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 extern int netlink_rcv_skb(struct sk_buff
*skb
,
229 int (*cb
)(struct sk_buff
*,
231 extern int nlmsg_notify(struct sock
*sk
, struct sk_buff
*skb
,
232 u32 portid
, unsigned int group
, int report
,
235 extern int nla_validate(const struct nlattr
*head
,
236 int len
, int maxtype
,
237 const struct nla_policy
*policy
);
238 extern int nla_parse(struct nlattr
**tb
, int maxtype
,
239 const struct nlattr
*head
, int len
,
240 const struct nla_policy
*policy
);
241 extern int nla_policy_len(const struct nla_policy
*, int);
242 extern struct nlattr
* nla_find(const struct nlattr
*head
,
243 int len
, int attrtype
);
244 extern size_t nla_strlcpy(char *dst
, const struct nlattr
*nla
,
246 extern int nla_memcpy(void *dest
, const struct nlattr
*src
, int count
);
247 extern int nla_memcmp(const struct nlattr
*nla
, const void *data
,
249 extern int nla_strcmp(const struct nlattr
*nla
, const char *str
);
250 extern struct nlattr
* __nla_reserve(struct sk_buff
*skb
, int attrtype
,
252 extern void * __nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
253 extern struct nlattr
* nla_reserve(struct sk_buff
*skb
, int attrtype
,
255 extern void * nla_reserve_nohdr(struct sk_buff
*skb
, int attrlen
);
256 extern void __nla_put(struct sk_buff
*skb
, int attrtype
,
257 int attrlen
, const void *data
);
258 extern void __nla_put_nohdr(struct sk_buff
*skb
, int attrlen
,
260 extern int nla_put(struct sk_buff
*skb
, int attrtype
,
261 int attrlen
, const void *data
);
262 extern int nla_put_nohdr(struct sk_buff
*skb
, int attrlen
,
264 extern int nla_append(struct sk_buff
*skb
, int attrlen
,
267 /**************************************************************************
269 **************************************************************************/
272 * nlmsg_msg_size - length of netlink message not including padding
273 * @payload: length of message payload
275 static inline int nlmsg_msg_size(int payload
)
277 return NLMSG_HDRLEN
+ payload
;
281 * nlmsg_total_size - length of netlink message including padding
282 * @payload: length of message payload
284 static inline int nlmsg_total_size(int payload
)
286 return NLMSG_ALIGN(nlmsg_msg_size(payload
));
290 * nlmsg_padlen - length of padding at the message's tail
291 * @payload: length of message payload
293 static inline int nlmsg_padlen(int payload
)
295 return nlmsg_total_size(payload
) - nlmsg_msg_size(payload
);
299 * nlmsg_data - head of message payload
300 * @nlh: netlink message header
302 static inline void *nlmsg_data(const struct nlmsghdr
*nlh
)
304 return (unsigned char *) nlh
+ NLMSG_HDRLEN
;
308 * nlmsg_len - length of message payload
309 * @nlh: netlink message header
311 static inline int nlmsg_len(const struct nlmsghdr
*nlh
)
313 return nlh
->nlmsg_len
- NLMSG_HDRLEN
;
317 * nlmsg_attrdata - head of attributes data
318 * @nlh: netlink message header
319 * @hdrlen: length of family specific header
321 static inline struct nlattr
*nlmsg_attrdata(const struct nlmsghdr
*nlh
,
324 unsigned char *data
= nlmsg_data(nlh
);
325 return (struct nlattr
*) (data
+ NLMSG_ALIGN(hdrlen
));
329 * nlmsg_attrlen - length of attributes data
330 * @nlh: netlink message header
331 * @hdrlen: length of family specific header
333 static inline int nlmsg_attrlen(const struct nlmsghdr
*nlh
, int hdrlen
)
335 return nlmsg_len(nlh
) - NLMSG_ALIGN(hdrlen
);
339 * nlmsg_ok - check if the netlink message fits into the remaining bytes
340 * @nlh: netlink message header
341 * @remaining: number of bytes remaining in message stream
343 static inline int nlmsg_ok(const struct nlmsghdr
*nlh
, int remaining
)
345 return (remaining
>= (int) sizeof(struct nlmsghdr
) &&
346 nlh
->nlmsg_len
>= sizeof(struct nlmsghdr
) &&
347 nlh
->nlmsg_len
<= remaining
);
351 * nlmsg_next - next netlink message in message stream
352 * @nlh: netlink message header
353 * @remaining: number of bytes remaining in message stream
355 * Returns the next netlink message in the message stream and
356 * decrements remaining by the size of the current message.
