?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
net/mlx4_en: Fix setting initial MAC address
[linux-2.6/libata-dev.git] / net / mac80211 / mesh_hwmp.c
blobbdb8d3b145870d9f212ca4a0dfc5b3de596f60c0
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 u32 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, __le32 orig_sn,
106 u8 target_flags, const u8 *target,
107 __le32 target_sn, const u8 *da,
108 u8 hop_count, u8 ttl,
109 __le32 lifetime, __le32 metric,
110 __le32 preq_id,
111 struct ieee80211_sub_if_data *sdata)
112 {
113 struct ieee80211_local *local = sdata->local;
114 struct sk_buff *skb;
115 struct ieee80211_mgmt *mgmt;
116 u8 *pos, ie_len;
117 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
118 sizeof(mgmt->u.action.u.mesh_action);
119
120 skb = dev_alloc_skb(local->tx_headroom +
121 hdr_len +
122 2 + 37); /* max HWMP IE */
123 if (!skb)
124 return -1;
125 skb_reserve(skb, local->tx_headroom);
126 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
127 memset(mgmt, 0, hdr_len);
128 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
129 IEEE80211_STYPE_ACTION);
130
131 memcpy(mgmt->da, da, ETH_ALEN);
132 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
133 /* BSSID == SA */
134 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
135 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
136 mgmt->u.action.u.mesh_action.action_code =
137 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
138
139 switch (action) {
140 case MPATH_PREQ:
141 mhwmp_dbg(sdata, "sending PREQ to %pM\n", target);
142 ie_len = 37;
143 pos = skb_put(skb, 2 + ie_len);
144 *pos++ = WLAN_EID_PREQ;
145 break;
146 case MPATH_PREP:
147 mhwmp_dbg(sdata, "sending PREP to %pM\n", target);
148 ie_len = 31;
149 pos = skb_put(skb, 2 + ie_len);
150 *pos++ = WLAN_EID_PREP;
151 break;
152 case MPATH_RANN:
153 mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr);
154 ie_len = sizeof(struct ieee80211_rann_ie);
155 pos = skb_put(skb, 2 + ie_len);
156 *pos++ = WLAN_EID_RANN;
157 break;
158 default:
159 kfree_skb(skb);
160 return -ENOTSUPP;
161 break;
162 }
163 *pos++ = ie_len;
164 *pos++ = flags;
165 *pos++ = hop_count;
166 *pos++ = ttl;
167 if (action == MPATH_PREP) {
168 memcpy(pos, target, ETH_ALEN);
169 pos += ETH_ALEN;
170 memcpy(pos, &target_sn, 4);
171 pos += 4;
172 } else {
173 if (action == MPATH_PREQ) {
174 memcpy(pos, &preq_id, 4);
175 pos += 4;
176 }
177 memcpy(pos, orig_addr, ETH_ALEN);
178 pos += ETH_ALEN;
179 memcpy(pos, &orig_sn, 4);
180 pos += 4;
181 }
182 memcpy(pos, &lifetime, 4); /* interval for RANN */
183 pos += 4;
184 memcpy(pos, &metric, 4);
185 pos += 4;
186 if (action == MPATH_PREQ) {
187 *pos++ = 1; /* destination count */
188 *pos++ = target_flags;
189 memcpy(pos, target, ETH_ALEN);
190 pos += ETH_ALEN;
191 memcpy(pos, &target_sn, 4);
192 pos += 4;
193 } else if (action == MPATH_PREP) {
194 memcpy(pos, orig_addr, ETH_ALEN);
195 pos += ETH_ALEN;
196 memcpy(pos, &orig_sn, 4);
197 pos += 4;
198 }
199
200 ieee80211_tx_skb(sdata, skb);
201 return 0;
202 }
203
204
205 /* Headroom is not adjusted. Caller should ensure that skb has sufficient
206 * headroom in case the frame is encrypted. */
207 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
208 struct sk_buff *skb)
209 {
210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
211 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
212
213 skb_set_mac_header(skb, 0);
214 skb_set_network_header(skb, 0);
215 skb_set_transport_header(skb, 0);
216
217 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
218 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
219 skb->priority = 7;
220
221 info->control.vif = &sdata->vif;
222 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
223 ieee80211_set_qos_hdr(sdata, skb);
224 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
225 }
226
227 /**
228 * mesh_path_error_tx - Sends a PERR mesh management frame
229 *
230 * @ttl: allowed remaining hops
231 * @target: broken destination
232 * @target_sn: SN of the broken destination
233 * @target_rcode: reason code for this PERR
234 * @ra: node this frame is addressed to
235 * @sdata: local mesh subif
236 *
237 * Note: This function may be called with driver locks taken that the driver
238 * also acquires in the TX path. To avoid a deadlock we don't transmit the
239 * frame directly but add it to the pending queue instead.
