2 * Copyright (c) 2008 open80211s Ltd.
3 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
4 * Javier Cardona <javier@cozybit.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <asm/unaligned.h>
12 #include "ieee80211_i.h"
15 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
16 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
18 #define PP_OFFSET 1 /* Path Selection Protocol */
19 #define PM_OFFSET 5 /* Path Selection Metric */
20 #define CC_OFFSET 9 /* Congestion Control Mode */
21 #define CAPAB_OFFSET 17
22 #define ACCEPT_PLINKS 0x80
24 #define TMR_RUNNING_HK 0
25 #define TMR_RUNNING_MP 1
28 static struct kmem_cache *rm_cache;
30 void ieee80211s_init(void)
34 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
38 void ieee80211s_stop(void)
40 mesh_pathtbl_unregister();
41 kmem_cache_destroy(rm_cache);
44 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
46 struct ieee80211_sub_if_data *sdata = (void *) data;
47 struct ieee80211_local *local = sdata->local;
48 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
50 ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
52 if (local->quiescing) {
53 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
57 ieee80211_queue_work(&local->hw, &ifmsh->work);
61 * mesh_matches_local - check if the config of a mesh point matches ours
63 * @ie: information elements of a management frame from the mesh peer
64 * @sdata: local mesh subif
66 * This function checks if the mesh configuration of a mesh point matches the
67 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
71 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
74 * As support for each feature is added, check for matching
75 * - On mesh config capabilities
76 * - Power Save Support En
77 * - Sync support enabled
78 * - Sync support active
79 * - Sync support required from peer
81 * - Power management control on fc
83 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
84 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
85 memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
86 memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
87 memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
94 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
96 * @ie: information elements of a management frame from the mesh peer
98 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
100 return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
104 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
106 * @sdata: mesh interface in which mesh beacons are going to be updated
108 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
112 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
113 * the mesh interface might be able to establish plinks with peers that
114 * are already on the table but are not on PLINK_ESTAB state. However,
115 * in general the mesh interface is not accepting peer link requests
116 * from new peers, and that must be reflected in the beacon
118 free_plinks = mesh_plink_availables(sdata);
120 if (free_plinks != sdata->u.mesh.accepting_plinks)
121 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
124 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
126 u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
128 memcpy(sta->mesh_pp_id, def_id, 4);
129 memcpy(sta->mesh_pm_id, def_id, 4);
130 memcpy(sta->mesh_cc_id, def_id, 4);
133 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
137 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
138 if (!sdata->u.mesh.rmc)
140 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
141 for (i = 0; i < RMC_BUCKETS; i++)
142 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
146 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
148 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
149 struct rmc_entry *p, *n;
152 if (!sdata->u.mesh.rmc)
155 for (i = 0; i < RMC_BUCKETS; i++)
156 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
158 kmem_cache_free(rm_cache, p);
162 sdata->u.mesh.rmc = NULL;
166 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
168 * @sa: source address
169 * @mesh_hdr: mesh_header
171 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
173 * Checks using the source address and the mesh sequence number if we have
174 * received this frame lately. If the frame is not in the cache, it is added to
177 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
178 struct ieee80211_sub_if_data *sdata)
180 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
184 struct rmc_entry *p, *n;
186 /* Don't care about endianness since only match matters */
187 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
188 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
189 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
191 if (time_after(jiffies, p->exp_time) ||
192 (entries == RMC_QUEUE_MAX_LEN)) {
194 kmem_cache_free(rm_cache, p);
196 } else if ((seqnum == p->seqnum)
197 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
201 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
203 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
207 p->exp_time = jiffies + RMC_TIMEOUT;
208 memcpy(p->sa, sa, ETH_ALEN);
209 list_add(&p->list, &rmc->bucket[idx].list);
213 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
215 struct ieee80211_local *local = sdata->local;
216 struct ieee80211_supported_band *sband;
220 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
221 len = sband->n_bitrates;
224 pos = skb_put(skb, len + 2);
225 *pos++ = WLAN_EID_SUPP_RATES;
227 for (i = 0; i < len; i++) {
228 rate = sband->bitrates[i].bitrate;
229 *pos++ = (u8) (rate / 5);
232 if (sband->n_bitrates > len) {
233 pos = skb_put(skb, sband->n_bitrates - len + 2);
234 *pos++ = WLAN_EID_EXT_SUPP_RATES;
235 *pos++ = sband->n_bitrates - len;
236 for (i = len; i < sband->n_bitrates; i++) {
237 rate = sband->bitrates[i].bitrate;
238 *pos++ = (u8) (rate / 5);
242 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
243 *pos++ = WLAN_EID_MESH_ID;
244 *pos++ = sdata->u.mesh.mesh_id_len;
245 if (sdata->u.mesh.mesh_id_len)
246 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
248 pos = skb_put(skb, 21);
249 *pos++ = WLAN_EID_MESH_CONFIG;
250 *pos++ = IEEE80211_MESH_CONFIG_LEN;
254 /* Active path selection protocol ID */
