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bfa83a9e TG |
1 | #ifndef __NET_NETLINK_H |
2 | #define __NET_NETLINK_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/netlink.h> | |
d7fe0f24 | 6 | #include <linux/jiffies.h> |
930345ea | 7 | #include <linux/in6.h> |
bfa83a9e TG |
8 | |
9 | /* ======================================================================== | |
10 | * Netlink Messages and Attributes Interface (As Seen On TV) | |
11 | * ------------------------------------------------------------------------ | |
12 | * Messages Interface | |
13 | * ------------------------------------------------------------------------ | |
14 | * | |
15 | * Message Format: | |
16 | * <--- nlmsg_total_size(payload) ---> | |
17 | * <-- nlmsg_msg_size(payload) -> | |
18 | * +----------+- - -+-------------+- - -+-------- - - | |
19 | * | nlmsghdr | Pad | Payload | Pad | nlmsghdr | |
20 | * +----------+- - -+-------------+- - -+-------- - - | |
21 | * nlmsg_data(nlh)---^ ^ | |
22 | * nlmsg_next(nlh)-----------------------+ | |
23 | * | |
24 | * Payload Format: | |
25 | * <---------------------- nlmsg_len(nlh) ---------------------> | |
26 | * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) -> | |
27 | * +----------------------+- - -+--------------------------------+ | |
28 | * | Family Header | Pad | Attributes | | |
29 | * +----------------------+- - -+--------------------------------+ | |
30 | * nlmsg_attrdata(nlh, hdrlen)---^ | |
31 | * | |
32 | * Data Structures: | |
33 | * struct nlmsghdr netlink message header | |
34 | * | |
35 | * Message Construction: | |
36 | * nlmsg_new() create a new netlink message | |
37 | * nlmsg_put() add a netlink message to an skb | |
38 | * nlmsg_put_answer() callback based nlmsg_put() | |
1dc8d8c0 | 39 | * nlmsg_end() finalize netlink message |
fe4944e5 TG |
40 | * nlmsg_get_pos() return current position in message |
41 | * nlmsg_trim() trim part of message | |
bfa83a9e TG |
42 | * nlmsg_cancel() cancel message construction |
43 | * nlmsg_free() free a netlink message | |
44 | * | |
45 | * Message Sending: | |
46 | * nlmsg_multicast() multicast message to several groups | |
47 | * nlmsg_unicast() unicast a message to a single socket | |
d387f6ad | 48 | * nlmsg_notify() send notification message |
bfa83a9e TG |
49 | * |
50 | * Message Length Calculations: | |
51 | * nlmsg_msg_size(payload) length of message w/o padding | |
52 | * nlmsg_total_size(payload) length of message w/ padding | |
53 | * nlmsg_padlen(payload) length of padding at tail | |
54 | * | |
55 | * Message Payload Access: | |
56 | * nlmsg_data(nlh) head of message payload | |
57 | * nlmsg_len(nlh) length of message payload | |
58 | * nlmsg_attrdata(nlh, hdrlen) head of attributes data | |
59 | * nlmsg_attrlen(nlh, hdrlen) length of attributes data | |
60 | * | |
61 | * Message Parsing: | |
62 | * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes? | |
63 | * nlmsg_next(nlh, remaining) get next netlink message | |
64 | * nlmsg_parse() parse attributes of a message | |
65 | * nlmsg_find_attr() find an attribute in a message | |
66 | * nlmsg_for_each_msg() loop over all messages | |
67 | * nlmsg_validate() validate netlink message incl. attrs | |
68 | * nlmsg_for_each_attr() loop over all attributes | |
69 | * | |
97676b6b TG |
70 | * Misc: |
71 | * nlmsg_report() report back to application? | |
72 | * | |
bfa83a9e TG |
73 | * ------------------------------------------------------------------------ |
74 | * Attributes Interface | |
75 | * ------------------------------------------------------------------------ | |
76 | * | |
77 | * Attribute Format: | |
78 | * <------- nla_total_size(payload) -------> | |
79 | * <---- nla_attr_size(payload) -----> | |
80 | * +----------+- - -+- - - - - - - - - +- - -+-------- - - | |
81 | * | Header | Pad | Payload | Pad | Header | |
82 | * +----------+- - -+- - - - - - - - - +- - -+-------- - - | |
83 | * <- nla_len(nla) -> ^ | |
84 | * nla_data(nla)----^ | | |
85 | * nla_next(nla)-----------------------------' | |
86 | * | |
87 | * Data Structures: | |
d1ec3b77 | 88 | * struct nlattr netlink attribute header |
bfa83a9e TG |
89 | * |
90 | * Attribute Construction: | |
fe4944e5 TG |
91 | * nla_reserve(skb, type, len) reserve room for an attribute |
92 | * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr | |
bfa83a9e | 93 | * nla_put(skb, type, len, data) add attribute to skb |
fe4944e5 | 94 | * nla_put_nohdr(skb, len, data) add attribute w/o hdr |
01480e1c | 95 | * nla_append(skb, len, data) append data to skb |
bfa83a9e TG |
96 | * |
97 | * Attribute Construction for Basic Types: | |
98 | * nla_put_u8(skb, type, value) add u8 attribute to skb | |
99 | * nla_put_u16(skb, type, value) add u16 attribute to skb | |
100 | * nla_put_u32(skb, type, value) add u32 attribute to skb | |
26837012 REB |
101 | * nla_put_u64_64bit(skb, type, |
102 | * value, padattr) add u64 attribute to skb | |
4778e0be JP |
103 | * nla_put_s8(skb, type, value) add s8 attribute to skb |
104 | * nla_put_s16(skb, type, value) add s16 attribute to skb | |
105 | * nla_put_s32(skb, type, value) add s32 attribute to skb | |
756a2f59 ND |
106 | * nla_put_s64(skb, type, value, |
107 | * padattr) add s64 attribute to skb | |
bfa83a9e TG |
108 | * nla_put_string(skb, type, str) add string attribute to skb |
109 | * nla_put_flag(skb, type) add flag attribute to skb | |
2175d87c ND |
110 | * nla_put_msecs(skb, type, jiffies, |
111 | * padattr) add msecs attribute to skb | |
930345ea JB |
112 | * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb |
113 | * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb | |
bfa83a9e | 114 | * |
bfa83a9e TG |
115 | * Nested Attributes Construction: |
116 | * nla_nest_start(skb, type) start a nested attribute | |
117 | * nla_nest_end(skb, nla) finalize a nested attribute | |
118 | * nla_nest_cancel(skb, nla) cancel nested attribute construction | |
119 | * | |
120 | * Attribute Length Calculations: | |
121 | * nla_attr_size(payload) length of attribute w/o padding | |
122 | * nla_total_size(payload) length of attribute w/ padding | |
123 | * nla_padlen(payload) length of padding | |
124 | * | |
125 | * Attribute Payload Access: | |
126 | * nla_data(nla) head of attribute payload | |
127 | * nla_len(nla) length of attribute payload | |
128 | * | |
129 | * Attribute Payload Access for Basic Types: | |
130 | * nla_get_u8(nla) get payload for a u8 attribute | |
131 | * nla_get_u16(nla) get payload for a u16 attribute | |
132 | * nla_get_u32(nla) get payload for a u32 attribute | |
133 | * nla_get_u64(nla) get payload for a u64 attribute | |
4778e0be JP |
134 | * nla_get_s8(nla) get payload for a s8 attribute |
135 | * nla_get_s16(nla) get payload for a s16 attribute | |
136 | * nla_get_s32(nla) get payload for a s32 attribute | |
137 | * nla_get_s64(nla) get payload for a s64 attribute | |
bfa83a9e TG |
138 | * nla_get_flag(nla) return 1 if flag is true |
139 | * nla_get_msecs(nla) get payload for a msecs attribute | |
