2 * Copyright (c) 2008, 2009 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 <linux/slab.h>
12 #include <asm/unaligned.h>
13 #include "ieee80211_i.h"
15 #include "driver-ops.h"
17 static int mesh_allocated;
18 static struct kmem_cache *rm_cache;
20 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
22 return (mgmt->u.action.u.mesh_action.action_code ==
23 WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
26 void ieee80211s_init(void)
30 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
34 void ieee80211s_stop(void)
38 mesh_pathtbl_unregister();
39 kmem_cache_destroy(rm_cache);
42 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
44 struct ieee80211_sub_if_data *sdata = (void *) data;
45 struct ieee80211_local *local = sdata->local;
46 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
48 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
50 ieee80211_queue_work(&local->hw, &sdata->work);
54 * mesh_matches_local - check if the config of a mesh point matches ours
56 * @sdata: local mesh subif
57 * @ie: information elements of a management frame from the mesh peer
59 * This function checks if the mesh configuration of a mesh point matches the
60 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
62 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
63 struct ieee802_11_elems *ie)
65 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
67 struct cfg80211_chan_def sta_chan_def;
70 * As support for each feature is added, check for matching
71 * - On mesh config capabilities
72 * - Power Save Support En
73 * - Sync support enabled
74 * - Sync support active
75 * - Sync support required from peer
77 * - Power management control on fc
79 if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
80 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
81 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
82 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
83 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
84 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
85 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
88 ieee80211_sta_get_rates(sdata, ie, ieee80211_get_sdata_band(sdata),
91 if (sdata->vif.bss_conf.basic_rates != basic_rates)
94 ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
95 ie->ht_operation, &sta_chan_def);
97 if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
105 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
107 * @ie: information elements of a management frame from the mesh peer
109 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
111 return (ie->mesh_config->meshconf_cap &
112 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
116 * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
118 * @sdata: mesh interface in which mesh beacons are going to be updated
120 * Returns: beacon changed flag if the beacon content changed.
122 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
127 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
128 * the mesh interface might be able to establish plinks with peers that
129 * are already on the table but are not on PLINK_ESTAB state. However,
130 * in general the mesh interface is not accepting peer link requests
131 * from new peers, and that must be reflected in the beacon
133 free_plinks = mesh_plink_availables(sdata);
135 if (free_plinks != sdata->u.mesh.accepting_plinks) {
136 sdata->u.mesh.accepting_plinks = free_plinks;
137 changed = BSS_CHANGED_BEACON;
144 * mesh_sta_cleanup - clean up any mesh sta state
146 * @sta: mesh sta to clean up.
148 void mesh_sta_cleanup(struct sta_info *sta)
150 struct ieee80211_sub_if_data *sdata = sta->sdata;
154 * maybe userspace handles peer allocation and peering, but in either
155 * case the beacon is still generated by the kernel and we might need
158 changed = mesh_accept_plinks_update(sdata);
159 if (!sdata->u.mesh.user_mpm) {
160 changed |= mesh_plink_deactivate(sta);
161 del_timer_sync(&sta->plink_timer);
165 ieee80211_mbss_info_change_notify(sdata, changed);
168 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
172 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
173 if (!sdata->u.mesh.rmc)
175 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
176 for (i = 0; i < RMC_BUCKETS; i++)
177 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
181 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
183 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
184 struct rmc_entry *p, *n;
187 if (!sdata->u.mesh.rmc)
190 for (i = 0; i < RMC_BUCKETS; i++) {
191 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
193 kmem_cache_free(rm_cache, p);
198 sdata->u.mesh.rmc = NULL;
202 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
205 * @sa: source address
206 * @mesh_hdr: mesh_header
208 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
210 * Checks using the source address and the mesh sequence number if we have
211 * received this frame lately. If the frame is not in the cache, it is added to
214 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
215 const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
217 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
221 struct rmc_entry *p, *n;
223 /* Don't care about endianness since only match matters */
224 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
225 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
226 list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
228 if (time_after(jiffies, p->exp_time) ||
229 entries == RMC_QUEUE_MAX_LEN) {
231 kmem_cache_free(rm_cache, p);
233 } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
237 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
242 p->exp_time = jiffies + RMC_TIMEOUT;
243 memcpy(p->sa, sa, ETH_ALEN);
244 list_add(&p->list, &rmc->bucket[idx]);
248 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
253 u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
