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tuntap: switch to use rtnl_dereference()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / mesh_hwmp.c
blob47aeee2d8db160f6fa9eb62c32131bbd686acc29
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 ieee80211_set_qos_hdr(sdata, skb);
219 }
220
221 /**
222 * mesh_send_path error - Sends a PERR mesh management frame
223 *
224 * @target: broken destination
225 * @target_sn: SN of the broken destination
226 * @target_rcode: reason code for this PERR
227 * @ra: node this frame is addressed to
228 *
229 * Note: This function may be called with driver locks taken that the driver
230 * also acquires in the TX path. To avoid a deadlock we don't transmit the
231 * frame directly but add it to the pending queue instead.
232 */
233 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
234 __le16 target_rcode, const u8 *ra,
235 struct ieee80211_sub_if_data *sdata)
236 {
237 struct ieee80211_local *local = sdata->local;
238 struct sk_buff *skb;
239 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
240 struct ieee80211_mgmt *mgmt;
241 u8 *pos, ie_len;
242 int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) +
243 sizeof(mgmt->u.action.u.mesh_action);
244
245 if (time_before(jiffies, ifmsh->next_perr))
246 return -EAGAIN;
247
248 skb = dev_alloc_skb(local->tx_headroom +
249 hdr_len +
250 2 + 15 /* PERR IE */);
251 if (!skb)
252 return -1;
253 skb_reserve(skb, local->tx_headroom);
254 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
255 memset(mgmt, 0, hdr_len);
256 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
257 IEEE80211_STYPE_ACTION);
258
259 memcpy(mgmt->da, ra, ETH_ALEN);
260 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
261 /* BSSID == SA */
262 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
263 mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
264 mgmt->u.action.u.mesh_action.action_code =
265 WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
266 ie_len = 15;
267 pos = skb_put(skb, 2 + ie_len);
268 *pos++ = WLAN_EID_PERR;
269 *pos++ = ie_len;
270 /* ttl */
271 *pos++ = ttl;
272 /* number of destinations */
273 *pos++ = 1;
274 /*
275 * flags bit, bit 1 is unset if we know the sequence number and
276 * bit 2 is set if we have a reason code
277 */
278 *pos = 0;
279 if (!target_sn)
280 *pos |= MP_F_USN;
281 if (target_rcode)
282 *pos |= MP_F_RCODE;
283 pos++;
284 memcpy(pos, target, ETH_ALEN);
285 pos += ETH_ALEN;
286 memcpy(pos, &target_sn, 4);
287 pos += 4;
288 memcpy(pos, &target_rcode, 2);
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->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed);
312 if (sta->fail_avg > 95)
313 mesh_plink_broken(sta);
314 }
315
316 static u32 airtime_link_metric_get(struct ieee80211_local *local,
317 struct sta_info *sta)
318 {
319 struct rate_info rinfo;
320 /* This should be adjusted for each device */
321 int device_constant = 1 << ARITH_SHIFT;
322 int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
323 int s_unit = 1 << ARITH_SHIFT;
324 int rate, err;
325 u32 tx_time, estimated_retx;
326 u64 result;
327
328 if (sta->fail_avg >= 100)
329 return MAX_METRIC;
330
331 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
332 rate = cfg80211_calculate_bitrate(&rinfo);
333 if (WARN_ON(!rate))
334 return MAX_METRIC;
335
336 err = (sta->fail_avg << ARITH_SHIFT) / 100;
337
338 /* bitrate is in units of 100 Kbps, while we need rate in units of
339 * 1Mbps. This will be corrected on tx_time computation.
340 */
341 tx_time = (device_constant + 10 * test_frame_len / rate);
342 estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
343 result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
344 return (u32)result;
345 }
346
347 /**
348 * hwmp_route_info_get - Update routing info to originator and transmitter
349 *
350 * @sdata: local mesh subif
351 * @mgmt: mesh management frame
352 * @hwmp_ie: hwmp information element (PREP or PREQ)
353 *
354 * This function updates the path routing information to the originator and the
355 * transmitter of a HWMP PREQ or PREP frame.
356 *
357 * Returns: metric to frame originator or 0 if the frame should not be further
358 * processed
359 *
360 * Notes: this function is the only place (besides user-provided info) where
361 * path routing information is updated.
