]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/net/netlink.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __NET_NETLINK_H
3 #define __NET_NETLINK_H
5 #include <linux/types.h>
6 #include <linux/netlink.h>
7 #include <linux/jiffies.h>
10 /* ========================================================================
11 * Netlink Messages and Attributes Interface (As Seen On TV)
12 * ------------------------------------------------------------------------
14 * ------------------------------------------------------------------------
17 * <--- nlmsg_total_size(payload) --->
18 * <-- nlmsg_msg_size(payload) ->
19 * +----------+- - -+-------------+- - -+-------- - -
20 * | nlmsghdr | Pad | Payload | Pad | nlmsghdr
21 * +----------+- - -+-------------+- - -+-------- - -
22 * nlmsg_data(nlh)---^ ^
23 * nlmsg_next(nlh)-----------------------+
26 * <---------------------- nlmsg_len(nlh) --------------------->
27 * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) ->
28 * +----------------------+- - -+--------------------------------+
29 * | Family Header | Pad | Attributes |
30 * +----------------------+- - -+--------------------------------+
31 * nlmsg_attrdata(nlh, hdrlen)---^
34 * struct nlmsghdr netlink message header
36 * Message Construction:
37 * nlmsg_new() create a new netlink message
38 * nlmsg_put() add a netlink message to an skb
39 * nlmsg_put_answer() callback based nlmsg_put()
40 * nlmsg_end() finalize netlink message
41 * nlmsg_get_pos() return current position in message
42 * nlmsg_trim() trim part of message
43 * nlmsg_cancel() cancel message construction
44 * nlmsg_free() free a netlink message
47 * nlmsg_multicast() multicast message to several groups
48 * nlmsg_unicast() unicast a message to a single socket
49 * nlmsg_notify() send notification message
51 * Message Length Calculations:
52 * nlmsg_msg_size(payload) length of message w/o padding
53 * nlmsg_total_size(payload) length of message w/ padding
54 * nlmsg_padlen(payload) length of padding at tail
56 * Message Payload Access:
57 * nlmsg_data(nlh) head of message payload
58 * nlmsg_len(nlh) length of message payload
59 * nlmsg_attrdata(nlh, hdrlen) head of attributes data
60 * nlmsg_attrlen(nlh, hdrlen) length of attributes data
63 * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes?
64 * nlmsg_next(nlh, remaining) get next netlink message
65 * nlmsg_parse() parse attributes of a message
66 * nlmsg_find_attr() find an attribute in a message
67 * nlmsg_for_each_msg() loop over all messages
68 * nlmsg_validate() validate netlink message incl. attrs
69 * nlmsg_for_each_attr() loop over all attributes
72 * nlmsg_report() report back to application?
74 * ------------------------------------------------------------------------
75 * Attributes Interface
76 * ------------------------------------------------------------------------
79 * <------- nla_total_size(payload) ------->
80 * <---- nla_attr_size(payload) ----->
81 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
82 * | Header | Pad | Payload | Pad | Header
83 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
84 * <- nla_len(nla) -> ^
85 * nla_data(nla)----^ |
86 * nla_next(nla)-----------------------------'
89 * struct nlattr netlink attribute header
91 * Attribute Construction:
92 * nla_reserve(skb, type, len) reserve room for an attribute
93 * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr
94 * nla_put(skb, type, len, data) add attribute to skb
95 * nla_put_nohdr(skb, len, data) add attribute w/o hdr
96 * nla_append(skb, len, data) append data to skb
98 * Attribute Construction for Basic Types:
99 * nla_put_u8(skb, type, value) add u8 attribute to skb
100 * nla_put_u16(skb, type, value) add u16 attribute to skb
101 * nla_put_u32(skb, type, value) add u32 attribute to skb
102 * nla_put_u64_64bit(skb, type,
103 * value, padattr) add u64 attribute to skb
104 * nla_put_s8(skb, type, value) add s8 attribute to skb
105 * nla_put_s16(skb, type, value) add s16 attribute to skb
106 * nla_put_s32(skb, type, value) add s32 attribute to skb
107 * nla_put_s64(skb, type, value,
108 * padattr) add s64 attribute to skb
109 * nla_put_string(skb, type, str) add string attribute to skb
110 * nla_put_flag(skb, type) add flag attribute to skb
111 * nla_put_msecs(skb, type, jiffies,
112 * padattr) add msecs attribute to skb
113 * nla_put_in_addr(skb, type, addr) add IPv4 address attribute to skb
114 * nla_put_in6_addr(skb, type, addr) add IPv6 address attribute to skb
116 * Nested Attributes Construction:
117 * nla_nest_start(skb, type) start a nested attribute
118 * nla_nest_end(skb, nla) finalize a nested attribute
119 * nla_nest_cancel(skb, nla) cancel nested attribute construction
121 * Attribute Length Calculations:
122 * nla_attr_size(payload) length of attribute w/o padding
123 * nla_total_size(payload) length of attribute w/ padding
124 * nla_padlen(payload) length of padding
126 * Attribute Payload Access:
127 * nla_data(nla) head of attribute payload
128 * nla_len(nla) length of attribute payload
130 * Attribute Payload Access for Basic Types:
131 * nla_get_u8(nla) get payload for a u8 attribute
132 * nla_get_u16(nla) get payload for a u16 attribute
133 * nla_get_u32(nla) get payload for a u32 attribute
134 * nla_get_u64(nla) get payload for a u64 attribute
135 * nla_get_s8(nla) get payload for a s8 attribute
136 * nla_get_s16(nla) get payload for a s16 attribute
137 * nla_get_s32(nla) get payload for a s32 attribute
138 * nla_get_s64(nla) get payload for a s64 attribute
139 * nla_get_flag(nla) return 1 if flag is true
140 * nla_get_msecs(nla) get payload for a msecs attribute
143 * nla_memcpy(dest, nla, count) copy attribute into memory
144 * nla_memcmp(nla, data, size) compare attribute with memory area
145 * nla_strlcpy(dst, nla, size) copy attribute to a sized string
146 * nla_strcmp(nla, str) compare attribute with string
149 * nla_ok(nla, remaining) does nla fit into remaining bytes?
