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1 | #ifndef __NET_NETLINK_H | |
2 | #define __NET_NETLINK_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/netlink.h> | |
6 | #include <linux/jiffies.h> | |
7 | #include <linux/in6.h> | |
8 | ||
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() | |
39 | * nlmsg_end() finalize netlink message | |
40 | * nlmsg_get_pos() return current position in message | |
41 | * nlmsg_trim() trim part of message | |
42 | * 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 | |
48 | * nlmsg_notify() send notification message | |
49 | * | |
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 | * | |
70 | * Misc: | |
71 | * nlmsg_report() report back to application? | |
72 | * | |
73 | * ------------------------------------------------------------------------ | |
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: | |
88 | * struct nlattr netlink attribute header | |
89 | * | |
90 | * Attribute Construction: | |
91 | * nla_reserve(skb, type, len) reserve room for an attribute | |
92 | * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr | |
93 | * nla_put(skb, type, len, data) add attribute to skb | |
94 | * nla_put_nohdr(skb, len, data) add attribute w/o hdr | |
95 | * nla_append(skb, len, data) append data to skb | |
96 | * | |
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 | |
102 | * 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 | |
106 | * 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 | |
109 | * 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 | |
111 | * | |
112 | * 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 | |
131 | * 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 | |
135 | * 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 | |
148 | * nla_validate_nested() validate a stream of nested attributes | |
149 | * nla_find() find attribute in stream of attributes | |
150 | * nla_find_nested() find attribute in nested attributes | |
151 | * nla_parse() parse and validate stream of attrs | |
152 | * nla_parse_nested() parse nested attribuets | |
153 | * nla_for_each_attr() loop over all attributes | |
154 | * nla_for_each_nested() loop over the nested attributes | |
155 | *========================================================================= | |
156 | */ | |
157 | ||
158 | /** | |
159 | * Standard attribute types to specify validation policy | |
160 | */ | |
161 | enum { | |
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, | |
171 | NLA_NESTED_COMPAT, | |
172 | NLA_NUL_STRING, | |
173 | NLA_BINARY, | |
174 | NLA_S8, | |
175 | NLA_S16, | |
176 | NLA_S32, | |
177 | NLA_S64, | |
178 | __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 | |
186 | * @len: Type specific length of payload | |
187 | * | |
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 | * | |
191 | * 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 | |
195 | * NLA_BINARY Maximum length of attribute payload | |
196 | * 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, | |
201 | * NLA_S8, NLA_S16, | |
202 | * NLA_S32, NLA_S64, | |
203 | * 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 | |
207 | * | |
208 | * Example: | |
209 | * static const struct nla_policy my_policy[ATTR_MAX+1] = { | |
210 | * [ATTR_FOO] = { .type = NLA_U16 }, | |
211 | * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, | |
212 | * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, | |
213 | * }; | |
214 | */ | |
215 | struct nla_policy { | |
216 | u16 type; | |
217 | u16 len; | |
218 | }; | |
219 | ||
220 | /** | |
221 | * struct nl_info - netlink source information | |
222 | * @nlh: Netlink message header of original request | |
223 | * @portid: Netlink PORTID of requesting application | |
224 | */ | |
225 | struct nl_info { | |
226 | struct nlmsghdr *nlh; | |
227 | struct net *nl_net; | |
228 | u32 portid; | |
229 | }; | |
230 | ||
231 | int netlink_rcv_skb(struct sk_buff *skb, | |
232 | int (*cb)(struct sk_buff *, struct nlmsghdr *)); | |
233 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, | |
234 | unsigned int group, int report, gfp_t flags); | |
235 | ||
236 | int nla_validate(const struct nlattr *head, int len, int maxtype, | |
237 | const struct nla_policy *policy); | |
238 | int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, | |
239 | int len, const struct nla_policy *policy); | |
240 | int nla_policy_len(const struct nla_policy *, int); | |
241 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); | |
242 | size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); | |
243 | int nla_memcpy(void *dest, const struct nlattr *src, int count); | |
244 | int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); | |
245 | int nla_strcmp(const struct nlattr *nla, const char *str); | |
246 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
247 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); | |
248 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
249 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); | |
250 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
251 | const void *data); | |
252 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); | |
253 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); | |
254 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); | |
255 | int nla_append(struct sk_buff *skb, int attrlen, const void *data); | |
256 | ||
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 | */ | |
