summaryrefslogtreecommitdiff
path: root/include/uapi/linux/netlink.h
blob: 3d94269bbfa87c2608725e1b553b4ec4ddf55438 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI__LINUX_NETLINK_H
#define _UAPI__LINUX_NETLINK_H

#include <linux/const.h>
#include <linux/socket.h> /* for __kernel_sa_family_t */
#include <linux/types.h>

#define NETLINK_ROUTE		0	/* Routing/device hook				*/
#define NETLINK_UNUSED		1	/* Unused number				*/
#define NETLINK_USERSOCK	2	/* Reserved for user mode socket protocols 	*/
#define NETLINK_FIREWALL	3	/* Unused number, formerly ip_queue		*/
#define NETLINK_SOCK_DIAG	4	/* socket monitoring				*/
#define NETLINK_NFLOG		5	/* netfilter/iptables ULOG */
#define NETLINK_XFRM		6	/* ipsec */
#define NETLINK_SELINUX		7	/* SELinux event notifications */
#define NETLINK_ISCSI		8	/* Open-iSCSI */
#define NETLINK_AUDIT		9	/* auditing */
#define NETLINK_FIB_LOOKUP	10	
#define NETLINK_CONNECTOR	11
#define NETLINK_NETFILTER	12	/* netfilter subsystem */
#define NETLINK_IP6_FW		13
#define NETLINK_DNRTMSG		14	/* DECnet routing messages */
#define NETLINK_KOBJECT_UEVENT	15	/* Kernel messages to userspace */
#define NETLINK_GENERIC		16
/* leave room for NETLINK_DM (DM Events) */
#define NETLINK_SCSITRANSPORT	18	/* SCSI Transports */
#define NETLINK_ECRYPTFS	19
#define NETLINK_RDMA		20
#define NETLINK_CRYPTO		21	/* Crypto layer */
#define NETLINK_SMC		22	/* SMC monitoring */

#define NETLINK_INET_DIAG	NETLINK_SOCK_DIAG

#define MAX_LINKS 32		

struct sockaddr_nl {
	__kernel_sa_family_t	nl_family;	/* AF_NETLINK	*/
	unsigned short	nl_pad;		/* zero		*/
	__u32		nl_pid;		/* port ID	*/
       	__u32		nl_groups;	/* multicast groups mask */
};

struct nlmsghdr {
	__u32		nlmsg_len;	/* Length of message including header */
	__u16		nlmsg_type;	/* Message content */
	__u16		nlmsg_flags;	/* Additional flags */
	__u32		nlmsg_seq;	/* Sequence number */
	__u32		nlmsg_pid;	/* Sending process port ID */
};

/* Flags values */

#define NLM_F_REQUEST		0x01	/* It is request message. 	*/
#define NLM_F_MULTI		0x02	/* Multipart message, terminated by NLMSG_DONE */
#define NLM_F_ACK		0x04	/* Reply with ack, with zero or error code */
#define NLM_F_ECHO		0x08	/* Echo this request 		*/
#define NLM_F_DUMP_INTR		0x10	/* Dump was inconsistent due to sequence change */
#define NLM_F_DUMP_FILTERED	0x20	/* Dump was filtered as requested */

/* Modifiers to GET request */
#define NLM_F_ROOT	0x100	/* specify tree	root	*/
#define NLM_F_MATCH	0x200	/* return all matching	*/
#define NLM_F_ATOMIC	0x400	/* atomic GET		*/
#define NLM_F_DUMP	(NLM_F_ROOT|NLM_F_MATCH)

/* Modifiers to NEW request */
#define NLM_F_REPLACE	0x100	/* Override existing		*/
#define NLM_F_EXCL	0x200	/* Do not touch, if it 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 request */
#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 */

/*
   4.4BSD ADD		NLM_F_CREATE|NLM_F_EXCL
   4.4BSD CHANGE	NLM_F_REPLACE

   True CHANGE		NLM_F_CREATE|NLM_F_REPLACE
   Append		NLM_F_CREATE
   Check		NLM_F_EXCL
 */

