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050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
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 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
050ac52c LCC |
11 | #include "mesh.h" |
12 | ||
27db2e42 RP |
13 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
14 | #define mhwmp_dbg(fmt, args...) printk(KERN_DEBUG "Mesh HWMP: " fmt, ##args) | |
15 | #else | |
16 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
17 | #endif | |
18 | ||
050ac52c LCC |
19 | #define TEST_FRAME_LEN 8192 |
20 | #define MAX_METRIC 0xffffffff | |
21 | #define ARITH_SHIFT 8 | |
22 | ||
23 | /* Number of frames buffered per destination for unresolved destinations */ | |
24 | #define MESH_FRAME_QUEUE_LEN 10 | |
25 | #define MAX_PREQ_QUEUE_LEN 64 | |
26 | ||
27 | /* Destination only */ | |
28 | #define MP_F_DO 0x1 | |
29 | /* Reply and forward */ | |
30 | #define MP_F_RF 0x2 | |
d611f062 RP |
31 | /* Unknown Sequence Number */ |
32 | #define MP_F_USN 0x01 | |
33 | /* Reason code Present */ | |
34 | #define MP_F_RCODE 0x02 | |
050ac52c | 35 | |
90a5e169 RP |
36 | static void mesh_queue_preq(struct mesh_path *, u8); |
37 | ||
a00de5d0 LCC |
38 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
39 | { | |
40 | if (ae) | |
41 | offset += 6; | |
ae7245cb | 42 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
43 | } |
44 | ||
d611f062 RP |
45 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
46 | { | |
47 | if (ae) | |
48 | offset += 6; | |
49 | return get_unaligned_le16(preq_elem + offset); | |
50 | } | |
51 | ||
050ac52c | 52 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
53 | #define AE_F (1<<6) |
54 | #define AE_F_SET(x) (*x & AE_F) | |
55 | #define PREQ_IE_FLAGS(x) (*(x)) | |
56 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
57 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
58 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
59 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
d19b3bf6 | 60 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0); |
a00de5d0 LCC |
61 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)); |
62 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)); | |
d19b3bf6 RP |
63 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
64 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
65 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)); | |
a00de5d0 LCC |
66 | |
67 | ||
68 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
69 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
70 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
71 | #define PREP_IE_ORIG_ADDR(x) (x + 3) | |
d19b3bf6 | 72 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 9, 0); |
a00de5d0 LCC |
73 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)); |
74 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)); | |
d19b3bf6 RP |
75 | #define PREP_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
76 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 27, AE_F_SET(x)); | |
a00de5d0 | 77 | |
d611f062 | 78 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
79 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
80 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
81 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0); | |
82 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0); | |
050ac52c | 83 | |
050ac52c | 84 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
85 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
86 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
87 | |
88 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 89 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 90 | #define default_lifetime(s) \ |
472dbc45 | 91 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 92 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
93 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
94 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 95 | #define disc_timeout_jiff(s) \ |
472dbc45 | 96 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
97 | |
98 | enum mpath_frame_type { | |
99 | MPATH_PREQ = 0, | |
100 | MPATH_PREP, | |
90a5e169 RP |
101 | MPATH_PERR, |
102 | MPATH_RANN | |
050ac52c LCC |
103 | }; |
104 | ||
15ff6365 JB |
105 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
106 | ||
050ac52c | 107 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 108 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
109 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
110 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 111 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 112 | { |
f698d856 | 113 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
114 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
115 | struct ieee80211_mgmt *mgmt; | |
116 | u8 *pos; | |
117 | int ie_len; | |
118 | ||
119 | if (!skb) | |
120 | return -1; | |
121 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
