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