2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
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>
18 #include "ieee80211_i.h"
21 static void mesh_path_free_rcu(struct mesh_table *tbl, struct mesh_path *mpath);
23 static u32 mesh_table_hash(const void *addr, u32 len, u32 seed)
25 /* Use last four bytes of hw addr as hash index */
26 return jhash_1word(__get_unaligned_cpu32((u8 *)addr + 2), seed);
29 static const struct rhashtable_params mesh_rht_params = {
31 .automatic_shrinking = true,
33 .key_offset = offsetof(struct mesh_path, dst),
34 .head_offset = offsetof(struct mesh_path, rhash),
35 .hashfn = mesh_table_hash,
38 static inline bool mpath_expired(struct mesh_path *mpath)
40 return (mpath->flags & MESH_PATH_ACTIVE) &&
41 time_after(jiffies, mpath->exp_time) &&
42 !(mpath->flags & MESH_PATH_FIXED);
45 static void mesh_path_rht_free(void *ptr, void *tblptr)
47 struct mesh_path *mpath = ptr;
48 struct mesh_table *tbl = tblptr;
50 mesh_path_free_rcu(tbl, mpath);
53 static struct mesh_table *mesh_table_alloc(void)
55 struct mesh_table *newtbl;
57 newtbl = kmalloc(sizeof(struct mesh_table), GFP_ATOMIC);
61 INIT_HLIST_HEAD(&newtbl->known_gates);
62 atomic_set(&newtbl->entries, 0);
63 spin_lock_init(&newtbl->gates_lock);
64 rhashtable_init(&newtbl->rhead, &mesh_rht_params);
69 static void mesh_table_free(struct mesh_table *tbl)
71 rhashtable_free_and_destroy(&tbl->rhead,
72 mesh_path_rht_free, tbl);
78 * mesh_path_assign_nexthop - update mesh path next hop
80 * @mpath: mesh path to update
81 * @sta: next hop to assign
83 * Locking: mpath->state_lock must be held when calling this function
85 void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta)
88 struct ieee80211_hdr *hdr;
91 rcu_assign_pointer(mpath->next_hop, sta);
93 spin_lock_irqsave(&mpath->frame_queue.lock, flags);
94 skb_queue_walk(&mpath->frame_queue, skb) {
95 hdr = (struct ieee80211_hdr *) skb->data;
96 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
97 memcpy(hdr->addr2, mpath->sdata->vif.addr, ETH_ALEN);
98 ieee80211_mps_set_frame_flags(sta->sdata, sta, hdr);
101 spin_unlock_irqrestore(&mpath->frame_queue.lock, flags);
104 static void prepare_for_gate(struct sk_buff *skb, char *dst_addr,
105 struct mesh_path *gate_mpath)
107 struct ieee80211_hdr *hdr;
108 struct ieee80211s_hdr *mshdr;
109 int mesh_hdrlen, hdrlen;
112 hdr = (struct ieee80211_hdr *) skb->data;
113 hdrlen = ieee80211_hdrlen(hdr->frame_control);
114 mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
116 if (!(mshdr->flags & MESH_FLAGS_AE)) {
117 /* size of the fixed part of the mesh header */
120 /* make room for the two extended addresses */
121 skb_push(skb, 2 * ETH_ALEN);
122 memmove(skb->data, hdr, hdrlen + mesh_hdrlen);
124 hdr = (struct ieee80211_hdr *) skb->data;
126 /* we preserve the previous mesh header and only add
127 * the new addreses */
128 mshdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
129 mshdr->flags = MESH_FLAGS_AE_A5_A6;
130 memcpy(mshdr->eaddr1, hdr->addr3, ETH_ALEN);
131 memcpy(mshdr->eaddr2, hdr->addr4, ETH_ALEN);
134 /* update next hop */
135 hdr = (struct ieee80211_hdr *) skb->data;
137 next_hop = rcu_dereference(gate_mpath->next_hop)->sta.addr;
138 memcpy(hdr->addr1, next_hop, ETH_ALEN);
140 memcpy(hdr->addr2, gate_mpath->sdata->vif.addr, ETH_ALEN);
141 memcpy(hdr->addr3, dst_addr, ETH_ALEN);
146 * mesh_path_move_to_queue - Move or copy frames from one mpath queue to another
148 * This function is used to transfer or copy frames from an unresolved mpath to
149 * a gate mpath. The function also adds the Address Extension field and
150 * updates the next hop.
