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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; | |
221 | err = (sta->fail_avg << ARITH_SHIFT) / 100; | |
222 | ||
223 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
224 | * 1Mbps. This will be corrected on tx_time computation. | |
225 | */ | |
ae17e986 | 226 | rate = sband->bitrates[sta->last_txrate_idx].bitrate; |
050ac52c LCC |
227 | tx_time = (device_constant + 10 * test_frame_len / rate); |
228 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
229 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
230 | return (u32)result; | |
231 | } | |
232 | ||
233 | /** | |
234 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
235 | * | |
f698d856 | 236 | * @sdata: local mesh subif |
050ac52c LCC |
237 | * @mgmt: mesh management frame |
238 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
239 | * | |
240 | * This function updates the path routing information to the originator and the | |
241 | * transmitter of a HWMP PREQ or PREP fram. | |
242 | * | |
243 | * Returns: metric to frame originator or 0 if the frame should not be further | |
244 | * processed | |
245 | * | |
246 | * Notes: this function is the only place (besides user-provided info) where | |
247 | * path routing information is updated. | |
248 | */ | |
f698d856 | 249 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
250 | struct ieee80211_mgmt *mgmt, |
251 | u8 *hwmp_ie) | |
252 | { | |
f698d856 | 253 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
254 | struct mesh_path *mpath; |
255 | struct sta_info *sta; | |
256 | bool fresh_info; | |
257 | u8 *orig_addr, *ta; | |
258 | u32 orig_dsn, orig_metric; | |
259 | unsigned long orig_lifetime, exp_time; | |
260 | u32 last_hop_metric, new_metric; | |
261 | bool process = true; | |
262 | u8 action = mgmt->u.action.u.mesh_action.action_code; | |
263 | ||
264 | rcu_read_lock(); | |
265 | sta = sta_info_get(local, mgmt->sa); | |
dc0b0f7d JB |
266 | if (!sta) { |
267 | rcu_read_unlock(); | |
050ac52c | 268 | return 0; |
dc0b0f7d | 269 | } |
050ac52c LCC |
270 | |
271 | last_hop_metric = airtime_link_metric_get(local, sta); | |
272 | /* Update and check originator routing info */ | |
273 | fresh_info = true; | |
274 | ||
275 | switch (action) { | |
276 | case MPATH_PREQ: | |
277 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
278 | orig_dsn = PREQ_IE_ORIG_DSN(hwmp_ie); | |
279 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); | |
280 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
281 | break; | |
282 | case MPATH_PREP: | |
283 | /* Originator here refers to the MP that was the destination in | |
284 | * the Path Request. The draft refers to that MP as the | |
285 | * destination address, even though usually it is the origin of | |
286 | * the PREP frame. We divert from the nomenclature in the draft | |
287 | * so that we can easily use a single function to gather path | |
288 | * information from both PREQ and PREP frames. | |
289 | */ | |
290 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
291 | orig_dsn = PREP_IE_ORIG_DSN(hwmp_ie); | |
292 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); | |
293 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
294 | break; | |
295 | default: | |
dc0b0f7d | 296 | rcu_read_unlock(); |
050ac52c LCC |
297 | return 0; |
298 | } | |
299 | new_metric = orig_metric + last_hop_metric; | |
300 | if (new_metric < orig_metric) | |
301 | new_metric = MAX_METRIC; | |
302 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
303 | ||
f698d856 | 304 | if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
305 | /* This MP is the originator, we are not interested in this |
306 | * frame, except for updating transmitter's path info. | |
307 | */ | |
308 | process = false; | |
309 | fresh_info = false; | |
310 | } else { | |
f698d856 | 311 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
312 | if (mpath) { |
313 | spin_lock_bh(&mpath->state_lock); | |
314 | if (mpath->flags & MESH_PATH_FIXED) | |
315 | fresh_info = false; | |
316 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