358 static inline struct nlmsghdr
*
359 nlmsg_next(const struct nlmsghdr
*nlh
, int *remaining
)
361 int totlen
= NLMSG_ALIGN(nlh
->nlmsg_len
);
363 *remaining
-= totlen
;
365 return (struct nlmsghdr
*) ((unsigned char *) nlh
+ totlen
);
369 * nlmsg_parse - parse attributes of a netlink message
370 * @nlh: netlink message header
371 * @hdrlen: length of family specific header
372 * @tb: destination array with maxtype+1 elements
373 * @maxtype: maximum attribute type to be expected
374 * @policy: validation policy
378 static inline int nlmsg_parse(const struct nlmsghdr
*nlh
, int hdrlen
,
379 struct nlattr
*tb
[], int maxtype
,
380 const struct nla_policy
*policy
)
382 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
))
385 return nla_parse(tb
, maxtype
, nlmsg_attrdata(nlh
, hdrlen
),
386 nlmsg_attrlen(nlh
, hdrlen
), policy
);
390 * nlmsg_find_attr - find a specific attribute in a netlink message
391 * @nlh: netlink message header
392 * @hdrlen: length of familiy specific header
393 * @attrtype: type of attribute to look for
395 * Returns the first attribute which matches the specified type.
397 static inline struct nlattr
*nlmsg_find_attr(const struct nlmsghdr
*nlh
,
398 int hdrlen
, int attrtype
)
400 return nla_find(nlmsg_attrdata(nlh
, hdrlen
),
401 nlmsg_attrlen(nlh
, hdrlen
), attrtype
);
405 * nlmsg_validate - validate a netlink message including attributes
406 * @nlh: netlinket message header
407 * @hdrlen: length of familiy specific header
408 * @maxtype: maximum attribute type to be expected
409 * @policy: validation policy
411 static inline int nlmsg_validate(const struct nlmsghdr
*nlh
,
412 int hdrlen
, int maxtype
,
413 const struct nla_policy
*policy
)
415 if (nlh
->nlmsg_len
< nlmsg_msg_size(hdrlen
))
418 return nla_validate(nlmsg_attrdata(nlh
, hdrlen
),
419 nlmsg_attrlen(nlh
, hdrlen
), maxtype
, policy
);
423 * nlmsg_report - need to report back to application?
424 * @nlh: netlink message header
426 * Returns 1 if a report back to the application is requested.
428 static inline int nlmsg_report(const struct nlmsghdr
*nlh
)
430 return !!(nlh
->nlmsg_flags
& NLM_F_ECHO
);
434 * nlmsg_for_each_attr - iterate over a stream of attributes
435 * @pos: loop counter, set to current attribute
436 * @nlh: netlink message header
437 * @hdrlen: length of familiy specific header
438 * @rem: initialized to len, holds bytes currently remaining in stream
440 #define nlmsg_for_each_attr(pos, nlh, hdrlen, rem) \
441 nla_for_each_attr(pos, nlmsg_attrdata(nlh, hdrlen), \
442 nlmsg_attrlen(nlh, hdrlen), rem)
445 * nlmsg_put - Add a new netlink message to an skb
446 * @skb: socket buffer to store message in
447 * @portid: netlink process id
448 * @seq: sequence number of message
449 * @type: message type
450 * @payload: length of message payload
451 * @flags: message flags
453 * Returns NULL if the tailroom of the skb is insufficient to store
454 * the message header and payload.
456 static inline struct nlmsghdr
*nlmsg_put(struct sk_buff
*skb
, u32 portid
, u32 seq
,
457 int type
, int payload
, int flags
)
459 if (unlikely(skb_tailroom(skb
) < nlmsg_total_size(payload
)))
462 return __nlmsg_put(skb
, portid
, seq
, type
, payload
, flags
);
466 * nlmsg_put_answer - Add a new callback based netlink message to an skb
467 * @skb: socket buffer to store message in
468 * @cb: netlink callback
469 * @type: message type
470 * @payload: length of message payload
471 * @flags: message flags
473 * Returns NULL if the tailroom of the skb is insufficient to store
474 * the message header and payload.
