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ba914908 | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
910773dc SH |
2 | #ifndef __LINUX_NETLINK_H |
3 | #define __LINUX_NETLINK_H | |
0633baa1 | 4 | |
2953235e | 5 | #include <linux/const.h> |
9044a454 | 6 | #include <linux/socket.h> /* for __kernel_sa_family_t */ |
0633baa1 SH |
7 | #include <linux/types.h> |
8 | ||
9 | #define NETLINK_ROUTE 0 /* Routing/device hook */ | |
1d35a127 | 10 | #define NETLINK_UNUSED 1 /* Unused number */ |
0633baa1 | 11 | #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */ |
5e4dc84f | 12 | #define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */ |
a08d2590 | 13 | #define NETLINK_SOCK_DIAG 4 /* socket monitoring */ |
0633baa1 SH |
14 | #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */ |
15 | #define NETLINK_XFRM 6 /* ipsec */ | |
16 | #define NETLINK_SELINUX 7 /* SELinux event notifications */ | |
351efcde | 17 | #define NETLINK_ISCSI 8 /* Open-iSCSI */ |
0633baa1 | 18 | #define NETLINK_AUDIT 9 /* auditing */ |
6864c1e7 | 19 | #define NETLINK_FIB_LOOKUP 10 |
2034ee97 | 20 | #define NETLINK_CONNECTOR 11 |
6864c1e7 | 21 | #define NETLINK_NETFILTER 12 /* netfilter subsystem */ |
0633baa1 SH |
22 | #define NETLINK_IP6_FW 13 |
23 | #define NETLINK_DNRTMSG 14 /* DECnet routing messages */ | |
d639d9d1 | 24 | #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */ |
2034ee97 | 25 | #define NETLINK_GENERIC 16 |
ead2ba70 SH |
26 | /* leave room for NETLINK_DM (DM Events) */ |
27 | #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */ | |
de3d12f4 | 28 | #define NETLINK_ECRYPTFS 19 |
e760a19a | 29 | #define NETLINK_RDMA 20 |
9044a454 | 30 | #define NETLINK_CRYPTO 21 /* Crypto layer */ |
e2ade8ce | 31 | #define NETLINK_SMC 22 /* SMC monitoring */ |
0633baa1 | 32 | |
a08d2590 SH |
33 | #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG |
34 | ||
0633baa1 SH |
35 | #define MAX_LINKS 32 |
36 | ||
ab322673 | 37 | struct sockaddr_nl { |
707f612c | 38 | __kernel_sa_family_t nl_family; /* AF_NETLINK */ |
0633baa1 | 39 | unsigned short nl_pad; /* zero */ |
de3d12f4 | 40 | __u32 nl_pid; /* port ID */ |
0633baa1 SH |
41 | __u32 nl_groups; /* multicast groups mask */ |
42 | }; | |
43 | ||
ab322673 | 44 | struct nlmsghdr { |
0633baa1 SH |
45 | __u32 nlmsg_len; /* Length of message including header */ |
46 | __u16 nlmsg_type; /* Message content */ | |
47 | __u16 nlmsg_flags; /* Additional flags */ | |
48 | __u32 nlmsg_seq; /* Sequence number */ | |
de3d12f4 | 49 | __u32 nlmsg_pid; /* Sending process port ID */ |
0633baa1 SH |
50 | }; |
51 | ||
52 | /* Flags values */ | |
53 | ||
2c6a0636 SH |
54 | #define NLM_F_REQUEST 0x01 /* It is request message. */ |
55 | #define NLM_F_MULTI 0x02 /* Multipart message, terminated by NLMSG_DONE */ | |
56 | #define NLM_F_ACK 0x04 /* Reply with ack, with zero or error code */ | |
57 | #define NLM_F_ECHO 0x08 /* Echo this request */ | |
58 | #define NLM_F_DUMP_INTR 0x10 /* Dump was inconsistent due to sequence change */ | |
59 | #define NLM_F_DUMP_FILTERED 0x20 /* Dump was filtered as requested */ | |
