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. |
16114496 | 4 | * Copyright (C) 2019, 2021-2023 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 + |
23a5f0af | 250 | IEEE80211_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; | |
23a5f0af | 256 | skb_reserve(skb, local->tx_headroom + IEEE80211_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 | 312 | |
0bd50932 AKS |
313 | /* use rate info set by the driver directly if present */ |
314 | if (st->n_rates) | |
315 | rinfo = sta->deflink.tx_stats.last_rate_info; | |
316 | else | |
317 | sta_set_rate_info_tx(sta, &sta->deflink.tx_stats.last_rate, &rinfo); | |
318 | ||
67fc0554 JH |
319 | ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg, |
320 | cfg80211_calculate_bitrate(&rinfo)); | |
bfc32e6a JC |
321 | } |
322 | ||
ab60633c NM |
323 | u32 airtime_link_metric_get(struct ieee80211_local *local, |
324 | struct sta_info *sta) | |
050ac52c | 325 | { |
050ac52c LCC |
326 | /* This should be adjusted for each device */ |
327 | int device_constant = 1 << ARITH_SHIFT; | |
328 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
329 | int s_unit = 1 << ARITH_SHIFT; | |
330 | int rate, err; | |
331 | u32 tx_time, estimated_retx; | |
332 | u64 result; | |
3eb0928f MR |
333 | unsigned long fail_avg = |
334 | ewma_mesh_fail_avg_read(&sta->mesh->fail_avg); | |
050ac52c | 335 | |
02a61449 MT |
336 | if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) |
337 | return MAX_METRIC; | |
338 | ||
3b17fbf8 MA |
339 | /* Try to get rate based on HW/SW RC algorithm. |
340 | * Rate is returned in units of Kbps, correct this | |
341 | * to comply with airtime calculation units | |
342 | * Round up in case we get rate < 100Kbps | |
343 | */ | |
344 | rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100); | |
345 | ||
346 | if (rate) { | |
347 | err = 0; | |
348 | } else { | |
fe56c9c1 | 349 | if (fail_avg > LINK_FAIL_THRESH) |
3b17fbf8 | 350 | return MAX_METRIC; |
e6a9854b | 351 | |
67fc0554 | 352 | rate = ewma_mesh_tx_rate_avg_read(&sta->mesh->tx_rate_avg); |
3b17fbf8 MA |
353 | if (WARN_ON(!rate)) |
354 | return MAX_METRIC; | |
e6a9854b | 355 | |
3eb0928f | 356 | err = (fail_avg << ARITH_SHIFT) / 100; |
3b17fbf8 | 357 | } |
050ac52c LCC |
358 | |
359 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
360 | * 1Mbps. This will be corrected on tx_time computation. | |
361 | */ | |
050ac52c LCC |
362 | tx_time = (device_constant + 10 * test_frame_len / rate); |
363 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
6194f7e6 | 364 | result = ((u64)tx_time * estimated_retx) >> (2 * ARITH_SHIFT); |
050ac52c LCC |
365 | return (u32)result; |
366 | } | |
367 | ||
368 | /** | |
369 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
370 | * | |
f698d856 | 371 | * @sdata: local mesh subif |
050ac52c LCC |
372 | * @mgmt: mesh management frame |
373 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 374 | * @action: type of hwmp ie |
050ac52c LCC |
375 | * |
376 | * This function updates the path routing information to the originator and the | |
f99288d1 | 377 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
378 | * |
379 | * Returns: metric to frame originator or 0 if the frame should not be further | |
380 | * processed | |
381 | * | |
382 | * Notes: this function is the only place (besides user-provided info) where | |
383 | * path routing information is updated. | |
384 | */ | |
f698d856 | 385 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
386 | struct ieee80211_mgmt *mgmt, |
387 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 388 | { |
f698d856 | 389 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
390 | struct mesh_path *mpath; |
391 | struct sta_info *sta; | |
392 | bool fresh_info; | |
4a3cb702 | 393 | const u8 *orig_addr, *ta; |
d19b3bf6 | 394 | u32 orig_sn, orig_metric; |
050ac52c LCC |
395 | unsigned long orig_lifetime, exp_time; |
396 | u32 last_hop_metric, new_metric; | |
d5edb9ae | 397 | bool flush_mpath = false; |
050ac52c | 398 | bool process = true; |
cc241636 | 399 | u8 hopcount; |
050ac52c LCC |
400 | |
401 | rcu_read_lock(); | |
abe60632 | 402 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
403 | if (!sta) { |
404 | rcu_read_unlock(); | |
050ac52c | 405 | return 0; |
dc0b0f7d | 406 | } |
050ac52c LCC |
407 | |
408 | last_hop_metric = airtime_link_metric_get(local, sta); | |
409 | /* Update and check originator routing info */ | |
410 | fresh_info = true; | |
411 | ||
412 | switch (action) { | |
413 | case MPATH_PREQ: | |
414 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 415 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
416 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
417 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
cc241636 | 418 | hopcount = PREQ_IE_HOPCOUNT(hwmp_ie) + 1; |
050ac52c LCC |
419 | break; |
420 | case MPATH_PREP: | |
3c26f1f6 TP |
421 | /* Originator here refers to the MP that was the target in the |
422 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
423 | * so that we can easily use a single function to gather path |
424 | * information from both PREQ and PREP frames. | |
425 | */ | |
3c26f1f6 TP |
426 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
427 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
428 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
