1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008, 2009 open80211s Ltd.
4 * Copyright (C) 2019, 2021-2023 Intel Corporation
5 * Author: Luis Carlos Cobo <luisca@cozybit.com>
8 #include <linux/slab.h>
9 #include <linux/etherdevice.h>
10 #include <asm/unaligned.h>
14 #define TEST_FRAME_LEN 8192
15 #define MAX_METRIC 0xffffffff
17 #define LINK_FAIL_THRESH 95
19 #define MAX_PREQ_QUEUE_LEN 64
21 static void mesh_queue_preq(struct mesh_path *, u8);
23 static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae)
27 return get_unaligned_le32(preq_elem + offset);
30 static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae)
34 return get_unaligned_le16(preq_elem + offset);
37 /* HWMP IE processing macros */
39 #define AE_F_SET(x) (*x & AE_F)
40 #define PREQ_IE_FLAGS(x) (*(x))
41 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
42 #define PREQ_IE_TTL(x) (*(x + 2))
43 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
44 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
45 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
46 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
47 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
48 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
49 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
50 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
53 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
54 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
55 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
56 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
57 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
58 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
59 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
60 #define PREP_IE_TARGET_ADDR(x) (x + 3)
61 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
63 #define PERR_IE_TTL(x) (*(x))
64 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
65 #define PERR_IE_TARGET_ADDR(x) (x + 3)
66 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
67 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
69 #define MSEC_TO_TU(x) (x*1000/1024)
70 #define SN_GT(x, y) ((s32)(y - x) < 0)
71 #define SN_LT(x, y) ((s32)(x - y) < 0)
72 #define MAX_SANE_SN_DELTA 32
74 static inline u32 SN_DELTA(u32 x, u32 y)
76 return x >= y ? x - y : y - x;
79 #define net_traversal_jiffies(s) \
80 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
81 #define default_lifetime(s) \
82 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
83 #define min_preq_int_jiff(s) \
84 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
85 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
86 #define disc_timeout_jiff(s) \
87 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
88 #define root_path_confirmation_jiffies(s) \
89 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
91 enum mpath_frame_type {
98 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
100 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
101 const u8 *orig_addr, u32 orig_sn,
102 u8 target_flags, const u8 *target,
103 u32 target_sn, const u8 *da,
104 u8 hop_count, u8 ttl,
105 u32 lifetime, u32 metric, u32 preq_id,
106 struct ieee80211_sub_if_data *sdata)
108 struct ieee80211_local *local = sdata->local;
110 struct ieee80211_mgmt *mgmt;
112 int hdr_len = offsetofend(struct ieee80211_mgmt,
113 u.action.u.mesh_action);
115 skb = dev_alloc_skb(local->tx_headroom +
117 2 + 37); /* max HWMP IE */
120 skb_reserve(skb, local->tx_headroom);
121 mgmt = skb_put_zero(skb, hdr_len);
122 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
123 IEEE80211_STYPE_ACTION);
125 memcpy(mgmt->da, da, ETH_ALEN);
126 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
128 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
129 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
130 mgmt->u.action.u.mesh_action.action_code =
131 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
135 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
137 pos = skb_put(skb, 2 + ie_len);
138 *pos++ = WLAN_EID_PREQ;
141 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr);
143 pos = skb_put(skb, 2 + ie_len);
144 *pos++ = WLAN_EID_PREP;
147 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
148 ie_len = sizeof(struct ieee80211_rann_ie);
149 pos = skb_put(skb, 2 + ie_len);
150 *pos++ = WLAN_EID_RANN;
160 if (action == MPATH_PREP) {
161 memcpy(pos, target, ETH_ALEN);
163 put_unaligned_le32(target_sn, pos);
166 if (action == MPATH_PREQ) {
167 put_unaligned_le32(preq_id, pos);
170 memcpy(pos, orig_addr, ETH_ALEN);
172 put_unaligned_le32(orig_sn, pos);
175 put_unaligned_le32(lifetime, pos); /* interval for RANN */
177 put_unaligned_le32(metric, pos);
179 if (action == MPATH_PREQ) {
180 *pos++ = 1; /* destination count */
181 *pos++ = target_flags;
182 memcpy(pos, target, ETH_ALEN);
184 put_unaligned_le32(target_sn, pos);
186 } else if (action == MPATH_PREP) {
187 memcpy(pos, orig_addr, ETH_ALEN);
189 put_unaligned_le32(orig_sn, pos);
193 ieee80211_tx_skb(sdata, skb);
198 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
199 * headroom in case the frame is encrypted. */
200 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
203 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
204 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
206 skb_reset_mac_header(skb);
207 skb_reset_network_header(skb);
208 skb_reset_transport_header(skb);
210 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
211 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
214 info->control.vif = &sdata->vif;
215 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
216 ieee80211_set_qos_hdr(sdata, skb);
217 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
221 * mesh_path_error_tx - Sends a PERR mesh management frame
223 * @ttl: allowed remaining hops
224 * @target: broken destination
225 * @target_sn: SN of the broken destination
226 * @target_rcode: reason code for this PERR
227 * @ra: node this frame is addressed to
228 * @sdata: local mesh subif
230 * Note: This function may be called with driver locks taken that the driver
231 * also acquires in the TX path. To avoid a deadlock we don't transmit the
232 * frame directly but add it to the pending queue instead.
