Commit | Line | Data |
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050ac52c LCC |
1 | /* |
2 | * Copyright (c) 2008 open80211s Ltd. | |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include "mesh.h" | |
11 | ||
27db2e42 RP |
12 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
13 | #define mhwmp_dbg(fmt, args...) printk(KERN_DEBUG "Mesh HWMP: " fmt, ##args) | |
14 | #else | |
15 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
16 | #endif | |
17 | ||
050ac52c LCC |
18 | #define TEST_FRAME_LEN 8192 |
19 | #define MAX_METRIC 0xffffffff | |
20 | #define ARITH_SHIFT 8 | |
21 | ||
22 | /* Number of frames buffered per destination for unresolved destinations */ | |
23 | #define MESH_FRAME_QUEUE_LEN 10 | |
24 | #define MAX_PREQ_QUEUE_LEN 64 | |
25 | ||
26 | /* Destination only */ | |
27 | #define MP_F_DO 0x1 | |
28 | /* Reply and forward */ | |
29 | #define MP_F_RF 0x2 | |
d611f062 RP |
30 | /* Unknown Sequence Number */ |
31 | #define MP_F_USN 0x01 | |
32 | /* Reason code Present */ | |
33 | #define MP_F_RCODE 0x02 | |
050ac52c | 34 | |
90a5e169 RP |
35 | static void mesh_queue_preq(struct mesh_path *, u8); |
36 | ||
a00de5d0 LCC |
37 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
38 | { | |
39 | if (ae) | |
40 | offset += 6; | |
ae7245cb | 41 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
42 | } |
43 | ||
d611f062 RP |
44 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
45 | { | |
46 | if (ae) | |
47 | offset += 6; | |
48 | return get_unaligned_le16(preq_elem + offset); | |
49 | } | |
50 | ||
050ac52c | 51 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
52 | #define AE_F (1<<6) |
53 | #define AE_F_SET(x) (*x & AE_F) | |
54 | #define PREQ_IE_FLAGS(x) (*(x)) | |
55 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
56 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
57 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
58 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
d19b3bf6 | 59 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0); |
a00de5d0 LCC |
60 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)); |
61 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)); | |
d19b3bf6 RP |
62 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
63 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
64 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)); | |
a00de5d0 LCC |
65 | |
66 | ||
67 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
68 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
69 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
70 | #define PREP_IE_ORIG_ADDR(x) (x + 3) | |
d19b3bf6 | 71 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 9, 0); |
a00de5d0 LCC |
72 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)); |
73 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)); | |
d19b3bf6 RP |
74 | #define PREP_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
75 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 27, AE_F_SET(x)); | |
a00de5d0 | 76 | |
d611f062 | 77 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
78 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
79 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
80 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0); | |
81 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0); | |
050ac52c | 82 | |
050ac52c | 83 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
84 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
85 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
86 | |
87 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 88 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 89 | #define default_lifetime(s) \ |
472dbc45 | 90 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 91 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
92 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
93 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 94 | #define disc_timeout_jiff(s) \ |
472dbc45 | 95 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
96 | |
97 | enum mpath_frame_type { | |
98 | MPATH_PREQ = 0, | |
99 | MPATH_PREP, | |
90a5e169 RP |
100 | MPATH_PERR, |
101 | MPATH_RANN | |
050ac52c LCC |
102 | }; |
103 | ||
104 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, | |
d19b3bf6 RP |
105 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
106 | __le32 target_sn, u8 *da, u8 hop_count, u8 ttl,__le32 lifetime, | |
107 | __le32 metric, __le32 preq_id, | |
108 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 109 | { |
f698d856 | 110 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
111 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
112 | struct ieee80211_mgmt *mgmt; | |
113 | u8 *pos; | |
114 | int ie_len; | |
115 | ||
116 | if (!skb) | |
117 | return -1; | |
118 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
119 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
120 | * common action part (1) | |
121 | */ | |