140 | * | |
141 | * Attribute Misc: | |
142 | * nla_memcpy(dest, nla, count) copy attribute into memory | |
143 | * nla_memcmp(nla, data, size) compare attribute with memory area | |
144 | * nla_strlcpy(dst, nla, size) copy attribute to a sized string | |
145 | * nla_strcmp(nla, str) compare attribute with string | |
146 | * | |
147 | * Attribute Parsing: | |
148 | * nla_ok(nla, remaining) does nla fit into remaining bytes? | |
149 | * nla_next(nla, remaining) get next netlink attribute | |
150 | * nla_validate() validate a stream of attributes | |
4fe5d5c0 | 151 | * nla_validate_nested() validate a stream of nested attributes |
bfa83a9e | 152 | * nla_find() find attribute in stream of attributes |
fe4944e5 | 153 | * nla_find_nested() find attribute in nested attributes |
bfa83a9e TG |
154 | * nla_parse() parse and validate stream of attrs |
155 | * nla_parse_nested() parse nested attribuets | |
156 | * nla_for_each_attr() loop over all attributes | |
22acb19a | 157 | * nla_for_each_nested() loop over the nested attributes |
bfa83a9e TG |
158 | *========================================================================= |
159 | */ | |
160 | ||
161 | /** | |
162 | * Standard attribute types to specify validation policy | |
163 | */ | |
164 | enum { | |
165 | NLA_UNSPEC, | |
166 | NLA_U8, | |
167 | NLA_U16, | |
168 | NLA_U32, | |
169 | NLA_U64, | |
170 | NLA_STRING, | |
171 | NLA_FLAG, | |
172 | NLA_MSECS, | |
173 | NLA_NESTED, | |
1092cb21 | 174 | NLA_NESTED_COMPAT, |
a5531a5d | 175 | NLA_NUL_STRING, |
d30045a0 | 176 | NLA_BINARY, |
4778e0be JP |
177 | NLA_S8, |
178 | NLA_S16, | |
179 | NLA_S32, | |
180 | NLA_S64, | |
64c83d83 | 181 | NLA_BITFIELD32, |
bfa83a9e TG |
182 | __NLA_TYPE_MAX, |
183 | }; | |
184 | ||
185 | #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) | |
186 | ||
187 | /** | |
188 | * struct nla_policy - attribute validation policy | |
189 | * @type: Type of attribute or NLA_UNSPEC | |
a5531a5d | 190 | * @len: Type specific length of payload |
bfa83a9e TG |
191 | * |
192 | * Policies are defined as arrays of this struct, the array must be | |
193 | * accessible by attribute type up to the highest identifier to be expected. | |
194 | * | |
a5531a5d TG |
195 | * Meaning of `len' field: |
196 | * NLA_STRING Maximum length of string | |
197 | * NLA_NUL_STRING Maximum length of string (excluding NUL) | |
198 | * NLA_FLAG Unused | |
d30045a0 | 199 | * NLA_BINARY Maximum length of attribute payload |
4b6cc728 JB |
200 | * NLA_NESTED Don't use `len' field -- length verification is |
201 | * done by checking len of nested header (or empty) | |
202 | * NLA_NESTED_COMPAT Minimum length of structure payload | |
203 | * NLA_U8, NLA_U16, | |
204 | * NLA_U32, NLA_U64, | |
4778e0be JP |
205 | * NLA_S8, NLA_S16, |
206 | * NLA_S32, NLA_S64, | |
4b6cc728 JB |
207 | * NLA_MSECS Leaving the length field zero will verify the |
208 | * given type fits, using it verifies minimum length | |
209 | * just like "All other" | |
64c83d83 | 210 | * NLA_BITFIELD32 A 32-bit bitmap/bitselector attribute |
4b6cc728 | 211 | * All other Minimum length of attribute payload |
a5531a5d | 212 | * |
bfa83a9e | 213 | * Example: |
b54452b0 | 214 | * static const struct nla_policy my_policy[ATTR_MAX+1] = { |
bfa83a9e | 215 | * [ATTR_FOO] = { .type = NLA_U16 }, |
d30045a0 | 216 | * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ }, |
a5531a5d | 217 | * [ATTR_BAZ] = { .len = sizeof(struct mystruct) }, |
64c83d83 | 218 | * [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags }, |
bfa83a9e TG |
219 | * }; |
220 | */ | |
221 | struct nla_policy { | |
222 | u16 type; | |
a5531a5d | 223 | u16 len; |
64c83d83 | 224 | void *validation_data; |
bfa83a9e TG |
225 | }; |
226 | ||
4e902c57 TG |
227 | /** |
228 | * struct nl_info - netlink source information | |
229 | * @nlh: Netlink message header of original request | |
15e47304 | 230 | * @portid: Netlink PORTID of requesting application |
4e902c57 TG |
231 | */ |
232 | struct nl_info { | |
233 | struct nlmsghdr *nlh; | |
4d1169c1 | 234 | struct net *nl_net; |
15e47304 | 235 | u32 portid; |
3b1137fe | 236 | bool skip_notify; |
4e902c57 TG |
237 | }; |
238 | ||
4f69053b | 239 | int netlink_rcv_skb(struct sk_buff *skb, |
2d4bc933 JB |
240 | int (*cb)(struct sk_buff *, struct nlmsghdr *, |
241 | struct netlink_ext_ack *)); | |
4f69053b JP |
242 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
243 | unsigned int group, int report, gfp_t flags); | |
82ace47a | 244 | |
4f69053b | 245 | int nla_validate(const struct nlattr *head, int len, int maxtype, |
fceb6435 JB |
246 | const struct nla_policy *policy, |
247 | struct netlink_ext_ack *extack); | |
4f69053b | 248 | int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head, |
fceb6435 JB |
249 | int len, const struct nla_policy *policy, |
250 | struct netlink_ext_ack *extack); | |
4f69053b JP |
251 | int nla_policy_len(const struct nla_policy *, int); |
252 | struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype); | |
253 | size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize); | |
2cf0c8b3 | 254 | char *nla_strdup(const struct nlattr *nla, gfp_t flags); |
4f69053b JP |
255 | int nla_memcpy(void *dest, const struct nlattr *src, int count); |
256 | int nla_memcmp(const struct nlattr *nla, const void *data, size_t size); | |
257 | int nla_strcmp(const struct nlattr *nla, const char *str); | |
258 | struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
089bf1a6 ND |
259 | struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
260 | int attrlen, int padattr); | |
4f69053b JP |
261 | void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
262 | struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen); | |
089bf1a6 ND |
263 | struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, |
264 | int attrlen, int padattr); | |
4f69053b JP |
265 | void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen); |
266 | void __nla_put(struct sk_buff *skb, int attrtype, int attrlen, | |
267 | const void *data); | |
089bf1a6 ND |
268 | void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
269 | const void *data, int padattr); | |
4f69053b JP |
270 | void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
271 | int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data); | |
089bf1a6 ND |
272 | int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, |
273 | const void *data, int padattr); | |
4f69053b JP |
274 | int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data); |
275 | int nla_append(struct sk_buff *skb, int attrlen, const void *data); | |
bfa83a9e TG |
276 | |
277 | /************************************************************************** | |
278 | * Netlink Messages | |
279 | **************************************************************************/ | |
280 | ||
281 | /** | |
282 | * nlmsg_msg_size - length of netlink message not including padding | |
283 | * @payload: length of message payload | |
284 | */ | |
285 | static inline int nlmsg_msg_size(int payload) | |
