2 * Copyright (c) 2008 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.
12 #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG
13 #define mhwmp_dbg(fmt, args...) printk(KERN_DEBUG "Mesh HWMP: " fmt, ##args)
15 #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0)
18 #define TEST_FRAME_LEN 8192
19 #define MAX_METRIC 0xffffffff
22 /* Number of frames buffered per destination for unresolved destinations */
23 #define MESH_FRAME_QUEUE_LEN 10
24 #define MAX_PREQ_QUEUE_LEN 64
26 /* Destination only */
28 /* Reply and forward */
31 static void mesh_queue_preq(struct mesh_path *, u8);
33 static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
37 return get_unaligned_le32(preq_elem + offset);
40 /* HWMP IE processing macros */
42 #define AE_F_SET(x) (*x & AE_F)
43 #define PREQ_IE_FLAGS(x) (*(x))
44 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
45 #define PREQ_IE_TTL(x) (*(x + 2))
46 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
47 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
48 #define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0);
49 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
50 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
51 #define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
52 #define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
53 #define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x));
56 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
57 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
58 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
59 #define PREP_IE_ORIG_ADDR(x) (x + 3)
60 #define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0);
61 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
62 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
63 #define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
64 #define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
66 #define PERR_IE_DST_ADDR(x) (x + 2)
67 #define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0);
69 #define MSEC_TO_TU(x) (x*1000/1024)
70 #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
71 #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0)
73 #define net_traversal_jiffies(s) \
74 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
75 #define default_lifetime(s) \
76 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
77 #define min_preq_int_jiff(s) \
78 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
79 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
80 #define disc_timeout_jiff(s) \
81 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
83 enum mpath_frame_type {
90 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
91 u8 *orig_addr, __le32 orig_dsn, u8 dst_flags, u8 *dst,
92 __le32 dst_dsn, u8 *da, u8 hop_count, u8 ttl, __le32 lifetime,
93 __le32 metric, __le32 preq_id, struct ieee80211_sub_if_data *sdata)
95 struct ieee80211_local *local = sdata->local;
96 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
97 struct ieee80211_mgmt *mgmt;
103 skb_reserve(skb, local->hw.extra_tx_headroom);
104 /* 25 is the size of the common mgmt part (24) plus the size of the
105 * common action part (1)
107 mgmt = (struct ieee80211_mgmt *)
108 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
109 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
110 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
111 IEEE80211_STYPE_ACTION);
113 memcpy(mgmt->da, da, ETH_ALEN);
114 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
116 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
117 mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
118 mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;
122 mhwmp_dbg("sending PREQ to %pM\n", dst);
124 pos = skb_put(skb, 2 + ie_len);
125 *pos++ = WLAN_EID_PREQ;
128 mhwmp_dbg("sending PREP to %pM\n", dst);
130 pos = skb_put(skb, 2 + ie_len);
131 *pos++ = WLAN_EID_PREP;
134 mhwmp_dbg("sending RANN from %pM\n", orig_addr);
135 ie_len = sizeof(struct ieee80211_rann_ie);
136 pos = skb_put(skb, 2 + ie_len);
137 *pos++ = WLAN_EID_RANN;
148 if (action == MPATH_PREQ) {
149 memcpy(pos, &preq_id, 4);
152 memcpy(pos, orig_addr, ETH_ALEN);
154 memcpy(pos, &orig_dsn, 4);
156 if (action != MPATH_RANN) {
157 memcpy(pos, &lifetime, 4);
160 memcpy(pos, &metric, 4);
162 if (action == MPATH_PREQ) {
163 /* destination count */
167 if (action != MPATH_RANN) {
168 memcpy(pos, dst, ETH_ALEN);
170 memcpy(pos, &dst_dsn, 4);
173 ieee80211_tx_skb(sdata, skb, 1);
178 * mesh_send_path error - Sends a PERR mesh management frame
180 * @dst: broken destination
181 * @dst_dsn: dsn of the broken destination
182 * @ra: node this frame is addressed to
184 int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra,
