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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 LCC |
60 | |
61 | #define TU_TO_EXP_TIME(x) (jiffies + msecs_to_jiffies(x * 1024 / 1000)) | |
62 | #define MSEC_TO_TU(x) (x*1000/1024) | |
63 | #define DSN_GT(x, y) ((long) (y) - (long) (x) < 0) | |
64 | #define DSN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
65 | ||
66 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 67 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 68 | #define default_lifetime(s) \ |
472dbc45 | 69 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 70 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
71 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
72 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 73 | #define disc_timeout_jiff(s) \ |
472dbc45 | 74 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
75 | |
76 | enum mpath_frame_type { | |
77 | MPATH_PREQ = 0, | |
78 | MPATH_PREP, | |
79 | MPATH_PERR | |
80 | }; | |
81 | ||
82 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, | |
83 | u8 *orig_addr, __le32 orig_dsn, u8 dst_flags, u8 *dst, | |
84 | __le32 dst_dsn, u8 *da, u8 hop_count, u8 ttl, __le32 lifetime, | |
f698d856 | 85 | __le32 metric, __le32 preq_id, struct ieee80211_sub_if_data *sdata) |
050ac52c | 86 | { |
f698d856 | 87 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
88 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
89 | struct ieee80211_mgmt *mgmt; | |
90 | u8 *pos; | |
91 | int ie_len; | |
92 | ||
93 | if (!skb) | |
94 | return -1; | |
95 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
96 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
97 | * common action part (1) | |
98 | */ | |
99 | mgmt = (struct ieee80211_mgmt *) | |
100 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
101 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
102 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
103 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
104 | |
105 | memcpy(mgmt->da, da, ETH_ALEN); | |
f698d856 | 106 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
050ac52c LCC |
107 | /* BSSID is left zeroed, wildcard value */ |
108 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; | |
109 | mgmt->u.action.u.mesh_action.action_code = action; | |
110 | ||
111 | switch (action) { | |
112 | case MPATH_PREQ: | |
113 | ie_len = 37; | |
114 | pos = skb_put(skb, 2 + ie_len); | |
115 | *pos++ = WLAN_EID_PREQ; | |
116 | break; | |
117 | case MPATH_PREP: | |
118 | ie_len = 31; | |
119 | pos = skb_put(skb, 2 + ie_len); | |
120 | *pos++ = WLAN_EID_PREP; | |
121 | break; | |
122 | default: | |
812714d7 | 123 | kfree_skb(skb); |
050ac52c LCC |
124 | return -ENOTSUPP; |
125 | break; | |
126 | } | |
127 | *pos++ = ie_len; | |
128 | *pos++ = flags; | |
129 | *pos++ = hop_count; | |
130 | *pos++ = ttl; | |
131 | if (action == MPATH_PREQ) { | |
132 | memcpy(pos, &preq_id, 4); | |
133 | pos += 4; | |
134 | } | |
135 | memcpy(pos, orig_addr, ETH_ALEN); | |
136 | pos += ETH_ALEN; | |
137 | memcpy(pos, &orig_dsn, 4); | |
138 | pos += 4; | |
139 | memcpy(pos, &lifetime, 4); | |
140 | pos += 4; | |
141 | memcpy(pos, &metric, 4); | |
142 | pos += 4; | |
143 | if (action == MPATH_PREQ) { | |
144 | /* destination count */ | |
145 | *pos++ = 1; | |
146 | *pos++ = dst_flags; | |
147 | } | |
148 | memcpy(pos, dst, ETH_ALEN); | |
149 | pos += ETH_ALEN; | |
150 | memcpy(pos, &dst_dsn, 4); | |
151 | ||
e50db65c | 152 | ieee80211_tx_skb(sdata, skb, 0); |
050ac52c LCC |
153 | return 0; |
154 | } | |
155 | ||
156 | /** | |
157 | * mesh_send_path error - Sends a PERR mesh management frame | |
158 | * | |
159 | * @dst: broken destination | |
160 | * @dst_dsn: dsn of the broken destination | |
161 | * @ra: node this frame is addressed to | |
162 | */ | |
