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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[linux/fpc-iii.git] / net / mac80211 / mesh_hwmp.c
blob2659e428b80c86cf367a75b034c8d89a856f28a1
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(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 u32 u16_field_get(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 u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target,
106 __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl,
107 __le32 lifetime, __le32 metric, __le32 preq_id,
108 struct ieee80211_sub_if_data *sdata)
109 {
110 struct ieee80211_local *local = sdata->local;
111 struct sk_buff *skb;
112 struct ieee80211_mgmt *mgmt;
113 u8 *pos, ie_len;
114 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
115 sizeof(mgmt->u.action.u.mesh_action);
116
117 skb = dev_alloc_skb(local->tx_headroom +
118 hdr_len +
119 2 + 37); /* max HWMP IE */
120 if (!skb)
121 return -1;
122 skb_reserve(skb, local->tx_headroom);
123 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
124 memset(mgmt, 0, hdr_len);
125 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
126 IEEE80211_STYPE_ACTION);
127
128 memcpy(mgmt->da, da, ETH_ALEN);
129 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
130 /* BSSID == SA */
131 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
132 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
133 mgmt->u.action.u.mesh_action.action_code =
134 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
135
136 switch (action) {
137 case MPATH_PREQ:
138 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
139 ie_len = 37;
140 pos = skb_put(skb, 2 + ie_len);
141 *pos++ = WLAN_EID_PREQ;
142 break;
143 case MPATH_PREP:
144 mhwmp_dbg(sdata, "sending PREP to %pM\n", target);
145 ie_len = 31;
146 pos = skb_put(skb, 2 + ie_len);
147 *pos++ = WLAN_EID_PREP;
148 break;
149 case MPATH_RANN:
150 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
151 ie_len = sizeof(struct ieee80211_rann_ie);
152 pos = skb_put(skb, 2 + ie_len);
153 *pos++ = WLAN_EID_RANN;
154 break;
155 default:
156 kfree_skb(skb);
157 return -ENOTSUPP;
158 break;
159 }
160 *pos++ = ie_len;
161 *pos++ = flags;
162 *pos++ = hop_count;
163 *pos++ = ttl;
164 if (action == MPATH_PREP) {
165 memcpy(pos, target, ETH_ALEN);
166 pos += ETH_ALEN;
167 memcpy(pos, &target_sn, 4);
168 pos += 4;
169 } else {
170 if (action == MPATH_PREQ) {
171 memcpy(pos, &preq_id, 4);
172 pos += 4;
173 }
174 memcpy(pos, orig_addr, ETH_ALEN);
175 pos += ETH_ALEN;
176 memcpy(pos, &orig_sn, 4);
177 pos += 4;
178 }
179 memcpy(pos, &lifetime, 4); /* interval for RANN */
180 pos += 4;
181 memcpy(pos, &metric, 4);
182 pos += 4;
183 if (action == MPATH_PREQ) {
184 *pos++ = 1; /* destination count */
185 *pos++ = target_flags;
186 memcpy(pos, target, ETH_ALEN);
187 pos += ETH_ALEN;
188 memcpy(pos, &target_sn, 4);
189 pos += 4;
190 } else if (action == MPATH_PREP) {
191 memcpy(pos, orig_addr, ETH_ALEN);
192 pos += ETH_ALEN;
193 memcpy(pos, &orig_sn, 4);
194 pos += 4;
195 }
196
197 ieee80211_tx_skb(sdata, skb);
198 return 0;
199 }
200
201
202 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
203 * headroom in case the frame is encrypted. */
204 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
205 struct sk_buff *skb)
206 {
207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
208
209 skb_set_mac_header(skb, 0);
210 skb_set_network_header(skb, 0);
211 skb_set_transport_header(skb, 0);
212
213 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
214 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
215 skb->priority = 7;
216
217 info->control.vif = &sdata->vif;
218 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
219 ieee80211_set_qos_hdr(sdata, skb);
220 }
221
222 /**
223 * mesh_send_path error - Sends a PERR mesh management frame
224 *
225 * @target: broken destination
226 * @target_sn: SN of the broken destination
227 * @target_rcode: reason code for this PERR
228 * @ra: node this frame is addressed to
229 *
230 * Note: This function may be called with driver locks taken that the driver
231 * also acquires in the TX path. To avoid a deadlock we don't transmit the
232 * frame directly but add it to the pending queue instead.
