Commit | Line | Data |
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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: | |
ecaf75ff | 127 | case NLA_BE16: |
8aa26c57 | 128 | case NLA_BINARY: |
2c28ae48 JB |
129 | range->max = U16_MAX; |
130 | break; | |
131 | case NLA_U32: | |
ecaf75ff | 132 | case NLA_BE32: |
2c28ae48 JB |
133 | range->max = U32_MAX; |
134 | break; | |
135 | case NLA_U64: | |
136 | case NLA_MSECS: | |
137 | range->max = U64_MAX; | |
138 | break; | |
139 | default: | |
140 | WARN_ON_ONCE(1); | |
141 | return; | |
142 | } | |
143 | ||
d06a09b9 JB |
144 | switch (pt->validation_type) { |
145 | case NLA_VALIDATE_RANGE: | |
8aa26c57 | 146 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
d06a09b9 JB |
147 | range->min = pt->min; |
148 | range->max = pt->max; | |
149 | break; | |
150 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 151 | *range = *pt->range; |
d06a09b9 JB |
152 | break; |
153 | case NLA_VALIDATE_MIN: | |
154 | range->min = pt->min; | |
155 | break; | |
156 | case NLA_VALIDATE_MAX: | |
157 | range->max = pt->max; | |
158 | break; | |
2c28ae48 JB |
159 | default: |
160 | break; | |
d06a09b9 | 161 | } |
2c28ae48 JB |
162 | } |
163 | ||
8aa26c57 JB |
164 | static int nla_validate_range_unsigned(const struct nla_policy *pt, |
165 | const struct nlattr *nla, | |
166 | struct netlink_ext_ack *extack, | |
167 | unsigned int validate) | |
2c28ae48 JB |
168 | { |
169 | struct netlink_range_validation range; | |
170 | u64 value; | |
3e48be05 JB |
171 | |
172 | switch (pt->type) { | |
173 | case NLA_U8: | |
174 | value = nla_get_u8(nla); | |
175 | break; | |
176 | case NLA_U16: | |
ecaf75ff FW |
177 | value = nla_get_u16(nla); |
178 | break; | |
3e48be05 | 179 | case NLA_U32: |
ecaf75ff FW |
180 | value = nla_get_u32(nla); |
181 | break; | |
d06a09b9 | 182 | case NLA_U64: |
ecaf75ff | 183 | value = nla_get_u64(nla); |
08724ef6 | 184 | break; |
da4063bd | 185 | case NLA_MSECS: |
d06a09b9 JB |
186 | value = nla_get_u64(nla); |
187 | break; | |
8aa26c57 JB |
188 | case NLA_BINARY: |
189 | value = nla_len(nla); | |
190 | break; | |
ecaf75ff FW |
191 | case NLA_BE16: |
192 | value = ntohs(nla_get_be16(nla)); | |
193 | break; | |
194 | case NLA_BE32: | |
195 | value = ntohl(nla_get_be32(nla)); | |
196 | break; | |
d06a09b9 JB |
197 | default: |
198 | return -EINVAL; | |
199 | } | |
200 | ||
2c28ae48 JB |
201 | nla_get_range_unsigned(pt, &range); |
202 | ||
8aa26c57 JB |
203 | if (pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG && |
204 | pt->type == NLA_BINARY && value > range.max) { | |
205 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", | |
206 | current->comm, pt->type); | |
207 | if (validate & NL_VALIDATE_STRICT_ATTRS) { | |
44f3625b JB |
208 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
209 | "invalid attribute length"); | |
8aa26c57 JB |
210 | return -EINVAL; |
211 | } | |
212 | ||
213 | /* this assumes min <= max (don't validate against min) */ | |
214 | return 0; | |
215 | } | |
216 | ||
2c28ae48 | 217 | if (value < range.min || value > range.max) { |
8aa26c57 JB |
218 | bool binary = pt->type == NLA_BINARY; |
219 | ||
220 | if (binary) | |
44f3625b JB |
221 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
222 | "binary attribute size out of range"); | |
8aa26c57 | 223 | else |
44f3625b JB |
224 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
225 | "integer out of range"); | |
8aa26c57 | 226 | |
d06a09b9 JB |
227 | return -ERANGE; |
228 | } | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
2c28ae48 JB |
233 | void nla_get_range_signed(const struct nla_policy *pt, |
234 | struct netlink_range_validation_signed *range) | |
d06a09b9 | 235 | { |
2c28ae48 JB |
236 | switch (pt->type) { |
237 | case NLA_S8: | |
238 | range->min = S8_MIN; | |
239 | range->max = S8_MAX; | |
240 | break; | |
241 | case NLA_S16: | |
242 | range->min = S16_MIN; | |
243 | range->max = S16_MAX; | |
244 | break; | |
245 | case NLA_S32: | |
246 | range->min = S32_MIN; | |
247 | range->max = S32_MAX; | |
248 | break; | |
249 | case NLA_S64: | |
250 | range->min = S64_MIN; | |
251 | range->max = S64_MAX; | |
252 | break; | |
253 | default: | |
254 | WARN_ON_ONCE(1); | |
255 | return; | |
256 | } | |
d06a09b9 JB |
257 | |
258 | switch (pt->validation_type) { | |
259 | case NLA_VALIDATE_RANGE: | |
260 | range->min = pt->min; | |
261 | range->max = pt->max; | |
262 | break; | |
263 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 264 | *range = *pt->range_signed; |
