Commit | Line | Data |
---|---|---|
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> |
2cca397f | 11 | #include "wme.h" |
050ac52c LCC |
12 | #include "mesh.h" |
13 | ||
27db2e42 | 14 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
7646887a JC |
15 | #define mhwmp_dbg(fmt, args...) \ |
16 | printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args) | |
27db2e42 RP |
17 | #else |
18 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
19 | #endif | |
20 | ||
050ac52c LCC |
21 | #define TEST_FRAME_LEN 8192 |
22 | #define MAX_METRIC 0xffffffff | |
23 | #define ARITH_SHIFT 8 | |
24 | ||
25 | /* Number of frames buffered per destination for unresolved destinations */ | |
26 | #define MESH_FRAME_QUEUE_LEN 10 | |
27 | #define MAX_PREQ_QUEUE_LEN 64 | |
28 | ||
29 | /* Destination only */ | |
30 | #define MP_F_DO 0x1 | |
31 | /* Reply and forward */ | |
32 | #define MP_F_RF 0x2 | |
d611f062 RP |
33 | /* Unknown Sequence Number */ |
34 | #define MP_F_USN 0x01 | |
35 | /* Reason code Present */ | |
36 | #define MP_F_RCODE 0x02 | |
050ac52c | 37 | |
90a5e169 RP |
38 | static void mesh_queue_preq(struct mesh_path *, u8); |
39 | ||
a00de5d0 LCC |
40 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
41 | { | |
42 | if (ae) | |
43 | offset += 6; | |
ae7245cb | 44 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
45 | } |
46 | ||
d611f062 RP |
47 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
48 | { | |
49 | if (ae) | |
50 | offset += 6; | |
51 | return get_unaligned_le16(preq_elem + offset); | |
52 | } | |
53 | ||
050ac52c | 54 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
55 | #define AE_F (1<<6) |
56 | #define AE_F_SET(x) (*x & AE_F) | |
57 | #define PREQ_IE_FLAGS(x) (*(x)) | |
58 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
59 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
60 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
61 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
62 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
63 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
64 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
65 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
66 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 67 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
68 | |
69 | ||
70 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
71 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
72 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
73 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
74 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
75 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
76 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
77 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
78 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 79 | |
d611f062 | 80 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
81 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
82 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
83 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
84 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 85 | |
050ac52c | 86 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
87 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
88 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
89 | |
90 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 91 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 92 | #define default_lifetime(s) \ |
472dbc45 | 93 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 94 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
95 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
96 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 97 | #define disc_timeout_jiff(s) \ |
472dbc45 | 98 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
99 | |
100 | enum mpath_frame_type { | |
101 | MPATH_PREQ = 0, | |
102 | MPATH_PREP, | |
90a5e169 RP |
103 | MPATH_PERR, |
104 | MPATH_RANN | |
050ac52c LCC |
105 | }; |
106 | ||
15ff6365 JB |
107 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
108 | ||
050ac52c | 109 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 110 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
111 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
112 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 113 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 114 | { |
f698d856 | 115 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
116 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
117 | struct ieee80211_mgmt *mgmt; | |
118 | u8 *pos; | |
119 | int ie_len; | |
120 | ||
121 | if (!skb) | |
122 | return -1; | |
123 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
124 | /* 25 is the size of the common mgmt part (24) plus the size of the | |
125 | * common action part (1) | |
126 | */ | |
127 | mgmt = (struct ieee80211_mgmt *) | |
128 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
129 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
130 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
131 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
132 | |
133 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 134 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 135 | /* BSSID == SA */ |