122 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
123 | * common action part (1) | |
124 | */ | |
125 | mgmt = (struct ieee80211_mgmt *) | |
126 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
127 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
128 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
129 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
130 | |
131 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 132 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 133 | /* BSSID == SA */ |
47846c9b | 134 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
97ad9139 | 135 | mgmt->u.action.category = WLAN_CATEGORY_MESH_PATH_SEL; |
095de013 | 136 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
050ac52c LCC |
137 | |
138 | switch (action) { | |
139 | case MPATH_PREQ: | |
d19b3bf6 | 140 | mhwmp_dbg("sending PREQ to %pM\n", target); |
050ac52c LCC |
141 | ie_len = 37; |
142 | pos = skb_put(skb, 2 + ie_len); | |
143 | *pos++ = WLAN_EID_PREQ; | |
144 | break; | |
145 | case MPATH_PREP: | |
d19b3bf6 | 146 | mhwmp_dbg("sending PREP to %pM\n", target); |
050ac52c LCC |
147 | ie_len = 31; |
148 | pos = skb_put(skb, 2 + ie_len); | |
149 | *pos++ = WLAN_EID_PREP; | |
150 | break; | |
90a5e169 RP |
151 | case MPATH_RANN: |
152 | mhwmp_dbg("sending RANN from %pM\n", orig_addr); | |
153 | ie_len = sizeof(struct ieee80211_rann_ie); | |
154 | pos = skb_put(skb, 2 + ie_len); | |
155 | *pos++ = WLAN_EID_RANN; | |
156 | break; | |
050ac52c | 157 | default: |
812714d7 | 158 | kfree_skb(skb); |
050ac52c LCC |
159 | return -ENOTSUPP; |
160 | break; | |
161 | } | |
162 | *pos++ = ie_len; | |
163 | *pos++ = flags; | |
164 | *pos++ = hop_count; | |
165 | *pos++ = ttl; | |
166 | if (action == MPATH_PREQ) { | |
167 | memcpy(pos, &preq_id, 4); | |
168 | pos += 4; | |
169 | } | |
170 | memcpy(pos, orig_addr, ETH_ALEN); | |
171 | pos += ETH_ALEN; | |
d19b3bf6 | 172 | memcpy(pos, &orig_sn, 4); |
050ac52c | 173 | pos += 4; |
90a5e169 RP |
174 | if (action != MPATH_RANN) { |
175 | memcpy(pos, &lifetime, 4); | |
176 | pos += 4; | |
177 | } | |
050ac52c LCC |
178 | memcpy(pos, &metric, 4); |
179 | pos += 4; | |
180 | if (action == MPATH_PREQ) { | |
181 | /* destination count */ | |
182 | *pos++ = 1; | |
d19b3bf6 | 183 | *pos++ = target_flags; |
050ac52c | 184 | } |
90a5e169 | 185 | if (action != MPATH_RANN) { |
d19b3bf6 | 186 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 187 | pos += ETH_ALEN; |
d19b3bf6 | 188 | memcpy(pos, &target_sn, 4); |
90a5e169 | 189 | } |
050ac52c | 190 | |
62ae67be | 191 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
192 | return 0; |
193 | } | |
194 | ||
195 | /** | |
196 | * mesh_send_path error - Sends a PERR mesh management frame | |
197 | * | |
d19b3bf6 RP |
198 | * @target: broken destination |
199 | * @target_sn: SN of the broken destination | |
200 | * @target_rcode: reason code for this PERR | |
050ac52c LCC |
201 | * @ra: node this frame is addressed to |
202 | */ | |
d19b3bf6 | 203 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
204 | __le16 target_rcode, const u8 *ra, |
205 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 206 | { |
f698d856 | 207 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
208 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
209 | struct ieee80211_mgmt *mgmt; | |
210 | u8 *pos; | |
211 | int ie_len; | |
212 | ||
213 | if (!skb) | |
214 | return -1; | |
215 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
216 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
217 | * common action part (1) | |
218 | */ | |
219 | mgmt = (struct ieee80211_mgmt *) | |
220 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
221 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
222 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
223 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
224 | |
225 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 226 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
050ac52c | 227 | /* BSSID is left zeroed, wildcard value */ |
97ad9139 | 228 | mgmt->u.action.category = WLAN_CATEGORY_MESH_PATH_SEL; |
dbb81c42 | 229 | mgmt->u.action.u.mesh_action.action_code = MESH_PATH_SEL_ACTION; |
d611f062 | 230 | ie_len = 15; |
050ac52c LCC |
231 | pos = skb_put(skb, 2 + ie_len); |
232 | *pos++ = WLAN_EID_PERR; | |
233 | *pos++ = ie_len; | |
d611f062 RP |
234 | /* ttl */ |
235 | *pos++ = MESH_TTL; | |
050ac52c LCC |
236 | /* number of destinations */ |
237 | *pos++ = 1; | |
d611f062 RP |
238 | /* |
239 | * flags bit, bit 1 is unset if we know the sequence number and | |
240 | * bit 2 is set if we have a reason code | |
241 | */ | |
242 | *pos = 0; | |
d19b3bf6 | 243 | if (!target_sn) |
d611f062 | 244 | *pos |= MP_F_USN; |
d19b3bf6 | 245 | if (target_rcode) |
d611f062 RP |
246 | *pos |= MP_F_RCODE; |
247 | pos++; | |
d19b3bf6 | 248 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 249 | pos += ETH_ALEN; |
d19b3bf6 | 250 | memcpy(pos, &target_sn, 4); |
d611f062 | 251 | pos += 4; |
