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bfa83a9e TG |
1 | #ifndef __NET_NETLINK_H |
2 | #define __NET_NETLINK_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/netlink.h> | |
d7fe0f24 | 6 | #include <linux/jiffies.h> |
bfa83a9e TG |
7 | |
8 | /* ======================================================================== | |
9 | * Netlink Messages and Attributes Interface (As Seen On TV) | |
10 | * ------------------------------------------------------------------------ | |
11 | * Messages Interface | |
12 | * ------------------------------------------------------------------------ | |
13 | * | |
14 | * Message Format: | |
15 | * <--- nlmsg_total_size(payload) ---> | |
16 | * <-- nlmsg_msg_size(payload) -> | |
17 | * +----------+- - -+-------------+- - -+-------- - - | |
18 | * | nlmsghdr | Pad | Payload | Pad | nlmsghdr | |
19 | * +----------+- - -+-------------+- - -+-------- - - | |
20 | * nlmsg_data(nlh)---^ ^ | |
21 | * nlmsg_next(nlh)-----------------------+ | |
22 | * | |
23 | * Payload Format: | |
24 | * <---------------------- nlmsg_len(nlh) ---------------------> | |
25 | * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> | |
26 | * +----------------------+- - -+--------------------------------+ | |
27 | * | Family Header | Pad | Attributes | | |
28 | * +----------------------+- - -+--------------------------------+ | |
29 | * nlmsg_attrdata(nlh, hdrlen)---^ | |
30 | * | |
31 | * Data Structures: | |
32 | * struct nlmsghdr netlink message header | |
33 | * | |
34 | * Message Construction: | |
35 | * nlmsg_new() create a new netlink message | |
36 | * nlmsg_put() add a netlink message to an skb | |
37 | * nlmsg_put_answer() callback based nlmsg_put() | |
1dc8d8c0 | 38 | * nlmsg_end() finalize netlink message |
fe4944e5 TG |
39 | * nlmsg_get_pos() return current position in message |
40 | * nlmsg_trim() trim part of message | |
bfa83a9e TG |
41 | * nlmsg_cancel() cancel message construction |
42 | * nlmsg_free() free a netlink message | |
43 | * | |
44 | * Message Sending: | |
45 | * nlmsg_multicast() multicast message to several groups | |
46 | * nlmsg_unicast() unicast a message to a single socket | |
d387f6ad | 47 | * nlmsg_notify() send notification message |
bfa83a9e TG |
48 | * |
49 | * Message Length Calculations: | |
50 | * nlmsg_msg_size(payload) length of message w/o padding | |
51 | * nlmsg_total_size(payload) length of message w/ padding | |
52 | * nlmsg_padlen(payload) length of padding at tail | |
53 | * | |
54 | * Message Payload Access: | |
55 | * nlmsg_data(nlh) head of message payload | |
56 | * nlmsg_len(nlh) length of message payload | |
57 | * nlmsg_attrdata(nlh, hdrlen) head of attributes data | |
58 | * nlmsg_attrlen(nlh, hdrlen) length of attributes data | |
59 | * | |
60 | * Message Parsing: | |
61 | * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? | |
62 | * nlmsg_next(nlh, remaining) get next netlink message | |
63 | * nlmsg_parse() parse attributes of a message | |
64 | * nlmsg_find_attr() find an attribute in a message | |
65 | * nlmsg_for_each_msg() loop over all messages | |
66 | * nlmsg_validate() validate netlink message incl. attrs | |
67 | * nlmsg_for_each_attr() loop over all attributes | |
68 | * | |
97676b6b TG |
69 | * Misc: |
70 | * nlmsg_report() report back to application? | |
71 | * | |
bfa83a9e TG |
72 | * ------------------------------------------------------------------------ |
73 | * Attributes Interface | |
74 | * ------------------------------------------------------------------------ | |
75 | * | |
76 | * Attribute Format: | |
77 | * <------- nla_total_size(payload) -------> | |
78 | * <---- nla_attr_size(payload) -----> | |
79 | * +----------+- - -+- - - - - - - - - +- - -+-------- - - | |
80 | * | Header | Pad | Payload | Pad | Header | |
81 | * +----------+- - -+- - - - - - - - - +- - -+-------- - - | |
82 | * <- nla_len(nla) -> ^ | |
83 | * nla_data(nla)----^ | | |
84 | * nla_next(nla)-----------------------------' | |
85 | * | |
86 | * Data Structures: | |
d1ec3b77 | 87 | * struct nlattr netlink attribute header |
bfa83a9e TG |
88 | * |
89 | * Attribute Construction: | |
fe4944e5 TG |
90 | * nla_reserve(skb, type, len) reserve room for an attribute |
91 | * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr | |
bfa83a9e | 92 | * nla_put(skb, type, len, data) add attribute to skb |
fe4944e5 | 93 | * nla_put_nohdr(skb, len, data) add attribute w/o hdr |
01480e1c | 94 | * nla_append(skb, len, data) append data to skb |
bfa83a9e TG |
95 | * |
96 | * Attribute Construction for Basic Types: | |
97 | * nla_put_u8(skb, type, value) add u8 attribute to skb | |
98 | * nla_put_u16(skb, type, value) add u16 attribute to skb | |
99 | * nla_put_u32(skb, type, value) add u32 attribute to skb | |
100 | * nla_put_u64(skb, type, value) add u64 attribute to skb | |
101 | * nla_put_string(skb, type, str) add string attribute to skb | |
102 | * nla_put_flag(skb, type) add flag attribute to skb | |
103 | * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb | |
104 | * | |
bfa83a9e TG |
105 | * Nested Attributes Construction: |
106 | * nla_nest_start(skb, type) start a nested attribute | |
107 | * nla_nest_end(skb, nla) finalize a nested attribute | |
108 | * nla_nest_cancel(skb, nla) cancel nested attribute construction | |
109 | * | |
110 | * Attribute Length Calculations: | |
111 | * nla_attr_size(payload) length of attribute w/o padding | |