d06a09b9 JB |
265 | break; |
266 | case NLA_VALIDATE_MIN: | |
267 | range->min = pt->min; | |
268 | break; | |
269 | case NLA_VALIDATE_MAX: | |
270 | range->max = pt->max; | |
271 | break; | |
2c28ae48 JB |
272 | default: |
273 | break; | |
d06a09b9 | 274 | } |
2c28ae48 JB |
275 | } |
276 | ||
277 | static int nla_validate_int_range_signed(const struct nla_policy *pt, | |
278 | const struct nlattr *nla, | |
279 | struct netlink_ext_ack *extack) | |
280 | { | |
281 | struct netlink_range_validation_signed range; | |
282 | s64 value; | |
d06a09b9 JB |
283 | |
284 | switch (pt->type) { | |
3e48be05 JB |
285 | case NLA_S8: |
286 | value = nla_get_s8(nla); | |
287 | break; | |
288 | case NLA_S16: | |
289 | value = nla_get_s16(nla); | |
290 | break; | |
291 | case NLA_S32: | |
292 | value = nla_get_s32(nla); | |
293 | break; | |
294 | case NLA_S64: | |
295 | value = nla_get_s64(nla); | |
296 | break; | |
3e48be05 | 297 | default: |
3e48be05 JB |
298 | return -EINVAL; |
299 | } | |
300 | ||
2c28ae48 JB |
301 | nla_get_range_signed(pt, &range); |
302 | ||
303 | if (value < range.min || value > range.max) { | |
44f3625b JB |
304 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
305 | "integer out of range"); | |
3e48be05 JB |
306 | return -ERANGE; |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
d06a09b9 JB |
312 | static int nla_validate_int_range(const struct nla_policy *pt, |
313 | const struct nlattr *nla, | |
8aa26c57 JB |
314 | struct netlink_ext_ack *extack, |
315 | unsigned int validate) | |
d06a09b9 JB |
316 | { |
317 | switch (pt->type) { | |
318 | case NLA_U8: | |
319 | case NLA_U16: | |
320 | case NLA_U32: | |
321 | case NLA_U64: | |
da4063bd | 322 | case NLA_MSECS: |
8aa26c57 | 323 | case NLA_BINARY: |
ecaf75ff FW |
324 | case NLA_BE16: |
325 | case NLA_BE32: | |
8aa26c57 | 326 | return nla_validate_range_unsigned(pt, nla, extack, validate); |
d06a09b9 JB |
327 | case NLA_S8: |
328 | case NLA_S16: | |
329 | case NLA_S32: | |
330 | case NLA_S64: | |
331 | return nla_validate_int_range_signed(pt, nla, extack); | |
332 | default: | |
333 | WARN_ON(1); | |
334 | return -EINVAL; | |
335 | } | |
336 | } | |
337 | ||
bdbb4e29 JK |
338 | static int nla_validate_mask(const struct nla_policy *pt, |
339 | const struct nlattr *nla, | |
340 | struct netlink_ext_ack *extack) | |
341 | { | |
342 | u64 value; | |
343 | ||
344 | switch (pt->type) { | |
345 | case NLA_U8: | |
346 | value = nla_get_u8(nla); | |
347 | break; | |
348 | case NLA_U16: | |
349 | value = nla_get_u16(nla); | |
350 | break; | |
351 | case NLA_U32: | |
352 | value = nla_get_u32(nla); | |
353 | break; | |
354 | case NLA_U64: | |
355 | value = nla_get_u64(nla); | |
356 | break; | |
357 | default: | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | if (value & ~(u64)pt->mask) { | |
362 | NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set"); | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
366 | return 0; | |
367 | } | |
368 | ||
3654654f | 369 | static int validate_nla(const struct nlattr *nla, int maxtype, |
8cb08174 | 370 | const struct nla_policy *policy, unsigned int validate, |
7690aa1c | 371 | struct netlink_ext_ack *extack, unsigned int depth) |
bfa83a9e | 372 | { |
56738f46 | 373 | u16 strict_start_type = policy[0].strict_start_type; |
ef7c79ed | 374 | const struct nla_policy *pt; |
8f4c1f9b | 375 | int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla); |
c29f1845 | 376 | int err = -ERANGE; |
bfa83a9e | 377 | |
56738f46 JB |
378 | if (strict_start_type && type >= strict_start_type) |
379 | validate |= NL_VALIDATE_STRICT; | |
380 | ||
8f4c1f9b | 381 | if (type <= 0 || type > maxtype) |
bfa83a9e TG |
382 | return 0; |
383 | ||
8f4c1f9b | 384 | pt = &policy[type]; |
bfa83a9e TG |
385 | |
386 | BUG_ON(pt->type > NLA_TYPE_MAX); | |
387 | ||
8aa26c57 | 388 | if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) { |
6e237d09 DA |
389 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", |
390 | current->comm, type); | |
8cb08174 | 391 | if (validate & NL_VALIDATE_STRICT_ATTRS) { |
44f3625b JB |
392 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
393 | "invalid attribute length"); | |
8cb08174 JB |
394 | return -EINVAL; |
395 | } | |
28033ae4 DA |
396 | } |
397 | ||
b424e432 MK |
398 | if (validate & NL_VALIDATE_NESTED) { |
399 | if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && | |
400 | !(nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
401 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
