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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / net / mac80211 / mesh_hwmp.c
blob002244bca948520f9e3d722dc908c62aa3eb4fb1
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 static void mesh_queue_preq(struct mesh_path *, u8);
23
24 static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae)
25 {
26 if (ae)
27 offset += 6;
28 return get_unaligned_le32(preq_elem + offset);
29 }
30
31 static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae)
32 {
33 if (ae)
34 offset += 6;
35 return get_unaligned_le16(preq_elem + offset);
36 }
37
38 /* HWMP IE processing macros */
39 #define AE_F (1<<6)
40 #define AE_F_SET(x) (*x & AE_F)
41 #define PREQ_IE_FLAGS(x) (*(x))
42 #define PREQ_IE_HOPCOUNT(x) (*(x + 1))
43 #define PREQ_IE_TTL(x) (*(x + 2))
44 #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0)
45 #define PREQ_IE_ORIG_ADDR(x) (x + 7)
46 #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0)
47 #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x))
48 #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x))
49 #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26))
50 #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27)
51 #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x))
52
53
54 #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x)
55 #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x)
56 #define PREP_IE_TTL(x) PREQ_IE_TTL(x)
57 #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21)
58 #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x))
59 #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x))
60 #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x))
61 #define PREP_IE_TARGET_ADDR(x) (x + 3)
62 #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
63
64 #define PERR_IE_TTL(x) (*(x))
65 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
66 #define PERR_IE_TARGET_ADDR(x) (x + 3)
67 #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0)
68 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
69
70 #define MSEC_TO_TU(x) (x*1000/1024)
71 #define SN_GT(x, y) ((s32)(y - x) < 0)
72 #define SN_LT(x, y) ((s32)(x - y) < 0)
73 #define MAX_SANE_SN_DELTA 32
74
75 static inline u32 SN_DELTA(u32 x, u32 y)
76 {
77 return x >= y ? x - y : y - x;
78 }
79
80 #define net_traversal_jiffies(s) \
81 msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
82 #define default_lifetime(s) \
83 MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
84 #define min_preq_int_jiff(s) \
85 (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
86 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
87 #define disc_timeout_jiff(s) \
88 msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
89 #define root_path_confirmation_jiffies(s) \
90 msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval)
91
92 enum mpath_frame_type {
93 MPATH_PREQ = 0,
94 MPATH_PREP,
95 MPATH_PERR,
96 MPATH_RANN
97 };
98
99 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
100
101 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
102 const u8 *orig_addr, u32 orig_sn,
103 u8 target_flags, const u8 *target,
104 u32 target_sn, const u8 *da,
105 u8 hop_count, u8 ttl,
106 u32 lifetime, u32 metric, u32 preq_id,
107 struct ieee80211_sub_if_data *sdata)
108 {
109 struct ieee80211_local *local = sdata->local;
110 struct sk_buff *skb;
111 struct ieee80211_mgmt *mgmt;
112 u8 *pos, ie_len;
113 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
114 sizeof(mgmt->u.action.u.mesh_action);
115
116 skb = dev_alloc_skb(local->tx_headroom +
117 hdr_len +
118 2 + 37); /* max HWMP IE */
119 if (!skb)
120 return -1;
121 skb_reserve(skb, local->tx_headroom);
122 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
123 memset(mgmt, 0, hdr_len);
124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125 IEEE80211_STYPE_ACTION);
126
127 memcpy(mgmt->da, da, ETH_ALEN);
128 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
129 /* BSSID == SA */
130 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
131 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
132 mgmt->u.action.u.mesh_action.action_code =
133 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
134
135 switch (action) {
136 case MPATH_PREQ:
137 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
138 ie_len = 37;
139 pos = skb_put(skb, 2 + ie_len);
140 *pos++ = WLAN_EID_PREQ;
141 break;
142 case MPATH_PREP:
143 mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr);
144 ie_len = 31;
145 pos = skb_put(skb, 2 + ie_len);
146 *pos++ = WLAN_EID_PREP;
147 break;
148 case MPATH_RANN:
149 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
150 ie_len = sizeof(struct ieee80211_rann_ie);
151 pos = skb_put(skb, 2 + ie_len);
152 *pos++ = WLAN_EID_RANN;
153 break;
154 default:
155 kfree_skb(skb);
156 return -ENOTSUPP;
157 }
158 *pos++ = ie_len;
159 *pos++ = flags;
160 *pos++ = hop_count;
161 *pos++ = ttl;
162 if (action == MPATH_PREP) {
163 memcpy(pos, target, ETH_ALEN);
164 pos += ETH_ALEN;
165 put_unaligned_le32(target_sn, pos);
166 pos += 4;
167 } else {
168 if (action == MPATH_PREQ) {
169 put_unaligned_le32(preq_id, pos);
170 pos += 4;
171 }
172 memcpy(pos, orig_addr, ETH_ALEN);
173 pos += ETH_ALEN;
174 put_unaligned_le32(orig_sn, pos);
