Commit | Line | Data |
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050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
888d04df | 11 | #include <linux/etherdevice.h> |
d26ad377 | 12 | #include <asm/unaligned.h> |
2cca397f | 13 | #include "wme.h" |
050ac52c LCC |
14 | #include "mesh.h" |
15 | ||
050ac52c LCC |
16 | #define TEST_FRAME_LEN 8192 |
17 | #define MAX_METRIC 0xffffffff | |
18 | #define ARITH_SHIFT 8 | |
19 | ||
050ac52c LCC |
20 | #define MAX_PREQ_QUEUE_LEN 64 |
21 | ||
90a5e169 RP |
22 | static void mesh_queue_preq(struct mesh_path *, u8); |
23 | ||
4a3cb702 | 24 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
a00de5d0 LCC |
25 | { |
26 | if (ae) | |
27 | offset += 6; | |
ae7245cb | 28 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
29 | } |
30 | ||
aee6499c | 31 | static inline u16 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
d611f062 RP |
32 | { |
33 | if (ae) | |
34 | offset += 6; | |
35 | return get_unaligned_le16(preq_elem + offset); | |
36 | } | |
37 | ||
050ac52c | 38 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
39 | #define AE_F (1<<6) |
40 | #define AE_F_SET(x) (*x & AE_F) | |
41 | #define PREQ_IE_FLAGS(x) (*(x)) | |
42 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
43 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
44 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
45 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
46 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
47 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
48 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
49 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
50 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 51 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
52 | |
53 | ||
54 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
55 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
56 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
57 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
58 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
59 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
60 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
61 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
62 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 63 | |
d611f062 | 64 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
65 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
66 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
67 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
68 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 69 | |
050ac52c | 70 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
71 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
72 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
d8f0300a JJ |
73 | #define MAX_SANE_SN_DELTA 32 |
74 | ||
75 | static inline u32 SN_DELTA(u32 x, u32 y) | |
76 | { | |
77 | return x >= y ? x - y : y - x; | |
78 | } | |
050ac52c LCC |
79 | |
80 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 81 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 82 | #define default_lifetime(s) \ |
472dbc45 | 83 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 84 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
85 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
86 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 87 | #define disc_timeout_jiff(s) \ |
472dbc45 | 88 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
89 | #define root_path_confirmation_jiffies(s) \ |
90 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
91 | |
92 | enum mpath_frame_type { | |
93 | MPATH_PREQ = 0, | |
94 | MPATH_PREP, | |
90a5e169 RP |
95 | MPATH_PERR, |
96 | MPATH_RANN | |
050ac52c LCC |
97 | }; |
98 | ||
15ff6365 JB |
99 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
100 | ||
050ac52c | 101 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
f63f8421 | 102 | const u8 *orig_addr, u32 orig_sn, |
4a3cb702 | 103 | u8 target_flags, const u8 *target, |
f63f8421 | 104 | u32 target_sn, const u8 *da, |
4a3cb702 | 105 | u8 hop_count, u8 ttl, |
f63f8421 | 106 | u32 lifetime, u32 metric, u32 preq_id, |
4a3cb702 | 107 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 108 | { |
f698d856 | 109 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 110 | struct sk_buff *skb; |
050ac52c | 111 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
112 | u8 *pos, ie_len; |
113 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
114 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 115 | |
65e8b0cc | 116 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
117 | hdr_len + |
118 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
119 | if (!skb) |
120 | return -1; | |
65e8b0cc | 121 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
122 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
123 | memset(mgmt, 0, 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 TP |
244 | u8 *pos, ie_len; |
245 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
246 | sizeof(mgmt->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); |
3b69a9c5 TP |
259 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
260 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
261 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
262 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
263 | |
264 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 265 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
266 | /* BSSID == SA */ |