402 | "NLA_F_NESTED is missing"); | |
b424e432 MK |
403 | return -EINVAL; |
404 | } | |
405 | if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && | |
406 | pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
407 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
408 | "NLA_F_NESTED not expected"); | |
b424e432 MK |
409 | return -EINVAL; |
410 | } | |
411 | } | |
412 | ||
a5531a5d | 413 | switch (pt->type) { |
568b742a | 414 | case NLA_REJECT: |
47a1494b | 415 | if (extack && pt->reject_message) { |
c29f1845 | 416 | NL_SET_BAD_ATTR(extack, nla); |
47a1494b | 417 | extack->_msg = pt->reject_message; |
c29f1845 JB |
418 | return -EINVAL; |
419 | } | |
420 | err = -EINVAL; | |
421 | goto out_err; | |
568b742a | 422 | |
a5531a5d TG |
423 | case NLA_FLAG: |
424 | if (attrlen > 0) | |
c29f1845 | 425 | goto out_err; |
a5531a5d | 426 | break; |
bfa83a9e | 427 | |
64c83d83 JHS |
428 | case NLA_BITFIELD32: |
429 | if (attrlen != sizeof(struct nla_bitfield32)) | |
c29f1845 | 430 | goto out_err; |
64c83d83 | 431 | |
47a1494b | 432 | err = validate_nla_bitfield32(nla, pt->bitfield32_valid); |
c29f1845 JB |
433 | if (err) |
434 | goto out_err; | |
435 | break; | |
64c83d83 | 436 | |
a5531a5d TG |
437 | case NLA_NUL_STRING: |
438 | if (pt->len) | |
439 | minlen = min_t(int, attrlen, pt->len + 1); | |
440 | else | |
441 | minlen = attrlen; | |
bfa83a9e | 442 | |
c29f1845 JB |
443 | if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) { |
444 | err = -EINVAL; | |
445 | goto out_err; | |
446 | } | |
36f9ff9e | 447 | fallthrough; |
a5531a5d TG |
448 | |
449 | case NLA_STRING: | |
450 | if (attrlen < 1) | |
c29f1845 | 451 | goto out_err; |
a5531a5d TG |
452 | |
453 | if (pt->len) { | |
454 | char *buf = nla_data(nla); | |
455 | ||
456 | if (buf[attrlen - 1] == '\0') | |
457 | attrlen--; | |
458 | ||
459 | if (attrlen > pt->len) | |
c29f1845 | 460 | goto out_err; |
a5531a5d TG |
461 | } |
462 | break; | |
463 | ||
d30045a0 JB |
464 | case NLA_BINARY: |
465 | if (pt->len && attrlen > pt->len) | |
c29f1845 | 466 | goto out_err; |
d30045a0 JB |
467 | break; |
468 | ||
ea5693cc PM |
469 | case NLA_NESTED: |
470 | /* a nested attributes is allowed to be empty; if its not, | |
471 | * it must have a size of at least NLA_HDRLEN. | |
472 | */ | |
473 | if (attrlen == 0) | |
474 | break; | |
9a659a35 JB |
475 | if (attrlen < NLA_HDRLEN) |
476 | goto out_err; | |
47a1494b | 477 | if (pt->nested_policy) { |
7690aa1c JB |
478 | err = __nla_validate_parse(nla_data(nla), nla_len(nla), |
479 | pt->len, pt->nested_policy, | |
480 | validate, extack, NULL, | |
481 | depth + 1); | |
9a659a35 JB |
482 | if (err < 0) { |
483 | /* | |
484 | * return directly to preserve the inner | |
485 | * error message/attribute pointer | |
486 | */ | |
487 | return err; | |
488 | } | |
489 | } | |
490 | break; | |
1501d135 JB |
491 | case NLA_NESTED_ARRAY: |
492 | /* a nested array attribute is allowed to be empty; if its not, | |
493 | * it must have a size of at least NLA_HDRLEN. | |
494 | */ | |
495 | if (attrlen == 0) | |
496 | break; | |
497 | if (attrlen < NLA_HDRLEN) | |
498 | goto out_err; | |
47a1494b | 499 | if (pt->nested_policy) { |
1501d135 JB |
500 | int err; |
501 | ||
502 | err = nla_validate_array(nla_data(nla), nla_len(nla), | |
47a1494b | 503 | pt->len, pt->nested_policy, |
7690aa1c | 504 | extack, validate, depth); |
1501d135 JB |
505 | if (err < 0) { |
506 | /* | |
507 | * return directly to preserve the inner | |
508 | * error message/attribute pointer | |
509 | */ | |
510 | return err; | |
511 | } | |
512 | } | |
513 | break; | |
6f455f5f JB |
514 | |
515 | case NLA_UNSPEC: | |
8cb08174 JB |
516 | if (validate & NL_VALIDATE_UNSPEC) { |
517 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
518 | "Unsupported attribute"); | |
519 | return -EINVAL; | |
520 | } | |
6f455f5f JB |
521 | if (attrlen < pt->len) |
522 | goto out_err; | |
523 | break; | |
524 | ||
a5531a5d TG |
525 | default: |
526 | if (pt->len) | |
527 | minlen = pt->len; | |
6f455f5f | 528 | else |
a5531a5d TG |
529 | minlen = nla_attr_minlen[pt->type]; |
530 | ||
531 | if (attrlen < minlen) | |
c29f1845 | 532 | goto out_err; |
a5531a5d | 533 | } |
bfa83a9e | 534 | |
3e48be05 JB |
535 | /* further validation */ |
536 | switch (pt->validation_type) { | |
537 | case NLA_VALIDATE_NONE: | |
538 | /* nothing to do */ | |
539 | break; | |
d06a09b9 | 540 | case NLA_VALIDATE_RANGE_PTR: |
3e48be05 | 541 | case NLA_VALIDATE_RANGE: |
