Commit | Line | Data |
---|---|---|
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> | |
f0950402 | 13 | #include <linux/nospec.h> |
bfa83a9e TG |
14 | #include <linux/skbuff.h> |
15 | #include <linux/string.h> | |
16 | #include <linux/types.h> | |
17 | #include <net/netlink.h> | |
18 | ||
6e237d09 DA |
19 | /* For these data types, attribute length should be exactly the given |
20 | * size. However, to maintain compatibility with broken commands, if the | |
21 | * attribute length does not match the expected size a warning is emitted | |
22 | * to the user that the command is sending invalid data and needs to be fixed. | |
23 | */ | |
28033ae4 | 24 | static const u8 nla_attr_len[NLA_TYPE_MAX+1] = { |
bfa83a9e TG |
25 | [NLA_U8] = sizeof(u8), |
26 | [NLA_U16] = sizeof(u16), | |
27 | [NLA_U32] = sizeof(u32), | |
28 | [NLA_U64] = sizeof(u64), | |
9eca2eb9 JA |
29 | [NLA_S8] = sizeof(s8), |
30 | [NLA_S16] = sizeof(s16), | |
31 | [NLA_S32] = sizeof(s32), | |
32 | [NLA_S64] = sizeof(s64), | |
bfa83a9e TG |
33 | }; |
34 | ||
28033ae4 | 35 | static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = { |
6e237d09 DA |
36 | [NLA_U8] = sizeof(u8), |
37 | [NLA_U16] = sizeof(u16), | |
38 | [NLA_U32] = sizeof(u32), | |
39 | [NLA_U64] = sizeof(u64), | |
28033ae4 DA |
40 | [NLA_MSECS] = sizeof(u64), |
41 | [NLA_NESTED] = NLA_HDRLEN, | |
6e237d09 DA |
42 | [NLA_S8] = sizeof(s8), |
43 | [NLA_S16] = sizeof(s16), | |
44 | [NLA_S32] = sizeof(s32), | |
45 | [NLA_S64] = sizeof(s64), | |
28033ae4 DA |
46 | }; |
47 | ||
7690aa1c JB |
48 | /* |
49 | * Nested policies might refer back to the original | |
50 | * policy in some cases, and userspace could try to | |
51 | * abuse that and recurse by nesting in the right | |
52 | * ways. Limit recursion to avoid this problem. | |
53 | */ | |
54 | #define MAX_POLICY_RECURSION_DEPTH 10 | |
55 | ||
56 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, | |
57 | const struct nla_policy *policy, | |
58 | unsigned int validate, | |
59 | struct netlink_ext_ack *extack, | |
60 | struct nlattr **tb, unsigned int depth); | |
61 | ||
64c83d83 | 62 | static int validate_nla_bitfield32(const struct nlattr *nla, |
47a1494b | 63 | const u32 valid_flags_mask) |
64c83d83 JHS |
64 | { |
65 | const struct nla_bitfield32 *bf = nla_data(nla); | |
64c83d83 | 66 | |
48fde90a | 67 | if (!valid_flags_mask) |
64c83d83 JHS |
68 | return -EINVAL; |
69 | ||
70 | /*disallow invalid bit selector */ | |
47a1494b | 71 | if (bf->selector & ~valid_flags_mask) |
64c83d83 JHS |
72 | return -EINVAL; |
73 | ||
74 | /*disallow invalid bit values */ | |
47a1494b | 75 | if (bf->value & ~valid_flags_mask) |
64c83d83 JHS |
76 | return -EINVAL; |
77 | ||
78 | /*disallow valid bit values that are not selected*/ | |
79 | if (bf->value & ~bf->selector) | |
80 | return -EINVAL; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
1501d135 JB |
85 | static int nla_validate_array(const struct nlattr *head, int len, int maxtype, |
86 | const struct nla_policy *policy, | |
8cb08174 | 87 | struct netlink_ext_ack *extack, |
7690aa1c | 88 | unsigned int validate, unsigned int depth) |
1501d135 JB |
89 | { |
90 | const struct nlattr *entry; | |
91 | int rem; | |
92 | ||
93 | nla_for_each_attr(entry, head, len, rem) { | |
94 | int ret; | |
95 | ||
96 | if (nla_len(entry) == 0) | |
97 | continue; | |
98 | ||
99 | if (nla_len(entry) < NLA_HDRLEN) { | |
44f3625b JB |
100 | NL_SET_ERR_MSG_ATTR_POL(extack, entry, policy, |
101 | "Array element too short"); | |
1501d135 JB |
102 | return -ERANGE; |
103 | } | |
104 | ||
7690aa1c JB |
105 | ret = __nla_validate_parse(nla_data(entry), nla_len(entry), |
106 | maxtype, policy, validate, extack, | |
107 | NULL, depth + 1); | |
1501d135 JB |
108 | if (ret < 0) |
109 | return ret; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
2c28ae48 JB |
115 | void nla_get_range_unsigned(const struct nla_policy *pt, |
116 | struct netlink_range_validation *range) | |
3e48be05 | 117 | { |
d06a09b9 JB |
118 | WARN_ON_ONCE(pt->validation_type != NLA_VALIDATE_RANGE_PTR && |
119 | (pt->min < 0 || pt->max < 0)); | |
120 | ||
2c28ae48 JB |
121 | range->min = 0; |
122 | ||
123 | switch (pt->type) { | |
124 | case NLA_U8: | |
125 | range->max = U8_MAX; | |
126 | break; | |
127 | case NLA_U16: | |
ecaf75ff | 128 | case NLA_BE16: |
8aa26c57 | 129 | case NLA_BINARY: |
2c28ae48 JB |
130 | range->max = U16_MAX; |
131 | break; | |
132 | case NLA_U32: | |
ecaf75ff | 133 | case NLA_BE32: |
2c28ae48 JB |
134 | range->max = U32_MAX; |
135 | break; | |
136 | case NLA_U64: | |
137 | case NLA_MSECS: | |
138 | range->max = U64_MAX; | |
139 | break; | |
140 | default: | |
141 | WARN_ON_ONCE(1); | |
142 | return; | |
143 | } | |
144 | ||
d06a09b9 JB |
145 | switch (pt->validation_type) { |
146 | case NLA_VALIDATE_RANGE: | |
8aa26c57 | 147 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
d06a09b9 JB |
148 | range->min = pt->min; |
149 | range->max = pt->max; | |
150 | break; | |
151 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 152 | *range = *pt->range; |
