?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / net / mac80211 / mesh_hwmp.c
blob94758b9c9ed48a5d1ea9921f4f9f0da40e34bd0b
1 /*
2 * Copyright (c) 2008, 2009 open80211s Ltd.
3 * Author: Luis Carlos Cobo <luisca@cozybit.com>
4 *
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.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/etherdevice.h>
12 #include <asm/unaligned.h>
13 #include "wme.h"
14 #include "mesh.h"
15
16 #define TEST_FRAME_LEN 8192
17 #define MAX_METRIC 0xffffffff
18 #define ARITH_SHIFT 8
19
20 #define MAX_PREQ_QUEUE_LEN 64
21
22 /* Destination only */
23 #define MP_F_DO 0x1
24 /* Reply and forward */
25 #define MP_F_RF 0x2
26 /* Unknown Sequence Number */
27 #define MP_F_USN 0x01
28 /* Reason code Present */
29 #define MP_F_RCODE 0x02
30
31 static void mesh_queue_preq(struct mesh_path *, u8);
32
33 static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae)
34 {
35 if (ae)
36 offset += 6;
37 return get_unaligned_le32(preq_elem + offset);
38 }
39
40 static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae)
41 {
42 if (ae)
43 offset += 6;
44 return get_unaligned_le16(preq_elem + offset);
45 }
46
47 /* HWMP IE processing macros */
48 #define AE_F (1<<6)
49 #define AE_F_SET(x) (*x & AE_F)
50 #define PREQ_IE_FLAGS(x) (*(x))
51 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
52 #define PREQ_IE_TTL(x) (*(x + 2))
53 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
54 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
55 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
56 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
57 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
58 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
59 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
60 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
61
62
63 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
64 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
65 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
66 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
67 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
68 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
69 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
70 #define PREP_IE_TARGET_ADDR(x) (x + 3)
71 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
72
73 #define PERR_IE_TTL(x) (*(x))
74 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
75 #define PERR_IE_TARGET_ADDR(x) (x + 3)
76 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
77 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
78
79 #define MSEC_TO_TU(x) (x*1000/1024)
80 #define SN_GT(x, y) ((s32)(y - x) < 0)
81 #define SN_LT(x, y) ((s32)(x - y) < 0)
82
83 #define net_traversal_jiffies(s) \
84 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
85 #define default_lifetime(s) \
86 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
87 #define min_preq_int_jiff(s) \
88 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
89 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
90 #define disc_timeout_jiff(s) \
91 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
92 #define root_path_confirmation_jiffies(s) \
93 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
94
95 enum mpath_frame_type {
96 MPATH_PREQ = 0,
97 MPATH_PREP,
98 MPATH_PERR,
99 MPATH_RANN
100 };
101
102 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
103
104 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
105 const u8 *orig_addr, u32 orig_sn,
106 u8 target_flags, const u8 *target,
107 u32 target_sn, const u8 *da,
108 u8 hop_count, u8 ttl,
109 u32 lifetime, u32 metric, u32 preq_id,
110 struct ieee80211_sub_if_data *sdata)
111 {
112 struct ieee80211_local *local = sdata->local;
113 struct sk_buff *skb;
114 struct ieee80211_mgmt *mgmt;
115 u8 *pos, ie_len;
116 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
117 sizeof(mgmt->u.action.u.mesh_action);
118
119 skb = dev_alloc_skb(local->tx_headroom +
120 hdr_len +
121 2 + 37); /* max HWMP IE */
122 if (!skb)
123 return -1;
124 skb_reserve(skb, local->tx_headroom);
125 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
126 memset(mgmt, 0, hdr_len);
127 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
128 IEEE80211_STYPE_ACTION);
129
130 memcpy(mgmt->da, da, ETH_ALEN);
131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
132 /* BSSID == SA */
133 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
134 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
135 mgmt->u.action.u.mesh_action.action_code =
136 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
137
138 switch (action) {
139 case MPATH_PREQ:
140 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
141 ie_len = 37;
142 pos = skb_put(skb, 2 + ie_len);
143 *pos++ = WLAN_EID_PREQ;
144 break;
145 case MPATH_PREP:
146 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr);
147 ie_len = 31;
148 pos = skb_put(skb, 2 + ie_len);
149 *pos++ = WLAN_EID_PREP;
150 break;
151 case MPATH_RANN:
152 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
153 ie_len = sizeof(struct ieee80211_rann_ie);
154 pos = skb_put(skb, 2 + ie_len);
155 *pos++ = WLAN_EID_RANN;
156 break;
157 default:
158 kfree_skb(skb);
159 return -ENOTSUPP;
160 break;
161 }
162 *pos++ = ie_len;
163 *pos++ = flags;
164 *pos++ = hop_count;
165 *pos++ = ttl;
166 if (action == MPATH_PREP) {
167 memcpy(pos, target, ETH_ALEN);
168 pos += ETH_ALEN;
169 put_unaligned_le32(target_sn, pos);