317 | (mpath->flags & MESH_PATH_DSN_VALID)) { | |
318 | if (DSN_GT(mpath->dsn, orig_dsn) || | |
319 | (mpath->dsn == orig_dsn && | |
320 | action == MPATH_PREQ && | |
321 | new_metric > mpath->metric)) { | |
322 | process = false; | |
323 | fresh_info = false; | |
324 | } | |
325 | } | |
326 | } else { | |
f698d856 JBG |
327 | mesh_path_add(orig_addr, sdata); |
328 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
329 | if (!mpath) { |
330 | rcu_read_unlock(); | |
050ac52c LCC |
331 | return 0; |
332 | } | |
333 | spin_lock_bh(&mpath->state_lock); | |
334 | } | |
335 | ||
336 | if (fresh_info) { | |
337 | mesh_path_assign_nexthop(mpath, sta); | |
338 | mpath->flags |= MESH_PATH_DSN_VALID; | |
339 | mpath->metric = new_metric; | |
340 | mpath->dsn = orig_dsn; | |
341 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
342 | ? mpath->exp_time : exp_time; | |
343 | mesh_path_activate(mpath); | |
344 | spin_unlock_bh(&mpath->state_lock); | |
345 | mesh_path_tx_pending(mpath); | |
346 | /* draft says preq_id should be saved to, but there does | |
347 | * not seem to be any use for it, skipping by now | |
348 | */ | |
349 | } else | |
350 | spin_unlock_bh(&mpath->state_lock); | |
351 | } | |
352 | ||
353 | /* Update and check transmitter routing info */ | |
354 | ta = mgmt->sa; | |
355 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
356 | fresh_info = false; | |
357 | else { | |
358 | fresh_info = true; | |
359 | ||
f698d856 | 360 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
361 | if (mpath) { |
362 | spin_lock_bh(&mpath->state_lock); | |
363 | if ((mpath->flags & MESH_PATH_FIXED) || | |
364 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
365 | (last_hop_metric > mpath->metric))) | |
366 | fresh_info = false; | |
367 | } else { | |
f698d856 JBG |
368 | mesh_path_add(ta, sdata); |
369 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
370 | if (!mpath) { |
371 | rcu_read_unlock(); | |
050ac52c LCC |
372 | return 0; |
373 | } | |
374 | spin_lock_bh(&mpath->state_lock); | |
375 | } | |
376 | ||
377 | if (fresh_info) { | |
378 | mesh_path_assign_nexthop(mpath, sta); | |
379 | mpath->flags &= ~MESH_PATH_DSN_VALID; | |
380 | mpath->metric = last_hop_metric; | |
381 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
382 | ? mpath->exp_time : exp_time; | |
383 | mesh_path_activate(mpath); | |
384 | spin_unlock_bh(&mpath->state_lock); | |
385 | mesh_path_tx_pending(mpath); | |
386 | } else | |
387 | spin_unlock_bh(&mpath->state_lock); | |
388 | } | |
389 | ||
050ac52c LCC |
390 | rcu_read_unlock(); |
391 | ||
392 | return process ? new_metric : 0; | |
393 | } | |
394 | ||
f698d856 | 395 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
396 | struct ieee80211_mgmt *mgmt, |
397 | u8 *preq_elem, u32 metric) { | |
472dbc45 | 398 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
399 | struct mesh_path *mpath; |
400 | u8 *dst_addr, *orig_addr; | |
401 | u8 dst_flags, ttl; | |
402 | u32 orig_dsn, dst_dsn, lifetime; | |
403 | bool reply = false; | |
404 | bool forward = true; | |
405 | ||
406 | /* Update destination DSN, if present */ | |
407 | dst_addr = PREQ_IE_DST_ADDR(preq_elem); | |
408 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); | |
409 | dst_dsn = PREQ_IE_DST_DSN(preq_elem); | |
410 | orig_dsn = PREQ_IE_ORIG_DSN(preq_elem); | |
411 | dst_flags = PREQ_IE_DST_F(preq_elem); | |
412 | ||
f698d856 | 413 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
414 | forward = false; |
415 | reply = true; | |
416 | metric = 0; | |
472dbc45 | 417 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 418 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
419 | time_before(jiffies, ifmsh->last_dsn_update)) { |
420 | dst_dsn = ++ifmsh->dsn; | |
421 | ifmsh->last_dsn_update = jiffies; | |
050ac52c LCC |
422 | } |
423 | } else { | |
424 | rcu_read_lock(); | |
f698d856 | 425 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
426 | if (mpath) { |
427 | if ((!(mpath->flags & MESH_PATH_DSN_VALID)) || | |
428 | DSN_LT(mpath->dsn, dst_dsn)) { | |
429 | mpath->dsn = dst_dsn; | |