362 */
363 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
364 struct ieee80211_mgmt *mgmt,
365 u8 *hwmp_ie, enum mpath_frame_type action)
366 {
367 struct ieee80211_local *local = sdata->local;
368 struct mesh_path *mpath;
369 struct sta_info *sta;
370 bool fresh_info;
371 u8 *orig_addr, *ta;
372 u32 orig_sn, orig_metric;
373 unsigned long orig_lifetime, exp_time;
374 u32 last_hop_metric, new_metric;
375 bool process = true;
376
377 rcu_read_lock();
378 sta = sta_info_get(sdata, mgmt->sa);
379 if (!sta) {
380 rcu_read_unlock();
381 return 0;
382 }
383
384 last_hop_metric = airtime_link_metric_get(local, sta);
385 /* Update and check originator routing info */
386 fresh_info = true;
387
388 switch (action) {
389 case MPATH_PREQ:
390 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
391 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
392 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
393 orig_metric = PREQ_IE_METRIC(hwmp_ie);
394 break;
395 case MPATH_PREP:
396 /* Originator here refers to the MP that was the target in the
397 * Path Request. We divert from the nomenclature in the draft
398 * so that we can easily use a single function to gather path
399 * information from both PREQ and PREP frames.
400 */
401 orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie);
402 orig_sn = PREP_IE_TARGET_SN(hwmp_ie);
403 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
404 orig_metric = PREP_IE_METRIC(hwmp_ie);
405 break;
406 default:
407 rcu_read_unlock();
408 return 0;
409 }
410 new_metric = orig_metric + last_hop_metric;
411 if (new_metric < orig_metric)
412 new_metric = MAX_METRIC;
413 exp_time = TU_TO_EXP_TIME(orig_lifetime);
414
415 if (ether_addr_equal(orig_addr, sdata->vif.addr)) {
416 /* This MP is the originator, we are not interested in this
417 * frame, except for updating transmitter's path info.
418 */
419 process = false;
420 fresh_info = false;
421 } else {
422 mpath = mesh_path_lookup(orig_addr, sdata);
423 if (mpath) {
424 spin_lock_bh(&mpath->state_lock);
425 if (mpath->flags & MESH_PATH_FIXED)
426 fresh_info = false;
427 else if ((mpath->flags & MESH_PATH_ACTIVE) &&
428 (mpath->flags & MESH_PATH_SN_VALID)) {
429 if (SN_GT(mpath->sn, orig_sn) ||
430 (mpath->sn == orig_sn &&
431 new_metric >= mpath->metric)) {
432 process = false;
433 fresh_info = false;
434 }
435 }
436 } else {
437 mesh_path_add(orig_addr, sdata);
438 mpath = mesh_path_lookup(orig_addr, sdata);
439 if (!mpath) {
440 rcu_read_unlock();
441 return 0;
442 }
443 spin_lock_bh(&mpath->state_lock);
444 }
445
446 if (fresh_info) {
447 mesh_path_assign_nexthop(mpath, sta);
448 mpath->flags |= MESH_PATH_SN_VALID;
449 mpath->metric = new_metric;
450 mpath->sn = orig_sn;
451 mpath->exp_time = time_after(mpath->exp_time, exp_time)
452 ? mpath->exp_time : exp_time;
453 mesh_path_activate(mpath);
454 spin_unlock_bh(&mpath->state_lock);
455 mesh_path_tx_pending(mpath);
456 /* draft says preq_id should be saved to, but there does
457 * not seem to be any use for it, skipping by now
458 */
459 } else
460 spin_unlock_bh(&mpath->state_lock);
461 }
462
463 /* Update and check transmitter routing info */
464 ta = mgmt->sa;
465 if (ether_addr_equal(orig_addr, ta))
466 fresh_info = false;
467 else {
468 fresh_info = true;
469
470 mpath = mesh_path_lookup(ta, sdata);
471 if (mpath) {
472 spin_lock_bh(&mpath->state_lock);
473 if ((mpath->flags & MESH_PATH_FIXED) ||
474 ((mpath->flags & MESH_PATH_ACTIVE) &&
475 (last_hop_metric > mpath->metric)))
476 fresh_info = false;
477 } else {
478 mesh_path_add(ta, sdata);
479 mpath = mesh_path_lookup(ta, sdata);
480 if (!mpath) {
481 rcu_read_unlock();
482 return 0;
483 }
484 spin_lock_bh(&mpath->state_lock);
485 }