255 memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
258 /* Active path selection metric ID */
259 memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
262 /* Congestion control mode identifier */
263 memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
266 /* Channel precedence:
267 * Not running simple channel unification protocol
269 memset(pos, 0x00, 4);
272 /* Mesh capability */
273 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
274 *pos++ = sdata->u.mesh.accepting_plinks ? ACCEPT_PLINKS : 0x00;
280 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
282 /* Use last four bytes of hw addr and interface index as hash index */
283 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
287 struct mesh_table *mesh_table_alloc(int size_order)
290 struct mesh_table *newtbl;
292 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
296 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
297 (1 << size_order), GFP_KERNEL);
299 if (!newtbl->hash_buckets) {
304 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
305 (1 << size_order), GFP_KERNEL);
306 if (!newtbl->hashwlock) {
307 kfree(newtbl->hash_buckets);
312 newtbl->size_order = size_order;
313 newtbl->hash_mask = (1 << size_order) - 1;
314 atomic_set(&newtbl->entries, 0);
315 get_random_bytes(&newtbl->hash_rnd,
316 sizeof(newtbl->hash_rnd));
317 for (i = 0; i <= newtbl->hash_mask; i++)
318 spin_lock_init(&newtbl->hashwlock[i]);
324 static void ieee80211_mesh_path_timer(unsigned long data)
326 struct ieee80211_sub_if_data *sdata =
327 (struct ieee80211_sub_if_data *) data;
328 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
329 struct ieee80211_local *local = sdata->local;
331 if (local->quiescing) {
332 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
336 ieee80211_queue_work(&local->hw, &ifmsh->work);
340 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
341 * @hdr: 802.11 frame header
342 * @fc: frame control field
343 * @meshda: destination address in the mesh
344 * @meshsa: source address address in the mesh. Same as TA, as frame is
345 * locally originated.
347 * Return the length of the 802.11 (does not include a mesh control header)
349 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
350 *meshda, char *meshsa) {
351 if (is_multicast_ether_addr(meshda)) {
352 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
354 memcpy(hdr->addr1, meshda, ETH_ALEN);
355 memcpy(hdr->addr2, meshsa, ETH_ALEN);
356 memcpy(hdr->addr3, meshsa, ETH_ALEN);
359 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
360 IEEE80211_FCTL_TODS);
362 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
363 memcpy(hdr->addr2, meshsa, ETH_ALEN);
364 memcpy(hdr->addr3, meshda, ETH_ALEN);
365 memcpy(hdr->addr4, meshsa, ETH_ALEN);
371 * ieee80211_new_mesh_header - create a new mesh header
372 * @meshhdr: uninitialized mesh header
373 * @sdata: mesh interface to be used
374 * @addr4: addr4 of the mesh frame (1st in ae header)
376 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
377 * may be NULL unless addr6 is present
378 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
379 * may be NULL unless addr5 is present
381 * Return the header length.
383 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
384 struct ieee80211_sub_if_data *sdata, char *addr4,
385 char *addr5, char *addr6)
388 memset(meshhdr, 0, sizeof(meshhdr));
389 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
390 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
391 sdata->u.mesh.mesh_seqnum++;
393 meshhdr->flags |= MESH_FLAGS_AE_A4;
395 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
397 if (addr5 && addr6) {
398 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
399 aelen += 2 * ETH_ALEN;
401 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
402 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
404 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
405 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
411 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
412 struct ieee80211_if_mesh *ifmsh)
416 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
417 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
421 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
422 mesh_path_expire(sdata);
424 free_plinks = mesh_plink_availables(sdata);
425 if (free_plinks != sdata->u.mesh.accepting_plinks)
426 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
428 mod_timer(&ifmsh->housekeeping_timer,
429 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
433 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
435 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
437 /* might restart the timer but that doesn't matter */
438 cancel_work_sync(&ifmsh->work);
440 /* use atomic bitops in case both timers fire at the same time */
442 if (del_timer_sync(&ifmsh->housekeeping_timer))
443 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
444 if (del_timer_sync(&ifmsh->mesh_path_timer))
445 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
448 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
450 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
452 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
453 add_timer(&ifmsh->housekeeping_timer);
454 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
455 add_timer(&ifmsh->mesh_path_timer);
459 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
461 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
462 struct ieee80211_local *local = sdata->local;
464 ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
465 ieee80211_queue_work(&local->hw, &ifmsh->work);
466 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
467 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
468 BSS_CHANGED_BEACON_ENABLED |
469 BSS_CHANGED_BEACON_INT);
472 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
474 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
476 * If the timer fired while we waited for it, it will have
477 * requeued the work. Now the work will be running again
478 * but will not rearm the timer again because it checks
479 * whether the interface is running, which, at this point,
482 cancel_work_sync(&sdata->u.mesh.work);
485 * When we get here, the interface is marked down.