d19b3bf6 | 252 | memcpy(pos, &target_rcode, 2); |
050ac52c | 253 | |
62ae67be | 254 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
255 | return 0; |
256 | } | |
257 | ||
bfc32e6a JC |
258 | void ieee80211s_update_metric(struct ieee80211_local *local, |
259 | struct sta_info *stainfo, struct sk_buff *skb) | |
260 | { | |
261 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
262 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
263 | int failed; | |
264 | ||
265 | if (!ieee80211_is_data(hdr->frame_control)) | |
266 | return; | |
267 | ||
268 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
269 | ||
270 | /* moving average, scaled to 100 */ | |
271 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
272 | if (stainfo->fail_avg > 95) | |
273 | mesh_plink_broken(stainfo); | |
274 | } | |
275 | ||
050ac52c LCC |
276 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
277 | struct sta_info *sta) | |
278 | { | |
279 | struct ieee80211_supported_band *sband; | |
280 | /* This should be adjusted for each device */ | |
281 | int device_constant = 1 << ARITH_SHIFT; | |
282 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
283 | int s_unit = 1 << ARITH_SHIFT; | |
284 | int rate, err; | |
285 | u32 tx_time, estimated_retx; | |
286 | u64 result; | |
287 | ||
288 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
289 | ||
290 | if (sta->fail_avg >= 100) | |
291 | return MAX_METRIC; | |
e6a9854b JB |
292 | |
293 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
294 | return MAX_METRIC; | |
295 | ||
050ac52c LCC |
296 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
297 | ||
298 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
299 | * 1Mbps. This will be corrected on tx_time computation. | |
300 | */ | |
e6a9854b | 301 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
302 | tx_time = (device_constant + 10 * test_frame_len / rate); |
303 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
304 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
305 | return (u32)result; | |
306 | } | |
307 | ||
308 | /** | |
309 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
310 | * | |
f698d856 | 311 | * @sdata: local mesh subif |
050ac52c LCC |
312 | * @mgmt: mesh management frame |
313 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
314 | * | |
315 | * This function updates the path routing information to the originator and the | |
f99288d1 | 316 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
317 | * |
318 | * Returns: metric to frame originator or 0 if the frame should not be further | |
319 | * processed | |
320 | * | |
321 | * Notes: this function is the only place (besides user-provided info) where | |
322 | * path routing information is updated. | |
323 | */ | |
f698d856 | 324 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 325 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 326 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 327 | { |
f698d856 | 328 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
329 | struct mesh_path *mpath; |
330 | struct sta_info *sta; | |
331 | bool fresh_info; | |
332 | u8 *orig_addr, *ta; | |
d19b3bf6 | 333 | u32 orig_sn, orig_metric; |
050ac52c LCC |
334 | unsigned long orig_lifetime, exp_time; |
335 | u32 last_hop_metric, new_metric; | |
336 | bool process = true; | |
050ac52c LCC |
337 | |
338 | rcu_read_lock(); | |
abe60632 | 339 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
340 | if (!sta) { |
341 | rcu_read_unlock(); | |
050ac52c | 342 | return 0; |
dc0b0f7d | 343 | } |
050ac52c LCC |
344 | |
345 | last_hop_metric = airtime_link_metric_get(local, sta); | |
346 | /* Update and check originator routing info */ | |
347 | fresh_info = true; | |
348 | ||
349 | switch (action) { | |
350 | case MPATH_PREQ: | |
351 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 352 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
353 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
354 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
355 | break; | |
356 | case MPATH_PREP: | |
357 | /* Originator here refers to the MP that was the destination in | |
358 | * the Path Request. The draft refers to that MP as the | |
359 | * destination address, even though usually it is the origin of | |
360 | * the PREP frame. We divert from the nomenclature in the draft | |
361 | * so that we can easily use a single function to gather path | |
362 | * information from both PREQ and PREP frames. | |
363 | */ | |
364 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 365 | orig_sn = PREP_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
366 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
367 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
368 | break; | |
369 | default: | |
dc0b0f7d | 370 | rcu_read_unlock(); |
050ac52c LCC |
371 | return 0; |
372 | } | |
373 | new_metric = orig_metric + last_hop_metric; | |
374 | if (new_metric < orig_metric) | |
375 | new_metric = MAX_METRIC; | |