8aa26c57 | 542 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
3e48be05 JB |
543 | case NLA_VALIDATE_MIN: |
544 | case NLA_VALIDATE_MAX: | |
8aa26c57 | 545 | err = nla_validate_int_range(pt, nla, extack, validate); |
3e48be05 JB |
546 | if (err) |
547 | return err; | |
548 | break; | |
bdbb4e29 JK |
549 | case NLA_VALIDATE_MASK: |
550 | err = nla_validate_mask(pt, nla, extack); | |
551 | if (err) | |
552 | return err; | |
553 | break; | |
33188bd6 JB |
554 | case NLA_VALIDATE_FUNCTION: |
555 | if (pt->validate) { | |
556 | err = pt->validate(nla, extack); | |
557 | if (err) | |
558 | return err; | |
559 | } | |
560 | break; | |
3e48be05 JB |
561 | } |
562 | ||
bfa83a9e | 563 | return 0; |
c29f1845 | 564 | out_err: |
44f3625b JB |
565 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
566 | "Attribute failed policy validation"); | |
c29f1845 | 567 | return err; |
bfa83a9e TG |
568 | } |
569 | ||
8cb08174 JB |
570 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, |
571 | const struct nla_policy *policy, | |
572 | unsigned int validate, | |
573 | struct netlink_ext_ack *extack, | |
7690aa1c | 574 | struct nlattr **tb, unsigned int depth) |
8cb08174 JB |
575 | { |
576 | const struct nlattr *nla; | |
577 | int rem; | |
578 | ||
7690aa1c JB |
579 | if (depth >= MAX_POLICY_RECURSION_DEPTH) { |
580 | NL_SET_ERR_MSG(extack, | |
581 | "allowed policy recursion depth exceeded"); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
8cb08174 JB |
585 | if (tb) |
586 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
587 | ||
588 | nla_for_each_attr(nla, head, len, rem) { | |
589 | u16 type = nla_type(nla); | |
590 | ||
591 | if (type == 0 || type > maxtype) { | |
592 | if (validate & NL_VALIDATE_MAXTYPE) { | |
d54a16b2 MK |
593 | NL_SET_ERR_MSG_ATTR(extack, nla, |
594 | "Unknown attribute type"); | |
8cb08174 JB |
595 | return -EINVAL; |
596 | } | |
597 | continue; | |
598 | } | |
599 | if (policy) { | |
600 | int err = validate_nla(nla, maxtype, policy, | |
7690aa1c | 601 | validate, extack, depth); |
8cb08174 JB |
602 | |
603 | if (err < 0) | |
604 | return err; | |
605 | } | |
606 | ||
607 | if (tb) | |
608 | tb[type] = (struct nlattr *)nla; | |
609 | } | |
610 | ||
611 | if (unlikely(rem > 0)) { | |
612 | pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n", | |
613 | rem, current->comm); | |
614 | NL_SET_ERR_MSG(extack, "bytes leftover after parsing attributes"); | |
615 | if (validate & NL_VALIDATE_TRAILING) | |
616 | return -EINVAL; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
bfa83a9e | 622 | /** |
8cb08174 | 623 | * __nla_validate - Validate a stream of attributes |
bfa83a9e TG |
624 | * @head: head of attribute stream |
625 | * @len: length of attribute stream | |
626 | * @maxtype: maximum attribute type to be expected | |
627 | * @policy: validation policy | |
8cb08174 | 628 | * @validate: validation strictness |
fceb6435 | 629 | * @extack: extended ACK report struct |
bfa83a9e TG |
630 | * |
631 | * Validates all attributes in the specified attribute stream against the | |
8cb08174 JB |
632 | * specified policy. Validation depends on the validate flags passed, see |
633 | * &enum netlink_validation for more details on that. | |
9dbbc3b9 | 634 | * See documentation of struct nla_policy for more details. |
bfa83a9e TG |
635 | * |
636 | * Returns 0 on success or a negative error code. | |
637 | */ | |
8cb08174 JB |
638 | int __nla_validate(const struct nlattr *head, int len, int maxtype, |
639 | const struct nla_policy *policy, unsigned int validate, | |
640 | struct netlink_ext_ack *extack) | |
bfa83a9e | 641 | { |
8cb08174 | 642 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 643 | extack, NULL, 0); |
bfa83a9e | 644 | } |
8cb08174 | 645 | EXPORT_SYMBOL(__nla_validate); |
bfa83a9e | 646 | |
e487eb99 | 647 | /** |
9dbbc3b9 | 648 | * nla_policy_len - Determine the max. length of a policy |
8e18be76 | 649 | * @p: policy to use |
e487eb99 HE |
650 | * @n: number of policies |
651 | * | |
652 | * Determines the max. length of the policy. It is currently used | |
653 | * to allocated Netlink buffers roughly the size of the actual | |
654 | * message. | |
655 | * | |
656 | * Returns 0 on success or a negative error code. | |
657 | */ | |
658 | int | |
659 | nla_policy_len(const struct nla_policy *p, int n) | |
660 | { | |
661 | int i, len = 0; | |
662 | ||
e3fa3aff | 663 | for (i = 0; i < n; i++, p++) { |
e487eb99 HE |
664 | if (p->len) |
665 | len += nla_total_size(p->len); | |
