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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bfa83a9e TG |
2 | /* |
3 | * NETLINK Netlink attributes | |
4 | * | |
5 | * Authors: Thomas Graf <tgraf@suug.ch> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | */ | |
8 | ||
8bc3bcc9 | 9 | #include <linux/export.h> |
bfa83a9e TG |
10 | #include <linux/kernel.h> |
11 | #include <linux/errno.h> | |
12 | #include <linux/jiffies.h> | |
bfa83a9e TG |
13 | #include <linux/skbuff.h> |
14 | #include <linux/string.h> | |
15 | #include <linux/types.h> | |
16 | #include <net/netlink.h> | |
17 | ||
6e237d09 DA |
18 | /* For these data types, attribute length should be exactly the given |
19 | * size. However, to maintain compatibility with broken commands, if the | |
20 | * attribute length does not match the expected size a warning is emitted | |
21 | * to the user that the command is sending invalid data and needs to be fixed. | |
22 | */ | |
28033ae4 | 23 | static const u8 nla_attr_len[NLA_TYPE_MAX+1] = { |
bfa83a9e TG |
24 | [NLA_U8] = sizeof(u8), |
25 | [NLA_U16] = sizeof(u16), | |
26 | [NLA_U32] = sizeof(u32), | |
27 | [NLA_U64] = sizeof(u64), | |
9eca2eb9 JA |
28 | [NLA_S8] = sizeof(s8), |
29 | [NLA_S16] = sizeof(s16), | |
30 | [NLA_S32] = sizeof(s32), | |
31 | [NLA_S64] = sizeof(s64), | |
bfa83a9e TG |
32 | }; |
33 | ||
28033ae4 | 34 | static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = { |
6e237d09 DA |
35 | [NLA_U8] = sizeof(u8), |
36 | [NLA_U16] = sizeof(u16), | |
37 | [NLA_U32] = sizeof(u32), | |
38 | [NLA_U64] = sizeof(u64), | |
28033ae4 DA |
39 | [NLA_MSECS] = sizeof(u64), |
40 | [NLA_NESTED] = NLA_HDRLEN, | |
6e237d09 DA |
41 | [NLA_S8] = sizeof(s8), |
42 | [NLA_S16] = sizeof(s16), | |
43 | [NLA_S32] = sizeof(s32), | |
44 | [NLA_S64] = sizeof(s64), | |
28033ae4 DA |
45 | }; |
46 | ||
7690aa1c JB |
47 | /* |
48 | * Nested policies might refer back to the original | |
49 | * policy in some cases, and userspace could try to | |
50 | * abuse that and recurse by nesting in the right | |
51 | * ways. Limit recursion to avoid this problem. | |
52 | */ | |
53 | #define MAX_POLICY_RECURSION_DEPTH 10 | |
54 | ||
55 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, | |
56 | const struct nla_policy *policy, | |
57 | unsigned int validate, | |
58 | struct netlink_ext_ack *extack, | |
59 | struct nlattr **tb, unsigned int depth); | |
60 | ||
64c83d83 | 61 | static int validate_nla_bitfield32(const struct nlattr *nla, |
47a1494b | 62 | const u32 valid_flags_mask) |
64c83d83 JHS |
63 | { |
64 | const struct nla_bitfield32 *bf = nla_data(nla); | |
64c83d83 | 65 | |
48fde90a | 66 | if (!valid_flags_mask) |
64c83d83 JHS |
67 | return -EINVAL; |
68 | ||
69 | /*disallow invalid bit selector */ | |
47a1494b | 70 | if (bf->selector & ~valid_flags_mask) |
64c83d83 JHS |
71 | return -EINVAL; |
72 | ||
73 | /*disallow invalid bit values */ | |
47a1494b | 74 | if (bf->value & ~valid_flags_mask) |
64c83d83 JHS |
75 | return -EINVAL; |
76 | ||
77 | /*disallow valid bit values that are not selected*/ | |
78 | if (bf->value & ~bf->selector) | |
79 | return -EINVAL; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
1501d135 JB |
84 | static int nla_validate_array(const struct nlattr *head, int len, int maxtype, |
85 | const struct nla_policy *policy, | |
8cb08174 | 86 | struct netlink_ext_ack *extack, |
7690aa1c | 87 | unsigned int validate, unsigned int depth) |
1501d135 JB |
88 | { |
89 | const struct nlattr *entry; | |
90 | int rem; | |
91 | ||
92 | nla_for_each_attr(entry, head, len, rem) { | |
93 | int ret; | |
94 | ||
95 | if (nla_len(entry) == 0) | |
96 | continue; | |
97 | ||
98 | if (nla_len(entry) < NLA_HDRLEN) { | |
44f3625b JB |
99 | NL_SET_ERR_MSG_ATTR_POL(extack, entry, policy, |
100 | "Array element too short"); | |
1501d135 JB |
101 | return -ERANGE; |
102 | } | |
103 | ||
7690aa1c JB |
104 | ret = __nla_validate_parse(nla_data(entry), nla_len(entry), |
105 | maxtype, policy, validate, extack, | |
106 | NULL, depth + 1); | |
1501d135 JB |
107 | if (ret < 0) |
108 | return ret; | |
109 | } | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
2c28ae48 JB |
114 | void nla_get_range_unsigned(const struct nla_policy *pt, |
115 | struct netlink_range_validation *range) | |
3e48be05 | 116 | { |
d06a09b9 JB |
117 | WARN_ON_ONCE(pt->validation_type != NLA_VALIDATE_RANGE_PTR && |
118 | (pt->min < 0 || pt->max < 0)); | |
119 | ||
2c28ae48 JB |
120 | range->min = 0; |
121 | ||
122 | switch (pt->type) { | |
123 | case NLA_U8: | |
124 | range->max = U8_MAX; | |
125 | break; | |
126 | case NLA_U16: | |
8aa26c57 | 127 | case NLA_BINARY: |
2c28ae48 JB |
128 | range->max = U16_MAX; |
129 | break; | |
130 | case NLA_U32: | |
131 | range->max = U32_MAX; | |
132 | break; | |
133 | case NLA_U64: | |
134 | case NLA_MSECS: | |
135 | range->max = U64_MAX; | |
136 | break; | |
137 | default: | |
138 | WARN_ON_ONCE(1); | |
139 | return; | |
