1 #ifndef __NET_NETLINK_H
2 #define __NET_NETLINK_H
4 #include <linux/types.h>
5 #include <linux/netlink.h>
6 #include <linux/jiffies.h>
8 /* ========================================================================
9 * Netlink Messages and Attributes Interface (As Seen On TV)
10 * ------------------------------------------------------------------------
12 * ------------------------------------------------------------------------
15 * <--- nlmsg_total_size(payload) --->
16 * <-- nlmsg_msg_size(payload) ->
17 * +----------+- - -+-------------+- - -+-------- - -
18 * | nlmsghdr | Pad | Payload | Pad | nlmsghdr
19 * +----------+- - -+-------------+- - -+-------- - -
20 * nlmsg_data(nlh)---^ ^
21 * nlmsg_next(nlh)-----------------------+
24 * <---------------------- nlmsg_len(nlh) --------------------->
25 * <------ hdrlen ------> <- nlmsg_attrlen(nlh, hdrlen) ->
26 * +----------------------+- - -+--------------------------------+
27 * | Family Header | Pad | Attributes |
28 * +----------------------+- - -+--------------------------------+
29 * nlmsg_attrdata(nlh, hdrlen)---^
32 * struct nlmsghdr netlink message header
34 * Message Construction:
35 * nlmsg_new() create a new netlink message
36 * nlmsg_put() add a netlink message to an skb
37 * nlmsg_put_answer() callback based nlmsg_put()
38 * nlmsg_end() finalize netlink message
39 * nlmsg_get_pos() return current position in message
40 * nlmsg_trim() trim part of message
41 * nlmsg_cancel() cancel message construction
42 * nlmsg_free() free a netlink message
45 * nlmsg_multicast() multicast message to several groups
46 * nlmsg_unicast() unicast a message to a single socket
47 * nlmsg_notify() send notification message
49 * Message Length Calculations:
50 * nlmsg_msg_size(payload) length of message w/o padding
51 * nlmsg_total_size(payload) length of message w/ padding
52 * nlmsg_padlen(payload) length of padding at tail
54 * Message Payload Access:
55 * nlmsg_data(nlh) head of message payload
56 * nlmsg_len(nlh) length of message payload
57 * nlmsg_attrdata(nlh, hdrlen) head of attributes data
58 * nlmsg_attrlen(nlh, hdrlen) length of attributes data
61 * nlmsg_ok(nlh, remaining) does nlh fit into remaining bytes?
62 * nlmsg_next(nlh, remaining) get next netlink message
63 * nlmsg_parse() parse attributes of a message
64 * nlmsg_find_attr() find an attribute in a message
65 * nlmsg_for_each_msg() loop over all messages
66 * nlmsg_validate() validate netlink message incl. attrs
67 * nlmsg_for_each_attr() loop over all attributes
70 * nlmsg_report() report back to application?
72 * ------------------------------------------------------------------------
73 * Attributes Interface
74 * ------------------------------------------------------------------------
77 * <------- nla_total_size(payload) ------->
78 * <---- nla_attr_size(payload) ----->
79 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
80 * | Header | Pad | Payload | Pad | Header
81 * +----------+- - -+- - - - - - - - - +- - -+-------- - -
82 * <- nla_len(nla) -> ^
83 * nla_data(nla)----^ |
84 * nla_next(nla)-----------------------------'
87 * struct nlattr netlink attribute header
89 * Attribute Construction:
90 * nla_reserve(skb, type, len) reserve room for an attribute
91 * nla_reserve_nohdr(skb, len) reserve room for an attribute w/o hdr
92 * nla_put(skb, type, len, data) add attribute to skb
93 * nla_put_nohdr(skb, len, data) add attribute w/o hdr
94 * nla_append(skb, len, data) append data to skb
96 * Attribute Construction for Basic Types:
97 * nla_put_u8(skb, type, value) add u8 attribute to skb
98 * nla_put_u16(skb, type, value) add u16 attribute to skb
99 * nla_put_u32(skb, type, value) add u32 attribute to skb
100 * nla_put_u64(skb, type, value) add u64 attribute to skb
101 * nla_put_s8(skb, type, value) add s8 attribute to skb
102 * nla_put_s16(skb, type, value) add s16 attribute to skb
103 * nla_put_s32(skb, type, value) add s32 attribute to skb
104 * nla_put_s64(skb, type, value) add s64 attribute to skb
105 * nla_put_string(skb, type, str) add string attribute to skb
106 * nla_put_flag(skb, type) add flag attribute to skb
107 * nla_put_msecs(skb, type, jiffies) add msecs attribute to skb
109 * Nested Attributes Construction:
110 * nla_nest_start(skb, type) start a nested attribute
111 * nla_nest_end(skb, nla) finalize a nested attribute
112 * nla_nest_cancel(skb, nla) cancel nested attribute construction
114 * Attribute Length Calculations:
115 * nla_attr_size(payload) length of attribute w/o padding
116 * nla_total_size(payload) length of attribute w/ padding
117 * nla_padlen(payload) length of padding
119 * Attribute Payload Access:
120 * nla_data(nla) head of attribute payload
121 * nla_len(nla) length of attribute payload
123 * Attribute Payload Access for Basic Types:
124 * nla_get_u8(nla) get payload for a u8 attribute
125 * nla_get_u16(nla) get payload for a u16 attribute
126 * nla_get_u32(nla) get payload for a u32 attribute
127 * nla_get_u64(nla) get payload for a u64 attribute
128 * nla_get_s8(nla) get payload for a s8 attribute
129 * nla_get_s16(nla) get payload for a s16 attribute
130 * nla_get_s32(nla) get payload for a s32 attribute
131 * nla_get_s64(nla) get payload for a s64 attribute
132 * nla_get_flag(nla) return 1 if flag is true
133 * nla_get_msecs(nla) get payload for a msecs attribute
136 * nla_memcpy(dest, nla, count) copy attribute into memory
137 * nla_memcmp(nla, data, size) compare attribute with memory area
138 * nla_strlcpy(dst, nla, size) copy attribute to a sized string
139 * nla_strcmp(nla, str) compare attribute with string
142 * nla_ok(nla, remaining) does nla fit into remaining bytes?
143 * nla_next(nla, remaining) get next netlink attribute
144 * nla_validate() validate a stream of attributes
145 * nla_validate_nested() validate a stream of nested attributes
146 * nla_find() find attribute in stream of attributes
147 * nla_find_nested() find attribute in nested attributes
148 * nla_parse() parse and validate stream of attrs
149 * nla_parse_nested() parse nested attribuets
150 * nla_for_each_attr() loop over all attributes
151 * nla_for_each_nested() loop over the nested attributes
152 *=========================================================================
156 * Standard attribute types to specify validation policy
178 #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
181 * struct nla_policy - attribute validation policy
182 * @type: Type of attribute or NLA_UNSPEC
183 * @len: Type specific length of payload
185 * Policies are defined as arrays of this struct, the array must be
186 * accessible by attribute type up to the highest identifier to be expected.
188 * Meaning of `len' field:
189 * NLA_STRING Maximum length of string
190 * NLA_NUL_STRING Maximum length of string (excluding NUL)
192 * NLA_BINARY Maximum length of attribute payload
193 * NLA_NESTED Don't use `len' field -- length verification is
194 * done by checking len of nested header (or empty)
195 * NLA_NESTED_COMPAT Minimum length of structure payload
200 * NLA_MSECS Leaving the length field zero will verify the
201 * given type fits, using it verifies minimum length
202 * just like "All other"
203 * All other Minimum length of attribute payload
206 * static const struct nla_policy my_policy[ATTR_MAX+1] = {
207 * [ATTR_FOO] = { .type = NLA_U16 },
208 * [ATTR_BAR] = { .type = NLA_STRING, .len = BARSIZ },
209 * [ATTR_BAZ] = { .len = sizeof(struct mystruct) },
218 * struct nl_info - netlink source information
219 * @nlh: Netlink message header of original request
220 * @portid: Netlink PORTID of requesting application
223 struct nlmsghdr
*nlh
;
228 int netlink_rcv_skb(struct sk_buff
*skb
,
229 int (*cb
)(struct sk_buff
*, struct nlmsghdr
*));
230 int nlmsg_notify(struct sock
*sk
, struct sk_buff
*skb
, u32 portid
,
231 unsigned int group
, int report
, gfp_t flags
);
233 int nla_validate(const struct nlattr
*head
, int len
, int maxtype
,
234 const struct nla_policy
*policy
);
235 int nla_parse(struct nlattr
**tb
, int maxtype
, const struct nlattr
*head
,
236 int len
, const struct nla_policy
*policy
);
237 int nla_policy_len(const struct nla_policy
*, int);
238 struct nlattr
*nla_find(const struct nlattr
*head
, int len
, int attrtype
);
239 size_t nla_strlcpy(char *dst
, const struct nlattr
*nla
, size_t dstsize
);
240 int nla_memcpy(void *dest
, const struct nlattr
*src
, int count
);
241 int nla_memcmp(const struct nlattr
*nla
, const void *data
, size_t size
);
242 int nla_strcmp(const struct nlattr
*nla