233 */
234 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
235 __le16 target_rcode, const u8 *ra,
236 struct ieee80211_sub_if_data *sdata)
237 {
238 struct ieee80211_local *local = sdata->local;
239 struct sk_buff *skb;
240 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
241 struct ieee80211_mgmt *mgmt;
242 u8 *pos, ie_len;
243 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
244 sizeof(mgmt->u.action.u.mesh_action);
245
246 if (time_before(jiffies, ifmsh->next_perr))
247 return -EAGAIN;
248
249 skb = dev_alloc_skb(local->tx_headroom +
250 IEEE80211_ENCRYPT_HEADROOM +
251 IEEE80211_ENCRYPT_TAILROOM +
252 hdr_len +
253 2 + 15 /* PERR IE */);
254 if (!skb)
255 return -1;
256 skb_reserve(skb, local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
257 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
258 memset(mgmt, 0, hdr_len);
259 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
260 IEEE80211_STYPE_ACTION);
261
262 memcpy(mgmt->da, ra, ETH_ALEN);
263 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
264 /* BSSID == SA */
265 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
266 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
267 mgmt->u.action.u.mesh_action.action_code =
268 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
269 ie_len = 15;
270 pos = skb_put(skb, 2 + ie_len);
271 *pos++ = WLAN_EID_PERR;
272 *pos++ = ie_len;
273 /* ttl */
274 *pos++ = ttl;
275 /* number of destinations */
276 *pos++ = 1;
277 /*
278 * flags bit, bit 1 is unset if we know the sequence number and
279 * bit 2 is set if we have a reason code
280 */
281 *pos = 0;
282 if (!target_sn)
283 *pos |= MP_F_USN;
284 if (target_rcode)
285 *pos |= MP_F_RCODE;
286 pos++;
287 memcpy(pos, target, ETH_ALEN);
288 pos += ETH_ALEN;
289 memcpy(pos, &target_sn, 4);
290 pos += 4;
291 memcpy(pos, &target_rcode, 2);
292
293 /* see note in function header */
294 prepare_frame_for_deferred_tx(sdata, skb);
295 ifmsh->next_perr = TU_TO_EXP_TIME(
296 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
297 ieee80211_add_pending_skb(local, skb);
298 return 0;
299 }
300
301 void ieee80211s_update_metric(struct ieee80211_local *local,
302 struct sta_info *sta, struct sk_buff *skb)
303 {
304 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
305 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
306 int failed;
307
308 if (!ieee80211_is_data(hdr->frame_control))
309 return;
310
311 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
312
313 /* moving average, scaled to 100 */
314 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed);
315 if (sta->fail_avg > 95)
316 mesh_plink_broken(sta);
317 }
318
319 static u32 airtime_link_metric_get(struct ieee80211_local *local,
320 struct sta_info *sta)
321 {
322 struct rate_info rinfo;
323 /* This should be adjusted for each device */
324 int device_constant = 1 << ARITH_SHIFT;
325 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
326 int s_unit = 1 << ARITH_SHIFT;
327 int rate, err;
328 u32 tx_time, estimated_retx;
329 u64 result;
330
331 if (sta->fail_avg >= 100)
332 return MAX_METRIC;
333
334 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
335 rate = cfg80211_calculate_bitrate(&rinfo);
336 if (WARN_ON(!rate))
337 return MAX_METRIC;
338
339 err = (sta->fail_avg << ARITH_SHIFT) / 100;
340
341 /* bitrate is in units of 100 Kbps, while we need rate in units of
342 * 1Mbps. This will be corrected on tx_time computation.
343 */
344 tx_time = (device_constant + 10 * test_frame_len / rate);
345 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
346 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
347 return (u32)result;
348 }
349
350 /**
351 * hwmp_route_info_get - Update routing info to originator and transmitter
352 *
353 * @sdata: local mesh subif
354 * @mgmt: mesh management frame
355 * @hwmp_ie: hwmp information element (PREP or PREQ)
356 *
357 * This function updates the path routing information to the originator and the
358 * transmitter of a HWMP PREQ or PREP frame.
359 *
360 * Returns: metric to frame originator or 0 if the frame should not be further
361 * processed
362 *
363 * Notes: this function is the only place (besides user-provided info) where
364 * path routing information is updated.
