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050ac52c LCC |
1 | /* |
2 | * Copyright (c) 2008 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 "mesh.h" | |
11 | ||
27db2e42 RP |
12 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
13 | #define mhwmp_dbg(fmt, args...) printk(KERN_DEBUG "Mesh HWMP: " fmt, ##args) | |
14 | #else | |
15 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
16 | #endif | |
17 | ||
050ac52c LCC |
18 | #define TEST_FRAME_LEN 8192 |
19 | #define MAX_METRIC 0xffffffff | |
20 | #define ARITH_SHIFT 8 | |
21 | ||
22 | /* Number of frames buffered per destination for unresolved destinations */ | |
23 | #define MESH_FRAME_QUEUE_LEN 10 | |
24 | #define MAX_PREQ_QUEUE_LEN 64 | |
25 | ||
26 | /* Destination only */ | |
27 | #define MP_F_DO 0x1 | |
28 | /* Reply and forward */ | |
29 | #define MP_F_RF 0x2 | |
30 | ||
a00de5d0 LCC |
31 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
32 | { | |
33 | if (ae) | |
34 | offset += 6; | |
ae7245cb | 35 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
36 | } |
37 | ||
050ac52c | 38 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
39 | #define AE_F (1<<6) |
40 | #define AE_F_SET(x) (*x & AE_F) | |
41 | #define PREQ_IE_FLAGS(x) (*(x)) | |
42 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
43 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
44 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
45 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
46 | #define PREQ_IE_ORIG_DSN(x) u32_field_get(x, 13, 0); | |
47 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)); | |
48 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)); | |
49 | #define PREQ_IE_DST_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) | |
50 | #define PREQ_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
51 | #define PREQ_IE_DST_DSN(x) u32_field_get(x, 33, AE_F_SET(x)); | |
52 | ||
53 | ||
54 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
55 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
56 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
57 | #define PREP_IE_ORIG_ADDR(x) (x + 3) | |
58 | #define PREP_IE_ORIG_DSN(x) u32_field_get(x, 9, 0); | |
59 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)); | |
60 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)); | |
61 | #define PREP_IE_DST_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) | |
62 | #define PREP_IE_DST_DSN(x) u32_field_get(x, 27, AE_F_SET(x)); | |
63 | ||
64 | #define PERR_IE_DST_ADDR(x) (x + 2) | |
65 | #define PERR_IE_DST_DSN(x) u32_field_get(x, 8, 0); | |
050ac52c | 66 | |
050ac52c LCC |
67 | #define MSEC_TO_TU(x) (x*1000/1024) |
68 | #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0) | |
69 | #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
70 | ||
71 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 72 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 73 | #define default_lifetime(s) \ |
472dbc45 | 74 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 75 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
76 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
77 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 78 | #define disc_timeout_jiff(s) \ |
472dbc45 | 79 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
80 | |
81 | enum mpath_frame_type { | |
82 | MPATH_PREQ = 0, | |
83 | MPATH_PREP, | |
84 | MPATH_PERR | |
85 | }; | |
86 | ||
87 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, | |
88 | u8 *orig_addr, __le32 orig_dsn, u8 dst_flags, u8 *dst, | |
89 | __le32 dst_dsn, u8 *da, u8 hop_count, u8 ttl, __le32 lifetime, | |
f698d856 | 90 | __le32 metric, __le32 preq_id, struct ieee80211_sub_if_data *sdata) |
050ac52c | 91 | { |
f698d856 | 92 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
93 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
94 | struct ieee80211_mgmt *mgmt; | |
95 | u8 *pos; | |
96 | int ie_len; | |
97 | ||
98 | if (!skb) | |
99 | return -1; | |
100 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
101 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
102 | * common action part (1) | |
103 | */ | |
104 | mgmt = (struct ieee80211_mgmt *) | |
105 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
106 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