170 pos += 4;
171 } else {
172 if (action == MPATH_PREQ) {
173 put_unaligned_le32(preq_id, pos);
174 pos += 4;
175 }
176 memcpy(pos, orig_addr, ETH_ALEN);
177 pos += ETH_ALEN;
178 put_unaligned_le32(orig_sn, pos);
179 pos += 4;
180 }
181 put_unaligned_le32(lifetime, pos); /* interval for RANN */
182 pos += 4;
183 put_unaligned_le32(metric, pos);
184 pos += 4;
185 if (action == MPATH_PREQ) {
186 *pos++ = 1; /* destination count */
187 *pos++ = target_flags;
188 memcpy(pos, target, ETH_ALEN);
189 pos += ETH_ALEN;
190 put_unaligned_le32(target_sn, pos);
191 pos += 4;
192 } else if (action == MPATH_PREP) {
193 memcpy(pos, orig_addr, ETH_ALEN);
194 pos += ETH_ALEN;
195 put_unaligned_le32(orig_sn, pos);
196 pos += 4;
197 }
198
199 ieee80211_tx_skb(sdata, skb);
200 return 0;
201 }
202
203
204 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
205 * headroom in case the frame is encrypted. */
206 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
207 struct sk_buff *skb)
208 {
209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
210 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
211
212 skb_set_mac_header(skb, 0);
213 skb_set_network_header(skb, 0);
214 skb_set_transport_header(skb, 0);
215
216 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
217 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
218 skb->priority = 7;
219
220 info->control.vif = &sdata->vif;
221 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
222 ieee80211_set_qos_hdr(sdata, skb);
223 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
224 }
225
226 /**
227 * mesh_path_error_tx - Sends a PERR mesh management frame
228 *
229 * @ttl: allowed remaining hops
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
234 * @sdata: local mesh subif
235 *
236 * Note: This function may be called with driver locks taken that the driver
237 * also acquires in the TX path. To avoid a deadlock we don't transmit the
238 * frame directly but add it to the pending queue instead.
239 */
240 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
241 u8 ttl, const u8 *target, u32 target_sn,
242 u16 target_rcode, const u8 *ra)
243 {
244 struct ieee80211_local *local = sdata->local;
245 struct sk_buff *skb;
246 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
247 struct ieee80211_mgmt *mgmt;
248 u8 *pos, ie_len;
249 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
250 sizeof(mgmt->u.action.u.mesh_action);
251
252 if (time_before(jiffies, ifmsh->next_perr))
253 return -EAGAIN;
254
255 skb = dev_alloc_skb(local->tx_headroom +
256 sdata->encrypt_headroom +
257 IEEE80211_ENCRYPT_TAILROOM +
258 hdr_len +
259 2 + 15 /* PERR IE */);
260 if (!skb)
261 return -1;
262 skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom);
263 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
264 memset(mgmt, 0, hdr_len);
265 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
266 IEEE80211_STYPE_ACTION);
267
268 memcpy(mgmt->da, ra, ETH_ALEN);
269 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
270 /* BSSID == SA */
271 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
272 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
273 mgmt->u.action.u.mesh_action.action_code =
274 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
275 ie_len = 15;
276 pos = skb_put(skb, 2 + ie_len);
277 *pos++ = WLAN_EID_PERR;
278 *pos++ = ie_len;
279 /* ttl */
280 *pos++ = ttl;
281 /* number of destinations */
282 *pos++ = 1;
283 /*
284 * flags bit, bit 1 is unset if we know the sequence number and
285 * bit 2 is set if we have a reason code
286 */
287 *pos = 0;
288 if (!target_sn)
289 *pos |= MP_F_USN;
290 if (target_rcode)
291 *pos |= MP_F_RCODE;
292 pos++;
293 memcpy(pos, target, ETH_ALEN);
294 pos += ETH_ALEN;
295 put_unaligned_le32(target_sn, pos);
296 pos += 4;
297 put_unaligned_le16(target_rcode, pos);
298
299 /* see note in function header */
300 prepare_frame_for_deferred_tx(sdata, skb);
301 ifmsh->next_perr = TU_TO_EXP_TIME(
302 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
303 ieee80211_add_pending_skb(local, skb);
304 return 0;
305 }
306
307 void ieee80211s_update_metric(struct ieee80211_local *local,
308 struct sta_info *sta, struct sk_buff *skb)
309 {
310 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
311 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
312 int failed;
313
314 if (!ieee80211_is_data(hdr->frame_control))
315 return;
316
317 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
318
319 /* moving average, scaled to 100 */
320 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed);
321 if (sta->fail_avg > 95)
322 mesh_plink_broken(sta);
323 }
324
325 static u32 airtime_link_metric_get(struct ieee80211_local *local,
326 struct sta_info *sta)
327 {
328 struct rate_info rinfo;
329 /* This should be adjusted for each device */
330 int device_constant = 1 << ARITH_SHIFT;
331 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
332 int s_unit = 1 << ARITH_SHIFT;
333 int rate, err;
334 u32 tx_time, estimated_retx;
335 u64 result;
336
337 if (sta->fail_avg >= 100)
338 return MAX_METRIC;
339
340 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
341 rate = cfg80211_calculate_bitrate(&rinfo);
342 if (WARN_ON(!rate))
343 return MAX_METRIC;
344
345 err = (sta->fail_avg << ARITH_SHIFT) / 100;
346
347 /* bitrate is in units of 100 Kbps, while we need rate in units of
348 * 1Mbps. This will be corrected on tx_time computation.