122 | mgmt = (struct ieee80211_mgmt *) | |
123 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
124 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
125 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
126 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
127 | |
128 | memcpy(mgmt->da, da, ETH_ALEN); | |
f698d856 | 129 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
90a5e169 RP |
130 | /* BSSID == SA */ |
131 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); | |
050ac52c | 132 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; |
095de013 | 133 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
050ac52c LCC |
134 | |
135 | switch (action) { | |
136 | case MPATH_PREQ: | |
d19b3bf6 | 137 | mhwmp_dbg("sending PREQ to %pM\n", target); |
050ac52c LCC |
138 | ie_len = 37; |
139 | pos = skb_put(skb, 2 + ie_len); | |
140 | *pos++ = WLAN_EID_PREQ; | |
141 | break; | |
142 | case MPATH_PREP: | |
d19b3bf6 | 143 | mhwmp_dbg("sending PREP to %pM\n", target); |
050ac52c LCC |
144 | ie_len = 31; |
145 | pos = skb_put(skb, 2 + ie_len); | |
146 | *pos++ = WLAN_EID_PREP; | |
147 | break; | |
90a5e169 RP |
148 | case MPATH_RANN: |
149 | mhwmp_dbg("sending RANN from %pM\n", orig_addr); | |
150 | ie_len = sizeof(struct ieee80211_rann_ie); | |
151 | pos = skb_put(skb, 2 + ie_len); | |
152 | *pos++ = WLAN_EID_RANN; | |
153 | break; | |
050ac52c | 154 | default: |
812714d7 | 155 | kfree_skb(skb); |
050ac52c LCC |
156 | return -ENOTSUPP; |
157 | break; | |
158 | } | |
159 | *pos++ = ie_len; | |
160 | *pos++ = flags; | |
161 | *pos++ = hop_count; | |
162 | *pos++ = ttl; | |
163 | if (action == MPATH_PREQ) { | |
164 | memcpy(pos, &preq_id, 4); | |
165 | pos += 4; | |
166 | } | |
167 | memcpy(pos, orig_addr, ETH_ALEN); | |
168 | pos += ETH_ALEN; | |
d19b3bf6 | 169 | memcpy(pos, &orig_sn, 4); |
050ac52c | 170 | pos += 4; |
90a5e169 RP |
171 | if (action != MPATH_RANN) { |
172 | memcpy(pos, &lifetime, 4); | |
173 | pos += 4; | |
174 | } | |
050ac52c LCC |
175 | memcpy(pos, &metric, 4); |
176 | pos += 4; | |
177 | if (action == MPATH_PREQ) { | |
178 | /* destination count */ | |
179 | *pos++ = 1; | |
d19b3bf6 | 180 | *pos++ = target_flags; |
050ac52c | 181 | } |
90a5e169 | 182 | if (action != MPATH_RANN) { |
d19b3bf6 | 183 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 184 | pos += ETH_ALEN; |
d19b3bf6 | 185 | memcpy(pos, &target_sn, 4); |
90a5e169 | 186 | } |
050ac52c | 187 | |
1acc97b6 | 188 | ieee80211_tx_skb(sdata, skb, 1); |
050ac52c LCC |
189 | return 0; |
190 | } | |
191 | ||
192 | /** | |
193 | * mesh_send_path error - Sends a PERR mesh management frame | |
194 | * | |
d19b3bf6 RP |
195 | * @target: broken destination |
196 | * @target_sn: SN of the broken destination | |
197 | * @target_rcode: reason code for this PERR | |
050ac52c LCC |
198 | * @ra: node this frame is addressed to |
199 | */ | |
d19b3bf6 RP |
200 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
201 | __le16 target_rcode, u8 *ra, | |
202 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 203 | { |
f698d856 | 204 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
205 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
206 | struct ieee80211_mgmt *mgmt; | |
207 | u8 *pos; | |
208 | int ie_len; | |
209 | ||
210 | if (!skb) | |
211 | return -1; | |
212 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
213 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
214 | * common action part (1) | |
215 | */ | |
216 | mgmt = (struct ieee80211_mgmt *) | |
217 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
218 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
219 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
220 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
221 | |
222 | memcpy(mgmt->da, ra, ETH_ALEN); | |
f698d856 | 223 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); |
050ac52c LCC |
224 | /* BSSID is left zeroed, wildcard value */ |
225 | mgmt->u.action.category = MESH_PATH_SEL_CATEGORY; | |
dbb81c42 | 226 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
d611f062 | 227 | ie_len = 15; |
050ac52c LCC |
228 | pos = skb_put(skb, 2 + ie_len); |
229 | *pos++ = WLAN_EID_PERR; | |
230 | *pos++ = ie_len; | |
d611f062 RP |
231 | /* ttl */ |
232 | *pos++ = MESH_TTL; | |
050ac52c LCC |
233 | /* number of destinations */ |
234 | *pos++ = 1; | |
d611f062 RP |
235 | /* |
236 | * flags bit, bit 1 is unset if we know the sequence number and | |
237 | * bit 2 is set if we have a reason code | |
238 | */ | |
239 | *pos = 0; | |
d19b3bf6 | 240 | if (!target_sn) |
d611f062 | 241 | *pos |= MP_F_USN; |
d19b3bf6 | 242 | if (target_rcode) |
d611f062 RP |
243 | *pos |= MP_F_RCODE; |
244 | pos++; | |
d19b3bf6 | 245 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 246 | pos += ETH_ALEN; |
d19b3bf6 | 247 | memcpy(pos, &target_sn, 4); |
d611f062 | 248 | pos += 4; |
d19b3bf6 | 249 | memcpy(pos, &target_rcode, 2); |
050ac52c | 250 | |
1acc97b6 | 251 | ieee80211_tx_skb(sdata, skb, 1); |
