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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 | ||
28033ae4 DA |
18 | /* for these data types attribute length must be exactly given size */ |
19 | static const u8 nla_attr_len[NLA_TYPE_MAX+1] = { | |
bfa83a9e TG |
20 | [NLA_U8] = sizeof(u8), |
21 | [NLA_U16] = sizeof(u16), | |
22 | [NLA_U32] = sizeof(u32), | |
23 | [NLA_U64] = sizeof(u64), | |
9eca2eb9 JA |
24 | [NLA_S8] = sizeof(s8), |
25 | [NLA_S16] = sizeof(s16), | |
26 | [NLA_S32] = sizeof(s32), | |
27 | [NLA_S64] = sizeof(s64), | |
bfa83a9e TG |
28 | }; |
29 | ||
28033ae4 DA |
30 | static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = { |
31 | [NLA_MSECS] = sizeof(u64), | |
32 | [NLA_NESTED] = NLA_HDRLEN, | |
33 | }; | |
34 | ||
64c83d83 JHS |
35 | static int validate_nla_bitfield32(const struct nlattr *nla, |
36 | u32 *valid_flags_allowed) | |
37 | { | |
38 | const struct nla_bitfield32 *bf = nla_data(nla); | |
39 | u32 *valid_flags_mask = valid_flags_allowed; | |
40 | ||
41 | if (!valid_flags_allowed) | |
42 | return -EINVAL; | |
43 | ||
44 | /*disallow invalid bit selector */ | |
45 | if (bf->selector & ~*valid_flags_mask) | |
46 | return -EINVAL; | |
47 | ||
48 | /*disallow invalid bit values */ | |
49 | if (bf->value & ~*valid_flags_mask) | |
50 | return -EINVAL; | |
51 | ||
52 | /*disallow valid bit values that are not selected*/ | |
53 | if (bf->value & ~bf->selector) | |
54 | return -EINVAL; | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
3654654f | 59 | static int validate_nla(const struct nlattr *nla, int maxtype, |
ef7c79ed | 60 | const struct nla_policy *policy) |
bfa83a9e | 61 | { |
ef7c79ed | 62 | const struct nla_policy *pt; |
8f4c1f9b | 63 | int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla); |
bfa83a9e | 64 | |
8f4c1f9b | 65 | if (type <= 0 || type > maxtype) |
bfa83a9e TG |
66 | return 0; |
67 | ||
8f4c1f9b | 68 | pt = &policy[type]; |
bfa83a9e TG |
69 | |
70 | BUG_ON(pt->type > NLA_TYPE_MAX); | |
71 | ||
28033ae4 DA |
72 | /* for data types NLA_U* and NLA_S* require exact length */ |
73 | if (nla_attr_len[pt->type]) { | |
74 | if (attrlen != nla_attr_len[pt->type]) | |
75 | return -ERANGE; | |
76 | return 0; | |
77 | } | |
78 | ||
a5531a5d TG |
79 | switch (pt->type) { |
80 | case NLA_FLAG: | |
81 | if (attrlen > 0) | |
82 | return -ERANGE; | |
83 | break; | |
bfa83a9e | 84 | |
64c83d83 JHS |
85 | case NLA_BITFIELD32: |
86 | if (attrlen != sizeof(struct nla_bitfield32)) | |
87 | return -ERANGE; | |
88 | ||
89 | return validate_nla_bitfield32(nla, pt->validation_data); | |
90 | ||
a5531a5d TG |
91 | case NLA_NUL_STRING: |
92 | if (pt->len) | |
93 | minlen = min_t(int, attrlen, pt->len + 1); | |
94 | else | |
95 | minlen = attrlen; | |
bfa83a9e | 96 | |
a5531a5d TG |
97 | if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) |
98 | return -EINVAL; | |
99 | /* fall through */ | |
100 | ||
101 | case NLA_STRING: | |
102 | if (attrlen < 1) | |
103 | return -ERANGE; | |
104 | ||
105 | if (pt->len) { | |
106 | char *buf = nla_data(nla); | |
107 | ||
108 | if (buf[attrlen - 1] == '\0') | |
109 | attrlen--; | |
110 | ||
111 | if (attrlen > pt->len) | |
112 | return -ERANGE; | |
113 | } | |
114 | break; | |
115 | ||
d30045a0 JB |
116 | case NLA_BINARY: |
117 | if (pt->len && attrlen > pt->len) | |
118 | return -ERANGE; | |
119 | break; | |
120 | ||
1092cb21 PM |
121 | case NLA_NESTED_COMPAT: |
122 | if (attrlen < pt->len) | |
123 | return -ERANGE; | |
124 | if (attrlen < NLA_ALIGN(pt->len)) | |