429 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
cc241636 | 430 | hopcount = PREP_IE_HOPCOUNT(hwmp_ie) + 1; |
050ac52c LCC |
431 | break; |
432 | default: | |
dc0b0f7d | 433 | rcu_read_unlock(); |
050ac52c LCC |
434 | return 0; |
435 | } | |
436 | new_metric = orig_metric + last_hop_metric; | |
437 | if (new_metric < orig_metric) | |
438 | new_metric = MAX_METRIC; | |
439 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
440 | ||
b203ca39 | 441 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
442 | /* This MP is the originator, we are not interested in this |
443 | * frame, except for updating transmitter's path info. | |
444 | */ | |
445 | process = false; | |
446 | fresh_info = false; | |
447 | } else { | |
bf7cd94d | 448 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
449 | if (mpath) { |
450 | spin_lock_bh(&mpath->state_lock); | |
451 | if (mpath->flags & MESH_PATH_FIXED) | |
452 | fresh_info = false; | |
453 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
454 | (mpath->flags & MESH_PATH_SN_VALID)) { |
455 | if (SN_GT(mpath->sn, orig_sn) || | |
456 | (mpath->sn == orig_sn && | |
a8d418d9 JH |
457 | (rcu_access_pointer(mpath->next_hop) != |
458 | sta ? | |
459 | mult_frac(new_metric, 10, 9) : | |
460 | new_metric) >= mpath->metric)) { | |
050ac52c LCC |
461 | process = false; |
462 | fresh_info = false; | |
463 | } | |
d8f0300a JJ |
464 | } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
465 | bool have_sn, newer_sn, bounced; | |
466 | ||
467 | have_sn = mpath->flags & MESH_PATH_SN_VALID; | |
468 | newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); | |
469 | bounced = have_sn && | |
470 | (SN_DELTA(orig_sn, mpath->sn) > | |
471 | MAX_SANE_SN_DELTA); | |
472 | ||
473 | if (!have_sn || newer_sn) { | |
474 | /* if SN is newer than what we had | |
475 | * then we can take it */; | |
476 | } else if (bounced) { | |
477 | /* if SN is way different than what | |
478 | * we had then assume the other side | |
479 | * rebooted or restarted */; | |
480 | } else { | |
481 | process = false; | |
482 | fresh_info = false; | |
483 | } | |
050ac52c LCC |
484 | } |
485 | } else { | |
ae76eef0 BC |
486 | mpath = mesh_path_add(sdata, orig_addr); |
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) { | |
d5edb9ae | 495 | if (rcu_access_pointer(mpath->next_hop) != sta) { |
540bbcb9 | 496 | mpath->path_change_count++; |
d5edb9ae FF |
497 | flush_mpath = true; |
498 | } | |
050ac52c | 499 | mesh_path_assign_nexthop(mpath, sta); |
d19b3bf6 | 500 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 501 | mpath->metric = new_metric; |
d19b3bf6 | 502 | mpath->sn = orig_sn; |
050ac52c LCC |
503 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
504 | ? mpath->exp_time : exp_time; | |
cc241636 | 505 | mpath->hop_count = hopcount; |
050ac52c LCC |
506 | mesh_path_activate(mpath); |
507 | spin_unlock_bh(&mpath->state_lock); | |
d5edb9ae FF |
508 | if (flush_mpath) |
509 | mesh_fast_tx_flush_mpath(mpath); | |
3eb0928f MR |
510 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
511 | /* init it at a low value - 0 start is tricky */ | |
512 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
513 | mesh_path_tx_pending(mpath); |
514 | /* draft says preq_id should be saved to, but there does | |
515 | * not seem to be any use for it, skipping by now | |
516 | */ | |
517 | } else | |
518 | spin_unlock_bh(&mpath->state_lock); | |
519 | } | |
520 | ||
521 | /* Update and check transmitter routing info */ | |
522 | ta = mgmt->sa; | |
b203ca39 | 523 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
524 | fresh_info = false; |
525 | else { | |
526 | fresh_info = true; | |
527 | ||
bf7cd94d | 528 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
529 | if (mpath) { |
530 | spin_lock_bh(&mpath->state_lock); | |
531 | if ((mpath->flags & MESH_PATH_FIXED) || | |
a8d418d9 JH |
532 | ((mpath->flags & MESH_PATH_ACTIVE) && |
533 | ((rcu_access_pointer(mpath->next_hop) != sta ? | |
534 | mult_frac(last_hop_metric, 10, 9) : | |
535 | last_hop_metric) > mpath->metric))) | |
050ac52c LCC |
536 | fresh_info = false; |
537 | } else { | |
ae76eef0 BC |
538 | mpath = mesh_path_add(sdata, ta); |
539 | if (IS_ERR(mpath)) { | |
050ac52c | 540 | rcu_read_unlock(); |
050ac52c LCC |
541 | return 0; |
542 | } | |
543 | spin_lock_bh(&mpath->state_lock); | |
544 | } | |
545 | ||
546 | if (fresh_info) { | |
d5edb9ae | 547 | if (rcu_access_pointer(mpath->next_hop) != sta) { |
540bbcb9 | 548 | mpath->path_change_count++; |
d5edb9ae FF |
549 | flush_mpath = true; |
550 | } | |
050ac52c | 551 | mesh_path_assign_nexthop(mpath, sta); |
050ac52c LCC |
552 | mpath->metric = last_hop_metric; |
553 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
554 | ? mpath->exp_time : exp_time; | |
cc241636 | 555 | mpath->hop_count = 1; |
050ac52c LCC |
556 | mesh_path_activate(mpath); |
557 | spin_unlock_bh(&mpath->state_lock); | |
d5edb9ae FF |
558 | if (flush_mpath) |
559 | mesh_fast_tx_flush_mpath(mpath); | |
3eb0928f MR |
560 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
561 | /* init it at a low value - 0 start is tricky */ | |
562 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
563 | mesh_path_tx_pending(mpath); |
564 | } else | |
565 | spin_unlock_bh(&mpath->state_lock); | |
566 | } | |
567 | ||