050ac52c LCC |
252 | return 0; |
253 | } | |
254 | ||
bfc32e6a JC |
255 | void ieee80211s_update_metric(struct ieee80211_local *local, |
256 | struct sta_info *stainfo, struct sk_buff *skb) | |
257 | { | |
258 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
259 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
260 | int failed; | |
261 | ||
262 | if (!ieee80211_is_data(hdr->frame_control)) | |
263 | return; | |
264 | ||
265 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
266 | ||
267 | /* moving average, scaled to 100 */ | |
268 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
269 | if (stainfo->fail_avg > 95) | |
270 | mesh_plink_broken(stainfo); | |
271 | } | |
272 | ||
050ac52c LCC |
273 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
274 | struct sta_info *sta) | |
275 | { | |
276 | struct ieee80211_supported_band *sband; | |
277 | /* This should be adjusted for each device */ | |
278 | int device_constant = 1 << ARITH_SHIFT; | |
279 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
280 | int s_unit = 1 << ARITH_SHIFT; | |
281 | int rate, err; | |
282 | u32 tx_time, estimated_retx; | |
283 | u64 result; | |
284 | ||
285 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
286 | ||
287 | if (sta->fail_avg >= 100) | |
288 | return MAX_METRIC; | |
e6a9854b JB |
289 | |
290 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
291 | return MAX_METRIC; | |
292 | ||
050ac52c LCC |
293 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
294 | ||
295 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
296 | * 1Mbps. This will be corrected on tx_time computation. | |
297 | */ | |
e6a9854b | 298 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
299 | tx_time = (device_constant + 10 * test_frame_len / rate); |
300 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
301 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
302 | return (u32)result; | |
303 | } | |
304 | ||
305 | /** | |
306 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
307 | * | |
f698d856 | 308 | * @sdata: local mesh subif |
050ac52c LCC |
309 | * @mgmt: mesh management frame |
310 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
311 | * | |
312 | * This function updates the path routing information to the originator and the | |
f99288d1 | 313 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
314 | * |
315 | * Returns: metric to frame originator or 0 if the frame should not be further | |
316 | * processed | |
317 | * | |
318 | * Notes: this function is the only place (besides user-provided info) where | |
319 | * path routing information is updated. | |
320 | */ | |
f698d856 | 321 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 322 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 323 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 324 | { |
f698d856 | 325 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
326 | struct mesh_path *mpath; |
327 | struct sta_info *sta; | |
328 | bool fresh_info; | |
329 | u8 *orig_addr, *ta; | |
d19b3bf6 | 330 | u32 orig_sn, orig_metric; |
050ac52c LCC |
331 | unsigned long orig_lifetime, exp_time; |
332 | u32 last_hop_metric, new_metric; | |
333 | bool process = true; | |
050ac52c LCC |
334 | |
335 | rcu_read_lock(); | |
336 | sta = sta_info_get(local, mgmt->sa); | |
dc0b0f7d JB |
337 | if (!sta) { |
338 | rcu_read_unlock(); | |
050ac52c | 339 | return 0; |
dc0b0f7d | 340 | } |
050ac52c LCC |
341 | |
342 | last_hop_metric = airtime_link_metric_get(local, sta); | |
343 | /* Update and check originator routing info */ | |
344 | fresh_info = true; | |
345 | ||
346 | switch (action) { | |
347 | case MPATH_PREQ: | |
348 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 349 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
350 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
351 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
352 | break; | |
353 | case MPATH_PREP: | |
354 | /* Originator here refers to the MP that was the destination in | |
355 | * the Path Request. The draft refers to that MP as the | |
356 | * destination address, even though usually it is the origin of | |
357 | * the PREP frame. We divert from the nomenclature in the draft | |
358 | * so that we can easily use a single function to gather path | |
359 | * information from both PREQ and PREP frames. | |
360 | */ | |
361 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 362 | orig_sn = PREP_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
363 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
364 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
365 | break; | |
366 | default: | |
dc0b0f7d | 367 | rcu_read_unlock(); |
050ac52c LCC |
368 | return 0; |
369 | } | |
370 | new_metric = orig_metric + last_hop_metric; | |
371 | if (new_metric < orig_metric) | |
372 | new_metric = MAX_METRIC; | |
373 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
374 | ||