125 | break; | |
126 | if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN) | |
127 | return -ERANGE; | |
128 | nla = nla_data(nla) + NLA_ALIGN(pt->len); | |
129 | if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN + nla_len(nla)) | |
130 | return -ERANGE; | |
131 | break; | |
ea5693cc PM |
132 | case NLA_NESTED: |
133 | /* a nested attributes is allowed to be empty; if its not, | |
134 | * it must have a size of at least NLA_HDRLEN. | |
135 | */ | |
136 | if (attrlen == 0) | |
137 | break; | |
a5531a5d TG |
138 | default: |
139 | if (pt->len) | |
140 | minlen = pt->len; | |
141 | else if (pt->type != NLA_UNSPEC) | |
142 | minlen = nla_attr_minlen[pt->type]; | |
143 | ||
144 | if (attrlen < minlen) | |
145 | return -ERANGE; | |
146 | } | |
bfa83a9e TG |
147 | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /** | |
152 | * nla_validate - Validate a stream of attributes | |
153 | * @head: head of attribute stream | |
154 | * @len: length of attribute stream | |
155 | * @maxtype: maximum attribute type to be expected | |
156 | * @policy: validation policy | |
fceb6435 | 157 | * @extack: extended ACK report struct |
bfa83a9e TG |
158 | * |
159 | * Validates all attributes in the specified attribute stream against the | |
160 | * specified policy. Attributes with a type exceeding maxtype will be | |
161 | * ignored. See documenation of struct nla_policy for more details. | |
162 | * | |
163 | * Returns 0 on success or a negative error code. | |
164 | */ | |
3654654f | 165 | int nla_validate(const struct nlattr *head, int len, int maxtype, |
fceb6435 JB |
166 | const struct nla_policy *policy, |
167 | struct netlink_ext_ack *extack) | |
bfa83a9e | 168 | { |
3654654f | 169 | const struct nlattr *nla; |
fceb6435 | 170 | int rem; |
bfa83a9e TG |
171 | |
172 | nla_for_each_attr(nla, head, len, rem) { | |
fceb6435 JB |
173 | int err = validate_nla(nla, maxtype, policy); |
174 | ||
175 | if (err < 0) { | |
176 | if (extack) | |
177 | extack->bad_attr = nla; | |
178 | return err; | |
179 | } | |
bfa83a9e TG |
180 | } |
181 | ||
fceb6435 | 182 | return 0; |
bfa83a9e | 183 | } |
6d6a138f | 184 | EXPORT_SYMBOL(nla_validate); |
bfa83a9e | 185 | |
e487eb99 HE |
186 | /** |
187 | * nla_policy_len - Determin the max. length of a policy | |
188 | * @policy: policy to use | |
189 | * @n: number of policies | |
190 | * | |
191 | * Determines the max. length of the policy. It is currently used | |
192 | * to allocated Netlink buffers roughly the size of the actual | |
193 | * message. | |
194 | * | |
195 | * Returns 0 on success or a negative error code. | |
196 | */ | |
197 | int | |
198 | nla_policy_len(const struct nla_policy *p, int n) | |
199 | { | |
200 | int i, len = 0; | |
201 | ||
e3fa3aff | 202 | for (i = 0; i < n; i++, p++) { |
e487eb99 HE |
203 | if (p->len) |
204 | len += nla_total_size(p->len); | |
28033ae4 DA |
205 | else if (nla_attr_len[p->type]) |
206 | len += nla_total_size(nla_attr_len[p->type]); | |
e487eb99 HE |
207 | else if (nla_attr_minlen[p->type]) |
208 | len += nla_total_size(nla_attr_minlen[p->type]); | |
209 | } | |
210 | ||
211 | return len; | |
212 | } | |
6d6a138f | 213 | EXPORT_SYMBOL(nla_policy_len); |
e487eb99 | 214 | |
bfa83a9e TG |
215 | /** |
216 | * nla_parse - Parse a stream of attributes into a tb buffer | |
217 | * @tb: destination array with maxtype+1 elements | |
218 | * @maxtype: maximum attribute type to be expected | |
219 | * @head: head of attribute stream | |
220 | * @len: length of attribute stream | |