175 pos += 4;
176 }
177 put_unaligned_le32(lifetime, pos); /* interval for RANN */
178 pos += 4;
179 put_unaligned_le32(metric, pos);
180 pos += 4;
181 if (action == MPATH_PREQ) {
182 *pos++ = 1; /* destination count */
183 *pos++ = target_flags;
184 memcpy(pos, target, ETH_ALEN);
185 pos += ETH_ALEN;
186 put_unaligned_le32(target_sn, pos);
187 pos += 4;
188 } else if (action == MPATH_PREP) {
189 memcpy(pos, orig_addr, ETH_ALEN);
190 pos += ETH_ALEN;
191 put_unaligned_le32(orig_sn, pos);
192 pos += 4;
193 }
194
195 ieee80211_tx_skb(sdata, skb);
196 return 0;
197 }
198
199
200 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
201 * headroom in case the frame is encrypted. */
202 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
203 struct sk_buff *skb)
204 {
205 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
206 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
207
208 skb_reset_mac_header(skb);
209 skb_reset_network_header(skb);
210 skb_reset_transport_header(skb);
211
212 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
213 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
214 skb->priority = 7;
215
216 info->control.vif = &sdata->vif;
217 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
218 ieee80211_set_qos_hdr(sdata, skb);
219 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
220 }
221
222 /**
223 * mesh_path_error_tx - Sends a PERR mesh management frame
224 *
225 * @ttl: allowed remaining hops
226 * @target: broken destination
227 * @target_sn: SN of the broken destination
228 * @target_rcode: reason code for this PERR
229 * @ra: node this frame is addressed to
230 * @sdata: local mesh subif
231 *
232 * Note: This function may be called with driver locks taken that the driver
233 * also acquires in the TX path. To avoid a deadlock we don't transmit the
234 * frame directly but add it to the pending queue instead.
235 */
236 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
237 u8 ttl, const u8 *target, u32 target_sn,
238 u16 target_rcode, const u8 *ra)
239 {
240 struct ieee80211_local *local = sdata->local;
241 struct sk_buff *skb;
242 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
243 struct ieee80211_mgmt *mgmt;
244 u8 *pos, ie_len;
245 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
246 sizeof(mgmt->u.action.u.mesh_action);
247
248 if (time_before(jiffies, ifmsh->next_perr))
249 return -EAGAIN;
250
251 skb = dev_alloc_skb(local->tx_headroom +
252 sdata->encrypt_headroom +
253 IEEE80211_ENCRYPT_TAILROOM +
254 hdr_len +
255 2 + 15 /* PERR IE */);
256 if (!skb)
257 return -1;
258 skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom);
259 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
260 memset(mgmt, 0, hdr_len);
261 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
262 IEEE80211_STYPE_ACTION);
263
264 memcpy(mgmt->da, ra, ETH_ALEN);
265 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
266 /* BSSID == SA */
267 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
268 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
269 mgmt->u.action.u.mesh_action.action_code =
270 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
271 ie_len = 15;
272 pos = skb_put(skb, 2 + ie_len);
273 *pos++ = WLAN_EID_PERR;
274 *pos++ = ie_len;
275 /* ttl */
276 *pos++ = ttl;
277 /* number of destinations */
278 *pos++ = 1;
279 /* Flags field has AE bit only as defined in
280 * sec 8.4.2.117 IEEE802.11-2012
281 */
282 *pos = 0;
283 pos++;
284 memcpy(pos, target, ETH_ALEN);
285 pos += ETH_ALEN;
286 put_unaligned_le32(target_sn, pos);
287 pos += 4;
288 put_unaligned_le16(target_rcode, pos);
289
290 /* see note in function header */
291 prepare_frame_for_deferred_tx(sdata, skb);
292 ifmsh->next_perr = TU_TO_EXP_TIME(
293 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
294 ieee80211_add_pending_skb(local, skb);
295 return 0;
296 }
297
298 void ieee80211s_update_metric(struct ieee80211_local *local,
299 struct sta_info *sta, struct sk_buff *skb)
300 {
301 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
302 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
303 int failed;
304
305 if (!ieee80211_is_data(hdr->frame_control))
306 return;
307
308 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
309
310 /* moving average, scaled to 100 */
311 sta->mesh->fail_avg =
312 ((80 * sta->mesh->fail_avg + 5) / 100 + 20 * failed);
313 if (sta->mesh->fail_avg > 95)
314 mesh_plink_broken(sta);
315 }
316
317 static u32 airtime_link_metric_get(struct ieee80211_local *local,
318 struct sta_info *sta)
319 {
320 struct rate_info rinfo;
321 /* This should be adjusted for each device */
322 int device_constant = 1 << ARITH_SHIFT;
323 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
324 int s_unit = 1 << ARITH_SHIFT;
325 int rate, err;
326 u32 tx_time, estimated_retx;
327 u64 result;
328
329 if (sta->mesh->fail_avg >= 100)
330 return MAX_METRIC;
331
332 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
333 rate = cfg80211_calculate_bitrate(&rinfo);
334 if (WARN_ON(!rate))
335 return MAX_METRIC;
336
337 err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100;
338
339 /* bitrate is in units of 100 Kbps, while we need rate in units of
340 * 1Mbps. This will be corrected on tx_time computation.