050ac52c LCC |
568 | rcu_read_unlock(); |
569 | ||
570 | return process ? new_metric : 0; | |
571 | } | |
572 | ||
f698d856 | 573 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 574 | struct ieee80211_mgmt *mgmt, |
5ec596c4 | 575 | const u8 *preq_elem, u32 orig_metric) |
57ef5ddb | 576 | { |
472dbc45 | 577 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 578 | struct mesh_path *mpath = NULL; |
4a3cb702 | 579 | const u8 *target_addr, *orig_addr; |
3d045a54 | 580 | const u8 *da; |
3fbf4b71 | 581 | u8 target_flags, ttl, flags; |
b4201cc4 | 582 | u32 orig_sn, target_sn, lifetime, target_metric = 0; |
050ac52c LCC |
583 | bool reply = false; |
584 | bool forward = true; | |
3fbf4b71 | 585 | bool root_is_gate; |
050ac52c | 586 | |
d19b3bf6 RP |
587 | /* Update target SN, if present */ |
588 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 589 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
590 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
591 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
592 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
593 | /* Proactive PREQ gate announcements */ |
594 | flags = PREQ_IE_FLAGS(preq_elem); | |
595 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 596 | |
bdcbd8e0 | 597 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 598 | |
b203ca39 | 599 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 600 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
601 | forward = false; |
602 | reply = true; | |
5ec596c4 | 603 | target_metric = 0; |
1f631c32 YCP |
604 | |
605 | if (SN_GT(target_sn, ifmsh->sn)) | |
606 | ifmsh->sn = target_sn; | |
607 | ||
d19b3bf6 | 608 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 609 | net_traversal_jiffies(sdata)) || |
d19b3bf6 | 610 | time_before(jiffies, ifmsh->last_sn_update)) { |
bc3ce0b0 | 611 | ++ifmsh->sn; |
d19b3bf6 | 612 | ifmsh->last_sn_update = jiffies; |
050ac52c | 613 | } |
bc3ce0b0 | 614 | target_sn = ifmsh->sn; |
3fbf4b71 CYY |
615 | } else if (is_broadcast_ether_addr(target_addr) && |
616 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
617 | rcu_read_lock(); | |
bf7cd94d | 618 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
619 | if (mpath) { |
620 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
621 | reply = true; | |
622 | target_addr = sdata->vif.addr; | |
623 | target_sn = ++ifmsh->sn; | |
5ec596c4 | 624 | target_metric = 0; |
3fbf4b71 CYY |
625 | ifmsh->last_sn_update = jiffies; |
626 | } | |
627 | if (root_is_gate) | |
628 | mesh_path_add_gate(mpath); | |
629 | } | |
630 | rcu_read_unlock(); | |
050ac52c LCC |
631 | } else { |
632 | rcu_read_lock(); | |
bf7cd94d | 633 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 634 | if (mpath) { |
d19b3bf6 RP |
635 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
636 | SN_LT(mpath->sn, target_sn)) { | |
637 | mpath->sn = target_sn; | |
638 | mpath->flags |= MESH_PATH_SN_VALID; | |
932e628d | 639 | } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
050ac52c LCC |
640 | (mpath->flags & MESH_PATH_ACTIVE)) { |
641 | reply = true; | |
5ec596c4 | 642 | target_metric = mpath->metric; |
d19b3bf6 | 643 | target_sn = mpath->sn; |
932e628d CYY |
644 | /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
645 | target_flags |= IEEE80211_PREQ_TO_FLAG; | |
050ac52c LCC |
646 | } |
647 | } | |
648 | rcu_read_unlock(); | |
649 | } | |
650 | ||
651 | if (reply) { | |
652 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 653 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 654 | if (ttl != 0) { |
bdcbd8e0 | 655 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 | 656 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
f63f8421 CYY |
657 | orig_sn, 0, target_addr, |
658 | target_sn, mgmt->sa, 0, ttl, | |
5ec596c4 AG |
659 | lifetime, target_metric, 0, |
660 | sdata); | |
3fbf4b71 | 661 | } else { |
472dbc45 | 662 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 663 | } |
050ac52c LCC |
664 | } |
665 | ||
94f90656 | 666 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 667 | u32 preq_id; |
3fbf4b71 | 668 | u8 hopcount; |
050ac52c LCC |
669 | |
670 | ttl = PREQ_IE_TTL(preq_elem); | |
671 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
672 | if (ttl <= 1) { | |
472dbc45 | 673 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
674 | return; |
675 | } | |
bdcbd8e0 | 676 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 677 | --ttl; |
050ac52c LCC |
678 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
679 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
680 | da = (mpath && mpath->is_root) ? |
681 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
682 | |
683 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
684 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
685 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
3fbf4b71 CYY |
686 | } |
687 | ||
050ac52c | 688 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
f63f8421 CYY |
689 | orig_sn, target_flags, target_addr, |
690 | target_sn, da, hopcount, ttl, lifetime, | |
5ec596c4 | 691 | orig_metric, preq_id, sdata); |
7d4e15b1 CYY |
692 | if (!is_multicast_ether_addr(da)) |
693 | ifmsh->mshstats.fwded_unicast++; | |
694 | else | |
695 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 696 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