140 | } | |
141 | ||
d06a09b9 JB |
142 | switch (pt->validation_type) { |
143 | case NLA_VALIDATE_RANGE: | |
8aa26c57 | 144 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
d06a09b9 JB |
145 | range->min = pt->min; |
146 | range->max = pt->max; | |
147 | break; | |
148 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 149 | *range = *pt->range; |
d06a09b9 JB |
150 | break; |
151 | case NLA_VALIDATE_MIN: | |
152 | range->min = pt->min; | |
153 | break; | |
154 | case NLA_VALIDATE_MAX: | |
155 | range->max = pt->max; | |
156 | break; | |
2c28ae48 JB |
157 | default: |
158 | break; | |
d06a09b9 | 159 | } |
2c28ae48 JB |
160 | } |
161 | ||
8aa26c57 JB |
162 | static int nla_validate_range_unsigned(const struct nla_policy *pt, |
163 | const struct nlattr *nla, | |
164 | struct netlink_ext_ack *extack, | |
165 | unsigned int validate) | |
2c28ae48 JB |
166 | { |
167 | struct netlink_range_validation range; | |
168 | u64 value; | |
3e48be05 JB |
169 | |
170 | switch (pt->type) { | |
171 | case NLA_U8: | |
172 | value = nla_get_u8(nla); | |
173 | break; | |
174 | case NLA_U16: | |
175 | value = nla_get_u16(nla); | |
176 | break; | |
177 | case NLA_U32: | |
178 | value = nla_get_u32(nla); | |
179 | break; | |
d06a09b9 | 180 | case NLA_U64: |
da4063bd | 181 | case NLA_MSECS: |
d06a09b9 JB |
182 | value = nla_get_u64(nla); |
183 | break; | |
8aa26c57 JB |
184 | case NLA_BINARY: |
185 | value = nla_len(nla); | |
186 | break; | |
d06a09b9 JB |
187 | default: |
188 | return -EINVAL; | |
189 | } | |
190 | ||
2c28ae48 JB |
191 | nla_get_range_unsigned(pt, &range); |
192 | ||
8aa26c57 JB |
193 | if (pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG && |
194 | pt->type == NLA_BINARY && value > range.max) { | |
195 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", | |
196 | current->comm, pt->type); | |
197 | if (validate & NL_VALIDATE_STRICT_ATTRS) { | |
44f3625b JB |
198 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
199 | "invalid attribute length"); | |
8aa26c57 JB |
200 | return -EINVAL; |
201 | } | |
202 | ||
203 | /* this assumes min <= max (don't validate against min) */ | |
204 | return 0; | |
205 | } | |
206 | ||
2c28ae48 | 207 | if (value < range.min || value > range.max) { |
8aa26c57 JB |
208 | bool binary = pt->type == NLA_BINARY; |
209 | ||
210 | if (binary) | |
44f3625b JB |
211 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
212 | "binary attribute size out of range"); | |
8aa26c57 | 213 | else |
44f3625b JB |
214 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
215 | "integer out of range"); | |
8aa26c57 | 216 | |
d06a09b9 JB |
217 | return -ERANGE; |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
2c28ae48 JB |
223 | void nla_get_range_signed(const struct nla_policy *pt, |
224 | struct netlink_range_validation_signed *range) | |
d06a09b9 | 225 | { |
2c28ae48 JB |
226 | switch (pt->type) { |
227 | case NLA_S8: | |
228 | range->min = S8_MIN; | |
229 | range->max = S8_MAX; | |
230 | break; | |
231 | case NLA_S16: | |
232 | range->min = S16_MIN; | |
233 | range->max = S16_MAX; | |
234 | break; | |
235 | case NLA_S32: | |
236 | range->min = S32_MIN; | |
237 | range->max = S32_MAX; | |
238 | break; | |
239 | case NLA_S64: | |
240 | range->min = S64_MIN; | |
241 | range->max = S64_MAX; | |
242 | break; | |
243 | default: | |
244 | WARN_ON_ONCE(1); | |
245 | return; | |
246 | } | |
d06a09b9 JB |
247 | |
248 | switch (pt->validation_type) { | |
249 | case NLA_VALIDATE_RANGE: | |
250 | range->min = pt->min; | |
251 | range->max = pt->max; | |
252 | break; | |
253 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 254 | *range = *pt->range_signed; |
d06a09b9 JB |
255 | break; |
256 | case NLA_VALIDATE_MIN: | |
257 | range->min = pt->min; | |
258 | break; | |
259 | case NLA_VALIDATE_MAX: | |
260 | range->max = pt->max; | |
261 | break; | |
2c28ae48 JB |
262 | default: |
263 | break; | |
d06a09b9 | 264 | } |
2c28ae48 JB |
265 | } |
266 | ||
267 | static int nla_validate_int_range_signed(const struct nla_policy *pt, | |
268 | const struct nlattr *nla, | |
269 | struct netlink_ext_ack *extack) | |
270 | { | |
271 | struct netlink_range_validation_signed range; | |
272 | s64 value; | |
d06a09b9 JB |
273 | |
274 | switch (pt->type) { | |
3e48be05 JB |
275 | case NLA_S8: |
276 | value = nla_get_s8(nla); | |
277 | break; | |
278 | case NLA_S16: | |
279 | value = nla_get_s16(nla); | |
280 | break; | |
281 | case NLA_S32: | |
282 | value = nla_get_s32(nla); | |
283 | break; | |
284 | case NLA_S64: | |
285 | value = nla_get_s64(nla); | |
286 | break; | |
3e48be05 | 287 | default: |
3e48be05 JB |
288 | return -EINVAL; |
289 | } | |
290 | ||
2c28ae48 JB |
291 | nla_get_range_signed(pt, &range); |
292 | ||
293 | if (value < range.min || value > range.max) { | |
44f3625b JB |
294 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
295 | "integer out of range"); | |
3e48be05 JB |
