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/slab.h>
14 #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG
15 #define mhwmp_dbg(fmt, args...) \
16 printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args)
18 #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0)
21 #define TEST_FRAME_LEN 8192
22 #define MAX_METRIC 0xffffffff
25 /* Number of frames buffered per destination for unresolved destinations */
26 #define MESH_FRAME_QUEUE_LEN 10
27 #define MAX_PREQ_QUEUE_LEN 64
29 /* Destination only */
31 /* Reply and forward */
33 /* Unknown Sequence Number */
35 /* Reason code Present */
36 #define MP_F_RCODE 0x02
38 static void mesh_queue_preq(struct mesh_path *, u8);
40 static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
44 return get_unaligned_le32(preq_elem + offset);
47 static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae)
51 return get_unaligned_le16(preq_elem + offset);
54 /* HWMP IE processing macros */
56 #define AE_F_SET(x) (*x & AE_F)
57 #define PREQ_IE_FLAGS(x) (*(x))
58 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
59 #define PREQ_IE_TTL(x) (*(x + 2))
60 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
61 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
62 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
63 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
64 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
65 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
66 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
67 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
70 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
71 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
72 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
73 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
74 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
75 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
76 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
77 #define PREP_IE_TARGET_ADDR(x) (x + 3)
78 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
80 #define PERR_IE_TTL(x) (*(x))
81 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
82 #define PERR_IE_TARGET_ADDR(x) (x + 3)
83 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
84 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
86 #define MSEC_TO_TU(x) (x*1000/1024)
87 #define SN_GT(x, y) ((long) (y) - (long) (x) < 0)
88 #define SN_LT(x, y) ((long) (x) - (long) (y) < 0)
90 #define net_traversal_jiffies(s) \
91 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
92 #define default_lifetime(s) \
93 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
94 #define min_preq_int_jiff(s) \
95 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
96 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
97 #define disc_timeout_jiff(s) \
98 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
100 enum mpath_frame_type {
107 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
109 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
110 u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target,
111 __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl,
112 __le32 lifetime, __le32 metric, __le32 preq_id,
113 struct ieee80211_sub_if_data *sdata)
115 struct ieee80211_local *local = sdata->local;
116 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
117 struct ieee80211_mgmt *mgmt;
123 skb_reserve(skb, local->hw.extra_tx_headroom);
124 /* 25 is the size of the common mgmt part (24) plus the size of the
125 * common action part (1)
127 mgmt = (struct ieee80211_mgmt *)
128 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
129 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
130 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
131 IEEE80211_STYPE_ACTION);
133 memcpy(mgmt->da, da, ETH_ALEN);
134 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
136 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
137 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
138 mgmt->u.action.u.mesh_action.action_code =
139 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
143 mhwmp_dbg("sending PREQ to %pM", target);
145 pos = skb_put(skb, 2 + ie_len);
146 *pos++ = WLAN_EID_PREQ;
149 mhwmp_dbg("sending PREP to %pM", target);
151 pos = skb_put(skb, 2 + ie_len);
152 *pos++ = WLAN_EID_PREP;
155 mhwmp_dbg("sending RANN from %pM", orig_addr);
156 ie_len = sizeof(struct ieee80211_rann_ie);
157 pos = skb_put(skb, 2 + ie_len);
158 *pos++ = WLAN_EID_RANN;
169 if (action == MPATH_PREP) {
170 memcpy(pos, target, ETH_ALEN);
172 memcpy(pos, &target_sn, 4);
175 if (action == MPATH_PREQ) {
176 memcpy(pos, &preq_id, 4);
179 memcpy(pos, orig_addr, ETH_ALEN);
181 memcpy(pos, &orig_sn, 4);
184 memcpy(pos, &lifetime, 4); /* interval for RANN */
186 memcpy(pos, &metric, 4);
188 if (action == MPATH_PREQ) {
189 *pos++ = 1; /* destination count */
190 *pos++ = target_flags;
191 memcpy(pos, target, ETH_ALEN);
193 memcpy(pos, &target_sn, 4);
195 } else if (action == MPATH_PREP) {
196 memcpy(pos, orig_addr, ETH_ALEN);
198 memcpy(pos, &orig_sn, 4);
202 ieee80211_tx_skb(sdata, skb);
207 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
208 * headroom in case the frame is encrypted. */
209 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
212 struct ieee80211_local *local = sdata->local;
213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
215 skb_set_mac_header(skb, 0);
216 skb_set_network_header(skb, 0);
217 skb_set_transport_header(skb, 0);
219 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
220 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
223 info->control.vif = &sdata->vif;
224 ieee80211_set_qos_hdr(local, skb);
228 * mesh_send_path error - Sends a PERR mesh management frame
230 * @target: broken destination
231 * @target_sn: SN of the broken destination
232 * @target_rcode: reason code for this PERR
233 * @ra: node this frame is addressed to
235 * Note: This function may be called with driver locks taken that the driver
236 * also acquires in the TX path. To avoid a deadlock we don't transmit the
237 * frame directly but add it to the pending queue instead.