107 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
108 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
109 | |
110 | memcpy(mgmt->da, da, ETH_ALEN); | |
f698d856 | 111 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
050ac52c LCC |
112 | /* BSSID is left zeroed, wildcard value */ |
113 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; | |
095de013 | 114 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
050ac52c LCC |
115 | |
116 | switch (action) { | |
117 | case MPATH_PREQ: | |
27db2e42 | 118 | mhwmp_dbg("sending PREQ\n"); |
050ac52c LCC |
119 | ie_len = 37; |
120 | pos = skb_put(skb, 2 + ie_len); | |
121 | *pos++ = WLAN_EID_PREQ; | |
122 | break; | |
123 | case MPATH_PREP: | |
27db2e42 | 124 | mhwmp_dbg("sending PREP\n"); |
050ac52c LCC |
125 | ie_len = 31; |
126 | pos = skb_put(skb, 2 + ie_len); | |
127 | *pos++ = WLAN_EID_PREP; | |
128 | break; | |
129 | default: | |
812714d7 | 130 | kfree_skb(skb); |
050ac52c LCC |
131 | return -ENOTSUPP; |
132 | break; | |
133 | } | |
134 | *pos++ = ie_len; | |
135 | *pos++ = flags; | |
136 | *pos++ = hop_count; | |
137 | *pos++ = ttl; | |
138 | if (action == MPATH_PREQ) { | |
139 | memcpy(pos, &preq_id, 4); | |
140 | pos += 4; | |
141 | } | |
142 | memcpy(pos, orig_addr, ETH_ALEN); | |
143 | pos += ETH_ALEN; | |
144 | memcpy(pos, &orig_dsn, 4); | |
145 | pos += 4; | |
146 | memcpy(pos, &lifetime, 4); | |
147 | pos += 4; | |
148 | memcpy(pos, &metric, 4); | |
149 | pos += 4; | |
150 | if (action == MPATH_PREQ) { | |
151 | /* destination count */ | |
152 | *pos++ = 1; | |
153 | *pos++ = dst_flags; | |
154 | } | |
155 | memcpy(pos, dst, ETH_ALEN); | |
156 | pos += ETH_ALEN; | |
157 | memcpy(pos, &dst_dsn, 4); | |
158 | ||
1acc97b6 | 159 | ieee80211_tx_skb(sdata, skb, 1); |
050ac52c LCC |
160 | return 0; |
161 | } | |
162 | ||
163 | /** | |
164 | * mesh_send_path error - Sends a PERR mesh management frame | |
165 | * | |
166 | * @dst: broken destination | |
167 | * @dst_dsn: dsn of the broken destination | |
168 | * @ra: node this frame is addressed to | |
169 | */ | |
170 | int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra, | |
f698d856 | 171 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 172 | { |
f698d856 | 173 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
174 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
175 | struct ieee80211_mgmt *mgmt; | |
176 | u8 *pos; | |
177 | int ie_len; | |
178 | ||
179 | if (!skb) | |
180 | return -1; | |
181 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
182 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
183 | * common action part (1) | |
184 | */ | |
185 | mgmt = (struct ieee80211_mgmt *) | |
186 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
187 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
188 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
189 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
190 | |
191 | memcpy(mgmt->da, ra, ETH_ALEN); | |
f698d856 | 192 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
050ac52c LCC |
193 | /* BSSID is left zeroed, wildcard value */ |
194 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; | |
dbb81c42 | 195 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
050ac52c LCC |
196 | ie_len = 12; |
197 | pos = skb_put(skb, 2 + ie_len); | |
198 | *pos++ = WLAN_EID_PERR; | |
199 | *pos++ = ie_len; | |
200 | /* mode flags, reserved */ | |
201 | *pos++ = 0; | |
202 | /* number of destinations */ | |
203 | *pos++ = 1; | |
204 | memcpy(pos, dst, ETH_ALEN); | |
205 | pos += ETH_ALEN; | |
206 | memcpy(pos, &dst_dsn, 4); | |
207 | ||
1acc97b6 | 208 | ieee80211_tx_skb(sdata, skb, 1); |
050ac52c LCC |
209 | return 0; |
210 | } | |
211 | ||
bfc32e6a JC |
212 | void ieee80211s_update_metric(struct ieee80211_local *local, |
213 | struct sta_info *stainfo, struct sk_buff *skb) | |
214 | { | |
215 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
216 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
217 | int failed; | |
218 | ||
219 | if (!ieee80211_is_data(hdr->frame_control)) | |
220 | return; | |
221 | ||
222 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
223 | ||
224 | /* moving average, scaled to 100 */ | |
225 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
226 | if (stainfo->fail_avg > 95) | |