349 */
350 tx_time = (device_constant + 10 * test_frame_len / rate);
351 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
352 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
353 return (u32)result;
354 }
355
356 /**
357 * hwmp_route_info_get - Update routing info to originator and transmitter
358 *
359 * @sdata: local mesh subif
360 * @mgmt: mesh management frame
361 * @hwmp_ie: hwmp information element (PREP or PREQ)
362 * @action: type of hwmp ie
363 *
364 * This function updates the path routing information to the originator and the
365 * transmitter of a HWMP PREQ or PREP frame.
366 *
367 * Returns: metric to frame originator or 0 if the frame should not be further
368 * processed
369 *
370 * Notes: this function is the only place (besides user-provided info) where
371 * path routing information is updated.
372 */
373 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
374 struct ieee80211_mgmt *mgmt,
375 const u8 *hwmp_ie, enum mpath_frame_type action)
376 {
377 struct ieee80211_local *local = sdata->local;
378 struct mesh_path *mpath;
379 struct sta_info *sta;
380 bool fresh_info;
381 const u8 *orig_addr, *ta;
382 u32 orig_sn, orig_metric;
383 unsigned long orig_lifetime, exp_time;
384 u32 last_hop_metric, new_metric;
385 bool process = true;
386
387 rcu_read_lock();
388 sta = sta_info_get(sdata, mgmt->sa);
389 if (!sta) {
390 rcu_read_unlock();
391 return 0;
392 }
393
394 last_hop_metric = airtime_link_metric_get(local, sta);
395 /* Update and check originator routing info */
396 fresh_info = true;
397
398 switch (action) {
399 case MPATH_PREQ:
400 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
401 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
402 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
403 orig_metric = PREQ_IE_METRIC(hwmp_ie);
404 break;
405 case MPATH_PREP:
406 /* Originator here refers to the MP that was the target in the
407 * Path Request. We divert from the nomenclature in the draft
408 * so that we can easily use a single function to gather path
409 * information from both PREQ and PREP frames.
410 */
411 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
412 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
413 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
414 orig_metric = PREP_IE_METRIC(hwmp_ie);
415 break;
416 default:
417 rcu_read_unlock();
418 return 0;
419 }
420 new_metric = orig_metric + last_hop_metric;
421 if (new_metric < orig_metric)
422 new_metric = MAX_METRIC;
423 exp_time = TU_TO_EXP_TIME(orig_lifetime);
424
425 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
426 /* This MP is the originator, we are not interested in this
427 * frame, except for updating transmitter's path info.