, const char *str
);
243 struct nlattr
*__nla_reserve(struct sk_buff
*skb
, int attrtype
, int attrlen
);
244 void *__nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
245 struct nlattr
*nla_reserve(struct sk_buff
*skb
, int attrtype
, int attrlen
);
246 void *nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
247 void __nla_put(struct sk_buff
*skb
, int attrtype
, int attrlen
,
249 void __nla_put_nohdr(struct sk_buff
*skb
, int attrlen
, const void *data
);
250 int nla_put(struct sk_buff
*skb
, int attrtype
, int attrlen
, const void *data
);
251 int nla_put_nohdr(struct sk_buff
*skb
, int attrlen
, const void *data
);
252 int nla_append(struct sk_buff
*skb
, int attrlen
, const void *data
);
254 /**************************************************************************
256 **************************************************************************/
259 * nlmsg_msg_size - length of netlink message not including padding
260 * @payload: length of message payload
262 static inline int nlmsg_msg_size(int payload
)
264 return NLMSG_HDRLEN
+ payload
;
268 * nlmsg_total_size - length of netlink message including padding
269 * @payload: length of message payload
271 static inline int nlmsg_total_size(int payload
)
273 return NLMSG_ALIGN(nlmsg_msg_size(payload
));
277 * nlmsg_padlen - length of padding at the message's tail
278 * @payload: length of message payload
280 static inline int nlmsg_padlen(int payload
)
282 return nlmsg_total_size(payload
) - nlmsg_msg_size(payload
);
286 * nlmsg_data - head of message payload
287 * @nlh: netlink message header
289 static inline void *nlmsg_data(const struct nlmsghdr
*nlh
)
291 return (unsigned char *) nlh
+ NLMSG_HDRLEN
;
295 * nlmsg_len - length of message payload
296 * @nlh: netlink message header
298 static inline int nlmsg_len(const struct nlmsghdr
*nlh
)
300 return nlh
->nlmsg_len
- NLMSG_HDRLEN
;
304 * nlmsg_attrdata - head of attributes data
305 * @nlh: netlink message header
306 * @hdrlen: length of family specific header
308 static inline struct nlattr
*nlmsg_attrdata(const struct nlmsghdr
*nlh
,
311 unsigned char *data
= nlmsg_data(nlh
);
312 return (struct nlattr
*) (data
+ NLMSG_ALIGN(hdrlen
));
316 * nlmsg_attrlen - length of attributes data
317 * @nlh: netlink message header
318 * @hdrlen: length of family specific header
320 static inline int nlmsg_attrlen(const struct nlmsghdr
*nlh
, int hdrlen
)
322 return nlmsg_len(nlh
) - NLMSG_ALIGN(hdrlen
);
326 * nlmsg_ok - check if the netlink message fits into the remaining bytes
327 * @nlh: netlink message header
328 * @remaining: number of bytes remaining in message stream
330 static inline int nlmsg_ok(const struct nlmsghdr
*nlh
, int remaining
)
332 return (remaining
>= (int) sizeof(struct nlmsghdr
) &&
333 nlh
->nlmsg_len
>= sizeof(struct nlmsghdr
) &&
334 nlh
->nlmsg_len
<= remaining
);
338 * nlmsg_next - next netlink message in message stream
339 * @nlh: netlink message header
340 * @remaining: number of bytes remaining in message stream
342 * Returns the next netlink message in the message stream and
343 * decrements remaining by the size of the current message.
345 static inline struct nlmsghdr
*
346 nlmsg_next(const struct nlmsghdr
*nlh
, int *remaining
)
348 int totlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
350 *remaining
-= totlen
;
352 return (struct nlmsghdr
*) ((unsigned char *) nlh
+ totlen
);
356 * nlmsg_parse - parse attributes of a netlink message
357 * @nlh: netlink message header
358 * @hdrlen: length of family specific header
359 * @tb: destination array with maxtype+1 elements
360 * @maxtype: maximum attribute type to be expected
361 * @policy: validation policy
365 static inline int nlmsg_parse(const struct nlmsghdr
*nlh
, int hdrlen
,
366 struct nlattr
*tb
[], int maxtype
,
367 const struct nla_policy
*policy
)
369 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
))
372 return nla_parse(tb
, maxtype
, nlmsg_attrdata(nlh
, hdrlen
),
373 nlmsg_attrlen(nlh
, hdrlen
), policy
);
377 * nlmsg_find_attr - find a specific attribute in a netlink message
378 * @nlh: netlink message header
379 * @hdrlen: length of familiy specific header
380 * @attrtype: type of attribute to look for
382 * Returns the first attribute which matches the specified type.