163 | int mesh_path_error_tx(u8 *dst, __le32 dst_dsn, u8 *ra, | |
f698d856 | 164 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 165 | { |
f698d856 | 166 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
167 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
168 | struct ieee80211_mgmt *mgmt; | |
169 | u8 *pos; | |
170 | int ie_len; | |
171 | ||
172 | if (!skb) | |
173 | return -1; | |
174 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
175 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
176 | * common action part (1) | |
177 | */ | |
178 | mgmt = (struct ieee80211_mgmt *) | |
179 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
180 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
181 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
182 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
183 | |
184 | memcpy(mgmt->da, ra, ETH_ALEN); | |
f698d856 | 185 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
050ac52c LCC |
186 | /* BSSID is left zeroed, wildcard value */ |
187 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; | |
188 | mgmt->u.action.u.mesh_action.action_code = MPATH_PERR; | |
189 | ie_len = 12; | |
190 | pos = skb_put(skb, 2 + ie_len); | |
191 | *pos++ = WLAN_EID_PERR; | |
192 | *pos++ = ie_len; | |
193 | /* mode flags, reserved */ | |
194 | *pos++ = 0; | |
195 | /* number of destinations */ | |
196 | *pos++ = 1; | |
197 | memcpy(pos, dst, ETH_ALEN); | |
198 | pos += ETH_ALEN; | |
199 | memcpy(pos, &dst_dsn, 4); | |
200 | ||
e50db65c | 201 | ieee80211_tx_skb(sdata, skb, 0); |
050ac52c LCC |
202 | return 0; |
203 | } | |
204 | ||
205 | static u32 airtime_link_metric_get(struct ieee80211_local *local, | |
206 | struct sta_info *sta) | |
207 | { | |
208 | struct ieee80211_supported_band *sband; | |
209 | /* This should be adjusted for each device */ | |
210 | int device_constant = 1 << ARITH_SHIFT; | |
211 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
212 | int s_unit = 1 << ARITH_SHIFT; | |
213 | int rate, err; | |
214 | u32 tx_time, estimated_retx; | |
215 | u64 result; | |
216 | ||
217 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
218 | ||
219 | if (sta->fail_avg >= 100) | |
220 | return MAX_METRIC; | |
e6a9854b JB |
221 | |
222 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
223 | return MAX_METRIC; | |
224 | ||
050ac52c LCC |
225 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
226 | ||
227 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
228 | * 1Mbps. This will be corrected on tx_time computation. | |
229 | */ | |
e6a9854b | 230 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
231 | tx_time = (device_constant + 10 * test_frame_len / rate); |
232 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
233 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
234 | return (u32)result; | |
235 | } | |
236 | ||
237 | /** | |
238 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
239 | * | |
f698d856 | 240 | * @sdata: local mesh subif |
050ac52c LCC |
241 | * @mgmt: mesh management frame |
242 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
243 | * | |
244 | * This function updates the path routing information to the originator and the | |
245 | * transmitter of a HWMP PREQ or PREP fram. | |
246 | * | |
247 | * Returns: metric to frame originator or 0 if the frame should not be further | |
248 | * processed | |
249 | * | |
250 | * Notes: this function is the only place (besides user-provided info) where | |
251 | * path routing information is updated. | |
252 | */ | |
f698d856 | 253 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
254 | struct ieee80211_mgmt *mgmt, |
255 | u8 *hwmp_ie) | |
256 | { | |
f698d856 | 257 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
258 | struct mesh_path *mpath; |
259 | struct sta_info *sta; | |
260 | bool fresh_info; | |