227 | mesh_plink_broken(stainfo); | |
228 | } | |
229 | ||
050ac52c LCC |
230 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
231 | struct sta_info *sta) | |
232 | { | |
233 | struct ieee80211_supported_band *sband; | |
234 | /* This should be adjusted for each device */ | |
235 | int device_constant = 1 << ARITH_SHIFT; | |
236 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
237 | int s_unit = 1 << ARITH_SHIFT; | |
238 | int rate, err; | |
239 | u32 tx_time, estimated_retx; | |
240 | u64 result; | |
241 | ||
242 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
243 | ||
244 | if (sta->fail_avg >= 100) | |
245 | return MAX_METRIC; | |
e6a9854b JB |
246 | |
247 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
248 | return MAX_METRIC; | |
249 | ||
050ac52c LCC |
250 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
251 | ||
252 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
253 | * 1Mbps. This will be corrected on tx_time computation. | |
254 | */ | |
e6a9854b | 255 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
256 | tx_time = (device_constant + 10 * test_frame_len / rate); |
257 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
258 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
259 | return (u32)result; | |
260 | } | |
261 | ||
262 | /** | |
263 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
264 | * | |
f698d856 | 265 | * @sdata: local mesh subif |
050ac52c LCC |
266 | * @mgmt: mesh management frame |
267 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
268 | * | |
269 | * This function updates the path routing information to the originator and the | |
f99288d1 | 270 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
271 | * |
272 | * Returns: metric to frame originator or 0 if the frame should not be further | |
273 | * processed | |
274 | * | |
275 | * Notes: this function is the only place (besides user-provided info) where | |
276 | * path routing information is updated. | |
277 | */ | |
f698d856 | 278 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 279 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 280 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 281 | { |
f698d856 | 282 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
283 | struct mesh_path *mpath; |
284 | struct sta_info *sta; | |
285 | bool fresh_info; | |
286 | u8 *orig_addr, *ta; | |
287 | u32 orig_dsn, orig_metric; | |
288 | unsigned long orig_lifetime, exp_time; | |
289 | u32 last_hop_metric, new_metric; | |
290 | bool process = true; | |
050ac52c LCC |
291 | |
292 | rcu_read_lock(); | |
293 | sta = sta_info_get(local, mgmt->sa); | |
dc0b0f7d JB |
294 | if (!sta) { |
295 | rcu_read_unlock(); | |
050ac52c | 296 | return 0; |
dc0b0f7d | 297 | } |
050ac52c LCC |
298 | |
299 | last_hop_metric = airtime_link_metric_get(local, sta); | |
300 | /* Update and check originator routing info */ | |
301 | fresh_info = true; | |
302 | ||
303 | switch (action) { | |
304 | case MPATH_PREQ: | |
305 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
306 | orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie); | |
307 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); | |
308 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
309 | break; | |
310 | case MPATH_PREP: | |
311 | /* Originator here refers to the MP that was the destination in | |
312 | * the Path Request. The draft refers to that MP as the | |
313 | * destination address, even though usually it is the origin of | |
314 | * the PREP frame. We divert from the nomenclature in the draft | |
315 | * so that we can easily use a single function to gather path | |
316 | * information from both PREQ and PREP frames. | |
317 | */ | |
318 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
319 | orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie); | |
320 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); | |
321 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
322 | break; | |
323 | default: | |
dc0b0f7d | 324 | rcu_read_unlock(); |
050ac52c LCC |
325 | return 0; |
326 | } | |
327 | new_metric = orig_metric + last_hop_metric; | |
328 | if (new_metric < orig_metric) | |
329 | new_metric = MAX_METRIC; | |
330 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
331 | ||
f698d856 | 332 | if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
