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> |
d26ad377 | 11 | #include <asm/unaligned.h> |
2cca397f | 12 | #include "wme.h" |
050ac52c LCC |
13 | #include "mesh.h" |
14 | ||
27db2e42 | 15 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
7646887a JC |
16 | #define mhwmp_dbg(fmt, args...) \ |
17 | printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args) | |
27db2e42 RP |
18 | #else |
19 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
20 | #endif | |
21 | ||
050ac52c LCC |
22 | #define TEST_FRAME_LEN 8192 |
23 | #define MAX_METRIC 0xffffffff | |
24 | #define ARITH_SHIFT 8 | |
25 | ||
26 | /* Number of frames buffered per destination for unresolved destinations */ | |
27 | #define MESH_FRAME_QUEUE_LEN 10 | |
28 | #define MAX_PREQ_QUEUE_LEN 64 | |
29 | ||
30 | /* Destination only */ | |
31 | #define MP_F_DO 0x1 | |
32 | /* Reply and forward */ | |
33 | #define MP_F_RF 0x2 | |
d611f062 RP |
34 | /* Unknown Sequence Number */ |
35 | #define MP_F_USN 0x01 | |
36 | /* Reason code Present */ | |
37 | #define MP_F_RCODE 0x02 | |
050ac52c | 38 | |
90a5e169 RP |
39 | static void mesh_queue_preq(struct mesh_path *, u8); |
40 | ||
a00de5d0 LCC |
41 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
42 | { | |
43 | if (ae) | |
44 | offset += 6; | |
ae7245cb | 45 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
46 | } |
47 | ||
d611f062 RP |
48 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
49 | { | |
50 | if (ae) | |
51 | offset += 6; | |
52 | return get_unaligned_le16(preq_elem + offset); | |
53 | } | |
54 | ||
050ac52c | 55 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
56 | #define AE_F (1<<6) |
57 | #define AE_F_SET(x) (*x & AE_F) | |
58 | #define PREQ_IE_FLAGS(x) (*(x)) | |
59 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
60 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
61 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
62 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
63 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
64 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
65 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
66 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
67 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 68 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
69 | |
70 | ||
71 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
72 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
73 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
74 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
75 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
76 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
77 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
78 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
79 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 80 | |
d611f062 | 81 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
82 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
83 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
84 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
85 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 86 | |
050ac52c | 87 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
88 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
89 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
90 | |
91 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 92 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 93 | #define default_lifetime(s) \ |
472dbc45 | 94 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 95 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
96 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
97 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 98 | #define disc_timeout_jiff(s) \ |
472dbc45 | 99 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
100 | |
101 | enum mpath_frame_type { | |
102 | MPATH_PREQ = 0, | |
103 | MPATH_PREP, | |
90a5e169 RP |
104 | MPATH_PERR, |
105 | MPATH_RANN | |
050ac52c LCC |
106 | }; |
107 | ||
15ff6365 JB |
108 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
109 | ||
050ac52c | 110 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 111 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
112 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
113 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 114 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 115 | { |
f698d856 | 116 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 117 | struct sk_buff *skb; |
050ac52c | 118 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
119 | u8 *pos, ie_len; |
120 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
121 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 122 | |
65e8b0cc | 123 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
124 | hdr_len + |
125 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
126 | if (!skb) |
127 | return -1; | |
65e8b0cc | 128 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
129 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
130 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
131 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
132 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
133 | |
134 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 135 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 136 | /* BSSID == SA */ |
47846c9b | 137 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
138 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