234 * Returns: 0 on success
236 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
237 u8 ttl, const u8 *target, u32 target_sn,
238 u16 target_rcode, const u8 *ra)
240 struct ieee80211_local *local = sdata->local;
242 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
243 struct ieee80211_mgmt *mgmt;
245 int hdr_len = offsetofend(struct ieee80211_mgmt,
246 u.action.u.mesh_action);
248 if (time_before(jiffies, ifmsh->next_perr))
251 skb = dev_alloc_skb(local->tx_headroom +
252 IEEE80211_ENCRYPT_HEADROOM +
253 IEEE80211_ENCRYPT_TAILROOM +
255 2 + 15 /* PERR IE */);
258 skb_reserve(skb, local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
259 mgmt = skb_put_zero(skb, hdr_len);
260 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
261 IEEE80211_STYPE_ACTION);
263 memcpy(mgmt->da, ra, ETH_ALEN);
264 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
266 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
267 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
268 mgmt->u.action.u.mesh_action.action_code =
269 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
271 pos = skb_put(skb, 2 + ie_len);
272 *pos++ = WLAN_EID_PERR;
276 /* number of destinations */
278 /* Flags field has AE bit only as defined in
279 * sec 8.4.2.117 IEEE802.11-2012
283 memcpy(pos, target, ETH_ALEN);
285 put_unaligned_le32(target_sn, pos);
287 put_unaligned_le16(target_rcode, pos);
289 /* see note in function header */
290 prepare_frame_for_deferred_tx(sdata, skb);
291 ifmsh->next_perr = TU_TO_EXP_TIME(
292 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
293 ieee80211_add_pending_skb(local, skb);
297 void ieee80211s_update_metric(struct ieee80211_local *local,
298 struct sta_info *sta,
299 struct ieee80211_tx_status *st)
301 struct ieee80211_tx_info *txinfo = st->info;
303 struct rate_info rinfo;
305 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
307 /* moving average, scaled to 100.
308 * feed failure as 100 and success as 0
310 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100);
311 if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) >
313 mesh_plink_broken(sta);
315 /* use rate info set by the driver directly if present */
317 rinfo = sta->deflink.tx_stats.last_rate_info;
319 sta_set_rate_info_tx(sta, &sta->deflink.tx_stats.last_rate, &rinfo);
321 ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg,
322 cfg80211_calculate_bitrate(&rinfo));
325 u32 airtime_link_metric_get(struct ieee80211_local *local,
326 struct sta_info *sta)
328 /* This should be adjusted for each device */
329 int device_constant = 1 << ARITH_SHIFT;
330 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
331 int s_unit = 1 << ARITH_SHIFT;
333 u32 tx_time, estimated_retx;
335 unsigned long fail_avg =
336 ewma_mesh_fail_avg_read(&sta->mesh->fail_avg);
338 if (sta->mesh->plink_state != NL80211_PLINK_ESTAB)
341 /* Try to get rate based on HW/SW RC algorithm.
342 * Rate is returned in units of Kbps, correct this
343 * to comply with airtime calculation units
344 * Round up in case we get rate < 100Kbps
346 rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100);
351 if (fail_avg > LINK_FAIL_THRESH)
354 rate = ewma_mesh_tx_rate_avg_read(&sta->mesh->tx_rate_avg);
358 err = (fail_avg << ARITH_SHIFT) / 100;
361 /* bitrate is in units of 100 Kbps, while we need rate in units of
362 * 1Mbps. This will be corrected on tx_time computation.