47846c9b | 136 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
137 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
138 | mgmt->u.action.u.mesh_action.action_code = | |
139 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
140 | |
141 | switch (action) { | |
142 | case MPATH_PREQ: | |
7646887a | 143 | mhwmp_dbg("sending PREQ to %pM", target); |
050ac52c LCC |
144 | ie_len = 37; |
145 | pos = skb_put(skb, 2 + ie_len); | |
146 | *pos++ = WLAN_EID_PREQ; | |
147 | break; | |
148 | case MPATH_PREP: | |
7646887a | 149 | mhwmp_dbg("sending PREP to %pM", target); |
050ac52c LCC |
150 | ie_len = 31; |
151 | pos = skb_put(skb, 2 + ie_len); | |
152 | *pos++ = WLAN_EID_PREP; | |
153 | break; | |
90a5e169 | 154 | case MPATH_RANN: |
7646887a | 155 | mhwmp_dbg("sending RANN from %pM", orig_addr); |
90a5e169 RP |
156 | ie_len = sizeof(struct ieee80211_rann_ie); |
157 | pos = skb_put(skb, 2 + ie_len); | |
158 | *pos++ = WLAN_EID_RANN; | |
159 | break; | |
050ac52c | 160 | default: |
812714d7 | 161 | kfree_skb(skb); |
050ac52c LCC |
162 | return -ENOTSUPP; |
163 | break; | |
164 | } | |
165 | *pos++ = ie_len; | |
166 | *pos++ = flags; | |
167 | *pos++ = hop_count; | |
168 | *pos++ = ttl; | |
25d49e4d TP |
169 | if (action == MPATH_PREP) { |
170 | memcpy(pos, target, ETH_ALEN); | |
171 | pos += ETH_ALEN; | |
172 | memcpy(pos, &target_sn, 4); | |
050ac52c | 173 | pos += 4; |
25d49e4d TP |
174 | } else { |
175 | if (action == MPATH_PREQ) { | |
176 | memcpy(pos, &preq_id, 4); | |
177 | pos += 4; | |
178 | } | |
179 | memcpy(pos, orig_addr, ETH_ALEN); | |
180 | pos += ETH_ALEN; | |
181 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
182 | pos += 4; |
183 | } | |
25d49e4d TP |
184 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
185 | pos += 4; | |
050ac52c LCC |
186 | memcpy(pos, &metric, 4); |
187 | pos += 4; | |
188 | if (action == MPATH_PREQ) { | |
25d49e4d | 189 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 190 | *pos++ = target_flags; |
d19b3bf6 | 191 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 192 | pos += ETH_ALEN; |
d19b3bf6 | 193 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
194 | pos += 4; |
195 | } else if (action == MPATH_PREP) { | |
196 | memcpy(pos, orig_addr, ETH_ALEN); | |
197 | pos += ETH_ALEN; | |
198 | memcpy(pos, &orig_sn, 4); | |
199 | pos += 4; | |
90a5e169 | 200 | } |
050ac52c | 201 | |
62ae67be | 202 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
203 | return 0; |
204 | } | |
205 | ||
2cca397f JC |
206 | |
207 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
208 | * headroom in case the frame is encrypted. */ | |
209 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
210 | struct sk_buff *skb) | |
211 | { | |
2cca397f JC |
212 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
213 | ||
214 | skb_set_mac_header(skb, 0); | |
215 | skb_set_network_header(skb, 0); | |
216 | skb_set_transport_header(skb, 0); | |
217 | ||
218 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
219 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
220 | skb->priority = 7; | |
221 | ||
222 | info->control.vif = &sdata->vif; | |
2154c81c | 223 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
224 | } |
225 | ||
050ac52c LCC |
226 | /** |
227 | * mesh_send_path error - Sends a PERR mesh management frame | |
228 | * | |
d19b3bf6 RP |
229 | * @target: broken destination |
230 | * @target_sn: SN of the broken destination | |
231 | * @target_rcode: reason code for this PERR | |
050ac52c | 232 | * @ra: node this frame is addressed to |
2cca397f JC |
233 | * |
234 | * Note: This function may be called with driver locks taken that the driver | |
235 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
236 | * frame directly but add it to the pending queue instead. | |
050ac52c | 237 | */ |
d19b3bf6 | 238 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
239 | __le16 target_rcode, const u8 *ra, |
240 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 241 | { |
f698d856 | 242 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
243 | struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400); |
244 | struct ieee80211_mgmt *mgmt; | |
245 | u8 *pos; | |
246 | int ie_len; | |
247 | ||
248 | if (!skb) | |
249 | return -1; | |
2cca397f | 250 | skb_reserve(skb, local->tx_headroom + local->hw.extra_tx_headroom); |
050ac52c LCC |
251 | /* 25 is the size of the common mgmt part (24) plus the size of the |
252 | * common action part (1) | |
253 | */ | |
254 | mgmt = (struct ieee80211_mgmt *) | |
255 | skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
256 | memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action)); | |
e7827a70 HH |
257 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
258 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
259 | |
260 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 261 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
262 | /* BSSID == SA */ |
263 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
264 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
265 | mgmt->u.action.u.mesh_action.action_code = | |
266 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 267 | ie_len = 15; |
050ac52c LCC |
268 | pos = skb_put(skb, 2 + ie_len); |
269 | *pos++ = WLAN_EID_PERR; | |