240 */
241 int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,
242 u8 ttl, const u8 *target, __le32 target_sn,
243 __le16 target_rcode, const u8 *ra)
244 {
245 struct ieee80211_local *local = sdata->local;
246 struct sk_buff *skb;
247 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
248 struct ieee80211_mgmt *mgmt;
249 u8 *pos, ie_len;
250 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
251 sizeof(mgmt->u.action.u.mesh_action);
252
253 if (time_before(jiffies, ifmsh->next_perr))
254 return -EAGAIN;
255
256 skb = dev_alloc_skb(local->tx_headroom +
257 IEEE80211_ENCRYPT_HEADROOM +
258 IEEE80211_ENCRYPT_TAILROOM +
259 hdr_len +
260 2 + 15 /* PERR IE */);
261 if (!skb)
262 return -1;
263 skb_reserve(skb, local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
264 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
265 memset(mgmt, 0, hdr_len);
266 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
267 IEEE80211_STYPE_ACTION);
268
269 memcpy(mgmt->da, ra, ETH_ALEN);
270 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
271 /* BSSID == SA */
272 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
273 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
274 mgmt->u.action.u.mesh_action.action_code =
275 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
276 ie_len = 15;
277 pos = skb_put(skb, 2 + ie_len);
278 *pos++ = WLAN_EID_PERR;
279 *pos++ = ie_len;
280 /* ttl */
281 *pos++ = ttl;
282 /* number of destinations */
283 *pos++ = 1;
284 /*
285 * flags bit, bit 1 is unset if we know the sequence number and
286 * bit 2 is set if we have a reason code
287 */
288 *pos = 0;
289 if (!target_sn)
290 *pos |= MP_F_USN;
291 if (target_rcode)
292 *pos |= MP_F_RCODE;
293 pos++;
294 memcpy(pos, target, ETH_ALEN);
295 pos += ETH_ALEN;
296 memcpy(pos, &target_sn, 4);
297 pos += 4;
298 memcpy(pos, &target_rcode, 2);
299
300 /* see note in function header */
301 prepare_frame_for_deferred_tx(sdata, skb);
302 ifmsh->next_perr = TU_TO_EXP_TIME(
303 ifmsh->mshcfg.dot11MeshHWMPperrMinInterval);
304 ieee80211_add_pending_skb(local, skb);
305 return 0;
306 }
307
308 void ieee80211s_update_metric(struct ieee80211_local *local,
309 struct sta_info *sta, struct sk_buff *skb)
310 {
311 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
312 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
313 int failed;
314
315 if (!ieee80211_is_data(hdr->frame_control))
316 return;
317
318 failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
319
320 /* moving average, scaled to 100 */
321 sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed);
322 if (sta->fail_avg > 95)
323 mesh_plink_broken(sta);
324 }
325
326 static u32 airtime_link_metric_get(struct ieee80211_local *local,
327 struct sta_info *sta)
328 {
329 struct rate_info rinfo;
330 /* This should be adjusted for each device */
331 int device_constant = 1 << ARITH_SHIFT;
332 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
333 int s_unit = 1 << ARITH_SHIFT;
334 int rate, err;
335 u32 tx_time, estimated_retx;
336 u64 result;
337
338 if (sta->fail_avg >= 100)
339 return MAX_METRIC;
340
341 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
342 rate = cfg80211_calculate_bitrate(&rinfo);
343 if (WARN_ON(!rate))
344 return MAX_METRIC;
345
346 err = (sta->fail_avg << ARITH_SHIFT) / 100;
347
348 /* bitrate is in units of 100 Kbps, while we need rate in units of
349 * 1Mbps. This will be corrected on tx_time computation.
350 */
351 tx_time = (device_constant + 10 * test_frame_len / rate);
352 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
353 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
354 return (u32)result;
355 }
356
357 /**
358 * hwmp_route_info_get - Update routing info to originator and transmitter
359 *
360 * @sdata: local mesh subif
361 * @mgmt: mesh management frame
362 * @hwmp_ie: hwmp information element (PREP or PREQ)
363 * @action: type of hwmp ie
364 *
365 * This function updates the path routing information to the originator and the
366 * transmitter of a HWMP PREQ or PREP frame.
