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 */
30 /* Unknown Sequence Number */
32 /* Reason code Present */
33 #define MP_F_RCODE 0x02
35 static void mesh_queue_preq(struct mesh_path *, u8);
37 static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
41 return get_unaligned_le32(preq_elem + offset);
44 static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae)
48 return get_unaligned_le16(preq_elem + offset);
51 /* HWMP IE processing macros */
53 #define AE_F_SET(x) (*x & AE_F)
54 #define PREQ_IE_FLAGS(x) (*(x))
55 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
56 #define PREQ_IE_TTL(x) (*(x + 2))
57 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
58 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
59 #define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0);
60 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x));
61 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x));
62 #define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
63 #define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
64 #define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x));
67 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
68 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
69 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
70 #define PREP_IE_ORIG_ADDR(x) (x + 3)
71 #define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0);
72 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x));
73 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x));
74 #define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
75 #define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x));
77 #define PERR_IE_TTL(x) (*(x))
78 #define PERR_IE_DST_FLAGS(x) (*(x + 2))
79 #define PERR_IE_DST_ADDR(x) (x + 3)
80 #define PERR_IE_DST_DSN(x) u32_field_get(x, 9, 0);
81 #define PERR_IE_DST_RCODE(x) u16_field_get(x, 13, 0);
83 #define MSEC_TO_TU(x) (x*1000/1024)
84 #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0)
85 #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0)
87 #define net_traversal_jiffies(s) \
88 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
89 #define default_lifetime(s) \
90 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
91 #define min_preq_int_jiff(s) \
92 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
93 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
94 #define disc_timeout_jiff(s) \
95 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
97 enum mpath_frame_type {
104 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
105 u8 *orig_addr, __le32 orig_dsn, u8 dst_flags, u8 *dst,
106 __le32 dst_dsn, u8 *da, u8 hop_count, u8 ttl, __le32 lifetime,
107 __le32 metric, __le32 preq_id, struct ieee80211_sub_if_data *sdata)
109 struct ieee80211_local *local = sdata->local;
110 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
111 struct ieee80211_mgmt *mgmt;
117 skb_reserve(skb, local->hw.extra_tx_headroom);
118 /* 25 is the size of the common mgmt part (24) plus the size of the
119 * common action part (1)
121 mgmt = (struct ieee80211_mgmt *)
122 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
123 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125 IEEE80211_STYPE_ACTION);
127 memcpy(mgmt->da, da, ETH_ALEN);
128 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
130 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
131 mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
132 mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;
136 mhwmp_dbg("sending PREQ to %pM\n", dst);
138 pos = skb_put(skb, 2 + ie_len);
139 *pos++ = WLAN_EID_PREQ;
142 mhwmp_dbg("sending PREP to %pM\n", dst);
144 pos = skb_put(skb, 2 + ie_len);
145 *pos++ = WLAN_EID_PREP;
148 mhwmp_dbg("sending RANN from %pM\n", orig_addr);
149 ie_len = sizeof(struct ieee80211_rann_ie);
150 pos = skb_put(skb, 2 + ie_len);
151 *pos++ = WLAN_EID_RANN;
162 if (action == MPATH_PREQ) {
163 memcpy(pos, &preq_id, 4);
166 memcpy(pos, orig_addr, ETH_ALEN);
168 memcpy(pos, &orig_dsn, 4);
170 if (action != MPATH_RANN) {
171 memcpy(pos, &lifetime, 4);
174 memcpy(pos, &metric, 4);
176 if (action == MPATH_PREQ) {
177 /* destination count */
181 if (action != MPATH_RANN) {
182 memcpy(pos, dst, ETH_ALEN);
184 memcpy(pos, &dst_dsn, 4);
187 ieee80211_tx_skb(sdata, skb, 1);
192 * mesh_send_path error - Sends a PERR mesh management frame
194 * @dst: broken destination
195 * @dst_dsn: dsn of the broken destination
196 * @ra: node this frame is addressed to
198 int mesh_path_error_tx(u8 ttl, u8 *dst, __le32 dst_dsn, __le16 dst_rcode,
199 u8 *ra, struct ieee80211_sub_if_data *sdata)
201 struct ieee80211_local *local = sdata->local;