341 */
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) ;
345 return (u32)result;
346 }
347
348 /**
349 * hwmp_route_info_get - Update routing info to originator and transmitter
350 *
351 * @sdata: local mesh subif
352 * @mgmt: mesh management frame
353 * @hwmp_ie: hwmp information element (PREP or PREQ)
354 * @action: type of hwmp ie
355 *
356 * This function updates the path routing information to the originator and the
357 * transmitter of a HWMP PREQ or PREP frame.
358 *
359 * Returns: metric to frame originator or 0 if the frame should not be further
360 * processed
361 *
362 * Notes: this function is the only place (besides user-provided info) where
363 * path routing information is updated.
364 */
365 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
366 struct ieee80211_mgmt *mgmt,
367 const u8 *hwmp_ie, enum mpath_frame_type action)
368 {
369 struct ieee80211_local *local = sdata->local;
370 struct mesh_path *mpath;
371 struct sta_info *sta;
372 bool fresh_info;
373 const u8 *orig_addr, *ta;
374 u32 orig_sn, orig_metric;
375 unsigned long orig_lifetime, exp_time;
376 u32 last_hop_metric, new_metric;
377 bool process = true;
378
379 rcu_read_lock();
380 sta = sta_info_get(sdata, mgmt->sa);
381 if (!sta) {
382 rcu_read_unlock();
383 return 0;
384 }
385
386 last_hop_metric = airtime_link_metric_get(local, sta);
387 /* Update and check originator routing info */
388 fresh_info = true;
389
390 switch (action) {
391 case MPATH_PREQ:
392 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
393 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
394 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
395 orig_metric = PREQ_IE_METRIC(hwmp_ie);
396 break;
397 case MPATH_PREP:
398 /* Originator here refers to the MP that was the target in the
399 * Path Request. We divert from the nomenclature in the draft
400 * so that we can easily use a single function to gather path
401 * information from both PREQ and PREP frames.
402 */
403 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
404 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
405 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
406 orig_metric = PREP_IE_METRIC(hwmp_ie);
407 break;
408 default:
409 rcu_read_unlock();
410 return 0;
411 }
412 new_metric = orig_metric + last_hop_metric;
413 if (new_metric < orig_metric)
414 new_metric = MAX_METRIC;
415 exp_time = TU_TO_EXP_TIME(orig_lifetime);
416
417 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
418 /* This MP is the originator, we are not interested in this
419 * frame, except for updating transmitter's path info.
420 */
421 process = false;
422 fresh_info = false;
423 } else {
424 mpath = mesh_path_lookup(sdata, orig_addr);
425 if (mpath) {
426 spin_lock_bh(&mpath->state_lock);
427 if (mpath->flags & MESH_PATH_FIXED)
428 fresh_info = false;
429 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
430 (mpath->flags & MESH_PATH_SN_VALID)) {
431 if (SN_GT(mpath->sn, orig_sn) ||
432 (mpath->sn == orig_sn &&
433 new_metric >= mpath->metric)) {
434 process = false;
435 fresh_info = false;
436 }
437 } else if (!(mpath->flags & MESH_PATH_ACTIVE)) {
438 bool have_sn, newer_sn, bounced;
439
440 have_sn = mpath->flags & MESH_PATH_SN_VALID;
441 newer_sn = have_sn && SN_GT(orig_sn, mpath->sn);
442 bounced = have_sn &&
443 (SN_DELTA(orig_sn, mpath->sn) >
444 MAX_SANE_SN_DELTA);
445
446 if (!have_sn || newer_sn) {
447 /* if SN is newer than what we had
448 * then we can take it */;
449 } else if (bounced) {
450 /* if SN is way different than what
451 * we had then assume the other side
452 * rebooted or restarted */;
453 } else {
454 process = false;
455 fresh_info = false;
456 }
457 }
458 } else {
459 mpath = mesh_path_add(sdata, orig_addr);
460 if (IS_ERR(mpath)) {
461 rcu_read_unlock();
462 return 0;
463 }
464 spin_lock_bh(&mpath->state_lock);
465 }
466
467 if (fresh_info) {
468 mesh_path_assign_nexthop(mpath, sta);
469 mpath->flags |= MESH_PATH_SN_VALID;
470 mpath->metric = new_metric;
471 mpath->sn = orig_sn;
472 mpath->exp_time = time_after(mpath->exp_time, exp_time)
473 ? mpath->exp_time : exp_time;
474 mesh_path_activate(mpath);
475 spin_unlock_bh(&mpath->state_lock);
476 mesh_path_tx_pending(mpath);
477 /* draft says preq_id should be saved to, but there does
478 * not seem to be any use for it, skipping by now
479 */
480 } else