270 | *pos++ = ie_len; | |
d611f062 | 271 | /* ttl */ |
45904f21 | 272 | *pos++ = ttl; |
050ac52c LCC |
273 | /* number of destinations */ |
274 | *pos++ = 1; | |
d611f062 RP |
275 | /* |
276 | * flags bit, bit 1 is unset if we know the sequence number and | |
277 | * bit 2 is set if we have a reason code | |
278 | */ | |
279 | *pos = 0; | |
d19b3bf6 | 280 | if (!target_sn) |
d611f062 | 281 | *pos |= MP_F_USN; |
d19b3bf6 | 282 | if (target_rcode) |
d611f062 RP |
283 | *pos |= MP_F_RCODE; |
284 | pos++; | |
d19b3bf6 | 285 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 286 | pos += ETH_ALEN; |
d19b3bf6 | 287 | memcpy(pos, &target_sn, 4); |
d611f062 | 288 | pos += 4; |
d19b3bf6 | 289 | memcpy(pos, &target_rcode, 2); |
050ac52c | 290 | |
2cca397f JC |
291 | /* see note in function header */ |
292 | prepare_frame_for_deferred_tx(sdata, skb); | |
293 | ieee80211_add_pending_skb(local, skb); | |
050ac52c LCC |
294 | return 0; |
295 | } | |
296 | ||
bfc32e6a JC |
297 | void ieee80211s_update_metric(struct ieee80211_local *local, |
298 | struct sta_info *stainfo, struct sk_buff *skb) | |
299 | { | |
300 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
301 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
302 | int failed; | |
303 | ||
304 | if (!ieee80211_is_data(hdr->frame_control)) | |
305 | return; | |
306 | ||
307 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
308 | ||
309 | /* moving average, scaled to 100 */ | |
310 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
311 | if (stainfo->fail_avg > 95) | |
312 | mesh_plink_broken(stainfo); | |
313 | } | |
314 | ||
050ac52c LCC |
315 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
316 | struct sta_info *sta) | |
317 | { | |
318 | struct ieee80211_supported_band *sband; | |
319 | /* This should be adjusted for each device */ | |
320 | int device_constant = 1 << ARITH_SHIFT; | |
321 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
322 | int s_unit = 1 << ARITH_SHIFT; | |
323 | int rate, err; | |
324 | u32 tx_time, estimated_retx; | |
325 | u64 result; | |
326 | ||
327 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
328 | ||
329 | if (sta->fail_avg >= 100) | |
330 | return MAX_METRIC; | |
e6a9854b JB |
331 | |
332 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
333 | return MAX_METRIC; | |
334 | ||
050ac52c LCC |
335 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
336 | ||
337 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
338 | * 1Mbps. This will be corrected on tx_time computation. | |
339 | */ | |
e6a9854b | 340 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
341 | tx_time = (device_constant + 10 * test_frame_len / rate); |
342 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
343 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
344 | return (u32)result; | |
345 | } | |
346 | ||
347 | /** | |
348 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
349 | * | |
f698d856 | 350 | * @sdata: local mesh subif |
050ac52c LCC |
351 | * @mgmt: mesh management frame |
352 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
353 | * | |
354 | * This function updates the path routing information to the originator and the | |
f99288d1 | 355 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
356 | * |
357 | * Returns: metric to frame originator or 0 if the frame should not be further | |
358 | * processed | |
359 | * | |
360 | * Notes: this function is the only place (besides user-provided info) where | |
361 | * path routing information is updated. | |
362 | */ | |
f698d856 | 363 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 364 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 365 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 366 | { |
f698d856 | 367 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
368 | struct mesh_path *mpath; |
369 | struct sta_info *sta; | |
370 | bool fresh_info; | |
371 | u8 *orig_addr, *ta; | |
d19b3bf6 | 372 | u32 orig_sn, orig_metric; |
050ac52c LCC |
373 | unsigned long orig_lifetime, exp_time; |
374 | u32 last_hop_metric, new_metric; | |
375 | bool process = true; | |
050ac52c LCC |
376 | |
377 | rcu_read_lock(); | |
abe60632 | 378 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
379 | if (!sta) { |
380 | rcu_read_unlock(); | |
050ac52c | 381 | return 0; |
dc0b0f7d | 382 | } |
050ac52c LCC |
383 | |
384 | last_hop_metric = airtime_link_metric_get(local, sta); | |
385 | /* Update and check originator routing info */ | |
386 | fresh_info = true; | |
387 | ||
388 | switch (action) { | |
389 | case MPATH_PREQ: | |
390 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 391 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
392 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
393 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
394 | break; | |
395 | case MPATH_PREP: | |
396 | /* Originator here refers to the MP that was the destination in | |
397 | * the Path Request. The draft refers to that MP as the | |
398 | * destination address, even though usually it is the origin of | |
399 | * the PREP frame. We divert from the nomenclature in the draft | |
400 | * so that we can easily use a single function to gather path | |
401 | * information from both PREQ and PREP frames. | |
402 | */ | |