333 | /* This MP is the originator, we are not interested in this |
334 | * frame, except for updating transmitter's path info. | |
335 | */ | |
336 | process = false; | |
337 | fresh_info = false; | |
338 | } else { | |
f698d856 | 339 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
340 | if (mpath) { |
341 | spin_lock_bh(&mpath->state_lock); | |
342 | if (mpath->flags & MESH_PATH_FIXED) | |
343 | fresh_info = false; | |
344 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
345 | (mpath->flags & MESH_PATH_DSN_VALID)) { | |
346 | if (DSN_GT(mpath->dsn, orig_dsn) || | |
347 | (mpath->dsn == orig_dsn && | |
348 | action == MPATH_PREQ && | |
349 | new_metric > mpath->metric)) { | |
350 | process = false; | |
351 | fresh_info = false; | |
352 | } | |
353 | } | |
354 | } else { | |
f698d856 JBG |
355 | mesh_path_add(orig_addr, sdata); |
356 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
357 | if (!mpath) { |
358 | rcu_read_unlock(); | |
050ac52c LCC |
359 | return 0; |
360 | } | |
361 | spin_lock_bh(&mpath->state_lock); | |
362 | } | |
363 | ||
364 | if (fresh_info) { | |
365 | mesh_path_assign_nexthop(mpath, sta); | |
366 | mpath->flags |= MESH_PATH_DSN_VALID; | |
367 | mpath->metric = new_metric; | |
368 | mpath->dsn = orig_dsn; | |
369 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
370 | ? mpath->exp_time : exp_time; | |
371 | mesh_path_activate(mpath); | |
372 | spin_unlock_bh(&mpath->state_lock); | |
373 | mesh_path_tx_pending(mpath); | |
374 | /* draft says preq_id should be saved to, but there does | |
375 | * not seem to be any use for it, skipping by now | |
376 | */ | |
377 | } else | |
378 | spin_unlock_bh(&mpath->state_lock); | |
379 | } | |
380 | ||
381 | /* Update and check transmitter routing info */ | |
382 | ta = mgmt->sa; | |
383 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
384 | fresh_info = false; | |
385 | else { | |
386 | fresh_info = true; | |
387 | ||
f698d856 | 388 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
389 | if (mpath) { |
390 | spin_lock_bh(&mpath->state_lock); | |
391 | if ((mpath->flags & MESH_PATH_FIXED) || | |
392 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
393 | (last_hop_metric > mpath->metric))) | |
394 | fresh_info = false; | |
395 | } else { | |
f698d856 JBG |
396 | mesh_path_add(ta, sdata); |
397 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
398 | if (!mpath) { |
399 | rcu_read_unlock(); | |
050ac52c LCC |
400 | return 0; |
401 | } | |
402 | spin_lock_bh(&mpath->state_lock); | |
403 | } | |
404 | ||
405 | if (fresh_info) { | |
406 | mesh_path_assign_nexthop(mpath, sta); | |
407 | mpath->flags &= ~MESH_PATH_DSN_VALID; | |
408 | mpath->metric = last_hop_metric; | |
409 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
410 | ? mpath->exp_time : exp_time; | |
411 | mesh_path_activate(mpath); | |
412 | spin_unlock_bh(&mpath->state_lock); | |
413 | mesh_path_tx_pending(mpath); | |
414 | } else | |
415 | spin_unlock_bh(&mpath->state_lock); | |
416 | } | |
417 | ||
050ac52c LCC |
418 | rcu_read_unlock(); |
419 | ||
420 | return process ? new_metric : 0; | |
421 | } | |
422 | ||
f698d856 | 423 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 424 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
425 | u8 *preq_elem, u32 metric) |
426 | { | |
472dbc45 | 427 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
428 | struct mesh_path *mpath; |
429 | u8 *dst_addr, *orig_addr; | |
430 | u8 dst_flags, ttl; | |
431 | u32 orig_dsn, dst_dsn, lifetime; | |
432 | bool reply = false; | |
433 | bool forward = true; | |
434 | ||
435 | /* Update destination DSN, if present */ | |
436 | dst_addr = PREQ_IE_DST_ADDR(preq_elem); | |
437 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); | |
438 | dst_dsn = PREQ_IE_DST_DSN(preq_elem); | |
439 | orig_dsn = PREQ_IE_ORIG_DSN(preq_elem); | |
440 | dst_flags = PREQ_IE_DST_F(preq_elem); | |
441 | ||
27db2e42 RP |
442 | mhwmp_dbg("received PREQ\n"); |
443 | ||
f698d856 | 444 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
dbb81c42 | 445 | mhwmp_dbg("PREQ is for us\n"); |
050ac52c LCC |
446 | forward = false; |
447 | reply = true; | |
448 | metric = 0; | |
472dbc45 | 449 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 450 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