481 spin_unlock_bh(&mpath->state_lock);
482 }
483
484 /* Update and check transmitter routing info */
485 ta = mgmt->sa;
486 if (ether_addr_equal(orig_addr, ta))
487 fresh_info = false;
488 else {
489 fresh_info = true;
490
491 mpath = mesh_path_lookup(sdata, ta);
492 if (mpath) {
493 spin_lock_bh(&mpath->state_lock);
494 if ((mpath->flags & MESH_PATH_FIXED) ||
495 ((mpath->flags & MESH_PATH_ACTIVE) &&
496 (last_hop_metric > mpath->metric)))
497 fresh_info = false;
498 } else {
499 mpath = mesh_path_add(sdata, ta);
500 if (IS_ERR(mpath)) {
501 rcu_read_unlock();
502 return 0;
503 }
504 spin_lock_bh(&mpath->state_lock);
505 }
506
507 if (fresh_info) {
508 mesh_path_assign_nexthop(mpath, sta);
509 mpath->metric = last_hop_metric;
510 mpath->exp_time = time_after(mpath->exp_time, exp_time)
511 ? mpath->exp_time : exp_time;
512 mesh_path_activate(mpath);
513 spin_unlock_bh(&mpath->state_lock);
514 mesh_path_tx_pending(mpath);
515 } else
516 spin_unlock_bh(&mpath->state_lock);
517 }
518
519 rcu_read_unlock();
520
521 return process ? new_metric : 0;
522 }
523
524 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
525 struct ieee80211_mgmt *mgmt,
526 const u8 *preq_elem, u32 orig_metric)
527 {
528 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
529 struct mesh_path *mpath = NULL;
530 const u8 *target_addr, *orig_addr;
531 const u8 *da;
532 u8 target_flags, ttl, flags;
533 u32 orig_sn, target_sn, lifetime, target_metric = 0;
534 bool reply = false;
535 bool forward = true;
536 bool root_is_gate;
537
538 /* Update target SN, if present */
539 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
540 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
541 target_sn = PREQ_IE_TARGET_SN(preq_elem);
542 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
543 target_flags = PREQ_IE_TARGET_F(preq_elem);
544 /* Proactive PREQ gate announcements */
545 flags = PREQ_IE_FLAGS(preq_elem);
546 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
547
548 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
549
550 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
551 mhwmp_dbg(sdata, "PREQ is for us\n");
552 forward = false;
553 reply = true;
554 target_metric = 0;
555 if (time_after(jiffies, ifmsh->last_sn_update +
556 net_traversal_jiffies(sdata)) ||
557 time_before(jiffies, ifmsh->last_sn_update)) {
558 ++ifmsh->sn;
559 ifmsh->last_sn_update = jiffies;
560 }
561 target_sn = ifmsh->sn;
562 } else if (is_broadcast_ether_addr(target_addr) &&
563 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
564 rcu_read_lock();
565 mpath = mesh_path_lookup(sdata, orig_addr);
566 if (mpath) {
567 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
568 reply = true;
569 target_addr = sdata->vif.addr;
570 target_sn = ++ifmsh->sn;
571 target_metric = 0;
572 ifmsh->last_sn_update = jiffies;
573 }
574 if (root_is_gate)
575 mesh_path_add_gate(mpath);
576 }
577 rcu_read_unlock();
578 } else {
579 rcu_read_lock();
580 mpath = mesh_path_lookup(sdata, target_addr);
581 if (mpath) {
582 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
583 SN_LT(mpath->sn, target_sn)) {
584 mpath->sn = target_sn;
585 mpath->flags |= MESH_PATH_SN_VALID;
586 } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) &&
587 (mpath->flags & MESH_PATH_ACTIVE)) {
588 reply = true;
589 target_metric = mpath->metric;
590 target_sn = mpath->sn;
591 /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/
592 target_flags |= IEEE80211_PREQ_TO_FLAG;
593 }
594 }
595 rcu_read_unlock();
596 }
597
598 if (reply) {
599 lifetime = PREQ_IE_LIFETIME(preq_elem);
600 ttl = ifmsh->mshcfg.element_ttl;
601 if (ttl != 0) {
602 mhwmp_dbg(sdata, "replying to the PREQ\n");
603 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
604 orig_sn, 0, target_addr,
605 target_sn, mgmt->sa, 0, ttl,
606 lifetime, target_metric, 0,
607 sdata);
608 } else {
609 ifmsh->mshstats.dropped_frames_ttl++;
610 }
611 }
612
613 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
614 u32 preq_id;
615 u8 hopcount;
616
617 ttl = PREQ_IE_TTL(preq_elem);
618 lifetime = PREQ_IE_LIFETIME(preq_elem);
619 if (ttl <= 1) {
620 ifmsh->mshstats.dropped_frames_ttl++;
621 return;
622 }
623 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
624 --ttl;
625 preq_id = PREQ_IE_PREQ_ID(preq_elem);
626 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
627 da = (mpath && mpath->is_root) ?