403 | orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 404 | orig_sn = PREP_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
405 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
406 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
407 | break; | |
408 | default: | |
dc0b0f7d | 409 | rcu_read_unlock(); |
050ac52c LCC |
410 | return 0; |
411 | } | |
412 | new_metric = orig_metric + last_hop_metric; | |
413 | if (new_metric < orig_metric) | |
414 | new_metric = MAX_METRIC; | |
415 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
416 | ||
47846c9b | 417 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
050ac52c LCC |
418 | /* This MP is the originator, we are not interested in this |
419 | * frame, except for updating transmitter's path info. | |
420 | */ | |
421 | process = false; | |
422 | fresh_info = false; | |
423 | } else { | |
f698d856 | 424 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
425 | if (mpath) { |
426 | spin_lock_bh(&mpath->state_lock); | |
427 | if (mpath->flags & MESH_PATH_FIXED) | |
428 | fresh_info = false; | |
429 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
430 | (mpath->flags & MESH_PATH_SN_VALID)) { |
431 | if (SN_GT(mpath->sn, orig_sn) || | |
432 | (mpath->sn == orig_sn && | |
533866b1 | 433 | new_metric >= mpath->metric)) { |
050ac52c LCC |
434 | process = false; |
435 | fresh_info = false; | |
436 | } | |
437 | } | |
438 | } else { | |
f698d856 JBG |
439 | mesh_path_add(orig_addr, sdata); |
440 | mpath = mesh_path_lookup(orig_addr, 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 | 451 | mpath->metric = new_metric; |
d19b3bf6 | 452 | mpath->sn = orig_sn; |
050ac52c LCC |
453 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
454 | ? mpath->exp_time : exp_time; | |
455 | mesh_path_activate(mpath); | |
456 | spin_unlock_bh(&mpath->state_lock); | |
457 | mesh_path_tx_pending(mpath); | |
458 | /* draft says preq_id should be saved to, but there does | |
459 | * not seem to be any use for it, skipping by now | |
460 | */ | |
461 | } else | |
462 | spin_unlock_bh(&mpath->state_lock); | |
463 | } | |
464 | ||
465 | /* Update and check transmitter routing info */ | |
466 | ta = mgmt->sa; | |
467 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
468 | fresh_info = false; | |
469 | else { | |
470 | fresh_info = true; | |
471 | ||
f698d856 | 472 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
473 | if (mpath) { |
474 | spin_lock_bh(&mpath->state_lock); | |
475 | if ((mpath->flags & MESH_PATH_FIXED) || | |
476 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
477 | (last_hop_metric > mpath->metric))) | |
478 | fresh_info = false; | |
479 | } else { | |
f698d856 JBG |
480 | mesh_path_add(ta, sdata); |
481 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
482 | if (!mpath) { |
483 | rcu_read_unlock(); | |
050ac52c LCC |
484 | return 0; |
485 | } | |
486 | spin_lock_bh(&mpath->state_lock); | |
487 | } | |
488 | ||
489 | if (fresh_info) { | |
490 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
491 | mpath->metric = last_hop_metric; |
492 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
493 | ? mpath->exp_time : exp_time; | |
494 | mesh_path_activate(mpath); | |
495 | spin_unlock_bh(&mpath->state_lock); | |
496 | mesh_path_tx_pending(mpath); | |
497 | } else | |
498 | spin_unlock_bh(&mpath->state_lock); | |
499 | } | |
500 | ||
050ac52c LCC |
501 | rcu_read_unlock(); |
502 | ||
503 | return process ? new_metric : 0; | |
504 | } | |
505 | ||
f698d856 | 506 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 507 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
508 | u8 *preq_elem, u32 metric) |
509 | { | |
472dbc45 | 510 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 511 | struct mesh_path *mpath; |
d19b3bf6 RP |
512 | u8 *target_addr, *orig_addr; |
513 | u8 target_flags, ttl; | |
514 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
515 | bool reply = false; |
516 | bool forward = true; | |
517 | ||
d19b3bf6 RP |
518 | /* Update target SN, if present */ |
519 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 520 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
521 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
522 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
523 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
050ac52c | 524 | |
7646887a | 525 | mhwmp_dbg("received PREQ from %pM", orig_addr); |
27db2e42 | 526 | |
47846c9b | 527 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
7646887a | 528 | mhwmp_dbg("PREQ is for us"); |
050ac52c LCC |
529 | forward = false; |
530 | reply = true; | |
531 | metric = 0; | |
d19b3bf6 | 532 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 533 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
534 | time_before(jiffies, ifmsh->last_sn_update)) { |
535 | target_sn = ++ifmsh->sn; | |
536 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
537 | } |
538 | } else { | |
539 | rcu_read_lock(); | |
d19b3bf6 | 540 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 541 | if (mpath) { |
d19b3bf6 RP |
542 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
543 | SN_LT(mpath->sn, target_sn)) { | |
544 | mpath->sn = target_sn; | |
545 | mpath->flags |= MESH_PATH_SN_VALID; | |
546 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
