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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> |
930345ea | 7 | #include <linux/in6.h> |
bfa83a9e TG |
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() | |
1dc8d8c0 | 39 | * nlmsg_end() finalize netlink message |
fe4944e5 TG |
40 | * nlmsg_get_pos() return current position in message |
41 | * nlmsg_trim() trim part of message | |
bfa83a9e TG |
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 | |
d387f6ad | 48 | * nlmsg_notify() send notification message |
bfa83a9e TG |
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 | * | |
97676b6b TG |
70 | * Misc: |
71 | * nlmsg_report() report back to application? | |
72 | * | |
bfa83a9e TG |
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: | |
d1ec3b77 | 88 | * struct nlattr netlink attribute header |
bfa83a9e TG |
89 | * |
90 | * Attribute Construction: | |
fe4944e5 TG |
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 | |
bfa83a9e | 93 | * nla_put(skb, type, len, data) add attribute to skb |
fe4944e5 | 94 | * nla_put_nohdr(skb, len, data) add attribute w/o hdr |
01480e1c | 95 | * nla_append(skb, len, data) append data to skb |
bfa83a9e TG |
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 | |
50225243 ND |
101 | * nla_put_u64_64bits(skb, type, |
102 | * value, padattr) add u64 attribute to skb | |
4778e0be JP |
103 | * nla_put_s8(skb, type, value) add s8 attribute to skb |
104 | * nla_put_s16(skb, type, value) add s16 attribute to skb | |
105 | * nla_put_s32(skb, type, value) add s32 attribute to skb | |
756a2f59 ND |
106 | * nla_put_s64(skb, type, value, |
107 | * padattr) add s64 attribute to skb | |
bfa83a9e TG |
108 | * nla_put_string(skb, type, str) add string attribute to skb |
109 | * nla_put_flag(skb, type) add flag attribute to skb | |
2175d87c ND |
110 | * nla_put_msecs(skb, type, jiffies, |
111 | * padattr) add msecs attribute to skb | |
930345ea JB |
112 | * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb |
113 | * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb | |
bfa83a9e | 114 | * |
bfa83a9e TG |
115 | * Nested Attributes Construction: |
116 | * nla_nest_start(skb, type) start a nested attribute | |
117 | * nla_nest_end(skb, nla) finalize a nested attribute | |
118 | * nla_nest_cancel(skb, nla) cancel nested attribute construction | |
119 | * | |
120 | * Attribute Length Calculations: | |
121 | * nla_attr_size(payload) length of attribute w/o padding | |
122 | * nla_total_size(payload) length of attribute w/ padding | |
123 | * nla_padlen(payload) length of padding | |
124 | * | |
125 | * Attribute Payload Access: | |
126 | * nla_data(nla) head of attribute payload | |
127 | * nla_len(nla) length of attribute payload | |
128 | * | |
129 | * Attribute Payload Access for Basic Types: | |
130 | * nla_get_u8(nla) get payload for a u8 attribute | |
131 | * nla_get_u16(nla) get payload for a u16 attribute | |
132 | * nla_get_u32(nla) get payload for a u32 attribute | |
133 | * nla_get_u64(nla) get payload for a u64 attribute | |
4778e0be JP |
134 | * nla_get_s8(nla) get payload for a s8 attribute |
135 | * nla_get_s16(nla) get payload for a s16 attribute | |
136 | * nla_get_s32(nla) get payload for a s32 attribute | |
137 | * nla_get_s64(nla) get payload for a s64 attribute | |
bfa83a9e TG |
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, |
4778e0be JP |
177 | NLA_S8, |
178 | NLA_S16, | |
179 | NLA_S32, | |
180 | NLA_S64, | |
bfa83a9e TG |
181 | __NLA_TYPE_MAX, |
182 | }; | |
183 | ||
184 | #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) | |
185 | ||
186 | /** | |
187 | * struct nla_policy - attribute validation policy | |
188 | * @type: Type of attribute or NLA_UNSPEC | |
a5531a5d | 189 | * @len: Type specific length of payload |
bfa83a9e TG |
190 | * |
191 | * Policies are defined as arrays of this struct, the array must be | |
192 | * accessible by attribute type up to the highest identifier to be expected. | |
193 | * | |
a5531a5d TG |
194 | * Meaning of `len' field: |
195 | * NLA_STRING Maximum length of string | |
196 | * NLA_NUL_STRING Maximum length of string (excluding NUL) | |
197 | * NLA_FLAG Unused | |
d30045a0 | 198 | * NLA_BINARY Maximum length of attribute payload |
4b6cc728 JB |
199 | * NLA_NESTED Don't use `len' field -- length verification is |
200 | * done by checking len of nested header (or empty) | |
201 | * NLA_NESTED_COMPAT Minimum length of structure payload | |
202 | * NLA_U8, NLA_U16, | |
203 | * NLA_U32, NLA_U64, | |
4778e0be JP |
204 | * NLA_S8, NLA_S16, |
205 | * NLA_S32, NLA_S64, | |
4b6cc728 JB |
206 | * NLA_MSECS Leaving the length field zero will verify the |
207 | * given type fits, using it verifies minimum length | |
208 | * just like "All other" | |
209 | * All other Minimum length of attribute payload | |
a5531a5d | 210 | * |
bfa83a9e | 211 | * Example: |
b54452b0 | 212 | * static const struct nla_policy my_policy[ATTR_MAX+1] = { |
bfa83a9e | 213 | * [ATTR_FOO] = { .type = NLA_U16 }, |
d30045a0 | 214 | * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, |
a5531a5d | 215 | * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
bfa83a9e TG |
216 | * }; |
217 | */ | |
218 | struct nla_policy { | |
219 | u16 type; | |
a5531a5d | 220 | u16 len; |
bfa83a9e TG |
221 | }; |
222 | ||
4e902c57 TG |
223 | /** |
224 | * struct nl_info - netlink source information | |
225 | * @nlh: Netlink message header of original request | |
15e47304 | 226 | * @portid: Netlink PORTID of requesting application |
4e902c57 TG |
227 | */ |
228 | struct nl_info { | |
229 | struct nlmsghdr *nlh; | |
4d1169c1 | 230 | struct net *nl_net; |
15e47304 | 231 | u32 portid; |
4e902c57 TG |
232 | }; |
233 | ||
4f69053b JP |
234 | int netlink_rcv_skb(struct sk_buff *skb, |
235 | int (*cb)(struct sk_buff *, struct nlmsghdr *)); | |
236 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, | |