261 | u8 *orig_addr, *ta; | |
262 | u32 orig_dsn, orig_metric; | |
263 | unsigned long orig_lifetime, exp_time; | |
264 | u32 last_hop_metric, new_metric; | |
265 | bool process = true; | |
266 | u8 action = mgmt->u.action.u.mesh_action.action_code; | |
267 | ||
268 | rcu_read_lock(); | |
269 | sta = sta_info_get(local, mgmt->sa); | |
dc0b0f7d JB |
270 | if (!sta) { |
271 | rcu_read_unlock(); | |
050ac52c | 272 | return 0; |
dc0b0f7d | 273 | } |
050ac52c LCC |
274 | |
275 | last_hop_metric = airtime_link_metric_get(local, sta); | |
276 | /* Update and check originator routing info */ | |
277 | fresh_info = true; | |
278 | ||
279 | switch (action) { | |
280 | case MPATH_PREQ: | |
281 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
282 | orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie); | |
283 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); | |
284 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
285 | break; | |
286 | case MPATH_PREP: | |
287 | /* Originator here refers to the MP that was the destination in | |
288 | * the Path Request. The draft refers to that MP as the | |
289 | * destination address, even though usually it is the origin of | |
290 | * the PREP frame. We divert from the nomenclature in the draft | |
291 | * so that we can easily use a single function to gather path | |
292 | * information from both PREQ and PREP frames. | |
293 | */ | |
294 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
295 | orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie); | |
296 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); | |
297 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
298 | break; | |
299 | default: | |
dc0b0f7d | 300 | rcu_read_unlock(); |
050ac52c LCC |
301 | return 0; |
302 | } | |
303 | new_metric = orig_metric + last_hop_metric; | |
304 | if (new_metric < orig_metric) | |
305 | new_metric = MAX_METRIC; | |
306 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
307 | ||
f698d856 | 308 | if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
309 | /* This MP is the originator, we are not interested in this |
310 | * frame, except for updating transmitter's path info. | |
311 | */ | |
312 | process = false; | |
313 | fresh_info = false; | |
314 | } else { | |
f698d856 | 315 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
316 | if (mpath) { |
317 | spin_lock_bh(&mpath->state_lock); | |
318 | if (mpath->flags & MESH_PATH_FIXED) | |
319 | fresh_info = false; | |
320 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
321 | (mpath->flags & MESH_PATH_DSN_VALID)) { | |
322 | if (DSN_GT(mpath->dsn, orig_dsn) || | |
323 | (mpath->dsn == orig_dsn && | |
324 | action == MPATH_PREQ && | |
325 | new_metric > mpath->metric)) { | |
326 | process = false; | |
327 | fresh_info = false; | |
328 | } | |
329 | } | |
330 | } else { | |
f698d856 JBG |
331 | mesh_path_add(orig_addr, sdata); |
332 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
333 | if (!mpath) { |
334 | rcu_read_unlock(); | |
050ac52c LCC |
335 | return 0; |
336 | } | |
337 | spin_lock_bh(&mpath->state_lock); | |
338 | } | |
339 | ||
340 | if (fresh_info) { | |
341 | mesh_path_assign_nexthop(mpath, sta); | |
342 | mpath->flags |= MESH_PATH_DSN_VALID; | |
343 | mpath->metric = new_metric; | |
344 | mpath->dsn = orig_dsn; | |
345 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
346 | ? mpath->exp_time : exp_time; | |
347 | mesh_path_activate(mpath); | |
348 | spin_unlock_bh(&mpath->state_lock); | |
349 | mesh_path_tx_pending(mpath); | |
350 | /* draft says preq_id should be saved to, but there does | |
351 | * not seem to be any use for it, skipping by now | |
352 | */ | |
353 | } else | |
354 | spin_unlock_bh(&mpath->state_lock); | |
355 | } | |
356 | ||
357 | /* Update and check transmitter routing info */ | |
