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Thomas Grafbfa83a92005-11-10 02:25:51 +01001#ifndef __NET_NETLINK_H
2#define __NET_NETLINK_H
3
4#include <linux/types.h>
5#include <linux/netlink.h>
Al Virod7fe0f22006-12-03 23:15:30 -05006#include <linux/jiffies.h>
Jiri Benc930345e2015-03-29 16:59:25 +02007#include <linux/in6.h>
Thomas Grafbfa83a92005-11-10 02:25:51 +01008
9/* ========================================================================
10 * Netlink Messages and Attributes Interface (As Seen On TV)
11 * ------------------------------------------------------------------------
12 * Messages Interface
13 * ------------------------------------------------------------------------
14 *
15 * Message Format:
16 * <--- nlmsg_total_size(payload) --->
17 * <-- nlmsg_msg_size(payload) ->
18 * +----------+- - -+-------------+- - -+-------- - -
19 * | nlmsghdr | Pad | Payload | Pad | nlmsghdr
20 * +----------+- - -+-------------+- - -+-------- - -
21 * nlmsg_data(nlh)---^ ^
22 * nlmsg_next(nlh)-----------------------+
23 *
24 * Payload Format:
25 * <---------------------- nlmsg_len(nlh) --------------------->
26 * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) ->
27 * +----------------------+- - -+--------------------------------+
28 * | Family Header | Pad | Attributes |
29 * +----------------------+- - -+--------------------------------+
30 * nlmsg_attrdata(nlh, hdrlen)---^
31 *
32 * Data Structures:
33 * struct nlmsghdr netlink message header
34 *
35 * Message Construction:
36 * nlmsg_new() create a new netlink message
37 * nlmsg_put() add a netlink message to an skb
38 * nlmsg_put_answer() callback based nlmsg_put()
Justin P. Mattock1dc8d8c2010-06-21 13:45:42 -070039 * nlmsg_end() finalize netlink message
Thomas Graffe4944e2006-08-04 23:03:05 -070040 * nlmsg_get_pos() return current position in message
41 * nlmsg_trim() trim part of message
Thomas Grafbfa83a92005-11-10 02:25:51 +010042 * nlmsg_cancel() cancel message construction
43 * nlmsg_free() free a netlink message
44 *
45 * Message Sending:
46 * nlmsg_multicast() multicast message to several groups
47 * nlmsg_unicast() unicast a message to a single socket
Thomas Grafd387f6a2006-08-15 00:31:06 -070048 * nlmsg_notify() send notification message
Thomas Grafbfa83a92005-11-10 02:25:51 +010049 *
50 * Message Length Calculations:
51 * nlmsg_msg_size(payload) length of message w/o padding
52 * nlmsg_total_size(payload) length of message w/ padding
53 * nlmsg_padlen(payload) length of padding at tail
54 *
55 * Message Payload Access:
56 * nlmsg_data(nlh) head of message payload
57 * nlmsg_len(nlh) length of message payload
58 * nlmsg_attrdata(nlh, hdrlen) head of attributes data
59 * nlmsg_attrlen(nlh, hdrlen) length of attributes data
60 *
61 * Message Parsing:
62 * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes?
63 * nlmsg_next(nlh, remaining) get next netlink message
64 * nlmsg_parse() parse attributes of a message
65 * nlmsg_find_attr() find an attribute in a message
66 * nlmsg_for_each_msg() loop over all messages
67 * nlmsg_validate() validate netlink message incl. attrs
68 * nlmsg_for_each_attr() loop over all attributes
69 *
Thomas Graf97676b62006-08-15 00:31:41 -070070 * Misc:
71 * nlmsg_report() report back to application?
72 *
Thomas Grafbfa83a92005-11-10 02:25:51 +010073 * ------------------------------------------------------------------------
74 * Attributes Interface
75 * ------------------------------------------------------------------------
76 *
77 * Attribute Format:
78 * <------- nla_total_size(payload) ------->
79 * <---- nla_attr_size(payload) ----->
80 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
81 * | Header | Pad | Payload | Pad | Header
82 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
83 * <- nla_len(nla) -> ^
84 * nla_data(nla)----^ |
85 * nla_next(nla)-----------------------------'
86 *
87 * Data Structures:
Pierre Ynardd1ec3b72007-10-10 21:09:48 -070088 * struct nlattr netlink attribute header
Thomas Grafbfa83a92005-11-10 02:25:51 +010089 *
90 * Attribute Construction:
Thomas Graffe4944e2006-08-04 23:03:05 -070091 * nla_reserve(skb, type, len) reserve room for an attribute
92 * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr
Thomas Grafbfa83a92005-11-10 02:25:51 +010093 * nla_put(skb, type, len, data) add attribute to skb
Thomas Graffe4944e2006-08-04 23:03:05 -070094 * nla_put_nohdr(skb, len, data) add attribute w/o hdr
Patrick McHardy01480e12008-01-22 22:10:59 -080095 * nla_append(skb, len, data) append data to skb
Thomas Grafbfa83a92005-11-10 02:25:51 +010096 *
97 * Attribute Construction for Basic Types:
98 * nla_put_u8(skb, type, value) add u8 attribute to skb
99 * nla_put_u16(skb, type, value) add u16 attribute to skb
100 * nla_put_u32(skb, type, value) add u32 attribute to skb
101 * nla_put_u64(skb, type, value) add u64 attribute to skb
Jiri Pirko4778e0b2012-07-27 06:28:52 +0000102 * nla_put_s8(skb, type, value) add s8 attribute to skb
103 * nla_put_s16(skb, type, value) add s16 attribute to skb
104 * nla_put_s32(skb, type, value) add s32 attribute to skb
105 * nla_put_s64(skb, type, value) add s64 attribute to skb
Thomas Grafbfa83a92005-11-10 02:25:51 +0100106 * nla_put_string(skb, type, str) add string attribute to skb
107 * nla_put_flag(skb, type) add flag attribute to skb
108 * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb
Jiri Benc930345e2015-03-29 16:59:25 +0200109 * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb
110 * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb
Thomas Grafbfa83a92005-11-10 02:25:51 +0100111 *
Thomas Grafbfa83a92005-11-10 02:25:51 +0100112 * Nested Attributes Construction:
113 * nla_nest_start(skb, type) start a nested attribute
114 * nla_nest_end(skb, nla) finalize a nested attribute
115 * nla_nest_cancel(skb, nla) cancel nested attribute construction
116 *
117 * Attribute Length Calculations:
118 * nla_attr_size(payload) length of attribute w/o padding
119 * nla_total_size(payload) length of attribute w/ padding
120 * nla_padlen(payload) length of padding
121 *
122 * Attribute Payload Access:
123 * nla_data(nla) head of attribute payload
124 * nla_len(nla) length of attribute payload
125 *
126 * Attribute Payload Access for Basic Types:
127 * nla_get_u8(nla) get payload for a u8 attribute
128 * nla_get_u16(nla) get payload for a u16 attribute
129 * nla_get_u32(nla) get payload for a u32 attribute
130 * nla_get_u64(nla) get payload for a u64 attribute
Jiri Pirko4778e0b2012-07-27 06:28:52 +0000131 * nla_get_s8(nla) get payload for a s8 attribute
132 * nla_get_s16(nla) get payload for a s16 attribute
133 * nla_get_s32(nla) get payload for a s32 attribute
134 * nla_get_s64(nla) get payload for a s64 attribute
Thomas Grafbfa83a92005-11-10 02:25:51 +0100135 * nla_get_flag(nla) return 1 if flag is true
136 * nla_get_msecs(nla) get payload for a msecs attribute
137 *
138 * Attribute Misc:
139 * nla_memcpy(dest, nla, count) copy attribute into memory
140 * nla_memcmp(nla, data, size) compare attribute with memory area
141 * nla_strlcpy(dst, nla, size) copy attribute to a sized string
142 * nla_strcmp(nla, str) compare attribute with string
143 *
144 * Attribute Parsing:
145 * nla_ok(nla, remaining) does nla fit into remaining bytes?