430 | mpath->flags &= MESH_PATH_DSN_VALID; | |
431 | } else if ((!(dst_flags & MP_F_DO)) && | |
432 | (mpath->flags & MESH_PATH_ACTIVE)) { | |
433 | reply = true; | |
434 | metric = mpath->metric; | |
435 | dst_dsn = mpath->dsn; | |
436 | if (dst_flags & MP_F_RF) | |
437 | dst_flags |= MP_F_DO; | |
438 | else | |
439 | forward = false; | |
440 | } | |
441 | } | |
442 | rcu_read_unlock(); | |
443 | } | |
444 | ||
445 | if (reply) { | |
446 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
472dbc45 | 447 | ttl = ifmsh->mshcfg.dot11MeshTTL; |
050ac52c LCC |
448 | if (ttl != 0) |
449 | mesh_path_sel_frame_tx(MPATH_PREP, 0, dst_addr, | |
aa2b5928 LCC |
450 | cpu_to_le32(dst_dsn), 0, orig_addr, |
451 | cpu_to_le32(orig_dsn), mgmt->sa, 0, ttl, | |
452 | cpu_to_le32(lifetime), cpu_to_le32(metric), | |
f698d856 | 453 | 0, sdata); |
050ac52c | 454 | else |
472dbc45 | 455 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
456 | } |
457 | ||
458 | if (forward) { | |
459 | u32 preq_id; | |
460 | u8 hopcount, flags; | |
461 | ||
462 | ttl = PREQ_IE_TTL(preq_elem); | |
463 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
464 | if (ttl <= 1) { | |
472dbc45 | 465 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
466 | return; |
467 | } | |
468 | --ttl; | |
469 | flags = PREQ_IE_FLAGS(preq_elem); | |
470 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
471 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
472 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
aa2b5928 | 473 | cpu_to_le32(orig_dsn), dst_flags, dst_addr, |
f698d856 | 474 | cpu_to_le32(dst_dsn), sdata->dev->broadcast, |
aa2b5928 LCC |
475 | hopcount, ttl, cpu_to_le32(lifetime), |
476 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 477 | sdata); |
472dbc45 | 478 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
479 | } |
480 | } | |
481 | ||
482 | ||
f698d856 | 483 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
484 | struct ieee80211_mgmt *mgmt, |
485 | u8 *prep_elem, u32 metric) | |
486 | { | |
050ac52c LCC |
487 | struct mesh_path *mpath; |
488 | u8 *dst_addr, *orig_addr; | |
489 | u8 ttl, hopcount, flags; | |
490 | u8 next_hop[ETH_ALEN]; | |
491 | u32 dst_dsn, orig_dsn, lifetime; | |
492 | ||
493 | /* Note that we divert from the draft nomenclature and denominate | |
494 | * destination to what the draft refers to as origininator. So in this | |
495 | * function destnation refers to the final destination of the PREP, | |
496 | * which corresponds with the originator of the PREQ which this PREP | |
497 | * replies | |
498 | */ | |
499 | dst_addr = PREP_IE_DST_ADDR(prep_elem); | |
f698d856 | 500 | if (memcmp(dst_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) |
050ac52c LCC |
501 | /* destination, no forwarding required */ |
502 | return; | |
503 | ||
504 | ttl = PREP_IE_TTL(prep_elem); | |
505 | if (ttl <= 1) { | |
472dbc45 | 506 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
507 | return; |
508 | } | |
509 | ||
510 | rcu_read_lock(); | |
f698d856 | 511 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
512 | if (mpath) |
513 | spin_lock_bh(&mpath->state_lock); | |
514 | else | |
515 | goto fail; | |
516 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
517 | spin_unlock_bh(&mpath->state_lock); | |
518 | goto fail; | |
519 | } | |
17741cdc | 520 | memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c LCC |
521 | spin_unlock_bh(&mpath->state_lock); |
522 | --ttl; | |
523 | flags = PREP_IE_FLAGS(prep_elem); | |
524 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
525 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
526 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
527 | dst_dsn = PREP_IE_DST_DSN(prep_elem); | |
528 | orig_dsn = PREP_IE_ORIG_DSN(prep_elem); | |
529 | ||
530 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
aa2b5928 | 531 | cpu_to_le32(orig_dsn), 0, dst_addr, |
17741cdc | 532 | cpu_to_le32(dst_dsn), mpath->next_hop->sta.addr, hopcount, ttl, |
aa2b5928 | 533 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 534 | 0, sdata); |
050ac52c | 535 | rcu_read_unlock(); |
