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050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
888d04df | 11 | #include <linux/etherdevice.h> |
d26ad377 | 12 | #include <asm/unaligned.h> |
2cca397f | 13 | #include "wme.h" |
050ac52c LCC |
14 | #include "mesh.h" |
15 | ||
050ac52c LCC |
16 | #define TEST_FRAME_LEN 8192 |
17 | #define MAX_METRIC 0xffffffff | |
18 | #define ARITH_SHIFT 8 | |
fe56c9c1 | 19 | #define LINK_FAIL_THRESH 95 |
050ac52c | 20 | |
050ac52c LCC |
21 | #define MAX_PREQ_QUEUE_LEN 64 |
22 | ||
90a5e169 RP |
23 | static void mesh_queue_preq(struct mesh_path *, u8); |
24 | ||
4a3cb702 | 25 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
a00de5d0 LCC |
26 | { |
27 | if (ae) | |
28 | offset += 6; | |
ae7245cb | 29 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
30 | } |
31 | ||
aee6499c | 32 | static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
d611f062 RP |
33 | { |
34 | if (ae) | |
35 | offset += 6; | |
36 | return get_unaligned_le16(preq_elem + offset); | |
37 | } | |
38 | ||
050ac52c | 39 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
40 | #define AE_F (1<<6) |
41 | #define AE_F_SET(x) (*x & AE_F) | |
42 | #define PREQ_IE_FLAGS(x) (*(x)) | |
43 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
44 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
45 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
46 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
47 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
48 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
49 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
50 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
51 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 52 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
53 | |
54 | ||
55 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
56 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
57 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
58 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
59 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
60 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
61 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
62 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
63 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 64 | |
d611f062 | 65 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
66 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
67 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
68 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
69 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 70 | |
050ac52c | 71 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
72 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
73 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
d8f0300a JJ |
74 | #define MAX_SANE_SN_DELTA 32 |
75 | ||
76 | static inline u32 SN_DELTA(u32 x, u32 y) | |
77 | { | |
78 | return x >= y ? x - y : y - x; | |
79 | } | |
050ac52c LCC |
80 | |
81 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 82 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 83 | #define default_lifetime(s) \ |
472dbc45 | 84 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 85 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
86 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
87 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 88 | #define disc_timeout_jiff(s) \ |
472dbc45 | 89 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
90 | #define root_path_confirmation_jiffies(s) \ |
91 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
92 | |
93 | enum mpath_frame_type { | |
94 | MPATH_PREQ = 0, | |
95 | MPATH_PREP, | |
90a5e169 RP |
96 | MPATH_PERR, |
97 | MPATH_RANN | |
050ac52c LCC |
98 | }; |
99 | ||
15ff6365 JB |
100 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
101 | ||
050ac52c | 102 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
f63f8421 | 103 | const u8 *orig_addr, u32 orig_sn, |
4a3cb702 | 104 | u8 target_flags, const u8 *target, |
f63f8421 | 105 | u32 target_sn, const u8 *da, |
4a3cb702 | 106 | u8 hop_count, u8 ttl, |
f63f8421 | 107 | u32 lifetime, u32 metric, u32 preq_id, |
4a3cb702 | 108 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 109 | { |
f698d856 | 110 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 111 | struct sk_buff *skb; |
050ac52c | 112 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 | 113 | u8 *pos, ie_len; |
4c121fd6 JB |
114 | int hdr_len = offsetofend(struct ieee80211_mgmt, |
115 | u.action.u.mesh_action); | |
050ac52c | 116 | |
65e8b0cc | 117 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
118 | hdr_len + |
119 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
120 | if (!skb) |
121 | return -1; | |
65e8b0cc | 122 | skb_reserve(skb, local->tx_headroom); |
b080db58 | 123 | mgmt = skb_put_zero(skb, hdr_len); |
e7827a70 HH |
124 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
125 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
126 | |
127 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 128 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 129 | /* BSSID == SA */ |
47846c9b | 130 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
131 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
132 | mgmt->u.action.u.mesh_action.action_code = | |
133 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
134 | |
135 | switch (action) { | |
136 | case MPATH_PREQ: | |
bdcbd8e0 | 137 | mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); |
050ac52c LCC |
138 | ie_len = 37; |
139 | pos = skb_put(skb, 2 + ie_len); | |
140 | *pos++ = WLAN_EID_PREQ; | |
141 | break; | |
142 | case MPATH_PREP: | |
0f71651f | 143 | mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
050ac52c LCC |
144 | ie_len = 31; |
145 | pos = skb_put(skb, 2 + ie_len); | |
146 | *pos++ = WLAN_EID_PREP; | |
147 | break; | |
90a5e169 | 148 | case MPATH_RANN: |
bdcbd8e0 | 149 | mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
90a5e169 RP |
150 | ie_len = sizeof(struct ieee80211_rann_ie); |
151 | pos = skb_put(skb, 2 + ie_len); | |
152 | *pos++ = WLAN_EID_RANN; | |
153 | break; | |
050ac52c | 154 | default: |
812714d7 | 155 | kfree_skb(skb); |
050ac52c | 156 | return -ENOTSUPP; |
050ac52c LCC |
157 | } |
158 | *pos++ = ie_len; | |
159 | *pos++ = flags; | |
160 | *pos++ = hop_count; | |
