1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2021 Ng Peng Nam Sean 5 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * Copyright (C) The Internet Society (2003). All Rights Reserved. 29 * 30 * This document and translations of it may be copied and furnished to 31 * others, and derivative works that comment on or otherwise explain it 32 * or assist in its implementation may be prepared, copied, published 33 * and distributed, in whole or in part, without restriction of any 34 * kind, provided that the above copyright notice and this paragraph are 35 * included on all such copies and derivative works. However, this 36 * document itself may not be modified in any way, such as by removing 37 * the copyright notice or references to the Internet Society or other 38 * Internet organizations, except as needed for the purpose of 39 * developing Internet standards in which case the procedures for 40 * copyrights defined in the Internet Standards process must be 41 * followed, or as required to translate it into languages other than 42 * English. 43 * 44 * The limited permissions granted above are perpetual and will not be 45 * revoked by the Internet Society or its successors or assignees. 46 * 47 * This document and the information contained herein is provided on an 48 * "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING 49 * TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING 50 * BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION 51 * HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF 52 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 53 54 */ 55 56 /* 57 * This file contains structures and constants for RFC 3549 (Netlink) 58 * protocol. Some values have been taken from Linux implementation. 59 */ 60 61 #ifndef _NETLINK_NETLINK_H_ 62 #define _NETLINK_NETLINK_H_ 63 64 #include <sys/types.h> 65 #include <sys/socket.h> 66 67 struct sockaddr_nl { 68 uint8_t nl_len; /* sizeof(sockaddr_nl) */ 69 sa_family_t nl_family; /* netlink family */ 70 uint16_t nl_pad; /* reserved, set to 0 */ 71 uint32_t nl_pid; /* desired port ID, 0 for auto-select */ 72 uint32_t nl_groups; /* multicast groups mask to bind to */ 73 }; 74 75 #define SOL_NETLINK 270 76 77 /* Netlink socket options */ 78 #define NETLINK_ADD_MEMBERSHIP 1 /* Subscribe for the specified group notifications */ 79 #define NETLINK_DROP_MEMBERSHIP 2 /* Unsubscribe from the specified group */ 80 #define NETLINK_PKTINFO 3 /* XXX: not supported */ 81 #define NETLINK_BROADCAST_ERROR 4 /* XXX: not supported */ 82 #define NETLINK_NO_ENOBUFS 5 /* XXX: not supported */ 83 #define NETLINK_RX_RING 6 /* XXX: not supported */ 84 #define NETLINK_TX_RING 7 /* XXX: not supported */ 85 #define NETLINK_LISTEN_ALL_NSID 8 /* XXX: not supported */ 86 87 #define NETLINK_LIST_MEMBERSHIPS 9 88 #define NETLINK_CAP_ACK 10 /* Send only original message header in the reply */ 89 #define NETLINK_EXT_ACK 11 /* Ack support for receiving additional TLVs in ack */ 90 #define NETLINK_GET_STRICT_CHK 12 /* Strict header checking */ 91 92 93 /* 94 * RFC 3549, 2.3.2 Netlink Message Header 95 */ 96 struct nlmsghdr { 97 uint32_t nlmsg_len; /* Length of message including header */ 98 uint16_t nlmsg_type; /* Message type identifier */ 99 uint16_t nlmsg_flags; /* Flags (NLM_F_) */ 100 uint32_t nlmsg_seq; /* Sequence number */ 101 uint32_t nlmsg_pid; /* Sending process port ID */ 102 }; 103 104 /* 105 * RFC 3549, 2.3.2 standard flag bits (nlmsg_flags) 106 */ 107 #define NLM_F_REQUEST 0x01 /* Indicateds request to kernel */ 108 #define NLM_F_MULTI 0x02 /* Message is part of a group terminated by NLMSG_DONE msg */ 109 #define NLM_F_ACK 0x04 /* Reply with ack message containing resulting error code */ 110 #define NLM_F_ECHO 0x08 /* (not supported) Echo this request back */ 111 #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ 112 #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ 113 114 /* 115 * RFC 3549, 2.3.2 Additional flag bits for GET requests 116 */ 117 #define NLM_F_ROOT 0x100 /* Return the complete table */ 118 #define NLM_F_MATCH 0x200 /* Return all entries matching criteria */ 119 #define NLM_F_ATOMIC 0x400 /* Return an atomic snapshot (ignored) */ 120 #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH) 121 122 /* 123 * RFC 3549, 2.3.2 Additional flag bits for NEW requests 124 */ 125 #define NLM_F_REPLACE 0x100 /* Replace existing matching config object */ 126 #define NLM_F_EXCL 0x200 /* Don't replace the object if exists */ 127 #define NLM_F_CREATE 0x400 /* Create if it does not exist */ 128 #define NLM_F_APPEND 0x800 /* Add to end of list */ 129 130 /* Modifiers to DELETE requests */ 131 #define NLM_F_NONREC 0x100 /* Do not delete recursively */ 132 133 /* Flags for ACK message */ 134 #define NLM_F_CAPPED 0x100 /* request was capped */ 135 #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ 136 137 /* 138 * RFC 3549, 2.3.2 standard message types (nlmsg_type). 