239 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
240 __le16 target_rcode, const u8 *ra,
241 struct ieee80211_sub_if_data *sdata)
243 struct ieee80211_local *local = sdata->local;
244 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
245 struct ieee80211_mgmt *mgmt;
251 skb_reserve(skb, local->tx_headroom + local->hw.extra_tx_headroom);
252 /* 25 is the size of the common mgmt part (24) plus the size of the
253 * common action part (1)
255 mgmt = (struct ieee80211_mgmt *)
256 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
257 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
258 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
259 IEEE80211_STYPE_ACTION);
261 memcpy(mgmt->da, ra, ETH_ALEN);
262 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
264 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
265 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
266 mgmt->u.action.u.mesh_action.action_code =
267 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
269 pos = skb_put(skb, 2 + ie_len);
270 *pos++ = WLAN_EID_PERR;
274 /* number of destinations */
277 * flags bit, bit 1 is unset if we know the sequence number and
278 * bit 2 is set if we have a reason code
286 memcpy(pos, target, ETH_ALEN);
288 memcpy(pos, &target_sn, 4);
290 memcpy(pos, &target_rcode, 2);
292 /* see note in function header */
293 prepare_frame_for_deferred_tx(sdata, skb);
294 ieee80211_add_pending_skb(local, skb);
298 void ieee80211s_update_metric(struct ieee80211_local *local,
299 struct sta_info *stainfo, struct sk_buff *skb)
301 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
302 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
305 if (!ieee80211_is_data(hdr->frame_control))
308 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
310 /* moving average, scaled to 100 */
311 stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed);
312 if (stainfo->fail_avg > 95)
313 mesh_plink_broken(stainfo);
316 static u32 airtime_link_metric_get(struct ieee80211_local *local,
317 struct sta_info *sta)
319 struct ieee80211_supported_band *sband;
320 /* This should be adjusted for each device */
321 int device_constant = 1 << ARITH_SHIFT;
322 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
323 int s_unit = 1 << ARITH_SHIFT;
325 u32 tx_time, estimated_retx;
328 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
330 if (sta->fail_avg >= 100)
333 if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
336 err = (sta->fail_avg << ARITH_SHIFT) / 100;
338 /* bitrate is in units of 100 Kbps, while we need rate in units of
339 * 1Mbps. This will be corrected on tx_time computation.
341 rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
342 tx_time = (device_constant + 10 * test_frame_len / rate);
343 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
344 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
349 * hwmp_route_info_get - Update routing info to originator and transmitter
351 * @sdata: local mesh subif
352 * @mgmt: mesh management frame
353 * @hwmp_ie: hwmp information element (PREP or PREQ)
355 * This function updates the path routing information to the originator and the
356 * transmitter of a HWMP PREQ or PREP frame.
358 * Returns: metric to frame originator or 0 if the frame should not be further
361 * Notes: this function is the only place (besides user-provided info) where
362 * path routing information is updated.
364 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
365 struct ieee80211_mgmt *mgmt,
366 u8 *hwmp_ie, enum mpath_frame_type action)
368 struct ieee80211_local *local = sdata->local;
369 struct mesh_path *mpath;
370 struct sta_info *sta;
373 u32 orig_sn, orig_metric;
374 unsigned long orig_lifetime, exp_time;
375 u32 last_hop_metric, new_metric;
379 sta = sta_info_get(sdata, mgmt->sa);
385 last_hop_metric = airtime_link_metric_get(local, sta);
386 /* Update and check originator routing info */
391 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
392 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
393 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
394 orig_metric = PREQ_IE_METRIC(hwmp_ie);
397 /* Originator here refers to the MP that was the destination in
398 * the Path Request. The draft refers to that MP as the
399 * destination address, even though usually it is the origin of
400 * the PREP frame. We divert from the nomenclature in the draft
401 * so that we can easily use a single function to gather path
402 * information from both PREQ and PREP frames.