146 * nla_next(nla, remaining) get next netlink attribute
147 * nla_validate() validate a stream of attributes
Paul Moore4fe5d5c2006-09-25 15:54:03 -0700148 * nla_validate_nested() validate a stream of nested attributes
Thomas Grafbfa83a92005-11-10 02:25:51 +0100149 * nla_find() find attribute in stream of attributes
Thomas Graffe4944e2006-08-04 23:03:05 -0700150 * nla_find_nested() find attribute in nested attributes
Thomas Grafbfa83a92005-11-10 02:25:51 +0100151 * nla_parse() parse and validate stream of attrs
152 * nla_parse_nested() parse nested attribuets
153 * nla_for_each_attr() loop over all attributes
Paul Moore22acb192006-09-25 15:53:37 -0700154 * nla_for_each_nested() loop over the nested attributes
Thomas Grafbfa83a92005-11-10 02:25:51 +0100155 *=========================================================================
156 */
157
158 /**
159 * Standard attribute types to specify validation policy
160 */
161enum {
162 NLA_UNSPEC,
163 NLA_U8,
164 NLA_U16,
165 NLA_U32,
166 NLA_U64,
167 NLA_STRING,
168 NLA_FLAG,
169 NLA_MSECS,
170 NLA_NESTED,
Patrick McHardy1092cb22007-06-25 13:49:35 -0700171 NLA_NESTED_COMPAT,
Thomas Grafa5531a52006-08-26 20:11:47 -0700172 NLA_NUL_STRING,
Johannes Bergd30045a2007-03-23 11:37:48 -0700173 NLA_BINARY,
Jiri Pirko4778e0b2012-07-27 06:28:52 +0000174 NLA_S8,
175 NLA_S16,
176 NLA_S32,
177 NLA_S64,
Thomas Grafbfa83a92005-11-10 02:25:51 +0100178 __NLA_TYPE_MAX,
179};
180
181#define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
182
183/**
184 * struct nla_policy - attribute validation policy
185 * @type: Type of attribute or NLA_UNSPEC
Thomas Grafa5531a52006-08-26 20:11:47 -0700186 * @len: Type specific length of payload
Thomas Grafbfa83a92005-11-10 02:25:51 +0100187 *
188 * Policies are defined as arrays of this struct, the array must be
189 * accessible by attribute type up to the highest identifier to be expected.
190 *
Thomas Grafa5531a52006-08-26 20:11:47 -0700191 * Meaning of `len' field:
192 * NLA_STRING Maximum length of string
193 * NLA_NUL_STRING Maximum length of string (excluding NUL)
194 * NLA_FLAG Unused
Johannes Bergd30045a2007-03-23 11:37:48 -0700195 * NLA_BINARY Maximum length of attribute payload
Johannes Berg4b6cc722011-11-03 00:10:05 +0000196 * NLA_NESTED Don't use `len' field -- length verification is
197 * done by checking len of nested header (or empty)
198 * NLA_NESTED_COMPAT Minimum length of structure payload
199 * NLA_U8, NLA_U16,
200 * NLA_U32, NLA_U64,
Jiri Pirko4778e0b2012-07-27 06:28:52 +0000201 * NLA_S8, NLA_S16,
202 * NLA_S32, NLA_S64,
Johannes Berg4b6cc722011-11-03 00:10:05 +0000203 * NLA_MSECS Leaving the length field zero will verify the
204 * given type fits, using it verifies minimum length
205 * just like "All other"
206 * All other Minimum length of attribute payload
Thomas Grafa5531a52006-08-26 20:11:47 -0700207 *
Thomas Grafbfa83a92005-11-10 02:25:51 +0100208 * Example:
Alexey Dobriyanb54452b2010-02-18 08:14:31 +0000209 * static const struct nla_policy my_policy[ATTR_MAX+1] = {
Thomas Grafbfa83a92005-11-10 02:25:51 +0100210 * [ATTR_FOO] = { .type = NLA_U16 },
Johannes Bergd30045a2007-03-23 11:37:48 -0700211 * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
Thomas Grafa5531a52006-08-26 20:11:47 -0700212 * [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
Thomas Grafbfa83a92005-11-10 02:25:51 +0100213 * };
214 */
215struct nla_policy {
216 u16 type;
Thomas Grafa5531a52006-08-26 20:11:47 -0700217 u16 len;
Thomas Grafbfa83a92005-11-10 02:25:51 +0100218};
219
Thomas Graf4e902c52006-08-17 18:14:52 -0700220/**
221 * struct nl_info - netlink source information
222 * @nlh: Netlink message header of original request
Eric W. Biederman15e47302012-09-07 20:12:54 +0000223 * @portid: Netlink PORTID of requesting application
Thomas Graf4e902c52006-08-17 18:14:52 -0700224 */
225struct nl_info {
226 struct nlmsghdr *nlh;
Denis V. Lunev4d1169c2008-01-10 03:26:13 -0800227 struct net *nl_net;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000228 u32 portid;
Thomas Graf4e902c52006-08-17 18:14:52 -0700229};
230
Joe Perches4f690532013-09-21 10:22:50 -0700231int netlink_rcv_skb(struct sk_buff *skb,
232 int (*cb)(struct sk_buff *, struct nlmsghdr *));
233int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
234 unsigned int group, int report, gfp_t flags);
Thomas Graf82ace472005-11-10 02:25:53 +0100235
Joe Perches4f690532013-09-21 10:22:50 -0700236int nla_validate(const struct nlattr *head, int len, int maxtype,
237 const struct nla_policy *policy);
238int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
239 int len, const struct nla_policy *policy);
240int nla_policy_len(const struct nla_policy *, int);
241struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype);
242size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize);
243int nla_memcpy(void *dest, const struct nlattr *src, int count);
244int nla_memcmp(const struct nlattr *nla, const void *data, size_t size);
245int nla_strcmp(const struct nlattr *nla, const char *str);
246struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
247void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
248struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen);
249void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen);
250void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
251 const void *data);
252void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
253int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data);
254int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data);