286 | { | |
287 | return NLMSG_HDRLEN + payload; | |
288 | } | |
289 | ||
290 | /** | |
291 | * nlmsg_total_size - length of netlink message including padding | |
292 | * @payload: length of message payload | |
293 | */ | |
294 | static inline int nlmsg_total_size(int payload) | |
295 | { | |
296 | return NLMSG_ALIGN(nlmsg_msg_size(payload)); | |
297 | } | |
298 | ||
299 | /** | |
300 | * nlmsg_padlen - length of padding at the message's tail | |
301 | * @payload: length of message payload | |
302 | */ | |
303 | static inline int nlmsg_padlen(int payload) | |
304 | { | |
305 | return nlmsg_total_size(payload) - nlmsg_msg_size(payload); | |
306 | } | |
307 | ||
308 | /** | |
309 | * nlmsg_data - head of message payload | |
70f23fd6 | 310 | * @nlh: netlink message header |
bfa83a9e TG |
311 | */ |
312 | static inline void *nlmsg_data(const struct nlmsghdr *nlh) | |
313 | { | |
314 | return (unsigned char *) nlh + NLMSG_HDRLEN; | |
315 | } | |
316 | ||
317 | /** | |
318 | * nlmsg_len - length of message payload | |
319 | * @nlh: netlink message header | |
320 | */ | |
321 | static inline int nlmsg_len(const struct nlmsghdr *nlh) | |
322 | { | |
323 | return nlh->nlmsg_len - NLMSG_HDRLEN; | |
324 | } | |
325 | ||
326 | /** | |
327 | * nlmsg_attrdata - head of attributes data | |
328 | * @nlh: netlink message header | |
329 | * @hdrlen: length of family specific header | |
330 | */ | |
331 | static inline struct nlattr *nlmsg_attrdata(const struct nlmsghdr *nlh, | |
332 | int hdrlen) | |
333 | { | |
334 | unsigned char *data = nlmsg_data(nlh); | |
335 | return (struct nlattr *) (data + NLMSG_ALIGN(hdrlen)); | |
336 | } | |
337 | ||
338 | /** | |
339 | * nlmsg_attrlen - length of attributes data | |
340 | * @nlh: netlink message header | |
341 | * @hdrlen: length of family specific header | |
342 | */ | |
343 | static inline int nlmsg_attrlen(const struct nlmsghdr *nlh, int hdrlen) | |
344 | { | |
345 | return nlmsg_len(nlh) - NLMSG_ALIGN(hdrlen); | |
346 | } | |
347 | ||
348 | /** | |
349 | * nlmsg_ok - check if the netlink message fits into the remaining bytes | |
350 | * @nlh: netlink message header | |
351 | * @remaining: number of bytes remaining in message stream | |
352 | */ | |
353 | static inline int nlmsg_ok(const struct nlmsghdr *nlh, int remaining) | |
354 | { | |
619e803d | 355 | return (remaining >= (int) sizeof(struct nlmsghdr) && |
bfa83a9e TG |
356 | nlh->nlmsg_len >= sizeof(struct nlmsghdr) && |
357 | nlh->nlmsg_len <= remaining); | |
358 | } | |
359 | ||
360 | /** | |
361 | * nlmsg_next - next netlink message in message stream | |
362 | * @nlh: netlink message header | |
363 | * @remaining: number of bytes remaining in message stream | |
364 | * | |
365 | * Returns the next netlink message in the message stream and | |
366 | * decrements remaining by the size of the current message. | |
367 | */ | |
3654654f JE |
368 | static inline struct nlmsghdr * |
369 | nlmsg_next(const struct nlmsghdr *nlh, int *remaining) | |
bfa83a9e TG |
370 | { |
371 | int totlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
372 | ||
373 | *remaining -= totlen; | |
374 | ||
375 | return (struct nlmsghdr *) ((unsigned char *) nlh + totlen); | |
376 | } | |
377 | ||
378 | /** | |
379 | * nlmsg_parse - parse attributes of a netlink message | |
380 | * @nlh: netlink message header | |
381 | * @hdrlen: length of family specific header | |
382 | * @tb: destination array with maxtype+1 elements | |
383 | * @maxtype: maximum attribute type to be expected | |
384 | * @policy: validation policy | |
fceb6435 | 385 | * @extack: extended ACK report struct |
bfa83a9e TG |
386 | * |
387 | * See nla_parse() | |
388 | */ | |
3a6c2b41 | 389 | static inline int nlmsg_parse(const struct nlmsghdr *nlh, int hdrlen, |
bfa83a9e | 390 | struct nlattr *tb[], int maxtype, |
fceb6435 JB |
391 | const struct nla_policy *policy, |
392 | struct netlink_ext_ack *extack) | |
bfa83a9e TG |
393 | { |
394 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
395 | return -EINVAL; | |
396 | ||
397 | return nla_parse(tb, maxtype, nlmsg_attrdata(nlh, hdrlen), | |
fceb6435 | 398 | nlmsg_attrlen(nlh, hdrlen), policy, extack); |
bfa83a9e TG |
399 | } |
400 | ||
401 | /** | |
402 | * nlmsg_find_attr - find a specific attribute in a netlink message | |
403 | * @nlh: netlink message header | |
404 | * @hdrlen: length of familiy specific header | |
405 | * @attrtype: type of attribute to look for | |
406 | * | |
407 | * Returns the first attribute which matches the specified type. | |
408 | */ | |
6b8c92ba | 409 | static inline struct nlattr *nlmsg_find_attr(const struct nlmsghdr *nlh, |
bfa83a9e TG |
410 | int hdrlen, int attrtype) |
411 | { | |
412 | return nla_find(nlmsg_attrdata(nlh, hdrlen), | |
413 | nlmsg_attrlen(nlh, hdrlen), attrtype); | |
414 | } | |
415 | ||
416 | /** | |
417 | * nlmsg_validate - validate a netlink message including attributes | |
418 | * @nlh: netlinket message header | |
419 | * @hdrlen: length of familiy specific header | |
420 | * @maxtype: maximum attribute type to be expected | |
421 | * @policy: validation policy | |
fceb6435 | 422 | * @extack: extended ACK report struct |
bfa83a9e | 423 | */ |
3654654f JE |
424 | static inline int nlmsg_validate(const struct nlmsghdr *nlh, |
425 | int hdrlen, int maxtype, | |
fceb6435 JB |
426 | const struct nla_policy *policy, |
427 | struct netlink_ext_ack *extack) | |
bfa83a9e TG |
428 | { |
429 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) | |
430 | return -EINVAL; | |
431 | ||
432 | return nla_validate(nlmsg_attrdata(nlh, hdrlen), | |
fceb6435 JB |
433 | nlmsg_attrlen(nlh, hdrlen), maxtype, policy, |
434 | extack); | |
bfa83a9e TG |
435 | } |
436 | ||
97676b6b TG |
437 | /** |
438 | * nlmsg_report - need to report back to application? | |
439 | * @nlh: netlink message header | |
440 | * | |
441 | * Returns 1 if a report back to the application is requested. | |
442 | */ | |
3a6c2b41 | 443 | static inline int nlmsg_report(const struct nlmsghdr *nlh) |
97676b6b TG |
444 | { |
445 | return !!(nlh->nlmsg_flags & NLM_F_ECHO); | |
446 | } | |
447 | ||
bfa83a9e TG |
448 | /** |
449 | * nlmsg_for_each_attr - iterate over a stream of attributes | |
450 | * @pos: loop counter, set to current attribute | |
451 | * @nlh: netlink message header | |
452 | * @hdrlen: length of familiy specific header | |
453 | * @rem: initialized to len, holds bytes currently remaining in stream | |
454 | */ | |
455 | #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \ | |
456 | nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \ | |
457 | nlmsg_attrlen(nlh, hdrlen), rem) | |
458 | ||
bfa83a9e TG |
459 | /** |
460 | * nlmsg_put - Add a new netlink message to an skb | |
461 | * @skb: socket buffer to store message in | |
2c6ba4b1 | 462 | * @portid: netlink PORTID of requesting application |
bfa83a9e TG |
463 | * @seq: sequence number of message |
464 | * @type: message type | |
465 | * @payload: length of message payload | |