267 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
268 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
269 | mgmt->u.action.u.mesh_action.action_code = | |
270 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 271 | ie_len = 15; |
050ac52c LCC |
272 | pos = skb_put(skb, 2 + ie_len); |
273 | *pos++ = WLAN_EID_PERR; | |
274 | *pos++ = ie_len; | |
d611f062 | 275 | /* ttl */ |
45904f21 | 276 | *pos++ = ttl; |
050ac52c LCC |
277 | /* number of destinations */ |
278 | *pos++ = 1; | |
932e628d CYY |
279 | /* Flags field has AE bit only as defined in |
280 | * sec 8.4.2.117 IEEE802.11-2012 | |
d611f062 RP |
281 | */ |
282 | *pos = 0; | |
d611f062 | 283 | pos++; |
d19b3bf6 | 284 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 285 | pos += ETH_ALEN; |
f63f8421 | 286 | put_unaligned_le32(target_sn, pos); |
d611f062 | 287 | pos += 4; |
f63f8421 | 288 | put_unaligned_le16(target_rcode, pos); |
050ac52c | 289 | |
2cca397f JC |
290 | /* see note in function header */ |
291 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
292 | ifmsh->next_perr = TU_TO_EXP_TIME( |
293 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 294 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
295 | return 0; |
296 | } | |
297 | ||
bfc32e6a | 298 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 299 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
300 | { |
301 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
302 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
303 | int failed; | |
304 | ||
305 | if (!ieee80211_is_data(hdr->frame_control)) | |
306 | return; | |
307 | ||
308 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
309 | ||
310 | /* moving average, scaled to 100 */ | |
a76d5e0a JB |
311 | sta->mesh->fail_avg = |
312 | ((80 * sta->mesh->fail_avg + 5) / 100 + 20 * failed); | |
313 | if (sta->mesh->fail_avg > 95) | |
35b3fe1c | 314 | mesh_plink_broken(sta); |
bfc32e6a JC |
315 | } |
316 | ||
050ac52c LCC |
317 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
318 | struct sta_info *sta) | |
319 | { | |
6b62bf32 | 320 | struct rate_info rinfo; |
050ac52c LCC |
321 | /* This should be adjusted for each device */ |
322 | int device_constant = 1 << ARITH_SHIFT; | |
323 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
324 | int s_unit = 1 << ARITH_SHIFT; | |
325 | int rate, err; | |
326 | u32 tx_time, estimated_retx; | |
327 | u64 result; | |
328 | ||
a76d5e0a | 329 | if (sta->mesh->fail_avg >= 100) |
050ac52c | 330 | return MAX_METRIC; |
e6a9854b | 331 | |
e5a9f8d0 | 332 | sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo); |
6b62bf32 TP |
333 | rate = cfg80211_calculate_bitrate(&rinfo); |
334 | if (WARN_ON(!rate)) | |
e6a9854b JB |
335 | return MAX_METRIC; |
336 | ||
a76d5e0a | 337 | err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100; |
050ac52c LCC |
338 | |
339 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
340 | * 1Mbps. This will be corrected on tx_time computation. | |
341 | */ | |
050ac52c LCC |
342 | tx_time = (device_constant + 10 * test_frame_len / rate); |
343 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
344 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
345 | return (u32)result; | |
346 | } | |
347 | ||
348 | /** | |
349 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
350 | * | |
f698d856 | 351 | * @sdata: local mesh subif |
050ac52c LCC |
352 | * @mgmt: mesh management frame |
353 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 354 | * @action: type of hwmp ie |
050ac52c LCC |
355 | * |
356 | * This function updates the path routing information to the originator and the | |
f99288d1 | 357 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
358 | * |
359 | * Returns: metric to frame originator or 0 if the frame should not be further | |
360 | * processed | |
361 | * | |
362 | * Notes: this function is the only place (besides user-provided info) where | |
363 | * path routing information is updated. | |
364 | */ | |
f698d856 | 365 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
366 | struct ieee80211_mgmt *mgmt, |
367 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 368 | { |
f698d856 | 369 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
370 | struct mesh_path *mpath; |
371 | struct sta_info *sta; | |
372 | bool fresh_info; | |
4a3cb702 | 373 | const u8 *orig_addr, *ta; |
d19b3bf6 | 374 | u32 orig_sn, orig_metric; |
050ac52c LCC |
375 | unsigned long orig_lifetime, exp_time; |
376 | u32 last_hop_metric, new_metric; | |
377 | bool process = true; | |
050ac52c LCC |
378 | |
379 | rcu_read_lock(); | |
abe60632 | 380 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
381 | if (!sta) { |
382 | rcu_read_unlock(); | |
050ac52c | 383 | return 0; |
dc0b0f7d | 384 | } |
050ac52c LCC |
385 | |
386 | last_hop_metric = airtime_link_metric_get(local, sta); | |
387 | /* Update and check originator routing info */ | |
388 | fresh_info = true; | |
389 | ||
390 | switch (action) { | |
391 | case MPATH_PREQ: | |
392 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 393 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
394 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
395 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
396 | break; | |
397 | case MPATH_PREP: | |
3c26f1f6 TP |
398 | /* Originator here refers to the MP that was the target in the |
399 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
400 | * so that we can easily use a single function to gather path |
401 | * information from both PREQ and PREP frames. | |