365 */
366 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
367 struct ieee80211_mgmt *mgmt,
368 u8 *hwmp_ie, enum mpath_frame_type action)
369 {
370 struct ieee80211_local *local = sdata->local;
371 struct mesh_path *mpath;
372 struct sta_info *sta;
373 bool fresh_info;
374 u8 *orig_addr, *ta;
375 u32 orig_sn, orig_metric;
376 unsigned long orig_lifetime, exp_time;
377 u32 last_hop_metric, new_metric;
378 bool process = true;
379
380 rcu_read_lock();
381 sta = sta_info_get(sdata, mgmt->sa);
382 if (!sta) {
383 rcu_read_unlock();
384 return 0;
385 }
386
387 last_hop_metric = airtime_link_metric_get(local, sta);
388 /* Update and check originator routing info */
389 fresh_info = true;
390
391 switch (action) {
392 case MPATH_PREQ:
393 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
394 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
395 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
396 orig_metric = PREQ_IE_METRIC(hwmp_ie);
397 break;
398 case MPATH_PREP:
399 /* Originator here refers to the MP that was the target in the
400 * Path Request. We divert from the nomenclature in the draft
401 * so that we can easily use a single function to gather path
402 * information from both PREQ and PREP frames.
403 */
404 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
405 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
406 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
407 orig_metric = PREP_IE_METRIC(hwmp_ie);
408 break;
409 default:
410 rcu_read_unlock();
411 return 0;
412 }
413 new_metric = orig_metric + last_hop_metric;
414 if (new_metric < orig_metric)
415 new_metric = MAX_METRIC;
416 exp_time = TU_TO_EXP_TIME(orig_lifetime);
417
418 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
419 /* This MP is the originator, we are not interested in this
420 * frame, except for updating transmitter's path info.
421 */
422 process = false;
423 fresh_info = false;
424 } else {
425 mpath = mesh_path_lookup(orig_addr, sdata);
426 if (mpath) {
427 spin_lock_bh(&mpath->state_lock);
428 if (mpath->flags & MESH_PATH_FIXED)
429 fresh_info = false;
430 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
431 (mpath->flags & MESH_PATH_SN_VALID)) {
432 if (SN_GT(mpath->sn, orig_sn) ||
433 (mpath->sn == orig_sn &&
434 new_metric >= mpath->metric)) {
435 process = false;
436 fresh_info = false;
437 }
438 }
439 } else {
440 mesh_path_add(orig_addr, sdata);
441 mpath = mesh_path_lookup(orig_addr, sdata);
442 if (!mpath) {
443 rcu_read_unlock();
444 return 0;
445 }
446 spin_lock_bh(&mpath->state_lock);
447 }
448
449 if (fresh_info) {
450 mesh_path_assign_nexthop(mpath, sta);
451 mpath->flags |= MESH_PATH_SN_VALID;
452 mpath->metric = new_metric;
453 mpath->sn = orig_sn;
454 mpath->exp_time = time_after(mpath->exp_time, exp_time)
455 ? mpath->exp_time : exp_time;
456 mesh_path_activate(mpath);
457 spin_unlock_bh(&mpath->state_lock);
458 mesh_path_tx_pending(mpath);
459 /* draft says preq_id should be saved to, but there does
460 * not seem to be any use for it, skipping by now
461 */
462 } else
463 spin_unlock_bh(&mpath->state_lock);
464 }
465
466 /* Update and check transmitter routing info */
467 ta = mgmt->sa;
468 if (ether_addr_equal(orig_addr, ta))
469 fresh_info = false;
470 else {
471 fresh_info = true;
472
473 mpath = mesh_path_lookup(ta, sdata);
474 if (mpath) {
475 spin_lock_bh(&mpath->state_lock);
476 if ((mpath->flags & MESH_PATH_FIXED) ||
477 ((mpath->flags & MESH_PATH_ACTIVE) &&
478 (last_hop_metric > mpath->metric)))
479 fresh_info = false;
480 } else {
481 mesh_path_add(ta, sdata);
482 mpath = mesh_path_lookup(ta, sdata);
483 if (!mpath) {
484 rcu_read_unlock();
485 return 0;
486 }
487 spin_lock_bh(&mpath->state_lock);
488 }