255 if (skb_tailroom(skb) < 2 + meshconf_len)
258 pos = skb_put(skb, 2 + meshconf_len);
259 *pos++ = WLAN_EID_MESH_CONFIG;
260 *pos++ = meshconf_len;
262 /* Active path selection protocol ID */
263 *pos++ = ifmsh->mesh_pp_id;
264 /* Active path selection metric ID */
265 *pos++ = ifmsh->mesh_pm_id;
266 /* Congestion control mode identifier */
267 *pos++ = ifmsh->mesh_cc_id;
268 /* Synchronization protocol identifier */
269 *pos++ = ifmsh->mesh_sp_id;
270 /* Authentication Protocol identifier */
271 *pos++ = ifmsh->mesh_auth_id;
272 /* Mesh Formation Info - number of neighbors */
273 neighbors = atomic_read(&ifmsh->estab_plinks);
274 neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
275 *pos++ = neighbors << 1;
276 /* Mesh capability */
278 *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
279 IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
280 *pos |= ifmsh->accepting_plinks ?
281 IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
282 /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
283 *pos |= ifmsh->ps_peers_deep_sleep ?
284 IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
285 *pos++ |= ifmsh->adjusting_tbtt ?
286 IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
292 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
294 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
297 if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
300 pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
301 *pos++ = WLAN_EID_MESH_ID;
302 *pos++ = ifmsh->mesh_id_len;
303 if (ifmsh->mesh_id_len)
304 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
309 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
312 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
315 /* see IEEE802.11-2012 13.14.6 */
316 if (ifmsh->ps_peers_light_sleep == 0 &&
317 ifmsh->ps_peers_deep_sleep == 0 &&
318 ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
321 if (skb_tailroom(skb) < 4)
324 pos = skb_put(skb, 2 + 2);
325 *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
327 put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
332 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
335 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
339 if (!ifmsh->ie || !ifmsh->ie_len)
342 /* fast-forward to vendor IEs */
343 offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
346 len = ifmsh->ie_len - offset;
347 data = ifmsh->ie + offset;
348 if (skb_tailroom(skb) < len)
350 memcpy(skb_put(skb, len), data, len);
356 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
358 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
362 if (!ifmsh->ie || !ifmsh->ie_len)
367 while (data < ifmsh->ie + ifmsh->ie_len) {
368 if (*data == WLAN_EID_RSN) {
376 if (skb_tailroom(skb) < len)
378 memcpy(skb_put(skb, len), data, len);
384 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
387 struct ieee80211_chanctx_conf *chanctx_conf;
388 struct ieee80211_channel *chan;
391 if (skb_tailroom(skb) < 3)
395 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
396 if (WARN_ON(!chanctx_conf)) {
400 chan = chanctx_conf->def.chan;
403 pos = skb_put(skb, 2 + 1);
404 *pos++ = WLAN_EID_DS_PARAMS;
406 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
411 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
414 struct ieee80211_local *local = sdata->local;
415 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
416 struct ieee80211_supported_band *sband;
419 sband = local->hw.wiphy->bands[band];
420 if (!sband->ht_cap.ht_supported ||
421 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
422 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
423 sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
426 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
429 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
430 ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
435 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
438 struct ieee80211_local *local = sdata->local;
439 struct ieee80211_chanctx_conf *chanctx_conf;
440 struct ieee80211_channel *channel;
441 enum nl80211_channel_type channel_type =
442 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
443 struct ieee80211_supported_band *sband;
444 struct ieee80211_sta_ht_cap *ht_cap;
448 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
449 if (WARN_ON(!chanctx_conf)) {
453 channel = chanctx_conf->def.chan;
456 sband = local->hw.wiphy->bands[channel->band];
457 ht_cap = &sband->ht_cap;
459 if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
462 if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
465 pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
466 ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
467 sdata->vif.bss_conf.ht_operation_mode);
472 static void ieee80211_mesh_path_timer(unsigned long data)
474 struct ieee80211_sub_if_data *sdata =
475 (struct ieee80211_sub_if_data *) data;
477 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
480 static void ieee80211_mesh_path_root_timer(unsigned long data)
482 struct ieee80211_sub_if_data *sdata =
483 (struct ieee80211_sub_if_data *) data;
484 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
486 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
488 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
491 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
493 if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
494 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
496 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
497 /* stop running timer */
498 del_timer_sync(&ifmsh->mesh_path_root_timer);
503 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
504 * @hdr: 802.11 frame header
505 * @fc: frame control field
506 * @meshda: destination address in the mesh
507 * @meshsa: source address address in the mesh. Same as TA, as frame is
508 * locally originated.