150 * nla_next(nla, remaining) get next netlink attribute
151 * nla_validate() validate a stream of attributes
152 * nla_validate_nested() validate a stream of nested attributes
153 * nla_find() find attribute in stream of attributes
154 * nla_find_nested() find attribute in nested attributes
155 * nla_parse() parse and validate stream of attrs
156 * nla_parse_nested() parse nested attributes
157 * nla_for_each_attr() loop over all attributes
158 * nla_for_each_nested() loop over the nested attributes
159 *=========================================================================
163 * Standard attribute types to specify validation policy
189 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
191 enum nla_policy_validation
{
196 NLA_VALIDATE_FUNCTION
,
200 * struct nla_policy - attribute validation policy
201 * @type: Type of attribute or NLA_UNSPEC
202 * @validation_type: type of attribute validation done in addition to
203 * type-specific validation (e.g. range, function call), see
204 * &enum nla_policy_validation
205 * @len: Type specific length of payload
207 * Policies are defined as arrays of this struct, the array must be
208 * accessible by attribute type up to the highest identifier to be expected.
210 * Meaning of `len' field:
211 * NLA_STRING Maximum length of string
212 * NLA_NUL_STRING Maximum length of string (excluding NUL)
214 * NLA_BINARY Maximum length of attribute payload
216 * NLA_NESTED_ARRAY Length verification is done by checking len of
217 * nested header (or empty); len field is used if
218 * validation_data is also used, for the max attr
219 * number in the nested policy.
224 * NLA_MSECS Leaving the length field zero will verify the
225 * given type fits, using it verifies minimum length
226 * just like "All other"
227 * NLA_BITFIELD32 Unused
229 * NLA_EXACT_LEN Attribute must have exactly this length, otherwise
231 * NLA_EXACT_LEN_WARN Attribute should have exactly this length, a warning
232 * is logged if it is longer, shorter is rejected.
233 * All other Minimum length of attribute payload
235 * Meaning of `validation_data' field:
236 * NLA_BITFIELD32 This is a 32-bit bitmap/bitselector attribute and
237 * validation data must point to a u32 value of valid
239 * NLA_REJECT This attribute is always rejected and validation data
240 * may point to a string to report as the error instead
241 * of the generic one in extended ACK.
242 * NLA_NESTED Points to a nested policy to validate, must also set
243 * `len' to the max attribute number.
244 * Note that nla_parse() will validate, but of course not
245 * parse, the nested sub-policies.
246 * NLA_NESTED_ARRAY Points to a nested policy to validate, must also set
247 * `len' to the max attribute number. The difference to
248 * NLA_NESTED is the structure - NLA_NESTED has the
249 * nested attributes directly inside, while an array has
250 * the nested attributes at another level down and the
251 * attributes directly in the nesting don't matter.
252 * All other Unused - but note that it's a union
254 * Meaning of `min' and `max' fields, use via NLA_POLICY_MIN, NLA_POLICY_MAX
255 * and NLA_POLICY_RANGE:
263 * NLA_S64 These are used depending on the validation_type
264 * field, if that is min/max/range then the minimum,
265 * maximum and both are used (respectively) to check
266 * the value of the integer attribute.
267 * Note that in the interest of code simplicity and
268 * struct size both limits are s16, so you cannot
269 * enforce a range that doesn't fall within the range
270 * of s16 - do that as usual in the code instead.
271 * All other Unused - but note that it's a union
273 * Meaning of `validate' field, use via NLA_POLICY_VALIDATE_FN:
274 * NLA_BINARY Validation function called for the attribute,
275 * not compatible with use of the validation_data
276 * as in NLA_BITFIELD32, NLA_REJECT, NLA_NESTED and
278 * All other Unused - but note that it's a union
281 * static const struct nla_policy my_policy[ATTR_MAX+1] = {
282 * [ATTR_FOO] = { .type = NLA_U16 },
283 * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
284 * [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
285 * [ATTR_GOO] = { .type = NLA_BITFIELD32, .validation_data = &myvalidflags },
293 const void *validation_data
;
297 int (*validate
)(const struct nlattr
*attr
,
298 struct netlink_ext_ack
*extack
);
302 #define NLA_POLICY_EXACT_LEN(_len) { .type = NLA_EXACT_LEN, .len = _len }
303 #define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \
306 #define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN)
307 #define NLA_POLICY_ETH_ADDR_COMPAT NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)
309 #define _NLA_POLICY_NESTED(maxattr, policy) \
310 { .type = NLA_NESTED, .validation_data = policy, .len = maxattr }
311 #define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
312 { .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr }
313 #define NLA_POLICY_NESTED(policy) \
314 _NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
315 #define NLA_POLICY_NESTED_ARRAY(policy) \
316 _NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
318 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
319 #define NLA_ENSURE_INT_TYPE(tp) \
320 (__NLA_ENSURE(tp == NLA_S8 || tp == NLA_U8 || \
321 tp == NLA_S16 || tp == NLA_U16 || \
322 tp == NLA_S32 || tp == NLA_U32 || \
323 tp == NLA_S64 || tp == NLA_U64) + tp)
324 #define NLA_ENSURE_NO_VALIDATION_PTR(tp) \
325 (__NLA_ENSURE(tp != NLA_BITFIELD32 && \
326 tp != NLA_REJECT && \
327 tp != NLA_NESTED && \
328 tp != NLA_NESTED_ARRAY) + tp)