d06a09b9 JB |
153 | break; |
154 | case NLA_VALIDATE_MIN: | |
155 | range->min = pt->min; | |
156 | break; | |
157 | case NLA_VALIDATE_MAX: | |
158 | range->max = pt->max; | |
159 | break; | |
2c28ae48 JB |
160 | default: |
161 | break; | |
d06a09b9 | 162 | } |
2c28ae48 JB |
163 | } |
164 | ||
8aa26c57 JB |
165 | static int nla_validate_range_unsigned(const struct nla_policy *pt, |
166 | const struct nlattr *nla, | |
167 | struct netlink_ext_ack *extack, | |
168 | unsigned int validate) | |
2c28ae48 JB |
169 | { |
170 | struct netlink_range_validation range; | |
171 | u64 value; | |
3e48be05 JB |
172 | |
173 | switch (pt->type) { | |
174 | case NLA_U8: | |
175 | value = nla_get_u8(nla); | |
176 | break; | |
177 | case NLA_U16: | |
ecaf75ff FW |
178 | value = nla_get_u16(nla); |
179 | break; | |
3e48be05 | 180 | case NLA_U32: |
ecaf75ff FW |
181 | value = nla_get_u32(nla); |
182 | break; | |
d06a09b9 | 183 | case NLA_U64: |
ecaf75ff | 184 | value = nla_get_u64(nla); |
08724ef6 | 185 | break; |
da4063bd | 186 | case NLA_MSECS: |
d06a09b9 JB |
187 | value = nla_get_u64(nla); |
188 | break; | |
8aa26c57 JB |
189 | case NLA_BINARY: |
190 | value = nla_len(nla); | |
191 | break; | |
ecaf75ff FW |
192 | case NLA_BE16: |
193 | value = ntohs(nla_get_be16(nla)); | |
194 | break; | |
195 | case NLA_BE32: | |
196 | value = ntohl(nla_get_be32(nla)); | |
197 | break; | |
d06a09b9 JB |
198 | default: |
199 | return -EINVAL; | |
200 | } | |
201 | ||
2c28ae48 JB |
202 | nla_get_range_unsigned(pt, &range); |
203 | ||
8aa26c57 JB |
204 | if (pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG && |
205 | pt->type == NLA_BINARY && value > range.max) { | |
206 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", | |
207 | current->comm, pt->type); | |
208 | if (validate & NL_VALIDATE_STRICT_ATTRS) { | |
44f3625b JB |
209 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
210 | "invalid attribute length"); | |
8aa26c57 JB |
211 | return -EINVAL; |
212 | } | |
213 | ||
214 | /* this assumes min <= max (don't validate against min) */ | |
215 | return 0; | |
216 | } | |
217 | ||
2c28ae48 | 218 | if (value < range.min || value > range.max) { |
8aa26c57 JB |
219 | bool binary = pt->type == NLA_BINARY; |
220 | ||
221 | if (binary) | |
44f3625b JB |
222 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
223 | "binary attribute size out of range"); | |
8aa26c57 | 224 | else |
44f3625b JB |
225 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
226 | "integer out of range"); | |
8aa26c57 | 227 | |
d06a09b9 JB |
228 | return -ERANGE; |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
2c28ae48 JB |
234 | void nla_get_range_signed(const struct nla_policy *pt, |
235 | struct netlink_range_validation_signed *range) | |
d06a09b9 | 236 | { |
2c28ae48 JB |
237 | switch (pt->type) { |
238 | case NLA_S8: | |
239 | range->min = S8_MIN; | |
240 | range->max = S8_MAX; | |
241 | break; | |
242 | case NLA_S16: | |
243 | range->min = S16_MIN; | |
244 | range->max = S16_MAX; | |
245 | break; | |
246 | case NLA_S32: | |
247 | range->min = S32_MIN; | |
248 | range->max = S32_MAX; | |
249 | break; | |
250 | case NLA_S64: | |
251 | range->min = S64_MIN; | |
252 | range->max = S64_MAX; | |
253 | break; | |
254 | default: | |
255 | WARN_ON_ONCE(1); | |
256 | return; | |
257 | } | |
d06a09b9 JB |
258 | |
259 | switch (pt->validation_type) { | |
260 | case NLA_VALIDATE_RANGE: | |
261 | range->min = pt->min; | |
262 | range->max = pt->max; | |
263 | break; | |
264 | case NLA_VALIDATE_RANGE_PTR: | |
2c28ae48 | 265 | *range = *pt->range_signed; |
d06a09b9 JB |
266 | break; |
267 | case NLA_VALIDATE_MIN: | |
268 | range->min = pt->min; | |
269 | break; | |
270 | case NLA_VALIDATE_MAX: | |
271 | range->max = pt->max; | |
272 | break; | |
2c28ae48 JB |
273 | default: |
274 | break; | |
d06a09b9 | 275 | } |
2c28ae48 JB |
276 | } |
277 | ||
278 | static int nla_validate_int_range_signed(const struct nla_policy *pt, | |
279 | const struct nlattr *nla, | |
280 | struct netlink_ext_ack *extack) | |
281 | { | |
282 | struct netlink_range_validation_signed range; | |
283 | s64 value; | |
d06a09b9 JB |
284 | |
285 | switch (pt->type) { | |
3e48be05 JB |
286 | case NLA_S8: |
287 | value = nla_get_s8(nla); | |
288 | break; | |
289 | case NLA_S16: | |
290 | value = nla_get_s16(nla); | |
291 | break; | |
292 | case NLA_S32: | |
293 | value = nla_get_s32(nla); | |
294 | break; | |
295 | case NLA_S64: | |
296 | value = nla_get_s64(nla); | |
297 | break; | |
3e48be05 | 298 | default: |
3e48be05 JB |
299 | return -EINVAL; |
300 | } | |
301 | ||
2c28ae48 JB |
302 | nla_get_range_signed(pt, &range); |
303 | ||
304 | if (value < range.min || value > range.max) { | |
44f3625b JB |
305 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
306 | "integer out of range"); | |
3e48be05 JB |
307 | return -ERANGE; |
308 | } | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
d06a09b9 JB |
313 | static int nla_validate_int_range(const struct nla_policy *pt, |
314 | const struct nlattr *nla, | |