237 | unsigned int group, int report, gfp_t flags); | |
82ace47a | 238 | |
4f69053b JP |
239 | int nla_validate(const struct nlattr *head, int len, int maxtype, |
240 | const struct nla_policy *policy); | |
241 | int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, | |
242 | int len, const struct nla_policy *policy); | |
243 | int nla_policy_len(const struct nla_policy *, int); | |
244 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); | |
245 | size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); | |
246 | int nla_memcpy(void *dest, const struct nlattr *src, int count); | |
247 | int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); | |
248 | int nla_strcmp(const struct nlattr *nla, const char *str); | |
249 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
089bf1a6 ND |
250 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
251 | int attrlen, int padattr); | |
4f69053b JP |
252 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
253 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
089bf1a6 ND |
254 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
255 | int attrlen, int padattr); | |
4f69053b JP |
256 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
257 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
258 | const void *data); | |
089bf1a6 ND |
259 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
260 | const void *data, int padattr); | |
4f69053b JP |
261 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
262 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); | |
089bf1a6 ND |
263 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
264 | const void *data, int padattr); | |
4f69053b JP |
265 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
266 | int nla_append(struct sk_buff *skb, int attrlen, const void *data); | |
bfa83a9e TG |
267 | |
268 | /************************************************************************** | |
269 | * Netlink Messages | |
270 | **************************************************************************/ | |
271 | ||
272 | /** | |
273 | * nlmsg_msg_size - length of netlink message not including padding | |
274 | * @payload: length of message payload | |
275 | */ | |
276 | static inline int nlmsg_msg_size(int payload) | |
277 | { | |
278 | return NLMSG_HDRLEN + payload; | |
279 | } | |
280 | ||
281 | /** | |
282 | * nlmsg_total_size - length of netlink message including padding | |
283 | * @payload: length of message payload | |
284 | */ | |
285 | static inline int nlmsg_total_size(int payload) | |
286 | { | |
287 | return NLMSG_ALIGN(nlmsg_msg_size(payload)); | |
288 | } | |
289 | ||
290 | /** | |
291 | * nlmsg_padlen - length of padding at the message's tail | |
292 | * @payload: length of message payload | |
293 | */ | |
294 | static inline int nlmsg_padlen(int payload) | |
295 | { | |
296 | return nlmsg_total_size(payload) - nlmsg_msg_size(payload); | |
297 | } | |
298 | ||
299 | /** | |
300 | * nlmsg_data - head of message payload | |
70f23fd6 | 301 | * @nlh: netlink message header |
bfa83a9e TG |
302 | */ |
303 | static inline void *nlmsg_data(const struct nlmsghdr *nlh) | |
304 | { | |
305 | return (unsigned char *) nlh + NLMSG_HDRLEN; | |
306 | } | |
307 | ||
308 | /** | |
309 | * nlmsg_len - length of message payload | |
310 | * @nlh: netlink message header | |
311 | */ | |
312 | static inline int nlmsg_len(const struct nlmsghdr *nlh) | |
313 | { | |
314 | return nlh->nlmsg_len - NLMSG_HDRLEN; | |
315 | } | |
316 | ||
317 | /** | |
318 | * nlmsg_attrdata - head of attributes data | |
319 | * @nlh: netlink message header | |
320 | * @hdrlen: length of family specific header | |
321 | */ | |
322 | static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, | |
323 | int hdrlen) | |
324 | { | |
325 | unsigned char *data = nlmsg_data(nlh); | |
326 | return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); | |
327 | } | |
328 | ||
329 | /** | |
330 | * nlmsg_attrlen - length of attributes data | |
331 | * @nlh: netlink message header | |
332 | * @hdrlen: length of family specific header | |
333 | */ | |
334 | static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) | |
335 | { | |
336 | return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); | |
337 | } | |
338 | ||
339 | /** | |
340 | * nlmsg_ok - check if the netlink message fits into the remaining bytes | |
341 | * @nlh: netlink message header | |
342 | * @remaining: number of bytes remaining in message stream | |
343 | */ | |
344 | static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) | |
345 | { | |
619e803d | 346 | return (remaining >= (int) sizeof(struct nlmsghdr) && |
bfa83a9e TG |
347 | nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
348 | nlh->nlmsg_len <= remaining); | |
349 | } | |
350 | ||
351 | /** | |
352 | * nlmsg_next - next netlink message in message stream | |
353 | * @nlh: netlink message header | |
354 | * @remaining: number of bytes remaining in message stream | |
355 | * | |
356 | * Returns the next netlink message in the message stream and | |
357 | * decrements remaining by the size of the current message. | |
358 | */ | |
3654654f JE |
359 | static inline struct nlmsghdr * |
360 | nlmsg_next(const struct nlmsghdr *nlh, int *remaining) | |
bfa83a9e TG |
361 | { |
362 | int totlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
363 | ||
364 | *remaining -= totlen; | |
365 | ||
366 | return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); | |
367 | } | |
368 | ||
369 | /** | |
370 | * nlmsg_parse - parse attributes of a netlink message | |
371 | * @nlh: netlink message header | |
372 | * @hdrlen: length of family specific header | |
373 | * @tb: destination array with maxtype+1 elements | |
374 | * @maxtype: maximum attribute type to be expected | |
375 | * @policy: validation policy | |
376 | * | |
377 | * See nla_parse() | |
378 | */ | |