10b595af | 221 | * @policy: validation policy |
bfa83a9e TG |
222 | * |
223 | * Parses a stream of attributes and stores a pointer to each attribute in | |
b595076a | 224 | * the tb array accessible via the attribute type. Attributes with a type |
bfa83a9e TG |
225 | * exceeding maxtype will be silently ignored for backwards compatibility |
226 | * reasons. policy may be set to NULL if no validation is required. | |
227 | * | |
228 | * Returns 0 on success or a negative error code. | |
229 | */ | |
3654654f | 230 | int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, |
fceb6435 JB |
231 | int len, const struct nla_policy *policy, |
232 | struct netlink_ext_ack *extack) | |
bfa83a9e | 233 | { |
3654654f | 234 | const struct nlattr *nla; |
bfa83a9e TG |
235 | int rem, err; |
236 | ||
237 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); | |
238 | ||
239 | nla_for_each_attr(nla, head, len, rem) { | |
8f4c1f9b | 240 | u16 type = nla_type(nla); |
bfa83a9e TG |
241 | |
242 | if (type > 0 && type <= maxtype) { | |
243 | if (policy) { | |
244 | err = validate_nla(nla, maxtype, policy); | |
fceb6435 JB |
245 | if (err < 0) { |
246 | if (extack) | |
247 | extack->bad_attr = nla; | |
bfa83a9e | 248 | goto errout; |
fceb6435 | 249 | } |
bfa83a9e TG |
250 | } |
251 | ||
3654654f | 252 | tb[type] = (struct nlattr *)nla; |
bfa83a9e TG |
253 | } |
254 | } | |
255 | ||
256 | if (unlikely(rem > 0)) | |
bfc5184b MS |
257 | pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n", |
258 | rem, current->comm); | |
bfa83a9e TG |
259 | |
260 | err = 0; | |
261 | errout: | |
262 | return err; | |
263 | } | |
6d6a138f | 264 | EXPORT_SYMBOL(nla_parse); |
bfa83a9e TG |
265 | |
266 | /** | |
267 | * nla_find - Find a specific attribute in a stream of attributes | |
268 | * @head: head of attribute stream | |
269 | * @len: length of attribute stream | |
270 | * @attrtype: type of attribute to look for | |
271 | * | |
272 | * Returns the first attribute in the stream matching the specified type. | |
273 | */ | |
3654654f | 274 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype) |
bfa83a9e | 275 | { |
3654654f | 276 | const struct nlattr *nla; |
bfa83a9e TG |
277 | int rem; |
278 | ||
279 | nla_for_each_attr(nla, head, len, rem) | |
8f4c1f9b | 280 | if (nla_type(nla) == attrtype) |
3654654f | 281 | return (struct nlattr *)nla; |
bfa83a9e TG |
282 | |
283 | return NULL; | |
284 | } | |
6d6a138f | 285 | EXPORT_SYMBOL(nla_find); |
bfa83a9e TG |
286 | |
287 | /** | |
288 | * nla_strlcpy - Copy string attribute payload into a sized buffer | |
289 | * @dst: where to copy the string to | |
10b595af | 290 | * @nla: attribute to copy the string from |
bfa83a9e TG |
291 | * @dstsize: size of destination buffer |
292 | * | |
293 | * Copies at most dstsize - 1 bytes into the destination buffer. | |
294 | * The result is always a valid NUL-terminated string. Unlike | |
295 | * strlcpy the destination buffer is always padded out. | |
296 | * | |
297 | * Returns the length of the source buffer. | |
298 | */ | |
299 | size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize) | |
300 | { | |
301 | size_t srclen = nla_len(nla); | |
302 | char *src = nla_data(nla); | |
303 | ||
304 | if (srclen > 0 && src[srclen - 1] == '\0') | |
305 | srclen--; | |
306 | ||
307 | if (dstsize > 0) { | |
308 | size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen; | |
309 | ||
310 | memset(dst, 0, dstsize); | |
311 | memcpy(dst, src, len); | |
312 | } | |
313 | ||
314 | return srclen; | |
315 | } | |