367 *
368 * Returns: metric to frame originator or 0 if the frame should not be further
369 * processed
370 *
371 * Notes: this function is the only place (besides user-provided info) where
372 * path routing information is updated.
373 */
374 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
375 struct ieee80211_mgmt *mgmt,
376 const u8 *hwmp_ie, enum mpath_frame_type action)
377 {
378 struct ieee80211_local *local = sdata->local;
379 struct mesh_path *mpath;
380 struct sta_info *sta;
381 bool fresh_info;
382 const u8 *orig_addr, *ta;
383 u32 orig_sn, orig_metric;
384 unsigned long orig_lifetime, exp_time;
385 u32 last_hop_metric, new_metric;
386 bool process = true;
387
388 rcu_read_lock();
389 sta = sta_info_get(sdata, mgmt->sa);
390 if (!sta) {
391 rcu_read_unlock();
392 return 0;
393 }
394
395 last_hop_metric = airtime_link_metric_get(local, sta);
396 /* Update and check originator routing info */
397 fresh_info = true;
398
399 switch (action) {
400 case MPATH_PREQ:
401 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
402 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
403 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
404 orig_metric = PREQ_IE_METRIC(hwmp_ie);
405 break;
406 case MPATH_PREP:
407 /* Originator here refers to the MP that was the target in the
408 * Path Request. We divert from the nomenclature in the draft
409 * so that we can easily use a single function to gather path
410 * information from both PREQ and PREP frames.
411 */
412 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
413 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
414 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
415 orig_metric = PREP_IE_METRIC(hwmp_ie);
416 break;
417 default:
418 rcu_read_unlock();
419 return 0;
420 }
421 new_metric = orig_metric + last_hop_metric;
422 if (new_metric < orig_metric)
423 new_metric = MAX_METRIC;
424 exp_time = TU_TO_EXP_TIME(orig_lifetime);
425
426 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
427 /* This MP is the originator, we are not interested in this
428 * frame, except for updating transmitter's path info.
429 */
430 process = false;
431 fresh_info = false;
432 } else {
433 mpath = mesh_path_lookup(sdata, orig_addr);
434 if (mpath) {
435 spin_lock_bh(&mpath->state_lock);
436 if (mpath->flags & MESH_PATH_FIXED)
437 fresh_info = false;
438 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
439 (mpath->flags & MESH_PATH_SN_VALID)) {
440 if (SN_GT(mpath->sn, orig_sn) ||
441 (mpath->sn == orig_sn &&
442 new_metric >= mpath->metric)) {
443 process = false;
444 fresh_info = false;
445 }
446 }
447 } else {
448 mesh_path_add(sdata, orig_addr);
449 mpath = mesh_path_lookup(sdata, orig_addr);
450 if (!mpath) {
451 rcu_read_unlock();
452 return 0;
453 }
454 spin_lock_bh(&mpath->state_lock);
455 }
456
457 if (fresh_info) {
458 mesh_path_assign_nexthop(mpath, sta);
459 mpath->flags |= MESH_PATH_SN_VALID;
460 mpath->metric = new_metric;
461 mpath->sn = orig_sn;
462 mpath->exp_time = time_after(mpath->exp_time, exp_time)
463 ? mpath->exp_time : exp_time;
464 mesh_path_activate(mpath);
465 spin_unlock_bh(&mpath->state_lock);
466 mesh_path_tx_pending(mpath);
467 /* draft says preq_id should be saved to, but there does
468 * not seem to be any use for it, skipping by now
469 */
470 } else
471 spin_unlock_bh(&mpath->state_lock);
472 }
473
474 /* Update and check transmitter routing info */
475 ta = mgmt->sa;
476 if (ether_addr_equal(orig_addr, ta))
477 fresh_info = false;
478 else {
479 fresh_info = true;
480
481 mpath = mesh_path_lookup(sdata, ta);
482 if (mpath) {
483 spin_lock_bh(&mpath->state_lock);
484 if ((mpath->flags & MESH_PATH_FIXED) ||
485 ((mpath->flags & MESH_PATH_ACTIVE) &&
486 (last_hop_metric > mpath->metric)))
487 fresh_info = false;
488 } else {
489 mesh_path_add(sdata, ta);
490 mpath = mesh_path_lookup(sdata, ta);