28033ae4 DA |
666 | else if (nla_attr_len[p->type]) |
667 | len += nla_total_size(nla_attr_len[p->type]); | |
e487eb99 HE |
668 | else if (nla_attr_minlen[p->type]) |
669 | len += nla_total_size(nla_attr_minlen[p->type]); | |
670 | } | |
671 | ||
672 | return len; | |
673 | } | |
6d6a138f | 674 | EXPORT_SYMBOL(nla_policy_len); |
e487eb99 | 675 | |
bfa83a9e | 676 | /** |
8cb08174 | 677 | * __nla_parse - Parse a stream of attributes into a tb buffer |
bfa83a9e TG |
678 | * @tb: destination array with maxtype+1 elements |
679 | * @maxtype: maximum attribute type to be expected | |
680 | * @head: head of attribute stream | |
681 | * @len: length of attribute stream | |
10b595af | 682 | * @policy: validation policy |
8cb08174 JB |
683 | * @validate: validation strictness |
684 | * @extack: extended ACK pointer | |
bfa83a9e TG |
685 | * |
686 | * Parses a stream of attributes and stores a pointer to each attribute in | |
8cb08174 JB |
687 | * the tb array accessible via the attribute type. |
688 | * Validation is controlled by the @validate parameter. | |
bfa83a9e TG |
689 | * |
690 | * Returns 0 on success or a negative error code. | |
691 | */ | |
8cb08174 JB |
692 | int __nla_parse(struct nlattr **tb, int maxtype, |
693 | const struct nlattr *head, int len, | |
694 | const struct nla_policy *policy, unsigned int validate, | |
695 | struct netlink_ext_ack *extack) | |
a5f6cba2 | 696 | { |
8cb08174 | 697 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 698 | extack, tb, 0); |
a5f6cba2 | 699 | } |
8cb08174 | 700 | EXPORT_SYMBOL(__nla_parse); |
a5f6cba2 | 701 | |
bfa83a9e TG |
702 | /** |
703 | * nla_find - Find a specific attribute in a stream of attributes | |
704 | * @head: head of attribute stream | |
705 | * @len: length of attribute stream | |
706 | * @attrtype: type of attribute to look for | |
707 | * | |
708 | * Returns the first attribute in the stream matching the specified type. | |
709 | */ | |
3654654f | 710 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype) |
bfa83a9e | 711 | { |
3654654f | 712 | const struct nlattr *nla; |
bfa83a9e TG |
713 | int rem; |
714 | ||
715 | nla_for_each_attr(nla, head, len, rem) | |
8f4c1f9b | 716 | if (nla_type(nla) == attrtype) |
3654654f | 717 | return (struct nlattr *)nla; |
bfa83a9e TG |
718 | |
719 | return NULL; | |
720 | } | |
6d6a138f | 721 | EXPORT_SYMBOL(nla_find); |
bfa83a9e TG |
722 | |
723 | /** | |
872f6903 | 724 | * nla_strscpy - Copy string attribute payload into a sized buffer |
9ca71874 FL |
725 | * @dst: Where to copy the string to. |
726 | * @nla: Attribute to copy the string from. | |
727 | * @dstsize: Size of destination buffer. | |
bfa83a9e TG |
728 | * |
729 | * Copies at most dstsize - 1 bytes into the destination buffer. | |
9ca71874 | 730 | * Unlike strlcpy the destination buffer is always padded out. |
bfa83a9e | 731 | * |
9ca71874 FL |
732 | * Return: |
733 | * * srclen - Returns @nla length (not including the trailing %NUL). | |
734 | * * -E2BIG - If @dstsize is 0 or greater than U16_MAX or @nla length greater | |
735 | * than @dstsize. | |
bfa83a9e | 736 | */ |
872f6903 | 737 | ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize) |
bfa83a9e TG |
738 | { |
739 | size_t srclen = nla_len(nla); | |
740 | char *src = nla_data(nla); | |
9ca71874 FL |
741 | ssize_t ret; |
742 | size_t len; | |
743 | ||
744 | if (dstsize == 0 || WARN_ON_ONCE(dstsize > U16_MAX)) | |
745 | return -E2BIG; | |
bfa83a9e TG |
746 | |
747 | if (srclen > 0 && src[srclen - 1] == '\0') | |
748 | srclen--; | |
749 | ||
9ca71874 FL |
750 | if (srclen >= dstsize) { |
751 | len = dstsize - 1; | |
752 | ret = -E2BIG; | |
753 | } else { | |
754 | len = srclen; | |
755 | ret = len; | |
bfa83a9e TG |
756 | } |
757 | ||
9ca71874 FL |
758 | memcpy(dst, src, len); |
759 | /* Zero pad end of dst. */ | |
760 | memset(dst + len, 0, dstsize - len); | |
761 | ||
762 | return ret; | |
bfa83a9e | 763 | } |
872f6903 | 764 | EXPORT_SYMBOL(nla_strscpy); |
bfa83a9e | 765 | |
2cf0c8b3 PS |
766 | /** |
767 | * nla_strdup - Copy string attribute payload into a newly allocated buffer | |
768 | * @nla: attribute to copy the string from | |
769 | * @flags: the type of memory to allocate (see kmalloc). | |
770 | * | |
771 | * Returns a pointer to the allocated buffer or NULL on error. | |
772 | */ | |
773 | char *nla_strdup(const struct nlattr *nla, gfp_t flags) | |
774 | { | |
775 | size_t srclen = nla_len(nla); | |
776 | char *src = nla_data(nla), *dst; | |
777 | ||