489
490 if (fresh_info) {
491 mesh_path_assign_nexthop(mpath, sta);
492 mpath->metric = last_hop_metric;
493 mpath->exp_time = time_after(mpath->exp_time, exp_time)
494 ? mpath->exp_time : exp_time;
495 mesh_path_activate(mpath);
496 spin_unlock_bh(&mpath->state_lock);
497 mesh_path_tx_pending(mpath);
498 } else
499 spin_unlock_bh(&mpath->state_lock);
500 }
501
502 rcu_read_unlock();
503
504 return process ? new_metric : 0;
505 }
506
507 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
508 struct ieee80211_mgmt *mgmt,
509 u8 *preq_elem, u32 metric)
510 {
511 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
512 struct mesh_path *mpath = NULL;
513 u8 *target_addr, *orig_addr;
514 const u8 *da;
515 u8 target_flags, ttl, flags;
516 u32 orig_sn, target_sn, lifetime, orig_metric;
517 bool reply = false;
518 bool forward = true;
519 bool root_is_gate;
520
521 /* Update target SN, if present */
522 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
523 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
524 target_sn = PREQ_IE_TARGET_SN(preq_elem);
525 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
526 target_flags = PREQ_IE_TARGET_F(preq_elem);
527 orig_metric = metric;
528 /* Proactive PREQ gate announcements */
529 flags = PREQ_IE_FLAGS(preq_elem);
530 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
531
532 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
533
534 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
535 mhwmp_dbg(sdata, "PREQ is for us\n");
536 forward = false;
537 reply = true;
538 metric = 0;
539 if (time_after(jiffies, ifmsh->last_sn_update +
540 net_traversal_jiffies(sdata)) ||
541 time_before(jiffies, ifmsh->last_sn_update)) {
542 target_sn = ++ifmsh->sn;
543 ifmsh->last_sn_update = jiffies;
544 }
545 } else if (is_broadcast_ether_addr(target_addr) &&
546 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
547 rcu_read_lock();
548 mpath = mesh_path_lookup(orig_addr, sdata);
549 if (mpath) {
550 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
551 reply = true;
552 target_addr = sdata->vif.addr;
553 target_sn = ++ifmsh->sn;
554 metric = 0;
555 ifmsh->last_sn_update = jiffies;
556 }
557 if (root_is_gate)
558 mesh_path_add_gate(mpath);
559 }
560 rcu_read_unlock();
561 } else {
562 rcu_read_lock();
563 mpath = mesh_path_lookup(target_addr, sdata);
564 if (mpath) {
565 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
566 SN_LT(mpath->sn, target_sn)) {
567 mpath->sn = target_sn;
568 mpath->flags |= MESH_PATH_SN_VALID;
569 } else if ((!(target_flags & MP_F_DO)) &&
570 (mpath->flags & MESH_PATH_ACTIVE)) {
571 reply = true;
572 metric = mpath->metric;
573 target_sn = mpath->sn;
574 if (target_flags & MP_F_RF)
575 target_flags |= MP_F_DO;
576 else
577 forward = false;
578 }
579 }
580 rcu_read_unlock();
581 }
582
583 if (reply) {
584 lifetime = PREQ_IE_LIFETIME(preq_elem);
585 ttl = ifmsh->mshcfg.element_ttl;
586 if (ttl != 0) {
587 mhwmp_dbg(sdata, "replying to the PREQ\n");
588 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
589 cpu_to_le32(orig_sn), 0, target_addr,
590 cpu_to_le32(target_sn), mgmt->sa, 0, ttl,
591 cpu_to_le32(lifetime), cpu_to_le32(metric),
592 0, sdata);
593 } else {
594 ifmsh->mshstats.dropped_frames_ttl++;
595 }
596 }
597
598 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
599 u32 preq_id;
600 u8 hopcount;
601
602 ttl = PREQ_IE_TTL(preq_elem);
603 lifetime = PREQ_IE_LIFETIME(preq_elem);
604 if (ttl <= 1) {
605 ifmsh->mshstats.dropped_frames_ttl++;
606 return;
607 }
608 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
609 --ttl;
610 preq_id = PREQ_IE_PREQ_ID(preq_elem);
611 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
612 da = (mpath && mpath->is_root) ?