255int nla_append(struct sk_buff *skb, int attrlen, const void *data);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100256
257/**************************************************************************
258 * Netlink Messages
259 **************************************************************************/
260
261/**
262 * nlmsg_msg_size - length of netlink message not including padding
263 * @payload: length of message payload
264 */
265static inline int nlmsg_msg_size(int payload)
266{
267 return NLMSG_HDRLEN + payload;
268}
269
270/**
271 * nlmsg_total_size - length of netlink message including padding
272 * @payload: length of message payload
273 */
274static inline int nlmsg_total_size(int payload)
275{
276 return NLMSG_ALIGN(nlmsg_msg_size(payload));
277}
278
279/**
280 * nlmsg_padlen - length of padding at the message's tail
281 * @payload: length of message payload
282 */
283static inline int nlmsg_padlen(int payload)
284{
285 return nlmsg_total_size(payload) - nlmsg_msg_size(payload);
286}
287
288/**
289 * nlmsg_data - head of message payload
Justin P. Mattock70f23fd2011-05-10 10:16:21 +0200290 * @nlh: netlink message header
Thomas Grafbfa83a92005-11-10 02:25:51 +0100291 */
292static inline void *nlmsg_data(const struct nlmsghdr *nlh)
293{
294 return (unsigned char *) nlh + NLMSG_HDRLEN;
295}
296
297/**
298 * nlmsg_len - length of message payload
299 * @nlh: netlink message header
300 */
301static inline int nlmsg_len(const struct nlmsghdr *nlh)
302{
303 return nlh->nlmsg_len - NLMSG_HDRLEN;
304}
305
306/**
307 * nlmsg_attrdata - head of attributes data
308 * @nlh: netlink message header
309 * @hdrlen: length of family specific header
310 */
311static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh,
312 int hdrlen)
313{
314 unsigned char *data = nlmsg_data(nlh);
315 return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen));
316}
317
318/**
319 * nlmsg_attrlen - length of attributes data
320 * @nlh: netlink message header
321 * @hdrlen: length of family specific header
322 */
323static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen)
324{
325 return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen);
326}
327
328/**
329 * nlmsg_ok - check if the netlink message fits into the remaining bytes
330 * @nlh: netlink message header
331 * @remaining: number of bytes remaining in message stream
332 */
333static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
334{
Vegard Nossum619e8032008-12-25 17:21:17 -0800335 return (remaining >= (int) sizeof(struct nlmsghdr) &&
Thomas Grafbfa83a92005-11-10 02:25:51 +0100336 nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
337 nlh->nlmsg_len <= remaining);
338}
339
340/**
341 * nlmsg_next - next netlink message in message stream
342 * @nlh: netlink message header
343 * @remaining: number of bytes remaining in message stream
344 *
345 * Returns the next netlink message in the message stream and
346 * decrements remaining by the size of the current message.
347 */
Jan Engelhardt36546542010-11-16 09:52:32 -0800348static inline struct nlmsghdr *
349nlmsg_next(const struct nlmsghdr *nlh, int *remaining)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100350{
351 int totlen = NLMSG_ALIGN(nlh->nlmsg_len);
352
353 *remaining -= totlen;
354
355 return (struct nlmsghdr *) ((unsigned char *) nlh + totlen);
356}
357
358/**
359 * nlmsg_parse - parse attributes of a netlink message
360 * @nlh: netlink message header
361 * @hdrlen: length of family specific header
362 * @tb: destination array with maxtype+1 elements
363 * @maxtype: maximum attribute type to be expected
364 * @policy: validation policy
365 *
366 * See nla_parse()
367 */
Patrick McHardy3a6c2b42009-08-25 16:07:40 +0200368static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen,
Thomas Grafbfa83a92005-11-10 02:25:51 +0100369 struct nlattr *tb[], int maxtype,
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700370 const struct nla_policy *policy)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100371{
372 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
373 return -EINVAL;
374
375 return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen),
376 nlmsg_attrlen(nlh, hdrlen), policy);
377}
378
379/**
380 * nlmsg_find_attr - find a specific attribute in a netlink message
381 * @nlh: netlink message header
382 * @hdrlen: length of familiy specific header
383 * @attrtype: type of attribute to look for
384 *
385 * Returns the first attribute which matches the specified type.
386 */
Nelson Elhage6b8c92b2010-11-03 16:35:40 +0000387static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh,
Thomas Grafbfa83a92005-11-10 02:25:51 +0100388 int hdrlen, int attrtype)
389{
390 return nla_find(nlmsg_attrdata(nlh, hdrlen),
391 nlmsg_attrlen(nlh, hdrlen), attrtype);
392}
393
394/**
395 * nlmsg_validate - validate a netlink message including attributes
396 * @nlh: netlinket message header
397 * @hdrlen: length of familiy specific header
398 * @maxtype: maximum attribute type to be expected
399 * @policy: validation policy
400 */
Jan Engelhardt36546542010-11-16 09:52:32 -0800401static inline int nlmsg_validate(const struct nlmsghdr *nlh,
402 int hdrlen, int maxtype,
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700403 const struct nla_policy *policy)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100404{
405 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
406 return -EINVAL;
407
408 return nla_validate(nlmsg_attrdata(nlh, hdrlen),
409 nlmsg_attrlen(nlh, hdrlen), maxtype, policy);
410}
411
412/**
Thomas Graf97676b62006-08-15 00:31:41 -0700413 * nlmsg_report - need to report back to application?