547 | (mpath->flags & MESH_PATH_ACTIVE)) { |
548 | reply = true; | |
549 | metric = mpath->metric; | |
d19b3bf6 RP |
550 | target_sn = mpath->sn; |
551 | if (target_flags & MP_F_RF) | |
552 | target_flags |= MP_F_DO; | |
050ac52c LCC |
553 | else |
554 | forward = false; | |
555 | } | |
556 | } | |
557 | rcu_read_unlock(); | |
558 | } | |
559 | ||
560 | if (reply) { | |
561 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 562 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 563 | if (ttl != 0) { |
7646887a | 564 | mhwmp_dbg("replying to the PREQ"); |
d19b3bf6 RP |
565 | mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr, |
566 | cpu_to_le32(target_sn), 0, orig_addr, | |
567 | cpu_to_le32(orig_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 568 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 569 | 0, sdata); |
27db2e42 | 570 | } else |
472dbc45 | 571 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
572 | } |
573 | ||
574 | if (forward) { | |
575 | u32 preq_id; | |
576 | u8 hopcount, flags; | |
577 | ||
578 | ttl = PREQ_IE_TTL(preq_elem); | |
579 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
580 | if (ttl <= 1) { | |
472dbc45 | 581 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
582 | return; |
583 | } | |
7646887a | 584 | mhwmp_dbg("forwarding the PREQ from %pM", orig_addr); |
050ac52c LCC |
585 | --ttl; |
586 | flags = PREQ_IE_FLAGS(preq_elem); | |
587 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
588 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
589 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
d19b3bf6 | 590 | cpu_to_le32(orig_sn), target_flags, target_addr, |
15ff6365 | 591 | cpu_to_le32(target_sn), broadcast_addr, |
aa2b5928 LCC |
592 | hopcount, ttl, cpu_to_le32(lifetime), |
593 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 594 | sdata); |
c8a61a7d | 595 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 596 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
597 | } |
598 | } | |
599 | ||
600 | ||
40b275b6 JB |
601 | static inline struct sta_info * |
602 | next_hop_deref_protected(struct mesh_path *mpath) | |
603 | { | |
604 | return rcu_dereference_protected(mpath->next_hop, | |
605 | lockdep_is_held(&mpath->state_lock)); | |
606 | } | |
607 | ||
608 | ||
f698d856 | 609 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
610 | struct ieee80211_mgmt *mgmt, |
611 | u8 *prep_elem, u32 metric) | |
612 | { | |
050ac52c | 613 | struct mesh_path *mpath; |
d19b3bf6 | 614 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
615 | u8 ttl, hopcount, flags; |
616 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 617 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 618 | |
7646887a | 619 | mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 620 | |
050ac52c LCC |
621 | /* Note that we divert from the draft nomenclature and denominate |
622 | * destination to what the draft refers to as origininator. So in this | |
623 | * function destnation refers to the final destination of the PREP, | |
624 | * which corresponds with the originator of the PREQ which this PREP | |
625 | * replies | |
626 | */ | |
d19b3bf6 | 627 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
47846c9b | 628 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) |
050ac52c LCC |
629 | /* destination, no forwarding required */ |
630 | return; | |
631 | ||
632 | ttl = PREP_IE_TTL(prep_elem); | |
633 | if (ttl <= 1) { | |
472dbc45 | 634 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
635 | return; |
636 | } | |
637 | ||
638 | rcu_read_lock(); | |
d19b3bf6 | 639 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
640 | if (mpath) |
641 | spin_lock_bh(&mpath->state_lock); | |
642 | else | |
643 | goto fail; | |
644 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
645 | spin_unlock_bh(&mpath->state_lock); | |
646 | goto fail; | |
647 | } | |
40b275b6 | 648 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
649 | spin_unlock_bh(&mpath->state_lock); |
650 | --ttl; | |
651 | flags = PREP_IE_FLAGS(prep_elem); | |
652 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
653 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
654 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); | |
d19b3bf6 RP |
655 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
656 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
657 | |
658 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 659 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 660 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 661 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 662 | 0, sdata); |
050ac52c | 663 | rcu_read_unlock(); |
c8a61a7d DW |
664 | |
665 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 666 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
667 | return; |
668 | ||
669 | fail: | |
670 | rcu_read_unlock(); | |
472dbc45 | 671 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
672 | } |
673 | ||
f698d856 | 674 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
675 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
676 | { | |
d611f062 | 677 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 678 | struct mesh_path *mpath; |
d611f062 | 679 | u8 ttl; |
d19b3bf6 | 680 | u8 *ta, *target_addr; |