613 mpath->rann_snd_addr : broadcast_addr;
614
615 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
616 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
617 target_sn = PREQ_IE_TARGET_SN(preq_elem);
618 metric = orig_metric;
619 }
620
621 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
622 cpu_to_le32(orig_sn), target_flags, target_addr,
623 cpu_to_le32(target_sn), da,
624 hopcount, ttl, cpu_to_le32(lifetime),
625 cpu_to_le32(metric), cpu_to_le32(preq_id),
626 sdata);
627 if (!is_multicast_ether_addr(da))
628 ifmsh->mshstats.fwded_unicast++;
629 else
630 ifmsh->mshstats.fwded_mcast++;
631 ifmsh->mshstats.fwded_frames++;
632 }
633 }
634
635
636 static inline struct sta_info *
637 next_hop_deref_protected(struct mesh_path *mpath)
638 {
639 return rcu_dereference_protected(mpath->next_hop,
640 lockdep_is_held(&mpath->state_lock));
641 }
642
643
644 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
645 struct ieee80211_mgmt *mgmt,
646 u8 *prep_elem, u32 metric)
647 {
648 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
649 struct mesh_path *mpath;
650 u8 *target_addr, *orig_addr;
651 u8 ttl, hopcount, flags;
652 u8 next_hop[ETH_ALEN];
653 u32 target_sn, orig_sn, lifetime;
654
655 mhwmp_dbg(sdata, "received PREP from %pM\n",
656 PREP_IE_ORIG_ADDR(prep_elem));
657
658 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
659 if (ether_addr_equal(orig_addr, sdata->vif.addr))
660 /* destination, no forwarding required */
661 return;
662
663 if (!ifmsh->mshcfg.dot11MeshForwarding)
664 return;
665
666 ttl = PREP_IE_TTL(prep_elem);
667 if (ttl <= 1) {
668 sdata->u.mesh.mshstats.dropped_frames_ttl++;
669 return;
670 }
671
672 rcu_read_lock();
673 mpath = mesh_path_lookup(orig_addr, sdata);
674 if (mpath)
675 spin_lock_bh(&mpath->state_lock);
676 else
677 goto fail;
678 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
679 spin_unlock_bh(&mpath->state_lock);
680 goto fail;
681 }
682 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
683 spin_unlock_bh(&mpath->state_lock);
684 --ttl;
685 flags = PREP_IE_FLAGS(prep_elem);
686 lifetime = PREP_IE_LIFETIME(prep_elem);
687 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
688 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
689 target_sn = PREP_IE_TARGET_SN(prep_elem);
690 orig_sn = PREP_IE_ORIG_SN(prep_elem);
691
692 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
693 cpu_to_le32(orig_sn), 0, target_addr,
694 cpu_to_le32(target_sn), next_hop, hopcount,
695 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
696 0, sdata);
697 rcu_read_unlock();
698
699 sdata->u.mesh.mshstats.fwded_unicast++;
700 sdata->u.mesh.mshstats.fwded_frames++;
701 return;
702
703 fail:
704 rcu_read_unlock();
705 sdata->u.mesh.mshstats.dropped_frames_no_route++;
706 }
707
708 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
709 struct ieee80211_mgmt *mgmt, u8 *perr_elem)
710 {
711 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
712 struct mesh_path *mpath;
713 u8 ttl;
714 u8 *ta, *target_addr;
715 u32 target_sn;
716 u16 target_rcode;
717
718 ta = mgmt->sa;
719 ttl = PERR_IE_TTL(perr_elem);
720 if (ttl <= 1) {
721 ifmsh->mshstats.dropped_frames_ttl++;
722 return;
723 }
724 ttl--;
725 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
726 target_sn = PERR_IE_TARGET_SN(perr_elem);
727 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
728
729 rcu_read_lock();
730 mpath = mesh_path_lookup(target_addr, sdata);
731 if (mpath) {
732 struct sta_info *sta;
733
734 spin_lock_bh(&mpath->state_lock);
735 sta = next_hop_deref_protected(mpath);
736 if (mpath->flags & MESH_PATH_ACTIVE &&
737 ether_addr_equal(ta, sta->sta.addr) &&
738 (!(mpath->flags & MESH_PATH_SN_VALID) ||
739 SN_GT(target_sn, mpath->sn))) {
740 mpath->flags &= ~MESH_PATH_ACTIVE;
741 mpath->sn = target_sn;
742 spin_unlock_bh(&mpath->state_lock);
743 if (!ifmsh->mshcfg.dot11MeshForwarding)
744 goto endperr;
745 mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn),
746 cpu_to_le16(target_rcode),
747 broadcast_addr, sdata);
748 } else
749 spin_unlock_bh(&mpath->state_lock);
750 }
751 endperr:
752 rcu_read_unlock();
753 }
754
755 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
756 struct ieee80211_mgmt *mgmt,
757 struct ieee80211_rann_ie *rann)
758 {
759 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
760 struct ieee80211_local *local = sdata->local;