0633baa1 SH |
60 | |
61 | /* Modifiers to GET request */ | |
62 | #define NLM_F_ROOT 0x100 /* specify tree root */ | |
63 | #define NLM_F_MATCH 0x200 /* return all matching */ | |
64 | #define NLM_F_ATOMIC 0x400 /* atomic GET */ | |
65 | #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) | |
66 | ||
67 | /* Modifiers to NEW request */ | |
68 | #define NLM_F_REPLACE 0x100 /* Override existing */ | |
69 | #define NLM_F_EXCL 0x200 /* Do not touch, if it exists */ | |
70 | #define NLM_F_CREATE 0x400 /* Create, if it does not exist */ | |
71 | #define NLM_F_APPEND 0x800 /* Add to end of list */ | |
72 | ||
4a5b3035 SH |
73 | /* Modifiers to DELETE request */ |
74 | #define NLM_F_NONREC 0x100 /* Do not delete recursively */ | |
75 | ||
2c6a0636 SH |
76 | /* Flags for ACK message */ |
77 | #define NLM_F_CAPPED 0x100 /* request was capped */ | |
78 | #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */ | |
79 | ||
0633baa1 SH |
80 | /* |
81 | 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL | |
82 | 4.4BSD CHANGE NLM_F_REPLACE | |
83 | ||
84 | True CHANGE NLM_F_CREATE|NLM_F_REPLACE | |
85 | Append NLM_F_CREATE | |
86 | Check NLM_F_EXCL | |
87 | */ | |
88 | ||
8552b387 | 89 | #define NLMSG_ALIGNTO 4U |
0633baa1 | 90 | #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) ) |
09954dc6 | 91 | #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr))) |
79e9a1db | 92 | #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN) |
0633baa1 SH |
93 | #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len)) |
94 | #define NLMSG_DATA(nlh) ((void*)(((char*)nlh) + NLMSG_LENGTH(0))) | |
95 | #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \ | |
96 | (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len))) | |
97 | #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \ | |
98 | (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \ | |
99 | (nlh)->nlmsg_len <= (len)) | |
100 | #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len))) | |
101 | ||
102 | #define NLMSG_NOOP 0x1 /* Nothing. */ | |
103 | #define NLMSG_ERROR 0x2 /* Error */ | |
104 | #define NLMSG_DONE 0x3 /* End of a dump */ | |
105 | #define NLMSG_OVERRUN 0x4 /* Data lost */ | |
106 | ||
09954dc6 SH |
107 | #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */ |
108 | ||
ab322673 | 109 | struct nlmsgerr { |
0633baa1 SH |
110 | int error; |
111 | struct nlmsghdr msg; | |
2c6a0636 SH |
112 | /* |
113 | * followed by the message contents unless NETLINK_CAP_ACK was set | |
114 | * or the ACK indicates success (error == 0) | |
115 | * message length is aligned with NLMSG_ALIGN() | |
116 | */ | |
117 | /* | |
118 | * followed by TLVs defined in enum nlmsgerr_attrs | |
119 | * if NETLINK_EXT_ACK was set | |
120 | */ | |
121 | }; | |
122 | ||
123 | /** | |
124 | * enum nlmsgerr_attrs - nlmsgerr attributes | |
125 | * @NLMSGERR_ATTR_UNUSED: unused | |
126 | * @NLMSGERR_ATTR_MSG: error message string (string) | |
127 | * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original | |
128 | * message, counting from the beginning of the header (u32) | |