376 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
377 | ||
47846c9b | 378 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
050ac52c LCC |
379 | /* This MP is the originator, we are not interested in this |
380 | * frame, except for updating transmitter's path info. | |
381 | */ | |
382 | process = false; | |
383 | fresh_info = false; | |
384 | } else { | |
f698d856 | 385 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
386 | if (mpath) { |
387 | spin_lock_bh(&mpath->state_lock); | |
388 | if (mpath->flags & MESH_PATH_FIXED) | |
389 | fresh_info = false; | |
390 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
391 | (mpath->flags & MESH_PATH_SN_VALID)) { |
392 | if (SN_GT(mpath->sn, orig_sn) || | |
393 | (mpath->sn == orig_sn && | |
050ac52c | 394 | action == MPATH_PREQ && |
533866b1 | 395 | new_metric >= mpath->metric)) { |
050ac52c LCC |
396 | process = false; |
397 | fresh_info = false; | |
398 | } | |
399 | } | |
400 | } else { | |
f698d856 JBG |
401 | mesh_path_add(orig_addr, sdata); |
402 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
403 | if (!mpath) { |
404 | rcu_read_unlock(); | |
050ac52c LCC |
405 | return 0; |
406 | } | |
407 | spin_lock_bh(&mpath->state_lock); | |
408 | } | |
409 | ||
410 | if (fresh_info) { | |
411 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 412 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 413 | mpath->metric = new_metric; |
d19b3bf6 | 414 | mpath->sn = orig_sn; |
050ac52c LCC |
415 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
416 | ? mpath->exp_time : exp_time; | |
417 | mesh_path_activate(mpath); | |
418 | spin_unlock_bh(&mpath->state_lock); | |
419 | mesh_path_tx_pending(mpath); | |
420 | /* draft says preq_id should be saved to, but there does | |
421 | * not seem to be any use for it, skipping by now | |
422 | */ | |
423 | } else | |
424 | spin_unlock_bh(&mpath->state_lock); | |
425 | } | |
426 | ||
427 | /* Update and check transmitter routing info */ | |
428 | ta = mgmt->sa; | |
429 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
430 | fresh_info = false; | |
431 | else { | |
432 | fresh_info = true; | |
433 | ||
f698d856 | 434 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
435 | if (mpath) { |
436 | spin_lock_bh(&mpath->state_lock); | |
437 | if ((mpath->flags & MESH_PATH_FIXED) || | |
438 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
439 | (last_hop_metric > mpath->metric))) | |
440 | fresh_info = false; | |
441 | } else { | |
f698d856 JBG |
442 | mesh_path_add(ta, sdata); |
443 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
444 | if (!mpath) { |
445 | rcu_read_unlock(); | |
050ac52c LCC |
446 | return 0; |
447 | } | |
448 | spin_lock_bh(&mpath->state_lock); | |
449 | } | |
450 | ||
451 | if (fresh_info) { | |
452 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 453 | mpath->flags &= ~MESH_PATH_SN_VALID; |
050ac52c LCC |
454 | mpath->metric = last_hop_metric; |
455 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
456 | ? mpath->exp_time : exp_time; | |
457 | mesh_path_activate(mpath); | |
458 | spin_unlock_bh(&mpath->state_lock); | |
459 | mesh_path_tx_pending(mpath); | |
460 | } else | |
461 | spin_unlock_bh(&mpath->state_lock); | |
462 | } | |
463 | ||
050ac52c LCC |
464 | rcu_read_unlock(); |
465 | ||
466 | return process ? new_metric : 0; | |
467 | } | |
468 | ||
f698d856 | 469 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 470 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
471 | u8 *preq_elem, u32 metric) |
472 | { | |
472dbc45 | 473 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 474 | struct mesh_path *mpath; |
d19b3bf6 RP |
475 | u8 *target_addr, *orig_addr; |
476 | u8 target_flags, ttl; | |
477 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
478 | bool reply = false; |
479 | bool forward = true; | |
480 | ||
d19b3bf6 RP |
481 | /* Update target SN, if present */ |
482 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 483 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
484 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
485 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
486 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
050ac52c | 487 | |
f3c0d88a | 488 | mhwmp_dbg("received PREQ from %pM\n", orig_addr); |
27db2e42 | 489 | |
47846c9b | 490 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
dbb81c42 | 491 | mhwmp_dbg("PREQ is for us\n"); |
050ac52c LCC |
492 | forward = false; |
493 | reply = true; | |
494 | metric = 0; | |
d19b3bf6 | 495 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 496 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
497 | time_before(jiffies, ifmsh->last_sn_update)) { |
498 | target_sn = ++ifmsh->sn; | |
499 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
500 | } |
501 | } else { | |
502 | rcu_read_lock(); | |
d19b3bf6 | 503 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 504 | if (mpath) { |
d19b3bf6 RP |
