libnl: /data/src/libnl/lib/cache.c Source File

libnl 3.12.0

cache.c
1/* SPDX-License-Identifier: LGPL-2.1-only */
2/*
3 * Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch>
4 */
5
6/**
7 * @ingroup cache_mngt
8 * @defgroup cache Cache
9 *
10 * @code
11 * Cache Management | | Type Specific Cache Operations
12 *
13 * | | +----------------+ +------------+
14 * | request update | | msg_parser |
15 * | | +----------------+ +------------+
16 * +- - - - -^- - - - - - - -^- -|- - - -
17 * nl_cache_update: | | | |
18 * 1) --------- co_request_update ------+ | |
19 * | | |
20 * 2) destroy old cache +----------- pp_cb ---------|---+
21 * | | |
22 * 3) ---------- nl_recvmsgs ----------+ +- cb_valid -+
23 * +--------------+ | | | |
24 * | nl_cache_add |<-----+ + - - -v- -|- - - - - - - - - - -
25 * +--------------+ | | +-------------+
26 * | nl_recvmsgs |
27 * | | +-----|-^-----+
28 * +---v-|---+
29 * | | | nl_recv |
30 * +---------+
31 * | | Core Netlink
32 * @endcode
33 *
34 * Related sections in the development guide:
35 * - @core_doc{core_cache, Caching System}
36 *
37 * @{
38 *
39 * Header
40 * ------
41 * ~~~~{.c}
42 * #include <netlink/cache.h>
43 * ~~~~
44 */
45
46#include "nl-default.h"
47
48#include <netlink/netlink.h>
49#include <netlink/cache.h>
50#include <netlink/object.h>
51#include <netlink/hashtable.h>
52#include <netlink/utils.h>
53
54#include "nl-core.h"
55#include "nl-priv-dynamic-core/nl-core.h"
56#include "nl-priv-dynamic-core/object-api.h"
57#include "nl-priv-dynamic-core/cache-api.h"
58#include "hashtable-api.h"
59#include "nl-aux-core/nl-core.h"
60
61/**
62 * @name Access Functions
63 * @{
64 */
65
66/**
67 * Return the number of items in the cache
68 * @arg cache cache handle
69 */
70 int nl_cache_nitems(struct nl_cache *cache)
71{
72 return cache->c_nitems;
73}
74
75/**
76 * Return the number of items matching a filter in the cache
77 * @arg cache Cache object.
78 * @arg filter Filter object.
79 */
80 int nl_cache_nitems_filter(struct nl_cache *cache, struct nl_object *filter)
81{
82 struct nl_object *obj;
83 int nitems = 0;
84
85 if (cache->c_ops == NULL)
86 BUG();
87
88 nl_list_for_each_entry(obj, &cache->c_items, ce_list) {
89 if (filter && !nl_object_match_filter(obj, filter))
90 continue;
91
92 nitems++;
93 }
94
95 return nitems;
96}
97
98/**
99 * Returns \b true if the cache is empty.
100 * @arg cache Cache to check
101 * @return \a true if the cache is empty, otherwise \b false is returned.
102 */
103 int nl_cache_is_empty(struct nl_cache *cache)
104{
105 return nl_list_empty(&cache->c_items);
106}
107
108/**
109 * Return the operations set of the cache
110 * @arg cache cache handle
111 */
112 struct nl_cache_ops *nl_cache_get_ops(struct nl_cache *cache)
113{
114 return cache->c_ops;
115}
116
117/**
118 * Return the first element in the cache
119 * @arg cache cache handle
120 */
121 struct nl_object *nl_cache_get_first(struct nl_cache *cache)
122{
123 if (nl_list_empty(&cache->c_items))
124 return NULL;
125
126 return nl_list_entry(cache->c_items.next,
127 struct nl_object, ce_list);
128}
129
130/**
131 * Return the last element in the cache
132 * @arg cache cache handle
133 */
134 struct nl_object *nl_cache_get_last(struct nl_cache *cache)
135{
136 if (nl_list_empty(&cache->c_items))
137 return NULL;
138
139 return nl_list_entry(cache->c_items.prev,
140 struct nl_object, ce_list);
141}
142
143/**
144 * Return the next element in the cache
145 * @arg obj current object
146 */
147 struct nl_object *nl_cache_get_next(struct nl_object *obj)
148{
149 if (nl_list_at_tail(obj, &obj->ce_cache->c_items, ce_list))
150 return NULL;
151 else
152 return nl_list_entry(obj->ce_list.next,
153 struct nl_object, ce_list);
154}
155
156/**
157 * Return the previous element in the cache
158 * @arg obj current object
159 */
160 struct nl_object *nl_cache_get_prev(struct nl_object *obj)
161{
162 if (nl_list_at_head(obj, &obj->ce_cache->c_items, ce_list))
163 return NULL;
164 else
165 return nl_list_entry(obj->ce_list.prev,
166 struct nl_object, ce_list);
167}
168
169/** @} */
170
171/**
172 * @name Cache Allocation/Deletion
173 * @{
174 */
175
176/**
177 * Allocate new cache
178 * @arg ops Cache operations
179 *
180 * Allocate and initialize a new cache based on the cache operations
181 * provided.
182 *
183 * @return Allocated cache or NULL if allocation failed.
184 */
185 struct nl_cache *nl_cache_alloc(struct nl_cache_ops *ops)
186{
187 struct nl_cache *cache;
188
189 cache = calloc(1, sizeof(*cache));
190 if (!cache)
191 return NULL;
192
193 nl_init_list_head(&cache->c_items);
194 cache->c_ops = ops;
195 cache->c_flags |= ops->co_flags;
196 cache->c_refcnt = 1;
197
198 /*
199 * If object type provides a hash keygen
200 * functions, allocate a hash table for the
201 * cache objects for faster lookups
202 */
203 if (ops->co_obj_ops->oo_keygen) {
204 cache->hashtable = nl_rhash_table_alloc();
205 }
206
207 NL_DBG(2, "Allocated cache %p <%s>.\n", cache, nl_cache_name(cache));
208
209 return cache;
210}
211
212/**
213 * Allocate new cache and fill it
214 * @arg ops Cache operations
215 * @arg sock Netlink socket
216 * @arg result Result pointer
217 *
218 * Allocate new cache and fill it. Equivalent to calling:
219 * @code
220 * cache = nl_cache_alloc(ops);
221 * nl_cache_refill(sock, cache);
222 * @endcode
223 *
224 * @see nl_cache_alloc
225 *
226 * @return 0 on success or a negative error code.