628 mpath->rann_snd_addr : broadcast_addr;
629
630 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
631 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
632 target_sn = PREQ_IE_TARGET_SN(preq_elem);
633 }
634
635 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
636 orig_sn, target_flags, target_addr,
637 target_sn, da, hopcount, ttl, lifetime,
638 orig_metric, preq_id, sdata);
639 if (!is_multicast_ether_addr(da))
640 ifmsh->mshstats.fwded_unicast++;
641 else
642 ifmsh->mshstats.fwded_mcast++;
643 ifmsh->mshstats.fwded_frames++;
644 }
645 }
646
647
648 static inline struct sta_info *
649 next_hop_deref_protected(struct mesh_path *mpath)
650 {
651 return rcu_dereference_protected(mpath->next_hop,
652 lockdep_is_held(&mpath->state_lock));
653 }
654
655
656 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
657 struct ieee80211_mgmt *mgmt,
658 const u8 *prep_elem, u32 metric)
659 {
660 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
661 struct mesh_path *mpath;
662 const u8 *target_addr, *orig_addr;
663 u8 ttl, hopcount, flags;
664 u8 next_hop[ETH_ALEN];
665 u32 target_sn, orig_sn, lifetime;
666
667 mhwmp_dbg(sdata, "received PREP from %pM\n",
668 PREP_IE_TARGET_ADDR(prep_elem));
669
670 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
671 if (ether_addr_equal(orig_addr, sdata->vif.addr))
672 /* destination, no forwarding required */
673 return;
674
675 if (!ifmsh->mshcfg.dot11MeshForwarding)
676 return;
677
678 ttl = PREP_IE_TTL(prep_elem);
679 if (ttl <= 1) {
680 sdata->u.mesh.mshstats.dropped_frames_ttl++;
681 return;
682 }
683
684 rcu_read_lock();
685 mpath = mesh_path_lookup(sdata, orig_addr);
686 if (mpath)
687 spin_lock_bh(&mpath->state_lock);
688 else
689 goto fail;
690 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
691 spin_unlock_bh(&mpath->state_lock);
692 goto fail;
693 }
694 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
695 spin_unlock_bh(&mpath->state_lock);
696 --ttl;
697 flags = PREP_IE_FLAGS(prep_elem);
698 lifetime = PREP_IE_LIFETIME(prep_elem);
699 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
700 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
701 target_sn = PREP_IE_TARGET_SN(prep_elem);
702 orig_sn = PREP_IE_ORIG_SN(prep_elem);
703
704 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0,
705 target_addr, target_sn, next_hop, hopcount,
706 ttl, lifetime, metric, 0, sdata);
707 rcu_read_unlock();
708
709 sdata->u.mesh.mshstats.fwded_unicast++;
710 sdata->u.mesh.mshstats.fwded_frames++;
711 return;
712
713 fail:
714 rcu_read_unlock();
715 sdata->u.mesh.mshstats.dropped_frames_no_route++;
716 }
717
718 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
719 struct ieee80211_mgmt *mgmt,
720 const u8 *perr_elem)
721 {
722 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
723 struct mesh_path *mpath;
724 u8 ttl;
725 const u8 *ta, *target_addr;
726 u32 target_sn;
727 u16 target_rcode;
728
729 ta = mgmt->sa;
730 ttl = PERR_IE_TTL(perr_elem);
731 if (ttl <= 1) {
732 ifmsh->mshstats.dropped_frames_ttl++;
733 return;
734 }
735 ttl--;
736 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
737 target_sn = PERR_IE_TARGET_SN(perr_elem);
738 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
739
740 rcu_read_lock();
741 mpath = mesh_path_lookup(sdata, target_addr);
742 if (mpath) {
743 struct sta_info *sta;
744
745 spin_lock_bh(&mpath->state_lock);
746 sta = next_hop_deref_protected(mpath);
747 if (mpath->flags & MESH_PATH_ACTIVE &&
748 ether_addr_equal(ta, sta->sta.addr) &&
749 (!(mpath->flags & MESH_PATH_SN_VALID) ||
750 SN_GT(target_sn, mpath->sn) || target_sn == 0)) {
751 mpath->flags &= ~MESH_PATH_ACTIVE;
752 if (target_sn != 0)
753 mpath->sn = target_sn;
754 else
755 mpath->sn += 1;
756 spin_unlock_bh(&mpath->state_lock);
757 if (!ifmsh->mshcfg.dot11MeshForwarding)
758 goto endperr;
759 mesh_path_error_tx(sdata, ttl, target_addr,
760 target_sn, target_rcode,
761 broadcast_addr);
762 } else
763 spin_unlock_bh(&mpath->state_lock);
764 }
765 endperr:
766 rcu_read_unlock();
767 }
768
769 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
770 struct ieee80211_mgmt *mgmt,
771 const struct ieee80211_rann_ie *rann)
772 {
773 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
774 struct ieee80211_local *local = sdata->local;