f698d856 | 375 | if (memcmp(orig_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
050ac52c LCC |
376 | /* This MP is the originator, we are not interested in this |
377 | * frame, except for updating transmitter's path info. | |
378 | */ | |
379 | process = false; | |
380 | fresh_info = false; | |
381 | } else { | |
f698d856 | 382 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
383 | if (mpath) { |
384 | spin_lock_bh(&mpath->state_lock); | |
385 | if (mpath->flags & MESH_PATH_FIXED) | |
386 | fresh_info = false; | |
387 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
388 | (mpath->flags & MESH_PATH_SN_VALID)) { |
389 | if (SN_GT(mpath->sn, orig_sn) || | |
390 | (mpath->sn == orig_sn && | |
050ac52c LCC |
391 | action == MPATH_PREQ && |
392 | new_metric > mpath->metric)) { | |
393 | process = false; | |
394 | fresh_info = false; | |
395 | } | |
396 | } | |
397 | } else { | |
f698d856 JBG |
398 | mesh_path_add(orig_addr, sdata); |
399 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
400 | if (!mpath) { |
401 | rcu_read_unlock(); | |
050ac52c LCC |
402 | return 0; |
403 | } | |
404 | spin_lock_bh(&mpath->state_lock); | |
405 | } | |
406 | ||
407 | if (fresh_info) { | |
408 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 409 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 410 | mpath->metric = new_metric; |
d19b3bf6 | 411 | mpath->sn = orig_sn; |
050ac52c LCC |
412 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
413 | ? mpath->exp_time : exp_time; | |
414 | mesh_path_activate(mpath); | |
415 | spin_unlock_bh(&mpath->state_lock); | |
416 | mesh_path_tx_pending(mpath); | |
417 | /* draft says preq_id should be saved to, but there does | |
418 | * not seem to be any use for it, skipping by now | |
419 | */ | |
420 | } else | |
421 | spin_unlock_bh(&mpath->state_lock); | |
422 | } | |
423 | ||
424 | /* Update and check transmitter routing info */ | |
425 | ta = mgmt->sa; | |
426 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
427 | fresh_info = false; | |
428 | else { | |
429 | fresh_info = true; | |
430 | ||
f698d856 | 431 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
432 | if (mpath) { |
433 | spin_lock_bh(&mpath->state_lock); | |
434 | if ((mpath->flags & MESH_PATH_FIXED) || | |
435 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
436 | (last_hop_metric > mpath->metric))) | |
437 | fresh_info = false; | |
438 | } else { | |
f698d856 JBG |
439 | mesh_path_add(ta, sdata); |
440 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
441 | if (!mpath) { |
442 | rcu_read_unlock(); | |
050ac52c LCC |
443 | return 0; |
444 | } | |
445 | spin_lock_bh(&mpath->state_lock); | |
446 | } | |
447 | ||
448 | if (fresh_info) { | |
449 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 450 | mpath->flags &= ~MESH_PATH_SN_VALID; |
050ac52c LCC |
451 | mpath->metric = last_hop_metric; |
452 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
453 | ? mpath->exp_time : exp_time; | |
454 | mesh_path_activate(mpath); | |
455 | spin_unlock_bh(&mpath->state_lock); | |
456 | mesh_path_tx_pending(mpath); | |
457 | } else | |
458 | spin_unlock_bh(&mpath->state_lock); | |
459 | } | |
460 | ||
050ac52c LCC |
461 | rcu_read_unlock(); |
462 | ||
463 | return process ? new_metric : 0; | |
464 | } | |
465 | ||
f698d856 | 466 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 467 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
468 | u8 *preq_elem, u32 metric) |
469 | { | |
472dbc45 | 470 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 471 | struct mesh_path *mpath; |
d19b3bf6 RP |
472 | u8 *target_addr, *orig_addr; |
473 | u8 target_flags, ttl; | |
474 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
475 | bool reply = false; |
476 | bool forward = true; | |
477 | ||
d19b3bf6 RP |
478 | /* Update target SN, if present */ |
479 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 480 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
481 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
482 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
483 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
050ac52c | 484 | |
f3c0d88a | 485 | mhwmp_dbg("received PREQ from %pM\n", orig_addr); |
27db2e42 | 486 | |
d19b3bf6 | 487 | if (memcmp(target_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) { |
dbb81c42 | 488 | mhwmp_dbg("PREQ is for us\n"); |
050ac52c LCC |
489 | forward = false; |
490 | reply = true; | |
491 | metric = 0; | |
d19b3bf6 | 492 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 493 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
494 | time_before(jiffies, ifmsh->last_sn_update)) { |
495 | target_sn = ++ifmsh->sn; | |
496 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
497 | } |
498 | } else { | |
499 | rcu_read_lock(); | |
d19b3bf6 | 500 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 501 | if (mpath) { |
d19b3bf6 RP |
502 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
503 | SN_LT(mpath->sn, target_sn)) { | |