6d6a138f | 316 | EXPORT_SYMBOL(nla_strlcpy); |
bfa83a9e | 317 | |
2cf0c8b3 PS |
318 | /** |
319 | * nla_strdup - Copy string attribute payload into a newly allocated buffer | |
320 | * @nla: attribute to copy the string from | |
321 | * @flags: the type of memory to allocate (see kmalloc). | |
322 | * | |
323 | * Returns a pointer to the allocated buffer or NULL on error. | |
324 | */ | |
325 | char *nla_strdup(const struct nlattr *nla, gfp_t flags) | |
326 | { | |
327 | size_t srclen = nla_len(nla); | |
328 | char *src = nla_data(nla), *dst; | |
329 | ||
330 | if (srclen > 0 && src[srclen - 1] == '\0') | |
331 | srclen--; | |
332 | ||
333 | dst = kmalloc(srclen + 1, flags); | |
334 | if (dst != NULL) { | |
335 | memcpy(dst, src, srclen); | |
336 | dst[srclen] = '\0'; | |
337 | } | |
338 | return dst; | |
339 | } | |
340 | EXPORT_SYMBOL(nla_strdup); | |
341 | ||
bfa83a9e TG |
342 | /** |
343 | * nla_memcpy - Copy a netlink attribute into another memory area | |
344 | * @dest: where to copy to memcpy | |
345 | * @src: netlink attribute to copy from | |
346 | * @count: size of the destination area | |
347 | * | |
348 | * Note: The number of bytes copied is limited by the length of | |
349 | * attribute's payload. memcpy | |
350 | * | |
351 | * Returns the number of bytes copied. | |
352 | */ | |
b057efd4 | 353 | int nla_memcpy(void *dest, const struct nlattr *src, int count) |
bfa83a9e TG |
354 | { |
355 | int minlen = min_t(int, count, nla_len(src)); | |
356 | ||
357 | memcpy(dest, nla_data(src), minlen); | |
5899f047 JB |
358 | if (count > minlen) |
359 | memset(dest + minlen, 0, count - minlen); | |
bfa83a9e TG |
360 | |
361 | return minlen; | |
362 | } | |
6d6a138f | 363 | EXPORT_SYMBOL(nla_memcpy); |
bfa83a9e TG |
364 | |
365 | /** | |
366 | * nla_memcmp - Compare an attribute with sized memory area | |
367 | * @nla: netlink attribute | |
368 | * @data: memory area | |
369 | * @size: size of memory area | |
370 | */ | |
371 | int nla_memcmp(const struct nlattr *nla, const void *data, | |
372 | size_t size) | |
373 | { | |
374 | int d = nla_len(nla) - size; | |
375 | ||
376 | if (d == 0) | |
377 | d = memcmp(nla_data(nla), data, size); | |
378 | ||
379 | return d; | |
380 | } | |
6d6a138f | 381 | EXPORT_SYMBOL(nla_memcmp); |
bfa83a9e TG |
382 | |
383 | /** | |
384 | * nla_strcmp - Compare a string attribute against a string | |
385 | * @nla: netlink string attribute | |
386 | * @str: another string | |
387 | */ | |
388 | int nla_strcmp(const struct nlattr *nla, const char *str) | |
389 | { | |
8b7b9324 PN |
390 | int len = strlen(str); |
391 | char *buf = nla_data(nla); | |
392 | int attrlen = nla_len(nla); | |
393 | int d; | |
bfa83a9e | 394 | |
8b7b9324 PN |
395 | if (attrlen > 0 && buf[attrlen - 1] == '\0') |
396 | attrlen--; | |
397 | ||
398 | d = attrlen - len; | |
bfa83a9e TG |
399 | if (d == 0) |
400 | d = memcmp(nla_data(nla), str, len); | |
401 | ||
402 | return d; | |
403 | } | |
6d6a138f | 404 | EXPORT_SYMBOL(nla_strcmp); |
bfa83a9e | 405 | |
90800216 | 406 | #ifdef CONFIG_NET |
bfa83a9e TG |
407 | /** |
408 | * __nla_reserve - reserve room for attribute on the skb | |
409 | * @skb: socket buffer to reserve room on | |
410 | * @attrtype: attribute type | |
411 | * @attrlen: length of attribute payload | |
412 | * | |
413 | * Adds a netlink attribute header to a socket buffer and reserves | |
414 | * room for the payload but does not copy it. | |
415 | * | |
416 | * The caller is responsible to ensure that the skb provides enough | |