402 | */ | |
3c26f1f6 TP |
403 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
404 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
405 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
406 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
407 | break; | |
408 | default: | |
dc0b0f7d | 409 | rcu_read_unlock(); |
050ac52c LCC |
410 | return 0; |
411 | } | |
412 | new_metric = orig_metric + last_hop_metric; | |
413 | if (new_metric < orig_metric) | |
414 | new_metric = MAX_METRIC; | |
415 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
416 | ||
b203ca39 | 417 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
418 | /* This MP is the originator, we are not interested in this |
419 | * frame, except for updating transmitter's path info. | |
420 | */ | |
421 | process = false; | |
422 | fresh_info = false; | |
423 | } else { | |
bf7cd94d | 424 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
425 | if (mpath) { |
426 | spin_lock_bh(&mpath->state_lock); | |
427 | if (mpath->flags & MESH_PATH_FIXED) | |
428 | fresh_info = false; | |
429 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
430 | (mpath->flags & MESH_PATH_SN_VALID)) { |
431 | if (SN_GT(mpath->sn, orig_sn) || | |
432 | (mpath->sn == orig_sn && | |
533866b1 | 433 | new_metric >= mpath->metric)) { |
050ac52c LCC |
434 | process = false; |
435 | fresh_info = false; | |
436 | } | |
d8f0300a JJ |
437 | } else if (!(mpath->flags & MESH_PATH_ACTIVE)) { |
438 | bool have_sn, newer_sn, bounced; | |
439 | ||
440 | have_sn = mpath->flags & MESH_PATH_SN_VALID; | |
441 | newer_sn = have_sn && SN_GT(orig_sn, mpath->sn); | |
442 | bounced = have_sn && | |
443 | (SN_DELTA(orig_sn, mpath->sn) > | |
444 | MAX_SANE_SN_DELTA); | |
445 | ||
446 | if (!have_sn || newer_sn) { | |
447 | /* if SN is newer than what we had | |
448 | * then we can take it */; | |
449 | } else if (bounced) { | |
450 | /* if SN is way different than what | |
451 | * we had then assume the other side | |
452 | * rebooted or restarted */; | |
453 | } else { | |
454 | process = false; | |
455 | fresh_info = false; | |
456 | } | |
050ac52c LCC |
457 | } |
458 | } else { | |
ae76eef0 BC |
459 | mpath = mesh_path_add(sdata, orig_addr); |
460 | if (IS_ERR(mpath)) { | |
050ac52c | 461 | rcu_read_unlock(); |
050ac52c LCC |
462 | return 0; |
463 | } | |
464 | spin_lock_bh(&mpath->state_lock); | |
465 | } | |
466 | ||
467 | if (fresh_info) { | |
468 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 469 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 470 | mpath->metric = new_metric; |
d19b3bf6 | 471 | mpath->sn = orig_sn; |
050ac52c LCC |
472 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
473 | ? mpath->exp_time : exp_time; | |
474 | mesh_path_activate(mpath); | |
475 | spin_unlock_bh(&mpath->state_lock); | |
476 | mesh_path_tx_pending(mpath); | |
477 | /* draft says preq_id should be saved to, but there does | |
478 | * not seem to be any use for it, skipping by now | |
479 | */ | |
480 | } else | |
481 | spin_unlock_bh(&mpath->state_lock); | |
482 | } | |
483 | ||
484 | /* Update and check transmitter routing info */ | |
485 | ta = mgmt->sa; | |
b203ca39 | 486 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
487 | fresh_info = false; |
488 | else { | |
489 | fresh_info = true; | |
490 | ||
bf7cd94d | 491 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
492 | if (mpath) { |
493 | spin_lock_bh(&mpath->state_lock); | |
494 | if ((mpath->flags & MESH_PATH_FIXED) || | |
495 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
496 | (last_hop_metric > mpath->metric))) | |
497 | fresh_info = false; | |
498 | } else { | |
ae76eef0 BC |
499 | mpath = mesh_path_add(sdata, ta); |
500 | if (IS_ERR(mpath)) { | |
050ac52c | 501 | rcu_read_unlock(); |
050ac52c LCC |
502 | return 0; |
503 | } | |
504 | spin_lock_bh(&mpath->state_lock); | |
505 | } | |
506 | ||
507 | if (fresh_info) { | |
508 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
509 | mpath->metric = last_hop_metric; |
510 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
511 | ? mpath->exp_time : exp_time; | |
512 | mesh_path_activate(mpath); | |
513 | spin_unlock_bh(&mpath->state_lock); | |
514 | mesh_path_tx_pending(mpath); | |
515 | } else | |
516 | spin_unlock_bh(&mpath->state_lock); | |
517 | } | |
518 | ||
050ac52c LCC |
519 | rcu_read_unlock(); |
520 | ||
521 | return process ? new_metric : 0; | |
522 | } | |
523 | ||
f698d856 | 524 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 525 | struct ieee80211_mgmt *mgmt, |
5ec596c4 | 526 | const u8 *preq_elem, u32 orig_metric) |
57ef5ddb | 527 | { |
472dbc45 | 528 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 529 | struct mesh_path *mpath = NULL; |
4a3cb702 | 530 | const u8 *target_addr, *orig_addr; |
3d045a54 | 531 | const u8 *da; |
3fbf4b71 | 532 | u8 target_flags, ttl, flags; |
5ec596c4 | 533 | u32 orig_sn, target_sn, lifetime, target_metric; |
050ac52c LCC |
534 | bool reply = false; |
535 | bool forward = true; | |
3fbf4b71 | 536 | bool root_is_gate; |
050ac52c | 537 | |
d19b3bf6 RP |
538 | /* Update target SN, if present */ |
539 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 540 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
541 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
542 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
543 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
544 | /* Proactive PREQ gate announcements */ |
545 | flags = PREQ_IE_FLAGS(preq_elem); | |
