Commit | Line | Data |
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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> |
888d04df | 11 | #include <linux/etherdevice.h> |
d26ad377 | 12 | #include <asm/unaligned.h> |
2cca397f | 13 | #include "wme.h" |
050ac52c LCC |
14 | #include "mesh.h" |
15 | ||
050ac52c LCC |
16 | #define TEST_FRAME_LEN 8192 |
17 | #define MAX_METRIC 0xffffffff | |
18 | #define ARITH_SHIFT 8 | |
19 | ||
20 | /* Number of frames buffered per destination for unresolved destinations */ | |
21 | #define MESH_FRAME_QUEUE_LEN 10 | |
22 | #define MAX_PREQ_QUEUE_LEN 64 | |
23 | ||
24 | /* Destination only */ | |
25 | #define MP_F_DO 0x1 | |
26 | /* Reply and forward */ | |
27 | #define MP_F_RF 0x2 | |
d611f062 RP |
28 | /* Unknown Sequence Number */ |
29 | #define MP_F_USN 0x01 | |
30 | /* Reason code Present */ | |
31 | #define MP_F_RCODE 0x02 | |
050ac52c | 32 | |
90a5e169 RP |
33 | static void mesh_queue_preq(struct mesh_path *, u8); |
34 | ||
a00de5d0 LCC |
35 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
36 | { | |
37 | if (ae) | |
38 | offset += 6; | |
ae7245cb | 39 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
40 | } |
41 | ||
d611f062 RP |
42 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
43 | { | |
44 | if (ae) | |
45 | offset += 6; | |
46 | return get_unaligned_le16(preq_elem + offset); | |
47 | } | |
48 | ||
050ac52c | 49 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
50 | #define AE_F (1<<6) |
51 | #define AE_F_SET(x) (*x & AE_F) | |
52 | #define PREQ_IE_FLAGS(x) (*(x)) | |
53 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
54 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
55 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
56 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
57 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
58 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
59 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
60 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
61 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 62 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
63 | |
64 | ||
65 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
66 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
67 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
68 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
69 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
70 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
71 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
72 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
73 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 74 | |
d611f062 | 75 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
76 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
77 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
78 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
79 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 80 | |
050ac52c | 81 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
82 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
83 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
050ac52c LCC |
84 | |
85 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 86 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 87 | #define default_lifetime(s) \ |
472dbc45 | 88 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 89 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
90 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
91 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 92 | #define disc_timeout_jiff(s) \ |
472dbc45 | 93 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
94 | #define root_path_confirmation_jiffies(s) \ |
95 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
96 | |
97 | enum mpath_frame_type { | |
98 | MPATH_PREQ = 0, | |
99 | MPATH_PREP, | |
90a5e169 RP |
100 | MPATH_PERR, |
101 | MPATH_RANN | |
050ac52c LCC |
102 | }; |
103 | ||
15ff6365 JB |
104 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
105 | ||
050ac52c | 106 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 107 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
108 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
109 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 110 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 111 | { |
f698d856 | 112 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 113 | struct sk_buff *skb; |
050ac52c | 114 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
115 | u8 *pos, ie_len; |
116 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
117 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 118 | |
65e8b0cc | 119 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
120 | hdr_len + |
121 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
122 | if (!skb) |
123 | return -1; | |
65e8b0cc | 124 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
125 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
126 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
127 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
128 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
129 | |
130 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 131 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 132 | /* BSSID == SA */ |
47846c9b | 133 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
134 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
135 | mgmt->u.action.u.mesh_action.action_code = | |