697 | } |
698 | } | |
699 | ||
700 | ||
40b275b6 JB |
701 | static inline struct sta_info * |
702 | next_hop_deref_protected(struct mesh_path *mpath) | |
703 | { | |
704 | return rcu_dereference_protected(mpath->next_hop, | |
705 | lockdep_is_held(&mpath->state_lock)); | |
706 | } | |
707 | ||
708 | ||
f698d856 | 709 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 710 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 711 | const u8 *prep_elem, u32 metric) |
050ac52c | 712 | { |
d665508b | 713 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 714 | struct mesh_path *mpath; |
4a3cb702 | 715 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
716 | u8 ttl, hopcount, flags; |
717 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 718 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 719 | |
bdcbd8e0 | 720 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 721 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 722 | |
3c26f1f6 | 723 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 724 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
725 | /* destination, no forwarding required */ |
726 | return; | |
727 | ||
d665508b CYY |
728 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
729 | return; | |
730 | ||
050ac52c LCC |
731 | ttl = PREP_IE_TTL(prep_elem); |
732 | if (ttl <= 1) { | |
472dbc45 | 733 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
734 | return; |
735 | } | |
736 | ||
737 | rcu_read_lock(); | |
bf7cd94d | 738 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
739 | if (mpath) |
740 | spin_lock_bh(&mpath->state_lock); | |
741 | else | |
742 | goto fail; | |
743 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
744 | spin_unlock_bh(&mpath->state_lock); | |
745 | goto fail; | |
746 | } | |
40b275b6 | 747 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
748 | spin_unlock_bh(&mpath->state_lock); |
749 | --ttl; | |
750 | flags = PREP_IE_FLAGS(prep_elem); | |
751 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
752 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 753 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
754 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
755 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c | 756 | |
f63f8421 CYY |
757 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
758 | target_addr, target_sn, next_hop, hopcount, | |
759 | ttl, lifetime, metric, 0, sdata); | |
050ac52c | 760 | rcu_read_unlock(); |
c8a61a7d DW |
761 | |
762 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 763 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
764 | return; |
765 | ||
766 | fail: | |
767 | rcu_read_unlock(); | |
472dbc45 | 768 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
769 | } |
770 | ||
f698d856 | 771 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
772 | struct ieee80211_mgmt *mgmt, |
773 | const u8 *perr_elem) | |
050ac52c | 774 | { |
d611f062 | 775 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 776 | struct mesh_path *mpath; |
d611f062 | 777 | u8 ttl; |
4a3cb702 | 778 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
779 | u32 target_sn; |
780 | u16 target_rcode; | |
050ac52c LCC |
781 | |
782 | ta = mgmt->sa; | |
d611f062 RP |
783 | ttl = PERR_IE_TTL(perr_elem); |
784 | if (ttl <= 1) { | |
785 | ifmsh->mshstats.dropped_frames_ttl++; | |
786 | return; | |
787 | } | |
788 | ttl--; | |
d19b3bf6 RP |
789 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
790 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
791 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 792 | |
050ac52c | 793 | rcu_read_lock(); |
bf7cd94d | 794 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 795 | if (mpath) { |
888d04df FF |
796 | struct sta_info *sta; |
797 | ||
050ac52c | 798 | spin_lock_bh(&mpath->state_lock); |
888d04df | 799 | sta = next_hop_deref_protected(mpath); |
050ac52c | 800 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 801 | ether_addr_equal(ta, sta->sta.addr) && |
5df20f21 | 802 | !(mpath->flags & MESH_PATH_FIXED) && |
d19b3bf6 | 803 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
703ee73a | 804 | SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
050ac52c | 805 | mpath->flags &= ~MESH_PATH_ACTIVE; |
703ee73a AG |
806 | if (target_sn != 0) |
807 | mpath->sn = target_sn; | |
808 | else | |
809 | mpath->sn += 1; | |
050ac52c | 810 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
811 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
812 | goto endperr; | |
bf7cd94d | 813 | mesh_path_error_tx(sdata, ttl, target_addr, |
f63f8421 | 814 | target_sn, target_rcode, |
bf7cd94d | 815 | broadcast_addr); |
050ac52c LCC |
816 | } else |
817 | spin_unlock_bh(&mpath->state_lock); | |
818 | } | |
d665508b | 819 | endperr: |
050ac52c LCC |
820 | rcu_read_unlock(); |
821 | } | |
822 | ||
90a5e169 | 823 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
824 | struct ieee80211_mgmt *mgmt, |
825 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
826 | { |
827 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
828 | struct ieee80211_local *local = sdata->local; |
829 | struct sta_info *sta; | |
90a5e169 | 830 | struct mesh_path *mpath; |
90a5e169 | 831 | u8 ttl, flags, hopcount; |
4a3cb702 | 832 | const u8 *orig_addr; |