185 struct ieee80211_sub_if_data *sdata)
187 struct ieee80211_local *local = sdata->local;
188 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
189 struct ieee80211_mgmt *mgmt;
195 skb_reserve(skb, local->hw.extra_tx_headroom);
196 /* 25 is the size of the common mgmt part (24) plus the size of the
197 * common action part (1)
199 mgmt = (struct ieee80211_mgmt *)
200 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
201 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
202 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
203 IEEE80211_STYPE_ACTION);
205 memcpy(mgmt->da, ra, ETH_ALEN);
206 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
207 /* BSSID is left zeroed, wildcard value */
208 mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
209 mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;
211 pos = skb_put(skb, 2 + ie_len);
212 *pos++ = WLAN_EID_PERR;
214 /* mode flags, reserved */
216 /* number of destinations */
218 memcpy(pos, dst, ETH_ALEN);
220 memcpy(pos, &dst_dsn, 4);
222 ieee80211_tx_skb(sdata, skb, 1);
226 void ieee80211s_update_metric(struct ieee80211_local *local,
227 struct sta_info *stainfo, struct sk_buff *skb)
229 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
230 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
233 if (!ieee80211_is_data(hdr->frame_control))
236 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
238 /* moving average, scaled to 100 */
239 stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed);
240 if (stainfo->fail_avg > 95)
241 mesh_plink_broken(stainfo);
244 static u32 airtime_link_metric_get(struct ieee80211_local *local,
245 struct sta_info *sta)
247 struct ieee80211_supported_band *sband;
248 /* This should be adjusted for each device */
249 int device_constant = 1 << ARITH_SHIFT;
250 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
251 int s_unit = 1 << ARITH_SHIFT;
253 u32 tx_time, estimated_retx;
256 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
258 if (sta->fail_avg >= 100)
261 if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
264 err = (sta->fail_avg << ARITH_SHIFT) / 100;
266 /* bitrate is in units of 100 Kbps, while we need rate in units of
267 * 1Mbps. This will be corrected on tx_time computation.
269 rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
270 tx_time = (device_constant + 10 * test_frame_len / rate);
271 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
272 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
277 * hwmp_route_info_get - Update routing info to originator and transmitter
279 * @sdata: local mesh subif
280 * @mgmt: mesh management frame
281 * @hwmp_ie: hwmp information element (PREP or PREQ)
283 * This function updates the path routing information to the originator and the
284 * transmitter of a HWMP PREQ or PREP frame.
286 * Returns: metric to frame originator or 0 if the frame should not be further
289 * Notes: this function is the only place (besides user-provided info) where
290 * path routing information is updated.
292 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
293 struct ieee80211_mgmt *mgmt,
294 u8 *hwmp_ie, enum mpath_frame_type action)
296 struct ieee80211_local *local = sdata->local;
297 struct mesh_path *mpath;
298 struct sta_info *sta;
301 u32 orig_dsn, orig_metric;
302 unsigned long orig_lifetime, exp_time;
303 u32 last_hop_metric, new_metric;
307 sta = sta_info_get(local, mgmt->sa);
313 last_hop_metric = airtime_link_metric_get(local, sta);
314 /* Update and check originator routing info */
319 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
320 orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie);
321 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
322 orig_metric = PREQ_IE_METRIC(hwmp_ie);
325 /* Originator here refers to the MP that was the destination in
326 * the Path Request. The draft refers to that MP as the
327 * destination address, even though usually it is the origin of
328 * the PREP frame. We divert from the nomenclature in the draft
329 * so that we can easily use a single function to gather path
330 * information from both PREQ and PREP frames.
332 orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie);
333 orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie);
334 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
335 orig_metric = PREP_IE_METRIC(hwmp_ie);
341 new_metric = orig_metric + last_hop_metric;
342 if (new_metric < orig_metric)
343 new_metric = MAX_METRIC;
344 exp_time = TU_TO_EXP_TIME(orig_lifetime);
346 if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) {
347 /* This MP is the originator, we are not interested in this
348 * frame, except for updating transmitter's path info.
