Commit | Line | Data |
---|---|---|
050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
888d04df | 11 | #include <linux/etherdevice.h> |
d26ad377 | 12 | #include <asm/unaligned.h> |
2cca397f | 13 | #include "wme.h" |
050ac52c LCC |
14 | #include "mesh.h" |
15 | ||
050ac52c LCC |
16 | #define TEST_FRAME_LEN 8192 |
17 | #define MAX_METRIC 0xffffffff | |
18 | #define ARITH_SHIFT 8 | |
19 | ||
050ac52c LCC |
20 | #define MAX_PREQ_QUEUE_LEN 64 |
21 | ||
22 | /* Destination only */ | |
23 | #define MP_F_DO 0x1 | |
24 | /* Reply and forward */ | |
25 | #define MP_F_RF 0x2 | |
d611f062 RP |
26 | /* Unknown Sequence Number */ |
27 | #define MP_F_USN 0x01 | |
28 | /* Reason code Present */ | |
29 | #define MP_F_RCODE 0x02 | |
050ac52c | 30 | |
90a5e169 RP |
31 | static void mesh_queue_preq(struct mesh_path *, u8); |
32 | ||
4a3cb702 | 33 | static inline u32 u32_field_get(const u8 *preq_elem, int offset, bool ae) |
a00de5d0 LCC |
34 | { |
35 | if (ae) | |
36 | offset += 6; | |
ae7245cb | 37 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
38 | } |
39 | ||
4a3cb702 | 40 | static inline u32 u16_field_get(const u8 *preq_elem, int offset, bool ae) |
d611f062 RP |
41 | { |
42 | if (ae) | |
43 | offset += 6; | |
44 | return get_unaligned_le16(preq_elem + offset); | |
45 | } | |
46 | ||
050ac52c | 47 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
48 | #define AE_F (1<<6) |
49 | #define AE_F_SET(x) (*x & AE_F) | |
50 | #define PREQ_IE_FLAGS(x) (*(x)) | |
51 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
52 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
53 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
54 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
55 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
56 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
57 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
58 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
59 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 60 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
61 | |
62 | ||
63 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
64 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
65 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
66 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
67 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
68 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
69 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
70 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
71 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 72 | |
d611f062 | 73 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
74 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
75 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
76 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
77 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 78 | |
050ac52c | 79 | #define MSEC_TO_TU(x) (x*1000/1024) |
d2a079fd CYY |
80 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
81 | #define SN_LT(x, y) ((s32)(x - y) < 0) | |
050ac52c LCC |
82 | |
83 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 84 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 85 | #define default_lifetime(s) \ |
472dbc45 | 86 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 87 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
88 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
89 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 90 | #define disc_timeout_jiff(s) \ |
472dbc45 | 91 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
728b19e5 CYY |
92 | #define root_path_confirmation_jiffies(s) \ |
93 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
94 | |
95 | enum mpath_frame_type { | |
96 | MPATH_PREQ = 0, | |
97 | MPATH_PREP, | |
90a5e169 RP |
98 | MPATH_PERR, |
99 | MPATH_RANN | |
050ac52c LCC |
100 | }; |
101 | ||
15ff6365 JB |
102 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
103 | ||
050ac52c | 104 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
4a3cb702 JB |
105 | const u8 *orig_addr, __le32 orig_sn, |
106 | u8 target_flags, const u8 *target, | |
107 | __le32 target_sn, const u8 *da, | |
108 | u8 hop_count, u8 ttl, | |
109 | __le32 lifetime, __le32 metric, | |
110 | __le32 preq_id, | |
111 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 112 | { |
f698d856 | 113 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 114 | struct sk_buff *skb; |
050ac52c | 115 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
116 | u8 *pos, ie_len; |
117 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