227 */
228 int nl_cache_alloc_and_fill(struct nl_cache_ops *ops, struct nl_sock *sock,
229 struct nl_cache **result)
230{
231 struct nl_cache *cache;
232 int err;
233
234 if (!(cache = nl_cache_alloc(ops)))
235 return -NLE_NOMEM;
236
237 if (sock && (err = nl_cache_refill(sock, cache)) < 0) {
238 nl_cache_free(cache);
239 return err;
240 }
241
242 *result = cache;
243 return 0;
244}
245
246/**
247 * Allocate new cache based on type name
248 * @arg kind Name of cache type
249 * @arg result Result pointer
250 *
251 * Lookup cache ops via nl_cache_ops_lookup() and allocate the cache
252 * by calling nl_cache_alloc(). Stores the allocated cache in the
253 * result pointer provided.
254 *
255 * @see nl_cache_alloc
256 *
257 * @return 0 on success or a negative error code.
258 */
259 int nl_cache_alloc_name(const char *kind, struct nl_cache **result)
260{
261 struct nl_cache_ops *ops;
262 struct nl_cache *cache;
263
264 ops = nl_cache_ops_lookup_safe(kind);
265 if (!ops)
266 return -NLE_NOCACHE;
267
268 cache = nl_cache_alloc(ops);
269 nl_cache_ops_put(ops);
270 if (!cache)
271 return -NLE_NOMEM;
272
273 *result = cache;
274 return 0;
275}
276
277/**
278 * Allocate new cache containing a subset of an existing cache
279 * @arg orig Original cache to base new cache on
280 * @arg filter Filter defining the subset to be filled into the new cache
281 *
282 * Allocates a new cache matching the type of the cache specified by
283 * \p orig. Iterates over the \p orig cache applying the specified
284 * \p filter and copies all objects that match to the new cache.
285 *
286 * The copied objects are clones but do not contain a reference to each
287 * other. Later modifications to objects in the original cache will
288 * not affect objects in the new cache.
289 *
290 * @return A newly allocated cache or NULL.
291 */
292 struct nl_cache *nl_cache_subset(struct nl_cache *orig,
293 struct nl_object *filter)
294{
295 struct nl_cache *cache;
296 struct nl_object *obj;
297
298 if (!filter)
299 BUG();
300
301 cache = nl_cache_alloc(orig->c_ops);
302 if (!cache)
303 return NULL;
304
305 NL_DBG(2, "Filling subset of cache %p <%s> with filter %p into %p\n",
306 orig, nl_cache_name(orig), filter, cache);
307
308 nl_list_for_each_entry(obj, &orig->c_items, ce_list) {
309 if (!nl_object_match_filter(obj, filter))
310 continue;
311
312 nl_cache_add(cache, obj);
313 }
314
315 return cache;
316}
317
318/**
319 * Allocate new cache and copy the contents of an existing cache
320 * @arg cache Original cache to base new cache on
321 *
322 * Allocates a new cache matching the type of the cache specified by
323 * \p cache. Iterates over the \p cache cache and copies all objects
324 * to the new cache.
325 *
326 * The copied objects are clones but do not contain a reference to each
327 * other. Later modifications to objects in the original cache will
328 * not affect objects in the new cache.
329 *
330 * @return A newly allocated cache or NULL.
331 */
332 struct nl_cache *nl_cache_clone(struct nl_cache *cache)
333{
334 struct nl_cache_ops *ops = nl_cache_get_ops(cache);
335 struct nl_cache *clone;
336 struct nl_object *obj;
337
338 clone = nl_cache_alloc(ops);
339 if (!clone)
340 return NULL;
341
342 NL_DBG(2, "Cloning %p into %p\n", cache, clone);
343
344 nl_list_for_each_entry(obj, &cache->c_items, ce_list)
345 nl_cache_add(clone, obj);
346
347 return clone;
348}
349
350/**
351 * Remove all objects of a cache.
352 * @arg cache Cache to clear
353 *
354 * The objects are unliked/removed from the cache by calling
355 * nl_cache_remove() on each object in the cache. If any of the objects
356 * to not contain any further references to them, those objects will
357 * be freed.
358 *
359 * Unlike with nl_cache_free(), the cache is not freed just emptied.
360 */
361 void nl_cache_clear(struct nl_cache *cache)
362{
363 struct nl_object *obj, *tmp;
364
365 NL_DBG(2, "Clearing cache %p <%s>...\n", cache, nl_cache_name(cache));
366
367 nl_list_for_each_entry_safe(obj, tmp, &cache->c_items, ce_list)
368 nl_cache_remove(obj);
369}
370
371static void __nl_cache_free(struct nl_cache *cache)
372{
373 nl_cache_clear(cache);
374
375 if (cache->hashtable)
376 nl_rhash_table_free(cache->hashtable);
377
378 NL_DBG(2, "Freeing cache %p <%s>...\n", cache, nl_cache_name(cache));
379 free(cache);
380}
381
382/**
383 * Increase reference counter of cache
384 * @arg cache Cache
385 */
386 void nl_cache_get(struct nl_cache *cache)
387{
388 cache->c_refcnt++;
389
390 NL_DBG(3, "Incremented cache %p <%s> reference count to %d\n",
391 cache, nl_cache_name(cache), cache->c_refcnt);
392}
393
394/**
395 * Free a cache.
396 * @arg cache Cache to free.
397 *
398 * Calls nl_cache_clear() to remove all objects associated with the
399 * cache and frees the cache afterwards.
400 *
401 * @see nl_cache_clear()
402 */
403 void nl_cache_free(struct nl_cache *cache)
404{
405 if (!cache)
406 return;
407
408 cache->c_refcnt--;
409
410 NL_DBG(3, "Decremented cache %p <%s> reference count, %d remaining\n",
411 cache, nl_cache_name(cache), cache->c_refcnt);
412
413 if (cache->c_refcnt <= 0)
414 __nl_cache_free(cache);
415}
416
417void nl_cache_put(struct nl_cache *cache)
418{
419 nl_cache_free(cache);
420}
421
422/** @} */
423
424/**
425 * @name Cache Modifications
426 * @{
427 */
428
429static int __cache_add(struct nl_cache *cache, struct nl_object *obj)
430{
431 int ret;
432
433 obj->ce_cache = cache;
434
435 if (cache->hashtable) {
436 ret = nl_rhash_table_add(cache->hashtable, obj);
437 if (ret < 0) {
438 obj->ce_cache = NULL;
439 return ret;
440 }
441 }
442
443 nl_list_add_tail(&obj->ce_list, &cache->c_items);
444 cache->c_nitems++;
445
446 NL_DBG(3, "Added object %p to cache %p <%s>, nitems %d\n",
447 obj, cache, nl_cache_name(cache), cache->c_nitems);
448
449 return 0;
450}
451
452/**
453 * Add object to cache.