504 | mpath->sn = target_sn; | |
505 | mpath->flags |= MESH_PATH_SN_VALID; | |
506 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
507 | (mpath->flags & MESH_PATH_ACTIVE)) { |
508 | reply = true; | |
509 | metric = mpath->metric; | |
d19b3bf6 RP |
510 | target_sn = mpath->sn; |
511 | if (target_flags & MP_F_RF) | |
512 | target_flags |= MP_F_DO; | |
050ac52c LCC |
513 | else |
514 | forward = false; | |
515 | } | |
516 | } | |
517 | rcu_read_unlock(); | |
518 | } | |
519 | ||
520 | if (reply) { | |
521 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
472dbc45 | 522 | ttl = ifmsh->mshcfg.dot11MeshTTL; |
27db2e42 RP |
523 | if (ttl != 0) { |
524 | mhwmp_dbg("replying to the PREQ\n"); | |
d19b3bf6 RP |
525 | mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr, |
526 | cpu_to_le32(target_sn), 0, orig_addr, | |
527 | cpu_to_le32(orig_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 528 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 529 | 0, sdata); |
27db2e42 | 530 | } else |
472dbc45 | 531 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
532 | } |
533 | ||
534 | if (forward) { | |
535 | u32 preq_id; | |
536 | u8 hopcount, flags; | |
537 | ||
538 | ttl = PREQ_IE_TTL(preq_elem); | |
539 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
540 | if (ttl <= 1) { | |
472dbc45 | 541 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
542 | return; |
543 | } | |
f3c0d88a | 544 | mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr); |
050ac52c LCC |
545 | --ttl; |
546 | flags = PREQ_IE_FLAGS(preq_elem); | |
547 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
548 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
549 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
d19b3bf6 RP |
550 | cpu_to_le32(orig_sn), target_flags, target_addr, |
551 | cpu_to_le32(target_sn), sdata->dev->broadcast, | |
aa2b5928 LCC |
552 | hopcount, ttl, cpu_to_le32(lifetime), |
553 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 554 | sdata); |
c8a61a7d | 555 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 556 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
557 | } |
558 | } | |
559 | ||
560 | ||
f698d856 | 561 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
562 | struct ieee80211_mgmt *mgmt, |
563 | u8 *prep_elem, u32 metric) | |
564 | { | |
050ac52c | 565 | struct mesh_path *mpath; |
d19b3bf6 | 566 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
567 | u8 ttl, hopcount, flags; |
568 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 569 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 570 | |
f3c0d88a | 571 | mhwmp_dbg("received PREP from %pM\n", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 572 | |
050ac52c LCC |
573 | /* Note that we divert from the draft nomenclature and denominate |
574 | * destination to what the draft refers to as origininator. So in this | |
575 | * function destnation refers to the final destination of the PREP, | |
576 | * which corresponds with the originator of the PREQ which this PREP | |
577 | * replies | |
578 | */ | |
d19b3bf6 RP |
579 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
580 | if (memcmp(target_addr, sdata->dev->dev_addr, ETH_ALEN) == 0) | |
050ac52c LCC |
581 | /* destination, no forwarding required */ |
582 | return; | |
583 | ||
584 | ttl = PREP_IE_TTL(prep_elem); | |
585 | if (ttl <= 1) { | |
472dbc45 | 586 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
587 | return; |
588 | } | |
589 | ||
590 | rcu_read_lock(); | |
d19b3bf6 | 591 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
592 | if (mpath) |
593 | spin_lock_bh(&mpath->state_lock); | |
594 | else | |
595 | goto fail; | |
596 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
597 | spin_unlock_bh(&mpath->state_lock); | |
598 | goto fail; | |
599 | } | |
17741cdc | 600 | memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c LCC |
601 | spin_unlock_bh(&mpath->state_lock); |
602 | --ttl; | |
603 | flags = PREP_IE_FLAGS(prep_elem); | |
604 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
605 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
606 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
d19b3bf6 RP |
607 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
608 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
609 | |
610 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 RP |
611 | cpu_to_le32(orig_sn), 0, target_addr, |
612 | cpu_to_le32(target_sn), mpath->next_hop->sta.addr, hopcount, | |
613 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), | |
f698d856 | 614 | 0, sdata); |
050ac52c | 615 | rcu_read_unlock(); |
c8a61a7d DW |
616 | |
617 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 618 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
619 | return; |
620 | ||
621 | fail: | |
622 | rcu_read_unlock(); | |
472dbc45 | 623 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
624 | return; |
625 | } | |
626 | ||
f698d856 | 627 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