414 * @nlh: netlink message header
415 *
416 * Returns 1 if a report back to the application is requested.
417 */
Patrick McHardy3a6c2b42009-08-25 16:07:40 +0200418static inline int nlmsg_report(const struct nlmsghdr *nlh)
Thomas Graf97676b62006-08-15 00:31:41 -0700419{
420 return !!(nlh->nlmsg_flags & NLM_F_ECHO);
421}
422
423/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100424 * nlmsg_for_each_attr - iterate over a stream of attributes
425 * @pos: loop counter, set to current attribute
426 * @nlh: netlink message header
427 * @hdrlen: length of familiy specific header
428 * @rem: initialized to len, holds bytes currently remaining in stream
429 */
430#define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
431 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
432 nlmsg_attrlen(nlh, hdrlen), rem)
433
Thomas Grafbfa83a92005-11-10 02:25:51 +0100434/**
435 * nlmsg_put - Add a new netlink message to an skb
436 * @skb: socket buffer to store message in
Nicolas Dichtel2c6ba4b2014-10-16 15:47:51 +0200437 * @portid: netlink PORTID of requesting application
Thomas Grafbfa83a92005-11-10 02:25:51 +0100438 * @seq: sequence number of message
439 * @type: message type
440 * @payload: length of message payload
441 * @flags: message flags
442 *
443 * Returns NULL if the tailroom of the skb is insufficient to store
444 * the message header and payload.
445 */
Eric W. Biederman15e47302012-09-07 20:12:54 +0000446static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
Thomas Grafbfa83a92005-11-10 02:25:51 +0100447 int type, int payload, int flags)
448{
449 if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload)))
450 return NULL;
451
Eric W. Biederman15e47302012-09-07 20:12:54 +0000452 return __nlmsg_put(skb, portid, seq, type, payload, flags);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100453}
454
455/**
456 * nlmsg_put_answer - Add a new callback based netlink message to an skb
457 * @skb: socket buffer to store message in
458 * @cb: netlink callback
459 * @type: message type
460 * @payload: length of message payload
461 * @flags: message flags
462 *
463 * Returns NULL if the tailroom of the skb is insufficient to store
464 * the message header and payload.
465 */
466static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb,
467 struct netlink_callback *cb,
468 int type, int payload,
469 int flags)
470{
Eric W. Biederman15e47302012-09-07 20:12:54 +0000471 return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
Thomas Grafbfa83a92005-11-10 02:25:51 +0100472 type, payload, flags);
473}
474
475/**
476 * nlmsg_new - Allocate a new netlink message
Thomas Graf339bf982006-11-10 14:10:15 -0800477 * @payload: size of the message payload
Thomas Graffe4944e2006-08-04 23:03:05 -0700478 * @flags: the type of memory to allocate.
Thomas Grafbfa83a92005-11-10 02:25:51 +0100479 *
Thomas Graf339bf982006-11-10 14:10:15 -0800480 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
481 * and a good default is needed.
Thomas Grafbfa83a92005-11-10 02:25:51 +0100482 */
Thomas Graf339bf982006-11-10 14:10:15 -0800483static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100484{
Thomas Graf339bf982006-11-10 14:10:15 -0800485 return alloc_skb(nlmsg_total_size(payload), flags);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100486}
487
488/**
489 * nlmsg_end - Finalize a netlink message
490 * @skb: socket buffer the message is stored in
491 * @nlh: netlink message header
492 *
493 * Corrects the netlink message header to include the appeneded
494 * attributes. Only necessary if attributes have been added to
495 * the message.
Thomas Grafbfa83a92005-11-10 02:25:51 +0100496 */
Johannes Berg053c0952015-01-16 22:09:00 +0100497static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100498{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700499 nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
Thomas Grafbfa83a92005-11-10 02:25:51 +0100500}
501
502/**
Thomas Graffe4944e2006-08-04 23:03:05 -0700503 * nlmsg_get_pos - return current position in netlink message
504 * @skb: socket buffer the message is stored in
505 *
506 * Returns a pointer to the current tail of the message.
507 */
508static inline void *nlmsg_get_pos(struct sk_buff *skb)
509{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700510 return skb_tail_pointer(skb);
Thomas Graffe4944e2006-08-04 23:03:05 -0700511}
512
513/**
514 * nlmsg_trim - Trim message to a mark
515 * @skb: socket buffer the message is stored in
516 * @mark: mark to trim to
517 *
Thomas Grafbc3ed282008-06-03 16:36:54 -0700518 * Trims the message to the provided mark.
Thomas Graffe4944e2006-08-04 23:03:05 -0700519 */
Thomas Grafbc3ed282008-06-03 16:36:54 -0700520static inline void nlmsg_trim(struct sk_buff *skb, const void *mark)
Thomas Graffe4944e2006-08-04 23:03:05 -0700521{
Thomas Graf149118d2015-01-06 01:04:21 +0100522 if (mark) {
523 WARN_ON((unsigned char *) mark < skb->data);
Thomas Graffe4944e2006-08-04 23:03:05 -0700524 skb_trim(skb, (unsigned char *) mark - skb->data);
Thomas Graf149118d2015-01-06 01:04:21 +0100525 }
Thomas Graffe4944e2006-08-04 23:03:05 -0700526}
527
528/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100529 * nlmsg_cancel - Cancel construction of a netlink message
530 * @skb: socket buffer the message is stored in
531 * @nlh: netlink message header
532 *
533 * Removes the complete netlink message including all
Thomas Grafbc3ed282008-06-03 16:36:54 -0700534 * attributes from the socket buffer again.
