2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2021 Ng Peng Nam Sean
5 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
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57 * This file contains structures and constants for RFC 3549 (Netlink)
58 * protocol. Some values have been taken from Linux implementation.
61 #ifndef _NETLINK_NETLINK_H_
62 #define _NETLINK_NETLINK_H_
64 #include <sys/types.h>
65 #include <sys/socket.h>
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 */
75 #define SOL_NETLINK 270
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 */
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 */
92 #define NETLINK_MSG_INFO 257 /* (FreeBSD-specific) Receive message originator data in cmsg */
95 * RFC 3549, 2.3.2 Netlink Message Header
98 uint32_t nlmsg_len; /* Length of message including header */
99 uint16_t nlmsg_type; /* Message type identifier */
100 uint16_t nlmsg_flags; /* Flags (NLM_F_) */
101 uint32_t nlmsg_seq; /* Sequence number */
102 uint32_t nlmsg_pid; /* Sending process port ID */
106 * RFC 3549, 2.3.2 standard flag bits (nlmsg_flags)
108 #define NLM_F_REQUEST 0x01 /* Indicateds request to kernel */
109 #define NLM_F_MULTI 0x02 /* Message is part of a group terminated by NLMSG_DONE msg */
110 #define NLM_F_ACK 0x04 /* Reply with ack message containing resulting error code */
111 #define NLM_F_ECHO 0x08 /* (not supported) Echo this request back */
112 #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */
113 #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */
116 * RFC 3549, 2.3.2 Additional flag bits for GET requests
118 #define NLM_F_ROOT 0x100 /* Return the complete table */
119 #define NLM_F_MATCH 0x200 /* Return all entries matching criteria */
120 #define NLM_F_ATOMIC 0x400 /* Return an atomic snapshot (ignored) */
121 #define NLM_F_DUMP (NLM_F_ROOT | NLM_F_MATCH)
124 * RFC 3549, 2.3.2 Additional flag bits for NEW requests
126 #define NLM_F_REPLACE 0x100 /* Replace existing matching config object */
127 #define NLM_F_EXCL 0x200 /* Don't replace the object if exists */
128 #define NLM_F_CREATE 0x400 /* Create if it does not exist */
129 #define NLM_F_APPEND 0x800 /* Add to end of list */
131 /* Modifiers to DELETE requests */
132 #define NLM_F_NONREC 0x100 /* Do not delete recursively */
134 /* Flags for ACK message */
135 #define NLM_F_CAPPED 0x100 /* request was capped */
136 #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
139 * RFC 3549, 2.3.2 standard message types (nlmsg_type).
141 #define NLMSG_NOOP 0x1 /* Message is ignored. */
142 #define NLMSG_ERROR 0x2 /* reply error code reporting */
143 #define NLMSG_DONE 0x3 /* Message terminates a multipart message. */
144 #define NLMSG_OVERRUN 0x4 /* overrun detected, data is lost */
146 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
149 * Defition of numbers assigned to the netlink subsystems.
151 #define NETLINK_ROUTE 0 /* Routing/device hook */
152 #define NETLINK_UNUSED 1 /* not supported */
153 #define NETLINK_USERSOCK 2 /* not supported */
154 #define NETLINK_FIREWALL 3 /* not supported */
155 #define NETLINK_SOCK_DIAG 4 /* not supported */
156 #define NETLINK_NFLOG 5 /* not supported */
157 #define NETLINK_XFRM 6 /* (not supported) PF_SETKEY */
158 #define NETLINK_SELINUX 7 /* not supported */
159 #define NETLINK_ISCSI 8 /* not supported */
160 #define NETLINK_AUDIT 9 /* not supported */
161 #define NETLINK_FIB_LOOKUP 10 /* not supported */
162 #define NETLINK_CONNECTOR 11 /* not supported */