d19b3bf6 RP |
681 | u32 target_sn; |
682 | u16 target_rcode; | |
050ac52c LCC |
683 | |
684 | ta = mgmt->sa; | |
d611f062 RP |
685 | ttl = PERR_IE_TTL(perr_elem); |
686 | if (ttl <= 1) { | |
687 | ifmsh->mshstats.dropped_frames_ttl++; | |
688 | return; | |
689 | } | |
690 | ttl--; | |
d19b3bf6 RP |
691 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
692 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
693 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 694 | |
050ac52c | 695 | rcu_read_lock(); |
d19b3bf6 | 696 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
697 | if (mpath) { |
698 | spin_lock_bh(&mpath->state_lock); | |
699 | if (mpath->flags & MESH_PATH_ACTIVE && | |
40b275b6 JB |
700 | memcmp(ta, next_hop_deref_protected(mpath)->sta.addr, |
701 | ETH_ALEN) == 0 && | |
d19b3bf6 RP |
702 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
703 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 704 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 705 | mpath->sn = target_sn; |
050ac52c | 706 | spin_unlock_bh(&mpath->state_lock); |
d19b3bf6 RP |
707 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
708 | cpu_to_le16(target_rcode), | |
15ff6365 | 709 | broadcast_addr, sdata); |
050ac52c LCC |
710 | } else |
711 | spin_unlock_bh(&mpath->state_lock); | |
712 | } | |
713 | rcu_read_unlock(); | |
714 | } | |
715 | ||
90a5e169 RP |
716 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
717 | struct ieee80211_mgmt *mgmt, | |
718 | struct ieee80211_rann_ie *rann) | |
719 | { | |
720 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
721 | struct mesh_path *mpath; | |
90a5e169 RP |
722 | u8 ttl, flags, hopcount; |
723 | u8 *orig_addr; | |
d19b3bf6 | 724 | u32 orig_sn, metric; |
0507e159 | 725 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
5ee68e5b | 726 | bool root_is_gate; |
90a5e169 | 727 | |
90a5e169 RP |
728 | ttl = rann->rann_ttl; |
729 | if (ttl <= 1) { | |
730 | ifmsh->mshstats.dropped_frames_ttl++; | |
731 | return; | |
732 | } | |
733 | ttl--; | |
734 | flags = rann->rann_flags; | |
5ee68e5b | 735 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 736 | orig_addr = rann->rann_addr; |
d19b3bf6 | 737 | orig_sn = rann->rann_seq; |
90a5e169 | 738 | hopcount = rann->rann_hopcount; |
a6a58b4f | 739 | hopcount++; |
90a5e169 | 740 | metric = rann->rann_metric; |
5ee68e5b JC |
741 | |
742 | /* Ignore our own RANNs */ | |
743 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) | |
744 | return; | |
745 | ||
746 | mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr, | |
747 | root_is_gate); | |
90a5e169 RP |
748 | |
749 | rcu_read_lock(); | |
750 | mpath = mesh_path_lookup(orig_addr, sdata); | |
751 | if (!mpath) { | |
752 | mesh_path_add(orig_addr, sdata); | |
753 | mpath = mesh_path_lookup(orig_addr, sdata); | |
754 | if (!mpath) { | |
755 | rcu_read_unlock(); | |
756 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
757 | return; | |
758 | } | |
90a5e169 | 759 | } |
5ee68e5b JC |
760 | |
761 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || | |
762 | time_after(jiffies, mpath->exp_time - 1*HZ)) && | |
763 | !(mpath->flags & MESH_PATH_FIXED)) { | |
764 | mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name, | |
765 | orig_addr); | |
766 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
767 | } | |
768 | ||
d19b3bf6 | 769 | if (mpath->sn < orig_sn) { |
90a5e169 | 770 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 771 | cpu_to_le32(orig_sn), |
15ff6365 | 772 | 0, NULL, 0, broadcast_addr, |
0507e159 | 773 | hopcount, ttl, cpu_to_le32(interval), |
a6a58b4f | 774 | cpu_to_le32(metric + mpath->metric), |
90a5e169 | 775 | 0, sdata); |
d19b3bf6 | 776 | mpath->sn = orig_sn; |
90a5e169 | 777 | } |
5ee68e5b JC |
778 | if (root_is_gate) |
779 | mesh_path_add_gate(mpath); | |
780 | ||
90a5e169 RP |
781 | rcu_read_unlock(); |
782 | } | |
050ac52c LCC |
783 | |
784 | ||
f698d856 | 785 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
786 | struct ieee80211_mgmt *mgmt, |
787 | size_t len) | |
788 | { | |
789 | struct ieee802_11_elems elems; | |
790 | size_t baselen; | |
791 | u32 last_hop_metric; | |
792 | ||
9c80d3dc JB |
793 | /* need action_code */ |
794 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
795 | return; | |
796 | ||
050ac52c LCC |
797 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
798 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
799 | len - baselen, &elems); | |
800 | ||
dbb81c42 RP |
801 | if (elems.preq) { |
802 | if (elems.preq_len != 37) | |
050ac52c LCC |
803 | /* Right now we support just 1 destination and no AE */ |
804 | return; | |
dbb81c42 RP |
805 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
806 | MPATH_PREQ); | |
807 | if (last_hop_metric) | |
808 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
809 | last_hop_metric); | |
810 | } | |
811 | if (elems.prep) { | |
812 | if (elems.prep_len != 31) | |
050ac52c LCC |
813 | /* Right now we support no AE */ |
814 | return; | |
dbb81c42 RP |
815 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
816 | MPATH_PREP); | |
817 | if (last_hop_metric) | |
818 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
819 | last_hop_metric); | |
820 | } | |
821 | if (elems.perr) { | |