510 * Return the length of the 802.11 (does not include a mesh control header)
512 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
513 const u8 *meshda, const u8 *meshsa)
515 if (is_multicast_ether_addr(meshda)) {
516 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
518 memcpy(hdr->addr1, meshda, ETH_ALEN);
519 memcpy(hdr->addr2, meshsa, ETH_ALEN);
520 memcpy(hdr->addr3, meshsa, ETH_ALEN);
523 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
525 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
526 memcpy(hdr->addr2, meshsa, ETH_ALEN);
527 memcpy(hdr->addr3, meshda, ETH_ALEN);
528 memcpy(hdr->addr4, meshsa, ETH_ALEN);
534 * ieee80211_new_mesh_header - create a new mesh header
535 * @sdata: mesh interface to be used
536 * @meshhdr: uninitialized mesh header
537 * @addr4or5: 1st address in the ae header, which may correspond to address 4
538 * (if addr6 is NULL) or address 5 (if addr6 is present). It may
540 * @addr6: 2nd address in the ae header, which corresponds to addr6 of the
543 * Return the header length.
545 int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
546 struct ieee80211s_hdr *meshhdr,
547 const char *addr4or5, const char *addr6)
549 if (WARN_ON(!addr4or5 && addr6))
552 memset(meshhdr, 0, sizeof(*meshhdr));
554 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
556 /* FIXME: racy -- TX on multiple queues can be concurrent */
557 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
558 sdata->u.mesh.mesh_seqnum++;
560 if (addr4or5 && !addr6) {
561 meshhdr->flags |= MESH_FLAGS_AE_A4;
562 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
564 } else if (addr4or5 && addr6) {
565 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
566 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
567 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
574 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
576 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
579 ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
580 mesh_path_expire(sdata);
582 changed = mesh_accept_plinks_update(sdata);
583 ieee80211_mbss_info_change_notify(sdata, changed);
585 mod_timer(&ifmsh->housekeeping_timer,
586 round_jiffies(jiffies +
587 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
590 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
592 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
595 mesh_path_tx_root_frame(sdata);
597 if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
598 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
600 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
602 mod_timer(&ifmsh->mesh_path_root_timer,
603 round_jiffies(TU_TO_EXP_TIME(interval)));
607 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
609 struct beacon_data *bcn;
610 int head_len, tail_len;
612 struct ieee80211_mgmt *mgmt;
613 struct ieee80211_chanctx_conf *chanctx_conf;
614 struct mesh_csa_settings *csa;
615 enum ieee80211_band band;
617 struct ieee80211_sub_if_data *sdata;
618 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
619 sizeof(mgmt->u.beacon);
621 sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
623 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
624 band = chanctx_conf->def.chan->band;
629 /* Channel Switch Announcement */
630 2 + sizeof(struct ieee80211_channel_sw_ie) +
631 /* Mesh Channel Swith Parameters */
632 2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
633 2 + 8 + /* supported rates */
634 2 + 3; /* DS params */
635 tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
636 2 + sizeof(struct ieee80211_ht_cap) +
637 2 + sizeof(struct ieee80211_ht_operation) +
638 2 + ifmsh->mesh_id_len +
639 2 + sizeof(struct ieee80211_meshconf_ie) +