fbbdad5e | 833 | u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval; |
5ee68e5b | 834 | bool root_is_gate; |
90a5e169 | 835 | |
90a5e169 | 836 | ttl = rann->rann_ttl; |
90a5e169 | 837 | flags = rann->rann_flags; |
5ee68e5b | 838 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 839 | orig_addr = rann->rann_addr; |
292c41ac | 840 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 841 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 842 | hopcount = rann->rann_hopcount; |
a6a58b4f | 843 | hopcount++; |
fbbdad5e | 844 | orig_metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
845 | |
846 | /* Ignore our own RANNs */ | |
b203ca39 | 847 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
848 | return; |
849 | ||
bdcbd8e0 JB |
850 | mhwmp_dbg(sdata, |
851 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
852 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
853 | |
854 | rcu_read_lock(); | |
d2a079fd CYY |
855 | sta = sta_info_get(sdata, mgmt->sa); |
856 | if (!sta) { | |
857 | rcu_read_unlock(); | |
858 | return; | |
859 | } | |
860 | ||
fbbdad5e CYY |
861 | last_hop_metric = airtime_link_metric_get(local, sta); |
862 | new_metric = orig_metric + last_hop_metric; | |
863 | if (new_metric < orig_metric) | |
864 | new_metric = MAX_METRIC; | |
d2a079fd | 865 | |
bf7cd94d | 866 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 867 | if (!mpath) { |
ae76eef0 BC |
868 | mpath = mesh_path_add(sdata, orig_addr); |
869 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
870 | rcu_read_unlock(); |
871 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
872 | return; | |
873 | } | |
90a5e169 | 874 | } |
5ee68e5b | 875 | |
7ebfa469 | 876 | if (!(SN_LT(mpath->sn, orig_sn)) && |
fbbdad5e | 877 | !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) { |
7ebfa469 CYY |
878 | rcu_read_unlock(); |
879 | return; | |
880 | } | |
881 | ||
5ee68e5b | 882 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
883 | (time_after(jiffies, mpath->last_preq_to_root + |
884 | root_path_confirmation_jiffies(sdata)) || | |
885 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 886 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
887 | mhwmp_dbg(sdata, |
888 | "time to refresh root mpath %pM\n", | |
889 | orig_addr); | |
5ee68e5b | 890 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 891 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
892 | } |
893 | ||
7ebfa469 | 894 | mpath->sn = orig_sn; |
fbbdad5e | 895 | mpath->rann_metric = new_metric; |
7ebfa469 CYY |
896 | mpath->is_root = true; |
897 | /* Recording RANNs sender address to send individually | |
898 | * addressed PREQs destined for root mesh STA */ | |
899 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
900 | ||
901 | if (root_is_gate) | |
902 | mesh_path_add_gate(mpath); | |
903 | ||
904 | if (ttl <= 1) { | |
905 | ifmsh->mshstats.dropped_frames_ttl++; | |
906 | rcu_read_unlock(); | |
907 | return; | |
908 | } | |
909 | ttl--; | |
910 | ||
911 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 912 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
f63f8421 CYY |
913 | orig_sn, 0, NULL, 0, broadcast_addr, |
914 | hopcount, ttl, interval, | |
fbbdad5e | 915 | new_metric, 0, sdata); |
90a5e169 | 916 | } |
3d045a54 | 917 | |
90a5e169 RP |
918 | rcu_read_unlock(); |
919 | } | |
050ac52c LCC |
920 | |
921 | ||
f698d856 | 922 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 923 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c | 924 | { |
5d24828d | 925 | struct ieee802_11_elems *elems; |
050ac52c | 926 | size_t baselen; |
afd2efb9 | 927 | u32 path_metric; |
97091317 | 928 | struct sta_info *sta; |
050ac52c | 929 | |
9c80d3dc JB |
930 | /* need action_code */ |
931 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
932 | return; | |
933 | ||
97091317 JC |
934 | rcu_read_lock(); |
935 | sta = sta_info_get(sdata, mgmt->sa); | |
433f5bc1 | 936 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
97091317 JC |
937 | rcu_read_unlock(); |
938 | return; | |
939 | } | |
940 | rcu_read_unlock(); | |
941 | ||
050ac52c | 942 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
5d24828d | 943 | elems = ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, |
38c6aa29 | 944 | len - baselen, false, NULL); |
5d24828d JB |
945 | if (!elems) |
946 | return; | |
050ac52c | 947 | |
5d24828d JB |
948 | if (elems->preq) { |
949 | if (elems->preq_len != 37) | |
050ac52c | 950 | /* Right now we support just 1 destination and no AE */ |
5d24828d JB |
951 | goto free; |
952 | path_metric = hwmp_route_info_get(sdata, mgmt, elems->preq, | |
afd2efb9 AG |
953 | MPATH_PREQ); |
954 | if (path_metric) | |
5d24828d | 955 | hwmp_preq_frame_process(sdata, mgmt, elems->preq, |
afd2efb9 | 956 | path_metric); |
dbb81c42 | 957 | } |
5d24828d JB |
958 | if (elems->prep) { |
959 | if (elems->prep_len != 31) | |
050ac52c | 960 | /* Right now we support no AE */ |
5d24828d JB |
961 | goto free; |
962 | path_metric = hwmp_route_info_get(sdata, mgmt, elems->prep, | |
afd2efb9 AG |
963 | MPATH_PREP); |
964 | if (path_metric) | |
5d24828d | 965 | hwmp_prep_frame_process(sdata, mgmt, elems->prep, |
afd2efb9 | 966 | path_metric); |
dbb81c42 | 967 | } |
5d24828d JB |
968 | if (elems->perr) { |
969 | if (elems->perr_len != 15) | |
050ac52c | 970 | /* Right now we support only one destination per PERR */ |
