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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 | * | |
105 | * Exceptions Based Attribute Construction: | |
106 | * NLA_PUT(skb, type, len, data) add attribute to skb | |
107 | * NLA_PUT_U8(skb, type, value) add u8 attribute to skb | |
108 | * NLA_PUT_U16(skb, type, value) add u16 attribute to skb | |
109 | * NLA_PUT_U32(skb, type, value) add u32 attribute to skb | |
110 | * NLA_PUT_U64(skb, type, value) add u64 attribute to skb | |
111 | * NLA_PUT_STRING(skb, type, str) add string attribute to skb | |
112 | * NLA_PUT_FLAG(skb, type) add flag attribute to skb | |
113 | * NLA_PUT_MSECS(skb, type, jiffies) add msecs attribute to skb | |
114 | * | |
115 | * The meaning of these functions is equal to their lower case | |
116 | * variants but they jump to the label nla_put_failure in case | |
117 | * of a failure. | |
118 | * | |
119 | * Nested Attributes Construction: | |
120 | * nla_nest_start(skb, type) start a nested attribute | |
121 | * nla_nest_end(skb, nla) finalize a nested attribute | |
122 | * nla_nest_cancel(skb, nla) cancel nested attribute construction | |
123 | * | |
124 | * Attribute Length Calculations: | |
125 | * nla_attr_size(payload) length of attribute w/o padding | |
126 | * nla_total_size(payload) length of attribute w/ padding | |
127 | * nla_padlen(payload) length of padding | |
128 | * | |
129 | * Attribute Payload Access: | |
130 | * nla_data(nla) head of attribute payload | |
131 | * nla_len(nla) length of attribute payload | |
132 | * | |
133 | * Attribute Payload Access for Basic Types: | |
134 | * nla_get_u8(nla) get payload for a u8 attribute | |
135 | * nla_get_u16(nla) get payload for a u16 attribute | |
136 | * nla_get_u32(nla) get payload for a u32 attribute | |
137 | * nla_get_u64(nla) get payload for a u64 attribute | |
138 | * nla_get_flag(nla) return 1 if flag is true | |
139 | * nla_get_msecs(nla) get payload for a msecs attribute | |
140 | * | |
141 | * Attribute Misc: | |
142 | * nla_memcpy(dest, nla, count) copy attribute into memory | |
143 | * nla_memcmp(nla, data, size) compare attribute with memory area | |
144 | * nla_strlcpy(dst, nla, size) copy attribute to a sized string | |
145 | * nla_strcmp(nla, str) compare attribute with string | |
146 | * | |
147 | * Attribute Parsing: | |
148 | * nla_ok(nla, remaining) does nla fit into remaining bytes? | |
149 | * nla_next(nla, remaining) get next netlink attribute | |
150 | * nla_validate() validate a stream of attributes | |
4fe5d5c0 | 151 | * nla_validate_nested() validate a stream of nested attributes |
bfa83a9e | 152 | * nla_find() find attribute in stream of attributes |
fe4944e5 | 153 | * nla_find_nested() find attribute in nested attributes |
bfa83a9e TG |
154 | * nla_parse() parse and validate stream of attrs |
155 | * nla_parse_nested() parse nested attribuets | |
156 | * nla_for_each_attr() loop over all attributes | |
22acb19a | 157 | * nla_for_each_nested() loop over the nested attributes |
bfa83a9e TG |
158 | *========================================================================= |
159 | */ | |
160 | ||
161 | /** | |
162 | * Standard attribute types to specify validation policy | |
163 | */ | |
164 | enum { | |
165 | NLA_UNSPEC, | |
166 | NLA_U8, | |
167 | NLA_U16, | |
168 | NLA_U32, | |
169 | NLA_U64, | |
170 | NLA_STRING, | |
171 | NLA_FLAG, | |
172 | NLA_MSECS, | |
173 | NLA_NESTED, | |
1092cb21 | 174 | NLA_NESTED_COMPAT, |
a5531a5d | 175 | NLA_NUL_STRING, |
d30045a0 | 176 | NLA_BINARY, |
bfa83a9e TG |
177 | __NLA_TYPE_MAX, |
178 | }; | |
179 | ||
180 | #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) | |
181 | ||
182 | /** | |
183 | * struct nla_policy - attribute validation policy | |
184 | * @type: Type of attribute or NLA_UNSPEC | |
a5531a5d | 185 | * @len: Type specific length of payload |
bfa83a9e TG |
186 | * |
187 | * Policies are defined as arrays of this struct, the array must be | |
188 | * accessible by attribute type up to the highest identifier to be expected. | |
189 | * | |
a5531a5d TG |
190 | * Meaning of `len' field: |
191 | * NLA_STRING Maximum length of string | |
192 | * NLA_NUL_STRING Maximum length of string (excluding NUL) | |
193 | * NLA_FLAG Unused | |
d30045a0 | 194 | * NLA_BINARY Maximum length of attribute payload |
1092cb21 | 195 | * NLA_NESTED_COMPAT Exact length of structure payload |
a5531a5d TG |
196 | * All other Exact length of attribute payload |
197 | * | |
bfa83a9e | 198 | * Example: |
b54452b0 | 199 | * static const struct nla_policy my_policy[ATTR_MAX+1] = { |
bfa83a9e | 200 | * [ATTR_FOO] = { .type = NLA_U16 }, |
d30045a0 | 201 | * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, |
a5531a5d | 202 | * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
bfa83a9e TG |
203 | * }; |
204 | */ | |
205 | struct nla_policy { | |
206 | u16 type; | |