152 * If a frame already has an Address Extension field, only the next hop and
153 * destination addresses are updated.
155 * The gate mpath must be an active mpath with a valid mpath->next_hop.
157 * @mpath: An active mpath the frames will be sent to (i.e. the gate)
158 * @from_mpath: The failed mpath
159 * @copy: When true, copy all the frames to the new mpath queue. When false,
162 static void mesh_path_move_to_queue(struct mesh_path *gate_mpath,
163 struct mesh_path *from_mpath,
166 struct sk_buff *skb, *fskb, *tmp;
167 struct sk_buff_head failq;
170 if (WARN_ON(gate_mpath == from_mpath))
172 if (WARN_ON(!gate_mpath->next_hop))
175 __skb_queue_head_init(&failq);
177 spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
178 skb_queue_splice_init(&from_mpath->frame_queue, &failq);
179 spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
181 skb_queue_walk_safe(&failq, fskb, tmp) {
182 if (skb_queue_len(&gate_mpath->frame_queue) >=
183 MESH_FRAME_QUEUE_LEN) {
184 mpath_dbg(gate_mpath->sdata, "mpath queue full!\n");
188 skb = skb_copy(fskb, GFP_ATOMIC);
192 prepare_for_gate(skb, gate_mpath->dst, gate_mpath);
193 skb_queue_tail(&gate_mpath->frame_queue, skb);
198 __skb_unlink(fskb, &failq);
202 mpath_dbg(gate_mpath->sdata, "Mpath queue for gate %pM has %d frames\n",
203 gate_mpath->dst, skb_queue_len(&gate_mpath->frame_queue));
208 spin_lock_irqsave(&from_mpath->frame_queue.lock, flags);
209 skb_queue_splice(&failq, &from_mpath->frame_queue);
210 spin_unlock_irqrestore(&from_mpath->frame_queue.lock, flags);
214 static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst,
215 struct ieee80211_sub_if_data *sdata)
217 struct mesh_path *mpath;
219 mpath = rhashtable_lookup_fast(&tbl->rhead, dst, mesh_rht_params);
221 if (mpath && mpath_expired(mpath)) {
222 spin_lock_bh(&mpath->state_lock);
223 mpath->flags &= ~MESH_PATH_ACTIVE;
224 spin_unlock_bh(&mpath->state_lock);
230 * mesh_path_lookup - look up a path in the mesh path table
231 * @sdata: local subif
232 * @dst: hardware address (ETH_ALEN length) of destination
234 * Returns: pointer to the mesh path structure, or NULL if not found
236 * Locking: must be called within a read rcu section.
239 mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
241 return mpath_lookup(sdata->u.mesh.mesh_paths, dst, sdata);
245 mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)
247 return mpath_lookup(sdata->u.mesh.mpp_paths, dst, sdata);
250 static struct mesh_path *
251 __mesh_path_lookup_by_idx(struct mesh_table *tbl, int idx)
254 struct mesh_path *mpath = NULL;
255 struct rhashtable_iter iter;
257 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
261 ret = rhashtable_walk_start(&iter);
262 if (ret && ret != -EAGAIN)
265 while ((mpath = rhashtable_walk_next(&iter))) {
266 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
274 rhashtable_walk_stop(&iter);
275 rhashtable_walk_exit(&iter);
277 if (IS_ERR(mpath) || !mpath)
280 if (mpath_expired(mpath)) {
281 spin_lock_bh(&mpath->state_lock);
282 mpath->flags &= ~MESH_PATH_ACTIVE;
283 spin_unlock_bh(&mpath->state_lock);
289 * mesh_path_lookup_by_idx - look up a path in the mesh path table by its index
291 * @sdata: local subif, or NULL for all entries
293 * Returns: pointer to the mesh path structure, or NULL if not found.