454 * @arg cache Cache
455 * @arg obj Object to be added to the cache
456 *
457 * Adds the object \p obj to the specified \p cache. In case the object
458 * is already associated with another cache, the object is cloned before
459 * adding it to the cache. In this case, the sole reference to the object
460 * will be the one of the cache. Therefore clearing/freeing the cache
461 * will result in the object being freed again.
462 *
463 * If the object has not been associated with a cache yet, the reference
464 * counter of the object is incremented to account for the additional
465 * reference.
466 *
467 * The type of the object and cache must match, otherwise an error is
468 * returned (-NLE_OBJ_MISMATCH).
469 *
470 * @see nl_cache_move()
471 *
472 * @return 0 or a negative error code.
473 */
474 int nl_cache_add(struct nl_cache *cache, struct nl_object *obj)
475{
476 struct nl_object *new;
477 int ret = 0;
478
479 if (cache->c_ops->co_obj_ops != obj->ce_ops)
480 return -NLE_OBJ_MISMATCH;
481
482 if (!nl_list_empty(&obj->ce_list)) {
483 NL_DBG(3, "Object %p already in cache, cloning new object\n", obj);
484
485 new = nl_object_clone(obj);
486 if (!new)
487 return -NLE_NOMEM;
488 } else {
489 nl_object_get(obj);
490 new = obj;
491 }
492
493 ret = __cache_add(cache, new);
494 if (ret < 0)
495 nl_object_put(new);
496
497 return ret;
498}
499
500/**
501 * Move object from one cache to another
502 * @arg cache Cache to move object to.
503 * @arg obj Object subject to be moved
504 *
505 * Removes the the specified object \p obj from its associated cache
506 * and moves it to another cache.
507 *
508 * If the object is not associated with a cache, the function behaves
509 * just like nl_cache_add().
510 *
511 * The type of the object and cache must match, otherwise an error is
512 * returned (-NLE_OBJ_MISMATCH).
513 *
514 * @see nl_cache_add()
515 *
516 * @return 0 on success or a negative error code.
517 */
518 int nl_cache_move(struct nl_cache *cache, struct nl_object *obj)
519{
520 if (cache->c_ops->co_obj_ops != obj->ce_ops)
521 return -NLE_OBJ_MISMATCH;
522
523 NL_DBG(3, "Moving object %p from cache %p to cache %p\n",
524 obj, obj->ce_cache, cache);
525
526 /* Acquire reference, if already in a cache this will be
527 * reverted during removal */
528 nl_object_get(obj);
529
530 if (!nl_list_empty(&obj->ce_list))
531 nl_cache_remove(obj);
532
533 return __cache_add(cache, obj);
534}
535
536/**
537 * Remove object from cache.
538 * @arg obj Object to remove from cache
539 *
540 * Removes the object \c obj from the cache it is associated with. The
541 * reference counter of the object will be decremented. If the reference
542 * to the object was the only one remaining, the object will be freed.
543 *
544 * If no cache is associated with the object, this function is a NOP.
545 */
546 void nl_cache_remove(struct nl_object *obj)
547{
548 int ret;
549 struct nl_cache *cache = obj->ce_cache;
550
551 if (cache == NULL)
552 return;
553
554 if (cache->hashtable) {
555 ret = nl_rhash_table_del(cache->hashtable, obj);
556 if (ret < 0)
557 NL_DBG(2, "Failed to delete %p from cache %p <%s>.\n",
558 obj, cache, nl_cache_name(cache));
559 }
560
561 nl_list_del(&obj->ce_list);
562 obj->ce_cache = NULL;
563 nl_object_put(obj);
564 cache->c_nitems--;
565
566 NL_DBG(2, "Deleted object %p from cache %p <%s>.\n",
567 obj, cache, nl_cache_name(cache));
568}
569
570/** @} */
571
572/**
573 * @name Synchronization
574 * @{
575 */
576
577/**
578 * Set synchronization arg1 of cache
579 * @arg cache Cache
580 * @arg arg argument
581 *
582 * Synchronization arguments are used to specify filters when
583 * requesting dumps from the kernel.
584 */
585 void nl_cache_set_arg1(struct nl_cache *cache, int arg)
586{
587 cache->c_iarg1 = arg;
588}
589
590/**
591 * Set synchronization arg2 of cache
592 * @arg cache Cache
593 * @arg arg argument
594 *
595 * Synchronization arguments are used to specify filters when
596 * requesting dumps from the kernel.
597 */
598 void nl_cache_set_arg2(struct nl_cache *cache, int arg)
599{
600 cache->c_iarg2 = arg;
601}
602
603/**
604 * Set cache flags
605 * @arg cache Cache
606 * @arg flags Flags
607 */
608 void nl_cache_set_flags(struct nl_cache *cache, unsigned int flags)
609{
610 cache->c_flags |= flags;
611}
612
613/**
614 * Invoke the request-update operation
615 * @arg sk Netlink socket.
616 * @arg cache Cache
617 *
618 * This function causes the \e request-update function of the cache
619 * operations to be invoked. This usually causes a dump request to
620 * be sent over the netlink socket which triggers the kernel to dump
621 * all objects of a specific type to be dumped onto the netlink
622 * socket for pickup.
623 *
624 * The behaviour of this function depends on the implemenation of
625 * the \e request_update function of each individual type of cache.
626 *
627 * This function will not have any effects on the cache (unless the
628 * request_update implementation of the cache operations does so).
629 *
630 * Use nl_cache_pickup() to pick-up (read) the objects from the socket
631 * and fill them into the cache.
632 *
633 * @see nl_cache_pickup(), nl_cache_resync()
634 *
635 * @return 0 on success or a negative error code. Some implementations
636 * of co_request_update() return a positive number on success that is
637 * the number of bytes sent. Treat any non-negative number as success too.