428 */
429 process = false;
430 fresh_info = false;
431 } else {
432 mpath = mesh_path_lookup(sdata, orig_addr);
433 if (mpath) {
434 spin_lock_bh(&mpath->state_lock);
435 if (mpath->flags & MESH_PATH_FIXED)
436 fresh_info = false;
437 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
438 (mpath->flags & MESH_PATH_SN_VALID)) {
439 if (SN_GT(mpath->sn, orig_sn) ||
440 (mpath->sn == orig_sn &&
441 new_metric >= mpath->metric)) {
442 process = false;
443 fresh_info = false;
444 }
445 }
446 } else {
447 mpath = mesh_path_add(sdata, orig_addr);
448 if (IS_ERR(mpath)) {
449 rcu_read_unlock();
450 return 0;
451 }
452 spin_lock_bh(&mpath->state_lock);
453 }
454
455 if (fresh_info) {
456 mesh_path_assign_nexthop(mpath, sta);
457 mpath->flags |= MESH_PATH_SN_VALID;
458 mpath->metric = new_metric;
459 mpath->sn = orig_sn;
460 mpath->exp_time = time_after(mpath->exp_time, exp_time)
461 ? mpath->exp_time : exp_time;
462 mesh_path_activate(mpath);
463 spin_unlock_bh(&mpath->state_lock);
464 mesh_path_tx_pending(mpath);
465 /* draft says preq_id should be saved to, but there does
466 * not seem to be any use for it, skipping by now
467 */
468 } else
469 spin_unlock_bh(&mpath->state_lock);
470 }
471
472 /* Update and check transmitter routing info */
473 ta = mgmt->sa;
474 if (ether_addr_equal(orig_addr, ta))
475 fresh_info = false;
476 else {
477 fresh_info = true;
478
479 mpath = mesh_path_lookup(sdata, ta);
480 if (mpath) {
481 spin_lock_bh(&mpath->state_lock);
482 if ((mpath->flags & MESH_PATH_FIXED) ||
483 ((mpath->flags & MESH_PATH_ACTIVE) &&
484 (last_hop_metric > mpath->metric)))
485 fresh_info = false;
486 } else {
487 mpath = mesh_path_add(sdata, ta);
488 if (IS_ERR(mpath)) {
489 rcu_read_unlock();
490 return 0;
491 }
492 spin_lock_bh(&mpath->state_lock);
493 }
494
495 if (fresh_info) {
496 mesh_path_assign_nexthop(mpath, sta);
497 mpath->metric = last_hop_metric;
498 mpath->exp_time = time_after(mpath->exp_time, exp_time)
499 ? mpath->exp_time : exp_time;
500 mesh_path_activate(mpath);
501 spin_unlock_bh(&mpath->state_lock);
502 mesh_path_tx_pending(mpath);
503 } else
504 spin_unlock_bh(&mpath->state_lock);
505 }
506
507 rcu_read_unlock();
508
509 return process ? new_metric : 0;
510 }
511
512 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
513 struct ieee80211_mgmt *mgmt,
514 const u8 *preq_elem, u32 metric)
515 {
516 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
517 struct mesh_path *mpath = NULL;
518 const u8 *target_addr, *orig_addr;
519 const u8 *da;
520 u8 target_flags, ttl, flags;
521 u32 orig_sn, target_sn, lifetime, orig_metric;
522 bool reply = false;
523 bool forward = true;
524 bool root_is_gate;
525
526 /* Update target SN, if present */
527 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
528 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
529 target_sn = PREQ_IE_TARGET_SN(preq_elem);
530 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
531 target_flags = PREQ_IE_TARGET_F(preq_elem);
532 orig_metric = metric;
533 /* Proactive PREQ gate announcements */
534 flags = PREQ_IE_FLAGS(preq_elem);
535 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
536
537 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
538
539 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
540 mhwmp_dbg(sdata, "PREQ is for us\n");
541 forward = false;
542 reply = true;
543 metric = 0;
544 if (time_after(jiffies, ifmsh->last_sn_update +
545 net_traversal_jiffies(sdata)) ||
546 time_before(jiffies, ifmsh->last_sn_update)) {
547 ++ifmsh->sn;
548 ifmsh->last_sn_update = jiffies;
549 }
550 target_sn = ifmsh->sn;
551 } else if (is_broadcast_ether_addr(target_addr) &&
552 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
553 rcu_read_lock();
554 mpath = mesh_path_lookup(sdata, orig_addr);
555 if (mpath) {
556 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
557 reply = true;
558 target_addr = sdata->vif.addr;
559 target_sn = ++ifmsh->sn;
560 metric = 0;
561 ifmsh->last_sn_update = jiffies;
562 }
563 if (root_is_gate)
564 mesh_path_add_gate(mpath);
565 }
566 rcu_read_unlock();
567 } else {
568 rcu_read_lock();
569 mpath = mesh_path_lookup(sdata, target_addr);
570 if (mpath) {
571 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
572 SN_LT(mpath->sn, target_sn)) {
573 mpath->sn = target_sn;
574 mpath->flags |= MESH_PATH_SN_VALID;
575 } else if ((!(target_flags & MP_F_DO)) &&
576 (mpath->flags & MESH_PATH_ACTIVE)) {
577 reply = true;
578 metric = mpath->metric;
579 target_sn = mpath->sn;
580 if (target_flags & MP_F_RF)
581 target_flags |= MP_F_DO;
582 else
583 forward = false;
584 }
585 }
586 rcu_read_unlock();
587 }
588
589 if (reply) {
590 lifetime = PREQ_IE_LIFETIME(preq_elem);
591 ttl = ifmsh->mshcfg.element_ttl;
592 if (ttl != 0) {
593 mhwmp_dbg(sdata, "replying to the PREQ\n");
594 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
595 orig_sn, 0, target_addr,
596 target_sn, mgmt->sa, 0, ttl,
597 lifetime, metric, 0, sdata);
598 } else {
599 ifmsh->mshstats.dropped_frames_ttl++;
600 }
601 }
602
603 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
604 u32 preq_id;
605 u8 hopcount;
606
607 ttl = PREQ_IE_TTL(preq_elem);
608 lifetime = PREQ_IE_LIFETIME(preq_elem);
609 if (ttl <= 1) {
610 ifmsh->mshstats.dropped_frames_ttl++;
611 return;
612 }
613 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
614 --ttl;
615 preq_id = PREQ_IE_PREQ_ID(preq_elem);
616 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
617 da = (mpath && mpath->is_root) ?