761 struct sta_info *sta;
762 struct mesh_path *mpath;
763 u8 ttl, flags, hopcount;
764 u8 *orig_addr;
765 u32 orig_sn, metric, metric_txsta, interval;
766 bool root_is_gate;
767
768 ttl = rann->rann_ttl;
769 flags = rann->rann_flags;
770 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
771 orig_addr = rann->rann_addr;
772 orig_sn = le32_to_cpu(rann->rann_seq);
773 interval = le32_to_cpu(rann->rann_interval);
774 hopcount = rann->rann_hopcount;
775 hopcount++;
776 metric = le32_to_cpu(rann->rann_metric);
777
778 /* Ignore our own RANNs */
779 if (ether_addr_equal(orig_addr, sdata->vif.addr))
780 return;
781
782 mhwmp_dbg(sdata,
783 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
784 orig_addr, mgmt->sa, root_is_gate);
785
786 rcu_read_lock();
787 sta = sta_info_get(sdata, mgmt->sa);
788 if (!sta) {
789 rcu_read_unlock();
790 return;
791 }
792
793 metric_txsta = airtime_link_metric_get(local, sta);
794
795 mpath = mesh_path_lookup(orig_addr, sdata);
796 if (!mpath) {
797 mesh_path_add(orig_addr, sdata);
798 mpath = mesh_path_lookup(orig_addr, sdata);
799 if (!mpath) {
800 rcu_read_unlock();
801 sdata->u.mesh.mshstats.dropped_frames_no_route++;
802 return;
803 }
804 }
805
806 if (!(SN_LT(mpath->sn, orig_sn)) &&
807 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
808 rcu_read_unlock();
809 return;
810 }
811
812 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
813 (time_after(jiffies, mpath->last_preq_to_root +
814 root_path_confirmation_jiffies(sdata)) ||
815 time_before(jiffies, mpath->last_preq_to_root))) &&
816 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
817 mhwmp_dbg(sdata,
818 "time to refresh root mpath %pM\n",
819 orig_addr);
820 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
821 mpath->last_preq_to_root = jiffies;
822 }
823
824 mpath->sn = orig_sn;
825 mpath->rann_metric = metric + metric_txsta;
826 mpath->is_root = true;
827 /* Recording RANNs sender address to send individually
828 * addressed PREQs destined for root mesh STA */
829 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
830
831 if (root_is_gate)
832 mesh_path_add_gate(mpath);
833
834 if (ttl <= 1) {
835 ifmsh->mshstats.dropped_frames_ttl++;
836 rcu_read_unlock();
837 return;
838 }
839 ttl--;
840
841 if (ifmsh->mshcfg.dot11MeshForwarding) {
842 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
843 cpu_to_le32(orig_sn),
844 0, NULL, 0, broadcast_addr,
845 hopcount, ttl, cpu_to_le32(interval),
846 cpu_to_le32(metric + metric_txsta),
847 0, sdata);
848 }
849
850 rcu_read_unlock();
851 }
852
853
854 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
855 struct ieee80211_mgmt *mgmt,
856 size_t len)
857 {
858 struct ieee802_11_elems elems;
859 size_t baselen;
860 u32 last_hop_metric;
861 struct sta_info *sta;
862
863 /* need action_code */
864 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
865 return;
866
867 rcu_read_lock();
868 sta = sta_info_get(sdata, mgmt->sa);
869 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) {
870 rcu_read_unlock();
871 return;
872 }
873 rcu_read_unlock();
874
875 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
876 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
877 len - baselen, &elems);
878
879 if (elems.preq) {
880 if (elems.preq_len != 37)
881 /* Right now we support just 1 destination and no AE */
882 return;
883 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
884 MPATH_PREQ);
885 if (last_hop_metric)
886 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
887 last_hop_metric);
888 }
889 if (elems.prep) {
890 if (elems.prep_len != 31)
891 /* Right now we support no AE */
892 return;
893 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
894 MPATH_PREP);
895 if (last_hop_metric)
896 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
897 last_hop_metric);
898 }
899 if (elems.perr) {
900 if (elems.perr_len != 15)
901 /* Right now we support only one destination per PERR */
902 return;
903 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
904 }
905 if (elems.rann)
906 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
907 }
908
909 /**
910 * mesh_queue_preq - queue a PREQ to a given destination
911 *
912 * @mpath: mesh path to discover
913 * @flags: special attributes of the PREQ to be sent
914 *
915 * Locking: the function must be called from within a rcu read lock block.