8aa26c57 JB |
315 | struct netlink_ext_ack *extack, |
316 | unsigned int validate) | |
d06a09b9 JB |
317 | { |
318 | switch (pt->type) { | |
319 | case NLA_U8: | |
320 | case NLA_U16: | |
321 | case NLA_U32: | |
322 | case NLA_U64: | |
da4063bd | 323 | case NLA_MSECS: |
8aa26c57 | 324 | case NLA_BINARY: |
ecaf75ff FW |
325 | case NLA_BE16: |
326 | case NLA_BE32: | |
8aa26c57 | 327 | return nla_validate_range_unsigned(pt, nla, extack, validate); |
d06a09b9 JB |
328 | case NLA_S8: |
329 | case NLA_S16: | |
330 | case NLA_S32: | |
331 | case NLA_S64: | |
332 | return nla_validate_int_range_signed(pt, nla, extack); | |
333 | default: | |
334 | WARN_ON(1); | |
335 | return -EINVAL; | |
336 | } | |
337 | } | |
338 | ||
bdbb4e29 JK |
339 | static int nla_validate_mask(const struct nla_policy *pt, |
340 | const struct nlattr *nla, | |
341 | struct netlink_ext_ack *extack) | |
342 | { | |
343 | u64 value; | |
344 | ||
345 | switch (pt->type) { | |
346 | case NLA_U8: | |
347 | value = nla_get_u8(nla); | |
348 | break; | |
349 | case NLA_U16: | |
350 | value = nla_get_u16(nla); | |
351 | break; | |
352 | case NLA_U32: | |
353 | value = nla_get_u32(nla); | |
354 | break; | |
355 | case NLA_U64: | |
356 | value = nla_get_u64(nla); | |
357 | break; | |
358 | default: | |
359 | return -EINVAL; | |
360 | } | |
361 | ||
362 | if (value & ~(u64)pt->mask) { | |
363 | NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set"); | |
364 | return -EINVAL; | |
365 | } | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
3654654f | 370 | static int validate_nla(const struct nlattr *nla, int maxtype, |
8cb08174 | 371 | const struct nla_policy *policy, unsigned int validate, |
7690aa1c | 372 | struct netlink_ext_ack *extack, unsigned int depth) |
bfa83a9e | 373 | { |
56738f46 | 374 | u16 strict_start_type = policy[0].strict_start_type; |
ef7c79ed | 375 | const struct nla_policy *pt; |
8f4c1f9b | 376 | int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla); |
c29f1845 | 377 | int err = -ERANGE; |
bfa83a9e | 378 | |
56738f46 JB |
379 | if (strict_start_type && type >= strict_start_type) |
380 | validate |= NL_VALIDATE_STRICT; | |
381 | ||
8f4c1f9b | 382 | if (type <= 0 || type > maxtype) |
bfa83a9e TG |
383 | return 0; |
384 | ||
f0950402 | 385 | type = array_index_nospec(type, maxtype + 1); |
8f4c1f9b | 386 | pt = &policy[type]; |
bfa83a9e TG |
387 | |
388 | BUG_ON(pt->type > NLA_TYPE_MAX); | |
389 | ||
8aa26c57 | 390 | if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) { |
6e237d09 DA |
391 | pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n", |
392 | current->comm, type); | |
8cb08174 | 393 | if (validate & NL_VALIDATE_STRICT_ATTRS) { |
44f3625b JB |
394 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
395 | "invalid attribute length"); | |
8cb08174 JB |
396 | return -EINVAL; |
397 | } | |
28033ae4 DA |
398 | } |
399 | ||
b424e432 MK |
400 | if (validate & NL_VALIDATE_NESTED) { |
401 | if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && | |
402 | !(nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
403 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
404 | "NLA_F_NESTED is missing"); | |
b424e432 MK |
405 | return -EINVAL; |
406 | } | |
407 | if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && | |
408 | pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { | |
44f3625b JB |
409 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
410 | "NLA_F_NESTED not expected"); | |
b424e432 MK |
411 | return -EINVAL; |
412 | } | |
413 | } | |
414 | ||
a5531a5d | 415 | switch (pt->type) { |
568b742a | 416 | case NLA_REJECT: |
47a1494b | 417 | if (extack && pt->reject_message) { |
c29f1845 | 418 | NL_SET_BAD_ATTR(extack, nla); |
47a1494b | 419 | extack->_msg = pt->reject_message; |
c29f1845 JB |
420 | return -EINVAL; |
421 | } | |
422 | err = -EINVAL; | |
423 | goto out_err; | |
568b742a | 424 | |
a5531a5d TG |
425 | case NLA_FLAG: |
426 | if (attrlen > 0) | |
c29f1845 | 427 | goto out_err; |
a5531a5d | 428 | break; |
bfa83a9e | 429 | |
64c83d83 JHS |
430 | case NLA_BITFIELD32: |
431 | if (attrlen != sizeof(struct nla_bitfield32)) | |
c29f1845 | 432 | goto out_err; |
64c83d83 | 433 | |
47a1494b | 434 | err = validate_nla_bitfield32(nla, pt->bitfield32_valid); |
c29f1845 JB |
435 | if (err) |
436 | goto out_err; | |
437 | break; | |
64c83d83 | 438 | |
a5531a5d TG |
439 | case NLA_NUL_STRING: |
440 | if (pt->len) | |
441 | minlen = min_t(int, attrlen, pt->len + 1); | |
442 | else | |
443 | minlen = attrlen; | |
bfa83a9e | 444 | |
c29f1845 JB |
445 | if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) { |
446 | err = -EINVAL; | |
447 | goto out_err; | |
448 | } | |
36f9ff9e | 449 | fallthrough; |
a5531a5d TG |
450 | |
451 | case NLA_STRING: | |
452 | if (attrlen < 1) | |
c29f1845 | 453 | goto out_err; |
a5531a5d TG |
454 | |
455 | if (pt->len) { | |
456 | char *buf = nla_data(nla); | |
457 | ||
458 | if (buf[attrlen - 1] == '\0') | |
459 | attrlen--; | |
460 | ||
461 | if (attrlen > pt->len) | |