451 | time_before(jiffies, ifmsh->last_dsn_update)) { |
452 | dst_dsn = ++ifmsh->dsn; | |
453 | ifmsh->last_dsn_update = jiffies; | |
050ac52c LCC |
454 | } |
455 | } else { | |
456 | rcu_read_lock(); | |
f698d856 | 457 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
458 | if (mpath) { |
459 | if ((!(mpath->flags & MESH_PATH_DSN_VALID)) || | |
460 | DSN_LT(mpath->dsn, dst_dsn)) { | |
461 | mpath->dsn = dst_dsn; | |
57ef5ddb | 462 | mpath->flags |= MESH_PATH_DSN_VALID; |
050ac52c LCC |
463 | } else if ((!(dst_flags & MP_F_DO)) && |
464 | (mpath->flags & MESH_PATH_ACTIVE)) { | |
465 | reply = true; | |
466 | metric = mpath->metric; | |
467 | dst_dsn = mpath->dsn; | |
468 | if (dst_flags & MP_F_RF) | |
469 | dst_flags |= MP_F_DO; | |
470 | else | |
471 | forward = false; | |
472 | } | |
473 | } | |
474 | rcu_read_unlock(); | |
475 | } | |
476 | ||
477 | if (reply) { | |
478 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
472dbc45 | 479 | ttl = ifmsh->mshcfg.dot11MeshTTL; |
27db2e42 RP |
480 | if (ttl != 0) { |
481 | mhwmp_dbg("replying to the PREQ\n"); | |
050ac52c | 482 | mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr, |
aa2b5928 LCC |
483 | cpu_to_le32(dst_dsn), 0, orig_addr, |
484 | cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl, | |
485 | cpu_to_le32(lifetime), cpu_to_le32(metric), | |
f698d856 | 486 | 0, sdata); |
27db2e42 | 487 | } else |
472dbc45 | 488 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
489 | } |
490 | ||
491 | if (forward) { | |
492 | u32 preq_id; | |
493 | u8 hopcount, flags; | |
494 | ||
495 | ttl = PREQ_IE_TTL(preq_elem); | |
496 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
497 | if (ttl <= 1) { | |
472dbc45 | 498 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
499 | return; |
500 | } | |
dbb81c42 | 501 | mhwmp_dbg("forwarding the PREQ\n"); |
050ac52c LCC |
502 | --ttl; |
503 | flags = PREQ_IE_FLAGS(preq_elem); | |
504 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
505 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
506 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
aa2b5928 | 507 | cpu_to_le32(orig_dsn), dst_flags, dst_addr, |
f698d856 | 508 | cpu_to_le32(dst_dsn), sdata->dev->broadcast, |
aa2b5928 LCC |
509 | hopcount, ttl, cpu_to_le32(lifetime), |
510 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 511 | sdata); |
c8a61a7d | 512 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 513 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
514 | } |
515 | } | |
516 | ||
517 | ||
f698d856 | 518 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
519 | struct ieee80211_mgmt *mgmt, |
520 | u8 *prep_elem, u32 metric) | |
521 | { | |
050ac52c LCC |
522 | struct mesh_path *mpath; |
523 | u8 *dst_addr, *orig_addr; | |
524 | u8 ttl, hopcount, flags; | |
525 | u8 next_hop[ETH_ALEN]; | |
526 | u32 dst_dsn, orig_dsn, lifetime; | |
527 | ||
dbb81c42 RP |
528 | mhwmp_dbg("received PREP\n"); |
529 | ||
050ac52c LCC |
530 | /* Note that we divert from the draft nomenclature and denominate |
531 | * destination to what the draft refers to as origininator. So in this | |
532 | * function destnation refers to the final destination of the PREP, | |
533 | * which corresponds with the originator of the PREQ which this PREP | |
534 | * replies | |
535 | */ | |
536 | dst_addr = PREP_IE_DST_ADDR(prep_elem); | |
f698d856 | 537 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) |
050ac52c LCC |
538 | /* destination, no forwarding required */ |
539 | return; | |
540 | ||
541 | ttl = PREP_IE_TTL(prep_elem); | |
542 | if (ttl <= 1) { | |
472dbc45 | 543 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
544 | return; |
545 | } | |
546 | ||
547 | rcu_read_lock(); | |
f698d856 | 548 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
549 | if (mpath) |
550 | spin_lock_bh(&mpath->state_lock); | |
551 | else | |
552 | goto fail; | |
553 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
554 | spin_unlock_bh(&mpath->state_lock); | |
555 | goto fail; | |
556 | } | |
17741cdc | 557 | memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c LCC |
558 | spin_unlock_bh(&mpath->state_lock); |
559 | --ttl; | |
560 | flags = PREP_IE_FLAGS(prep_elem); | |
561 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