775 struct sta_info *sta;
776 struct mesh_path *mpath;
777 u8 ttl, flags, hopcount;
778 const u8 *orig_addr;
779 u32 orig_sn, metric, metric_txsta, interval;
780 bool root_is_gate;
781
782 ttl = rann->rann_ttl;
783 flags = rann->rann_flags;
784 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
785 orig_addr = rann->rann_addr;
786 orig_sn = le32_to_cpu(rann->rann_seq);
787 interval = le32_to_cpu(rann->rann_interval);
788 hopcount = rann->rann_hopcount;
789 hopcount++;
790 metric = le32_to_cpu(rann->rann_metric);
791
792 /* Ignore our own RANNs */
793 if (ether_addr_equal(orig_addr, sdata->vif.addr))
794 return;
795
796 mhwmp_dbg(sdata,
797 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
798 orig_addr, mgmt->sa, root_is_gate);
799
800 rcu_read_lock();
801 sta = sta_info_get(sdata, mgmt->sa);
802 if (!sta) {
803 rcu_read_unlock();
804 return;
805 }
806
807 metric_txsta = airtime_link_metric_get(local, sta);
808
809 mpath = mesh_path_lookup(sdata, orig_addr);
810 if (!mpath) {
811 mpath = mesh_path_add(sdata, orig_addr);
812 if (IS_ERR(mpath)) {
813 rcu_read_unlock();
814 sdata->u.mesh.mshstats.dropped_frames_no_route++;
815 return;
816 }
817 }
818
819 if (!(SN_LT(mpath->sn, orig_sn)) &&
820 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
821 rcu_read_unlock();
822 return;
823 }
824
825 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
826 (time_after(jiffies, mpath->last_preq_to_root +
827 root_path_confirmation_jiffies(sdata)) ||
828 time_before(jiffies, mpath->last_preq_to_root))) &&
829 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
830 mhwmp_dbg(sdata,
831 "time to refresh root mpath %pM\n",
832 orig_addr);
833 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
834 mpath->last_preq_to_root = jiffies;
835 }
836
837 mpath->sn = orig_sn;
838 mpath->rann_metric = metric + metric_txsta;
839 mpath->is_root = true;
840 /* Recording RANNs sender address to send individually
841 * addressed PREQs destined for root mesh STA */
842 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
843
844 if (root_is_gate)
845 mesh_path_add_gate(mpath);
846
847 if (ttl <= 1) {
848 ifmsh->mshstats.dropped_frames_ttl++;
849 rcu_read_unlock();
850 return;
851 }
852 ttl--;
853
854 if (ifmsh->mshcfg.dot11MeshForwarding) {
855 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
856 orig_sn, 0, NULL, 0, broadcast_addr,
857 hopcount, ttl, interval,
858 metric + metric_txsta, 0, sdata);
859 }
860
861 rcu_read_unlock();
862 }
863
864
865 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
866 struct ieee80211_mgmt *mgmt, size_t len)
867 {
868 struct ieee802_11_elems elems;
869 size_t baselen;
870 u32 path_metric;
871 struct sta_info *sta;
872
873 /* need action_code */
874 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
875 return;
876
877 rcu_read_lock();
878 sta = sta_info_get(sdata, mgmt->sa);
879 if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
880 rcu_read_unlock();
881 return;
882 }
883 rcu_read_unlock();
884
885 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
886 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
887 len - baselen, false, &elems);
888
889 if (elems.preq) {
890 if (elems.preq_len != 37)
891 /* Right now we support just 1 destination and no AE */
892 return;
893 path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
894 MPATH_PREQ);
895 if (path_metric)
896 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
897 path_metric);
898 }
899 if (elems.prep) {
900 if (elems.prep_len != 31)
901 /* Right now we support no AE */
902 return;
903 path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
904 MPATH_PREP);
905 if (path_metric)
906 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
907 path_metric);
908 }
909 if (elems.perr) {
910 if (elems.perr_len != 15)
911 /* Right now we support only one destination per PERR */
912 return;
913 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
914 }
915 if (elems.rann)
916 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
917 }
918
919 /**
920 * mesh_queue_preq - queue a PREQ to a given destination
921 *
922 * @mpath: mesh path to discover
923 * @flags: special attributes of the PREQ to be sent
924 *
925 * Locking: the function must be called from within a rcu read lock block.