139 | mgmt->u.action.u.mesh_action.action_code = | |
140 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
141 | |
142 | switch (action) { | |
143 | case MPATH_PREQ: | |
7646887a | 144 | mhwmp_dbg("sending PREQ to %pM", target); |
050ac52c LCC |
145 | ie_len = 37; |
146 | pos = skb_put(skb, 2 + ie_len); | |
147 | *pos++ = WLAN_EID_PREQ; | |
148 | break; | |
149 | case MPATH_PREP: | |
7646887a | 150 | mhwmp_dbg("sending PREP to %pM", target); |
050ac52c LCC |
151 | ie_len = 31; |
152 | pos = skb_put(skb, 2 + ie_len); | |
153 | *pos++ = WLAN_EID_PREP; | |
154 | break; | |
90a5e169 | 155 | case MPATH_RANN: |
7646887a | 156 | mhwmp_dbg("sending RANN from %pM", orig_addr); |
90a5e169 RP |
157 | ie_len = sizeof(struct ieee80211_rann_ie); |
158 | pos = skb_put(skb, 2 + ie_len); | |
159 | *pos++ = WLAN_EID_RANN; | |
160 | break; | |
050ac52c | 161 | default: |
812714d7 | 162 | kfree_skb(skb); |
050ac52c LCC |
163 | return -ENOTSUPP; |
164 | break; | |
165 | } | |
166 | *pos++ = ie_len; | |
167 | *pos++ = flags; | |
168 | *pos++ = hop_count; | |
169 | *pos++ = ttl; | |
25d49e4d TP |
170 | if (action == MPATH_PREP) { |
171 | memcpy(pos, target, ETH_ALEN); | |
172 | pos += ETH_ALEN; | |
173 | memcpy(pos, &target_sn, 4); | |
050ac52c | 174 | pos += 4; |
25d49e4d TP |
175 | } else { |
176 | if (action == MPATH_PREQ) { | |
177 | memcpy(pos, &preq_id, 4); | |
178 | pos += 4; | |
179 | } | |
180 | memcpy(pos, orig_addr, ETH_ALEN); | |
181 | pos += ETH_ALEN; | |
182 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
183 | pos += 4; |
184 | } | |
25d49e4d TP |
185 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
186 | pos += 4; | |
050ac52c LCC |
187 | memcpy(pos, &metric, 4); |
188 | pos += 4; | |
189 | if (action == MPATH_PREQ) { | |
25d49e4d | 190 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 191 | *pos++ = target_flags; |
d19b3bf6 | 192 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 193 | pos += ETH_ALEN; |
d19b3bf6 | 194 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
195 | pos += 4; |
196 | } else if (action == MPATH_PREP) { | |
197 | memcpy(pos, orig_addr, ETH_ALEN); | |
198 | pos += ETH_ALEN; | |
199 | memcpy(pos, &orig_sn, 4); | |
200 | pos += 4; | |
90a5e169 | 201 | } |
050ac52c | 202 | |
62ae67be | 203 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
204 | return 0; |
205 | } | |
206 | ||
2cca397f JC |
207 | |
208 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
209 | * headroom in case the frame is encrypted. */ | |
210 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
211 | struct sk_buff *skb) | |
212 | { | |
2cca397f JC |
213 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
214 | ||
215 | skb_set_mac_header(skb, 0); | |
216 | skb_set_network_header(skb, 0); | |
217 | skb_set_transport_header(skb, 0); | |
218 | ||
219 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
220 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
221 | skb->priority = 7; | |
222 | ||
223 | info->control.vif = &sdata->vif; | |
2154c81c | 224 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
225 | } |
226 | ||
050ac52c LCC |
227 | /** |
228 | * mesh_send_path error - Sends a PERR mesh management frame | |
229 | * | |
d19b3bf6 RP |
230 | * @target: broken destination |
231 | * @target_sn: SN of the broken destination | |
232 | * @target_rcode: reason code for this PERR | |
050ac52c | 233 | * @ra: node this frame is addressed to |
2cca397f JC |
234 | * |
235 | * Note: This function may be called with driver locks taken that the driver | |
236 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
237 | * frame directly but add it to the pending queue instead. | |
050ac52c | 238 | */ |
d19b3bf6 | 239 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
240 | __le16 target_rcode, const u8 *ra, |
241 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 242 | { |
f698d856 | 243 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 244 | struct sk_buff *skb; |
dca7e943 | 245 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 246 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
247 | u8 *pos, ie_len; |
248 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
249 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 250 | |
dca7e943 TP |
251 | if (time_before(jiffies, ifmsh->next_perr)) |
252 | return -EAGAIN; | |
253 | ||
65e8b0cc | 254 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
255 | hdr_len + |
256 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
257 | if (!skb) |
258 | return -1; | |
65e8b0cc | 259 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
260 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
261 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
262 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
263 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
264 | |
265 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 266 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
267 | /* BSSID == SA */ |
268 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
269 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
270 | mgmt->u.action.u.mesh_action.action_code = | |
271 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 272 | ie_len = 15; |
050ac52c LCC |
273 | pos = skb_put(skb, 2 + ie_len); |
274 | *pos++ = WLAN_EID_PERR; | |
275 | *pos++ = ie_len; | |
d611f062 | 276 | /* ttl */ |
45904f21 | 277 | *pos++ = ttl; |
050ac52c LCC |
278 | /* number of destinations */ |
279 | *pos++ = 1; | |
d611f062 RP |
280 | /* |