491 if (!mpath) {
492 rcu_read_unlock();
493 return 0;
494 }
495 spin_lock_bh(&mpath->state_lock);
496 }
497
498 if (fresh_info) {
499 mesh_path_assign_nexthop(mpath, sta);
500 mpath->metric = last_hop_metric;
501 mpath->exp_time = time_after(mpath->exp_time, exp_time)
502 ? mpath->exp_time : exp_time;
503 mesh_path_activate(mpath);
504 spin_unlock_bh(&mpath->state_lock);
505 mesh_path_tx_pending(mpath);
506 } else
507 spin_unlock_bh(&mpath->state_lock);
508 }
509
510 rcu_read_unlock();
511
512 return process ? new_metric : 0;
513 }
514
515 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
516 struct ieee80211_mgmt *mgmt,
517 const u8 *preq_elem, u32 metric)
518 {
519 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
520 struct mesh_path *mpath = NULL;
521 const u8 *target_addr, *orig_addr;
522 const u8 *da;
523 u8 target_flags, ttl, flags;
524 u32 orig_sn, target_sn, lifetime, orig_metric;
525 bool reply = false;
526 bool forward = true;
527 bool root_is_gate;
528
529 /* Update target SN, if present */
530 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
531 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
532 target_sn = PREQ_IE_TARGET_SN(preq_elem);
533 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
534 target_flags = PREQ_IE_TARGET_F(preq_elem);
535 orig_metric = metric;
536 /* Proactive PREQ gate announcements */
537 flags = PREQ_IE_FLAGS(preq_elem);
538 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
539
540 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
541
542 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
543 mhwmp_dbg(sdata, "PREQ is for us\n");
544 forward = false;
545 reply = true;
546 metric = 0;
547 if (time_after(jiffies, ifmsh->last_sn_update +
548 net_traversal_jiffies(sdata)) ||
549 time_before(jiffies, ifmsh->last_sn_update)) {
550 target_sn = ++ifmsh->sn;
551 ifmsh->last_sn_update = jiffies;
552 }
553 } else if (is_broadcast_ether_addr(target_addr) &&
554 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
555 rcu_read_lock();
556 mpath = mesh_path_lookup(sdata, orig_addr);
557 if (mpath) {
558 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
559 reply = true;
560 target_addr = sdata->vif.addr;
561 target_sn = ++ifmsh->sn;
562 metric = 0;
563 ifmsh->last_sn_update = jiffies;
564 }
565 if (root_is_gate)
566 mesh_path_add_gate(mpath);
567 }
568 rcu_read_unlock();
569 } else {
570 rcu_read_lock();
571 mpath = mesh_path_lookup(sdata, target_addr);
572 if (mpath) {
573 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
574 SN_LT(mpath->sn, target_sn)) {
575 mpath->sn = target_sn;
576 mpath->flags |= MESH_PATH_SN_VALID;
577 } else if ((!(target_flags & MP_F_DO)) &&
578 (mpath->flags & MESH_PATH_ACTIVE)) {
579 reply = true;
580 metric = mpath->metric;
581 target_sn = mpath->sn;
582 if (target_flags & MP_F_RF)
583 target_flags |= MP_F_DO;
584 else
585 forward = false;
586 }
587 }
588 rcu_read_unlock();
589 }
590
591 if (reply) {
592 lifetime = PREQ_IE_LIFETIME(preq_elem);
593 ttl = ifmsh->mshcfg.element_ttl;
594 if (ttl != 0) {
595 mhwmp_dbg(sdata, "replying to the PREQ\n");
596 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
597 cpu_to_le32(orig_sn), 0, target_addr,
598 cpu_to_le32(target_sn), mgmt->sa, 0, ttl,
599 cpu_to_le32(lifetime), cpu_to_le32(metric),
600 0, sdata);
601 } else {
602 ifmsh->mshstats.dropped_frames_ttl++;
603 }
604 }
605
606 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
607 u32 preq_id;
608 u8 hopcount;
609
610 ttl = PREQ_IE_TTL(preq_elem);
611 lifetime = PREQ_IE_LIFETIME(preq_elem);
612 if (ttl <= 1) {
613 ifmsh->mshstats.dropped_frames_ttl++;
614 return;
615 }
616 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
617 --ttl;
618 preq_id = PREQ_IE_PREQ_ID(preq_elem);
619 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
620 da = (mpath && mpath->is_root) ?