466 | * @flags: message flags | |
467 | * | |
468 | * Returns NULL if the tailroom of the skb is insufficient to store | |
469 | * the message header and payload. | |
470 | */ | |
15e47304 | 471 | static inline struct nlmsghdr *nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, |
bfa83a9e TG |
472 | int type, int payload, int flags) |
473 | { | |
474 | if (unlikely(skb_tailroom(skb) < nlmsg_total_size(payload))) | |
475 | return NULL; | |
476 | ||
15e47304 | 477 | return __nlmsg_put(skb, portid, seq, type, payload, flags); |
bfa83a9e TG |
478 | } |
479 | ||
480 | /** | |
481 | * nlmsg_put_answer - Add a new callback based netlink message to an skb | |
482 | * @skb: socket buffer to store message in | |
483 | * @cb: netlink callback | |
484 | * @type: message type | |
485 | * @payload: length of message payload | |
486 | * @flags: message flags | |
487 | * | |
488 | * Returns NULL if the tailroom of the skb is insufficient to store | |
489 | * the message header and payload. | |
490 | */ | |
491 | static inline struct nlmsghdr *nlmsg_put_answer(struct sk_buff *skb, | |
492 | struct netlink_callback *cb, | |
493 | int type, int payload, | |
494 | int flags) | |
495 | { | |
15e47304 | 496 | return nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
bfa83a9e TG |
497 | type, payload, flags); |
498 | } | |
499 | ||
500 | /** | |
501 | * nlmsg_new - Allocate a new netlink message | |
339bf98f | 502 | * @payload: size of the message payload |
fe4944e5 | 503 | * @flags: the type of memory to allocate. |
bfa83a9e | 504 | * |
339bf98f TG |
505 | * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known |
506 | * and a good default is needed. | |
bfa83a9e | 507 | */ |
339bf98f | 508 | static inline struct sk_buff *nlmsg_new(size_t payload, gfp_t flags) |
bfa83a9e | 509 | { |
339bf98f | 510 | return alloc_skb(nlmsg_total_size(payload), flags); |
bfa83a9e TG |
511 | } |
512 | ||
513 | /** | |
514 | * nlmsg_end - Finalize a netlink message | |
515 | * @skb: socket buffer the message is stored in | |
516 | * @nlh: netlink message header | |
517 | * | |
518 | * Corrects the netlink message header to include the appeneded | |
519 | * attributes. Only necessary if attributes have been added to | |
520 | * the message. | |
bfa83a9e | 521 | */ |
053c095a | 522 | static inline void nlmsg_end(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 523 | { |
27a884dc | 524 | nlh->nlmsg_len = skb_tail_pointer(skb) - (unsigned char *)nlh; |
bfa83a9e TG |
525 | } |
526 | ||
fe4944e5 TG |
527 | /** |
528 | * nlmsg_get_pos - return current position in netlink message | |
529 | * @skb: socket buffer the message is stored in | |
530 | * | |
531 | * Returns a pointer to the current tail of the message. | |
532 | */ | |
533 | static inline void *nlmsg_get_pos(struct sk_buff *skb) | |
534 | { | |
27a884dc | 535 | return skb_tail_pointer(skb); |
fe4944e5 TG |
536 | } |
537 | ||
538 | /** | |
539 | * nlmsg_trim - Trim message to a mark | |
540 | * @skb: socket buffer the message is stored in | |
541 | * @mark: mark to trim to | |
542 | * | |
bc3ed28c | 543 | * Trims the message to the provided mark. |
fe4944e5 | 544 | */ |
bc3ed28c | 545 | static inline void nlmsg_trim(struct sk_buff *skb, const void *mark) |
fe4944e5 | 546 | { |
149118d8 TG |
547 | if (mark) { |
548 | WARN_ON((unsigned char *) mark < skb->data); | |
fe4944e5 | 549 | skb_trim(skb, (unsigned char *) mark - skb->data); |
149118d8 | 550 | } |
fe4944e5 TG |
551 | } |
552 | ||
bfa83a9e TG |
553 | /** |
554 | * nlmsg_cancel - Cancel construction of a netlink message | |
555 | * @skb: socket buffer the message is stored in | |
556 | * @nlh: netlink message header | |
557 | * | |
558 | * Removes the complete netlink message including all | |
bc3ed28c | 559 | * attributes from the socket buffer again. |
bfa83a9e | 560 | */ |
bc3ed28c | 561 | static inline void nlmsg_cancel(struct sk_buff *skb, struct nlmsghdr *nlh) |
bfa83a9e | 562 | { |
bc3ed28c | 563 | nlmsg_trim(skb, nlh); |
bfa83a9e TG |
564 | } |
565 | ||
566 | /** | |
567 | * nlmsg_free - free a netlink message | |
568 | * @skb: socket buffer of netlink message | |
569 | */ | |
570 | static inline void nlmsg_free(struct sk_buff *skb) | |
571 | { | |
572 | kfree_skb(skb); | |
573 | } | |
574 | ||
575 | /** | |
576 | * nlmsg_multicast - multicast a netlink message | |
577 | * @sk: netlink socket to spread messages to | |
578 | * @skb: netlink message as socket buffer | |
15e47304 | 579 | * @portid: own netlink portid to avoid sending to yourself |
bfa83a9e | 580 | * @group: multicast group id |
d387f6ad | 581 | * @flags: allocation flags |
bfa83a9e TG |
582 | */ |
583 | static inline int nlmsg_multicast(struct sock *sk, struct sk_buff *skb, | |
15e47304 | 584 | u32 portid, unsigned int group, gfp_t flags) |
bfa83a9e TG |
585 | { |
586 | int err; | |
587 | ||
588 | NETLINK_CB(skb).dst_group = group; | |
589 | ||
15e47304 | 590 | err = netlink_broadcast(sk, skb, portid, group, flags); |
bfa83a9e TG |
591 | if (err > 0) |
592 | err = 0; | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
597 | /** | |
598 | * nlmsg_unicast - unicast a netlink message | |
599 | * @sk: netlink socket to spread message to | |
600 | * @skb: netlink message as socket buffer | |
15e47304 | 601 | * @portid: netlink portid of the destination socket |
bfa83a9e | 602 | */ |
15e47304 | 603 | static inline int nlmsg_unicast(struct sock *sk, struct sk_buff *skb, u32 portid) |
bfa83a9e TG |
604 | { |
605 | int err; | |
606 | ||
15e47304 | 607 | err = netlink_unicast(sk, skb, portid, MSG_DONTWAIT); |
bfa83a9e TG |
608 | if (err > 0) |
609 | err = 0; | |
610 | ||
611 | return err; | |
612 | } | |
613 | ||
614 | /** | |
615 | * nlmsg_for_each_msg - iterate over a stream of messages | |
616 | * @pos: loop counter, set to current message | |
617 | * @head: head of message stream | |
618 | * @len: length of message stream | |
619 | * @rem: initialized to len, holds bytes currently remaining in stream | |
620 | */ | |
621 | #define nlmsg_for_each_msg(pos, head, len, rem) \ | |
622 | for (pos = head, rem = len; \ | |
623 | nlmsg_ok(pos, rem); \ | |
624 | pos = nlmsg_next(pos, &(rem))) | |
625 | ||
670dc283 JB |
626 | /** |
627 | * nl_dump_check_consistent - check if sequence is consistent and advertise if not | |
628 | * @cb: netlink callback structure that stores the sequence number | |
629 | * @nlh: netlink message header to write the flag to | |
630 | * | |
631 | * This function checks if the sequence (generation) number changed during dump | |
632 | * and if it did, advertises it in the netlink message header. | |
633 | * | |
634 | * The correct way to use it is to set cb->seq to the generation counter when | |
635 | * all locks for dumping have been acquired, and then call this function for | |
636 | * each message that is generated. | |
637 | * | |
638 | * Note that due to initialisation concerns, 0 is an invalid sequence number | |
639 | * and must not be used by code that uses this functionality. | |
