/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2021 Ng Peng Nam Sean * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Copyright (C) The Internet Society (2003). All Rights Reserved. * * This document and translations of it may be copied and furnished to * others, and derivative works that comment on or otherwise explain it * or assist in its implementation may be prepared, copied, published * and distributed, in whole or in part, without restriction of any * kind, provided that the above copyright notice and this paragraph are * included on all such copies and derivative works. However, this * document itself may not be modified in any way, such as by removing * the copyright notice or references to the Internet Society or other * Internet organizations, except as needed for the purpose of * developing Internet standards in which case the procedures for * copyrights defined in the Internet Standards process must be * followed, or as required to translate it into languages other than * English. * * The limited permissions granted above are perpetual and will not be * revoked by the Internet Society or its successors or assignees. * * This document and the information contained herein is provided on an * "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING * TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION * HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. */ /* * This file contains structures and constants for RFC 3549 (Netlink) * protocol. Some values have been taken from Linux implementation. */ #ifndef _NETLINK_NETLINK_H_ #define _NETLINK_NETLINK_H_ #include <sys/param.h> #include <sys/socket.h> struct sockaddr_nl { uint8_t nl_len; /* sizeof(sockaddr_nl) */ sa_family_t nl_family; /* netlink family */ uint16_t nl_pad; /* reserved, set to 0 */ uint32_t nl_pid; /* desired port ID, 0 for auto-select */ uint32_t nl_groups; /* multicast groups mask to bind to */ }; #define SOL_NETLINK 270 /* Netlink socket options */ #define NETLINK_ADD_MEMBERSHIP 1 /* Subscribe for the specified group notifications */ #define NETLINK_DROP_MEMBERSHIP 2 /* Unsubscribe from the specified group */ #define NETLINK_PKTINFO 3 /* XXX: not supported */ #define NETLINK_BROADCAST_ERROR 4 /* XXX: not supported */ #define NETLINK_NO_ENOBUFS 5 /* XXX: not supported */ #define NETLINK_RX_RING 6 /* XXX: not supported */ #define NETLINK_TX_RING 7 /* XXX: not supported */ #define NETLINK_LISTEN_ALL_NSID 8 /* XXX: not supported */ #define NETLINK_LIST_MEMBERSHIPS 9 #define NETLINK_CAP_ACK 10 /* Send only original message header in the reply */ #define NETLINK_EXT_ACK 11 /* Ack support for receiving additional TLVs in ack */ #define NETLINK_GET_STRICT_CHK 12 /* Strict header checking */ #define NETLINK_MSG_INFO 257 /* (FreeBSD-specific) Receive message originator data in cmsg */ /* * RFC 3549, 2.3.2 Netlink Message Header */ struct nlmsghdr { uint32_t nlmsg_len; /* Length of message including header */ uint16_t nlmsg_type; /* Message type identifier */ uint16_t nlmsg_flags; /* Flags (NLM_F_) */ uint32_t nlmsg_seq; /* Sequence number */ uint32_t nlmsg_pid; /* Sending process port ID */ }; /* * RFC 3549, 2.3.2 standard flag bits (nlmsg_flags) */ #define NLM_F_REQUEST 0x01 /* Indicateds request to kernel */ #define NLM_F_MULTI 0x02 /* Message is part of a group terminated by NLMSG_DONE msg */ #define NLM_F_ACK 0x04 /* Reply with ack message containing resulting error code */ #define NLM_F_ECHO 0x08 /* (not supported) Echo this request back */ #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ /* * RFC 3549, 2.3.2 Additional flag bits for GET requests */ #define NLM_F_ROOT 0x100 /* Return the complete table */ #define NLM_F_MATCH 0x200 /* Return all entries matching criteria */ #define NLM_F_ATOMIC 0x400 /* Return an atomic snapshot (ignored) */ #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH) /* * RFC 3549, 2.3.2 Additional flag bits for NEW requests */ #define NLM_F_REPLACE 0x100 /* Replace existing matching config object */ #define NLM_F_EXCL 0x200 /* Don't replace the object if exists */ #define NLM_F_CREATE 0x400 /* Create if it does not exist */ #define NLM_F_APPEND 0x800 /* Add to end of list */ /* Modifiers to DELETE requests */ #define NLM_F_NONREC 0x100 /* Do not delete recursively */ /* Flags for ACK message */ #define NLM_F_CAPPED 0x100 /* request was capped */ #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ /* * RFC 3549, 2.3.2 standard message types (nlmsg_type). */ #define NLMSG_NOOP 0x1 /* Message is ignored. */ #define NLMSG_ERROR 0x2 /* reply error code reporting */ #define NLMSG_DONE 0x3 /* Message terminates a multipart message. */ #define NLMSG_OVERRUN 0x4 /* overrun detected, data is lost */ #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ /* * Defition of numbers assigned to the netlink subsystems. */ #define NETLINK_ROUTE 0 /* Routing/device hook */ #define NETLINK_UNUSED 1 /* not supported */ #define NETLINK_USERSOCK 2 /* not supported */ #define NETLINK_FIREWALL 3 /* not supported */ #define NETLINK_SOCK_DIAG 4 /* not supported */ #define NETLINK_NFLOG 5 /* not supported */ #define NETLINK_XFRM 6 /* (not supported) PF_SETKEY */ #define NETLINK_SELINUX 7 /* not supported */ #define NETLINK_ISCSI 8 /* not supported */ #define NETLINK_AUDIT 9 /* not supported */ #define NETLINK_FIB_LOOKUP 10 /* not supported */ #define NETLINK_CONNECTOR 11 /* not supported */ #define NETLINK_NETFILTER 12 /* not supported */ #define NETLINK_IP6_FW 13 /* not supported */ #define NETLINK_DNRTMSG 14 /* not supported */ #define NETLINK_KOBJECT_UEVENT 15 /* not supported */ #define NETLINK_GENERIC 16 /* Generic netlink (dynamic families) */ /* * RFC 3549, 2.3.2.2 The ACK Netlink Message */ struct nlmsgerr { int error; struct nlmsghdr msg; }; enum nlmsgerr_attrs { NLMSGERR_ATTR_UNUSED, NLMSGERR_ATTR_MSG = 1, /* string, error message */ NLMSGERR_ATTR_OFFS = 2, /* u32, offset of the invalid attr from nl header */ NLMSGERR_ATTR_COOKIE = 3, /* binary, data to pass to userland */ NLMSGERR_ATTR_POLICY = 4, /* not supported */ __NLMSGERR_ATTR_MAX, NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 }; /* FreeBSD-specific debugging info */ enum nlmsginfo_attrs { NLMSGINFO_ATTR_UNUSED, NLMSGINFO_ATTR_PROCESS_ID = 1, /* u32, source process PID */ NLMSGINFO_ATTR_PORT_ID = 2, /* u32, source socket nl_pid */ NLMSGINFO_ATTR_SEQ_ID = 3, /* u32, source message seq_id */ }; #define NL_ITEM_ALIGN_SIZE sizeof(uint32_t) #define NL_ITEM_ALIGN(_len) __align_up(_len, NL_ITEM_ALIGN_SIZE) #define NL_ITEM_DATA(_ptr, _off) ((void *)((char *)(_ptr) + _off)) #define NL_ITEM_DATA_CONST(_ptr, _off) ((const void *)((const char *)(_ptr) + _off)) #define NL_ITEM_OK(_ptr, _len, _hlen, _LEN_M) \ ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len)) #define NL_ITEM_NEXT(_ptr, _LEN_M) ((__typeof(_ptr))((char *)(_ptr) + _LEN_M(_ptr))) #define NL_ITEM_ITER(_ptr, _len, _LEN_MACRO) \ ((_len) -= _LEN_MACRO(_ptr), NL_ITEM_NEXT(_ptr, _LEN_MACRO)) /* part of netlink(3) API */ #define NLMSG_ALIGNTO NL_ITEM_ALIGN_SIZE #define NLMSG_ALIGN(_len) NL_ITEM_ALIGN(_len) #ifndef _KERNEL /* part of netlink(3) API */ #define NLMSG_HDRLEN (sizeof(struct nlmsghdr)) #define NLMSG_LENGTH(_len) ((_len) + NLMSG_HDRLEN) #define NLMSG_SPACE(_len) NLMSG_ALIGN(NLMSG_LENGTH(_len)) #define NLMSG_DATA(_hdr) NL_ITEM_DATA(_hdr, NLMSG_HDRLEN) #define _NLMSG_LEN(_hdr) ((_hdr)->nlmsg_len) #define _NLMSG_ALIGNED_LEN(_hdr) NLMSG_ALIGN(_NLMSG_LEN(_hdr)) #define NLMSG_OK(_hdr, _len) NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN) #define NLMSG_PAYLOAD(_hdr,_len) (_NLMSG_LEN(_hdr) - NLMSG_SPACE((_len))) #define NLMSG_NEXT(_hdr, _len) NL_ITEM_ITER(_hdr, _len, _NLMSG_ALIGNED_LEN) #else #define NLMSG_HDRLEN (NLMSG_ALIGN(sizeof(struct nlmsghdr))) #endif /* * Base netlink attribute TLV header. */ struct nlattr { uint16_t nla_len; /* Total attribute length */ uint16_t nla_type; /* Attribute type */ }; /* * * nl_type field enconding: * * 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |N|O| Attribute type | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * N - attribute contains other attributes (mostly unused) * O - encoded in network byte order (mostly unused) * Note: N & O are mutually exclusive * * Note: attribute type value scope normally is either parent attribute * or the message/message group. */ #define NLA_F_NESTED (1 << 15) #define NLA_F_NET_BYTEORDER (1 << 14) #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) #ifndef _KERNEL #define NLA_ALIGNTO NL_ITEM_ALIGN_SIZE #define NLA_ALIGN(_len) NL_ITEM_ALIGN(_len) #define NLA_HDRLEN ((int)sizeof(struct nlattr)) #endif #endif