364 tx_time = (device_constant + 10 * test_frame_len / rate);
365 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
366 result = ((u64)tx_time * estimated_retx) >> (2 * ARITH_SHIFT);
371 * hwmp_route_info_get - Update routing info to originator and transmitter
373 * @sdata: local mesh subif
374 * @mgmt: mesh management frame
375 * @hwmp_ie: hwmp information element (PREP or PREQ)
376 * @action: type of hwmp ie
378 * This function updates the path routing information to the originator and the
379 * transmitter of a HWMP PREQ or PREP frame.
381 * Returns: metric to frame originator or 0 if the frame should not be further
384 * Notes: this function is the only place (besides user-provided info) where
385 * path routing information is updated.
387 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
388 struct ieee80211_mgmt *mgmt,
389 const u8 *hwmp_ie, enum mpath_frame_type action)
391 struct ieee80211_local *local = sdata->local;
392 struct mesh_path *mpath;
393 struct sta_info *sta;
395 const u8 *orig_addr, *ta;
396 u32 orig_sn, orig_metric;
397 unsigned long orig_lifetime, exp_time;
398 u32 last_hop_metric, new_metric;
399 bool flush_mpath = false;
404 sta = sta_info_get(sdata, mgmt->sa);
410 last_hop_metric = airtime_link_metric_get(local, sta);
411 /* Update and check originator routing info */
416 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
417 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
418 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
419 orig_metric = PREQ_IE_METRIC(hwmp_ie);
420 hopcount = PREQ_IE_HOPCOUNT(hwmp_ie) + 1;
423 /* Originator here refers to the MP that was the target in the
424 * Path Request. We divert from the nomenclature in the draft
425 * so that we can easily use a single function to gather path
426 * information from both PREQ and PREP frames.
428 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
429 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
430 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
431 orig_metric = PREP_IE_METRIC(hwmp_ie);
432 hopcount = PREP_IE_HOPCOUNT(hwmp_ie) + 1;
438 new_metric = orig_metric + last_hop_metric;
439 if (new_metric < orig_metric)
440 new_metric = MAX_METRIC;
441 exp_time = TU_TO_EXP_TIME(orig_lifetime);
443 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
444 /* This MP is the originator, we are not interested in this
445 * frame, except for updating transmitter's path info.
450 mpath = mesh_path_lookup(sdata, orig_addr);
452 spin_lock_bh(&mpath->state_lock);
453 if (mpath->flags & MESH_PATH_FIXED)
455 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
456 (mpath->flags & MESH_PATH_SN_VALID)) {
457 if (SN_GT(mpath->sn, orig_sn) ||
458 (mpath->sn == orig_sn &&
459 (rcu_access_pointer(mpath->next_hop) !=
461 mult_frac(new_metric, 10, 9) :
462 new_metric) >= mpath->metric)) {
466 } else if (!(mpath->flags & MESH_PATH_ACTIVE)) {
467 bool have_sn, newer_sn, bounced;
469 have_sn = mpath->flags & MESH_PATH_SN_VALID;
470 newer_sn = have_sn && SN_GT(orig_sn, mpath->sn);
472 (SN_DELTA(orig_sn, mpath->sn) >
475 if (!have_sn || newer_sn) {
476 /* if SN is newer than what we had
477 * then we can take it */;
478 } else if (bounced) {
479 /* if SN is way different than what
480 * we had then assume the other side
481 * rebooted or restarted */;
488 mpath = mesh_path_add(sdata, orig_addr);
493 spin_lock_bh(&mpath->state_lock);
497 if (rcu_access_pointer(mpath->next_hop) != sta) {
498 mpath->path_change_count++;
501 mesh_path_assign_nexthop(mpath, sta);
502 mpath->flags |= MESH_PATH_SN_VALID;
503 mpath->metric = new_metric;
505 mpath->exp_time = time_after(mpath->exp_time, exp_time)
506 ? mpath->exp_time : exp_time;
507 mpath->hop_count = hopcount;
508 mesh_path_activate(mpath);
509 spin_unlock_bh(&mpath->state_lock);
511 mesh_fast_tx_flush_mpath(mpath);
512 ewma_mesh_fail_avg_init(&sta->mesh->fail_avg);
513 /* init it at a low value - 0 start is tricky */
514 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1);
515 mesh_path_tx_pending(mpath);
516 /* draft says preq_id should be saved to, but there does
517 * not seem to be any use for it, skipping by now
520 spin_unlock_bh(&mpath->state_lock);
523 /* Update and check transmitter routing info */
525 if (ether_addr_equal(orig_addr, ta))
530 mpath = mesh_path_lookup(sdata, ta);
532 spin_lock_bh(&mpath->state_lock);
533 if ((mpath->flags & MESH_PATH_FIXED) ||
534 ((mpath->flags & MESH_PATH_ACTIVE) &&
535 ((rcu_access_pointer(mpath->next_hop) != sta ?