638 */
639static int nl_cache_request_full_dump(struct nl_sock *sk,
640 struct nl_cache *cache)
641{
642 if (sk->s_proto != cache->c_ops->co_protocol)
643 return -NLE_PROTO_MISMATCH;
644
645 if (cache->c_ops->co_request_update == NULL)
646 return -NLE_OPNOTSUPP;
647
648 NL_DBG(2, "Requesting update from kernel for cache %p <%s>\n",
649 cache, nl_cache_name(cache));
650
651 return cache->c_ops->co_request_update(cache, sk);
652}
653
654/** @cond SKIP */
655struct update_xdata {
656 struct nl_cache_ops *ops;
657 struct nl_parser_param *params;
658};
659
660static int update_msg_parser(struct nl_msg *msg, void *arg)
661{
662 struct update_xdata *x = arg;
663 int ret = 0;
664
665 ret = nl_cache_parse(x->ops, &msg->nm_src, msg->nm_nlh, x->params);
666 if (ret == -NLE_EXIST)
667 return NL_SKIP;
668 else
669 return ret;
670}
671/** @endcond */
672
673/**
674 * Pick-up a netlink request-update with your own parser
675 * @arg sk Netlink socket
676 * @arg cache Cache
677 * @arg param Parser parameters
678 */
679static int __cache_pickup(struct nl_sock *sk, struct nl_cache *cache,
680 struct nl_parser_param *param)
681{
682 int err;
683 struct nl_cb *cb;
684 struct update_xdata x = {
685 .ops = cache->c_ops,
686 .params = param,
687 };
688
689 NL_DBG(2, "Picking up answer for cache %p <%s>\n",
690 cache, nl_cache_name(cache));
691
692 cb = nl_cb_clone(sk->s_cb);
693 if (cb == NULL)
694 return -NLE_NOMEM;
695
696 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, update_msg_parser, &x);
697
698 err = nl_recvmsgs(sk, cb);
699 if (err < 0)
700 NL_DBG(2, "While picking up for %p <%s>, recvmsgs() returned %d: %s\n",
701 cache, nl_cache_name(cache), err, nl_geterror(err));
702
703 nl_cb_put(cb);
704
705 return err;
706}
707
708static int pickup_checkdup_cb(struct nl_object *c, struct nl_parser_param *p)
709{
710 struct nl_cache *cache = (struct nl_cache *)p->pp_arg;
711 _nl_auto_nl_object struct nl_object *old = NULL;
712
713 old = nl_cache_search(cache, c);
714 if (old) {
715 if (nl_object_update(old, c) == 0)
716 return 0;
717
718 nl_cache_remove(old);
719 }
720
721 return nl_cache_add(cache, c);
722}
723
724static int pickup_cb(struct nl_object *c, struct nl_parser_param *p)
725{
726 struct nl_cache *cache = p->pp_arg;
727
728 return nl_cache_add(cache, c);
729}
730
731static int __nl_cache_pickup(struct nl_sock *sk, struct nl_cache *cache,
732 int checkdup)
733{
734 struct nl_parser_param p;
735
736 p.pp_cb = checkdup ? pickup_checkdup_cb : pickup_cb;
737 p.pp_arg = cache;
738
739 if (sk->s_proto != cache->c_ops->co_protocol)
740 return -NLE_PROTO_MISMATCH;
741
742 return __cache_pickup(sk, cache, &p);
743}
744
745/**
746 * Pickup a netlink dump response and put it into a cache.
747 * @arg sk Netlink socket.
748 * @arg cache Cache to put items into.
749 *
750 * Waits for netlink messages to arrive, parses them and puts them into
751 * the specified cache. If an old object with same key attributes is
752 * present in the cache, it is replaced with the new object.
753 * If the old object type supports an update operation, an update is
754 * attempted before a replace.
755 *
756 * @return 0 on success or a negative error code.
757 */
758 int nl_cache_pickup_checkdup(struct nl_sock *sk, struct nl_cache *cache)
759{
760 return __nl_cache_pickup(sk, cache, 1);
761}
762
763/**
764 * Pickup a netlink dump response and put it into a cache.
765 * @arg sk Netlink socket.
766 * @arg cache Cache to put items into.
767 *
768 * Waits for netlink messages to arrive, parses them and puts them into
769 * the specified cache.
770 *
771 * @return 0 on success or a negative error code.
772 */
773 int nl_cache_pickup(struct nl_sock *sk, struct nl_cache *cache)
774{
775 return __nl_cache_pickup(sk, cache, 0);
776}
777
778static int cache_include(struct nl_cache *cache, struct nl_object *obj,
779 struct nl_msgtype *type, change_func_t cb,
780 change_func_v2_t cb_v2, void *data)
781{
782 _nl_auto_nl_object struct nl_object *old = NULL;
783 _nl_auto_nl_object struct nl_object *clone = NULL;
784 uint64_t diff = 0;
785
786 switch (type->mt_act) {
787 case NL_ACT_NEW:
788 case NL_ACT_DEL:
789 old = nl_cache_search(cache, obj);
790 if (old) {
791 if (cb_v2 && old->ce_ops->oo_update) {
792 clone = nl_object_clone(old);
793 diff = nl_object_diff64(old, obj);
794 }
795 /*
796 * Some objects types might support merging the new
797 * object with the old existing cache object.
798 * Handle them first.
