqNr, 1), 360 | // Pid: uint32(os.Getpid()), 361 | }, 362 | } 363 | } 364 | 365 | // Serialize the Netlink Request into a byte array. 366 | func (req *NetlinkRequest) Serialize() []byte { 367 | length := syscall.SizeofNlMsghdr 368 | dataBytes := make([][]byte, len(req.Data)) 369 | for i, data := range req.Data { 370 | dataBytes[i] = data.Serialize() 371 | length = length + len(dataBytes[i]) 372 | } 373 | length += len(req.RawData) 374 | 375 | req.Len = uint32(length) 376 | b := make([]byte, length) 377 | hdr := (*(*[syscall.SizeofNlMsghdr]byte)(unsafe.Pointer(req)))[:] 378 | next := syscall.SizeofNlMsghdr 379 | copy(b[0:next], hdr) 380 | for _, data := range dataBytes { 381 | for _, dataByte := range data { 382 | b[next] = dataByte 383 | next = next + 1 384 | } 385 | } 386 | // Add the raw data if any 387 | if len(req.RawData) > 0 { 388 | copy(b[next:length], req.RawData) 389 | } 390 | return b 391 | } 392 | 393 | // AddData add data to request. 394 | func (req *NetlinkRequest) AddData(data NetlinkRequestData) { 395 | if data != nil { 396 | req.Data = append(req.Data, data) 397 | } 398 | } 399 | 400 | // AddRawData adds raw bytes to the end of the NetlinkRequest object during serialization. 401 | func (req *NetlinkRequest) AddRawData(data []byte) { 402 | if data != nil { 403 | req.RawData = append(req.RawData, data...) 404 | } 405 | } 406 | 407 | // Uint8Attr . 408 | func Uint8Attr(v uint8) []byte { 409 | return []byte{byte(v)} 410 | } 411 | 412 | // Uint16Attr . 413 | func Uint16Attr(v uint16) []byte { 414 | native := NativeEndian() 415 | bytes := make([]byte, 2) 416 | native.PutUint16(bytes, v) 417 | return bytes 418 | } 419 | 420 | // Uint32Attr . 421 | func Uint32Attr(v uint32) []byte { 422 | native := NativeEndian() 423 | bytes := make([]byte, 4) 424 | native.PutUint32(bytes, v) 425 | return bytes 426 | } 427 | 428 | // Uint32Attribute . 429 | type Uint32Attribute struct { 430 | Type uint16 431 | Value uint32 432 | } 433 | 434 | // Serialize . 435 | func (a *Uint32Attribute) Serialize() []byte { 436 | native := NativeEndian() 437 | buf := make([]byte, rtaAlignOf(8)) 438 | native.PutUint16(buf[0:2], 8) 439 | native.PutUint16(buf[2:4], a.Type) 440 | 441 | if a.Type&NLA_F_NET_BYTEORDER != 0 { 442 | binary.BigEndian.PutUint32(buf[4:], a.Value) 443 | } else { 444 | native.PutUint32(buf[4:], a.Value) 445 | } 446 | return buf 447 | } 448 | 449 | // Len . 450 | func (a *Uint32Attribute) Len() int { 451 | return 8 452 | } 453 | 454 | // ZeroTerminated . 455 | func ZeroTerminated(s string) []byte { 456 | bytes := make([]byte, len(s)+1) 457 | for i := 0; i < len(s); i++ { 458 | bytes[i] = s[i] 459 | } 460 | bytes[len(s)] = 0 461 | return bytes 462 | } 463 | -------------------------------------------------------------------------------- /ipset_linux.go: -------------------------------------------------------------------------------- 1 | package ipset 2 | 3 | import ( 4 | "net/netip" 5 | 6 | "github.com/nadoo/ipset/internal/netlink" 7 | ) 8 | 9 | var nl *netlink.NetLink 10 | 11 | // Option is used to set parameters of ipset operations. 12 | type Option = netlink.Option 13 | 14 | // OptIPv6 sets `family inet6` parameter to operations. 15 | func OptIPv6() Option { return func(opts *netlink.Options) { opts.IPv6 = true } } 16 | 17 | // OptTimeout sets `timeout xx` parameter to operations. 18 | func OptTimeout(timeout uint32) Option { return func(opts *netlink.Options) { opts.Timeout = timeout } } 19 | 20 | func OptExcl() Option { return func(opts *netlink.Options) { opts.Excl = true } } 21 | 22 | // Init prepares a netlink socket of ipset. 23 | func Init() (err error) { 24 | nl, err = netlink.New() 25 | return err 26 | } 27 | 28 | // Create creates a new set. 29 | func Create(setName string, opts ...Option) (err error) { 30 | return nl.CreateSet(setName, opts...) 31 | } 32 | 33 | // Destroy destroys a named set. 34 | func Destroy(setName string) (err error) { 35 | return nl.DestroySet(setName) 36 | } 37 | 38 | // Flush flushes a named set. 39 | func Flush(setName string) (err error) { 40 | return nl.FlushSet(setName) 41 | } 42 | 43 | // Add adds an entry to the named set. 44 | // entry could be: "1.1.1.1" or "192.168.1.0/24" or "2022::1" or "2022::1/32". 45 | func Add(setName, entry string, opts ...Option) (err error) { 46 | return handleEntry(netlink.IPSET_CMD_ADD, setName, entry, opts...) 47 | } 48 | 49 | // Del deletes an entry from the named set. 50 | // entry could be: "1.1.1.1" or "192.168.1.0/24" or "2022::1" or "2022::1/32". 51 | func Del(setName, entry string) (err error) { 52 | return handleEntry(netlink.IPSET_CMD_DEL, setName, entry) 53 | } 54 | 55 | func handleEntry(cmd int, setName, entry string, opts ...Option) error { 56 | ip, err := netip.ParseAddr(entry) 57 | if err == nil { 58 | return nl.HandleAddr(cmd, setName, ip, netip.Prefix{}, opts...) 59 | } 60 | cidr, err := netip.ParsePrefix(entry) 61 | if err == nil { 62 | return nl.HandleAddr(cmd, setName, cidr.Addr(), cidr, opts...) 63 | } 64 | return err 65 | } 66 | 67 | // AddAddr adds an addr to the named set. 68 | func AddAddr(setName string, ip netip.Addr, opts ...Option) (err error) { 69 | return nl.HandleAddr(netlink.IPSET_CMD_ADD, setName, ip, netip.Prefix{}, opts...) 70 | } 71 | 72 | // DelAddr deletes an addr from the named set. 73 | func DelAddr(setName string, ip netip.Addr) (err error) { 74 | return nl.HandleAddr(netlink.IPSET_CMD_DEL, setName, ip, netip.Prefix{}) 75 | } 76 | 77 | // AddPrefix adds a cidr to the named set. 78 | func AddPrefix(setName string, cidr netip.Prefix, opts ...Option) (err error) { 79 | return nl.HandleAddr(netlink.IPSET_CMD_ADD, setName, cidr.Addr(), cidr, opts...) 80 | } 81 | 82 | // DelPrefix deletes a cidr from the named set. 83 | func DelPrefix(setName string, cidr netip.Prefix) (err error) { 84 | return nl.HandleAddr(netlink.IPSET_CMD_DEL, setName, cidr.Addr(), cidr) 85 | } 86 | --------------------------------------------------------------------------------