129 | * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to | |
130 | * be used - in the success case - to identify a created | |
131 | * object or operation or similar (binary) | |
f905191a | 132 | * @NLMSGERR_ATTR_POLICY: policy for a rejected attribute |
2c6a0636 SH |
133 | * @__NLMSGERR_ATTR_MAX: number of attributes |
134 | * @NLMSGERR_ATTR_MAX: highest attribute number | |
135 | */ | |
136 | enum nlmsgerr_attrs { | |
137 | NLMSGERR_ATTR_UNUSED, | |
138 | NLMSGERR_ATTR_MSG, | |
139 | NLMSGERR_ATTR_OFFS, | |
140 | NLMSGERR_ATTR_COOKIE, | |
f905191a | 141 | NLMSGERR_ATTR_POLICY, |
2c6a0636 SH |
142 | |
143 | __NLMSGERR_ATTR_MAX, | |
144 | NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 | |
0633baa1 SH |
145 | }; |
146 | ||
ff631c3a SH |
147 | #define NETLINK_ADD_MEMBERSHIP 1 |
148 | #define NETLINK_DROP_MEMBERSHIP 2 | |
149 | #define NETLINK_PKTINFO 3 | |
150 | #define NETLINK_BROADCAST_ERROR 4 | |
151 | #define NETLINK_NO_ENOBUFS 5 | |
152 | #define NETLINK_RX_RING 6 | |
153 | #define NETLINK_TX_RING 7 | |
154 | #define NETLINK_LISTEN_ALL_NSID 8 | |
155 | #define NETLINK_LIST_MEMBERSHIPS 9 | |
8d62f3e2 | 156 | #define NETLINK_CAP_ACK 10 |
2c6a0636 | 157 | #define NETLINK_EXT_ACK 11 |
fdce94d0 | 158 | #define NETLINK_GET_STRICT_CHK 12 |
351efcde | 159 | |
ab322673 | 160 | struct nl_pktinfo { |
351efcde SH |
161 | __u32 group; |
162 | }; | |
163 | ||
79e9a1db SH |
164 | struct nl_mmap_req { |
165 | unsigned int nm_block_size; | |
166 | unsigned int nm_block_nr; | |
167 | unsigned int nm_frame_size; | |
168 | unsigned int nm_frame_nr; | |
169 | }; | |
170 | ||
171 | struct nl_mmap_hdr { | |
172 | unsigned int nm_status; | |
173 | unsigned int nm_len; | |
174 | __u32 nm_group; | |
175 | /* credentials */ | |
176 | __u32 nm_pid; | |
177 | __u32 nm_uid; | |
178 | __u32 nm_gid; | |
179 | }; | |
180 | ||
181 | enum nl_mmap_status { | |
182 | NL_MMAP_STATUS_UNUSED, | |
183 | NL_MMAP_STATUS_RESERVED, | |
184 | NL_MMAP_STATUS_VALID, | |
185 | NL_MMAP_STATUS_COPY, | |
186 | NL_MMAP_STATUS_SKIP, | |
187 | }; | |
188 | ||
189 | #define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO | |
190 | #define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT) | |
191 | #define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr)) | |
192 | ||
0633baa1 SH |
193 | #define NET_MAJOR 36 /* Major 36 is reserved for networking */ |
194 | ||
195 | enum { | |
196 | NETLINK_UNCONNECTED = 0, | |
197 | NETLINK_CONNECTED, | |
198 | }; | |
199 | ||
09954dc6 SH |
200 | /* |
201 | * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)--> | |
202 | * +---------------------+- - -+- - - - - - - - - -+- - -+ | |
203 | * | Header | Pad | Payload | Pad | | |
204 | * | (struct nlattr) | ing | | ing | | |
205 | * +---------------------+- - -+- - - - - - - - - -+- - -+ | |
206 | * <-------------- nlattr->nla_len --------------> | |
207 | */ | |
208 | ||
ab322673 | 209 | struct nlattr { |
09954dc6 SH |
210 | __u16 nla_len; |
211 | __u16 nla_type; | |
212 | }; | |
213 | ||
5472ac6f SH |
214 | /* |