358 | ta = mgmt->sa; | |
359 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
360 | fresh_info = false; | |
361 | else { | |
362 | fresh_info = true; | |
363 | ||
f698d856 | 364 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
365 | if (mpath) { |
366 | spin_lock_bh(&mpath->state_lock); | |
367 | if ((mpath->flags & MESH_PATH_FIXED) || | |
368 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
369 | (last_hop_metric > mpath->metric))) | |
370 | fresh_info = false; | |
371 | } else { | |
f698d856 JBG |
372 | mesh_path_add(ta, sdata); |
373 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
374 | if (!mpath) { |
375 | rcu_read_unlock(); | |
050ac52c LCC |
376 | return 0; |
377 | } | |
378 | spin_lock_bh(&mpath->state_lock); | |
379 | } | |
380 | ||
381 | if (fresh_info) { | |
382 | mesh_path_assign_nexthop(mpath, sta); | |
383 | mpath->flags &= ~MESH_PATH_DSN_VALID; | |
384 | mpath->metric = last_hop_metric; | |
385 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
386 | ? mpath->exp_time : exp_time; | |
387 | mesh_path_activate(mpath); | |
388 | spin_unlock_bh(&mpath->state_lock); | |
389 | mesh_path_tx_pending(mpath); | |
390 | } else | |
391 | spin_unlock_bh(&mpath->state_lock); | |
392 | } | |
393 | ||
050ac52c LCC |
394 | rcu_read_unlock(); |
395 | ||
396 | return process ? new_metric : 0; | |
397 | } | |
398 | ||
f698d856 | 399 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
400 | struct ieee80211_mgmt *mgmt, |
401 | u8 *preq_elem, u32 metric) { | |
472dbc45 | 402 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
403 | struct mesh_path *mpath; |
404 | u8 *dst_addr, *orig_addr; | |
405 | u8 dst_flags, ttl; | |
406 | u32 orig_dsn, dst_dsn, lifetime; | |
407 | bool reply = false; | |
408 | bool forward = true; | |
409 | ||
410 | /* Update destination DSN, if present */ | |
411 | dst_addr = PREQ_IE_DST_ADDR(preq_elem); | |
412 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); | |
413 | dst_dsn = PREQ_IE_DST_DSN(preq_elem); | |
414 | orig_dsn = PREQ_IE_ORIG_DSN(preq_elem); | |
415 | dst_flags = PREQ_IE_DST_F(preq_elem); | |
416 | ||
f698d856 | 417 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
418 | forward = false; |
419 | reply = true; | |
420 | metric = 0; | |
472dbc45 | 421 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 422 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
423 | time_before(jiffies, ifmsh->last_dsn_update)) { |
424 | dst_dsn = ++ifmsh->dsn; | |
425 | ifmsh->last_dsn_update = jiffies; | |
050ac52c LCC |
426 | } |
427 | } else { | |
428 | rcu_read_lock(); | |
f698d856 | 429 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
430 | if (mpath) { |
431 | if ((!(mpath->flags & MESH_PATH_DSN_VALID)) || | |
432 | DSN_LT(mpath->dsn, dst_dsn)) { | |
433 | mpath->dsn = dst_dsn; | |
434 | mpath->flags &= MESH_PATH_DSN_VALID; | |
435 | } else if ((!(dst_flags & MP_F_DO)) && | |
436 | (mpath->flags & MESH_PATH_ACTIVE)) { | |
437 | reply = true; | |
438 | metric = mpath->metric; | |
439 | dst_dsn = mpath->dsn; | |
440 | if (dst_flags & MP_F_RF) | |
441 | dst_flags |= MP_F_DO; | |
442 | else | |
443 | forward = false; | |
444 | } | |
445 | } | |
446 | rcu_read_unlock(); | |
447 | } | |
448 | ||
449 | if (reply) { | |
450 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
472dbc45 | 451 | ttl = ifmsh->mshcfg.dot11MeshTTL; |
050ac52c LCC |
452 | if (ttl != 0) |
453 | mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr, | |
aa2b5928 LCC |
454 | cpu_to_le32(dst_dsn), 0, orig_addr, |
455 | cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl, | |
456 | cpu_to_le32(lifetime), cpu_to_le32(metric), | |
f698d856 | 457 | 0, sdata); |
050ac52c | 458 | else |
472dbc45 | 459 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
460 | } |
461 | ||
462 | if (forward) { | |
463 | u32 preq_id; | |