417 | * tailroom for the attribute header and payload. | |
418 | */ | |
419 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
420 | { | |
421 | struct nlattr *nla; | |
422 | ||
4df864c1 | 423 | nla = skb_put(skb, nla_total_size(attrlen)); |
bfa83a9e TG |
424 | nla->nla_type = attrtype; |
425 | nla->nla_len = nla_attr_size(attrlen); | |
426 | ||
427 | memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen)); | |
428 | ||
429 | return nla; | |
430 | } | |
90800216 | 431 | EXPORT_SYMBOL(__nla_reserve); |
bfa83a9e | 432 | |
089bf1a6 ND |
433 | /** |
434 | * __nla_reserve_64bit - reserve room for attribute on the skb and align it | |
435 | * @skb: socket buffer to reserve room on | |
436 | * @attrtype: attribute type | |
437 | * @attrlen: length of attribute payload | |
11a99573 | 438 | * @padattr: attribute type for the padding |
089bf1a6 ND |
439 | * |
440 | * Adds a netlink attribute header to a socket buffer and reserves | |
441 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 442 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
443 | * |
444 | * The caller is responsible to ensure that the skb provides enough | |
445 | * tailroom for the attribute header and payload. | |
446 | */ | |
447 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, | |
448 | int attrlen, int padattr) | |
449 | { | |
450 | if (nla_need_padding_for_64bit(skb)) | |
451 | nla_align_64bit(skb, padattr); | |
452 | ||
453 | return __nla_reserve(skb, attrtype, attrlen); | |
454 | } | |
455 | EXPORT_SYMBOL(__nla_reserve_64bit); | |
456 | ||
fe4944e5 TG |
457 | /** |
458 | * __nla_reserve_nohdr - reserve room for attribute without header | |
459 | * @skb: socket buffer to reserve room on | |
460 | * @attrlen: length of attribute payload | |
461 | * | |
462 | * Reserves room for attribute payload without a header. | |
463 | * | |
464 | * The caller is responsible to ensure that the skb provides enough | |
465 | * tailroom for the payload. | |
466 | */ | |
467 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
468 | { | |
b952f4df | 469 | return skb_put_zero(skb, NLA_ALIGN(attrlen)); |
fe4944e5 | 470 | } |
90800216 | 471 | EXPORT_SYMBOL(__nla_reserve_nohdr); |
fe4944e5 | 472 | |
bfa83a9e TG |
473 | /** |
474 | * nla_reserve - reserve room for attribute on the skb | |
475 | * @skb: socket buffer to reserve room on | |
476 | * @attrtype: attribute type | |
477 | * @attrlen: length of attribute payload | |
478 | * | |
479 | * Adds a netlink attribute header to a socket buffer and reserves | |
480 | * room for the payload but does not copy it. | |
481 | * | |
482 | * Returns NULL if the tailroom of the skb is insufficient to store | |
483 | * the attribute header and payload. | |
484 | */ | |
485 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen) | |
486 | { | |
487 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
488 | return NULL; | |
489 | ||
490 | return __nla_reserve(skb, attrtype, attrlen); | |
491 | } | |
90800216 | 492 | EXPORT_SYMBOL(nla_reserve); |
bfa83a9e | 493 | |
089bf1a6 ND |
494 | /** |
495 | * nla_reserve_64bit - reserve room for attribute on the skb and align it | |
496 | * @skb: socket buffer to reserve room on | |
497 | * @attrtype: attribute type | |
498 | * @attrlen: length of attribute payload | |
11a99573 | 499 | * @padattr: attribute type for the padding |
089bf1a6 ND |
500 | * |
501 | * Adds a netlink attribute header to a socket buffer and reserves | |
502 | * room for the payload but does not copy it. It also ensure that this | |