3a6c2b41 | 379 | static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, |
bfa83a9e | 380 | struct nlattr *tb[], int maxtype, |
ef7c79ed | 381 | const struct nla_policy *policy) |
bfa83a9e TG |
382 | { |
383 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
384 | return -EINVAL; | |
385 | ||
386 | return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), | |
387 | nlmsg_attrlen(nlh, hdrlen), policy); | |
388 | } | |
389 | ||
390 | /** | |
391 | * nlmsg_find_attr - find a specific attribute in a netlink message | |
392 | * @nlh: netlink message header | |
393 | * @hdrlen: length of familiy specific header | |
394 | * @attrtype: type of attribute to look for | |
395 | * | |
396 | * Returns the first attribute which matches the specified type. | |
397 | */ | |
6b8c92ba | 398 | static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, |
bfa83a9e TG |
399 | int hdrlen, int attrtype) |
400 | { | |
401 | return nla_find(nlmsg_attrdata(nlh, hdrlen), | |
402 | nlmsg_attrlen(nlh, hdrlen), attrtype); | |
403 | } | |
404 | ||
405 | /** | |
406 | * nlmsg_validate - validate a netlink message including attributes | |
407 | * @nlh: netlinket message header | |
408 | * @hdrlen: length of familiy specific header | |
409 | * @maxtype: maximum attribute type to be expected | |
410 | * @policy: validation policy | |
411 | */ | |
3654654f JE |
412 | static inline int nlmsg_validate(const struct nlmsghdr *nlh, |
413 | int hdrlen, int maxtype, | |
ef7c79ed | 414 | const struct nla_policy *policy) |
bfa83a9e TG |
415 | { |
416 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
417 | return -EINVAL; | |
418 | ||
419 | return nla_validate(nlmsg_attrdata(nlh, hdrlen), | |
420 | nlmsg_attrlen(nlh, hdrlen), maxtype, policy); | |
421 | } | |
422 | ||
97676b6b TG |
423 | /** |
424 | * nlmsg_report - need to report back to application? | |
425 | * @nlh: netlink message header | |
426 | * | |
427 | * Returns 1 if a report back to the application is requested. | |
428 | */ | |
3a6c2b41 | 429 | static inline int nlmsg_report(const struct nlmsghdr *nlh) |
97676b6b TG |
430 | { |
431 | return !!(nlh->nlmsg_flags & NLM_F_ECHO); | |
432 | } | |
433 | ||
bfa83a9e TG |
434 | /** |
435 | * nlmsg_for_each_attr - iterate over a stream of attributes | |
436 | * @pos: loop counter, set to current attribute | |
437 | * @nlh: netlink message header | |
438 | * @hdrlen: length of familiy specific header | |
439 | * @rem: initialized to len, holds bytes currently remaining in stream | |
440 | */ | |
441 | #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ | |
442 | nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ | |
443 | nlmsg_attrlen(nlh, hdrlen), rem) | |
444 | ||
bfa83a9e TG |
445 | /** |
446 | * nlmsg_put - Add a new netlink message to an skb | |
447 | * @skb: socket buffer to store message in | |
2c6ba4b1 | 448 | * @portid: netlink PORTID of requesting application |
bfa83a9e TG |
449 | * @seq: sequence number of message |
450 | * @type: message type | |
451 | * @payload: length of message payload | |
452 | * @flags: message flags | |
453 | * | |
454 | * Returns NULL if the tailroom of the skb is insufficient to store | |
455 | * the message header and payload. | |
456 | */ | |
15e47304 | 457 | static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
bfa83a9e TG |
458 | int type, int payload, int flags) |
459 | { | |
460 | if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) | |
461 | return NULL; | |
462 | ||
15e47304 | 463 | return __nlmsg_put(skb, portid, seq, type, payload, flags); |
bfa83a9e TG |
464 | } |
465 | ||
466 | /** | |
467 | * nlmsg_put_answer - Add a new callback based netlink message to an skb | |
468 | * @skb: socket buffer to store message in | |
469 | * @cb: netlink callback | |
470 | * @type: message type | |
471 | * @payload: length of message payload | |
472 | * @flags: message flags | |
473 | * | |
474 | * Returns NULL if the tailroom of the skb is insufficient to store | |
475 | * the message header and payload. | |
476 | */ | |
477 | static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, | |
478 | struct netlink_callback *cb, | |
479 | int type, int payload, | |
480 | int flags) | |
481 | { | |
15e47304 | 482 | return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
bfa83a9e TG |
483 | type, payload, flags); |
484 | } | |
485 | ||
486 | /** | |
487 | * nlmsg_new - Allocate a new netlink message | |
339bf98f | 488 | * @payload: size of the message payload |
fe4944e5 | 489 | * @flags: the type of memory to allocate. |
bfa83a9e | 490 | * |
339bf98f TG |
491 | * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
492 | * and a good default is needed. | |
bfa83a9e | 493 | */ |
339bf98f | 494 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
bfa83a9e | 495 | { |
339bf98f | 496 | return alloc_skb(nlmsg_total_size(payload), flags); |
bfa83a9e TG |
497 | } |
498 | ||
499 | /** | |
500 | * nlmsg_end - Finalize a netlink message | |
501 | * @skb: socket buffer the message is stored in | |
502 | * @nlh: netlink message header | |
503 | * | |
504 | * Corrects the netlink message header to include the appeneded | |
505 | * attributes. Only necessary if attributes have been added to | |
506 | * the message. | |
bfa83a9e | 507 | */ |
053c095a | 508 | static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 509 | { |
27a884dc | 510 | nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
bfa83a9e TG |
511 | } |
512 | ||
fe4944e5 TG |
513 | /** |
514 | * nlmsg_get_pos - return current position in netlink message | |
515 | * @skb: socket buffer the message is stored in | |
516 | * | |
517 | * Returns a pointer to the current tail of the message. | |
518 | */ | |
519 | static inline void *nlmsg_get_pos(struct sk_buff *skb) | |
520 | { | |
27a884dc | 521 | return skb_tail_pointer(skb); |
fe4944e5 TG |
522 | } |
523 | ||
524 | /** | |