536 mult_frac(last_hop_metric, 10, 9) :
537 last_hop_metric) > mpath->metric)))
540 mpath = mesh_path_add(sdata, ta);
545 spin_lock_bh(&mpath->state_lock);
549 if (rcu_access_pointer(mpath->next_hop) != sta) {
550 mpath->path_change_count++;
553 mesh_path_assign_nexthop(mpath, sta);
554 mpath->metric = last_hop_metric;
555 mpath->exp_time = time_after(mpath->exp_time, exp_time)
556 ? mpath->exp_time : exp_time;
557 mpath->hop_count = 1;
558 mesh_path_activate(mpath);
559 spin_unlock_bh(&mpath->state_lock);
561 mesh_fast_tx_flush_mpath(mpath);
562 ewma_mesh_fail_avg_init(&sta->mesh->fail_avg);
563 /* init it at a low value - 0 start is tricky */
564 ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1);
565 mesh_path_tx_pending(mpath);
567 spin_unlock_bh(&mpath->state_lock);
572 return process ? new_metric : 0;
575 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
576 struct ieee80211_mgmt *mgmt,
577 const u8 *preq_elem, u32 orig_metric)
579 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
580 struct mesh_path *mpath = NULL;
581 const u8 *target_addr, *orig_addr;
583 u8 target_flags, ttl, flags;
584 u32 orig_sn, target_sn, lifetime, target_metric = 0;
589 /* Update target SN, if present */
590 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
591 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
592 target_sn = PREQ_IE_TARGET_SN(preq_elem);
593 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
594 target_flags = PREQ_IE_TARGET_F(preq_elem);
595 /* Proactive PREQ gate announcements */
596 flags = PREQ_IE_FLAGS(preq_elem);
597 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
599 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
601 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
602 mhwmp_dbg(sdata, "PREQ is for us\n");
607 if (SN_GT(target_sn, ifmsh->sn))
608 ifmsh->sn = target_sn;
610 if (time_after(jiffies, ifmsh->last_sn_update +
611 net_traversal_jiffies(sdata)) ||
612 time_before(jiffies, ifmsh->last_sn_update)) {
614 ifmsh->last_sn_update = jiffies;
616 target_sn = ifmsh->sn;
617 } else if (is_broadcast_ether_addr(target_addr) &&
618 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
620 mpath = mesh_path_lookup(sdata, orig_addr);
622 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
624 target_addr = sdata->vif.addr;
625 target_sn = ++ifmsh->sn;
627 ifmsh->last_sn_update = jiffies;
630 mesh_path_add_gate(mpath);
635 mpath = mesh_path_lookup(sdata, target_addr);
637 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
638 SN_LT(mpath->sn, target_sn)) {
639 mpath->sn = target_sn;
640 mpath->flags |= MESH_PATH_SN_VALID;
641 } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) &&
642 (mpath->flags & MESH_PATH_ACTIVE)) {
644 target_metric = mpath->metric;
645 target_sn = mpath->sn;
646 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
647 target_flags |= IEEE80211_PREQ_TO_FLAG;
654 lifetime = PREQ_IE_LIFETIME(preq_elem);
655 ttl = ifmsh->mshcfg.element_ttl;
657 mhwmp_dbg(sdata, "replying to the PREQ\n");
658 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
659 orig_sn, 0, target_addr,
660 target_sn, mgmt->sa, 0, ttl,
661 lifetime, target_metric, 0,
664 ifmsh->mshstats.dropped_frames_ttl++;
668 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
672 ttl = PREQ_IE_TTL(preq_elem);
673 lifetime = PREQ_IE_LIFETIME(preq_elem);
675 ifmsh->mshstats.dropped_frames_ttl++;
678 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
680 preq_id = PREQ_IE_PREQ_ID(preq_elem);
681 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
682 da = (mpath && mpath->is_root) ?