546 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 547 | |
bdcbd8e0 | 548 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 549 | |
b203ca39 | 550 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 551 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
552 | forward = false; |
553 | reply = true; | |
5ec596c4 | 554 | target_metric = 0; |
d19b3bf6 | 555 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 556 | net_traversal_jiffies(sdata)) || |
d19b3bf6 | 557 | time_before(jiffies, ifmsh->last_sn_update)) { |
bc3ce0b0 | 558 | ++ifmsh->sn; |
d19b3bf6 | 559 | ifmsh->last_sn_update = jiffies; |
050ac52c | 560 | } |
bc3ce0b0 | 561 | target_sn = ifmsh->sn; |
3fbf4b71 CYY |
562 | } else if (is_broadcast_ether_addr(target_addr) && |
563 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
564 | rcu_read_lock(); | |
bf7cd94d | 565 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
566 | if (mpath) { |
567 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
568 | reply = true; | |
569 | target_addr = sdata->vif.addr; | |
570 | target_sn = ++ifmsh->sn; | |
5ec596c4 | 571 | target_metric = 0; |
3fbf4b71 CYY |
572 | ifmsh->last_sn_update = jiffies; |
573 | } | |
574 | if (root_is_gate) | |
575 | mesh_path_add_gate(mpath); | |
576 | } | |
577 | rcu_read_unlock(); | |
050ac52c LCC |
578 | } else { |
579 | rcu_read_lock(); | |
bf7cd94d | 580 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 581 | if (mpath) { |
d19b3bf6 RP |
582 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
583 | SN_LT(mpath->sn, target_sn)) { | |
584 | mpath->sn = target_sn; | |
585 | mpath->flags |= MESH_PATH_SN_VALID; | |
932e628d | 586 | } else if ((!(target_flags & IEEE80211_PREQ_TO_FLAG)) && |
050ac52c LCC |
587 | (mpath->flags & MESH_PATH_ACTIVE)) { |
588 | reply = true; | |
5ec596c4 | 589 | target_metric = mpath->metric; |
d19b3bf6 | 590 | target_sn = mpath->sn; |
932e628d CYY |
591 | /* Case E2 of sec 13.10.9.3 IEEE 802.11-2012*/ |
592 | target_flags |= IEEE80211_PREQ_TO_FLAG; | |
050ac52c LCC |
593 | } |
594 | } | |
595 | rcu_read_unlock(); | |
596 | } | |
597 | ||
598 | if (reply) { | |
599 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 600 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 601 | if (ttl != 0) { |
bdcbd8e0 | 602 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 | 603 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
f63f8421 CYY |
604 | orig_sn, 0, target_addr, |
605 | target_sn, mgmt->sa, 0, ttl, | |
5ec596c4 AG |
606 | lifetime, target_metric, 0, |
607 | sdata); | |
3fbf4b71 | 608 | } else { |
472dbc45 | 609 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 610 | } |
050ac52c LCC |
611 | } |
612 | ||
94f90656 | 613 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 614 | u32 preq_id; |
3fbf4b71 | 615 | u8 hopcount; |
050ac52c LCC |
616 | |
617 | ttl = PREQ_IE_TTL(preq_elem); | |
618 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
619 | if (ttl <= 1) { | |
472dbc45 | 620 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
621 | return; |
622 | } | |
bdcbd8e0 | 623 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 624 | --ttl; |
050ac52c LCC |
625 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
626 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
627 | da = (mpath && mpath->is_root) ? |
628 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
629 | |
630 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
631 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
632 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
3fbf4b71 CYY |
633 | } |
634 | ||
050ac52c | 635 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
f63f8421 CYY |
636 | orig_sn, target_flags, target_addr, |
637 | target_sn, da, hopcount, ttl, lifetime, | |
5ec596c4 | 638 | orig_metric, preq_id, sdata); |
7d4e15b1 CYY |
639 | if (!is_multicast_ether_addr(da)) |
640 | ifmsh->mshstats.fwded_unicast++; | |
641 | else | |
642 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 643 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
644 | } |
645 | } | |
646 | ||
647 | ||
40b275b6 JB |
648 | static inline struct sta_info * |
649 | next_hop_deref_protected(struct mesh_path *mpath) | |
650 | { | |
651 | return rcu_dereference_protected(mpath->next_hop, | |
652 | lockdep_is_held(&mpath->state_lock)); | |
653 | } | |
654 | ||
655 | ||
f698d856 | 656 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 657 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 658 | const u8 *prep_elem, u32 metric) |
050ac52c | 659 | { |
d665508b | 660 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 661 | struct mesh_path *mpath; |
4a3cb702 | 662 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
663 | u8 ttl, hopcount, flags; |
664 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 665 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 666 | |
bdcbd8e0 | 667 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 668 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 669 | |
3c26f1f6 | 670 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 671 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
672 | /* destination, no forwarding required */ |
673 | return; | |
674 | ||
d665508b CYY |
675 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
676 | return; | |
677 | ||
050ac52c LCC |
678 | ttl = PREP_IE_TTL(prep_elem); |
679 | if (ttl <= 1) { | |
472dbc45 | 680 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
681 | return; |
682 | } | |
683 | ||
684 | rcu_read_lock(); | |