916 *
917 */
918 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
919 {
920 struct ieee80211_sub_if_data *sdata = mpath->sdata;
921 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
922 struct mesh_preq_queue *preq_node;
923
924 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
925 if (!preq_node) {
926 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
927 return;
928 }
929
930 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
931 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
932 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
933 kfree(preq_node);
934 if (printk_ratelimit())
935 mhwmp_dbg(sdata, "PREQ node queue full\n");
936 return;
937 }
938
939 spin_lock(&mpath->state_lock);
940 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
941 spin_unlock(&mpath->state_lock);
942 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
943 kfree(preq_node);
944 return;
945 }
946
947 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
948 preq_node->flags = flags;
949
950 mpath->flags |= MESH_PATH_REQ_QUEUED;
951 spin_unlock(&mpath->state_lock);
952
953 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
954 ++ifmsh->preq_queue_len;
955 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
956
957 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
958 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
959
960 else if (time_before(jiffies, ifmsh->last_preq)) {
961 /* avoid long wait if did not send preqs for a long time
962 * and jiffies wrapped around
963 */
964 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
965 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
966 } else
967 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
968 min_preq_int_jiff(sdata));
969 }
970
971 /**
972 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
973 *
974 * @sdata: local mesh subif
975 */
976 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
977 {
978 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
979 struct mesh_preq_queue *preq_node;
980 struct mesh_path *mpath;
981 u8 ttl, target_flags;
982 const u8 *da;
983 u32 lifetime;
984
985 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
986 if (!ifmsh->preq_queue_len ||
987 time_before(jiffies, ifmsh->last_preq +
988 min_preq_int_jiff(sdata))) {
989 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
990 return;
991 }
992
993 preq_node = list_first_entry(&ifmsh->preq_queue.list,
994 struct mesh_preq_queue, list);
995 list_del(&preq_node->list);
996 --ifmsh->preq_queue_len;
997 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
998
999 rcu_read_lock();
1000 mpath = mesh_path_lookup(preq_node->dst, sdata);
1001 if (!mpath)
1002 goto enddiscovery;
1003
1004 spin_lock_bh(&mpath->state_lock);
1005 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1006 if (preq_node->flags & PREQ_Q_F_START) {
1007 if (mpath->flags & MESH_PATH_RESOLVING) {
1008 spin_unlock_bh(&mpath->state_lock);
1009 goto enddiscovery;
1010 } else {
1011 mpath->flags &= ~MESH_PATH_RESOLVED;
1012 mpath->flags |= MESH_PATH_RESOLVING;
1013 mpath->discovery_retries = 0;
1014 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1015 }
1016 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1017 mpath->flags & MESH_PATH_RESOLVED) {
1018 mpath->flags &= ~MESH_PATH_RESOLVING;
1019 spin_unlock_bh(&mpath->state_lock);
1020 goto enddiscovery;
1021 }
1022
1023 ifmsh->last_preq = jiffies;
1024
1025 if (time_after(jiffies, ifmsh->last_sn_update +
1026 net_traversal_jiffies(sdata)) ||
1027 time_before(jiffies, ifmsh->last_sn_update)) {
1028 ++ifmsh->sn;
1029 sdata->u.mesh.last_sn_update = jiffies;
1030 }
1031 lifetime = default_lifetime(sdata);
1032 ttl = sdata->u.mesh.mshcfg.element_ttl;
1033 if (ttl == 0) {
1034 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1035 spin_unlock_bh(&mpath->state_lock);
1036 goto enddiscovery;
1037 }
1038
1039 if (preq_node->flags & PREQ_Q_F_REFRESH)
1040 target_flags = MP_F_DO;
1041 else
1042 target_flags = MP_F_RF;
1043
1044 spin_unlock_bh(&mpath->state_lock);
1045 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1046 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr,
1047 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
1048 cpu_to_le32(mpath->sn), da, 0,
1049 ttl, cpu_to_le32(lifetime), 0,
1050 cpu_to_le32(ifmsh->preq_id++), sdata);
1051 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1052
1053 enddiscovery:
1054 rcu_read_unlock();
1055 kfree(preq_node);
1056 }
1057
1058 /**
1059 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1060 *
1061 * @skb: 802.11 frame to be sent
1062 * @sdata: network subif the frame will be sent through
1063 *
1064 * Lookup next hop for given skb and start path discovery if no
1065 * forwarding information is found.