618 mpath->rann_snd_addr : broadcast_addr;
619
620 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
621 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
622 target_sn = PREQ_IE_TARGET_SN(preq_elem);
623 metric = orig_metric;
624 }
625
626 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
627 orig_sn, target_flags, target_addr,
628 target_sn, da, hopcount, ttl, lifetime,
629 metric, preq_id, sdata);
630 if (!is_multicast_ether_addr(da))
631 ifmsh->mshstats.fwded_unicast++;
632 else
633 ifmsh->mshstats.fwded_mcast++;
634 ifmsh->mshstats.fwded_frames++;
635 }
636 }
637
638
639 static inline struct sta_info *
640 next_hop_deref_protected(struct mesh_path *mpath)
641 {
642 return rcu_dereference_protected(mpath->next_hop,
643 lockdep_is_held(&mpath->state_lock));
644 }
645
646
647 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
648 struct ieee80211_mgmt *mgmt,
649 const u8 *prep_elem, u32 metric)
650 {
651 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
652 struct mesh_path *mpath;
653 const u8 *target_addr, *orig_addr;
654 u8 ttl, hopcount, flags;
655 u8 next_hop[ETH_ALEN];
656 u32 target_sn, orig_sn, lifetime;
657
658 mhwmp_dbg(sdata, "received PREP from %pM\n",
659 PREP_IE_TARGET_ADDR(prep_elem));
660
661 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
662 if (ether_addr_equal(orig_addr, sdata->vif.addr))
663 /* destination, no forwarding required */
664 return;
665
666 if (!ifmsh->mshcfg.dot11MeshForwarding)
667 return;
668
669 ttl = PREP_IE_TTL(prep_elem);
670 if (ttl <= 1) {
671 sdata->u.mesh.mshstats.dropped_frames_ttl++;
672 return;
673 }
674
675 rcu_read_lock();
676 mpath = mesh_path_lookup(sdata, orig_addr);
677 if (mpath)
678 spin_lock_bh(&mpath->state_lock);
679 else
680 goto fail;
681 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
682 spin_unlock_bh(&mpath->state_lock);
683 goto fail;
684 }
685 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
686 spin_unlock_bh(&mpath->state_lock);
687 --ttl;
688 flags = PREP_IE_FLAGS(prep_elem);
689 lifetime = PREP_IE_LIFETIME(prep_elem);
690 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
691 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
692 target_sn = PREP_IE_TARGET_SN(prep_elem);
693 orig_sn = PREP_IE_ORIG_SN(prep_elem);
694
695 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
696 target_addr, target_sn, next_hop, hopcount,
697 ttl, lifetime, metric, 0, sdata);
698 rcu_read_unlock();
699
700 sdata->u.mesh.mshstats.fwded_unicast++;
701 sdata->u.mesh.mshstats.fwded_frames++;
702 return;
703
704 fail:
705 rcu_read_unlock();
706 sdata->u.mesh.mshstats.dropped_frames_no_route++;
707 }
708
709 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
710 struct ieee80211_mgmt *mgmt,
711 const u8 *perr_elem)
712 {
713 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
714 struct mesh_path *mpath;
715 u8 ttl;
716 const u8 *ta, *target_addr;
717 u32 target_sn;
718 u16 target_rcode;
719
720 ta = mgmt->sa;
721 ttl = PERR_IE_TTL(perr_elem);
722 if (ttl <= 1) {
723 ifmsh->mshstats.dropped_frames_ttl++;
724 return;
725 }
726 ttl--;
727 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
728 target_sn = PERR_IE_TARGET_SN(perr_elem);
729 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
730
731 rcu_read_lock();
732 mpath = mesh_path_lookup(sdata, target_addr);
733 if (mpath) {
734 struct sta_info *sta;
735
736 spin_lock_bh(&mpath->state_lock);
737 sta = next_hop_deref_protected(mpath);
738 if (mpath->flags & MESH_PATH_ACTIVE &&
739 ether_addr_equal(ta, sta->sta.addr) &&
740 (!(mpath->flags & MESH_PATH_SN_VALID) ||
741 SN_GT(target_sn, mpath->sn))) {
742 mpath->flags &= ~MESH_PATH_ACTIVE;
743 mpath->sn = target_sn;
744 spin_unlock_bh(&mpath->state_lock);
745 if (!ifmsh->mshcfg.dot11MeshForwarding)
746 goto endperr;
747 mesh_path_error_tx(sdata, ttl, target_addr,
748 target_sn, target_rcode,
749 broadcast_addr);
750 } else
751 spin_unlock_bh(&mpath->state_lock);
752 }
753 endperr:
754 rcu_read_unlock();
755 }
756
757 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
758 struct ieee80211_mgmt *mgmt,
759 const struct ieee80211_rann_ie *rann)
760 {
761 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
762 struct ieee80211_local *local = sdata->local;
763 struct sta_info *sta;