472dbc45 | 536 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
537 | return; |
538 | ||
539 | fail: | |
540 | rcu_read_unlock(); | |
472dbc45 | 541 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
542 | return; |
543 | } | |
544 | ||
f698d856 | 545 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
546 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
547 | { | |
548 | struct mesh_path *mpath; | |
549 | u8 *ta, *dst_addr; | |
550 | u32 dst_dsn; | |
551 | ||
552 | ta = mgmt->sa; | |
553 | dst_addr = PERR_IE_DST_ADDR(perr_elem); | |
554 | dst_dsn = PERR_IE_DST_DSN(perr_elem); | |
555 | rcu_read_lock(); | |
f698d856 | 556 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
557 | if (mpath) { |
558 | spin_lock_bh(&mpath->state_lock); | |
559 | if (mpath->flags & MESH_PATH_ACTIVE && | |
17741cdc | 560 | memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 && |
050ac52c LCC |
561 | (!(mpath->flags & MESH_PATH_DSN_VALID) || |
562 | DSN_GT(dst_dsn, mpath->dsn))) { | |
563 | mpath->flags &= ~MESH_PATH_ACTIVE; | |
564 | mpath->dsn = dst_dsn; | |
565 | spin_unlock_bh(&mpath->state_lock); | |
aa2b5928 | 566 | mesh_path_error_tx(dst_addr, cpu_to_le32(dst_dsn), |
f698d856 | 567 | sdata->dev->broadcast, sdata); |
050ac52c LCC |
568 | } else |
569 | spin_unlock_bh(&mpath->state_lock); | |
570 | } | |
571 | rcu_read_unlock(); | |
572 | } | |
573 | ||
574 | ||
575 | ||
f698d856 | 576 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
577 | struct ieee80211_mgmt *mgmt, |
578 | size_t len) | |
579 | { | |
580 | struct ieee802_11_elems elems; | |
581 | size_t baselen; | |
582 | u32 last_hop_metric; | |
583 | ||
9c80d3dc JB |
584 | /* need action_code */ |
585 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
586 | return; | |
587 | ||
050ac52c LCC |
588 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
589 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
590 | len - baselen, &elems); | |
591 | ||
592 | switch (mgmt->u.action.u.mesh_action.action_code) { | |
593 | case MPATH_PREQ: | |
594 | if (!elems.preq || elems.preq_len != 37) | |
595 | /* Right now we support just 1 destination and no AE */ | |
596 | return; | |
f698d856 | 597 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq); |
050ac52c LCC |
598 | if (!last_hop_metric) |
599 | return; | |
f698d856 | 600 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, last_hop_metric); |
050ac52c LCC |
601 | break; |
602 | case MPATH_PREP: | |
603 | if (!elems.prep || elems.prep_len != 31) | |
604 | /* Right now we support no AE */ | |
605 | return; | |
f698d856 | 606 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep); |
050ac52c LCC |
607 | if (!last_hop_metric) |
608 | return; | |
f698d856 | 609 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, last_hop_metric); |
050ac52c LCC |
610 | break; |
611 | case MPATH_PERR: | |
612 | if (!elems.perr || elems.perr_len != 12) | |
613 | /* Right now we support only one destination per PERR */ | |
614 | return; | |
f698d856 | 615 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c LCC |
616 | default: |
617 | return; | |
618 | } | |
619 | ||
620 | } | |
621 | ||
622 | /** | |
623 | * mesh_queue_preq - queue a PREQ to a given destination | |
624 | * | |
625 | * @mpath: mesh path to discover | |
626 | * @flags: special attributes of the PREQ to be sent | |
627 | * | |
628 | * Locking: the function must be called from within a rcu read lock block. | |
629 | * | |
630 | */ | |
631 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
632 | { | |
f698d856 | 633 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 634 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
635 | struct mesh_preq_queue *preq_node; |
636 | ||
637 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_KERNEL); | |
638 | if (!preq_node) { | |
639 | printk(KERN_DEBUG "Mesh HWMP: could not allocate PREQ node\n"); | |
640 | return; | |
641 | } | |
642 | ||
472dbc45 JB |
643 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
644 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { | |
645 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