640 2 + sizeof(__le16) + /* awake window */
643 bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
644 /* need an skb for IE builders to operate on */
645 skb = dev_alloc_skb(max(head_len, tail_len));
651 * pointers go into the block we allocated,
652 * memory is | beacon_data | head | tail |
654 bcn->head = ((u8 *) bcn) + sizeof(*bcn);
656 /* fill in the head */
657 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
658 memset(mgmt, 0, hdr_len);
659 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
660 IEEE80211_STYPE_BEACON);
661 eth_broadcast_addr(mgmt->da);
662 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
663 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
664 ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
665 mgmt->u.beacon.beacon_int =
666 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
667 mgmt->u.beacon.capab_info |= cpu_to_le16(
668 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
670 pos = skb_put(skb, 2);
671 *pos++ = WLAN_EID_SSID;
675 csa = rcu_dereference(ifmsh->csa);
677 pos = skb_put(skb, 13);
679 *pos++ = WLAN_EID_CHANNEL_SWITCH;
682 *pos++ = ieee80211_frequency_to_channel(
683 csa->settings.chandef.chan->center_freq);
684 sdata->csa_counter_offset_beacon = hdr_len + 6;
685 *pos++ = csa->settings.count;
686 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
688 if (ifmsh->chsw_init) {
689 *pos++ = ifmsh->mshcfg.dot11MeshTTL;
690 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
692 *pos++ = ifmsh->chsw_ttl;
694 *pos++ |= csa->settings.block_tx ?
695 WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
696 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
698 put_unaligned_le16(ifmsh->pre_value, pos);
703 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
704 mesh_add_ds_params_ie(sdata, skb))
707 bcn->head_len = skb->len;
708 memcpy(bcn->head, skb->data, bcn->head_len);
712 bcn->tail = bcn->head + bcn->head_len;
714 if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
715 mesh_add_rsn_ie(sdata, skb) ||
716 mesh_add_ht_cap_ie(sdata, skb) ||
717 mesh_add_ht_oper_ie(sdata, skb) ||
718 mesh_add_meshid_ie(sdata, skb) ||
719 mesh_add_meshconf_ie(sdata, skb) ||
720 mesh_add_awake_window_ie(sdata, skb) ||
721 mesh_add_vendor_ies(sdata, skb))
724 bcn->tail_len = skb->len;
725 memcpy(bcn->tail, skb->data, bcn->tail_len);
728 rcu_assign_pointer(ifmsh->beacon, bcn);
737 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
739 struct beacon_data *old_bcn;
742 old_bcn = rcu_dereference_protected(sdata->u.mesh.beacon,
743 lockdep_is_held(&sdata->wdev.mtx));
744 ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
746 /* just reuse old beacon */
750 kfree_rcu(old_bcn, rcu_head);
754 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
757 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
758 unsigned long bits = changed;
764 /* if we race with running work, worst case this work becomes a noop */
765 for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
766 set_bit(bit, &ifmsh->mbss_changed);
767 set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
768 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
771 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
773 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
774 struct ieee80211_local *local = sdata->local;
775 u32 changed = BSS_CHANGED_BEACON |
776 BSS_CHANGED_BEACON_ENABLED |
778 BSS_CHANGED_BASIC_RATES |
779 BSS_CHANGED_BEACON_INT;
781 local->fif_other_bss++;
782 /* mesh ifaces must set allmulti to forward mcast traffic */
783 atomic_inc(&local->iff_allmultis);
784 ieee80211_configure_filter(local);
786 ifmsh->mesh_cc_id = 0; /* Disabled */
787 /* register sync ops from extensible synchronization framework */