486 * Call synchronize_rcu() to wait for the RX path
487 * should it be using the interface and enqueuing
488 * frames at this very time on another CPU.
490 rcu_barrier(); /* Wait for RX path and call_rcu()'s */
491 skb_queue_purge(&sdata->u.mesh.skb_queue);
494 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
496 struct ieee80211_mgmt *mgmt,
498 struct ieee80211_rx_status *rx_status)
500 struct ieee80211_local *local = sdata->local;
501 struct ieee802_11_elems elems;
502 struct ieee80211_channel *channel;
506 enum ieee80211_band band = rx_status->band;
508 /* ignore ProbeResp to foreign address */
509 if (stype == IEEE80211_STYPE_PROBE_RESP &&
510 compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
513 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
517 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
520 if (elems.ds_params && elems.ds_params_len == 1)
521 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
523 freq = rx_status->freq;
525 channel = ieee80211_get_channel(local->hw.wiphy, freq);
527 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
530 if (elems.mesh_id && elems.mesh_config &&
531 mesh_matches_local(&elems, sdata)) {
532 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
534 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
535 mesh_peer_accepts_plinks(&elems));
539 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
540 struct ieee80211_mgmt *mgmt,
542 struct ieee80211_rx_status *rx_status)
544 switch (mgmt->u.action.category) {
546 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
548 case MESH_PATH_SEL_CATEGORY:
549 mesh_rx_path_sel_frame(sdata, mgmt, len);
554 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
557 struct ieee80211_rx_status *rx_status;
558 struct ieee80211_if_mesh *ifmsh;
559 struct ieee80211_mgmt *mgmt;
562 ifmsh = &sdata->u.mesh;
564 rx_status = IEEE80211_SKB_RXCB(skb);
565 mgmt = (struct ieee80211_mgmt *) skb->data;
566 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
569 case IEEE80211_STYPE_PROBE_RESP:
570 case IEEE80211_STYPE_BEACON:
571 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
574 case IEEE80211_STYPE_ACTION:
575 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
582 static void ieee80211_mesh_work(struct work_struct *work)
584 struct ieee80211_sub_if_data *sdata =
585 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
586 struct ieee80211_local *local = sdata->local;
587 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
590 if (!netif_running(sdata->dev))
596 while ((skb = skb_dequeue(&ifmsh->skb_queue)))
597 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
599 if (ifmsh->preq_queue_len &&
601 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
602 mesh_path_start_discovery(sdata);
604 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
605 mesh_mpath_table_grow();
607 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
608 mesh_mpp_table_grow();
610 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
611 ieee80211_mesh_housekeeping(sdata, ifmsh);
614 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
616 struct ieee80211_sub_if_data *sdata;
619 list_for_each_entry_rcu(sdata, &local->interfaces, list)
620 if (ieee80211_vif_is_mesh(&sdata->vif))
621 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
625 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
627 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
629 INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
630 setup_timer(&ifmsh->housekeeping_timer,
631 ieee80211_mesh_housekeeping_timer,
632 (unsigned long) sdata);
633 skb_queue_head_init(&sdata->u.mesh.skb_queue);
635 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
636 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
637 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
638 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
639 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
640 ifmsh->mshcfg.auto_open_plinks = true;
641 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
642 MESH_MAX_ESTAB_PLINKS;
643 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
645 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
647 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
648 MESH_DIAM_TRAVERSAL_TIME;
649 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
650 MESH_MAX_PREQ_RETRIES;
651 ifmsh->mshcfg.path_refresh_time =
652 MESH_PATH_REFRESH_TIME;
653 ifmsh->mshcfg.min_discovery_timeout =
654 MESH_MIN_DISCOVERY_TIMEOUT;
655 ifmsh->accepting_plinks = true;
658 atomic_set(&ifmsh->mpaths, 0);
659 mesh_rmc_init(sdata);
660 ifmsh->last_preq = jiffies;
661 /* Allocate all mesh structures when creating the first mesh interface. */
664 mesh_ids_set_default(ifmsh);
665 setup_timer(&ifmsh->mesh_path_timer,
666 ieee80211_mesh_path_timer,
667 (unsigned long) sdata);
668 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
669 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
673 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
675 struct ieee80211_local *local = sdata->local;
676 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
677 struct ieee80211_mgmt *mgmt;
681 return RX_DROP_MONITOR;
683 mgmt = (struct ieee80211_mgmt *) skb->data;
684 fc = le16_to_cpu(mgmt->frame_control);
686 switch (fc & IEEE80211_FCTL_STYPE) {
687 case IEEE80211_STYPE_ACTION:
688 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
689 return RX_DROP_MONITOR;
691 case IEEE80211_STYPE_PROBE_RESP:
692 case IEEE80211_STYPE_BEACON:
693 skb_queue_tail(&ifmsh->skb_queue, skb);
694 ieee80211_queue_work(&local->hw, &ifmsh->work);