799 */
800 if (nl_object_update(old, obj) == 0) {
801 if (cb_v2) {
802 cb_v2(cache, clone, old, diff,
803 NL_ACT_CHANGE, data);
804 } else if (cb)
805 cb(cache, old, NL_ACT_CHANGE, data);
806 return 0;
807 }
808 nl_cache_remove(old);
809 if (type->mt_act == NL_ACT_DEL) {
810 if (cb_v2)
811 cb_v2(cache, old, NULL, 0, NL_ACT_DEL,
812 data);
813 else if (cb)
814 cb(cache, old, NL_ACT_DEL, data);
815 }
816 }
817
818 if (type->mt_act == NL_ACT_NEW) {
819 nl_cache_move(cache, obj);
820 if (old == NULL) {
821 if (cb_v2) {
822 cb_v2(cache, NULL, obj, 0, NL_ACT_NEW,
823 data);
824 } else if (cb)
825 cb(cache, obj, NL_ACT_NEW, data);
826 } else if (old) {
827 diff = 0;
828 if (cb || cb_v2)
829 diff = nl_object_diff64(old, obj);
830 if (diff && cb_v2) {
831 cb_v2(cache, old, obj, diff, NL_ACT_CHANGE,
832 data);
833 } else if (diff && cb)
834 cb(cache, obj, NL_ACT_CHANGE, data);
835
836 }
837 }
838 break;
839 default:
840 NL_DBG(2, "Unknown action associated to object %p\n", obj);
841 return 0;
842 }
843
844 return 0;
845}
846
847int nl_cache_include(struct nl_cache *cache, struct nl_object *obj,
848 change_func_t change_cb, void *data)
849{
850 struct nl_cache_ops *ops = cache->c_ops;
851 int i;
852
853 if (ops->co_obj_ops != obj->ce_ops)
854 return -NLE_OBJ_MISMATCH;
855
856 for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++)
857 if (ops->co_msgtypes[i].mt_id == obj->ce_msgtype)
858 return cache_include(cache, obj, &ops->co_msgtypes[i],
859 change_cb, NULL, data);
860
861 NL_DBG(3, "Object %p does not seem to belong to cache %p <%s>\n",
862 obj, cache, nl_cache_name(cache));
863
864 return -NLE_MSGTYPE_NOSUPPORT;
865}
866
867int nl_cache_include_v2(struct nl_cache *cache, struct nl_object *obj,
868 change_func_v2_t change_cb, void *data)
869{
870 struct nl_cache_ops *ops = cache->c_ops;
871 int i;
872
873 if (ops->co_obj_ops != obj->ce_ops)
874 return -NLE_OBJ_MISMATCH;
875
876 for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++)
877 if (ops->co_msgtypes[i].mt_id == obj->ce_msgtype)
878 return cache_include(cache, obj, &ops->co_msgtypes[i],
879 NULL, change_cb, data);
880
881 NL_DBG(3, "Object %p does not seem to belong to cache %p <%s>\n",
882 obj, cache, nl_cache_name(cache));
883
884 return -NLE_MSGTYPE_NOSUPPORT;
885}
886
887static int resync_cb(struct nl_object *c, struct nl_parser_param *p)
888{
889 struct nl_cache_assoc *ca = p->pp_arg;
890
891 if (ca->ca_change_v2)
892 return nl_cache_include_v2(ca->ca_cache, c, ca->ca_change_v2,
893 ca->ca_change_data);
894 else
895 return nl_cache_include(ca->ca_cache, c, ca->ca_change,
896 ca->ca_change_data);
897}
898
899static int cache_resync(struct nl_sock *sk, struct nl_cache *cache,
900 change_func_t change_cb, change_func_v2_t change_cb_v2,
901 void *data)
902{
903 struct nl_object *obj, *next;
904 struct nl_af_group *grp;
905 struct nl_cache_assoc ca = {
906 .ca_cache = cache,
907 .ca_change = change_cb,
908 .ca_change_v2 = change_cb_v2,
909 .ca_change_data = data,
910 };
911 struct nl_parser_param p = {
912 .pp_cb = resync_cb,
913 .pp_arg = &ca,
914 };
915 int err;
916
917 if (sk->s_proto != cache->c_ops->co_protocol)
918 return -NLE_PROTO_MISMATCH;
919
920 NL_DBG(1, "Resyncing cache %p <%s>...\n", cache, nl_cache_name(cache));
921
922 /* Mark all objects so we can see if some of them are obsolete */
923 nl_cache_mark_all(cache);
924
925 grp = cache->c_ops->co_groups;
926 do {
927 if (grp && grp->ag_group &&
928 (cache->c_flags & NL_CACHE_AF_ITER))
929 nl_cache_set_arg1(cache, grp->ag_family);
930
931restart:
932 err = nl_cache_request_full_dump(sk, cache);
933 if (err < 0)
934 goto errout;
935
936 err = __cache_pickup(sk, cache, &p);
937 if (err == -NLE_DUMP_INTR)
938 goto restart;
939 else if (err < 0)
940 goto errout;
941
942 if (grp)
943 grp++;
944 } while (grp && grp->ag_group &&
945 (cache->c_flags & NL_CACHE_AF_ITER));
946
947 nl_list_for_each_entry_safe(obj, next, &cache->c_items, ce_list) {
948 if (nl_object_is_marked(obj)) {
949 nl_object_get(obj);
950 nl_cache_remove(obj);
951 if (change_cb)
952 change_cb(cache, obj, NL_ACT_DEL, data);
953 else if (change_cb_v2)
954 change_cb_v2(cache, obj, NULL, 0, NL_ACT_DEL,
955 data);
956 nl_object_put(obj);
957 }
958 }
959
960 NL_DBG(1, "Finished resyncing %p <%s>\n", cache, nl_cache_name(cache));
961
962 err = 0;
963errout:
964 return err;
965}
966
967int nl_cache_resync(struct nl_sock *sk, struct nl_cache *cache,
968 change_func_t change_cb, void *data)
969{
970 return cache_resync(sk, cache, change_cb, NULL, data);
971}
972
973int nl_cache_resync_v2(struct nl_sock *sk, struct nl_cache *cache,
974 change_func_v2_t change_cb_v2, void *data)
975{
976 return cache_resync(sk, cache, NULL, change_cb_v2, data);
977}
978
979/** @} */
980
981/**
982 * @name Parsing
983 * @{
984 */
985
986/** @cond SKIP */
987int nl_cache_parse(struct nl_cache_ops *ops, struct sockaddr_nl *who,
988 struct nlmsghdr *nlh, struct nl_parser_param *params)
989{
990 int i, err;
991
992 if (!nlmsg_valid_hdr(nlh, ops->co_hdrsize))
993 return -NLE_MSG_TOOSHORT;
994
995 for (i = 0; ops->co_msgtypes[i].mt_id >= 0; i++) {
996 if (ops->co_msgtypes[i].mt_id == nlh->nlmsg_type) {
997 err = ops->co_msg_parser(ops, who, nlh, params);
998 if (err != -NLE_OPNOTSUPP)
999 goto errout;
1000 }
1001 }
1002
1003
1004 err = -NLE_MSGTYPE_NOSUPPORT;
1005errout:
1006 return err;
1007}
1008/** @endcond */
1009
1010/**
1011 * Parse a netlink message and add it to the cache.
1012 * @arg cache cache to add element to
1013 * @arg msg netlink message
1014 *
1015 * Parses a netlink message by calling the cache specific message parser
1016 * and adds the new element to the cache. If an old object with same key
1017 * attributes is present in the cache, it is replaced with the new object.
1018 * If the old object type supports an update operation, an update is
1019 * attempted before a replace.
1020 *
1021 * @return 0 or a negative error code.
1022 */
1023 int nl_cache_parse_and_add(struct nl_cache *cache, struct nl_msg *msg)
1024{
1025 struct nl_parser_param p = {
1026 .pp_cb = pickup_cb,
1027 .pp_arg = cache,
1028 };
1029
1030 return nl_cache_parse(cache->c_ops, NULL, nlmsg_hdr(msg), &p);
1031}
1032
1033/**
1034 * (Re)fill a cache with the contents in the kernel.