788 ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
789 ifmsh->adjusting_tbtt = false;
790 ifmsh->sync_offset_clockdrift_max = 0;
791 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
792 ieee80211_mesh_root_setup(ifmsh);
793 ieee80211_queue_work(&local->hw, &sdata->work);
794 sdata->vif.bss_conf.ht_operation_mode =
795 ifmsh->mshcfg.ht_opmode;
796 sdata->vif.bss_conf.enable_beacon = true;
798 changed |= ieee80211_mps_local_status_update(sdata);
800 if (ieee80211_mesh_build_beacon(ifmsh)) {
801 ieee80211_stop_mesh(sdata);
805 ieee80211_bss_info_change_notify(sdata, changed);
807 netif_carrier_on(sdata->dev);
811 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
813 struct ieee80211_local *local = sdata->local;
814 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
815 struct beacon_data *bcn;
817 netif_carrier_off(sdata->dev);
819 /* stop the beacon */
820 ifmsh->mesh_id_len = 0;
821 sdata->vif.bss_conf.enable_beacon = false;
822 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
823 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
824 bcn = rcu_dereference_protected(ifmsh->beacon,
825 lockdep_is_held(&sdata->wdev.mtx));
826 rcu_assign_pointer(ifmsh->beacon, NULL);
827 kfree_rcu(bcn, rcu_head);
829 /* flush STAs and mpaths on this iface */
830 sta_info_flush(sdata);
831 mesh_path_flush_by_iface(sdata);
833 /* free all potentially still buffered group-addressed frames */
834 local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
835 skb_queue_purge(&ifmsh->ps.bc_buf);
837 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
838 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
839 del_timer_sync(&sdata->u.mesh.mesh_path_timer);
841 /* clear any mesh work (for next join) we may have accrued */
842 ifmsh->wrkq_flags = 0;
843 ifmsh->mbss_changed = 0;
845 local->fif_other_bss--;
846 atomic_dec(&local->iff_allmultis);
847 ieee80211_configure_filter(local);
851 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
852 struct ieee802_11_elems *elems, bool beacon)
854 struct cfg80211_csa_settings params;
855 struct ieee80211_csa_ie csa_ie;
856 struct ieee80211_chanctx_conf *chanctx_conf;
857 struct ieee80211_chanctx *chanctx;
858 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
859 enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
860 int err, num_chanctx;
863 if (sdata->vif.csa_active)
869 sta_flags = IEEE80211_STA_DISABLE_VHT;
870 switch (sdata->vif.bss_conf.chandef.width) {
871 case NL80211_CHAN_WIDTH_20_NOHT:
872 sta_flags |= IEEE80211_STA_DISABLE_HT;
873 case NL80211_CHAN_WIDTH_20:
874 sta_flags |= IEEE80211_STA_DISABLE_40MHZ;
880 memset(¶ms, 0, sizeof(params));
881 memset(&csa_ie, 0, sizeof(csa_ie));
882 err = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, band,
883 sta_flags, sdata->vif.addr,
890 params.chandef = csa_ie.chandef;
891 params.count = csa_ie.count;
893 if (sdata->vif.bss_conf.chandef.chan->band !=
894 params.chandef.chan->band)
897 if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, ¶ms.chandef,
898 IEEE80211_CHAN_DISABLED)) {
900 "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
902 params.chandef.chan->center_freq,
903 params.chandef.width,
904 params.chandef.center_freq1,
905 params.chandef.center_freq2);
909 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
914 params.radar_required = true;
915 /* TODO: DFS not (yet) supported */
920 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
922 goto failed_chswitch;
924 /* don't handle for multi-VIF cases */
925 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
926 if (chanctx->refcount > 1)
927 goto failed_chswitch;
930 list_for_each_entry_rcu(chanctx, &sdata->local->chanctx_list, list)
934 goto failed_chswitch;