d611f062 | 822 | if (elems.perr_len != 15) |
050ac52c LCC |
823 | /* Right now we support only one destination per PERR */ |
824 | return; | |
f698d856 | 825 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 826 | } |
90a5e169 RP |
827 | if (elems.rann) |
828 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
829 | } |
830 | ||
831 | /** | |
832 | * mesh_queue_preq - queue a PREQ to a given destination | |
833 | * | |
834 | * @mpath: mesh path to discover | |
835 | * @flags: special attributes of the PREQ to be sent | |
836 | * | |
837 | * Locking: the function must be called from within a rcu read lock block. | |
838 | * | |
839 | */ | |
840 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
841 | { | |
f698d856 | 842 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 843 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
844 | struct mesh_preq_queue *preq_node; |
845 | ||
59615b5f | 846 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 847 | if (!preq_node) { |
7646887a | 848 | mhwmp_dbg("could not allocate PREQ node"); |
050ac52c LCC |
849 | return; |
850 | } | |
851 | ||
987dafad | 852 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 853 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 854 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
855 | kfree(preq_node); |
856 | if (printk_ratelimit()) | |
7646887a | 857 | mhwmp_dbg("PREQ node queue full"); |
050ac52c LCC |
858 | return; |
859 | } | |
860 | ||
861 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); | |
862 | preq_node->flags = flags; | |
863 | ||
472dbc45 JB |
864 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
865 | ++ifmsh->preq_queue_len; | |
987dafad | 866 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 867 | |
472dbc45 | 868 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 869 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 870 | |
472dbc45 | 871 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
872 | /* avoid long wait if did not send preqs for a long time |
873 | * and jiffies wrapped around | |
874 | */ | |
472dbc45 | 875 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 876 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 877 | } else |
472dbc45 | 878 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
879 | min_preq_int_jiff(sdata)); |
880 | } | |
881 | ||
882 | /** | |
883 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
884 | * | |
f698d856 | 885 | * @sdata: local mesh subif |
050ac52c | 886 | */ |
f698d856 | 887 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 888 | { |
472dbc45 | 889 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
890 | struct mesh_preq_queue *preq_node; |
891 | struct mesh_path *mpath; | |
d19b3bf6 | 892 | u8 ttl, target_flags; |
050ac52c LCC |
893 | u32 lifetime; |
894 | ||
a43816df | 895 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
896 | if (!ifmsh->preq_queue_len || |
897 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 898 | min_preq_int_jiff(sdata))) { |
a43816df | 899 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
900 | return; |
901 | } | |
902 | ||
472dbc45 | 903 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
904 | struct mesh_preq_queue, list); |
905 | list_del(&preq_node->list); | |
472dbc45 | 906 | --ifmsh->preq_queue_len; |
a43816df | 907 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
908 | |
909 | rcu_read_lock(); | |
f698d856 | 910 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
911 | if (!mpath) |
912 | goto enddiscovery; | |
913 | ||
914 | spin_lock_bh(&mpath->state_lock); | |
915 | if (preq_node->flags & PREQ_Q_F_START) { | |
916 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
917 | spin_unlock_bh(&mpath->state_lock); | |
918 | goto enddiscovery; | |
919 | } else { | |
920 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
921 | mpath->flags |= MESH_PATH_RESOLVING; | |
922 | mpath->discovery_retries = 0; | |
923 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
924 | } | |
925 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
926 | mpath->flags & MESH_PATH_RESOLVED) { | |
927 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
928 | spin_unlock_bh(&mpath->state_lock); | |
929 | goto enddiscovery; | |
930 | } | |
931 | ||
472dbc45 | 932 | ifmsh->last_preq = jiffies; |
050ac52c | 933 | |
d19b3bf6 | 934 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 935 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
936 | time_before(jiffies, ifmsh->last_sn_update)) { |
937 | ++ifmsh->sn; | |
938 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
939 | } |
940 | lifetime = default_lifetime(sdata); | |
45904f21 | 941 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 942 | if (ttl == 0) { |
472dbc45 | 943 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
944 | spin_unlock_bh(&mpath->state_lock); |
945 | goto enddiscovery; | |
946 | } | |
947 | ||
948 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 949 | target_flags = MP_F_DO; |
050ac52c | 950 | else |
d19b3bf6 | 951 | target_flags = MP_F_RF; |
050ac52c LCC |
952 | |
953 | spin_unlock_bh(&mpath->state_lock); | |
47846c9b | 954 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 955 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
15ff6365 | 956 | cpu_to_le32(mpath->sn), broadcast_addr, 0, |