#define NLMSG_ALIGNTO	4U
#define NLMSG_ALIGN(len) ( ((len)+NLMSG_ALIGNTO-1) & ~(NLMSG_ALIGNTO-1) )
#define NLMSG_HDRLEN	 ((int) NLMSG_ALIGN(sizeof(struct nlmsghdr)))
#define NLMSG_LENGTH(len) ((len) + NLMSG_HDRLEN)
#define NLMSG_SPACE(len) NLMSG_ALIGN(NLMSG_LENGTH(len))
#define NLMSG_DATA(nlh)  ((void*)(((char*)nlh) + NLMSG_LENGTH(0)))
#define NLMSG_NEXT(nlh,len)	 ((len) -= NLMSG_ALIGN((nlh)->nlmsg_len), \
				  (struct nlmsghdr*)(((char*)(nlh)) + NLMSG_ALIGN((nlh)->nlmsg_len)))
#define NLMSG_OK(nlh,len) ((len) >= (int)sizeof(struct nlmsghdr) && \
			   (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
			   (nlh)->nlmsg_len <= (len))
#define NLMSG_PAYLOAD(nlh,len) ((nlh)->nlmsg_len - NLMSG_SPACE((len)))

#define NLMSG_NOOP		0x1	/* Nothing.		*/
#define NLMSG_ERROR		0x2	/* Error		*/
#define NLMSG_DONE		0x3	/* End of a dump	*/
#define NLMSG_OVERRUN		0x4	/* Data lost		*/

#define NLMSG_MIN_TYPE		0x10	/* < 0x10: reserved control messages */

struct nlmsgerr {
	int		error;
	struct nlmsghdr msg;
	/*
	 * followed by the message contents unless NETLINK_CAP_ACK was set
	 * or the ACK indicates success (error == 0)
	 * message length is aligned with NLMSG_ALIGN()
	 */
	/*
	 * followed by TLVs defined in enum nlmsgerr_attrs
	 * if NETLINK_EXT_ACK was set
	 */
};

/**
 * enum nlmsgerr_attrs - nlmsgerr attributes
 * @NLMSGERR_ATTR_UNUSED: unused
 * @NLMSGERR_ATTR_MSG: error message string (string)
 * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
 *	 message, counting from the beginning of the header (u32)
 * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to
 *	be used - in the success case - to identify a created
 *	object or operation or similar (binary)
 * @NLMSGERR_ATTR_POLICY: policy for a rejected attribute
 * @__NLMSGERR_ATTR_MAX: number of attributes
 * @NLMSGERR_ATTR_MAX: highest attribute number
 */
enum nlmsgerr_attrs {
	NLMSGERR_ATTR_UNUSED,
	NLMSGERR_ATTR_MSG,
	NLMSGERR_ATTR_OFFS,
	NLMSGERR_ATTR_COOKIE,
	NLMSGERR_ATTR_POLICY,

	__NLMSGERR_ATTR_MAX,
	NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
};

#define NETLINK_ADD_MEMBERSHIP		1
#define NETLINK_DROP_MEMBERSHIP		2
#define NETLINK_PKTINFO			3
#define NETLINK_BROADCAST_ERROR		4
#define NETLINK_NO_ENOBUFS		5
#ifndef __KERNEL__
#define NETLINK_RX_RING			6
#define NETLINK_TX_RING			7
#endif
#define NETLINK_LISTEN_ALL_NSID		8
#define NETLINK_LIST_MEMBERSHIPS	9
#define NETLINK_CAP_ACK			10
#define NETLINK_EXT_ACK			11
#define NETLINK_GET_STRICT_CHK		12

struct nl_pktinfo {
	__u32	group;
};

struct nl_mmap_req {
	unsigned int	nm_block_size;
	unsigned int	nm_block_nr;
	unsigned int	nm_frame_size;
	unsigned int	nm_frame_nr;
};

struct nl_mmap_hdr {
	unsigned int	nm_status;
	unsigned int	nm_len;
	__u32		nm_group;
	/* credentials */
	__u32		nm_pid;
	__u32		nm_uid;
	__u32		nm_gid;
};