118 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 119 | |
65e8b0cc | 120 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
121 | hdr_len + |
122 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
123 | if (!skb) |
124 | return -1; | |
65e8b0cc | 125 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
126 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
127 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
128 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
129 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
130 | |
131 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 132 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 133 | /* BSSID == SA */ |
47846c9b | 134 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
135 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
136 | mgmt->u.action.u.mesh_action.action_code = | |
137 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
138 | |
139 | switch (action) { | |
140 | case MPATH_PREQ: | |
bdcbd8e0 | 141 | mhwmp_dbg(sdata, "sending PREQ to %pM\n", target); |
050ac52c LCC |
142 | ie_len = 37; |
143 | pos = skb_put(skb, 2 + ie_len); | |
144 | *pos++ = WLAN_EID_PREQ; | |
145 | break; | |
146 | case MPATH_PREP: | |
0f71651f | 147 | mhwmp_dbg(sdata, "sending PREP to %pM\n", orig_addr); |
050ac52c LCC |
148 | ie_len = 31; |
149 | pos = skb_put(skb, 2 + ie_len); | |
150 | *pos++ = WLAN_EID_PREP; | |
151 | break; | |
90a5e169 | 152 | case MPATH_RANN: |
bdcbd8e0 | 153 | mhwmp_dbg(sdata, "sending RANN from %pM\n", orig_addr); |
90a5e169 RP |
154 | ie_len = sizeof(struct ieee80211_rann_ie); |
155 | pos = skb_put(skb, 2 + ie_len); | |
156 | *pos++ = WLAN_EID_RANN; | |
157 | break; | |
050ac52c | 158 | default: |
812714d7 | 159 | kfree_skb(skb); |
050ac52c LCC |
160 | return -ENOTSUPP; |
161 | break; | |
162 | } | |
163 | *pos++ = ie_len; | |
164 | *pos++ = flags; | |
165 | *pos++ = hop_count; | |
166 | *pos++ = ttl; | |
25d49e4d TP |
167 | if (action == MPATH_PREP) { |
168 | memcpy(pos, target, ETH_ALEN); | |
169 | pos += ETH_ALEN; | |
170 | memcpy(pos, &target_sn, 4); | |
050ac52c | 171 | pos += 4; |
25d49e4d TP |
172 | } else { |
173 | if (action == MPATH_PREQ) { | |
174 | memcpy(pos, &preq_id, 4); | |
175 | pos += 4; | |
176 | } | |
177 | memcpy(pos, orig_addr, ETH_ALEN); | |
178 | pos += ETH_ALEN; | |
179 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
180 | pos += 4; |
181 | } | |
25d49e4d TP |
182 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
183 | pos += 4; | |
050ac52c LCC |
184 | memcpy(pos, &metric, 4); |
185 | pos += 4; | |
186 | if (action == MPATH_PREQ) { | |
25d49e4d | 187 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 188 | *pos++ = target_flags; |
d19b3bf6 | 189 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 190 | pos += ETH_ALEN; |
d19b3bf6 | 191 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
192 | pos += 4; |
193 | } else if (action == MPATH_PREP) { | |
194 | memcpy(pos, orig_addr, ETH_ALEN); | |
195 | pos += ETH_ALEN; | |
196 | memcpy(pos, &orig_sn, 4); | |
197 | pos += 4; | |
90a5e169 | 198 | } |
050ac52c | 199 | |
62ae67be | 200 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
201 | return 0; |
202 | } | |
203 | ||
2cca397f JC |
204 | |
205 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
206 | * headroom in case the frame is encrypted. */ | |
207 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
208 | struct sk_buff *skb) | |
209 | { | |
2cca397f | 210 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
3f52b7e3 | 211 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
2cca397f JC |
212 | |
213 | skb_set_mac_header(skb, 0); | |
214 | skb_set_network_header(skb, 0); | |
215 | skb_set_transport_header(skb, 0); | |
216 | ||
217 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
218 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
219 | skb->priority = 7; | |
220 | ||
221 | info->control.vif = &sdata->vif; | |
9cbbffe2 | 222 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
2154c81c | 223 | ieee80211_set_qos_hdr(sdata, skb); |
3f52b7e3 | 224 | ieee80211_mps_set_frame_flags(sdata, NULL, hdr); |
2cca397f JC |
225 | } |
226 | ||
050ac52c | 227 | /** |
75ea719c | 228 | * mesh_path_error_tx - Sends a PERR mesh management frame |
050ac52c | 229 | * |
75ea719c | 230 | * @ttl: allowed remaining hops |
d19b3bf6 RP |
231 | * @target: broken destination |
232 | * @target_sn: SN of the broken destination | |
233 | * @target_rcode: reason code for this PERR | |
050ac52c | 234 | * @ra: node this frame is addressed to |
75ea719c | 235 | * @sdata: local mesh subif |
2cca397f JC |