353 mpath = mesh_path_lookup(orig_addr, sdata);
355 spin_lock_bh(&mpath->state_lock);
356 if (mpath->flags & MESH_PATH_FIXED)
358 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
359 (mpath->flags & MESH_PATH_DSN_VALID)) {
360 if (DSN_GT(mpath->dsn, orig_dsn) ||
361 (mpath->dsn == orig_dsn &&
362 action == MPATH_PREQ &&
363 new_metric > mpath->metric)) {
369 mesh_path_add(orig_addr, sdata);
370 mpath = mesh_path_lookup(orig_addr, sdata);
375 spin_lock_bh(&mpath->state_lock);
379 mesh_path_assign_nexthop(mpath, sta);
380 mpath->flags |= MESH_PATH_DSN_VALID;
381 mpath->metric = new_metric;
382 mpath->dsn = orig_dsn;
383 mpath->exp_time = time_after(mpath->exp_time, exp_time)
384 ? mpath->exp_time : exp_time;
385 mesh_path_activate(mpath);
386 spin_unlock_bh(&mpath->state_lock);
387 mesh_path_tx_pending(mpath);
388 /* draft says preq_id should be saved to, but there does
389 * not seem to be any use for it, skipping by now
392 spin_unlock_bh(&mpath->state_lock);
395 /* Update and check transmitter routing info */
397 if (memcmp(orig_addr, ta, ETH_ALEN) == 0)
402 mpath = mesh_path_lookup(ta, sdata);
404 spin_lock_bh(&mpath->state_lock);
405 if ((mpath->flags & MESH_PATH_FIXED) ||
406 ((mpath->flags & MESH_PATH_ACTIVE) &&
407 (last_hop_metric > mpath->metric)))
410 mesh_path_add(ta, sdata);
411 mpath = mesh_path_lookup(ta, sdata);
416 spin_lock_bh(&mpath->state_lock);
420 mesh_path_assign_nexthop(mpath, sta);
421 mpath->flags &= ~MESH_PATH_DSN_VALID;
422 mpath->metric = last_hop_metric;
423 mpath->exp_time = time_after(mpath->exp_time, exp_time)
424 ? mpath->exp_time : exp_time;
425 mesh_path_activate(mpath);
426 spin_unlock_bh(&mpath->state_lock);
427 mesh_path_tx_pending(mpath);
429 spin_unlock_bh(&mpath->state_lock);
434 return process ? new_metric : 0;
437 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
438 struct ieee80211_mgmt *mgmt,
439 u8 *preq_elem, u32 metric)
441 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
442 struct mesh_path *mpath;
443 u8 *dst_addr, *orig_addr;
445 u32 orig_dsn, dst_dsn, lifetime;
449 /* Update destination DSN, if present */
450 dst_addr = PREQ_IE_DST_ADDR(preq_elem);
451 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
452 dst_dsn = PREQ_IE_DST_DSN(preq_elem);
453 orig_dsn = PREQ_IE_ORIG_DSN(preq_elem);
454 dst_flags = PREQ_IE_DST_F(preq_elem);
456 mhwmp_dbg("received PREQ from %pM\n", orig_addr);
458 if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) {
459 mhwmp_dbg("PREQ is for us\n");
463 if (time_after(jiffies, ifmsh->last_dsn_update +
464 net_traversal_jiffies(sdata)) ||
465 time_before(jiffies, ifmsh->last_dsn_update)) {
466 dst_dsn = ++ifmsh->dsn;
467 ifmsh->last_dsn_update = jiffies;
471 mpath = mesh_path_lookup(dst_addr, sdata);
473 if ((!(mpath->flags & MESH_PATH_DSN_VALID)) ||
474 DSN_LT(mpath->dsn, dst_dsn)) {
475 mpath->dsn = dst_dsn;
476 mpath->flags |= MESH_PATH_DSN_VALID;
477 } else if ((!(dst_flags & MP_F_DO)) &&
478 (mpath->flags & MESH_PATH_ACTIVE)) {
480 metric = mpath->metric;
481 dst_dsn = mpath->dsn;
482 if (dst_flags & MP_F_RF)
483 dst_flags |= MP_F_DO;
492 lifetime = PREQ_IE_LIFETIME(preq_elem);
493 ttl = ifmsh->mshcfg.dot11MeshTTL;
495 mhwmp_dbg("replying to the PREQ\n");
496 mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr,
497 cpu_to_le32(dst_dsn), 0, orig_addr,
498 cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl,
499 cpu_to_le32(lifetime), cpu_to_le32(metric),
502 ifmsh->mshstats.dropped_frames_ttl++;
509 ttl = PREQ_IE_TTL(preq_elem);
510 lifetime = PREQ_IE_LIFETIME(preq_elem);
512 ifmsh->mshstats.dropped_frames_ttl++;
515 mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr);