112 | * nla_total_size(payload) length of attribute w/ padding | |
113 | * nla_padlen(payload) length of padding | |
114 | * | |
115 | * Attribute Payload Access: | |
116 | * nla_data(nla) head of attribute payload | |
117 | * nla_len(nla) length of attribute payload | |
118 | * | |
119 | * Attribute Payload Access for Basic Types: | |
120 | * nla_get_u8(nla) get payload for a u8 attribute | |
121 | * nla_get_u16(nla) get payload for a u16 attribute | |
122 | * nla_get_u32(nla) get payload for a u32 attribute | |
123 | * nla_get_u64(nla) get payload for a u64 attribute | |
124 | * nla_get_flag(nla) return 1 if flag is true | |
125 | * nla_get_msecs(nla) get payload for a msecs attribute | |
126 | * | |
127 | * Attribute Misc: | |
128 | * nla_memcpy(dest, nla, count) copy attribute into memory | |
129 | * nla_memcmp(nla, data, size) compare attribute with memory area | |
130 | * nla_strlcpy(dst, nla, size) copy attribute to a sized string | |
131 | * nla_strcmp(nla, str) compare attribute with string | |
132 | * | |
133 | * Attribute Parsing: | |
134 | * nla_ok(nla, remaining) does nla fit into remaining bytes? | |
135 | * nla_next(nla, remaining) get next netlink attribute | |
136 | * nla_validate() validate a stream of attributes | |
4fe5d5c0 | 137 | * nla_validate_nested() validate a stream of nested attributes |
bfa83a9e | 138 | * nla_find() find attribute in stream of attributes |
fe4944e5 | 139 | * nla_find_nested() find attribute in nested attributes |
bfa83a9e TG |
140 | * nla_parse() parse and validate stream of attrs |
141 | * nla_parse_nested() parse nested attribuets | |
142 | * nla_for_each_attr() loop over all attributes | |
22acb19a | 143 | * nla_for_each_nested() loop over the nested attributes |
bfa83a9e TG |
144 | *========================================================================= |
145 | */ | |
146 | ||
147 | /** | |
148 | * Standard attribute types to specify validation policy | |
149 | */ | |
150 | enum { | |
151 | NLA_UNSPEC, | |
152 | NLA_U8, | |
153 | NLA_U16, | |
154 | NLA_U32, | |
155 | NLA_U64, | |
156 | NLA_STRING, | |
157 | NLA_FLAG, | |
158 | NLA_MSECS, | |
159 | NLA_NESTED, | |
1092cb21 | 160 | NLA_NESTED_COMPAT, |
a5531a5d | 161 | NLA_NUL_STRING, |
d30045a0 | 162 | NLA_BINARY, |
bfa83a9e TG |
163 | __NLA_TYPE_MAX, |
164 | }; | |
165 | ||
166 | #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) | |
167 | ||
168 | /** | |
169 | * struct nla_policy - attribute validation policy | |
170 | * @type: Type of attribute or NLA_UNSPEC | |
a5531a5d | 171 | * @len: Type specific length of payload |
bfa83a9e TG |
172 | * |
173 | * Policies are defined as arrays of this struct, the array must be | |
174 | * accessible by attribute type up to the highest identifier to be expected. | |
175 | * | |
a5531a5d TG |
176 | * Meaning of `len' field: |
177 | * NLA_STRING Maximum length of string | |
178 | * NLA_NUL_STRING Maximum length of string (excluding NUL) | |
179 | * NLA_FLAG Unused | |
d30045a0 | 180 | * NLA_BINARY Maximum length of attribute payload |
4b6cc728 JB |
181 | * NLA_NESTED Don't use `len' field -- length verification is |
182 | * done by checking len of nested header (or empty) | |
183 | * NLA_NESTED_COMPAT Minimum length of structure payload | |
184 | * NLA_U8, NLA_U16, | |
185 | * NLA_U32, NLA_U64, | |
186 | * NLA_MSECS Leaving the length field zero will verify the | |
187 | * given type fits, using it verifies minimum length | |
188 | * just like "All other" | |
189 | * All other Minimum length of attribute payload | |
a5531a5d | 190 | * |
bfa83a9e | 191 | * Example: |
b54452b0 | 192 | * static const struct nla_policy my_policy[ATTR_MAX+1] = { |
bfa83a9e | 193 | * [ATTR_FOO] = { .type = NLA_U16 }, |
d30045a0 | 194 | * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, |
a5531a5d | 195 | * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
bfa83a9e TG |
196 | * }; |
197 | */ | |
198 | struct nla_policy { | |
199 | u16 type; | |
a5531a5d | 200 | u16 len; |
bfa83a9e TG |
201 | }; |
202 | ||
4e902c57 TG |
203 | /** |
204 | * struct nl_info - netlink source information | |
205 | * @nlh: Netlink message header of original request | |
206 | * @pid: Netlink PID of requesting application | |
207 | */ | |
208 | struct nl_info { | |
209 | struct nlmsghdr *nlh; | |
4d1169c1 | 210 | struct net *nl_net; |
4e902c57 TG |
211 | u32 pid; |
212 | }; | |
213 | ||
cd40b7d3 DL |
214 | extern int netlink_rcv_skb(struct sk_buff *skb, |
215 | int (*cb)(struct sk_buff *, | |
216 | struct nlmsghdr *)); | |
97676b6b TG |
217 | extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb, |
218 | u32 pid, unsigned int group, int report, | |
219 | gfp_t flags); | |
82ace47a | 220 | |
3654654f JE |
221 | extern int nla_validate(const struct nlattr *head, |
222 | int len, int maxtype, | |
ef7c79ed | 223 | const struct nla_policy *policy); |
3654654f JE |
224 | extern int nla_parse(struct nlattr **tb, int maxtype, |
225 | const struct nlattr *head, int len, | |
ef7c79ed | 226 | const struct nla_policy *policy); |
e487eb99 | 227 | extern int nla_policy_len(const struct nla_policy *, int); |
3654654f JE |
228 | extern struct nlattr * nla_find(const struct nlattr *head, |
229 | int len, int attrtype); | |
bfa83a9e TG |
230 | extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, |
231 | size_t dstsize); | |
b057efd4 | 232 | extern int nla_memcpy(void *dest, const struct nlattr *src, int count); |