202 struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
203 struct ieee80211_mgmt *mgmt;
209 skb_reserve(skb, local->hw.extra_tx_headroom);
210 /* 25 is the size of the common mgmt part (24) plus the size of the
211 * common action part (1)
213 mgmt = (struct ieee80211_mgmt *)
214 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
215 memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
216 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
217 IEEE80211_STYPE_ACTION);
219 memcpy(mgmt->da, ra, ETH_ALEN);
220 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
221 /* BSSID is left zeroed, wildcard value */
222 mgmt->u.action.category = MESH_PATH_SEL_CATEGORY;
223 mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION;
225 pos = skb_put(skb, 2 + ie_len);
226 *pos++ = WLAN_EID_PERR;
230 /* number of destinations */
233 * flags bit, bit 1 is unset if we know the sequence number and
234 * bit 2 is set if we have a reason code
242 memcpy(pos, dst, ETH_ALEN);
244 memcpy(pos, &dst_dsn, 4);
246 memcpy(pos, &dst_rcode, 2);
248 ieee80211_tx_skb(sdata, skb, 1);
252 void ieee80211s_update_metric(struct ieee80211_local *local,
253 struct sta_info *stainfo, struct sk_buff *skb)
255 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
259 if (!ieee80211_is_data(hdr->frame_control))
262 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
264 /* moving average, scaled to 100 */
265 stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed);
266 if (stainfo->fail_avg > 95)
267 mesh_plink_broken(stainfo);
270 static u32 airtime_link_metric_get(struct ieee80211_local *local,
271 struct sta_info *sta)
273 struct ieee80211_supported_band *sband;
274 /* This should be adjusted for each device */
275 int device_constant = 1 << ARITH_SHIFT;
276 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
277 int s_unit = 1 << ARITH_SHIFT;
279 u32 tx_time, estimated_retx;
282 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
284 if (sta->fail_avg >= 100)
287 if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
290 err = (sta->fail_avg << ARITH_SHIFT) / 100;
292 /* bitrate is in units of 100 Kbps, while we need rate in units of
293 * 1Mbps. This will be corrected on tx_time computation.
295 rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
296 tx_time = (device_constant + 10 * test_frame_len / rate);
297 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
298 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
303 * hwmp_route_info_get - Update routing info to originator and transmitter
305 * @sdata: local mesh subif
306 * @mgmt: mesh management frame
307 * @hwmp_ie: hwmp information element (PREP or PREQ)
309 * This function updates the path routing information to the originator and the
310 * transmitter of a HWMP PREQ or PREP frame.
312 * Returns: metric to frame originator or 0 if the frame should not be further
315 * Notes: this function is the only place (besides user-provided info) where
316 * path routing information is updated.
318 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
319 struct ieee80211_mgmt *mgmt,
320 u8 *hwmp_ie, enum mpath_frame_type action)
322 struct ieee80211_local *local = sdata->local;
323 struct mesh_path *mpath;
324 struct sta_info *sta;
327 u32 orig_dsn, orig_metric;
328 unsigned long orig_lifetime, exp_time;
329 u32 last_hop_metric, new_metric;
333 sta = sta_info_get(local, mgmt->sa);
339 last_hop_metric = airtime_link_metric_get(local, sta);
340 /* Update and check originator routing info */
345 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
346 orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie);
347 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
348 orig_metric = PREQ_IE_METRIC(hwmp_ie);
351 /* Originator here refers to the MP that was the destination in
352 * the Path Request. The draft refers to that MP as the
353 * destination address, even though usually it is the origin of
354 * the PREP frame. We divert from the nomenclature in the draft
355 * so that we can easily use a single function to gather path
356 * information from both PREQ and PREP frames.
358 orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie);
359 orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie);
360 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
361 orig_metric = PREP_IE_METRIC(hwmp_ie);
367 new_metric = orig_metric + last_hop_metric;
368 if (new_metric < orig_metric)
369 new_metric = MAX_METRIC;
370 exp_time = TU_TO_EXP_TIME(orig_lifetime);
372 if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) {
373 /* This MP is the originator, we are not interested in this
374 * frame, except for updating transmitter's path info.