295 * Locking: must be called within a read rcu section.
298 mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
300 return __mesh_path_lookup_by_idx(sdata->u.mesh.mesh_paths, idx);
304 * mpp_path_lookup_by_idx - look up a path in the proxy path table by its index
306 * @sdata: local subif, or NULL for all entries
308 * Returns: pointer to the proxy path structure, or NULL if not found.
310 * Locking: must be called within a read rcu section.
313 mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)
315 return __mesh_path_lookup_by_idx(sdata->u.mesh.mpp_paths, idx);
319 * mesh_path_add_gate - add the given mpath to a mesh gate to our path table
320 * @mpath: gate path to add to table
322 int mesh_path_add_gate(struct mesh_path *mpath)
324 struct mesh_table *tbl;
328 tbl = mpath->sdata->u.mesh.mesh_paths;
330 spin_lock_bh(&mpath->state_lock);
331 if (mpath->is_gate) {
333 spin_unlock_bh(&mpath->state_lock);
336 mpath->is_gate = true;
337 mpath->sdata->u.mesh.num_gates++;
339 spin_lock(&tbl->gates_lock);
340 hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
341 spin_unlock(&tbl->gates_lock);
343 spin_unlock_bh(&mpath->state_lock);
345 mpath_dbg(mpath->sdata,
346 "Mesh path: Recorded new gate: %pM. %d known gates\n",
347 mpath->dst, mpath->sdata->u.mesh.num_gates);
355 * mesh_gate_del - remove a mesh gate from the list of known gates
356 * @tbl: table which holds our list of known gates
359 static void mesh_gate_del(struct mesh_table *tbl, struct mesh_path *mpath)
361 lockdep_assert_held(&mpath->state_lock);
365 mpath->is_gate = false;
366 spin_lock_bh(&tbl->gates_lock);
367 hlist_del_rcu(&mpath->gate_list);
368 mpath->sdata->u.mesh.num_gates--;
369 spin_unlock_bh(&tbl->gates_lock);
371 mpath_dbg(mpath->sdata,
372 "Mesh path: Deleted gate: %pM. %d known gates\n",
373 mpath->dst, mpath->sdata->u.mesh.num_gates);
377 * mesh_gate_num - number of gates known to this interface
380 int mesh_gate_num(struct ieee80211_sub_if_data *sdata)
382 return sdata->u.mesh.num_gates;
386 struct mesh_path *mesh_path_new(struct ieee80211_sub_if_data *sdata,
387 const u8 *dst, gfp_t gfp_flags)
389 struct mesh_path *new_mpath;
391 new_mpath = kzalloc(sizeof(struct mesh_path), gfp_flags);
395 memcpy(new_mpath->dst, dst, ETH_ALEN);
396 eth_broadcast_addr(new_mpath->rann_snd_addr);
397 new_mpath->is_root = false;
398 new_mpath->sdata = sdata;
399 new_mpath->flags = 0;
400 skb_queue_head_init(&new_mpath->frame_queue);
401 new_mpath->timer.data = (unsigned long) new_mpath;
402 new_mpath->timer.function = mesh_path_timer;
403 new_mpath->exp_time = jiffies;
404 spin_lock_init(&new_mpath->state_lock);
405 init_timer(&new_mpath->timer);
411 * mesh_path_add - allocate and add a new path to the mesh path table
412 * @dst: destination address of the path (ETH_ALEN length)
413 * @sdata: local subif
415 * Returns: 0 on success
417 * State: the initial state of the new path is set to 0
419 struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata,
422 struct mesh_table *tbl;
423 struct mesh_path *mpath, *new_mpath;
426 if (ether_addr_equal(dst, sdata->vif.addr))
427 /* never add ourselves as neighbours */
428 return ERR_PTR(-ENOTSUPP);
430 if (is_multicast_ether_addr(dst))
431 return ERR_PTR(-ENOTSUPP);
433 if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0)