486
487 if (fresh_info) {
488 mesh_path_assign_nexthop(mpath, sta);
489 mpath->metric = last_hop_metric;
490 mpath->exp_time = time_after(mpath->exp_time, exp_time)
491 ? mpath->exp_time : exp_time;
492 mesh_path_activate(mpath);
493 spin_unlock_bh(&mpath->state_lock);
494 mesh_path_tx_pending(mpath);
495 } else
496 spin_unlock_bh(&mpath->state_lock);
497 }
498
499 rcu_read_unlock();
500
501 return process ? new_metric : 0;
502 }
503
504 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
505 struct ieee80211_mgmt *mgmt,
506 u8 *preq_elem, u32 metric)
507 {
508 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
509 struct mesh_path *mpath = NULL;
510 u8 *target_addr, *orig_addr;
511 const u8 *da;
512 u8 target_flags, ttl, flags;
513 u32 orig_sn, target_sn, lifetime, orig_metric;
514 bool reply = false;
515 bool forward = true;
516 bool root_is_gate;
517
518 /* Update target SN, if present */
519 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
520 orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
521 target_sn = PREQ_IE_TARGET_SN(preq_elem);
522 orig_sn = PREQ_IE_ORIG_SN(preq_elem);
523 target_flags = PREQ_IE_TARGET_F(preq_elem);
524 orig_metric = metric;
525 /* Proactive PREQ gate announcements */
526 flags = PREQ_IE_FLAGS(preq_elem);
527 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
528
529 mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr);
530
531 if (ether_addr_equal(target_addr, sdata->vif.addr)) {
532 mhwmp_dbg(sdata, "PREQ is for us\n");
533 forward = false;
534 reply = true;
535 metric = 0;
536 if (time_after(jiffies, ifmsh->last_sn_update +
537 net_traversal_jiffies(sdata)) ||
538 time_before(jiffies, ifmsh->last_sn_update)) {
539 target_sn = ++ifmsh->sn;
540 ifmsh->last_sn_update = jiffies;
541 }
542 } else if (is_broadcast_ether_addr(target_addr) &&
543 (target_flags & IEEE80211_PREQ_TO_FLAG)) {
544 rcu_read_lock();
545 mpath = mesh_path_lookup(orig_addr, sdata);
546 if (mpath) {
547 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
548 reply = true;
549 target_addr = sdata->vif.addr;
550 target_sn = ++ifmsh->sn;
551 metric = 0;
552 ifmsh->last_sn_update = jiffies;
553 }
554 if (root_is_gate)
555 mesh_path_add_gate(mpath);
556 }
557 rcu_read_unlock();
558 } else {
559 rcu_read_lock();
560 mpath = mesh_path_lookup(target_addr, sdata);
561 if (mpath) {
562 if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
563 SN_LT(mpath->sn, target_sn)) {
564 mpath->sn = target_sn;
565 mpath->flags |= MESH_PATH_SN_VALID;
566 } else if ((!(target_flags & MP_F_DO)) &&
567 (mpath->flags & MESH_PATH_ACTIVE)) {
568 reply = true;
569 metric = mpath->metric;
570 target_sn = mpath->sn;
571 if (target_flags & MP_F_RF)
572 target_flags |= MP_F_DO;
573 else
574 forward = false;
575 }
576 }
577 rcu_read_unlock();
578 }
579
580 if (reply) {
581 lifetime = PREQ_IE_LIFETIME(preq_elem);
582 ttl = ifmsh->mshcfg.element_ttl;
583 if (ttl != 0) {
584 mhwmp_dbg(sdata, "replying to the PREQ\n");
585 mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr,
586 cpu_to_le32(orig_sn), 0, target_addr,
587 cpu_to_le32(target_sn), mgmt->sa, 0, ttl,
588 cpu_to_le32(lifetime), cpu_to_le32(metric),
589 0, sdata);
590 } else {
591 ifmsh->mshstats.dropped_frames_ttl++;
592 }
593 }
594
595 if (forward && ifmsh->mshcfg.dot11MeshForwarding) {
596 u32 preq_id;
597 u8 hopcount;
598
599 ttl = PREQ_IE_TTL(preq_elem);
600 lifetime = PREQ_IE_LIFETIME(preq_elem);
601 if (ttl <= 1) {
602 ifmsh->mshstats.dropped_frames_ttl++;
603 return;
604 }
605 mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr);
606 --ttl;
607 preq_id = PREQ_IE_PREQ_ID(preq_elem);
608 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
609 da = (mpath && mpath->is_root) ?