5d24828d JB |
971 | goto free; |
972 | hwmp_perr_frame_process(sdata, mgmt, elems->perr); | |
050ac52c | 973 | } |
5d24828d JB |
974 | if (elems->rann) |
975 | hwmp_rann_frame_process(sdata, mgmt, elems->rann); | |
976 | free: | |
977 | kfree(elems); | |
050ac52c LCC |
978 | } |
979 | ||
980 | /** | |
981 | * mesh_queue_preq - queue a PREQ to a given destination | |
982 | * | |
983 | * @mpath: mesh path to discover | |
984 | * @flags: special attributes of the PREQ to be sent | |
985 | * | |
986 | * Locking: the function must be called from within a rcu read lock block. | |
987 | * | |
988 | */ | |
989 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
990 | { | |
f698d856 | 991 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 992 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
993 | struct mesh_preq_queue *preq_node; |
994 | ||
59615b5f | 995 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 996 | if (!preq_node) { |
bdcbd8e0 | 997 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
998 | return; |
999 | } | |
1000 | ||
987dafad | 1001 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 1002 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 1003 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1004 | kfree(preq_node); |
1005 | if (printk_ratelimit()) | |
bdcbd8e0 | 1006 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
1007 | return; |
1008 | } | |
1009 | ||
f2dc7989 | 1010 | spin_lock(&mpath->state_lock); |
f3011cf9 | 1011 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 1012 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 1013 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 1014 | kfree(preq_node); |
f3011cf9 JC |
1015 | return; |
1016 | } | |
1017 | ||
050ac52c LCC |
1018 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
1019 | preq_node->flags = flags; | |
1020 | ||
f3011cf9 | 1021 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 1022 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 1023 | |
472dbc45 JB |
1024 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
1025 | ++ifmsh->preq_queue_len; | |
987dafad | 1026 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 1027 | |
472dbc45 | 1028 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
16114496 | 1029 | wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); |
050ac52c | 1030 | |
472dbc45 | 1031 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
1032 | /* avoid long wait if did not send preqs for a long time |
1033 | * and jiffies wrapped around | |
1034 | */ | |
472dbc45 | 1035 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
16114496 | 1036 | wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); |
050ac52c | 1037 | } else |
472dbc45 | 1038 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
1039 | min_preq_int_jiff(sdata)); |
1040 | } | |
1041 | ||
1042 | /** | |
1043 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
1044 | * | |
f698d856 | 1045 | * @sdata: local mesh subif |
050ac52c | 1046 | */ |
f698d856 | 1047 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 1048 | { |
472dbc45 | 1049 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
1050 | struct mesh_preq_queue *preq_node; |
1051 | struct mesh_path *mpath; | |
932e628d | 1052 | u8 ttl, target_flags = 0; |
3d045a54 | 1053 | const u8 *da; |
050ac52c LCC |
1054 | u32 lifetime; |
1055 | ||
a43816df | 1056 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
1057 | if (!ifmsh->preq_queue_len || |
1058 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 1059 | min_preq_int_jiff(sdata))) { |
a43816df | 1060 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1061 | return; |
1062 | } | |
1063 | ||
472dbc45 | 1064 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
1065 | struct mesh_preq_queue, list); |
1066 | list_del(&preq_node->list); | |
472dbc45 | 1067 | --ifmsh->preq_queue_len; |
a43816df | 1068 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1069 | |
1070 | rcu_read_lock(); | |
bf7cd94d | 1071 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
1072 | if (!mpath) |
1073 | goto enddiscovery; | |
1074 | ||
1075 | spin_lock_bh(&mpath->state_lock); | |
5df20f21 | 1076 | if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { |
74932959 BC |
1077 | spin_unlock_bh(&mpath->state_lock); |
1078 | goto enddiscovery; | |
1079 | } | |
f3011cf9 | 1080 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1081 | if (preq_node->flags & PREQ_Q_F_START) { |
1082 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1083 | spin_unlock_bh(&mpath->state_lock); | |
1084 | goto enddiscovery; | |
1085 | } else { | |
1086 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1087 | mpath->flags |= MESH_PATH_RESOLVING; | |
1088 | mpath->discovery_retries = 0; | |
1089 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1090 | } | |
1091 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1092 | mpath->flags & MESH_PATH_RESOLVED) { | |
1093 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1094 | spin_unlock_bh(&mpath->state_lock); | |
1095 | goto enddiscovery; | |
1096 | } | |
1097 | ||
472dbc45 | 1098 | ifmsh->last_preq = jiffies; |
050ac52c | 1099 | |
d19b3bf6 | 1100 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1101 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1102 | time_before(jiffies, ifmsh->last_sn_update)) { |