281 | * flags bit, bit 1 is unset if we know the sequence number and | |
282 | * bit 2 is set if we have a reason code | |
283 | */ | |
284 | *pos = 0; | |
d19b3bf6 | 285 | if (!target_sn) |
d611f062 | 286 | *pos |= MP_F_USN; |
d19b3bf6 | 287 | if (target_rcode) |
d611f062 RP |
288 | *pos |= MP_F_RCODE; |
289 | pos++; | |
d19b3bf6 | 290 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 291 | pos += ETH_ALEN; |
d19b3bf6 | 292 | memcpy(pos, &target_sn, 4); |
d611f062 | 293 | pos += 4; |
d19b3bf6 | 294 | memcpy(pos, &target_rcode, 2); |
050ac52c | 295 | |
2cca397f JC |
296 | /* see note in function header */ |
297 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
298 | ifmsh->next_perr = TU_TO_EXP_TIME( |
299 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 300 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
301 | return 0; |
302 | } | |
303 | ||
bfc32e6a JC |
304 | void ieee80211s_update_metric(struct ieee80211_local *local, |
305 | struct sta_info *stainfo, struct sk_buff *skb) | |
306 | { | |
307 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
308 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
309 | int failed; | |
310 | ||
311 | if (!ieee80211_is_data(hdr->frame_control)) | |
312 | return; | |
313 | ||
314 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
315 | ||
316 | /* moving average, scaled to 100 */ | |
317 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
318 | if (stainfo->fail_avg > 95) | |
319 | mesh_plink_broken(stainfo); | |
320 | } | |
321 | ||
050ac52c LCC |
322 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
323 | struct sta_info *sta) | |
324 | { | |
325 | struct ieee80211_supported_band *sband; | |
326 | /* This should be adjusted for each device */ | |
327 | int device_constant = 1 << ARITH_SHIFT; | |
328 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
329 | int s_unit = 1 << ARITH_SHIFT; | |
330 | int rate, err; | |
331 | u32 tx_time, estimated_retx; | |
332 | u64 result; | |
333 | ||
334 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
335 | ||
336 | if (sta->fail_avg >= 100) | |
337 | return MAX_METRIC; | |
e6a9854b JB |
338 | |
339 | if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS) | |
340 | return MAX_METRIC; | |
341 | ||
050ac52c LCC |
342 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
343 | ||
344 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
345 | * 1Mbps. This will be corrected on tx_time computation. | |
346 | */ | |
e6a9854b | 347 | rate = sband->bitrates[sta->last_tx_rate.idx].bitrate; |
050ac52c LCC |
348 | tx_time = (device_constant + 10 * test_frame_len / rate); |
349 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
350 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
351 | return (u32)result; | |
352 | } | |
353 | ||
354 | /** | |
355 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
356 | * | |
f698d856 | 357 | * @sdata: local mesh subif |
050ac52c LCC |
358 | * @mgmt: mesh management frame |
359 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
360 | * | |
361 | * This function updates the path routing information to the originator and the | |
f99288d1 | 362 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
363 | * |
364 | * Returns: metric to frame originator or 0 if the frame should not be further | |
365 | * processed | |
366 | * | |
367 | * Notes: this function is the only place (besides user-provided info) where | |
368 | * path routing information is updated. | |
369 | */ | |
f698d856 | 370 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 371 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 372 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 373 | { |
f698d856 | 374 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
375 | struct mesh_path *mpath; |
376 | struct sta_info *sta; | |
377 | bool fresh_info; | |
378 | u8 *orig_addr, *ta; | |
d19b3bf6 | 379 | u32 orig_sn, orig_metric; |
050ac52c LCC |
380 | unsigned long orig_lifetime, exp_time; |
381 | u32 last_hop_metric, new_metric; | |
382 | bool process = true; | |
050ac52c LCC |
383 | |
384 | rcu_read_lock(); | |
abe60632 | 385 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
386 | if (!sta) { |
387 | rcu_read_unlock(); | |
050ac52c | 388 | return 0; |
dc0b0f7d | 389 | } |
050ac52c LCC |
390 | |
391 | last_hop_metric = airtime_link_metric_get(local, sta); | |
392 | /* Update and check originator routing info */ | |
393 | fresh_info = true; | |
394 | ||
395 | switch (action) { | |
396 | case MPATH_PREQ: | |
397 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 398 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
399 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
400 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
401 | break; | |
402 | case MPATH_PREP: | |
3c26f1f6 TP |
403 | /* Originator here refers to the MP that was the target in the |
404 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
405 | * so that we can easily use a single function to gather path |
406 | * information from both PREQ and PREP frames. | |
407 | */ | |
3c26f1f6 TP |
408 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
409 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
410 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
411 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
412 | break; | |
413 | default: | |
dc0b0f7d | 414 | rcu_read_unlock(); |
050ac52c LCC |
415 | return 0; |
416 | } | |
417 | new_metric = orig_metric + last_hop_metric; | |
418 | if (new_metric < orig_metric) | |
419 | new_metric = MAX_METRIC; | |