476 static inline struct nlmsghdr
*nlmsg_put_answer(struct sk_buff
*skb
,
477 struct netlink_callback
*cb
,
478 int type
, int payload
,
481 return nlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
482 type
, payload
, flags
);
486 * nlmsg_new - Allocate a new netlink message
487 * @payload: size of the message payload
488 * @flags: the type of memory to allocate.
490 * Use NLMSG_DEFAULT_SIZE if the size of the payload isn't known
491 * and a good default is needed.
493 static inline struct sk_buff
*nlmsg_new(size_t payload
, gfp_t flags
)
495 return alloc_skb(nlmsg_total_size(payload
), flags
);
499 * nlmsg_end - Finalize a netlink message
500 * @skb: socket buffer the message is stored in
501 * @nlh: netlink message header
503 * Corrects the netlink message header to include the appeneded
504 * attributes. Only necessary if attributes have been added to
507 * Returns the total data length of the skb.
509 static inline int nlmsg_end(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
511 nlh
->nlmsg_len
= skb_tail_pointer(skb
) - (unsigned char *)nlh
;
517 * nlmsg_get_pos - return current position in netlink message
518 * @skb: socket buffer the message is stored in
520 * Returns a pointer to the current tail of the message.
522 static inline void *nlmsg_get_pos(struct sk_buff
*skb
)
524 return skb_tail_pointer(skb
);
528 * nlmsg_trim - Trim message to a mark
529 * @skb: socket buffer the message is stored in
530 * @mark: mark to trim to
532 * Trims the message to the provided mark.
534 static inline void nlmsg_trim(struct sk_buff
*skb
, const void *mark
)
537 skb_trim(skb
, (unsigned char *) mark
- skb
->data
);
541 * nlmsg_cancel - Cancel construction of a netlink message
542 * @skb: socket buffer the message is stored in
543 * @nlh: netlink message header
545 * Removes the complete netlink message including all
546 * attributes from the socket buffer again.
548 static inline void nlmsg_cancel(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
550 nlmsg_trim(skb
, nlh
);
554 * nlmsg_free - free a netlink message
555 * @skb: socket buffer of netlink message
557 static inline void nlmsg_free(struct sk_buff
*skb
)
563 * nlmsg_multicast - multicast a netlink message
564 * @sk: netlink socket to spread messages to
565 * @skb: netlink message as socket buffer
566 * @portid: own netlink portid to avoid sending to yourself
567 * @group: multicast group id
568 * @flags: allocation flags
570 static inline int nlmsg_multicast(struct sock
*sk
, struct sk_buff
*skb
,
571 u32 portid
, unsigned int group
, gfp_t flags
)
575 NETLINK_CB(skb
).dst_group
= group
;
577 err
= netlink_broadcast(sk
, skb
, portid
, group
, flags
);
585 * nlmsg_unicast - unicast a netlink message
586 * @sk: netlink socket to spread message to
587 * @skb: netlink message as socket buffer
588 * @portid: netlink portid of the destination socket
590 static inline int nlmsg_unicast(struct sock
*sk
, struct sk_buff
*skb
, u32 portid
)
594 err
= netlink_unicast(sk
, skb
, portid
, MSG_DONTWAIT
);
602 * nlmsg_for_each_msg - iterate over a stream of messages
603 * @pos: loop counter, set to current message
604 * @head: head of message stream
605 * @len: length of message stream
606 * @rem: initialized to len, holds bytes currently remaining in stream
608 #define nlmsg_for_each_msg(pos, head, len, rem) \
609 for (pos = head, rem = len; \
610 nlmsg_ok(pos, rem); \
611 pos = nlmsg_next(pos, &(rem)))
614 * nl_dump_check_consistent - check if sequence is consistent and advertise if not
615 * @cb: netlink callback structure that stores the sequence number
616 * @nlh: netlink message header to write the flag to
618 * This function checks if the sequence (generation) number changed during dump
619 * and if it did, advertises it in the netlink message header.
621 * The correct way to use it is to set cb->seq to the generation counter when
622 * all locks for dumping have been acquired, and then call this function for
623 * each message that is generated.