a5531a5d | 207 | u16 len; |
bfa83a9e TG |
208 | }; |
209 | ||
4e902c57 TG |
210 | /** |
211 | * struct nl_info - netlink source information | |
212 | * @nlh: Netlink message header of original request | |
213 | * @pid: Netlink PID of requesting application | |
214 | */ | |
215 | struct nl_info { | |
216 | struct nlmsghdr *nlh; | |
4d1169c1 | 217 | struct net *nl_net; |
4e902c57 TG |
218 | u32 pid; |
219 | }; | |
220 | ||
cd40b7d3 DL |
221 | extern int netlink_rcv_skb(struct sk_buff *skb, |
222 | int (*cb)(struct sk_buff *, | |
223 | struct nlmsghdr *)); | |
97676b6b TG |
224 | extern int nlmsg_notify(struct sock *sk, struct sk_buff *skb, |
225 | u32 pid, unsigned int group, int report, | |
226 | gfp_t flags); | |
82ace47a | 227 | |
3654654f JE |
228 | extern int nla_validate(const struct nlattr *head, |
229 | int len, int maxtype, | |
ef7c79ed | 230 | const struct nla_policy *policy); |
3654654f JE |
231 | extern int nla_parse(struct nlattr **tb, int maxtype, |
232 | const struct nlattr *head, int len, | |
ef7c79ed | 233 | const struct nla_policy *policy); |
e487eb99 | 234 | extern int nla_policy_len(const struct nla_policy *, int); |
3654654f JE |
235 | extern struct nlattr * nla_find(const struct nlattr *head, |
236 | int len, int attrtype); | |
bfa83a9e TG |
237 | extern size_t nla_strlcpy(char *dst, const struct nlattr *nla, |
238 | size_t dstsize); | |
b057efd4 | 239 | extern int nla_memcpy(void *dest, const struct nlattr *src, int count); |
bfa83a9e TG |
240 | extern int nla_memcmp(const struct nlattr *nla, const void *data, |
241 | size_t size); | |
242 | extern int nla_strcmp(const struct nlattr *nla, const char *str); | |
243 | extern struct nlattr * __nla_reserve(struct sk_buff *skb, int attrtype, | |
244 | int attrlen); | |
fe4944e5 | 245 | extern void * __nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
bfa83a9e TG |
246 | extern struct nlattr * nla_reserve(struct sk_buff *skb, int attrtype, |
247 | int attrlen); | |
fe4944e5 | 248 | extern void * nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
bfa83a9e TG |
249 | extern void __nla_put(struct sk_buff *skb, int attrtype, |
250 | int attrlen, const void *data); | |
fe4944e5 TG |
251 | extern void __nla_put_nohdr(struct sk_buff *skb, int attrlen, |
252 | const void *data); | |
bfa83a9e TG |
253 | extern int nla_put(struct sk_buff *skb, int attrtype, |
254 | int attrlen, const void *data); | |
fe4944e5 TG |
255 | extern int nla_put_nohdr(struct sk_buff *skb, int attrlen, |
256 | const void *data); | |
01480e1c PM |
257 | extern int nla_append(struct sk_buff *skb, int attrlen, |
258 | const void *data); | |
bfa83a9e TG |
259 | |
260 | /************************************************************************** | |
261 | * Netlink Messages | |
262 | **************************************************************************/ | |
263 | ||
264 | /** | |
265 | * nlmsg_msg_size - length of netlink message not including padding | |
266 | * @payload: length of message payload | |
267 | */ | |
268 | static inline int nlmsg_msg_size(int payload) | |
269 | { | |
270 | return NLMSG_HDRLEN + payload; | |
271 | } | |
272 | ||
273 | /** | |
274 | * nlmsg_total_size - length of netlink message including padding | |
275 | * @payload: length of message payload | |
276 | */ | |
277 | static inline int nlmsg_total_size(int payload) | |
278 | { | |
279 | return NLMSG_ALIGN(nlmsg_msg_size(payload)); | |
280 | } | |
281 | ||
282 | /** | |
283 | * nlmsg_padlen - length of padding at the message's tail | |
284 | * @payload: length of message payload | |
285 | */ | |
286 | static inline int nlmsg_padlen(int payload) | |
287 | { | |
288 | return nlmsg_total_size(payload) - nlmsg_msg_size(payload); | |
289 | } | |
290 | ||
291 | /** | |
292 | * nlmsg_data - head of message payload | |
70f23fd6 | 293 | * @nlh: netlink message header |
bfa83a9e TG |
294 | */ |
295 | static inline void *nlmsg_data(const struct nlmsghdr *nlh) | |
296 | { | |
297 | return (unsigned char *) nlh + NLMSG_HDRLEN; | |
298 | } | |
299 | ||
300 | /** | |
301 | * nlmsg_len - length of message payload | |
302 | * @nlh: netlink message header | |
303 | */ | |
304 | static inline int nlmsg_len(const struct nlmsghdr *nlh) | |
305 | { | |
306 | return nlh->nlmsg_len - NLMSG_HDRLEN; | |
307 | } | |
308 | ||
309 | /** | |
310 | * nlmsg_attrdata - head of attributes data | |
311 | * @nlh: netlink message header | |
312 | * @hdrlen: length of family specific header | |
313 | */ | |
314 | static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, | |
315 | int hdrlen) | |
316 | { | |
317 | unsigned char *data = nlmsg_data(nlh); | |
318 | return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); | |
319 | } | |
320 | ||
321 | /** | |
322 | * nlmsg_attrlen - length of attributes data | |
323 | * @nlh: netlink message header | |