163 #define NETLINK_NETFILTER 12 /* not supported */
164 #define NETLINK_IP6_FW 13 /* not supported */
165 #define NETLINK_DNRTMSG 14 /* not supported */
166 #define NETLINK_KOBJECT_UEVENT 15 /* not supported */
167 #define NETLINK_GENERIC 16 /* Generic netlink (dynamic families) */
170 * RFC 3549, 2.3.2.2 The ACK Netlink Message
177 enum nlmsgerr_attrs {
178 NLMSGERR_ATTR_UNUSED,
179 NLMSGERR_ATTR_MSG = 1, /* string, error message */
180 NLMSGERR_ATTR_OFFS = 2, /* u32, offset of the invalid attr from nl header */
181 NLMSGERR_ATTR_COOKIE = 3, /* binary, data to pass to userland */
182 NLMSGERR_ATTR_POLICY = 4, /* not supported */
184 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
187 /* FreeBSD-specific debugging info */
189 enum nlmsginfo_attrs {
190 NLMSGINFO_ATTR_UNUSED,
191 NLMSGINFO_ATTR_PROCESS_ID = 1, /* u32, source process PID */
192 NLMSGINFO_ATTR_PORT_ID = 2, /* u32, source socket nl_pid */
193 NLMSGINFO_ATTR_SEQ_ID = 3, /* u32, source message seq_id */
198 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
200 #define NL_ITEM_ALIGN_SIZE sizeof(uint32_t)
201 #define NL_ITEM_ALIGN(_len) roundup2(_len, NL_ITEM_ALIGN_SIZE)
202 #define NL_ITEM_DATA(_ptr, _off) ((void *)((char *)(_ptr) + _off))
203 #define NL_ITEM_DATA_CONST(_ptr, _off) ((const void *)((const char *)(_ptr) + _off))
205 #define NL_ITEM_OK(_ptr, _len, _hlen, _LEN_M) \
206 ((_len) >= _hlen && _LEN_M(_ptr) >= _hlen && _LEN_M(_ptr) <= (_len))
207 #define NL_ITEM_NEXT(_ptr, _LEN_M) ((typeof(_ptr))((char *)(_ptr) + _LEN_M(_ptr)))
208 #define NL_ITEM_ITER(_ptr, _len, _LEN_MACRO) \
209 ((_len) -= _LEN_MACRO(_ptr), NL_ITEM_NEXT(_ptr, _LEN_MACRO))
213 /* part of netlink(3) API */
214 #define NLMSG_ALIGNTO NL_ITEM_ALIGN_SIZE
215 #define NLMSG_ALIGN(_len) NL_ITEM_ALIGN(_len)
216 #define NLMSG_HDRLEN ((int)sizeof(struct nlmsghdr))
217 #define NLMSG_LENGTH(_len) ((_len) + NLMSG_HDRLEN)
218 #define NLMSG_SPACE(_len) NLMSG_ALIGN(NLMSG_LENGTH(_len))
219 #define NLMSG_DATA(_hdr) NL_ITEM_DATA(_hdr, NLMSG_HDRLEN)
220 #define _NLMSG_LEN(_hdr) ((int)(_hdr)->nlmsg_len)
221 #define _NLMSG_ALIGNED_LEN(_hdr) NLMSG_ALIGN(_NLMSG_LEN(_hdr))
222 #define NLMSG_OK(_hdr, _len) NL_ITEM_OK(_hdr, _len, NLMSG_HDRLEN, _NLMSG_LEN)
223 #define NLMSG_PAYLOAD(_hdr,_len) (_NLMSG_LEN(_hdr) - NLMSG_SPACE((_len)))
224 #define NLMSG_NEXT(_hdr, _len) NL_ITEM_ITER(_hdr, _len, _NLMSG_ALIGNED_LEN)
227 #define NLMSG_ALIGNTO 4U
228 #define NLMSG_ALIGN(len) (((len) + NLMSG_ALIGNTO - 1) & ~(NLMSG_ALIGNTO - 1))
229 #define NLMSG_HDRLEN ((int)NLMSG_ALIGN(sizeof(struct nlmsghdr)))
233 * Base netlink attribute TLV header.
236 uint16_t nla_len; /* Total attribute length */
237 uint16_t nla_type; /* Attribute type */
242 * nl_type field enconding:
245 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
246 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
247 * |N|O| Attribute type |
248 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
249 * N - attribute contains other attributes (mostly unused)
250 * O - encoded in network byte order (mostly unused)
251 * Note: N & O are mutually exclusive
253 * Note: attribute type value scope normally is either parent attribute
254 * or the message/message group.
257 #define NLA_F_NESTED (1 << 15)
258 #define NLA_F_NET_BYTEORDER (1 << 14)
259 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
262 #define NLA_ALIGNTO NL_ITEM_ALIGN_SIZE
263 #define NLA_ALIGN(_len) NL_ITEM_ALIGN(_len)
264 #define NLA_HDRLEN ((int)sizeof(struct nlattr))