384 static inline struct nlattr
*nlmsg_find_attr(const struct nlmsghdr
*nlh
,
385 int hdrlen
, int attrtype
)
387 return nla_find(nlmsg_attrdata(nlh
, hdrlen
),
388 nlmsg_attrlen(nlh
, hdrlen
), attrtype
);
392 * nlmsg_validate - validate a netlink message including attributes
393 * @nlh: netlinket message header
394 * @hdrlen: length of familiy specific header
395 * @maxtype: maximum attribute type to be expected
396 * @policy: validation policy
398 static inline int nlmsg_validate(const struct nlmsghdr
*nlh
,
399 int hdrlen
, int maxtype
,
400 const struct nla_policy
*policy
)
402 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
))
405 return nla_validate(nlmsg_attrdata(nlh
, hdrlen
),
406 nlmsg_attrlen(nlh
, hdrlen
), maxtype
, policy
);
410 * nlmsg_report - need to report back to application?
411 * @nlh: netlink message header
413 * Returns 1 if a report back to the application is requested.
415 static inline int nlmsg_report(const struct nlmsghdr
*nlh
)
417 return !!(nlh
->nlmsg_flags
& NLM_F_ECHO
);
421 * nlmsg_for_each_attr - iterate over a stream of attributes
422 * @pos: loop counter, set to current attribute
423 * @nlh: netlink message header
424 * @hdrlen: length of familiy specific header
425 * @rem: initialized to len, holds bytes currently remaining in stream
427 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
428 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
429 nlmsg_attrlen(nlh, hdrlen), rem)
432 * nlmsg_put - Add a new netlink message to an skb
433 * @skb: socket buffer to store message in
434 * @portid: netlink process id
435 * @seq: sequence number of message
436 * @type: message type
437 * @payload: length of message payload
438 * @flags: message flags
440 * Returns NULL if the tailroom of the skb is insufficient to store
441 * the message header and payload.
443 static inline struct nlmsghdr
*nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
,
444 int type
, int payload
, int flags
)
446 if (unlikely(skb_tailroom(skb
) < nlmsg_total_size(payload
)))
449 return __nlmsg_put(skb
, portid
, seq
, type
, payload
, flags
);
453 * nlmsg_put_answer - Add a new callback based netlink message to an skb
454 * @skb: socket buffer to store message in
455 * @cb: netlink callback
456 * @type: message type
457 * @payload: length of message payload
458 * @flags: message flags
460 * Returns NULL if the tailroom of the skb is insufficient to store
461 * the message header and payload.
463 static inline struct nlmsghdr
*nlmsg_put_answer(struct sk_buff
*skb
,
464 struct netlink_callback
*cb
,
465 int type
, int payload
,
468 return nlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
469 type
, payload
, flags
);
473 * nlmsg_new - Allocate a new netlink message
474 * @payload: size of the message payload
475 * @flags: the type of memory to allocate.
477 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
478 * and a good default is needed.
480 static inline struct sk_buff
*nlmsg_new(size_t payload
, gfp_t flags
)
482 return alloc_skb(nlmsg_total_size(payload
), flags
);
486 * nlmsg_end - Finalize a netlink message
487 * @skb: socket buffer the message is stored in
488 * @nlh: netlink message header
490 * Corrects the netlink message header to include the appeneded
491 * attributes. Only necessary if attributes have been added to
494 * Returns the total data length of the skb.
496 static inline int nlmsg_end(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
498 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - (unsigned char *)nlh
;
504 * nlmsg_get_pos - return current position in netlink message
505 * @skb: socket buffer the message is stored in
507 * Returns a pointer to the current tail of the message.
509 static inline void *nlmsg_get_pos(struct sk_buff
*skb
)
511 return skb_tail_pointer(skb
);
515 * nlmsg_trim - Trim message to a mark
516 * @skb: socket buffer the message is stored in
517 * @mark: mark to trim to
519 * Trims the message to the provided mark.
521 static inline void nlmsg_trim(struct sk_buff
*skb
, const void *mark
)
524 skb_trim(skb
, (unsigned char *) mark
- skb
->data
);
528 * nlmsg_cancel - Cancel construction of a netlink message
529 * @skb: socket buffer the message is stored in
530 * @nlh: netlink message header
532 * Removes the complete netlink message including all
533 * attributes from the socket buffer again.