517 flags = PREQ_IE_FLAGS(preq_elem);
518 preq_id = PREQ_IE_PREQ_ID(preq_elem);
519 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
520 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
521 cpu_to_le32(orig_dsn), dst_flags, dst_addr,
522 cpu_to_le32(dst_dsn), sdata->dev->broadcast,
523 hopcount, ttl, cpu_to_le32(lifetime),
524 cpu_to_le32(metric), cpu_to_le32(preq_id),
526 ifmsh->mshstats.fwded_mcast++;
527 ifmsh->mshstats.fwded_frames++;
532 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
533 struct ieee80211_mgmt *mgmt,
534 u8 *prep_elem, u32 metric)
536 struct mesh_path *mpath;
537 u8 *dst_addr, *orig_addr;
538 u8 ttl, hopcount, flags;
539 u8 next_hop[ETH_ALEN];
540 u32 dst_dsn, orig_dsn, lifetime;
542 mhwmp_dbg("received PREP from %pM\n", PREP_IE_ORIG_ADDR(prep_elem));
544 /* Note that we divert from the draft nomenclature and denominate
545 * destination to what the draft refers to as origininator. So in this
546 * function destnation refers to the final destination of the PREP,
547 * which corresponds with the originator of the PREQ which this PREP
550 dst_addr = PREP_IE_DST_ADDR(prep_elem);
551 if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0)
552 /* destination, no forwarding required */
555 ttl = PREP_IE_TTL(prep_elem);
557 sdata->u.mesh.mshstats.dropped_frames_ttl++;
562 mpath = mesh_path_lookup(dst_addr, sdata);
564 spin_lock_bh(&mpath->state_lock);
567 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
568 spin_unlock_bh(&mpath->state_lock);
571 memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN);
572 spin_unlock_bh(&mpath->state_lock);
574 flags = PREP_IE_FLAGS(prep_elem);
575 lifetime = PREP_IE_LIFETIME(prep_elem);
576 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
577 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
578 dst_dsn = PREP_IE_DST_DSN(prep_elem);
579 orig_dsn = PREP_IE_ORIG_DSN(prep_elem);
581 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
582 cpu_to_le32(orig_dsn), 0, dst_addr,
583 cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl,
584 cpu_to_le32(lifetime), cpu_to_le32(metric),
588 sdata->u.mesh.mshstats.fwded_unicast++;
589 sdata->u.mesh.mshstats.fwded_frames++;
594 sdata->u.mesh.mshstats.dropped_frames_no_route++;
598 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
599 struct ieee80211_mgmt *mgmt, u8 *perr_elem)
601 struct mesh_path *mpath;
606 dst_addr = PERR_IE_DST_ADDR(perr_elem);
607 dst_dsn = PERR_IE_DST_DSN(perr_elem);
609 mpath = mesh_path_lookup(dst_addr, sdata);
611 spin_lock_bh(&mpath->state_lock);
612 if (mpath->flags & MESH_PATH_ACTIVE &&
613 memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 &&
614 (!(mpath->flags & MESH_PATH_DSN_VALID) ||
615 DSN_GT(dst_dsn, mpath->dsn))) {
616 mpath->flags &= ~MESH_PATH_ACTIVE;
617 mpath->dsn = dst_dsn;
618 spin_unlock_bh(&mpath->state_lock);
619 mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn),
620 sdata->dev->broadcast, sdata);
622 spin_unlock_bh(&mpath->state_lock);
627 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
628 struct ieee80211_mgmt *mgmt,
629 struct ieee80211_rann_ie *rann)
631 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
632 struct mesh_path *mpath;
634 u8 ttl, flags, hopcount;
636 u32 orig_dsn, metric;
639 ttl = rann->rann_ttl;
641 ifmsh->mshstats.dropped_frames_ttl++;
645 flags = rann->rann_flags;
646 orig_addr = rann->rann_addr;
647 orig_dsn = rann->rann_seq;
648 hopcount = rann->rann_hopcount;
649 metric = rann->rann_metric;
650 mhwmp_dbg("received RANN from %pM\n", orig_addr);
653 mpath = mesh_path_lookup(orig_addr, sdata);
655 mesh_path_add(orig_addr, sdata);
656 mpath = mesh_path_lookup(orig_addr, sdata);