434 return ERR_PTR(-ENOSPC);
436 new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
438 return ERR_PTR(-ENOMEM);
440 tbl = sdata->u.mesh.mesh_paths;
442 ret = rhashtable_lookup_insert_fast(&tbl->rhead,
447 mpath = rhashtable_lookup_fast(&tbl->rhead,
451 } while (unlikely(ret == -EEXIST && !mpath));
462 sdata->u.mesh.mesh_paths_generation++;
466 int mpp_path_add(struct ieee80211_sub_if_data *sdata,
467 const u8 *dst, const u8 *mpp)
469 struct mesh_table *tbl;
470 struct mesh_path *new_mpath;
473 if (ether_addr_equal(dst, sdata->vif.addr))
474 /* never add ourselves as neighbours */
477 if (is_multicast_ether_addr(dst))
480 new_mpath = mesh_path_new(sdata, dst, GFP_ATOMIC);
485 memcpy(new_mpath->mpp, mpp, ETH_ALEN);
486 tbl = sdata->u.mesh.mpp_paths;
487 ret = rhashtable_lookup_insert_fast(&tbl->rhead,
494 sdata->u.mesh.mpp_paths_generation++;
500 * mesh_plink_broken - deactivates paths and sends perr when a link breaks
502 * @sta: broken peer link
504 * This function must be called from the rate control algorithm if enough
505 * delivery errors suggest that a peer link is no longer usable.
507 void mesh_plink_broken(struct sta_info *sta)
509 struct ieee80211_sub_if_data *sdata = sta->sdata;
510 struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
511 static const u8 bcast[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
512 struct mesh_path *mpath;
513 struct rhashtable_iter iter;
516 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
520 ret = rhashtable_walk_start(&iter);
521 if (ret && ret != -EAGAIN)
524 while ((mpath = rhashtable_walk_next(&iter))) {
525 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
529 if (rcu_access_pointer(mpath->next_hop) == sta &&
530 mpath->flags & MESH_PATH_ACTIVE &&
531 !(mpath->flags & MESH_PATH_FIXED)) {
532 spin_lock_bh(&mpath->state_lock);
533 mpath->flags &= ~MESH_PATH_ACTIVE;
535 spin_unlock_bh(&mpath->state_lock);
536 mesh_path_error_tx(sdata,
537 sdata->u.mesh.mshcfg.element_ttl,
538 mpath->dst, mpath->sn,
539 WLAN_REASON_MESH_PATH_DEST_UNREACHABLE, bcast);
543 rhashtable_walk_stop(&iter);
544 rhashtable_walk_exit(&iter);
547 static void mesh_path_free_rcu(struct mesh_table *tbl,
548 struct mesh_path *mpath)
550 struct ieee80211_sub_if_data *sdata = mpath->sdata;
552 spin_lock_bh(&mpath->state_lock);
553 mpath->flags |= MESH_PATH_RESOLVING | MESH_PATH_DELETED;
554 mesh_gate_del(tbl, mpath);
555 spin_unlock_bh(&mpath->state_lock);
556 del_timer_sync(&mpath->timer);
557 atomic_dec(&sdata->u.mesh.mpaths);
558 atomic_dec(&tbl->entries);
559 mesh_path_flush_pending(mpath);
560 kfree_rcu(mpath, rcu);
563 static void __mesh_path_del(struct mesh_table *tbl, struct mesh_path *mpath)
565 rhashtable_remove_fast(&tbl->rhead, &mpath->rhash, mesh_rht_params);
566 mesh_path_free_rcu(tbl, mpath);
570 * mesh_path_flush_by_nexthop - Deletes mesh paths if their next hop matches
572 * @sta: mesh peer to match
574 * RCU notes: this function is called when a mesh plink transitions from
575 * PLINK_ESTAB to any other state, since PLINK_ESTAB state is the only one that
576 * allows path creation. This will happen before the sta can be freed (because
577 * sta_info_destroy() calls this) so any reader in a rcu read block will be
578 * protected against the plink disappearing.