778 | if (srclen > 0 && src[srclen - 1] == '\0') | |
779 | srclen--; | |
780 | ||
781 | dst = kmalloc(srclen + 1, flags); | |
782 | if (dst != NULL) { | |
783 | memcpy(dst, src, srclen); | |
784 | dst[srclen] = '\0'; | |
785 | } | |
786 | return dst; | |
787 | } | |
788 | EXPORT_SYMBOL(nla_strdup); | |
789 | ||
bfa83a9e TG |
790 | /** |
791 | * nla_memcpy - Copy a netlink attribute into another memory area | |
792 | * @dest: where to copy to memcpy | |
793 | * @src: netlink attribute to copy from | |
794 | * @count: size of the destination area | |
795 | * | |
796 | * Note: The number of bytes copied is limited by the length of | |
797 | * attribute's payload. memcpy | |
798 | * | |
799 | * Returns the number of bytes copied. | |
800 | */ | |
b057efd4 | 801 | int nla_memcpy(void *dest, const struct nlattr *src, int count) |
bfa83a9e TG |
802 | { |
803 | int minlen = min_t(int, count, nla_len(src)); | |
804 | ||
805 | memcpy(dest, nla_data(src), minlen); | |
5899f047 JB |
806 | if (count > minlen) |
807 | memset(dest + minlen, 0, count - minlen); | |
bfa83a9e TG |
808 | |
809 | return minlen; | |
810 | } | |
6d6a138f | 811 | EXPORT_SYMBOL(nla_memcpy); |
bfa83a9e TG |
812 | |
813 | /** | |
814 | * nla_memcmp - Compare an attribute with sized memory area | |
815 | * @nla: netlink attribute | |
816 | * @data: memory area | |
817 | * @size: size of memory area | |
818 | */ | |
819 | int nla_memcmp(const struct nlattr *nla, const void *data, | |
820 | size_t size) | |
821 | { | |
822 | int d = nla_len(nla) - size; | |
823 | ||
824 | if (d == 0) | |
825 | d = memcmp(nla_data(nla), data, size); | |
826 | ||
827 | return d; | |
828 | } | |
6d6a138f | 829 | EXPORT_SYMBOL(nla_memcmp); |
bfa83a9e TG |
830 | |
831 | /** | |
832 | * nla_strcmp - Compare a string attribute against a string | |
833 | * @nla: netlink string attribute | |
834 | * @str: another string | |
835 | */ | |
836 | int nla_strcmp(const struct nlattr *nla, const char *str) | |
837 | { | |
8b7b9324 PN |
838 | int len = strlen(str); |
839 | char *buf = nla_data(nla); | |
840 | int attrlen = nla_len(nla); | |
841 | int d; | |
bfa83a9e | 842 | |
2c16db6c | 843 | while (attrlen > 0 && buf[attrlen - 1] == '\0') |
8b7b9324 PN |
844 | attrlen--; |
845 | ||
846 | d = attrlen - len; | |
bfa83a9e TG |
847 | if (d == 0) |
848 | d = memcmp(nla_data(nla), str, len); | |
849 | ||
850 | return d; | |
851 | } | |
6d6a138f | 852 | EXPORT_SYMBOL(nla_strcmp); |
bfa83a9e | 853 | |
90800216 | 854 | #ifdef CONFIG_NET |
bfa83a9e TG |
855 | /** |
856 | * __nla_reserve - reserve room for attribute on the skb | |
857 | * @skb: socket buffer to reserve room on | |
858 | * @attrtype: attribute type | |
859 | * @attrlen: length of attribute payload | |
860 | * | |
861 | * Adds a netlink attribute header to a socket buffer and reserves | |
862 | * room for the payload but does not copy it. | |
863 | * | |
864 | * The caller is responsible to ensure that the skb provides enough | |
865 | * tailroom for the attribute header and payload. | |
866 | */ | |
867 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
868 | { | |
869 | struct nlattr *nla; | |
870 | ||
4df864c1 | 871 | nla = skb_put(skb, nla_total_size(attrlen)); |
bfa83a9e TG |
872 | nla->nla_type = attrtype; |
873 | nla->nla_len = nla_attr_size(attrlen); | |
874 | ||
875 | memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); | |
876 | ||
877 | return nla; | |
878 | } | |
90800216 | 879 | EXPORT_SYMBOL(__nla_reserve); |
bfa83a9e | 880 | |
089bf1a6 ND |
881 | /** |
882 | * __nla_reserve_64bit - reserve room for attribute on the skb and align it | |
883 | * @skb: socket buffer to reserve room on | |
884 | * @attrtype: attribute type | |
885 | * @attrlen: length of attribute payload | |
11a99573 | 886 | * @padattr: attribute type for the padding |
089bf1a6 ND |
887 | * |
888 | * Adds a netlink attribute header to a socket buffer and reserves | |
889 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 890 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
891 | * |
892 | * The caller is responsible to ensure that the skb provides enough | |
893 | * tailroom for the attribute header and payload. | |
894 | */ | |
895 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, | |
896 | int attrlen, int padattr) | |
897 | { | |
4718a471 | 898 | nla_align_64bit(skb, padattr); |
089bf1a6 ND |
899 | |
900 | return __nla_reserve(skb, attrtype, attrlen); | |
901 | } | |
902 | EXPORT_SYMBOL(__nla_reserve_64bit); | |
903 | ||