610 mpath->rann_snd_addr : broadcast_addr;
611
612 if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) {
613 target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
614 target_sn = PREQ_IE_TARGET_SN(preq_elem);
615 metric = orig_metric;
616 }
617
618 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
619 cpu_to_le32(orig_sn), target_flags, target_addr,
620 cpu_to_le32(target_sn), da,
621 hopcount, ttl, cpu_to_le32(lifetime),
622 cpu_to_le32(metric), cpu_to_le32(preq_id),
623 sdata);
624 if (!is_multicast_ether_addr(da))
625 ifmsh->mshstats.fwded_unicast++;
626 else
627 ifmsh->mshstats.fwded_mcast++;
628 ifmsh->mshstats.fwded_frames++;
629 }
630 }
631
632
633 static inline struct sta_info *
634 next_hop_deref_protected(struct mesh_path *mpath)
635 {
636 return rcu_dereference_protected(mpath->next_hop,
637 lockdep_is_held(&mpath->state_lock));
638 }
639
640
641 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
642 struct ieee80211_mgmt *mgmt,
643 u8 *prep_elem, u32 metric)
644 {
645 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
646 struct mesh_path *mpath;
647 u8 *target_addr, *orig_addr;
648 u8 ttl, hopcount, flags;
649 u8 next_hop[ETH_ALEN];
650 u32 target_sn, orig_sn, lifetime;
651
652 mhwmp_dbg(sdata, "received PREP from %pM\n",
653 PREP_IE_ORIG_ADDR(prep_elem));
654
655 orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
656 if (ether_addr_equal(orig_addr, sdata->vif.addr))
657 /* destination, no forwarding required */
658 return;
659
660 if (!ifmsh->mshcfg.dot11MeshForwarding)
661 return;
662
663 ttl = PREP_IE_TTL(prep_elem);
664 if (ttl <= 1) {
665 sdata->u.mesh.mshstats.dropped_frames_ttl++;
666 return;
667 }
668
669 rcu_read_lock();
670 mpath = mesh_path_lookup(orig_addr, sdata);
671 if (mpath)
672 spin_lock_bh(&mpath->state_lock);
673 else
674 goto fail;
675 if (!(mpath->flags & MESH_PATH_ACTIVE)) {
676 spin_unlock_bh(&mpath->state_lock);
677 goto fail;
678 }
679 memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
680 spin_unlock_bh(&mpath->state_lock);
681 --ttl;
682 flags = PREP_IE_FLAGS(prep_elem);
683 lifetime = PREP_IE_LIFETIME(prep_elem);
684 hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
685 target_addr = PREP_IE_TARGET_ADDR(prep_elem);
686 target_sn = PREP_IE_TARGET_SN(prep_elem);
687 orig_sn = PREP_IE_ORIG_SN(prep_elem);
688
689 mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
690 cpu_to_le32(orig_sn), 0, target_addr,
691 cpu_to_le32(target_sn), next_hop, hopcount,
692 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
693 0, sdata);
694 rcu_read_unlock();
695
696 sdata->u.mesh.mshstats.fwded_unicast++;
697 sdata->u.mesh.mshstats.fwded_frames++;
698 return;
699
700 fail:
701 rcu_read_unlock();
702 sdata->u.mesh.mshstats.dropped_frames_no_route++;
703 }
704
705 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
706 struct ieee80211_mgmt *mgmt, u8 *perr_elem)
707 {
708 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
709 struct mesh_path *mpath;
710 u8 ttl;
711 u8 *ta, *target_addr;
712 u32 target_sn;
713 u16 target_rcode;
714
715 ta = mgmt->sa;
716 ttl = PERR_IE_TTL(perr_elem);
717 if (ttl <= 1) {
718 ifmsh->mshstats.dropped_frames_ttl++;
719 return;
720 }
721 ttl--;
722 target_addr = PERR_IE_TARGET_ADDR(perr_elem);
723 target_sn = PERR_IE_TARGET_SN(perr_elem);
724 target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
725
726 rcu_read_lock();
727 mpath = mesh_path_lookup(target_addr, sdata);
728 if (mpath) {
729 struct sta_info *sta;
730
731 spin_lock_bh(&mpath->state_lock);
732 sta = next_hop_deref_protected(mpath);
733 if (mpath->flags & MESH_PATH_ACTIVE &&
734 ether_addr_equal(ta, sta->sta.addr) &&
735 (!(mpath->flags & MESH_PATH_SN_VALID) ||
736 SN_GT(target_sn, mpath->sn))) {
737 mpath->flags &= ~MESH_PATH_ACTIVE;