161 | *pos++ = ttl; | |
25d49e4d TP |
162 | if (action == MPATH_PREP) { |
163 | memcpy(pos, target, ETH_ALEN); | |
164 | pos += ETH_ALEN; | |
f63f8421 | 165 | put_unaligned_le32(target_sn, pos); |
050ac52c | 166 | pos += 4; |
25d49e4d TP |
167 | } else { |
168 | if (action == MPATH_PREQ) { | |
f63f8421 | 169 | put_unaligned_le32(preq_id, pos); |
25d49e4d TP |
170 | pos += 4; |
171 | } | |
172 | memcpy(pos, orig_addr, ETH_ALEN); | |
173 | pos += ETH_ALEN; | |
f63f8421 | 174 | put_unaligned_le32(orig_sn, pos); |
90a5e169 RP |
175 | pos += 4; |
176 | } | |
f63f8421 | 177 | put_unaligned_le32(lifetime, pos); /* interval for RANN */ |
25d49e4d | 178 | pos += 4; |
f63f8421 | 179 | put_unaligned_le32(metric, pos); |
050ac52c LCC |
180 | pos += 4; |
181 | if (action == MPATH_PREQ) { | |
25d49e4d | 182 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 183 | *pos++ = target_flags; |
d19b3bf6 | 184 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 185 | pos += ETH_ALEN; |
f63f8421 | 186 | put_unaligned_le32(target_sn, pos); |
25d49e4d TP |
187 | pos += 4; |
188 | } else if (action == MPATH_PREP) { | |
189 | memcpy(pos, orig_addr, ETH_ALEN); | |
190 | pos += ETH_ALEN; | |
f63f8421 | 191 | put_unaligned_le32(orig_sn, pos); |
25d49e4d | 192 | pos += 4; |
90a5e169 | 193 | } |
050ac52c | 194 | |
62ae67be | 195 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
196 | return 0; |
197 | } | |
198 | ||
2cca397f JC |
199 | |
200 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
201 | * headroom in case the frame is encrypted. */ | |
202 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
203 | struct sk_buff *skb) | |
204 | { | |
2cca397f | 205 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
3f52b7e3 | 206 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
2cca397f | 207 | |
d57a544d ZS |
208 | skb_reset_mac_header(skb); |
209 | skb_reset_network_header(skb); | |
210 | skb_reset_transport_header(skb); | |
2cca397f JC |
211 | |
212 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
213 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
214 | skb->priority = 7; | |
215 | ||
216 | info->control.vif = &sdata->vif; | |
9cbbffe2 | 217 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
2154c81c | 218 | ieee80211_set_qos_hdr(sdata, skb); |
3f52b7e3 | 219 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
2cca397f JC |
220 | } |
221 | ||
050ac52c | 222 | /** |
75ea719c | 223 | * mesh_path_error_tx - Sends a PERR mesh management frame |
050ac52c | 224 | * |
75ea719c | 225 | * @ttl: allowed remaining hops |
d19b3bf6 RP |
226 | * @target: broken destination |
227 | * @target_sn: SN of the broken destination | |
228 | * @target_rcode: reason code for this PERR | |
050ac52c | 229 | * @ra: node this frame is addressed to |
75ea719c | 230 | * @sdata: local mesh subif |
2cca397f JC |
231 | * |
232 | * Note: This function may be called with driver locks taken that the driver | |
233 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
234 | * frame directly but add it to the pending queue instead. | |
050ac52c | 235 | */ |
bf7cd94d | 236 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
f63f8421 CYY |
237 | u8 ttl, const u8 *target, u32 target_sn, |
238 | u16 target_rcode, const u8 *ra) | |
050ac52c | 239 | { |
f698d856 | 240 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 241 | struct sk_buff *skb; |
dca7e943 | 242 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 243 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 | 244 | u8 *pos, ie_len; |
4c121fd6 JB |
245 | int hdr_len = offsetofend(struct ieee80211_mgmt, |
246 | u.action.u.mesh_action); | |
050ac52c | 247 | |
dca7e943 TP |
248 | if (time_before(jiffies, ifmsh->next_perr)) |
249 | return -EAGAIN; | |
250 | ||
65e8b0cc | 251 | skb = dev_alloc_skb(local->tx_headroom + |
2475b1cc | 252 | sdata->encrypt_headroom + |
8680451f | 253 | IEEE80211_ENCRYPT_TAILROOM + |
3b69a9c5 TP |
254 | hdr_len + |
255 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
256 | if (!skb) |
257 | return -1; | |
2475b1cc | 258 | skb_reserve(skb, local->tx_headroom + sdata->encrypt_headroom); |
b080db58 | 259 | mgmt = skb_put_zero(skb, hdr_len); |
e7827a70 HH |
260 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
261 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
262 | |
263 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 264 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
265 | /* BSSID == SA */ |
266 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
267 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
268 | mgmt->u.action.u.mesh_action.action_code = | |
269 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 270 | ie_len = 15; |
050ac52c LCC |
271 | pos = skb_put(skb, 2 + ie_len); |
272 | *pos++ = WLAN_EID_PERR; | |
273 | *pos++ = ie_len; | |
d611f062 | 274 | /* ttl */ |
45904f21 | 275 | *pos++ = ttl; |
050ac52c LCC |
276 | /* number of destinations */ |
277 | *pos++ = 1; | |
932e628d CYY |
278 | /* Flags field has AE bit only as defined in |
279 | * sec 8.4.2.117 IEEE802.11-2012 | |
d611f062 RP |
280 | */ |
281 | *pos = 0; | |
d611f062 | 282 | pos++; |
d19b3bf6 | 283 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 284 | pos += ETH_ALEN; |
f63f8421 | 285 | put_unaligned_le32(target_sn, pos); |
d611f062 | 286 | pos += 4; |
f63f8421 | 287 | put_unaligned_le16(target_rcode, pos); |
050ac52c | 288 | |
2cca397f JC |
289 | /* see note in function header */ |
290 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
291 | ifmsh->next_perr = TU_TO_EXP_TIME( |
292 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 293 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
294 | return 0; |
295 | } | |
296 | ||
bfc32e6a | 297 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 298 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
299 | { |
300 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
301 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
302 | int failed; | |
303 | ||
304 | if (!ieee80211_is_data(hdr->frame_control)) | |
305 | return; | |
306 | ||
307 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
308 | ||
3eb0928f MR |
309 | /* moving average, scaled to 100. |
310 | * feed failure as 100 and success as 0 | |
311 | */ | |
312 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, failed * 100); | |
fe56c9c1 MR |