628 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
629 | { | |
d611f062 | 630 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 631 | struct mesh_path *mpath; |
d611f062 | 632 | u8 ttl; |
d19b3bf6 RP |
633 | u8 *ta, *target_addr; |
634 | u8 target_flags; | |
635 | u32 target_sn; | |
636 | u16 target_rcode; | |
050ac52c LCC |
637 | |
638 | ta = mgmt->sa; | |
d611f062 RP |
639 | ttl = PERR_IE_TTL(perr_elem); |
640 | if (ttl <= 1) { | |
641 | ifmsh->mshstats.dropped_frames_ttl++; | |
642 | return; | |
643 | } | |
644 | ttl--; | |
d19b3bf6 RP |
645 | target_flags = PERR_IE_TARGET_FLAGS(perr_elem); |
646 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); | |
647 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
648 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 649 | |
050ac52c | 650 | rcu_read_lock(); |
d19b3bf6 | 651 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
652 | if (mpath) { |
653 | spin_lock_bh(&mpath->state_lock); | |
654 | if (mpath->flags & MESH_PATH_ACTIVE && | |
17741cdc | 655 | memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 && |
d19b3bf6 RP |
656 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
657 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 658 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 659 | mpath->sn = target_sn; |
050ac52c | 660 | spin_unlock_bh(&mpath->state_lock); |
d19b3bf6 RP |
661 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
662 | cpu_to_le16(target_rcode), | |
f698d856 | 663 | sdata->dev->broadcast, sdata); |
050ac52c LCC |
664 | } else |
665 | spin_unlock_bh(&mpath->state_lock); | |
666 | } | |
667 | rcu_read_unlock(); | |
668 | } | |
669 | ||
90a5e169 RP |
670 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
671 | struct ieee80211_mgmt *mgmt, | |
672 | struct ieee80211_rann_ie *rann) | |
673 | { | |
674 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
675 | struct mesh_path *mpath; | |
676 | u8 *ta; | |
677 | u8 ttl, flags, hopcount; | |
678 | u8 *orig_addr; | |
d19b3bf6 | 679 | u32 orig_sn, metric; |
90a5e169 RP |
680 | |
681 | ta = mgmt->sa; | |
682 | ttl = rann->rann_ttl; | |
683 | if (ttl <= 1) { | |
684 | ifmsh->mshstats.dropped_frames_ttl++; | |
685 | return; | |
686 | } | |
687 | ttl--; | |
688 | flags = rann->rann_flags; | |
689 | orig_addr = rann->rann_addr; | |
d19b3bf6 | 690 | orig_sn = rann->rann_seq; |
90a5e169 | 691 | hopcount = rann->rann_hopcount; |
a6a58b4f | 692 | hopcount++; |
90a5e169 RP |
693 | metric = rann->rann_metric; |
694 | mhwmp_dbg("received RANN from %pM\n", orig_addr); | |
695 | ||
696 | rcu_read_lock(); | |
697 | mpath = mesh_path_lookup(orig_addr, sdata); | |
698 | if (!mpath) { | |
699 | mesh_path_add(orig_addr, sdata); | |
700 | mpath = mesh_path_lookup(orig_addr, sdata); | |
701 | if (!mpath) { | |
702 | rcu_read_unlock(); | |
703 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
704 | return; | |
705 | } | |
706 | mesh_queue_preq(mpath, | |
707 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
708 | } | |
d19b3bf6 | 709 | if (mpath->sn < orig_sn) { |
90a5e169 | 710 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 711 | cpu_to_le32(orig_sn), |
90a5e169 | 712 | 0, NULL, 0, sdata->dev->broadcast, |
a6a58b4f RP |
713 | hopcount, ttl, 0, |
714 | cpu_to_le32(metric + mpath->metric), | |
90a5e169 | 715 | 0, sdata); |
d19b3bf6 | 716 | mpath->sn = orig_sn; |
90a5e169 RP |
717 | } |
718 | rcu_read_unlock(); | |
719 | } | |
050ac52c LCC |
720 | |
721 | ||
f698d856 | 722 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
723 | struct ieee80211_mgmt *mgmt, |
724 | size_t len) | |
725 | { | |
726 | struct ieee802_11_elems elems; | |
727 | size_t baselen; | |
728 | u32 last_hop_metric; | |
729 | ||
9c80d3dc JB |
730 | /* need action_code */ |
731 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
732 | return; | |
733 | ||
050ac52c LCC |
734 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
735 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
736 | len - baselen, &elems); | |
737 | ||
dbb81c42 RP |
738 | if (elems.preq) { |
739 | if (elems.preq_len != 37) | |
050ac52c LCC |
740 | /* Right now we support just 1 destination and no AE */ |
741 | return; | |
dbb81c42 RP |
742 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
743 | MPATH_PREQ); | |
744 | if (last_hop_metric) | |
745 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
746 | last_hop_metric); | |
747 | } | |
748 | if (elems.prep) { | |
749 | if (elems.prep_len != 31) | |
050ac52c LCC |
750 | /* Right now we support no AE */ |
751 | return; | |
dbb81c42 RP |
752 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
753 | MPATH_PREP); | |
754 | if (last_hop_metric) | |
755 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
756 | last_hop_metric); | |
757 | } | |
758 | if (elems.perr) { | |
d611f062 | 759 | if (elems.perr_len != 15) |
050ac52c LCC |
760 | /* Right now we support only one destination per PERR */ |