640 | */ | |
641 | static inline void | |
642 | nl_dump_check_consistent(struct netlink_callback *cb, | |
643 | struct nlmsghdr *nlh) | |
644 | { | |
645 | if (cb->prev_seq && cb->seq != cb->prev_seq) | |
646 | nlh->nlmsg_flags |= NLM_F_DUMP_INTR; | |
647 | cb->prev_seq = cb->seq; | |
648 | } | |
649 | ||
bfa83a9e TG |
650 | /************************************************************************** |
651 | * Netlink Attributes | |
652 | **************************************************************************/ | |
653 | ||
654 | /** | |
655 | * nla_attr_size - length of attribute not including padding | |
656 | * @payload: length of payload | |
657 | */ | |
658 | static inline int nla_attr_size(int payload) | |
659 | { | |
660 | return NLA_HDRLEN + payload; | |
661 | } | |
662 | ||
663 | /** | |
664 | * nla_total_size - total length of attribute including padding | |
665 | * @payload: length of payload | |
666 | */ | |
667 | static inline int nla_total_size(int payload) | |
668 | { | |
669 | return NLA_ALIGN(nla_attr_size(payload)); | |
670 | } | |
671 | ||
672 | /** | |
673 | * nla_padlen - length of padding at the tail of attribute | |
674 | * @payload: length of payload | |
675 | */ | |
676 | static inline int nla_padlen(int payload) | |
677 | { | |
678 | return nla_total_size(payload) - nla_attr_size(payload); | |
679 | } | |
680 | ||
8f4c1f9b TG |
681 | /** |
682 | * nla_type - attribute type | |
683 | * @nla: netlink attribute | |
684 | */ | |
685 | static inline int nla_type(const struct nlattr *nla) | |
686 | { | |
687 | return nla->nla_type & NLA_TYPE_MASK; | |
688 | } | |
689 | ||
bfa83a9e TG |
690 | /** |
691 | * nla_data - head of payload | |
692 | * @nla: netlink attribute | |
693 | */ | |
694 | static inline void *nla_data(const struct nlattr *nla) | |
695 | { | |
696 | return (char *) nla + NLA_HDRLEN; | |
697 | } | |
698 | ||
699 | /** | |
700 | * nla_len - length of payload | |
701 | * @nla: netlink attribute | |
702 | */ | |
703 | static inline int nla_len(const struct nlattr *nla) | |
704 | { | |
705 | return nla->nla_len - NLA_HDRLEN; | |
706 | } | |
707 | ||
708 | /** | |
709 | * nla_ok - check if the netlink attribute fits into the remaining bytes | |
710 | * @nla: netlink attribute | |
711 | * @remaining: number of bytes remaining in attribute stream | |
712 | */ | |
713 | static inline int nla_ok(const struct nlattr *nla, int remaining) | |
714 | { | |
3e1ed981 AD |
715 | return remaining >= (int) sizeof(*nla) && |
716 | nla->nla_len >= sizeof(*nla) && | |
bfa83a9e TG |
717 | nla->nla_len <= remaining; |
718 | } | |
719 | ||
720 | /** | |
d1ec3b77 | 721 | * nla_next - next netlink attribute in attribute stream |
bfa83a9e TG |
722 | * @nla: netlink attribute |
723 | * @remaining: number of bytes remaining in attribute stream | |
724 | * | |
725 | * Returns the next netlink attribute in the attribute stream and | |
726 | * decrements remaining by the size of the current attribute. | |
727 | */ | |
728 | static inline struct nlattr *nla_next(const struct nlattr *nla, int *remaining) | |
729 | { | |
3b2c75d3 | 730 | unsigned int totlen = NLA_ALIGN(nla->nla_len); |
bfa83a9e TG |
731 | |
732 | *remaining -= totlen; | |
733 | return (struct nlattr *) ((char *) nla + totlen); | |
734 | } | |
735 | ||
fe4944e5 TG |
736 | /** |
737 | * nla_find_nested - find attribute in a set of nested attributes | |
738 | * @nla: attribute containing the nested attributes | |
739 | * @attrtype: type of attribute to look for | |
740 | * | |
741 | * Returns the first attribute which matches the specified type. | |
742 | */ | |
3654654f JE |
743 | static inline struct nlattr * |
744 | nla_find_nested(const struct nlattr *nla, int attrtype) | |
fe4944e5 TG |
745 | { |
746 | return nla_find(nla_data(nla), nla_len(nla), attrtype); | |
747 | } | |
748 | ||
bfa83a9e TG |
749 | /** |
750 | * nla_parse_nested - parse nested attributes | |
751 | * @tb: destination array with maxtype+1 elements | |
752 | * @maxtype: maximum attribute type to be expected | |
753 | * @nla: attribute containing the nested attributes | |
754 | * @policy: validation policy | |
fceb6435 | 755 | * @extack: extended ACK report struct |
bfa83a9e TG |
756 | * |
757 | * See nla_parse() | |
758 | */ | |
759 | static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, | |
b057efd4 | 760 | const struct nlattr *nla, |
fceb6435 JB |
761 | const struct nla_policy *policy, |
762 | struct netlink_ext_ack *extack) | |
bfa83a9e | 763 | { |
fceb6435 JB |
764 | return nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, |
765 | extack); | |
bfa83a9e | 766 | } |
1092cb21 | 767 | |
bfa83a9e | 768 | /** |
d1ec3b77 | 769 | * nla_put_u8 - Add a u8 netlink attribute to a socket buffer |
bfa83a9e TG |
770 | * @skb: socket buffer to add attribute to |
771 | * @attrtype: attribute type | |
772 | * @value: numeric value | |
773 | */ | |
774 | static inline int nla_put_u8(struct sk_buff *skb, int attrtype, u8 value) | |
775 | { | |
776 | return nla_put(skb, attrtype, sizeof(u8), &value); | |
777 | } | |
778 | ||
779 | /** | |
780 | * nla_put_u16 - Add a u16 netlink attribute to a socket buffer | |
781 | * @skb: socket buffer to add attribute to | |
782 | * @attrtype: attribute type | |
783 | * @value: numeric value | |
784 | */ | |
785 | static inline int nla_put_u16(struct sk_buff *skb, int attrtype, u16 value) | |
786 | { | |
787 | return nla_put(skb, attrtype, sizeof(u16), &value); | |
788 | } | |
789 | ||
569a8fc3 DM |
790 | /** |
791 | * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer | |
792 | * @skb: socket buffer to add attribute to | |
793 | * @attrtype: attribute type | |
794 | * @value: numeric value | |
795 | */ | |
796 | static inline int nla_put_be16(struct sk_buff *skb, int attrtype, __be16 value) | |
797 | { | |
798 | return nla_put(skb, attrtype, sizeof(__be16), &value); | |
799 | } | |
800 | ||
6c1dd3b6 DM |
801 | /** |
802 | * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer | |
803 | * @skb: socket buffer to add attribute to | |
804 | * @attrtype: attribute type | |
805 | * @value: numeric value | |
806 | */ | |
807 | static inline int nla_put_net16(struct sk_buff *skb, int attrtype, __be16 value) | |
808 | { | |
809 | return nla_put_be16(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
810 | } | |
811 | ||
24c410dc DM |
812 | /** |
813 | * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer | |
814 | * @skb: socket buffer to add attribute to | |
815 | * @attrtype: attribute type | |
816 | * @value: numeric value | |
817 | */ | |
818 | static inline int nla_put_le16(struct sk_buff *skb, int attrtype, __le16 value) | |
819 | { | |
820 | return nla_put(skb, attrtype, sizeof(__le16), &value); | |
821 | } | |
822 | ||
bfa83a9e TG |
823 | /** |
824 | * nla_put_u32 - Add a u32 netlink attribute to a socket buffer | |
825 | * @skb: socket buffer to add attribute to | |
826 | * @attrtype: attribute type | |
827 | * @value: numeric value | |
828 | */ | |