464 | u8 hopcount, flags; | |
465 | ||
466 | ttl = PREQ_IE_TTL(preq_elem); | |
467 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
468 | if (ttl <= 1) { | |
472dbc45 | 469 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
470 | return; |
471 | } | |
472 | --ttl; | |
473 | flags = PREQ_IE_FLAGS(preq_elem); | |
474 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
475 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
476 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
aa2b5928 | 477 | cpu_to_le32(orig_dsn), dst_flags, dst_addr, |
f698d856 | 478 | cpu_to_le32(dst_dsn), sdata->dev->broadcast, |
aa2b5928 LCC |
479 | hopcount, ttl, cpu_to_le32(lifetime), |
480 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 481 | sdata); |
472dbc45 | 482 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
483 | } |
484 | } | |
485 | ||
486 | ||
f698d856 | 487 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
488 | struct ieee80211_mgmt *mgmt, |
489 | u8 *prep_elem, u32 metric) | |
490 | { | |
050ac52c LCC |
491 | struct mesh_path *mpath; |
492 | u8 *dst_addr, *orig_addr; | |
493 | u8 ttl, hopcount, flags; | |
494 | u8 next_hop[ETH_ALEN]; | |
495 | u32 dst_dsn, orig_dsn, lifetime; | |
496 | ||
497 | /* Note that we divert from the draft nomenclature and denominate | |
498 | * destination to what the draft refers to as origininator. So in this | |
499 | * function destnation refers to the final destination of the PREP, | |
500 | * which corresponds with the originator of the PREQ which this PREP | |
501 | * replies | |
502 | */ | |
503 | dst_addr = PREP_IE_DST_ADDR(prep_elem); | |
f698d856 | 504 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) |
050ac52c LCC |
505 | /* destination, no forwarding required */ |
506 | return; | |
507 | ||
508 | ttl = PREP_IE_TTL(prep_elem); | |
509 | if (ttl <= 1) { | |
472dbc45 | 510 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
511 | return; |
512 | } | |
513 | ||
514 | rcu_read_lock(); | |
f698d856 | 515 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
516 | if (mpath) |
517 | spin_lock_bh(&mpath->state_lock); | |
518 | else | |
519 | goto fail; | |
520 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
521 | spin_unlock_bh(&mpath->state_lock); | |
522 | goto fail; | |
523 | } | |
17741cdc | 524 | memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c LCC |
525 | spin_unlock_bh(&mpath->state_lock); |
526 | --ttl; | |
527 | flags = PREP_IE_FLAGS(prep_elem); | |
528 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
529 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
530 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
531 | dst_dsn = PREP_IE_DST_DSN(prep_elem); | |
532 | orig_dsn = PREP_IE_ORIG_DSN(prep_elem); | |
533 | ||
534 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
aa2b5928 | 535 | cpu_to_le32(orig_dsn), 0, dst_addr, |
17741cdc | 536 | cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl, |
aa2b5928 | 537 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 538 | 0, sdata); |
050ac52c | 539 | rcu_read_unlock(); |
472dbc45 | 540 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
541 | return; |
542 | ||
543 | fail: | |
544 | rcu_read_unlock(); | |
472dbc45 | 545 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
546 | return; |
547 | } | |
548 | ||
f698d856 | 549 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
550 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
551 | { | |
552 | struct mesh_path *mpath; | |
553 | u8 *ta, *dst_addr; | |
554 | u32 dst_dsn; | |
555 | ||
556 | ta = mgmt->sa; | |
557 | dst_addr = PERR_IE_DST_ADDR(perr_elem); | |
558 | dst_dsn = PERR_IE_DST_DSN(perr_elem); | |
559 | rcu_read_lock(); | |
f698d856 | 560 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
561 | if (mpath) { |
562 | spin_lock_bh(&mpath->state_lock); | |