764 struct mesh_path *mpath;
765 u8 ttl, flags, hopcount;
766 const u8 *orig_addr;
767 u32 orig_sn, metric, metric_txsta, interval;
768 bool root_is_gate;
769
770 ttl = rann->rann_ttl;
771 flags = rann->rann_flags;
772 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
773 orig_addr = rann->rann_addr;
774 orig_sn = le32_to_cpu(rann->rann_seq);
775 interval = le32_to_cpu(rann->rann_interval);
776 hopcount = rann->rann_hopcount;
777 hopcount++;
778 metric = le32_to_cpu(rann->rann_metric);
779
780 /* Ignore our own RANNs */
781 if (ether_addr_equal(orig_addr, sdata->vif.addr))
782 return;
783
784 mhwmp_dbg(sdata,
785 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
786 orig_addr, mgmt->sa, root_is_gate);
787
788 rcu_read_lock();
789 sta = sta_info_get(sdata, mgmt->sa);
790 if (!sta) {
791 rcu_read_unlock();
792 return;
793 }
794
795 metric_txsta = airtime_link_metric_get(local, sta);
796
797 mpath = mesh_path_lookup(sdata, orig_addr);
798 if (!mpath) {
799 mpath = mesh_path_add(sdata, orig_addr);
800 if (IS_ERR(mpath)) {
801 rcu_read_unlock();
802 sdata->u.mesh.mshstats.dropped_frames_no_route++;
803 return;
804 }
805 }
806
807 if (!(SN_LT(mpath->sn, orig_sn)) &&
808 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
809 rcu_read_unlock();
810 return;
811 }
812
813 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
814 (time_after(jiffies, mpath->last_preq_to_root +
815 root_path_confirmation_jiffies(sdata)) ||
816 time_before(jiffies, mpath->last_preq_to_root))) &&
817 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
818 mhwmp_dbg(sdata,
819 "time to refresh root mpath %pM\n",
820 orig_addr);
821 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
822 mpath->last_preq_to_root = jiffies;
823 }
824
825 mpath->sn = orig_sn;
826 mpath->rann_metric = metric + metric_txsta;
827 mpath->is_root = true;
828 /* Recording RANNs sender address to send individually
829 * addressed PREQs destined for root mesh STA */
830 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
831
832 if (root_is_gate)
833 mesh_path_add_gate(mpath);
834
835 if (ttl <= 1) {
836 ifmsh->mshstats.dropped_frames_ttl++;
837 rcu_read_unlock();
838 return;
839 }
840 ttl--;
841
842 if (ifmsh->mshcfg.dot11MeshForwarding) {
843 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
844 orig_sn, 0, NULL, 0, broadcast_addr,
845 hopcount, ttl, interval,
846 metric + metric_txsta, 0, sdata);
847 }
848
849 rcu_read_unlock();
850 }
851
852
853 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
854 struct ieee80211_mgmt *mgmt, size_t len)
855 {
856 struct ieee802_11_elems elems;
857 size_t baselen;
858 u32 last_hop_metric;
859 struct sta_info *sta;
860
861 /* need action_code */
862 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
863 return;
864
865 rcu_read_lock();
866 sta = sta_info_get(sdata, mgmt->sa);
867 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) {
868 rcu_read_unlock();
869 return;
870 }
871 rcu_read_unlock();
872
873 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
874 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
875 len - baselen, false, &elems);
876
877 if (elems.preq) {
878 if (elems.preq_len != 37)
879 /* Right now we support just 1 destination and no AE */
880 return;
881 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
882 MPATH_PREQ);
883 if (last_hop_metric)
884 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
885 last_hop_metric);
886 }
887 if (elems.prep) {
888 if (elems.prep_len != 31)
889 /* Right now we support no AE */
890 return;
891 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
892 MPATH_PREP);
893 if (last_hop_metric)
894 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
895 last_hop_metric);
896 }
897 if (elems.perr) {
898 if (elems.perr_len != 15)
899 /* Right now we support only one destination per PERR */
900 return;
901 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
902 }
903 if (elems.rann)
904 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
905 }
906
907 /**
908 * mesh_queue_preq - queue a PREQ to a given destination
909 *
910 * @mpath: mesh path to discover
911 * @flags: special attributes of the PREQ to be sent
912 *
913 * Locking: the function must be called from within a rcu read lock block.
