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10#include <linux/etherdevice.h>
11#include <linux/list.h>
12#include <linux/random.h>
13#include <linux/slab.h>
14#include <linux/spinlock.h>
15#include <linux/string.h>
16#include <net/mac80211.h>
17#include "wme.h"
18#include "ieee80211_i.h"
19#include "mesh.h"
20
21static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath);
22
23static u32 mesh_table_hash(const void *addr, u32 len, u32 seed)
24{
25
26 return jhash_1word(*(u32 *)(addr+2), seed);
27}
28
29static const struct rhashtable_params mesh_rht_params = {
30 .nelem_hint = 2,
31 .automatic_shrinking = true,
32 .key_len = ETH_ALEN,
33 .key_offset = offsetof(struct mesh_path, dst),
34 .head_offset = offsetof(struct mesh_path, rhash),
35 .hashfn = mesh_table_hash,
36};
37
38static inline bool mpath_expired(struct mesh_path *mpath)
39{
40 return (mpath->flags & MESH_PATH_ACTIVE) &&
41 time_after(jiffies, mpath->exp_time) &&
42 !(mpath->flags & MESH_PATH_FIXED);
43}
44
45static void mesh_path_rht_free(void *ptr, void *tblptr)
46{
47 struct mesh_path *mpath = ptr;
48 struct mesh_table *tbl = tblptr;
49
50 mesh_path_free_rcu(tbl, mpath);
51}
52
53static struct mesh_table *mesh_table_alloc(void)
54{
55 struct mesh_table *newtbl;
56
57 newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC);
58 if (!newtbl)
59 return NULL;
60
61 INIT_HLIST_HEAD(&newtbl->known_gates);
62 atomic_set(&newtbl->entries, 0);
63 spin_lock_init(&newtbl->gates_lock);
64
65 return newtbl;
66}
67
68static void mesh_table_free(struct mesh_table *tbl)
69{
70 rhashtable_free_and_destroy(&tbl->rhead,
71 mesh_path_rht_free, tbl);
72 kfree(tbl);
73}
74
75
76
77
78
79
80
81
82
83
84void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta)
85{
86 struct sk_buff *skb;
87 struct ieee80211_hdr *hdr;
88 unsigned long flags;
89
90 rcu_assign_pointer(mpath->next_hop, sta);
91
92 spin_lock_irqsave(&mpath->frame_queue.lock, flags);
93 skb_queue_walk(&mpath->frame_queue, skb) {
94 hdr = (struct ieee80211_hdr *) skb->data;
95 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
96 memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN);
97 ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr);
98 }
99
100 spin_unlock_irqrestore(&mpath->frame_queue.lock, flags);
101}
102
103static void prepare_for_gate(struct sk_buff *skb, char *dst_addr,
104 struct mesh_path *gate_mpath)
105{
106 struct ieee80211_hdr *hdr;
107 struct ieee80211s_hdr *mshdr;
108 int mesh_hdrlen, hdrlen;
109 char *next_hop;
110
111 hdr = (struct ieee80211_hdr *) skb->data;
112 hdrlen = ieee80211_hdrlen(hdr->frame_control);
113 mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
114
115 if (!(mshdr->flags & MESH_FLAGS_AE)) {
116
117 mesh_hdrlen = 6;
118
119
120 skb_push(skb, 2 * ETH_ALEN);
121 memmove(skb->data, hdr, hdrlen + mesh_hdrlen);
122
123 hdr = (struct ieee80211_hdr *) skb->data;
124
125
126
127 mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
128 mshdr->flags = MESH_FLAGS_AE_A5_A6;
129 memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN);
130 memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN);
131 }
132
133
134 hdr = (struct ieee80211_hdr *) skb->data;
135 rcu_read_lock();
136 next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr;
137 memcpy(hdr->addr1, next_hop, ETH_ALEN);
138 rcu_read_unlock();
139 memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN);
140 memcpy(hdr->addr3, dst_addr, ETH_ALEN);
141}
142
143
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159
160
161static void mesh_path_move_to_queue(struct mesh_path *gate_mpath,
162 struct mesh_path *from_mpath,
163 bool copy)
164{
165 struct sk_buff *skb, *fskb, *tmp;
166 struct sk_buff_head failq;
167 unsigned long flags;
168
169 if (WARN_ON(gate_mpath == from_mpath))
170 return;
171 if (WARN_ON(!gate_mpath->next_hop))
172 return;
173
174 __skb_queue_head_init(&failq);
175