683 mpath->rann_snd_addr : broadcast_addr;
685 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
686 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
687 target_sn = PREQ_IE_TARGET_SN(preq_elem);
690 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
691 orig_sn, target_flags, target_addr,
692 target_sn, da, hopcount, ttl, lifetime,
693 orig_metric, preq_id, sdata);
694 if (!is_multicast_ether_addr(da))
695 ifmsh->mshstats.fwded_unicast++;
697 ifmsh->mshstats.fwded_mcast++;
698 ifmsh->mshstats.fwded_frames++;
703 static inline struct sta_info *
704 next_hop_deref_protected(struct mesh_path *mpath)
706 return rcu_dereference_protected(mpath->next_hop,
707 lockdep_is_held(&mpath->state_lock));
711 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
712 struct ieee80211_mgmt *mgmt,
713 const u8 *prep_elem, u32 metric)
715 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
716 struct mesh_path *mpath;
717 const u8 *target_addr, *orig_addr;
718 u8 ttl, hopcount, flags;
719 u8 next_hop[ETH_ALEN];
720 u32 target_sn, orig_sn, lifetime;
722 mhwmp_dbg(sdata, "received PREP from %pM\n",
723 PREP_IE_TARGET_ADDR(prep_elem));
725 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
726 if (ether_addr_equal(orig_addr, sdata->vif.addr))
727 /* destination, no forwarding required */
730 if (!ifmsh->mshcfg.dot11MeshForwarding)
733 ttl = PREP_IE_TTL(prep_elem);
735 sdata->u.mesh.mshstats.dropped_frames_ttl++;
740 mpath = mesh_path_lookup(sdata, orig_addr);
742 spin_lock_bh(&mpath->state_lock);
745 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
746 spin_unlock_bh(&mpath->state_lock);
749 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
750 spin_unlock_bh(&mpath->state_lock);
752 flags = PREP_IE_FLAGS(prep_elem);
753 lifetime = PREP_IE_LIFETIME(prep_elem);
754 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
755 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
756 target_sn = PREP_IE_TARGET_SN(prep_elem);
757 orig_sn = PREP_IE_ORIG_SN(prep_elem);
759 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
760 target_addr, target_sn, next_hop, hopcount,
761 ttl, lifetime, metric, 0, sdata);
764 sdata->u.mesh.mshstats.fwded_unicast++;
765 sdata->u.mesh.mshstats.fwded_frames++;
770 sdata->u.mesh.mshstats.dropped_frames_no_route++;
773 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
774 struct ieee80211_mgmt *mgmt,
777 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
778 struct mesh_path *mpath;
780 const u8 *ta, *target_addr;
785 ttl = PERR_IE_TTL(perr_elem);
787 ifmsh->mshstats.dropped_frames_ttl++;
791 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
792 target_sn = PERR_IE_TARGET_SN(perr_elem);
793 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
796 mpath = mesh_path_lookup(sdata, target_addr);
798 struct sta_info *sta;
800 spin_lock_bh(&mpath->state_lock);
801 sta = next_hop_deref_protected(mpath);
802 if (mpath->flags & MESH_PATH_ACTIVE &&
803 ether_addr_equal(ta, sta->sta.addr) &&
804 !(mpath->flags & MESH_PATH_FIXED) &&
805 (!(mpath->flags & MESH_PATH_SN_VALID) ||
806 SN_GT(target_sn, mpath->sn) || target_sn == 0)) {
807 mpath->flags &= ~MESH_PATH_ACTIVE;
809 mpath->sn = target_sn;
812 spin_unlock_bh(&mpath->state_lock);
813 if (!ifmsh->mshcfg.dot11MeshForwarding)
815 mesh_path_error_tx(sdata, ttl, target_addr,
816 target_sn, target_rcode,
819 spin_unlock_bh(&mpath->state_lock);
825 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
826 struct ieee80211_mgmt *mgmt,