535 static inline void nlmsg_cancel(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
537 nlmsg_trim(skb
, nlh
);
541 * nlmsg_free - free a netlink message
542 * @skb: socket buffer of netlink message
544 static inline void nlmsg_free(struct sk_buff
*skb
)
550 * nlmsg_multicast - multicast a netlink message
551 * @sk: netlink socket to spread messages to
552 * @skb: netlink message as socket buffer
553 * @portid: own netlink portid to avoid sending to yourself
554 * @group: multicast group id
555 * @flags: allocation flags
557 static inline int nlmsg_multicast(struct sock
*sk
, struct sk_buff
*skb
,
558 u32 portid
, unsigned int group
, gfp_t flags
)
562 NETLINK_CB(skb
).dst_group
= group
;
564 err
= netlink_broadcast(sk
, skb
, portid
, group
, flags
);
572 * nlmsg_unicast - unicast a netlink message
573 * @sk: netlink socket to spread message to
574 * @skb: netlink message as socket buffer
575 * @portid: netlink portid of the destination socket
577 static inline int nlmsg_unicast(struct sock
*sk
, struct sk_buff
*skb
, u32 portid
)
581 err
= netlink_unicast(sk
, skb
, portid
, MSG_DONTWAIT
);
589 * nlmsg_for_each_msg - iterate over a stream of messages
590 * @pos: loop counter, set to current message
591 * @head: head of message stream
592 * @len: length of message stream
593 * @rem: initialized to len, holds bytes currently remaining in stream
595 #define nlmsg_for_each_msg(pos, head, len, rem) \
596 for (pos = head, rem = len; \
597 nlmsg_ok(pos, rem); \
598 pos = nlmsg_next(pos, &(rem)))
601 * nl_dump_check_consistent - check if sequence is consistent and advertise if not
602 * @cb: netlink callback structure that stores the sequence number
603 * @nlh: netlink message header to write the flag to
605 * This function checks if the sequence (generation) number changed during dump
606 * and if it did, advertises it in the netlink message header.
608 * The correct way to use it is to set cb->seq to the generation counter when
609 * all locks for dumping have been acquired, and then call this function for
610 * each message that is generated.
612 * Note that due to initialisation concerns, 0 is an invalid sequence number
613 * and must not be used by code that uses this functionality.
616 nl_dump_check_consistent(struct netlink_callback
*cb
,
617 struct nlmsghdr
*nlh
)
619 if (cb
->prev_seq
&& cb
->seq
!= cb
->prev_seq
)
620 nlh
->nlmsg_flags
|= NLM_F_DUMP_INTR
;
621 cb
->prev_seq
= cb
->seq
;
624 /**************************************************************************
626 **************************************************************************/
629 * nla_attr_size - length of attribute not including padding
630 * @payload: length of payload
632 static inline int nla_attr_size(int payload
)
634 return NLA_HDRLEN
+ payload
;
638 * nla_total_size - total length of attribute including padding
639 * @payload: length of payload
641 static inline int nla_total_size(int payload
)
643 return NLA_ALIGN(nla_attr_size(payload
));
647 * nla_padlen - length of padding at the tail of attribute
648 * @payload: length of payload
650 static inline int nla_padlen(int payload
)
652 return nla_total_size(payload
) - nla_attr_size(payload
);
656 * nla_type - attribute type
657 * @nla: netlink attribute
659 static inline int nla_type(const struct nlattr
*nla
)
661 return nla
->nla_type
& NLA_TYPE_MASK
;
665 * nla_data - head of payload
666 * @nla: netlink attribute
668 static inline void *nla_data(const struct nlattr
*nla
)
670 return (char *) nla
+ NLA_HDRLEN
;
674 * nla_len - length of payload
675 * @nla: netlink attribute
677 static inline int nla_len(const struct nlattr
*nla
)
679 return nla
->nla_len
- NLA_HDRLEN
;
683 * nla_ok - check if the netlink attribute fits into the remaining bytes
684 * @nla: netlink attribute
685 * @remaining: number of bytes remaining in attribute stream
687 static inline int nla_ok(const struct nlattr
*nla
, int remaining
)
689 return remaining
>= (int) sizeof(*nla
) &&
690 nla
->nla_len
>= sizeof(*nla
) &&
691 nla
->nla_len
<= remaining
;
695 * nla_next - next netlink attribute in attribute stream
696 * @nla: netlink attribute
697 * @remaining: number of bytes remaining in attribute stream
699 * Returns the next netlink attribute in the attribute stream and
700 * decrements remaining by the size of the current attribute.