505 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
506 | SN_LT(mpath->sn, target_sn)) { | |
507 | mpath->sn = target_sn; | |
508 | mpath->flags |= MESH_PATH_SN_VALID; | |
509 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
510 | (mpath->flags & MESH_PATH_ACTIVE)) { |
511 | reply = true; | |
512 | metric = mpath->metric; | |
d19b3bf6 RP |
513 | target_sn = mpath->sn; |
514 | if (target_flags & MP_F_RF) | |
515 | target_flags |= MP_F_DO; | |
050ac52c LCC |
516 | else |
517 | forward = false; | |
518 | } | |
519 | } | |
520 | rcu_read_unlock(); | |
521 | } | |
522 | ||
523 | if (reply) { | |
524 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
472dbc45 | 525 | ttl = ifmsh->mshcfg.dot11MeshTTL; |
27db2e42 RP |
526 | if (ttl != 0) { |
527 | mhwmp_dbg("replying to the PREQ\n"); | |
d19b3bf6 RP |
528 | mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr, |
529 | cpu_to_le32(target_sn), 0, orig_addr, | |
530 | cpu_to_le32(orig_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 531 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 532 | 0, sdata); |
27db2e42 | 533 | } else |
472dbc45 | 534 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
535 | } |
536 | ||
537 | if (forward) { | |
538 | u32 preq_id; | |
539 | u8 hopcount, flags; | |
540 | ||
541 | ttl = PREQ_IE_TTL(preq_elem); | |
542 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
543 | if (ttl <= 1) { | |
472dbc45 | 544 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
545 | return; |
546 | } | |
f3c0d88a | 547 | mhwmp_dbg("forwarding the PREQ from %pM\n", orig_addr); |
050ac52c LCC |
548 | --ttl; |
549 | flags = PREQ_IE_FLAGS(preq_elem); | |
550 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
551 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
552 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
d19b3bf6 | 553 | cpu_to_le32(orig_sn), target_flags, target_addr, |
15ff6365 | 554 | cpu_to_le32(target_sn), broadcast_addr, |
aa2b5928 LCC |
555 | hopcount, ttl, cpu_to_le32(lifetime), |
556 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 557 | sdata); |
c8a61a7d | 558 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 559 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
560 | } |
561 | } | |
562 | ||
563 | ||
f698d856 | 564 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
565 | struct ieee80211_mgmt *mgmt, |
566 | u8 *prep_elem, u32 metric) | |
567 | { | |
050ac52c | 568 | struct mesh_path *mpath; |
d19b3bf6 | 569 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
570 | u8 ttl, hopcount, flags; |
571 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 572 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 573 | |
f3c0d88a | 574 | mhwmp_dbg("received PREP from %pM\n", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 575 | |
050ac52c LCC |
576 | /* Note that we divert from the draft nomenclature and denominate |
577 | * destination to what the draft refers to as origininator. So in this | |
578 | * function destnation refers to the final destination of the PREP, | |
579 | * which corresponds with the originator of the PREQ which this PREP | |
580 | * replies | |
581 | */ | |
d19b3bf6 | 582 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
47846c9b | 583 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) |
050ac52c LCC |
584 | /* destination, no forwarding required */ |
585 | return; | |
586 | ||
587 | ttl = PREP_IE_TTL(prep_elem); | |
588 | if (ttl <= 1) { | |
472dbc45 | 589 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
590 | return; |
591 | } | |
592 | ||
593 | rcu_read_lock(); | |
d19b3bf6 | 594 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
595 | if (mpath) |
596 | spin_lock_bh(&mpath->state_lock); | |
597 | else | |
598 | goto fail; | |
599 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
600 | spin_unlock_bh(&mpath->state_lock); | |
601 | goto fail; | |
602 | } | |
17741cdc | 603 | memcpy(next_hop, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c LCC |
604 | spin_unlock_bh(&mpath->state_lock); |
605 | --ttl; | |
606 | flags = PREP_IE_FLAGS(prep_elem); | |
607 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
608 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
609 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
d19b3bf6 RP |
610 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
611 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
612 | |
613 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 614 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 615 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 616 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 617 | 0, sdata); |
050ac52c | 618 | rcu_read_unlock(); |
c8a61a7d DW |
619 | |
620 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 621 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
622 | return; |
623 | ||
624 | fail: | |
625 | rcu_read_unlock(); | |
472dbc45 | 626 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
627 | } |
628 | ||
