1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef _UAPI__LINUX_NETLINK_H
3 #define _UAPI__LINUX_NETLINK_H
5 #include <linux/const.h>
6 #include <linux/socket.h> /* for __kernel_sa_family_t */
7 #include <linux/types.h>
9 #define NETLINK_ROUTE 0 /* Routing/device hook */
10 #define NETLINK_UNUSED 1 /* Unused number */
11 #define NETLINK_USERSOCK 2 /* Reserved for user mode socket protocols */
12 #define NETLINK_FIREWALL 3 /* Unused number, formerly ip_queue */
13 #define NETLINK_SOCK_DIAG 4 /* socket monitoring */
14 #define NETLINK_NFLOG 5 /* netfilter/iptables ULOG */
15 #define NETLINK_XFRM 6 /* ipsec */
16 #define NETLINK_SELINUX 7 /* SELinux event notifications */
17 #define NETLINK_ISCSI 8 /* Open-iSCSI */
18 #define NETLINK_AUDIT 9 /* auditing */
19 #define NETLINK_FIB_LOOKUP 10
20 #define NETLINK_CONNECTOR 11
21 #define NETLINK_NETFILTER 12 /* netfilter subsystem */
22 #define NETLINK_IP6_FW 13
23 #define NETLINK_DNRTMSG 14 /* DECnet routing messages */
24 #define NETLINK_KOBJECT_UEVENT 15 /* Kernel messages to userspace */
25 #define NETLINK_GENERIC 16
26 /* leave room for NETLINK_DM (DM Events) */
27 #define NETLINK_SCSITRANSPORT 18 /* SCSI Transports */
28 #define NETLINK_ECRYPTFS 19
29 #define NETLINK_RDMA 20
30 #define NETLINK_CRYPTO 21 /* Crypto layer */
31 #define NETLINK_SMC 22 /* SMC monitoring */
33 #define NETLINK_INET_DIAG NETLINK_SOCK_DIAG
38 __kernel_sa_family_t nl_family; /* AF_NETLINK */
39 unsigned short nl_pad; /* zero */
40 __u32 nl_pid; /* port ID */
41 __u32 nl_groups; /* multicast groups mask */
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 */
49 __u32 nlmsg_pid; /* Sending process port ID */
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 */
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)
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 */
73 /* Modifiers to DELETE request */
74 #define NLM_F_NONREC 0x100 /* Do not delete recursively */
75 #define NLM_F_BULK 0x200 /* Delete multiple objects */
77 /* Flags for ACK message */
78 #define NLM_F_CAPPED 0x100 /* request was capped */
79 #define NLM_F_ACK_TLVS 0x200 /* extended ACK TVLs were included */
82 4.4BSD ADD NLM_F_CREATE|NLM_F_EXCL
83 4.4BSD CHANGE NLM_F_REPLACE
85 True CHANGE NLM_F_CREATE|NLM_F_REPLACE
90 #define NLMSG_ALIGNTO 4U
91 #define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
92 #define NLMSG_HDRLEN ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
93 #define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
94 #define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
95 #define NLMSG_DATA(nlh) ((void *)(((char *)nlh) + NLMSG_HDRLEN))
96 #define NLMSG_NEXT(nlh,len) ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
97 (struct nlmsghdr *)(((char *)(nlh)) + \
98 NLMSG_ALIGN((nlh)->nlmsg_len)))
99 #define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
100 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
101 (nlh)->nlmsg_len <= (len))
102 #define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))
104 #define NLMSG_NOOP 0x1 /* Nothing. */
105 #define NLMSG_ERROR 0x2 /* Error */
106 #define NLMSG_DONE 0x3 /* End of a dump */
107 #define NLMSG_OVERRUN 0x4 /* Data lost */
109 #define NLMSG_MIN_TYPE 0x10 /* < 0x10: reserved control messages */
115 * followed by the message contents unless NETLINK_CAP_ACK was set
116 * or the ACK indicates success (error == 0)