330 #define NLA_POLICY_RANGE(tp, _min, _max) { \
331 .type = NLA_ENSURE_INT_TYPE(tp), \
332 .validation_type = NLA_VALIDATE_RANGE, \
337 #define NLA_POLICY_MIN(tp, _min) { \
338 .type = NLA_ENSURE_INT_TYPE(tp), \
339 .validation_type = NLA_VALIDATE_MIN, \
343 #define NLA_POLICY_MAX(tp, _max) { \
344 .type = NLA_ENSURE_INT_TYPE(tp), \
345 .validation_type = NLA_VALIDATE_MAX, \
349 #define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \
350 .type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \
351 .validation_type = NLA_VALIDATE_FUNCTION, \
353 .len = __VA_ARGS__ + 0, \
357 * struct nl_info - netlink source information
358 * @nlh: Netlink message header of original request
359 * @portid: Netlink PORTID of requesting application
362 struct nlmsghdr
*nlh
;
368 int netlink_rcv_skb(struct sk_buff
*skb
,
369 int (*cb
)(struct sk_buff
*, struct nlmsghdr
*,
370 struct netlink_ext_ack
*));
371 int nlmsg_notify(struct sock
*sk
, struct sk_buff
*skb
, u32 portid
,
372 unsigned int group
, int report
, gfp_t flags
);
374 int nla_validate(const struct nlattr
*head
, int len
, int maxtype
,
375 const struct nla_policy
*policy
,
376 struct netlink_ext_ack
*extack
);
377 int nla_parse(struct nlattr
**tb
, int maxtype
, const struct nlattr
*head
,
378 int len
, const struct nla_policy
*policy
,
379 struct netlink_ext_ack
*extack
);
380 int nla_parse_strict(struct nlattr
**tb
, int maxtype
, const struct nlattr
*head
,
381 int len
, const struct nla_policy
*policy
,
382 struct netlink_ext_ack
*extack
);
383 int nla_policy_len(const struct nla_policy
*, int);
384 struct nlattr
*nla_find(const struct nlattr
*head
, int len
, int attrtype
);
385 size_t nla_strlcpy(char *dst
, const struct nlattr
*nla
, size_t dstsize
);
386 char *nla_strdup(const struct nlattr
*nla
, gfp_t flags
);
387 int nla_memcpy(void *dest
, const struct nlattr
*src
, int count
);
388 int nla_memcmp(const struct nlattr
*nla
, const void *data
, size_t size
);
389 int nla_strcmp(const struct nlattr
*nla
, const char *str
);
390 struct nlattr
*__nla_reserve(struct sk_buff
*skb
, int attrtype
, int attrlen
);
391 struct nlattr
*__nla_reserve_64bit(struct sk_buff
*skb
, int attrtype
,
392 int attrlen
, int padattr
);
393 void *__nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
394 struct nlattr
*nla_reserve(struct sk_buff
*skb
, int attrtype
, int attrlen
);
395 struct nlattr
*nla_reserve_64bit(struct sk_buff
*skb
, int attrtype
,
396 int attrlen
, int padattr
);
397 void *nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
398 void __nla_put(struct sk_buff
*skb
, int attrtype
, int attrlen
,
400 void __nla_put_64bit(struct sk_buff
*skb
, int attrtype
, int attrlen
,
401 const void *data
, int padattr
);
402 void __nla_put_nohdr(struct sk_buff
*skb
, int attrlen
, const void *data
);
403 int nla_put(struct sk_buff
*skb
, int attrtype
, int attrlen
, const void *data
);
404 int nla_put_64bit(struct sk_buff
*skb
, int attrtype
, int attrlen
,
405 const void *data
, int padattr
);
406 int nla_put_nohdr(struct sk_buff
*skb
, int attrlen
, const void *data
);
407 int nla_append(struct sk_buff
*skb
, int attrlen
, const void *data
);
409 /**************************************************************************
411 **************************************************************************/
414 * nlmsg_msg_size - length of netlink message not including padding
415 * @payload: length of message payload
417 static inline int nlmsg_msg_size(int payload
)
419 return NLMSG_HDRLEN
+ payload
;
423 * nlmsg_total_size - length of netlink message including padding
424 * @payload: length of message payload
426 static inline int nlmsg_total_size(int payload
)
428 return NLMSG_ALIGN(nlmsg_msg_size(payload
));
432 * nlmsg_padlen - length of padding at the message's tail
433 * @payload: length of message payload
435 static inline int nlmsg_padlen(int payload
)
437 return nlmsg_total_size(payload
) - nlmsg_msg_size(payload
);
441 * nlmsg_data - head of message payload
442 * @nlh: netlink message header
444 static inline void *nlmsg_data(const struct nlmsghdr
*nlh
)
446 return (unsigned char *) nlh
+ NLMSG_HDRLEN
;
450 * nlmsg_len - length of message payload
451 * @nlh: netlink message header
453 static inline int nlmsg_len(const struct nlmsghdr
*nlh
)
455 return nlh
->nlmsg_len
- NLMSG_HDRLEN
;
459 * nlmsg_attrdata - head of attributes data
460 * @nlh: netlink message header
461 * @hdrlen: length of family specific header
463 static inline struct nlattr
*nlmsg_attrdata(const struct nlmsghdr
*nlh
,
466 unsigned char *data
= nlmsg_data(nlh
);
467 return (struct nlattr
*) (data
+ NLMSG_ALIGN(hdrlen
));
471 * nlmsg_attrlen - length of attributes data
472 * @nlh: netlink message header
473 * @hdrlen: length of family specific header
475 static inline int nlmsg_attrlen(const struct nlmsghdr
*nlh
, int hdrlen
)
477 return nlmsg_len(nlh
) - NLMSG_ALIGN(hdrlen
);
481 * nlmsg_ok - check if the netlink message fits into the remaining bytes
482 * @nlh: netlink message header
483 * @remaining: number of bytes remaining in message stream
485 static inline int nlmsg_ok(const struct nlmsghdr
*nlh
, int remaining
)
487 return (remaining
>= (int) sizeof(struct nlmsghdr
) &&
488 nlh
->nlmsg_len
>= sizeof(struct nlmsghdr
) &&
489 nlh
->nlmsg_len
<= remaining
);
493 * nlmsg_next - next netlink message in message stream
494 * @nlh: netlink message header
495 * @remaining: number of bytes remaining in message stream
497 * Returns the next netlink message in the message stream and
498 * decrements remaining by the size of the current message.