659 sdata->u.mesh.mshstats.dropped_frames_no_route++;
662 mesh_queue_preq(mpath,
663 PREQ_Q_F_START | PREQ_Q_F_REFRESH);
665 if (mpath->dsn < orig_dsn) {
666 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
667 cpu_to_le32(orig_dsn),
668 0, NULL, 0, sdata->dev->broadcast,
669 hopcount, ttl, 0, cpu_to_le32(metric),
671 mpath->dsn = orig_dsn;
677 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
678 struct ieee80211_mgmt *mgmt,
681 struct ieee802_11_elems elems;
685 /* need action_code */
686 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
689 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
690 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
691 len - baselen, &elems);
694 if (elems.preq_len != 37)
695 /* Right now we support just 1 destination and no AE */
697 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
700 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
704 if (elems.prep_len != 31)
705 /* Right now we support no AE */
707 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
710 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
714 if (elems.perr_len != 12)
715 /* Right now we support only one destination per PERR */
717 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
720 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
724 * mesh_queue_preq - queue a PREQ to a given destination
726 * @mpath: mesh path to discover
727 * @flags: special attributes of the PREQ to be sent
729 * Locking: the function must be called from within a rcu read lock block.
732 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
734 struct ieee80211_sub_if_data *sdata = mpath->sdata;
735 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
736 struct mesh_preq_queue *preq_node;
738 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
740 mhwmp_dbg("could not allocate PREQ node\n");
744 spin_lock(&ifmsh->mesh_preq_queue_lock);
745 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
746 spin_unlock(&ifmsh->mesh_preq_queue_lock);
748 if (printk_ratelimit())
749 mhwmp_dbg("PREQ node queue full\n");
753 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
754 preq_node->flags = flags;
756 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
757 ++ifmsh->preq_queue_len;
758 spin_unlock(&ifmsh->mesh_preq_queue_lock);
760 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
761 ieee80211_queue_work(&sdata->local->hw, &ifmsh->work);
763 else if (time_before(jiffies, ifmsh->last_preq)) {
764 /* avoid long wait if did not send preqs for a long time
765 * and jiffies wrapped around
767 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
768 ieee80211_queue_work(&sdata->local->hw, &ifmsh->work);
770 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
771 min_preq_int_jiff(sdata));
775 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
777 * @sdata: local mesh subif
779 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
781 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
782 struct mesh_preq_queue *preq_node;
783 struct mesh_path *mpath;
787 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
788 if (!ifmsh->preq_queue_len ||
789 time_before(jiffies, ifmsh->last_preq +
790 min_preq_int_jiff(sdata))) {
791 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
795 preq_node = list_first_entry(&ifmsh->preq_queue.list,
796 struct mesh_preq_queue, list);
797 list_del(&preq_node->list);
798 --ifmsh->preq_queue_len;
799 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
802 mpath = mesh_path_lookup(preq_node->dst, sdata);
806 spin_lock_bh(&mpath->state_lock);
807 if (preq_node->flags & PREQ_Q_F_START) {