136 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
137 | |
138 | switch (action) { | |
139 | case MPATH_PREQ: | |
bdcbd8e0 | 140 | mhwmp_dbg(sdata, "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: | |
bdcbd8e0 | 146 | mhwmp_dbg(sdata, "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 | 151 | case MPATH_RANN: |
bdcbd8e0 | 152 | mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
90a5e169 RP |
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; | |
25d49e4d TP |
166 | if (action == MPATH_PREP) { |
167 | memcpy(pos, target, ETH_ALEN); | |
168 | pos += ETH_ALEN; | |
169 | memcpy(pos, &target_sn, 4); | |
050ac52c | 170 | pos += 4; |
25d49e4d TP |
171 | } else { |
172 | if (action == MPATH_PREQ) { | |
173 | memcpy(pos, &preq_id, 4); | |
174 | pos += 4; | |
175 | } | |
176 | memcpy(pos, orig_addr, ETH_ALEN); | |
177 | pos += ETH_ALEN; | |
178 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
179 | pos += 4; |
180 | } | |
25d49e4d TP |
181 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
182 | pos += 4; | |
050ac52c LCC |
183 | memcpy(pos, &metric, 4); |
184 | pos += 4; | |
185 | if (action == MPATH_PREQ) { | |
25d49e4d | 186 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 187 | *pos++ = target_flags; |
d19b3bf6 | 188 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 189 | pos += ETH_ALEN; |
d19b3bf6 | 190 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
191 | pos += 4; |
192 | } else if (action == MPATH_PREP) { | |
193 | memcpy(pos, orig_addr, ETH_ALEN); | |
194 | pos += ETH_ALEN; | |
195 | memcpy(pos, &orig_sn, 4); | |
196 | pos += 4; | |
90a5e169 | 197 | } |
050ac52c | 198 | |
62ae67be | 199 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
200 | return 0; |
201 | } | |
202 | ||
2cca397f JC |
203 | |
204 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
205 | * headroom in case the frame is encrypted. */ | |
206 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
207 | struct sk_buff *skb) | |
208 | { | |
2cca397f JC |
209 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
210 | ||
211 | skb_set_mac_header(skb, 0); | |
212 | skb_set_network_header(skb, 0); | |
213 | skb_set_transport_header(skb, 0); | |
214 | ||
215 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
216 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
217 | skb->priority = 7; | |
218 | ||
219 | info->control.vif = &sdata->vif; | |
2154c81c | 220 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
221 | } |
222 | ||
050ac52c LCC |
223 | /** |
224 | * mesh_send_path error - Sends a PERR mesh management frame | |
225 | * | |
d19b3bf6 RP |
226 | * @target: broken destination |
227 | * @target_sn: SN of the broken destination | |
228 | * @target_rcode: reason code for this PERR | |
050ac52c | 229 | * @ra: node this frame is addressed to |
2cca397f JC |
230 | * |
231 | * Note: This function may be called with driver locks taken that the driver | |
232 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
233 | * frame directly but add it to the pending queue instead. | |
050ac52c | 234 | */ |
d19b3bf6 | 235 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
236 | __le16 target_rcode, const u8 *ra, |
237 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 238 | { |
f698d856 | 239 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 240 | struct sk_buff *skb; |
dca7e943 | 241 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 242 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
243 | u8 *pos, ie_len; |
244 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
245 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 246 | |
dca7e943 TP |
247 | if (time_before(jiffies, ifmsh->next_perr)) |
248 | return -EAGAIN; | |
249 | ||
65e8b0cc | 250 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
251 | hdr_len + |
252 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
253 | if (!skb) |
254 | return -1; | |
65e8b0cc | 255 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
256 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
257 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
258 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
259 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
260 | |
261 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 262 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
263 | /* BSSID == SA */ |
264 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
265 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
266 | mgmt->u.action.u.mesh_action.action_code = | |
267 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 268 | ie_len = 15; |
050ac52c LCC |
269 | pos = skb_put(skb, 2 + ie_len); |
270 | *pos++ = WLAN_EID_PERR; | |
271 | *pos++ = ie_len; | |
d611f062 | 272 | /* ttl */ |
45904f21 | 273 | *pos++ = ttl; |
050ac52c LCC |
274 | /* number of destinations */ |
275 | *pos++ = 1; | |
d611f062 RP |
276 | /* |
277 | * flags bit, bit 1 is unset if we know the sequence number and | |
278 | * bit 2 is set if we have a reason code | |
279 | */ | |
280 | *pos = 0; | |
d19b3bf6 | 281 | if (!target_sn) |
d611f062 | 282 | *pos |= MP_F_USN; |
d19b3bf6 | 283 | if (target_rcode) |
d611f062 RP |
284 | *pos |= MP_F_RCODE; |
285 | pos++; | |
d19b3bf6 | 286 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 287 | pos += ETH_ALEN; |
d19b3bf6 | 288 | memcpy(pos, &target_sn, 4); |
d611f062 | 289 | pos += 4; |
d19b3bf6 | 290 | memcpy(pos, &target_rcode, 2); |
050ac52c | 291 | |
2cca397f JC |