939 "received channel switch announcement to go to channel %d MHz\n",
940 params.chandef.chan->center_freq);
942 params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
944 ifmsh->chsw_ttl = csa_ie.ttl - 1;
948 if (ifmsh->chsw_ttl > 0)
949 if (ieee80211_mesh_csa_beacon(sdata, ¶ms, false) < 0)
952 sdata->csa_radar_required = params.radar_required;
955 ieee80211_stop_queues_by_reason(&sdata->local->hw,
956 IEEE80211_MAX_QUEUE_MAP,
957 IEEE80211_QUEUE_STOP_REASON_CSA);
959 sdata->csa_chandef = params.chandef;
960 sdata->vif.csa_active = true;
962 ieee80211_bss_info_change_notify(sdata, err);
963 drv_channel_switch_beacon(sdata, ¶ms.chandef);
972 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
973 struct ieee80211_mgmt *mgmt, size_t len)
975 struct ieee80211_local *local = sdata->local;
976 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
977 struct sk_buff *presp;
978 struct beacon_data *bcn;
979 struct ieee80211_mgmt *hdr;
980 struct ieee802_11_elems elems;
984 pos = mgmt->u.probe_req.variable;
985 baselen = (u8 *) pos - (u8 *) mgmt;
989 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
994 /* 802.11-2012 10.1.4.3.2 */
995 if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
996 !is_broadcast_ether_addr(mgmt->da)) ||
1000 if (elems.mesh_id_len != 0 &&
1001 (elems.mesh_id_len != ifmsh->mesh_id_len ||
1002 memcmp(elems.mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
1006 bcn = rcu_dereference(ifmsh->beacon);
1011 presp = dev_alloc_skb(local->tx_headroom +
1012 bcn->head_len + bcn->tail_len);
1016 skb_reserve(presp, local->tx_headroom);
1017 memcpy(skb_put(presp, bcn->head_len), bcn->head, bcn->head_len);
1018 memcpy(skb_put(presp, bcn->tail_len), bcn->tail, bcn->tail_len);
1019 hdr = (struct ieee80211_mgmt *) presp->data;
1020 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1021 IEEE80211_STYPE_PROBE_RESP);
1022 memcpy(hdr->da, mgmt->sa, ETH_ALEN);
1023 IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1024 ieee80211_tx_skb(sdata, presp);
1029 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
1031 struct ieee80211_mgmt *mgmt,
1033 struct ieee80211_rx_status *rx_status)
1035 struct ieee80211_local *local = sdata->local;
1036 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1037 struct ieee802_11_elems elems;
1038 struct ieee80211_channel *channel;
1041 enum ieee80211_band band = rx_status->band;
1043 /* ignore ProbeResp to foreign address */
1044 if (stype == IEEE80211_STYPE_PROBE_RESP &&
1045 !ether_addr_equal(mgmt->da, sdata->vif.addr))
1048 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1052 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1055 /* ignore non-mesh or secure / unsecure mismatch */
1056 if ((!elems.mesh_id || !elems.mesh_config) ||
1057 (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
1058 (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
1061 if (elems.ds_params)
1062 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
1064 freq = rx_status->freq;
1066 channel = ieee80211_get_channel(local->hw.wiphy, freq);
1068 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1071 if (mesh_matches_local(sdata, &elems))
1072 mesh_neighbour_update(sdata, mgmt->sa, &elems);
1074 if (ifmsh->sync_ops)
1075 ifmsh->sync_ops->rx_bcn_presp(sdata,
1076 stype, mgmt, &elems, rx_status);
1078 if (!ifmsh->chsw_init)
1079 ieee80211_mesh_process_chnswitch(sdata, &elems, true);
1082 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
1084 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1085 struct mesh_csa_settings *tmp_csa_settings;
1088 /* Reset the TTL value and Initiator flag */
1089 ifmsh->chsw_init = false;
1090 ifmsh->chsw_ttl = 0;
1092 /* Remove the CSA and MCSP elements from the beacon */