580 void mesh_path_flush_by_nexthop(struct sta_info *sta)
582 struct ieee80211_sub_if_data *sdata = sta->sdata;
583 struct mesh_table *tbl = sdata->u.mesh.mesh_paths;
584 struct mesh_path *mpath;
585 struct rhashtable_iter iter;
588 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
592 ret = rhashtable_walk_start(&iter);
593 if (ret && ret != -EAGAIN)
596 while ((mpath = rhashtable_walk_next(&iter))) {
597 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
602 if (rcu_access_pointer(mpath->next_hop) == sta)
603 __mesh_path_del(tbl, mpath);
606 rhashtable_walk_stop(&iter);
607 rhashtable_walk_exit(&iter);
610 static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata,
613 struct mesh_table *tbl = sdata->u.mesh.mpp_paths;
614 struct mesh_path *mpath;
615 struct rhashtable_iter iter;
618 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
622 ret = rhashtable_walk_start(&iter);
623 if (ret && ret != -EAGAIN)
626 while ((mpath = rhashtable_walk_next(&iter))) {
627 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
632 if (ether_addr_equal(mpath->mpp, proxy))
633 __mesh_path_del(tbl, mpath);
636 rhashtable_walk_stop(&iter);
637 rhashtable_walk_exit(&iter);
640 static void table_flush_by_iface(struct mesh_table *tbl)
642 struct mesh_path *mpath;
643 struct rhashtable_iter iter;
646 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_ATOMIC);
650 ret = rhashtable_walk_start(&iter);
651 if (ret && ret != -EAGAIN)
654 while ((mpath = rhashtable_walk_next(&iter))) {
655 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
659 __mesh_path_del(tbl, mpath);
662 rhashtable_walk_stop(&iter);
663 rhashtable_walk_exit(&iter);
667 * mesh_path_flush_by_iface - Deletes all mesh paths associated with a given iface
669 * This function deletes both mesh paths as well as mesh portal paths.
671 * @sdata: interface data to match
674 void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata)
676 table_flush_by_iface(sdata->u.mesh.mesh_paths);
677 table_flush_by_iface(sdata->u.mesh.mpp_paths);
681 * table_path_del - delete a path from the mesh or mpp table
683 * @tbl: mesh or mpp path table
684 * @sdata: local subif
685 * @addr: dst address (ETH_ALEN length)
687 * Returns: 0 if successful
689 static int table_path_del(struct mesh_table *tbl,
690 struct ieee80211_sub_if_data *sdata,
693 struct mesh_path *mpath;
696 mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params);
702 __mesh_path_del(tbl, mpath);
709 * mesh_path_del - delete a mesh path from the table
711 * @addr: dst address (ETH_ALEN length)
712 * @sdata: local subif
714 * Returns: 0 if successful
716 int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr)
720 /* flush relevant mpp entries first */
721 mpp_flush_by_proxy(sdata, addr);
723 err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr);
724 sdata->u.mesh.mesh_paths_generation++;
729 * mesh_path_tx_pending - sends pending frames in a mesh path queue
731 * @mpath: mesh path to activate
733 * Locking: the state_lock of the mpath structure must NOT be held when calling
736 void mesh_path_tx_pending(struct mesh_path *mpath)
738 if (mpath->flags & MESH_PATH_ACTIVE)
739 ieee80211_add_pending_skbs(mpath->sdata->local,
740 &mpath->frame_queue);
744 * mesh_path_send_to_gates - sends pending frames to all known mesh gates
746 * @mpath: mesh path whose queue will be emptied
748 * If there is only one gate, the frames are transferred from the failed mpath
749 * queue to that gate's queue. If there are more than one gates, the frames
750 * are copied from each gate to the next. After frames are copied, the
751 * mpath queues are emptied onto the transmission queue.