379 mpath = mesh_path_lookup(orig_addr, sdata);
381 spin_lock_bh(&mpath->state_lock);
382 if (mpath->flags & MESH_PATH_FIXED)
384 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
385 (mpath->flags & MESH_PATH_DSN_VALID)) {
386 if (DSN_GT(mpath->dsn, orig_dsn) ||
387 (mpath->dsn == orig_dsn &&
388 action == MPATH_PREQ &&
389 new_metric > mpath->metric)) {
395 mesh_path_add(orig_addr, sdata);
396 mpath = mesh_path_lookup(orig_addr, sdata);
401 spin_lock_bh(&mpath->state_lock);
405 mesh_path_assign_nexthop(mpath, sta);
406 mpath->flags |= MESH_PATH_DSN_VALID;
407 mpath->metric = new_metric;
408 mpath->dsn = orig_dsn;
409 mpath->exp_time = time_after(mpath->exp_time, exp_time)
410 ? mpath->exp_time : exp_time;
411 mesh_path_activate(mpath);
412 spin_unlock_bh(&mpath->state_lock);
413 mesh_path_tx_pending(mpath);
414 /* draft says preq_id should be saved to, but there does
415 * not seem to be any use for it, skipping by now
418 spin_unlock_bh(&mpath->state_lock);
421 /* Update and check transmitter routing info */
423 if (memcmp(orig_addr, ta, ETH_ALEN) == 0)
428 mpath = mesh_path_lookup(ta, sdata);
430 spin_lock_bh(&mpath->state_lock);
431 if ((mpath->flags & MESH_PATH_FIXED) ||
432 ((mpath->flags & MESH_PATH_ACTIVE) &&
433 (last_hop_metric > mpath->metric)))
436 mesh_path_add(ta, sdata);
437 mpath = mesh_path_lookup(ta, sdata);
442 spin_lock_bh(&mpath->state_lock);
446 mesh_path_assign_nexthop(mpath, sta);
447 mpath->flags &= ~MESH_PATH_DSN_VALID;
448 mpath->metric = last_hop_metric;
449 mpath->exp_time = time_after(mpath->exp_time, exp_time)
450 ? mpath->exp_time : exp_time;
451 mesh_path_activate(mpath);
452 spin_unlock_bh(&mpath->state_lock);
453 mesh_path_tx_pending(mpath);
455 spin_unlock_bh(&mpath->state_lock);
460 return process ? new_metric : 0;
463 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
464 struct ieee80211_mgmt *mgmt,
465 u8 *preq_elem, u32 metric)
467 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
468 struct mesh_path *mpath;
469 u8 *dst_addr, *orig_addr;
471 u32 orig_dsn, dst_dsn, lifetime;
475 /* Update destination DSN, if present */
476 dst_addr = PREQ_IE_DST_ADDR(preq_elem);
477 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
478 dst_dsn = PREQ_IE_DST_DSN(preq_elem);
479 orig_dsn = PREQ_IE_ORIG_DSN(preq_elem);
480 dst_flags = PREQ_IE_DST_F(preq_elem);
482 mhwmp_dbg("received PREQ from %pM\n", orig_addr);
484 if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) {
485 mhwmp_dbg("PREQ is for us\n");
489 if (time_after(jiffies, ifmsh->last_dsn_update +
490 net_traversal_jiffies(sdata)) ||
491 time_before(jiffies, ifmsh->last_dsn_update)) {
492 dst_dsn = ++ifmsh->dsn;
493 ifmsh->last_dsn_update = jiffies;
497 mpath = mesh_path_lookup(dst_addr, sdata);
499 if ((!(mpath->flags & MESH_PATH_DSN_VALID)) ||
500 DSN_LT(mpath->dsn, dst_dsn)) {
501 mpath->dsn = dst_dsn;
502 mpath->flags |= MESH_PATH_DSN_VALID;
503 } else if ((!(dst_flags & MP_F_DO)) &&
504 (mpath->flags & MESH_PATH_ACTIVE)) {
506 metric = mpath->metric;
507 dst_dsn = mpath->dsn;
508 if (dst_flags & MP_F_RF)
509 dst_flags |= MP_F_DO;
518 lifetime = PREQ_IE_LIFETIME(preq_elem);
519 ttl = ifmsh->mshcfg.dot11MeshTTL;
521 mhwmp_dbg("replying to the PREQ\n");
522 mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr,
523 cpu_to_le32(dst_dsn), 0, orig_addr,
524 cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl,
525 cpu_to_le32(lifetime), cpu_to_le32(metric),
528 ifmsh->mshstats.dropped_frames_ttl++;
535 ttl = PREQ_IE_TTL(preq_elem);
536 lifetime = PREQ_IE_LIFETIME(preq_elem);
538 ifmsh->mshstats.dropped_frames_ttl++;
541 mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr);
543 flags = PREQ_IE_FLAGS(preq_elem);
544 preq_id = PREQ_IE_PREQ_ID(preq_elem);