296 | return -ERANGE; |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
d06a09b9 JB |
302 | static int nla_validate_int_range(const struct nla_policy *pt, |
303 | const struct nlattr *nla, | |
8aa26c57 JB |
304 | struct netlink_ext_ack *extack, |
305 | unsigned int validate) | |
d06a09b9 JB |
306 | { |
307 | switch (pt->type) { | |
308 | case NLA_U8: | |
309 | case NLA_U16: | |
310 | case NLA_U32: | |
311 | case NLA_U64: | |
da4063bd | 312 | case NLA_MSECS: |
8aa26c57 JB |
313 | case NLA_BINARY: |
314 | return nla_validate_range_unsigned(pt, nla, extack, validate); | |
d06a09b9 JB |
315 | case NLA_S8: |
316 | case NLA_S16: | |
317 | case NLA_S32: | |
318 | case NLA_S64: | |
319 | return nla_validate_int_range_signed(pt, nla, extack); | |
320 | default: | |
321 | WARN_ON(1); | |
322 | return -EINVAL; | |
323 | } | |
324 | } | |
325 | ||
bdbb4e29 JK |
326 | static int nla_validate_mask(const struct nla_policy *pt, |
327 | const struct nlattr *nla, | |
328 | struct netlink_ext_ack *extack) | |
329 | { | |
330 | u64 value; | |
331 | ||
332 | switch (pt->type) { | |
333 | case NLA_U8: | |
334 | value = nla_get_u8(nla); | |
335 | break; | |
336 | case NLA_U16: | |
337 | value = nla_get_u16(nla); | |
338 | break; | |
339 | case NLA_U32: | |
340 | value = nla_get_u32(nla); | |
341 | break; | |
342 | case NLA_U64: | |
343 | value = nla_get_u64(nla); | |
344 | break; | |
345 | default: | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | if (value & ~(u64)pt->mask) { | |
350 | NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set"); | |
351 | return -EINVAL; | |
352 | } | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
3654654f | 357 | static int validate_nla(const struct nlattr *nla, int maxtype, |
8cb08174 | 358 | const struct nla_policy *policy, unsigned int validate, |
7690aa1c | 359 | struct netlink_ext_ack *extack, unsigned int depth) |
bfa83a9e | 360 | { |
56738f46 | 361 | u16 strict_start_type = policy[0].strict_start_type; |
ef7c79ed | 362 | const struct nla_policy *pt; |
8f4c1f9b | 363 | int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla); |
c29f1845 | 364 | int err = -ERANGE; |
bfa83a9e | 365 | |
56738f46 JB |
366 | if (strict_start_type && type >= strict_start_type) |
367 | validate |= NL_VALIDATE_STRICT; | |
368 | ||
8f4c1f9b | 369 | if (type <= 0 || type > maxtype) |
bfa83a9e TG |
370 | return 0; |
371 | ||
8f4c1f9b | 372 | pt = &policy[type]; |
bfa83a9e TG |
373 | |
374 | BUG_ON(pt->type > NLA_TYPE_MAX); | |
375 | ||
8aa26c57 | 376 | if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) { |
6e237d09 DA |
377 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", |
378 | current->comm, type); | |
8cb08174 | 379 | if (validate & NL_VALIDATE_STRICT_ATTRS) { |
44f3625b JB |
380 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
381 | "invalid attribute length"); | |
8cb08174 JB |
382 | return -EINVAL; |
383 | } | |
28033ae4 DA |
384 | } |
385 | ||
b424e432 MK |
386 | if (validate & NL_VALIDATE_NESTED) { |
387 | if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && | |
388 | !(nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
389 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
390 | "NLA_F_NESTED is missing"); | |
b424e432 MK |
391 | return -EINVAL; |
392 | } | |
393 | if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && | |
394 | pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
395 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
396 | "NLA_F_NESTED not expected"); | |
b424e432 MK |
397 | return -EINVAL; |
398 | } | |
399 | } | |
400 | ||
a5531a5d | 401 | switch (pt->type) { |
568b742a | 402 | case NLA_REJECT: |
47a1494b | 403 | if (extack && pt->reject_message) { |
c29f1845 | 404 | NL_SET_BAD_ATTR(extack, nla); |
47a1494b | 405 | extack->_msg = pt->reject_message; |
c29f1845 JB |
406 | return -EINVAL; |
407 | } | |
408 | err = -EINVAL; | |
409 | goto out_err; | |
568b742a | 410 | |
a5531a5d TG |
411 | case NLA_FLAG: |
412 | if (attrlen > 0) | |
c29f1845 | 413 | goto out_err; |
a5531a5d | 414 | break; |
bfa83a9e | 415 | |
64c83d83 JHS |
416 | case NLA_BITFIELD32: |
417 | if (attrlen != sizeof(struct nla_bitfield32)) | |
c29f1845 | 418 | goto out_err; |
64c83d83 | 419 | |
47a1494b | 420 | err = validate_nla_bitfield32(nla, pt->bitfield32_valid); |
c29f1845 JB |
421 | if (err) |
422 | goto out_err; | |
423 | break; | |
64c83d83 | 424 | |
a5531a5d TG |
425 | case NLA_NUL_STRING: |
426 | if (pt->len) | |
427 | minlen = min_t(int, attrlen, pt->len + 1); | |
428 | else | |
429 | minlen = attrlen; | |
bfa83a9e | 430 | |
c29f1845 JB |
431 | if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) { |
432 | err = -EINVAL; | |
433 | goto out_err; | |
434 | } | |
a5531a5d TG |
435 | /* fall through */ |
436 | ||
437 | case NLA_STRING: | |
438 | if (attrlen < 1) | |
c29f1845 | 439 | goto out_err; |
a5531a5d TG |
440 | |
441 | if (pt->len) { | |
442 | char *buf = nla_data(nla); | |
443 | ||