bfa83a9e TG |
233 | extern int nla_memcmp(const struct nlattr *nla, const void *data, |
234 | size_t size); | |
235 | extern int nla_strcmp(const struct nlattr *nla, const char *str); | |
236 | extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, | |
237 | int attrlen); | |
fe4944e5 | 238 | extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
bfa83a9e TG |
239 | extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, |
240 | int attrlen); | |
fe4944e5 | 241 | extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
bfa83a9e TG |
242 | extern void __nla_put(struct sk_buff *skb, int attrtype, |
243 | int attrlen, const void *data); | |
fe4944e5 TG |
244 | extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, |
245 | const void *data); | |
bfa83a9e TG |
246 | extern int nla_put(struct sk_buff *skb, int attrtype, |
247 | int attrlen, const void *data); | |
fe4944e5 TG |
248 | extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, |
249 | const void *data); | |
01480e1c PM |
250 | extern int nla_append(struct sk_buff *skb, int attrlen, |
251 | const void *data); | |
bfa83a9e TG |
252 | |
253 | /************************************************************************** | |
254 | * Netlink Messages | |
255 | **************************************************************************/ | |
256 | ||
257 | /** | |
258 | * nlmsg_msg_size - length of netlink message not including padding | |
259 | * @payload: length of message payload | |
260 | */ | |
261 | static inline int nlmsg_msg_size(int payload) | |
262 | { | |
263 | return NLMSG_HDRLEN + payload; | |
264 | } | |
265 | ||
266 | /** | |
267 | * nlmsg_total_size - length of netlink message including padding | |
268 | * @payload: length of message payload | |
269 | */ | |
270 | static inline int nlmsg_total_size(int payload) | |
271 | { | |
272 | return NLMSG_ALIGN(nlmsg_msg_size(payload)); | |
273 | } | |
274 | ||
275 | /** | |
276 | * nlmsg_padlen - length of padding at the message's tail | |
277 | * @payload: length of message payload | |
278 | */ | |
279 | static inline int nlmsg_padlen(int payload) | |
280 | { | |
281 | return nlmsg_total_size(payload) - nlmsg_msg_size(payload); | |
282 | } | |
283 | ||
284 | /** | |
285 | * nlmsg_data - head of message payload | |
70f23fd6 | 286 | * @nlh: netlink message header |
bfa83a9e TG |
287 | */ |
288 | static inline void *nlmsg_data(const struct nlmsghdr *nlh) | |
289 | { | |
290 | return (unsigned char *) nlh + NLMSG_HDRLEN; | |
291 | } | |
292 | ||
293 | /** | |
294 | * nlmsg_len - length of message payload | |
295 | * @nlh: netlink message header | |
296 | */ | |
297 | static inline int nlmsg_len(const struct nlmsghdr *nlh) | |
298 | { | |
299 | return nlh->nlmsg_len - NLMSG_HDRLEN; | |
300 | } | |
301 | ||
302 | /** | |
303 | * nlmsg_attrdata - head of attributes data | |
304 | * @nlh: netlink message header | |
305 | * @hdrlen: length of family specific header | |
306 | */ | |
307 | static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, | |
308 | int hdrlen) | |
309 | { | |
310 | unsigned char *data = nlmsg_data(nlh); | |
311 | return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); | |
312 | } | |
313 | ||
314 | /** | |
315 | * nlmsg_attrlen - length of attributes data | |
316 | * @nlh: netlink message header | |
317 | * @hdrlen: length of family specific header | |
318 | */ | |
319 | static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) | |
320 | { | |
321 | return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); | |
322 | } | |
323 | ||
324 | /** | |
325 | * nlmsg_ok - check if the netlink message fits into the remaining bytes | |
326 | * @nlh: netlink message header | |
327 | * @remaining: number of bytes remaining in message stream | |
328 | */ | |
329 | static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) | |
330 | { | |
619e803d | 331 | return (remaining >= (int) sizeof(struct nlmsghdr) && |
bfa83a9e TG |
332 | nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
333 | nlh->nlmsg_len <= remaining); | |
334 | } | |
335 | ||
336 | /** | |
337 | * nlmsg_next - next netlink message in message stream | |
338 | * @nlh: netlink message header | |
339 | * @remaining: number of bytes remaining in message stream | |
340 | * | |
341 | * Returns the next netlink message in the message stream and | |
342 | * decrements remaining by the size of the current message. | |
343 | */ | |
3654654f JE |
344 | static inline struct nlmsghdr * |
345 | nlmsg_next(const struct nlmsghdr *nlh, int *remaining) | |
bfa83a9e TG |
346 | { |
347 | int totlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
348 | ||
349 | *remaining -= totlen; | |
350 | ||
351 | return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); | |
352 | } | |
353 | ||
354 | /** | |
355 | * nlmsg_parse - parse attributes of a netlink message | |
356 | * @nlh: netlink message header | |
357 | * @hdrlen: length of family specific header | |
358 | * @tb: destination array with maxtype+1 elements | |
359 | * @maxtype: maximum attribute type to be expected | |
360 | * @policy: validation policy | |
361 | * | |
362 | * See nla_parse() | |
363 | */ | |
3a6c2b41 | 364 | static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, |
bfa83a9e | 365 | struct nlattr *tb[], int maxtype, |
ef7c79ed | 366 | const struct nla_policy *policy) |
bfa83a9e TG |
367 | { |