404 orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie);
405 orig_sn = PREP_IE_ORIG_SN(hwmp_ie);
406 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
407 orig_metric = PREP_IE_METRIC(hwmp_ie);
413 new_metric = orig_metric + last_hop_metric;
414 if (new_metric < orig_metric)
415 new_metric = MAX_METRIC;
416 exp_time = TU_TO_EXP_TIME(orig_lifetime);
418 if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) {
419 /* This MP is the originator, we are not interested in this
420 * frame, except for updating transmitter's path info.
425 mpath = mesh_path_lookup(orig_addr, sdata);
427 spin_lock_bh(&mpath->state_lock);
428 if (mpath->flags & MESH_PATH_FIXED)
430 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
431 (mpath->flags & MESH_PATH_SN_VALID)) {
432 if (SN_GT(mpath->sn, orig_sn) ||
433 (mpath->sn == orig_sn &&
434 new_metric >= mpath->metric)) {
440 mesh_path_add(orig_addr, sdata);
441 mpath = mesh_path_lookup(orig_addr, sdata);
446 spin_lock_bh(&mpath->state_lock);
450 mesh_path_assign_nexthop(mpath, sta);
451 mpath->flags |= MESH_PATH_SN_VALID;
452 mpath->metric = new_metric;
454 mpath->exp_time = time_after(mpath->exp_time, exp_time)
455 ? mpath->exp_time : exp_time;
456 mesh_path_activate(mpath);
457 spin_unlock_bh(&mpath->state_lock);
458 mesh_path_tx_pending(mpath);
459 /* draft says preq_id should be saved to, but there does
460 * not seem to be any use for it, skipping by now
463 spin_unlock_bh(&mpath->state_lock);
466 /* Update and check transmitter routing info */
468 if (memcmp(orig_addr, ta, ETH_ALEN) == 0)
473 mpath = mesh_path_lookup(ta, sdata);
475 spin_lock_bh(&mpath->state_lock);
476 if ((mpath->flags & MESH_PATH_FIXED) ||
477 ((mpath->flags & MESH_PATH_ACTIVE) &&
478 (last_hop_metric > mpath->metric)))
481 mesh_path_add(ta, sdata);
482 mpath = mesh_path_lookup(ta, sdata);
487 spin_lock_bh(&mpath->state_lock);
491 mesh_path_assign_nexthop(mpath, sta);
492 mpath->metric = last_hop_metric;
493 mpath->exp_time = time_after(mpath->exp_time, exp_time)
494 ? mpath->exp_time : exp_time;
495 mesh_path_activate(mpath);
496 spin_unlock_bh(&mpath->state_lock);
497 mesh_path_tx_pending(mpath);
499 spin_unlock_bh(&mpath->state_lock);
504 return process ? new_metric : 0;
507 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
508 struct ieee80211_mgmt *mgmt,
509 u8 *preq_elem, u32 metric)
511 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
512 struct mesh_path *mpath;
513 u8 *target_addr, *orig_addr;
514 u8 target_flags, ttl;
515 u32 orig_sn, target_sn, lifetime;
519 /* Update target SN, if present */
520 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
521 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
522 target_sn = PREQ_IE_TARGET_SN(preq_elem);
523 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
524 target_flags = PREQ_IE_TARGET_F(preq_elem);
526 mhwmp_dbg("received PREQ from %pM", orig_addr);
528 if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) {
529 mhwmp_dbg("PREQ is for us");
533 if (time_after(jiffies, ifmsh->last_sn_update +
534 net_traversal_jiffies(sdata)) ||
535 time_before(jiffies, ifmsh->last_sn_update)) {
536 target_sn = ++ifmsh->sn;
537 ifmsh->last_sn_update = jiffies;
541 mpath = mesh_path_lookup(target_addr, sdata);
543 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
544 SN_LT(mpath->sn, target_sn)) {
545 mpath->sn = target_sn;
546 mpath->flags |= MESH_PATH_SN_VALID;
547 } else if ((!(target_flags & MP_F_DO)) &&
548 (mpath->flags & MESH_PATH_ACTIVE)) {
550 metric = mpath->metric;
551 target_sn = mpath->sn;
552 if (target_flags & MP_F_RF)
553 target_flags |= MP_F_DO;
562 lifetime = PREQ_IE_LIFETIME(preq_elem);
563 ttl = ifmsh->mshcfg.element_ttl;
565 mhwmp_dbg("replying to the PREQ");
566 mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr,
567 cpu_to_le32(target_sn), 0, orig_addr,
568 cpu_to_le32(orig_sn), mgmt->sa, 0, ttl,
569 cpu_to_le32(lifetime), cpu_to_le32(metric),
572 ifmsh->mshstats.dropped_frames_ttl++;
579 ttl = PREQ_IE_TTL(preq_elem);
580 lifetime = PREQ_IE_LIFETIME(preq_elem);
582 ifmsh->mshstats.dropped_frames_ttl++;
585 mhwmp_dbg("forwarding the PREQ from %pM", orig_addr);
587 flags = PREQ_IE_FLAGS(preq_elem);