444 | if (buf[attrlen - 1] == '\0') | |
445 | attrlen--; | |
446 | ||
447 | if (attrlen > pt->len) | |
c29f1845 | 448 | goto out_err; |
a5531a5d TG |
449 | } |
450 | break; | |
451 | ||
d30045a0 JB |
452 | case NLA_BINARY: |
453 | if (pt->len && attrlen > pt->len) | |
c29f1845 | 454 | goto out_err; |
d30045a0 JB |
455 | break; |
456 | ||
ea5693cc PM |
457 | case NLA_NESTED: |
458 | /* a nested attributes is allowed to be empty; if its not, | |
459 | * it must have a size of at least NLA_HDRLEN. | |
460 | */ | |
461 | if (attrlen == 0) | |
462 | break; | |
9a659a35 JB |
463 | if (attrlen < NLA_HDRLEN) |
464 | goto out_err; | |
47a1494b | 465 | if (pt->nested_policy) { |
7690aa1c JB |
466 | err = __nla_validate_parse(nla_data(nla), nla_len(nla), |
467 | pt->len, pt->nested_policy, | |
468 | validate, extack, NULL, | |
469 | depth + 1); | |
9a659a35 JB |
470 | if (err < 0) { |
471 | /* | |
472 | * return directly to preserve the inner | |
473 | * error message/attribute pointer | |
474 | */ | |
475 | return err; | |
476 | } | |
477 | } | |
478 | break; | |
1501d135 JB |
479 | case NLA_NESTED_ARRAY: |
480 | /* a nested array attribute is allowed to be empty; if its not, | |
481 | * it must have a size of at least NLA_HDRLEN. | |
482 | */ | |
483 | if (attrlen == 0) | |
484 | break; | |
485 | if (attrlen < NLA_HDRLEN) | |
486 | goto out_err; | |
47a1494b | 487 | if (pt->nested_policy) { |
1501d135 JB |
488 | int err; |
489 | ||
490 | err = nla_validate_array(nla_data(nla), nla_len(nla), | |
47a1494b | 491 | pt->len, pt->nested_policy, |
7690aa1c | 492 | extack, validate, depth); |
1501d135 JB |
493 | if (err < 0) { |
494 | /* | |
495 | * return directly to preserve the inner | |
496 | * error message/attribute pointer | |
497 | */ | |
498 | return err; | |
499 | } | |
500 | } | |
501 | break; | |
6f455f5f JB |
502 | |
503 | case NLA_UNSPEC: | |
8cb08174 JB |
504 | if (validate & NL_VALIDATE_UNSPEC) { |
505 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
506 | "Unsupported attribute"); | |
507 | return -EINVAL; | |
508 | } | |
6f455f5f JB |
509 | if (attrlen < pt->len) |
510 | goto out_err; | |
511 | break; | |
512 | ||
a5531a5d TG |
513 | default: |
514 | if (pt->len) | |
515 | minlen = pt->len; | |
6f455f5f | 516 | else |
a5531a5d TG |
517 | minlen = nla_attr_minlen[pt->type]; |
518 | ||
519 | if (attrlen < minlen) | |
c29f1845 | 520 | goto out_err; |
a5531a5d | 521 | } |
bfa83a9e | 522 | |
3e48be05 JB |
523 | /* further validation */ |
524 | switch (pt->validation_type) { | |
525 | case NLA_VALIDATE_NONE: | |
526 | /* nothing to do */ | |
527 | break; | |
d06a09b9 | 528 | case NLA_VALIDATE_RANGE_PTR: |
3e48be05 | 529 | case NLA_VALIDATE_RANGE: |
8aa26c57 | 530 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
3e48be05 JB |
531 | case NLA_VALIDATE_MIN: |
532 | case NLA_VALIDATE_MAX: | |
8aa26c57 | 533 | err = nla_validate_int_range(pt, nla, extack, validate); |
3e48be05 JB |
534 | if (err) |
535 | return err; | |
536 | break; | |
bdbb4e29 JK |
537 | case NLA_VALIDATE_MASK: |
538 | err = nla_validate_mask(pt, nla, extack); | |
539 | if (err) | |
540 | return err; | |
541 | break; | |
33188bd6 JB |
542 | case NLA_VALIDATE_FUNCTION: |
543 | if (pt->validate) { | |
544 | err = pt->validate(nla, extack); | |
545 | if (err) | |
546 | return err; | |
547 | } | |
548 | break; | |
3e48be05 JB |
549 | } |
550 | ||
bfa83a9e | 551 | return 0; |
c29f1845 | 552 | out_err: |
44f3625b JB |
553 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
554 | "Attribute failed policy validation"); | |
c29f1845 | 555 | return err; |
bfa83a9e TG |
556 | } |
557 | ||
8cb08174 JB |
558 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, |
559 | const struct nla_policy *policy, | |
560 | unsigned int validate, | |
561 | struct netlink_ext_ack *extack, | |
7690aa1c | 562 | struct nlattr **tb, unsigned int depth) |
8cb08174 JB |
563 | { |
564 | const struct nlattr *nla; | |
565 | int rem; | |
566 | ||
7690aa1c JB |
567 | if (depth >= MAX_POLICY_RECURSION_DEPTH) { |
568 | NL_SET_ERR_MSG(extack, | |
569 | "allowed policy recursion depth exceeded"); | |
570 | return -EINVAL; | |
571 | } | |
572 | ||
8cb08174 JB |
573 | if (tb) |
574 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
575 | ||
576 | nla_for_each_attr(nla, head, len, rem) { | |
577 | u16 type = nla_type(nla); | |
578 | ||
579 | if (type == 0 || type > maxtype) { | |
580 | if (validate & NL_VALIDATE_MAXTYPE) { | |
d54a16b2 MK |
581 | NL_SET_ERR_MSG_ATTR(extack, nla, |
582 | "Unknown attribute type"); | |
8cb08174 JB |
583 | return -EINVAL; |
584 | } | |
585 | continue; | |
586 | } | |
587 | if (policy) { | |
588 | int err = validate_nla(nla, maxtype, policy, | |
7690aa1c | 589 | validate, extack, depth); |
8cb08174 JB |
590 | |
591 | if (err < 0) | |
592 | return err; | |
593 | } | |
594 | ||
595 | if (tb) | |
596 | tb[type] = (struct nlattr *)nla; | |
597 | } | |
598 | ||