420 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
421 | ||
47846c9b | 422 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
050ac52c LCC |
423 | /* This MP is the originator, we are not interested in this |
424 | * frame, except for updating transmitter's path info. | |
425 | */ | |
426 | process = false; | |
427 | fresh_info = false; | |
428 | } else { | |
f698d856 | 429 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
430 | if (mpath) { |
431 | spin_lock_bh(&mpath->state_lock); | |
432 | if (mpath->flags & MESH_PATH_FIXED) | |
433 | fresh_info = false; | |
434 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
435 | (mpath->flags & MESH_PATH_SN_VALID)) { |
436 | if (SN_GT(mpath->sn, orig_sn) || | |
437 | (mpath->sn == orig_sn && | |
533866b1 | 438 | new_metric >= mpath->metric)) { |
050ac52c LCC |
439 | process = false; |
440 | fresh_info = false; | |
441 | } | |
442 | } | |
443 | } else { | |
f698d856 JBG |
444 | mesh_path_add(orig_addr, sdata); |
445 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
446 | if (!mpath) { |
447 | rcu_read_unlock(); | |
050ac52c LCC |
448 | return 0; |
449 | } | |
450 | spin_lock_bh(&mpath->state_lock); | |
451 | } | |
452 | ||
453 | if (fresh_info) { | |
454 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 455 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 456 | mpath->metric = new_metric; |
d19b3bf6 | 457 | mpath->sn = orig_sn; |
050ac52c LCC |
458 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
459 | ? mpath->exp_time : exp_time; | |
460 | mesh_path_activate(mpath); | |
461 | spin_unlock_bh(&mpath->state_lock); | |
462 | mesh_path_tx_pending(mpath); | |
463 | /* draft says preq_id should be saved to, but there does | |
464 | * not seem to be any use for it, skipping by now | |
465 | */ | |
466 | } else | |
467 | spin_unlock_bh(&mpath->state_lock); | |
468 | } | |
469 | ||
470 | /* Update and check transmitter routing info */ | |
471 | ta = mgmt->sa; | |
472 | if (memcmp(orig_addr, ta, ETH_ALEN) == 0) | |
473 | fresh_info = false; | |
474 | else { | |
475 | fresh_info = true; | |
476 | ||
f698d856 | 477 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
478 | if (mpath) { |
479 | spin_lock_bh(&mpath->state_lock); | |
480 | if ((mpath->flags & MESH_PATH_FIXED) || | |
481 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
482 | (last_hop_metric > mpath->metric))) | |
483 | fresh_info = false; | |
484 | } else { | |
f698d856 JBG |
485 | mesh_path_add(ta, sdata); |
486 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
487 | if (!mpath) { |
488 | rcu_read_unlock(); | |
050ac52c LCC |
489 | return 0; |
490 | } | |
491 | spin_lock_bh(&mpath->state_lock); | |
492 | } | |
493 | ||
494 | if (fresh_info) { | |
495 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
496 | mpath->metric = last_hop_metric; |
497 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
498 | ? mpath->exp_time : exp_time; | |
499 | mesh_path_activate(mpath); | |
500 | spin_unlock_bh(&mpath->state_lock); | |
501 | mesh_path_tx_pending(mpath); | |
502 | } else | |
503 | spin_unlock_bh(&mpath->state_lock); | |
504 | } | |
505 | ||
050ac52c LCC |
506 | rcu_read_unlock(); |
507 | ||
508 | return process ? new_metric : 0; | |
509 | } | |
510 | ||
f698d856 | 511 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 512 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
513 | u8 *preq_elem, u32 metric) |
514 | { | |
472dbc45 | 515 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 516 | struct mesh_path *mpath; |
d19b3bf6 RP |
517 | u8 *target_addr, *orig_addr; |
518 | u8 target_flags, ttl; | |
519 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
520 | bool reply = false; |
521 | bool forward = true; | |
522 | ||
d19b3bf6 RP |
523 | /* Update target SN, if present */ |
524 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 525 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
526 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
527 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
528 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
050ac52c | 529 | |
7646887a | 530 | mhwmp_dbg("received PREQ from %pM", orig_addr); |
27db2e42 | 531 | |
47846c9b | 532 | if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) { |
7646887a | 533 | mhwmp_dbg("PREQ is for us"); |
050ac52c LCC |
534 | forward = false; |
535 | reply = true; | |
536 | metric = 0; | |
d19b3bf6 | 537 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 538 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
539 | time_before(jiffies, ifmsh->last_sn_update)) { |
540 | target_sn = ++ifmsh->sn; | |
541 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
542 | } |
543 | } else { | |
544 | rcu_read_lock(); | |
d19b3bf6 | 545 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 546 | if (mpath) { |
d19b3bf6 RP |
547 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
548 | SN_LT(mpath->sn, target_sn)) { | |
549 | mpath->sn = target_sn; | |
550 | mpath->flags |= MESH_PATH_SN_VALID; | |
551 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
552 | (mpath->flags & MESH_PATH_ACTIVE)) { |
553 | reply = true; | |
554 | metric = mpath->metric; | |
d19b3bf6 RP |
555 | target_sn = mpath->sn; |
556 | if (target_flags & MP_F_RF) | |
557 | target_flags |= MP_F_DO; | |
050ac52c LCC |
558 | else |
559 | forward = false; | |
560 | } | |
561 | } | |
562 | rcu_read_unlock(); | |
563 | } | |
564 | ||
565 | if (reply) { | |