fe4944e5 TG |
904 | /** |
905 | * __nla_reserve_nohdr - reserve room for attribute without header | |
906 | * @skb: socket buffer to reserve room on | |
907 | * @attrlen: length of attribute payload | |
908 | * | |
909 | * Reserves room for attribute payload without a header. | |
910 | * | |
911 | * The caller is responsible to ensure that the skb provides enough | |
912 | * tailroom for the payload. | |
913 | */ | |
914 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
915 | { | |
b952f4df | 916 | return skb_put_zero(skb, NLA_ALIGN(attrlen)); |
fe4944e5 | 917 | } |
90800216 | 918 | EXPORT_SYMBOL(__nla_reserve_nohdr); |
fe4944e5 | 919 | |
bfa83a9e TG |
920 | /** |
921 | * nla_reserve - reserve room for attribute on the skb | |
922 | * @skb: socket buffer to reserve room on | |
923 | * @attrtype: attribute type | |
924 | * @attrlen: length of attribute payload | |
925 | * | |
926 | * Adds a netlink attribute header to a socket buffer and reserves | |
927 | * room for the payload but does not copy it. | |
928 | * | |
929 | * Returns NULL if the tailroom of the skb is insufficient to store | |
930 | * the attribute header and payload. | |
931 | */ | |
932 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
933 | { | |
934 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
935 | return NULL; | |
936 | ||
937 | return __nla_reserve(skb, attrtype, attrlen); | |
938 | } | |
90800216 | 939 | EXPORT_SYMBOL(nla_reserve); |
bfa83a9e | 940 | |
089bf1a6 ND |
941 | /** |
942 | * nla_reserve_64bit - reserve room for attribute on the skb and align it | |
943 | * @skb: socket buffer to reserve room on | |
944 | * @attrtype: attribute type | |
945 | * @attrlen: length of attribute payload | |
11a99573 | 946 | * @padattr: attribute type for the padding |
089bf1a6 ND |
947 | * |
948 | * Adds a netlink attribute header to a socket buffer and reserves | |
949 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 950 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
951 | * |
952 | * Returns NULL if the tailroom of the skb is insufficient to store | |
953 | * the attribute header and payload. | |
954 | */ | |
955 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
956 | int padattr) | |
957 | { | |
958 | size_t len; | |
959 | ||
960 | if (nla_need_padding_for_64bit(skb)) | |
961 | len = nla_total_size_64bit(attrlen); | |
962 | else | |
963 | len = nla_total_size(attrlen); | |
964 | if (unlikely(skb_tailroom(skb) < len)) | |
965 | return NULL; | |
966 | ||
967 | return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
968 | } | |
969 | EXPORT_SYMBOL(nla_reserve_64bit); | |
970 | ||
fe4944e5 | 971 | /** |
10b595af | 972 | * nla_reserve_nohdr - reserve room for attribute without header |
fe4944e5 | 973 | * @skb: socket buffer to reserve room on |
10b595af | 974 | * @attrlen: length of attribute payload |
fe4944e5 TG |
975 | * |
976 | * Reserves room for attribute payload without a header. | |
977 | * | |
978 | * Returns NULL if the tailroom of the skb is insufficient to store | |
979 | * the attribute payload. | |
980 | */ | |
981 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
982 | { | |
983 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
984 | return NULL; | |
985 | ||
986 | return __nla_reserve_nohdr(skb, attrlen); | |
987 | } | |
90800216 | 988 | EXPORT_SYMBOL(nla_reserve_nohdr); |
fe4944e5 | 989 | |
bfa83a9e TG |
990 | /** |
991 | * __nla_put - Add a netlink attribute to a socket buffer | |
992 | * @skb: socket buffer to add attribute to | |
993 | * @attrtype: attribute type | |
994 | * @attrlen: length of attribute payload | |
995 | * @data: head of attribute payload | |
996 | * | |
997 | * The caller is responsible to ensure that the skb provides enough | |
998 | * tailroom for the attribute header and payload. | |
999 | */ | |
1000 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
1001 | const void *data) | |
1002 | { | |
1003 | struct nlattr *nla; | |
1004 | ||
1005 | nla = __nla_reserve(skb, attrtype, attrlen); | |
1006 | memcpy(nla_data(nla), data, attrlen); | |
1007 | } | |
90800216 | 1008 | EXPORT_SYMBOL(__nla_put); |
bfa83a9e | 1009 | |
089bf1a6 ND |
1010 | /** |
1011 | * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
1012 | * @skb: socket buffer to add attribute to | |
1013 | * @attrtype: attribute type | |
1014 | * @attrlen: length of attribute payload | |
1015 | * @data: head of attribute payload | |
11a99573 | 1016 | * @padattr: attribute type for the padding |