599 | if (unlikely(rem > 0)) { | |
600 | pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n", | |
601 | rem, current->comm); | |
602 | NL_SET_ERR_MSG(extack, "bytes leftover after parsing attributes"); | |
603 | if (validate & NL_VALIDATE_TRAILING) | |
604 | return -EINVAL; | |
605 | } | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
bfa83a9e | 610 | /** |
8cb08174 | 611 | * __nla_validate - Validate a stream of attributes |
bfa83a9e TG |
612 | * @head: head of attribute stream |
613 | * @len: length of attribute stream | |
614 | * @maxtype: maximum attribute type to be expected | |
615 | * @policy: validation policy | |
8cb08174 | 616 | * @validate: validation strictness |
fceb6435 | 617 | * @extack: extended ACK report struct |
bfa83a9e TG |
618 | * |
619 | * Validates all attributes in the specified attribute stream against the | |
8cb08174 JB |
620 | * specified policy. Validation depends on the validate flags passed, see |
621 | * &enum netlink_validation for more details on that. | |
622 | * See documenation of struct nla_policy for more details. | |
bfa83a9e TG |
623 | * |
624 | * Returns 0 on success or a negative error code. | |
625 | */ | |
8cb08174 JB |
626 | int __nla_validate(const struct nlattr *head, int len, int maxtype, |
627 | const struct nla_policy *policy, unsigned int validate, | |
628 | struct netlink_ext_ack *extack) | |
bfa83a9e | 629 | { |
8cb08174 | 630 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 631 | extack, NULL, 0); |
bfa83a9e | 632 | } |
8cb08174 | 633 | EXPORT_SYMBOL(__nla_validate); |
bfa83a9e | 634 | |
e487eb99 HE |
635 | /** |
636 | * nla_policy_len - Determin the max. length of a policy | |
637 | * @policy: policy to use | |
638 | * @n: number of policies | |
639 | * | |
640 | * Determines the max. length of the policy. It is currently used | |
641 | * to allocated Netlink buffers roughly the size of the actual | |
642 | * message. | |
643 | * | |
644 | * Returns 0 on success or a negative error code. | |
645 | */ | |
646 | int | |
647 | nla_policy_len(const struct nla_policy *p, int n) | |
648 | { | |
649 | int i, len = 0; | |
650 | ||
e3fa3aff | 651 | for (i = 0; i < n; i++, p++) { |
e487eb99 HE |
652 | if (p->len) |
653 | len += nla_total_size(p->len); | |
28033ae4 DA |
654 | else if (nla_attr_len[p->type]) |
655 | len += nla_total_size(nla_attr_len[p->type]); | |
e487eb99 HE |
656 | else if (nla_attr_minlen[p->type]) |
657 | len += nla_total_size(nla_attr_minlen[p->type]); | |
658 | } | |
659 | ||
660 | return len; | |
661 | } | |
6d6a138f | 662 | EXPORT_SYMBOL(nla_policy_len); |
e487eb99 | 663 | |
bfa83a9e | 664 | /** |
8cb08174 | 665 | * __nla_parse - Parse a stream of attributes into a tb buffer |
bfa83a9e TG |
666 | * @tb: destination array with maxtype+1 elements |
667 | * @maxtype: maximum attribute type to be expected | |
668 | * @head: head of attribute stream | |
669 | * @len: length of attribute stream | |
10b595af | 670 | * @policy: validation policy |
8cb08174 JB |
671 | * @validate: validation strictness |
672 | * @extack: extended ACK pointer | |
bfa83a9e TG |
673 | * |
674 | * Parses a stream of attributes and stores a pointer to each attribute in | |
8cb08174 JB |
675 | * the tb array accessible via the attribute type. |
676 | * Validation is controlled by the @validate parameter. | |
bfa83a9e TG |
677 | * |
678 | * Returns 0 on success or a negative error code. | |
679 | */ | |
8cb08174 JB |
680 | int __nla_parse(struct nlattr **tb, int maxtype, |
681 | const struct nlattr *head, int len, | |
682 | const struct nla_policy *policy, unsigned int validate, | |
683 | struct netlink_ext_ack *extack) | |
a5f6cba2 | 684 | { |
8cb08174 | 685 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 686 | extack, tb, 0); |
a5f6cba2 | 687 | } |
8cb08174 | 688 | EXPORT_SYMBOL(__nla_parse); |
a5f6cba2 | 689 | |
bfa83a9e TG |
690 | /** |
691 | * nla_find - Find a specific attribute in a stream of attributes | |
692 | * @head: head of attribute stream | |
693 | * @len: length of attribute stream | |
694 | * @attrtype: type of attribute to look for | |
695 | * | |
696 | * Returns the first attribute in the stream matching the specified type. | |
697 | */ | |
3654654f | 698 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype) |
bfa83a9e | 699 | { |
3654654f | 700 | const struct nlattr *nla; |
bfa83a9e TG |
701 | int rem; |
702 | ||
703 | nla_for_each_attr(nla, head, len, rem) | |
8f4c1f9b | 704 | if (nla_type(nla) == attrtype) |
3654654f | 705 | return (struct nlattr *)nla; |
bfa83a9e TG |
706 | |
707 | return NULL; | |
708 | } | |
6d6a138f | 709 | EXPORT_SYMBOL(nla_find); |
bfa83a9e TG |
710 | |
711 | /** | |
712 | * nla_strlcpy - Copy string attribute payload into a sized buffer | |
713 | * @dst: where to copy the string to | |
10b595af | 714 | * @nla: attribute to copy the string from |
bfa83a9e TG |
715 | * @dstsize: size of destination buffer |
716 | * | |