1103 | ++ifmsh->sn; | |
1104 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1105 | } |
1106 | lifetime = default_lifetime(sdata); | |
45904f21 | 1107 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1108 | if (ttl == 0) { |
472dbc45 | 1109 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1110 | spin_unlock_bh(&mpath->state_lock); |
1111 | goto enddiscovery; | |
1112 | } | |
1113 | ||
1114 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
932e628d | 1115 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
050ac52c | 1116 | else |
932e628d | 1117 | target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
050ac52c LCC |
1118 | |
1119 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1120 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
f63f8421 CYY |
1121 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
1122 | target_flags, mpath->dst, mpath->sn, da, 0, | |
1123 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); | |
e2d4a80f LL |
1124 | |
1125 | spin_lock_bh(&mpath->state_lock); | |
01da2e05 PM |
1126 | if (!(mpath->flags & MESH_PATH_DELETED)) |
1127 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); | |
e2d4a80f | 1128 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1129 | |
1130 | enddiscovery: | |
1131 | rcu_read_unlock(); | |
1132 | kfree(preq_node); | |
1133 | } | |
1134 | ||
2c53040f BH |
1135 | /** |
1136 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1137 | * |
e32f85f7 | 1138 | * @skb: 802.11 frame to be sent |
f698d856 | 1139 | * @sdata: network subif the frame will be sent through |
050ac52c | 1140 | * |
2c53040f BH |
1141 | * Lookup next hop for given skb and start path discovery if no |
1142 | * forwarding information is found. | |
1143 | * | |
0cfda851 | 1144 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
ab4040df | 1145 | * skb is freed here if no mpath could be allocated. |
050ac52c | 1146 | */ |
bf7cd94d JB |
1147 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1148 | struct sk_buff *skb) | |
050ac52c | 1149 | { |
e32f85f7 | 1150 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1151 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1152 | struct mesh_path *mpath; | |
1153 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1154 | u8 *target_addr = hdr->addr3; |
050ac52c | 1155 | |
3f52b7e3 MP |
1156 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1157 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1158 | return 0; | |
1159 | ||
8828f81a RM |
1160 | /* Allow injected packets to bypass mesh routing */ |
1161 | if (info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) | |
1162 | return 0; | |
1163 | ||
ef618b1b FF |
1164 | if (!mesh_nexthop_lookup(sdata, skb)) |
1165 | return 0; | |
050ac52c | 1166 | |
0cfda851 | 1167 | /* no nexthop found, start resolving */ |
bf7cd94d | 1168 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1169 | if (!mpath) { |
ae76eef0 BC |
1170 | mpath = mesh_path_add(sdata, target_addr); |
1171 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1172 | mesh_path_discard_frame(sdata, skb); |
ef618b1b | 1173 | return PTR_ERR(mpath); |
050ac52c LCC |
1174 | } |
1175 | } | |
1176 | ||
ba32679c NC |
1177 | if (!(mpath->flags & MESH_PATH_RESOLVING) && |
1178 | mesh_path_sel_is_hwmp(sdata)) | |
0cfda851 TP |
1179 | mesh_queue_preq(mpath, PREQ_Q_F_START); |
1180 | ||
1181 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1182 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1183 | ||
cc20ff2c | 1184 | info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
0cfda851 TP |
1185 | ieee80211_set_qos_hdr(sdata, skb); |
1186 | skb_queue_tail(&mpath->frame_queue, skb); | |
0cfda851 | 1187 | if (skb_to_free) |
bf7cd94d | 1188 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 | 1189 | |
ef618b1b | 1190 | return -ENOENT; |
0cfda851 | 1191 | } |
bf7cd94d | 1192 | |
e3718a61 LL |
1193 | /** |
1194 | * mesh_nexthop_lookup_nolearn - try to set next hop without path discovery | |
1195 | * @skb: 802.11 frame to be sent | |
1196 | * @sdata: network subif the frame will be sent through | |
1197 | * | |
1198 | * Check if the meshDA (addr3) of a unicast frame is a direct neighbor. | |
1199 | * And if so, set the RA (addr1) to it to transmit to this node directly, | |
1200 | * avoiding PREQ/PREP path discovery. | |
1201 | * | |
1202 | * Returns: 0 if the next hop was found and -ENOENT otherwise. | |
1203 | */ | |
1204 | static int mesh_nexthop_lookup_nolearn(struct ieee80211_sub_if_data *sdata, | |
1205 | struct sk_buff *skb) | |
1206 | { | |
1207 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
1208 | struct sta_info *sta; | |
1209 | ||
1210 | if (is_multicast_ether_addr(hdr->addr1)) | |
1211 | return -ENOENT; | |
1212 | ||
1213 | rcu_read_lock(); | |
1214 | sta = sta_info_get(sdata, hdr->addr3); | |
1215 | ||
1216 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { | |
1217 | rcu_read_unlock(); | |
1218 | return -ENOENT; | |
1219 | } | |
1220 | rcu_read_unlock(); | |
1221 | ||
1222 | memcpy(hdr->addr1, hdr->addr3, ETH_ALEN); | |
1223 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1224 | return 0; | |
1225 | } | |
1226 | ||
d5edb9ae FF |
1227 | void mesh_path_refresh(struct ieee80211_sub_if_data *sdata, |
1228 | struct mesh_path *mpath, const u8 *addr) | |