265 | static 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 | */ | |
274 | static 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 | */ | |
283 | static 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 | |
290 | * @nlh: netlink message header | |
291 | */ | |
292 | static 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 | */ | |
301 | static 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 | */ | |
311 | static 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 | */ | |
323 | static 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 | */ | |
333 | static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) | |
334 | { | |
335 | return (remaining >= (int) sizeof(struct nlmsghdr) && | |
336 | 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 | */ | |
348 | static inline struct nlmsghdr * | |
349 | nlmsg_next(const struct nlmsghdr *nlh, int *remaining) | |
350 | { | |
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 | */ | |
368 | static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, | |
369 | struct nlattr *tb[], int maxtype, | |
370 | const struct nla_policy *policy) | |
371 | { | |
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 | */ | |
387 | static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, | |
388 | 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 | */ | |
401 | static inline int nlmsg_validate(const struct nlmsghdr *nlh, | |
402 | int hdrlen, int maxtype, | |
403 | const struct nla_policy *policy) | |
404 | { | |
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 | /** | |
413 | * 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 | */ | |
418 | static inline int nlmsg_report(const struct nlmsghdr *nlh) | |
419 | { | |
420 | return !!(nlh->nlmsg_flags & NLM_F_ECHO); | |
421 | } | |
422 | ||
423 | /** | |
424 | * 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 | ||
434 | /** | |
435 | * nlmsg_put - Add a new netlink message to an skb | |
436 | * @skb: socket buffer to store message in | |
437 | * @portid: netlink PORTID of requesting application | |
438 | * @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 | */ | |
446 | static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, | |
447 | int type, int payload, int flags) | |
448 | { | |
449 | if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) | |
450 | return NULL; | |
451 | ||
452 | return __nlmsg_put(skb, portid, seq, type, payload, flags); | |
453 | } | |
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 | */ | |
466 | static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, | |
467 | struct netlink_callback *cb, | |
468 | int type, int payload, | |
469 | int flags) | |
470 | { | |
471 | return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, | |
472 | type, payload, flags); | |
473 | } | |
474 | ||
475 | /** | |
476 | * nlmsg_new - Allocate a new netlink message | |
477 | * @payload: size of the message payload | |
478 | * @flags: the type of memory to allocate. | |
479 | * | |
480 | * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known | |
481 | * and a good default is needed. | |
482 | */ | |
483 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) | |
484 | { | |
485 | return alloc_skb(nlmsg_total_size(payload), flags); | |
486 | } | |
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. | |
496 | */ | |
497 | static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) | |
498 | { | |
499 | nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; | |
500 | } | |
501 | ||
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 | { | |
510 | return skb_tail_pointer(skb); | |
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 | * | |
518 | * Trims the message to the provided mark. | |
519 | */ | |
520 | static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) | |
521 | { | |
522 | if (mark) { | |
523 | WARN_ON((unsigned char *) mark < skb->data); | |
524 | skb_trim(skb, (unsigned char *) mark - skb->data); | |
525 | } | |
526 | } | |
527 | ||
528 | /** | |
529 | * 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 | |
534 | * attributes from the socket buffer again. | |
535 | */ | |
536 | static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) | |
537 | { | |
538 | nlmsg_trim(skb, nlh); | |
539 | } | |
540 | ||
541 | /** | |
542 | * nlmsg_free - free a netlink message | |
543 | * @skb: socket buffer of netlink message | |
544 | */ | |
545 | static 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 | |
554 | * @portid: own netlink portid to avoid sending to yourself | |
555 | * @group: multicast group id | |
556 | * @flags: allocation flags | |
557 | */ | |
558 | static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, | |
559 | u32 portid, unsigned int group, gfp_t flags) | |
560 | { | |
561 | int err; | |
562 | ||
563 | NETLINK_CB(skb).dst_group = group; | |
564 | ||
565 | err = netlink_broadcast(sk, skb, portid, group, flags); | |
566 | 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 | |
576 | * @portid: netlink portid of the destination socket | |
577 | */ | |
578 | static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) | |
579 | { | |
580 | int err; | |
581 | ||
582 | err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); | |
583 | 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 | ||
601 | /** | |
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 | */ | |
616 | static inline void | |