117 * message length is aligned with NLMSG_ALIGN()
120 * followed by TLVs defined in enum nlmsgerr_attrs
121 * if NETLINK_EXT_ACK was set
126 * enum nlmsgerr_attrs - nlmsgerr attributes
127 * @NLMSGERR_ATTR_UNUSED: unused
128 * @NLMSGERR_ATTR_MSG: error message string (string)
129 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
130 * message, counting from the beginning of the header (u32)
131 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to
132 * be used - in the success case - to identify a created
133 * object or operation or similar (binary)
134 * @NLMSGERR_ATTR_POLICY: policy for a rejected attribute
135 * @__NLMSGERR_ATTR_MAX: number of attributes
136 * @NLMSGERR_ATTR_MAX: highest attribute number
138 enum nlmsgerr_attrs {
139 NLMSGERR_ATTR_UNUSED,
142 NLMSGERR_ATTR_COOKIE,
143 NLMSGERR_ATTR_POLICY,
146 NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
149 #define NETLINK_ADD_MEMBERSHIP 1
150 #define NETLINK_DROP_MEMBERSHIP 2
151 #define NETLINK_PKTINFO 3
152 #define NETLINK_BROADCAST_ERROR 4
153 #define NETLINK_NO_ENOBUFS 5
155 #define NETLINK_RX_RING 6
156 #define NETLINK_TX_RING 7
158 #define NETLINK_LISTEN_ALL_NSID 8
159 #define NETLINK_LIST_MEMBERSHIPS 9
160 #define NETLINK_CAP_ACK 10
161 #define NETLINK_EXT_ACK 11
162 #define NETLINK_GET_STRICT_CHK 12
169 unsigned int nm_block_size;
170 unsigned int nm_block_nr;
171 unsigned int nm_frame_size;
172 unsigned int nm_frame_nr;
176 unsigned int nm_status;
186 enum nl_mmap_status {
187 NL_MMAP_STATUS_UNUSED,
188 NL_MMAP_STATUS_RESERVED,
189 NL_MMAP_STATUS_VALID,
194 #define NL_MMAP_MSG_ALIGNMENT NLMSG_ALIGNTO
195 #define NL_MMAP_MSG_ALIGN(sz) __ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
196 #define NL_MMAP_HDRLEN NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
199 #define NET_MAJOR 36 /* Major 36 is reserved for networking */
202 NETLINK_UNCONNECTED = 0,
207 * <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
208 * +---------------------+- - -+- - - - - - - - - -+- - -+
209 * | Header | Pad | Payload | Pad |
210 * | (struct nlattr) | ing | | ing |
211 * +---------------------+- - -+- - - - - - - - - -+- - -+
212 * <-------------- nlattr->nla_len -------------->
222 * +---+---+-------------------------------+
223 * | N | O | Attribute Type |
224 * +---+---+-------------------------------+
225 * N := Carries nested attributes
226 * O := Payload stored in network byte order
228 * Note: The N and O flag are mutually exclusive.
230 #define NLA_F_NESTED (1 << 15)
231 #define NLA_F_NET_BYTEORDER (1 << 14)
232 #define NLA_TYPE_MASK ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
234 #define NLA_ALIGNTO 4
235 #define NLA_ALIGN(len) (((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
236 #define NLA_HDRLEN ((int) NLA_ALIGN(sizeof(struct nlattr)))
238 /* Generic 32 bitflags attribute content sent to the kernel.
240 * The value is a bitmap that defines the values being set
241 * The selector is a bitmask that defines which value is legit
244 * value = 0x0, and selector = 0x1
245 * implies we are selecting bit 1 and we want to set its value to 0.
247 * value = 0x2, and selector = 0x2
248 * implies we are selecting bit 2 and we want to set its value to 1.
251 struct nla_bitfield32 {
257 * policy descriptions - it's specific to each family how this is used
258 * Normally, it should be retrieved via a dump inside another attribute
259 * specifying where it applies.