324 | * @hdrlen: length of family specific header | |
325 | */ | |
326 | static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) | |
327 | { | |
328 | return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); | |
329 | } | |
330 | ||
331 | /** | |
332 | * nlmsg_ok - check if the netlink message fits into the remaining bytes | |
333 | * @nlh: netlink message header | |
334 | * @remaining: number of bytes remaining in message stream | |
335 | */ | |
336 | static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) | |
337 | { | |
619e803d | 338 | return (remaining >= (int) sizeof(struct nlmsghdr) && |
bfa83a9e TG |
339 | nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
340 | nlh->nlmsg_len <= remaining); | |
341 | } | |
342 | ||
343 | /** | |
344 | * nlmsg_next - next netlink message in message stream | |
345 | * @nlh: netlink message header | |
346 | * @remaining: number of bytes remaining in message stream | |
347 | * | |
348 | * Returns the next netlink message in the message stream and | |
349 | * decrements remaining by the size of the current message. | |
350 | */ | |
3654654f JE |
351 | static inline struct nlmsghdr * |
352 | nlmsg_next(const struct nlmsghdr *nlh, int *remaining) | |
bfa83a9e TG |
353 | { |
354 | int totlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
355 | ||
356 | *remaining -= totlen; | |
357 | ||
358 | return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); | |
359 | } | |
360 | ||
361 | /** | |
362 | * nlmsg_parse - parse attributes of a netlink message | |
363 | * @nlh: netlink message header | |
364 | * @hdrlen: length of family specific header | |
365 | * @tb: destination array with maxtype+1 elements | |
366 | * @maxtype: maximum attribute type to be expected | |
367 | * @policy: validation policy | |
368 | * | |
369 | * See nla_parse() | |
370 | */ | |
3a6c2b41 | 371 | static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, |
bfa83a9e | 372 | struct nlattr *tb[], int maxtype, |
ef7c79ed | 373 | const struct nla_policy *policy) |
bfa83a9e TG |
374 | { |
375 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
376 | return -EINVAL; | |
377 | ||
378 | return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), | |
379 | nlmsg_attrlen(nlh, hdrlen), policy); | |
380 | } | |
381 | ||
382 | /** | |
383 | * nlmsg_find_attr - find a specific attribute in a netlink message | |
384 | * @nlh: netlink message header | |
385 | * @hdrlen: length of familiy specific header | |
386 | * @attrtype: type of attribute to look for | |
387 | * | |
388 | * Returns the first attribute which matches the specified type. | |
389 | */ | |
6b8c92ba | 390 | static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, |
bfa83a9e TG |
391 | int hdrlen, int attrtype) |
392 | { | |
393 | return nla_find(nlmsg_attrdata(nlh, hdrlen), | |
394 | nlmsg_attrlen(nlh, hdrlen), attrtype); | |
395 | } | |
396 | ||
397 | /** | |
398 | * nlmsg_validate - validate a netlink message including attributes | |
399 | * @nlh: netlinket message header | |
400 | * @hdrlen: length of familiy specific header | |
401 | * @maxtype: maximum attribute type to be expected | |
402 | * @policy: validation policy | |
403 | */ | |
3654654f JE |
404 | static inline int nlmsg_validate(const struct nlmsghdr *nlh, |
405 | int hdrlen, int maxtype, | |
ef7c79ed | 406 | const struct nla_policy *policy) |
bfa83a9e TG |
407 | { |
408 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
409 | return -EINVAL; | |
410 | ||
411 | return nla_validate(nlmsg_attrdata(nlh, hdrlen), | |
412 | nlmsg_attrlen(nlh, hdrlen), maxtype, policy); | |
413 | } | |
414 | ||
97676b6b TG |
415 | /** |
416 | * nlmsg_report - need to report back to application? | |
417 | * @nlh: netlink message header | |
418 | * | |
419 | * Returns 1 if a report back to the application is requested. | |
420 | */ | |
3a6c2b41 | 421 | static inline int nlmsg_report(const struct nlmsghdr *nlh) |
97676b6b TG |
422 | { |
423 | return !!(nlh->nlmsg_flags & NLM_F_ECHO); | |
424 | } | |
425 | ||
bfa83a9e TG |
426 | /** |
427 | * nlmsg_for_each_attr - iterate over a stream of attributes | |
428 | * @pos: loop counter, set to current attribute | |
429 | * @nlh: netlink message header | |
430 | * @hdrlen: length of familiy specific header | |
431 | * @rem: initialized to len, holds bytes currently remaining in stream | |
432 | */ | |
433 | #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ | |
434 | nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ | |
435 | nlmsg_attrlen(nlh, hdrlen), rem) | |
436 | ||
437 | #if 0 | |
438 | /* FIXME: Enable once all users have been converted */ | |
439 | ||
440 | /** | |
441 | * __nlmsg_put - Add a new netlink message to an skb | |
442 | * @skb: socket buffer to store message in | |
443 | * @pid: netlink process id | |
444 | * @seq: sequence number of message | |
445 | * @type: message type | |