625 * Note that due to initialisation concerns, 0 is an invalid sequence number
626 * and must not be used by code that uses this functionality.
629 nl_dump_check_consistent(struct netlink_callback
*cb
,
630 struct nlmsghdr
*nlh
)
632 if (cb
->prev_seq
&& cb
->seq
!= cb
->prev_seq
)
633 nlh
->nlmsg_flags
|= NLM_F_DUMP_INTR
;
634 cb
->prev_seq
= cb
->seq
;
637 /**************************************************************************
639 **************************************************************************/
642 * nla_attr_size - length of attribute not including padding
643 * @payload: length of payload
645 static inline int nla_attr_size(int payload
)
647 return NLA_HDRLEN
+ payload
;
651 * nla_total_size - total length of attribute including padding
652 * @payload: length of payload
654 static inline int nla_total_size(int payload
)
656 return NLA_ALIGN(nla_attr_size(payload
));
660 * nla_padlen - length of padding at the tail of attribute
661 * @payload: length of payload
663 static inline int nla_padlen(int payload
)
665 return nla_total_size(payload
) - nla_attr_size(payload
);
669 * nla_type - attribute type
670 * @nla: netlink attribute
672 static inline int nla_type(const struct nlattr
*nla
)
674 return nla
->nla_type
& NLA_TYPE_MASK
;
678 * nla_data - head of payload
679 * @nla: netlink attribute
681 static inline void *nla_data(const struct nlattr
*nla
)
683 return (char *) nla
+ NLA_HDRLEN
;
687 * nla_len - length of payload
688 * @nla: netlink attribute
690 static inline int nla_len(const struct nlattr
*nla
)
692 return nla
->nla_len
- NLA_HDRLEN
;
696 * nla_ok - check if the netlink attribute fits into the remaining bytes
697 * @nla: netlink attribute
698 * @remaining: number of bytes remaining in attribute stream
700 static inline int nla_ok(const struct nlattr
*nla
, int remaining
)
702 return remaining
>= (int) sizeof(*nla
) &&
703 nla
->nla_len
>= sizeof(*nla
) &&
704 nla
->nla_len
<= remaining
;
708 * nla_next - next netlink attribute in attribute stream
709 * @nla: netlink attribute
710 * @remaining: number of bytes remaining in attribute stream
712 * Returns the next netlink attribute in the attribute stream and
713 * decrements remaining by the size of the current attribute.
715 static inline struct nlattr
*nla_next(const struct nlattr
*nla
, int *remaining
)
717 int totlen
= NLA_ALIGN(nla
->nla_len
);
719 *remaining
-= totlen
;
720 return (struct nlattr
*) ((char *) nla
+ totlen
);
724 * nla_find_nested - find attribute in a set of nested attributes
725 * @nla: attribute containing the nested attributes
726 * @attrtype: type of attribute to look for
728 * Returns the first attribute which matches the specified type.
730 static inline struct nlattr
*
731 nla_find_nested(const struct nlattr
*nla
, int attrtype
)
733 return nla_find(nla_data(nla
), nla_len(nla
), attrtype
);
737 * nla_parse_nested - parse nested attributes
738 * @tb: destination array with maxtype+1 elements
739 * @maxtype: maximum attribute type to be expected
740 * @nla: attribute containing the nested attributes
741 * @policy: validation policy
745 static inline int nla_parse_nested(struct nlattr
*tb
[], int maxtype
,
746 const struct nlattr
*nla
,
747 const struct nla_policy
*policy
)
749 return nla_parse(tb
, maxtype
, nla_data(nla
), nla_len(nla
), policy
);
753 * nla_put_u8 - Add a u8 netlink attribute to a socket buffer
754 * @skb: socket buffer to add attribute to
755 * @attrtype: attribute type
756 * @value: numeric value
758 static inline int nla_put_u8(struct sk_buff
*skb
, int attrtype
, u8 value
)
760 return nla_put(skb
, attrtype
, sizeof(u8
), &value
);
764 * nla_put_u16 - Add a u16 netlink attribute to a socket buffer
765 * @skb: socket buffer to add attribute to
766 * @attrtype: attribute type
767 * @value: numeric value
769 static inline int nla_put_u16(struct sk_buff
*skb
, int attrtype
, u16 value
)
771 return nla_put(skb
, attrtype
, sizeof(u16
), &value
);
775 * nla_put_be16 - Add a __be16 netlink attribute to a socket buffer
776 * @skb: socket buffer to add attribute to
777 * @attrtype: attribute type
778 * @value: numeric value