089bf1a6 ND |
1017 | * |
1018 | * The caller is responsible to ensure that the skb provides enough | |
1019 | * tailroom for the attribute header and payload. | |
1020 | */ | |
1021 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
1022 | const void *data, int padattr) | |
1023 | { | |
1024 | struct nlattr *nla; | |
1025 | ||
1026 | nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
1027 | memcpy(nla_data(nla), data, attrlen); | |
1028 | } | |
1029 | EXPORT_SYMBOL(__nla_put_64bit); | |
1030 | ||
fe4944e5 TG |
1031 | /** |
1032 | * __nla_put_nohdr - Add a netlink attribute without header | |
1033 | * @skb: socket buffer to add attribute to | |
1034 | * @attrlen: length of attribute payload | |
1035 | * @data: head of attribute payload | |
1036 | * | |
1037 | * The caller is responsible to ensure that the skb provides enough | |
1038 | * tailroom for the attribute payload. | |
1039 | */ | |
1040 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1041 | { | |
1042 | void *start; | |
1043 | ||
1044 | start = __nla_reserve_nohdr(skb, attrlen); | |
1045 | memcpy(start, data, attrlen); | |
1046 | } | |
90800216 | 1047 | EXPORT_SYMBOL(__nla_put_nohdr); |
bfa83a9e TG |
1048 | |
1049 | /** | |
1050 | * nla_put - Add a netlink attribute to a socket buffer | |
1051 | * @skb: socket buffer to add attribute to | |
1052 | * @attrtype: attribute type | |
1053 | * @attrlen: length of attribute payload | |
1054 | * @data: head of attribute payload | |
1055 | * | |
bc3ed28c | 1056 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
bfa83a9e TG |
1057 | * the attribute header and payload. |
1058 | */ | |
1059 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
1060 | { | |
1061 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
bc3ed28c | 1062 | return -EMSGSIZE; |
bfa83a9e TG |
1063 | |
1064 | __nla_put(skb, attrtype, attrlen, data); | |
1065 | return 0; | |
1066 | } | |
90800216 | 1067 | EXPORT_SYMBOL(nla_put); |
bfa83a9e | 1068 | |
089bf1a6 ND |
1069 | /** |
1070 | * nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
1071 | * @skb: socket buffer to add attribute to | |
1072 | * @attrtype: attribute type | |
1073 | * @attrlen: length of attribute payload | |
1074 | * @data: head of attribute payload | |
11a99573 | 1075 | * @padattr: attribute type for the padding |
089bf1a6 ND |
1076 | * |
1077 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store | |
1078 | * the attribute header and payload. | |
1079 | */ | |
1080 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
1081 | const void *data, int padattr) | |
1082 | { | |
1083 | size_t len; | |
1084 | ||
1085 | if (nla_need_padding_for_64bit(skb)) | |
1086 | len = nla_total_size_64bit(attrlen); | |
1087 | else | |
1088 | len = nla_total_size(attrlen); | |
1089 | if (unlikely(skb_tailroom(skb) < len)) | |
1090 | return -EMSGSIZE; | |
1091 | ||
1092 | __nla_put_64bit(skb, attrtype, attrlen, data, padattr); | |
1093 | return 0; | |
1094 | } | |
1095 | EXPORT_SYMBOL(nla_put_64bit); | |
1096 | ||
fe4944e5 TG |
1097 | /** |
1098 | * nla_put_nohdr - Add a netlink attribute without header | |
1099 | * @skb: socket buffer to add attribute to | |
1100 | * @attrlen: length of attribute payload | |
1101 | * @data: head of attribute payload | |
1102 | * | |
bc3ed28c | 1103 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
fe4944e5 TG |
1104 | * the attribute payload. |
1105 | */ | |
1106 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1107 | { | |
1108 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1109 | return -EMSGSIZE; |
fe4944e5 TG |
1110 | |
1111 | __nla_put_nohdr(skb, attrlen, data); | |
1112 | return 0; | |
1113 | } | |
90800216 | 1114 | EXPORT_SYMBOL(nla_put_nohdr); |
bfa83a9e | 1115 | |
01480e1c PM |
1116 | /** |
1117 | * nla_append - Add a netlink attribute without header or padding | |
1118 | * @skb: socket buffer to add attribute to | |
1119 | * @attrlen: length of attribute payload | |
1120 | * @data: head of attribute payload | |
1121 | * | |
bc3ed28c | 1122 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
01480e1c PM |
1123 | * the attribute payload. |
1124 | */ | |
1125 | int nla_append(struct sk_buff *skb, int attrlen, const void *data) | |
1126 | { | |
1127 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1128 | return -EMSGSIZE; |
01480e1c | 1129 | |
59ae1d12 | 1130 | skb_put_data(skb, data, attrlen); |
01480e1c PM |
1131 | return 0; |
1132 | } | |
90800216 HX |
1133 | EXPORT_SYMBOL(nla_append); |
1134 | #endif |