446 | * @payload: length of message payload | |
447 | * @flags: message flags | |
448 | * | |
449 | * The caller is responsible to ensure that the skb provides enough | |
450 | * tailroom for both the netlink header and payload. | |
451 | */ | |
452 | static inline struct nlmsghdr *__nlmsg_put(struct sk_buff *skb, u32 pid, | |
453 | u32 seq, int type, int payload, | |
454 | int flags) | |
455 | { | |
456 | struct nlmsghdr *nlh; | |
457 | ||
458 | nlh = (struct nlmsghdr *) skb_put(skb, nlmsg_total_size(payload)); | |
459 | nlh->nlmsg_type = type; | |
460 | nlh->nlmsg_len = nlmsg_msg_size(payload); | |
461 | nlh->nlmsg_flags = flags; | |
462 | nlh->nlmsg_pid = pid; | |
463 | nlh->nlmsg_seq = seq; | |
464 | ||
465 | memset((unsigned char *) nlmsg_data(nlh) + payload, 0, | |
466 | nlmsg_padlen(payload)); | |
467 | ||
468 | return nlh; | |
469 | } | |
470 | #endif | |
471 | ||
472 | /** | |
473 | * nlmsg_put - Add a new netlink message to an skb | |
474 | * @skb: socket buffer to store message in | |
475 | * @pid: netlink process id | |
476 | * @seq: sequence number of message | |
477 | * @type: message type | |
478 | * @payload: length of message payload | |
479 | * @flags: message flags | |
480 | * | |
481 | * Returns NULL if the tailroom of the skb is insufficient to store | |
482 | * the message header and payload. | |
483 | */ | |
484 | static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, | |
485 | int type, int payload, int flags) | |
486 | { | |
487 | if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) | |
488 | return NULL; | |
489 | ||
490 | return __nlmsg_put(skb, pid, seq, type, payload, flags); | |
491 | } | |
492 | ||
493 | /** | |
494 | * nlmsg_put_answer - Add a new callback based netlink message to an skb | |
495 | * @skb: socket buffer to store message in | |
496 | * @cb: netlink callback | |
497 | * @type: message type | |
498 | * @payload: length of message payload | |
499 | * @flags: message flags | |
500 | * | |
501 | * Returns NULL if the tailroom of the skb is insufficient to store | |
502 | * the message header and payload. | |
503 | */ | |
504 | static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, | |
505 | struct netlink_callback *cb, | |
506 | int type, int payload, | |
507 | int flags) | |
508 | { | |
509 | return nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, | |
510 | type, payload, flags); | |
511 | } | |
512 | ||
513 | /** | |
514 | * nlmsg_new - Allocate a new netlink message | |
339bf98f | 515 | * @payload: size of the message payload |
fe4944e5 | 516 | * @flags: the type of memory to allocate. |
bfa83a9e | 517 | * |
339bf98f TG |
518 | * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
519 | * and a good default is needed. | |
bfa83a9e | 520 | */ |
339bf98f | 521 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
bfa83a9e | 522 | { |
339bf98f | 523 | return alloc_skb(nlmsg_total_size(payload), flags); |
bfa83a9e TG |
524 | } |
525 | ||
526 | /** | |
527 | * nlmsg_end - Finalize a netlink message | |
528 | * @skb: socket buffer the message is stored in | |
529 | * @nlh: netlink message header | |
530 | * | |
531 | * Corrects the netlink message header to include the appeneded | |
532 | * attributes. Only necessary if attributes have been added to | |
533 | * the message. | |
534 | * | |
535 | * Returns the total data length of the skb. | |
536 | */ | |
537 | static inline int nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) | |
538 | { | |
27a884dc | 539 | nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
bfa83a9e TG |
540 | |
541 | return skb->len; | |
542 | } | |
543 | ||
fe4944e5 TG |
544 | /** |
545 | * nlmsg_get_pos - return current position in netlink message | |
546 | * @skb: socket buffer the message is stored in | |
547 | * | |
548 | * Returns a pointer to the current tail of the message. | |
549 | */ | |
550 | static inline void *nlmsg_get_pos(struct sk_buff *skb) | |
551 | { | |
27a884dc | 552 | return skb_tail_pointer(skb); |
fe4944e5 TG |
553 | } |
554 | ||
555 | /** | |
556 | * nlmsg_trim - Trim message to a mark | |
557 | * @skb: socket buffer the message is stored in | |
558 | * @mark: mark to trim to | |
559 | * | |
bc3ed28c | 560 | * Trims the message to the provided mark. |
fe4944e5 | 561 | */ |
bc3ed28c | 562 | static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) |
fe4944e5 TG |
563 | { |
564 | if (mark) | |
565 | skb_trim(skb, (unsigned char *) mark - skb->data); | |
fe4944e5 TG |
566 | } |
567 | ||
bfa83a9e TG |
568 | /** |
569 | * nlmsg_cancel - Cancel construction of a netlink message | |
570 | * @skb: socket buffer the message is stored in | |
571 | * @nlh: netlink message header | |
572 | * | |
573 | * Removes the complete netlink message including all | |
bc3ed28c | 574 | * attributes from the socket buffer again. |
bfa83a9e | 575 | */ |