566 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 567 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 568 | if (ttl != 0) { |
7646887a | 569 | mhwmp_dbg("replying to the PREQ"); |
3c26f1f6 TP |
570 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
571 | cpu_to_le32(orig_sn), 0, target_addr, | |
572 | cpu_to_le32(target_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 573 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 574 | 0, sdata); |
27db2e42 | 575 | } else |
472dbc45 | 576 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
577 | } |
578 | ||
94f90656 | 579 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c LCC |
580 | u32 preq_id; |
581 | u8 hopcount, flags; | |
582 | ||
583 | ttl = PREQ_IE_TTL(preq_elem); | |
584 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
585 | if (ttl <= 1) { | |
472dbc45 | 586 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
587 | return; |
588 | } | |
7646887a | 589 | mhwmp_dbg("forwarding the PREQ from %pM", orig_addr); |
050ac52c LCC |
590 | --ttl; |
591 | flags = PREQ_IE_FLAGS(preq_elem); | |
592 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
593 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
594 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, | |
d19b3bf6 | 595 | cpu_to_le32(orig_sn), target_flags, target_addr, |
15ff6365 | 596 | cpu_to_le32(target_sn), broadcast_addr, |
aa2b5928 LCC |
597 | hopcount, ttl, cpu_to_le32(lifetime), |
598 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 599 | sdata); |
c8a61a7d | 600 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 601 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
602 | } |
603 | } | |
604 | ||
605 | ||
40b275b6 JB |
606 | static inline struct sta_info * |
607 | next_hop_deref_protected(struct mesh_path *mpath) | |
608 | { | |
609 | return rcu_dereference_protected(mpath->next_hop, | |
610 | lockdep_is_held(&mpath->state_lock)); | |
611 | } | |
612 | ||
613 | ||
f698d856 | 614 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
615 | struct ieee80211_mgmt *mgmt, |
616 | u8 *prep_elem, u32 metric) | |
617 | { | |
050ac52c | 618 | struct mesh_path *mpath; |
d19b3bf6 | 619 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
620 | u8 ttl, hopcount, flags; |
621 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 622 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 623 | |
7646887a | 624 | mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 625 | |
3c26f1f6 TP |
626 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
627 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) | |
050ac52c LCC |
628 | /* destination, no forwarding required */ |
629 | return; | |
630 | ||
631 | ttl = PREP_IE_TTL(prep_elem); | |
632 | if (ttl <= 1) { | |
472dbc45 | 633 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
634 | return; |
635 | } | |
636 | ||
637 | rcu_read_lock(); | |
3c26f1f6 | 638 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
639 | if (mpath) |
640 | spin_lock_bh(&mpath->state_lock); | |
641 | else | |
642 | goto fail; | |
643 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
644 | spin_unlock_bh(&mpath->state_lock); | |
645 | goto fail; | |
646 | } | |
40b275b6 | 647 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
648 | spin_unlock_bh(&mpath->state_lock); |
649 | --ttl; | |
650 | flags = PREP_IE_FLAGS(prep_elem); | |
651 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
652 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 653 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
654 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
655 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
656 | |
657 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 658 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 659 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 660 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 661 | 0, sdata); |
050ac52c | 662 | rcu_read_unlock(); |
c8a61a7d DW |
663 | |
664 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 665 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
666 | return; |
667 | ||
668 | fail: | |
669 | rcu_read_unlock(); | |
472dbc45 | 670 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
671 | } |
672 | ||
f698d856 | 673 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
674 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
675 | { | |
d611f062 | 676 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 677 | struct mesh_path *mpath; |
d611f062 | 678 | u8 ttl; |
d19b3bf6 | 679 | u8 *ta, *target_addr; |
d19b3bf6 RP |
680 | u32 target_sn; |
681 | u16 target_rcode; | |
050ac52c LCC |
682 | |
683 | ta = mgmt->sa; | |
d611f062 RP |
684 | ttl = PERR_IE_TTL(perr_elem); |
685 | if (ttl <= 1) { | |
686 | ifmsh->mshstats.dropped_frames_ttl++; | |
687 | return; | |
688 | } | |
689 | ttl--; | |
d19b3bf6 RP |
690 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
691 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
692 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 693 | |
050ac52c | 694 | rcu_read_lock(); |
d19b3bf6 | 695 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c LCC |
696 | if (mpath) { |
697 | spin_lock_bh(&mpath->state_lock); | |
698 | if (mpath->flags & MESH_PATH_ACTIVE && | |
40b275b6 JB |
699 | memcmp(ta, next_hop_deref_protected(mpath)->sta.addr, |
700 | ETH_ALEN) == 0 && | |
d19b3bf6 RP |
701 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
702 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 703 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 704 | mpath->sn = target_sn; |