500 static inline struct nlmsghdr
*
501 nlmsg_next(const struct nlmsghdr
*nlh
, int *remaining
)
503 int totlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
505 *remaining
-= totlen
;
507 return (struct nlmsghdr
*) ((unsigned char *) nlh
+ totlen
);
511 * nlmsg_parse - parse attributes of a netlink message
512 * @nlh: netlink message header
513 * @hdrlen: length of family specific header
514 * @tb: destination array with maxtype+1 elements
515 * @maxtype: maximum attribute type to be expected
516 * @policy: validation policy
517 * @extack: extended ACK report struct
521 static inline int nlmsg_parse(const struct nlmsghdr
*nlh
, int hdrlen
,
522 struct nlattr
*tb
[], int maxtype
,
523 const struct nla_policy
*policy
,
524 struct netlink_ext_ack
*extack
)
526 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
)) {
527 NL_SET_ERR_MSG(extack
, "Invalid header length");
531 return nla_parse(tb
, maxtype
, nlmsg_attrdata(nlh
, hdrlen
),
532 nlmsg_attrlen(nlh
, hdrlen
), policy
, extack
);
535 static inline int nlmsg_parse_strict(const struct nlmsghdr
*nlh
, int hdrlen
,
536 struct nlattr
*tb
[], int maxtype
,
537 const struct nla_policy
*policy
,
538 struct netlink_ext_ack
*extack
)
540 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
)) {
541 NL_SET_ERR_MSG(extack
, "Invalid header length");
545 return nla_parse_strict(tb
, maxtype
, nlmsg_attrdata(nlh
, hdrlen
),
546 nlmsg_attrlen(nlh
, hdrlen
), policy
, extack
);
550 * nlmsg_find_attr - find a specific attribute in a netlink message
551 * @nlh: netlink message header
552 * @hdrlen: length of familiy specific header
553 * @attrtype: type of attribute to look for
555 * Returns the first attribute which matches the specified type.
557 static inline struct nlattr
*nlmsg_find_attr(const struct nlmsghdr
*nlh
,
558 int hdrlen
, int attrtype
)
560 return nla_find(nlmsg_attrdata(nlh
, hdrlen
),
561 nlmsg_attrlen(nlh
, hdrlen
), attrtype
);
565 * nlmsg_validate - validate a netlink message including attributes
566 * @nlh: netlinket message header
567 * @hdrlen: length of familiy specific header
568 * @maxtype: maximum attribute type to be expected
569 * @policy: validation policy
570 * @extack: extended ACK report struct
572 static inline int nlmsg_validate(const struct nlmsghdr
*nlh
,
573 int hdrlen
, int maxtype
,
574 const struct nla_policy
*policy
,
575 struct netlink_ext_ack
*extack
)
577 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
))
580 return nla_validate(nlmsg_attrdata(nlh
, hdrlen
),
581 nlmsg_attrlen(nlh
, hdrlen
), maxtype
, policy
,
586 * nlmsg_report - need to report back to application?
587 * @nlh: netlink message header
589 * Returns 1 if a report back to the application is requested.
591 static inline int nlmsg_report(const struct nlmsghdr
*nlh
)
593 return !!(nlh
->nlmsg_flags
& NLM_F_ECHO
);
597 * nlmsg_for_each_attr - iterate over a stream of attributes
598 * @pos: loop counter, set to current attribute
599 * @nlh: netlink message header
600 * @hdrlen: length of familiy specific header
601 * @rem: initialized to len, holds bytes currently remaining in stream
603 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
604 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
605 nlmsg_attrlen(nlh, hdrlen), rem)
608 * nlmsg_put - Add a new netlink message to an skb
609 * @skb: socket buffer to store message in
610 * @portid: netlink PORTID of requesting application
611 * @seq: sequence number of message
612 * @type: message type
613 * @payload: length of message payload
614 * @flags: message flags
616 * Returns NULL if the tailroom of the skb is insufficient to store
617 * the message header and payload.
619 static inline struct nlmsghdr
*nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
,
620 int type
, int payload
, int flags
)
622 if (unlikely(skb_tailroom(skb
) < nlmsg_total_size(payload
)))
625 return __nlmsg_put(skb
, portid
, seq
, type
, payload
, flags
);
629 * nlmsg_put_answer - Add a new callback based netlink message to an skb
630 * @skb: socket buffer to store message in
631 * @cb: netlink callback
632 * @type: message type
633 * @payload: length of message payload
634 * @flags: message flags
636 * Returns NULL if the tailroom of the skb is insufficient to store
637 * the message header and payload.
639 static inline struct nlmsghdr
*nlmsg_put_answer(struct sk_buff
*skb
,
640 struct netlink_callback
*cb
,
641 int type
, int payload
,
644 return nlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
645 type
, payload
, flags
);
649 * nlmsg_new - Allocate a new netlink message
650 * @payload: size of the message payload
651 * @flags: the type of memory to allocate.
653 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
654 * and a good default is needed.
656 static inline struct sk_buff
*nlmsg_new(size_t payload
, gfp_t flags
)
658 return alloc_skb(nlmsg_total_size(payload
), flags
);
662 * nlmsg_end - Finalize a netlink message
663 * @skb: socket buffer the message is stored in
664 * @nlh: netlink message header
666 * Corrects the netlink message header to include the appeneded
667 * attributes. Only necessary if attributes have been added to
670 static inline void nlmsg_end(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
672 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - (unsigned char *)nlh
;
676 * nlmsg_get_pos - return current position in netlink message
677 * @skb: socket buffer the message is stored in
679 * Returns a pointer to the current tail of the message.
681 static inline void *nlmsg_get_pos(struct sk_buff
*skb
)
683 return skb_tail_pointer(skb
);
687 * nlmsg_trim - Trim message to a mark
688 * @skb: socket buffer the message is stored in
689 * @mark: mark to trim to
691 * Trims the message to the provided mark.