bc3ed28c | 576 | static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 577 | { |
bc3ed28c | 578 | nlmsg_trim(skb, nlh); |
bfa83a9e TG |
579 | } |
580 | ||
581 | /** | |
582 | * nlmsg_free - free a netlink message | |
583 | * @skb: socket buffer of netlink message | |
584 | */ | |
585 | static inline void nlmsg_free(struct sk_buff *skb) | |
586 | { | |
587 | kfree_skb(skb); | |
588 | } | |
589 | ||
590 | /** | |
591 | * nlmsg_multicast - multicast a netlink message | |
592 | * @sk: netlink socket to spread messages to | |
593 | * @skb: netlink message as socket buffer | |
594 | * @pid: own netlink pid to avoid sending to yourself | |
595 | * @group: multicast group id | |
d387f6ad | 596 | * @flags: allocation flags |
bfa83a9e TG |
597 | */ |
598 | static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, | |
d387f6ad | 599 | u32 pid, unsigned int group, gfp_t flags) |
bfa83a9e TG |
600 | { |
601 | int err; | |
602 | ||
603 | NETLINK_CB(skb).dst_group = group; | |
604 | ||
d387f6ad | 605 | err = netlink_broadcast(sk, skb, pid, group, flags); |
bfa83a9e TG |
606 | if (err > 0) |
607 | err = 0; | |
608 | ||
609 | return err; | |
610 | } | |
611 | ||
612 | /** | |
613 | * nlmsg_unicast - unicast a netlink message | |
614 | * @sk: netlink socket to spread message to | |
615 | * @skb: netlink message as socket buffer | |
616 | * @pid: netlink pid of the destination socket | |
617 | */ | |
618 | static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 pid) | |
619 | { | |
620 | int err; | |
621 | ||
622 | err = netlink_unicast(sk, skb, pid, MSG_DONTWAIT); | |
623 | if (err > 0) | |
624 | err = 0; | |
625 | ||
626 | return err; | |
627 | } | |
628 | ||
629 | /** | |
630 | * nlmsg_for_each_msg - iterate over a stream of messages | |
631 | * @pos: loop counter, set to current message | |
632 | * @head: head of message stream | |
633 | * @len: length of message stream | |
634 | * @rem: initialized to len, holds bytes currently remaining in stream | |
635 | */ | |
636 | #define nlmsg_for_each_msg(pos, head, len, rem) \ | |
637 | for (pos = head, rem = len; \ | |
638 | nlmsg_ok(pos, rem); \ | |
639 | pos = nlmsg_next(pos, &(rem))) | |
640 | ||
670dc283 JB |
641 | /** |
642 | * nl_dump_check_consistent - check if sequence is consistent and advertise if not | |
643 | * @cb: netlink callback structure that stores the sequence number | |
644 | * @nlh: netlink message header to write the flag to | |
645 | * | |
646 | * This function checks if the sequence (generation) number changed during dump | |
647 | * and if it did, advertises it in the netlink message header. | |
648 | * | |
649 | * The correct way to use it is to set cb->seq to the generation counter when | |
650 | * all locks for dumping have been acquired, and then call this function for | |
651 | * each message that is generated. | |
652 | * | |
653 | * Note that due to initialisation concerns, 0 is an invalid sequence number | |
654 | * and must not be used by code that uses this functionality. | |
655 | */ | |
656 | static inline void | |
657 | nl_dump_check_consistent(struct netlink_callback *cb, | |
658 | struct nlmsghdr *nlh) | |
659 | { | |
660 | if (cb->prev_seq && cb->seq != cb->prev_seq) | |
661 | nlh->nlmsg_flags |= NLM_F_DUMP_INTR; | |
662 | cb->prev_seq = cb->seq; | |
663 | } | |
664 | ||
bfa83a9e TG |
665 | /************************************************************************** |
666 | * Netlink Attributes | |
667 | **************************************************************************/ | |
668 | ||
669 | /** | |
670 | * nla_attr_size - length of attribute not including padding | |
671 | * @payload: length of payload | |
672 | */ | |
673 | static inline int nla_attr_size(int payload) | |
674 | { | |
675 | return NLA_HDRLEN + payload; | |
676 | } | |
677 | ||
678 | /** | |
679 | * nla_total_size - total length of attribute including padding | |
680 | * @payload: length of payload | |
681 | */ | |
682 | static inline int nla_total_size(int payload) | |
683 | { | |
684 | return NLA_ALIGN(nla_attr_size(payload)); | |
685 | } | |
686 | ||
687 | /** | |
688 | * nla_padlen - length of padding at the tail of attribute | |
689 | * @payload: length of payload | |
690 | */ | |
691 | static inline int nla_padlen(int payload) | |
692 | { | |
693 | return nla_total_size(payload) - nla_attr_size(payload); | |
694 | } | |
695 | ||
8f4c1f9b TG |
696 | /** |
697 | * nla_type - attribute type | |
698 | * @nla: netlink attribute | |
699 | */ | |
700 | static inline int nla_type(const struct nlattr *nla) | |
701 | { | |
702 | return nla->nla_type & NLA_TYPE_MASK; | |
703 | } | |
704 | ||
bfa83a9e TG |
705 | /** |
706 | * nla_data - head of payload | |
707 | * @nla: netlink attribute | |
708 | */ | |
709 | static inline void *nla_data(const struct nlattr *nla) | |
710 | { | |
711 | return (char *) nla + NLA_HDRLEN; | |