738 mpath->sn = target_sn;
739 spin_unlock_bh(&mpath->state_lock);
740 if (!ifmsh->mshcfg.dot11MeshForwarding)
741 goto endperr;
742 mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn),
743 cpu_to_le16(target_rcode),
744 broadcast_addr, sdata);
745 } else
746 spin_unlock_bh(&mpath->state_lock);
747 }
748 endperr:
749 rcu_read_unlock();
750 }
751
752 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
753 struct ieee80211_mgmt *mgmt,
754 struct ieee80211_rann_ie *rann)
755 {
756 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
757 struct ieee80211_local *local = sdata->local;
758 struct sta_info *sta;
759 struct mesh_path *mpath;
760 u8 ttl, flags, hopcount;
761 u8 *orig_addr;
762 u32 orig_sn, metric, metric_txsta, interval;
763 bool root_is_gate;
764
765 ttl = rann->rann_ttl;
766 flags = rann->rann_flags;
767 root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
768 orig_addr = rann->rann_addr;
769 orig_sn = le32_to_cpu(rann->rann_seq);
770 interval = le32_to_cpu(rann->rann_interval);
771 hopcount = rann->rann_hopcount;
772 hopcount++;
773 metric = le32_to_cpu(rann->rann_metric);
774
775 /* Ignore our own RANNs */
776 if (ether_addr_equal(orig_addr, sdata->vif.addr))
777 return;
778
779 mhwmp_dbg(sdata,
780 "received RANN from %pM via neighbour %pM (is_gate=%d)\n",
781 orig_addr, mgmt->sa, root_is_gate);
782
783 rcu_read_lock();
784 sta = sta_info_get(sdata, mgmt->sa);
785 if (!sta) {
786 rcu_read_unlock();
787 return;
788 }
789
790 metric_txsta = airtime_link_metric_get(local, sta);
791
792 mpath = mesh_path_lookup(orig_addr, sdata);
793 if (!mpath) {
794 mesh_path_add(orig_addr, sdata);
795 mpath = mesh_path_lookup(orig_addr, sdata);
796 if (!mpath) {
797 rcu_read_unlock();
798 sdata->u.mesh.mshstats.dropped_frames_no_route++;
799 return;
800 }
801 }
802
803 if (!(SN_LT(mpath->sn, orig_sn)) &&
804 !(mpath->sn == orig_sn && metric < mpath->rann_metric)) {
805 rcu_read_unlock();
806 return;
807 }
808
809 if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
810 (time_after(jiffies, mpath->last_preq_to_root +
811 root_path_confirmation_jiffies(sdata)) ||
812 time_before(jiffies, mpath->last_preq_to_root))) &&
813 !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) {
814 mhwmp_dbg(sdata,
815 "time to refresh root mpath %pM\n",
816 orig_addr);
817 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
818 mpath->last_preq_to_root = jiffies;
819 }
820
821 mpath->sn = orig_sn;
822 mpath->rann_metric = metric + metric_txsta;
823 mpath->is_root = true;
824 /* Recording RANNs sender address to send individually
825 * addressed PREQs destined for root mesh STA */
826 memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN);
827
828 if (root_is_gate)
829 mesh_path_add_gate(mpath);
830
831 if (ttl <= 1) {
832 ifmsh->mshstats.dropped_frames_ttl++;
833 rcu_read_unlock();
834 return;
835 }
836 ttl--;
837
838 if (ifmsh->mshcfg.dot11MeshForwarding) {
839 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
840 cpu_to_le32(orig_sn),
841 0, NULL, 0, broadcast_addr,
842 hopcount, ttl, cpu_to_le32(interval),
843 cpu_to_le32(metric + metric_txsta),
844 0, sdata);
845 }
846
847 rcu_read_unlock();
848 }
849
850
851 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
852 struct ieee80211_mgmt *mgmt,
853 size_t len)
854 {
855 struct ieee802_11_elems elems;
856 size_t baselen;
857 u32 last_hop_metric;
858 struct sta_info *sta;
859
860 /* need action_code */
861 if (len < IEEE80211_MIN_ACTION_SIZE + 1)
862 return;
863
864 rcu_read_lock();
865 sta = sta_info_get(sdata, mgmt->sa);
866 if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) {
867 rcu_read_unlock();
868 return;
869 }
870 rcu_read_unlock();
871
872 baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
873 ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