525 | * nlmsg_trim - Trim message to a mark | |
526 | * @skb: socket buffer the message is stored in | |
527 | * @mark: mark to trim to | |
528 | * | |
bc3ed28c | 529 | * Trims the message to the provided mark. |
fe4944e5 | 530 | */ |
bc3ed28c | 531 | static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) |
fe4944e5 | 532 | { |
149118d8 TG |
533 | if (mark) { |
534 | WARN_ON((unsigned char *) mark < skb->data); | |
fe4944e5 | 535 | skb_trim(skb, (unsigned char *) mark - skb->data); |
149118d8 | 536 | } |
fe4944e5 TG |
537 | } |
538 | ||
bfa83a9e TG |
539 | /** |
540 | * nlmsg_cancel - Cancel construction of a netlink message | |
541 | * @skb: socket buffer the message is stored in | |
542 | * @nlh: netlink message header | |
543 | * | |
544 | * Removes the complete netlink message including all | |
bc3ed28c | 545 | * attributes from the socket buffer again. |
bfa83a9e | 546 | */ |
bc3ed28c | 547 | static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 548 | { |
bc3ed28c | 549 | nlmsg_trim(skb, nlh); |
bfa83a9e TG |
550 | } |
551 | ||
552 | /** | |
553 | * nlmsg_free - free a netlink message | |
554 | * @skb: socket buffer of netlink message | |
555 | */ | |
556 | static inline void nlmsg_free(struct sk_buff *skb) | |
557 | { | |
558 | kfree_skb(skb); | |
559 | } | |
560 | ||
561 | /** | |
562 | * nlmsg_multicast - multicast a netlink message | |
563 | * @sk: netlink socket to spread messages to | |
564 | * @skb: netlink message as socket buffer | |
15e47304 | 565 | * @portid: own netlink portid to avoid sending to yourself |
bfa83a9e | 566 | * @group: multicast group id |
d387f6ad | 567 | * @flags: allocation flags |
bfa83a9e TG |
568 | */ |
569 | static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, | |
15e47304 | 570 | u32 portid, unsigned int group, gfp_t flags) |
bfa83a9e TG |
571 | { |
572 | int err; | |
573 | ||
574 | NETLINK_CB(skb).dst_group = group; | |
575 | ||
15e47304 | 576 | err = netlink_broadcast(sk, skb, portid, group, flags); |
bfa83a9e TG |
577 | if (err > 0) |
578 | err = 0; | |
579 | ||
580 | return err; | |
581 | } | |
582 | ||
583 | /** | |
584 | * nlmsg_unicast - unicast a netlink message | |
585 | * @sk: netlink socket to spread message to | |
586 | * @skb: netlink message as socket buffer | |
15e47304 | 587 | * @portid: netlink portid of the destination socket |
bfa83a9e | 588 | */ |
15e47304 | 589 | static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) |
bfa83a9e TG |
590 | { |
591 | int err; | |
592 | ||
15e47304 | 593 | err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); |
bfa83a9e TG |
594 | if (err > 0) |
595 | err = 0; | |
596 | ||
597 | return err; | |
598 | } | |
599 | ||
600 | /** | |
601 | * nlmsg_for_each_msg - iterate over a stream of messages | |
602 | * @pos: loop counter, set to current message | |
603 | * @head: head of message stream | |
604 | * @len: length of message stream | |
605 | * @rem: initialized to len, holds bytes currently remaining in stream | |
606 | */ | |
607 | #define nlmsg_for_each_msg(pos, head, len, rem) \ | |
608 | for (pos = head, rem = len; \ | |
609 | nlmsg_ok(pos, rem); \ | |
610 | pos = nlmsg_next(pos, &(rem))) | |
611 | ||
670dc283 JB |
612 | /** |
613 | * nl_dump_check_consistent - check if sequence is consistent and advertise if not | |
614 | * @cb: netlink callback structure that stores the sequence number | |
615 | * @nlh: netlink message header to write the flag to | |
616 | * | |
617 | * This function checks if the sequence (generation) number changed during dump | |
618 | * and if it did, advertises it in the netlink message header. | |
619 | * | |
620 | * The correct way to use it is to set cb->seq to the generation counter when | |
621 | * all locks for dumping have been acquired, and then call this function for | |
622 | * each message that is generated. | |
623 | * | |
624 | * Note that due to initialisation concerns, 0 is an invalid sequence number | |
625 | * and must not be used by code that uses this functionality. | |
626 | */ | |
627 | static inline void | |
628 | nl_dump_check_consistent(struct netlink_callback *cb, | |
629 | struct nlmsghdr *nlh) | |
630 | { | |
631 | if (cb->prev_seq && cb->seq != cb->prev_seq) | |
632 | nlh->nlmsg_flags |= NLM_F_DUMP_INTR; | |
633 | cb->prev_seq = cb->seq; | |
634 | } | |
635 | ||
bfa83a9e TG |
636 | /************************************************************************** |
637 | * Netlink Attributes | |
638 | **************************************************************************/ | |
639 | ||
640 | /** | |
641 | * nla_attr_size - length of attribute not including padding | |
642 | * @payload: length of payload | |
643 | */ | |
644 | static inline int nla_attr_size(int payload) | |
645 | { | |
646 | return NLA_HDRLEN + payload; | |
647 | } | |
648 | ||
649 | /** | |
650 | * nla_total_size - total length of attribute including padding | |
651 | * @payload: length of payload | |
652 | */ | |
653 | static inline int nla_total_size(int payload) | |
654 | { | |
655 | return NLA_ALIGN(nla_attr_size(payload)); | |
656 | } | |
657 | ||
658 | /** | |
659 | * nla_padlen - length of padding at the tail of attribute | |
660 | * @payload: length of payload | |
661 | */ | |
662 | static inline int nla_padlen(int payload) | |
663 | { | |
664 | return nla_total_size(payload) - nla_attr_size(payload); | |
665 | } | |
666 | ||
8f4c1f9b TG |
667 | /** |
668 | * nla_type - attribute type | |
669 | * @nla: netlink attribute | |
670 | */ | |
671 | static inline int nla_type(const struct nlattr *nla) | |
672 | { | |
673 | return nla->nla_type & NLA_TYPE_MASK; | |
674 | } | |
675 | ||
bfa83a9e TG |
676 | /** |
677 | * nla_data - head of payload | |
678 | * @nla: netlink attribute | |
679 | */ | |
680 | static inline void *nla_data(const struct nlattr *nla) | |
681 | { | |
682 | return (char *) nla + NLA_HDRLEN; | |
683 | } | |
684 | ||