545 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
546 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
547 cpu_to_le32(orig_dsn), dst_flags, dst_addr,
548 cpu_to_le32(dst_dsn), sdata->dev->broadcast,
549 hopcount, ttl, cpu_to_le32(lifetime),
550 cpu_to_le32(metric), cpu_to_le32(preq_id),
552 ifmsh->mshstats.fwded_mcast++;
553 ifmsh->mshstats.fwded_frames++;
558 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
559 struct ieee80211_mgmt *mgmt,
560 u8 *prep_elem, u32 metric)
562 struct mesh_path *mpath;
563 u8 *dst_addr, *orig_addr;
564 u8 ttl, hopcount, flags;
565 u8 next_hop[ETH_ALEN];
566 u32 dst_dsn, orig_dsn, lifetime;
568 mhwmp_dbg("received PREP from %pM\n", PREP_IE_ORIG_ADDR(prep_elem));
570 /* Note that we divert from the draft nomenclature and denominate
571 * destination to what the draft refers to as origininator. So in this
572 * function destnation refers to the final destination of the PREP,
573 * which corresponds with the originator of the PREQ which this PREP
576 dst_addr = PREP_IE_DST_ADDR(prep_elem);
577 if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0)
578 /* destination, no forwarding required */
581 ttl = PREP_IE_TTL(prep_elem);
583 sdata->u.mesh.mshstats.dropped_frames_ttl++;
588 mpath = mesh_path_lookup(dst_addr, sdata);
590 spin_lock_bh(&mpath->state_lock);
593 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
594 spin_unlock_bh(&mpath->state_lock);
597 memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN);
598 spin_unlock_bh(&mpath->state_lock);
600 flags = PREP_IE_FLAGS(prep_elem);
601 lifetime = PREP_IE_LIFETIME(prep_elem);
602 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
603 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
604 dst_dsn = PREP_IE_DST_DSN(prep_elem);
605 orig_dsn = PREP_IE_ORIG_DSN(prep_elem);
607 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
608 cpu_to_le32(orig_dsn), 0, dst_addr,
609 cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl,
610 cpu_to_le32(lifetime), cpu_to_le32(metric),
614 sdata->u.mesh.mshstats.fwded_unicast++;
615 sdata->u.mesh.mshstats.fwded_frames++;
620 sdata->u.mesh.mshstats.dropped_frames_no_route++;
624 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
625 struct ieee80211_mgmt *mgmt, u8 *perr_elem)
627 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
628 struct mesh_path *mpath;
636 ttl = PERR_IE_TTL(perr_elem);
638 ifmsh->mshstats.dropped_frames_ttl++;
642 dst_flags = PERR_IE_DST_FLAGS(perr_elem);
643 dst_addr = PERR_IE_DST_ADDR(perr_elem);
644 dst_dsn = PERR_IE_DST_DSN(perr_elem);
645 dst_rcode = PERR_IE_DST_RCODE(perr_elem);
648 mpath = mesh_path_lookup(dst_addr, sdata);
650 spin_lock_bh(&mpath->state_lock);
651 if (mpath->flags & MESH_PATH_ACTIVE &&
652 memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 &&
653 (!(mpath->flags & MESH_PATH_DSN_VALID) ||
654 DSN_GT(dst_dsn, mpath->dsn))) {
655 mpath->flags &= ~MESH_PATH_ACTIVE;
656 mpath->dsn = dst_dsn;
657 spin_unlock_bh(&mpath->state_lock);
658 mesh_path_error_tx(ttl, dst_addr, cpu_to_le32(dst_dsn),
659 cpu_to_le16(dst_rcode),
660 sdata->dev->broadcast, sdata);
662 spin_unlock_bh(&mpath->state_lock);
667 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
668 struct ieee80211_mgmt *mgmt,
669 struct ieee80211_rann_ie *rann)
671 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
672 struct mesh_path *mpath;
674 u8 ttl, flags, hopcount;
676 u32 orig_dsn, metric;
679 ttl = rann->rann_ttl;
681 ifmsh->mshstats.dropped_frames_ttl++;
685 flags = rann->rann_flags;
686 orig_addr = rann->rann_addr;
687 orig_dsn = rann->rann_seq;
688 hopcount = rann->rann_hopcount;
690 metric = rann->rann_metric;
691 mhwmp_dbg("received RANN from %pM\n", orig_addr);