693 static inline void nlmsg_trim(struct sk_buff
*skb
, const void *mark
)
696 WARN_ON((unsigned char *) mark
< skb
->data
);
697 skb_trim(skb
, (unsigned char *) mark
- skb
->data
);
702 * nlmsg_cancel - Cancel construction of a netlink message
703 * @skb: socket buffer the message is stored in
704 * @nlh: netlink message header
706 * Removes the complete netlink message including all
707 * attributes from the socket buffer again.
709 static inline void nlmsg_cancel(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
711 nlmsg_trim(skb
, nlh
);
715 * nlmsg_free - free a netlink message
716 * @skb: socket buffer of netlink message
718 static inline void nlmsg_free(struct sk_buff
*skb
)
724 * nlmsg_multicast - multicast a netlink message
725 * @sk: netlink socket to spread messages to
726 * @skb: netlink message as socket buffer
727 * @portid: own netlink portid to avoid sending to yourself
728 * @group: multicast group id
729 * @flags: allocation flags
731 static inline int nlmsg_multicast(struct sock
*sk
, struct sk_buff
*skb
,
732 u32 portid
, unsigned int group
, gfp_t flags
)
736 NETLINK_CB(skb
).dst_group
= group
;
738 err
= netlink_broadcast(sk
, skb
, portid
, group
, flags
);
746 * nlmsg_unicast - unicast a netlink message
747 * @sk: netlink socket to spread message to
748 * @skb: netlink message as socket buffer
749 * @portid: netlink portid of the destination socket
751 static inline int nlmsg_unicast(struct sock
*sk
, struct sk_buff
*skb
, u32 portid
)
755 err
= netlink_unicast(sk
, skb
, portid
, MSG_DONTWAIT
);
763 * nlmsg_for_each_msg - iterate over a stream of messages
764 * @pos: loop counter, set to current message
765 * @head: head of message stream
766 * @len: length of message stream
767 * @rem: initialized to len, holds bytes currently remaining in stream
769 #define nlmsg_for_each_msg(pos, head, len, rem) \
770 for (pos = head, rem = len; \
771 nlmsg_ok(pos, rem); \
772 pos = nlmsg_next(pos, &(rem)))
775 * nl_dump_check_consistent - check if sequence is consistent and advertise if not
776 * @cb: netlink callback structure that stores the sequence number
777 * @nlh: netlink message header to write the flag to
779 * This function checks if the sequence (generation) number changed during dump
780 * and if it did, advertises it in the netlink message header.
782 * The correct way to use it is to set cb->seq to the generation counter when
783 * all locks for dumping have been acquired, and then call this function for
784 * each message that is generated.
786 * Note that due to initialisation concerns, 0 is an invalid sequence number
787 * and must not be used by code that uses this functionality.
790 nl_dump_check_consistent(struct netlink_callback
*cb
,
791 struct nlmsghdr
*nlh
)
793 if (cb
->prev_seq
&& cb
->seq
!= cb
->prev_seq
)
794 nlh
->nlmsg_flags
|= NLM_F_DUMP_INTR
;
795 cb
->prev_seq
= cb
->seq
;
798 /**************************************************************************
800 **************************************************************************/
803 * nla_attr_size - length of attribute not including padding
804 * @payload: length of payload
806 static inline int nla_attr_size(int payload
)
808 return NLA_HDRLEN
+ payload
;
812 * nla_total_size - total length of attribute including padding
813 * @payload: length of payload
815 static inline int nla_total_size(int payload
)
817 return NLA_ALIGN(nla_attr_size(payload
));
821 * nla_padlen - length of padding at the tail of attribute
822 * @payload: length of payload
824 static inline int nla_padlen(int payload
)
826 return nla_total_size(payload
) - nla_attr_size(payload
);
830 * nla_type - attribute type
831 * @nla: netlink attribute
833 static inline int nla_type(const struct nlattr
*nla
)
835 return nla
->nla_type
& NLA_TYPE_MASK
;
839 * nla_data - head of payload
840 * @nla: netlink attribute
842 static inline void *nla_data(const struct nlattr
*nla
)
844 return (char *) nla
+ NLA_HDRLEN
;
848 * nla_len - length of payload
849 * @nla: netlink attribute
851 static inline int nla_len(const struct nlattr
*nla
)
853 return nla
->nla_len
- NLA_HDRLEN
;
857 * nla_ok - check if the netlink attribute fits into the remaining bytes
858 * @nla: netlink attribute
859 * @remaining: number of bytes remaining in attribute stream
861 static inline int nla_ok(const struct nlattr
*nla
, int remaining
)
863 return remaining
>= (int) sizeof(*nla
) &&
864 nla
->nla_len
>= sizeof(*nla
) &&
865 nla
->nla_len
<= remaining
;
869 * nla_next - next netlink attribute in attribute stream
870 * @nla: netlink attribute
871 * @remaining: number of bytes remaining in attribute stream
873 * Returns the next netlink attribute in the attribute stream and
874 * decrements remaining by the size of the current attribute.
876 static inline struct nlattr
*nla_next(const struct nlattr
*nla
, int *remaining
)
878 unsigned int totlen
= NLA_ALIGN(nla
->nla_len
);
880 *remaining
-= totlen
;
881 return (struct nlattr
*) ((char *) nla
+ totlen
);
885 * nla_find_nested - find attribute in a set of nested attributes
886 * @nla: attribute containing the nested attributes
887 * @attrtype: type of attribute to look for
889 * Returns the first attribute which matches the specified type.