1035 * @arg sk Netlink socket.
1036 * @arg cache cache to update
1037 *
1038 * Clears the specified cache and fills it with the current state in
1039 * the kernel.
1040 *
1041 * @return 0 or a negative error code.
1042 */
1043 int nl_cache_refill(struct nl_sock *sk, struct nl_cache *cache)
1044{
1045 struct nl_af_group *grp;
1046 int err;
1047
1048 if (sk->s_proto != cache->c_ops->co_protocol)
1049 return -NLE_PROTO_MISMATCH;
1050
1051 nl_cache_clear(cache);
1052 grp = cache->c_ops->co_groups;
1053 do {
1054 if (grp && grp->ag_group &&
1055 (cache->c_flags & NL_CACHE_AF_ITER))
1056 nl_cache_set_arg1(cache, grp->ag_family);
1057
1058restart:
1059 err = nl_cache_request_full_dump(sk, cache);
1060 if (err < 0)
1061 return err;
1062
1063 NL_DBG(2, "Updating cache %p <%s> for family %u, request sent, waiting for reply\n",
1064 cache, nl_cache_name(cache), grp ? grp->ag_family : AF_UNSPEC);
1065
1066 err = nl_cache_pickup(sk, cache);
1067 if (err == -NLE_DUMP_INTR) {
1068 NL_DBG(2, "Dump interrupted, restarting!\n");
1069 goto restart;
1070 } else if (err < 0)
1071 break;
1072
1073 if (grp)
1074 grp++;
1075 } while (grp && grp->ag_group &&
1076 (cache->c_flags & NL_CACHE_AF_ITER));
1077
1078 return err;
1079}
1080
1081/** @} */
1082
1083/**
1084 * @name Utillities
1085 * @{
1086 */
1087static struct nl_object *__cache_fast_lookup(struct nl_cache *cache,
1088 struct nl_object *needle)
1089{
1090 struct nl_object *obj;
1091
1092 obj = nl_rhash_table_lookup(cache->hashtable, needle);
1093 if (obj) {
1094 nl_object_get(obj);
1095 return obj;
1096 }
1097
1098 return NULL;
1099}
1100
1101/**
1102 * Search object in cache
1103 * @arg cache Cache
1104 * @arg needle Object to look for.
1105 *
1106 * Searches the cache for an object which matches the object \p needle.
1107 * The function nl_object_identical() is used to determine if the
1108 * objects match. If a matching object is found, the reference counter
1109 * is incremented and the object is returned.
1110 *
1111 * Therefore, if an object is returned, the reference to the object
1112 * must be returned by calling nl_object_put() after usage.
1113 *
1114 * @return Reference to object or NULL if not found.
1115 */
1116 struct nl_object *nl_cache_search(struct nl_cache *cache,
1117 struct nl_object *needle)
1118{
1119 struct nl_object *obj;
1120
1121 if (cache->hashtable)
1122 return __cache_fast_lookup(cache, needle);
1123
1124 nl_list_for_each_entry(obj, &cache->c_items, ce_list) {
1125 if (nl_object_identical(obj, needle)) {
1126 nl_object_get(obj);
1127 return obj;
1128 }
1129 }
1130
1131 return NULL;
1132}
1133
1134/**
1135 * Find object in cache
1136 * @arg cache Cache
1137 * @arg filter object acting as a filter
1138 *
1139 * Searches the cache for an object which matches the object filter.
1140 * If the filter attributes matches the object type id attributes,
1141 * and the cache supports hash lookups, a faster hashtable lookup
1142 * is used to return the object. Else, function nl_object_match_filter() is
1143 * used to determine if the objects match. If a matching object is
1144 * found, the reference counter is incremented and the object is returned.
1145 *
1146 * Therefore, if an object is returned, the reference to the object
1147 * must be returned by calling nl_object_put() after usage.
1148 *
1149 * @return Reference to object or NULL if not found.
1150 */
1151 struct nl_object *nl_cache_find(struct nl_cache *cache,
1152 struct nl_object *filter)
1153{
1154 struct nl_object *obj;
1155
1156 if (cache->c_ops == NULL)
1157 BUG();
1158
1159 if ((nl_object_get_id_attrs(filter) == filter->ce_mask)
1160 && cache->hashtable)
1161 return __cache_fast_lookup(cache, filter);
1162
1163 nl_list_for_each_entry(obj, &cache->c_items, ce_list) {
1164 if (nl_object_match_filter(obj, filter)) {
1165 nl_object_get(obj);
1166 return obj;
1167 }
1168 }
1169
1170 return NULL;
1171}
1172
1173/**
1174 * Mark all objects of a cache
1175 * @arg cache Cache
1176 *
1177 * Marks all objects of a cache by calling nl_object_mark() on each
1178 * object associated with the cache.
1179 */
1180 void nl_cache_mark_all(struct nl_cache *cache)
1181{
1182 struct nl_object *obj;
1183
1184 NL_DBG(2, "Marking all objects in cache %p <%s>\n",
1185 cache, nl_cache_name(cache));
1186
1187 nl_list_for_each_entry(obj, &cache->c_items, ce_list)
1188 nl_object_mark(obj);
1189}
1190
1191/** @} */
1192
1193/**
1194 * @name Dumping
1195 * @{
1196 */
1197
1198/**
1199 * Dump all elements of a cache.
1200 * @arg cache cache to dump
1201 * @arg params dumping parameters
1202 *
1203 * Dumps all elements of the \a cache to the file descriptor \a fd.
1204 */
1205 void nl_cache_dump(struct nl_cache *cache, struct nl_dump_params *params)
1206{
1207 nl_cache_dump_filter(cache, params, NULL);
1208}
1209
1210/**
1211 * Dump all elements of a cache (filtered).
1212 * @arg cache cache to dump
1213 * @arg params dumping parameters
1214 * @arg filter filter object
1215 *
1216 * Dumps all elements of the \a cache to the file descriptor \a fd
1217 * given they match the given filter \a filter.
1218 */
1219 void nl_cache_dump_filter(struct nl_cache *cache,
1220 struct nl_dump_params *params,
1221 struct nl_object *filter)
1222{
1223 struct nl_dump_params params_copy;
1224 struct nl_object_ops *ops;
1225 struct nl_object *obj;
1226 int type;
1227
1228 NL_DBG(2, "Dumping cache %p <%s> with filter %p\n",
1229 cache, nl_cache_name(cache), filter);
1230
1231 if (!params) {
1232 /* It doesn't really make sense that @params is an optional parameter. In the
1233 * past, nl_cache_dump() was documented that the @params would be optional, so
1234 * try to save it.