694 mpath = mesh_path_lookup(orig_addr, sdata);
696 mesh_path_add(orig_addr, sdata);
697 mpath = mesh_path_lookup(orig_addr, sdata);
700 sdata->u.mesh.mshstats.dropped_frames_no_route++;
703 mesh_queue_preq(mpath,
704 PREQ_Q_F_START | PREQ_Q_F_REFRESH);
706 if (mpath->dsn < orig_dsn) {
707 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
708 cpu_to_le32(orig_dsn),
709 0, NULL, 0, sdata->dev->broadcast,
711 cpu_to_le32(metric + mpath->metric),
713 mpath->dsn = orig_dsn;
719 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
720 struct ieee80211_mgmt *mgmt,
723 struct ieee802_11_elems elems;
727 /* need action_code */
728 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
731 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
732 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
733 len - baselen, &elems);
736 if (elems.preq_len != 37)
737 /* Right now we support just 1 destination and no AE */
739 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
742 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
746 if (elems.prep_len != 31)
747 /* Right now we support no AE */
749 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
752 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
756 if (elems.perr_len != 15)
757 /* Right now we support only one destination per PERR */
759 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
762 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
766 * mesh_queue_preq - queue a PREQ to a given destination
768 * @mpath: mesh path to discover
769 * @flags: special attributes of the PREQ to be sent
771 * Locking: the function must be called from within a rcu read lock block.
774 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
776 struct ieee80211_sub_if_data *sdata = mpath->sdata;
777 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
778 struct mesh_preq_queue *preq_node;
780 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
782 mhwmp_dbg("could not allocate PREQ node\n");
786 spin_lock(&ifmsh->mesh_preq_queue_lock);
787 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
788 spin_unlock(&ifmsh->mesh_preq_queue_lock);
790 if (printk_ratelimit())
791 mhwmp_dbg("PREQ node queue full\n");
795 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
796 preq_node->flags = flags;
798 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
799 ++ifmsh->preq_queue_len;
800 spin_unlock(&ifmsh->mesh_preq_queue_lock);
802 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
803 ieee80211_queue_work(&sdata->local->hw, &ifmsh->work);
805 else if (time_before(jiffies, ifmsh->last_preq)) {
806 /* avoid long wait if did not send preqs for a long time
807 * and jiffies wrapped around
809 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
810 ieee80211_queue_work(&sdata->local->hw, &ifmsh->work);
812 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
813 min_preq_int_jiff(sdata));
817 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
819 * @sdata: local mesh subif
821 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
823 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
824 struct mesh_preq_queue *preq_node;
825 struct mesh_path *mpath;
829 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
830 if (!ifmsh->preq_queue_len ||
831 time_before(jiffies, ifmsh->last_preq +
832 min_preq_int_jiff(sdata))) {
833 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
837 preq_node = list_first_entry(&ifmsh->preq_queue.list,
838 struct mesh_preq_queue, list);
839 list_del(&preq_node->list);
840 --ifmsh->preq_queue_len;
841 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
844 mpath = mesh_path_lookup(preq_node->dst, sdata);
848 spin_lock_bh(&mpath->state_lock);