829 | static inline int nla_put_u32(struct sk_buff *skb, int attrtype, u32 value) | |
830 | { | |
831 | return nla_put(skb, attrtype, sizeof(u32), &value); | |
832 | } | |
833 | ||
834 | /** | |
569a8fc3 DM |
835 | * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer |
836 | * @skb: socket buffer to add attribute to | |
837 | * @attrtype: attribute type | |
838 | * @value: numeric value | |
839 | */ | |
840 | static inline int nla_put_be32(struct sk_buff *skb, int attrtype, __be32 value) | |
841 | { | |
842 | return nla_put(skb, attrtype, sizeof(__be32), &value); | |
843 | } | |
844 | ||
6c1dd3b6 DM |
845 | /** |
846 | * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer | |
847 | * @skb: socket buffer to add attribute to | |
848 | * @attrtype: attribute type | |
849 | * @value: numeric value | |
850 | */ | |
851 | static inline int nla_put_net32(struct sk_buff *skb, int attrtype, __be32 value) | |
852 | { | |
853 | return nla_put_be32(skb, attrtype | NLA_F_NET_BYTEORDER, value); | |
854 | } | |
855 | ||
24c410dc DM |
856 | /** |
857 | * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer | |
858 | * @skb: socket buffer to add attribute to | |
859 | * @attrtype: attribute type | |
860 | * @value: numeric value | |
861 | */ | |
862 | static inline int nla_put_le32(struct sk_buff *skb, int attrtype, __le32 value) | |
863 | { | |
864 | return nla_put(skb, attrtype, sizeof(__le32), &value); | |
865 | } | |
866 | ||
73520786 ND |
867 | /** |
868 | * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it | |
869 | * @skb: socket buffer to add attribute to | |
870 | * @attrtype: attribute type | |
871 | * @value: numeric value | |
872 | * @padattr: attribute type for the padding | |
873 | */ | |
874 | static inline int nla_put_u64_64bit(struct sk_buff *skb, int attrtype, | |
875 | u64 value, int padattr) | |
876 | { | |
877 | return nla_put_64bit(skb, attrtype, sizeof(u64), &value, padattr); | |
878 | } | |
879 | ||
569a8fc3 | 880 | /** |
b46f6ded | 881 | * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it |
569a8fc3 DM |
882 | * @skb: socket buffer to add attribute to |
883 | * @attrtype: attribute type | |
884 | * @value: numeric value | |
b46f6ded | 885 | * @padattr: attribute type for the padding |
569a8fc3 | 886 | */ |
b46f6ded ND |
887 | static inline int nla_put_be64(struct sk_buff *skb, int attrtype, __be64 value, |
888 | int padattr) | |
569a8fc3 | 889 | { |
b46f6ded | 890 | return nla_put_64bit(skb, attrtype, sizeof(__be64), &value, padattr); |
569a8fc3 DM |
891 | } |
892 | ||
6c1dd3b6 | 893 | /** |
e9bbe898 | 894 | * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it |
6c1dd3b6 DM |
895 | * @skb: socket buffer to add attribute to |
896 | * @attrtype: attribute type | |
897 | * @value: numeric value | |
e9bbe898 | 898 | * @padattr: attribute type for the padding |
6c1dd3b6 | 899 | */ |
e9bbe898 ND |
900 | static inline int nla_put_net64(struct sk_buff *skb, int attrtype, __be64 value, |
901 | int padattr) | |
6c1dd3b6 | 902 | { |
e9bbe898 ND |
903 | return nla_put_be64(skb, attrtype | NLA_F_NET_BYTEORDER, value, |
904 | padattr); | |
6c1dd3b6 DM |
905 | } |
906 | ||
24c410dc | 907 | /** |
e7479122 | 908 | * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it |
24c410dc DM |
909 | * @skb: socket buffer to add attribute to |
910 | * @attrtype: attribute type | |
911 | * @value: numeric value | |
e7479122 | 912 | * @padattr: attribute type for the padding |
24c410dc | 913 | */ |
e7479122 ND |
914 | static inline int nla_put_le64(struct sk_buff *skb, int attrtype, __le64 value, |
915 | int padattr) | |
24c410dc | 916 | { |
e7479122 | 917 | return nla_put_64bit(skb, attrtype, sizeof(__le64), &value, padattr); |
24c410dc DM |
918 | } |
919 | ||
4778e0be JP |
920 | /** |
921 | * nla_put_s8 - Add a s8 netlink attribute to a socket buffer | |
922 | * @skb: socket buffer to add attribute to | |
923 | * @attrtype: attribute type | |
924 | * @value: numeric value | |
925 | */ | |
926 | static inline int nla_put_s8(struct sk_buff *skb, int attrtype, s8 value) | |
927 | { | |
928 | return nla_put(skb, attrtype, sizeof(s8), &value); | |
929 | } | |
930 | ||
931 | /** | |
932 | * nla_put_s16 - Add a s16 netlink attribute to a socket buffer | |
933 | * @skb: socket buffer to add attribute to | |
934 | * @attrtype: attribute type | |
935 | * @value: numeric value | |
936 | */ | |
937 | static inline int nla_put_s16(struct sk_buff *skb, int attrtype, s16 value) | |
938 | { | |
939 | return nla_put(skb, attrtype, sizeof(s16), &value); | |
940 | } | |
941 | ||
942 | /** | |
943 | * nla_put_s32 - Add a s32 netlink attribute to a socket buffer | |
944 | * @skb: socket buffer to add attribute to | |
945 | * @attrtype: attribute type | |
946 | * @value: numeric value | |
947 | */ | |
948 | static inline int nla_put_s32(struct sk_buff *skb, int attrtype, s32 value) | |
949 | { | |
950 | return nla_put(skb, attrtype, sizeof(s32), &value); | |
951 | } | |
952 | ||
953 | /** | |
756a2f59 | 954 | * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it |
4778e0be JP |
955 | * @skb: socket buffer to add attribute to |
956 | * @attrtype: attribute type | |
957 | * @value: numeric value | |
756a2f59 | 958 | * @padattr: attribute type for the padding |
4778e0be | 959 | */ |
756a2f59 ND |
960 | static inline int nla_put_s64(struct sk_buff *skb, int attrtype, s64 value, |
961 | int padattr) | |
4778e0be | 962 | { |
756a2f59 | 963 | return nla_put_64bit(skb, attrtype, sizeof(s64), &value, padattr); |
4778e0be JP |
964 | } |
965 | ||
bfa83a9e TG |
966 | /** |
967 | * nla_put_string - Add a string netlink attribute to a socket buffer | |
968 | * @skb: socket buffer to add attribute to | |
969 | * @attrtype: attribute type | |
970 | * @str: NUL terminated string | |
971 | */ | |
972 | static inline int nla_put_string(struct sk_buff *skb, int attrtype, | |
973 | const char *str) | |
974 | { | |
975 | return nla_put(skb, attrtype, strlen(str) + 1, str); | |
976 | } | |
977 | ||
978 | /** | |
979 | * nla_put_flag - Add a flag netlink attribute to a socket buffer | |
980 | * @skb: socket buffer to add attribute to | |
981 | * @attrtype: attribute type | |
982 | */ | |
983 | static inline int nla_put_flag(struct sk_buff *skb, int attrtype) | |
984 | { | |
985 | return nla_put(skb, attrtype, 0, NULL); | |
986 | } | |
987 | ||
988 | /** | |
2175d87c | 989 | * nla_put_msecs - Add a msecs netlink attribute to a skb and align it |
bfa83a9e TG |
990 | * @skb: socket buffer to add attribute to |
991 | * @attrtype: attribute type | |
d87de1f3 | 992 | * @njiffies: number of jiffies to convert to msecs |
2175d87c | 993 | * @padattr: attribute type for the padding |
bfa83a9e TG |
994 | */ |
995 | static inline int nla_put_msecs(struct sk_buff *skb, int attrtype, | |
2175d87c | 996 | unsigned long njiffies, int padattr) |
bfa83a9e | 997 | { |
d87de1f3 | 998 | u64 tmp = jiffies_to_msecs(njiffies); |
2175d87c ND |
999 | |
1000 | return nla_put_64bit(skb, attrtype, sizeof(u64), &tmp, padattr); | |
bfa83a9e TG |