562 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
563 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
564 | dst_dsn = PREP_IE_DST_DSN(prep_elem); | |
565 | orig_dsn = PREP_IE_ORIG_DSN(prep_elem); | |
566 | ||
567 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
aa2b5928 | 568 | cpu_to_le32(orig_dsn), 0, dst_addr, |
17741cdc | 569 | cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl, |
aa2b5928 | 570 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 571 | 0, sdata); |
050ac52c | 572 | rcu_read_unlock(); |
c8a61a7d DW |
573 | |
574 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 575 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
576 | return; |
577 | ||
578 | fail: | |
579 | rcu_read_unlock(); | |
472dbc45 | 580 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
581 | return; |
582 | } | |
583 | ||
f698d856 | 584 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
585 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
586 | { | |
587 | struct mesh_path *mpath; | |
588 | u8 *ta, *dst_addr; | |
589 | u32 dst_dsn; | |
590 | ||
591 | ta = mgmt->sa; | |
592 | dst_addr = PERR_IE_DST_ADDR(perr_elem); | |
593 | dst_dsn = PERR_IE_DST_DSN(perr_elem); | |
594 | rcu_read_lock(); | |
f698d856 | 595 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
596 | if (mpath) { |
597 | spin_lock_bh(&mpath->state_lock); | |
598 | if (mpath->flags & MESH_PATH_ACTIVE && | |
17741cdc | 599 | memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 && |
050ac52c LCC |
600 | (!(mpath->flags & MESH_PATH_DSN_VALID) || |
601 | DSN_GT(dst_dsn, mpath->dsn))) { | |
602 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
603 | mpath->dsn = dst_dsn; | |
604 | spin_unlock_bh(&mpath->state_lock); | |
aa2b5928 | 605 | mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn), |
f698d856 | 606 | sdata->dev->broadcast, sdata); |
050ac52c LCC |
607 | } else |
608 | spin_unlock_bh(&mpath->state_lock); | |
609 | } | |
610 | rcu_read_unlock(); | |
611 | } | |
612 | ||
613 | ||
614 | ||
f698d856 | 615 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
616 | struct ieee80211_mgmt *mgmt, |
617 | size_t len) | |
618 | { | |
619 | struct ieee802_11_elems elems; | |
620 | size_t baselen; | |
621 | u32 last_hop_metric; | |
622 | ||
9c80d3dc JB |
623 | /* need action_code */ |
624 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
625 | return; | |
626 | ||
050ac52c LCC |
627 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
628 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
629 | len - baselen, &elems); | |
630 | ||
dbb81c42 RP |
631 | mhwmp_dbg("RX path selection frame\n"); |
632 | if (elems.preq) { | |
633 | if (elems.preq_len != 37) | |
050ac52c LCC |
634 | /* Right now we support just 1 destination and no AE */ |
635 | return; | |
dbb81c42 RP |
636 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
637 | MPATH_PREQ); | |
638 | if (last_hop_metric) | |
639 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
640 | last_hop_metric); | |
641 | } | |
642 | if (elems.prep) { | |
643 | if (elems.prep_len != 31) | |
050ac52c LCC |
644 | /* Right now we support no AE */ |
645 | return; | |
dbb81c42 RP |
646 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
647 | MPATH_PREP); | |
648 | if (last_hop_metric) | |
649 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
650 | last_hop_metric); | |
651 | } | |
652 | if (elems.perr) { | |
653 | if (elems.perr_len != 12) | |
050ac52c LCC |
654 | /* Right now we support only one destination per PERR */ |
655 | return; | |
f698d856 | 656 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c LCC |
657 | } |
658 | ||
659 | } | |
660 | ||
661 | /** | |
662 | * mesh_queue_preq - queue a PREQ to a given destination | |
663 | * | |
664 | * @mpath: mesh path to discover | |
665 | * @flags: special attributes of the PREQ to be sent | |
666 | * | |
667 | * Locking: the function must be called from within a rcu read lock block. | |
668 | * | |
669 | */ | |
670 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
671 | { | |
f698d856 | 672 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 673 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
674 | struct mesh_preq_queue *preq_node; |
675 | ||
59615b5f | 676 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 677 | if (!preq_node) { |