313 | if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) > |
314 | LINK_FAIL_THRESH) | |
35b3fe1c | 315 | mesh_plink_broken(sta); |
bfc32e6a JC |
316 | } |
317 | ||
050ac52c LCC |
318 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
319 | struct sta_info *sta) | |
320 | { | |
6b62bf32 | 321 | struct rate_info rinfo; |
050ac52c LCC |
322 | /* This should be adjusted for each device */ |
323 | int device_constant = 1 << ARITH_SHIFT; | |
324 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
325 | int s_unit = 1 << ARITH_SHIFT; | |
326 | int rate, err; | |
327 | u32 tx_time, estimated_retx; | |
328 | u64 result; | |
3eb0928f MR |
329 | unsigned long fail_avg = |
330 | ewma_mesh_fail_avg_read(&sta->mesh->fail_avg); | |
050ac52c | 331 | |
3b17fbf8 MA |
332 | /* Try to get rate based on HW/SW RC algorithm. |
333 | * Rate is returned in units of Kbps, correct this | |
334 | * to comply with airtime calculation units | |
335 | * Round up in case we get rate < 100Kbps | |
336 | */ | |
337 | rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 100); | |
338 | ||
339 | if (rate) { | |
340 | err = 0; | |
341 | } else { | |
fe56c9c1 | 342 | if (fail_avg > LINK_FAIL_THRESH) |
3b17fbf8 | 343 | return MAX_METRIC; |
e6a9854b | 344 | |
3b17fbf8 MA |
345 | sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo); |
346 | rate = cfg80211_calculate_bitrate(&rinfo); | |
347 | if (WARN_ON(!rate)) | |
348 | return MAX_METRIC; | |
e6a9854b | 349 | |
3eb0928f | 350 | err = (fail_avg << ARITH_SHIFT) / 100; |
3b17fbf8 | 351 | } |
050ac52c LCC |
352 | |
353 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
354 | * 1Mbps. This will be corrected on tx_time computation. | |
355 | */ | |
050ac52c LCC |
356 | tx_time = (device_constant + 10 * test_frame_len / rate); |
357 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
3b17fbf8 | 358 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT); |
050ac52c LCC |
359 | return (u32)result; |
360 | } | |
361 | ||
362 | /** | |
363 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
364 | * | |
f698d856 | 365 | * @sdata: local mesh subif |
050ac52c LCC |
366 | * @mgmt: mesh management frame |
367 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 368 | * @action: type of hwmp ie |
050ac52c LCC |
369 | * |
370 | * This function updates the path routing information to the originator and the | |
f99288d1 | 371 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
372 | * |
373 | * Returns: metric to frame originator or 0 if the frame should not be further | |
374 | * processed | |
375 | * | |
376 | * Notes: this function is the only place (besides user-provided info) where | |
377 | * path routing information is updated. | |
378 | */ | |
f698d856 | 379 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
380 | struct ieee80211_mgmt *mgmt, |
381 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 382 | { |
f698d856 | 383 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
384 | struct mesh_path *mpath; |
385 | struct sta_info *sta; | |
386 | bool fresh_info; | |
4a3cb702 | 387 | const u8 *orig_addr, *ta; |
d19b3bf6 | 388 | u32 orig_sn, orig_metric; |
050ac52c LCC |
389 | unsigned long orig_lifetime, exp_time; |
390 | u32 last_hop_metric, new_metric; | |
391 | bool process = true; | |
050ac52c LCC |
392 | |
393 | rcu_read_lock(); | |
abe60632 | 394 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
395 | if (!sta) { |
396 | rcu_read_unlock(); | |
050ac52c | 397 | return 0; |
dc0b0f7d | 398 | } |
050ac52c LCC |
399 | |
400 | last_hop_metric = airtime_link_metric_get(local, sta); | |
401 | /* Update and check originator routing info */ | |
402 | fresh_info = true; | |
403 | ||
404 | switch (action) { | |
405 | case MPATH_PREQ: | |
406 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 407 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
408 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
409 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
410 | break; | |
411 | case MPATH_PREP: | |
3c26f1f6 TP |
412 | /* Originator here refers to the MP that was the target in the |
413 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
414 | * so that we can easily use a single function to gather path |
415 | * information from both PREQ and PREP frames. | |
416 | */ | |
3c26f1f6 TP |
417 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
418 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
419 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
420 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
421 | break; | |
422 | default: | |
dc0b0f7d | 423 | rcu_read_unlock(); |
050ac52c LCC |
424 | return 0; |
425 | } | |
426 | new_metric = orig_metric + last_hop_metric; | |
427 | if (new_metric < orig_metric) | |
428 | new_metric = MAX_METRIC; | |
429 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
430 | ||
b203ca39 | 431 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
432 | /* This MP is the originator, we are not interested in this |
433 | * frame, except for updating transmitter's path info. | |
434 | */ | |
435 | process = false; | |
436 | fresh_info = false; | |
437 | } else { | |
bf7cd94d | 438 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
439 | if (mpath) { |
440 | spin_lock_bh(&mpath->state_lock); | |
441 | if (mpath->flags & MESH_PATH_FIXED) | |
442 | fresh_info = false; | |
443 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
444 | (mpath->flags & MESH_PATH_SN_VALID)) { |
445 | if (SN_GT(mpath->sn, orig_sn) || | |
446 | (mpath->sn == orig_sn && | |
533866b1 | 447 | new_metric >= mpath->metric)) { |
050ac52c LCC |
448 | process = false; |
449 | fresh_info = false; | |
450 | } | |
d8f0300a JJ |
451 | } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
452 | bool have_sn, newer_sn, bounced; | |
453 | ||
454 | have_sn = mpath->flags & MESH_PATH_SN_VALID; | |
455 | newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); | |
456 | bounced = have_sn && | |
457 | (SN_DELTA(orig_sn, mpath->sn) > | |
458 | MAX_SANE_SN_DELTA); | |
459 | ||
460 | if (!have_sn || newer_sn) { | |
461 | /* if SN is newer than what we had | |
462 | * then we can take it */; | |
463 | } else if (bounced) { | |
464 | /* if SN is way different than what | |
465 | * we had then assume the other side | |
466 | * rebooted or restarted */; | |
467 | } else { | |
468 | process = false; | |
469 | fresh_info = false; | |
470 | } | |