176 spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
177 skb_queue_splice_init(&from_mpath->frame_queue, &failq);
178 spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
179
180 skb_queue_walk_safe(&failq, fskb, tmp) {
181 if (skb_queue_len(&gate_mpath->frame_queue) >=
182 MESH_FRAME_QUEUE_LEN) {
183 mpath_dbg(gate_mpath->sdata, "mpath queue full!\n");
184 break;
185 }
186
187 skb = skb_copy(fskb, GFP_ATOMIC);
188 if (WARN_ON(!skb))
189 break;
190
191 prepare_for_gate(skb, gate_mpath->dst, gate_mpath);
192 skb_queue_tail(&gate_mpath->frame_queue, skb);
193
194 if (copy)
195 continue;
196
197 __skb_unlink(fskb, &failq);
198 kfree_skb(fskb);
199 }
200
201 mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n",
202 gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue));
203
204 if (!copy)
205 return;
206
207 spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
208 skb_queue_splice(&failq, &from_mpath->frame_queue);
209 spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
210}
211
212
213static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst,
214 struct ieee80211_sub_if_data *sdata)
215{
216 struct mesh_path *mpath;
217
218 mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params);
219
220 if (mpath && mpath_expired(mpath)) {
221 spin_lock_bh(&mpath->state_lock);
222 mpath->flags &= ~MESH_PATH_ACTIVE;
223 spin_unlock_bh(&mpath->state_lock);
224 }
225 return mpath;
226}
227
228
229
230
231
232
233
234
235
236
237struct mesh_path *
238mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
239{
240 return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata);
241}
242
243struct mesh_path *
244mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
245{
246 return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata);
247}
248
249static struct mesh_path *
250__mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx)
251{
252 int i = 0, ret;
253 struct mesh_path *mpath = NULL;
254 struct rhashtable_iter iter;
255
256 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
257 if (ret)
258 return NULL;
259
260 rhashtable_walk_start(&iter);
261
262 while ((mpath = rhashtable_walk_next(&iter))) {
263 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
264 continue;
265 if (IS_ERR(mpath))
266 break;
267 if (i++ == idx)
268 break;
269 }
270 rhashtable_walk_stop(&iter);
271 rhashtable_walk_exit(&iter);
272
273 if (IS_ERR(mpath) || !mpath)
274 return NULL;
275
276 if (mpath_expired(mpath)) {
277 spin_lock_bh(&mpath->state_lock);
278 mpath->flags &= ~MESH_PATH_ACTIVE;
279 spin_unlock_bh(&mpath->state_lock);
280 }
281 return mpath;
282}
283
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289
290
291
292
293struct mesh_path *
294mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
295{
296 return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx);
297}
298
299
300
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303
304
305
306
307
308struct mesh_path *
309mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
310{
311 return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx);
312}
313
314
315
316
317
318int mesh_path_add_gate(struct mesh_path *mpath)
319{
320 struct mesh_table *tbl;
321 int err;
322
323 rcu_read_lock();
324 tbl = mpath->sdata->u.mesh.mesh_paths;
325
326 spin_lock_bh(&mpath->state_lock);
327 if (mpath->is_gate) {
328 err = -EEXIST;
329 spin_unlock_bh(&mpath->state_lock);
330 goto err_rcu;
331 }
332 mpath->is_gate = true;
333 mpath->sdata->u.mesh.num_gates++;
334
335 spin_lock(&tbl->gates_lock);
336 hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
337 spin_unlock(&tbl->gates_lock);
338
339 spin_unlock_bh(&mpath->state_lock);
340
341 mpath_dbg(mpath->sdata,
342 "Mesh path: Recorded new gate: %pM. %d known gates\n",
343 mpath->dst, mpath->sdata->u.mesh.num_gates);
344 err = 0;
345err_rcu:
346 rcu_read_unlock();
347 return err;
348}
349
350
351
352
353
354
355static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath)