646 | kfree(preq_node); |
647 | if (printk_ratelimit()) | |
648 | printk(KERN_DEBUG "Mesh HWMP: PREQ node queue full\n"); | |
649 | return; | |
650 | } | |
651 | ||
652 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
653 | preq_node->flags = flags; | |
654 | ||
472dbc45 JB |
655 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
656 | ++ifmsh->preq_queue_len; | |
657 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c | 658 | |
472dbc45 JB |
659 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
660 | queue_work(sdata->local->hw.workqueue, &ifmsh->work); | |
050ac52c | 661 | |
472dbc45 | 662 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
663 | /* avoid long wait if did not send preqs for a long time |
664 | * and jiffies wrapped around | |
665 | */ | |
472dbc45 JB |
666 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
667 | queue_work(sdata->local->hw.workqueue, &ifmsh->work); | |
050ac52c | 668 | } else |
472dbc45 | 669 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
670 | min_preq_int_jiff(sdata)); |
671 | } | |
672 | ||
673 | /** | |
674 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
675 | * | |
f698d856 | 676 | * @sdata: local mesh subif |
050ac52c | 677 | */ |
f698d856 | 678 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 679 | { |
472dbc45 | 680 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
681 | struct mesh_preq_queue *preq_node; |
682 | struct mesh_path *mpath; | |
683 | u8 ttl, dst_flags; | |
684 | u32 lifetime; | |
685 | ||
472dbc45 JB |
686 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
687 | if (!ifmsh->preq_queue_len || | |
688 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 689 | min_preq_int_jiff(sdata))) { |
472dbc45 | 690 | spin_unlock(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
691 | return; |
692 | } | |
693 | ||
472dbc45 | 694 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
695 | struct mesh_preq_queue, list); |
696 | list_del(&preq_node->list); | |
472dbc45 JB |
697 | --ifmsh->preq_queue_len; |
698 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
699 | |
700 | rcu_read_lock(); | |
f698d856 | 701 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
702 | if (!mpath) |
703 | goto enddiscovery; | |
704 | ||
705 | spin_lock_bh(&mpath->state_lock); | |
706 | if (preq_node->flags & PREQ_Q_F_START) { | |
707 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
708 | spin_unlock_bh(&mpath->state_lock); | |
709 | goto enddiscovery; | |
710 | } else { | |
711 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
712 | mpath->flags |= MESH_PATH_RESOLVING; | |
713 | mpath->discovery_retries = 0; | |
714 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
715 | } | |
716 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
717 | mpath->flags & MESH_PATH_RESOLVED) { | |
718 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
719 | spin_unlock_bh(&mpath->state_lock); | |
720 | goto enddiscovery; | |
721 | } | |
722 | ||
472dbc45 | 723 | ifmsh->last_preq = jiffies; |
050ac52c | 724 | |
472dbc45 | 725 | if (time_after(jiffies, ifmsh->last_dsn_update + |
050ac52c | 726 | net_traversal_jiffies(sdata)) || |
472dbc45 JB |
727 | time_before(jiffies, ifmsh->last_dsn_update)) { |
728 | ++ifmsh->dsn; | |
729 | sdata->u.mesh.last_dsn_update = jiffies; | |
050ac52c LCC |
730 | } |
731 | lifetime = default_lifetime(sdata); | |
472dbc45 | 732 | ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
050ac52c | 733 | if (ttl == 0) { |
472dbc45 | 734 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
735 | spin_unlock_bh(&mpath->state_lock); |
736 | goto enddiscovery; | |
737 | } | |
738 | ||
739 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
740 | dst_flags = MP_F_DO; | |
741 | else | |
742 | dst_flags = MP_F_RF; | |
743 | ||
744 | spin_unlock_bh(&mpath->state_lock); | |
f698d856 | 745 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr, |
472dbc45 | 746 | cpu_to_le32(ifmsh->dsn), dst_flags, mpath->dst, |
f698d856 | 747 | cpu_to_le32(mpath->dsn), sdata->dev->broadcast, 0, |