712 | } | |
713 | ||
714 | /** | |
715 | * nla_len - length of payload | |
716 | * @nla: netlink attribute | |
717 | */ | |
718 | static inline int nla_len(const struct nlattr *nla) | |
719 | { | |
720 | return nla->nla_len - NLA_HDRLEN; | |
721 | } | |
722 | ||
723 | /** | |
724 | * nla_ok - check if the netlink attribute fits into the remaining bytes | |
725 | * @nla: netlink attribute | |
726 | * @remaining: number of bytes remaining in attribute stream | |
727 | */ | |
728 | static inline int nla_ok(const struct nlattr *nla, int remaining) | |
729 | { | |
1045b03e | 730 | return remaining >= (int) sizeof(*nla) && |
bfa83a9e TG |
731 | nla->nla_len >= sizeof(*nla) && |
732 | nla->nla_len <= remaining; | |
733 | } | |
734 | ||
735 | /** | |
d1ec3b77 | 736 | * nla_next - next netlink attribute in attribute stream |
bfa83a9e TG |
737 | * @nla: netlink attribute |
738 | * @remaining: number of bytes remaining in attribute stream | |
739 | * | |
740 | * Returns the next netlink attribute in the attribute stream and | |
741 | * decrements remaining by the size of the current attribute. | |
742 | */ | |
743 | static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) | |
744 | { | |
745 | int totlen = NLA_ALIGN(nla->nla_len); | |
746 | ||
747 | *remaining -= totlen; | |
748 | return (struct nlattr *) ((char *) nla + totlen); | |
749 | } | |
750 | ||
fe4944e5 TG |
751 | /** |
752 | * nla_find_nested - find attribute in a set of nested attributes | |
753 | * @nla: attribute containing the nested attributes | |
754 | * @attrtype: type of attribute to look for | |
755 | * | |
756 | * Returns the first attribute which matches the specified type. | |
757 | */ | |
3654654f JE |
758 | static inline struct nlattr * |
759 | nla_find_nested(const struct nlattr *nla, int attrtype) | |
fe4944e5 TG |
760 | { |
761 | return nla_find(nla_data(nla), nla_len(nla), attrtype); | |
762 | } | |
763 | ||
bfa83a9e TG |
764 | /** |
765 | * nla_parse_nested - parse nested attributes | |
766 | * @tb: destination array with maxtype+1 elements | |
767 | * @maxtype: maximum attribute type to be expected | |
768 | * @nla: attribute containing the nested attributes | |
769 | * @policy: validation policy | |
770 | * | |
771 | * See nla_parse() | |
772 | */ | |
773 | static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, | |
b057efd4 | 774 | const struct nlattr *nla, |
ef7c79ed | 775 | const struct nla_policy *policy) |
bfa83a9e TG |
776 | { |
777 | return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); | |
778 | } | |
1092cb21 | 779 | |
bfa83a9e | 780 | /** |
d1ec3b77 | 781 | * nla_put_u8 - Add a u8 netlink attribute to a socket buffer |
bfa83a9e TG |
782 | * @skb: socket buffer to add attribute to |
783 | * @attrtype: attribute type | |
784 | * @value: numeric value | |
785 | */ | |
786 | static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) | |
787 | { | |
788 | return nla_put(skb, attrtype, sizeof(u8), &value); | |
789 | } | |
790 | ||
791 | /** | |
792 | * nla_put_u16 - Add a u16 netlink attribute to a socket buffer | |
793 | * @skb: socket buffer to add attribute to | |
794 | * @attrtype: attribute type | |
795 | * @value: numeric value | |
796 | */ | |
797 | static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) | |
798 | { | |
799 | return nla_put(skb, attrtype, sizeof(u16), &value); | |
800 | } | |
801 | ||
802 | /** | |
803 | * nla_put_u32 - Add a u32 netlink attribute to a socket buffer | |
804 | * @skb: socket buffer to add attribute to | |
805 | * @attrtype: attribute type | |
806 | * @value: numeric value | |
807 | */ | |
808 | static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) | |
809 | { | |
810 | return nla_put(skb, attrtype, sizeof(u32), &value); | |
811 | } | |
812 | ||
813 | /** | |
814 | * nla_put_64 - Add a u64 netlink attribute to a socket buffer | |
815 | * @skb: socket buffer to add attribute to | |
816 | * @attrtype: attribute type | |
817 | * @value: numeric value | |
818 | */ | |
819 | static inline int nla_put_u64(struct sk_buff *skb, int attrtype, u64 value) | |
820 | { | |
821 | return nla_put(skb, attrtype, sizeof(u64), &value); | |
822 | } | |
823 | ||
824 | /** | |
825 | * nla_put_string - Add a string netlink attribute to a socket buffer | |
826 | * @skb: socket buffer to add attribute to | |
827 | * @attrtype: attribute type | |
828 | * @str: NUL terminated string | |
829 | */ | |
830 | static inline int nla_put_string(struct sk_buff *skb, int attrtype, | |
831 | const char *str) | |
832 | { | |
833 | return nla_put(skb, attrtype, strlen(str) + 1, str); | |
834 | } | |
835 | ||
836 | /** | |
837 | * nla_put_flag - Add a flag netlink attribute to a socket buffer | |
838 | * @skb: socket buffer to add attribute to | |
839 | * @attrtype: attribute type | |
840 | */ | |