c29f1845 | 462 | goto out_err; |
a5531a5d TG |
463 | } |
464 | break; | |
465 | ||
d30045a0 JB |
466 | case NLA_BINARY: |
467 | if (pt->len && attrlen > pt->len) | |
c29f1845 | 468 | goto out_err; |
d30045a0 JB |
469 | break; |
470 | ||
ea5693cc PM |
471 | case NLA_NESTED: |
472 | /* a nested attributes is allowed to be empty; if its not, | |
473 | * it must have a size of at least NLA_HDRLEN. | |
474 | */ | |
475 | if (attrlen == 0) | |
476 | break; | |
9a659a35 JB |
477 | if (attrlen < NLA_HDRLEN) |
478 | goto out_err; | |
47a1494b | 479 | if (pt->nested_policy) { |
7690aa1c JB |
480 | err = __nla_validate_parse(nla_data(nla), nla_len(nla), |
481 | pt->len, pt->nested_policy, | |
482 | validate, extack, NULL, | |
483 | depth + 1); | |
9a659a35 JB |
484 | if (err < 0) { |
485 | /* | |
486 | * return directly to preserve the inner | |
487 | * error message/attribute pointer | |
488 | */ | |
489 | return err; | |
490 | } | |
491 | } | |
492 | break; | |
1501d135 JB |
493 | case NLA_NESTED_ARRAY: |
494 | /* a nested array attribute is allowed to be empty; if its not, | |
495 | * it must have a size of at least NLA_HDRLEN. | |
496 | */ | |
497 | if (attrlen == 0) | |
498 | break; | |
499 | if (attrlen < NLA_HDRLEN) | |
500 | goto out_err; | |
47a1494b | 501 | if (pt->nested_policy) { |
1501d135 JB |
502 | int err; |
503 | ||
504 | err = nla_validate_array(nla_data(nla), nla_len(nla), | |
47a1494b | 505 | pt->len, pt->nested_policy, |
7690aa1c | 506 | extack, validate, depth); |
1501d135 JB |
507 | if (err < 0) { |
508 | /* | |
509 | * return directly to preserve the inner | |
510 | * error message/attribute pointer | |
511 | */ | |
512 | return err; | |
513 | } | |
514 | } | |
515 | break; | |
6f455f5f JB |
516 | |
517 | case NLA_UNSPEC: | |
8cb08174 JB |
518 | if (validate & NL_VALIDATE_UNSPEC) { |
519 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
520 | "Unsupported attribute"); | |
521 | return -EINVAL; | |
522 | } | |
6f455f5f JB |
523 | if (attrlen < pt->len) |
524 | goto out_err; | |
525 | break; | |
526 | ||
a5531a5d TG |
527 | default: |
528 | if (pt->len) | |
529 | minlen = pt->len; | |
6f455f5f | 530 | else |
a5531a5d TG |
531 | minlen = nla_attr_minlen[pt->type]; |
532 | ||
533 | if (attrlen < minlen) | |
c29f1845 | 534 | goto out_err; |
a5531a5d | 535 | } |
bfa83a9e | 536 | |
3e48be05 JB |
537 | /* further validation */ |
538 | switch (pt->validation_type) { | |
539 | case NLA_VALIDATE_NONE: | |
540 | /* nothing to do */ | |
541 | break; | |
d06a09b9 | 542 | case NLA_VALIDATE_RANGE_PTR: |
3e48be05 | 543 | case NLA_VALIDATE_RANGE: |
8aa26c57 | 544 | case NLA_VALIDATE_RANGE_WARN_TOO_LONG: |
3e48be05 JB |
545 | case NLA_VALIDATE_MIN: |
546 | case NLA_VALIDATE_MAX: | |
8aa26c57 | 547 | err = nla_validate_int_range(pt, nla, extack, validate); |
3e48be05 JB |
548 | if (err) |
549 | return err; | |
550 | break; | |
bdbb4e29 JK |
551 | case NLA_VALIDATE_MASK: |
552 | err = nla_validate_mask(pt, nla, extack); | |
553 | if (err) | |
554 | return err; | |
555 | break; | |
33188bd6 JB |
556 | case NLA_VALIDATE_FUNCTION: |
557 | if (pt->validate) { | |
558 | err = pt->validate(nla, extack); | |
559 | if (err) | |
560 | return err; | |
561 | } | |
562 | break; | |
3e48be05 JB |
563 | } |
564 | ||
bfa83a9e | 565 | return 0; |
c29f1845 | 566 | out_err: |
44f3625b JB |
567 | NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt, |
568 | "Attribute failed policy validation"); | |
c29f1845 | 569 | return err; |
bfa83a9e TG |
570 | } |
571 | ||
8cb08174 JB |
572 | static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, |
573 | const struct nla_policy *policy, | |
574 | unsigned int validate, | |
575 | struct netlink_ext_ack *extack, | |
7690aa1c | 576 | struct nlattr **tb, unsigned int depth) |
8cb08174 JB |
577 | { |
578 | const struct nlattr *nla; | |
579 | int rem; | |
580 | ||
7690aa1c JB |
581 | if (depth >= MAX_POLICY_RECURSION_DEPTH) { |
582 | NL_SET_ERR_MSG(extack, | |
583 | "allowed policy recursion depth exceeded"); | |
584 | return -EINVAL; | |
585 | } | |
586 | ||
8cb08174 JB |
587 | if (tb) |
588 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
589 | ||
590 | nla_for_each_attr(nla, head, len, rem) { | |
591 | u16 type = nla_type(nla); | |
592 | ||
593 | if (type == 0 || type > maxtype) { | |
594 | if (validate & NL_VALIDATE_MAXTYPE) { | |
d54a16b2 MK |
595 | NL_SET_ERR_MSG_ATTR(extack, nla, |
596 | "Unknown attribute type"); | |
8cb08174 JB |
597 | return -EINVAL; |
598 | } | |
599 | continue; | |
600 | } | |
f0950402 | 601 | type = array_index_nospec(type, maxtype + 1); |
8cb08174 JB |
602 | if (policy) { |
603 | int err = validate_nla(nla, maxtype, policy, | |
7690aa1c | 604 | validate, extack, depth); |
8cb08174 JB |
605 | |
606 | if (err < 0) | |
607 | return err; | |
608 | } | |
609 | ||
610 | if (tb) | |
611 | tb[type] = (struct nlattr *)nla; | |
612 | } | |
613 | ||
614 | if (unlikely(rem > 0)) { | |
615 | pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n", | |
616 | rem, current->comm); | |