808 if (mpath->flags & MESH_PATH_RESOLVING) {
809 spin_unlock_bh(&mpath->state_lock);
812 mpath->flags &= ~MESH_PATH_RESOLVED;
813 mpath->flags |= MESH_PATH_RESOLVING;
814 mpath->discovery_retries = 0;
815 mpath->discovery_timeout = disc_timeout_jiff(sdata);
817 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
818 mpath->flags & MESH_PATH_RESOLVED) {
819 mpath->flags &= ~MESH_PATH_RESOLVING;
820 spin_unlock_bh(&mpath->state_lock);
824 ifmsh->last_preq = jiffies;
826 if (time_after(jiffies, ifmsh->last_dsn_update +
827 net_traversal_jiffies(sdata)) ||
828 time_before(jiffies, ifmsh->last_dsn_update)) {
830 sdata->u.mesh.last_dsn_update = jiffies;
832 lifetime = default_lifetime(sdata);
833 ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
835 sdata->u.mesh.mshstats.dropped_frames_ttl++;
836 spin_unlock_bh(&mpath->state_lock);
840 if (preq_node->flags & PREQ_Q_F_REFRESH)
845 spin_unlock_bh(&mpath->state_lock);
846 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr,
847 cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst,
848 cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0,
849 ttl, cpu_to_le32(lifetime), 0,
850 cpu_to_le32(ifmsh->preq_id++), sdata);
851 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
859 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
861 * @skb: 802.11 frame to be sent
862 * @sdata: network subif the frame will be sent through
864 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
865 * found, the function will start a path discovery and queue the frame so it is
866 * sent when the path is resolved. This means the caller must not free the skb
869 int mesh_nexthop_lookup(struct sk_buff *skb,
870 struct ieee80211_sub_if_data *sdata)
872 struct sk_buff *skb_to_free = NULL;
873 struct mesh_path *mpath;
874 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
875 u8 *dst_addr = hdr->addr3;
879 mpath = mesh_path_lookup(dst_addr, sdata);
882 mesh_path_add(dst_addr, sdata);
883 mpath = mesh_path_lookup(dst_addr, sdata);
885 sdata->u.mesh.mshstats.dropped_frames_no_route++;
891 if (mpath->flags & MESH_PATH_ACTIVE) {
892 if (time_after(jiffies, mpath->exp_time +
893 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time))
894 && !memcmp(sdata->dev->dev_addr, hdr->addr4,
896 && !(mpath->flags & MESH_PATH_RESOLVING)
897 && !(mpath->flags & MESH_PATH_FIXED)) {
898 mesh_queue_preq(mpath,
899 PREQ_Q_F_START | PREQ_Q_F_REFRESH);
901 memcpy(hdr->addr1, mpath->next_hop->sta.addr,
904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
905 if (!(mpath->flags & MESH_PATH_RESOLVING)) {
906 /* Start discovery only if it is not running yet */
907 mesh_queue_preq(mpath, PREQ_Q_F_START);
910 if (skb_queue_len(&mpath->frame_queue) >=
911 MESH_FRAME_QUEUE_LEN)
912 skb_to_free = skb_dequeue(&mpath->frame_queue);
914 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
915 skb_queue_tail(&mpath->frame_queue, skb);
917 mesh_path_discard_frame(skb_to_free, sdata);
926 void mesh_path_timer(unsigned long data)
928 struct ieee80211_sub_if_data *sdata;
929 struct mesh_path *mpath;
932 mpath = (struct mesh_path *) data;
933 mpath = rcu_dereference(mpath);
936 sdata = mpath->sdata;
938 if (sdata->local->quiescing) {
943 spin_lock_bh(&mpath->state_lock);
944 if (mpath->flags & MESH_PATH_RESOLVED ||
945 (!(mpath->flags & MESH_PATH_RESOLVING)))
946 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
947 else if (mpath->discovery_retries < max_preq_retries(sdata)) {
948 ++mpath->discovery_retries;
949 mpath->discovery_timeout *= 2;
950 mesh_queue_preq(mpath, 0);
953 mpath->exp_time = jiffies;
954 mesh_path_flush_pending(mpath);
957 spin_unlock_bh(&mpath->state_lock);