685 | /** | |
686 | * nla_len - length of payload | |
687 | * @nla: netlink attribute | |
688 | */ | |
689 | static inline int nla_len(const struct nlattr *nla) | |
690 | { | |
691 | return nla->nla_len - NLA_HDRLEN; | |
692 | } | |
693 | ||
694 | /** | |
695 | * nla_ok - check if the netlink attribute fits into the remaining bytes | |
696 | * @nla: netlink attribute | |
697 | * @remaining: number of bytes remaining in attribute stream | |
698 | */ | |
699 | static inline int nla_ok(const struct nlattr *nla, int remaining) | |
700 | { | |
1045b03e | 701 | return remaining >= (int) sizeof(*nla) && |
bfa83a9e TG |
702 | nla->nla_len >= sizeof(*nla) && |
703 | nla->nla_len <= remaining; | |
704 | } | |
705 | ||
706 | /** | |
d1ec3b77 | 707 | * nla_next - next netlink attribute in attribute stream |
bfa83a9e TG |
708 | * @nla: netlink attribute |
709 | * @remaining: number of bytes remaining in attribute stream | |
710 | * | |
711 | * Returns the next netlink attribute in the attribute stream and | |
712 | * decrements remaining by the size of the current attribute. | |
713 | */ | |
714 | static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) | |
715 | { | |
716 | int totlen = NLA_ALIGN(nla->nla_len); | |
717 | ||
718 | *remaining -= totlen; | |
719 | return (struct nlattr *) ((char *) nla + totlen); | |
720 | } | |
721 | ||
fe4944e5 TG |
722 | /** |
723 | * nla_find_nested - find attribute in a set of nested attributes | |
724 | * @nla: attribute containing the nested attributes | |
725 | * @attrtype: type of attribute to look for | |
726 | * | |
727 | * Returns the first attribute which matches the specified type. | |
728 | */ | |
3654654f JE |
729 | static inline struct nlattr * |
730 | nla_find_nested(const struct nlattr *nla, int attrtype) | |
fe4944e5 TG |
731 | { |
732 | return nla_find(nla_data(nla), nla_len(nla), attrtype); | |
733 | } | |
734 | ||
bfa83a9e TG |
735 | /** |
736 | * nla_parse_nested - parse nested attributes | |
737 | * @tb: destination array with maxtype+1 elements | |
738 | * @maxtype: maximum attribute type to be expected | |
739 | * @nla: attribute containing the nested attributes | |
740 | * @policy: validation policy | |
741 | * | |
742 | * See nla_parse() | |
743 | */ | |
744 | static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, | |
b057efd4 | 745 | const struct nlattr *nla, |
ef7c79ed | 746 | const struct nla_policy *policy) |
bfa83a9e TG |
747 | { |
748 | return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy); | |
749 | } | |
1092cb21 | 750 | |
bfa83a9e | 751 | /** |
d1ec3b77 | 752 | * nla_put_u8 - Add a u8 netlink attribute to a socket buffer |
bfa83a9e TG |
753 | * @skb: socket buffer to add attribute to |
754 | * @attrtype: attribute type | |
755 | * @value: numeric value | |
756 | */ | |
757 | static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) | |
758 | { | |
759 | return nla_put(skb, attrtype, sizeof(u8), &value); | |
760 | } | |
761 | ||
762 | /** | |
763 | * nla_put_u16 - Add a u16 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_u16(struct sk_buff *skb, int attrtype, u16 value) | |
769 | { | |
770 | return nla_put(skb, attrtype, sizeof(u16), &value); | |
771 | } | |
772 | ||
569a8fc3 DM |
773 | /** |
774 | * nla_put_be16 - Add a __be16 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_be16(struct sk_buff *skb, int attrtype, __be16 value) | |
780 | { | |
781 | return nla_put(skb, attrtype, sizeof(__be16), &value); | |
782 | } | |
783 | ||
6c1dd3b6 DM |
784 | /** |
785 | * nla_put_net16 - Add 16-bit network byte order 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_net16(struct sk_buff *skb, int attrtype, __be16 value) | |
791 | { | |
792 | return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
793 | } | |
794 | ||
24c410dc DM |
795 | /** |
796 | * nla_put_le16 - Add a __le16 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_le16(struct sk_buff *skb, int attrtype, __le16 value) | |
802 | { | |
803 | return nla_put(skb, attrtype, sizeof(__le16), &value); | |
804 | } | |
805 | ||
bfa83a9e TG |
806 | /** |
807 | * nla_put_u32 - Add a u32 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_u32(struct sk_buff *skb, int attrtype, u32 value) | |
813 | { | |
814 | return nla_put(skb, attrtype, sizeof(u32), &value); | |
815 | } | |
816 | ||
817 | /** | |
569a8fc3 DM |
818 | * nla_put_be32 - Add a __be32 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_be32(struct sk_buff *skb, int attrtype, __be32 value) | |
824 | { | |
825 | return nla_put(skb, attrtype, sizeof(__be32), &value); | |
826 | } | |
827 | ||
6c1dd3b6 DM |
828 | /** |
829 | * nla_put_net32 - Add 32-bit network byte order 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_net32(struct sk_buff *skb, int attrtype, __be32 value) | |
835 | { | |
836 | return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
837 | } | |
838 | ||
24c410dc DM |
839 | /** |
840 | * nla_put_le32 - Add a __le32 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_le32(struct sk_buff *skb, int attrtype, __le32 value) | |
846 | { | |
847 | return nla_put(skb, attrtype, sizeof(__le32), &value); | |
848 | } | |
849 | ||
73520786 ND |
850 | /** |
851 | * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it | |
852 | * @skb: socket buffer to add attribute to | |
853 | * @attrtype: attribute type | |
854 | * @value: numeric value | |
855 | * @padattr: attribute type for the padding | |
856 | */ | |
857 | static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, | |
858 | u64 value, int padattr) | |
859 | { | |
860 | return nla_put_64bit(skb, attrtype, sizeof(u64), &value, padattr); | |
861 | } | |
862 | ||
569a8fc3 | 863 | /** |
b46f6ded | 864 | * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it |
569a8fc3 DM |
865 | * @skb: socket buffer to add attribute to |
866 | * @attrtype: attribute type | |
867 | * @value: numeric value | |