27db2e42 | 678 | mhwmp_dbg("could not allocate PREQ node\n"); |
050ac52c LCC |
679 | return; |
680 | } | |
681 | ||
472dbc45 JB |
682 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
683 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { | |
684 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
685 | kfree(preq_node); |
686 | if (printk_ratelimit()) | |
27db2e42 | 687 | mhwmp_dbg("PREQ node queue full\n"); |
050ac52c LCC |
688 | return; |
689 | } | |
690 | ||
691 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
692 | preq_node->flags = flags; | |
693 | ||
472dbc45 JB |
694 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
695 | ++ifmsh->preq_queue_len; | |
696 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c | 697 | |
472dbc45 | 698 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
c03e20fc | 699 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 700 | |
472dbc45 | 701 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
702 | /* avoid long wait if did not send preqs for a long time |
703 | * and jiffies wrapped around | |
704 | */ | |
472dbc45 | 705 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
c03e20fc | 706 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 707 | } else |
472dbc45 | 708 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
709 | min_preq_int_jiff(sdata)); |
710 | } | |
711 | ||
712 | /** | |
713 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
714 | * | |
f698d856 | 715 | * @sdata: local mesh subif |
050ac52c | 716 | */ |
f698d856 | 717 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 718 | { |
472dbc45 | 719 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
720 | struct mesh_preq_queue *preq_node; |
721 | struct mesh_path *mpath; | |
722 | u8 ttl, dst_flags; | |
723 | u32 lifetime; | |
724 | ||
a43816df | 725 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
726 | if (!ifmsh->preq_queue_len || |
727 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 728 | min_preq_int_jiff(sdata))) { |
a43816df | 729 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
730 | return; |
731 | } | |
732 | ||
472dbc45 | 733 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
734 | struct mesh_preq_queue, list); |
735 | list_del(&preq_node->list); | |
472dbc45 | 736 | --ifmsh->preq_queue_len; |
a43816df | 737 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
738 | |
739 | rcu_read_lock(); | |
f698d856 | 740 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
741 | if (!mpath) |
742 | goto enddiscovery; | |
743 | ||
744 | spin_lock_bh(&mpath->state_lock); | |
745 | if (preq_node->flags & PREQ_Q_F_START) { | |
746 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
747 | spin_unlock_bh(&mpath->state_lock); | |
748 | goto enddiscovery; | |
749 | } else { | |
750 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
751 | mpath->flags |= MESH_PATH_RESOLVING; | |
752 | mpath->discovery_retries = 0; | |
753 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
754 | } | |
755 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
756 | mpath->flags & MESH_PATH_RESOLVED) { | |
757 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
758 | spin_unlock_bh(&mpath->state_lock); | |
759 | goto enddiscovery; | |
760 | } | |
761 | ||
472dbc45 | 762 | ifmsh->last_preq = jiffies; |
050ac52c | 763 | |
472dbc45 | 764 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 765 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
766 | time_before(jiffies, ifmsh->last_dsn_update)) { |
767 | ++ifmsh->dsn; | |
768 | sdata->u.mesh.last_dsn_update = jiffies; | |
050ac52c LCC |
769 | } |
770 | lifetime = default_lifetime(sdata); | |
472dbc45 | 771 | ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
050ac52c | 772 | if (ttl == 0) { |
472dbc45 | 773 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
774 | spin_unlock_bh(&mpath->state_lock); |
775 | goto enddiscovery; | |
776 | } | |
777 | ||
778 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
779 | dst_flags = MP_F_DO; | |
780 | else | |
781 | dst_flags = MP_F_RF; | |
782 | ||
783 | spin_unlock_bh(&mpath->state_lock); | |
f698d856 | 784 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr, |
472dbc45 | 785 | cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst, |
f698d856 | 786 | cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0, |