563 | if (mpath->flags & MESH_PATH_ACTIVE && | |
17741cdc | 564 | memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 && |
050ac52c LCC |
565 | (!(mpath->flags & MESH_PATH_DSN_VALID) || |
566 | DSN_GT(dst_dsn, mpath->dsn))) { | |
567 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
568 | mpath->dsn = dst_dsn; | |
569 | spin_unlock_bh(&mpath->state_lock); | |
aa2b5928 | 570 | mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn), |
f698d856 | 571 | sdata->dev->broadcast, sdata); |
050ac52c LCC |
572 | } else |
573 | spin_unlock_bh(&mpath->state_lock); | |
574 | } | |
575 | rcu_read_unlock(); | |
576 | } | |
577 | ||
578 | ||
579 | ||
f698d856 | 580 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
581 | struct ieee80211_mgmt *mgmt, |
582 | size_t len) | |
583 | { | |
584 | struct ieee802_11_elems elems; | |
585 | size_t baselen; | |
586 | u32 last_hop_metric; | |
587 | ||
9c80d3dc JB |
588 | /* need action_code */ |
589 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
590 | return; | |
591 | ||
050ac52c LCC |
592 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
593 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
594 | len - baselen, &elems); | |
595 | ||
596 | switch (mgmt->u.action.u.mesh_action.action_code) { | |
597 | case MPATH_PREQ: | |
598 | if (!elems.preq || elems.preq_len != 37) | |
599 | /* Right now we support just 1 destination and no AE */ | |
600 | return; | |
f698d856 | 601 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq); |
050ac52c LCC |
602 | if (!last_hop_metric) |
603 | return; | |
f698d856 | 604 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, last_hop_metric); |
050ac52c LCC |
605 | break; |
606 | case MPATH_PREP: | |
607 | if (!elems.prep || elems.prep_len != 31) | |
608 | /* Right now we support no AE */ | |
609 | return; | |
f698d856 | 610 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep); |
050ac52c LCC |
611 | if (!last_hop_metric) |
612 | return; | |
f698d856 | 613 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, last_hop_metric); |
050ac52c LCC |
614 | break; |
615 | case MPATH_PERR: | |
616 | if (!elems.perr || elems.perr_len != 12) | |
617 | /* Right now we support only one destination per PERR */ | |
618 | return; | |
f698d856 | 619 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c LCC |
620 | default: |
621 | return; | |
622 | } | |
623 | ||
624 | } | |
625 | ||
626 | /** | |
627 | * mesh_queue_preq - queue a PREQ to a given destination | |
628 | * | |
629 | * @mpath: mesh path to discover | |
630 | * @flags: special attributes of the PREQ to be sent | |
631 | * | |
632 | * Locking: the function must be called from within a rcu read lock block. | |
633 | * | |
634 | */ | |
635 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
636 | { | |
f698d856 | 637 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 638 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
639 | struct mesh_preq_queue *preq_node; |
640 | ||
641 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_KERNEL); | |
642 | if (!preq_node) { | |
643 | printk(KERN_DEBUG "Mesh HWMP: could not allocate PREQ node\n"); | |
644 | return; | |
645 | } | |
646 | ||
472dbc45 JB |
647 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
648 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { | |
649 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
650 | kfree(preq_node); |
651 | if (printk_ratelimit()) | |
652 | printk(KERN_DEBUG "Mesh HWMP: PREQ node queue full\n"); | |
653 | return; | |
654 | } | |
655 | ||
656 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
657 | preq_node->flags = flags; | |
658 | ||
472dbc45 JB |
659 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
660 | ++ifmsh->preq_queue_len; | |
661 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c | 662 | |