1229 | { | |
1230 | if (mpath->flags & (MESH_PATH_REQ_QUEUED | MESH_PATH_FIXED | | |
1231 | MESH_PATH_RESOLVING)) | |
1232 | return; | |
1233 | ||
1234 | if (time_after(jiffies, | |
1235 | mpath->exp_time - | |
1236 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
1237 | (!addr || ether_addr_equal(sdata->vif.addr, addr))) | |
1238 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
1239 | } | |
1240 | ||
0cfda851 TP |
1241 | /** |
1242 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1243 | * this function is considered "using" the associated mpath, so preempt a path | |
1244 | * refresh if this mpath expires soon. | |
1245 | * | |
1246 | * @skb: 802.11 frame to be sent | |
1247 | * @sdata: network subif the frame will be sent through | |
1248 | * | |
1249 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1250 | */ | |
bf7cd94d JB |
1251 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1252 | struct sk_buff *skb) | |
0cfda851 | 1253 | { |
e3718a61 | 1254 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
0cfda851 TP |
1255 | struct mesh_path *mpath; |
1256 | struct sta_info *next_hop; | |
1257 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1258 | u8 *target_addr = hdr->addr3; | |
050ac52c | 1259 | |
e3718a61 LL |
1260 | if (ifmsh->mshcfg.dot11MeshNolearn && |
1261 | !mesh_nexthop_lookup_nolearn(sdata, skb)) | |
1262 | return 0; | |
1263 | ||
bf7cd94d | 1264 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 | 1265 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) |
ef618b1b | 1266 | return -ENOENT; |
0cfda851 | 1267 | |
d5edb9ae | 1268 | mesh_path_refresh(sdata, mpath, hdr->addr4); |
050ac52c | 1269 | |
0cfda851 TP |
1270 | next_hop = rcu_dereference(mpath->next_hop); |
1271 | if (next_hop) { | |
1272 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1273 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
3f52b7e3 | 1274 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
d5edb9ae FF |
1275 | if (ieee80211_hw_check(&sdata->local->hw, SUPPORT_FAST_XMIT)) |
1276 | mesh_fast_tx_cache(sdata, skb, mpath); | |
ef618b1b | 1277 | return 0; |
050ac52c LCC |
1278 | } |
1279 | ||
ef618b1b | 1280 | return -ENOENT; |
050ac52c LCC |
1281 | } |
1282 | ||
34f11cd3 | 1283 | void mesh_path_timer(struct timer_list *t) |
050ac52c | 1284 | { |
34f11cd3 | 1285 | struct mesh_path *mpath = from_timer(mpath, t, timer); |
dea4096b | 1286 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
5ee68e5b | 1287 | int ret; |
5bb644a0 | 1288 | |
dea4096b | 1289 | if (sdata->local->quiescing) |
5bb644a0 | 1290 | return; |
5bb644a0 JB |
1291 | |
1292 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1293 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1294 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1295 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1296 | spin_unlock_bh(&mpath->state_lock); |
1297 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1298 | ++mpath->discovery_retries; |
1299 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1300 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1301 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1302 | mesh_queue_preq(mpath, 0); |
1303 | } else { | |
d8254710 JJ |
1304 | mpath->flags &= ~(MESH_PATH_RESOLVING | |
1305 | MESH_PATH_RESOLVED | | |
1306 | MESH_PATH_REQ_QUEUED); | |
050ac52c | 1307 | mpath->exp_time = jiffies; |
5ee68e5b JC |
1308 | spin_unlock_bh(&mpath->state_lock); |
1309 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1310 | ret = mesh_path_send_to_gates(mpath); | |
1311 | if (ret) | |
bdcbd8e0 | 1312 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1313 | } else |
1314 | mesh_path_flush_pending(mpath); | |
050ac52c | 1315 | } |
050ac52c | 1316 | } |
e304bfd3 | 1317 | |
bf7cd94d | 1318 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
1319 | { |
1320 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1321 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1322 | u8 flags, target_flags = 0; |
e304bfd3 | 1323 | |
16dd7267 JC |
1324 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1325 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1326 | |
1327 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1328 | case IEEE80211_PROACTIVE_RANN: | |
1329 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
f63f8421 CYY |
1330 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
1331 | 0, ifmsh->mshcfg.element_ttl, | |
1332 | interval, 0, 0, sdata); | |
a69cc44f CYY |
1333 | break; |
1334 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1335 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
fc0561dc | 1336 | fallthrough; |
a69cc44f CYY |
1337 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: |
1338 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1339 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1340 | IEEE80211_PREQ_USN_FLAG; | |
1341 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
f63f8421 CYY |
1342 | ++ifmsh->sn, target_flags, |
1343 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1344 | 0, ifmsh->mshcfg.element_ttl, interval, | |
1345 | 0, ifmsh->preq_id++, sdata); | |
a69cc44f CYY |
1346 | break; |
1347 | default: | |
bdcbd8e0 | 1348 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1349 | return; |
1350 | } | |
e304bfd3 | 1351 | } |