aa2b5928 | 748 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 749 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
750 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
751 | ||
752 | enddiscovery: | |
753 | rcu_read_unlock(); | |
754 | kfree(preq_node); | |
755 | } | |
756 | ||
757 | /** | |
758 | * ieee80211s_lookup_nexthop - put the appropriate next hop on a mesh frame | |
759 | * | |
e32f85f7 | 760 | * @skb: 802.11 frame to be sent |
f698d856 | 761 | * @sdata: network subif the frame will be sent through |
e32f85f7 | 762 | * @fwd_frame: true if this frame was originally from a different host |
050ac52c LCC |
763 | * |
764 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
765 | * found, the function will start a path discovery and queue the frame so it is | |
766 | * sent when the path is resolved. This means the caller must not free the skb | |
767 | * in this case. | |
768 | */ | |
f698d856 JBG |
769 | int mesh_nexthop_lookup(struct sk_buff *skb, |
770 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 771 | { |
050ac52c LCC |
772 | struct sk_buff *skb_to_free = NULL; |
773 | struct mesh_path *mpath; | |
e32f85f7 LCC |
774 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
775 | u8 *dst_addr = hdr->addr3; | |
050ac52c LCC |
776 | int err = 0; |
777 | ||
778 | rcu_read_lock(); | |
f698d856 | 779 | mpath = mesh_path_lookup(dst_addr, sdata); |
050ac52c LCC |
780 | |
781 | if (!mpath) { | |
f698d856 JBG |
782 | mesh_path_add(dst_addr, sdata); |
783 | mpath = mesh_path_lookup(dst_addr, sdata); | |
050ac52c LCC |
784 | if (!mpath) { |
785 | dev_kfree_skb(skb); | |
472dbc45 | 786 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
787 | err = -ENOSPC; |
788 | goto endlookup; | |
789 | } | |
790 | } | |
791 | ||
792 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
793 | if (time_after(jiffies, mpath->exp_time - | |
472dbc45 | 794 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) |
f698d856 JBG |
795 | && !memcmp(sdata->dev->dev_addr, hdr->addr4, |
796 | ETH_ALEN) | |
050ac52c LCC |
797 | && !(mpath->flags & MESH_PATH_RESOLVING) |
798 | && !(mpath->flags & MESH_PATH_FIXED)) { | |
799 | mesh_queue_preq(mpath, | |
800 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
801 | } | |
17741cdc | 802 | memcpy(hdr->addr1, mpath->next_hop->sta.addr, |
050ac52c LCC |
803 | ETH_ALEN); |
804 | } else { | |
805 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { | |
806 | /* Start discovery only if it is not running yet */ | |
807 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
808 | } | |
809 | ||
810 | if (skb_queue_len(&mpath->frame_queue) >= | |
811 | MESH_FRAME_QUEUE_LEN) { | |
812 | skb_to_free = mpath->frame_queue.next; | |
813 | skb_unlink(skb_to_free, &mpath->frame_queue); | |
814 | } | |
815 | ||
816 | skb_queue_tail(&mpath->frame_queue, skb); | |
817 | if (skb_to_free) | |
f698d856 | 818 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
819 | err = -ENOENT; |
820 | } | |
821 | ||
822 | endlookup: | |
823 | rcu_read_unlock(); | |
824 | return err; | |
825 | } | |
826 | ||
827 | void mesh_path_timer(unsigned long data) | |
828 | { | |
829 | struct ieee80211_sub_if_data *sdata; | |
830 | struct mesh_path *mpath; | |
050ac52c LCC |
831 | |
832 | rcu_read_lock(); | |
833 | mpath = (struct mesh_path *) data; | |
834 | mpath = rcu_dereference(mpath); | |
835 | if (!mpath) | |
836 | goto endmpathtimer; | |
837 | spin_lock_bh(&mpath->state_lock); | |
f698d856 | 838 | sdata = mpath->sdata; |
cfa22c71 | 839 | if (mpath->flags & MESH_PATH_RESOLVED || |
050ac52c LCC |
840 | (!(mpath->flags & MESH_PATH_RESOLVING))) |
841 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); | |
842 | else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
843 | ++mpath->discovery_retries; | |
844 | mpath->discovery_timeout *= 2; | |
845 | mesh_queue_preq(mpath, 0); | |
846 | } else { | |
847 | mpath->flags = 0; | |
848 | mpath->exp_time = jiffies; | |
849 | mesh_path_flush_pending(mpath); | |
850 | } | |
851 | ||
852 | spin_unlock_bh(&mpath->state_lock); | |
853 | endmpathtimer: | |
854 | rcu_read_unlock(); | |
050ac52c | 855 | } |