1235 *
1236 * Note that this still isn't useful, because we don't set any dump option.
1237 * It only exists not to crash applications that wrongly pass %NULL here. */
1238 _nl_assert_not_reached ();
1239 params_copy = (struct nl_dump_params) {
1240 .dp_type = NL_DUMP_DETAILS,
1241 };
1242 params = &params_copy;
1243 }
1244
1245 type = params->dp_type;
1246
1247 if (type > NL_DUMP_MAX || type < 0)
1248 BUG();
1249
1250 if (cache->c_ops == NULL)
1251 BUG();
1252
1253 ops = cache->c_ops->co_obj_ops;
1254 if (!ops->oo_dump[type])
1255 return;
1256
1257 if (params->dp_buf)
1258 memset(params->dp_buf, 0, params->dp_buflen);
1259
1260 nl_list_for_each_entry(obj, &cache->c_items, ce_list) {
1261 if (filter && !nl_object_match_filter(obj, filter))
1262 continue;
1263
1264 NL_DBG(4, "Dumping object %p...\n", obj);
1265 dump_from_ops(obj, params);
1266 }
1267}
1268
1269/** @} */
1270
1271/**
1272 * @name Iterators
1273 * @{
1274 */
1275
1276/**
1277 * Call a callback on each element of the cache.
1278 * @arg cache cache to iterate on
1279 * @arg cb callback function
1280 * @arg arg argument passed to callback function
1281 *
1282 * Calls a callback function \a cb on each element of the \a cache.
1283 * The argument \a arg is passed on the callback function.
1284 */
1285 void nl_cache_foreach(struct nl_cache *cache,
1286 void (*cb)(struct nl_object *, void *), void *arg)
1287{
1288 nl_cache_foreach_filter(cache, NULL, cb, arg);
1289}
1290
1291/**
1292 * Call a callback on each element of the cache (filtered).
1293 * @arg cache cache to iterate on
1294 * @arg filter filter object
1295 * @arg cb callback function
1296 * @arg arg argument passed to callback function
1297 *
1298 * Calls a callback function \a cb on each element of the \a cache
1299 * that matches the \a filter. The argument \a arg is passed on
1300 * to the callback function.
1301 */
1302 void nl_cache_foreach_filter(struct nl_cache *cache, struct nl_object *filter,
1303 void (*cb)(struct nl_object *, void *), void *arg)
1304{
1305 struct nl_object *obj, *tmp;
1306
1307 if (cache->c_ops == NULL)
1308 BUG();
1309
1310 nl_list_for_each_entry_safe(obj, tmp, &cache->c_items, ce_list) {
1311 if (filter) {
1312 int diff = nl_object_match_filter(obj, filter);
1313
1314 NL_DBG(3, "%p<->%p object difference: %x\n",
1315 obj, filter, diff);
1316
1317 if (!diff)
1318 continue;
1319 }
1320
1321 /* Caller may hold obj for a long time */
1322 nl_object_get(obj);
1323
1324 cb(obj, arg);
1325
1326 nl_object_put(obj);
1327 }
1328}
1329
1330/** @} */
1331
1332/** @} */
nl_cache_ops_lookup_safe
struct nl_cache_ops * nl_cache_ops_lookup_safe(const char *name)
Lookup cache operations by name.
Definition cache_mngt.c:99
nl_cache_ops_put
void nl_cache_ops_put(struct nl_cache_ops *ops)
Decrement reference counter.
Definition cache_mngt.c:65
nl_cache_refill
int nl_cache_refill(struct nl_sock *sk, struct nl_cache *cache)
(Re)fill a cache with the contents in the kernel.
Definition cache.c:1043
nl_cache_set_flags
void nl_cache_set_flags(struct nl_cache *cache, unsigned int flags)
Set cache flags.
Definition cache.c:608
nl_cache_set_arg1
void nl_cache_set_arg1(struct nl_cache *cache, int arg)
Set synchronization arg1 of cache.
Definition cache.c:585
nl_cache_search
struct nl_object * nl_cache_search(struct nl_cache *cache, struct nl_object *needle)
Search object in cache.
Definition cache.c:1116
nl_cache_foreach
void nl_cache_foreach(struct nl_cache *cache, void(*cb)(struct nl_object *, void *), void *arg)
Call a callback on each element of the cache.
Definition cache.c:1285
nl_cache_nitems
int nl_cache_nitems(struct nl_cache *cache)
Return the number of items in the cache.
Definition cache.c:70
nl_cache_find
struct nl_object * nl_cache_find(struct nl_cache *cache, struct nl_object *filter)
Find object in cache.
Definition cache.c:1151
nl_cache_free
void nl_cache_free(struct nl_cache *cache)
Free a cache.
Definition cache.c:403
nl_cache_get
void nl_cache_get(struct nl_cache *cache)
Increase reference counter of cache.
Definition cache.c:386
nl_cache_nitems_filter
int nl_cache_nitems_filter(struct nl_cache *cache, struct nl_object *filter)
Return the number of items matching a filter in the cache.
Definition cache.c:80
nl_cache_dump_filter
void nl_cache_dump_filter(struct nl_cache *cache, struct nl_dump_params *params, struct nl_object *filter)
Dump all elements of a cache (filtered).
Definition cache.c:1219
nl_cache_add
int nl_cache_add(struct nl_cache *cache, struct nl_object *obj)
Add object to cache.
Definition cache.c:474
nl_cache_foreach_filter
void nl_cache_foreach_filter(struct nl_cache *cache, struct nl_object *filter, void(*cb)(struct nl_object *, void *), void *arg)
Call a callback on each element of the cache (filtered).
Definition cache.c:1302
nl_cache_pickup
int nl_cache_pickup(struct nl_sock *sk, struct nl_cache *cache)
Pickup a netlink dump response and put it into a cache.
Definition cache.c:773
NL_CACHE_AF_ITER
#define NL_CACHE_AF_ITER
Explicitely iterate over all address families when updating the cache.
Definition cache.h:39
nl_cache_parse_and_add
int nl_cache_parse_and_add(struct nl_cache *cache, struct nl_msg *msg)
Parse a netlink message and add it to the cache.
Definition cache.c:1023
nl_cache_get_last
struct nl_object * nl_cache_get_last(struct nl_cache *cache)
Return the last element in the cache.