780 static inline int nla_put_be16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
782 return nla_put(skb
, attrtype
, sizeof(__be16
), &value
);
786 * nla_put_net16 - Add 16-bit network byte order netlink attribute to a socket buffer
787 * @skb: socket buffer to add attribute to
788 * @attrtype: attribute type
789 * @value: numeric value
791 static inline int nla_put_net16(struct sk_buff
*skb
, int attrtype
, __be16 value
)
793 return nla_put_be16(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
797 * nla_put_le16 - Add a __le16 netlink attribute to a socket buffer
798 * @skb: socket buffer to add attribute to
799 * @attrtype: attribute type
800 * @value: numeric value
802 static inline int nla_put_le16(struct sk_buff
*skb
, int attrtype
, __le16 value
)
804 return nla_put(skb
, attrtype
, sizeof(__le16
), &value
);
808 * nla_put_u32 - Add a u32 netlink attribute to a socket buffer
809 * @skb: socket buffer to add attribute to
810 * @attrtype: attribute type
811 * @value: numeric value
813 static inline int nla_put_u32(struct sk_buff
*skb
, int attrtype
, u32 value
)
815 return nla_put(skb
, attrtype
, sizeof(u32
), &value
);
819 * nla_put_be32 - Add a __be32 netlink attribute to a socket buffer
820 * @skb: socket buffer to add attribute to
821 * @attrtype: attribute type
822 * @value: numeric value
824 static inline int nla_put_be32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
826 return nla_put(skb
, attrtype
, sizeof(__be32
), &value
);
830 * nla_put_net32 - Add 32-bit network byte order netlink attribute to a socket buffer
831 * @skb: socket buffer to add attribute to
832 * @attrtype: attribute type
833 * @value: numeric value
835 static inline int nla_put_net32(struct sk_buff
*skb
, int attrtype
, __be32 value
)
837 return nla_put_be32(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
841 * nla_put_le32 - Add a __le32 netlink attribute to a socket buffer
842 * @skb: socket buffer to add attribute to
843 * @attrtype: attribute type
844 * @value: numeric value
846 static inline int nla_put_le32(struct sk_buff
*skb
, int attrtype
, __le32 value
)
848 return nla_put(skb
, attrtype
, sizeof(__le32
), &value
);
852 * nla_put_u64 - Add a u64 netlink attribute to a socket buffer
853 * @skb: socket buffer to add attribute to
854 * @attrtype: attribute type
855 * @value: numeric value
857 static inline int nla_put_u64(struct sk_buff
*skb
, int attrtype
, u64 value
)
859 return nla_put(skb
, attrtype
, sizeof(u64
), &value
);
863 * nla_put_be64 - Add a __be64 netlink attribute to a socket buffer
864 * @skb: socket buffer to add attribute to
865 * @attrtype: attribute type
866 * @value: numeric value
868 static inline int nla_put_be64(struct sk_buff
*skb
, int attrtype
, __be64 value
)
870 return nla_put(skb
, attrtype
, sizeof(__be64
), &value
);
874 * nla_put_net64 - Add 64-bit network byte order netlink attribute to a socket buffer
875 * @skb: socket buffer to add attribute to
876 * @attrtype: attribute type
877 * @value: numeric value
879 static inline int nla_put_net64(struct sk_buff
*skb
, int attrtype
, __be64 value
)
881 return nla_put_be64(skb
, attrtype
| NLA_F_NET_BYTEORDER
, value
);
885 * nla_put_le64 - Add a __le64 netlink attribute to a socket buffer
886 * @skb: socket buffer to add attribute to
887 * @attrtype: attribute type
888 * @value: numeric value
890 static inline int nla_put_le64(struct sk_buff
*skb
, int attrtype
, __le64 value
)
892 return nla_put(skb
, attrtype
, sizeof(__le64
), &value
);
896 * nla_put_s8 - Add a s8 netlink attribute to a socket buffer
897 * @skb: socket buffer to add attribute to
898 * @attrtype: attribute type
899 * @value: numeric value
901 static inline int nla_put_s8(struct sk_buff
*skb
, int attrtype
, s8 value
)
903 return nla_put(skb
, attrtype
, sizeof(s8
), &value
);
907 * nla_put_s16 - Add a s16 netlink attribute to a socket buffer
908 * @skb: socket buffer to add attribute to
909 * @attrtype: attribute type
910 * @value: numeric value
912 static inline int nla_put_s16(struct sk_buff
*skb
, int attrtype
, s16 value
)
914 return nla_put(skb
, attrtype
, sizeof(s16
), &value
);
918 * nla_put_s32 - Add a s32 netlink attribute to a socket buffer