874 len - baselen, &elems);
875
876 if (elems.preq) {
877 if (elems.preq_len != 37)
878 /* Right now we support just 1 destination and no AE */
879 return;
880 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
881 MPATH_PREQ);
882 if (last_hop_metric)
883 hwmp_preq_frame_process(sdata, mgmt, elems.preq,
884 last_hop_metric);
885 }
886 if (elems.prep) {
887 if (elems.prep_len != 31)
888 /* Right now we support no AE */
889 return;
890 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
891 MPATH_PREP);
892 if (last_hop_metric)
893 hwmp_prep_frame_process(sdata, mgmt, elems.prep,
894 last_hop_metric);
895 }
896 if (elems.perr) {
897 if (elems.perr_len != 15)
898 /* Right now we support only one destination per PERR */
899 return;
900 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
901 }
902 if (elems.rann)
903 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
904 }
905
906 /**
907 * mesh_queue_preq - queue a PREQ to a given destination
908 *
909 * @mpath: mesh path to discover
910 * @flags: special attributes of the PREQ to be sent
911 *
912 * Locking: the function must be called from within a rcu read lock block.
913 *
914 */
915 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
916 {
917 struct ieee80211_sub_if_data *sdata = mpath->sdata;
918 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
919 struct mesh_preq_queue *preq_node;
920
921 preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
922 if (!preq_node) {
923 mhwmp_dbg(sdata, "could not allocate PREQ node\n");
924 return;
925 }
926
927 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
928 if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
929 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
930 kfree(preq_node);
931 if (printk_ratelimit())
932 mhwmp_dbg(sdata, "PREQ node queue full\n");
933 return;
934 }
935
936 spin_lock(&mpath->state_lock);
937 if (mpath->flags & MESH_PATH_REQ_QUEUED) {
938 spin_unlock(&mpath->state_lock);
939 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
940 kfree(preq_node);
941 return;
942 }
943
944 memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
945 preq_node->flags = flags;
946
947 mpath->flags |= MESH_PATH_REQ_QUEUED;
948 spin_unlock(&mpath->state_lock);
949
950 list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
951 ++ifmsh->preq_queue_len;
952 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
953
954 if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
955 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
956
957 else if (time_before(jiffies, ifmsh->last_preq)) {
958 /* avoid long wait if did not send preqs for a long time
959 * and jiffies wrapped around
960 */
961 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
962 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
963 } else
964 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
965 min_preq_int_jiff(sdata));
966 }
967
968 /**
969 * mesh_path_start_discovery - launch a path discovery from the PREQ queue
970 *
971 * @sdata: local mesh subif
972 */
973 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
974 {
975 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
976 struct mesh_preq_queue *preq_node;
977 struct mesh_path *mpath;
978 u8 ttl, target_flags;
979 const u8 *da;
980 u32 lifetime;
981
982 spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
983 if (!ifmsh->preq_queue_len ||
984 time_before(jiffies, ifmsh->last_preq +
985 min_preq_int_jiff(sdata))) {
986 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
987 return;
988 }
989
990 preq_node = list_first_entry(&ifmsh->preq_queue.list,
991 struct mesh_preq_queue, list);
992 list_del(&preq_node->list);
993 --ifmsh->preq_queue_len;
994 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
995