b46f6ded | 868 | * @padattr: attribute type for the padding |
569a8fc3 | 869 | */ |
b46f6ded ND |
870 | static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, |
871 | int padattr) | |
569a8fc3 | 872 | { |
b46f6ded | 873 | return nla_put_64bit(skb, attrtype, sizeof(__be64), &value, padattr); |
569a8fc3 DM |
874 | } |
875 | ||
6c1dd3b6 | 876 | /** |
e9bbe898 | 877 | * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it |
6c1dd3b6 DM |
878 | * @skb: socket buffer to add attribute to |
879 | * @attrtype: attribute type | |
880 | * @value: numeric value | |
e9bbe898 | 881 | * @padattr: attribute type for the padding |
6c1dd3b6 | 882 | */ |
e9bbe898 ND |
883 | static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, |
884 | int padattr) | |
6c1dd3b6 | 885 | { |
e9bbe898 ND |
886 | return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value, |
887 | padattr); | |
6c1dd3b6 DM |
888 | } |
889 | ||
24c410dc | 890 | /** |
e7479122 | 891 | * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it |
24c410dc DM |
892 | * @skb: socket buffer to add attribute to |
893 | * @attrtype: attribute type | |
894 | * @value: numeric value | |
e7479122 | 895 | * @padattr: attribute type for the padding |
24c410dc | 896 | */ |
e7479122 ND |
897 | static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, |
898 | int padattr) | |
24c410dc | 899 | { |
e7479122 | 900 | return nla_put_64bit(skb, attrtype, sizeof(__le64), &value, padattr); |
24c410dc DM |
901 | } |
902 | ||
4778e0be JP |
903 | /** |
904 | * nla_put_s8 - Add a s8 netlink attribute to a socket buffer | |
905 | * @skb: socket buffer to add attribute to | |
906 | * @attrtype: attribute type | |
907 | * @value: numeric value | |
908 | */ | |
909 | static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) | |
910 | { | |
911 | return nla_put(skb, attrtype, sizeof(s8), &value); | |
912 | } | |
913 | ||
914 | /** | |
915 | * nla_put_s16 - Add a s16 netlink attribute to a socket buffer | |
916 | * @skb: socket buffer to add attribute to | |
917 | * @attrtype: attribute type | |
918 | * @value: numeric value | |
919 | */ | |
920 | static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) | |
921 | { | |
922 | return nla_put(skb, attrtype, sizeof(s16), &value); | |
923 | } | |
924 | ||
925 | /** | |
926 | * nla_put_s32 - Add a s32 netlink attribute to a socket buffer | |
927 | * @skb: socket buffer to add attribute to | |
928 | * @attrtype: attribute type | |
929 | * @value: numeric value | |
930 | */ | |
931 | static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) | |
932 | { | |
933 | return nla_put(skb, attrtype, sizeof(s32), &value); | |
934 | } | |
935 | ||
936 | /** | |
756a2f59 | 937 | * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it |
4778e0be JP |
938 | * @skb: socket buffer to add attribute to |
939 | * @attrtype: attribute type | |
940 | * @value: numeric value | |
756a2f59 | 941 | * @padattr: attribute type for the padding |
4778e0be | 942 | */ |
756a2f59 ND |
943 | static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, |
944 | int padattr) | |
4778e0be | 945 | { |
756a2f59 | 946 | return nla_put_64bit(skb, attrtype, sizeof(s64), &value, padattr); |
4778e0be JP |
947 | } |
948 | ||
bfa83a9e TG |
949 | /** |
950 | * nla_put_string - Add a string netlink attribute to a socket buffer | |
951 | * @skb: socket buffer to add attribute to | |
952 | * @attrtype: attribute type | |
953 | * @str: NUL terminated string | |
954 | */ | |
955 | static inline int nla_put_string(struct sk_buff *skb, int attrtype, | |
956 | const char *str) | |
957 | { | |
958 | return nla_put(skb, attrtype, strlen(str) + 1, str); | |
959 | } | |
960 | ||
961 | /** | |
962 | * nla_put_flag - Add a flag netlink attribute to a socket buffer | |
963 | * @skb: socket buffer to add attribute to | |
964 | * @attrtype: attribute type | |
965 | */ | |
966 | static inline int nla_put_flag(struct sk_buff *skb, int attrtype) | |
967 | { | |
968 | return nla_put(skb, attrtype, 0, NULL); | |
969 | } | |
970 | ||
971 | /** | |
2175d87c | 972 | * nla_put_msecs - Add a msecs netlink attribute to a skb and align it |
bfa83a9e TG |
973 | * @skb: socket buffer to add attribute to |
974 | * @attrtype: attribute type | |
d87de1f3 | 975 | * @njiffies: number of jiffies to convert to msecs |
2175d87c | 976 | * @padattr: attribute type for the padding |
bfa83a9e TG |
977 | */ |
978 | static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, | |
2175d87c | 979 | unsigned long njiffies, int padattr) |
bfa83a9e | 980 | { |
d87de1f3 | 981 | u64 tmp = jiffies_to_msecs(njiffies); |
2175d87c ND |
982 | |
983 | return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); | |
bfa83a9e TG |
984 | } |
985 | ||
930345ea JB |
986 | /** |
987 | * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket | |
988 | * buffer | |
989 | * @skb: socket buffer to add attribute to | |
990 | * @attrtype: attribute type | |
991 | * @addr: IPv4 address | |
992 | */ | |
993 | static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, | |
994 | __be32 addr) | |
995 | { | |
996 | return nla_put_be32(skb, attrtype, addr); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket | |
1001 | * buffer | |
1002 | * @skb: socket buffer to add attribute to | |
1003 | * @attrtype: attribute type | |
1004 | * @addr: IPv6 address | |
1005 | */ | |
1006 | static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, | |
1007 | const struct in6_addr *addr) | |
1008 | { | |
1009 | return nla_put(skb, attrtype, sizeof(*addr), addr); | |
1010 | } | |
1011 | ||
bfa83a9e TG |
1012 | /** |
1013 | * nla_get_u32 - return payload of u32 attribute | |
1014 | * @nla: u32 netlink attribute | |
1015 | */ | |
b057efd4 | 1016 | static inline u32 nla_get_u32(const struct nlattr *nla) |
bfa83a9e TG |
1017 | { |
1018 | return *(u32 *) nla_data(nla); | |
1019 | } | |
1020 | ||
00012e5b AV |