919 * @skb: socket buffer to add attribute to
920 * @attrtype: attribute type
921 * @value: numeric value
923 static inline int nla_put_s32(struct sk_buff
*skb
, int attrtype
, s32 value
)
925 return nla_put(skb
, attrtype
, sizeof(s32
), &value
);
929 * nla_put_s64 - Add a s64 netlink attribute to a socket buffer
930 * @skb: socket buffer to add attribute to
931 * @attrtype: attribute type
932 * @value: numeric value
934 static inline int nla_put_s64(struct sk_buff
*skb
, int attrtype
, s64 value
)
936 return nla_put(skb
, attrtype
, sizeof(s64
), &value
);
940 * nla_put_string - Add a string netlink attribute to a socket buffer
941 * @skb: socket buffer to add attribute to
942 * @attrtype: attribute type
943 * @str: NUL terminated string
945 static inline int nla_put_string(struct sk_buff
*skb
, int attrtype
,
948 return nla_put(skb
, attrtype
, strlen(str
) + 1, str
);
952 * nla_put_flag - Add a flag netlink attribute to a socket buffer
953 * @skb: socket buffer to add attribute to
954 * @attrtype: attribute type
956 static inline int nla_put_flag(struct sk_buff
*skb
, int attrtype
)
958 return nla_put(skb
, attrtype
, 0, NULL
);
962 * nla_put_msecs - Add a msecs netlink attribute to a socket buffer
963 * @skb: socket buffer to add attribute to
964 * @attrtype: attribute type
965 * @jiffies: number of msecs in jiffies
967 static inline int nla_put_msecs(struct sk_buff
*skb
, int attrtype
,
968 unsigned long jiffies
)
970 u64 tmp
= jiffies_to_msecs(jiffies
);
971 return nla_put(skb
, attrtype
, sizeof(u64
), &tmp
);
975 * nla_get_u32 - return payload of u32 attribute
976 * @nla: u32 netlink attribute
978 static inline u32
nla_get_u32(const struct nlattr
*nla
)
980 return *(u32
*) nla_data(nla
);
984 * nla_get_be32 - return payload of __be32 attribute
985 * @nla: __be32 netlink attribute
987 static inline __be32
nla_get_be32(const struct nlattr
*nla
)
989 return *(__be32
*) nla_data(nla
);
993 * nla_get_u16 - return payload of u16 attribute
994 * @nla: u16 netlink attribute
996 static inline u16
nla_get_u16(const struct nlattr
*nla
)
998 return *(u16
*) nla_data(nla
);
1002 * nla_get_be16 - return payload of __be16 attribute
1003 * @nla: __be16 netlink attribute
1005 static inline __be16
nla_get_be16(const struct nlattr
*nla
)
1007 return *(__be16
*) nla_data(nla
);
1011 * nla_get_le16 - return payload of __le16 attribute
1012 * @nla: __le16 netlink attribute
1014 static inline __le16
nla_get_le16(const struct nlattr
*nla
)
1016 return *(__le16
*) nla_data(nla
);
1020 * nla_get_u8 - return payload of u8 attribute
1021 * @nla: u8 netlink attribute
1023 static inline u8
nla_get_u8(const struct nlattr
*nla
)
1025 return *(u8
*) nla_data(nla
);
1029 * nla_get_u64 - return payload of u64 attribute
1030 * @nla: u64 netlink attribute
1032 static inline u64
nla_get_u64(const struct nlattr
*nla
)
1036 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1042 * nla_get_be64 - return payload of __be64 attribute
1043 * @nla: __be64 netlink attribute
1045 static inline __be64
nla_get_be64(const struct nlattr
*nla
)
1049 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1055 * nla_get_s32 - return payload of s32 attribute
1056 * @nla: s32 netlink attribute
1058 static inline s32
nla_get_s32(const struct nlattr
*nla
)
1060 return *(s32
*) nla_data(nla
);
1064 * nla_get_s16 - return payload of s16 attribute
1065 * @nla: s16 netlink attribute
1067 static inline s16
nla_get_s16(const struct nlattr
*nla
)
1069 return *(s16
*) nla_data(nla
);
1073 * nla_get_s8 - return payload of s8 attribute
1074 * @nla: s8 netlink attribute
1076 static inline s8
nla_get_s8(const struct nlattr
*nla
)
1078 return *(s8
*) nla_data(nla
);
1082 * nla_get_s64 - return payload of s64 attribute
1083 * @nla: s64 netlink attribute
1085 static inline s64
nla_get_s64(const struct nlattr
*nla
)
1089 nla_memcpy(&tmp
, nla
, sizeof(tmp
));
1095 * nla_get_flag - return payload of flag attribute
1096 * @nla: flag netlink attribute
1098 static inline int nla_get_flag(const struct nlattr
*nla
)
1104 * nla_get_msecs - return payload of msecs attribute
1105 * @nla: msecs netlink attribute
1107 * Returns the number of milliseconds in jiffies.