bf7cd94d | 685 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
686 | if (mpath) |
687 | spin_lock_bh(&mpath->state_lock); | |
688 | else | |
689 | goto fail; | |
690 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
691 | spin_unlock_bh(&mpath->state_lock); | |
692 | goto fail; | |
693 | } | |
40b275b6 | 694 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
695 | spin_unlock_bh(&mpath->state_lock); |
696 | --ttl; | |
697 | flags = PREP_IE_FLAGS(prep_elem); | |
698 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
699 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 700 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
701 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
702 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c | 703 | |
f63f8421 CYY |
704 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, orig_sn, 0, |
705 | target_addr, target_sn, next_hop, hopcount, | |
706 | ttl, lifetime, metric, 0, sdata); | |
050ac52c | 707 | rcu_read_unlock(); |
c8a61a7d DW |
708 | |
709 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 710 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
711 | return; |
712 | ||
713 | fail: | |
714 | rcu_read_unlock(); | |
472dbc45 | 715 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
716 | } |
717 | ||
f698d856 | 718 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
719 | struct ieee80211_mgmt *mgmt, |
720 | const u8 *perr_elem) | |
050ac52c | 721 | { |
d611f062 | 722 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 723 | struct mesh_path *mpath; |
d611f062 | 724 | u8 ttl; |
4a3cb702 | 725 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
726 | u32 target_sn; |
727 | u16 target_rcode; | |
050ac52c LCC |
728 | |
729 | ta = mgmt->sa; | |
d611f062 RP |
730 | ttl = PERR_IE_TTL(perr_elem); |
731 | if (ttl <= 1) { | |
732 | ifmsh->mshstats.dropped_frames_ttl++; | |
733 | return; | |
734 | } | |
735 | ttl--; | |
d19b3bf6 RP |
736 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
737 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
738 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 739 | |
050ac52c | 740 | rcu_read_lock(); |
bf7cd94d | 741 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 742 | if (mpath) { |
888d04df FF |
743 | struct sta_info *sta; |
744 | ||
050ac52c | 745 | spin_lock_bh(&mpath->state_lock); |
888d04df | 746 | sta = next_hop_deref_protected(mpath); |
050ac52c | 747 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 748 | ether_addr_equal(ta, sta->sta.addr) && |
d19b3bf6 | 749 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
703ee73a | 750 | SN_GT(target_sn, mpath->sn) || target_sn == 0)) { |
050ac52c | 751 | mpath->flags &= ~MESH_PATH_ACTIVE; |
703ee73a AG |
752 | if (target_sn != 0) |
753 | mpath->sn = target_sn; | |
754 | else | |
755 | mpath->sn += 1; | |
050ac52c | 756 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
757 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
758 | goto endperr; | |
bf7cd94d | 759 | mesh_path_error_tx(sdata, ttl, target_addr, |
f63f8421 | 760 | target_sn, target_rcode, |
bf7cd94d | 761 | broadcast_addr); |
050ac52c LCC |
762 | } else |
763 | spin_unlock_bh(&mpath->state_lock); | |
764 | } | |
d665508b | 765 | endperr: |
050ac52c LCC |
766 | rcu_read_unlock(); |
767 | } | |
768 | ||
90a5e169 | 769 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
770 | struct ieee80211_mgmt *mgmt, |
771 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
772 | { |
773 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
774 | struct ieee80211_local *local = sdata->local; |
775 | struct sta_info *sta; | |
90a5e169 | 776 | struct mesh_path *mpath; |
90a5e169 | 777 | u8 ttl, flags, hopcount; |
4a3cb702 | 778 | const u8 *orig_addr; |
d2a079fd | 779 | u32 orig_sn, metric, metric_txsta, interval; |
5ee68e5b | 780 | bool root_is_gate; |
90a5e169 | 781 | |
90a5e169 | 782 | ttl = rann->rann_ttl; |
90a5e169 | 783 | flags = rann->rann_flags; |
5ee68e5b | 784 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 785 | orig_addr = rann->rann_addr; |
292c41ac | 786 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 787 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 788 | hopcount = rann->rann_hopcount; |
a6a58b4f | 789 | hopcount++; |
292c41ac | 790 | metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
791 | |
792 | /* Ignore our own RANNs */ | |
b203ca39 | 793 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
794 | return; |
795 | ||
bdcbd8e0 JB |
796 | mhwmp_dbg(sdata, |
797 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
798 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
799 | |
800 | rcu_read_lock(); | |
d2a079fd CYY |
801 | sta = sta_info_get(sdata, mgmt->sa); |
802 | if (!sta) { | |
803 | rcu_read_unlock(); | |
804 | return; | |
805 | } | |
806 | ||
807 | metric_txsta = airtime_link_metric_get(local, sta); | |
808 | ||
bf7cd94d | 809 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 810 | if (!mpath) { |
ae76eef0 BC |
811 | mpath = mesh_path_add(sdata, orig_addr); |
812 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
813 | rcu_read_unlock(); |
814 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
815 | return; | |
816 | } | |
90a5e169 | 817 | } |
5ee68e5b | 818 | |
7ebfa469 CYY |
819 | if (!(SN_LT(mpath->sn, orig_sn)) && |
820 | !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { | |
821 | rcu_read_unlock(); | |
822 | return; | |
823 | } | |
824 | ||
5ee68e5b | 825 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