1021 | /** |
1022 | * nla_get_be32 - return payload of __be32 attribute | |
1023 | * @nla: __be32 netlink attribute | |
1024 | */ | |
b057efd4 | 1025 | static inline __be32 nla_get_be32(const struct nlattr *nla) |
00012e5b AV |
1026 | { |
1027 | return *(__be32 *) nla_data(nla); | |
1028 | } | |
1029 | ||
c648a013 AA |
1030 | /** |
1031 | * nla_get_le32 - return payload of __le32 attribute | |
1032 | * @nla: __le32 netlink attribute | |
1033 | */ | |
1034 | static inline __le32 nla_get_le32(const struct nlattr *nla) | |
1035 | { | |
1036 | return *(__le32 *) nla_data(nla); | |
1037 | } | |
1038 | ||
bfa83a9e TG |
1039 | /** |
1040 | * nla_get_u16 - return payload of u16 attribute | |
1041 | * @nla: u16 netlink attribute | |
1042 | */ | |
b057efd4 | 1043 | static inline u16 nla_get_u16(const struct nlattr *nla) |
bfa83a9e TG |
1044 | { |
1045 | return *(u16 *) nla_data(nla); | |
1046 | } | |
1047 | ||
838965ba PM |
1048 | /** |
1049 | * nla_get_be16 - return payload of __be16 attribute | |
1050 | * @nla: __be16 netlink attribute | |
1051 | */ | |
b057efd4 | 1052 | static inline __be16 nla_get_be16(const struct nlattr *nla) |
838965ba PM |
1053 | { |
1054 | return *(__be16 *) nla_data(nla); | |
1055 | } | |
1056 | ||
4a89c256 TG |
1057 | /** |
1058 | * nla_get_le16 - return payload of __le16 attribute | |
1059 | * @nla: __le16 netlink attribute | |
1060 | */ | |
b057efd4 | 1061 | static inline __le16 nla_get_le16(const struct nlattr *nla) |
4a89c256 TG |
1062 | { |
1063 | return *(__le16 *) nla_data(nla); | |
1064 | } | |
1065 | ||
bfa83a9e TG |
1066 | /** |
1067 | * nla_get_u8 - return payload of u8 attribute | |
1068 | * @nla: u8 netlink attribute | |
1069 | */ | |
b057efd4 | 1070 | static inline u8 nla_get_u8(const struct nlattr *nla) |
bfa83a9e TG |
1071 | { |
1072 | return *(u8 *) nla_data(nla); | |
1073 | } | |
1074 | ||
1075 | /** | |
1076 | * nla_get_u64 - return payload of u64 attribute | |
1077 | * @nla: u64 netlink attribute | |
1078 | */ | |
b057efd4 | 1079 | static inline u64 nla_get_u64(const struct nlattr *nla) |
bfa83a9e TG |
1080 | { |
1081 | u64 tmp; | |
1082 | ||
1083 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1084 | ||
1085 | return tmp; | |
1086 | } | |
1087 | ||
a17c8598 PNA |
1088 | /** |
1089 | * nla_get_be64 - return payload of __be64 attribute | |
1090 | * @nla: __be64 netlink attribute | |
1091 | */ | |
1092 | static inline __be64 nla_get_be64(const struct nlattr *nla) | |
1093 | { | |
f5d410f2 PNA |
1094 | __be64 tmp; |
1095 | ||
1096 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1097 | ||
4778e0be JP |
1098 | return tmp; |
1099 | } | |
1100 | ||
c648a013 AA |
1101 | /** |
1102 | * nla_get_le64 - return payload of __le64 attribute | |
1103 | * @nla: __le64 netlink attribute | |
1104 | */ | |
1105 | static inline __le64 nla_get_le64(const struct nlattr *nla) | |
1106 | { | |
1107 | return *(__le64 *) nla_data(nla); | |
1108 | } | |
1109 | ||
4778e0be JP |
1110 | /** |
1111 | * nla_get_s32 - return payload of s32 attribute | |
1112 | * @nla: s32 netlink attribute | |
1113 | */ | |
1114 | static inline s32 nla_get_s32(const struct nlattr *nla) | |
1115 | { | |
1116 | return *(s32 *) nla_data(nla); | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * nla_get_s16 - return payload of s16 attribute | |
1121 | * @nla: s16 netlink attribute | |
1122 | */ | |
1123 | static inline s16 nla_get_s16(const struct nlattr *nla) | |
1124 | { | |
1125 | return *(s16 *) nla_data(nla); | |
1126 | } | |
1127 | ||
1128 | /** | |
1129 | * nla_get_s8 - return payload of s8 attribute | |
1130 | * @nla: s8 netlink attribute | |
1131 | */ | |
1132 | static inline s8 nla_get_s8(const struct nlattr *nla) | |
1133 | { | |
1134 | return *(s8 *) nla_data(nla); | |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * nla_get_s64 - return payload of s64 attribute | |
1139 | * @nla: s64 netlink attribute | |
1140 | */ | |
1141 | static inline s64 nla_get_s64(const struct nlattr *nla) | |
1142 | { | |
1143 | s64 tmp; | |
1144 | ||
1145 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1146 | ||
f5d410f2 | 1147 | return tmp; |
a17c8598 PNA |
1148 | } |
1149 | ||
bfa83a9e TG |
1150 | /** |
1151 | * nla_get_flag - return payload of flag attribute | |
1152 | * @nla: flag netlink attribute | |
1153 | */ | |
b057efd4 | 1154 | static inline int nla_get_flag(const struct nlattr *nla) |
bfa83a9e TG |
1155 | { |
1156 | return !!nla; | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * nla_get_msecs - return payload of msecs attribute | |
1161 | * @nla: msecs netlink attribute | |
1162 | * | |
1163 | * Returns the number of milliseconds in jiffies. | |
1164 | */ | |
b057efd4 | 1165 | static inline unsigned long nla_get_msecs(const struct nlattr *nla) |
bfa83a9e TG |
1166 | { |
1167 | u64 msecs = nla_get_u64(nla); | |
1168 | ||
1169 | return msecs_to_jiffies((unsigned long) msecs); | |
1170 | } | |
1171 | ||
67b61f6c JB |
1172 | /** |
1173 | * nla_get_in_addr - return payload of IPv4 address attribute | |
1174 | * @nla: IPv4 address netlink attribute | |
1175 | */ | |
1176 | static inline __be32 nla_get_in_addr(const struct nlattr *nla) | |
1177 | { | |
1178 | return *(__be32 *) nla_data(nla); | |
1179 | } | |
1180 | ||
1181 | /** | |
1182 | * nla_get_in6_addr - return payload of IPv6 address attribute | |
1183 | * @nla: IPv6 address netlink attribute | |
1184 | */ | |
1185 | static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) | |
1186 | { | |
1187 | struct in6_addr tmp; | |
1188 | ||
1189 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1190 | return tmp; | |
1191 | } | |
1192 | ||
bfa83a9e TG |
1193 | /** |
1194 | * nla_nest_start - Start a new level of nested attributes | |
1195 | * @skb: socket buffer to add attributes to | |
1196 | * @attrtype: attribute type of container | |
1197 | * | |
1198 | * Returns the container attribute | |