f698d856 | 629 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
630 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
631 | { | |
d611f062 | 632 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 633 | struct mesh_path *mpath; |
d611f062 | 634 | u8 ttl; |
d19b3bf6 RP |
635 | u8 *ta, *target_addr; |
636 | u8 target_flags; | |
637 | u32 target_sn; | |
638 | u16 target_rcode; | |
050ac52c LCC |
639 | |
640 | ta = mgmt->sa; | |
d611f062 RP |
641 | ttl = PERR_IE_TTL(perr_elem); |
642 | if (ttl <= 1) { | |
643 | ifmsh->mshstats.dropped_frames_ttl++; | |
644 | return; | |
645 | } | |
646 | ttl--; | |
d19b3bf6 RP |
647 | target_flags = PERR_IE_TARGET_FLAGS(perr_elem); |
648 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); | |
649 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
650 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 651 | |
050ac52c | 652 | rcu_read_lock(); |
d19b3bf6 | 653 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
654 | if (mpath) { |
655 | spin_lock_bh(&mpath->state_lock); | |
656 | if (mpath->flags & MESH_PATH_ACTIVE && | |
17741cdc | 657 | memcmp(ta, mpath->next_hop->sta.addr, ETH_ALEN) == 0 && |
d19b3bf6 RP |
658 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
659 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 660 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 661 | mpath->sn = target_sn; |
050ac52c | 662 | spin_unlock_bh(&mpath->state_lock); |
d19b3bf6 RP |
663 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
664 | cpu_to_le16(target_rcode), | |
15ff6365 | 665 | broadcast_addr, sdata); |
050ac52c LCC |
666 | } else |
667 | spin_unlock_bh(&mpath->state_lock); | |
668 | } | |
669 | rcu_read_unlock(); | |
670 | } | |
671 | ||
90a5e169 RP |
672 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
673 | struct ieee80211_mgmt *mgmt, | |
674 | struct ieee80211_rann_ie *rann) | |
675 | { | |
676 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
677 | struct mesh_path *mpath; | |
678 | u8 *ta; | |
679 | u8 ttl, flags, hopcount; | |
680 | u8 *orig_addr; | |
d19b3bf6 | 681 | u32 orig_sn, metric; |
90a5e169 RP |
682 | |
683 | ta = mgmt->sa; | |
684 | ttl = rann->rann_ttl; | |
685 | if (ttl <= 1) { | |
686 | ifmsh->mshstats.dropped_frames_ttl++; | |
687 | return; | |
688 | } | |
689 | ttl--; | |
690 | flags = rann->rann_flags; | |
691 | orig_addr = rann->rann_addr; | |
d19b3bf6 | 692 | orig_sn = rann->rann_seq; |
90a5e169 | 693 | hopcount = rann->rann_hopcount; |
a6a58b4f | 694 | hopcount++; |
90a5e169 RP |
695 | metric = rann->rann_metric; |
696 | mhwmp_dbg("received RANN from %pM\n", orig_addr); | |
697 | ||
698 | rcu_read_lock(); | |
699 | mpath = mesh_path_lookup(orig_addr, sdata); | |
700 | if (!mpath) { | |
701 | mesh_path_add(orig_addr, sdata); | |
702 | mpath = mesh_path_lookup(orig_addr, sdata); | |
703 | if (!mpath) { | |
704 | rcu_read_unlock(); | |
705 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
706 | return; | |
707 | } | |
708 | mesh_queue_preq(mpath, | |
709 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
710 | } | |
d19b3bf6 | 711 | if (mpath->sn < orig_sn) { |
90a5e169 | 712 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 713 | cpu_to_le32(orig_sn), |
15ff6365 | 714 | 0, NULL, 0, broadcast_addr, |
a6a58b4f RP |
715 | hopcount, ttl, 0, |
716 | cpu_to_le32(metric + mpath->metric), | |
90a5e169 | 717 | 0, sdata); |
d19b3bf6 | 718 | mpath->sn = orig_sn; |
90a5e169 RP |
719 | } |
720 | rcu_read_unlock(); | |
721 | } | |
050ac52c LCC |
722 | |
723 | ||
f698d856 | 724 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
725 | struct ieee80211_mgmt *mgmt, |
726 | size_t len) | |
727 | { | |
728 | struct ieee802_11_elems elems; | |
729 | size_t baselen; | |
730 | u32 last_hop_metric; | |
731 | ||
9c80d3dc JB |
732 | /* need action_code */ |
733 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
734 | return; | |
735 | ||
050ac52c LCC |
736 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
737 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
738 | len - baselen, &elems); | |
739 | ||
dbb81c42 RP |
740 | if (elems.preq) { |
741 | if (elems.preq_len != 37) | |
050ac52c LCC |
742 | /* Right now we support just 1 destination and no AE */ |
743 | return; | |
dbb81c42 RP |
744 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
745 | MPATH_PREQ); | |
746 | if (last_hop_metric) | |
747 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
748 | last_hop_metric); | |
749 | } | |
750 | if (elems.prep) { | |
751 | if (elems.prep_len != 31) | |
050ac52c LCC |
752 | /* Right now we support no AE */ |
753 | return; | |
dbb81c42 RP |
754 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
755 | MPATH_PREP); | |
756 | if (last_hop_metric) | |
757 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
758 | last_hop_metric); | |
759 | } | |
760 | if (elems.perr) { | |
d611f062 | 761 | if (elems.perr_len != 15) |
050ac52c LCC |
762 | /* Right now we support only one destination per PERR */ |