827 const struct ieee80211_rann_ie *rann)
829 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
830 struct ieee80211_local *local = sdata->local;
831 struct sta_info *sta;
832 struct mesh_path *mpath;
833 u8 ttl, flags, hopcount;
835 u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval;
838 ttl = rann->rann_ttl;
839 flags = rann->rann_flags;
840 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
841 orig_addr = rann->rann_addr;
842 orig_sn = le32_to_cpu(rann->rann_seq);
843 interval = le32_to_cpu(rann->rann_interval);
844 hopcount = rann->rann_hopcount;
846 orig_metric = le32_to_cpu(rann->rann_metric);
848 /* Ignore our own RANNs */
849 if (ether_addr_equal(orig_addr, sdata->vif.addr))
853 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
854 orig_addr, mgmt->sa, root_is_gate);
857 sta = sta_info_get(sdata, mgmt->sa);
863 last_hop_metric = airtime_link_metric_get(local, sta);
864 new_metric = orig_metric + last_hop_metric;
865 if (new_metric < orig_metric)
866 new_metric = MAX_METRIC;
868 mpath = mesh_path_lookup(sdata, orig_addr);
870 mpath = mesh_path_add(sdata, orig_addr);
873 sdata->u.mesh.mshstats.dropped_frames_no_route++;
878 if (!(SN_LT(mpath->sn, orig_sn)) &&
879 !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) {
884 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
885 (time_after(jiffies, mpath->last_preq_to_root +
886 root_path_confirmation_jiffies(sdata)) ||
887 time_before(jiffies, mpath->last_preq_to_root))) &&
888 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
890 "time to refresh root mpath %pM\n",
892 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
893 mpath->last_preq_to_root = jiffies;
897 mpath->rann_metric = new_metric;
898 mpath->is_root = true;
899 /* Recording RANNs sender address to send individually
900 * addressed PREQs destined for root mesh STA */
901 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
904 mesh_path_add_gate(mpath);
907 ifmsh->mshstats.dropped_frames_ttl++;
913 if (ifmsh->mshcfg.dot11MeshForwarding) {
914 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
915 orig_sn, 0, NULL, 0, broadcast_addr,
916 hopcount, ttl, interval,
917 new_metric, 0, sdata);
924 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
925 struct ieee80211_mgmt *mgmt, size_t len)
927 struct ieee802_11_elems *elems;
930 struct sta_info *sta;
932 /* need action_code */
933 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
937 sta = sta_info_get(sdata, mgmt->sa);
938 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
944 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
945 elems = ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
946 len - baselen, false, NULL);
951 if (elems->preq_len != 37)
952 /* Right now we support just 1 destination and no AE */
954 path_metric = hwmp_route_info_get(sdata, mgmt, elems->preq,
957 hwmp_preq_frame_process(sdata, mgmt, elems->preq,
961 if (elems->prep_len != 31)
962 /* Right now we support no AE */
964 path_metric = hwmp_route_info_get(sdata, mgmt, elems->prep,
967 hwmp_prep_frame_process(sdata, mgmt, elems->prep,
971 if (elems->perr_len != 15)
972 /* Right now we support only one destination per PERR */
974 hwmp_perr_frame_process(sdata, mgmt, elems->perr);
977 hwmp_rann_frame_process(sdata, mgmt, elems->rann);
983 * mesh_queue_preq - queue a PREQ to a given destination
985 * @mpath: mesh path to discover
986 * @flags: special attributes of the PREQ to be sent
988 * Locking: the function must be called from within a rcu read lock block.