1199 | */ | |
1200 | static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) | |
1201 | { | |
27a884dc | 1202 | struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
bfa83a9e TG |
1203 | |
1204 | if (nla_put(skb, attrtype, 0, NULL) < 0) | |
1205 | return NULL; | |
1206 | ||
1207 | return start; | |
1208 | } | |
1209 | ||
1210 | /** | |
1211 | * nla_nest_end - Finalize nesting of attributes | |
d1ec3b77 | 1212 | * @skb: socket buffer the attributes are stored in |
bfa83a9e TG |
1213 | * @start: container attribute |
1214 | * | |
1215 | * Corrects the container attribute header to include the all | |
1216 | * appeneded attributes. | |
1217 | * | |
1218 | * Returns the total data length of the skb. | |
1219 | */ | |
1220 | static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) | |
1221 | { | |
27a884dc | 1222 | start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
bfa83a9e TG |
1223 | return skb->len; |
1224 | } | |
1225 | ||
1226 | /** | |
1227 | * nla_nest_cancel - Cancel nesting of attributes | |
1228 | * @skb: socket buffer the message is stored in | |
1229 | * @start: container attribute | |
1230 | * | |
1231 | * Removes the container attribute and including all nested | |
bc3ed28c | 1232 | * attributes. Returns -EMSGSIZE |
bfa83a9e | 1233 | */ |
bc3ed28c | 1234 | static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
bfa83a9e | 1235 | { |
bc3ed28c | 1236 | nlmsg_trim(skb, start); |
bfa83a9e TG |
1237 | } |
1238 | ||
4fe5d5c0 PM |
1239 | /** |
1240 | * nla_validate_nested - Validate a stream of nested attributes | |
1241 | * @start: container attribute | |
1242 | * @maxtype: maximum attribute type to be expected | |
1243 | * @policy: validation policy | |
1244 | * | |
1245 | * Validates all attributes in the nested attribute stream against the | |
1246 | * specified policy. Attributes with a type exceeding maxtype will be | |
1247 | * ignored. See documenation of struct nla_policy for more details. | |
1248 | * | |
1249 | * Returns 0 on success or a negative error code. | |
1250 | */ | |
3654654f | 1251 | static inline int nla_validate_nested(const struct nlattr *start, int maxtype, |
ef7c79ed | 1252 | const struct nla_policy *policy) |
4fe5d5c0 PM |
1253 | { |
1254 | return nla_validate(nla_data(start), nla_len(start), maxtype, policy); | |
1255 | } | |
1256 | ||
089bf1a6 ND |
1257 | /** |
1258 | * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute | |
1259 | * @skb: socket buffer the message is stored in | |
1260 | * | |
1261 | * Return true if padding is needed to align the next attribute (nla_data()) to | |
1262 | * a 64-bit aligned area. | |
1263 | */ | |
1264 | static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) | |
1265 | { | |
1266 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
1267 | /* The nlattr header is 4 bytes in size, that's why we test | |
1268 | * if the skb->data _is_ aligned. A NOP attribute, plus | |
1269 | * nlattr header for next attribute, will make nla_data() | |
1270 | * 8-byte aligned. | |
1271 | */ | |
1272 | if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) | |
1273 | return true; | |
1274 | #endif | |
1275 | return false; | |
1276 | } | |
1277 | ||
35c58459 DM |
1278 | /** |
1279 | * nla_align_64bit - 64-bit align the nla_data() of next attribute | |
1280 | * @skb: socket buffer the message is stored in | |
1281 | * @padattr: attribute type for the padding | |
1282 | * | |
1283 | * Conditionally emit a padding netlink attribute in order to make | |
1284 | * the next attribute we emit have a 64-bit aligned nla_data() area. | |
1285 | * This will only be done in architectures which do not have | |
cca1d815 | 1286 | * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. |
35c58459 DM |
1287 | * |
1288 | * Returns zero on success or a negative error code. | |
1289 | */ | |
1290 | static inline int nla_align_64bit(struct sk_buff *skb, int padattr) | |
1291 | { | |
089bf1a6 | 1292 | if (nla_need_padding_for_64bit(skb) && |
cca1d815 ED |
1293 | !nla_reserve(skb, padattr, 0)) |
1294 | return -EMSGSIZE; | |
089bf1a6 | 1295 | |
35c58459 DM |
1296 | return 0; |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * nla_total_size_64bit - total length of attribute including padding | |
1301 | * @payload: length of payload | |
1302 | */ | |
1303 | static inline int nla_total_size_64bit(int payload) | |
1304 | { | |
1305 | return NLA_ALIGN(nla_attr_size(payload)) | |
cca1d815 | 1306 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
35c58459 DM |
1307 | + NLA_ALIGN(nla_attr_size(0)) |
1308 | #endif | |
1309 | ; | |
1310 | } | |
1311 | ||
bfa83a9e TG |
1312 | /** |
1313 | * nla_for_each_attr - iterate over a stream of attributes | |
1314 | * @pos: loop counter, set to current attribute | |
1315 | * @head: head of attribute stream | |
1316 | * @len: length of attribute stream | |
1317 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1318 | */ | |
1319 | #define nla_for_each_attr(pos, head, len, rem) \ | |
1320 | for (pos = head, rem = len; \ | |
1321 | nla_ok(pos, rem); \ | |
1322 | pos = nla_next(pos, &(rem))) | |
1323 | ||
fe4944e5 TG |
1324 | /** |
1325 | * nla_for_each_nested - iterate over nested attributes | |
1326 | * @pos: loop counter, set to current attribute | |
1327 | * @nla: attribute containing the nested attributes | |
1328 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1329 | */ | |
1330 | #define nla_for_each_nested(pos, nla, rem) \ | |
1331 | nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) | |
1332 | ||
941d8ebc SH |
1333 | /** |
1334 | * nla_is_last - Test if attribute is last in stream | |
1335 | * @nla: attribute to test | |
1336 | * @rem: bytes remaining in stream | |
1337 | */ | |
1338 | static inline bool nla_is_last(const struct nlattr *nla, int rem) | |
1339 | { | |
1340 | return nla->nla_len == rem; | |
1341 | } | |
1342 | ||
bfa83a9e | 1343 | #endif |