Thomas Grafbfa83a92005-11-10 02:25:51 +0100535 */
Thomas Grafbc3ed282008-06-03 16:36:54 -0700536static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100537{
Thomas Grafbc3ed282008-06-03 16:36:54 -0700538 nlmsg_trim(skb, nlh);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100539}
540
541/**
542 * nlmsg_free - free a netlink message
543 * @skb: socket buffer of netlink message
544 */
545static inline void nlmsg_free(struct sk_buff *skb)
546{
547 kfree_skb(skb);
548}
549
550/**
551 * nlmsg_multicast - multicast a netlink message
552 * @sk: netlink socket to spread messages to
553 * @skb: netlink message as socket buffer
Eric W. Biederman15e47302012-09-07 20:12:54 +0000554 * @portid: own netlink portid to avoid sending to yourself
Thomas Grafbfa83a92005-11-10 02:25:51 +0100555 * @group: multicast group id
Thomas Grafd387f6a2006-08-15 00:31:06 -0700556 * @flags: allocation flags
Thomas Grafbfa83a92005-11-10 02:25:51 +0100557 */
558static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb,
Eric W. Biederman15e47302012-09-07 20:12:54 +0000559 u32 portid, unsigned int group, gfp_t flags)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100560{
561 int err;
562
563 NETLINK_CB(skb).dst_group = group;
564
Eric W. Biederman15e47302012-09-07 20:12:54 +0000565 err = netlink_broadcast(sk, skb, portid, group, flags);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100566 if (err > 0)
567 err = 0;
568
569 return err;
570}
571
572/**
573 * nlmsg_unicast - unicast a netlink message
574 * @sk: netlink socket to spread message to
575 * @skb: netlink message as socket buffer
Eric W. Biederman15e47302012-09-07 20:12:54 +0000576 * @portid: netlink portid of the destination socket
Thomas Grafbfa83a92005-11-10 02:25:51 +0100577 */
Eric W. Biederman15e47302012-09-07 20:12:54 +0000578static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100579{
580 int err;
581
Eric W. Biederman15e47302012-09-07 20:12:54 +0000582 err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100583 if (err > 0)
584 err = 0;
585
586 return err;
587}
588
589/**
590 * nlmsg_for_each_msg - iterate over a stream of messages
591 * @pos: loop counter, set to current message
592 * @head: head of message stream
593 * @len: length of message stream
594 * @rem: initialized to len, holds bytes currently remaining in stream
595 */
596#define nlmsg_for_each_msg(pos, head, len, rem) \
597 for (pos = head, rem = len; \
598 nlmsg_ok(pos, rem); \
599 pos = nlmsg_next(pos, &(rem)))
600
Johannes Berg670dc282011-06-20 13:40:46 +0200601/**
602 * nl_dump_check_consistent - check if sequence is consistent and advertise if not
603 * @cb: netlink callback structure that stores the sequence number
604 * @nlh: netlink message header to write the flag to
605 *
606 * This function checks if the sequence (generation) number changed during dump
607 * and if it did, advertises it in the netlink message header.
608 *
609 * The correct way to use it is to set cb->seq to the generation counter when
610 * all locks for dumping have been acquired, and then call this function for
611 * each message that is generated.
612 *
613 * Note that due to initialisation concerns, 0 is an invalid sequence number
614 * and must not be used by code that uses this functionality.
615 */
616static inline void
617nl_dump_check_consistent(struct netlink_callback *cb,
618 struct nlmsghdr *nlh)
619{
620 if (cb->prev_seq && cb->seq != cb->prev_seq)
621 nlh->nlmsg_flags |= NLM_F_DUMP_INTR;
622 cb->prev_seq = cb->seq;
623}
624
Thomas Grafbfa83a92005-11-10 02:25:51 +0100625/**************************************************************************
626 * Netlink Attributes
627 **************************************************************************/
628
629/**
630 * nla_attr_size - length of attribute not including padding
631 * @payload: length of payload
632 */
633static inline int nla_attr_size(int payload)
634{
635 return NLA_HDRLEN + payload;
636}
637
638/**
639 * nla_total_size - total length of attribute including padding
640 * @payload: length of payload
641 */
642static inline int nla_total_size(int payload)
643{
644 return NLA_ALIGN(nla_attr_size(payload));
645}
646
647/**
648 * nla_padlen - length of padding at the tail of attribute
649 * @payload: length of payload
650 */
651static inline int nla_padlen(int payload)
652{
653 return nla_total_size(payload) - nla_attr_size(payload);
654}
655
656/**
Thomas Graf8f4c1f92007-09-12 14:44:36 +0200657 * nla_type - attribute type
658 * @nla: netlink attribute
659 */
660static inline int nla_type(const struct nlattr *nla)
661{
662 return nla->nla_type & NLA_TYPE_MASK;
663}
664
665/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100666 * nla_data - head of payload
667 * @nla: netlink attribute
668 */
669static inline void *nla_data(const struct nlattr *nla)
670{
671 return (char *) nla + NLA_HDRLEN;
672}
673
674/**
675 * nla_len - length of payload
676 * @nla: netlink attribute
677 */
678static inline int nla_len(const struct nlattr *nla)
679{
680 return nla->nla_len - NLA_HDRLEN;
681}
682
683/**
684 * nla_ok - check if the netlink attribute fits into the remaining bytes
685 * @nla: netlink attribute
686 * @remaining: number of bytes remaining in attribute stream
687 */
688static inline int nla_ok(const struct nlattr *nla, int remaining)
689{
Vegard Nossum1045b032008-09-11 19:05:29 -0700690 return remaining >= (int) sizeof(*nla) &&
Thomas Grafbfa83a92005-11-10 02:25:51 +0100691 nla->nla_len >= sizeof(*nla) &&
692 nla->nla_len <= remaining;
693}
694
695/**
Pierre Ynardd1ec3b72007-10-10 21:09:48 -0700696 * nla_next - next netlink attribute in attribute stream
Thomas Grafbfa83a92005-11-10 02:25:51 +0100697 * @nla: netlink attribute
698 * @remaining: number of bytes remaining in attribute stream
699 *
700 * Returns the next netlink attribute in the attribute stream and
701 * decrements remaining by the size of the current attribute.
702 */
703static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
704{
705 int totlen = NLA_ALIGN(nla->nla_len);
706
707 *remaining -= totlen;
708 return (struct nlattr *) ((char *) nla + totlen);
709}
710
711/**
Thomas Graffe4944e2006-08-04 23:03:05 -0700712 * nla_find_nested - find attribute in a set of nested attributes
713 * @nla: attribute containing the nested attributes
714 * @attrtype: type of attribute to look for
715 *
716 * Returns the first attribute which matches the specified type.