1001 | } |
1002 | ||
930345ea JB |
1003 | /** |
1004 | * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket | |
1005 | * buffer | |
1006 | * @skb: socket buffer to add attribute to | |
1007 | * @attrtype: attribute type | |
1008 | * @addr: IPv4 address | |
1009 | */ | |
1010 | static inline int nla_put_in_addr(struct sk_buff *skb, int attrtype, | |
1011 | __be32 addr) | |
1012 | { | |
1013 | return nla_put_be32(skb, attrtype, addr); | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket | |
1018 | * buffer | |
1019 | * @skb: socket buffer to add attribute to | |
1020 | * @attrtype: attribute type | |
1021 | * @addr: IPv6 address | |
1022 | */ | |
1023 | static inline int nla_put_in6_addr(struct sk_buff *skb, int attrtype, | |
1024 | const struct in6_addr *addr) | |
1025 | { | |
1026 | return nla_put(skb, attrtype, sizeof(*addr), addr); | |
1027 | } | |
1028 | ||
bfa83a9e TG |
1029 | /** |
1030 | * nla_get_u32 - return payload of u32 attribute | |
1031 | * @nla: u32 netlink attribute | |
1032 | */ | |
b057efd4 | 1033 | static inline u32 nla_get_u32(const struct nlattr *nla) |
bfa83a9e TG |
1034 | { |
1035 | return *(u32 *) nla_data(nla); | |
1036 | } | |
1037 | ||
00012e5b AV |
1038 | /** |
1039 | * nla_get_be32 - return payload of __be32 attribute | |
1040 | * @nla: __be32 netlink attribute | |
1041 | */ | |
b057efd4 | 1042 | static inline __be32 nla_get_be32(const struct nlattr *nla) |
00012e5b AV |
1043 | { |
1044 | return *(__be32 *) nla_data(nla); | |
1045 | } | |
1046 | ||
c648a013 AA |
1047 | /** |
1048 | * nla_get_le32 - return payload of __le32 attribute | |
1049 | * @nla: __le32 netlink attribute | |
1050 | */ | |
1051 | static inline __le32 nla_get_le32(const struct nlattr *nla) | |
1052 | { | |
1053 | return *(__le32 *) nla_data(nla); | |
1054 | } | |
1055 | ||
bfa83a9e TG |
1056 | /** |
1057 | * nla_get_u16 - return payload of u16 attribute | |
1058 | * @nla: u16 netlink attribute | |
1059 | */ | |
b057efd4 | 1060 | static inline u16 nla_get_u16(const struct nlattr *nla) |
bfa83a9e TG |
1061 | { |
1062 | return *(u16 *) nla_data(nla); | |
1063 | } | |
1064 | ||
838965ba PM |
1065 | /** |
1066 | * nla_get_be16 - return payload of __be16 attribute | |
1067 | * @nla: __be16 netlink attribute | |
1068 | */ | |
b057efd4 | 1069 | static inline __be16 nla_get_be16(const struct nlattr *nla) |
838965ba PM |
1070 | { |
1071 | return *(__be16 *) nla_data(nla); | |
1072 | } | |
1073 | ||
4a89c256 TG |
1074 | /** |
1075 | * nla_get_le16 - return payload of __le16 attribute | |
1076 | * @nla: __le16 netlink attribute | |
1077 | */ | |
b057efd4 | 1078 | static inline __le16 nla_get_le16(const struct nlattr *nla) |
4a89c256 TG |
1079 | { |
1080 | return *(__le16 *) nla_data(nla); | |
1081 | } | |
1082 | ||
bfa83a9e TG |
1083 | /** |
1084 | * nla_get_u8 - return payload of u8 attribute | |
1085 | * @nla: u8 netlink attribute | |
1086 | */ | |
b057efd4 | 1087 | static inline u8 nla_get_u8(const struct nlattr *nla) |
bfa83a9e TG |
1088 | { |
1089 | return *(u8 *) nla_data(nla); | |
1090 | } | |
1091 | ||
1092 | /** | |
1093 | * nla_get_u64 - return payload of u64 attribute | |
1094 | * @nla: u64 netlink attribute | |
1095 | */ | |
b057efd4 | 1096 | static inline u64 nla_get_u64(const struct nlattr *nla) |
bfa83a9e TG |
1097 | { |
1098 | u64 tmp; | |
1099 | ||
1100 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1101 | ||
1102 | return tmp; | |
1103 | } | |
1104 | ||
a17c8598 PNA |
1105 | /** |
1106 | * nla_get_be64 - return payload of __be64 attribute | |
1107 | * @nla: __be64 netlink attribute | |
1108 | */ | |
1109 | static inline __be64 nla_get_be64(const struct nlattr *nla) | |
1110 | { | |
f5d410f2 PNA |
1111 | __be64 tmp; |
1112 | ||
1113 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1114 | ||
4778e0be JP |
1115 | return tmp; |
1116 | } | |
1117 | ||
c648a013 AA |
1118 | /** |
1119 | * nla_get_le64 - return payload of __le64 attribute | |
1120 | * @nla: __le64 netlink attribute | |
1121 | */ | |
1122 | static inline __le64 nla_get_le64(const struct nlattr *nla) | |
1123 | { | |
1124 | return *(__le64 *) nla_data(nla); | |
1125 | } | |
1126 | ||
4778e0be JP |
1127 | /** |
1128 | * nla_get_s32 - return payload of s32 attribute | |
1129 | * @nla: s32 netlink attribute | |
1130 | */ | |
1131 | static inline s32 nla_get_s32(const struct nlattr *nla) | |
1132 | { | |
1133 | return *(s32 *) nla_data(nla); | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * nla_get_s16 - return payload of s16 attribute | |
1138 | * @nla: s16 netlink attribute | |
1139 | */ | |
1140 | static inline s16 nla_get_s16(const struct nlattr *nla) | |
1141 | { | |
1142 | return *(s16 *) nla_data(nla); | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * nla_get_s8 - return payload of s8 attribute | |
1147 | * @nla: s8 netlink attribute | |
1148 | */ | |
1149 | static inline s8 nla_get_s8(const struct nlattr *nla) | |
1150 | { | |
1151 | return *(s8 *) nla_data(nla); | |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * nla_get_s64 - return payload of s64 attribute | |
1156 | * @nla: s64 netlink attribute | |
1157 | */ | |
1158 | static inline s64 nla_get_s64(const struct nlattr *nla) | |
1159 | { | |
1160 | s64 tmp; | |
1161 | ||
1162 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1163 | ||
f5d410f2 | 1164 | return tmp; |
a17c8598 PNA |
1165 | } |
1166 | ||
bfa83a9e TG |
1167 | /** |
1168 | * nla_get_flag - return payload of flag attribute | |
1169 | * @nla: flag netlink attribute | |
1170 | */ | |
b057efd4 | 1171 | static inline int nla_get_flag(const struct nlattr *nla) |
bfa83a9e TG |
1172 | { |
1173 | return !!nla; | |
1174 | } | |
1175 | ||
1176 | /** | |
1177 | * nla_get_msecs - return payload of msecs attribute | |
1178 | * @nla: msecs netlink attribute | |
1179 | * | |
1180 | * Returns the number of milliseconds in jiffies. | |
1181 | */ | |
b057efd4 | 1182 | static inline unsigned long nla_get_msecs(const struct nlattr *nla) |
bfa83a9e TG |
1183 | { |
1184 | u64 msecs = nla_get_u64(nla); | |
1185 | ||
1186 | return msecs_to_jiffies((unsigned long) msecs); | |
1187 | } | |
1188 | ||
67b61f6c JB |
1189 | /** |
1190 | * nla_get_in_addr - return payload of IPv4 address attribute | |
1191 | * @nla: IPv4 address netlink attribute | |
1192 | */ | |
1193 | static inline __be32 nla_get_in_addr(const struct nlattr *nla) | |
1194 | { | |
1195 | return *(__be32 *) nla_data(nla); | |
1196 | } | |
1197 | ||
1198 | /** | |
1199 | * nla_get_in6_addr - return payload of IPv6 address attribute | |
1200 | * @nla: IPv6 address netlink attribute | |
1201 | */ | |
1202 | static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla) | |
1203 | { | |
1204 | struct in6_addr tmp; | |
1205 | ||
1206 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1207 | return tmp; | |
1208 | } | |
1209 | ||
64c83d83 JHS |
1210 | /** |
1211 | * nla_get_bitfield32 - return payload of 32 bitfield attribute | |
1212 | * @nla: nla_bitfield32 attribute | |
1213 | */ | |