926 *
927 */
928 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
929 {
930 struct ieee80211_sub_if_data *sdata = mpath->sdata;
931 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
932 struct mesh_preq_queue *preq_node;
933
934 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
935 if (!preq_node) {
936 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
937 return;
938 }
939
940 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
941 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
942 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
943 kfree(preq_node);
944 if (printk_ratelimit())
945 mhwmp_dbg(sdata, "PREQ node queue full\n");
946 return;
947 }
948
949 spin_lock(&mpath->state_lock);
950 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
951 spin_unlock(&mpath->state_lock);
952 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
953 kfree(preq_node);
954 return;
955 }
956
957 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
958 preq_node->flags = flags;
959
960 mpath->flags |= MESH_PATH_REQ_QUEUED;
961 spin_unlock(&mpath->state_lock);
962
963 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
964 ++ifmsh->preq_queue_len;
965 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
966
967 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
968 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
969
970 else if (time_before(jiffies, ifmsh->last_preq)) {
971 /* avoid long wait if did not send preqs for a long time
972 * and jiffies wrapped around
973 */
974 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
975 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
976 } else
977 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
978 min_preq_int_jiff(sdata));
979 }
980
981 /**
982 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
983 *
984 * @sdata: local mesh subif
985 */
986 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
987 {
988 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
989 struct mesh_preq_queue *preq_node;
990 struct mesh_path *mpath;
991 u8 ttl, target_flags = 0;
992 const u8 *da;
993 u32 lifetime;
994
995 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
996 if (!ifmsh->preq_queue_len ||
997 time_before(jiffies, ifmsh->last_preq +
998 min_preq_int_jiff(sdata))) {
999 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1000 return;
1001 }
1002
1003 preq_node = list_first_entry(&ifmsh->preq_queue.list,
1004 struct mesh_preq_queue, list);
1005 list_del(&preq_node->list);
1006 --ifmsh->preq_queue_len;
1007 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1008
1009 rcu_read_lock();
1010 mpath = mesh_path_lookup(sdata, preq_node->dst);
1011 if (!mpath)
1012 goto enddiscovery;
1013
1014 spin_lock_bh(&mpath->state_lock);
1015 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1016 if (preq_node->flags & PREQ_Q_F_START) {
1017 if (mpath->flags & MESH_PATH_RESOLVING) {
1018 spin_unlock_bh(&mpath->state_lock);
1019 goto enddiscovery;
1020 } else {
1021 mpath->flags &= ~MESH_PATH_RESOLVED;
1022 mpath->flags |= MESH_PATH_RESOLVING;
1023 mpath->discovery_retries = 0;
1024 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1025 }
1026 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1027 mpath->flags & MESH_PATH_RESOLVED) {
1028 mpath->flags &= ~MESH_PATH_RESOLVING;
1029 spin_unlock_bh(&mpath->state_lock);
1030 goto enddiscovery;
1031 }
1032
1033 ifmsh->last_preq = jiffies;
1034
1035 if (time_after(jiffies, ifmsh->last_sn_update +
1036 net_traversal_jiffies(sdata)) ||
1037 time_before(jiffies, ifmsh->last_sn_update)) {
1038 ++ifmsh->sn;
1039 sdata->u.mesh.last_sn_update = jiffies;
1040 }
1041 lifetime = default_lifetime(sdata);
1042 ttl = sdata->u.mesh.mshcfg.element_ttl;
1043 if (ttl == 0) {
1044 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1045 spin_unlock_bh(&mpath->state_lock);
1046 goto enddiscovery;
1047 }
1048
1049 if (preq_node->flags & PREQ_Q_F_REFRESH)
1050 target_flags |= IEEE80211_PREQ_TO_FLAG;
1051 else
1052 target_flags &= ~IEEE80211_PREQ_TO_FLAG;
1053
1054 spin_unlock_bh(&mpath->state_lock);
1055 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1056 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn,
1057 target_flags, mpath->dst, mpath->sn, da, 0,
1058 ttl, lifetime, 0, ifmsh->preq_id++, sdata);
1059 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1060
1061 enddiscovery:
1062 rcu_read_unlock();
1063 kfree(preq_node);
1064 }
1065
1066 /**
1067 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1068 *
1069 * @skb: 802.11 frame to be sent
1070 * @sdata: network subif the frame will be sent through
1071 *
1072 * Lookup next hop for given skb and start path discovery if no
1073 * forwarding information is found.
1074 *
1075 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1076 * skb is freeed here if no mpath could be allocated.