1093 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1094 rcu_assign_pointer(ifmsh->csa, NULL);
1095 kfree_rcu(tmp_csa_settings, rcu_head);
1096 ret = ieee80211_mesh_rebuild_beacon(sdata);
1100 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1102 mcsa_dbg(sdata, "complete switching to center freq %d MHz",
1103 sdata->vif.bss_conf.chandef.chan->center_freq);
1107 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
1108 struct cfg80211_csa_settings *csa_settings,
1111 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1112 struct mesh_csa_settings *tmp_csa_settings;
1115 tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
1117 if (!tmp_csa_settings)
1120 memcpy(&tmp_csa_settings->settings, csa_settings,
1121 sizeof(struct cfg80211_csa_settings));
1123 rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
1125 ret = ieee80211_mesh_rebuild_beacon(sdata);
1127 tmp_csa_settings = rcu_dereference(ifmsh->csa);
1128 rcu_assign_pointer(ifmsh->csa, NULL);
1129 kfree_rcu(tmp_csa_settings, rcu_head);
1133 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
1136 ieee80211_send_action_csa(sdata, csa_settings);
1141 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
1142 struct ieee80211_mgmt *mgmt, size_t len)
1144 struct ieee80211_mgmt *mgmt_fwd;
1145 struct sk_buff *skb;
1146 struct ieee80211_local *local = sdata->local;
1147 u8 *pos = mgmt->u.action.u.chan_switch.variable;
1150 skb = dev_alloc_skb(local->tx_headroom + len);
1153 skb_reserve(skb, local->tx_headroom);
1154 mgmt_fwd = (struct ieee80211_mgmt *) skb_put(skb, len);
1156 /* offset_ttl is based on whether the secondary channel
1157 * offset is available or not. Substract 1 from the mesh TTL
1158 * and disable the initiator flag before forwarding.
1160 offset_ttl = (len < 42) ? 7 : 10;
1161 *(pos + offset_ttl) -= 1;
1162 *(pos + offset_ttl + 1) &= ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
1163 sdata->u.mesh.chsw_ttl = *(pos + offset_ttl);
1165 memcpy(mgmt_fwd, mgmt, len);
1166 eth_broadcast_addr(mgmt_fwd->da);
1167 memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
1168 memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
1170 ieee80211_tx_skb(sdata, skb);
1174 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
1175 struct ieee80211_mgmt *mgmt, size_t len)
1177 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1178 struct ieee802_11_elems elems;
1180 bool fwd_csa = true;
1184 if (mgmt->u.action.u.measurement.action_code !=
1185 WLAN_ACTION_SPCT_CHL_SWITCH)
1188 pos = mgmt->u.action.u.chan_switch.variable;
1189 baselen = offsetof(struct ieee80211_mgmt,
1190 u.action.u.chan_switch.variable);
1191 ieee802_11_parse_elems(pos, len - baselen, false, &elems);
1193 ttl = elems.mesh_chansw_params_ie->mesh_ttl;
1197 pre_value = le16_to_cpu(elems.mesh_chansw_params_ie->mesh_pre_value);
1198 if (ifmsh->pre_value >= pre_value)
1201 ifmsh->pre_value = pre_value;
1203 if (!ieee80211_mesh_process_chnswitch(sdata, &elems, false)) {
1204 mcsa_dbg(sdata, "Failed to process CSA action frame");
1208 /* forward or re-broadcast the CSA frame */
1210 if (mesh_fwd_csa_frame(sdata, mgmt, len) < 0)
1211 mcsa_dbg(sdata, "Failed to forward the CSA frame");
1215 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
1216 struct ieee80211_mgmt *mgmt,
1218 struct ieee80211_rx_status *rx_status)
1220 switch (mgmt->u.action.category) {
1221 case WLAN_CATEGORY_SELF_PROTECTED:
1222 switch (mgmt->u.action.u.self_prot.action_code) {
1223 case WLAN_SP_MESH_PEERING_OPEN:
1224 case WLAN_SP_MESH_PEERING_CLOSE:
1225 case WLAN_SP_MESH_PEERING_CONFIRM:
1226 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
1230 case WLAN_CATEGORY_MESH_ACTION:
1231 if (mesh_action_is_path_sel(mgmt))