717 | * Copies at most dstsize - 1 bytes into the destination buffer. | |
718 | * The result is always a valid NUL-terminated string. Unlike | |
719 | * strlcpy the destination buffer is always padded out. | |
720 | * | |
721 | * Returns the length of the source buffer. | |
722 | */ | |
723 | size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize) | |
724 | { | |
725 | size_t srclen = nla_len(nla); | |
726 | char *src = nla_data(nla); | |
727 | ||
728 | if (srclen > 0 && src[srclen - 1] == '\0') | |
729 | srclen--; | |
730 | ||
731 | if (dstsize > 0) { | |
732 | size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen; | |
733 | ||
734 | memset(dst, 0, dstsize); | |
735 | memcpy(dst, src, len); | |
736 | } | |
737 | ||
738 | return srclen; | |
739 | } | |
6d6a138f | 740 | EXPORT_SYMBOL(nla_strlcpy); |
bfa83a9e | 741 | |
2cf0c8b3 PS |
742 | /** |
743 | * nla_strdup - Copy string attribute payload into a newly allocated buffer | |
744 | * @nla: attribute to copy the string from | |
745 | * @flags: the type of memory to allocate (see kmalloc). | |
746 | * | |
747 | * Returns a pointer to the allocated buffer or NULL on error. | |
748 | */ | |
749 | char *nla_strdup(const struct nlattr *nla, gfp_t flags) | |
750 | { | |
751 | size_t srclen = nla_len(nla); | |
752 | char *src = nla_data(nla), *dst; | |
753 | ||
754 | if (srclen > 0 && src[srclen - 1] == '\0') | |
755 | srclen--; | |
756 | ||
757 | dst = kmalloc(srclen + 1, flags); | |
758 | if (dst != NULL) { | |
759 | memcpy(dst, src, srclen); | |
760 | dst[srclen] = '\0'; | |
761 | } | |
762 | return dst; | |
763 | } | |
764 | EXPORT_SYMBOL(nla_strdup); | |
765 | ||
bfa83a9e TG |
766 | /** |
767 | * nla_memcpy - Copy a netlink attribute into another memory area | |
768 | * @dest: where to copy to memcpy | |
769 | * @src: netlink attribute to copy from | |
770 | * @count: size of the destination area | |
771 | * | |
772 | * Note: The number of bytes copied is limited by the length of | |
773 | * attribute's payload. memcpy | |
774 | * | |
775 | * Returns the number of bytes copied. | |
776 | */ | |
b057efd4 | 777 | int nla_memcpy(void *dest, const struct nlattr *src, int count) |
bfa83a9e TG |
778 | { |
779 | int minlen = min_t(int, count, nla_len(src)); | |
780 | ||
781 | memcpy(dest, nla_data(src), minlen); | |
5899f047 JB |
782 | if (count > minlen) |
783 | memset(dest + minlen, 0, count - minlen); | |
bfa83a9e TG |
784 | |
785 | return minlen; | |
786 | } | |
6d6a138f | 787 | EXPORT_SYMBOL(nla_memcpy); |
bfa83a9e TG |
788 | |
789 | /** | |
790 | * nla_memcmp - Compare an attribute with sized memory area | |
791 | * @nla: netlink attribute | |
792 | * @data: memory area | |
793 | * @size: size of memory area | |
794 | */ | |
795 | int nla_memcmp(const struct nlattr *nla, const void *data, | |
796 | size_t size) | |
797 | { | |
798 | int d = nla_len(nla) - size; | |
799 | ||
800 | if (d == 0) | |
801 | d = memcmp(nla_data(nla), data, size); | |
802 | ||
803 | return d; | |
804 | } | |
6d6a138f | 805 | EXPORT_SYMBOL(nla_memcmp); |
bfa83a9e TG |
806 | |
807 | /** | |
808 | * nla_strcmp - Compare a string attribute against a string | |
809 | * @nla: netlink string attribute | |
810 | * @str: another string | |
811 | */ | |
812 | int nla_strcmp(const struct nlattr *nla, const char *str) | |
813 | { | |
8b7b9324 PN |
814 | int len = strlen(str); |
815 | char *buf = nla_data(nla); | |
816 | int attrlen = nla_len(nla); | |
817 | int d; | |
bfa83a9e | 818 | |
8b7b9324 PN |
819 | if (attrlen > 0 && buf[attrlen - 1] == '\0') |
820 | attrlen--; | |
821 | ||
822 | d = attrlen - len; | |
bfa83a9e TG |
823 | if (d == 0) |
824 | d = memcmp(nla_data(nla), str, len); | |
825 | ||
826 | return d; | |
827 | } | |
6d6a138f | 828 | EXPORT_SYMBOL(nla_strcmp); |
bfa83a9e | 829 | |
90800216 | 830 | #ifdef CONFIG_NET |
bfa83a9e TG |
831 | /** |
832 | * __nla_reserve - reserve room for attribute on the skb | |
833 | * @skb: socket buffer to reserve room on | |
834 | * @attrtype: attribute type | |
835 | * @attrlen: length of attribute payload | |
836 | * | |
837 | * Adds a netlink attribute header to a socket buffer and reserves | |
838 | * room for the payload but does not copy it. | |
839 | * | |
840 | * The caller is responsible to ensure that the skb provides enough | |
841 | * tailroom for the attribute header and payload. | |
842 | */ | |
843 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
844 | { | |
845 | struct nlattr *nla; | |
846 | ||
4df864c1 | 847 | nla = skb_put(skb, nla_total_size(attrlen)); |
bfa83a9e TG |
848 | nla->nla_type = attrtype; |
849 | nla->nla_len = nla_attr_size(attrlen); | |
850 | ||
851 | memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); | |
852 | ||
853 | return nla; | |
854 | } | |
90800216 | 855 | EXPORT_SYMBOL(__nla_reserve); |
bfa83a9e | 856 | |
089bf1a6 ND |
857 | /** |
858 | * __nla_reserve_64bit - reserve room for attribute on the skb and align it | |