702 static inline struct nlattr
*nla_next(const struct nlattr
*nla
, int *remaining
)
704 int totlen
= NLA_ALIGN(nla
->nla_len
);
706 *remaining
-= totlen
;
707 return (struct nlattr
*) ((char *) nla
+ totlen
);
711 * nla_find_nested - find attribute in a set of nested attributes
712 * @nla: attribute containing the nested attributes
713 * @attrtype: type of attribute to look for
715 * Returns the first attribute which matches the specified type.
717 static inline struct nlattr
*
718 nla_find_nested(const struct nlattr
*nla
, int attrtype
)
720 return nla_find(nla_data(nla
), nla_len(nla
), attrtype
);
724 * nla_parse_nested - parse nested attributes
725 * @tb: destination array with maxtype+1 elements
726 * @maxtype: maximum attribute type to be expected
727 * @nla: attribute containing the nested attributes
728 * @policy: validation policy
732 static inline int nla_parse_nested(struct nlattr
*tb
[], int maxtype
,
733 const struct nlattr
*nla
,
734 const struct nla_policy
*policy
)
736 return nla_parse(tb
, maxtype
, nla_data(nla
), nla_len(nla
), policy
);
740 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
741 * @skb: socket buffer to add attribute to
742 * @attrtype: attribute type
743 * @value: numeric value
745 static inline int nla_put_u8(struct sk_buff
*skb
, int attrtype
, u8 value
)
747 return nla_put(skb
, attrtype
, sizeof(u8
), &value
);
751 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
752 * @skb: socket buffer to add attribute to
753 * @attrtype: attribute type
754 * @value: numeric value
756 static inline int nla_put_u16(struct sk_buff
*skb
, int attrtype
, u16 value
)
758 return nla_put(skb
, attrtype
, sizeof(u16
), &value
);
762 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
763 * @skb: socket buffer to add attribute to
764 * @attrtype: attribute type
765 * @value: numeric value
767 static inline int nla_put_be16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
769 return nla_put(skb
, attrtype
, sizeof(__be16
), &value
);
773 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
774 * @skb: socket buffer to add attribute to
775 * @attrtype: attribute type
776 * @value: numeric value
778 static inline int nla_put_net16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
780 return nla_put_be16(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
784 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
785 * @skb: socket buffer to add attribute to
786 * @attrtype: attribute type
787 * @value: numeric value
789 static inline int nla_put_le16(struct sk_buff
*skb
, int attrtype
, __le16 value
)
791 return nla_put(skb
, attrtype
, sizeof(__le16
), &value
);
795 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
796 * @skb: socket buffer to add attribute to
797 * @attrtype: attribute type
798 * @value: numeric value
800 static inline int nla_put_u32(struct sk_buff
*skb
, int attrtype
, u32 value
)
802 return nla_put(skb
, attrtype
, sizeof(u32
), &value
);
806 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
807 * @skb: socket buffer to add attribute to
808 * @attrtype: attribute type
809 * @value: numeric value
811 static inline int nla_put_be32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
813 return nla_put(skb
, attrtype
, sizeof(__be32
), &value
);
817 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
818 * @skb: socket buffer to add attribute to
819 * @attrtype: attribute type
820 * @value: numeric value
822 static inline int nla_put_net32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
824 return nla_put_be32(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
828 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
829 * @skb: socket buffer to add attribute to
830 * @attrtype: attribute type
831 * @value: numeric value
833 static inline int nla_put_le32(struct sk_buff
*skb
, int attrtype
, __le32 value
)
835 return nla_put(skb
, attrtype
, sizeof(__le32
), &value
);
839 * nla_put_u64 - Add a u64 netlink attribute to a socket buffer
840 * @skb: socket buffer to add attribute to
841 * @attrtype: attribute type
842 * @value: numeric value
844 static inline int nla_put_u64(struct sk_buff
*skb
, int attrtype
, u64 value
)
846 return nla_put(skb
, attrtype
, sizeof(u64
), &value
);
850 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer
851 * @skb: socket buffer to add attribute to
852 * @attrtype: attribute type
853 * @value: numeric value
855 static inline int nla_put_be64(struct sk_buff
*skb
, int attrtype
, __be64 value
)
857 return nla_put(skb
, attrtype
, sizeof(__be64
), &value
);
861 * nla_put_net64 - Add 64-bit network byte order netlink attribute to a socket buffer
862 * @skb: socket buffer to add attribute to
863 * @attrtype: attribute type
864 * @value: numeric value
866 static inline int nla_put_net64(struct sk_buff
*skb
, int attrtype
, __be64 value
)
868 return nla_put_be64(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
872 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer
873 * @skb: socket buffer to add attribute to
874 * @attrtype: attribute type
875 * @value: numeric value
877 static inline int nla_put_le64(struct sk_buff
*skb
, int attrtype
, __le64 value
)
879 return nla_put(skb
, attrtype
, sizeof(__le64
), &value
);
883 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
884 * @skb: socket buffer to add attribute to
885 * @attrtype: attribute type
886 * @value: numeric value
888 static inline int nla_put_s8(struct sk_buff
*skb
, int attrtype
, s8 value
)
890 return nla_put(skb
, attrtype
, sizeof(s8
), &value
);
894 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
895 * @skb: socket buffer to add attribute to
896 * @attrtype: attribute type
897 * @value: numeric value
899 static inline int nla_put_s16(struct sk_buff
*skb
, int attrtype
, s16 value
)
901 return nla_put(skb
, attrtype
, sizeof(s16
), &value
);
905 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
906 * @skb: socket buffer to add attribute to
907 * @attrtype: attribute type
908 * @value: numeric value
910 static inline int nla_put_s32(struct sk_buff
*skb
, int attrtype
, s32 value
)
912 return nla_put(skb
, attrtype
, sizeof(s32
), &value
);
916 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer
917 * @skb: socket buffer to add attribute to
918 * @attrtype: attribute type
919 * @value: numeric value
921 static inline int nla_put_s64(struct sk_buff
*skb
, int attrtype
, s64 value
)
923 return nla_put(skb
, attrtype
, sizeof(s64
), &value
);
927 * nla_put_string - Add a string netlink attribute to a socket buffer
928 * @skb: socket buffer to add attribute to
929 * @attrtype: attribute type
930 * @str: NUL terminated string
932 static inline int nla_put_string(struct sk_buff
*skb
, int attrtype
,
935 return nla_put(skb
, attrtype
, strlen(str
) + 1, str
);
939 * nla_put_flag - Add a flag netlink attribute to a socket buffer
940 * @skb: socket buffer to add attribute to
941 * @attrtype: attribute type
943 static inline int nla_put_flag(struct sk_buff
*skb
, int attrtype
)
945 return nla_put(skb
, attrtype
, 0, NULL
);
949 * nla_put_msecs - Add a msecs netlink attribute to a socket buffer
950 * @skb: socket buffer to add attribute to
951 * @attrtype: attribute type
952 * @jiffies: number of msecs in jiffies
954 static inline int nla_put_msecs(struct sk_buff
*skb
, int attrtype
,
955 unsigned long jiffies
)
957 u64 tmp
= jiffies_to_msecs(jiffies
);
958 return nla_put(skb
, attrtype
, sizeof(u64
), &tmp
);
962 * nla_get_u32 - return payload of u32 attribute
963 * @nla: u32 netlink attribute
965 static inline u32
nla_get_u32(const struct nlattr
*nla
)
967 return *(u32
*) nla_data(nla
);
971 * nla_get_be32 - return payload of __be32 attribute
972 * @nla: __be32 netlink attribute
974 static inline __be32
nla_get_be32(const struct nlattr
*nla
)
976 return *(__be32
*) nla_data(nla
);
980 * nla_get_u16 - return payload of u16 attribute
981 * @nla: u16 netlink attribute
983 static inline u16
nla_get_u16(const struct nlattr
*nla
)
985 return *(u16
*) nla_data(nla
);
989 * nla_get_be16 - return payload of __be16 attribute
990 * @nla: __be16 netlink attribute
992 static inline __be16
nla_get_be16(const struct nlattr
*nla
)
994 return *(__be16
*) nla_data(nla
);
998 * nla_get_le16 - return payload of __le16 attribute
999 * @nla: __le16 netlink attribute
1001 static inline __le16
nla_get_le16(const struct nlattr
*nla
)
1003 return *(__le16
*) nla_data(nla
);
1007 * nla_get_u8 - return payload of u8 attribute
1008 * @nla: u8 netlink attribute
1010 static inline u8
nla_get_u8(const struct nlattr
*nla
)
1012 return *(u8
*) nla_data(nla
);
1016 * nla_get_u64 - return payload of u64 attribute