621 mpath->rann_snd_addr : broadcast_addr;
622
623 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
624 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
625 target_sn = PREQ_IE_TARGET_SN(preq_elem);
626 metric = orig_metric;
627 }
628
629 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
630 cpu_to_le32(orig_sn), target_flags, target_addr,
631 cpu_to_le32(target_sn), da,
632 hopcount, ttl, cpu_to_le32(lifetime),
633 cpu_to_le32(metric), cpu_to_le32(preq_id),
634 sdata);
635 if (!is_multicast_ether_addr(da))
636 ifmsh->mshstats.fwded_unicast++;
637 else
638 ifmsh->mshstats.fwded_mcast++;
639 ifmsh->mshstats.fwded_frames++;
640 }
641 }
642
643
644 static inline struct sta_info *
645 next_hop_deref_protected(struct mesh_path *mpath)
646 {
647 return rcu_dereference_protected(mpath->next_hop,
648 lockdep_is_held(&mpath->state_lock));
649 }
650
651
652 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
653 struct ieee80211_mgmt *mgmt,
654 const u8 *prep_elem, u32 metric)
655 {
656 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
657 struct mesh_path *mpath;
658 const u8 *target_addr, *orig_addr;
659 u8 ttl, hopcount, flags;
660 u8 next_hop[ETH_ALEN];
661 u32 target_sn, orig_sn, lifetime;
662
663 mhwmp_dbg(sdata, "received PREP from %pM\n",
664 PREP_IE_ORIG_ADDR(prep_elem));
665
666 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
667 if (ether_addr_equal(orig_addr, sdata->vif.addr))
668 /* destination, no forwarding required */
669 return;
670
671 if (!ifmsh->mshcfg.dot11MeshForwarding)
672 return;
673
674 ttl = PREP_IE_TTL(prep_elem);
675 if (ttl <= 1) {
676 sdata->u.mesh.mshstats.dropped_frames_ttl++;
677 return;
678 }
679
680 rcu_read_lock();
681 mpath = mesh_path_lookup(sdata, orig_addr);
682 if (mpath)
683 spin_lock_bh(&mpath->state_lock);
684 else
685 goto fail;
686 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
687 spin_unlock_bh(&mpath->state_lock);
688 goto fail;
689 }
690 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
691 spin_unlock_bh(&mpath->state_lock);
692 --ttl;
693 flags = PREP_IE_FLAGS(prep_elem);
694 lifetime = PREP_IE_LIFETIME(prep_elem);
695 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
696 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
697 target_sn = PREP_IE_TARGET_SN(prep_elem);
698 orig_sn = PREP_IE_ORIG_SN(prep_elem);
699
700 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
701 cpu_to_le32(orig_sn), 0, target_addr,
702 cpu_to_le32(target_sn), next_hop, hopcount,
703 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
704 0, sdata);
705 rcu_read_unlock();
706
707 sdata->u.mesh.mshstats.fwded_unicast++;
708 sdata->u.mesh.mshstats.fwded_frames++;
709 return;
710
711 fail:
712 rcu_read_unlock();
713 sdata->u.mesh.mshstats.dropped_frames_no_route++;
714 }
715
716 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
717 struct ieee80211_mgmt *mgmt,
718 const u8 *perr_elem)
719 {
720 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
721 struct mesh_path *mpath;
722 u8 ttl;
723 const u8 *ta, *target_addr;
724 u32 target_sn;
725 u16 target_rcode;
726
727 ta = mgmt->sa;
728 ttl = PERR_IE_TTL(perr_elem);
729 if (ttl <= 1) {
730 ifmsh->mshstats.dropped_frames_ttl++;
731 return;
732 }
733 ttl--;
734 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
735 target_sn = PERR_IE_TARGET_SN(perr_elem);
736 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
737
738 rcu_read_lock();
739 mpath = mesh_path_lookup(sdata, target_addr);
740 if (mpath) {
741 struct sta_info *sta;
742
743 spin_lock_bh(&mpath->state_lock);
744 sta = next_hop_deref_protected(mpath);
745 if (mpath->flags & MESH_PATH_ACTIVE &&
746 ether_addr_equal(ta, sta->sta.addr) &&
747 (!(mpath->flags & MESH_PATH_SN_VALID) ||
748 SN_GT(target_sn, mpath->sn))) {
749 mpath->flags &= ~MESH_PATH_ACTIVE;
750 mpath->sn = target_sn;
751 spin_unlock_bh(&mpath->state_lock);
752 if (!ifmsh->mshcfg.dot11MeshForwarding)
753 goto endperr;
754 mesh_path_error_tx(sdata, ttl, target_addr,
755 cpu_to_le32(target_sn),
756 cpu_to_le16(target_rcode),
757 broadcast_addr);
758 } else
759 spin_unlock_bh(&mpath->state_lock);
760 }
761 endperr:
762 rcu_read_unlock();
763 }
764
765 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
766 struct ieee80211_mgmt *mgmt,
767 const struct ieee80211_rann_ie *rann)
768 {
769 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