215 | * nla_type (16 bits) | |
216 | * +---+---+-------------------------------+ | |
217 | * | N | O | Attribute Type | | |
218 | * +---+---+-------------------------------+ | |
219 | * N := Carries nested attributes | |
220 | * O := Payload stored in network byte order | |
221 | * | |
222 | * Note: The N and O flag are mutually exclusive. | |
223 | */ | |
224 | #define NLA_F_NESTED (1 << 15) | |
225 | #define NLA_F_NET_BYTEORDER (1 << 14) | |
226 | #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER) | |
227 | ||
09954dc6 SH |
228 | #define NLA_ALIGNTO 4 |
229 | #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1)) | |
230 | #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr))) | |
231 | ||
72e4ea5e SH |
232 | /* Generic 32 bitflags attribute content sent to the kernel. |
233 | * | |
234 | * The value is a bitmap that defines the values being set | |
235 | * The selector is a bitmask that defines which value is legit | |
236 | * | |
237 | * Examples: | |
238 | * value = 0x0, and selector = 0x1 | |
239 | * implies we are selecting bit 1 and we want to set its value to 0. | |
240 | * | |
241 | * value = 0x2, and selector = 0x2 | |
242 | * implies we are selecting bit 2 and we want to set its value to 1. | |
243 | * | |
244 | */ | |
245 | struct nla_bitfield32 { | |
246 | __u32 value; | |
247 | __u32 selector; | |
248 | }; | |
0633baa1 | 249 | |
ae57e82d DA |
250 | /* |
251 | * policy descriptions - it's specific to each family how this is used | |
252 | * Normally, it should be retrieved via a dump inside another attribute | |
253 | * specifying where it applies. | |
254 | */ | |
255 | ||
256 | /** | |
257 | * enum netlink_attribute_type - type of an attribute | |
258 | * @NL_ATTR_TYPE_INVALID: unused | |
259 | * @NL_ATTR_TYPE_FLAG: flag attribute (present/not present) | |
260 | * @NL_ATTR_TYPE_U8: 8-bit unsigned attribute | |
261 | * @NL_ATTR_TYPE_U16: 16-bit unsigned attribute | |
262 | * @NL_ATTR_TYPE_U32: 32-bit unsigned attribute | |
263 | * @NL_ATTR_TYPE_U64: 64-bit unsigned attribute | |
264 | * @NL_ATTR_TYPE_S8: 8-bit signed attribute | |
265 | * @NL_ATTR_TYPE_S16: 16-bit signed attribute | |
266 | * @NL_ATTR_TYPE_S32: 32-bit signed attribute | |
267 | * @NL_ATTR_TYPE_S64: 64-bit signed attribute | |
268 | * @NL_ATTR_TYPE_BINARY: binary data, min/max length may be specified | |
269 | * @NL_ATTR_TYPE_STRING: string, min/max length may be specified | |
270 | * @NL_ATTR_TYPE_NUL_STRING: NUL-terminated string, | |
271 | * min/max length may be specified | |
272 | * @NL_ATTR_TYPE_NESTED: nested, i.e. the content of this attribute | |
273 | * consists of sub-attributes. The nested policy and maxtype | |
274 | * inside may be specified. | |
275 | * @NL_ATTR_TYPE_NESTED_ARRAY: nested array, i.e. the content of this | |
276 | * attribute contains sub-attributes whose type is irrelevant | |
277 | * (just used to separate the array entries) and each such array | |
278 | * entry has attributes again, the policy for those inner ones | |
279 | * and the corresponding maxtype may be specified. | |