617 | nl_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 | ||
625 | /************************************************************************** | |
626 | * Netlink Attributes | |
627 | **************************************************************************/ | |
628 | ||
629 | /** | |
630 | * nla_attr_size - length of attribute not including padding | |
631 | * @payload: length of payload | |
632 | */ | |
633 | static 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 | */ | |
642 | static 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 | */ | |
651 | static inline int nla_padlen(int payload) | |
652 | { | |
653 | return nla_total_size(payload) - nla_attr_size(payload); | |
654 | } | |
655 | ||
656 | /** | |
657 | * nla_type - attribute type | |
658 | * @nla: netlink attribute | |
659 | */ | |
660 | static inline int nla_type(const struct nlattr *nla) | |
661 | { | |
662 | return nla->nla_type & NLA_TYPE_MASK; | |
663 | } | |
664 | ||
665 | /** | |
666 | * nla_data - head of payload | |
667 | * @nla: netlink attribute | |
668 | */ | |
669 | static 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 | */ | |
678 | static 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 | */ | |
688 | static inline int nla_ok(const struct nlattr *nla, int remaining) | |
689 | { | |
690 | return remaining >= (int) sizeof(*nla) && | |
691 | nla->nla_len >= sizeof(*nla) && | |
692 | nla->nla_len <= remaining; | |
693 | } | |
694 | ||
695 | /** | |
696 | * nla_next - next netlink attribute in attribute stream | |
697 | * @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 | */ | |
703 | static 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 | /** | |
712 | * 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 | */ | |
718 | static inline struct nlattr * | |
719 | nla_find_nested(const struct nlattr *nla, int attrtype) | |
720 | { | |
721 | return nla_find(nla_data(nla), nla_len(nla), attrtype); | |
722 | } | |
723 | ||
724 | /** | |
725 | * 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 | */ | |
733 | static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, | |
734 | const struct nlattr *nla, | |
735 | const struct nla_policy *policy) | |
736 | { | |
737 | return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); | |
738 | } | |
739 | ||
740 | /** | |
741 | * nla_put_u8 - Add a u8 netlink attribute to a socket buffer | |
742 | * @skb: socket buffer to add attribute to | |
743 | * @attrtype: attribute type | |
744 | * @value: numeric value | |
745 | */ | |
746 | static 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 | */ | |
757 | static 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 | /** | |
763 | * 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 | */ | |
768 | static 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 | /** | |
774 | * 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 | */ | |
779 | static 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 | /** | |
785 | * 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 | */ | |
790 | static 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 | /** | |
796 | * 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 | */ | |
801 | static 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 | /** | |
807 | * 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 | */ | |
812 | static 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 | /** | |
818 | * 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 | */ | |
823 | static 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 | /** | |
829 | * 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 | */ | |
834 | static 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 | /** | |
840 | * nla_put_u64 - Add a u64 netlink attribute to a socket buffer | |
841 | * @skb: socket buffer to add attribute to | |
842 | * @attrtype: attribute type | |
843 | * @value: numeric value | |
844 | */ | |
845 | static 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 | /** | |
851 | * 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 | */ | |
856 | static 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 | /** | |
862 | * 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 | */ | |
867 | static 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 | /** | |
873 | * 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 | */ | |
878 | static 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 | /** | |
884 | * 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 | */ | |
889 | static 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 | */ | |
900 | static 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 | */ | |
911 | static 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 | */ | |
922 | static 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 | /** | |
928 | * 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 | */ | |
933 | static 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 | */ | |
944 | static 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 | |
953 | * @njiffies: number of jiffies to convert to msecs | |
954 | */ | |
955 | static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, | |
956 | unsigned long njiffies) | |
957 | { | |
958 | u64 tmp = jiffies_to_msecs(njiffies); | |
959 | return nla_put(skb, attrtype, sizeof(u64), &tmp); | |
960 | } | |
961 | ||
962 | /** | |
963 | * 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 | */ | |