11a99573 | 503 | * attribute will have a 64-bit aligned nla_data() area. |
089bf1a6 ND |
504 | * |
505 | * Returns NULL if the tailroom of the skb is insufficient to store | |
506 | * the attribute header and payload. | |
507 | */ | |
508 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
509 | int padattr) | |
510 | { | |
511 | size_t len; | |
512 | ||
513 | if (nla_need_padding_for_64bit(skb)) | |
514 | len = nla_total_size_64bit(attrlen); | |
515 | else | |
516 | len = nla_total_size(attrlen); | |
517 | if (unlikely(skb_tailroom(skb) < len)) | |
518 | return NULL; | |
519 | ||
520 | return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
521 | } | |
522 | EXPORT_SYMBOL(nla_reserve_64bit); | |
523 | ||
fe4944e5 | 524 | /** |
10b595af | 525 | * nla_reserve_nohdr - reserve room for attribute without header |
fe4944e5 | 526 | * @skb: socket buffer to reserve room on |
10b595af | 527 | * @attrlen: length of attribute payload |
fe4944e5 TG |
528 | * |
529 | * Reserves room for attribute payload without a header. | |
530 | * | |
531 | * Returns NULL if the tailroom of the skb is insufficient to store | |
532 | * the attribute payload. | |
533 | */ | |
534 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen) | |
535 | { | |
536 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
537 | return NULL; | |
538 | ||
539 | return __nla_reserve_nohdr(skb, attrlen); | |
540 | } | |
90800216 | 541 | EXPORT_SYMBOL(nla_reserve_nohdr); |
fe4944e5 | 542 | |
bfa83a9e TG |
543 | /** |
544 | * __nla_put - Add a netlink attribute to a socket buffer | |
545 | * @skb: socket buffer to add attribute to | |
546 | * @attrtype: attribute type | |
547 | * @attrlen: length of attribute payload | |
548 | * @data: head of attribute payload | |
549 | * | |
550 | * The caller is responsible to ensure that the skb provides enough | |
551 | * tailroom for the attribute header and payload. | |
552 | */ | |
553 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
554 | const void *data) | |
555 | { | |
556 | struct nlattr *nla; | |
557 | ||
558 | nla = __nla_reserve(skb, attrtype, attrlen); | |
559 | memcpy(nla_data(nla), data, attrlen); | |
560 | } | |
90800216 | 561 | EXPORT_SYMBOL(__nla_put); |
bfa83a9e | 562 | |
089bf1a6 ND |
563 | /** |
564 | * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
565 | * @skb: socket buffer to add attribute to | |
566 | * @attrtype: attribute type | |
567 | * @attrlen: length of attribute payload | |
568 | * @data: head of attribute payload | |
11a99573 | 569 | * @padattr: attribute type for the padding |
089bf1a6 ND |
570 | * |
571 | * The caller is responsible to ensure that the skb provides enough | |
572 | * tailroom for the attribute header and payload. | |
573 | */ | |
574 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
575 | const void *data, int padattr) | |
576 | { | |
577 | struct nlattr *nla; | |
578 | ||
579 | nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); | |
580 | memcpy(nla_data(nla), data, attrlen); | |
581 | } | |
582 | EXPORT_SYMBOL(__nla_put_64bit); | |
583 | ||
fe4944e5 TG |
584 | /** |
585 | * __nla_put_nohdr - Add a netlink attribute without header | |
586 | * @skb: socket buffer to add attribute to | |
587 | * @attrlen: length of attribute payload | |
588 | * @data: head of attribute payload | |
589 | * | |
590 | * The caller is responsible to ensure that the skb provides enough | |
591 | * tailroom for the attribute payload. | |
592 | */ | |
593 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