841 | static inline int nla_put_flag(struct sk_buff *skb, int attrtype) | |
842 | { | |
843 | return nla_put(skb, attrtype, 0, NULL); | |
844 | } | |
845 | ||
846 | /** | |
847 | * nla_put_msecs - Add a msecs netlink attribute to a socket buffer | |
848 | * @skb: socket buffer to add attribute to | |
849 | * @attrtype: attribute type | |
850 | * @jiffies: number of msecs in jiffies | |
851 | */ | |
852 | static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, | |
853 | unsigned long jiffies) | |
854 | { | |
855 | u64 tmp = jiffies_to_msecs(jiffies); | |
856 | return nla_put(skb, attrtype, sizeof(u64), &tmp); | |
857 | } | |
858 | ||
859 | #define NLA_PUT(skb, attrtype, attrlen, data) \ | |
860 | do { \ | |
f4d900a2 | 861 | if (unlikely(nla_put(skb, attrtype, attrlen, data) < 0)) \ |
bfa83a9e TG |
862 | goto nla_put_failure; \ |
863 | } while(0) | |
864 | ||
865 | #define NLA_PUT_TYPE(skb, type, attrtype, value) \ | |
866 | do { \ | |
867 | type __tmp = value; \ | |
868 | NLA_PUT(skb, attrtype, sizeof(type), &__tmp); \ | |
869 | } while(0) | |
870 | ||
871 | #define NLA_PUT_U8(skb, attrtype, value) \ | |
872 | NLA_PUT_TYPE(skb, u8, attrtype, value) | |
873 | ||
874 | #define NLA_PUT_U16(skb, attrtype, value) \ | |
875 | NLA_PUT_TYPE(skb, u16, attrtype, value) | |
876 | ||
4a89c256 TG |
877 | #define NLA_PUT_LE16(skb, attrtype, value) \ |
878 | NLA_PUT_TYPE(skb, __le16, attrtype, value) | |
879 | ||
838965ba PM |
880 | #define NLA_PUT_BE16(skb, attrtype, value) \ |
881 | NLA_PUT_TYPE(skb, __be16, attrtype, value) | |
882 | ||
f703651e JK |
883 | #define NLA_PUT_NET16(skb, attrtype, value) \ |
884 | NLA_PUT_BE16(skb, attrtype | NLA_F_NET_BYTEORDER, value) | |
885 | ||
bfa83a9e TG |
886 | #define NLA_PUT_U32(skb, attrtype, value) \ |
887 | NLA_PUT_TYPE(skb, u32, attrtype, value) | |
888 | ||
00012e5b AV |
889 | #define NLA_PUT_BE32(skb, attrtype, value) \ |
890 | NLA_PUT_TYPE(skb, __be32, attrtype, value) | |
891 | ||
f703651e JK |
892 | #define NLA_PUT_NET32(skb, attrtype, value) \ |
893 | NLA_PUT_BE32(skb, attrtype | NLA_F_NET_BYTEORDER, value) | |
894 | ||
bfa83a9e TG |
895 | #define NLA_PUT_U64(skb, attrtype, value) \ |
896 | NLA_PUT_TYPE(skb, u64, attrtype, value) | |
897 | ||
07a7c107 KPO |
898 | #define NLA_PUT_BE64(skb, attrtype, value) \ |
899 | NLA_PUT_TYPE(skb, __be64, attrtype, value) | |
900 | ||
f703651e JK |
901 | #define NLA_PUT_NET64(skb, attrtype, value) \ |
902 | NLA_PUT_BE64(skb, attrtype | NLA_F_NET_BYTEORDER, value) | |
903 | ||
bfa83a9e TG |
904 | #define NLA_PUT_STRING(skb, attrtype, value) \ |
905 | NLA_PUT(skb, attrtype, strlen(value) + 1, value) | |
906 | ||
ff5dfe73 | 907 | #define NLA_PUT_FLAG(skb, attrtype) \ |
bfa83a9e TG |
908 | NLA_PUT(skb, attrtype, 0, NULL) |
909 | ||
910 | #define NLA_PUT_MSECS(skb, attrtype, jiffies) \ | |
911 | NLA_PUT_U64(skb, attrtype, jiffies_to_msecs(jiffies)) | |
912 | ||
913 | /** | |
914 | * nla_get_u32 - return payload of u32 attribute | |
915 | * @nla: u32 netlink attribute | |
916 | */ | |
b057efd4 | 917 | static inline u32 nla_get_u32(const struct nlattr *nla) |
bfa83a9e TG |
918 | { |
919 | return *(u32 *) nla_data(nla); | |
920 | } | |
921 | ||
00012e5b AV |
922 | /** |
923 | * nla_get_be32 - return payload of __be32 attribute | |
924 | * @nla: __be32 netlink attribute | |
925 | */ | |
b057efd4 | 926 | static inline __be32 nla_get_be32(const struct nlattr *nla) |
00012e5b AV |
927 | { |
928 | return *(__be32 *) nla_data(nla); | |
929 | } | |
930 | ||
bfa83a9e TG |
931 | /** |
932 | * nla_get_u16 - return payload of u16 attribute | |
933 | * @nla: u16 netlink attribute | |
934 | */ | |
b057efd4 | 935 | static inline u16 nla_get_u16(const struct nlattr *nla) |
bfa83a9e TG |
936 | { |
937 | return *(u16 *) nla_data(nla); | |
938 | } | |
939 | ||
838965ba PM |
940 | /** |
941 | * nla_get_be16 - return payload of __be16 attribute | |
942 | * @nla: __be16 netlink attribute | |
943 | */ | |
b057efd4 | 944 | static inline __be16 nla_get_be16(const struct nlattr *nla) |
838965ba PM |
945 | { |
946 | return *(__be16 *) nla_data(nla); | |
947 | } | |
948 | ||
4a89c256 TG |
949 | /** |
950 | * nla_get_le16 - return payload of __le16 attribute | |
951 | * @nla: __le16 netlink attribute | |
952 | */ | |
b057efd4 | 953 | static inline __le16 nla_get_le16(const struct nlattr *nla) |
4a89c256 TG |
954 | { |
955 | return *(__le16 *) nla_data(nla); | |
956 | } | |
957 | ||
bfa83a9e TG |
958 | /** |
959 | * nla_get_u8 - return payload of u8 attribute | |
960 | * @nla: u8 netlink attribute | |
961 | */ | |
b057efd4 | 962 | static inline u8 nla_get_u8(const struct nlattr *nla) |
bfa83a9e TG |
963 | { |
964 | return *(u8 *) nla_data(nla); | |
965 | } | |
966 | ||
967 | /** | |
968 | * nla_get_u64 - return payload of u64 attribute | |
969 | * @nla: u64 netlink attribute | |
970 | */ | |
b057efd4 | 971 | static inline u64 nla_get_u64(const struct nlattr *nla) |