991 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
993 struct ieee80211_sub_if_data *sdata = mpath->sdata;
994 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
995 struct mesh_preq_queue *preq_node;
997 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
999 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
1003 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
1004 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
1005 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1007 if (printk_ratelimit())
1008 mhwmp_dbg(sdata, "PREQ node queue full\n");
1012 spin_lock(&mpath->state_lock);
1013 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
1014 spin_unlock(&mpath->state_lock);
1015 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1020 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
1021 preq_node->flags = flags;
1023 mpath->flags |= MESH_PATH_REQ_QUEUED;
1024 spin_unlock(&mpath->state_lock);
1026 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
1027 ++ifmsh->preq_queue_len;
1028 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1030 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
1031 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1033 else if (time_before(jiffies, ifmsh->last_preq)) {
1034 /* avoid long wait if did not send preqs for a long time
1035 * and jiffies wrapped around
1037 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
1038 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
1040 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
1041 min_preq_int_jiff(sdata));
1045 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
1047 * @sdata: local mesh subif
1049 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
1051 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1052 struct mesh_preq_queue *preq_node;
1053 struct mesh_path *mpath;
1054 u8 ttl, target_flags = 0;
1058 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
1059 if (!ifmsh->preq_queue_len ||
1060 time_before(jiffies, ifmsh->last_preq +
1061 min_preq_int_jiff(sdata))) {
1062 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1066 preq_node = list_first_entry(&ifmsh->preq_queue.list,
1067 struct mesh_preq_queue, list);
1068 list_del(&preq_node->list);
1069 --ifmsh->preq_queue_len;
1070 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1073 mpath = mesh_path_lookup(sdata, preq_node->dst);
1077 spin_lock_bh(&mpath->state_lock);
1078 if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) {
1079 spin_unlock_bh(&mpath->state_lock);
1082 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1083 if (preq_node->flags & PREQ_Q_F_START) {
1084 if (mpath->flags & MESH_PATH_RESOLVING) {
1085 spin_unlock_bh(&mpath->state_lock);
1088 mpath->flags &= ~MESH_PATH_RESOLVED;
1089 mpath->flags |= MESH_PATH_RESOLVING;
1090 mpath->discovery_retries = 0;
1091 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1093 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1094 mpath->flags & MESH_PATH_RESOLVED) {
1095 mpath->flags &= ~MESH_PATH_RESOLVING;
1096 spin_unlock_bh(&mpath->state_lock);
1100 ifmsh->last_preq = jiffies;
1102 if (time_after(jiffies, ifmsh->last_sn_update +
1103 net_traversal_jiffies(sdata)) ||
1104 time_before(jiffies, ifmsh->last_sn_update)) {
1106 sdata->u.mesh.last_sn_update = jiffies;
1108 lifetime = default_lifetime(sdata);
1109 ttl = sdata->u.mesh.mshcfg.element_ttl;
1111 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1112 spin_unlock_bh(&mpath->state_lock);
1116 if (preq_node->flags & PREQ_Q_F_REFRESH)
1117 target_flags |= IEEE80211_PREQ_TO_FLAG;
1119 target_flags &= ~IEEE80211_PREQ_TO_FLAG;
1121 spin_unlock_bh(&mpath->state_lock);
1122 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1123 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1124 target_flags, mpath->dst, mpath->sn, da, 0,
1125 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
1127 spin_lock_bh(&mpath->state_lock);
1128 if (!(mpath->flags & MESH_PATH_DELETED))
1129 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1130 spin_unlock_bh(&mpath->state_lock);
1138 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1140 * @skb: 802.11 frame to be sent
1141 * @sdata: network subif the frame will be sent through
1143 * Lookup next hop for given skb and start path discovery if no
1144 * forwarding information is found.
1146 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1147 * skb is freed here if no mpath could be allocated.
1149 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1150 struct sk_buff *skb)
1152 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1154 struct mesh_path *mpath;
1155 struct sk_buff *skb_to_free = NULL;
1156 u8 *target_addr = hdr->addr3;
1158 /* Nulls are only sent to peers for PS and should be pre-addressed */
1159 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1162 /* Allow injected packets to bypass mesh routing */
1163 if (info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP)
1166 if (!mesh_nexthop_lookup(sdata, skb))
1169 /* no nexthop found, start resolving */
1170 mpath = mesh_path_lookup(sdata, target_addr);
1172 mpath = mesh_path_add(sdata, target_addr);
1173 if (IS_ERR(mpath)) {
1174 mesh_path_discard_frame(sdata, skb);
1175 return PTR_ERR(mpath);
1179 if (!(mpath->flags & MESH_PATH_RESOLVING) &&
1180 mesh_path_sel_is_hwmp(sdata))
1181 mesh_queue_preq(mpath, PREQ_Q_F_START);
1183 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1184 skb_to_free = skb_dequeue(&mpath->frame_queue);
1186 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1187 ieee80211_set_qos_hdr(sdata, skb);
1188 skb_queue_tail(&mpath->frame_queue, skb);
1190 mesh_path_discard_frame(sdata, skb_to_free);
1196 * mesh_nexthop_lookup_nolearn - try to set next hop without path discovery
1197 * @skb: 802.11 frame to be sent
1198 * @sdata: network subif the frame will be sent through
1200 * Check if the meshDA (addr3) of a unicast frame is a direct neighbor.