914 *
915 */
916 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
917 {
918 struct ieee80211_sub_if_data *sdata = mpath->sdata;
919 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
920 struct mesh_preq_queue *preq_node;
921
922 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
923 if (!preq_node) {
924 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
925 return;
926 }
927
928 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
929 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
930 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
931 kfree(preq_node);
932 if (printk_ratelimit())
933 mhwmp_dbg(sdata, "PREQ node queue full\n");
934 return;
935 }
936
937 spin_lock(&mpath->state_lock);
938 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
939 spin_unlock(&mpath->state_lock);
940 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
941 kfree(preq_node);
942 return;
943 }
944
945 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
946 preq_node->flags = flags;
947
948 mpath->flags |= MESH_PATH_REQ_QUEUED;
949 spin_unlock(&mpath->state_lock);
950
951 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
952 ++ifmsh->preq_queue_len;
953 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
954
955 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
956 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
957
958 else if (time_before(jiffies, ifmsh->last_preq)) {
959 /* avoid long wait if did not send preqs for a long time
960 * and jiffies wrapped around
961 */
962 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
963 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
964 } else
965 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
966 min_preq_int_jiff(sdata));
967 }
968
969 /**
970 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
971 *
972 * @sdata: local mesh subif
973 */
974 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
975 {
976 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
977 struct mesh_preq_queue *preq_node;
978 struct mesh_path *mpath;
979 u8 ttl, target_flags;
980 const u8 *da;
981 u32 lifetime;
982
983 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
984 if (!ifmsh->preq_queue_len ||
985 time_before(jiffies, ifmsh->last_preq +
986 min_preq_int_jiff(sdata))) {
987 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
988 return;
989 }
990
991 preq_node = list_first_entry(&ifmsh->preq_queue.list,
992 struct mesh_preq_queue, list);
993 list_del(&preq_node->list);
994 --ifmsh->preq_queue_len;
995 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
996
997 rcu_read_lock();
998 mpath = mesh_path_lookup(sdata, preq_node->dst);
999 if (!mpath)
1000 goto enddiscovery;
1001
1002 spin_lock_bh(&mpath->state_lock);
1003 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1004 if (preq_node->flags & PREQ_Q_F_START) {
1005 if (mpath->flags & MESH_PATH_RESOLVING) {
1006 spin_unlock_bh(&mpath->state_lock);
1007 goto enddiscovery;
1008 } else {
1009 mpath->flags &= ~MESH_PATH_RESOLVED;
1010 mpath->flags |= MESH_PATH_RESOLVING;
1011 mpath->discovery_retries = 0;
1012 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1013 }
1014 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1015 mpath->flags & MESH_PATH_RESOLVED) {
1016 mpath->flags &= ~MESH_PATH_RESOLVING;
1017 spin_unlock_bh(&mpath->state_lock);
1018 goto enddiscovery;
1019 }
1020
1021 ifmsh->last_preq = jiffies;
1022
1023 if (time_after(jiffies, ifmsh->last_sn_update +
1024 net_traversal_jiffies(sdata)) ||
1025 time_before(jiffies, ifmsh->last_sn_update)) {
1026 ++ifmsh->sn;
1027 sdata->u.mesh.last_sn_update = jiffies;
1028 }
1029 lifetime = default_lifetime(sdata);
1030 ttl = sdata->u.mesh.mshcfg.element_ttl;
1031 if (ttl == 0) {
1032 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1033 spin_unlock_bh(&mpath->state_lock);
1034 goto enddiscovery;
1035 }
1036
1037 if (preq_node->flags & PREQ_Q_F_REFRESH)
1038 target_flags = MP_F_DO;
1039 else
1040 target_flags = MP_F_RF;
1041
1042 spin_unlock_bh(&mpath->state_lock);
1043 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1044 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1045 target_flags, mpath->dst, mpath->sn, da, 0,
1046 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
1047 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1048
1049 enddiscovery:
1050 rcu_read_unlock();
1051 kfree(preq_node);
1052 }
1053
1054 /**
1055 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1056 *
1057 * @skb: 802.11 frame to be sent
1058 * @sdata: network subif the frame will be sent through
1059 *
1060 * Lookup next hop for given skb and start path discovery if no
1061 * forwarding information is found.
1062 *
1063 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1064 * skb is freeed here if no mpath could be allocated.