617 | NL_SET_ERR_MSG(extack, "bytes leftover after parsing attributes"); | |
618 | if (validate & NL_VALIDATE_TRAILING) | |
619 | return -EINVAL; | |
620 | } | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
bfa83a9e | 625 | /** |
8cb08174 | 626 | * __nla_validate - Validate a stream of attributes |
bfa83a9e TG |
627 | * @head: head of attribute stream |
628 | * @len: length of attribute stream | |
629 | * @maxtype: maximum attribute type to be expected | |
630 | * @policy: validation policy | |
8cb08174 | 631 | * @validate: validation strictness |
fceb6435 | 632 | * @extack: extended ACK report struct |
bfa83a9e TG |
633 | * |
634 | * Validates all attributes in the specified attribute stream against the | |
8cb08174 JB |
635 | * specified policy. Validation depends on the validate flags passed, see |
636 | * &enum netlink_validation for more details on that. | |
9dbbc3b9 | 637 | * See documentation of struct nla_policy for more details. |
bfa83a9e TG |
638 | * |
639 | * Returns 0 on success or a negative error code. | |
640 | */ | |
8cb08174 JB |
641 | int __nla_validate(const struct nlattr *head, int len, int maxtype, |
642 | const struct nla_policy *policy, unsigned int validate, | |
643 | struct netlink_ext_ack *extack) | |
bfa83a9e | 644 | { |
8cb08174 | 645 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 646 | extack, NULL, 0); |
bfa83a9e | 647 | } |
8cb08174 | 648 | EXPORT_SYMBOL(__nla_validate); |
bfa83a9e | 649 | |
e487eb99 | 650 | /** |
9dbbc3b9 | 651 | * nla_policy_len - Determine the max. length of a policy |
8e18be76 | 652 | * @p: policy to use |
e487eb99 HE |
653 | * @n: number of policies |
654 | * | |
655 | * Determines the max. length of the policy. It is currently used | |
656 | * to allocated Netlink buffers roughly the size of the actual | |
657 | * message. | |
658 | * | |
659 | * Returns 0 on success or a negative error code. | |
660 | */ | |
661 | int | |
662 | nla_policy_len(const struct nla_policy *p, int n) | |
663 | { | |
664 | int i, len = 0; | |
665 | ||
e3fa3aff | 666 | for (i = 0; i < n; i++, p++) { |
e487eb99 HE |
667 | if (p->len) |
668 | len += nla_total_size(p->len); | |
28033ae4 DA |
669 | else if (nla_attr_len[p->type]) |
670 | len += nla_total_size(nla_attr_len[p->type]); | |
e487eb99 HE |
671 | else if (nla_attr_minlen[p->type]) |
672 | len += nla_total_size(nla_attr_minlen[p->type]); | |
673 | } | |
674 | ||
675 | return len; | |
676 | } | |
6d6a138f | 677 | EXPORT_SYMBOL(nla_policy_len); |
e487eb99 | 678 | |
bfa83a9e | 679 | /** |
8cb08174 | 680 | * __nla_parse - Parse a stream of attributes into a tb buffer |
bfa83a9e TG |
681 | * @tb: destination array with maxtype+1 elements |
682 | * @maxtype: maximum attribute type to be expected | |
683 | * @head: head of attribute stream | |
684 | * @len: length of attribute stream | |
10b595af | 685 | * @policy: validation policy |
8cb08174 JB |
686 | * @validate: validation strictness |
687 | * @extack: extended ACK pointer | |
bfa83a9e TG |
688 | * |
689 | * Parses a stream of attributes and stores a pointer to each attribute in | |
8cb08174 JB |
690 | * the tb array accessible via the attribute type. |
691 | * Validation is controlled by the @validate parameter. | |
bfa83a9e TG |
692 | * |
693 | * Returns 0 on success or a negative error code. | |
694 | */ | |
8cb08174 JB |
695 | int __nla_parse(struct nlattr **tb, int maxtype, |
696 | const struct nlattr *head, int len, | |
697 | const struct nla_policy *policy, unsigned int validate, | |
698 | struct netlink_ext_ack *extack) | |
a5f6cba2 | 699 | { |
8cb08174 | 700 | return __nla_validate_parse(head, len, maxtype, policy, validate, |
7690aa1c | 701 | extack, tb, 0); |
a5f6cba2 | 702 | } |
8cb08174 | 703 | EXPORT_SYMBOL(__nla_parse); |
a5f6cba2 | 704 | |
bfa83a9e TG |
705 | /** |
706 | * nla_find - Find a specific attribute in a stream of attributes | |
707 | * @head: head of attribute stream | |
708 | * @len: length of attribute stream | |
709 | * @attrtype: type of attribute to look for | |
710 | * | |
711 | * Returns the first attribute in the stream matching the specified type. | |
712 | */ | |
3654654f | 713 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype) |
bfa83a9e | 714 | { |
3654654f | 715 | const struct nlattr *nla; |
bfa83a9e TG |
716 | int rem; |
717 | ||
718 | nla_for_each_attr(nla, head, len, rem) | |
8f4c1f9b | 719 | if (nla_type(nla) == attrtype) |
3654654f | 720 | return (struct nlattr *)nla; |
bfa83a9e TG |
721 | |
722 | return NULL; | |
723 | } | |
6d6a138f | 724 | EXPORT_SYMBOL(nla_find); |
bfa83a9e TG |
725 | |
726 | /** | |
872f6903 | 727 | * nla_strscpy - Copy string attribute payload into a sized buffer |
9ca71874 FL |
728 | * @dst: Where to copy the string to. |
729 | * @nla: Attribute to copy the string from. | |
730 | * @dstsize: Size of destination buffer. | |
bfa83a9e TG |
731 | * |
732 | * Copies at most dstsize - 1 bytes into the destination buffer. | |
9ca71874 | 733 | * Unlike strlcpy the destination buffer is always padded out. |
bfa83a9e | 734 | * |