969 | static 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 | */ | |
982 | static 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 | /** | |
989 | * nla_get_u32 - return payload of u32 attribute | |
990 | * @nla: u32 netlink attribute | |
991 | */ | |
992 | static inline u32 nla_get_u32(const struct nlattr *nla) | |
993 | { | |
994 | return *(u32 *) nla_data(nla); | |
995 | } | |
996 | ||
997 | /** | |
998 | * nla_get_be32 - return payload of __be32 attribute | |
999 | * @nla: __be32 netlink attribute | |
1000 | */ | |
1001 | static inline __be32 nla_get_be32(const struct nlattr *nla) | |
1002 | { | |
1003 | return *(__be32 *) nla_data(nla); | |
1004 | } | |
1005 | ||
1006 | /** | |
1007 | * nla_get_u16 - return payload of u16 attribute | |
1008 | * @nla: u16 netlink attribute | |
1009 | */ | |
1010 | static inline u16 nla_get_u16(const struct nlattr *nla) | |
1011 | { | |
1012 | return *(u16 *) nla_data(nla); | |
1013 | } | |
1014 | ||
1015 | /** | |
1016 | * nla_get_be16 - return payload of __be16 attribute | |
1017 | * @nla: __be16 netlink attribute | |
1018 | */ | |
1019 | static inline __be16 nla_get_be16(const struct nlattr *nla) | |
1020 | { | |
1021 | return *(__be16 *) nla_data(nla); | |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * nla_get_le16 - return payload of __le16 attribute | |
1026 | * @nla: __le16 netlink attribute | |
1027 | */ | |
1028 | static inline __le16 nla_get_le16(const struct nlattr *nla) | |
1029 | { | |
1030 | return *(__le16 *) nla_data(nla); | |
1031 | } | |
1032 | ||
1033 | /** | |
1034 | * nla_get_u8 - return payload of u8 attribute | |
1035 | * @nla: u8 netlink attribute | |
1036 | */ | |
1037 | static inline u8 nla_get_u8(const struct nlattr *nla) | |
1038 | { | |
1039 | return *(u8 *) nla_data(nla); | |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * nla_get_u64 - return payload of u64 attribute | |
1044 | * @nla: u64 netlink attribute | |
1045 | */ | |
1046 | static inline u64 nla_get_u64(const struct nlattr *nla) | |
1047 | { | |
1048 | u64 tmp; | |
1049 | ||
1050 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1051 | ||
1052 | return tmp; | |
1053 | } | |
1054 | ||
1055 | /** | |
1056 | * nla_get_be64 - return payload of __be64 attribute | |
1057 | * @nla: __be64 netlink attribute | |
1058 | */ | |
1059 | static inline __be64 nla_get_be64(const struct nlattr *nla) | |
1060 | { | |
1061 | __be64 tmp; | |
1062 | ||
1063 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1064 | ||
1065 | return tmp; | |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * nla_get_s32 - return payload of s32 attribute | |
1070 | * @nla: s32 netlink attribute | |
1071 | */ | |
1072 | static 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 | */ | |
1081 | static 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 | */ | |
1090 | static 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 | */ | |
1099 | static 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 | /** | |
1109 | * nla_get_flag - return payload of flag attribute | |
1110 | * @nla: flag netlink attribute | |
1111 | */ | |
1112 | static inline int nla_get_flag(const struct nlattr *nla) | |
1113 | { | |
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 | */ | |
1123 | static inline unsigned long nla_get_msecs(const struct nlattr *nla) | |
1124 | { | |
1125 | u64 msecs = nla_get_u64(nla); | |
1126 | ||
1127 | return msecs_to_jiffies((unsigned long) msecs); | |
1128 | } | |
1129 | ||
1130 | /** | |
1131 | * nla_get_in_addr - return payload of IPv4 address attribute | |
1132 | * @nla: IPv4 address netlink attribute | |
1133 | */ | |
1134 | static 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 | */ | |
1143 | static 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 | /** | |
1152 | * 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 | */ | |
1158 | static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) | |
1159 | { | |
1160 | struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); | |
1161 | ||
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 | |
1170 | * @skb: socket buffer the attributes are stored in | |
1171 | * @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 | */ | |
1178 | static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) | |
1179 | { | |
1180 | start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; | |
1181 | 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 | |
1190 | * attributes. Returns -EMSGSIZE | |
1191 | */ | |
1192 | static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) | |
1193 | { | |
1194 | nlmsg_trim(skb, start); | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * 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 | */ | |
1209 | static inline int nla_validate_nested(const struct nlattr *start, int maxtype, | |
1210 | const struct nla_policy *policy) | |
1211 | { | |
1212 | return nla_validate(nla_data(start), nla_len(start), maxtype, policy); | |
1213 | } | |
1214 | ||
1215 | /** | |
1216 | * 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 | ||
1227 | /** | |
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 | ||
1236 | /** | |
1237 | * nla_is_last - Test if attribute is last in stream | |
1238 | * @nla: attribute to test | |
1239 | * @rem: bytes remaining in stream | |
1240 | */ | |
1241 | static inline bool nla_is_last(const struct nlattr *nla, int rem) | |
1242 | { | |
1243 | return nla->nla_len == rem; | |
1244 | } | |
1245 | ||
1246 | #endif |