1017 * @nla: u64 netlink attribute
1019 static inline u64
nla_get_u64(const struct nlattr
*nla
)
1023 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1029 * nla_get_be64 - return payload of __be64 attribute
1030 * @nla: __be64 netlink attribute
1032 static inline __be64
nla_get_be64(const struct nlattr
*nla
)
1036 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1042 * nla_get_s32 - return payload of s32 attribute
1043 * @nla: s32 netlink attribute
1045 static inline s32
nla_get_s32(const struct nlattr
*nla
)
1047 return *(s32
*) nla_data(nla
);
1051 * nla_get_s16 - return payload of s16 attribute
1052 * @nla: s16 netlink attribute
1054 static inline s16
nla_get_s16(const struct nlattr
*nla
)
1056 return *(s16
*) nla_data(nla
);
1060 * nla_get_s8 - return payload of s8 attribute
1061 * @nla: s8 netlink attribute
1063 static inline s8
nla_get_s8(const struct nlattr
*nla
)
1065 return *(s8
*) nla_data(nla
);
1069 * nla_get_s64 - return payload of s64 attribute
1070 * @nla: s64 netlink attribute
1072 static inline s64
nla_get_s64(const struct nlattr
*nla
)
1076 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1082 * nla_get_flag - return payload of flag attribute
1083 * @nla: flag netlink attribute
1085 static inline int nla_get_flag(const struct nlattr
*nla
)
1091 * nla_get_msecs - return payload of msecs attribute
1092 * @nla: msecs netlink attribute
1094 * Returns the number of milliseconds in jiffies.
1096 static inline unsigned long nla_get_msecs(const struct nlattr
*nla
)
1098 u64 msecs
= nla_get_u64(nla
);
1100 return msecs_to_jiffies((unsigned long) msecs
);
1104 * nla_nest_start - Start a new level of nested attributes
1105 * @skb: socket buffer to add attributes to
1106 * @attrtype: attribute type of container
1108 * Returns the container attribute
1110 static inline struct nlattr
*nla_nest_start(struct sk_buff
*skb
, int attrtype
)
1112 struct nlattr
*start
= (struct nlattr
*)skb_tail_pointer(skb
);
1114 if (nla_put(skb
, attrtype
, 0, NULL
) < 0)
1121 * nla_nest_end - Finalize nesting of attributes
1122 * @skb: socket buffer the attributes are stored in
1123 * @start: container attribute
1125 * Corrects the container attribute header to include the all
1126 * appeneded attributes.
1128 * Returns the total data length of the skb.
1130 static inline int nla_nest_end(struct sk_buff
*skb
, struct nlattr
*start
)
1132 start
->nla_len
= skb_tail_pointer(skb
) - (unsigned char *)start
;
1137 * nla_nest_cancel - Cancel nesting of attributes
1138 * @skb: socket buffer the message is stored in
1139 * @start: container attribute
1141 * Removes the container attribute and including all nested
1142 * attributes. Returns -EMSGSIZE
1144 static inline void nla_nest_cancel(struct sk_buff
*skb
, struct nlattr
*start
)
1146 nlmsg_trim(skb
, start
);
1150 * nla_validate_nested - Validate a stream of nested attributes
1151 * @start: container attribute
1152 * @maxtype: maximum attribute type to be expected
1153 * @policy: validation policy
1155 * Validates all attributes in the nested attribute stream against the
1156 * specified policy. Attributes with a type exceeding maxtype will be
1157 * ignored. See documenation of struct nla_policy for more details.
1159 * Returns 0 on success or a negative error code.
1161 static inline int nla_validate_nested(const struct nlattr
*start
, int maxtype
,
1162 const struct nla_policy
*policy
)
1164 return nla_validate(nla_data(start
), nla_len(start
), maxtype
, policy
);
1168 * nla_for_each_attr - iterate over a stream of attributes
1169 * @pos: loop counter, set to current attribute
1170 * @head: head of attribute stream
1171 * @len: length of attribute stream
1172 * @rem: initialized to len, holds bytes currently remaining in stream
1174 #define nla_for_each_attr(pos, head, len, rem) \
1175 for (pos = head, rem = len; \
1177 pos = nla_next(pos, &(rem)))
1180 * nla_for_each_nested - iterate over nested attributes
1181 * @pos: loop counter, set to current attribute
1182 * @nla: attribute containing the nested attributes
1183 * @rem: initialized to len, holds bytes currently remaining in stream
1185 #define nla_for_each_nested(pos, nla, rem) \
1186 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
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