050ac52c LCC |
471 | } |
472 | } else { | |
ae76eef0 BC |
473 | mpath = mesh_path_add(sdata, orig_addr); |
474 | if (IS_ERR(mpath)) { | |
050ac52c | 475 | rcu_read_unlock(); |
050ac52c LCC |
476 | return 0; |
477 | } | |
478 | spin_lock_bh(&mpath->state_lock); | |
479 | } | |
480 | ||
481 | if (fresh_info) { | |
482 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 483 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 484 | mpath->metric = new_metric; |
d19b3bf6 | 485 | mpath->sn = orig_sn; |
050ac52c LCC |
486 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
487 | ? mpath->exp_time : exp_time; | |
488 | mesh_path_activate(mpath); | |
489 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
490 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
491 | /* init it at a low value - 0 start is tricky */ | |
492 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
493 | mesh_path_tx_pending(mpath); |
494 | /* draft says preq_id should be saved to, but there does | |
495 | * not seem to be any use for it, skipping by now | |
496 | */ | |
497 | } else | |
498 | spin_unlock_bh(&mpath->state_lock); | |
499 | } | |
500 | ||
501 | /* Update and check transmitter routing info */ | |
502 | ta = mgmt->sa; | |
b203ca39 | 503 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
504 | fresh_info = false; |
505 | else { | |
506 | fresh_info = true; | |
507 | ||
bf7cd94d | 508 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
509 | if (mpath) { |
510 | spin_lock_bh(&mpath->state_lock); | |
511 | if ((mpath->flags & MESH_PATH_FIXED) || | |
512 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
513 | (last_hop_metric > mpath->metric))) | |
514 | fresh_info = false; | |
515 | } else { | |
ae76eef0 BC |
516 | mpath = mesh_path_add(sdata, ta); |
517 | if (IS_ERR(mpath)) { | |
050ac52c | 518 | rcu_read_unlock(); |
050ac52c LCC |
519 | return 0; |
520 | } | |
521 | spin_lock_bh(&mpath->state_lock); | |
522 | } | |
523 | ||
524 | if (fresh_info) { | |
525 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
526 | mpath->metric = last_hop_metric; |
527 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
528 | ? mpath->exp_time : exp_time; | |
529 | mesh_path_activate(mpath); | |
530 | spin_unlock_bh(&mpath->state_lock); | |
3eb0928f MR |
531 | ewma_mesh_fail_avg_init(&sta->mesh->fail_avg); |
532 | /* init it at a low value - 0 start is tricky */ | |
533 | ewma_mesh_fail_avg_add(&sta->mesh->fail_avg, 1); | |
050ac52c LCC |
534 | mesh_path_tx_pending(mpath); |
535 | } else | |
536 | spin_unlock_bh(&mpath->state_lock); | |
537 | } | |
538 | ||
050ac52c LCC |
539 | rcu_read_unlock(); |
540 | ||
541 | return process ? new_metric : 0; | |
542 | } | |
543 | ||
f698d856 | 544 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 545 | struct ieee80211_mgmt *mgmt, |
5ec596c4 | 546 | const u8 *preq_elem, u32 orig_metric) |
57ef5ddb | 547 | { |
472dbc45 | 548 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 549 | struct mesh_path *mpath = NULL; |
4a3cb702 | 550 | const u8 *target_addr, *orig_addr; |
3d045a54 | 551 | const u8 *da; |
3fbf4b71 | 552 | u8 target_flags, ttl, flags; |
b4201cc4 | 553 | u32 orig_sn, target_sn, lifetime, target_metric = 0; |
050ac52c LCC |
554 | bool reply = false; |
555 | bool forward = true; | |
3fbf4b71 | 556 | bool root_is_gate; |
050ac52c | 557 | |
d19b3bf6 RP |
558 | /* Update target SN, if present */ |
559 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 560 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
561 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
562 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
563 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
564 | /* Proactive PREQ gate announcements */ |
565 | flags = PREQ_IE_FLAGS(preq_elem); | |
566 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 567 | |
bdcbd8e0 | 568 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 569 | |
b203ca39 | 570 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 571 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
572 | forward = false; |
573 | reply = true; | |
5ec596c4 | 574 | target_metric = 0; |
d19b3bf6 | 575 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 576 | net_traversal_jiffies(sdata)) || |
d19b3bf6 | 577 | time_before(jiffies, ifmsh->last_sn_update)) { |
bc3ce0b0 | 578 | ++ifmsh->sn; |
d19b3bf6 | 579 | ifmsh->last_sn_update = jiffies; |
050ac52c | 580 | } |
bc3ce0b0 | 581 | target_sn = ifmsh->sn; |
3fbf4b71 CYY |
582 | } else if (is_broadcast_ether_addr(target_addr) && |
583 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
584 | rcu_read_lock(); | |
bf7cd94d | 585 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
586 | if (mpath) { |
587 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
588 | reply = true; | |
589 | target_addr = sdata->vif.addr; | |
590 | target_sn = ++ifmsh->sn; | |
5ec596c4 | 591 | target_metric = 0; |
3fbf4b71 CYY |
592 | ifmsh->last_sn_update = jiffies; |
593 | } | |
594 | if (root_is_gate) | |
595 | mesh_path_add_gate(mpath); | |
596 | } | |
597 | rcu_read_unlock(); | |
050ac52c LCC |
598 | } else { |
599 | rcu_read_lock(); | |
bf7cd94d | 600 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 601 | if (mpath) { |
d19b3bf6 RP |
602 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
603 | SN_LT(mpath->sn, target_sn)) { | |
604 | mpath->sn = target_sn; | |
605 | mpath->flags |= MESH_PATH_SN_VALID; | |
932e628d | 606 | } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
050ac52c LCC |
607 | (mpath->flags & MESH_PATH_ACTIVE)) { |
608 | reply = true; | |
5ec596c4 | 609 | target_metric = mpath->metric; |
d19b3bf6 | 610 | target_sn = mpath->sn; |
932e628d CYY |
611 | /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
612 | target_flags |= IEEE80211_PREQ_TO_FLAG; | |
050ac52c LCC |
613 | } |
614 | } | |
615 | rcu_read_unlock(); | |
616 | } | |
617 | ||
618 | if (reply) { | |
619 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 620 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 621 | if (ttl != 0) { |
bdcbd8e0 | 622 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 | 623 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
f63f8421 CYY |
624 | orig_sn, 0, target_addr, |
625 | target_sn, mgmt->sa, 0, ttl, | |
5ec596c4 AG |
626 | lifetime, target_metric, 0, |
627 | sdata); | |
3fbf4b71 | 628 | } else { |
472dbc45 | 629 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 630 | } |
050ac52c LCC |
631 | } |
632 | ||
94f90656 | 633 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 634 | u32 preq_id; |
3fbf4b71 | 635 | u8 hopcount; |
050ac52c LCC |
636 | |
637 | ttl = PREQ_IE_TTL(preq_elem); | |
638 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
639 | if (ttl <= 1) { | |
472dbc45 | 640 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
641 | return; |
642 | } | |
bdcbd8e0 | 643 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 644 | --ttl; |
050ac52c LCC |
645 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
646 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
647 | da = (mpath && mpath->is_root) ? |
648 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
649 | |
650 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
651 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
652 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
3fbf4b71 CYY |
653 | } |
654 | ||
050ac52c | 655 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
f63f8421 CYY |
656 | orig_sn, target_flags, target_addr, |
657 | target_sn, da, hopcount, ttl, lifetime, | |
5ec596c4 | 658 | orig_metric, preq_id, sdata); |
7d4e15b1 CYY |
659 | if (!is_multicast_ether_addr(da)) |
660 | ifmsh->mshstats.fwded_unicast++; | |
661 | else | |
662 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 663 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
664 | } |
665 | } | |
666 | ||
667 | ||
40b275b6 JB |
668 | static inline struct sta_info * |
669 | next_hop_deref_protected(struct mesh_path *mpath) | |
670 | { | |
671 | return rcu_dereference_protected(mpath->next_hop, | |
672 | lockdep_is_held(&mpath->state_lock)); | |
673 | } | |
674 | ||
675 | ||
f698d856 | 676 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 677 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 678 | const u8 *prep_elem, u32 metric) |
050ac52c | 679 | { |
d665508b | 680 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 681 | struct mesh_path *mpath; |
4a3cb702 | 682 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
683 | u8 ttl, hopcount, flags; |
684 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 685 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 686 | |
bdcbd8e0 | 687 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 688 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 689 | |
3c26f1f6 | 690 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 691 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
692 | /* destination, no forwarding required */ |
693 | return; | |
694 | ||
d665508b CYY |
695 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
696 | return; | |
697 | ||
050ac52c LCC |
698 | ttl = PREP_IE_TTL(prep_elem); |
699 | if (ttl <= 1) { | |
472dbc45 | 700 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
701 | return; |
702 | } | |
703 | ||
704 | rcu_read_lock(); | |
bf7cd94d | 705 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
706 | if (mpath) |
707 | spin_lock_bh(&mpath->state_lock); | |
708 | else | |
709 | goto fail; | |
710 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
711 | spin_unlock_bh(&mpath->state_lock); | |
712 | goto fail; | |
713 | } | |
40b275b6 | 714 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
715 | spin_unlock_bh(&mpath->state_lock); |
716 | --ttl; | |
717 | flags = PREP_IE_FLAGS(prep_elem); | |
718 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
719 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 720 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
721 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
722 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c | 723 | |
f63f8421 CYY |
724 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
725 | target_addr, target_sn, next_hop, hopcount, | |
726 | ttl, lifetime, metric, 0, sdata); | |
050ac52c | 727 | rcu_read_unlock(); |
c8a61a7d DW |
728 | |
729 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 730 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
731 | return; |
732 | ||
733 | fail: | |
734 | rcu_read_unlock(); | |
472dbc45 | 735 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
736 | } |
737 | ||
f698d856 | 738 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
739 | struct ieee80211_mgmt *mgmt, |
740 | const u8 *perr_elem) | |
050ac52c | 741 | { |
d611f062 | 742 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 743 | struct mesh_path *mpath; |
d611f062 | 744 | u8 ttl; |
4a3cb702 | 745 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
746 | u32 target_sn; |
747 | u16 target_rcode; | |
050ac52c LCC |
748 | |
749 | ta = mgmt->sa; | |
d611f062 RP |
750 | ttl = PERR_IE_TTL(perr_elem); |
751 | if (ttl <= 1) { | |
752 | ifmsh->mshstats.dropped_frames_ttl++; | |
753 | return; | |
754 | } | |
755 | ttl--; | |
d19b3bf6 RP |
756 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
757 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
758 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 759 | |
050ac52c | 760 | rcu_read_lock(); |
bf7cd94d | 761 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 762 | if (mpath) { |
888d04df FF |
763 | struct sta_info *sta; |
764 | ||
050ac52c | 765 | spin_lock_bh(&mpath->state_lock); |
888d04df | 766 | sta = next_hop_deref_protected(mpath); |
050ac52c | 767 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 768 | ether_addr_equal(ta, sta->sta.addr) && |
5df20f21 | 769 | !(mpath->flags & MESH_PATH_FIXED) && |
d19b3bf6 | 770 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
703ee73a | 771 | SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
050ac52c | 772 | mpath->flags &= ~MESH_PATH_ACTIVE; |
703ee73a AG |
773 | if (target_sn != 0) |
774 | mpath->sn = target_sn; | |
775 | else | |
776 | mpath->sn += 1; | |
050ac52c | 777 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
778 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
779 | goto endperr; | |
bf7cd94d | 780 | mesh_path_error_tx(sdata, ttl, target_addr, |
f63f8421 | 781 | target_sn, target_rcode, |
bf7cd94d | 782 | broadcast_addr); |
050ac52c LCC |
783 | } else |
784 | spin_unlock_bh(&mpath->state_lock); | |
785 | } | |
d665508b | 786 | endperr: |
050ac52c LCC |
787 | rcu_read_unlock(); |
788 | } | |
789 | ||
90a5e169 | 790 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
791 | struct ieee80211_mgmt *mgmt, |
792 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
793 | { |
794 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
795 | struct ieee80211_local *local = sdata->local; |
796 | struct sta_info *sta; | |
90a5e169 | 797 | struct mesh_path *mpath; |
90a5e169 | 798 | u8 ttl, flags, hopcount; |
4a3cb702 | 799 | const u8 *orig_addr; |
fbbdad5e | 800 | u32 orig_sn, new_metric, orig_metric, last_hop_metric, interval; |
5ee68e5b | 801 | bool root_is_gate; |
90a5e169 | 802 | |
90a5e169 | 803 | ttl = rann->rann_ttl; |
90a5e169 | 804 | flags = rann->rann_flags; |
5ee68e5b | 805 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 806 | orig_addr = rann->rann_addr; |
292c41ac | 807 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 808 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 809 | hopcount = rann->rann_hopcount; |
a6a58b4f | 810 | hopcount++; |
fbbdad5e | 811 | orig_metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
812 | |
813 | /* Ignore our own RANNs */ | |
b203ca39 | 814 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
815 | return; |
816 | ||
bdcbd8e0 JB |
817 | mhwmp_dbg(sdata, |
818 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
819 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
820 | |
821 | rcu_read_lock(); | |
d2a079fd CYY |
822 | sta = sta_info_get(sdata, mgmt->sa); |
823 | if (!sta) { | |
824 | rcu_read_unlock(); | |
825 | return; | |
826 | } | |
827 | ||
fbbdad5e CYY |
828 | last_hop_metric = airtime_link_metric_get(local, sta); |
829 | new_metric = orig_metric + last_hop_metric; | |
830 | if (new_metric < orig_metric) | |
831 | new_metric = MAX_METRIC; | |
d2a079fd | 832 | |
bf7cd94d | 833 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 834 | if (!mpath) { |
ae76eef0 BC |
835 | mpath = mesh_path_add(sdata, orig_addr); |
836 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
837 | rcu_read_unlock(); |
838 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
839 | return; | |
840 | } | |
90a5e169 | 841 | } |
5ee68e5b | 842 | |
7ebfa469 | 843 | if (!(SN_LT(mpath->sn, orig_sn)) && |
fbbdad5e | 844 | !(mpath->sn == orig_sn && new_metric < mpath->rann_metric)) { |
7ebfa469 CYY |
845 | rcu_read_unlock(); |
846 | return; | |
847 | } | |
848 | ||
5ee68e5b | 849 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
850 | (time_after(jiffies, mpath->last_preq_to_root + |
851 | root_path_confirmation_jiffies(sdata)) || | |
852 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 853 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
854 | mhwmp_dbg(sdata, |
855 | "time to refresh root mpath %pM\n", | |
856 | orig_addr); | |
5ee68e5b | 857 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 858 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
859 | } |
860 | ||
7ebfa469 | 861 | mpath->sn = orig_sn; |
fbbdad5e | 862 | mpath->rann_metric = new_metric; |
7ebfa469 CYY |
863 | mpath->is_root = true; |
864 | /* Recording RANNs sender address to send individually | |
865 | * addressed PREQs destined for root mesh STA */ | |
866 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
867 | ||
868 | if (root_is_gate) | |
869 | mesh_path_add_gate(mpath); | |
870 | ||
871 | if (ttl <= 1) { | |
872 | ifmsh->mshstats.dropped_frames_ttl++; | |
873 | rcu_read_unlock(); | |
874 | return; | |
875 | } | |
876 | ttl--; | |
877 | ||
878 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 879 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
f63f8421 CYY |
880 | orig_sn, 0, NULL, 0, broadcast_addr, |
881 | hopcount, ttl, interval, | |
fbbdad5e | 882 | new_metric, 0, sdata); |
90a5e169 | 883 | } |
3d045a54 | 884 | |
90a5e169 RP |
885 | rcu_read_unlock(); |
886 | } | |
050ac52c LCC |
887 | |
888 | ||
f698d856 | 889 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 890 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c LCC |
891 | { |
892 | struct ieee802_11_elems elems; | |
893 | size_t baselen; | |
afd2efb9 | 894 | u32 path_metric; |
97091317 | 895 | struct sta_info *sta; |
050ac52c | 896 | |
9c80d3dc JB |
897 | /* need action_code */ |
898 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
899 | return; | |
900 | ||
97091317 JC |
901 | rcu_read_lock(); |
902 | sta = sta_info_get(sdata, mgmt->sa); | |
433f5bc1 | 903 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
97091317 JC |
904 | rcu_read_unlock(); |
905 | return; | |
906 | } | |
907 | rcu_read_unlock(); | |
908 | ||
050ac52c LCC |
909 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
910 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
b2e506bf | 911 | len - baselen, false, &elems); |
050ac52c | 912 | |
dbb81c42 RP |
913 | if (elems.preq) { |
914 | if (elems.preq_len != 37) | |
050ac52c LCC |
915 | /* Right now we support just 1 destination and no AE */ |
916 | return; | |
afd2efb9 AG |
917 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
918 | MPATH_PREQ); | |
919 | if (path_metric) | |
dbb81c42 | 920 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, |
afd2efb9 | 921 | path_metric); |
dbb81c42 RP |
922 | } |
923 | if (elems.prep) { | |
924 | if (elems.prep_len != 31) | |
050ac52c LCC |
925 | /* Right now we support no AE */ |
926 | return; | |
afd2efb9 AG |
927 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
928 | MPATH_PREP); | |
929 | if (path_metric) | |
dbb81c42 | 930 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, |
afd2efb9 | 931 | path_metric); |
dbb81c42 RP |
932 | } |
933 | if (elems.perr) { | |
d611f062 | 934 | if (elems.perr_len != 15) |
050ac52c LCC |
935 | /* Right now we support only one destination per PERR */ |
936 | return; | |
f698d856 | 937 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 938 | } |
90a5e169 RP |
939 | if (elems.rann) |
940 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
941 | } |
942 | ||
943 | /** | |
944 | * mesh_queue_preq - queue a PREQ to a given destination | |
945 | * | |
946 | * @mpath: mesh path to discover | |
947 | * @flags: special attributes of the PREQ to be sent | |
948 | * | |
949 | * Locking: the function must be called from within a rcu read lock block. | |
950 | * | |
951 | */ | |
952 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
953 | { | |
f698d856 | 954 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 955 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
956 | struct mesh_preq_queue *preq_node; |
957 | ||
59615b5f | 958 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 959 | if (!preq_node) { |
bdcbd8e0 | 960 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
961 | return; |
962 | } | |
963 | ||
987dafad | 964 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 965 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 966 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
967 | kfree(preq_node); |
968 | if (printk_ratelimit()) | |
bdcbd8e0 | 969 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
970 | return; |
971 | } | |
972 | ||
f2dc7989 | 973 | spin_lock(&mpath->state_lock); |
f3011cf9 | 974 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 975 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 976 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 977 | kfree(preq_node); |
f3011cf9 JC |
978 | return; |
979 | } | |
980 | ||
050ac52c LCC |
981 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
982 | preq_node->flags = flags; | |
983 | ||
f3011cf9 | 984 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 985 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 986 | |
472dbc45 JB |
987 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
988 | ++ifmsh->preq_queue_len; | |
987dafad | 989 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 990 | |
472dbc45 | 991 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 992 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 993 | |
472dbc45 | 994 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
995 | /* avoid long wait if did not send preqs for a long time |
996 | * and jiffies wrapped around | |
997 | */ | |
472dbc45 | 998 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 999 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 1000 | } else |
472dbc45 | 1001 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
1002 | min_preq_int_jiff(sdata)); |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
1007 | * | |
f698d856 | 1008 | * @sdata: local mesh subif |
050ac52c | 1009 | */ |
f698d856 | 1010 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 1011 | { |
472dbc45 | 1012 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
1013 | struct mesh_preq_queue *preq_node; |
1014 | struct mesh_path *mpath; | |
932e628d | 1015 | u8 ttl, target_flags = 0; |
3d045a54 | 1016 | const u8 *da; |
050ac52c LCC |
1017 | u32 lifetime; |
1018 | ||
a43816df | 1019 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
1020 | if (!ifmsh->preq_queue_len || |
1021 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 1022 | min_preq_int_jiff(sdata))) { |
a43816df | 1023 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1024 | return; |
1025 | } | |
1026 | ||
472dbc45 | 1027 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
1028 | struct mesh_preq_queue, list); |
1029 | list_del(&preq_node->list); | |
472dbc45 | 1030 | --ifmsh->preq_queue_len; |
a43816df | 1031 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1032 | |
1033 | rcu_read_lock(); | |
bf7cd94d | 1034 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
1035 | if (!mpath) |
1036 | goto enddiscovery; | |
1037 | ||
1038 | spin_lock_bh(&mpath->state_lock); | |
5df20f21 | 1039 | if (mpath->flags & (MESH_PATH_DELETED | MESH_PATH_FIXED)) { |
74932959 BC |
1040 | spin_unlock_bh(&mpath->state_lock); |
1041 | goto enddiscovery; | |
1042 | } | |
f3011cf9 | 1043 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1044 | if (preq_node->flags & PREQ_Q_F_START) { |
1045 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1046 | spin_unlock_bh(&mpath->state_lock); | |
1047 | goto enddiscovery; | |
1048 | } else { | |
1049 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1050 | mpath->flags |= MESH_PATH_RESOLVING; | |
1051 | mpath->discovery_retries = 0; | |
1052 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1053 | } | |
1054 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1055 | mpath->flags & MESH_PATH_RESOLVED) { | |
1056 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1057 | spin_unlock_bh(&mpath->state_lock); | |
1058 | goto enddiscovery; | |
1059 | } | |
1060 | ||
472dbc45 | 1061 | ifmsh->last_preq = jiffies; |
050ac52c | 1062 | |
d19b3bf6 | 1063 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1064 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1065 | time_before(jiffies, ifmsh->last_sn_update)) { |
1066 | ++ifmsh->sn; | |
1067 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1068 | } |
1069 | lifetime = default_lifetime(sdata); | |
45904f21 | 1070 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1071 | if (ttl == 0) { |
472dbc45 | 1072 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1073 | spin_unlock_bh(&mpath->state_lock); |
1074 | goto enddiscovery; | |
1075 | } | |
1076 | ||
1077 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
932e628d | 1078 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
050ac52c | 1079 | else |
932e628d | 1080 | target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
050ac52c LCC |
1081 | |
1082 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1083 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
f63f8421 CYY |
1084 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
1085 | target_flags, mpath->dst, mpath->sn, da, 0, | |
1086 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); | |
050ac52c LCC |
1087 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1088 | ||
1089 | enddiscovery: | |
1090 | rcu_read_unlock(); | |
1091 | kfree(preq_node); | |
1092 | } | |
1093 | ||
2c53040f BH |
1094 | /** |
1095 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1096 | * |
e32f85f7 | 1097 | * @skb: 802.11 frame to be sent |
f698d856 | 1098 | * @sdata: network subif the frame will be sent through |
050ac52c | 1099 | * |
2c53040f BH |
1100 | * Lookup next hop for given skb and start path discovery if no |
1101 | * forwarding information is found. | |
1102 | * | |
0cfda851 TP |
1103 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1104 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1105 | */ |
bf7cd94d JB |
1106 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1107 | struct sk_buff *skb) | |
050ac52c | 1108 | { |
e32f85f7 | 1109 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1110 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1111 | struct mesh_path *mpath; | |
1112 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1113 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1114 | int err = 0; |
1115 | ||
3f52b7e3 MP |
1116 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1117 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1118 | return 0; | |
1119 | ||
050ac52c | 1120 | rcu_read_lock(); |
bf7cd94d | 1121 | err = mesh_nexthop_lookup(sdata, skb); |
0cfda851 TP |
1122 | if (!err) |
1123 | goto endlookup; | |
050ac52c | 1124 | |
0cfda851 | 1125 | /* no nexthop found, start resolving */ |
bf7cd94d | 1126 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1127 | if (!mpath) { |
ae76eef0 BC |
1128 | mpath = mesh_path_add(sdata, target_addr); |
1129 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1130 | mesh_path_discard_frame(sdata, skb); |
ae76eef0 | 1131 | err = PTR_ERR(mpath); |
050ac52c LCC |
1132 | goto endlookup; |
1133 | } | |
1134 | } | |
1135 | ||
0cfda851 TP |
1136 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1137 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1138 | ||
1139 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1140 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1141 | ||
1142 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1143 | ieee80211_set_qos_hdr(sdata, skb); | |
1144 | skb_queue_tail(&mpath->frame_queue, skb); | |
1145 | err = -ENOENT; | |
1146 | if (skb_to_free) | |
bf7cd94d | 1147 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 TP |
1148 | |
1149 | endlookup: | |
1150 | rcu_read_unlock(); | |
1151 | return err; | |
1152 | } | |
bf7cd94d | 1153 | |
0cfda851 TP |
1154 | /** |
1155 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1156 | * this function is considered "using" the associated mpath, so preempt a path | |
1157 | * refresh if this mpath expires soon. | |
1158 | * | |
1159 | * @skb: 802.11 frame to be sent | |
1160 | * @sdata: network subif the frame will be sent through | |
1161 | * | |
1162 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1163 | */ | |
bf7cd94d JB |
1164 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1165 | struct sk_buff *skb) | |
0cfda851 TP |
1166 | { |
1167 | struct mesh_path *mpath; | |
1168 | struct sta_info *next_hop; | |
1169 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1170 | u8 *target_addr = hdr->addr3; | |
1171 | int err = -ENOENT; | |
050ac52c | 1172 | |
0cfda851 | 1173 | rcu_read_lock(); |
bf7cd94d | 1174 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 TP |
1175 | |
1176 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1177 | goto endlookup; | |
1178 | ||
1179 | if (time_after(jiffies, | |
1180 | mpath->exp_time - | |
1181 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1182 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1183 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1184 | !(mpath->flags & MESH_PATH_FIXED)) | |
1185 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1186 | |
0cfda851 TP |
1187 | next_hop = rcu_dereference(mpath->next_hop); |
1188 | if (next_hop) { | |
1189 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1190 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
3f52b7e3 | 1191 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
0cfda851 | 1192 | err = 0; |
050ac52c LCC |
1193 | } |
1194 | ||
1195 | endlookup: | |
1196 | rcu_read_unlock(); | |
1197 | return err; | |
1198 | } | |
1199 | ||
34f11cd3 | 1200 | void mesh_path_timer(struct timer_list *t) |
050ac52c | 1201 | { |
34f11cd3 | 1202 | struct mesh_path *mpath = from_timer(mpath, t, timer); |
dea4096b | 1203 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
5ee68e5b | 1204 | int ret; |
5bb644a0 | 1205 | |
dea4096b | 1206 | if (sdata->local->quiescing) |
5bb644a0 | 1207 | return; |
5bb644a0 JB |
1208 | |
1209 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1210 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1211 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1212 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1213 | spin_unlock_bh(&mpath->state_lock); |
1214 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1215 | ++mpath->discovery_retries; |
1216 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1217 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1218 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1219 | mesh_queue_preq(mpath, 0); |
1220 | } else { | |
d8254710 JJ |
1221 | mpath->flags &= ~(MESH_PATH_RESOLVING | |
1222 | MESH_PATH_RESOLVED | | |
1223 | MESH_PATH_REQ_QUEUED); | |
050ac52c | 1224 | mpath->exp_time = jiffies; |
5ee68e5b JC |
1225 | spin_unlock_bh(&mpath->state_lock); |
1226 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1227 | ret = mesh_path_send_to_gates(mpath); | |
1228 | if (ret) | |
bdcbd8e0 | 1229 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1230 | } else |
1231 | mesh_path_flush_pending(mpath); | |
050ac52c | 1232 | } |
050ac52c | 1233 | } |
e304bfd3 | 1234 | |
bf7cd94d | 1235 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
1236 | { |
1237 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1238 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1239 | u8 flags, target_flags = 0; |
e304bfd3 | 1240 | |
16dd7267 JC |
1241 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1242 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1243 | |
1244 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1245 | case IEEE80211_PROACTIVE_RANN: | |
1246 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
f63f8421 CYY |
1247 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
1248 | 0, ifmsh->mshcfg.element_ttl, | |
1249 | interval, 0, 0, sdata); | |
a69cc44f CYY |
1250 | break; |
1251 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1252 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1253 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1254 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1255 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1256 | IEEE80211_PREQ_USN_FLAG; | |
1257 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
f63f8421 CYY |
1258 | ++ifmsh->sn, target_flags, |
1259 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1260 | 0, ifmsh->mshcfg.element_ttl, interval, | |
1261 | 0, ifmsh->preq_id++, sdata); | |
a69cc44f CYY |
1262 | break; |
1263 | default: | |
bdcbd8e0 | 1264 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1265 | return; |
1266 | } | |
e304bfd3 | 1267 | } |