859 | * @skb: socket buffer to reserve room on | |
860 | * @attrtype: attribute type | |
861 | * @attrlen: length of attribute payload | |
11a99573 | 862 | * @padattr: attribute type for the padding |
089bf1a6 ND |
863 | * |
864 | * Adds a netlink attribute header to a socket buffer and reserves | |
865 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 866 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
867 | * |
868 | * The caller is responsible to ensure that the skb provides enough | |
869 | * tailroom for the attribute header and payload. | |
870 | */ | |
871 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, | |
872 | int attrlen, int padattr) | |
873 | { | |
4718a471 | 874 | nla_align_64bit(skb, padattr); |
089bf1a6 ND |
875 | |
876 | return __nla_reserve(skb, attrtype, attrlen); | |
877 | } | |
878 | EXPORT_SYMBOL(__nla_reserve_64bit); | |
879 | ||
fe4944e5 TG |
880 | /** |
881 | * __nla_reserve_nohdr - reserve room for attribute without header | |
882 | * @skb: socket buffer to reserve room on | |
883 | * @attrlen: length of attribute payload | |
884 | * | |
885 | * Reserves room for attribute payload without a header. | |
886 | * | |
887 | * The caller is responsible to ensure that the skb provides enough | |
888 | * tailroom for the payload. | |
889 | */ | |
890 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
891 | { | |
b952f4df | 892 | return skb_put_zero(skb, NLA_ALIGN(attrlen)); |
fe4944e5 | 893 | } |
90800216 | 894 | EXPORT_SYMBOL(__nla_reserve_nohdr); |
fe4944e5 | 895 | |
bfa83a9e TG |
896 | /** |
897 | * nla_reserve - reserve room for attribute on the skb | |
898 | * @skb: socket buffer to reserve room on | |
899 | * @attrtype: attribute type | |
900 | * @attrlen: length of attribute payload | |
901 | * | |
902 | * Adds a netlink attribute header to a socket buffer and reserves | |
903 | * room for the payload but does not copy it. | |
904 | * | |
905 | * Returns NULL if the tailroom of the skb is insufficient to store | |
906 | * the attribute header and payload. | |
907 | */ | |
908 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
909 | { | |
910 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
911 | return NULL; | |
912 | ||
913 | return __nla_reserve(skb, attrtype, attrlen); | |
914 | } | |
90800216 | 915 | EXPORT_SYMBOL(nla_reserve); |
bfa83a9e | 916 | |
089bf1a6 ND |
917 | /** |
918 | * nla_reserve_64bit - reserve room for attribute on the skb and align it | |
919 | * @skb: socket buffer to reserve room on | |
920 | * @attrtype: attribute type | |
921 | * @attrlen: length of attribute payload | |
11a99573 | 922 | * @padattr: attribute type for the padding |
089bf1a6 ND |
923 | * |
924 | * Adds a netlink attribute header to a socket buffer and reserves | |
925 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 926 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
927 | * |
928 | * Returns NULL if the tailroom of the skb is insufficient to store | |
929 | * the attribute header and payload. | |
930 | */ | |
931 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
932 | int padattr) | |
933 | { | |
934 | size_t len; | |
935 | ||
936 | if (nla_need_padding_for_64bit(skb)) | |
937 | len = nla_total_size_64bit(attrlen); | |
938 | else | |
939 | len = nla_total_size(attrlen); | |
940 | if (unlikely(skb_tailroom(skb) < len)) | |
941 | return NULL; | |
942 | ||
943 | return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
944 | } | |
945 | EXPORT_SYMBOL(nla_reserve_64bit); | |
946 | ||
fe4944e5 | 947 | /** |
10b595af | 948 | * nla_reserve_nohdr - reserve room for attribute without header |
fe4944e5 | 949 | * @skb: socket buffer to reserve room on |
10b595af | 950 | * @attrlen: length of attribute payload |
fe4944e5 TG |
951 | * |
952 | * Reserves room for attribute payload without a header. | |
953 | * | |
954 | * Returns NULL if the tailroom of the skb is insufficient to store | |
955 | * the attribute payload. | |
956 | */ | |
957 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
958 | { | |
959 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
960 | return NULL; | |
961 | ||
962 | return __nla_reserve_nohdr(skb, attrlen); | |
963 | } | |
90800216 | 964 | EXPORT_SYMBOL(nla_reserve_nohdr); |
fe4944e5 | 965 | |
bfa83a9e TG |
966 | /** |
967 | * __nla_put - Add a netlink attribute to a socket buffer | |
968 | * @skb: socket buffer to add attribute to | |
969 | * @attrtype: attribute type | |
970 | * @attrlen: length of attribute payload | |
971 | * @data: head of attribute payload | |
972 | * | |
973 | * The caller is responsible to ensure that the skb provides enough | |
974 | * tailroom for the attribute header and payload. | |
975 | */ | |
976 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
977 | const void *data) | |
978 | { | |
979 | struct nlattr *nla; | |
980 | ||
981 | nla = __nla_reserve(skb, attrtype, attrlen); | |