770 struct ieee80211_local *local = sdata->local;
771 struct sta_info *sta;
772 struct mesh_path *mpath;
773 u8 ttl, flags, hopcount;
774 const u8 *orig_addr;
775 u32 orig_sn, metric, metric_txsta, interval;
776 bool root_is_gate;
777
778 ttl = rann->rann_ttl;
779 flags = rann->rann_flags;
780 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
781 orig_addr = rann->rann_addr;
782 orig_sn = le32_to_cpu(rann->rann_seq);
783 interval = le32_to_cpu(rann->rann_interval);
784 hopcount = rann->rann_hopcount;
785 hopcount++;
786 metric = le32_to_cpu(rann->rann_metric);
787
788 /* Ignore our own RANNs */
789 if (ether_addr_equal(orig_addr, sdata->vif.addr))
790 return;
791
792 mhwmp_dbg(sdata,
793 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
794 orig_addr, mgmt->sa, root_is_gate);
795
796 rcu_read_lock();
797 sta = sta_info_get(sdata, mgmt->sa);
798 if (!sta) {
799 rcu_read_unlock();
800 return;
801 }
802
803 metric_txsta = airtime_link_metric_get(local, sta);
804
805 mpath = mesh_path_lookup(sdata, orig_addr);
806 if (!mpath) {
807 mesh_path_add(sdata, orig_addr);
808 mpath = mesh_path_lookup(sdata, orig_addr);
809 if (!mpath) {
810 rcu_read_unlock();
811 sdata->u.mesh.mshstats.dropped_frames_no_route++;
812 return;
813 }
814 }
815
816 if (!(SN_LT(mpath->sn, orig_sn)) &&
817 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
818 rcu_read_unlock();
819 return;
820 }
821
822 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
823 (time_after(jiffies, mpath->last_preq_to_root +
824 root_path_confirmation_jiffies(sdata)) ||
825 time_before(jiffies, mpath->last_preq_to_root))) &&
826 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
827 mhwmp_dbg(sdata,
828 "time to refresh root mpath %pM\n",
829 orig_addr);
830 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
831 mpath->last_preq_to_root = jiffies;
832 }
833
834 mpath->sn = orig_sn;
835 mpath->rann_metric = metric + metric_txsta;
836 mpath->is_root = true;
837 /* Recording RANNs sender address to send individually
838 * addressed PREQs destined for root mesh STA */
839 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
840
841 if (root_is_gate)
842 mesh_path_add_gate(mpath);
843
844 if (ttl <= 1) {
845 ifmsh->mshstats.dropped_frames_ttl++;
846 rcu_read_unlock();
847 return;
848 }
849 ttl--;
850
851 if (ifmsh->mshcfg.dot11MeshForwarding) {
852 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
853 cpu_to_le32(orig_sn),
854 0, NULL, 0, broadcast_addr,
855 hopcount, ttl, cpu_to_le32(interval),
856 cpu_to_le32(metric + metric_txsta),
857 0, sdata);
858 }
859
860 rcu_read_unlock();
861 }
862
863
864 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
865 struct ieee80211_mgmt *mgmt, size_t len)
866 {
867 struct ieee802_11_elems elems;
868 size_t baselen;
869 u32 last_hop_metric;
870 struct sta_info *sta;
871
872 /* need action_code */
873 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
874 return;
875
876 rcu_read_lock();
877 sta = sta_info_get(sdata, mgmt->sa);
878 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) {
879 rcu_read_unlock();
880 return;
881 }
882 rcu_read_unlock();
883
884 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
885 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
886 len - baselen, &elems);
887
888 if (elems.preq) {
889 if (elems.preq_len != 37)
890 /* Right now we support just 1 destination and no AE */
891 return;
892 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
893 MPATH_PREQ);
894 if (last_hop_metric)
895 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
896 last_hop_metric);
897 }
898 if (elems.prep) {
899 if (elems.prep_len != 31)
900 /* Right now we support no AE */
901 return;
902 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
903 MPATH_PREP);
904 if (last_hop_metric)
905 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
906 last_hop_metric);
907 }
908 if (elems.perr) {
909 if (elems.perr_len != 15)
910 /* Right now we support only one destination per PERR */
911 return;
912 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
913 }
914 if (elems.rann)
915 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
916 }
917
918 /**
919 * mesh_queue_preq - queue a PREQ to a given destination
920 *
921 * @mpath: mesh path to discover
922 * @flags: special attributes of the PREQ to be sent
923 *
924 * Locking: the function must be called from within a rcu read lock block.