368 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
369 | return -EINVAL; | |
370 | ||
371 | return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), | |
372 | nlmsg_attrlen(nlh, hdrlen), policy); | |
373 | } | |
374 | ||
375 | /** | |
376 | * nlmsg_find_attr - find a specific attribute in a netlink message | |
377 | * @nlh: netlink message header | |
378 | * @hdrlen: length of familiy specific header | |
379 | * @attrtype: type of attribute to look for | |
380 | * | |
381 | * Returns the first attribute which matches the specified type. | |
382 | */ | |
6b8c92ba | 383 | static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, |
bfa83a9e TG |
384 | int hdrlen, int attrtype) |
385 | { | |
386 | return nla_find(nlmsg_attrdata(nlh, hdrlen), | |
387 | nlmsg_attrlen(nlh, hdrlen), attrtype); | |
388 | } | |
389 | ||
390 | /** | |
391 | * nlmsg_validate - validate a netlink message including attributes | |
392 | * @nlh: netlinket message header | |
393 | * @hdrlen: length of familiy specific header | |
394 | * @maxtype: maximum attribute type to be expected | |
395 | * @policy: validation policy | |
396 | */ | |
3654654f JE |
397 | static inline int nlmsg_validate(const struct nlmsghdr *nlh, |
398 | int hdrlen, int maxtype, | |
ef7c79ed | 399 | const struct nla_policy *policy) |
bfa83a9e TG |
400 | { |
401 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
402 | return -EINVAL; | |
403 | ||
404 | return nla_validate(nlmsg_attrdata(nlh, hdrlen), | |
405 | nlmsg_attrlen(nlh, hdrlen), maxtype, policy); | |
406 | } | |
407 | ||
97676b6b TG |
408 | /** |
409 | * nlmsg_report - need to report back to application? | |
410 | * @nlh: netlink message header | |
411 | * | |
412 | * Returns 1 if a report back to the application is requested. | |
413 | */ | |
3a6c2b41 | 414 | static inline int nlmsg_report(const struct nlmsghdr *nlh) |
97676b6b TG |
415 | { |
416 | return !!(nlh->nlmsg_flags & NLM_F_ECHO); | |
417 | } | |
418 | ||
bfa83a9e TG |
419 | /** |
420 | * nlmsg_for_each_attr - iterate over a stream of attributes | |
421 | * @pos: loop counter, set to current attribute | |
422 | * @nlh: netlink message header | |
423 | * @hdrlen: length of familiy specific header | |
424 | * @rem: initialized to len, holds bytes currently remaining in stream | |
425 | */ | |
426 | #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ | |
427 | nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ | |
428 | nlmsg_attrlen(nlh, hdrlen), rem) | |
429 | ||
bfa83a9e TG |
430 | /** |
431 | * nlmsg_put - Add a new netlink message to an skb | |
432 | * @skb: socket buffer to store message in | |
433 | * @pid: netlink process id | |
434 | * @seq: sequence number of message | |
435 | * @type: message type | |
436 | * @payload: length of message payload | |
437 | * @flags: message flags | |
438 | * | |
439 | * Returns NULL if the tailroom of the skb is insufficient to store | |
440 | * the message header and payload. | |
441 | */ | |
442 | static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, | |
443 | int type, int payload, int flags) | |
444 | { | |
445 | if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) | |
446 | return NULL; | |
447 | ||
448 | return __nlmsg_put(skb, pid, seq, type, payload, flags); | |
449 | } | |
450 | ||
451 | /** | |
452 | * nlmsg_put_answer - Add a new callback based netlink message to an skb | |
453 | * @skb: socket buffer to store message in | |
454 | * @cb: netlink callback | |
455 | * @type: message type | |
456 | * @payload: length of message payload | |
457 | * @flags: message flags | |
458 | * | |
459 | * Returns NULL if the tailroom of the skb is insufficient to store | |
460 | * the message header and payload. | |
461 | */ | |
462 | static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, | |
463 | struct netlink_callback *cb, | |
464 | int type, int payload, | |
465 | int flags) | |
466 | { | |
467 | return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
468 | type, payload, flags); | |
469 | } | |
470 | ||
471 | /** | |
472 | * nlmsg_new - Allocate a new netlink message | |
339bf98f | 473 | * @payload: size of the message payload |
fe4944e5 | 474 | * @flags: the type of memory to allocate. |
bfa83a9e | 475 | * |
339bf98f TG |
476 | * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
477 | * and a good default is needed. | |
bfa83a9e | 478 | */ |
339bf98f | 479 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
bfa83a9e | 480 | { |
339bf98f | 481 | return alloc_skb(nlmsg_total_size(payload), flags); |
bfa83a9e TG |
482 | } |
483 | ||
484 | /** | |
485 | * nlmsg_end - Finalize a netlink message | |
486 | * @skb: socket buffer the message is stored in | |
487 | * @nlh: netlink message header | |
488 | * | |
489 | * Corrects the netlink message header to include the appeneded | |
490 | * attributes. Only necessary if attributes have been added to | |
491 | * the message. | |
492 | * | |
493 | * Returns the total data length of the skb. | |
494 | */ | |
495 | static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) | |
496 | { | |
27a884dc | 497 | nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
bfa83a9e TG |
498 | |
499 | return skb->len; | |
500 | } | |
501 | ||
fe4944e5 TG |
502 | /** |
503 | * 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 | */ | |
508 | static inline void *nlmsg_get_pos(struct sk_buff *skb) | |
509 | { | |
27a884dc | 510 | return skb_tail_pointer(skb); |