356{
357 lockdep_assert_held(&mpath->state_lock);
358 if (!mpath->is_gate)
359 return;
360
361 mpath->is_gate = false;
362 spin_lock_bh(&tbl->gates_lock);
363 hlist_del_rcu(&mpath->gate_list);
364 mpath->sdata->u.mesh.num_gates--;
365 spin_unlock_bh(&tbl->gates_lock);
366
367 mpath_dbg(mpath->sdata,
368 "Mesh path: Deleted gate: %pM. %d known gates\n",
369 mpath->dst, mpath->sdata->u.mesh.num_gates);
370}
371
372
373
374
375
376int mesh_gate_num(struct ieee80211_sub_if_data *sdata)
377{
378 return sdata->u.mesh.num_gates;
379}
380
381static
382struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata,
383 const u8 *dst, gfp_t gfp_flags)
384{
385 struct mesh_path *new_mpath;
386
387 new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags);
388 if (!new_mpath)
389 return NULL;
390
391 memcpy(new_mpath->dst, dst, ETH_ALEN);
392 eth_broadcast_addr(new_mpath->rann_snd_addr);
393 new_mpath->is_root = false;
394 new_mpath->sdata = sdata;
395 new_mpath->flags = 0;
396 skb_queue_head_init(&new_mpath->frame_queue);
397 new_mpath->exp_time = jiffies;
398 spin_lock_init(&new_mpath->state_lock);
399 timer_setup(&new_mpath->timer, mesh_path_timer, 0);
400
401 return new_mpath;
402}
403
404
405
406
407
408
409
410
411
412
413struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata,
414 const u8 *dst)
415{
416 struct mesh_table *tbl;
417 struct mesh_path *mpath, *new_mpath;
418 int ret;
419
420 if (ether_addr_equal(dst, sdata->vif.addr))
421
422 return ERR_PTR(-ENOTSUPP);
423
424 if (is_multicast_ether_addr(dst))
425 return ERR_PTR(-ENOTSUPP);
426
427 if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0)
428 return ERR_PTR(-ENOSPC);
429
430 new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
431 if (!new_mpath)
432 return ERR_PTR(-ENOMEM);
433
434 tbl = sdata->u.mesh.mesh_paths;
435 do {
436 ret = rhashtable_lookup_insert_fast(&tbl->rhead,
437 &new_mpath->rhash,
438 mesh_rht_params);
439
440 if (ret == -EEXIST)
441 mpath = rhashtable_lookup_fast(&tbl->rhead,
442 dst,
443 mesh_rht_params);
444
445 } while (unlikely(ret == -EEXIST && !mpath));
446
447 if (ret && ret != -EEXIST)
448 return ERR_PTR(ret);
449
450
451
452
453
454 if (ret == -EEXIST) {
455 kfree(new_mpath);
456 new_mpath = mpath;
457 }
458 sdata->u.mesh.mesh_paths_generation++;
459 return new_mpath;
460}
461
462int mpp_path_add(struct ieee80211_sub_if_data *sdata,
463 const u8 *dst, const u8 *mpp)
464{
465 struct mesh_table *tbl;
466 struct mesh_path *new_mpath;
467 int ret;
468
469 if (ether_addr_equal(dst, sdata->vif.addr))
470
471 return -ENOTSUPP;
472
473 if (is_multicast_ether_addr(dst))
474 return -ENOTSUPP;
475
476 new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
477
478 if (!new_mpath)
479 return -ENOMEM;
480
481 memcpy(new_mpath->mpp, mpp, ETH_ALEN);
482 tbl = sdata->u.mesh.mpp_paths;
483 ret = rhashtable_lookup_insert_fast(&tbl->rhead,
484 &new_mpath->rhash,
485 mesh_rht_params);
486
487 sdata->u.mesh.mpp_paths_generation++;
488 return ret;
489}
490
491
492
493
494
495
496
497
498
499
500void mesh_plink_broken(struct sta_info *sta)
501{
502 struct ieee80211_sub_if_data *sdata = sta->sdata;
503 struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
504 static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
505 struct mesh_path *mpath;
506 struct rhashtable_iter iter;
507 int ret;
508
509 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
510 if (ret)
511 return;
512
513 rhashtable_walk_start(&iter);
514
515 while ((mpath = rhashtable_walk_next(&iter))) {
516 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
517 continue;
518 if (IS_ERR(mpath))
519 break;
520 if (rcu_access_pointer(mpath->next_hop) == sta &&
521 mpath->flags & MESH_PATH_ACTIVE &&
522 !(mpath->flags & MESH_PATH_FIXED)) {
523 spin_lock_bh(&mpath->state_lock);
524 mpath->flags &= ~MESH_PATH_ACTIVE;
525 ++mpath->sn;
526 spin_unlock_bh(&mpath->state_lock);
527 mesh_path_error_tx(sdata,