717 */
Jan Engelhardt36546542010-11-16 09:52:32 -0800718static inline struct nlattr *
719nla_find_nested(const struct nlattr *nla, int attrtype)
Thomas Graffe4944e2006-08-04 23:03:05 -0700720{
721 return nla_find(nla_data(nla), nla_len(nla), attrtype);
722}
723
724/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100725 * nla_parse_nested - parse nested attributes
726 * @tb: destination array with maxtype+1 elements
727 * @maxtype: maximum attribute type to be expected
728 * @nla: attribute containing the nested attributes
729 * @policy: validation policy
730 *
731 * See nla_parse()
732 */
733static inline int nla_parse_nested(struct nlattr *tb[], int maxtype,
Patrick McHardyb057efd2008-10-28 11:59:11 -0700734 const struct nlattr *nla,
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700735 const struct nla_policy *policy)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100736{
737 return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy);
738}
Patrick McHardy1092cb22007-06-25 13:49:35 -0700739
740/**
Pierre Ynardd1ec3b72007-10-10 21:09:48 -0700741 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
Thomas Grafbfa83a92005-11-10 02:25:51 +0100742 * @skb: socket buffer to add attribute to
743 * @attrtype: attribute type
744 * @value: numeric value
745 */
746static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value)
747{
748 return nla_put(skb, attrtype, sizeof(u8), &value);
749}
750
751/**
752 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
753 * @skb: socket buffer to add attribute to
754 * @attrtype: attribute type
755 * @value: numeric value
756 */
757static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value)
758{
759 return nla_put(skb, attrtype, sizeof(u16), &value);
760}
761
762/**
David S. Miller569a8fc2012-03-29 23:18:53 -0400763 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
764 * @skb: socket buffer to add attribute to
765 * @attrtype: attribute type
766 * @value: numeric value
767 */
768static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value)
769{
770 return nla_put(skb, attrtype, sizeof(__be16), &value);
771}
772
773/**
David S. Miller6c1dd3b2012-04-01 19:11:31 -0400774 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
775 * @skb: socket buffer to add attribute to
776 * @attrtype: attribute type
777 * @value: numeric value
778 */
779static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value)
780{
781 return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value);
782}
783
784/**
David S. Miller24c410d2012-04-01 20:14:27 -0400785 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
786 * @skb: socket buffer to add attribute to
787 * @attrtype: attribute type
788 * @value: numeric value
789 */
790static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value)
791{
792 return nla_put(skb, attrtype, sizeof(__le16), &value);
793}
794
795/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100796 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
797 * @skb: socket buffer to add attribute to
798 * @attrtype: attribute type
799 * @value: numeric value
800 */
801static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value)
802{
803 return nla_put(skb, attrtype, sizeof(u32), &value);
804}
805
806/**
David S. Miller569a8fc2012-03-29 23:18:53 -0400807 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
808 * @skb: socket buffer to add attribute to
809 * @attrtype: attribute type
810 * @value: numeric value
811 */
812static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value)
813{
814 return nla_put(skb, attrtype, sizeof(__be32), &value);
815}
816
817/**
David S. Miller6c1dd3b2012-04-01 19:11:31 -0400818 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
819 * @skb: socket buffer to add attribute to
820 * @attrtype: attribute type
821 * @value: numeric value
822 */
823static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value)
824{
825 return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value);
826}
827
828/**
David S. Miller24c410d2012-04-01 20:14:27 -0400829 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
830 * @skb: socket buffer to add attribute to
831 * @attrtype: attribute type
832 * @value: numeric value
833 */
834static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value)
835{
836 return nla_put(skb, attrtype, sizeof(__le32), &value);
837}
838
839/**
David S. Miller569a8fc2012-03-29 23:18:53 -0400840 * nla_put_u64 - Add a u64 netlink attribute to a socket buffer
Thomas Grafbfa83a92005-11-10 02:25:51 +0100841 * @skb: socket buffer to add attribute to
842 * @attrtype: attribute type
843 * @value: numeric value
844 */
845static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value)
846{
847 return nla_put(skb, attrtype, sizeof(u64), &value);
848}
849
850/**
David S. Miller569a8fc2012-03-29 23:18:53 -0400851 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer
852 * @skb: socket buffer to add attribute to
853 * @attrtype: attribute type
854 * @value: numeric value
855 */
856static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value)
857{
858 return nla_put(skb, attrtype, sizeof(__be64), &value);
859}
860
861/**
David S. Miller6c1dd3b2012-04-01 19:11:31 -0400862 * nla_put_net64 - Add 64-bit network byte order netlink attribute to a socket buffer
863 * @skb: socket buffer to add attribute to
864 * @attrtype: attribute type
865 * @value: numeric value
866 */
867static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value)
868{
869 return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value);
870}
871
872/**
David S. Miller24c410d2012-04-01 20:14:27 -0400873 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer
874 * @skb: socket buffer to add attribute to
875 * @attrtype: attribute type
876 * @value: numeric value
877 */
878static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value)
879{
880 return nla_put(skb, attrtype, sizeof(__le64), &value);
881}
882
883/**
Jiri Pirko4778e0b2012-07-27 06:28:52 +0000884 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
885 * @skb: socket buffer to add attribute to
886 * @attrtype: attribute type
887 * @value: numeric value
888 */
889static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value)
890{
891 return nla_put(skb, attrtype, sizeof(s8), &value);
892}
893
894/**
895 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
896 * @skb: socket buffer to add attribute to
897 * @attrtype: attribute type
898 * @value: numeric value
899 */
900static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value)
901{
902 return nla_put(skb, attrtype, sizeof(s16), &value);
903}
904
905/**
906 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
907 * @skb: socket buffer to add attribute to
908 * @attrtype: attribute type
909 * @value: numeric value
910 */
911static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value)
912{