aa2b5928 | 787 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 788 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
789 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
790 | ||
791 | enddiscovery: | |
792 | rcu_read_unlock(); | |
793 | kfree(preq_node); | |
794 | } | |
795 | ||
796 | /** | |
2182b830 | 797 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame |
050ac52c | 798 | * |
e32f85f7 | 799 | * @skb: 802.11 frame to be sent |
f698d856 | 800 | * @sdata: network subif the frame will be sent through |
050ac52c LCC |
801 | * |
802 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
803 | * found, the function will start a path discovery and queue the frame so it is | |
804 | * sent when the path is resolved. This means the caller must not free the skb | |
805 | * in this case. | |
806 | */ | |
f698d856 JBG |
807 | int mesh_nexthop_lookup(struct sk_buff *skb, |
808 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 809 | { |
050ac52c LCC |
810 | struct sk_buff *skb_to_free = NULL; |
811 | struct mesh_path *mpath; | |
e32f85f7 LCC |
812 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
813 | u8 *dst_addr = hdr->addr3; | |
050ac52c LCC |
814 | int err = 0; |
815 | ||
816 | rcu_read_lock(); | |
f698d856 | 817 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
818 | |
819 | if (!mpath) { | |
f698d856 JBG |
820 | mesh_path_add(dst_addr, sdata); |
821 | mpath = mesh_path_lookup(dst_addr, sdata); | |
050ac52c | 822 | if (!mpath) { |
472dbc45 | 823 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
824 | err = -ENOSPC; |
825 | goto endlookup; | |
826 | } | |
827 | } | |
828 | ||
829 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
a9e3091b | 830 | if (time_after(jiffies, mpath->exp_time + |
472dbc45 | 831 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) |
f698d856 JBG |
832 | && !memcmp(sdata->dev->dev_addr, hdr->addr4, |
833 | ETH_ALEN) | |
050ac52c LCC |
834 | && !(mpath->flags & MESH_PATH_RESOLVING) |
835 | && !(mpath->flags & MESH_PATH_FIXED)) { | |
836 | mesh_queue_preq(mpath, | |
837 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
838 | } | |
17741cdc | 839 | memcpy(hdr->addr1, mpath->next_hop->sta.addr, |
050ac52c LCC |
840 | ETH_ALEN); |
841 | } else { | |
249b405c | 842 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
050ac52c LCC |
843 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { |
844 | /* Start discovery only if it is not running yet */ | |
845 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
846 | } | |
847 | ||
848 | if (skb_queue_len(&mpath->frame_queue) >= | |
fe583434 JC |
849 | MESH_FRAME_QUEUE_LEN) |
850 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
050ac52c | 851 | |
249b405c | 852 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
050ac52c LCC |
853 | skb_queue_tail(&mpath->frame_queue, skb); |
854 | if (skb_to_free) | |
f698d856 | 855 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
856 | err = -ENOENT; |
857 | } | |
858 | ||
859 | endlookup: | |
860 | rcu_read_unlock(); | |
861 | return err; | |
862 | } | |
863 | ||
864 | void mesh_path_timer(unsigned long data) | |
865 | { | |
866 | struct ieee80211_sub_if_data *sdata; | |
867 | struct mesh_path *mpath; | |
050ac52c LCC |
868 | |
869 | rcu_read_lock(); | |
870 | mpath = (struct mesh_path *) data; | |
871 | mpath = rcu_dereference(mpath); | |
872 | if (!mpath) | |
873 | goto endmpathtimer; | |
f698d856 | 874 | sdata = mpath->sdata; |
5bb644a0 JB |
875 | |
876 | if (sdata->local->quiescing) { | |
877 | rcu_read_unlock(); | |
878 | return; | |
879 | } | |
880 | ||
881 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 882 | if (mpath->flags & MESH_PATH_RESOLVED || |
050ac52c LCC |
883 | (!(mpath->flags & MESH_PATH_RESOLVING))) |
884 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); | |
885 | else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
886 | ++mpath->discovery_retries; | |
887 | mpath->discovery_timeout *= 2; | |
888 | mesh_queue_preq(mpath, 0); | |
889 | } else { | |
890 | mpath->flags = 0; | |
891 | mpath->exp_time = jiffies; | |
892 | mesh_path_flush_pending(mpath); | |
893 | } | |
894 | ||
895 | spin_unlock_bh(&mpath->state_lock); | |
896 | endmpathtimer: | |
897 | rcu_read_unlock(); | |
050ac52c | 898 | } |