826 | (time_after(jiffies, mpath->last_preq_to_root + |
827 | root_path_confirmation_jiffies(sdata)) || | |
828 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 829 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
830 | mhwmp_dbg(sdata, |
831 | "time to refresh root mpath %pM\n", | |
832 | orig_addr); | |
5ee68e5b | 833 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 834 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
835 | } |
836 | ||
7ebfa469 CYY |
837 | mpath->sn = orig_sn; |
838 | mpath->rann_metric = metric + metric_txsta; | |
839 | mpath->is_root = true; | |
840 | /* Recording RANNs sender address to send individually | |
841 | * addressed PREQs destined for root mesh STA */ | |
842 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
843 | ||
844 | if (root_is_gate) | |
845 | mesh_path_add_gate(mpath); | |
846 | ||
847 | if (ttl <= 1) { | |
848 | ifmsh->mshstats.dropped_frames_ttl++; | |
849 | rcu_read_unlock(); | |
850 | return; | |
851 | } | |
852 | ttl--; | |
853 | ||
854 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 855 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
f63f8421 CYY |
856 | orig_sn, 0, NULL, 0, broadcast_addr, |
857 | hopcount, ttl, interval, | |
858 | metric + metric_txsta, 0, sdata); | |
90a5e169 | 859 | } |
3d045a54 | 860 | |
90a5e169 RP |
861 | rcu_read_unlock(); |
862 | } | |
050ac52c LCC |
863 | |
864 | ||
f698d856 | 865 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 866 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c LCC |
867 | { |
868 | struct ieee802_11_elems elems; | |
869 | size_t baselen; | |
afd2efb9 | 870 | u32 path_metric; |
97091317 | 871 | struct sta_info *sta; |
050ac52c | 872 | |
9c80d3dc JB |
873 | /* need action_code */ |
874 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
875 | return; | |
876 | ||
97091317 JC |
877 | rcu_read_lock(); |
878 | sta = sta_info_get(sdata, mgmt->sa); | |
433f5bc1 | 879 | if (!sta || sta->mesh->plink_state != NL80211_PLINK_ESTAB) { |
97091317 JC |
880 | rcu_read_unlock(); |
881 | return; | |
882 | } | |
883 | rcu_read_unlock(); | |
884 | ||
050ac52c LCC |
885 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
886 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
b2e506bf | 887 | len - baselen, false, &elems); |
050ac52c | 888 | |
dbb81c42 RP |
889 | if (elems.preq) { |
890 | if (elems.preq_len != 37) | |
050ac52c LCC |
891 | /* Right now we support just 1 destination and no AE */ |
892 | return; | |
afd2efb9 AG |
893 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
894 | MPATH_PREQ); | |
895 | if (path_metric) | |
dbb81c42 | 896 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, |
afd2efb9 | 897 | path_metric); |
dbb81c42 RP |
898 | } |
899 | if (elems.prep) { | |
900 | if (elems.prep_len != 31) | |
050ac52c LCC |
901 | /* Right now we support no AE */ |
902 | return; | |
afd2efb9 AG |
903 | path_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
904 | MPATH_PREP); | |
905 | if (path_metric) | |
dbb81c42 | 906 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, |
afd2efb9 | 907 | path_metric); |
dbb81c42 RP |
908 | } |
909 | if (elems.perr) { | |
d611f062 | 910 | if (elems.perr_len != 15) |
050ac52c LCC |
911 | /* Right now we support only one destination per PERR */ |
912 | return; | |
f698d856 | 913 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 914 | } |
90a5e169 RP |
915 | if (elems.rann) |
916 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
917 | } |
918 | ||
919 | /** | |
920 | * mesh_queue_preq - queue a PREQ to a given destination | |
921 | * | |
922 | * @mpath: mesh path to discover | |
923 | * @flags: special attributes of the PREQ to be sent | |
924 | * | |
925 | * Locking: the function must be called from within a rcu read lock block. | |
926 | * | |
927 | */ | |
928 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
929 | { | |
f698d856 | 930 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 931 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
932 | struct mesh_preq_queue *preq_node; |
933 | ||
59615b5f | 934 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 935 | if (!preq_node) { |
bdcbd8e0 | 936 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
937 | return; |
938 | } | |
939 | ||
987dafad | 940 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 941 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 942 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
943 | kfree(preq_node); |
944 | if (printk_ratelimit()) | |
bdcbd8e0 | 945 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
946 | return; |
947 | } | |
948 | ||
f2dc7989 | 949 | spin_lock(&mpath->state_lock); |
f3011cf9 | 950 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 951 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 952 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 953 | kfree(preq_node); |
f3011cf9 JC |
954 | return; |
955 | } | |
956 | ||
050ac52c LCC |
957 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
958 | preq_node->flags = flags; | |
959 | ||
f3011cf9 | 960 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 961 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 962 | |
472dbc45 JB |
963 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
964 | ++ifmsh->preq_queue_len; | |
987dafad | 965 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 966 | |
472dbc45 | 967 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 968 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 969 | |