472dbc45 JB |
663 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
664 | queue_work(sdata->local->hw.workqueue, &ifmsh->work); | |
050ac52c | 665 | |
472dbc45 | 666 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
667 | /* avoid long wait if did not send preqs for a long time |
668 | * and jiffies wrapped around | |
669 | */ | |
472dbc45 JB |
670 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
671 | queue_work(sdata->local->hw.workqueue, &ifmsh->work); | |
050ac52c | 672 | } else |
472dbc45 | 673 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
674 | min_preq_int_jiff(sdata)); |
675 | } | |
676 | ||
677 | /** | |
678 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
679 | * | |
f698d856 | 680 | * @sdata: local mesh subif |
050ac52c | 681 | */ |
f698d856 | 682 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 683 | { |
472dbc45 | 684 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
685 | struct mesh_preq_queue *preq_node; |
686 | struct mesh_path *mpath; | |
687 | u8 ttl, dst_flags; | |
688 | u32 lifetime; | |
689 | ||
472dbc45 JB |
690 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
691 | if (!ifmsh->preq_queue_len || | |
692 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 693 | min_preq_int_jiff(sdata))) { |
472dbc45 | 694 | spin_unlock(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
695 | return; |
696 | } | |
697 | ||
472dbc45 | 698 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
699 | struct mesh_preq_queue, list); |
700 | list_del(&preq_node->list); | |
472dbc45 JB |
701 | --ifmsh->preq_queue_len; |
702 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
703 | |
704 | rcu_read_lock(); | |
f698d856 | 705 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
706 | if (!mpath) |
707 | goto enddiscovery; | |
708 | ||
709 | spin_lock_bh(&mpath->state_lock); | |
710 | if (preq_node->flags & PREQ_Q_F_START) { | |
711 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
712 | spin_unlock_bh(&mpath->state_lock); | |
713 | goto enddiscovery; | |
714 | } else { | |
715 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
716 | mpath->flags |= MESH_PATH_RESOLVING; | |
717 | mpath->discovery_retries = 0; | |
718 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
719 | } | |
720 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
721 | mpath->flags & MESH_PATH_RESOLVED) { | |
722 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
723 | spin_unlock_bh(&mpath->state_lock); | |
724 | goto enddiscovery; | |
725 | } | |
726 | ||
472dbc45 | 727 | ifmsh->last_preq = jiffies; |
050ac52c | 728 | |
472dbc45 | 729 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 730 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
731 | time_before(jiffies, ifmsh->last_dsn_update)) { |
732 | ++ifmsh->dsn; | |
733 | sdata->u.mesh.last_dsn_update = jiffies; | |
050ac52c LCC |
734 | } |
735 | lifetime = default_lifetime(sdata); | |
472dbc45 | 736 | ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
050ac52c | 737 | if (ttl == 0) { |
472dbc45 | 738 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
739 | spin_unlock_bh(&mpath->state_lock); |
740 | goto enddiscovery; | |
741 | } | |
742 | ||
743 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
744 | dst_flags = MP_F_DO; | |
745 | else | |
746 | dst_flags = MP_F_RF; | |
747 | ||
748 | spin_unlock_bh(&mpath->state_lock); | |
f698d856 | 749 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr, |
472dbc45 | 750 | cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst, |
f698d856 | 751 | cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0, |
aa2b5928 | 752 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 753 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
754 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
755 | ||
756 | enddiscovery: | |