763 | return; | |
f698d856 | 764 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 765 | } |
90a5e169 RP |
766 | if (elems.rann) |
767 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
768 | } |
769 | ||
770 | /** | |
771 | * mesh_queue_preq - queue a PREQ to a given destination | |
772 | * | |
773 | * @mpath: mesh path to discover | |
774 | * @flags: special attributes of the PREQ to be sent | |
775 | * | |
776 | * Locking: the function must be called from within a rcu read lock block. | |
777 | * | |
778 | */ | |
779 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
780 | { | |
f698d856 | 781 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 782 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
783 | struct mesh_preq_queue *preq_node; |
784 | ||
59615b5f | 785 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 786 | if (!preq_node) { |
27db2e42 | 787 | mhwmp_dbg("could not allocate PREQ node\n"); |
050ac52c LCC |
788 | return; |
789 | } | |
790 | ||
472dbc45 JB |
791 | spin_lock(&ifmsh->mesh_preq_queue_lock); |
792 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { | |
793 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c LCC |
794 | kfree(preq_node); |
795 | if (printk_ratelimit()) | |
27db2e42 | 796 | mhwmp_dbg("PREQ node queue full\n"); |
050ac52c LCC |
797 | return; |
798 | } | |
799 | ||
800 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
801 | preq_node->flags = flags; | |
802 | ||
472dbc45 JB |
803 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
804 | ++ifmsh->preq_queue_len; | |
805 | spin_unlock(&ifmsh->mesh_preq_queue_lock); | |
050ac52c | 806 | |
472dbc45 | 807 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
c03e20fc | 808 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 809 | |
472dbc45 | 810 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
811 | /* avoid long wait if did not send preqs for a long time |
812 | * and jiffies wrapped around | |
813 | */ | |
472dbc45 | 814 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
c03e20fc | 815 | ieee80211_queue_work(&sdata->local->hw, &ifmsh->work); |
050ac52c | 816 | } else |
472dbc45 | 817 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
818 | min_preq_int_jiff(sdata)); |
819 | } | |
820 | ||
821 | /** | |
822 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
823 | * | |
f698d856 | 824 | * @sdata: local mesh subif |
050ac52c | 825 | */ |
f698d856 | 826 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 827 | { |
472dbc45 | 828 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
829 | struct mesh_preq_queue *preq_node; |
830 | struct mesh_path *mpath; | |
d19b3bf6 | 831 | u8 ttl, target_flags; |
050ac52c LCC |
832 | u32 lifetime; |
833 | ||
a43816df | 834 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
835 | if (!ifmsh->preq_queue_len || |
836 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 837 | min_preq_int_jiff(sdata))) { |
a43816df | 838 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
839 | return; |
840 | } | |
841 | ||
472dbc45 | 842 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
843 | struct mesh_preq_queue, list); |
844 | list_del(&preq_node->list); | |
472dbc45 | 845 | --ifmsh->preq_queue_len; |
a43816df | 846 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
847 | |
848 | rcu_read_lock(); | |
f698d856 | 849 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
850 | if (!mpath) |
851 | goto enddiscovery; | |
852 | ||
853 | spin_lock_bh(&mpath->state_lock); | |
854 | if (preq_node->flags & PREQ_Q_F_START) { | |
855 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
856 | spin_unlock_bh(&mpath->state_lock); | |
857 | goto enddiscovery; | |
858 | } else { | |
859 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
860 | mpath->flags |= MESH_PATH_RESOLVING; | |
861 | mpath->discovery_retries = 0; | |
862 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
863 | } | |
864 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
865 | mpath->flags & MESH_PATH_RESOLVED) { | |
866 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
867 | spin_unlock_bh(&mpath->state_lock); | |
868 | goto enddiscovery; | |
869 | } | |
870 | ||
472dbc45 | 871 | ifmsh->last_preq = jiffies; |
050ac52c | 872 | |
d19b3bf6 | 873 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 874 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
875 | time_before(jiffies, ifmsh->last_sn_update)) { |
876 | ++ifmsh->sn; | |
877 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
878 | } |
879 | lifetime = default_lifetime(sdata); | |
472dbc45 | 880 | ttl = sdata->u.mesh.mshcfg.dot11MeshTTL; |
050ac52c | 881 | if (ttl == 0) { |
472dbc45 | 882 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
883 | spin_unlock_bh(&mpath->state_lock); |
884 | goto enddiscovery; | |
885 | } | |
886 | ||
887 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 888 | target_flags = MP_F_DO; |
050ac52c | 889 | else |
d19b3bf6 | 890 | target_flags = MP_F_RF; |