9ca71874 FL |
735 | * Return: |
736 | * * srclen - Returns @nla length (not including the trailing %NUL). | |
737 | * * -E2BIG - If @dstsize is 0 or greater than U16_MAX or @nla length greater | |
738 | * than @dstsize. | |
bfa83a9e | 739 | */ |
872f6903 | 740 | ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize) |
bfa83a9e TG |
741 | { |
742 | size_t srclen = nla_len(nla); | |
743 | char *src = nla_data(nla); | |
9ca71874 FL |
744 | ssize_t ret; |
745 | size_t len; | |
746 | ||
747 | if (dstsize == 0 || WARN_ON_ONCE(dstsize > U16_MAX)) | |
748 | return -E2BIG; | |
bfa83a9e TG |
749 | |
750 | if (srclen > 0 && src[srclen - 1] == '\0') | |
751 | srclen--; | |
752 | ||
9ca71874 FL |
753 | if (srclen >= dstsize) { |
754 | len = dstsize - 1; | |
755 | ret = -E2BIG; | |
756 | } else { | |
757 | len = srclen; | |
758 | ret = len; | |
bfa83a9e TG |
759 | } |
760 | ||
9ca71874 FL |
761 | memcpy(dst, src, len); |
762 | /* Zero pad end of dst. */ | |
763 | memset(dst + len, 0, dstsize - len); | |
764 | ||
765 | return ret; | |
bfa83a9e | 766 | } |
872f6903 | 767 | EXPORT_SYMBOL(nla_strscpy); |
bfa83a9e | 768 | |
2cf0c8b3 PS |
769 | /** |
770 | * nla_strdup - Copy string attribute payload into a newly allocated buffer | |
771 | * @nla: attribute to copy the string from | |
772 | * @flags: the type of memory to allocate (see kmalloc). | |
773 | * | |
774 | * Returns a pointer to the allocated buffer or NULL on error. | |
775 | */ | |
776 | char *nla_strdup(const struct nlattr *nla, gfp_t flags) | |
777 | { | |
778 | size_t srclen = nla_len(nla); | |
779 | char *src = nla_data(nla), *dst; | |
780 | ||
781 | if (srclen > 0 && src[srclen - 1] == '\0') | |
782 | srclen--; | |
783 | ||
784 | dst = kmalloc(srclen + 1, flags); | |
785 | if (dst != NULL) { | |
786 | memcpy(dst, src, srclen); | |
787 | dst[srclen] = '\0'; | |
788 | } | |
789 | return dst; | |
790 | } | |
791 | EXPORT_SYMBOL(nla_strdup); | |
792 | ||
bfa83a9e TG |
793 | /** |
794 | * nla_memcpy - Copy a netlink attribute into another memory area | |
795 | * @dest: where to copy to memcpy | |
796 | * @src: netlink attribute to copy from | |
797 | * @count: size of the destination area | |
798 | * | |
799 | * Note: The number of bytes copied is limited by the length of | |
800 | * attribute's payload. memcpy | |
801 | * | |
802 | * Returns the number of bytes copied. | |
803 | */ | |
b057efd4 | 804 | int nla_memcpy(void *dest, const struct nlattr *src, int count) |
bfa83a9e TG |
805 | { |
806 | int minlen = min_t(int, count, nla_len(src)); | |
807 | ||
808 | memcpy(dest, nla_data(src), minlen); | |
5899f047 JB |
809 | if (count > minlen) |
810 | memset(dest + minlen, 0, count - minlen); | |
bfa83a9e TG |
811 | |
812 | return minlen; | |
813 | } | |
6d6a138f | 814 | EXPORT_SYMBOL(nla_memcpy); |
bfa83a9e TG |
815 | |
816 | /** | |
817 | * nla_memcmp - Compare an attribute with sized memory area | |
818 | * @nla: netlink attribute | |
819 | * @data: memory area | |
820 | * @size: size of memory area | |
821 | */ | |
822 | int nla_memcmp(const struct nlattr *nla, const void *data, | |
823 | size_t size) | |
824 | { | |
825 | int d = nla_len(nla) - size; | |
826 | ||
827 | if (d == 0) | |
828 | d = memcmp(nla_data(nla), data, size); | |
829 | ||
830 | return d; | |
831 | } | |
6d6a138f | 832 | EXPORT_SYMBOL(nla_memcmp); |
bfa83a9e TG |
833 | |
834 | /** | |
835 | * nla_strcmp - Compare a string attribute against a string | |
836 | * @nla: netlink string attribute | |
837 | * @str: another string | |
838 | */ | |
839 | int nla_strcmp(const struct nlattr *nla, const char *str) | |
840 | { | |
8b7b9324 PN |
841 | int len = strlen(str); |
842 | char *buf = nla_data(nla); | |
843 | int attrlen = nla_len(nla); | |
844 | int d; | |
bfa83a9e | 845 | |
2c16db6c | 846 | while (attrlen > 0 && buf[attrlen - 1] == '\0') |
8b7b9324 PN |
847 | attrlen--; |
848 | ||
849 | d = attrlen - len; | |
bfa83a9e TG |
850 | if (d == 0) |
851 | d = memcmp(nla_data(nla), str, len); | |
852 | ||
853 | return d; | |
854 | } | |
6d6a138f | 855 | EXPORT_SYMBOL(nla_strcmp); |
bfa83a9e | 856 | |
90800216 | 857 | #ifdef CONFIG_NET |
bfa83a9e TG |
858 | /** |
859 | * __nla_reserve - reserve room for attribute on the skb | |
860 | * @skb: socket buffer to reserve room on | |
861 | * @attrtype: attribute type | |
862 | * @attrlen: length of attribute payload | |
863 | * | |
864 | * Adds a netlink attribute header to a socket buffer and reserves | |
865 | * room for the payload but does not copy it. | |
866 | * | |
867 | * The caller is responsible to ensure that the skb provides enough | |
868 | * tailroom for the attribute header and payload. | |
869 | */ | |
870 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
871 | { | |
872 | struct nlattr *nla; | |
873 | ||
4df864c1 | 874 | nla = skb_put(skb, nla_total_size(attrlen)); |
bfa83a9e TG |
875 | nla->nla_type = attrtype; |
876 | nla->nla_len = nla_attr_size(attrlen); | |
877 | ||
878 | memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); | |
879 | ||
880 | return nla; | |