849 if (preq_node->flags & PREQ_Q_F_START) {
850 if (mpath->flags & MESH_PATH_RESOLVING) {
851 spin_unlock_bh(&mpath->state_lock);
854 mpath->flags &= ~MESH_PATH_RESOLVED;
855 mpath->flags |= MESH_PATH_RESOLVING;
856 mpath->discovery_retries = 0;
857 mpath->discovery_timeout = disc_timeout_jiff(sdata);
859 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
860 mpath->flags & MESH_PATH_RESOLVED) {
861 mpath->flags &= ~MESH_PATH_RESOLVING;
862 spin_unlock_bh(&mpath->state_lock);
866 ifmsh->last_preq = jiffies;
868 if (time_after(jiffies, ifmsh->last_dsn_update +
869 net_traversal_jiffies(sdata)) ||
870 time_before(jiffies, ifmsh->last_dsn_update)) {
872 sdata->u.mesh.last_dsn_update = jiffies;
874 lifetime = default_lifetime(sdata);
875 ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
877 sdata->u.mesh.mshstats.dropped_frames_ttl++;
878 spin_unlock_bh(&mpath->state_lock);
882 if (preq_node->flags & PREQ_Q_F_REFRESH)
887 spin_unlock_bh(&mpath->state_lock);
888 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr,
889 cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst,
890 cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0,
891 ttl, cpu_to_le32(lifetime), 0,
892 cpu_to_le32(ifmsh->preq_id++), sdata);
893 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
901 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
903 * @skb: 802.11 frame to be sent
904 * @sdata: network subif the frame will be sent through
906 * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
907 * found, the function will start a path discovery and queue the frame so it is
908 * sent when the path is resolved. This means the caller must not free the skb
911 int mesh_nexthop_lookup(struct sk_buff *skb,
912 struct ieee80211_sub_if_data *sdata)
914 struct sk_buff *skb_to_free = NULL;
915 struct mesh_path *mpath;
916 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
917 u8 *dst_addr = hdr->addr3;
921 mpath = mesh_path_lookup(dst_addr, sdata);
924 mesh_path_add(dst_addr, sdata);
925 mpath = mesh_path_lookup(dst_addr, sdata);
927 sdata->u.mesh.mshstats.dropped_frames_no_route++;
933 if (mpath->flags & MESH_PATH_ACTIVE) {
934 if (time_after(jiffies, mpath->exp_time +
935 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time))
936 && !memcmp(sdata->dev->dev_addr, hdr->addr4,
938 && !(mpath->flags & MESH_PATH_RESOLVING)
939 && !(mpath->flags & MESH_PATH_FIXED)) {
940 mesh_queue_preq(mpath,
941 PREQ_Q_F_START | PREQ_Q_F_REFRESH);
943 memcpy(hdr->addr1, mpath->next_hop->sta.addr,
946 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
947 if (!(mpath->flags & MESH_PATH_RESOLVING)) {
948 /* Start discovery only if it is not running yet */
949 mesh_queue_preq(mpath, PREQ_Q_F_START);
952 if (skb_queue_len(&mpath->frame_queue) >=
953 MESH_FRAME_QUEUE_LEN)
954 skb_to_free = skb_dequeue(&mpath->frame_queue);
956 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
957 skb_queue_tail(&mpath->frame_queue, skb);
959 mesh_path_discard_frame(skb_to_free, sdata);
968 void mesh_path_timer(unsigned long data)
970 struct ieee80211_sub_if_data *sdata;
971 struct mesh_path *mpath;
974 mpath = (struct mesh_path *) data;
975 mpath = rcu_dereference(mpath);
978 sdata = mpath->sdata;
980 if (sdata->local->quiescing) {
985 spin_lock_bh(&mpath->state_lock);
986 if (mpath->flags & MESH_PATH_RESOLVED ||
987 (!(mpath->flags & MESH_PATH_RESOLVING)))
988 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
989 else if (mpath->discovery_retries < max_preq_retries(sdata)) {
990 ++mpath->discovery_retries;
991 mpath->discovery_timeout *= 2;
992 mesh_queue_preq(mpath, 0);
995 mpath->exp_time = jiffies;
996 mesh_path_flush_pending(mpath);
999 spin_unlock_bh(&mpath->state_lock);