472dbc45 | 970 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
971 | /* avoid long wait if did not send preqs for a long time |
972 | * and jiffies wrapped around | |
973 | */ | |
472dbc45 | 974 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 975 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 976 | } else |
472dbc45 | 977 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
978 | min_preq_int_jiff(sdata)); |
979 | } | |
980 | ||
981 | /** | |
982 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
983 | * | |
f698d856 | 984 | * @sdata: local mesh subif |
050ac52c | 985 | */ |
f698d856 | 986 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 987 | { |
472dbc45 | 988 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
989 | struct mesh_preq_queue *preq_node; |
990 | struct mesh_path *mpath; | |
932e628d | 991 | u8 ttl, target_flags = 0; |
3d045a54 | 992 | const u8 *da; |
050ac52c LCC |
993 | u32 lifetime; |
994 | ||
a43816df | 995 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
996 | if (!ifmsh->preq_queue_len || |
997 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 998 | min_preq_int_jiff(sdata))) { |
a43816df | 999 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1000 | return; |
1001 | } | |
1002 | ||
472dbc45 | 1003 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
1004 | struct mesh_preq_queue, list); |
1005 | list_del(&preq_node->list); | |
472dbc45 | 1006 | --ifmsh->preq_queue_len; |
a43816df | 1007 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1008 | |
1009 | rcu_read_lock(); | |
bf7cd94d | 1010 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
1011 | if (!mpath) |
1012 | goto enddiscovery; | |
1013 | ||
1014 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 1015 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1016 | if (preq_node->flags & PREQ_Q_F_START) { |
1017 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1018 | spin_unlock_bh(&mpath->state_lock); | |
1019 | goto enddiscovery; | |
1020 | } else { | |
1021 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1022 | mpath->flags |= MESH_PATH_RESOLVING; | |
1023 | mpath->discovery_retries = 0; | |
1024 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1025 | } | |
1026 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1027 | mpath->flags & MESH_PATH_RESOLVED) { | |
1028 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1029 | spin_unlock_bh(&mpath->state_lock); | |
1030 | goto enddiscovery; | |
1031 | } | |
1032 | ||
472dbc45 | 1033 | ifmsh->last_preq = jiffies; |
050ac52c | 1034 | |
d19b3bf6 | 1035 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1036 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1037 | time_before(jiffies, ifmsh->last_sn_update)) { |
1038 | ++ifmsh->sn; | |
1039 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1040 | } |
1041 | lifetime = default_lifetime(sdata); | |
45904f21 | 1042 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1043 | if (ttl == 0) { |
472dbc45 | 1044 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1045 | spin_unlock_bh(&mpath->state_lock); |
1046 | goto enddiscovery; | |
1047 | } | |
1048 | ||
1049 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
932e628d | 1050 | target_flags |= IEEE80211_PREQ_TO_FLAG; |
050ac52c | 1051 | else |
932e628d | 1052 | target_flags &= ~IEEE80211_PREQ_TO_FLAG; |
050ac52c LCC |
1053 | |
1054 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1055 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
f63f8421 CYY |
1056 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, ifmsh->sn, |
1057 | target_flags, mpath->dst, mpath->sn, da, 0, | |
1058 | ttl, lifetime, 0, ifmsh->preq_id++, sdata); | |
050ac52c LCC |
1059 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1060 | ||
1061 | enddiscovery: | |
1062 | rcu_read_unlock(); | |
1063 | kfree(preq_node); | |
1064 | } | |
1065 | ||
2c53040f BH |
1066 | /** |
1067 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1068 | * |
e32f85f7 | 1069 | * @skb: 802.11 frame to be sent |
f698d856 | 1070 | * @sdata: network subif the frame will be sent through |
050ac52c | 1071 | * |
2c53040f BH |
1072 | * Lookup next hop for given skb and start path discovery if no |
1073 | * forwarding information is found. | |
1074 | * | |
0cfda851 TP |
1075 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1076 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1077 | */ |
bf7cd94d JB |
1078 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1079 | struct sk_buff *skb) | |
050ac52c | 1080 | { |
e32f85f7 | 1081 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1082 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1083 | struct mesh_path *mpath; | |
1084 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1085 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1086 | int err = 0; |
1087 | ||
3f52b7e3 MP |
1088 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1089 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1090 | return 0; | |
1091 | ||
050ac52c | 1092 | rcu_read_lock(); |
bf7cd94d | 1093 | err = mesh_nexthop_lookup(sdata, skb); |
0cfda851 TP |
1094 | if (!err) |
1095 | goto endlookup; | |
050ac52c | 1096 | |
0cfda851 | 1097 | /* no nexthop found, start resolving */ |
bf7cd94d | 1098 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1099 | if (!mpath) { |
ae76eef0 BC |
1100 | mpath = mesh_path_add(sdata, target_addr); |
1101 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1102 | mesh_path_discard_frame(sdata, skb); |
ae76eef0 | 1103 | err = PTR_ERR(mpath); |