891 static inline struct nlattr
*
892 nla_find_nested(const struct nlattr
*nla
, int attrtype
)
894 return nla_find(nla_data(nla
), nla_len(nla
), attrtype
);
898 * nla_parse_nested - parse nested attributes
899 * @tb: destination array with maxtype+1 elements
900 * @maxtype: maximum attribute type to be expected
901 * @nla: attribute containing the nested attributes
902 * @policy: validation policy
903 * @extack: extended ACK report struct
907 static inline int nla_parse_nested(struct nlattr
*tb
[], int maxtype
,
908 const struct nlattr
*nla
,
909 const struct nla_policy
*policy
,
910 struct netlink_ext_ack
*extack
)
912 return nla_parse(tb
, maxtype
, nla_data(nla
), nla_len(nla
), policy
,
917 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
918 * @skb: socket buffer to add attribute to
919 * @attrtype: attribute type
920 * @value: numeric value
922 static inline int nla_put_u8(struct sk_buff
*skb
, int attrtype
, u8 value
)
924 /* temporary variables to work around GCC PR81715 with asan-stack=1 */
927 return nla_put(skb
, attrtype
, sizeof(u8
), &tmp
);
931 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
932 * @skb: socket buffer to add attribute to
933 * @attrtype: attribute type
934 * @value: numeric value
936 static inline int nla_put_u16(struct sk_buff
*skb
, int attrtype
, u16 value
)
940 return nla_put(skb
, attrtype
, sizeof(u16
), &tmp
);
944 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
945 * @skb: socket buffer to add attribute to
946 * @attrtype: attribute type
947 * @value: numeric value
949 static inline int nla_put_be16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
953 return nla_put(skb
, attrtype
, sizeof(__be16
), &tmp
);
957 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
958 * @skb: socket buffer to add attribute to
959 * @attrtype: attribute type
960 * @value: numeric value
962 static inline int nla_put_net16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
966 return nla_put_be16(skb
, attrtype
| NLA_F_NET_BYTEORDER
, tmp
);
970 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
971 * @skb: socket buffer to add attribute to
972 * @attrtype: attribute type
973 * @value: numeric value
975 static inline int nla_put_le16(struct sk_buff
*skb
, int attrtype
, __le16 value
)
979 return nla_put(skb
, attrtype
, sizeof(__le16
), &tmp
);
983 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
984 * @skb: socket buffer to add attribute to
985 * @attrtype: attribute type
986 * @value: numeric value
988 static inline int nla_put_u32(struct sk_buff
*skb
, int attrtype
, u32 value
)
992 return nla_put(skb
, attrtype
, sizeof(u32
), &tmp
);
996 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
997 * @skb: socket buffer to add attribute to
998 * @attrtype: attribute type
999 * @value: numeric value
1001 static inline int nla_put_be32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
1005 return nla_put(skb
, attrtype
, sizeof(__be32
), &tmp
);
1009 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
1010 * @skb: socket buffer to add attribute to
1011 * @attrtype: attribute type
1012 * @value: numeric value
1014 static inline int nla_put_net32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
1018 return nla_put_be32(skb
, attrtype
| NLA_F_NET_BYTEORDER
, tmp
);
1022 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
1023 * @skb: socket buffer to add attribute to
1024 * @attrtype: attribute type
1025 * @value: numeric value
1027 static inline int nla_put_le32(struct sk_buff
*skb
, int attrtype
, __le32 value
)
1031 return nla_put(skb
, attrtype
, sizeof(__le32
), &tmp
);
1035 * nla_put_u64_64bit - Add a u64 netlink attribute to a skb and align it
1036 * @skb: socket buffer to add attribute to
1037 * @attrtype: attribute type
1038 * @value: numeric value
1039 * @padattr: attribute type for the padding
1041 static inline int nla_put_u64_64bit(struct sk_buff
*skb
, int attrtype
,
1042 u64 value
, int padattr
)
1046 return nla_put_64bit(skb
, attrtype
, sizeof(u64
), &tmp
, padattr
);
1050 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer and align it
1051 * @skb: socket buffer to add attribute to
1052 * @attrtype: attribute type
1053 * @value: numeric value
1054 * @padattr: attribute type for the padding
1056 static inline int nla_put_be64(struct sk_buff
*skb
, int attrtype
, __be64 value
,
1061 return nla_put_64bit(skb
, attrtype
, sizeof(__be64
), &tmp
, padattr
);
1065 * nla_put_net64 - Add 64-bit network byte order nlattr to a skb and align it
1066 * @skb: socket buffer to add attribute to
1067 * @attrtype: attribute type
1068 * @value: numeric value
1069 * @padattr: attribute type for the padding
1071 static inline int nla_put_net64(struct sk_buff
*skb
, int attrtype
, __be64 value
,
1076 return nla_put_be64(skb
, attrtype
| NLA_F_NET_BYTEORDER
, tmp
,
1081 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer and align it
1082 * @skb: socket buffer to add attribute to
1083 * @attrtype: attribute type
1084 * @value: numeric value
1085 * @padattr: attribute type for the padding
1087 static inline int nla_put_le64(struct sk_buff
*skb
, int attrtype
, __le64 value
,
1092 return nla_put_64bit(skb
, attrtype
, sizeof(__le64
), &tmp
, padattr
);
1096 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
1097 * @skb: socket buffer to add attribute to
1098 * @attrtype: attribute type
1099 * @value: numeric value
1101 static inline int nla_put_s8(struct sk_buff
*skb
, int attrtype
, s8 value
)
1105 return nla_put(skb
, attrtype
, sizeof(s8
), &tmp
);
1109 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
1110 * @skb: socket buffer to add attribute to
1111 * @attrtype: attribute type