881 | } | |
90800216 | 882 | EXPORT_SYMBOL(__nla_reserve); |
bfa83a9e | 883 | |
089bf1a6 ND |
884 | /** |
885 | * __nla_reserve_64bit - reserve room for attribute on the skb and align it | |
886 | * @skb: socket buffer to reserve room on | |
887 | * @attrtype: attribute type | |
888 | * @attrlen: length of attribute payload | |
11a99573 | 889 | * @padattr: attribute type for the padding |
089bf1a6 ND |
890 | * |
891 | * Adds a netlink attribute header to a socket buffer and reserves | |
892 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 893 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
894 | * |
895 | * The caller is responsible to ensure that the skb provides enough | |
896 | * tailroom for the attribute header and payload. | |
897 | */ | |
898 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, | |
899 | int attrlen, int padattr) | |
900 | { | |
4718a471 | 901 | nla_align_64bit(skb, padattr); |
089bf1a6 ND |
902 | |
903 | return __nla_reserve(skb, attrtype, attrlen); | |
904 | } | |
905 | EXPORT_SYMBOL(__nla_reserve_64bit); | |
906 | ||
fe4944e5 TG |
907 | /** |
908 | * __nla_reserve_nohdr - reserve room for attribute without header | |
909 | * @skb: socket buffer to reserve room on | |
910 | * @attrlen: length of attribute payload | |
911 | * | |
912 | * Reserves room for attribute payload without a header. | |
913 | * | |
914 | * The caller is responsible to ensure that the skb provides enough | |
915 | * tailroom for the payload. | |
916 | */ | |
917 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
918 | { | |
b952f4df | 919 | return skb_put_zero(skb, NLA_ALIGN(attrlen)); |
fe4944e5 | 920 | } |
90800216 | 921 | EXPORT_SYMBOL(__nla_reserve_nohdr); |
fe4944e5 | 922 | |
bfa83a9e TG |
923 | /** |
924 | * nla_reserve - reserve room for attribute on the skb | |
925 | * @skb: socket buffer to reserve room on | |
926 | * @attrtype: attribute type | |
927 | * @attrlen: length of attribute payload | |
928 | * | |
929 | * Adds a netlink attribute header to a socket buffer and reserves | |
930 | * room for the payload but does not copy it. | |
931 | * | |
932 | * Returns NULL if the tailroom of the skb is insufficient to store | |
933 | * the attribute header and payload. | |
934 | */ | |
935 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
936 | { | |
937 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
938 | return NULL; | |
939 | ||
940 | return __nla_reserve(skb, attrtype, attrlen); | |
941 | } | |
90800216 | 942 | EXPORT_SYMBOL(nla_reserve); |
bfa83a9e | 943 | |
089bf1a6 ND |
944 | /** |
945 | * nla_reserve_64bit - reserve room for attribute on the skb and align it | |
946 | * @skb: socket buffer to reserve room on | |
947 | * @attrtype: attribute type | |
948 | * @attrlen: length of attribute payload | |
11a99573 | 949 | * @padattr: attribute type for the padding |
089bf1a6 ND |
950 | * |
951 | * Adds a netlink attribute header to a socket buffer and reserves | |
952 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 953 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
954 | * |
955 | * Returns NULL if the tailroom of the skb is insufficient to store | |
956 | * the attribute header and payload. | |
957 | */ | |
958 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
959 | int padattr) | |
960 | { | |
961 | size_t len; | |
962 | ||
963 | if (nla_need_padding_for_64bit(skb)) | |
964 | len = nla_total_size_64bit(attrlen); | |
965 | else | |
966 | len = nla_total_size(attrlen); | |
967 | if (unlikely(skb_tailroom(skb) < len)) | |
968 | return NULL; | |
969 | ||
970 | return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
971 | } | |
972 | EXPORT_SYMBOL(nla_reserve_64bit); | |
973 | ||
fe4944e5 | 974 | /** |
10b595af | 975 | * nla_reserve_nohdr - reserve room for attribute without header |
fe4944e5 | 976 | * @skb: socket buffer to reserve room on |
10b595af | 977 | * @attrlen: length of attribute payload |
fe4944e5 TG |
978 | * |
979 | * Reserves room for attribute payload without a header. | |
980 | * | |
981 | * Returns NULL if the tailroom of the skb is insufficient to store | |
982 | * the attribute payload. | |
983 | */ | |
984 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
985 | { | |
986 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
987 | return NULL; | |
988 | ||
989 | return __nla_reserve_nohdr(skb, attrlen); | |
990 | } | |
90800216 | 991 | EXPORT_SYMBOL(nla_reserve_nohdr); |
fe4944e5 | 992 | |
bfa83a9e TG |
993 | /** |
994 | * __nla_put - Add a netlink attribute to a socket buffer | |
995 | * @skb: socket buffer to add attribute to | |
996 | * @attrtype: attribute type | |
997 | * @attrlen: length of attribute payload | |
998 | * @data: head of attribute payload | |
999 | * | |
1000 | * The caller is responsible to ensure that the skb provides enough | |
1001 | * tailroom for the attribute header and payload. | |
1002 | */ | |
1003 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
1004 | const void *data) | |
1005 | { | |
1006 | struct nlattr *nla; | |