050ac52c | 705 | spin_unlock_bh(&mpath->state_lock); |
d19b3bf6 RP |
706 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
707 | cpu_to_le16(target_rcode), | |
15ff6365 | 708 | broadcast_addr, sdata); |
050ac52c LCC |
709 | } else |
710 | spin_unlock_bh(&mpath->state_lock); | |
711 | } | |
712 | rcu_read_unlock(); | |
713 | } | |
714 | ||
90a5e169 RP |
715 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
716 | struct ieee80211_mgmt *mgmt, | |
717 | struct ieee80211_rann_ie *rann) | |
718 | { | |
719 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
720 | struct mesh_path *mpath; | |
90a5e169 RP |
721 | u8 ttl, flags, hopcount; |
722 | u8 *orig_addr; | |
d19b3bf6 | 723 | u32 orig_sn, metric; |
0507e159 | 724 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
5ee68e5b | 725 | bool root_is_gate; |
90a5e169 | 726 | |
90a5e169 RP |
727 | ttl = rann->rann_ttl; |
728 | if (ttl <= 1) { | |
729 | ifmsh->mshstats.dropped_frames_ttl++; | |
730 | return; | |
731 | } | |
732 | ttl--; | |
733 | flags = rann->rann_flags; | |
5ee68e5b | 734 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 735 | orig_addr = rann->rann_addr; |
d19b3bf6 | 736 | orig_sn = rann->rann_seq; |
90a5e169 | 737 | hopcount = rann->rann_hopcount; |
a6a58b4f | 738 | hopcount++; |
90a5e169 | 739 | metric = rann->rann_metric; |
5ee68e5b JC |
740 | |
741 | /* Ignore our own RANNs */ | |
742 | if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) | |
743 | return; | |
744 | ||
745 | mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr, | |
746 | root_is_gate); | |
90a5e169 RP |
747 | |
748 | rcu_read_lock(); | |
749 | mpath = mesh_path_lookup(orig_addr, sdata); | |
750 | if (!mpath) { | |
751 | mesh_path_add(orig_addr, sdata); | |
752 | mpath = mesh_path_lookup(orig_addr, sdata); | |
753 | if (!mpath) { | |
754 | rcu_read_unlock(); | |
755 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
756 | return; | |
757 | } | |
90a5e169 | 758 | } |
5ee68e5b JC |
759 | |
760 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || | |
761 | time_after(jiffies, mpath->exp_time - 1*HZ)) && | |
762 | !(mpath->flags & MESH_PATH_FIXED)) { | |
763 | mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name, | |
764 | orig_addr); | |
765 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
766 | } | |
767 | ||
d19b3bf6 | 768 | if (mpath->sn < orig_sn) { |
90a5e169 | 769 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 770 | cpu_to_le32(orig_sn), |
15ff6365 | 771 | 0, NULL, 0, broadcast_addr, |
0507e159 | 772 | hopcount, ttl, cpu_to_le32(interval), |
a6a58b4f | 773 | cpu_to_le32(metric + mpath->metric), |
90a5e169 | 774 | 0, sdata); |
d19b3bf6 | 775 | mpath->sn = orig_sn; |
90a5e169 | 776 | } |
5ee68e5b JC |
777 | if (root_is_gate) |
778 | mesh_path_add_gate(mpath); | |
779 | ||
90a5e169 RP |
780 | rcu_read_unlock(); |
781 | } | |
050ac52c LCC |
782 | |
783 | ||
f698d856 | 784 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
785 | struct ieee80211_mgmt *mgmt, |
786 | size_t len) | |
787 | { | |
788 | struct ieee802_11_elems elems; | |
789 | size_t baselen; | |
790 | u32 last_hop_metric; | |
97091317 | 791 | struct sta_info *sta; |
050ac52c | 792 | |
9c80d3dc JB |
793 | /* need action_code */ |
794 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
795 | return; | |
796 | ||
97091317 JC |
797 | rcu_read_lock(); |
798 | sta = sta_info_get(sdata, mgmt->sa); | |
799 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
800 | rcu_read_unlock(); | |
801 | return; | |
802 | } | |
803 | rcu_read_unlock(); | |
804 | ||
050ac52c LCC |
805 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
806 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
807 | len - baselen, &elems); | |
808 | ||
dbb81c42 RP |
809 | if (elems.preq) { |
810 | if (elems.preq_len != 37) | |
050ac52c LCC |
811 | /* Right now we support just 1 destination and no AE */ |
812 | return; | |
dbb81c42 RP |
813 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
814 | MPATH_PREQ); | |
815 | if (last_hop_metric) | |
816 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
817 | last_hop_metric); | |
818 | } | |
819 | if (elems.prep) { | |
820 | if (elems.prep_len != 31) | |
050ac52c LCC |
821 | /* Right now we support no AE */ |
822 | return; | |
dbb81c42 RP |
823 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
824 | MPATH_PREP); | |
825 | if (last_hop_metric) | |
826 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
827 | last_hop_metric); | |
828 | } | |
829 | if (elems.perr) { | |
d611f062 | 830 | if (elems.perr_len != 15) |
050ac52c LCC |
831 | /* Right now we support only one destination per PERR */ |
832 | return; | |
f698d856 | 833 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 834 | } |
90a5e169 RP |
835 | if (elems.rann) |
836 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
837 | } |
838 | ||
839 | /** | |
840 | * mesh_queue_preq - queue a PREQ to a given destination | |
841 | * | |
842 | * @mpath: mesh path to discover | |
843 | * @flags: special attributes of the PREQ to be sent | |
844 | * | |
845 | * Locking: the function must be called from within a rcu read lock block. | |
846 | * | |
847 | */ | |
848 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
849 | { | |
f698d856 | 850 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 851 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
852 | struct mesh_preq_queue *preq_node; |
853 | ||
59615b5f | 854 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 855 | if (!preq_node) { |
