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> |
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 | ||
050ac52c LCC |
20 | #define MAX_PREQ_QUEUE_LEN 64 |
21 | ||
22 | /* Destination only */ | |
23 | #define MP_F_DO 0x1 | |
24 | /* Reply and forward */ | |
25 | #define MP_F_RF 0x2 | |
d611f062 RP |
26 | /* Unknown Sequence Number */ |
27 | #define MP_F_USN 0x01 | |
28 | /* Reason code Present */ | |
29 | #define MP_F_RCODE 0x02 | |
050ac52c | 30 | |
90a5e169 RP |
31 | static void mesh_queue_preq(struct mesh_path *, u8); |
32 | ||
4a3cb702 | 33 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
a00de5d0 LCC |
34 | { |
35 | if (ae) | |
36 | offset += 6; | |
ae7245cb | 37 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
38 | } |
39 | ||
aee6499c | 40 | static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
d611f062 RP |
41 | { |
42 | if (ae) | |
43 | offset += 6; | |
44 | return get_unaligned_le16(preq_elem + offset); | |
45 | } | |
46 | ||
050ac52c | 47 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
48 | #define AE_F (1<<6) |
49 | #define AE_F_SET(x) (*x & AE_F) | |
50 | #define PREQ_IE_FLAGS(x) (*(x)) | |
51 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
52 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
53 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
54 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
55 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
56 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
57 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
58 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
59 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 60 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
61 | |
62 | ||
63 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
64 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
65 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
66 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
67 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
68 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
69 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
70 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
71 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 72 | |
d611f062 | 73 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
74 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
75 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
76 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
77 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 78 | |
050ac52c | 79 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
80 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
81 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
050ac52c LCC |
82 | |
83 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 84 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 85 | #define default_lifetime(s) \ |
472dbc45 | 86 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 87 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
88 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
89 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 90 | #define disc_timeout_jiff(s) \ |
472dbc45 | 91 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
92 | #define root_path_confirmation_jiffies(s) \ |
93 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
94 | |
95 | enum mpath_frame_type { | |
96 | MPATH_PREQ = 0, | |
97 | MPATH_PREP, | |
90a5e169 RP |
98 | MPATH_PERR, |
99 | MPATH_RANN | |
050ac52c LCC |
100 | }; |
101 | ||
15ff6365 JB |
102 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
103 | ||
050ac52c | 104 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
f63f8421 | 105 | const u8 *orig_addr, u32 orig_sn, |
4a3cb702 | 106 | u8 target_flags, const u8 *target, |
f63f8421 | 107 | u32 target_sn, const u8 *da, |
4a3cb702 | 108 | u8 hop_count, u8 ttl, |
f63f8421 | 109 | u32 lifetime, u32 metric, u32 preq_id, |
4a3cb702 | 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: | |
0f71651f | 146 | mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
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 | 159 | return -ENOTSUPP; |
050ac52c LCC |
160 | } |
161 | *pos++ = ie_len; | |
162 | *pos++ = flags; | |
163 | *pos++ = hop_count; | |
164 | *pos++ = ttl; | |
25d49e4d TP |
165 | if (action == MPATH_PREP) { |
166 | memcpy(pos, target, ETH_ALEN); | |
167 | pos += ETH_ALEN; | |
f63f8421 | 168 | put_unaligned_le32(target_sn, pos); |
050ac52c | 169 | pos += 4; |
25d49e4d TP |
170 | } else { |
171 | if (action == MPATH_PREQ) { | |
f63f8421 | 172 | put_unaligned_le32(preq_id, pos); |
25d49e4d TP |
173 | pos += 4; |
174 | } | |
175 | memcpy(pos, orig_addr, ETH_ALEN); | |
176 | pos += ETH_ALEN; | |
f63f8421 | 177 | put_unaligned_le32(orig_sn, pos); |
90a5e169 RP |
178 | pos += 4; |
179 | } | |
f63f8421 | 180 | put_unaligned_le32(lifetime, pos); /* interval for RANN */ |
25d49e4d | 181 | pos += 4; |
f63f8421 | 182 | put_unaligned_le32(metric, pos); |
050ac52c LCC |
183 | pos += 4; |
184 | if (action == MPATH_PREQ) { | |
25d49e4d | 185 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 186 | *pos++ = target_flags; |
d19b3bf6 | 187 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 188 | pos += ETH_ALEN; |
f63f8421 | 189 | put_unaligned_le32(target_sn, pos); |
25d49e4d TP |
190 | pos += 4; |
191 | } else if (action == MPATH_PREP) { | |
192 | memcpy(pos, orig_addr, ETH_ALEN); | |
193 | pos += ETH_ALEN; | |
f63f8421 | 194 | put_unaligned_le32(orig_sn, pos); |
25d49e4d | 195 | pos += 4; |
90a5e169 | 196 | } |
050ac52c | 197 | |
62ae67be | 198 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
199 | return 0; |
200 | } | |
201 | ||
2cca397f JC |
202 | |
203 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
204 | * headroom in case the frame is encrypted. */ | |
205 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
206 | struct sk_buff *skb) | |
207 | { | |
2cca397f | 208 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
3f52b7e3 | 209 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
2cca397f JC |
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; | |
9cbbffe2 | 220 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
2154c81c | 221 | ieee80211_set_qos_hdr(sdata, skb); |
3f52b7e3 | 222 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
2cca397f JC |
223 | } |
224 | ||
050ac52c | 225 | /** |
75ea719c | 226 | * mesh_path_error_tx - Sends a PERR mesh management frame |
050ac52c | 227 | * |
75ea719c | 228 | * @ttl: allowed remaining hops |
d19b3bf6 RP |
229 | * @target: broken destination |
230 | * @target_sn: SN of the broken destination | |
231 | * @target_rcode: reason code for this PERR | |
050ac52c | 232 | * @ra: node this frame is addressed to |
75ea719c | 233 | * @sdata: local mesh subif |
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 | */ |
bf7cd94d | 239 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
f63f8421 CYY |
240 | u8 ttl, const u8 *target, u32 target_sn, |
241 | u16 target_rcode, const u8 *ra) | |
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 + |
2475b1cc | 255 | sdata->encrypt_headroom + |
8680451f | 256 | IEEE80211_ENCRYPT_TAILROOM + |
3b69a9c5 TP |
257 | hdr_len + |
258 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
259 | if (!skb) |
260 | return -1; | |
2475b1cc | 261 | skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); |
3b69a9c5 TP |
262 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
263 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
264 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
265 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
266 | |
267 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 268 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
269 | /* BSSID == SA */ |
270 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
271 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
272 | mgmt->u.action.u.mesh_action.action_code = | |
273 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 274 | ie_len = 15; |
050ac52c LCC |
275 | pos = skb_put(skb, 2 + ie_len); |
276 | *pos++ = WLAN_EID_PERR; | |
277 | *pos++ = ie_len; | |
d611f062 | 278 | /* ttl */ |
45904f21 | 279 | *pos++ = ttl; |
050ac52c LCC |
280 | /* number of destinations */ |
281 | *pos++ = 1; | |
d611f062 RP |
282 | /* |
283 | * flags bit, bit 1 is unset if we know the sequence number and | |
284 | * bit 2 is set if we have a reason code | |
285 | */ | |
286 | *pos = 0; | |
d19b3bf6 | 287 | if (!target_sn) |
d611f062 | 288 | *pos |= MP_F_USN; |
d19b3bf6 | 289 | if (target_rcode) |
d611f062 RP |
290 | *pos |= MP_F_RCODE; |
291 | pos++; | |
d19b3bf6 | 292 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 293 | pos += ETH_ALEN; |
f63f8421 | 294 | put_unaligned_le32(target_sn, pos); |
d611f062 | 295 | pos += 4; |
f63f8421 | 296 | put_unaligned_le16(target_rcode, pos); |
050ac52c | 297 | |
2cca397f JC |
298 | /* see note in function header */ |
299 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
300 | ifmsh->next_perr = TU_TO_EXP_TIME( |
301 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 302 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
303 | return 0; |
304 | } | |
305 | ||
bfc32e6a | 306 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 307 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
308 | { |
309 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
310 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
311 | int failed; | |
312 | ||
313 | if (!ieee80211_is_data(hdr->frame_control)) | |
314 | return; | |
315 | ||
316 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
317 | ||
318 | /* moving average, scaled to 100 */ | |
35b3fe1c JC |
319 | sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); |
320 | if (sta->fail_avg > 95) | |
321 | mesh_plink_broken(sta); | |
bfc32e6a JC |
322 | } |
323 | ||
050ac52c LCC |
324 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
325 | struct sta_info *sta) | |
326 | { | |
6b62bf32 | 327 | struct rate_info rinfo; |
050ac52c LCC |
328 | /* This should be adjusted for each device */ |
329 | int device_constant = 1 << ARITH_SHIFT; | |
330 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
331 | int s_unit = 1 << ARITH_SHIFT; | |
332 | int rate, err; | |
333 | u32 tx_time, estimated_retx; | |
334 | u64 result; | |
335 | ||
050ac52c LCC |
336 | if (sta->fail_avg >= 100) |
337 | return MAX_METRIC; | |
e6a9854b | 338 | |
6b62bf32 TP |
339 | sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); |
340 | rate = cfg80211_calculate_bitrate(&rinfo); | |
341 | if (WARN_ON(!rate)) | |
e6a9854b JB |
342 | return MAX_METRIC; |
343 | ||
050ac52c LCC |
344 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
345 | ||
346 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
347 | * 1Mbps. This will be corrected on tx_time computation. | |
348 | */ | |
050ac52c LCC |
349 | tx_time = (device_constant + 10 * test_frame_len / rate); |
350 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
351 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
352 | return (u32)result; | |
353 | } | |
354 | ||
355 | /** | |
356 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
357 | * | |
f698d856 | 358 | * @sdata: local mesh subif |
050ac52c LCC |
359 | * @mgmt: mesh management frame |
360 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 361 | * @action: type of hwmp ie |
050ac52c LCC |
362 | * |
363 | * This function updates the path routing information to the originator and the | |
f99288d1 | 364 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
365 | * |
366 | * Returns: metric to frame originator or 0 if the frame should not be further | |
367 | * processed | |
368 | * | |
369 | * Notes: this function is the only place (besides user-provided info) where | |
370 | * path routing information is updated. | |
371 | */ | |
f698d856 | 372 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
373 | struct ieee80211_mgmt *mgmt, |
374 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 375 | { |
f698d856 | 376 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
377 | struct mesh_path *mpath; |
378 | struct sta_info *sta; | |
379 | bool fresh_info; | |
4a3cb702 | 380 | const u8 *orig_addr, *ta; |
d19b3bf6 | 381 | u32 orig_sn, orig_metric; |
050ac52c LCC |
382 | unsigned long orig_lifetime, exp_time; |
383 | u32 last_hop_metric, new_metric; | |
384 | bool process = true; | |
050ac52c LCC |
385 | |
386 | rcu_read_lock(); | |
abe60632 | 387 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
388 | if (!sta) { |
389 | rcu_read_unlock(); | |
050ac52c | 390 | return 0; |
dc0b0f7d | 391 | } |
050ac52c LCC |
392 | |
393 | last_hop_metric = airtime_link_metric_get(local, sta); | |
394 | /* Update and check originator routing info */ | |
395 | fresh_info = true; | |
396 | ||
397 | switch (action) { | |
398 | case MPATH_PREQ: | |
399 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 400 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
401 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
402 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
403 | break; | |
404 | case MPATH_PREP: | |
3c26f1f6 TP |
405 | /* Originator here refers to the MP that was the target in the |
406 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
407 | * so that we can easily use a single function to gather path |
408 | * information from both PREQ and PREP frames. | |
409 | */ | |
3c26f1f6 TP |
410 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
411 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
412 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
413 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
414 | break; | |
415 | default: | |
dc0b0f7d | 416 | rcu_read_unlock(); |
050ac52c LCC |
417 | return 0; |
418 | } | |
419 | new_metric = orig_metric + last_hop_metric; | |
420 | if (new_metric < orig_metric) | |
421 | new_metric = MAX_METRIC; | |
422 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
423 | ||
b203ca39 | 424 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
425 | /* This MP is the originator, we are not interested in this |
426 | * frame, except for updating transmitter's path info. | |
427 | */ | |
428 | process = false; | |
429 | fresh_info = false; | |
430 | } else { | |
bf7cd94d | 431 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
432 | if (mpath) { |
433 | spin_lock_bh(&mpath->state_lock); | |
434 | if (mpath->flags & MESH_PATH_FIXED) | |
435 | fresh_info = false; | |
436 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
437 | (mpath->flags & MESH_PATH_SN_VALID)) { |
438 | if (SN_GT(mpath->sn, orig_sn) || | |
439 | (mpath->sn == orig_sn && | |
533866b1 | 440 | new_metric >= mpath->metric)) { |
050ac52c LCC |
441 | process = false; |
442 | fresh_info = false; | |
443 | } | |
444 | } | |
445 | } else { | |
ae76eef0 BC |
446 | mpath = mesh_path_add(sdata, orig_addr); |
447 | if (IS_ERR(mpath)) { | |
050ac52c | 448 | rcu_read_unlock(); |
050ac52c LCC |
449 | return 0; |
450 | } | |
451 | spin_lock_bh(&mpath->state_lock); | |
452 | } | |
453 | ||
454 | if (fresh_info) { | |
455 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 456 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 457 | mpath->metric = new_metric; |
d19b3bf6 | 458 | mpath->sn = orig_sn; |
050ac52c LCC |
459 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
460 | ? mpath->exp_time : exp_time; | |
461 | mesh_path_activate(mpath); | |
462 | spin_unlock_bh(&mpath->state_lock); | |
463 | mesh_path_tx_pending(mpath); | |
464 | /* draft says preq_id should be saved to, but there does | |
465 | * not seem to be any use for it, skipping by now | |
466 | */ | |
467 | } else | |
468 | spin_unlock_bh(&mpath->state_lock); | |
469 | } | |
470 | ||
471 | /* Update and check transmitter routing info */ | |
472 | ta = mgmt->sa; | |
b203ca39 | 473 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
474 | fresh_info = false; |
475 | else { | |
476 | fresh_info = true; | |
477 | ||
bf7cd94d | 478 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
479 | if (mpath) { |
480 | spin_lock_bh(&mpath->state_lock); | |
481 | if ((mpath->flags & MESH_PATH_FIXED) || | |
482 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
483 | (last_hop_metric > mpath->metric))) | |
484 | fresh_info = false; | |
485 | } else { | |
ae76eef0 BC |
486 | mpath = mesh_path_add(sdata, ta); |
487 | if (IS_ERR(mpath)) { | |
050ac52c | 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, |
4a3cb702 | 513 | const u8 *preq_elem, u32 metric) |
57ef5ddb | 514 | { |
472dbc45 | 515 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 516 | struct mesh_path *mpath = NULL; |
4a3cb702 | 517 | const u8 *target_addr, *orig_addr; |
3d045a54 | 518 | const u8 *da; |
3fbf4b71 CYY |
519 | u8 target_flags, ttl, flags; |
520 | u32 orig_sn, target_sn, lifetime, orig_metric; | |
050ac52c LCC |
521 | bool reply = false; |
522 | bool forward = true; | |
3fbf4b71 | 523 | bool root_is_gate; |
050ac52c | 524 | |
d19b3bf6 RP |
525 | /* Update target SN, if present */ |
526 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 527 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
528 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
529 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
530 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
531 | orig_metric = metric; |
532 | /* Proactive PREQ gate announcements */ | |
533 | flags = PREQ_IE_FLAGS(preq_elem); | |
534 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 535 | |
bdcbd8e0 | 536 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 537 | |
b203ca39 | 538 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 539 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
540 | forward = false; |
541 | reply = true; | |
542 | metric = 0; | |
d19b3bf6 | 543 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 544 | net_traversal_jiffies(sdata)) || |
d19b3bf6 | 545 | time_before(jiffies, ifmsh->last_sn_update)) { |
bc3ce0b0 | 546 | ++ifmsh->sn; |
d19b3bf6 | 547 | ifmsh->last_sn_update = jiffies; |
050ac52c | 548 | } |
bc3ce0b0 | 549 | target_sn = ifmsh->sn; |
3fbf4b71 CYY |
550 | } else if (is_broadcast_ether_addr(target_addr) && |
551 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
552 | rcu_read_lock(); | |
bf7cd94d | 553 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
554 | if (mpath) { |
555 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
556 | reply = true; | |
557 | target_addr = sdata->vif.addr; | |
558 | target_sn = ++ifmsh->sn; | |
559 | metric = 0; | |
560 | ifmsh->last_sn_update = jiffies; | |
561 | } | |
562 | if (root_is_gate) | |
563 | mesh_path_add_gate(mpath); | |
564 | } | |
565 | rcu_read_unlock(); | |
050ac52c LCC |
566 | } else { |
567 | rcu_read_lock(); | |
bf7cd94d | 568 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 569 | if (mpath) { |
d19b3bf6 RP |
570 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
571 | SN_LT(mpath->sn, target_sn)) { | |
572 | mpath->sn = target_sn; | |
573 | mpath->flags |= MESH_PATH_SN_VALID; | |
574 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
575 | (mpath->flags & MESH_PATH_ACTIVE)) { |
576 | reply = true; | |
577 | metric = mpath->metric; | |
d19b3bf6 RP |
578 | target_sn = mpath->sn; |
579 | if (target_flags & MP_F_RF) | |
580 | target_flags |= MP_F_DO; | |
050ac52c LCC |
581 | else |
582 | forward = false; | |
583 | } | |
584 | } | |
585 | rcu_read_unlock(); | |
586 | } | |
587 | ||
588 | if (reply) { | |
589 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 590 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 591 | if (ttl != 0) { |
bdcbd8e0 | 592 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 | 593 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
f63f8421 CYY |
594 | orig_sn, 0, target_addr, |
595 | target_sn, mgmt->sa, 0, ttl, | |
596 | lifetime, metric, 0, sdata); | |
3fbf4b71 | 597 | } else { |
472dbc45 | 598 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 599 | } |
050ac52c LCC |
600 | } |
601 | ||
94f90656 | 602 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 603 | u32 preq_id; |
3fbf4b71 | 604 | u8 hopcount; |
050ac52c LCC |
605 | |
606 | ttl = PREQ_IE_TTL(preq_elem); | |
607 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
608 | if (ttl <= 1) { | |
472dbc45 | 609 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
610 | return; |
611 | } | |
bdcbd8e0 | 612 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 613 | --ttl; |
050ac52c LCC |
614 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
615 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
616 | da = (mpath && mpath->is_root) ? |
617 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
618 | |
619 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
620 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
621 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
622 | metric = orig_metric; | |
623 | } | |
624 | ||
050ac52c | 625 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
f63f8421 CYY |
626 | orig_sn, target_flags, target_addr, |
627 | target_sn, da, hopcount, ttl, lifetime, | |
628 | metric, preq_id, sdata); | |
7d4e15b1 CYY |
629 | if (!is_multicast_ether_addr(da)) |
630 | ifmsh->mshstats.fwded_unicast++; | |
631 | else | |
632 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 633 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
634 | } |
635 | } | |
636 | ||
637 | ||
40b275b6 JB |
638 | static inline struct sta_info * |
639 | next_hop_deref_protected(struct mesh_path *mpath) | |
640 | { | |
641 | return rcu_dereference_protected(mpath->next_hop, | |
642 | lockdep_is_held(&mpath->state_lock)); | |
643 | } | |
644 | ||
645 | ||
f698d856 | 646 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 647 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 648 | const u8 *prep_elem, u32 metric) |
050ac52c | 649 | { |
d665508b | 650 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 651 | struct mesh_path *mpath; |
4a3cb702 | 652 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
653 | u8 ttl, hopcount, flags; |
654 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 655 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 656 | |
bdcbd8e0 | 657 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 658 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 659 | |
3c26f1f6 | 660 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 661 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
662 | /* destination, no forwarding required */ |
663 | return; | |
664 | ||
d665508b CYY |
665 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
666 | return; | |
667 | ||
050ac52c LCC |
668 | ttl = PREP_IE_TTL(prep_elem); |
669 | if (ttl <= 1) { | |
472dbc45 | 670 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
671 | return; |
672 | } | |
673 | ||
674 | rcu_read_lock(); | |
bf7cd94d | 675 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
676 | if (mpath) |
677 | spin_lock_bh(&mpath->state_lock); | |
678 | else | |
679 | goto fail; | |
680 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
681 | spin_unlock_bh(&mpath->state_lock); | |
682 | goto fail; | |
683 | } | |
40b275b6 | 684 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
685 | spin_unlock_bh(&mpath->state_lock); |
686 | --ttl; | |
687 | flags = PREP_IE_FLAGS(prep_elem); | |
688 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
689 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 690 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
691 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
692 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c | 693 | |
f63f8421 CYY |
694 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
695 | target_addr, target_sn, next_hop, hopcount, | |
696 | ttl, lifetime, metric, 0, sdata); | |
050ac52c | 697 | rcu_read_unlock(); |
c8a61a7d DW |
698 | |
699 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 700 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
701 | return; |
702 | ||
703 | fail: | |
704 | rcu_read_unlock(); | |
472dbc45 | 705 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
706 | } |
707 | ||
f698d856 | 708 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
709 | struct ieee80211_mgmt *mgmt, |
710 | const u8 *perr_elem) | |
050ac52c | 711 | { |
d611f062 | 712 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 713 | struct mesh_path *mpath; |
d611f062 | 714 | u8 ttl; |
4a3cb702 | 715 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
716 | u32 target_sn; |
717 | u16 target_rcode; | |
050ac52c LCC |
718 | |
719 | ta = mgmt->sa; | |
d611f062 RP |
720 | ttl = PERR_IE_TTL(perr_elem); |
721 | if (ttl <= 1) { | |
722 | ifmsh->mshstats.dropped_frames_ttl++; | |
723 | return; | |
724 | } | |
725 | ttl--; | |
d19b3bf6 RP |
726 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
727 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
728 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 729 | |
050ac52c | 730 | rcu_read_lock(); |
bf7cd94d | 731 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 732 | if (mpath) { |
888d04df FF |
733 | struct sta_info *sta; |
734 | ||
050ac52c | 735 | spin_lock_bh(&mpath->state_lock); |
888d04df | 736 | sta = next_hop_deref_protected(mpath); |
050ac52c | 737 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 738 | ether_addr_equal(ta, sta->sta.addr) && |
d19b3bf6 RP |
739 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
740 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 741 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 742 | mpath->sn = target_sn; |
050ac52c | 743 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
744 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
745 | goto endperr; | |
bf7cd94d | 746 | mesh_path_error_tx(sdata, ttl, target_addr, |
f63f8421 | 747 | target_sn, target_rcode, |
bf7cd94d | 748 | broadcast_addr); |
050ac52c LCC |
749 | } else |
750 | spin_unlock_bh(&mpath->state_lock); | |
751 | } | |
d665508b | 752 | endperr: |
050ac52c LCC |
753 | rcu_read_unlock(); |
754 | } | |
755 | ||
90a5e169 | 756 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
757 | struct ieee80211_mgmt *mgmt, |
758 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
759 | { |
760 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
761 | struct ieee80211_local *local = sdata->local; |
762 | struct sta_info *sta; | |
90a5e169 | 763 | struct mesh_path *mpath; |
90a5e169 | 764 | u8 ttl, flags, hopcount; |
4a3cb702 | 765 | const u8 *orig_addr; |
d2a079fd | 766 | u32 orig_sn, metric, metric_txsta, interval; |
5ee68e5b | 767 | bool root_is_gate; |
90a5e169 | 768 | |
90a5e169 | 769 | ttl = rann->rann_ttl; |
90a5e169 | 770 | flags = rann->rann_flags; |
5ee68e5b | 771 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 772 | orig_addr = rann->rann_addr; |
292c41ac | 773 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 774 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 775 | hopcount = rann->rann_hopcount; |
a6a58b4f | 776 | hopcount++; |
292c41ac | 777 | metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
778 | |
779 | /* Ignore our own RANNs */ | |
b203ca39 | 780 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
781 | return; |
782 | ||
bdcbd8e0 JB |
783 | mhwmp_dbg(sdata, |
784 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
785 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
786 | |
787 | rcu_read_lock(); | |
d2a079fd CYY |
788 | sta = sta_info_get(sdata, mgmt->sa); |
789 | if (!sta) { | |
790 | rcu_read_unlock(); | |
791 | return; | |
792 | } | |
793 | ||
794 | metric_txsta = airtime_link_metric_get(local, sta); | |
795 | ||
bf7cd94d | 796 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 797 | if (!mpath) { |
ae76eef0 BC |
798 | mpath = mesh_path_add(sdata, orig_addr); |
799 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
800 | rcu_read_unlock(); |
801 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
802 | return; | |
803 | } | |
90a5e169 | 804 | } |
5ee68e5b | 805 | |
7ebfa469 CYY |
806 | if (!(SN_LT(mpath->sn, orig_sn)) && |
807 | !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { | |
808 | rcu_read_unlock(); | |
809 | return; | |
810 | } | |
811 | ||
5ee68e5b | 812 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
813 | (time_after(jiffies, mpath->last_preq_to_root + |
814 | root_path_confirmation_jiffies(sdata)) || | |
815 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 816 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
817 | mhwmp_dbg(sdata, |
818 | "time to refresh root mpath %pM\n", | |
819 | orig_addr); | |
5ee68e5b | 820 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 821 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
822 | } |
823 | ||
7ebfa469 CYY |
824 | mpath->sn = orig_sn; |
825 | mpath->rann_metric = metric + metric_txsta; | |
826 | mpath->is_root = true; | |
827 | /* Recording RANNs sender address to send individually | |
828 | * addressed PREQs destined for root mesh STA */ | |
829 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
830 | ||
831 | if (root_is_gate) | |
832 | mesh_path_add_gate(mpath); | |
833 | ||
834 | if (ttl <= 1) { | |
835 | ifmsh->mshstats.dropped_frames_ttl++; | |
836 | rcu_read_unlock(); | |
837 | return; | |
838 | } | |
839 | ttl--; | |
840 | ||
841 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 842 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
f63f8421 CYY |
843 | orig_sn, 0, NULL, 0, broadcast_addr, |
844 | hopcount, ttl, interval, | |
845 | metric + metric_txsta, 0, sdata); | |
90a5e169 | 846 | } |
3d045a54 | 847 | |
90a5e169 RP |
848 | rcu_read_unlock(); |
849 | } | |
050ac52c LCC |
850 | |
851 | ||
f698d856 | 852 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 853 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c LCC |
854 | { |
855 | struct ieee802_11_elems elems; | |
856 | size_t baselen; | |
857 | u32 last_hop_metric; | |
97091317 | 858 | struct sta_info *sta; |
050ac52c | 859 | |
9c80d3dc JB |
860 | /* need action_code */ |
861 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
862 | return; | |
863 | ||
97091317 JC |
864 | rcu_read_lock(); |
865 | sta = sta_info_get(sdata, mgmt->sa); | |
866 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
867 | rcu_read_unlock(); | |
868 | return; | |
869 | } | |
870 | rcu_read_unlock(); | |
871 | ||
050ac52c LCC |
872 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
873 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
b2e506bf | 874 | len - baselen, false, &elems); |
050ac52c | 875 | |
dbb81c42 RP |
876 | if (elems.preq) { |
877 | if (elems.preq_len != 37) | |
050ac52c LCC |
878 | /* Right now we support just 1 destination and no AE */ |
879 | return; | |
dbb81c42 RP |
880 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
881 | MPATH_PREQ); | |
882 | if (last_hop_metric) | |
883 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
884 | last_hop_metric); | |
885 | } | |
886 | if (elems.prep) { | |
887 | if (elems.prep_len != 31) | |
050ac52c LCC |
888 | /* Right now we support no AE */ |
889 | return; | |
dbb81c42 RP |
890 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
891 | MPATH_PREP); | |
892 | if (last_hop_metric) | |
893 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
894 | last_hop_metric); | |
895 | } | |
896 | if (elems.perr) { | |
d611f062 | 897 | if (elems.perr_len != 15) |
050ac52c LCC |
898 | /* Right now we support only one destination per PERR */ |
899 | return; | |
f698d856 | 900 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 901 | } |
90a5e169 RP |
902 | if (elems.rann) |
903 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
904 | } |
905 | ||
906 | /** | |
907 | * mesh_queue_preq - queue a PREQ to a given destination | |
908 | * | |
909 | * @mpath: mesh path to discover | |
910 | * @flags: special attributes of the PREQ to be sent | |
911 | * | |
912 | * Locking: the function must be called from within a rcu read lock block. | |
913 | * | |
914 | */ | |
915 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
916 | { | |
f698d856 | 917 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 918 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
919 | struct mesh_preq_queue *preq_node; |
920 | ||
59615b5f | 921 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 922 | if (!preq_node) { |
bdcbd8e0 | 923 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
924 | return; |
925 | } | |
926 | ||
987dafad | 927 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 928 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 929 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
930 | kfree(preq_node); |
931 | if (printk_ratelimit()) | |
bdcbd8e0 | 932 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
933 | return; |
934 | } | |
935 | ||
f2dc7989 | 936 | spin_lock(&mpath->state_lock); |
f3011cf9 | 937 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 938 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 939 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 940 | kfree(preq_node); |
f3011cf9 JC |
941 | return; |
942 | } | |
943 | ||
050ac52c LCC |
944 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
945 | preq_node->flags = flags; | |
946 | ||
f3011cf9 | 947 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 948 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 949 | |
472dbc45 JB |
950 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
951 | ++ifmsh->preq_queue_len; | |
987dafad | 952 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 953 | |
472dbc45 | 954 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 955 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 956 | |
472dbc45 | 957 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
958 | /* avoid long wait if did not send preqs for a long time |
959 | * and jiffies wrapped around | |
960 | */ | |
472dbc45 | 961 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 962 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 963 | } else |
472dbc45 | 964 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
965 | min_preq_int_jiff(sdata)); |
966 | } | |
967 | ||
968 | /** | |
969 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
970 | * | |
f698d856 | 971 | * @sdata: local mesh subif |
050ac52c | 972 | */ |
f698d856 | 973 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 974 | { |
472dbc45 | 975 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
976 | struct mesh_preq_queue *preq_node; |
977 | struct mesh_path *mpath; | |
d19b3bf6 | 978 | u8 ttl, target_flags; |
3d045a54 | 979 | const u8 *da; |
050ac52c LCC |
980 | u32 lifetime; |
981 | ||
a43816df | 982 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
983 | if (!ifmsh->preq_queue_len || |
984 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 985 | min_preq_int_jiff(sdata))) { |
a43816df | 986 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
987 | return; |
988 | } | |
989 | ||
472dbc45 | 990 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
991 | struct mesh_preq_queue, list); |
992 | list_del(&preq_node->list); | |
472dbc45 | 993 | --ifmsh->preq_queue_len; |
a43816df | 994 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
995 | |
996 | rcu_read_lock(); | |
bf7cd94d | 997 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
998 | if (!mpath) |
999 | goto enddiscovery; | |
1000 | ||
1001 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 1002 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1003 | if (preq_node->flags & PREQ_Q_F_START) { |
1004 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1005 | spin_unlock_bh(&mpath->state_lock); | |
1006 | goto enddiscovery; | |
1007 | } else { | |
1008 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1009 | mpath->flags |= MESH_PATH_RESOLVING; | |
1010 | mpath->discovery_retries = 0; | |
1011 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1012 | } | |
1013 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1014 | mpath->flags & MESH_PATH_RESOLVED) { | |
1015 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1016 | spin_unlock_bh(&mpath->state_lock); | |
1017 | goto enddiscovery; | |
1018 | } | |
1019 | ||
472dbc45 | 1020 | ifmsh->last_preq = jiffies; |
050ac52c | 1021 | |
d19b3bf6 | 1022 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1023 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1024 | time_before(jiffies, ifmsh->last_sn_update)) { |
1025 | ++ifmsh->sn; | |
1026 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1027 | } |
1028 | lifetime = default_lifetime(sdata); | |
45904f21 | 1029 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1030 | if (ttl == 0) { |
472dbc45 | 1031 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1032 | spin_unlock_bh(&mpath->state_lock); |
1033 | goto enddiscovery; | |
1034 | } | |
1035 | ||
1036 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 1037 | target_flags = MP_F_DO; |
050ac52c | 1038 | else |
d19b3bf6 | 1039 | target_flags = MP_F_RF; |
050ac52c LCC |
1040 | |
1041 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1042 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
f63f8421 CYY |
1043 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
1044 | target_flags, mpath->dst, mpath->sn, da, 0, | |
1045 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); | |
050ac52c LCC |
1046 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1047 | ||
1048 | enddiscovery: | |
1049 | rcu_read_unlock(); | |
1050 | kfree(preq_node); | |
1051 | } | |
1052 | ||
2c53040f BH |
1053 | /** |
1054 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1055 | * |
e32f85f7 | 1056 | * @skb: 802.11 frame to be sent |
f698d856 | 1057 | * @sdata: network subif the frame will be sent through |
050ac52c | 1058 | * |
2c53040f BH |
1059 | * Lookup next hop for given skb and start path discovery if no |
1060 | * forwarding information is found. | |
1061 | * | |
0cfda851 TP |
1062 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1063 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1064 | */ |
bf7cd94d JB |
1065 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1066 | struct sk_buff *skb) | |
050ac52c | 1067 | { |
e32f85f7 | 1068 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1069 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1070 | struct mesh_path *mpath; | |
1071 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1072 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1073 | int err = 0; |
1074 | ||
3f52b7e3 MP |
1075 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1076 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1077 | return 0; | |
1078 | ||
050ac52c | 1079 | rcu_read_lock(); |
bf7cd94d | 1080 | err = mesh_nexthop_lookup(sdata, skb); |
0cfda851 TP |
1081 | if (!err) |
1082 | goto endlookup; | |
050ac52c | 1083 | |
0cfda851 | 1084 | /* no nexthop found, start resolving */ |
bf7cd94d | 1085 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1086 | if (!mpath) { |
ae76eef0 BC |
1087 | mpath = mesh_path_add(sdata, target_addr); |
1088 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1089 | mesh_path_discard_frame(sdata, skb); |
ae76eef0 | 1090 | err = PTR_ERR(mpath); |
050ac52c LCC |
1091 | goto endlookup; |
1092 | } | |
1093 | } | |
1094 | ||
0cfda851 TP |
1095 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1096 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1097 | ||
1098 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1099 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1100 | ||
1101 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1102 | ieee80211_set_qos_hdr(sdata, skb); | |
1103 | skb_queue_tail(&mpath->frame_queue, skb); | |
1104 | err = -ENOENT; | |
1105 | if (skb_to_free) | |
bf7cd94d | 1106 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 TP |
1107 | |
1108 | endlookup: | |
1109 | rcu_read_unlock(); | |
1110 | return err; | |
1111 | } | |
bf7cd94d | 1112 | |
0cfda851 TP |
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 | */ | |
bf7cd94d JB |
1123 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1124 | struct sk_buff *skb) | |
0cfda851 TP |
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 | 1132 | rcu_read_lock(); |
bf7cd94d | 1133 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 TP |
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); | |
3f52b7e3 | 1150 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
0cfda851 | 1151 | err = 0; |
050ac52c LCC |
1152 | } |
1153 | ||
1154 | endlookup: | |
1155 | rcu_read_unlock(); | |
1156 | return err; | |
1157 | } | |
1158 | ||
1159 | void mesh_path_timer(unsigned long data) | |
1160 | { | |
dea4096b JB |
1161 | struct mesh_path *mpath = (void *) data; |
1162 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1163 | int ret; |
5bb644a0 | 1164 | |
dea4096b | 1165 | if (sdata->local->quiescing) |
5bb644a0 | 1166 | return; |
5bb644a0 JB |
1167 | |
1168 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1169 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1170 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1171 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1172 | spin_unlock_bh(&mpath->state_lock); |
1173 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1174 | ++mpath->discovery_retries; |
1175 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1176 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1177 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1178 | mesh_queue_preq(mpath, 0); |
1179 | } else { | |
1180 | mpath->flags = 0; | |
1181 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1182 | spin_unlock_bh(&mpath->state_lock); |
1183 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1184 | ret = mesh_path_send_to_gates(mpath); | |
1185 | if (ret) | |
bdcbd8e0 | 1186 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1187 | } else |
1188 | mesh_path_flush_pending(mpath); | |
050ac52c | 1189 | } |
050ac52c | 1190 | } |
e304bfd3 | 1191 | |
bf7cd94d | 1192 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
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, | |
f63f8421 CYY |
1204 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
1205 | 0, ifmsh->mshcfg.element_ttl, | |
1206 | interval, 0, 0, sdata); | |
a69cc44f CYY |
1207 | break; |
1208 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1209 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1210 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1211 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1212 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1213 | IEEE80211_PREQ_USN_FLAG; | |
1214 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
f63f8421 CYY |
1215 | ++ifmsh->sn, target_flags, |
1216 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1217 | 0, ifmsh->mshcfg.element_ttl, interval, | |
1218 | 0, ifmsh->preq_id++, sdata); | |
a69cc44f CYY |
1219 | break; |
1220 | default: | |
bdcbd8e0 | 1221 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1222 | return; |
1223 | } | |
e304bfd3 | 1224 | } |