1201 * And if so, set the RA (addr1) to it to transmit to this node directly,
1202 * avoiding PREQ/PREP path discovery.
1204 * Returns: 0 if the next hop was found and -ENOENT otherwise.
1206 static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata,
1207 struct sk_buff *skb)
1209 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1210 struct sta_info *sta;
1212 if (is_multicast_ether_addr(hdr->addr1))
1216 sta = sta_info_get(sdata, hdr->addr3);
1218 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
1224 memcpy(hdr->addr1, hdr->addr3, ETH_ALEN);
1225 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1229 void mesh_path_refresh(struct ieee80211_sub_if_data *sdata,
1230 struct mesh_path *mpath, const u8 *addr)
1232 if (mpath->flags & (MESH_PATH_REQ_QUEUED | MESH_PATH_FIXED |
1233 MESH_PATH_RESOLVING))
1236 if (time_after(jiffies,
1238 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1239 (!addr || ether_addr_equal(sdata->vif.addr, addr)))
1240 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1244 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1245 * this function is considered "using" the associated mpath, so preempt a path
1246 * refresh if this mpath expires soon.
1248 * @skb: 802.11 frame to be sent
1249 * @sdata: network subif the frame will be sent through
1251 * Returns: 0 if the next hop was found. Nonzero otherwise.
1253 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1254 struct sk_buff *skb)
1256 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1257 struct mesh_path *mpath;
1258 struct sta_info *next_hop;
1259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1260 u8 *target_addr = hdr->addr3;
1262 if (ifmsh->mshcfg.dot11MeshNolearn &&
1263 !mesh_nexthop_lookup_nolearn(sdata, skb))
1266 mpath = mesh_path_lookup(sdata, target_addr);
1267 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1270 mesh_path_refresh(sdata, mpath, hdr->addr4);
1272 next_hop = rcu_dereference(mpath->next_hop);
1274 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1275 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1276 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
1277 if (ieee80211_hw_check(&sdata->local->hw, SUPPORT_FAST_XMIT))
1278 mesh_fast_tx_cache(sdata, skb, mpath);
1285 void mesh_path_timer(struct timer_list *t)
1287 struct mesh_path *mpath = from_timer(mpath, t, timer);
1288 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1291 if (sdata->local->quiescing)
1294 spin_lock_bh(&mpath->state_lock);
1295 if (mpath->flags & MESH_PATH_RESOLVED ||
1296 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1297 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1298 spin_unlock_bh(&mpath->state_lock);
1299 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1300 ++mpath->discovery_retries;
1301 mpath->discovery_timeout *= 2;
1302 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1303 spin_unlock_bh(&mpath->state_lock);
1304 mesh_queue_preq(mpath, 0);
1306 mpath->flags &= ~(MESH_PATH_RESOLVING |
1307 MESH_PATH_RESOLVED |
1308 MESH_PATH_REQ_QUEUED);
1309 mpath->exp_time = jiffies;
1310 spin_unlock_bh(&mpath->state_lock);
1311 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1312 ret = mesh_path_send_to_gates(mpath);
1314 mhwmp_dbg(sdata, "no gate was reachable\n");
1316 mesh_path_flush_pending(mpath);
1320 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1322 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1323 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1324 u8 flags, target_flags = 0;
1326 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1327 ? RANN_FLAG_IS_GATE : 0;
1329 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1330 case IEEE80211_PROACTIVE_RANN:
1331 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1332 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1333 0, ifmsh->mshcfg.element_ttl,
1334 interval, 0, 0, sdata);
1336 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1337 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1339 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1340 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1341 target_flags |= IEEE80211_PREQ_TO_FLAG |
1342 IEEE80211_PREQ_USN_FLAG;
1343 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1344 ++ifmsh->sn, target_flags,
1345 (u8 *) broadcast_addr, 0, broadcast_addr,
1346 0, ifmsh->mshcfg.element_ttl, interval,
1347 0, ifmsh->preq_id++, sdata);
1350 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");