588 preq_id = PREQ_IE_PREQ_ID(preq_elem);
589 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
590 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
591 cpu_to_le32(orig_sn), target_flags, target_addr,
592 cpu_to_le32(target_sn), broadcast_addr,
593 hopcount, ttl, cpu_to_le32(lifetime),
594 cpu_to_le32(metric), cpu_to_le32(preq_id),
596 ifmsh->mshstats.fwded_mcast++;
597 ifmsh->mshstats.fwded_frames++;
602 static inline struct sta_info *
603 next_hop_deref_protected(struct mesh_path *mpath)
605 return rcu_dereference_protected(mpath->next_hop,
606 lockdep_is_held(&mpath->state_lock));
610 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
611 struct ieee80211_mgmt *mgmt,
612 u8 *prep_elem, u32 metric)
614 struct mesh_path *mpath;
615 u8 *target_addr, *orig_addr;
616 u8 ttl, hopcount, flags;
617 u8 next_hop[ETH_ALEN];
618 u32 target_sn, orig_sn, lifetime;
620 mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem));
622 /* Note that we divert from the draft nomenclature and denominate
623 * destination to what the draft refers to as origininator. So in this
624 * function destnation refers to the final destination of the PREP,
625 * which corresponds with the originator of the PREQ which this PREP
628 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
629 if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0)
630 /* destination, no forwarding required */
633 ttl = PREP_IE_TTL(prep_elem);
635 sdata->u.mesh.mshstats.dropped_frames_ttl++;
640 mpath = mesh_path_lookup(target_addr, sdata);
642 spin_lock_bh(&mpath->state_lock);
645 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
646 spin_unlock_bh(&mpath->state_lock);
649 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
650 spin_unlock_bh(&mpath->state_lock);
652 flags = PREP_IE_FLAGS(prep_elem);
653 lifetime = PREP_IE_LIFETIME(prep_elem);
654 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
655 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
656 target_sn = PREP_IE_TARGET_SN(prep_elem);
657 orig_sn = PREP_IE_ORIG_SN(prep_elem);
659 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
660 cpu_to_le32(orig_sn), 0, target_addr,
661 cpu_to_le32(target_sn), next_hop, hopcount,
662 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
666 sdata->u.mesh.mshstats.fwded_unicast++;
667 sdata->u.mesh.mshstats.fwded_frames++;
672 sdata->u.mesh.mshstats.dropped_frames_no_route++;
675 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
676 struct ieee80211_mgmt *mgmt, u8 *perr_elem)
678 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
679 struct mesh_path *mpath;
681 u8 *ta, *target_addr;
686 ttl = PERR_IE_TTL(perr_elem);
688 ifmsh->mshstats.dropped_frames_ttl++;
692 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
693 target_sn = PERR_IE_TARGET_SN(perr_elem);
694 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
697 mpath = mesh_path_lookup(target_addr, sdata);
699 spin_lock_bh(&mpath->state_lock);
700 if (mpath->flags & MESH_PATH_ACTIVE &&
701 memcmp(ta, next_hop_deref_protected(mpath)->sta.addr,
703 (!(mpath->flags & MESH_PATH_SN_VALID) ||
704 SN_GT(target_sn, mpath->sn))) {
705 mpath->flags &= ~MESH_PATH_ACTIVE;
706 mpath->sn = target_sn;
707 spin_unlock_bh(&mpath->state_lock);
708 mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn),
709 cpu_to_le16(target_rcode),
710 broadcast_addr, sdata);
712 spin_unlock_bh(&mpath->state_lock);
717 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
718 struct ieee80211_mgmt *mgmt,
719 struct ieee80211_rann_ie *rann)
721 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
722 struct mesh_path *mpath;
723 u8 ttl, flags, hopcount;
726 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
729 ttl = rann->rann_ttl;
731 ifmsh->mshstats.dropped_frames_ttl++;
735 flags = rann->rann_flags;
736 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
737 orig_addr = rann->rann_addr;
738 orig_sn = rann->rann_seq;
739 hopcount = rann->rann_hopcount;
741 metric = rann->rann_metric;
743 /* Ignore our own RANNs */
744 if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0)
747 mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr,
751 mpath = mesh_path_lookup(orig_addr, sdata);
753 mesh_path_add(orig_addr, sdata);