050ac52c LCC |
891 | |
892 | spin_unlock_bh(&mpath->state_lock); | |
47846c9b | 893 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 894 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
15ff6365 | 895 | cpu_to_le32(mpath->sn), broadcast_addr, 0, |
aa2b5928 | 896 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 897 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
898 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
899 | ||
900 | enddiscovery: | |
901 | rcu_read_unlock(); | |
902 | kfree(preq_node); | |
903 | } | |
904 | ||
905 | /** | |
2182b830 | 906 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame |
050ac52c | 907 | * |
e32f85f7 | 908 | * @skb: 802.11 frame to be sent |
f698d856 | 909 | * @sdata: network subif the frame will be sent through |
050ac52c LCC |
910 | * |
911 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
912 | * found, the function will start a path discovery and queue the frame so it is | |
913 | * sent when the path is resolved. This means the caller must not free the skb | |
914 | * in this case. | |
915 | */ | |
f698d856 JBG |
916 | int mesh_nexthop_lookup(struct sk_buff *skb, |
917 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 918 | { |
050ac52c LCC |
919 | struct sk_buff *skb_to_free = NULL; |
920 | struct mesh_path *mpath; | |
e32f85f7 | 921 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
d19b3bf6 | 922 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
923 | int err = 0; |
924 | ||
925 | rcu_read_lock(); | |
d19b3bf6 | 926 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
927 | |
928 | if (!mpath) { | |
d19b3bf6 RP |
929 | mesh_path_add(target_addr, sdata); |
930 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 931 | if (!mpath) { |
472dbc45 | 932 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
933 | err = -ENOSPC; |
934 | goto endlookup; | |
935 | } | |
936 | } | |
937 | ||
938 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
f64f9e71 | 939 | if (time_after(jiffies, |
7b324d28 | 940 | mpath->exp_time - |
f64f9e71 | 941 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && |
47846c9b | 942 | !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) && |
f64f9e71 JP |
943 | !(mpath->flags & MESH_PATH_RESOLVING) && |
944 | !(mpath->flags & MESH_PATH_FIXED)) { | |
050ac52c LCC |
945 | mesh_queue_preq(mpath, |
946 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
947 | } | |
f64f9e71 | 948 | memcpy(hdr->addr1, mpath->next_hop->sta.addr, ETH_ALEN); |
050ac52c | 949 | } else { |
249b405c | 950 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
050ac52c LCC |
951 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { |
952 | /* Start discovery only if it is not running yet */ | |
953 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
954 | } | |
955 | ||
956 | if (skb_queue_len(&mpath->frame_queue) >= | |
fe583434 JC |
957 | MESH_FRAME_QUEUE_LEN) |
958 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
050ac52c | 959 | |
249b405c | 960 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
050ac52c LCC |
961 | skb_queue_tail(&mpath->frame_queue, skb); |
962 | if (skb_to_free) | |
f698d856 | 963 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
964 | err = -ENOENT; |
965 | } | |
966 | ||
967 | endlookup: | |
968 | rcu_read_unlock(); | |
969 | return err; | |
970 | } | |
971 | ||
972 | void mesh_path_timer(unsigned long data) | |
973 | { | |
974 | struct ieee80211_sub_if_data *sdata; | |
975 | struct mesh_path *mpath; | |
050ac52c LCC |
976 | |
977 | rcu_read_lock(); | |
978 | mpath = (struct mesh_path *) data; | |
979 | mpath = rcu_dereference(mpath); | |
980 | if (!mpath) | |
981 | goto endmpathtimer; | |
f698d856 | 982 | sdata = mpath->sdata; |
5bb644a0 JB |
983 | |
984 | if (sdata->local->quiescing) { | |
985 | rcu_read_unlock(); | |
986 | return; | |
987 | } | |
988 | ||
989 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 990 | if (mpath->flags & MESH_PATH_RESOLVED || |
050ac52c LCC |
991 | (!(mpath->flags & MESH_PATH_RESOLVING))) |
992 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); | |
993 | else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
994 | ++mpath->discovery_retries; | |
995 | mpath->discovery_timeout *= 2; | |
996 | mesh_queue_preq(mpath, 0); | |
997 | } else { | |
998 | mpath->flags = 0; | |
999 | mpath->exp_time = jiffies; | |
1000 | mesh_path_flush_pending(mpath); | |
1001 | } | |
1002 | ||
1003 | spin_unlock_bh(&mpath->state_lock); | |
1004 | endmpathtimer: | |
1005 | rcu_read_unlock(); | |
050ac52c | 1006 | } |
e304bfd3 RP |
1007 | |
1008 | void | |
1009 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1010 | { | |
1011 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
1012 | ||
47846c9b | 1013 | mesh_path_sel_frame_tx(MPATH_RANN, 0, sdata->vif.addr, |
e304bfd3 | 1014 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1015 | 0, NULL, 0, broadcast_addr, |
e304bfd3 RP |
1016 | 0, MESH_TTL, 0, 0, 0, sdata); |
1017 | } |