1214 | static inline struct nla_bitfield32 nla_get_bitfield32(const struct nlattr *nla) | |
1215 | { | |
1216 | struct nla_bitfield32 tmp; | |
1217 | ||
1218 | nla_memcpy(&tmp, nla, sizeof(tmp)); | |
1219 | return tmp; | |
1220 | } | |
1221 | ||
b15ca182 TG |
1222 | /** |
1223 | * nla_memdup - duplicate attribute memory (kmemdup) | |
1224 | * @src: netlink attribute to duplicate from | |
1225 | * @gfp: GFP mask | |
1226 | */ | |
1227 | static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp) | |
1228 | { | |
1229 | return kmemdup(nla_data(src), nla_len(src), gfp); | |
1230 | } | |
1231 | ||
bfa83a9e TG |
1232 | /** |
1233 | * nla_nest_start - Start a new level of nested attributes | |
1234 | * @skb: socket buffer to add attributes to | |
1235 | * @attrtype: attribute type of container | |
1236 | * | |
1237 | * Returns the container attribute | |
1238 | */ | |
1239 | static inline struct nlattr *nla_nest_start(struct sk_buff *skb, int attrtype) | |
1240 | { | |
27a884dc | 1241 | struct nlattr *start = (struct nlattr *)skb_tail_pointer(skb); |
bfa83a9e TG |
1242 | |
1243 | if (nla_put(skb, attrtype, 0, NULL) < 0) | |
1244 | return NULL; | |
1245 | ||
1246 | return start; | |
1247 | } | |
1248 | ||
1249 | /** | |
1250 | * nla_nest_end - Finalize nesting of attributes | |
d1ec3b77 | 1251 | * @skb: socket buffer the attributes are stored in |
bfa83a9e TG |
1252 | * @start: container attribute |
1253 | * | |
1254 | * Corrects the container attribute header to include the all | |
1255 | * appeneded attributes. | |
1256 | * | |
1257 | * Returns the total data length of the skb. | |
1258 | */ | |
1259 | static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) | |
1260 | { | |
27a884dc | 1261 | start->nla_len = skb_tail_pointer(skb) - (unsigned char *)start; |
bfa83a9e TG |
1262 | return skb->len; |
1263 | } | |
1264 | ||
1265 | /** | |
1266 | * nla_nest_cancel - Cancel nesting of attributes | |
1267 | * @skb: socket buffer the message is stored in | |
1268 | * @start: container attribute | |
1269 | * | |
1270 | * Removes the container attribute and including all nested | |
bc3ed28c | 1271 | * attributes. Returns -EMSGSIZE |
bfa83a9e | 1272 | */ |
bc3ed28c | 1273 | static inline void nla_nest_cancel(struct sk_buff *skb, struct nlattr *start) |
bfa83a9e | 1274 | { |
bc3ed28c | 1275 | nlmsg_trim(skb, start); |
bfa83a9e TG |
1276 | } |
1277 | ||
4fe5d5c0 PM |
1278 | /** |
1279 | * nla_validate_nested - Validate a stream of nested attributes | |
1280 | * @start: container attribute | |
1281 | * @maxtype: maximum attribute type to be expected | |
1282 | * @policy: validation policy | |
fceb6435 | 1283 | * @extack: extended ACK report struct |
4fe5d5c0 PM |
1284 | * |
1285 | * Validates all attributes in the nested attribute stream against the | |
1286 | * specified policy. Attributes with a type exceeding maxtype will be | |
1287 | * ignored. See documenation of struct nla_policy for more details. | |
1288 | * | |
1289 | * Returns 0 on success or a negative error code. | |
1290 | */ | |
3654654f | 1291 | static inline int nla_validate_nested(const struct nlattr *start, int maxtype, |
fceb6435 JB |
1292 | const struct nla_policy *policy, |
1293 | struct netlink_ext_ack *extack) | |
4fe5d5c0 | 1294 | { |
fceb6435 JB |
1295 | return nla_validate(nla_data(start), nla_len(start), maxtype, policy, |
1296 | extack); | |
4fe5d5c0 PM |
1297 | } |
1298 | ||
089bf1a6 ND |
1299 | /** |
1300 | * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute | |
1301 | * @skb: socket buffer the message is stored in | |
1302 | * | |
1303 | * Return true if padding is needed to align the next attribute (nla_data()) to | |
1304 | * a 64-bit aligned area. | |
1305 | */ | |
1306 | static inline bool nla_need_padding_for_64bit(struct sk_buff *skb) | |
1307 | { | |
1308 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS | |
1309 | /* The nlattr header is 4 bytes in size, that's why we test | |
1310 | * if the skb->data _is_ aligned. A NOP attribute, plus | |
1311 | * nlattr header for next attribute, will make nla_data() | |
1312 | * 8-byte aligned. | |
1313 | */ | |
1314 | if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb), 8)) | |
1315 | return true; | |
1316 | #endif | |
1317 | return false; | |
1318 | } | |
1319 | ||
35c58459 DM |
1320 | /** |
1321 | * nla_align_64bit - 64-bit align the nla_data() of next attribute | |
1322 | * @skb: socket buffer the message is stored in | |
1323 | * @padattr: attribute type for the padding | |
1324 | * | |
1325 | * Conditionally emit a padding netlink attribute in order to make | |
1326 | * the next attribute we emit have a 64-bit aligned nla_data() area. | |
1327 | * This will only be done in architectures which do not have | |
cca1d815 | 1328 | * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined. |
35c58459 DM |
1329 | * |
1330 | * Returns zero on success or a negative error code. | |
1331 | */ | |
1332 | static inline int nla_align_64bit(struct sk_buff *skb, int padattr) | |
1333 | { | |
089bf1a6 | 1334 | if (nla_need_padding_for_64bit(skb) && |
cca1d815 ED |
1335 | !nla_reserve(skb, padattr, 0)) |
1336 | return -EMSGSIZE; | |
089bf1a6 | 1337 | |
35c58459 DM |
1338 | return 0; |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * nla_total_size_64bit - total length of attribute including padding | |
1343 | * @payload: length of payload | |
1344 | */ | |
1345 | static inline int nla_total_size_64bit(int payload) | |
1346 | { | |
1347 | return NLA_ALIGN(nla_attr_size(payload)) | |
cca1d815 | 1348 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
35c58459 DM |
1349 | + NLA_ALIGN(nla_attr_size(0)) |
1350 | #endif | |
1351 | ; | |
1352 | } | |
1353 | ||
bfa83a9e TG |
1354 | /** |
1355 | * nla_for_each_attr - iterate over a stream of attributes | |
1356 | * @pos: loop counter, set to current attribute | |
1357 | * @head: head of attribute stream | |
1358 | * @len: length of attribute stream | |
1359 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1360 | */ | |
1361 | #define nla_for_each_attr(pos, head, len, rem) \ | |
1362 | for (pos = head, rem = len; \ | |
1363 | nla_ok(pos, rem); \ | |
1364 | pos = nla_next(pos, &(rem))) | |
1365 | ||
fe4944e5 TG |
1366 | /** |
1367 | * nla_for_each_nested - iterate over nested attributes | |
1368 | * @pos: loop counter, set to current attribute | |
1369 | * @nla: attribute containing the nested attributes | |
1370 | * @rem: initialized to len, holds bytes currently remaining in stream | |
1371 | */ | |
1372 | #define nla_for_each_nested(pos, nla, rem) \ | |
1373 | nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem) | |
1374 | ||
941d8ebc SH |
1375 | /** |
1376 | * nla_is_last - Test if attribute is last in stream | |
1377 | * @nla: attribute to test | |
1378 | * @rem: bytes remaining in stream | |
1379 | */ | |
1380 | static inline bool nla_is_last(const struct nlattr *nla, int rem) | |
1381 | { | |
1382 | return nla->nla_len == rem; | |
1383 | } | |
1384 | ||
bfa83a9e | 1385 | #endif |