761 | return; | |
f698d856 | 762 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 763 | } |
90a5e169 RP |
764 | if (elems.rann) |
765 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
766 | } |
767 | ||
768 | /** | |
769 | * mesh_queue_preq - queue a PREQ to a given destination | |
770 | * | |
771 | * @mpath: mesh path to discover | |
772 | * @flags: special attributes of the PREQ to be sent | |
773 | * | |
774 | * Locking: the function must be called from within a rcu read lock block. | |
775 | * | |
776 | */ | |
777 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
778 | { | |
f698d856 | 779 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 780 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
781 | struct mesh_preq_queue *preq_node; |
782 | ||
59615b5f | 783 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 784 | if (!preq_node) { |
27db2e42 | 785 | mhwmp_dbg("could not allocate PREQ node\n"); |
050ac52c LCC |
786 | return; |
787 | } | |
788 | ||
472dbc45 JB |
789 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
790 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { | |
791 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
792 | kfree(preq_node); |
793 | if (printk_ratelimit()) | |
27db2e42 | 794 | mhwmp_dbg("PREQ node queue full\n"); |
050ac52c LCC |
795 | return; |
796 | } | |
797 | ||
798 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
799 | preq_node->flags = flags; | |
800 | ||
472dbc45 JB |
801 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
802 | ++ifmsh->preq_queue_len; | |
803 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c | 804 | |
472dbc45 | 805 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
c03e20fc | 806 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 807 | |
472dbc45 | 808 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
809 | /* avoid long wait if did not send preqs for a long time |
810 | * and jiffies wrapped around | |
811 | */ | |
472dbc45 | 812 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
c03e20fc | 813 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 814 | } else |
472dbc45 | 815 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
816 | min_preq_int_jiff(sdata)); |
817 | } | |
818 | ||
819 | /** | |
820 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
821 | * | |
f698d856 | 822 | * @sdata: local mesh subif |
050ac52c | 823 | */ |
f698d856 | 824 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 825 | { |
472dbc45 | 826 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
827 | struct mesh_preq_queue *preq_node; |
828 | struct mesh_path *mpath; | |
d19b3bf6 | 829 | u8 ttl, target_flags; |
050ac52c LCC |
830 | u32 lifetime; |
831 | ||
a43816df | 832 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
833 | if (!ifmsh->preq_queue_len || |
834 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 835 | min_preq_int_jiff(sdata))) { |
a43816df | 836 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
837 | return; |
838 | } | |
839 | ||
472dbc45 | 840 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
841 | struct mesh_preq_queue, list); |
842 | list_del(&preq_node->list); | |
472dbc45 | 843 | --ifmsh->preq_queue_len; |
a43816df | 844 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
845 | |
846 | rcu_read_lock(); | |
f698d856 | 847 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
848 | if (!mpath) |
849 | goto enddiscovery; | |
850 | ||
851 | spin_lock_bh(&mpath->state_lock); | |
852 | if (preq_node->flags & PREQ_Q_F_START) { | |
853 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
854 | spin_unlock_bh(&mpath->state_lock); | |
855 | goto enddiscovery; | |
856 | } else { | |
857 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
858 | mpath->flags |= MESH_PATH_RESOLVING; | |
859 | mpath->discovery_retries = 0; | |
860 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
861 | } | |
862 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
863 | mpath->flags & MESH_PATH_RESOLVED) { | |
864 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
865 | spin_unlock_bh(&mpath->state_lock); | |
866 | goto enddiscovery; | |
867 | } | |
868 | ||
472dbc45 | 869 | ifmsh->last_preq = jiffies; |
050ac52c | 870 | |
d19b3bf6 | 871 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 872 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
873 | time_before(jiffies, ifmsh->last_sn_update)) { |
874 | ++ifmsh->sn; | |
875 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
876 | } |
877 | lifetime = default_lifetime(sdata); | |
472dbc45 | 878 | ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
050ac52c | 879 | if (ttl == 0) { |
472dbc45 | 880 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
881 | spin_unlock_bh(&mpath->state_lock); |
882 | goto enddiscovery; | |
883 | } | |
884 | ||
885 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 886 | target_flags = MP_F_DO; |
050ac52c | 887 | else |
d19b3bf6 | 888 | target_flags = MP_F_RF; |