913 return nla_put(skb, attrtype, sizeof(s32), &value);
914}
915
916/**
917 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer
918 * @skb: socket buffer to add attribute to
919 * @attrtype: attribute type
920 * @value: numeric value
921 */
922static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value)
923{
924 return nla_put(skb, attrtype, sizeof(s64), &value);
925}
926
927/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100928 * nla_put_string - Add a string netlink attribute to a socket buffer
929 * @skb: socket buffer to add attribute to
930 * @attrtype: attribute type
931 * @str: NUL terminated string
932 */
933static inline int nla_put_string(struct sk_buff *skb, int attrtype,
934 const char *str)
935{
936 return nla_put(skb, attrtype, strlen(str) + 1, str);
937}
938
939/**
940 * nla_put_flag - Add a flag netlink attribute to a socket buffer
941 * @skb: socket buffer to add attribute to
942 * @attrtype: attribute type
943 */
944static inline int nla_put_flag(struct sk_buff *skb, int attrtype)
945{
946 return nla_put(skb, attrtype, 0, NULL);
947}
948
949/**
950 * nla_put_msecs - Add a msecs netlink attribute to a socket buffer
951 * @skb: socket buffer to add attribute to
952 * @attrtype: attribute type
Mark Rustadd87de1f2014-07-25 02:18:17 -0700953 * @njiffies: number of jiffies to convert to msecs
Thomas Grafbfa83a92005-11-10 02:25:51 +0100954 */
955static inline int nla_put_msecs(struct sk_buff *skb, int attrtype,
Mark Rustadd87de1f2014-07-25 02:18:17 -0700956 unsigned long njiffies)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100957{
Mark Rustadd87de1f2014-07-25 02:18:17 -0700958 u64 tmp = jiffies_to_msecs(njiffies);
Thomas Grafbfa83a92005-11-10 02:25:51 +0100959 return nla_put(skb, attrtype, sizeof(u64), &tmp);
960}
961
Thomas Grafbfa83a92005-11-10 02:25:51 +0100962/**
Jiri Benc930345e2015-03-29 16:59:25 +0200963 * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
964 * buffer
965 * @skb: socket buffer to add attribute to
966 * @attrtype: attribute type
967 * @addr: IPv4 address
968 */
969static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype,
970 __be32 addr)
971{
972 return nla_put_be32(skb, attrtype, addr);
973}
974
975/**
976 * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
977 * buffer
978 * @skb: socket buffer to add attribute to
979 * @attrtype: attribute type
980 * @addr: IPv6 address
981 */
982static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype,
983 const struct in6_addr *addr)
984{
985 return nla_put(skb, attrtype, sizeof(*addr), addr);
986}
987
988/**
Thomas Grafbfa83a92005-11-10 02:25:51 +0100989 * nla_get_u32 - return payload of u32 attribute
990 * @nla: u32 netlink attribute
991 */
Patrick McHardyb057efd2008-10-28 11:59:11 -0700992static inline u32 nla_get_u32(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +0100993{
994 return *(u32 *) nla_data(nla);
995}
996
997/**
Al Viro00012e52006-09-26 22:14:41 -0700998 * nla_get_be32 - return payload of __be32 attribute
999 * @nla: __be32 netlink attribute
1000 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001001static inline __be32 nla_get_be32(const struct nlattr *nla)
Al Viro00012e52006-09-26 22:14:41 -07001002{
1003 return *(__be32 *) nla_data(nla);
1004}
1005
1006/**
Thomas Grafbfa83a92005-11-10 02:25:51 +01001007 * nla_get_u16 - return payload of u16 attribute
1008 * @nla: u16 netlink attribute
1009 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001010static inline u16 nla_get_u16(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001011{
1012 return *(u16 *) nla_data(nla);
1013}
1014
1015/**
Patrick McHardy838965b2007-12-17 22:29:26 -08001016 * nla_get_be16 - return payload of __be16 attribute
1017 * @nla: __be16 netlink attribute
1018 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001019static inline __be16 nla_get_be16(const struct nlattr *nla)
Patrick McHardy838965b2007-12-17 22:29:26 -08001020{
1021 return *(__be16 *) nla_data(nla);
1022}
1023
1024/**
Thomas Graf4a89c252006-11-24 17:14:51 -08001025 * nla_get_le16 - return payload of __le16 attribute
1026 * @nla: __le16 netlink attribute
1027 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001028static inline __le16 nla_get_le16(const struct nlattr *nla)
Thomas Graf4a89c252006-11-24 17:14:51 -08001029{
1030 return *(__le16 *) nla_data(nla);
1031}
1032
1033/**
Thomas Grafbfa83a92005-11-10 02:25:51 +01001034 * nla_get_u8 - return payload of u8 attribute
1035 * @nla: u8 netlink attribute
1036 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001037static inline u8 nla_get_u8(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001038{
1039 return *(u8 *) nla_data(nla);
1040}
1041
1042/**
1043 * nla_get_u64 - return payload of u64 attribute
1044 * @nla: u64 netlink attribute
1045 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001046static inline u64 nla_get_u64(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001047{
1048 u64 tmp;
1049
1050 nla_memcpy(&tmp, nla, sizeof(tmp));
1051
1052 return tmp;
1053}
1054
1055/**
Pablo Neira Ayusoa17c8592009-05-27 17:50:35 +02001056 * nla_get_be64 - return payload of __be64 attribute
1057 * @nla: __be64 netlink attribute
1058 */
1059static inline __be64 nla_get_be64(const struct nlattr *nla)
1060{
Pablo Neira Ayusof5d410f2010-03-16 13:30:44 +00001061 __be64 tmp;
1062
1063 nla_memcpy(&tmp, nla, sizeof(tmp));
1064
1065 return tmp;
Pablo Neira Ayusoa17c8592009-05-27 17:50:35 +02001066}
1067
1068/**
Jiri Pirko4778e0b2012-07-27 06:28:52 +00001069 * nla_get_s32 - return payload of s32 attribute
1070 * @nla: s32 netlink attribute
1071 */
1072static inline s32 nla_get_s32(const struct nlattr *nla)
1073{
1074 return *(s32 *) nla_data(nla);
1075}
1076
1077/**
1078 * nla_get_s16 - return payload of s16 attribute
1079 * @nla: s16 netlink attribute
1080 */
1081static inline s16 nla_get_s16(const struct nlattr *nla)
1082{
1083 return *(s16 *) nla_data(nla);
1084}
1085
1086/**
1087 * nla_get_s8 - return payload of s8 attribute
1088 * @nla: s8 netlink attribute
1089 */
1090static inline s8 nla_get_s8(const struct nlattr *nla)
1091{
1092 return *(s8 *) nla_data(nla);
1093}
1094
1095/**
1096 * nla_get_s64 - return payload of s64 attribute
1097 * @nla: s64 netlink attribute
1098 */
1099static inline s64 nla_get_s64(const struct nlattr *nla)
1100{
1101 s64 tmp;
1102
1103 nla_memcpy(&tmp, nla, sizeof(tmp));
1104
1105 return tmp;
1106}
1107
1108/**
Thomas Grafbfa83a92005-11-10 02:25:51 +01001109 * nla_get_flag - return payload of flag attribute
1110 * @nla: flag netlink attribute
1111 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001112static inline int nla_get_flag(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001113{
1114 return !!nla;
1115}
1116
1117/**
1118 * nla_get_msecs - return payload of msecs attribute
1119 * @nla: msecs netlink attribute
1120 *
1121 * Returns the number of milliseconds in jiffies.