528 sdata->u.mesh.mshcfg.element_ttl,
529 mpath->dst, mpath->sn,
530 WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast);
531 }
532 }
533 rhashtable_walk_stop(&iter);
534 rhashtable_walk_exit(&iter);
535}
536
537static void mesh_path_free_rcu(struct mesh_table *tbl,
538 struct mesh_path *mpath)
539{
540 struct ieee80211_sub_if_data *sdata = mpath->sdata;
541
542 spin_lock_bh(&mpath->state_lock);
543 mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED;
544 mesh_gate_del(tbl, mpath);
545 spin_unlock_bh(&mpath->state_lock);
546 del_timer_sync(&mpath->timer);
547 atomic_dec(&sdata->u.mesh.mpaths);
548 atomic_dec(&tbl->entries);
549 kfree_rcu(mpath, rcu);
550}
551
552static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath)
553{
554 rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params);
555 mesh_path_free_rcu(tbl, mpath);
556}
557
558
559
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561
562
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564
565
566
567
568
569void mesh_path_flush_by_nexthop(struct sta_info *sta)
570{
571 struct ieee80211_sub_if_data *sdata = sta->sdata;
572 struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
573 struct mesh_path *mpath;
574 struct rhashtable_iter iter;
575 int ret;
576
577 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
578 if (ret)
579 return;
580
581 rhashtable_walk_start(&iter);
582
583 while ((mpath = rhashtable_walk_next(&iter))) {
584 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
585 continue;
586 if (IS_ERR(mpath))
587 break;
588
589 if (rcu_access_pointer(mpath->next_hop) == sta)
590 __mesh_path_del(tbl, mpath);
591 }
592
593 rhashtable_walk_stop(&iter);
594 rhashtable_walk_exit(&iter);
595}
596
597static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata,
598 const u8 *proxy)
599{
600 struct mesh_table *tbl = sdata->u.mesh.mpp_paths;
601 struct mesh_path *mpath;
602 struct rhashtable_iter iter;
603 int ret;
604
605 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
606 if (ret)
607 return;
608
609 rhashtable_walk_start(&iter);
610
611 while ((mpath = rhashtable_walk_next(&iter))) {
612 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
613 continue;
614 if (IS_ERR(mpath))
615 break;
616
617 if (ether_addr_equal(mpath->mpp, proxy))
618 __mesh_path_del(tbl, mpath);
619 }
620
621 rhashtable_walk_stop(&iter);
622 rhashtable_walk_exit(&iter);
623}
624
625static void table_flush_by_iface(struct mesh_table *tbl)
626{
627 struct mesh_path *mpath;
628 struct rhashtable_iter iter;
629 int ret;
630
631 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
632 if (ret)
633 return;
634
635 rhashtable_walk_start(&iter);
636
637 while ((mpath = rhashtable_walk_next(&iter))) {
638 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
639 continue;
640 if (IS_ERR(mpath))
641 break;
642 __mesh_path_del(tbl, mpath);
643 }
644
645 rhashtable_walk_stop(&iter);
646 rhashtable_walk_exit(&iter);
647}
648
649
650
651
652
653
654
655
656
657void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
658{
659 table_flush_by_iface(sdata->u.mesh.mesh_paths);
660 table_flush_by_iface(sdata->u.mesh.mpp_paths);
661}
662
663
664
665
666
667
668
669
670
671
672static int table_path_del(struct mesh_table *tbl,
673 struct ieee80211_sub_if_data *sdata,
674 const u8 *addr)
675{
676 struct mesh_path *mpath;
677
678 rcu_read_lock();
679 mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params);
680 if (!mpath) {
681 rcu_read_unlock();
682 return -ENXIO;
683 }
684
685 __mesh_path_del(tbl, mpath);
686 rcu_read_unlock();
687 return 0;
688}
689
690
691
692
693
694
695
696
697
698
699int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
700{
701 int err;
702
703
704 mpp_flush_by_proxy(sdata, addr);
705
706 err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr);
707 sdata->u.mesh.mesh_paths_generation++;
708 return err;
709}
710
711
712
713
714
715
716
717
718