7646887a | 856 | mhwmp_dbg("could not allocate PREQ node"); |
050ac52c LCC |
857 | return; |
858 | } | |
859 | ||
987dafad | 860 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 861 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 862 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
863 | kfree(preq_node); |
864 | if (printk_ratelimit()) | |
7646887a | 865 | mhwmp_dbg("PREQ node queue full"); |
050ac52c LCC |
866 | return; |
867 | } | |
868 | ||
f2dc7989 | 869 | spin_lock(&mpath->state_lock); |
f3011cf9 | 870 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 871 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 872 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 873 | kfree(preq_node); |
f3011cf9 JC |
874 | return; |
875 | } | |
876 | ||
050ac52c LCC |
877 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
878 | preq_node->flags = flags; | |
879 | ||
f3011cf9 | 880 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 881 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 882 | |
472dbc45 JB |
883 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
884 | ++ifmsh->preq_queue_len; | |
987dafad | 885 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 886 | |
472dbc45 | 887 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 888 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 889 | |
472dbc45 | 890 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
891 | /* avoid long wait if did not send preqs for a long time |
892 | * and jiffies wrapped around | |
893 | */ | |
472dbc45 | 894 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 895 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 896 | } else |
472dbc45 | 897 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
898 | min_preq_int_jiff(sdata)); |
899 | } | |
900 | ||
901 | /** | |
902 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
903 | * | |
f698d856 | 904 | * @sdata: local mesh subif |
050ac52c | 905 | */ |
f698d856 | 906 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 907 | { |
472dbc45 | 908 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
909 | struct mesh_preq_queue *preq_node; |
910 | struct mesh_path *mpath; | |
d19b3bf6 | 911 | u8 ttl, target_flags; |
050ac52c LCC |
912 | u32 lifetime; |
913 | ||
a43816df | 914 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
915 | if (!ifmsh->preq_queue_len || |
916 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 917 | min_preq_int_jiff(sdata))) { |
a43816df | 918 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
919 | return; |
920 | } | |
921 | ||
472dbc45 | 922 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
923 | struct mesh_preq_queue, list); |
924 | list_del(&preq_node->list); | |
472dbc45 | 925 | --ifmsh->preq_queue_len; |
a43816df | 926 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
927 | |
928 | rcu_read_lock(); | |
f698d856 | 929 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
930 | if (!mpath) |
931 | goto enddiscovery; | |
932 | ||
933 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 934 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
935 | if (preq_node->flags & PREQ_Q_F_START) { |
936 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
937 | spin_unlock_bh(&mpath->state_lock); | |
938 | goto enddiscovery; | |
939 | } else { | |
940 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
941 | mpath->flags |= MESH_PATH_RESOLVING; | |
942 | mpath->discovery_retries = 0; | |
943 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
944 | } | |
945 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
946 | mpath->flags & MESH_PATH_RESOLVED) { | |
947 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
948 | spin_unlock_bh(&mpath->state_lock); | |
949 | goto enddiscovery; | |
950 | } | |
951 | ||
472dbc45 | 952 | ifmsh->last_preq = jiffies; |
050ac52c | 953 | |
d19b3bf6 | 954 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 955 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
956 | time_before(jiffies, ifmsh->last_sn_update)) { |
957 | ++ifmsh->sn; | |
958 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
959 | } |
960 | lifetime = default_lifetime(sdata); | |
45904f21 | 961 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 962 | if (ttl == 0) { |
472dbc45 | 963 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
964 | spin_unlock_bh(&mpath->state_lock); |
965 | goto enddiscovery; | |
966 | } | |
967 | ||
968 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 969 | target_flags = MP_F_DO; |
050ac52c | 970 | else |
d19b3bf6 | 971 | target_flags = MP_F_RF; |
050ac52c LCC |
972 | |
973 | spin_unlock_bh(&mpath->state_lock); | |
47846c9b | 974 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 975 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
15ff6365 | 976 | cpu_to_le32(mpath->sn), broadcast_addr, 0, |
aa2b5928 | 977 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 978 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
979 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
980 | ||
981 | enddiscovery: | |
982 | rcu_read_unlock(); | |
983 | kfree(preq_node); | |
984 | } | |
985 | ||
0cfda851 TP |
986 | /* mesh_nexthop_resolve - lookup next hop for given skb and start path |
987 | * discovery if no forwarding information is found. | |
050ac52c | 988 | * |
e32f85f7 | 989 | * @skb: 802.11 frame to be sent |
f698d856 | 990 | * @sdata: network subif the frame will be sent through |
050ac52c | 991 | * |