bfa83a9e TG |
972 | { |
973 | u64 tmp; | |
974 | ||
975 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
976 | ||
977 | return tmp; | |
978 | } | |
979 | ||
a17c8598 PNA |
980 | /** |
981 | * nla_get_be64 - return payload of __be64 attribute | |
982 | * @nla: __be64 netlink attribute | |
983 | */ | |
984 | static inline __be64 nla_get_be64(const struct nlattr *nla) | |
985 | { | |
f5d410f2 PNA |
986 | __be64 tmp; |
987 | ||
988 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
989 | ||
990 | return tmp; | |
a17c8598 PNA |
991 | } |
992 | ||
bfa83a9e TG |
993 | /** |
994 | * nla_get_flag - return payload of flag attribute | |
995 | * @nla: flag netlink attribute | |
996 | */ | |
b057efd4 | 997 | static inline int nla_get_flag(const struct nlattr *nla) |
bfa83a9e TG |
998 | { |
999 | return !!nla; | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * nla_get_msecs - return payload of msecs attribute | |
1004 | * @nla: msecs netlink attribute | |
1005 | * | |
1006 | * Returns the number of milliseconds in jiffies. | |
1007 | */ | |
b057efd4 | 1008 | static inline unsigned long nla_get_msecs(const struct nlattr *nla) |
bfa83a9e TG |
1009 | { |
1010 | u64 msecs = nla_get_u64(nla); | |
1011 | ||
1012 | return msecs_to_jiffies((unsigned long) msecs); | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * nla_nest_start - Start a new level of nested attributes | |
1017 | * @skb: socket buffer to add attributes to | |
1018 | * @attrtype: attribute type of container | |
1019 | * | |
1020 | * Returns the container attribute | |
1021 | */ | |
1022 | static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) | |
1023 | { | |
27a884dc | 1024 | struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
bfa83a9e TG |
1025 | |
1026 | if (nla_put(skb, attrtype, 0, NULL) < 0) | |
1027 | return NULL; | |
1028 | ||
1029 | return start; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * nla_nest_end - Finalize nesting of attributes | |
d1ec3b77 | 1034 | * @skb: socket buffer the attributes are stored in |
bfa83a9e TG |
1035 | * @start: container attribute |
1036 | * | |
1037 | * Corrects the container attribute header to include the all | |
1038 | * appeneded attributes. | |
1039 | * | |
1040 | * Returns the total data length of the skb. | |
1041 | */ | |
1042 | static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) | |
1043 | { | |
27a884dc | 1044 | start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
bfa83a9e TG |
1045 | return skb->len; |
1046 | } | |
1047 | ||
1048 | /** | |
1049 | * nla_nest_cancel - Cancel nesting of attributes | |
1050 | * @skb: socket buffer the message is stored in | |
1051 | * @start: container attribute | |
1052 | * | |
1053 | * Removes the container attribute and including all nested | |
bc3ed28c | 1054 | * attributes. Returns -EMSGSIZE |
bfa83a9e | 1055 | */ |
bc3ed28c | 1056 | static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
bfa83a9e | 1057 | { |
bc3ed28c | 1058 | nlmsg_trim(skb, start); |
bfa83a9e TG |
1059 | } |
1060 | ||
4fe5d5c0 PM |
1061 | /** |
1062 | * nla_validate_nested - Validate a stream of nested attributes | |
1063 | * @start: container attribute | |
1064 | * @maxtype: maximum attribute type to be expected | |
1065 | * @policy: validation policy | |
1066 | * | |
1067 | * Validates all attributes in the nested attribute stream against the | |
1068 | * specified policy. Attributes with a type exceeding maxtype will be | |
1069 | * ignored. See documenation of struct nla_policy for more details. | |
1070 | * | |
1071 | * Returns 0 on success or a negative error code. | |
1072 | */ | |
3654654f | 1073 | static inline int nla_validate_nested(const struct nlattr *start, int maxtype, |
ef7c79ed | 1074 | const struct nla_policy *policy) |
4fe5d5c0 PM |
1075 | { |
1076 | return nla_validate(nla_data(start), nla_len(start), maxtype, policy); | |
1077 | } | |
1078 | ||
bfa83a9e TG |
1079 | /** |
1080 | * nla_for_each_attr - iterate over a stream of attributes | |
1081 | * @pos: loop counter, set to current attribute | |
1082 | * @head: head of attribute stream | |
1083 | * @len: length of attribute stream | |
1084 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1085 | */ | |
1086 | #define nla_for_each_attr(pos, head, len, rem) \ | |
1087 | for (pos = head, rem = len; \ | |
1088 | nla_ok(pos, rem); \ | |
1089 | pos = nla_next(pos, &(rem))) | |
1090 | ||
fe4944e5 TG |
1091 | /** |
1092 | * nla_for_each_nested - iterate over nested attributes | |
1093 | * @pos: loop counter, set to current attribute | |
1094 | * @nla: attribute containing the nested attributes | |
1095 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1096 | */ | |
1097 | #define nla_for_each_nested(pos, nla, rem) \ | |
1098 | nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) | |
1099 | ||
bfa83a9e | 1100 | #endif |