754 mpath = mesh_path_lookup(orig_addr, sdata);
757 sdata->u.mesh.mshstats.dropped_frames_no_route++;
762 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
763 time_after(jiffies, mpath->exp_time - 1*HZ)) &&
764 !(mpath->flags & MESH_PATH_FIXED)) {
765 mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name,
767 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
770 if (mpath->sn < orig_sn) {
771 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
772 cpu_to_le32(orig_sn),
773 0, NULL, 0, broadcast_addr,
774 hopcount, ttl, cpu_to_le32(interval),
775 cpu_to_le32(metric + mpath->metric),
780 mesh_path_add_gate(mpath);
786 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
787 struct ieee80211_mgmt *mgmt,
790 struct ieee802_11_elems elems;
794 /* need action_code */
795 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
798 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
799 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
800 len - baselen, &elems);
803 if (elems.preq_len != 37)
804 /* Right now we support just 1 destination and no AE */
806 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
809 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
813 if (elems.prep_len != 31)
814 /* Right now we support no AE */
816 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
819 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
823 if (elems.perr_len != 15)
824 /* Right now we support only one destination per PERR */
826 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
829 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
833 * mesh_queue_preq - queue a PREQ to a given destination
835 * @mpath: mesh path to discover
836 * @flags: special attributes of the PREQ to be sent
838 * Locking: the function must be called from within a rcu read lock block.
841 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
843 struct ieee80211_sub_if_data *sdata = mpath->sdata;
844 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
845 struct mesh_preq_queue *preq_node;
847 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
849 mhwmp_dbg("could not allocate PREQ node");
853 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
854 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
855 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
857 if (printk_ratelimit())
858 mhwmp_dbg("PREQ node queue full");
862 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
863 preq_node->flags = flags;
865 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
866 ++ifmsh->preq_queue_len;
867 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
869 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
870 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
872 else if (time_before(jiffies, ifmsh->last_preq)) {
873 /* avoid long wait if did not send preqs for a long time
874 * and jiffies wrapped around
876 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
877 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
879 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
880 min_preq_int_jiff(sdata));
884 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
886 * @sdata: local mesh subif
888 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
890 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
891 struct mesh_preq_queue *preq_node;
892 struct mesh_path *mpath;
893 u8 ttl, target_flags;
896 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
897 if (!ifmsh->preq_queue_len ||
898 time_before(jiffies, ifmsh->last_preq +
899 min_preq_int_jiff(sdata))) {
900 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
904 preq_node = list_first_entry(&ifmsh->preq_queue.list,
905 struct mesh_preq_queue, list);
906 list_del(&preq_node->list);
907 --ifmsh->preq_queue_len;
908 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
911 mpath = mesh_path_lookup(preq_node->dst, sdata);
915 spin_lock_bh(&mpath->state_lock);
916 if (preq_node->flags & PREQ_Q_F_START) {
917 if (mpath->flags & MESH_PATH_RESOLVING) {
918 spin_unlock_bh(&mpath->state_lock);
921 mpath->flags &= ~MESH_PATH_RESOLVED;
922 mpath->flags |= MESH_PATH_RESOLVING;
923 mpath->discovery_retries = 0;
924 mpath->discovery_timeout = disc_timeout_jiff(sdata);