1065 */
1066 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1067 struct sk_buff *skb)
1068 {
1069 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1070 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1071 struct mesh_path *mpath;
1072 struct sk_buff *skb_to_free = NULL;
1073 u8 *target_addr = hdr->addr3;
1074 int err = 0;
1075
1076 /* Nulls are only sent to peers for PS and should be pre-addressed */
1077 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1078 return 0;
1079
1080 rcu_read_lock();
1081 err = mesh_nexthop_lookup(sdata, skb);
1082 if (!err)
1083 goto endlookup;
1084
1085 /* no nexthop found, start resolving */
1086 mpath = mesh_path_lookup(sdata, target_addr);
1087 if (!mpath) {
1088 mpath = mesh_path_add(sdata, target_addr);
1089 if (IS_ERR(mpath)) {
1090 mesh_path_discard_frame(sdata, skb);
1091 err = PTR_ERR(mpath);
1092 goto endlookup;
1093 }
1094 }
1095
1096 if (!(mpath->flags & MESH_PATH_RESOLVING))
1097 mesh_queue_preq(mpath, PREQ_Q_F_START);
1098
1099 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1100 skb_to_free = skb_dequeue(&mpath->frame_queue);
1101
1102 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1103 ieee80211_set_qos_hdr(sdata, skb);
1104 skb_queue_tail(&mpath->frame_queue, skb);
1105 err = -ENOENT;
1106 if (skb_to_free)
1107 mesh_path_discard_frame(sdata, skb_to_free);
1108
1109 endlookup:
1110 rcu_read_unlock();
1111 return err;
1112 }
1113
1114 /**
1115 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1116 * this function is considered "using" the associated mpath, so preempt a path
1117 * refresh if this mpath expires soon.
1118 *
1119 * @skb: 802.11 frame to be sent
1120 * @sdata: network subif the frame will be sent through
1121 *
1122 * Returns: 0 if the next hop was found. Nonzero otherwise.
1123 */
1124 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1125 struct sk_buff *skb)
1126 {
1127 struct mesh_path *mpath;
1128 struct sta_info *next_hop;
1129 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1130 u8 *target_addr = hdr->addr3;
1131 int err = -ENOENT;
1132
1133 rcu_read_lock();
1134 mpath = mesh_path_lookup(sdata, target_addr);
1135
1136 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1137 goto endlookup;
1138
1139 if (time_after(jiffies,
1140 mpath->exp_time -
1141 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1142 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
1143 !(mpath->flags & MESH_PATH_RESOLVING) &&
1144 !(mpath->flags & MESH_PATH_FIXED))
1145 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1146
1147 next_hop = rcu_dereference(mpath->next_hop);
1148 if (next_hop) {
1149 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1150 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1151 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
1152 err = 0;
1153 }
1154
1155 endlookup:
1156 rcu_read_unlock();
1157 return err;
1158 }
1159
1160 void mesh_path_timer(unsigned long data)
1161 {
1162 struct mesh_path *mpath = (void *) data;
1163 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1164 int ret;
1165
1166 if (sdata->local->quiescing)
1167 return;
1168
1169 spin_lock_bh(&mpath->state_lock);
1170 if (mpath->flags & MESH_PATH_RESOLVED ||
1171 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1172 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1173 spin_unlock_bh(&mpath->state_lock);
1174 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1175 ++mpath->discovery_retries;
1176 mpath->discovery_timeout *= 2;
1177 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1178 spin_unlock_bh(&mpath->state_lock);
1179 mesh_queue_preq(mpath, 0);
1180 } else {
1181 mpath->flags = 0;
1182 mpath->exp_time = jiffies;
1183 spin_unlock_bh(&mpath->state_lock);
1184 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1185 ret = mesh_path_send_to_gates(mpath);
1186 if (ret)
1187 mhwmp_dbg(sdata, "no gate was reachable\n");
1188 } else
1189 mesh_path_flush_pending(mpath);
1190 }
1191 }
1192
1193 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1194 {
1195 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1196 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1197 u8 flags, target_flags = 0;
1198
1199 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1200 ? RANN_FLAG_IS_GATE : 0;
1201
1202 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1203 case IEEE80211_PROACTIVE_RANN:
1204 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1205 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1206 0, ifmsh->mshcfg.element_ttl,
1207 interval, 0, 0, sdata);
1208 break;
1209 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1210 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1211 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1212 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1213 target_flags |= IEEE80211_PREQ_TO_FLAG |
1214 IEEE80211_PREQ_USN_FLAG;
1215 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1216 ++ifmsh->sn, target_flags,
1217 (u8 *) broadcast_addr, 0, broadcast_addr,
1218 0, ifmsh->mshcfg.element_ttl, interval,
1219 0, ifmsh->preq_id++, sdata);
1220 break;
1221 default:
1222 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
1223 return;
1224 }
1225 }
Linux with added FPC-III support