925 *
926 */
927 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
928 {
929 struct ieee80211_sub_if_data *sdata = mpath->sdata;
930 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
931 struct mesh_preq_queue *preq_node;
932
933 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
934 if (!preq_node) {
935 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
936 return;
937 }
938
939 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
940 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
941 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
942 kfree(preq_node);
943 if (printk_ratelimit())
944 mhwmp_dbg(sdata, "PREQ node queue full\n");
945 return;
946 }
947
948 spin_lock(&mpath->state_lock);
949 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
950 spin_unlock(&mpath->state_lock);
951 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
952 kfree(preq_node);
953 return;
954 }
955
956 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
957 preq_node->flags = flags;
958
959 mpath->flags |= MESH_PATH_REQ_QUEUED;
960 spin_unlock(&mpath->state_lock);
961
962 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
963 ++ifmsh->preq_queue_len;
964 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
965
966 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
967 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
968
969 else if (time_before(jiffies, ifmsh->last_preq)) {
970 /* avoid long wait if did not send preqs for a long time
971 * and jiffies wrapped around
972 */
973 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
974 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
975 } else
976 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
977 min_preq_int_jiff(sdata));
978 }
979
980 /**
981 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
982 *
983 * @sdata: local mesh subif
984 */
985 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
986 {
987 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
988 struct mesh_preq_queue *preq_node;
989 struct mesh_path *mpath;
990 u8 ttl, target_flags;
991 const u8 *da;
992 u32 lifetime;
993
994 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
995 if (!ifmsh->preq_queue_len ||
996 time_before(jiffies, ifmsh->last_preq +
997 min_preq_int_jiff(sdata))) {
998 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
999 return;
1000 }
1001
1002 preq_node = list_first_entry(&ifmsh->preq_queue.list,
1003 struct mesh_preq_queue, list);
1004 list_del(&preq_node->list);
1005 --ifmsh->preq_queue_len;
1006 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
1007
1008 rcu_read_lock();
1009 mpath = mesh_path_lookup(sdata, preq_node->dst);
1010 if (!mpath)
1011 goto enddiscovery;
1012
1013 spin_lock_bh(&mpath->state_lock);
1014 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1015 if (preq_node->flags & PREQ_Q_F_START) {
1016 if (mpath->flags & MESH_PATH_RESOLVING) {
1017 spin_unlock_bh(&mpath->state_lock);
1018 goto enddiscovery;
1019 } else {
1020 mpath->flags &= ~MESH_PATH_RESOLVED;
1021 mpath->flags |= MESH_PATH_RESOLVING;
1022 mpath->discovery_retries = 0;
1023 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1024 }
1025 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1026 mpath->flags & MESH_PATH_RESOLVED) {
1027 mpath->flags &= ~MESH_PATH_RESOLVING;
1028 spin_unlock_bh(&mpath->state_lock);
1029 goto enddiscovery;
1030 }
1031
1032 ifmsh->last_preq = jiffies;
1033
1034 if (time_after(jiffies, ifmsh->last_sn_update +
1035 net_traversal_jiffies(sdata)) ||
1036 time_before(jiffies, ifmsh->last_sn_update)) {
1037 ++ifmsh->sn;
1038 sdata->u.mesh.last_sn_update = jiffies;
1039 }
1040 lifetime = default_lifetime(sdata);
1041 ttl = sdata->u.mesh.mshcfg.element_ttl;
1042 if (ttl == 0) {
1043 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1044 spin_unlock_bh(&mpath->state_lock);
1045 goto enddiscovery;
1046 }
1047
1048 if (preq_node->flags & PREQ_Q_F_REFRESH)
1049 target_flags = MP_F_DO;
1050 else
1051 target_flags = MP_F_RF;
1052
1053 spin_unlock_bh(&mpath->state_lock);
1054 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1055 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr,
1056 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
1057 cpu_to_le32(mpath->sn), da, 0,
1058 ttl, cpu_to_le32(lifetime), 0,
1059 cpu_to_le32(ifmsh->preq_id++), sdata);
1060 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1061
1062 enddiscovery:
1063 rcu_read_unlock();
1064 kfree(preq_node);
1065 }
1066
1067 /**
1068 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1069 *
1070 * @skb: 802.11 frame to be sent
1071 * @sdata: network subif the frame will be sent through
1072 *
1073 * Lookup next hop for given skb and start path discovery if no
1074 * forwarding information is found.
1075 *
1076 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1077 * skb is freeed here if no mpath could be allocated.