1112 * @value: numeric value
1114 static inline int nla_put_s16(struct sk_buff
*skb
, int attrtype
, s16 value
)
1118 return nla_put(skb
, attrtype
, sizeof(s16
), &tmp
);
1122 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
1123 * @skb: socket buffer to add attribute to
1124 * @attrtype: attribute type
1125 * @value: numeric value
1127 static inline int nla_put_s32(struct sk_buff
*skb
, int attrtype
, s32 value
)
1131 return nla_put(skb
, attrtype
, sizeof(s32
), &tmp
);
1135 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer and align it
1136 * @skb: socket buffer to add attribute to
1137 * @attrtype: attribute type
1138 * @value: numeric value
1139 * @padattr: attribute type for the padding
1141 static inline int nla_put_s64(struct sk_buff
*skb
, int attrtype
, s64 value
,
1146 return nla_put_64bit(skb
, attrtype
, sizeof(s64
), &tmp
, padattr
);
1150 * nla_put_string - Add a string netlink attribute to a socket buffer
1151 * @skb: socket buffer to add attribute to
1152 * @attrtype: attribute type
1153 * @str: NUL terminated string
1155 static inline int nla_put_string(struct sk_buff
*skb
, int attrtype
,
1158 return nla_put(skb
, attrtype
, strlen(str
) + 1, str
);
1162 * nla_put_flag - Add a flag netlink attribute to a socket buffer
1163 * @skb: socket buffer to add attribute to
1164 * @attrtype: attribute type
1166 static inline int nla_put_flag(struct sk_buff
*skb
, int attrtype
)
1168 return nla_put(skb
, attrtype
, 0, NULL
);
1172 * nla_put_msecs - Add a msecs netlink attribute to a skb and align it
1173 * @skb: socket buffer to add attribute to
1174 * @attrtype: attribute type
1175 * @njiffies: number of jiffies to convert to msecs
1176 * @padattr: attribute type for the padding
1178 static inline int nla_put_msecs(struct sk_buff
*skb
, int attrtype
,
1179 unsigned long njiffies
, int padattr
)
1181 u64 tmp
= jiffies_to_msecs(njiffies
);
1183 return nla_put_64bit(skb
, attrtype
, sizeof(u64
), &tmp
, padattr
);
1187 * nla_put_in_addr - Add an IPv4 address netlink attribute to a socket
1189 * @skb: socket buffer to add attribute to
1190 * @attrtype: attribute type
1191 * @addr: IPv4 address
1193 static inline int nla_put_in_addr(struct sk_buff
*skb
, int attrtype
,
1198 return nla_put_be32(skb
, attrtype
, tmp
);
1202 * nla_put_in6_addr - Add an IPv6 address netlink attribute to a socket
1204 * @skb: socket buffer to add attribute to
1205 * @attrtype: attribute type
1206 * @addr: IPv6 address
1208 static inline int nla_put_in6_addr(struct sk_buff
*skb
, int attrtype
,
1209 const struct in6_addr
*addr
)
1211 return nla_put(skb
, attrtype
, sizeof(*addr
), addr
);
1215 * nla_get_u32 - return payload of u32 attribute
1216 * @nla: u32 netlink attribute
1218 static inline u32
nla_get_u32(const struct nlattr
*nla
)
1220 return *(u32
*) nla_data(nla
);
1224 * nla_get_be32 - return payload of __be32 attribute
1225 * @nla: __be32 netlink attribute
1227 static inline __be32
nla_get_be32(const struct nlattr
*nla
)
1229 return *(__be32
*) nla_data(nla
);
1233 * nla_get_le32 - return payload of __le32 attribute
1234 * @nla: __le32 netlink attribute
1236 static inline __le32
nla_get_le32(const struct nlattr
*nla
)
1238 return *(__le32
*) nla_data(nla
);
1242 * nla_get_u16 - return payload of u16 attribute
1243 * @nla: u16 netlink attribute
1245 static inline u16
nla_get_u16(const struct nlattr
*nla
)
1247 return *(u16
*) nla_data(nla
);
1251 * nla_get_be16 - return payload of __be16 attribute
1252 * @nla: __be16 netlink attribute
1254 static inline __be16
nla_get_be16(const struct nlattr
*nla
)
1256 return *(__be16
*) nla_data(nla
);
1260 * nla_get_le16 - return payload of __le16 attribute
1261 * @nla: __le16 netlink attribute
1263 static inline __le16
nla_get_le16(const struct nlattr
*nla
)
1265 return *(__le16
*) nla_data(nla
);
1269 * nla_get_u8 - return payload of u8 attribute
1270 * @nla: u8 netlink attribute
1272 static inline u8
nla_get_u8(const struct nlattr
*nla
)
1274 return *(u8
*) nla_data(nla
);
1278 * nla_get_u64 - return payload of u64 attribute
1279 * @nla: u64 netlink attribute
1281 static inline u64
nla_get_u64(const struct nlattr
*nla
)
1285 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1291 * nla_get_be64 - return payload of __be64 attribute
1292 * @nla: __be64 netlink attribute
1294 static inline __be64
nla_get_be64(const struct nlattr
*nla
)
1298 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1304 * nla_get_le64 - return payload of __le64 attribute
1305 * @nla: __le64 netlink attribute
1307 static inline __le64
nla_get_le64(const struct nlattr
*nla
)
1309 return *(__le64
*) nla_data(nla
);
1313 * nla_get_s32 - return payload of s32 attribute
1314 * @nla: s32 netlink attribute
1316 static inline s32
nla_get_s32(const struct nlattr
*nla
)
1318 return *(s32
*) nla_data(nla
);
1322 * nla_get_s16 - return payload of s16 attribute
1323 * @nla: s16 netlink attribute
1325 static inline s16
nla_get_s16(const struct nlattr
*nla
)
1327 return *(s16
*) nla_data(nla
);
1331 * nla_get_s8 - return payload of s8 attribute
1332 * @nla: s8 netlink attribute
1334 static inline s8
nla_get_s8(const struct nlattr
*nla
)
1336 return *(s8
*) nla_data(nla
);
1340 * nla_get_s64 - return payload of s64 attribute
1341 * @nla: s64 netlink attribute
1343 static inline s64
nla_get_s64(const struct nlattr
*nla
)
1347 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1353 * nla_get_flag - return payload of flag attribute
1354 * @nla: flag netlink attribute
1356 static inline int nla_get_flag(const struct nlattr
*nla
)
1362 * nla_get_msecs - return payload of msecs attribute
1363 * @nla: msecs netlink attribute
1365 * Returns the number of milliseconds in jiffies.
