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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 | } |
1242 |
Branches:
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ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9