1122 */
Patrick McHardyb057efd2008-10-28 11:59:11 -07001123static inline unsigned long nla_get_msecs(const struct nlattr *nla)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001124{
1125 u64 msecs = nla_get_u64(nla);
1126
1127 return msecs_to_jiffies((unsigned long) msecs);
1128}
1129
1130/**
Jiri Benc67b61f62015-03-29 16:59:26 +02001131 * nla_get_in_addr - return payload of IPv4 address attribute
1132 * @nla: IPv4 address netlink attribute
1133 */
1134static inline __be32 nla_get_in_addr(const struct nlattr *nla)
1135{
1136 return *(__be32 *) nla_data(nla);
1137}
1138
1139/**
1140 * nla_get_in6_addr - return payload of IPv6 address attribute
1141 * @nla: IPv6 address netlink attribute
1142 */
1143static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
1144{
1145 struct in6_addr tmp;
1146
1147 nla_memcpy(&tmp, nla, sizeof(tmp));
1148 return tmp;
1149}
1150
1151/**
Thomas Grafbfa83a92005-11-10 02:25:51 +01001152 * nla_nest_start - Start a new level of nested attributes
1153 * @skb: socket buffer to add attributes to
1154 * @attrtype: attribute type of container
1155 *
1156 * Returns the container attribute
1157 */
1158static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype)
1159{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001160 struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb);
Thomas Grafbfa83a92005-11-10 02:25:51 +01001161
1162 if (nla_put(skb, attrtype, 0, NULL) < 0)
1163 return NULL;
1164
1165 return start;
1166}
1167
1168/**
1169 * nla_nest_end - Finalize nesting of attributes
Pierre Ynardd1ec3b72007-10-10 21:09:48 -07001170 * @skb: socket buffer the attributes are stored in
Thomas Grafbfa83a92005-11-10 02:25:51 +01001171 * @start: container attribute
1172 *
1173 * Corrects the container attribute header to include the all
1174 * appeneded attributes.
1175 *
1176 * Returns the total data length of the skb.
1177 */
1178static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start)
1179{
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001180 start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start;
Thomas Grafbfa83a92005-11-10 02:25:51 +01001181 return skb->len;
1182}
1183
1184/**
1185 * nla_nest_cancel - Cancel nesting of attributes
1186 * @skb: socket buffer the message is stored in
1187 * @start: container attribute
1188 *
1189 * Removes the container attribute and including all nested
Thomas Grafbc3ed282008-06-03 16:36:54 -07001190 * attributes. Returns -EMSGSIZE
Thomas Grafbfa83a92005-11-10 02:25:51 +01001191 */
Thomas Grafbc3ed282008-06-03 16:36:54 -07001192static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start)
Thomas Grafbfa83a92005-11-10 02:25:51 +01001193{
Thomas Grafbc3ed282008-06-03 16:36:54 -07001194 nlmsg_trim(skb, start);
Thomas Grafbfa83a92005-11-10 02:25:51 +01001195}
1196
1197/**
Paul Moore4fe5d5c2006-09-25 15:54:03 -07001198 * nla_validate_nested - Validate a stream of nested attributes
1199 * @start: container attribute
1200 * @maxtype: maximum attribute type to be expected
1201 * @policy: validation policy
1202 *
1203 * Validates all attributes in the nested attribute stream against the
1204 * specified policy. Attributes with a type exceeding maxtype will be
1205 * ignored. See documenation of struct nla_policy for more details.
1206 *
1207 * Returns 0 on success or a negative error code.
1208 */
Jan Engelhardt36546542010-11-16 09:52:32 -08001209static inline int nla_validate_nested(const struct nlattr *start, int maxtype,
Patrick McHardyef7c79e2007-06-05 12:38:30 -07001210 const struct nla_policy *policy)
Paul Moore4fe5d5c2006-09-25 15:54:03 -07001211{
1212 return nla_validate(nla_data(start), nla_len(start), maxtype, policy);
1213}
1214
1215/**
Thomas Grafbfa83a92005-11-10 02:25:51 +01001216 * nla_for_each_attr - iterate over a stream of attributes
1217 * @pos: loop counter, set to current attribute
1218 * @head: head of attribute stream
1219 * @len: length of attribute stream
1220 * @rem: initialized to len, holds bytes currently remaining in stream
1221 */
1222#define nla_for_each_attr(pos, head, len, rem) \
1223 for (pos = head, rem = len; \
1224 nla_ok(pos, rem); \
1225 pos = nla_next(pos, &(rem)))
1226
Thomas Graffe4944e2006-08-04 23:03:05 -07001227/**
1228 * nla_for_each_nested - iterate over nested attributes
1229 * @pos: loop counter, set to current attribute
1230 * @nla: attribute containing the nested attributes
1231 * @rem: initialized to len, holds bytes currently remaining in stream
1232 */
1233#define nla_for_each_nested(pos, nla, rem) \
1234 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
1235
Simon Horman941d8eb2014-10-27 16:12:16 +09001236/**
1237 * nla_is_last - Test if attribute is last in stream
1238 * @nla: attribute to test
1239 * @rem: bytes remaining in stream
1240 */
1241static inline bool nla_is_last(const struct nlattr *nla, int rem)
1242{
1243 return nla->nla_len == rem;
1244}
1245
Thomas Grafbfa83a92005-11-10 02:25:51 +01001246#endif