0cfda851 TP |
992 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
993 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 994 | */ |
0cfda851 TP |
995 | int mesh_nexthop_resolve(struct sk_buff *skb, |
996 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 997 | { |
e32f85f7 | 998 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
999 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1000 | struct mesh_path *mpath; | |
1001 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1002 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1003 | int err = 0; |
1004 | ||
1005 | rcu_read_lock(); | |
0cfda851 TP |
1006 | err = mesh_nexthop_lookup(skb, sdata); |
1007 | if (!err) | |
1008 | goto endlookup; | |
050ac52c | 1009 | |
0cfda851 TP |
1010 | /* no nexthop found, start resolving */ |
1011 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1012 | if (!mpath) { |
d19b3bf6 RP |
1013 | mesh_path_add(target_addr, sdata); |
1014 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1015 | if (!mpath) { |
0cfda851 | 1016 | mesh_path_discard_frame(skb, sdata); |
050ac52c LCC |
1017 | err = -ENOSPC; |
1018 | goto endlookup; | |
1019 | } | |
1020 | } | |
1021 | ||
0cfda851 TP |
1022 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1023 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1024 | ||
1025 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1026 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1027 | ||
1028 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1029 | ieee80211_set_qos_hdr(sdata, skb); | |
1030 | skb_queue_tail(&mpath->frame_queue, skb); | |
1031 | err = -ENOENT; | |
1032 | if (skb_to_free) | |
1033 | mesh_path_discard_frame(skb_to_free, sdata); | |
1034 | ||
1035 | endlookup: | |
1036 | rcu_read_unlock(); | |
1037 | return err; | |
1038 | } | |
1039 | /** | |
1040 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1041 | * this function is considered "using" the associated mpath, so preempt a path | |
1042 | * refresh if this mpath expires soon. | |
1043 | * | |
1044 | * @skb: 802.11 frame to be sent | |
1045 | * @sdata: network subif the frame will be sent through | |
1046 | * | |
1047 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1048 | */ | |
1049 | int mesh_nexthop_lookup(struct sk_buff *skb, | |
1050 | struct ieee80211_sub_if_data *sdata) | |
1051 | { | |
1052 | struct mesh_path *mpath; | |
1053 | struct sta_info *next_hop; | |
1054 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1055 | u8 *target_addr = hdr->addr3; | |
1056 | int err = -ENOENT; | |
050ac52c | 1057 | |
0cfda851 TP |
1058 | rcu_read_lock(); |
1059 | mpath = mesh_path_lookup(target_addr, sdata); | |
1060 | ||
1061 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1062 | goto endlookup; | |
1063 | ||
1064 | if (time_after(jiffies, | |
1065 | mpath->exp_time - | |
1066 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
1067 | !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) && | |
1068 | !(mpath->flags & MESH_PATH_RESOLVING) && | |
1069 | !(mpath->flags & MESH_PATH_FIXED)) | |
1070 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1071 | |
0cfda851 TP |
1072 | next_hop = rcu_dereference(mpath->next_hop); |
1073 | if (next_hop) { | |
1074 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1075 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1076 | err = 0; | |
050ac52c LCC |
1077 | } |
1078 | ||
1079 | endlookup: | |
1080 | rcu_read_unlock(); | |
1081 | return err; | |
1082 | } | |
1083 | ||
1084 | void mesh_path_timer(unsigned long data) | |
1085 | { | |
dea4096b JB |
1086 | struct mesh_path *mpath = (void *) data; |
1087 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1088 | int ret; |
5bb644a0 | 1089 | |
dea4096b | 1090 | if (sdata->local->quiescing) |
5bb644a0 | 1091 | return; |
5bb644a0 JB |
1092 | |
1093 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1094 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1095 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1096 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1097 | spin_unlock_bh(&mpath->state_lock); |
1098 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1099 | ++mpath->discovery_retries; |
1100 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1101 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1102 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1103 | mesh_queue_preq(mpath, 0); |
1104 | } else { | |
1105 | mpath->flags = 0; | |
1106 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1107 | spin_unlock_bh(&mpath->state_lock); |
1108 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1109 | ret = mesh_path_send_to_gates(mpath); | |
1110 | if (ret) | |
1111 | mhwmp_dbg("no gate was reachable"); | |
1112 | } else | |
1113 | mesh_path_flush_pending(mpath); | |
050ac52c | 1114 | } |
050ac52c | 1115 | } |
e304bfd3 RP |
1116 | |
1117 | void | |
1118 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1119 | { | |
1120 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1121 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
16dd7267 | 1122 | u8 flags; |
e304bfd3 | 1123 | |
16dd7267 JC |
1124 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1125 | ? RANN_FLAG_IS_GATE : 0; | |
1126 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1127 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1128 | 0, NULL, 0, broadcast_addr, |
45904f21 | 1129 | 0, sdata->u.mesh.mshcfg.element_ttl, |
0507e159 | 1130 | cpu_to_le32(interval), 0, 0, sdata); |
e304bfd3 | 1131 | } |