fe4944e5 TG |
511 | } |
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 | * | |
bc3ed28c | 518 | * Trims the message to the provided mark. |
fe4944e5 | 519 | */ |
bc3ed28c | 520 | static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) |
fe4944e5 TG |
521 | { |
522 | if (mark) | |
523 | skb_trim(skb, (unsigned char *) mark - skb->data); | |
fe4944e5 TG |
524 | } |
525 | ||
bfa83a9e TG |
526 | /** |
527 | * nlmsg_cancel - Cancel construction of a netlink message | |
528 | * @skb: socket buffer the message is stored in | |
529 | * @nlh: netlink message header | |
530 | * | |
531 | * Removes the complete netlink message including all | |
bc3ed28c | 532 | * attributes from the socket buffer again. |
bfa83a9e | 533 | */ |
bc3ed28c | 534 | static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 535 | { |
bc3ed28c | 536 | nlmsg_trim(skb, nlh); |
bfa83a9e TG |
537 | } |
538 | ||
539 | /** | |
540 | * nlmsg_free - free a netlink message | |
541 | * @skb: socket buffer of netlink message | |
542 | */ | |
543 | static inline void nlmsg_free(struct sk_buff *skb) | |
544 | { | |
545 | kfree_skb(skb); | |
546 | } | |
547 | ||
548 | /** | |
549 | * nlmsg_multicast - multicast a netlink message | |
550 | * @sk: netlink socket to spread messages to | |
551 | * @skb: netlink message as socket buffer | |
552 | * @pid: own netlink pid to avoid sending to yourself | |
553 | * @group: multicast group id | |
d387f6ad | 554 | * @flags: allocation flags |
bfa83a9e TG |
555 | */ |
556 | static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, | |
d387f6ad | 557 | u32 pid, unsigned int group, gfp_t flags) |
bfa83a9e TG |
558 | { |
559 | int err; | |
560 | ||
561 | NETLINK_CB(skb).dst_group = group; | |
562 | ||
d387f6ad | 563 | err = netlink_broadcast(sk, skb, pid, group, flags); |
bfa83a9e TG |
564 | if (err > 0) |
565 | err = 0; | |
566 | ||
567 | return err; | |
568 | } | |
569 | ||
570 | /** | |
571 | * nlmsg_unicast - unicast a netlink message | |
572 | * @sk: netlink socket to spread message to | |
573 | * @skb: netlink message as socket buffer | |
574 | * @pid: netlink pid of the destination socket | |
575 | */ | |
576 | static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) | |
577 | { | |
578 | int err; | |
579 | ||
580 | err = netlink_unicast(sk, skb, pid, MSG_DONTWAIT); | |
581 | if (err > 0) | |
582 | err = 0; | |
583 | ||
584 | return err; | |
585 | } | |
586 | ||
587 | /** | |
588 | * nlmsg_for_each_msg - iterate over a stream of messages | |
589 | * @pos: loop counter, set to current message | |
590 | * @head: head of message stream | |
591 | * @len: length of message stream | |
592 | * @rem: initialized to len, holds bytes currently remaining in stream | |
593 | */ | |
594 | #define nlmsg_for_each_msg(pos, head, len, rem) \ | |
595 | for (pos = head, rem = len; \ | |
596 | nlmsg_ok(pos, rem); \ | |
597 | pos = nlmsg_next(pos, &(rem))) | |
598 | ||
670dc283 JB |
599 | /** |
600 | * nl_dump_check_consistent - check if sequence is consistent and advertise if not | |
601 | * @cb: netlink callback structure that stores the sequence number | |
602 | * @nlh: netlink message header to write the flag to | |
603 | * | |
604 | * This function checks if the sequence (generation) number changed during dump | |
605 | * and if it did, advertises it in the netlink message header. | |
606 | * | |
607 | * The correct way to use it is to set cb->seq to the generation counter when | |
608 | * all locks for dumping have been acquired, and then call this function for | |
609 | * each message that is generated. | |
610 | * | |
611 | * Note that due to initialisation concerns, 0 is an invalid sequence number | |
612 | * and must not be used by code that uses this functionality. | |
613 | */ | |
614 | static inline void | |
615 | nl_dump_check_consistent(struct netlink_callback *cb, | |
616 | struct nlmsghdr *nlh) | |
617 | { | |
618 | if (cb->prev_seq && cb->seq != cb->prev_seq) | |
619 | nlh->nlmsg_flags |= NLM_F_DUMP_INTR; | |
620 | cb->prev_seq = cb->seq; | |
621 | } | |
622 | ||
bfa83a9e TG |
623 | /************************************************************************** |
624 | * Netlink Attributes | |
625 | **************************************************************************/ | |
626 | ||
627 | /** | |
628 | * nla_attr_size - length of attribute not including padding | |
629 | * @payload: length of payload | |
630 | */ | |
631 | static inline int nla_attr_size(int payload) | |
632 | { | |
633 | return NLA_HDRLEN + payload; | |
634 | } | |
635 | ||
636 | /** | |
637 | * nla_total_size - total length of attribute including padding | |
638 | * @payload: length of payload | |
639 | */ | |
640 | static inline int nla_total_size(int payload) | |
641 | { | |
642 | return NLA_ALIGN(nla_attr_size(payload)); | |
643 | } | |
644 | ||
645 | /** | |
646 | * nla_padlen - length of padding at the tail of attribute | |
647 | * @payload: length of payload | |
648 | */ | |
649 | static inline int nla_padlen(int payload) | |
650 | { | |
651 | return nla_total_size(payload) - nla_attr_size(payload); | |
652 | } | |
653 | ||
8f4c1f9b TG |
654 | /** |
655 | * nla_type - attribute type | |
656 | * @nla: netlink attribute | |
657 | */ | |
658 | static inline int nla_type(const struct nlattr *nla) | |
659 | { | |
660 | return nla->nla_type & NLA_TYPE_MASK; | |
661 | } | |
662 | ||
bfa83a9e TG |