996 rcu_read_lock();
997 mpath = mesh_path_lookup(preq_node->dst, sdata);
998 if (!mpath)
999 goto enddiscovery;
1000
1001 spin_lock_bh(&mpath->state_lock);
1002 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1003 if (preq_node->flags & PREQ_Q_F_START) {
1004 if (mpath->flags & MESH_PATH_RESOLVING) {
1005 spin_unlock_bh(&mpath->state_lock);
1006 goto enddiscovery;
1007 } else {
1008 mpath->flags &= ~MESH_PATH_RESOLVED;
1009 mpath->flags |= MESH_PATH_RESOLVING;
1010 mpath->discovery_retries = 0;
1011 mpath->discovery_timeout = disc_timeout_jiff(sdata);
1012 }
1013 } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
1014 mpath->flags & MESH_PATH_RESOLVED) {
1015 mpath->flags &= ~MESH_PATH_RESOLVING;
1016 spin_unlock_bh(&mpath->state_lock);
1017 goto enddiscovery;
1018 }
1019
1020 ifmsh->last_preq = jiffies;
1021
1022 if (time_after(jiffies, ifmsh->last_sn_update +
1023 net_traversal_jiffies(sdata)) ||
1024 time_before(jiffies, ifmsh->last_sn_update)) {
1025 ++ifmsh->sn;
1026 sdata->u.mesh.last_sn_update = jiffies;
1027 }
1028 lifetime = default_lifetime(sdata);
1029 ttl = sdata->u.mesh.mshcfg.element_ttl;
1030 if (ttl == 0) {
1031 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1032 spin_unlock_bh(&mpath->state_lock);
1033 goto enddiscovery;
1034 }
1035
1036 if (preq_node->flags & PREQ_Q_F_REFRESH)
1037 target_flags = MP_F_DO;
1038 else
1039 target_flags = MP_F_RF;
1040
1041 spin_unlock_bh(&mpath->state_lock);
1042 da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr;
1043 mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr,
1044 cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
1045 cpu_to_le32(mpath->sn), da, 0,
1046 ttl, cpu_to_le32(lifetime), 0,
1047 cpu_to_le32(ifmsh->preq_id++), sdata);
1048 mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
1049
1050 enddiscovery:
1051 rcu_read_unlock();
1052 kfree(preq_node);
1053 }
1054
1055 /**
1056 * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery
1057 *
1058 * @skb: 802.11 frame to be sent
1059 * @sdata: network subif the frame will be sent through
1060 *
1061 * Lookup next hop for given skb and start path discovery if no
1062 * forwarding information is found.
1063 *
1064 * Returns: 0 if the next hop was found and -ENOENT if the frame was queued.
1065 * skb is freeed here if no mpath could be allocated.
1066 */
1067 int mesh_nexthop_resolve(struct sk_buff *skb,
1068 struct ieee80211_sub_if_data *sdata)
1069 {
1070 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1072 struct mesh_path *mpath;
1073 struct sk_buff *skb_to_free = NULL;
1074 u8 *target_addr = hdr->addr3;
1075 int err = 0;
1076
1077 rcu_read_lock();
1078 err = mesh_nexthop_lookup(skb, sdata);
1079 if (!err)
1080 goto endlookup;
1081
1082 /* no nexthop found, start resolving */
1083 mpath = mesh_path_lookup(target_addr, sdata);
1084 if (!mpath) {
1085 mesh_path_add(target_addr, sdata);
1086 mpath = mesh_path_lookup(target_addr, sdata);
1087 if (!mpath) {
1088 mesh_path_discard_frame(skb, sdata);
1089 err = -ENOSPC;
1090 goto endlookup;
1091 }
1092 }
1093
1094 if (!(mpath->flags & MESH_PATH_RESOLVING))
1095 mesh_queue_preq(mpath, PREQ_Q_F_START);
1096
1097 if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN)
1098 skb_to_free = skb_dequeue(&mpath->frame_queue);
1099
1100 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1101 ieee80211_set_qos_hdr(sdata, skb);
1102 skb_queue_tail(&mpath->frame_queue, skb);
1103 err = -ENOENT;
1104 if (skb_to_free)
1105 mesh_path_discard_frame(skb_to_free, sdata);
1106
1107 endlookup:
1108 rcu_read_unlock();
1109 return err;
1110 }
1111 /**
1112 * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling
1113 * this function is considered "using" the associated mpath, so preempt a path
1114 * refresh if this mpath expires soon.