753 int mesh_path_send_to_gates(struct mesh_path *mpath)
755 struct ieee80211_sub_if_data *sdata = mpath->sdata;
756 struct mesh_table *tbl;
757 struct mesh_path *from_mpath = mpath;
758 struct mesh_path *gate;
761 tbl = sdata->u.mesh.mesh_paths;
764 hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
765 if (gate->flags & MESH_PATH_ACTIVE) {
766 mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst);
767 mesh_path_move_to_queue(gate, from_mpath, copy);
772 "Not forwarding to %pM (flags %#x)\n",
773 gate->dst, gate->flags);
777 hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
778 mpath_dbg(sdata, "Sending to %pM\n", gate->dst);
779 mesh_path_tx_pending(gate);
783 return (from_mpath == mpath) ? -EHOSTUNREACH : 0;
787 * mesh_path_discard_frame - discard a frame whose path could not be resolved
789 * @skb: frame to discard
790 * @sdata: network subif the frame was to be sent through
792 * Locking: the function must me called within a rcu_read_lock region
794 void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
798 sdata->u.mesh.mshstats.dropped_frames_no_route++;
802 * mesh_path_flush_pending - free the pending queue of a mesh path
804 * @mpath: mesh path whose queue has to be freed
806 * Locking: the function must me called within a rcu_read_lock region
808 void mesh_path_flush_pending(struct mesh_path *mpath)
812 while ((skb = skb_dequeue(&mpath->frame_queue)) != NULL)
813 mesh_path_discard_frame(mpath->sdata, skb);
817 * mesh_path_fix_nexthop - force a specific next hop for a mesh path
819 * @mpath: the mesh path to modify
820 * @next_hop: the next hop to force
822 * Locking: this function must be called holding mpath->state_lock
824 void mesh_path_fix_nexthop(struct mesh_path *mpath, struct sta_info *next_hop)
826 spin_lock_bh(&mpath->state_lock);
827 mesh_path_assign_nexthop(mpath, next_hop);
830 mpath->hop_count = 0;
832 mpath->flags = MESH_PATH_FIXED | MESH_PATH_SN_VALID;
833 mesh_path_activate(mpath);
834 spin_unlock_bh(&mpath->state_lock);
835 mesh_path_tx_pending(mpath);
838 int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata)
840 struct mesh_table *tbl_path, *tbl_mpp;
843 tbl_path = mesh_table_alloc();
847 tbl_mpp = mesh_table_alloc();
853 sdata->u.mesh.mesh_paths = tbl_path;
854 sdata->u.mesh.mpp_paths = tbl_mpp;
859 mesh_table_free(tbl_path);
864 void mesh_path_tbl_expire(struct ieee80211_sub_if_data *sdata,
865 struct mesh_table *tbl)
867 struct mesh_path *mpath;
868 struct rhashtable_iter iter;
871 ret = rhashtable_walk_init(&tbl->rhead, &iter, GFP_KERNEL);
875 ret = rhashtable_walk_start(&iter);
876 if (ret && ret != -EAGAIN)
879 while ((mpath = rhashtable_walk_next(&iter))) {
880 if (IS_ERR(mpath) && PTR_ERR(mpath) == -EAGAIN)
884 if ((!(mpath->flags & MESH_PATH_RESOLVING)) &&
885 (!(mpath->flags & MESH_PATH_FIXED)) &&
886 time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))
887 __mesh_path_del(tbl, mpath);
890 rhashtable_walk_stop(&iter);
891 rhashtable_walk_exit(&iter);
894 void mesh_path_expire(struct ieee80211_sub_if_data *sdata)
896 mesh_path_tbl_expire(sdata, sdata->u.mesh.mesh_paths);
897 mesh_path_tbl_expire(sdata, sdata->u.mesh.mpp_paths);
900 void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata)
902 mesh_table_free(sdata->u.mesh.mesh_paths);
903 mesh_table_free(sdata->u.mesh.mpp_paths);