663 | /** |
664 | * nla_data - head of payload | |
665 | * @nla: netlink attribute | |
666 | */ | |
667 | static inline void *nla_data(const struct nlattr *nla) | |
668 | { | |
669 | return (char *) nla + NLA_HDRLEN; | |
670 | } | |
671 | ||
672 | /** | |
673 | * nla_len - length of payload | |
674 | * @nla: netlink attribute | |
675 | */ | |
676 | static inline int nla_len(const struct nlattr *nla) | |
677 | { | |
678 | return nla->nla_len - NLA_HDRLEN; | |
679 | } | |
680 | ||
681 | /** | |
682 | * nla_ok - check if the netlink attribute fits into the remaining bytes | |
683 | * @nla: netlink attribute | |
684 | * @remaining: number of bytes remaining in attribute stream | |
685 | */ | |
686 | static inline int nla_ok(const struct nlattr *nla, int remaining) | |
687 | { | |
1045b03e | 688 | return remaining >= (int) sizeof(*nla) && |
bfa83a9e TG |
689 | nla->nla_len >= sizeof(*nla) && |
690 | nla->nla_len <= remaining; | |
691 | } | |
692 | ||
693 | /** | |
d1ec3b77 | 694 | * nla_next - next netlink attribute in attribute stream |
bfa83a9e TG |
695 | * @nla: netlink attribute |
696 | * @remaining: number of bytes remaining in attribute stream | |
697 | * | |
698 | * Returns the next netlink attribute in the attribute stream and | |
699 | * decrements remaining by the size of the current attribute. | |
700 | */ | |
701 | static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) | |
702 | { | |
703 | int totlen = NLA_ALIGN(nla->nla_len); | |
704 | ||
705 | *remaining -= totlen; | |
706 | return (struct nlattr *) ((char *) nla + totlen); | |
707 | } | |
708 | ||
fe4944e5 TG |
709 | /** |
710 | * nla_find_nested - find attribute in a set of nested attributes | |
711 | * @nla: attribute containing the nested attributes | |
712 | * @attrtype: type of attribute to look for | |
713 | * | |
714 | * Returns the first attribute which matches the specified type. | |
715 | */ | |
3654654f JE |
716 | static inline struct nlattr * |
717 | nla_find_nested(const struct nlattr *nla, int attrtype) | |
fe4944e5 TG |
718 | { |
719 | return nla_find(nla_data(nla), nla_len(nla), attrtype); | |
720 | } | |
721 | ||
bfa83a9e TG |
722 | /** |
723 | * nla_parse_nested - parse nested attributes | |
724 | * @tb: destination array with maxtype+1 elements | |
725 | * @maxtype: maximum attribute type to be expected | |
726 | * @nla: attribute containing the nested attributes | |
727 | * @policy: validation policy | |
728 | * | |
729 | * See nla_parse() | |
730 | */ | |
731 | static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, | |
b057efd4 | 732 | const struct nlattr *nla, |
ef7c79ed | 733 | const struct nla_policy *policy) |
bfa83a9e TG |
734 | { |
735 | return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); | |
736 | } | |
1092cb21 | 737 | |
bfa83a9e | 738 | /** |
d1ec3b77 | 739 | * nla_put_u8 - Add a u8 netlink attribute to a socket buffer |
bfa83a9e TG |
740 | * @skb: socket buffer to add attribute to |
741 | * @attrtype: attribute type | |
742 | * @value: numeric value | |
743 | */ | |
744 | static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) | |
745 | { | |
746 | return nla_put(skb, attrtype, sizeof(u8), &value); | |
747 | } | |
748 | ||
749 | /** | |
750 | * nla_put_u16 - Add a u16 netlink attribute to a socket buffer | |
751 | * @skb: socket buffer to add attribute to | |
752 | * @attrtype: attribute type | |
753 | * @value: numeric value | |
754 | */ | |
755 | static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) | |
756 | { | |
757 | return nla_put(skb, attrtype, sizeof(u16), &value); | |
758 | } | |
759 | ||
569a8fc3 DM |
760 | /** |
761 | * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer | |
762 | * @skb: socket buffer to add attribute to | |
763 | * @attrtype: attribute type | |
764 | * @value: numeric value | |
765 | */ | |
766 | static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) | |
767 | { | |
768 | return nla_put(skb, attrtype, sizeof(__be16), &value); | |
769 | } | |
770 | ||
6c1dd3b6 DM |
771 | /** |
772 | * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer | |
773 | * @skb: socket buffer to add attribute to | |
774 | * @attrtype: attribute type | |
775 | * @value: numeric value | |
776 | */ | |
777 | static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) | |
778 | { | |
779 | return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
780 | } | |
781 | ||
24c410dc DM |
782 | /** |
783 | * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer | |
784 | * @skb: socket buffer to add attribute to | |
785 | * @attrtype: attribute type | |
786 | * @value: numeric value | |
787 | */ | |
788 | static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) | |
789 | { | |
790 | return nla_put(skb, attrtype, sizeof(__le16), &value); | |
791 | } | |
792 | ||
bfa83a9e TG |
793 | /** |
794 | * nla_put_u32 - Add a u32 netlink attribute to a socket buffer | |
795 | * @skb: socket buffer to add attribute to | |
796 | * @attrtype: attribute type | |
797 | * @value: numeric value | |
798 | */ | |
799 | static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) | |
800 | { | |
801 | return nla_put(skb, attrtype, sizeof(u32), &value); | |
802 | } | |
803 | ||
804 | /** | |
569a8fc3 DM |
805 | * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer |
806 | * @skb: socket buffer to add attribute to | |
807 | * @attrtype: attribute type | |
808 | * @value: numeric value | |