1078 */
1079 int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata,
1080 struct sk_buff *skb)
1081 {
1082 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1083 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1084 struct mesh_path *mpath;
1085 struct sk_buff *skb_to_free = NULL;
1086 u8 *target_addr = hdr->addr3;
1087 int err = 0;
1088
1089 /* Nulls are only sent to peers for PS and should be pre-addressed */
1090 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1091 return 0;
1092
1093 rcu_read_lock();
1094 err = mesh_nexthop_lookup(sdata, skb);
1095 if (!err)
1096 goto endlookup;
1097
1098 /* no nexthop found, start resolving */
1099 mpath = mesh_path_lookup(sdata, target_addr);
1100 if (!mpath) {
1101 mesh_path_add(sdata, target_addr);
1102 mpath = mesh_path_lookup(sdata, target_addr);
1103 if (!mpath) {
1104 mesh_path_discard_frame(sdata, skb);
1105 err = -ENOSPC;
1106 goto endlookup;
1107 }
1108 }
1109
1110 if (!(mpath->flags & MESH_PATH_RESOLVING))
1111 mesh_queue_preq(mpath, PREQ_Q_F_START);
1112
1113 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1114 skb_to_free = skb_dequeue(&mpath->frame_queue);
1115
1116 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1117 ieee80211_set_qos_hdr(sdata, skb);
1118 skb_queue_tail(&mpath->frame_queue, skb);
1119 err = -ENOENT;
1120 if (skb_to_free)
1121 mesh_path_discard_frame(sdata, skb_to_free);
1122
1123 endlookup:
1124 rcu_read_unlock();
1125 return err;
1126 }
1127
1128 /**
1129 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1130 * this function is considered "using" the associated mpath, so preempt a path
1131 * refresh if this mpath expires soon.
1132 *
1133 * @skb: 802.11 frame to be sent
1134 * @sdata: network subif the frame will be sent through
1135 *
1136 * Returns: 0 if the next hop was found. Nonzero otherwise.
1137 */
1138 int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata,
1139 struct sk_buff *skb)
1140 {
1141 struct mesh_path *mpath;
1142 struct sta_info *next_hop;
1143 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1144 u8 *target_addr = hdr->addr3;
1145 int err = -ENOENT;
1146
1147 rcu_read_lock();
1148 mpath = mesh_path_lookup(sdata, target_addr);
1149
1150 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1151 goto endlookup;
1152
1153 if (time_after(jiffies,
1154 mpath->exp_time -
1155 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1156 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
1157 !(mpath->flags & MESH_PATH_RESOLVING) &&
1158 !(mpath->flags & MESH_PATH_FIXED))
1159 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1160
1161 next_hop = rcu_dereference(mpath->next_hop);
1162 if (next_hop) {
1163 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1164 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1165 ieee80211_mps_set_frame_flags(sdata, next_hop, hdr);
1166 err = 0;
1167 }
1168
1169 endlookup:
1170 rcu_read_unlock();
1171 return err;
1172 }
1173
1174 void mesh_path_timer(unsigned long data)
1175 {
1176 struct mesh_path *mpath = (void *) data;
1177 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1178 int ret;
1179
1180 if (sdata->local->quiescing)
1181 return;
1182
1183 spin_lock_bh(&mpath->state_lock);
1184 if (mpath->flags & MESH_PATH_RESOLVED ||
1185 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1186 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1187 spin_unlock_bh(&mpath->state_lock);
1188 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1189 ++mpath->discovery_retries;
1190 mpath->discovery_timeout *= 2;
1191 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1192 spin_unlock_bh(&mpath->state_lock);
1193 mesh_queue_preq(mpath, 0);
1194 } else {
1195 mpath->flags = 0;
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 cpu_to_le32(++ifmsh->sn),
1220 0, NULL, 0, broadcast_addr,
1221 0, ifmsh->mshcfg.element_ttl,
1222 cpu_to_le32(interval), 0, 0, sdata);
1223 break;
1224 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1225 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1226 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1227 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1228 target_flags |= IEEE80211_PREQ_TO_FLAG |
1229 IEEE80211_PREQ_USN_FLAG;
1230 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1231 cpu_to_le32(++ifmsh->sn), target_flags,
1232 (u8 *) broadcast_addr, 0, broadcast_addr,
1233 0, ifmsh->mshcfg.element_ttl,
1234 cpu_to_le32(interval),
1235 0, cpu_to_le32(ifmsh->preq_id++), sdata);
1236 break;
1237 default:
1238 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
1239 return;
1240 }
1241 }
Linux 2.6 libata-dev (mirror)