aa2b5928 | 957 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 958 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
959 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
960 | ||
961 | enddiscovery: | |
962 | rcu_read_unlock(); | |
963 | kfree(preq_node); | |
964 | } | |
965 | ||
966 | /** | |
2182b830 | 967 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame |
050ac52c | 968 | * |
e32f85f7 | 969 | * @skb: 802.11 frame to be sent |
f698d856 | 970 | * @sdata: network subif the frame will be sent through |
050ac52c LCC |
971 | * |
972 | * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is | |
973 | * found, the function will start a path discovery and queue the frame so it is | |
974 | * sent when the path is resolved. This means the caller must not free the skb | |
975 | * in this case. | |
976 | */ | |
f698d856 JBG |
977 | int mesh_nexthop_lookup(struct sk_buff *skb, |
978 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 979 | { |
050ac52c LCC |
980 | struct sk_buff *skb_to_free = NULL; |
981 | struct mesh_path *mpath; | |
40b275b6 | 982 | struct sta_info *next_hop; |
e32f85f7 | 983 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
d19b3bf6 | 984 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
985 | int err = 0; |
986 | ||
987 | rcu_read_lock(); | |
d19b3bf6 | 988 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
989 | |
990 | if (!mpath) { | |
d19b3bf6 RP |
991 | mesh_path_add(target_addr, sdata); |
992 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 993 | if (!mpath) { |
472dbc45 | 994 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
995 | err = -ENOSPC; |
996 | goto endlookup; | |
997 | } | |
998 | } | |
999 | ||
1000 | if (mpath->flags & MESH_PATH_ACTIVE) { | |
f64f9e71 | 1001 | if (time_after(jiffies, |
7b324d28 | 1002 | mpath->exp_time - |
f64f9e71 | 1003 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && |
47846c9b | 1004 | !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) && |
f64f9e71 JP |
1005 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1006 | !(mpath->flags & MESH_PATH_FIXED)) { | |
050ac52c LCC |
1007 | mesh_queue_preq(mpath, |
1008 | PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
1009 | } | |
40b275b6 JB |
1010 | next_hop = rcu_dereference(mpath->next_hop); |
1011 | if (next_hop) | |
1012 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1013 | else | |
1014 | err = -ENOENT; | |
050ac52c | 1015 | } else { |
249b405c | 1016 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
050ac52c LCC |
1017 | if (!(mpath->flags & MESH_PATH_RESOLVING)) { |
1018 | /* Start discovery only if it is not running yet */ | |
1019 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1020 | } | |
1021 | ||
1022 | if (skb_queue_len(&mpath->frame_queue) >= | |
fe583434 JC |
1023 | MESH_FRAME_QUEUE_LEN) |
1024 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
050ac52c | 1025 | |
249b405c | 1026 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
050ac52c LCC |
1027 | skb_queue_tail(&mpath->frame_queue, skb); |
1028 | if (skb_to_free) | |
f698d856 | 1029 | mesh_path_discard_frame(skb_to_free, sdata); |
050ac52c LCC |
1030 | err = -ENOENT; |
1031 | } | |
1032 | ||
1033 | endlookup: | |
1034 | rcu_read_unlock(); | |
1035 | return err; | |
1036 | } | |
1037 | ||
1038 | void mesh_path_timer(unsigned long data) | |
1039 | { | |
dea4096b JB |
1040 | struct mesh_path *mpath = (void *) data; |
1041 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1042 | int ret; |
5bb644a0 | 1043 | |
dea4096b | 1044 | if (sdata->local->quiescing) |
5bb644a0 | 1045 | return; |
5bb644a0 JB |
1046 | |
1047 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1048 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1049 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1050 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1051 | spin_unlock_bh(&mpath->state_lock); |
1052 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1053 | ++mpath->discovery_retries; |
1054 | mpath->discovery_timeout *= 2; | |
5ee68e5b | 1055 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1056 | mesh_queue_preq(mpath, 0); |
1057 | } else { | |
1058 | mpath->flags = 0; | |
1059 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1060 | spin_unlock_bh(&mpath->state_lock); |
1061 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1062 | ret = mesh_path_send_to_gates(mpath); | |
1063 | if (ret) | |
1064 | mhwmp_dbg("no gate was reachable"); | |
1065 | } else | |
1066 | mesh_path_flush_pending(mpath); | |
050ac52c | 1067 | } |
050ac52c | 1068 | } |
e304bfd3 RP |
1069 | |
1070 | void | |
1071 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1072 | { | |
1073 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1074 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
16dd7267 | 1075 | u8 flags; |
e304bfd3 | 1076 | |
16dd7267 JC |
1077 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1078 | ? RANN_FLAG_IS_GATE : 0; | |
1079 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1080 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1081 | 0, NULL, 0, broadcast_addr, |
45904f21 | 1082 | 0, sdata->u.mesh.mshcfg.element_ttl, |
0507e159 | 1083 | cpu_to_le32(interval), 0, 0, sdata); |
e304bfd3 | 1084 | } |