594 | { | |
595 | void *start; | |
596 | ||
597 | start = __nla_reserve_nohdr(skb, attrlen); | |
598 | memcpy(start, data, attrlen); | |
599 | } | |
90800216 | 600 | EXPORT_SYMBOL(__nla_put_nohdr); |
bfa83a9e TG |
601 | |
602 | /** | |
603 | * nla_put - Add a netlink attribute to a socket buffer | |
604 | * @skb: socket buffer to add attribute to | |
605 | * @attrtype: attribute type | |
606 | * @attrlen: length of attribute payload | |
607 | * @data: head of attribute payload | |
608 | * | |
bc3ed28c | 609 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
bfa83a9e TG |
610 | * the attribute header and payload. |
611 | */ | |
612 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data) | |
613 | { | |
614 | if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen))) | |
bc3ed28c | 615 | return -EMSGSIZE; |
bfa83a9e TG |
616 | |
617 | __nla_put(skb, attrtype, attrlen, data); | |
618 | return 0; | |
619 | } | |
90800216 | 620 | EXPORT_SYMBOL(nla_put); |
bfa83a9e | 621 | |
089bf1a6 ND |
622 | /** |
623 | * nla_put_64bit - Add a netlink attribute to a socket buffer and align it | |
624 | * @skb: socket buffer to add attribute to | |
625 | * @attrtype: attribute type | |
626 | * @attrlen: length of attribute payload | |
627 | * @data: head of attribute payload | |
11a99573 | 628 | * @padattr: attribute type for the padding |
089bf1a6 ND |
629 | * |
630 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store | |
631 | * the attribute header and payload. | |
632 | */ | |
633 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, | |
634 | const void *data, int padattr) | |
635 | { | |
636 | size_t len; | |
637 | ||
638 | if (nla_need_padding_for_64bit(skb)) | |
639 | len = nla_total_size_64bit(attrlen); | |
640 | else | |
641 | len = nla_total_size(attrlen); | |
642 | if (unlikely(skb_tailroom(skb) < len)) | |
643 | return -EMSGSIZE; | |
644 | ||
645 | __nla_put_64bit(skb, attrtype, attrlen, data, padattr); | |
646 | return 0; | |
647 | } | |
648 | EXPORT_SYMBOL(nla_put_64bit); | |
649 | ||
fe4944e5 TG |
650 | /** |
651 | * nla_put_nohdr - Add a netlink attribute without header | |
652 | * @skb: socket buffer to add attribute to | |
653 | * @attrlen: length of attribute payload | |
654 | * @data: head of attribute payload | |
655 | * | |
bc3ed28c | 656 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
fe4944e5 TG |
657 | * the attribute payload. |
658 | */ | |
659 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data) | |
660 | { | |
661 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 662 | return -EMSGSIZE; |
fe4944e5 TG |
663 | |
664 | __nla_put_nohdr(skb, attrlen, data); | |
665 | return 0; | |
666 | } | |
90800216 | 667 | EXPORT_SYMBOL(nla_put_nohdr); |
bfa83a9e | 668 | |
01480e1c PM |
669 | /** |
670 | * nla_append - Add a netlink attribute without header or padding | |
671 | * @skb: socket buffer to add attribute to | |
672 | * @attrlen: length of attribute payload | |
673 | * @data: head of attribute payload | |
674 | * | |
bc3ed28c | 675 | * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store |
01480e1c PM |
676 | * the attribute payload. |
677 | */ | |
678 | int nla_append(struct sk_buff *skb, int attrlen, const void *data) | |
679 | { | |
680 | if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen))) | |
bc3ed28c | 681 | return -EMSGSIZE; |
01480e1c | 682 | |
59ae1d12 | 683 | skb_put_data(skb, data, attrlen); |
01480e1c PM |
684 | return 0; |
685 | } | |
90800216 HX |
686 | EXPORT_SYMBOL(nla_append); |
687 | #endif |