280 | * @NL_ATTR_TYPE_BITFIELD32: &struct nla_bitfield32 attribute | |
281 | */ | |
282 | enum netlink_attribute_type { | |
283 | NL_ATTR_TYPE_INVALID, | |
284 | ||
285 | NL_ATTR_TYPE_FLAG, | |
286 | ||
287 | NL_ATTR_TYPE_U8, | |
288 | NL_ATTR_TYPE_U16, | |
289 | NL_ATTR_TYPE_U32, | |
290 | NL_ATTR_TYPE_U64, | |
291 | ||
292 | NL_ATTR_TYPE_S8, | |
293 | NL_ATTR_TYPE_S16, | |
294 | NL_ATTR_TYPE_S32, | |
295 | NL_ATTR_TYPE_S64, | |
296 | ||
297 | NL_ATTR_TYPE_BINARY, | |
298 | NL_ATTR_TYPE_STRING, | |
299 | NL_ATTR_TYPE_NUL_STRING, | |
300 | ||
301 | NL_ATTR_TYPE_NESTED, | |
302 | NL_ATTR_TYPE_NESTED_ARRAY, | |
303 | ||
304 | NL_ATTR_TYPE_BITFIELD32, | |
305 | }; | |
306 | ||
307 | /** | |
308 | * enum netlink_policy_type_attr - policy type attributes | |
309 | * @NL_POLICY_TYPE_ATTR_UNSPEC: unused | |
310 | * @NL_POLICY_TYPE_ATTR_TYPE: type of the attribute, | |
311 | * &enum netlink_attribute_type (U32) | |
312 | * @NL_POLICY_TYPE_ATTR_MIN_VALUE_S: minimum value for signed | |
313 | * integers (S64) | |
314 | * @NL_POLICY_TYPE_ATTR_MAX_VALUE_S: maximum value for signed | |
315 | * integers (S64) | |
316 | * @NL_POLICY_TYPE_ATTR_MIN_VALUE_U: minimum value for unsigned | |
317 | * integers (U64) | |
318 | * @NL_POLICY_TYPE_ATTR_MAX_VALUE_U: maximum value for unsigned | |
319 | * integers (U64) | |
320 | * @NL_POLICY_TYPE_ATTR_MIN_LENGTH: minimum length for binary | |
321 | * attributes, no minimum if not given (U32) | |
322 | * @NL_POLICY_TYPE_ATTR_MAX_LENGTH: maximum length for binary | |
323 | * attributes, no maximum if not given (U32) | |
324 | * @NL_POLICY_TYPE_ATTR_POLICY_IDX: sub policy for nested and | |
325 | * nested array types (U32) | |
326 | * @NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE: maximum sub policy | |
327 | * attribute for nested and nested array types, this can | |
328 | * in theory be < the size of the policy pointed to by | |
329 | * the index, if limited inside the nesting (U32) | |
330 | * @NL_POLICY_TYPE_ATTR_BITFIELD32_MASK: valid mask for the | |
331 | * bitfield32 type (U32) | |
34be2d26 | 332 | * @NL_POLICY_TYPE_ATTR_MASK: mask of valid bits for unsigned integers (U64) |
ae57e82d DA |
333 | * @NL_POLICY_TYPE_ATTR_PAD: pad attribute for 64-bit alignment |
334 | */ | |
335 | enum netlink_policy_type_attr { | |
336 | NL_POLICY_TYPE_ATTR_UNSPEC, | |
337 | NL_POLICY_TYPE_ATTR_TYPE, | |
338 | NL_POLICY_TYPE_ATTR_MIN_VALUE_S, | |
339 | NL_POLICY_TYPE_ATTR_MAX_VALUE_S, | |
340 | NL_POLICY_TYPE_ATTR_MIN_VALUE_U, | |
341 | NL_POLICY_TYPE_ATTR_MAX_VALUE_U, | |
342 | NL_POLICY_TYPE_ATTR_MIN_LENGTH, | |
343 | NL_POLICY_TYPE_ATTR_MAX_LENGTH, | |
344 | NL_POLICY_TYPE_ATTR_POLICY_IDX, | |
345 | NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE, | |
346 | NL_POLICY_TYPE_ATTR_BITFIELD32_MASK, | |
347 | NL_POLICY_TYPE_ATTR_PAD, | |
34be2d26 | 348 | NL_POLICY_TYPE_ATTR_MASK, |
ae57e82d DA |
349 | |
350 | /* keep last */ | |
351 | __NL_POLICY_TYPE_ATTR_MAX, | |
352 | NL_POLICY_TYPE_ATTR_MAX = __NL_POLICY_TYPE_ATTR_MAX - 1 | |
353 | }; | |
354 | ||
910773dc | 355 | #endif /* __LINUX_NETLINK_H */ |