Definition cache.c:134
nl_cache_alloc
struct nl_cache * nl_cache_alloc(struct nl_cache_ops *ops)
Allocate new cache.
Definition cache.c:185
nl_cache_get_next
struct nl_object * nl_cache_get_next(struct nl_object *obj)
Return the next element in the cache.
Definition cache.c:147
nl_cache_remove
void nl_cache_remove(struct nl_object *obj)
Remove object from cache.
Definition cache.c:546
nl_cache_dump
void nl_cache_dump(struct nl_cache *cache, struct nl_dump_params *params)
Dump all elements of a cache.
Definition cache.c:1205
nl_cache_is_empty
int nl_cache_is_empty(struct nl_cache *cache)
Returns true if the cache is empty.
Definition cache.c:103
nl_cache_alloc_and_fill
int nl_cache_alloc_and_fill(struct nl_cache_ops *ops, struct nl_sock *sock, struct nl_cache **result)
Allocate new cache and fill it.
Definition cache.c:228
nl_cache_get_first
struct nl_object * nl_cache_get_first(struct nl_cache *cache)
Return the first element in the cache.
Definition cache.c:121
nl_cache_pickup_checkdup
int nl_cache_pickup_checkdup(struct nl_sock *sk, struct nl_cache *cache)
Pickup a netlink dump response and put it into a cache.
Definition cache.c:758
nl_cache_get_prev
struct nl_object * nl_cache_get_prev(struct nl_object *obj)
Return the previous element in the cache.
Definition cache.c:160
nl_cache_subset
struct nl_cache * nl_cache_subset(struct nl_cache *orig, struct nl_object *filter)
Allocate new cache containing a subset of an existing cache.
Definition cache.c:292
nl_cache_alloc_name
int nl_cache_alloc_name(const char *kind, struct nl_cache **result)
Allocate new cache based on type name.
Definition cache.c:259
nl_cache_clear
void nl_cache_clear(struct nl_cache *cache)
Remove all objects of a cache.
Definition cache.c:361
nl_cache_clone
struct nl_cache * nl_cache_clone(struct nl_cache *cache)
Allocate new cache and copy the contents of an existing cache.
Definition cache.c:332
nl_cache_set_arg2
void nl_cache_set_arg2(struct nl_cache *cache, int arg)
Set synchronization arg2 of cache.
Definition cache.c:598
nl_cache_get_ops
struct nl_cache_ops * nl_cache_get_ops(struct nl_cache *cache)
Return the operations set of the cache.
Definition cache.c:112
nl_cache_move
int nl_cache_move(struct nl_cache *cache, struct nl_object *obj)
Move object from one cache to another.
Definition cache.c:518
nl_cache_mark_all
void nl_cache_mark_all(struct nl_cache *cache)
Mark all objects of a cache.
Definition cache.c:1180
nl_cb_set
int nl_cb_set(struct nl_cb *cb, enum nl_cb_type type, enum nl_cb_kind kind, nl_recvmsg_msg_cb_t func, void *arg)
Set up a callback.
Definition handlers.c:290
nl_cb_clone
struct nl_cb * nl_cb_clone(struct nl_cb *orig)
Clone an existing callback handle.
Definition handlers.c:227
NL_SKIP
@ NL_SKIP
Skip this message.
Definition handlers.h:60
NL_CB_VALID
@ NL_CB_VALID
Message is valid.
Definition handlers.h:89
NL_CB_CUSTOM
@ NL_CB_CUSTOM
Customized handler specified by the user.
Definition handlers.h:77
nl_rhash_table_free
void nl_rhash_table_free(nl_rhash_table_t *ht)
Free resizeable hashtable including all nodes.
Definition hashtable.c:306
nl_rhash_table_add
int nl_rhash_table_add(nl_rhash_table_t *ht, struct nl_object *obj)
Add object to resizeable hashtable.
Definition hashtable.c:341
nl_rhash_table_del
int nl_rhash_table_del(nl_rhash_table_t *ht, struct nl_object *obj)
Remove object from resizeable hashtable.
Definition hashtable.c:379
nl_rhash_table_lookup
struct nl_object * nl_rhash_table_lookup(nl_rhash_table_t *ht, struct nl_object *obj)
Lookup identical object in resizeable hashtable.
Definition hashtable.c:322
nl_rhash_table_alloc
nl_rhash_table_t * nl_rhash_table_alloc(void)
Allocate resizeable hashtable.
Definition hashtable.c:279
nlmsg_hdr
struct nlmsghdr * nlmsg_hdr(struct nl_msg *n)
Return actual netlink message.
Definition msg.c:550
nl_object_update
int nl_object_update(struct nl_object *dst, struct nl_object *src)
Merge a cacheable object.
Definition object.c:160
nl_object_clone
struct nl_object * nl_object_clone(struct nl_object *obj)
Allocate a new object and copy all data from an existing object.
Definition object.c:111
nl_object_diff64
uint64_t nl_object_diff64(struct nl_object *a, struct nl_object *b)
Compute bitmask representing difference in attribute values.
Definition object.c:371
nl_object_get_id_attrs
uint32_t nl_object_get_id_attrs(struct nl_object *obj)
Return object id attribute mask.
Definition object.c:561
nl_object_put
void nl_object_put(struct nl_object *obj)
Release a reference from an object.
Definition object.c:221
nl_object_identical
int nl_object_identical(struct nl_object *a, struct nl_object *b)
Check if the identifiers of two objects are identical.
Definition object.c:319
nl_object_get
void nl_object_get(struct nl_object *obj)
Acquire a reference on a object.
Definition object.c:210
nl_object_match_filter
int nl_object_match_filter(struct nl_object *obj, struct nl_object *filter)
Match a filter against an object.
Definition object.c:415
nl_object_is_marked
int nl_object_is_marked(struct nl_object *obj)
Return true if object is marked.
Definition object.c:277
nl_object_mark
void nl_object_mark(struct nl_object *obj)
Add mark to object.
Definition object.c:258
nl_recvmsgs
int nl_recvmsgs(struct nl_sock *sk, struct nl_cb *cb)
Receive a set of messages from a netlink socket.
Definition nl.c:1080
NL_DUMP_DETAILS
@ NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition types.h:21
nl_cb
Definition nl-core.h:10
nl_dump_params
Dumping parameters.
Definition types.h:32
nl_dump_params::dp_type
enum nl_dump_type dp_type
Specifies the type of dump that is requested.
Definition types.h:36