#ifndef __KERNEL__
enum nl_mmap_status {
	NL_MMAP_STATUS_UNUSED,
	NL_MMAP_STATUS_RESERVED,
	NL_MMAP_STATUS_VALID,
	NL_MMAP_STATUS_COPY,
	NL_MMAP_STATUS_SKIP,
};

#define NL_MMAP_MSG_ALIGNMENT		NLMSG_ALIGNTO
#define NL_MMAP_MSG_ALIGN(sz)		__ALIGN_KERNEL(sz, NL_MMAP_MSG_ALIGNMENT)
#define NL_MMAP_HDRLEN			NL_MMAP_MSG_ALIGN(sizeof(struct nl_mmap_hdr))
#endif

#define NET_MAJOR 36		/* Major 36 is reserved for networking 						*/

enum {
	NETLINK_UNCONNECTED = 0,
	NETLINK_CONNECTED,
};

/*
 *  <------- NLA_HDRLEN ------> <-- NLA_ALIGN(payload)-->
 * +---------------------+- - -+- - - - - - - - - -+- - -+
 * |        Header       | Pad |     Payload       | Pad |
 * |   (struct nlattr)   | ing |                   | ing |
 * +---------------------+- - -+- - - - - - - - - -+- - -+
 *  <-------------- nlattr->nla_len -------------->
 */

struct nlattr {
	__u16           nla_len;
	__u16           nla_type;
};

/*
 * nla_type (16 bits)
 * +---+---+-------------------------------+
 * | N | O | Attribute Type                |
 * +---+---+-------------------------------+
 * N := Carries nested attributes
 * O := Payload stored in network byte order
 *
 * Note: The N and O flag are mutually exclusive.
 */
#define NLA_F_NESTED		(1 << 15)
#define NLA_F_NET_BYTEORDER	(1 << 14)
#define NLA_TYPE_MASK		~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)

#define NLA_ALIGNTO		4
#define NLA_ALIGN(len)		(((len) + NLA_ALIGNTO - 1) & ~(NLA_ALIGNTO - 1))
#define NLA_HDRLEN		((int) NLA_ALIGN(sizeof(struct nlattr)))

/* Generic 32 bitflags attribute content sent to the kernel.
 *
 * The value is a bitmap that defines the values being set
 * The selector is a bitmask that defines which value is legit
 *
 * Examples:
 *  value = 0x0, and selector = 0x1
 *  implies we are selecting bit 1 and we want to set its value to 0.
 *
 *  value = 0x2, and selector = 0x2
 *  implies we are selecting bit 2 and we want to set its value to 1.
 *
 */
struct nla_bitfield32 {
	__u32 value;
	__u32 selector;
};

/*
 * policy descriptions - it's specific to each family how this is used
 * Normally, it should be retrieved via a dump inside another attribute
 * specifying where it applies.
 */

/**
 * enum netlink_attribute_type - type of an attribute
 * @NL_ATTR_TYPE_INVALID: unused
 * @NL_ATTR_TYPE_FLAG: flag attribute (present/not present)
 * @NL_ATTR_TYPE_U8: 8-bit unsigned attribute
 * @NL_ATTR_TYPE_U16: 16-bit unsigned attribute
 * @NL_ATTR_TYPE_U32: 32-bit unsigned attribute
 * @NL_ATTR_TYPE_U64: 64-bit unsigned attribute
 * @NL_ATTR_TYPE_S8: 8-bit signed attribute
 * @NL_ATTR_TYPE_S16: 16-bit signed attribute
 * @NL_ATTR_TYPE_S32: 32-bit signed attribute
 * @NL_ATTR_TYPE_S64: 64-bit signed attribute
 * @NL_ATTR_TYPE_BINARY: binary data, min/max length may be specified
 * @NL_ATTR_TYPE_STRING: string, min/max length may be specified
 * @NL_ATTR_TYPE_NUL_STRING: NUL-terminated string,
 *	min/max length may be specified
 * @NL_ATTR_TYPE_NESTED: nested, i.e. the content of this attribute
 *	consists of sub-attributes. The nested policy and maxtype
 *	inside may be specified.
 * @NL_ATTR_TYPE_NESTED_ARRAY: nested array, i.e. the content of this
 *	attribute contains sub-attributes whose type is irrelevant
 *	(just used to separate the array entries) and each such array
 *	entry has attributes again, the policy for those inner ones
 *	and the corresponding maxtype may be specified.
 * @NL_ATTR_TYPE_BITFIELD32: &struct nla_bitfield32 attribute
 */
enum netlink_attribute_type {
	NL_ATTR_TYPE_INVALID,