1077 */
1078 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1079 struct sk_buff *skb)
1080 {
1081 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1082 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1083 struct mesh_path *mpath;
1084 struct sk_buff *skb_to_free = NULL;
1085 u8 *target_addr = hdr->addr3;
1086 int err = 0;
1087
1088 /* Nulls are only sent to peers for PS and should be pre-addressed */
1089 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1090 return 0;
1091
1092 rcu_read_lock();
1093 err = mesh_nexthop_lookup(sdata, skb);
1094 if (!err)
1095 goto endlookup;
1096
1097 /* no nexthop found, start resolving */
1098 mpath = mesh_path_lookup(sdata, target_addr);
1099 if (!mpath) {
1100 mpath = mesh_path_add(sdata, target_addr);
1101 if (IS_ERR(mpath)) {
1102 mesh_path_discard_frame(sdata, skb);
1103 err = PTR_ERR(mpath);
1104 goto endlookup;
1105 }
1106 }
1107
1108 if (!(mpath->flags & MESH_PATH_RESOLVING))
1109 mesh_queue_preq(mpath, PREQ_Q_F_START);
1110
1111 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1112 skb_to_free = skb_dequeue(&mpath->frame_queue);
1113
1114 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1115 ieee80211_set_qos_hdr(sdata, skb);
1116 skb_queue_tail(&mpath->frame_queue, skb);
1117 err = -ENOENT;
1118 if (skb_to_free)
1119 mesh_path_discard_frame(sdata, skb_to_free);
1120
1121 endlookup:
1122 rcu_read_unlock();
1123 return err;
1124 }
1125
1126 /**
1127 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1128 * this function is considered "using" the associated mpath, so preempt a path
1129 * refresh if this mpath expires soon.
1130 *
1131 * @skb: 802.11 frame to be sent
1132 * @sdata: network subif the frame will be sent through
1133 *
1134 * Returns: 0 if the next hop was found. Nonzero otherwise.
1135 */
1136 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1137 struct sk_buff *skb)
1138 {
1139 struct mesh_path *mpath;
1140 struct sta_info *next_hop;
1141 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1142 u8 *target_addr = hdr->addr3;
1143 int err = -ENOENT;
1144
1145 rcu_read_lock();
1146 mpath = mesh_path_lookup(sdata, target_addr);
1147
1148 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1149 goto endlookup;
1150
1151 if (time_after(jiffies,
1152 mpath->exp_time -
1153 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1154 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
1155 !(mpath->flags & MESH_PATH_RESOLVING) &&
1156 !(mpath->flags & MESH_PATH_FIXED))
1157 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1158
1159 next_hop = rcu_dereference(mpath->next_hop);
1160 if (next_hop) {
1161 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1162 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1163 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
1164 err = 0;
1165 }
1166
1167 endlookup:
1168 rcu_read_unlock();
1169 return err;
1170 }
1171
1172 void mesh_path_timer(unsigned long data)
1173 {
1174 struct mesh_path *mpath = (void *) data;
1175 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1176 int ret;
1177
1178 if (sdata->local->quiescing)
1179 return;
1180
1181 spin_lock_bh(&mpath->state_lock);
1182 if (mpath->flags & MESH_PATH_RESOLVED ||
1183 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1184 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1185 spin_unlock_bh(&mpath->state_lock);
1186 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1187 ++mpath->discovery_retries;
1188 mpath->discovery_timeout *= 2;
1189 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1190 spin_unlock_bh(&mpath->state_lock);
1191 mesh_queue_preq(mpath, 0);
1192 } else {
1193 mpath->flags &= ~(MESH_PATH_RESOLVING |
1194 MESH_PATH_RESOLVED |
1195 MESH_PATH_REQ_QUEUED);
1196 mpath->exp_time = jiffies;
1197 spin_unlock_bh(&mpath->state_lock);
1198 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1199 ret = mesh_path_send_to_gates(mpath);
1200 if (ret)
1201 mhwmp_dbg(sdata, "no gate was reachable\n");
1202 } else
1203 mesh_path_flush_pending(mpath);
1204 }
1205 }
1206
1207 void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1208 {
1209 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1210 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1211 u8 flags, target_flags = 0;
1212
1213 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1214 ? RANN_FLAG_IS_GATE : 0;
1215
1216 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1217 case IEEE80211_PROACTIVE_RANN:
1218 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1219 ++ifmsh->sn, 0, NULL, 0, broadcast_addr,
1220 0, ifmsh->mshcfg.element_ttl,
1221 interval, 0, 0, sdata);
1222 break;
1223 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1224 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1225 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1226 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1227 target_flags |= IEEE80211_PREQ_TO_FLAG |
1228 IEEE80211_PREQ_USN_FLAG;
1229 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1230 ++ifmsh->sn, target_flags,
1231 (u8 *) broadcast_addr, 0, broadcast_addr,
1232 0, ifmsh->mshcfg.element_ttl, interval,
1233 0, ifmsh->preq_id++, sdata);
1234 break;
1235 default:
1236 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
1237 return;
1238 }
1239 }
Linux with added FPC-III support