719void mesh_path_tx_pending(struct mesh_path *mpath)
720{
721 if (mpath->flags & MESH_PATH_ACTIVE)
722 ieee80211_add_pending_skbs(mpath->sdata->local,
723 &mpath->frame_queue);
724}
725
726
727
728
729
730
731
732
733
734
735
736int mesh_path_send_to_gates(struct mesh_path *mpath)
737{
738 struct ieee80211_sub_if_data *sdata = mpath->sdata;
739 struct mesh_table *tbl;
740 struct mesh_path *from_mpath = mpath;
741 struct mesh_path *gate;
742 bool copy = false;
743
744 tbl = sdata->u.mesh.mesh_paths;
745
746 rcu_read_lock();
747 hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
748 if (gate->flags & MESH_PATH_ACTIVE) {
749 mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst);
750 mesh_path_move_to_queue(gate, from_mpath, copy);
751 from_mpath = gate;
752 copy = true;
753 } else {
754 mpath_dbg(sdata,
755 "Not forwarding to %pM (flags %#x)\n",
756 gate->dst, gate->flags);
757 }
758 }
759
760 hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
761 mpath_dbg(sdata, "Sending to %pM\n", gate->dst);
762 mesh_path_tx_pending(gate);
763 }
764 rcu_read_unlock();
765
766 return (from_mpath == mpath) ? -EHOSTUNREACH : 0;
767}
768
769
770
771
772
773
774
775
776
777void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
778 struct sk_buff *skb)
779{
780 kfree_skb(skb);
781 sdata->u.mesh.mshstats.dropped_frames_no_route++;
782}
783
784
785
786
787
788
789
790
791void mesh_path_flush_pending(struct mesh_path *mpath)
792{
793 struct sk_buff *skb;
794
795 while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL)
796 mesh_path_discard_frame(mpath->sdata, skb);
797}
798
799
800
801
802
803
804
805
806
807void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop)
808{
809 spin_lock_bh(&mpath->state_lock);
810 mesh_path_assign_nexthop(mpath, next_hop);
811 mpath->sn = 0xffff;
812 mpath->metric = 0;
813 mpath->hop_count = 0;
814 mpath->exp_time = 0;
815 mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID;
816 mesh_path_activate(mpath);
817 spin_unlock_bh(&mpath->state_lock);
818 ewma_mesh_fail_avg_init(&next_hop->mesh->fail_avg);
819
820 ewma_mesh_fail_avg_add(&next_hop->mesh->fail_avg, 1);
821 mesh_path_tx_pending(mpath);
822}
823
824int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata)
825{
826 struct mesh_table *tbl_path, *tbl_mpp;
827 int ret;
828
829 tbl_path = mesh_table_alloc();
830 if (!tbl_path)
831 return -ENOMEM;
832
833 tbl_mpp = mesh_table_alloc();
834 if (!tbl_mpp) {
835 ret = -ENOMEM;
836 goto free_path;
837 }
838
839 rhashtable_init(&tbl_path->rhead, &mesh_rht_params);
840 rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params);
841
842 sdata->u.mesh.mesh_paths = tbl_path;
843 sdata->u.mesh.mpp_paths = tbl_mpp;
844
845 return 0;
846
847free_path:
848 mesh_table_free(tbl_path);
849 return ret;
850}
851
852static
853void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata,
854 struct mesh_table *tbl)
855{
856 struct mesh_path *mpath;
857 struct rhashtable_iter iter;
858 int ret;
859
860 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_KERNEL);
861 if (ret)
862 return;
863
864 rhashtable_walk_start(&iter);
865
866 while ((mpath = rhashtable_walk_next(&iter))) {
867 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
868 continue;
869 if (IS_ERR(mpath))
870 break;
871 if ((!(mpath->flags & MESH_PATH_RESOLVING)) &&
872 (!(mpath->flags & MESH_PATH_FIXED)) &&
873 time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
874 __mesh_path_del(tbl, mpath);
875 }
876
877 rhashtable_walk_stop(&iter);
878 rhashtable_walk_exit(&iter);
879}
880
881void mesh_path_expire(struct ieee80211_sub_if_data *sdata)
882{
883 mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths);
884 mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths);
885}
886
887void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata)
888{
889 mesh_table_free(sdata->u.mesh.mesh_paths);
890 mesh_table_free(sdata->u.mesh.mpp_paths);
891}
892