1232 mesh_rx_path_sel_frame(sdata, mgmt, len);
1234 case WLAN_CATEGORY_SPECTRUM_MGMT:
1235 mesh_rx_csa_frame(sdata, mgmt, len);
1240 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1241 struct sk_buff *skb)
1243 struct ieee80211_rx_status *rx_status;
1244 struct ieee80211_mgmt *mgmt;
1249 /* mesh already went down */
1250 if (!sdata->wdev.mesh_id_len)
1253 rx_status = IEEE80211_SKB_RXCB(skb);
1254 mgmt = (struct ieee80211_mgmt *) skb->data;
1255 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
1258 case IEEE80211_STYPE_PROBE_RESP:
1259 case IEEE80211_STYPE_BEACON:
1260 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
1263 case IEEE80211_STYPE_PROBE_REQ:
1264 ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
1266 case IEEE80211_STYPE_ACTION:
1267 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
1271 sdata_unlock(sdata);
1274 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
1276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1277 u32 bit, changed = 0;
1279 for_each_set_bit(bit, &ifmsh->mbss_changed,
1280 sizeof(changed) * BITS_PER_BYTE) {
1281 clear_bit(bit, &ifmsh->mbss_changed);
1282 changed |= BIT(bit);
1285 if (sdata->vif.bss_conf.enable_beacon &&
1286 (changed & (BSS_CHANGED_BEACON |
1288 BSS_CHANGED_BASIC_RATES |
1289 BSS_CHANGED_BEACON_INT)))
1290 if (ieee80211_mesh_rebuild_beacon(sdata))
1293 ieee80211_bss_info_change_notify(sdata, changed);
1296 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
1298 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1302 /* mesh already went down */
1303 if (!sdata->wdev.mesh_id_len)
1306 if (ifmsh->preq_queue_len &&
1308 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
1309 mesh_path_start_discovery(sdata);
1311 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
1312 mesh_mpath_table_grow();
1314 if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
1315 mesh_mpp_table_grow();
1317 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
1318 ieee80211_mesh_housekeeping(sdata);
1320 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
1321 ieee80211_mesh_rootpath(sdata);
1323 if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
1324 mesh_sync_adjust_tbtt(sdata);
1326 if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
1327 mesh_bss_info_changed(sdata);
1329 sdata_unlock(sdata);
1332 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
1334 struct ieee80211_sub_if_data *sdata;
1337 list_for_each_entry_rcu(sdata, &local->interfaces, list)
1338 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1339 ieee80211_sdata_running(sdata))
1340 ieee80211_queue_work(&local->hw, &sdata->work);
1344 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
1346 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1347 static u8 zero_addr[ETH_ALEN] = {};
1349 setup_timer(&ifmsh->housekeeping_timer,
1350 ieee80211_mesh_housekeeping_timer,
1351 (unsigned long) sdata);
1353 ifmsh->accepting_plinks = true;
1354 atomic_set(&ifmsh->mpaths, 0);
1355 mesh_rmc_init(sdata);
1356 ifmsh->last_preq = jiffies;
1357 ifmsh->next_perr = jiffies;
1358 ifmsh->chsw_init = false;
1359 /* Allocate all mesh structures when creating the first mesh interface. */
1360 if (!mesh_allocated)
1362 setup_timer(&ifmsh->mesh_path_timer,
1363 ieee80211_mesh_path_timer,
1364 (unsigned long) sdata);
1365 setup_timer(&ifmsh->mesh_path_root_timer,
1366 ieee80211_mesh_path_root_timer,
1367 (unsigned long) sdata);
1368 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
1369 skb_queue_head_init(&ifmsh->ps.bc_buf);
1370 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
1371 spin_lock_init(&ifmsh->sync_offset_lock);
1372 RCU_INIT_POINTER(ifmsh->beacon, NULL);
1374 sdata->vif.bss_conf.bssid = zero_addr;