292 | /* see note in function header */ |
293 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
294 | ifmsh->next_perr = TU_TO_EXP_TIME( |
295 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 296 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
297 | return 0; |
298 | } | |
299 | ||
bfc32e6a | 300 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 301 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
302 | { |
303 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
304 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
305 | int failed; | |
306 | ||
307 | if (!ieee80211_is_data(hdr->frame_control)) | |
308 | return; | |
309 | ||
310 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
311 | ||
312 | /* moving average, scaled to 100 */ | |
35b3fe1c JC |
313 | sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); |
314 | if (sta->fail_avg > 95) | |
315 | mesh_plink_broken(sta); | |
bfc32e6a JC |
316 | } |
317 | ||
050ac52c LCC |
318 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
319 | struct sta_info *sta) | |
320 | { | |
6b62bf32 | 321 | struct rate_info rinfo; |
050ac52c LCC |
322 | /* This should be adjusted for each device */ |
323 | int device_constant = 1 << ARITH_SHIFT; | |
324 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
325 | int s_unit = 1 << ARITH_SHIFT; | |
326 | int rate, err; | |
327 | u32 tx_time, estimated_retx; | |
328 | u64 result; | |
329 | ||
050ac52c LCC |
330 | if (sta->fail_avg >= 100) |
331 | return MAX_METRIC; | |
e6a9854b | 332 | |
6b62bf32 TP |
333 | sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); |
334 | rate = cfg80211_calculate_bitrate(&rinfo); | |
335 | if (WARN_ON(!rate)) | |
e6a9854b JB |
336 | return MAX_METRIC; |
337 | ||
050ac52c LCC |
338 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
339 | ||
340 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
341 | * 1Mbps. This will be corrected on tx_time computation. | |
342 | */ | |
050ac52c LCC |
343 | tx_time = (device_constant + 10 * test_frame_len / rate); |
344 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
345 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
346 | return (u32)result; | |
347 | } | |
348 | ||
349 | /** | |
350 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
351 | * | |
f698d856 | 352 | * @sdata: local mesh subif |
050ac52c LCC |
353 | * @mgmt: mesh management frame |
354 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
355 | * | |
356 | * This function updates the path routing information to the originator and the | |
f99288d1 | 357 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
358 | * |
359 | * Returns: metric to frame originator or 0 if the frame should not be further | |
360 | * processed | |
361 | * | |
362 | * Notes: this function is the only place (besides user-provided info) where | |
363 | * path routing information is updated. | |
364 | */ | |
f698d856 | 365 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 366 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 367 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 368 | { |
f698d856 | 369 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
370 | struct mesh_path *mpath; |
371 | struct sta_info *sta; | |
372 | bool fresh_info; | |
373 | u8 *orig_addr, *ta; | |
d19b3bf6 | 374 | u32 orig_sn, orig_metric; |
050ac52c LCC |
375 | unsigned long orig_lifetime, exp_time; |
376 | u32 last_hop_metric, new_metric; | |
377 | bool process = true; | |
050ac52c LCC |
378 | |
379 | rcu_read_lock(); | |
abe60632 | 380 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
381 | if (!sta) { |
382 | rcu_read_unlock(); | |
050ac52c | 383 | return 0; |
dc0b0f7d | 384 | } |
050ac52c LCC |
385 | |
386 | last_hop_metric = airtime_link_metric_get(local, sta); | |
387 | /* Update and check originator routing info */ | |
388 | fresh_info = true; | |
389 | ||
390 | switch (action) { | |
391 | case MPATH_PREQ: | |
392 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 393 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
394 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
395 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
396 | break; | |
397 | case MPATH_PREP: | |
3c26f1f6 TP |
398 | /* Originator here refers to the MP that was the target in the |
399 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
400 | * so that we can easily use a single function to gather path |
401 | * information from both PREQ and PREP frames. | |
402 | */ | |
3c26f1f6 TP |
403 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
404 | orig_sn = PREP_IE_TARGET_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 | ||
b203ca39 | 417 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
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; | |
b203ca39 | 467 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
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; |
3d045a54 | 511 | struct mesh_path *mpath = NULL; |
d19b3bf6 | 512 | u8 *target_addr, *orig_addr; |
3d045a54 | 513 | const u8 *da; |
3fbf4b71 CYY |
514 | u8 target_flags, ttl, flags; |
515 | u32 orig_sn, target_sn, lifetime, orig_metric; | |
050ac52c LCC |
516 | bool reply = false; |
517 | bool forward = true; | |
3fbf4b71 | 518 | bool root_is_gate; |
050ac52c | 519 | |
d19b3bf6 RP |
520 | /* Update target SN, if present */ |
521 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 522 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
523 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
524 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
525 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
526 | orig_metric = metric; |
527 | /* Proactive PREQ gate announcements */ | |
528 | flags = PREQ_IE_FLAGS(preq_elem); | |
529 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 530 | |
bdcbd8e0 | 531 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 532 | |
b203ca39 | 533 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 534 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
535 | forward = false; |
536 | reply = true; | |
537 | metric = 0; | |
d19b3bf6 | 538 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 539 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
540 | time_before(jiffies, ifmsh->last_sn_update)) { |
541 | target_sn = ++ifmsh->sn; | |
542 | ifmsh->last_sn_update = jiffies; | |
050ac52c | 543 | } |
3fbf4b71 CYY |
544 | } else if (is_broadcast_ether_addr(target_addr) && |
545 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
546 | rcu_read_lock(); | |
547 | mpath = mesh_path_lookup(orig_addr, sdata); | |
548 | if (mpath) { | |
549 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
550 | reply = true; | |
551 | target_addr = sdata->vif.addr; | |
552 | target_sn = ++ifmsh->sn; | |
553 | metric = 0; | |
554 | ifmsh->last_sn_update = jiffies; | |
555 | } | |
556 | if (root_is_gate) | |
557 | mesh_path_add_gate(mpath); | |
558 | } | |
559 | rcu_read_unlock(); | |
050ac52c LCC |
560 | } else { |
561 | rcu_read_lock(); | |
d19b3bf6 | 562 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 563 | if (mpath) { |
d19b3bf6 RP |
564 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
565 | SN_LT(mpath->sn, target_sn)) { | |
566 | mpath->sn = target_sn; | |
567 | mpath->flags |= MESH_PATH_SN_VALID; | |
568 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
569 | (mpath->flags & MESH_PATH_ACTIVE)) { |
570 | reply = true; | |
571 | metric = mpath->metric; | |
d19b3bf6 RP |
572 | target_sn = mpath->sn; |
573 | if (target_flags & MP_F_RF) | |
574 | target_flags |= MP_F_DO; | |
050ac52c LCC |
575 | else |
576 | forward = false; | |
577 | } | |
578 | } | |
579 | rcu_read_unlock(); | |
580 | } | |
581 | ||
582 | if (reply) { | |
583 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 584 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 585 | if (ttl != 0) { |
bdcbd8e0 | 586 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 TP |
587 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
588 | cpu_to_le32(orig_sn), 0, target_addr, | |
589 | cpu_to_le32(target_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 590 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 591 | 0, sdata); |
3fbf4b71 | 592 | } else { |
472dbc45 | 593 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 594 | } |
050ac52c LCC |
595 | } |
596 | ||
94f90656 | 597 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 598 | u32 preq_id; |
3fbf4b71 | 599 | u8 hopcount; |
050ac52c LCC |
600 | |
601 | ttl = PREQ_IE_TTL(preq_elem); | |
602 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
603 | if (ttl <= 1) { | |
472dbc45 | 604 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
605 | return; |
606 | } | |
bdcbd8e0 | 607 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 608 | --ttl; |
050ac52c LCC |
609 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
610 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
611 | da = (mpath && mpath->is_root) ? |
612 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
613 | |
614 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
615 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
616 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
617 | metric = orig_metric; | |
618 | } | |
619 | ||
050ac52c | 620 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
d19b3bf6 | 621 | cpu_to_le32(orig_sn), target_flags, target_addr, |
3d045a54 | 622 | cpu_to_le32(target_sn), da, |
aa2b5928 LCC |
623 | hopcount, ttl, cpu_to_le32(lifetime), |
624 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 625 | sdata); |
7d4e15b1 CYY |
626 | if (!is_multicast_ether_addr(da)) |
627 | ifmsh->mshstats.fwded_unicast++; | |
628 | else | |
629 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 630 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
631 | } |
632 | } | |
633 | ||
634 | ||
40b275b6 JB |
635 | static inline struct sta_info * |
636 | next_hop_deref_protected(struct mesh_path *mpath) | |
637 | { | |
638 | return rcu_dereference_protected(mpath->next_hop, | |
639 | lockdep_is_held(&mpath->state_lock)); | |
640 | } | |
641 | ||
642 | ||
f698d856 | 643 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
644 | struct ieee80211_mgmt *mgmt, |
645 | u8 *prep_elem, u32 metric) | |
646 | { | |
d665508b | 647 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 648 | struct mesh_path *mpath; |
d19b3bf6 | 649 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
650 | u8 ttl, hopcount, flags; |
651 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 652 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 653 | |
bdcbd8e0 JB |
654 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
655 | PREP_IE_ORIG_ADDR(prep_elem)); | |
dbb81c42 | 656 | |
3c26f1f6 | 657 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 658 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
659 | /* destination, no forwarding required */ |
660 | return; | |
661 | ||
d665508b CYY |
662 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
663 | return; | |
664 | ||
050ac52c LCC |
665 | ttl = PREP_IE_TTL(prep_elem); |
666 | if (ttl <= 1) { | |
472dbc45 | 667 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
668 | return; |
669 | } | |
670 | ||
671 | rcu_read_lock(); | |
3c26f1f6 | 672 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
673 | if (mpath) |
674 | spin_lock_bh(&mpath->state_lock); | |
675 | else | |
676 | goto fail; | |
677 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
678 | spin_unlock_bh(&mpath->state_lock); | |
679 | goto fail; | |
680 | } | |
40b275b6 | 681 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
682 | spin_unlock_bh(&mpath->state_lock); |
683 | --ttl; | |
684 | flags = PREP_IE_FLAGS(prep_elem); | |
685 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
686 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 687 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
688 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
689 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
690 | |
691 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 692 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 693 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 694 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 695 | 0, sdata); |
050ac52c | 696 | rcu_read_unlock(); |
c8a61a7d DW |
697 | |
698 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 699 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
700 | return; |
701 | ||
702 | fail: | |
703 | rcu_read_unlock(); | |
472dbc45 | 704 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
705 | } |
706 | ||
f698d856 | 707 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
708 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
709 | { | |
d611f062 | 710 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 711 | struct mesh_path *mpath; |
d611f062 | 712 | u8 ttl; |
d19b3bf6 | 713 | u8 *ta, *target_addr; |
d19b3bf6 RP |
714 | u32 target_sn; |
715 | u16 target_rcode; | |
050ac52c LCC |
716 | |
717 | ta = mgmt->sa; | |
d611f062 RP |
718 | ttl = PERR_IE_TTL(perr_elem); |
719 | if (ttl <= 1) { | |
720 | ifmsh->mshstats.dropped_frames_ttl++; | |
721 | return; | |
722 | } | |
723 | ttl--; | |
d19b3bf6 RP |
724 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
725 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
726 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 727 | |
050ac52c | 728 | rcu_read_lock(); |
d19b3bf6 | 729 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 730 | if (mpath) { |
888d04df FF |
731 | struct sta_info *sta; |
732 | ||
050ac52c | 733 | spin_lock_bh(&mpath->state_lock); |
888d04df | 734 | sta = next_hop_deref_protected(mpath); |
050ac52c | 735 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 736 | ether_addr_equal(ta, sta->sta.addr) && |
d19b3bf6 RP |
737 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
738 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 739 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 740 | mpath->sn = target_sn; |
050ac52c | 741 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
742 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
743 | goto endperr; | |
d19b3bf6 RP |
744 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
745 | cpu_to_le16(target_rcode), | |
15ff6365 | 746 | broadcast_addr, sdata); |
050ac52c LCC |
747 | } else |
748 | spin_unlock_bh(&mpath->state_lock); | |
749 | } | |
d665508b | 750 | endperr: |
050ac52c LCC |
751 | rcu_read_unlock(); |
752 | } | |
753 | ||
90a5e169 RP |
754 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
755 | struct ieee80211_mgmt *mgmt, | |
756 | struct ieee80211_rann_ie *rann) | |
757 | { | |
758 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
759 | struct ieee80211_local *local = sdata->local; |
760 | struct sta_info *sta; | |
90a5e169 | 761 | struct mesh_path *mpath; |
90a5e169 RP |
762 | u8 ttl, flags, hopcount; |
763 | u8 *orig_addr; | |
d2a079fd | 764 | u32 orig_sn, metric, metric_txsta, interval; |
5ee68e5b | 765 | bool root_is_gate; |
90a5e169 | 766 | |
90a5e169 | 767 | ttl = rann->rann_ttl; |
90a5e169 | 768 | flags = rann->rann_flags; |
5ee68e5b | 769 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 770 | orig_addr = rann->rann_addr; |
292c41ac | 771 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 772 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 773 | hopcount = rann->rann_hopcount; |
a6a58b4f | 774 | hopcount++; |
292c41ac | 775 | metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
776 | |
777 | /* Ignore our own RANNs */ | |
b203ca39 | 778 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
779 | return; |
780 | ||
bdcbd8e0 JB |
781 | mhwmp_dbg(sdata, |
782 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
783 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
784 | |
785 | rcu_read_lock(); | |
d2a079fd CYY |
786 | sta = sta_info_get(sdata, mgmt->sa); |
787 | if (!sta) { | |
788 | rcu_read_unlock(); | |
789 | return; | |
790 | } | |
791 | ||
792 | metric_txsta = airtime_link_metric_get(local, sta); | |
793 | ||
90a5e169 RP |
794 | mpath = mesh_path_lookup(orig_addr, sdata); |
795 | if (!mpath) { | |
796 | mesh_path_add(orig_addr, sdata); | |
797 | mpath = mesh_path_lookup(orig_addr, sdata); | |
798 | if (!mpath) { | |
799 | rcu_read_unlock(); | |
800 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
801 | return; | |
802 | } | |
90a5e169 | 803 | } |
5ee68e5b | 804 | |
7ebfa469 CYY |
805 | if (!(SN_LT(mpath->sn, orig_sn)) && |
806 | !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { | |
807 | rcu_read_unlock(); | |
808 | return; | |
809 | } | |
810 | ||
5ee68e5b | 811 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
812 | (time_after(jiffies, mpath->last_preq_to_root + |
813 | root_path_confirmation_jiffies(sdata)) || | |
814 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 815 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
816 | mhwmp_dbg(sdata, |
817 | "time to refresh root mpath %pM\n", | |
818 | orig_addr); | |
5ee68e5b | 819 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 820 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
821 | } |
822 | ||
7ebfa469 CYY |
823 | mpath->sn = orig_sn; |
824 | mpath->rann_metric = metric + metric_txsta; | |
825 | mpath->is_root = true; | |
826 | /* Recording RANNs sender address to send individually | |
827 | * addressed PREQs destined for root mesh STA */ | |
828 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
829 | ||
830 | if (root_is_gate) | |
831 | mesh_path_add_gate(mpath); | |
832 | ||
833 | if (ttl <= 1) { | |
834 | ifmsh->mshstats.dropped_frames_ttl++; | |
835 | rcu_read_unlock(); | |
836 | return; | |
837 | } | |
838 | ttl--; | |
839 | ||
840 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 841 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 842 | cpu_to_le32(orig_sn), |
15ff6365 | 843 | 0, NULL, 0, broadcast_addr, |
0507e159 | 844 | hopcount, ttl, cpu_to_le32(interval), |
d2a079fd | 845 | cpu_to_le32(metric + metric_txsta), |
90a5e169 | 846 | 0, sdata); |
90a5e169 | 847 | } |
3d045a54 | 848 | |
90a5e169 RP |
849 | rcu_read_unlock(); |
850 | } | |
050ac52c LCC |
851 | |
852 | ||
f698d856 | 853 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
854 | struct ieee80211_mgmt *mgmt, |
855 | size_t len) | |
856 | { | |
857 | struct ieee802_11_elems elems; | |
858 | size_t baselen; | |
859 | u32 last_hop_metric; | |
97091317 | 860 | struct sta_info *sta; |
050ac52c | 861 | |
9c80d3dc JB |
862 | /* need action_code */ |
863 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
864 | return; | |
865 | ||
97091317 JC |
866 | rcu_read_lock(); |
867 | sta = sta_info_get(sdata, mgmt->sa); | |
868 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
869 | rcu_read_unlock(); | |
870 | return; | |
871 | } | |
872 | rcu_read_unlock(); | |
873 | ||
050ac52c LCC |
874 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
875 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
876 | len - baselen, &elems); | |
877 | ||
dbb81c42 RP |
878 | if (elems.preq) { |
879 | if (elems.preq_len != 37) | |
050ac52c LCC |
880 | /* Right now we support just 1 destination and no AE */ |
881 | return; | |
dbb81c42 RP |
882 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
883 | MPATH_PREQ); | |
884 | if (last_hop_metric) | |
885 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
886 | last_hop_metric); | |
887 | } | |
888 | if (elems.prep) { | |
889 | if (elems.prep_len != 31) | |
050ac52c LCC |
890 | /* Right now we support no AE */ |
891 | return; | |
dbb81c42 RP |
892 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
893 | MPATH_PREP); | |
894 | if (last_hop_metric) | |
895 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
896 | last_hop_metric); | |
897 | } | |
898 | if (elems.perr) { | |
d611f062 | 899 | if (elems.perr_len != 15) |
050ac52c LCC |
900 | /* Right now we support only one destination per PERR */ |
901 | return; | |
f698d856 | 902 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 903 | } |
90a5e169 RP |
904 | if (elems.rann) |
905 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
906 | } |
907 | ||
908 | /** | |
909 | * mesh_queue_preq - queue a PREQ to a given destination | |
910 | * | |
911 | * @mpath: mesh path to discover | |
912 | * @flags: special attributes of the PREQ to be sent | |
913 | * | |
914 | * Locking: the function must be called from within a rcu read lock block. | |
915 | * | |
916 | */ | |
917 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
918 | { | |
f698d856 | 919 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 920 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
921 | struct mesh_preq_queue *preq_node; |
922 | ||
59615b5f | 923 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 924 | if (!preq_node) { |
bdcbd8e0 | 925 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
926 | return; |
927 | } | |
928 | ||
987dafad | 929 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 930 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 931 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
932 | kfree(preq_node); |
933 | if (printk_ratelimit()) | |
bdcbd8e0 | 934 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
935 | return; |
936 | } | |
937 | ||
f2dc7989 | 938 | spin_lock(&mpath->state_lock); |
f3011cf9 | 939 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 940 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 941 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 942 | kfree(preq_node); |
f3011cf9 JC |
943 | return; |
944 | } | |
945 | ||
050ac52c LCC |
946 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
947 | preq_node->flags = flags; | |
948 | ||
f3011cf9 | 949 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 950 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 951 | |
472dbc45 JB |
952 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
953 | ++ifmsh->preq_queue_len; | |
987dafad | 954 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 955 | |
472dbc45 | 956 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 957 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 958 | |
472dbc45 | 959 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
960 | /* avoid long wait if did not send preqs for a long time |
961 | * and jiffies wrapped around | |
962 | */ | |
472dbc45 | 963 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 964 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 965 | } else |
472dbc45 | 966 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
967 | min_preq_int_jiff(sdata)); |
968 | } | |
969 | ||
970 | /** | |
971 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
972 | * | |
f698d856 | 973 | * @sdata: local mesh subif |
050ac52c | 974 | */ |
f698d856 | 975 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 976 | { |
472dbc45 | 977 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
978 | struct mesh_preq_queue *preq_node; |
979 | struct mesh_path *mpath; | |
d19b3bf6 | 980 | u8 ttl, target_flags; |
3d045a54 | 981 | const u8 *da; |
050ac52c LCC |
982 | u32 lifetime; |
983 | ||
a43816df | 984 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
985 | if (!ifmsh->preq_queue_len || |
986 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 987 | min_preq_int_jiff(sdata))) { |
a43816df | 988 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
989 | return; |
990 | } | |
991 | ||
472dbc45 | 992 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
993 | struct mesh_preq_queue, list); |
994 | list_del(&preq_node->list); | |
472dbc45 | 995 | --ifmsh->preq_queue_len; |
a43816df | 996 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
997 | |
998 | rcu_read_lock(); | |
f698d856 | 999 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
1000 | if (!mpath) |
1001 | goto enddiscovery; | |
1002 | ||
1003 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 1004 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1005 | if (preq_node->flags & PREQ_Q_F_START) { |
1006 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1007 | spin_unlock_bh(&mpath->state_lock); | |
1008 | goto enddiscovery; | |
1009 | } else { | |
1010 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1011 | mpath->flags |= MESH_PATH_RESOLVING; | |
1012 | mpath->discovery_retries = 0; | |
1013 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1014 | } | |
1015 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1016 | mpath->flags & MESH_PATH_RESOLVED) { | |
1017 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1018 | spin_unlock_bh(&mpath->state_lock); | |
1019 | goto enddiscovery; | |
1020 | } | |
1021 | ||
472dbc45 | 1022 | ifmsh->last_preq = jiffies; |
050ac52c | 1023 | |
d19b3bf6 | 1024 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1025 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1026 | time_before(jiffies, ifmsh->last_sn_update)) { |
1027 | ++ifmsh->sn; | |
1028 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1029 | } |
1030 | lifetime = default_lifetime(sdata); | |
45904f21 | 1031 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1032 | if (ttl == 0) { |
472dbc45 | 1033 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1034 | spin_unlock_bh(&mpath->state_lock); |
1035 | goto enddiscovery; | |
1036 | } | |
1037 | ||
1038 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 1039 | target_flags = MP_F_DO; |
050ac52c | 1040 | else |
d19b3bf6 | 1041 | target_flags = MP_F_RF; |
050ac52c LCC |
1042 | |
1043 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1044 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
47846c9b | 1045 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 1046 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
3d045a54 | 1047 | cpu_to_le32(mpath->sn), da, 0, |
aa2b5928 | 1048 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 1049 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
1050 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1051 | ||
1052 | enddiscovery: | |
1053 | rcu_read_unlock(); | |
1054 | kfree(preq_node); | |
1055 | } | |
1056 | ||
2c53040f BH |
1057 | /** |
1058 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1059 | * |
e32f85f7 | 1060 | * @skb: 802.11 frame to be sent |
f698d856 | 1061 | * @sdata: network subif the frame will be sent through |
050ac52c | 1062 | * |
2c53040f BH |
1063 | * Lookup next hop for given skb and start path discovery if no |
1064 | * forwarding information is found. | |
1065 | * | |
0cfda851 TP |
1066 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1067 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1068 | */ |
0cfda851 TP |
1069 | int mesh_nexthop_resolve(struct sk_buff *skb, |
1070 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 1071 | { |
e32f85f7 | 1072 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1073 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1074 | struct mesh_path *mpath; | |
1075 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1076 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1077 | int err = 0; |
1078 | ||
1079 | rcu_read_lock(); | |
0cfda851 TP |
1080 | err = mesh_nexthop_lookup(skb, sdata); |
1081 | if (!err) | |
1082 | goto endlookup; | |
050ac52c | 1083 | |
0cfda851 TP |
1084 | /* no nexthop found, start resolving */ |
1085 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1086 | if (!mpath) { |
d19b3bf6 RP |
1087 | mesh_path_add(target_addr, sdata); |
1088 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1089 | if (!mpath) { |
0cfda851 | 1090 | mesh_path_discard_frame(skb, sdata); |
050ac52c LCC |
1091 | err = -ENOSPC; |
1092 | goto endlookup; | |
1093 | } | |
1094 | } | |
1095 | ||
0cfda851 TP |
1096 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1097 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1098 | ||
1099 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1100 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1101 | ||
1102 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1103 | ieee80211_set_qos_hdr(sdata, skb); | |
1104 | skb_queue_tail(&mpath->frame_queue, skb); | |
1105 | err = -ENOENT; | |
1106 | if (skb_to_free) | |
1107 | mesh_path_discard_frame(skb_to_free, sdata); | |
1108 | ||
1109 | endlookup: | |
1110 | rcu_read_unlock(); | |
1111 | return err; | |
1112 | } | |
1113 | /** | |
1114 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1115 | * this function is considered "using" the associated mpath, so preempt a path | |
1116 | * refresh if this mpath expires soon. | |
1117 | * | |
1118 | * @skb: 802.11 frame to be sent | |
1119 | * @sdata: network subif the frame will be sent through | |
1120 | * | |
1121 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1122 | */ | |
1123 | int mesh_nexthop_lookup(struct sk_buff *skb, | |
1124 | struct ieee80211_sub_if_data *sdata) | |
1125 | { | |
1126 | struct mesh_path *mpath; | |
1127 | struct sta_info *next_hop; | |
1128 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1129 | u8 *target_addr = hdr->addr3; | |
1130 | int err = -ENOENT; | |
050ac52c | 1131 | |
0cfda851 TP |
1132 | rcu_read_lock(); |
1133 | mpath = mesh_path_lookup(target_addr, sdata); | |
1134 | ||
1135 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1136 | goto endlookup; | |
1137 | ||
1138 | if (time_after(jiffies, | |
1139 | mpath->exp_time - | |
1140 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1141 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1142 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1143 | !(mpath->flags & MESH_PATH_FIXED)) | |
1144 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1145 | |
0cfda851 TP |
1146 | next_hop = rcu_dereference(mpath->next_hop); |
1147 | if (next_hop) { | |
1148 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1149 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1150 | err = 0; | |
050ac52c LCC |
1151 | } |
1152 | ||
1153 | endlookup: | |
1154 | rcu_read_unlock(); | |
1155 | return err; | |
1156 | } | |
1157 | ||
1158 | void mesh_path_timer(unsigned long data) | |
1159 | { | |
dea4096b JB |
1160 | struct mesh_path *mpath = (void *) data; |
1161 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1162 | int ret; |
5bb644a0 | 1163 | |
dea4096b | 1164 | if (sdata->local->quiescing) |
5bb644a0 | 1165 | return; |
5bb644a0 JB |
1166 | |
1167 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1168 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1169 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1170 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1171 | spin_unlock_bh(&mpath->state_lock); |
1172 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1173 | ++mpath->discovery_retries; |
1174 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1175 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1176 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1177 | mesh_queue_preq(mpath, 0); |
1178 | } else { | |
1179 | mpath->flags = 0; | |
1180 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1181 | spin_unlock_bh(&mpath->state_lock); |
1182 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1183 | ret = mesh_path_send_to_gates(mpath); | |
1184 | if (ret) | |
bdcbd8e0 | 1185 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1186 | } else |
1187 | mesh_path_flush_pending(mpath); | |
050ac52c | 1188 | } |
050ac52c | 1189 | } |
e304bfd3 RP |
1190 | |
1191 | void | |
1192 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1193 | { | |
1194 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1195 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1196 | u8 flags, target_flags = 0; |
e304bfd3 | 1197 | |
16dd7267 JC |
1198 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1199 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1200 | |
1201 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1202 | case IEEE80211_PROACTIVE_RANN: | |
1203 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1204 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1205 | 0, NULL, 0, broadcast_addr, |
a69cc44f | 1206 | 0, ifmsh->mshcfg.element_ttl, |
0507e159 | 1207 | cpu_to_le32(interval), 0, 0, sdata); |
a69cc44f CYY |
1208 | break; |
1209 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1210 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1211 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1212 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1213 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1214 | IEEE80211_PREQ_USN_FLAG; | |
1215 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
1216 | cpu_to_le32(++ifmsh->sn), target_flags, | |
1217 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1218 | 0, ifmsh->mshcfg.element_ttl, | |
1219 | cpu_to_le32(interval), | |
1220 | 0, cpu_to_le32(ifmsh->preq_id++), sdata); | |
1221 | break; | |
1222 | default: | |
bdcbd8e0 | 1223 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1224 | return; |
1225 | } | |
e304bfd3 | 1226 | } |