1066 *
1067 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1068 * skb is freeed here if no mpath could be allocated.
1069 */
1070 int mesh_nexthop_resolve(struct sk_buff *skb,
1071 struct ieee80211_sub_if_data *sdata)
1072 {
1073 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1074 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1075 struct mesh_path *mpath;
1076 struct sk_buff *skb_to_free = NULL;
1077 u8 *target_addr = hdr->addr3;
1078 int err = 0;
1079
1080 rcu_read_lock();
1081 err = mesh_nexthop_lookup(skb, sdata);
1082 if (!err)
1083 goto endlookup;
1084
1085 /* no nexthop found, start resolving */
1086 mpath = mesh_path_lookup(target_addr, sdata);
1087 if (!mpath) {
1088 mesh_path_add(target_addr, sdata);
1089 mpath = mesh_path_lookup(target_addr, sdata);
1090 if (!mpath) {
1091 mesh_path_discard_frame(skb, sdata);
1092 err = -ENOSPC;
1093 goto endlookup;
1094 }
1095 }
1096
1097 if (!(mpath->flags & MESH_PATH_RESOLVING))
1098 mesh_queue_preq(mpath, PREQ_Q_F_START);
1099
1100 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1101 skb_to_free = skb_dequeue(&mpath->frame_queue);
1102
1103 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1104 ieee80211_set_qos_hdr(sdata, skb);
1105 skb_queue_tail(&mpath->frame_queue, skb);
1106 err = -ENOENT;
1107 if (skb_to_free)
1108 mesh_path_discard_frame(skb_to_free, sdata);
1109
1110 endlookup:
1111 rcu_read_unlock();
1112 return err;
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 sk_buff *skb,
1125 struct ieee80211_sub_if_data *sdata)
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(target_addr, sdata);
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 err = 0;
1152 }
1153
1154 endlookup:
1155 rcu_read_unlock();
1156 return err;
1157 }
1158
1159 void mesh_path_timer(unsigned long data)
1160 {
1161 struct mesh_path *mpath = (void *) data;
1162 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1163 int ret;
1164
1165 if (sdata->local->quiescing)
1166 return;
1167
1168 spin_lock_bh(&mpath->state_lock);
1169 if (mpath->flags & MESH_PATH_RESOLVED ||
1170 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1171 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1172 spin_unlock_bh(&mpath->state_lock);
1173 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1174 ++mpath->discovery_retries;
1175 mpath->discovery_timeout *= 2;
1176 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1177 spin_unlock_bh(&mpath->state_lock);
1178 mesh_queue_preq(mpath, 0);
1179 } else {
1180 mpath->flags = 0;
1181 mpath->exp_time = jiffies;
1182 spin_unlock_bh(&mpath->state_lock);
1183 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1184 ret = mesh_path_send_to_gates(mpath);
1185 if (ret)
1186 mhwmp_dbg(sdata, "no gate was reachable\n");
1187 } else
1188 mesh_path_flush_pending(mpath);
1189 }
1190 }
1191
1192 void
1193 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 cpu_to_le32(++ifmsh->sn),
1206 0, NULL, 0, broadcast_addr,
1207 0, ifmsh->mshcfg.element_ttl,
1208 cpu_to_le32(interval), 0, 0, sdata);
1209 break;
1210 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1211 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1212 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1213 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1214 target_flags |= IEEE80211_PREQ_TO_FLAG |
1215 IEEE80211_PREQ_USN_FLAG;
1216 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1217 cpu_to_le32(++ifmsh->sn), target_flags,
1218 (u8 *) broadcast_addr, 0, broadcast_addr,
1219 0, ifmsh->mshcfg.element_ttl,
1220 cpu_to_le32(interval),
1221 0, cpu_to_le32(ifmsh->preq_id++), sdata);
1222 break;
1223 default:
1224 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
1225 return;
1226 }
1227 }
Linux with added FPC-III support