050ac52c LCC |
889 | |
890 | spin_unlock_bh(&mpath->state_lock); | |
f698d856 | 891 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->dev->dev_addr, |
d19b3bf6 RP |
892 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
893 | cpu_to_le32(mpath->sn), sdata->dev->broadcast, 0, | |
aa2b5928 | 894 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 895 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
896 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
897 | ||
898 | enddiscovery: | |
899 | rcu_read_unlock(); | |
900 | kfree(preq_node); | |
901 | } | |
902 | ||
903 | /** | |
2182b830 | 904 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame |
050ac52c | 905 | * |
e32f85f7 | 906 | * @skb: 802.11 frame to be sent |
f698d856 | 907 | * @sdata: network subif the frame will be sent through |
050ac52c LCC |
908 | * |
909 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
910 | * found, the function will start a path discovery and queue the frame so it is | |
911 | * sent when the path is resolved. This means the caller must not free the skb | |
912 | * in this case. | |
913 | */ | |
f698d856 JBG |
914 | int mesh_nexthop_lookup(struct sk_buff *skb, |
915 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 916 | { |
050ac52c LCC |
917 | struct sk_buff *skb_to_free = NULL; |
918 | struct mesh_path *mpath; | |
e32f85f7 | 919 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
d19b3bf6 | 920 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
921 | int err = 0; |
922 | ||
923 | rcu_read_lock(); | |
d19b3bf6 | 924 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
925 | |
926 | if (!mpath) { | |
d19b3bf6 RP |
927 | mesh_path_add(target_addr, sdata); |
928 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 929 | if (!mpath) { |
472dbc45 | 930 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
931 | err = -ENOSPC; |
932 | goto endlookup; | |
933 | } | |
934 | } | |
935 | ||
936 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
a9e3091b | 937 | if (time_after(jiffies, mpath->exp_time + |
472dbc45 | 938 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) |
f698d856 JBG |
939 | && !memcmp(sdata->dev->dev_addr, hdr->addr4, |
940 | ETH_ALEN) | |
050ac52c LCC |
941 | && !(mpath->flags & MESH_PATH_RESOLVING) |
942 | && !(mpath->flags & MESH_PATH_FIXED)) { | |
943 | mesh_queue_preq(mpath, | |
944 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
945 | } | |
17741cdc | 946 | memcpy(hdr->addr1, mpath->next_hop->sta.addr, |
050ac52c LCC |
947 | ETH_ALEN); |
948 | } else { | |
249b405c | 949 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
050ac52c LCC |
950 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { |
951 | /* Start discovery only if it is not running yet */ | |
952 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
953 | } | |
954 | ||
955 | if (skb_queue_len(&mpath->frame_queue) >= | |
fe583434 JC |
956 | MESH_FRAME_QUEUE_LEN) |
957 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
050ac52c | 958 | |
249b405c | 959 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
050ac52c LCC |
960 | skb_queue_tail(&mpath->frame_queue, skb); |
961 | if (skb_to_free) | |
f698d856 | 962 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
963 | err = -ENOENT; |
964 | } | |
965 | ||
966 | endlookup: | |
967 | rcu_read_unlock(); | |
968 | return err; | |
969 | } | |
970 | ||
971 | void mesh_path_timer(unsigned long data) | |
972 | { | |
973 | struct ieee80211_sub_if_data *sdata; | |
974 | struct mesh_path *mpath; | |
050ac52c LCC |
975 | |
976 | rcu_read_lock(); | |
977 | mpath = (struct mesh_path *) data; | |
978 | mpath = rcu_dereference(mpath); | |
979 | if (!mpath) | |
980 | goto endmpathtimer; | |
f698d856 | 981 | sdata = mpath->sdata; |
5bb644a0 JB |
982 | |
983 | if (sdata->local->quiescing) { | |
984 | rcu_read_unlock(); | |
985 | return; | |
986 | } | |
987 | ||
988 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 989 | if (mpath->flags & MESH_PATH_RESOLVED || |
050ac52c LCC |
990 | (!(mpath->flags & MESH_PATH_RESOLVING))) |
991 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); | |
992 | else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
993 | ++mpath->discovery_retries; | |
994 | mpath->discovery_timeout *= 2; | |
995 | mesh_queue_preq(mpath, 0); | |
996 | } else { | |
997 | mpath->flags = 0; | |
998 | mpath->exp_time = jiffies; | |
999 | mesh_path_flush_pending(mpath); | |
1000 | } | |
1001 | ||
1002 | spin_unlock_bh(&mpath->state_lock); | |
1003 | endmpathtimer: | |
1004 | rcu_read_unlock(); | |
050ac52c | 1005 | } |
e304bfd3 RP |
1006 | |
1007 | void | |
1008 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1009 | { | |
1010 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
1011 | ||
1012 | mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->dev->dev_addr, | |
1013 | cpu_to_le32(++ifmsh->sn), | |
1014 | 0, NULL, 0, sdata->dev->broadcast, | |
1015 | 0, MESH_TTL, 0, 0, 0, sdata); | |
1016 | } |