263 * enum netlink_attribute_type - type of an attribute
264 * @NL_ATTR_TYPE_INVALID: unused
265 * @NL_ATTR_TYPE_FLAG: flag attribute (present/not present)
266 * @NL_ATTR_TYPE_U8: 8-bit unsigned attribute
267 * @NL_ATTR_TYPE_U16: 16-bit unsigned attribute
268 * @NL_ATTR_TYPE_U32: 32-bit unsigned attribute
269 * @NL_ATTR_TYPE_U64: 64-bit unsigned attribute
270 * @NL_ATTR_TYPE_S8: 8-bit signed attribute
271 * @NL_ATTR_TYPE_S16: 16-bit signed attribute
272 * @NL_ATTR_TYPE_S32: 32-bit signed attribute
273 * @NL_ATTR_TYPE_S64: 64-bit signed attribute
274 * @NL_ATTR_TYPE_BINARY: binary data, min/max length may be specified
275 * @NL_ATTR_TYPE_STRING: string, min/max length may be specified
276 * @NL_ATTR_TYPE_NUL_STRING: NUL-terminated string,
277 * min/max length may be specified
278 * @NL_ATTR_TYPE_NESTED: nested, i.e. the content of this attribute
279 * consists of sub-attributes. The nested policy and maxtype
280 * inside may be specified.
281 * @NL_ATTR_TYPE_NESTED_ARRAY: nested array, i.e. the content of this
282 * attribute contains sub-attributes whose type is irrelevant
283 * (just used to separate the array entries) and each such array
284 * entry has attributes again, the policy for those inner ones
285 * and the corresponding maxtype may be specified.
286 * @NL_ATTR_TYPE_BITFIELD32: &struct nla_bitfield32 attribute
288 enum netlink_attribute_type {
289 NL_ATTR_TYPE_INVALID,
305 NL_ATTR_TYPE_NUL_STRING,
308 NL_ATTR_TYPE_NESTED_ARRAY,
310 NL_ATTR_TYPE_BITFIELD32,
314 * enum netlink_policy_type_attr - policy type attributes
315 * @NL_POLICY_TYPE_ATTR_UNSPEC: unused
316 * @NL_POLICY_TYPE_ATTR_TYPE: type of the attribute,
317 * &enum netlink_attribute_type (U32)
318 * @NL_POLICY_TYPE_ATTR_MIN_VALUE_S: minimum value for signed
320 * @NL_POLICY_TYPE_ATTR_MAX_VALUE_S: maximum value for signed
322 * @NL_POLICY_TYPE_ATTR_MIN_VALUE_U: minimum value for unsigned
324 * @NL_POLICY_TYPE_ATTR_MAX_VALUE_U: maximum value for unsigned
326 * @NL_POLICY_TYPE_ATTR_MIN_LENGTH: minimum length for binary
327 * attributes, no minimum if not given (U32)
328 * @NL_POLICY_TYPE_ATTR_MAX_LENGTH: maximum length for binary
329 * attributes, no maximum if not given (U32)
330 * @NL_POLICY_TYPE_ATTR_POLICY_IDX: sub policy for nested and
331 * nested array types (U32)
332 * @NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE: maximum sub policy
333 * attribute for nested and nested array types, this can
334 * in theory be < the size of the policy pointed to by
335 * the index, if limited inside the nesting (U32)
336 * @NL_POLICY_TYPE_ATTR_BITFIELD32_MASK: valid mask for the
337 * bitfield32 type (U32)
338 * @NL_POLICY_TYPE_ATTR_MASK: mask of valid bits for unsigned integers (U64)
339 * @NL_POLICY_TYPE_ATTR_PAD: pad attribute for 64-bit alignment
341 enum netlink_policy_type_attr {
342 NL_POLICY_TYPE_ATTR_UNSPEC,
343 NL_POLICY_TYPE_ATTR_TYPE,
344 NL_POLICY_TYPE_ATTR_MIN_VALUE_S,
345 NL_POLICY_TYPE_ATTR_MAX_VALUE_S,
346 NL_POLICY_TYPE_ATTR_MIN_VALUE_U,
347 NL_POLICY_TYPE_ATTR_MAX_VALUE_U,
348 NL_POLICY_TYPE_ATTR_MIN_LENGTH,
349 NL_POLICY_TYPE_ATTR_MAX_LENGTH,
350 NL_POLICY_TYPE_ATTR_POLICY_IDX,
351 NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE,
352 NL_POLICY_TYPE_ATTR_BITFIELD32_MASK,
353 NL_POLICY_TYPE_ATTR_PAD,
354 NL_POLICY_TYPE_ATTR_MASK,
357 __NL_POLICY_TYPE_ATTR_MAX,
358 NL_POLICY_TYPE_ATTR_MAX = __NL_POLICY_TYPE_ATTR_MAX - 1
361 #endif /* _UAPI__LINUX_NETLINK_H */