139 */ 140 #define NLMSG_NOOP 0x1 /* Message is ignored. */ 141 #define NLMSG_ERROR 0x2 /* reply error code reporting */ 142 #define NLMSG_DONE 0x3 /* Message terminates a multipart message. */ 143 #define NLMSG_OVERRUN 0x4 /* overrun detected, data is lost */ 144 145 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ 146 147 /* 148 * Defition of numbers assigned to the netlink subsystems. 149 */ 150 #define NETLINK_ROUTE 0 /* Routing/device hook */ 151 #define NETLINK_UNUSED 1 /* not supported */ 152 #define NETLINK_USERSOCK 2 /* not supported */ 153 #define NETLINK_FIREWALL 3 /* not supported */ 154 #define NETLINK_SOCK_DIAG 4 /* not supported */ 155 #define NETLINK_NFLOG 5 /* not supported */ 156 #define NETLINK_XFRM 6 /* (not supported) PF_SETKEY */ 157 #define NETLINK_SELINUX 7 /* not supported */ 158 #define NETLINK_ISCSI 8 /* not supported */ 159 #define NETLINK_AUDIT 9 /* not supported */ 160 #define NETLINK_FIB_LOOKUP 10 /* not supported */ 161 #define NETLINK_CONNECTOR 11 /* not supported */ 162 #define NETLINK_NETFILTER 12 /* not supported */ 163 #define NETLINK_IP6_FW 13 /* not supported */ 164 #define NETLINK_DNRTMSG 14 /* not supported */ 165 #define NETLINK_KOBJECT_UEVENT 15 /* not supported */ 166 #define NETLINK_GENERIC 16 /* Generic netlink (dynamic families) */ 167 168 /* 169 * RFC 3549, 2.3.2.2 The ACK Netlink Message 170 */ 171 struct nlmsgerr { 172 int error; 173 struct nlmsghdr msg; 174 }; 175 176 enum nlmsgerr_attrs { 177 NLMSGERR_ATTR_UNUSED, 178 NLMSGERR_ATTR_MSG = 1, /* string, error message */ 179 NLMSGERR_ATTR_OFFS = 2, /* u32, offset of the invalid attr from nl header */ 180 NLMSGERR_ATTR_COOKIE = 3, /* binary, data to pass to userland */ 181 NLMSGERR_ATTR_POLICY = 4, /* not supported */ 182 __NLMSGERR_ATTR_MAX, 183 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 184 }; 185 186 187 #ifndef roundup2 188 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 189 #endif 190 #define NL_ITEM_ALIGN_SIZE sizeof(uint32_t) 191 #define NL_ITEM_ALIGN(_len) roundup2(_len, NL_ITEM_ALIGN_SIZE) 192 #define NL_ITEM_DATA(_ptr, _off) ((void *)((char *)(_ptr) + _off)) 193 #define NL_ITEM_DATA_CONST(_ptr, _off) ((const void *)((const char *)(_ptr) + _off)) 194 195 #define NL_ITEM_OK(_ptr, _len, _hlen, _LEN_M) \ 196 ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len)) 197 #define NL_ITEM_NEXT(_ptr, _LEN_M) ((typeof(_ptr))((char *)(_ptr) + _LEN_M(_ptr))) 198 #define NL_ITEM_ITER(_ptr, _len, _LEN_MACRO) \ 199 ((_len) -= _LEN_MACRO(_ptr), NL_ITEM_NEXT(_ptr, _LEN_MACRO)) 200 201 202 #ifndef _KERNEL 203 /* part of netlink(3) API */ 204 #define NLMSG_ALIGNTO NL_ITEM_ALIGN_SIZE 205 #define NLMSG_ALIGN(_len) NL_ITEM_ALIGN(_len) 206 #define NLMSG_HDRLEN ((int)sizeof(struct nlmsghdr)) 207 #define NLMSG_LENGTH(_len) ((_len) + NLMSG_HDRLEN) 208 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(_len)) 209 #define NLMSG_DATA(_hdr) NL_ITEM_DATA(_hdr, NLMSG_HDRLEN) 210 #define _NLMSG_LEN(_hdr) ((int)(_hdr)->nlmsg_len) 211 #define _NLMSG_ALIGNED_LEN(_hdr) NLMSG_ALIGN(_NLMSG_LEN(_hdr)) 212 #define NLMSG_OK(_hdr, _len) NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN) 213 #define NLMSG_PAYLOAD(_hdr,_len) (_NLMSG_LEN(_hdr) - NLMSG_SPACE((_len))) 214 #define NLMSG_NEXT(_hdr, _len) NL_ITEM_ITER(_hdr, _len, _NLMSG_ALIGNED_LEN) 215 216 #else 217 #define NLMSG_ALIGNTO 4U 218 #define NLMSG_ALIGN(len) (((len) + NLMSG_ALIGNTO - 1) & ~(NLMSG_ALIGNTO - 1)) 219 #define NLMSG_HDRLEN ((int)NLMSG_ALIGN(sizeof(struct nlmsghdr))) 220 #endif 221 222 /* 223 * Base netlink attribute TLV header. 224 */ 225 struct nlattr { 226 uint16_t nla_len; /* Total attribute length */ 227 uint16_t nla_type; /* Attribute type */ 228 }; 229 230 /* 231 * 232 * nl_type field enconding: 233 * 234 * 0 1 235 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 236 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 237 * |N|O| Attribute type | 238 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 239 * N - attribute contains other attributes (mostly unused) 240 * O - encoded in network byte order (mostly unused) 241 * Note: N & O are mutually exclusive 242 * 243 * Note: attribute type value scope normally is either parent attribute 244 * or the message/message group. 245 */ 246 247 #define NLA_F_NESTED (1 << 15) 248 #define NLA_F_NET_BYTEORDER (1 << 14) 249 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) 250 251 #ifndef _KERNEL 252 #define NLA_ALIGNTO NL_ITEM_ALIGN_SIZE 253 #define NLA_ALIGN(_len) NL_ITEM_ALIGN(_len) 254 #define NLA_HDRLEN ((int)sizeof(struct nlattr)) 255 #endif 256 257 #endif 258