1115 *
1116 * @skb: 802.11 frame to be sent
1117 * @sdata: network subif the frame will be sent through
1118 *
1119 * Returns: 0 if the next hop was found. Nonzero otherwise.
1120 */
1121 int mesh_nexthop_lookup(struct sk_buff *skb,
1122 struct ieee80211_sub_if_data *sdata)
1123 {
1124 struct mesh_path *mpath;
1125 struct sta_info *next_hop;
1126 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1127 u8 *target_addr = hdr->addr3;
1128 int err = -ENOENT;
1129
1130 rcu_read_lock();
1131 mpath = mesh_path_lookup(target_addr, sdata);
1132
1133 if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE))
1134 goto endlookup;
1135
1136 if (time_after(jiffies,
1137 mpath->exp_time -
1138 msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1139 ether_addr_equal(sdata->vif.addr, hdr->addr4) &&
1140 !(mpath->flags & MESH_PATH_RESOLVING) &&
1141 !(mpath->flags & MESH_PATH_FIXED))
1142 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1143
1144 next_hop = rcu_dereference(mpath->next_hop);
1145 if (next_hop) {
1146 memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1147 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
1148 err = 0;
1149 }
1150
1151 endlookup:
1152 rcu_read_unlock();
1153 return err;
1154 }
1155
1156 void mesh_path_timer(unsigned long data)
1157 {
1158 struct mesh_path *mpath = (void *) data;
1159 struct ieee80211_sub_if_data *sdata = mpath->sdata;
1160 int ret;
1161
1162 if (sdata->local->quiescing)
1163 return;
1164
1165 spin_lock_bh(&mpath->state_lock);
1166 if (mpath->flags & MESH_PATH_RESOLVED ||
1167 (!(mpath->flags & MESH_PATH_RESOLVING))) {
1168 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1169 spin_unlock_bh(&mpath->state_lock);
1170 } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1171 ++mpath->discovery_retries;
1172 mpath->discovery_timeout *= 2;
1173 mpath->flags &= ~MESH_PATH_REQ_QUEUED;
1174 spin_unlock_bh(&mpath->state_lock);
1175 mesh_queue_preq(mpath, 0);
1176 } else {
1177 mpath->flags = 0;
1178 mpath->exp_time = jiffies;
1179 spin_unlock_bh(&mpath->state_lock);
1180 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1181 ret = mesh_path_send_to_gates(mpath);
1182 if (ret)
1183 mhwmp_dbg(sdata, "no gate was reachable\n");
1184 } else
1185 mesh_path_flush_pending(mpath);
1186 }
1187 }
1188
1189 void
1190 mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1191 {
1192 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1193 u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1194 u8 flags, target_flags = 0;
1195
1196 flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1197 ? RANN_FLAG_IS_GATE : 0;
1198
1199 switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) {
1200 case IEEE80211_PROACTIVE_RANN:
1201 mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1202 cpu_to_le32(++ifmsh->sn),
1203 0, NULL, 0, broadcast_addr,
1204 0, ifmsh->mshcfg.element_ttl,
1205 cpu_to_le32(interval), 0, 0, sdata);
1206 break;
1207 case IEEE80211_PROACTIVE_PREQ_WITH_PREP:
1208 flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG;
1209 case IEEE80211_PROACTIVE_PREQ_NO_PREP:
1210 interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout;
1211 target_flags |= IEEE80211_PREQ_TO_FLAG |
1212 IEEE80211_PREQ_USN_FLAG;
1213 mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr,
1214 cpu_to_le32(++ifmsh->sn), target_flags,
1215 (u8 *) broadcast_addr, 0, broadcast_addr,
1216 0, ifmsh->mshcfg.element_ttl,
1217 cpu_to_le32(interval),
1218 0, cpu_to_le32(ifmsh->preq_id++), sdata);
1219 break;
1220 default:
1221 mhwmp_dbg(sdata, "Proactive mechanism not supported\n");
1222 return;
1223 }
1224 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree