Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
050ac52c | 2 | /* |
264d9b7d | 3 | * Copyright (c) 2008, 2009 open80211s Ltd. |
4abb52a4 | 4 | * Copyright (C) 2019 Intel Corporation |
050ac52c | 5 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
050ac52c LCC |
6 | */ |
7 | ||
5a0e3ad6 | 8 | #include <linux/slab.h> |
888d04df | 9 | #include <linux/etherdevice.h> |
d26ad377 | 10 | #include <asm/unaligned.h> |
2cca397f | 11 | #include "wme.h" |
050ac52c LCC |
12 | #include "mesh.h" |
13 | ||
050ac52c LCC |
14 | #define TEST_FRAME_LEN 8192 |
15 | #define MAX_METRIC 0xffffffff | |
16 | #define ARITH_SHIFT 8 | |
fe56c9c1 | 17 | #define LINK_FAIL_THRESH 95 |
050ac52c | 18 | |
050ac52c LCC |
19 | #define MAX_PREQ_QUEUE_LEN 64 |
20 | ||
90a5e169 RP |
21 | static void mesh_queue_preq(struct mesh_path *, u8); |
22 | ||
4a3cb702 | 23 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
a00de5d0 LCC |
24 | { |
25 | if (ae) | |
26 | offset += 6; | |
ae7245cb | 27 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
28 | } |
29 | ||
aee6499c | 30 | static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
d611f062 RP |
31 | { |
32 | if (ae) | |
33 | offset += 6; | |
34 | return get_unaligned_le16(preq_elem + offset); | |
35 | } | |
36 | ||
050ac52c | 37 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
38 | #define AE_F (1<<6) |
39 | #define AE_F_SET(x) (*x & AE_F) | |
40 | #define PREQ_IE_FLAGS(x) (*(x)) | |
41 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
42 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
43 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
44 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
45 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
46 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
47 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
48 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
49 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 50 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
51 | |
52 | ||
53 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
54 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
55 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
56 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
57 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
58 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
59 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
60 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
61 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 62 | |
d611f062 | 63 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
64 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
65 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
66 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
67 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 68 | |
050ac52c | 69 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
70 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
71 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
d8f0300a JJ |
72 | #define MAX_SANE_SN_DELTA 32 |
73 | ||
74 | static inline u32 SN_DELTA(u32 x, u32 y) | |
75 | { | |
76 | return x >= y ? x - y : y - x; | |
77 | } | |
050ac52c LCC |
78 | |
79 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 80 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 81 | #define default_lifetime(s) \ |
472dbc45 | 82 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 83 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
84 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
85 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 86 | #define disc_timeout_jiff(s) \ |
472dbc45 | 87 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
88 | #define root_path_confirmation_jiffies(s) \ |
89 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
90 | |
91 | enum mpath_frame_type { | |
92 | MPATH_PREQ = 0, | |
93 | MPATH_PREP, | |
90a5e169 RP |
94 | MPATH_PERR, |
95 | MPATH_RANN | |
050ac52c LCC |
96 | }; |
97 | ||
15ff6365 JB |
98 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
99 | ||
050ac52c | 100 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
f63f8421 | 101 | const u8 *orig_addr, u32 orig_sn, |
4a3cb702 | 102 | u8 target_flags, const u8 *target, |
f63f8421 | 103 | u32 target_sn, const u8 *da, |
4a3cb702 | 104 | u8 hop_count, u8 ttl, |
f63f8421 | 105 | u32 lifetime, u32 metric, u32 preq_id, |
4a3cb702 | 106 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 107 | { |
f698d856 | 108 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 109 | struct sk_buff *skb; |
050ac52c | 110 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 | 111 | u8 *pos, ie_len; |
4c121fd6 JB |
112 | int hdr_len = offsetofend(struct ieee80211_mgmt, |
113 | u.action.u.mesh_action); | |
050ac52c | 114 | |
65e8b0cc | 115 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
116 | hdr_len + |
117 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
118 | if (!skb) |
119 | return -1; | |
65e8b0cc | 120 | skb_reserve(skb, local->tx_headroom); |
b080db58 | 121 | mgmt = skb_put_zero(skb, hdr_len); |
e7827a70 HH |
122 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
123 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
124 | |
125 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 126 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 127 | /* BSSID == SA */ |
47846c9b | 128 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
129 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
130 | mgmt->u.action.u.mesh_action.action_code = | |
131 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
132 | |
133 | switch (action) { | |
134 | case MPATH_PREQ: | |
bdcbd8e0 | 135 | mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); |
050ac52c LCC |
136 | ie_len = 37; |
137 | pos = skb_put(skb, 2 + ie_len); | |
138 | *pos++ = WLAN_EID_PREQ; | |
139 | break; | |
140 | case MPATH_PREP: | |
0f71651f | 141 | mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
050ac52c LCC |
142 | ie_len = 31; |
143 | pos = skb_put(skb, 2 + ie_len); | |
144 | *pos++ = WLAN_EID_PREP; | |
145 | break; | |
90a5e169 | 146 | case MPATH_RANN: |
bdcbd8e0 | 147 | mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
90a5e169 RP |
148 | ie_len = sizeof(struct ieee80211_rann_ie); |
149 | pos = skb_put(skb, 2 + ie_len); | |
150 | *pos++ = WLAN_EID_RANN; | |
151 | break; | |
050ac52c | 152 | default: |
812714d7 | 153 | kfree_skb(skb); |
050ac52c | 154 | return -ENOTSUPP; |
050ac52c LCC |
155 | } |
156 | *pos++ = ie_len; | |
157 | *pos++ = flags; | |
158 | *pos++ = hop_count; | |
159 | *pos++ = ttl; | |
25d49e4d TP |
160 | if (action == MPATH_PREP) { |
161 | memcpy(pos, target, ETH_ALEN); | |
162 | pos += ETH_ALEN; | |
f63f8421 | 163 | put_unaligned_le32(target_sn, pos); |
050ac52c | 164 | pos += 4; |
25d49e4d TP |
165 | } else { |
166 | if (action == MPATH_PREQ) { | |
f63f8421 | 167 | put_unaligned_le32(preq_id, pos); |
25d49e4d TP |
168 | pos += 4; |
169 | } | |
170 | memcpy(pos, orig_addr, ETH_ALEN); | |
171 | pos += ETH_ALEN; | |
f63f8421 | 172 | put_unaligned_le32(orig_sn, pos); |
90a5e169 RP |
173 | pos += 4; |
174 | } | |
f63f8421 | 175 | put_unaligned_le32(lifetime, pos); /* interval for RANN */ |
25d49e4d | 176 | pos += 4; |
f63f8421 | 177 | put_unaligned_le32(metric, pos); |
050ac52c LCC |
178 | pos += 4; |
179 | if (action == MPATH_PREQ) { | |
25d49e4d | 180 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 181 | *pos++ = target_flags; |
d19b3bf6 | 182 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 183 | pos += ETH_ALEN; |
f63f8421 | 184 | put_unaligned_le32(target_sn, pos); |
25d49e4d TP |
185 | pos += 4; |
186 | } else if (action == MPATH_PREP) { | |
187 | memcpy(pos, orig_addr, ETH_ALEN); | |
188 | pos += ETH_ALEN; | |
f63f8421 | 189 | put_unaligned_le32(orig_sn, pos); |
25d49e4d | 190 | pos += 4; |
90a5e169 | 191 | } |
050ac52c | 192 | |
62ae67be | 193 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
194 | return 0; |
195 | } | |
196 | ||
2cca397f JC |
197 | |
198 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
199 | * headroom in case the frame is encrypted. */ | |
200 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
201 | struct sk_buff *skb) | |
202 | { | |
2cca397f | 203 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
3f52b7e3 | 204 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
2cca397f | 205 | |
d57a544d ZS |
206 | skb_reset_mac_header(skb); |
207 | skb_reset_network_header(skb); | |
208 | skb_reset_transport_header(skb); | |
2cca397f JC |
209 | |
210 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
211 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
212 | skb->priority = 7; | |
213 | ||
214 | info->control.vif = &sdata->vif; | |
cc20ff2c | 215 | info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
2154c81c | 216 | ieee80211_set_qos_hdr(sdata, skb); |
3f52b7e3 | 217 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
2cca397f JC |
218 | } |
219 | ||
050ac52c | 220 | /** |
75ea719c | 221 | * mesh_path_error_tx - Sends a PERR mesh management frame |
050ac52c | 222 | * |
75ea719c | 223 | * @ttl: allowed remaining hops |
d19b3bf6 RP |
224 | * @target: broken destination |
225 | * @target_sn: SN of the broken destination | |
226 | * @target_rcode: reason code for this PERR | |
050ac52c | 227 | * @ra: node this frame is addressed to |
75ea719c | 228 | * @sdata: local mesh subif |
2cca397f JC |
229 | * |
230 | * Note: This function may be called with driver locks taken that the driver | |
231 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
232 | * frame directly but add it to the pending queue instead. | |
050ac52c | 233 | */ |
bf7cd94d | 234 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
f63f8421 CYY |
235 | u8 ttl, const u8 *target, u32 target_sn, |
236 | u16 target_rcode, const u8 *ra) | |
050ac52c | 237 | { |
f698d856 | 238 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 239 | struct sk_buff *skb; |
dca7e943 | 240 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 241 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 | 242 | u8 *pos, ie_len; |
4c121fd6 JB |
243 | int hdr_len = offsetofend(struct ieee80211_mgmt, |
244 | u.action.u.mesh_action); | |
050ac52c | 245 | |
dca7e943 TP |
246 | if (time_before(jiffies, ifmsh->next_perr)) |
247 | return -EAGAIN; | |
248 | ||
65e8b0cc | 249 | skb = dev_alloc_skb(local->tx_headroom + |
2475b1cc | 250 | sdata->encrypt_headroom + |
8680451f | 251 | IEEE80211_ENCRYPT_TAILROOM + |
3b69a9c5 TP |
252 | hdr_len + |
253 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
254 | if (!skb) |
255 | return -1; | |
2475b1cc | 256 | skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); |
b080db58 | 257 | mgmt = skb_put_zero(skb, 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; | |
932e628d CYY |
276 | /* Flags field has AE bit only as defined in |
277 | * sec 8.4.2.117 IEEE802.11-2012 | |
d611f062 RP |
278 | */ |
279 | *pos = 0; | |
d611f062 | 280 | pos++; |
d19b3bf6 | 281 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 282 | pos += ETH_ALEN; |
f63f8421 | 283 | put_unaligned_le32(target_sn, pos); |
d611f062 | 284 | pos += 4; |
f63f8421 | 285 | put_unaligned_le16(target_rcode, pos); |
050ac52c | 286 | |
2cca397f JC |
287 | /* see note in function header */ |
288 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
289 | ifmsh->next_perr = TU_TO_EXP_TIME( |
290 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 291 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
292 | return 0; |
293 | } | |
294 | ||
bfc32e6a | 295 | void ieee80211s_update_metric(struct ieee80211_local *local, |
c4205510 YCP |
296 | struct sta_info *sta, |
297 | struct ieee80211_tx_status *st) | |
bfc32e6a | 298 | { |
c4205510 | 299 | struct ieee80211_tx_info *txinfo = st->info; |
bfc32e6a | 300 | int failed; |
67fc0554 | 301 | struct rate_info rinfo; |
bfc32e6a | 302 | |
bfc32e6a JC |
303 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); |
304 | ||
3eb0928f MR |
305 | /* moving average, scaled to 100. |
306 | * feed failure as 100 and success as 0 | |
307 | */ | |
308 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100); | |
fe56c9c1 MR |
309 | if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) > |
310 | LINK_FAIL_THRESH) | |
35b3fe1c | 311 | mesh_plink_broken(sta); |
67fc0554 JH |
312 | |
313 | sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo); | |
314 | ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg, | |
315 | cfg80211_calculate_bitrate(&rinfo)); | |
bfc32e6a JC |
316 | } |
317 | ||
ab60633c NM |
318 | u32 airtime_link_metric_get(struct ieee80211_local *local, |
319 | struct sta_info *sta) | |
050ac52c | 320 | { |
050ac52c LCC |
321 | /* This should be adjusted for each device */ |
322 | int device_constant = 1 << ARITH_SHIFT; | |
323 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
324 | int s_unit = 1 << ARITH_SHIFT; | |
325 | int rate, err; | |
326 | u32 tx_time, estimated_retx; | |
327 | u64 result; | |
3eb0928f MR |
328 | unsigned long fail_avg = |
329 | ewma_mesh_fail_avg_read(&sta->mesh->fail_avg); | |
050ac52c | 330 | |
02a61449 MT |
331 | if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
332 | return MAX_METRIC; | |
333 | ||
3b17fbf8 MA |
334 | /* Try to get rate based on HW/SW RC algorithm. |
335 | * Rate is returned in units of Kbps, correct this | |
336 | * to comply with airtime calculation units | |
337 | * Round up in case we get rate < 100Kbps | |
338 | */ | |
339 | rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100); | |
340 | ||
341 | if (rate) { | |
342 | err = 0; | |
343 | } else { | |
fe56c9c1 | 344 | if (fail_avg > LINK_FAIL_THRESH) |
3b17fbf8 | 345 | return MAX_METRIC; |
e6a9854b | 346 | |
67fc0554 | 347 | rate = ewma_mesh_tx_rate_avg_read(&sta->mesh->tx_rate_avg); |
3b17fbf8 MA |
348 | if (WARN_ON(!rate)) |
349 | return MAX_METRIC; | |
e6a9854b | 350 | |
3eb0928f | 351 | err = (fail_avg << ARITH_SHIFT) / 100; |
3b17fbf8 | 352 | } |
050ac52c LCC |
353 | |
354 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
355 | * 1Mbps. This will be corrected on tx_time computation. | |
356 | */ | |
050ac52c LCC |
357 | tx_time = (device_constant + 10 * test_frame_len / rate); |
358 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
6194f7e6 | 359 | result = ((u64)tx_time * estimated_retx) >> (2 * ARITH_SHIFT); |
050ac52c LCC |
360 | return (u32)result; |
361 | } | |
362 | ||
363 | /** | |
364 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
365 | * | |
f698d856 | 366 | * @sdata: local mesh subif |
050ac52c LCC |
367 | * @mgmt: mesh management frame |
368 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 369 | * @action: type of hwmp ie |
050ac52c LCC |
370 | * |
371 | * This function updates the path routing information to the originator and the | |
f99288d1 | 372 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
373 | * |
374 | * Returns: metric to frame originator or 0 if the frame should not be further | |
375 | * processed | |
376 | * | |
377 | * Notes: this function is the only place (besides user-provided info) where | |
378 | * path routing information is updated. | |
379 | */ | |
f698d856 | 380 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
381 | struct ieee80211_mgmt *mgmt, |
382 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 383 | { |
f698d856 | 384 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
385 | struct mesh_path *mpath; |
386 | struct sta_info *sta; | |
387 | bool fresh_info; | |
4a3cb702 | 388 | const u8 *orig_addr, *ta; |
d19b3bf6 | 389 | u32 orig_sn, orig_metric; |
050ac52c LCC |
390 | unsigned long orig_lifetime, exp_time; |
391 | u32 last_hop_metric, new_metric; | |
392 | bool process = true; | |
cc241636 | 393 | u8 hopcount; |
050ac52c LCC |
394 | |
395 | rcu_read_lock(); | |
abe60632 | 396 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
397 | if (!sta) { |
398 | rcu_read_unlock(); | |
050ac52c | 399 | return 0; |
dc0b0f7d | 400 | } |
050ac52c LCC |
401 | |
402 | last_hop_metric = airtime_link_metric_get(local, sta); | |
403 | /* Update and check originator routing info */ | |
404 | fresh_info = true; | |
405 | ||
406 | switch (action) { | |
407 | case MPATH_PREQ: | |
408 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 409 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
410 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
411 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
cc241636 | 412 | hopcount = PREQ_IE_HOPCOUNT(hwmp_ie) + 1; |
050ac52c LCC |
413 | break; |
414 | case MPATH_PREP: | |
3c26f1f6 TP |
415 | /* Originator here refers to the MP that was the target in the |
416 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
417 | * so that we can easily use a single function to gather path |
418 | * information from both PREQ and PREP frames. | |
419 | */ | |
3c26f1f6 TP |
420 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
421 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
422 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
423 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
cc241636 | 424 | hopcount = PREP_IE_HOPCOUNT(hwmp_ie) + 1; |
050ac52c LCC |
425 | break; |
426 | default: | |
dc0b0f7d | 427 | rcu_read_unlock(); |
050ac52c LCC |
428 | return 0; |
429 | } | |
430 | new_metric = orig_metric + last_hop_metric; | |
431 | if (new_metric < orig_metric) | |
432 | new_metric = MAX_METRIC; | |
433 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
434 | ||
b203ca39 | 435 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
436 | /* This MP is the originator, we are not interested in this |
437 | * frame, except for updating transmitter's path info. | |
438 | */ | |
439 | process = false; | |
440 | fresh_info = false; | |
441 | } else { | |
bf7cd94d | 442 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
443 | if (mpath) { |
444 | spin_lock_bh(&mpath->state_lock); | |
445 | if (mpath->flags & MESH_PATH_FIXED) | |
446 | fresh_info = false; | |
447 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
448 | (mpath->flags & MESH_PATH_SN_VALID)) { |
449 | if (SN_GT(mpath->sn, orig_sn) || | |
450 | (mpath->sn == orig_sn && | |
a8d418d9 JH |
451 | (rcu_access_pointer(mpath->next_hop) != |
452 | sta ? | |
453 | mult_frac(new_metric, 10, 9) : | |
454 | new_metric) >= mpath->metric)) { | |
050ac52c LCC |
455 | process = false; |
456 | fresh_info = false; | |
457 | } | |
d8f0300a JJ |
458 | } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
459 | bool have_sn, newer_sn, bounced; | |
460 | ||
461 | have_sn = mpath->flags & MESH_PATH_SN_VALID; | |
462 | newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); | |
463 | bounced = have_sn && | |
464 | (SN_DELTA(orig_sn, mpath->sn) > | |
465 | MAX_SANE_SN_DELTA); | |
466 | ||
467 | if (!have_sn || newer_sn) { | |
468 | /* if SN is newer than what we had | |
469 | * then we can take it */; | |
470 | } else if (bounced) { | |
471 | /* if SN is way different than what | |
472 | * we had then assume the other side | |
473 | * rebooted or restarted */; | |
474 | } else { | |
475 | process = false; | |
476 | fresh_info = false; | |
477 | } | |
050ac52c LCC |
478 | } |
479 | } else { | |
ae76eef0 BC |
480 | mpath = mesh_path_add(sdata, orig_addr); |
481 | if (IS_ERR(mpath)) { | |
050ac52c | 482 | rcu_read_unlock(); |
050ac52c LCC |
483 | return 0; |
484 | } | |
485 | spin_lock_bh(&mpath->state_lock); | |
486 | } | |
487 | ||
488 | if (fresh_info) { | |
540bbcb9 JH |
489 | if (rcu_access_pointer(mpath->next_hop) != sta) |
490 | mpath->path_change_count++; | |
050ac52c | 491 | mesh_path_assign_nexthop(mpath, sta); |
d19b3bf6 | 492 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 493 | mpath->metric = new_metric; |
d19b3bf6 | 494 | mpath->sn = orig_sn; |
050ac52c LCC |
495 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
496 | ? mpath->exp_time : exp_time; | |
cc241636 | 497 | mpath->hop_count = hopcount; |
050ac52c LCC |
498 | mesh_path_activate(mpath); |
499 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
500 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
501 | /* init it at a low value - 0 start is tricky */ | |
502 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
503 | mesh_path_tx_pending(mpath); |
504 | /* draft says preq_id should be saved to, but there does | |
505 | * not seem to be any use for it, skipping by now | |
506 | */ | |
507 | } else | |
508 | spin_unlock_bh(&mpath->state_lock); | |
509 | } | |
510 | ||
511 | /* Update and check transmitter routing info */ | |
512 | ta = mgmt->sa; | |
b203ca39 | 513 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
514 | fresh_info = false; |
515 | else { | |
516 | fresh_info = true; | |
517 | ||
bf7cd94d | 518 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
519 | if (mpath) { |
520 | spin_lock_bh(&mpath->state_lock); | |
521 | if ((mpath->flags & MESH_PATH_FIXED) || | |
a8d418d9 JH |
522 | ((mpath->flags & MESH_PATH_ACTIVE) && |
523 | ((rcu_access_pointer(mpath->next_hop) != sta ? | |
524 | mult_frac(last_hop_metric, 10, 9) : | |
525 | last_hop_metric) > mpath->metric))) | |
050ac52c LCC |
526 | fresh_info = false; |
527 | } else { | |
ae76eef0 BC |
528 | mpath = mesh_path_add(sdata, ta); |
529 | if (IS_ERR(mpath)) { | |
050ac52c | 530 | rcu_read_unlock(); |
050ac52c LCC |
531 | return 0; |
532 | } | |
533 | spin_lock_bh(&mpath->state_lock); | |
534 | } | |
535 | ||
536 | if (fresh_info) { | |
540bbcb9 JH |
537 | if (rcu_access_pointer(mpath->next_hop) != sta) |
538 | mpath->path_change_count++; | |
050ac52c | 539 | mesh_path_assign_nexthop(mpath, sta); |
050ac52c LCC |
540 | mpath->metric = last_hop_metric; |
541 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
542 | ? mpath->exp_time : exp_time; | |
cc241636 | 543 | mpath->hop_count = 1; |
050ac52c LCC |
544 | mesh_path_activate(mpath); |
545 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
546 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
547 | /* init it at a low value - 0 start is tricky */ | |
548 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
549 | mesh_path_tx_pending(mpath); |
550 | } else | |
551 | spin_unlock_bh(&mpath->state_lock); | |
552 | } | |
553 | ||
050ac52c LCC |
554 | rcu_read_unlock(); |
555 | ||
556 | return process ? new_metric : 0; | |
557 | } | |
558 | ||
f698d856 | 559 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 560 | struct ieee80211_mgmt *mgmt, |
5ec596c4 | 561 | const u8 *preq_elem, u32 orig_metric) |
57ef5ddb | 562 | { |
472dbc45 | 563 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 564 | struct mesh_path *mpath = NULL; |
4a3cb702 | 565 | const u8 *target_addr, *orig_addr; |
3d045a54 | 566 | const u8 *da; |
3fbf4b71 | 567 | u8 target_flags, ttl, flags; |
b4201cc4 | 568 | u32 orig_sn, target_sn, lifetime, target_metric = 0; |
050ac52c LCC |
569 | bool reply = false; |
570 | bool forward = true; | |
3fbf4b71 | 571 | bool root_is_gate; |
050ac52c | 572 | |
d19b3bf6 RP |
573 | /* Update target SN, if present */ |
574 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 575 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
576 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
577 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
578 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
579 | /* Proactive PREQ gate announcements */ |
580 | flags = PREQ_IE_FLAGS(preq_elem); | |
581 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 582 | |
bdcbd8e0 | 583 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 584 | |
b203ca39 | 585 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 586 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
587 | forward = false; |
588 | reply = true; | |
5ec596c4 | 589 | target_metric = 0; |
1f631c32 YCP |
590 | |
591 | if (SN_GT(target_sn, ifmsh->sn)) | |
592 | ifmsh->sn = target_sn; | |
593 | ||
d19b3bf6 | 594 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 595 | net_traversal_jiffies(sdata)) || |
d19b3bf6 | 596 | time_before(jiffies, ifmsh->last_sn_update)) { |
bc3ce0b0 | 597 | ++ifmsh->sn; |
d19b3bf6 | 598 | ifmsh->last_sn_update = jiffies; |
050ac52c | 599 | } |
bc3ce0b0 | 600 | target_sn = ifmsh->sn; |
3fbf4b71 CYY |
601 | } else if (is_broadcast_ether_addr(target_addr) && |
602 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
603 | rcu_read_lock(); | |
bf7cd94d | 604 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
605 | if (mpath) { |
606 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
607 | reply = true; | |
608 | target_addr = sdata->vif.addr; | |
609 | target_sn = ++ifmsh->sn; | |
5ec596c4 | 610 | target_metric = 0; |
3fbf4b71 CYY |
611 | ifmsh->last_sn_update = jiffies; |
612 | } | |
613 | if (root_is_gate) | |
614 | mesh_path_add_gate(mpath); | |
615 | } | |
616 | rcu_read_unlock(); | |
050ac52c LCC |
617 | } else { |
618 | rcu_read_lock(); | |
bf7cd94d | 619 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 620 | if (mpath) { |
d19b3bf6 RP |
621 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
622 | SN_LT(mpath->sn, target_sn)) { | |
623 | mpath->sn = target_sn; | |
624 | mpath->flags |= MESH_PATH_SN_VALID; | |
932e628d | 625 | } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
050ac52c LCC |
626 | (mpath->flags & MESH_PATH_ACTIVE)) { |
627 | reply = true; | |
5ec596c4 | 628 | target_metric = mpath->metric; |
d19b3bf6 | 629 | target_sn = mpath->sn; |
932e628d CYY |
630 | /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
631 | target_flags |= IEEE80211_PREQ_TO_FLAG; | |
050ac52c LCC |
632 | } |
633 | } | |
634 | rcu_read_unlock(); | |
635 | } | |
636 | ||
637 | if (reply) { | |
638 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 639 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 640 | if (ttl != 0) { |
bdcbd8e0 | 641 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 | 642 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
f63f8421 CYY |
643 | orig_sn, 0, target_addr, |
644 | target_sn, mgmt->sa, 0, ttl, | |
5ec596c4 AG |
645 | lifetime, target_metric, 0, |
646 | sdata); | |
3fbf4b71 | 647 | } else { |
472dbc45 | 648 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 649 | } |
050ac52c LCC |
650 | } |
651 | ||
94f90656 | 652 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 653 | u32 preq_id; |
3fbf4b71 | 654 | u8 hopcount; |
050ac52c LCC |
655 | |
656 | ttl = PREQ_IE_TTL(preq_elem); | |
657 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
658 | if (ttl <= 1) { | |
472dbc45 | 659 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
660 | return; |
661 | } | |
bdcbd8e0 | 662 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 663 | --ttl; |
050ac52c LCC |
664 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
665 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
666 | da = (mpath && mpath->is_root) ? |
667 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
668 | |
669 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
670 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
671 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
3fbf4b71 CYY |
672 | } |
673 | ||
050ac52c | 674 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
f63f8421 CYY |
675 | orig_sn, target_flags, target_addr, |
676 | target_sn, da, hopcount, ttl, lifetime, | |
5ec596c4 | 677 | orig_metric, preq_id, sdata); |
7d4e15b1 CYY |
678 | if (!is_multicast_ether_addr(da)) |
679 | ifmsh->mshstats.fwded_unicast++; | |
680 | else | |
681 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 682 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
683 | } |
684 | } | |
685 | ||
686 | ||
40b275b6 JB |
687 | static inline struct sta_info * |
688 | next_hop_deref_protected(struct mesh_path *mpath) | |
689 | { | |
690 | return rcu_dereference_protected(mpath->next_hop, | |
691 | lockdep_is_held(&mpath->state_lock)); | |
692 | } | |
693 | ||
694 | ||
f698d856 | 695 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 696 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 697 | const u8 *prep_elem, u32 metric) |
050ac52c | 698 | { |
d665508b | 699 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 700 | struct mesh_path *mpath; |
4a3cb702 | 701 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
702 | u8 ttl, hopcount, flags; |
703 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 704 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 705 | |
bdcbd8e0 | 706 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 707 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 708 | |
3c26f1f6 | 709 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 710 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
711 | /* destination, no forwarding required */ |
712 | return; | |
713 | ||
d665508b CYY |
714 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
715 | return; | |
716 | ||
050ac52c LCC |
717 | ttl = PREP_IE_TTL(prep_elem); |
718 | if (ttl <= 1) { | |
472dbc45 | 719 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
720 | return; |
721 | } | |
722 | ||
723 | rcu_read_lock(); | |
bf7cd94d | 724 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
725 | if (mpath) |
726 | spin_lock_bh(&mpath->state_lock); | |
727 | else | |
728 | goto fail; | |
729 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
730 | spin_unlock_bh(&mpath->state_lock); | |
731 | goto fail; | |
732 | } | |
40b275b6 | 733 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
734 | spin_unlock_bh(&mpath->state_lock); |
735 | --ttl; | |
736 | flags = PREP_IE_FLAGS(prep_elem); | |
737 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
738 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 739 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
740 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
741 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c | 742 | |
f63f8421 CYY |
743 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
744 | target_addr, target_sn, next_hop, hopcount, | |
745 | ttl, lifetime, metric, 0, sdata); | |
050ac52c | 746 | rcu_read_unlock(); |
c8a61a7d DW |
747 | |
748 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 749 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
750 | return; |
751 | ||
752 | fail: | |
753 | rcu_read_unlock(); | |
472dbc45 | 754 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
755 | } |
756 | ||
f698d856 | 757 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
758 | struct ieee80211_mgmt *mgmt, |
759 | const u8 *perr_elem) | |
050ac52c | 760 | { |
d611f062 | 761 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 762 | struct mesh_path *mpath; |
d611f062 | 763 | u8 ttl; |
4a3cb702 | 764 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
765 | u32 target_sn; |
766 | u16 target_rcode; | |
050ac52c LCC |
767 | |
768 | ta = mgmt->sa; | |
d611f062 RP |
769 | ttl = PERR_IE_TTL(perr_elem); |
770 | if (ttl <= 1) { | |
771 | ifmsh->mshstats.dropped_frames_ttl++; | |
772 | return; | |
773 | } | |
774 | ttl--; | |
d19b3bf6 RP |
775 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
776 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
777 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 778 | |
050ac52c | 779 | rcu_read_lock(); |
bf7cd94d | 780 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 781 | if (mpath) { |
888d04df FF |
782 | struct sta_info *sta; |
783 | ||
050ac52c | 784 | spin_lock_bh(&mpath->state_lock); |
888d04df | 785 | sta = next_hop_deref_protected(mpath); |
050ac52c | 786 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 787 | ether_addr_equal(ta, sta->sta.addr) && |
5df20f21 | 788 | !(mpath->flags & MESH_PATH_FIXED) && |
d19b3bf6 | 789 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
703ee73a | 790 | SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
050ac52c | 791 | mpath->flags &= ~MESH_PATH_ACTIVE; |
703ee73a AG |
792 | if (target_sn != 0) |
793 | mpath->sn = target_sn; | |
794 | else | |
795 | mpath->sn += 1; | |
050ac52c | 796 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
797 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
798 | goto endperr; | |
bf7cd94d | 799 | mesh_path_error_tx(sdata, ttl, target_addr, |
f63f8421 | 800 | target_sn, target_rcode, |
bf7cd94d | 801 | broadcast_addr); |
050ac52c LCC |
802 | } else |
803 | spin_unlock_bh(&mpath->state_lock); | |
804 | } | |
d665508b | 805 | endperr: |
050ac52c LCC |
806 | rcu_read_unlock(); |
807 | } | |
808 | ||
90a5e169 | 809 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
810 | struct ieee80211_mgmt *mgmt, |
811 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
812 | { |
813 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
814 | struct ieee80211_local *local = sdata->local; |
815 | struct sta_info *sta; | |
90a5e169 | 816 | struct mesh_path *mpath; |
90a5e169 | 817 | u8 ttl, flags, hopcount; |
4a3cb702 | 818 | const u8 *orig_addr; |
fbbdad5e | 819 | u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval; |
5ee68e5b | 820 | bool root_is_gate; |
90a5e169 | 821 | |
90a5e169 | 822 | ttl = rann->rann_ttl; |
90a5e169 | 823 | flags = rann->rann_flags; |
5ee68e5b | 824 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 825 | orig_addr = rann->rann_addr; |
292c41ac | 826 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 827 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 828 | hopcount = rann->rann_hopcount; |
a6a58b4f | 829 | hopcount++; |
fbbdad5e | 830 | orig_metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
831 | |
832 | /* Ignore our own RANNs */ | |
b203ca39 | 833 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
834 | return; |
835 | ||
bdcbd8e0 JB |
836 | mhwmp_dbg(sdata, |
837 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
838 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
839 | |
840 | rcu_read_lock(); | |
d2a079fd CYY |
841 | sta = sta_info_get(sdata, mgmt->sa); |
842 | if (!sta) { | |
843 | rcu_read_unlock(); | |
844 | return; | |
845 | } | |
846 | ||
fbbdad5e CYY |
847 | last_hop_metric = airtime_link_metric_get(local, sta); |
848 | new_metric = orig_metric + last_hop_metric; | |
849 | if (new_metric < orig_metric) | |
850 | new_metric = MAX_METRIC; | |
d2a079fd | 851 | |
bf7cd94d | 852 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 853 | if (!mpath) { |
ae76eef0 BC |
854 | mpath = mesh_path_add(sdata, orig_addr); |
855 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
856 | rcu_read_unlock(); |
857 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
858 | return; | |
859 | } | |
90a5e169 | 860 | } |
5ee68e5b | 861 | |
7ebfa469 | 862 | if (!(SN_LT(mpath->sn, orig_sn)) && |
fbbdad5e | 863 | !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) { |
7ebfa469 CYY |
864 | rcu_read_unlock(); |
865 | return; | |
866 | } | |
867 | ||
5ee68e5b | 868 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
869 | (time_after(jiffies, mpath->last_preq_to_root + |
870 | root_path_confirmation_jiffies(sdata)) || | |
871 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 872 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
873 | mhwmp_dbg(sdata, |
874 | "time to refresh root mpath %pM\n", | |
875 | orig_addr); | |
5ee68e5b | 876 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 877 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
878 | } |
879 | ||
7ebfa469 | 880 | mpath->sn = orig_sn; |
fbbdad5e | 881 | mpath->rann_metric = new_metric; |
7ebfa469 CYY |
882 | mpath->is_root = true; |
883 | /* Recording RANNs sender address to send individually | |
884 | * addressed PREQs destined for root mesh STA */ | |
885 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
886 | ||
887 | if (root_is_gate) | |
888 | mesh_path_add_gate(mpath); | |
889 | ||
890 | if (ttl <= 1) { | |
891 | ifmsh->mshstats.dropped_frames_ttl++; | |
892 | rcu_read_unlock(); | |
893 | return; | |
894 | } | |
895 | ttl--; | |
896 | ||
897 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 898 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
f63f8421 CYY |
899 | orig_sn, 0, NULL, 0, broadcast_addr, |
900 | hopcount, ttl, interval, | |
fbbdad5e | 901 | new_metric, 0, sdata); |
90a5e169 | 902 | } |
3d045a54 | 903 | |
90a5e169 RP |
904 | rcu_read_unlock(); |
905 | } | |
050ac52c LCC |
906 | |
907 | ||
f698d856 | 908 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 909 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c LCC |
910 | { |
911 | struct ieee802_11_elems elems; | |
912 | size_t baselen; | |
afd2efb9 | 913 | u32 path_metric; |
97091317 | 914 | struct sta_info *sta; |
050ac52c | 915 | |
9c80d3dc JB |
916 | /* need action_code */ |
917 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
918 | return; | |
919 | ||
97091317 JC |
920 | rcu_read_lock(); |
921 | sta = sta_info_get(sdata, mgmt->sa); | |
433f5bc1 | 922 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
97091317 JC |
923 | rcu_read_unlock(); |
924 | return; | |
925 | } | |
926 | rcu_read_unlock(); | |
927 | ||
050ac52c LCC |
928 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
929 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
4abb52a4 | 930 | len - baselen, false, &elems, mgmt->bssid, NULL); |
050ac52c | 931 | |
dbb81c42 RP |
932 | if (elems.preq) { |
933 | if (elems.preq_len != 37) | |
050ac52c LCC |
934 | /* Right now we support just 1 destination and no AE */ |
935 | return; | |
afd2efb9 AG |
936 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
937 | MPATH_PREQ); | |
938 | if (path_metric) | |
dbb81c42 | 939 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, |
afd2efb9 | 940 | path_metric); |
dbb81c42 RP |
941 | } |
942 | if (elems.prep) { | |
943 | if (elems.prep_len != 31) | |
050ac52c LCC |
944 | /* Right now we support no AE */ |
945 | return; | |
afd2efb9 AG |
946 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
947 | MPATH_PREP); | |
948 | if (path_metric) | |
dbb81c42 | 949 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, |
afd2efb9 | 950 | path_metric); |
dbb81c42 RP |
951 | } |
952 | if (elems.perr) { | |
d611f062 | 953 | if (elems.perr_len != 15) |
050ac52c LCC |
954 | /* Right now we support only one destination per PERR */ |
955 | return; | |
f698d856 | 956 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 957 | } |
90a5e169 RP |
958 | if (elems.rann) |
959 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
960 | } |
961 | ||
962 | /** | |
963 | * mesh_queue_preq - queue a PREQ to a given destination | |
964 | * | |
965 | * @mpath: mesh path to discover | |
966 | * @flags: special attributes of the PREQ to be sent | |
967 | * | |
968 | * Locking: the function must be called from within a rcu read lock block. | |
969 | * | |
970 | */ | |
971 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
972 | { | |
f698d856 | 973 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 974 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
975 | struct mesh_preq_queue *preq_node; |
976 | ||
59615b5f | 977 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 978 | if (!preq_node) { |
bdcbd8e0 | 979 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
980 | return; |
981 | } | |
982 | ||
987dafad | 983 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 984 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 985 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
986 | kfree(preq_node); |
987 | if (printk_ratelimit()) | |
bdcbd8e0 | 988 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
989 | return; |
990 | } | |
991 | ||
f2dc7989 | 992 | spin_lock(&mpath->state_lock); |
f3011cf9 | 993 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 994 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 995 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 996 | kfree(preq_node); |
f3011cf9 JC |
997 | return; |
998 | } | |
999 | ||
050ac52c LCC |
1000 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
1001 | preq_node->flags = flags; | |
1002 | ||
f3011cf9 | 1003 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 1004 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 1005 | |
472dbc45 JB |
1006 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
1007 | ++ifmsh->preq_queue_len; | |
987dafad | 1008 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 1009 | |
472dbc45 | 1010 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 1011 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 1012 | |
472dbc45 | 1013 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
1014 | /* avoid long wait if did not send preqs for a long time |
1015 | * and jiffies wrapped around | |
1016 | */ | |
472dbc45 | 1017 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 1018 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 1019 | } else |
472dbc45 | 1020 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
1021 | min_preq_int_jiff(sdata)); |
1022 | } | |
1023 | ||
1024 | /** | |
1025 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
1026 | * | |
f698d856 | 1027 | * @sdata: local mesh subif |
050ac52c | 1028 | */ |
f698d856 | 1029 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 1030 | { |
472dbc45 | 1031 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
1032 | struct mesh_preq_queue *preq_node; |
1033 | struct mesh_path *mpath; | |
932e628d | 1034 | u8 ttl, target_flags = 0; |
3d045a54 | 1035 | const u8 *da; |
050ac52c LCC |
1036 | u32 lifetime; |
1037 | ||
a43816df | 1038 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
1039 | if (!ifmsh->preq_queue_len || |
1040 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 1041 | min_preq_int_jiff(sdata))) { |
a43816df | 1042 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1043 | return; |
1044 | } | |
1045 | ||
472dbc45 | 1046 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
1047 | struct mesh_preq_queue, list); |
1048 | list_del(&preq_node->list); | |
472dbc45 | 1049 | --ifmsh->preq_queue_len; |
a43816df | 1050 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1051 | |
1052 | rcu_read_lock(); | |
bf7cd94d | 1053 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
1054 | if (!mpath) |
1055 | goto enddiscovery; | |
1056 | ||
1057 | spin_lock_bh(&mpath->state_lock); | |
5df20f21 | 1058 | if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { |
74932959 BC |
1059 | spin_unlock_bh(&mpath->state_lock); |
1060 | goto enddiscovery; | |
1061 | } | |
f3011cf9 | 1062 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1063 | if (preq_node->flags & PREQ_Q_F_START) { |
1064 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1065 | spin_unlock_bh(&mpath->state_lock); | |
1066 | goto enddiscovery; | |
1067 | } else { | |
1068 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1069 | mpath->flags |= MESH_PATH_RESOLVING; | |
1070 | mpath->discovery_retries = 0; | |
1071 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1072 | } | |
1073 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1074 | mpath->flags & MESH_PATH_RESOLVED) { | |
1075 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1076 | spin_unlock_bh(&mpath->state_lock); | |
1077 | goto enddiscovery; | |
1078 | } | |
1079 | ||
472dbc45 | 1080 | ifmsh->last_preq = jiffies; |
050ac52c | 1081 | |
d19b3bf6 | 1082 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1083 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1084 | time_before(jiffies, ifmsh->last_sn_update)) { |
1085 | ++ifmsh->sn; | |
1086 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1087 | } |
1088 | lifetime = default_lifetime(sdata); | |
45904f21 | 1089 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1090 | if (ttl == 0) { |
472dbc45 | 1091 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1092 | spin_unlock_bh(&mpath->state_lock); |
1093 | goto enddiscovery; | |
1094 | } | |
1095 | ||
1096 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
932e628d | 1097 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
050ac52c | 1098 | else |
932e628d | 1099 | target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
050ac52c LCC |
1100 | |
1101 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1102 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
f63f8421 CYY |
1103 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
1104 | target_flags, mpath->dst, mpath->sn, da, 0, | |
1105 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); | |
e2d4a80f LL |
1106 | |
1107 | spin_lock_bh(&mpath->state_lock); | |
01da2e05 PM |
1108 | if (!(mpath->flags & MESH_PATH_DELETED)) |
1109 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); | |
e2d4a80f | 1110 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1111 | |
1112 | enddiscovery: | |
1113 | rcu_read_unlock(); | |
1114 | kfree(preq_node); | |
1115 | } | |
1116 | ||
2c53040f BH |
1117 | /** |
1118 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1119 | * |
e32f85f7 | 1120 | * @skb: 802.11 frame to be sent |
f698d856 | 1121 | * @sdata: network subif the frame will be sent through |
050ac52c | 1122 | * |
2c53040f BH |
1123 | * Lookup next hop for given skb and start path discovery if no |
1124 | * forwarding information is found. | |
1125 | * | |
0cfda851 TP |
1126 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1127 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1128 | */ |
bf7cd94d JB |
1129 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1130 | struct sk_buff *skb) | |
050ac52c | 1131 | { |
e32f85f7 | 1132 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1133 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1134 | struct mesh_path *mpath; | |
1135 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1136 | u8 *target_addr = hdr->addr3; |
050ac52c | 1137 | |
3f52b7e3 MP |
1138 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1139 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1140 | return 0; | |
1141 | ||
8828f81a RM |
1142 | /* Allow injected packets to bypass mesh routing */ |
1143 | if (info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) | |
1144 | return 0; | |
1145 | ||
ef618b1b FF |
1146 | if (!mesh_nexthop_lookup(sdata, skb)) |
1147 | return 0; | |
050ac52c | 1148 | |
0cfda851 | 1149 | /* no nexthop found, start resolving */ |
bf7cd94d | 1150 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1151 | if (!mpath) { |
ae76eef0 BC |
1152 | mpath = mesh_path_add(sdata, target_addr); |
1153 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1154 | mesh_path_discard_frame(sdata, skb); |
ef618b1b | 1155 | return PTR_ERR(mpath); |
050ac52c LCC |
1156 | } |
1157 | } | |
1158 | ||
ba32679c NC |
1159 | if (!(mpath->flags & MESH_PATH_RESOLVING) && |
1160 | mesh_path_sel_is_hwmp(sdata)) | |
0cfda851 TP |
1161 | mesh_queue_preq(mpath, PREQ_Q_F_START); |
1162 | ||
1163 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1164 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1165 | ||
cc20ff2c | 1166 | info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
0cfda851 TP |
1167 | ieee80211_set_qos_hdr(sdata, skb); |
1168 | skb_queue_tail(&mpath->frame_queue, skb); | |
0cfda851 | 1169 | if (skb_to_free) |
bf7cd94d | 1170 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 | 1171 | |
ef618b1b | 1172 | return -ENOENT; |
0cfda851 | 1173 | } |
bf7cd94d | 1174 | |
e3718a61 LL |
1175 | /** |
1176 | * mesh_nexthop_lookup_nolearn - try to set next hop without path discovery | |
1177 | * @skb: 802.11 frame to be sent | |
1178 | * @sdata: network subif the frame will be sent through | |
1179 | * | |
1180 | * Check if the meshDA (addr3) of a unicast frame is a direct neighbor. | |
1181 | * And if so, set the RA (addr1) to it to transmit to this node directly, | |
1182 | * avoiding PREQ/PREP path discovery. | |
1183 | * | |
1184 | * Returns: 0 if the next hop was found and -ENOENT otherwise. | |
1185 | */ | |
1186 | static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata, | |
1187 | struct sk_buff *skb) | |
1188 | { | |
1189 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1190 | struct sta_info *sta; | |
1191 | ||
1192 | if (is_multicast_ether_addr(hdr->addr1)) | |
1193 | return -ENOENT; | |
1194 | ||
1195 | rcu_read_lock(); | |
1196 | sta = sta_info_get(sdata, hdr->addr3); | |
1197 | ||
1198 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { | |
1199 | rcu_read_unlock(); | |
1200 | return -ENOENT; | |
1201 | } | |
1202 | rcu_read_unlock(); | |
1203 | ||
1204 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1205 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1206 | return 0; | |
1207 | } | |
1208 | ||
0cfda851 TP |
1209 | /** |
1210 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1211 | * this function is considered "using" the associated mpath, so preempt a path | |
1212 | * refresh if this mpath expires soon. | |
1213 | * | |
1214 | * @skb: 802.11 frame to be sent | |
1215 | * @sdata: network subif the frame will be sent through | |
1216 | * | |
1217 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1218 | */ | |
bf7cd94d JB |
1219 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1220 | struct sk_buff *skb) | |
0cfda851 | 1221 | { |
e3718a61 | 1222 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
0cfda851 TP |
1223 | struct mesh_path *mpath; |
1224 | struct sta_info *next_hop; | |
1225 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1226 | u8 *target_addr = hdr->addr3; | |
050ac52c | 1227 | |
e3718a61 LL |
1228 | if (ifmsh->mshcfg.dot11MeshNolearn && |
1229 | !mesh_nexthop_lookup_nolearn(sdata, skb)) | |
1230 | return 0; | |
1231 | ||
bf7cd94d | 1232 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 | 1233 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) |
ef618b1b | 1234 | return -ENOENT; |
0cfda851 TP |
1235 | |
1236 | if (time_after(jiffies, | |
1237 | mpath->exp_time - | |
1238 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1239 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1240 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1241 | !(mpath->flags & MESH_PATH_FIXED)) | |
1242 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1243 | |
0cfda851 TP |
1244 | next_hop = rcu_dereference(mpath->next_hop); |
1245 | if (next_hop) { | |
1246 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1247 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
3f52b7e3 | 1248 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
ef618b1b | 1249 | return 0; |
050ac52c LCC |
1250 | } |
1251 | ||
ef618b1b | 1252 | return -ENOENT; |
050ac52c LCC |
1253 | } |
1254 | ||
34f11cd3 | 1255 | void mesh_path_timer(struct timer_list *t) |
050ac52c | 1256 | { |
34f11cd3 | 1257 | struct mesh_path *mpath = from_timer(mpath, t, timer); |
dea4096b | 1258 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
5ee68e5b | 1259 | int ret; |
5bb644a0 | 1260 | |
dea4096b | 1261 | if (sdata->local->quiescing) |
5bb644a0 | 1262 | return; |
5bb644a0 JB |
1263 | |
1264 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1265 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1266 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1267 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1268 | spin_unlock_bh(&mpath->state_lock); |
1269 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1270 | ++mpath->discovery_retries; |
1271 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1272 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1273 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1274 | mesh_queue_preq(mpath, 0); |
1275 | } else { | |
d8254710 JJ |
1276 | mpath->flags &= ~(MESH_PATH_RESOLVING | |
1277 | MESH_PATH_RESOLVED | | |
1278 | MESH_PATH_REQ_QUEUED); | |
050ac52c | 1279 | mpath->exp_time = jiffies; |
5ee68e5b JC |
1280 | spin_unlock_bh(&mpath->state_lock); |
1281 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1282 | ret = mesh_path_send_to_gates(mpath); | |
1283 | if (ret) | |
bdcbd8e0 | 1284 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1285 | } else |
1286 | mesh_path_flush_pending(mpath); | |
050ac52c | 1287 | } |
050ac52c | 1288 | } |
e304bfd3 | 1289 | |
bf7cd94d | 1290 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
1291 | { |
1292 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1293 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1294 | u8 flags, target_flags = 0; |
e304bfd3 | 1295 | |
16dd7267 JC |
1296 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1297 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1298 | |
1299 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1300 | case IEEE80211_PROACTIVE_RANN: | |
1301 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
f63f8421 CYY |
1302 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
1303 | 0, ifmsh->mshcfg.element_ttl, | |
1304 | interval, 0, 0, sdata); | |
a69cc44f CYY |
1305 | break; |
1306 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1307 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
fc0561dc | 1308 | fallthrough; |
a69cc44f CYY |
1309 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: |
1310 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1311 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1312 | IEEE80211_PREQ_USN_FLAG; | |
1313 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
f63f8421 CYY |
1314 | ++ifmsh->sn, target_flags, |
1315 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1316 | 0, ifmsh->mshcfg.element_ttl, interval, | |
1317 | 0, ifmsh->preq_id++, sdata); | |
a69cc44f CYY |
1318 | break; |
1319 | default: | |
bdcbd8e0 | 1320 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1321 | return; |
1322 | } | |
e304bfd3 | 1323 | } |