926 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
927 mpath->flags & MESH_PATH_RESOLVED) {
928 mpath->flags &= ~MESH_PATH_RESOLVING;
929 spin_unlock_bh(&mpath->state_lock);
933 ifmsh->last_preq = jiffies;
935 if (time_after(jiffies, ifmsh->last_sn_update +
936 net_traversal_jiffies(sdata)) ||
937 time_before(jiffies, ifmsh->last_sn_update)) {
939 sdata->u.mesh.last_sn_update = jiffies;
941 lifetime = default_lifetime(sdata);
942 ttl = sdata->u.mesh.mshcfg.element_ttl;
944 sdata->u.mesh.mshstats.dropped_frames_ttl++;
945 spin_unlock_bh(&mpath->state_lock);
949 if (preq_node->flags & PREQ_Q_F_REFRESH)
950 target_flags = MP_F_DO;
952 target_flags = MP_F_RF;
954 spin_unlock_bh(&mpath->state_lock);
955 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr,
956 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
957 cpu_to_le32(mpath->sn), broadcast_addr, 0,
958 ttl, cpu_to_le32(lifetime), 0,
959 cpu_to_le32(ifmsh->preq_id++), sdata);
960 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
968 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
970 * @skb: 802.11 frame to be sent
971 * @sdata: network subif the frame will be sent through
973 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
974 * found, the function will start a path discovery and queue the frame so it is
975 * sent when the path is resolved. This means the caller must not free the skb
978 int mesh_nexthop_lookup(struct sk_buff *skb,
979 struct ieee80211_sub_if_data *sdata)
981 struct sk_buff *skb_to_free = NULL;
982 struct mesh_path *mpath;
983 struct sta_info *next_hop;
984 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
985 u8 *target_addr = hdr->addr3;
989 mpath = mesh_path_lookup(target_addr, sdata);
992 mesh_path_add(target_addr, sdata);
993 mpath = mesh_path_lookup(target_addr, sdata);
995 sdata->u.mesh.mshstats.dropped_frames_no_route++;
1001 if (mpath->flags & MESH_PATH_ACTIVE) {
1002 if (time_after(jiffies,
1004 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1005 !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) &&
1006 !(mpath->flags & MESH_PATH_RESOLVING) &&
1007 !(mpath->flags & MESH_PATH_FIXED)) {
1008 mesh_queue_preq(mpath,
1009 PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1011 next_hop = rcu_dereference(mpath->next_hop);
1013 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1017 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1018 if (!(mpath->flags & MESH_PATH_RESOLVING)) {
1019 /* Start discovery only if it is not running yet */
1020 mesh_queue_preq(mpath, PREQ_Q_F_START);
1023 if (skb_queue_len(&mpath->frame_queue) >=
1024 MESH_FRAME_QUEUE_LEN)
1025 skb_to_free = skb_dequeue(&mpath->frame_queue);
1027 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1028 skb_queue_tail(&mpath->frame_queue, skb);
1030 mesh_path_discard_frame(skb_to_free, sdata);
1039 void mesh_path_timer(unsigned long data)
1041 struct mesh_path *mpath = (void *) data;
1042 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1045 if (sdata->local->quiescing)
1048 spin_lock_bh(&mpath->state_lock);
1049 if (mpath->flags & MESH_PATH_RESOLVED ||
1050 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1051 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1052 spin_unlock_bh(&mpath->state_lock);
1053 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1054 ++mpath->discovery_retries;
1055 mpath->discovery_timeout *= 2;
1056 spin_unlock_bh(&mpath->state_lock);
1057 mesh_queue_preq(mpath, 0);
1060 mpath->exp_time = jiffies;
1061 spin_unlock_bh(&mpath->state_lock);
1062 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1063 ret = mesh_path_send_to_gates(mpath);
1065 mhwmp_dbg("no gate was reachable");
1067 mesh_path_flush_pending(mpath);
1072 mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1074 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1075 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1078 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1079 ? RANN_FLAG_IS_GATE : 0;
1080 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1081 cpu_to_le32(++ifmsh->sn),
1082 0, NULL, 0, broadcast_addr,
1083 0, sdata->u.mesh.mshcfg.element_ttl,
1084 cpu_to_le32(interval), 0, 0, sdata);