757 | rcu_read_unlock(); | |
758 | kfree(preq_node); | |
759 | } | |
760 | ||
761 | /** | |
762 | * ieee80211s_lookup_nexthop - put the appropriate next hop on a mesh frame | |
763 | * | |
e32f85f7 | 764 | * @skb: 802.11 frame to be sent |
f698d856 | 765 | * @sdata: network subif the frame will be sent through |
050ac52c LCC |
766 | * |
767 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
768 | * found, the function will start a path discovery and queue the frame so it is | |
769 | * sent when the path is resolved. This means the caller must not free the skb | |
770 | * in this case. | |
771 | */ | |
f698d856 JBG |
772 | int mesh_nexthop_lookup(struct sk_buff *skb, |
773 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 774 | { |
050ac52c LCC |
775 | struct sk_buff *skb_to_free = NULL; |
776 | struct mesh_path *mpath; | |
e32f85f7 LCC |
777 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
778 | u8 *dst_addr = hdr->addr3; | |
050ac52c LCC |
779 | int err = 0; |
780 | ||
781 | rcu_read_lock(); | |
f698d856 | 782 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
783 | |
784 | if (!mpath) { | |
f698d856 JBG |
785 | mesh_path_add(dst_addr, sdata); |
786 | mpath = mesh_path_lookup(dst_addr, sdata); | |
050ac52c LCC |
787 | if (!mpath) { |
788 | dev_kfree_skb(skb); | |
472dbc45 | 789 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
790 | err = -ENOSPC; |
791 | goto endlookup; | |
792 | } | |
793 | } | |
794 | ||
795 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
796 | if (time_after(jiffies, mpath->exp_time - | |
472dbc45 | 797 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) |
f698d856 JBG |
798 | && !memcmp(sdata->dev->dev_addr, hdr->addr4, |
799 | ETH_ALEN) | |
050ac52c LCC |
800 | && !(mpath->flags & MESH_PATH_RESOLVING) |
801 | && !(mpath->flags & MESH_PATH_FIXED)) { | |
802 | mesh_queue_preq(mpath, | |
803 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
804 | } | |
17741cdc | 805 | memcpy(hdr->addr1, mpath->next_hop->sta.addr, |
050ac52c LCC |
806 | ETH_ALEN); |
807 | } else { | |
808 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { | |
809 | /* Start discovery only if it is not running yet */ | |
810 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
811 | } | |
812 | ||
813 | if (skb_queue_len(&mpath->frame_queue) >= | |
814 | MESH_FRAME_QUEUE_LEN) { | |
815 | skb_to_free = mpath->frame_queue.next; | |
816 | skb_unlink(skb_to_free, &mpath->frame_queue); | |
817 | } | |
818 | ||
819 | skb_queue_tail(&mpath->frame_queue, skb); | |
820 | if (skb_to_free) | |
f698d856 | 821 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
822 | err = -ENOENT; |
823 | } | |
824 | ||
825 | endlookup: | |
826 | rcu_read_unlock(); | |
827 | return err; | |
828 | } | |
829 | ||
830 | void mesh_path_timer(unsigned long data) | |
831 | { | |
832 | struct ieee80211_sub_if_data *sdata; | |
833 | struct mesh_path *mpath; | |
050ac52c LCC |
834 | |
835 | rcu_read_lock(); | |
836 | mpath = (struct mesh_path *) data; | |
837 | mpath = rcu_dereference(mpath); | |
838 | if (!mpath) | |
839 | goto endmpathtimer; | |
840 | spin_lock_bh(&mpath->state_lock); | |
f698d856 | 841 | sdata = mpath->sdata; |
cfa22c71 | 842 | if (mpath->flags & MESH_PATH_RESOLVED || |
050ac52c LCC |
843 | (!(mpath->flags & MESH_PATH_RESOLVING))) |
844 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); | |
845 | else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
846 | ++mpath->discovery_retries; | |
847 | mpath->discovery_timeout *= 2; | |
848 | mesh_queue_preq(mpath, 0); | |
849 | } else { | |
850 | mpath->flags = 0; | |
851 | mpath->exp_time = jiffies; | |
852 | mesh_path_flush_pending(mpath); | |
853 | } | |
854 | ||
855 | spin_unlock_bh(&mpath->state_lock); | |
856 | endmpathtimer: | |
857 | rcu_read_unlock(); | |
050ac52c | 858 | } |