1367 static inline unsigned long nla_get_msecs(const struct nlattr
*nla
)
1369 u64 msecs
= nla_get_u64(nla
);
1371 return msecs_to_jiffies((unsigned long) msecs
);
1375 * nla_get_in_addr - return payload of IPv4 address attribute
1376 * @nla: IPv4 address netlink attribute
1378 static inline __be32
nla_get_in_addr(const struct nlattr
*nla
)
1380 return *(__be32
*) nla_data(nla
);
1384 * nla_get_in6_addr - return payload of IPv6 address attribute
1385 * @nla: IPv6 address netlink attribute
1387 static inline struct in6_addr
nla_get_in6_addr(const struct nlattr
*nla
)
1389 struct in6_addr tmp
;
1391 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1396 * nla_get_bitfield32 - return payload of 32 bitfield attribute
1397 * @nla: nla_bitfield32 attribute
1399 static inline struct nla_bitfield32
nla_get_bitfield32(const struct nlattr
*nla
)
1401 struct nla_bitfield32 tmp
;
1403 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1408 * nla_memdup - duplicate attribute memory (kmemdup)
1409 * @src: netlink attribute to duplicate from
1412 static inline void *nla_memdup(const struct nlattr
*src
, gfp_t gfp
)
1414 return kmemdup(nla_data(src
), nla_len(src
), gfp
);
1418 * nla_nest_start - Start a new level of nested attributes
1419 * @skb: socket buffer to add attributes to
1420 * @attrtype: attribute type of container
1422 * Returns the container attribute
1424 static inline struct nlattr
*nla_nest_start(struct sk_buff
*skb
, int attrtype
)
1426 struct nlattr
*start
= (struct nlattr
*)skb_tail_pointer(skb
);
1428 if (nla_put(skb
, attrtype
, 0, NULL
) < 0)
1435 * nla_nest_end - Finalize nesting of attributes
1436 * @skb: socket buffer the attributes are stored in
1437 * @start: container attribute
1439 * Corrects the container attribute header to include the all
1440 * appeneded attributes.
1442 * Returns the total data length of the skb.
1444 static inline int nla_nest_end(struct sk_buff
*skb
, struct nlattr
*start
)
1446 start
->nla_len
= skb_tail_pointer(skb
) - (unsigned char *)start
;
1451 * nla_nest_cancel - Cancel nesting of attributes
1452 * @skb: socket buffer the message is stored in
1453 * @start: container attribute
1455 * Removes the container attribute and including all nested
1456 * attributes. Returns -EMSGSIZE
1458 static inline void nla_nest_cancel(struct sk_buff
*skb
, struct nlattr
*start
)
1460 nlmsg_trim(skb
, start
);
1464 * nla_validate_nested - Validate a stream of nested attributes
1465 * @start: container attribute
1466 * @maxtype: maximum attribute type to be expected
1467 * @policy: validation policy
1468 * @extack: extended ACK report struct
1470 * Validates all attributes in the nested attribute stream against the
1471 * specified policy. Attributes with a type exceeding maxtype will be
1472 * ignored. See documenation of struct nla_policy for more details.
1474 * Returns 0 on success or a negative error code.
1476 static inline int nla_validate_nested(const struct nlattr
*start
, int maxtype
,
1477 const struct nla_policy
*policy
,
1478 struct netlink_ext_ack
*extack
)
1480 return nla_validate(nla_data(start
), nla_len(start
), maxtype
, policy
,
1485 * nla_need_padding_for_64bit - test 64-bit alignment of the next attribute
1486 * @skb: socket buffer the message is stored in
1488 * Return true if padding is needed to align the next attribute (nla_data()) to
1489 * a 64-bit aligned area.
1491 static inline bool nla_need_padding_for_64bit(struct sk_buff
*skb
)
1493 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1494 /* The nlattr header is 4 bytes in size, that's why we test
1495 * if the skb->data _is_ aligned. A NOP attribute, plus
1496 * nlattr header for next attribute, will make nla_data()
1499 if (IS_ALIGNED((unsigned long)skb_tail_pointer(skb
), 8))
1506 * nla_align_64bit - 64-bit align the nla_data() of next attribute
1507 * @skb: socket buffer the message is stored in
1508 * @padattr: attribute type for the padding
1510 * Conditionally emit a padding netlink attribute in order to make
1511 * the next attribute we emit have a 64-bit aligned nla_data() area.
1512 * This will only be done in architectures which do not have
1513 * CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS defined.
1515 * Returns zero on success or a negative error code.
1517 static inline int nla_align_64bit(struct sk_buff
*skb
, int padattr
)
1519 if (nla_need_padding_for_64bit(skb
) &&
1520 !nla_reserve(skb
, padattr
, 0))
1527 * nla_total_size_64bit - total length of attribute including padding
1528 * @payload: length of payload
1530 static inline int nla_total_size_64bit(int payload
)
1532 return NLA_ALIGN(nla_attr_size(payload
))
1533 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
1534 + NLA_ALIGN(nla_attr_size(0))
1540 * nla_for_each_attr - iterate over a stream of attributes
1541 * @pos: loop counter, set to current attribute
1542 * @head: head of attribute stream
1543 * @len: length of attribute stream
1544 * @rem: initialized to len, holds bytes currently remaining in stream
1546 #define nla_for_each_attr(pos, head, len, rem) \
1547 for (pos = head, rem = len; \
1549 pos = nla_next(pos, &(rem)))
1552 * nla_for_each_nested - iterate over nested attributes
1553 * @pos: loop counter, set to current attribute
1554 * @nla: attribute containing the nested attributes
1555 * @rem: initialized to len, holds bytes currently remaining in stream
1557 #define nla_for_each_nested(pos, nla, rem) \
1558 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
1561 * nla_is_last - Test if attribute is last in stream
1562 * @nla: attribute to test
1563 * @rem: bytes remaining in stream
1565 static inline bool nla_is_last(const struct nlattr
*nla
, int rem
)
1567 return nla
->nla_len
== rem
;