809 | */ | |
810 | static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) | |
811 | { | |
812 | return nla_put(skb, attrtype, sizeof(__be32), &value); | |
813 | } | |
814 | ||
6c1dd3b6 DM |
815 | /** |
816 | * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer | |
817 | * @skb: socket buffer to add attribute to | |
818 | * @attrtype: attribute type | |
819 | * @value: numeric value | |
820 | */ | |
821 | static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) | |
822 | { | |
823 | return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
824 | } | |
825 | ||
24c410dc DM |
826 | /** |
827 | * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer | |
828 | * @skb: socket buffer to add attribute to | |
829 | * @attrtype: attribute type | |
830 | * @value: numeric value | |
831 | */ | |
832 | static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) | |
833 | { | |
834 | return nla_put(skb, attrtype, sizeof(__le32), &value); | |
835 | } | |
836 | ||
569a8fc3 DM |
837 | /** |
838 | * nla_put_u64 - Add a u64 netlink attribute to a socket buffer | |
bfa83a9e TG |
839 | * @skb: socket buffer to add attribute to |
840 | * @attrtype: attribute type | |
841 | * @value: numeric value | |
842 | */ | |
843 | static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) | |
844 | { | |
845 | return nla_put(skb, attrtype, sizeof(u64), &value); | |
846 | } | |
847 | ||
569a8fc3 DM |
848 | /** |
849 | * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer | |
850 | * @skb: socket buffer to add attribute to | |
851 | * @attrtype: attribute type | |
852 | * @value: numeric value | |
853 | */ | |
854 | static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value) | |
855 | { | |
856 | return nla_put(skb, attrtype, sizeof(__be64), &value); | |
857 | } | |
858 | ||
6c1dd3b6 DM |
859 | /** |
860 | * nla_put_net64 - Add 64-bit network byte order netlink attribute to a socket buffer | |
861 | * @skb: socket buffer to add attribute to | |
862 | * @attrtype: attribute type | |
863 | * @value: numeric value | |
864 | */ | |
865 | static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value) | |
866 | { | |
867 | return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
868 | } | |
869 | ||
24c410dc DM |
870 | /** |
871 | * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer | |
872 | * @skb: socket buffer to add attribute to | |
873 | * @attrtype: attribute type | |
874 | * @value: numeric value | |
875 | */ | |
876 | static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value) | |
877 | { | |
878 | return nla_put(skb, attrtype, sizeof(__le64), &value); | |
879 | } | |
880 | ||
bfa83a9e TG |
881 | /** |
882 | * nla_put_string - Add a string netlink attribute to a socket buffer | |
883 | * @skb: socket buffer to add attribute to | |
884 | * @attrtype: attribute type | |
885 | * @str: NUL terminated string | |
886 | */ | |
887 | static inline int nla_put_string(struct sk_buff *skb, int attrtype, | |
888 | const char *str) | |
889 | { | |
890 | return nla_put(skb, attrtype, strlen(str) + 1, str); | |
891 | } | |
892 | ||
893 | /** | |
894 | * nla_put_flag - Add a flag netlink attribute to a socket buffer | |
895 | * @skb: socket buffer to add attribute to | |
896 | * @attrtype: attribute type | |
897 | */ | |
898 | static inline int nla_put_flag(struct sk_buff *skb, int attrtype) | |
899 | { | |
900 | return nla_put(skb, attrtype, 0, NULL); | |
901 | } | |
902 | ||
903 | /** | |
904 | * nla_put_msecs - Add a msecs netlink attribute to a socket buffer | |
905 | * @skb: socket buffer to add attribute to | |
906 | * @attrtype: attribute type | |
907 | * @jiffies: number of msecs in jiffies | |
908 | */ | |
909 | static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, | |
910 | unsigned long jiffies) | |
911 | { | |
912 | u64 tmp = jiffies_to_msecs(jiffies); | |
913 | return nla_put(skb, attrtype, sizeof(u64), &tmp); | |
914 | } | |
915 | ||
bfa83a9e TG |
916 | /** |
917 | * nla_get_u32 - return payload of u32 attribute | |
918 | * @nla: u32 netlink attribute | |
919 | */ | |
b057efd4 | 920 | static inline u32 nla_get_u32(const struct nlattr *nla) |
bfa83a9e TG |
921 | { |
922 | return *(u32 *) nla_data(nla); | |
923 | } | |
924 | ||
00012e5b AV |
925 | /** |
926 | * nla_get_be32 - return payload of __be32 attribute | |
927 | * @nla: __be32 netlink attribute | |
928 | */ | |
b057efd4 | 929 | static inline __be32 nla_get_be32(const struct nlattr *nla) |
00012e5b AV |
930 | { |
931 | return *(__be32 *) nla_data(nla); | |
932 | } | |
933 | ||
bfa83a9e TG |
934 | /** |
935 | * nla_get_u16 - return payload of u16 attribute | |
936 | * @nla: u16 netlink attribute | |
937 | */ | |
b057efd4 | 938 | static inline u16 nla_get_u16(const struct nlattr *nla) |
bfa83a9e TG |
939 | { |
940 | return *(u16 *) nla_data(nla); | |
941 | } | |
942 | ||
838965ba PM |
943 | /** |
944 | * nla_get_be16 - return payload of __be16 attribute | |
945 | * @nla: __be16 netlink attribute | |
946 | */ | |
b057efd4 | 947 | static inline __be16 nla_get_be16(const struct nlattr *nla) |
838965ba PM |
948 | { |
949 | return *(__be16 *) nla_data(nla); | |
950 | } | |
951 | ||
4a89c256 TG |
952 | /** |
953 | * nla_get_le16 - return payload of __le16 attribute | |
954 | * @nla: __le16 netlink attribute | |
955 | */ | |
b057efd4 | 956 | static inline __le16 nla_get_le16(const struct nlattr *nla) |
4a89c256 TG |
957 | { |