982 | memcpy(nla_data(nla), data, attrlen); | |
983 | } | |
90800216 | 984 | EXPORT_SYMBOL(__nla_put); |
bfa83a9e | 985 | |
089bf1a6 ND |
986 | /** |
987 | * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
988 | * @skb: socket buffer to add attribute to | |
989 | * @attrtype: attribute type | |
990 | * @attrlen: length of attribute payload | |
991 | * @data: head of attribute payload | |
11a99573 | 992 | * @padattr: attribute type for the padding |
089bf1a6 ND |
993 | * |
994 | * The caller is responsible to ensure that the skb provides enough | |
995 | * tailroom for the attribute header and payload. | |
996 | */ | |
997 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
998 | const void *data, int padattr) | |
999 | { | |
1000 | struct nlattr *nla; | |
1001 | ||
1002 | nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
1003 | memcpy(nla_data(nla), data, attrlen); | |
1004 | } | |
1005 | EXPORT_SYMBOL(__nla_put_64bit); | |
1006 | ||
fe4944e5 TG |
1007 | /** |
1008 | * __nla_put_nohdr - Add a netlink attribute without header | |
1009 | * @skb: socket buffer to add attribute to | |
1010 | * @attrlen: length of attribute payload | |
1011 | * @data: head of attribute payload | |
1012 | * | |
1013 | * The caller is responsible to ensure that the skb provides enough | |
1014 | * tailroom for the attribute payload. | |
1015 | */ | |
1016 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1017 | { | |
1018 | void *start; | |
1019 | ||
1020 | start = __nla_reserve_nohdr(skb, attrlen); | |
1021 | memcpy(start, data, attrlen); | |
1022 | } | |
90800216 | 1023 | EXPORT_SYMBOL(__nla_put_nohdr); |
bfa83a9e TG |
1024 | |
1025 | /** | |
1026 | * nla_put - Add a netlink attribute to a socket buffer | |
1027 | * @skb: socket buffer to add attribute to | |
1028 | * @attrtype: attribute type | |
1029 | * @attrlen: length of attribute payload | |
1030 | * @data: head of attribute payload | |
1031 | * | |
bc3ed28c | 1032 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
bfa83a9e TG |
1033 | * the attribute header and payload. |
1034 | */ | |
1035 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
1036 | { | |
1037 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
bc3ed28c | 1038 | return -EMSGSIZE; |
bfa83a9e TG |
1039 | |
1040 | __nla_put(skb, attrtype, attrlen, data); | |
1041 | return 0; | |
1042 | } | |
90800216 | 1043 | EXPORT_SYMBOL(nla_put); |
bfa83a9e | 1044 | |
089bf1a6 ND |
1045 | /** |
1046 | * nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
1047 | * @skb: socket buffer to add attribute to | |
1048 | * @attrtype: attribute type | |
1049 | * @attrlen: length of attribute payload | |
1050 | * @data: head of attribute payload | |
11a99573 | 1051 | * @padattr: attribute type for the padding |
089bf1a6 ND |
1052 | * |
1053 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store | |
1054 | * the attribute header and payload. | |
1055 | */ | |
1056 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
1057 | const void *data, int padattr) | |
1058 | { | |
1059 | size_t len; | |
1060 | ||
1061 | if (nla_need_padding_for_64bit(skb)) | |
1062 | len = nla_total_size_64bit(attrlen); | |
1063 | else | |
1064 | len = nla_total_size(attrlen); | |
1065 | if (unlikely(skb_tailroom(skb) < len)) | |
1066 | return -EMSGSIZE; | |
1067 | ||
1068 | __nla_put_64bit(skb, attrtype, attrlen, data, padattr); | |
1069 | return 0; | |
1070 | } | |
1071 | EXPORT_SYMBOL(nla_put_64bit); | |
1072 | ||
fe4944e5 TG |
1073 | /** |
1074 | * nla_put_nohdr - Add a netlink attribute without header | |
1075 | * @skb: socket buffer to add attribute to | |
1076 | * @attrlen: length of attribute payload | |
1077 | * @data: head of attribute payload | |
1078 | * | |
bc3ed28c | 1079 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
fe4944e5 TG |
1080 | * the attribute payload. |
1081 | */ | |
1082 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1083 | { | |
1084 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1085 | return -EMSGSIZE; |
fe4944e5 TG |
1086 | |
1087 | __nla_put_nohdr(skb, attrlen, data); | |
1088 | return 0; | |
1089 | } | |
90800216 | 1090 | EXPORT_SYMBOL(nla_put_nohdr); |
bfa83a9e | 1091 | |
01480e1c PM |
1092 | /** |
1093 | * nla_append - Add a netlink attribute without header or padding | |
1094 | * @skb: socket buffer to add attribute to | |
1095 | * @attrlen: length of attribute payload | |
1096 | * @data: head of attribute payload | |
1097 | * | |
bc3ed28c | 1098 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
01480e1c PM |
1099 | * the attribute payload. |
1100 | */ | |
1101 | int nla_append(struct sk_buff *skb, int attrlen, const void *data) | |
1102 | { | |
1103 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1104 | return -EMSGSIZE; |
01480e1c | 1105 | |
59ae1d12 | 1106 | skb_put_data(skb, data, attrlen); |
01480e1c PM |
1107 | return 0; |
1108 | } | |
90800216 HX |
1109 | EXPORT_SYMBOL(nla_append); |
1110 | #endif |