050ac52c LCC |
1104 | goto endlookup; |
1105 | } | |
1106 | } | |
1107 | ||
0cfda851 TP |
1108 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1109 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1110 | ||
1111 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1112 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1113 | ||
1114 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1115 | ieee80211_set_qos_hdr(sdata, skb); | |
1116 | skb_queue_tail(&mpath->frame_queue, skb); | |
1117 | err = -ENOENT; | |
1118 | if (skb_to_free) | |
bf7cd94d | 1119 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 TP |
1120 | |
1121 | endlookup: | |
1122 | rcu_read_unlock(); | |
1123 | return err; | |
1124 | } | |
bf7cd94d | 1125 | |
0cfda851 TP |
1126 | /** |
1127 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1128 | * this function is considered "using" the associated mpath, so preempt a path | |
1129 | * refresh if this mpath expires soon. | |
1130 | * | |
1131 | * @skb: 802.11 frame to be sent | |
1132 | * @sdata: network subif the frame will be sent through | |
1133 | * | |
1134 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1135 | */ | |
bf7cd94d JB |
1136 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1137 | struct sk_buff *skb) | |
0cfda851 TP |
1138 | { |
1139 | struct mesh_path *mpath; | |
1140 | struct sta_info *next_hop; | |
1141 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1142 | u8 *target_addr = hdr->addr3; | |
1143 | int err = -ENOENT; | |
050ac52c | 1144 | |
0cfda851 | 1145 | rcu_read_lock(); |
bf7cd94d | 1146 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 TP |
1147 | |
1148 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1149 | goto endlookup; | |
1150 | ||
1151 | if (time_after(jiffies, | |
1152 | mpath->exp_time - | |
1153 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1154 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1155 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1156 | !(mpath->flags & MESH_PATH_FIXED)) | |
1157 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1158 | |
0cfda851 TP |
1159 | next_hop = rcu_dereference(mpath->next_hop); |
1160 | if (next_hop) { | |
1161 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1162 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
3f52b7e3 | 1163 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
0cfda851 | 1164 | err = 0; |
050ac52c LCC |
1165 | } |
1166 | ||
1167 | endlookup: | |
1168 | rcu_read_unlock(); | |
1169 | return err; | |
1170 | } | |
1171 | ||
1172 | void mesh_path_timer(unsigned long data) | |
1173 | { | |
dea4096b JB |
1174 | struct mesh_path *mpath = (void *) data; |
1175 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1176 | int ret; |
5bb644a0 | 1177 | |
dea4096b | 1178 | if (sdata->local->quiescing) |
5bb644a0 | 1179 | return; |
5bb644a0 JB |
1180 | |
1181 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1182 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1183 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1184 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1185 | spin_unlock_bh(&mpath->state_lock); |
1186 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1187 | ++mpath->discovery_retries; |
1188 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1189 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1190 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1191 | mesh_queue_preq(mpath, 0); |
1192 | } else { | |
d8254710 JJ |
1193 | mpath->flags &= ~(MESH_PATH_RESOLVING | |
1194 | MESH_PATH_RESOLVED | | |
1195 | MESH_PATH_REQ_QUEUED); | |
050ac52c | 1196 | mpath->exp_time = jiffies; |
5ee68e5b JC |
1197 | spin_unlock_bh(&mpath->state_lock); |
1198 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1199 | ret = mesh_path_send_to_gates(mpath); | |
1200 | if (ret) | |
bdcbd8e0 | 1201 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1202 | } else |
1203 | mesh_path_flush_pending(mpath); | |
050ac52c | 1204 | } |
050ac52c | 1205 | } |
e304bfd3 | 1206 | |
bf7cd94d | 1207 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
1208 | { |
1209 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1210 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1211 | u8 flags, target_flags = 0; |
e304bfd3 | 1212 | |
16dd7267 JC |
1213 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1214 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1215 | |
1216 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1217 | case IEEE80211_PROACTIVE_RANN: | |
1218 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
f63f8421 CYY |
1219 | ++ifmsh->sn, 0, NULL, 0, broadcast_addr, |
1220 | 0, ifmsh->mshcfg.element_ttl, | |
1221 | interval, 0, 0, sdata); | |
a69cc44f CYY |
1222 | break; |
1223 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1224 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1225 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1226 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1227 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1228 | IEEE80211_PREQ_USN_FLAG; | |
1229 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
f63f8421 CYY |
1230 | ++ifmsh->sn, target_flags, |
1231 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1232 | 0, ifmsh->mshcfg.element_ttl, interval, | |
1233 | 0, ifmsh->preq_id++, sdata); | |
a69cc44f CYY |
1234 | break; |
1235 | default: | |
bdcbd8e0 | 1236 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1237 | return; |
1238 | } | |
e304bfd3 | 1239 | } |