958 | return *(__le16 *) nla_data(nla); | |
959 | } | |
960 | ||
bfa83a9e TG |
961 | /** |
962 | * nla_get_u8 - return payload of u8 attribute | |
963 | * @nla: u8 netlink attribute | |
964 | */ | |
b057efd4 | 965 | static inline u8 nla_get_u8(const struct nlattr *nla) |
bfa83a9e TG |
966 | { |
967 | return *(u8 *) nla_data(nla); | |
968 | } | |
969 | ||
970 | /** | |
971 | * nla_get_u64 - return payload of u64 attribute | |
972 | * @nla: u64 netlink attribute | |
973 | */ | |
b057efd4 | 974 | static inline u64 nla_get_u64(const struct nlattr *nla) |
bfa83a9e TG |
975 | { |
976 | u64 tmp; | |
977 | ||
978 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
979 | ||
980 | return tmp; | |
981 | } | |
982 | ||
a17c8598 PNA |
983 | /** |
984 | * nla_get_be64 - return payload of __be64 attribute | |
985 | * @nla: __be64 netlink attribute | |
986 | */ | |
987 | static inline __be64 nla_get_be64(const struct nlattr *nla) | |
988 | { | |
f5d410f2 PNA |
989 | __be64 tmp; |
990 | ||
991 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
992 | ||
993 | return tmp; | |
a17c8598 PNA |
994 | } |
995 | ||
bfa83a9e TG |
996 | /** |
997 | * nla_get_flag - return payload of flag attribute | |
998 | * @nla: flag netlink attribute | |
999 | */ | |
b057efd4 | 1000 | static inline int nla_get_flag(const struct nlattr *nla) |
bfa83a9e TG |
1001 | { |
1002 | return !!nla; | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * nla_get_msecs - return payload of msecs attribute | |
1007 | * @nla: msecs netlink attribute | |
1008 | * | |
1009 | * Returns the number of milliseconds in jiffies. | |
1010 | */ | |
b057efd4 | 1011 | static inline unsigned long nla_get_msecs(const struct nlattr *nla) |
bfa83a9e TG |
1012 | { |
1013 | u64 msecs = nla_get_u64(nla); | |
1014 | ||
1015 | return msecs_to_jiffies((unsigned long) msecs); | |
1016 | } | |
1017 | ||
1018 | /** | |
1019 | * nla_nest_start - Start a new level of nested attributes | |
1020 | * @skb: socket buffer to add attributes to | |
1021 | * @attrtype: attribute type of container | |
1022 | * | |
1023 | * Returns the container attribute | |
1024 | */ | |
1025 | static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) | |
1026 | { | |
27a884dc | 1027 | struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
bfa83a9e TG |
1028 | |
1029 | if (nla_put(skb, attrtype, 0, NULL) < 0) | |
1030 | return NULL; | |
1031 | ||
1032 | return start; | |
1033 | } | |
1034 | ||
1035 | /** | |
1036 | * nla_nest_end - Finalize nesting of attributes | |
d1ec3b77 | 1037 | * @skb: socket buffer the attributes are stored in |
bfa83a9e TG |
1038 | * @start: container attribute |
1039 | * | |
1040 | * Corrects the container attribute header to include the all | |
1041 | * appeneded attributes. | |
1042 | * | |
1043 | * Returns the total data length of the skb. | |
1044 | */ | |
1045 | static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) | |
1046 | { | |
27a884dc | 1047 | start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
bfa83a9e TG |
1048 | return skb->len; |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * nla_nest_cancel - Cancel nesting of attributes | |
1053 | * @skb: socket buffer the message is stored in | |
1054 | * @start: container attribute | |
1055 | * | |
1056 | * Removes the container attribute and including all nested | |
bc3ed28c | 1057 | * attributes. Returns -EMSGSIZE |
bfa83a9e | 1058 | */ |
bc3ed28c | 1059 | static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
bfa83a9e | 1060 | { |
bc3ed28c | 1061 | nlmsg_trim(skb, start); |
bfa83a9e TG |
1062 | } |
1063 | ||
4fe5d5c0 PM |
1064 | /** |
1065 | * nla_validate_nested - Validate a stream of nested attributes | |
1066 | * @start: container attribute | |
1067 | * @maxtype: maximum attribute type to be expected | |
1068 | * @policy: validation policy | |
1069 | * | |
1070 | * Validates all attributes in the nested attribute stream against the | |
1071 | * specified policy. Attributes with a type exceeding maxtype will be | |
1072 | * ignored. See documenation of struct nla_policy for more details. | |
1073 | * | |
1074 | * Returns 0 on success or a negative error code. | |
1075 | */ | |
3654654f | 1076 | static inline int nla_validate_nested(const struct nlattr *start, int maxtype, |
ef7c79ed | 1077 | const struct nla_policy *policy) |
4fe5d5c0 PM |
1078 | { |
1079 | return nla_validate(nla_data(start), nla_len(start), maxtype, policy); | |
1080 | } | |
1081 | ||
bfa83a9e TG |
1082 | /** |
1083 | * nla_for_each_attr - iterate over a stream of attributes | |
1084 | * @pos: loop counter, set to current attribute | |
1085 | * @head: head of attribute stream | |
1086 | * @len: length of attribute stream | |
1087 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1088 | */ | |
1089 | #define nla_for_each_attr(pos, head, len, rem) \ | |
1090 | for (pos = head, rem = len; \ | |
1091 | nla_ok(pos, rem); \ | |
1092 | pos = nla_next(pos, &(rem))) | |
1093 | ||
fe4944e5 TG |
1094 | /** |
1095 | * nla_for_each_nested - iterate over nested attributes | |
1096 | * @pos: loop counter, set to current attribute | |
1097 | * @nla: attribute containing the nested attributes | |
1098 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1099 | */ | |
1100 | #define nla_for_each_nested(pos, nla, rem) \ | |
1101 | nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) | |
1102 | ||
bfa83a9e | 1103 | #endif |