1007 | ||
1008 | nla = __nla_reserve(skb, attrtype, attrlen); | |
1009 | memcpy(nla_data(nla), data, attrlen); | |
1010 | } | |
90800216 | 1011 | EXPORT_SYMBOL(__nla_put); |
bfa83a9e | 1012 | |
089bf1a6 ND |
1013 | /** |
1014 | * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
1015 | * @skb: socket buffer to add attribute to | |
1016 | * @attrtype: attribute type | |
1017 | * @attrlen: length of attribute payload | |
1018 | * @data: head of attribute payload | |
11a99573 | 1019 | * @padattr: attribute type for the padding |
089bf1a6 ND |
1020 | * |
1021 | * The caller is responsible to ensure that the skb provides enough | |
1022 | * tailroom for the attribute header and payload. | |
1023 | */ | |
1024 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
1025 | const void *data, int padattr) | |
1026 | { | |
1027 | struct nlattr *nla; | |
1028 | ||
1029 | nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
1030 | memcpy(nla_data(nla), data, attrlen); | |
1031 | } | |
1032 | EXPORT_SYMBOL(__nla_put_64bit); | |
1033 | ||
fe4944e5 TG |
1034 | /** |
1035 | * __nla_put_nohdr - Add a netlink attribute without header | |
1036 | * @skb: socket buffer to add attribute to | |
1037 | * @attrlen: length of attribute payload | |
1038 | * @data: head of attribute payload | |
1039 | * | |
1040 | * The caller is responsible to ensure that the skb provides enough | |
1041 | * tailroom for the attribute payload. | |
1042 | */ | |
1043 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1044 | { | |
1045 | void *start; | |
1046 | ||
1047 | start = __nla_reserve_nohdr(skb, attrlen); | |
1048 | memcpy(start, data, attrlen); | |
1049 | } | |
90800216 | 1050 | EXPORT_SYMBOL(__nla_put_nohdr); |
bfa83a9e TG |
1051 | |
1052 | /** | |
1053 | * nla_put - Add a netlink attribute to a socket buffer | |
1054 | * @skb: socket buffer to add attribute to | |
1055 | * @attrtype: attribute type | |
1056 | * @attrlen: length of attribute payload | |
1057 | * @data: head of attribute payload | |
1058 | * | |
bc3ed28c | 1059 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
bfa83a9e TG |
1060 | * the attribute header and payload. |
1061 | */ | |
1062 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
1063 | { | |
1064 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
bc3ed28c | 1065 | return -EMSGSIZE; |
bfa83a9e TG |
1066 | |
1067 | __nla_put(skb, attrtype, attrlen, data); | |
1068 | return 0; | |
1069 | } | |
90800216 | 1070 | EXPORT_SYMBOL(nla_put); |
bfa83a9e | 1071 | |
089bf1a6 ND |
1072 | /** |
1073 | * nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
1074 | * @skb: socket buffer to add attribute to | |
1075 | * @attrtype: attribute type | |
1076 | * @attrlen: length of attribute payload | |
1077 | * @data: head of attribute payload | |
11a99573 | 1078 | * @padattr: attribute type for the padding |
089bf1a6 ND |
1079 | * |
1080 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store | |
1081 | * the attribute header and payload. | |
1082 | */ | |
1083 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
1084 | const void *data, int padattr) | |
1085 | { | |
1086 | size_t len; | |
1087 | ||
1088 | if (nla_need_padding_for_64bit(skb)) | |
1089 | len = nla_total_size_64bit(attrlen); | |
1090 | else | |
1091 | len = nla_total_size(attrlen); | |
1092 | if (unlikely(skb_tailroom(skb) < len)) | |
1093 | return -EMSGSIZE; | |
1094 | ||
1095 | __nla_put_64bit(skb, attrtype, attrlen, data, padattr); | |
1096 | return 0; | |
1097 | } | |
1098 | EXPORT_SYMBOL(nla_put_64bit); | |
1099 | ||
fe4944e5 TG |
1100 | /** |
1101 | * nla_put_nohdr - Add a netlink attribute without header | |
1102 | * @skb: socket buffer to add attribute to | |
1103 | * @attrlen: length of attribute payload | |
1104 | * @data: head of attribute payload | |
1105 | * | |
bc3ed28c | 1106 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
fe4944e5 TG |
1107 | * the attribute payload. |
1108 | */ | |
1109 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
1110 | { | |
1111 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1112 | return -EMSGSIZE; |
fe4944e5 TG |
1113 | |
1114 | __nla_put_nohdr(skb, attrlen, data); | |
1115 | return 0; | |
1116 | } | |
90800216 | 1117 | EXPORT_SYMBOL(nla_put_nohdr); |
bfa83a9e | 1118 | |
01480e1c PM |
1119 | /** |
1120 | * nla_append - Add a netlink attribute without header or padding | |
1121 | * @skb: socket buffer to add attribute to | |
1122 | * @attrlen: length of attribute payload | |
1123 | * @data: head of attribute payload | |
1124 | * | |
bc3ed28c | 1125 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
01480e1c PM |
1126 | * the attribute payload. |
1127 | */ | |
1128 | int nla_append(struct sk_buff *skb, int attrlen, const void *data) | |
1129 | { | |
1130 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 1131 | return -EMSGSIZE; |
01480e1c | 1132 | |
59ae1d12 | 1133 | skb_put_data(skb, data, attrlen); |
01480e1c PM |
1134 | return 0; |
1135 | } | |
90800216 HX |
1136 | EXPORT_SYMBOL(nla_append); |
1137 | #endif |