	NL_ATTR_TYPE_FLAG,

	NL_ATTR_TYPE_U8,
	NL_ATTR_TYPE_U16,
	NL_ATTR_TYPE_U32,
	NL_ATTR_TYPE_U64,

	NL_ATTR_TYPE_S8,
	NL_ATTR_TYPE_S16,
	NL_ATTR_TYPE_S32,
	NL_ATTR_TYPE_S64,

	NL_ATTR_TYPE_BINARY,
	NL_ATTR_TYPE_STRING,
	NL_ATTR_TYPE_NUL_STRING,

	NL_ATTR_TYPE_NESTED,
	NL_ATTR_TYPE_NESTED_ARRAY,

	NL_ATTR_TYPE_BITFIELD32,
};

/**
 * enum netlink_policy_type_attr - policy type attributes
 * @NL_POLICY_TYPE_ATTR_UNSPEC: unused
 * @NL_POLICY_TYPE_ATTR_TYPE: type of the attribute,
 *	&enum netlink_attribute_type (U32)
 * @NL_POLICY_TYPE_ATTR_MIN_VALUE_S: minimum value for signed
 *	integers (S64)
 * @NL_POLICY_TYPE_ATTR_MAX_VALUE_S: maximum value for signed
 *	integers (S64)
 * @NL_POLICY_TYPE_ATTR_MIN_VALUE_U: minimum value for unsigned
 *	integers (U64)
 * @NL_POLICY_TYPE_ATTR_MAX_VALUE_U: maximum value for unsigned
 *	integers (U64)
 * @NL_POLICY_TYPE_ATTR_MIN_LENGTH: minimum length for binary
 *	attributes, no minimum if not given (U32)
 * @NL_POLICY_TYPE_ATTR_MAX_LENGTH: maximum length for binary
 *	attributes, no maximum if not given (U32)
 * @NL_POLICY_TYPE_ATTR_POLICY_IDX: sub policy for nested and
 *	nested array types (U32)
 * @NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE: maximum sub policy
 *	attribute for nested and nested array types, this can
 *	in theory be < the size of the policy pointed to by
 *	the index, if limited inside the nesting (U32)
 * @NL_POLICY_TYPE_ATTR_BITFIELD32_MASK: valid mask for the
 *	bitfield32 type (U32)
 * @NL_POLICY_TYPE_ATTR_MASK: mask of valid bits for unsigned integers (U64)
 * @NL_POLICY_TYPE_ATTR_PAD: pad attribute for 64-bit alignment
 */
enum netlink_policy_type_attr {
	NL_POLICY_TYPE_ATTR_UNSPEC,
	NL_POLICY_TYPE_ATTR_TYPE,
	NL_POLICY_TYPE_ATTR_MIN_VALUE_S,
	NL_POLICY_TYPE_ATTR_MAX_VALUE_S,
	NL_POLICY_TYPE_ATTR_MIN_VALUE_U,
	NL_POLICY_TYPE_ATTR_MAX_VALUE_U,
	NL_POLICY_TYPE_ATTR_MIN_LENGTH,
	NL_POLICY_TYPE_ATTR_MAX_LENGTH,
	NL_POLICY_TYPE_ATTR_POLICY_IDX,
	NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE,
	NL_POLICY_TYPE_ATTR_BITFIELD32_MASK,
	NL_POLICY_TYPE_ATTR_PAD,
	NL_POLICY_TYPE_ATTR_MASK,

	/* keep last */
	__NL_POLICY_TYPE_ATTR_MAX,
	NL_POLICY_TYPE_ATTR_MAX = __NL_POLICY_TYPE_ATTR_MAX - 1
};

#endif /* _UAPI__LINUX_NETLINK_H */