1109 static inline unsigned long nla_get_msecs(const struct nlattr
*nla
)
1111 u64 msecs
= nla_get_u64(nla
);
1113 return msecs_to_jiffies((unsigned long) msecs
);
1117 * nla_nest_start - Start a new level of nested attributes
1118 * @skb: socket buffer to add attributes to
1119 * @attrtype: attribute type of container
1121 * Returns the container attribute
1123 static inline struct nlattr
*nla_nest_start(struct sk_buff
*skb
, int attrtype
)
1125 struct nlattr
*start
= (struct nlattr
*)skb_tail_pointer(skb
);
1127 if (nla_put(skb
, attrtype
, 0, NULL
) < 0)
1134 * nla_nest_end - Finalize nesting of attributes
1135 * @skb: socket buffer the attributes are stored in
1136 * @start: container attribute
1138 * Corrects the container attribute header to include the all
1139 * appeneded attributes.
1141 * Returns the total data length of the skb.
1143 static inline int nla_nest_end(struct sk_buff
*skb
, struct nlattr
*start
)
1145 start
->nla_len
= skb_tail_pointer(skb
) - (unsigned char *)start
;
1150 * nla_nest_cancel - Cancel nesting of attributes
1151 * @skb: socket buffer the message is stored in
1152 * @start: container attribute
1154 * Removes the container attribute and including all nested
1155 * attributes. Returns -EMSGSIZE
1157 static inline void nla_nest_cancel(struct sk_buff
*skb
, struct nlattr
*start
)
1159 nlmsg_trim(skb
, start
);
1163 * nla_validate_nested - Validate a stream of nested attributes
1164 * @start: container attribute
1165 * @maxtype: maximum attribute type to be expected
1166 * @policy: validation policy
1168 * Validates all attributes in the nested attribute stream against the
1169 * specified policy. Attributes with a type exceeding maxtype will be
1170 * ignored. See documenation of struct nla_policy for more details.
1172 * Returns 0 on success or a negative error code.
1174 static inline int nla_validate_nested(const struct nlattr
*start
, int maxtype
,
1175 const struct nla_policy
*policy
)
1177 return nla_validate(nla_data(start
), nla_len(start
), maxtype
, policy
);
1181 * nla_for_each_attr - iterate over a stream of attributes
1182 * @pos: loop counter, set to current attribute
1183 * @head: head of attribute stream
1184 * @len: length of attribute stream
1185 * @rem: initialized to len, holds bytes currently remaining in stream
1187 #define nla_for_each_attr(pos, head, len, rem) \
1188 for (pos = head, rem = len; \
1190 pos = nla_next(pos, &(rem)))
1193 * nla_for_each_nested - iterate over nested attributes
1194 * @pos: loop counter, set to current attribute
1195 * @nla: attribute containing the nested attributes
1196 * @rem: initialized to len, holds bytes currently remaining in stream
1198 #define nla_for_each_nested(pos, nla, rem) \
1199 nla_for_each_attr(pos, nla_data(nla), nla_len(nla), rem)
This page took 0.055177 seconds and 5 git commands to generate.