236 | * |
237 | * Note: This function may be called with driver locks taken that the driver | |
238 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
239 | * frame directly but add it to the pending queue instead. | |
050ac52c | 240 | */ |
bf7cd94d JB |
241 | int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, |
242 | u8 ttl, const u8 *target, __le32 target_sn, | |
243 | __le16 target_rcode, const u8 *ra) | |
050ac52c | 244 | { |
f698d856 | 245 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 246 | struct sk_buff *skb; |
dca7e943 | 247 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 248 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
249 | u8 *pos, ie_len; |
250 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
251 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 252 | |
dca7e943 TP |
253 | if (time_before(jiffies, ifmsh->next_perr)) |
254 | return -EAGAIN; | |
255 | ||
65e8b0cc | 256 | skb = dev_alloc_skb(local->tx_headroom + |
8680451f BC |
257 | IEEE80211_ENCRYPT_HEADROOM + |
258 | IEEE80211_ENCRYPT_TAILROOM + | |
3b69a9c5 TP |
259 | hdr_len + |
260 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
261 | if (!skb) |
262 | return -1; | |
8680451f | 263 | skb_reserve(skb, local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); |
3b69a9c5 TP |
264 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
265 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
266 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
267 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
268 | |
269 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 270 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
271 | /* BSSID == SA */ |
272 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
273 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
274 | mgmt->u.action.u.mesh_action.action_code = | |
275 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 276 | ie_len = 15; |
050ac52c LCC |
277 | pos = skb_put(skb, 2 + ie_len); |
278 | *pos++ = WLAN_EID_PERR; | |
279 | *pos++ = ie_len; | |
d611f062 | 280 | /* ttl */ |
45904f21 | 281 | *pos++ = ttl; |
050ac52c LCC |
282 | /* number of destinations */ |
283 | *pos++ = 1; | |
d611f062 RP |
284 | /* |
285 | * flags bit, bit 1 is unset if we know the sequence number and | |
286 | * bit 2 is set if we have a reason code | |
287 | */ | |
288 | *pos = 0; | |
d19b3bf6 | 289 | if (!target_sn) |
d611f062 | 290 | *pos |= MP_F_USN; |
d19b3bf6 | 291 | if (target_rcode) |
d611f062 RP |
292 | *pos |= MP_F_RCODE; |
293 | pos++; | |
d19b3bf6 | 294 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 295 | pos += ETH_ALEN; |
d19b3bf6 | 296 | memcpy(pos, &target_sn, 4); |
d611f062 | 297 | pos += 4; |
d19b3bf6 | 298 | memcpy(pos, &target_rcode, 2); |
050ac52c | 299 | |
2cca397f JC |
300 | /* see note in function header */ |
301 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
302 | ifmsh->next_perr = TU_TO_EXP_TIME( |
303 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 304 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
305 | return 0; |
306 | } | |
307 | ||
bfc32e6a | 308 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 309 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
310 | { |
311 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
312 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
313 | int failed; | |
314 | ||
315 | if (!ieee80211_is_data(hdr->frame_control)) | |
316 | return; | |
317 | ||
318 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
319 | ||
320 | /* moving average, scaled to 100 */ | |
35b3fe1c JC |
321 | sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); |
322 | if (sta->fail_avg > 95) | |
323 | mesh_plink_broken(sta); | |
bfc32e6a JC |
324 | } |
325 | ||
050ac52c LCC |
326 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
327 | struct sta_info *sta) | |
328 | { | |
6b62bf32 | 329 | struct rate_info rinfo; |
050ac52c LCC |
330 | /* This should be adjusted for each device */ |
331 | int device_constant = 1 << ARITH_SHIFT; | |
332 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
333 | int s_unit = 1 << ARITH_SHIFT; | |
334 | int rate, err; | |
335 | u32 tx_time, estimated_retx; | |
336 | u64 result; | |
337 | ||
050ac52c LCC |
338 | if (sta->fail_avg >= 100) |
339 | return MAX_METRIC; | |
e6a9854b | 340 | |
6b62bf32 TP |
341 | sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); |
342 | rate = cfg80211_calculate_bitrate(&rinfo); | |
343 | if (WARN_ON(!rate)) | |
e6a9854b JB |
344 | return MAX_METRIC; |
345 | ||
050ac52c LCC |
346 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
347 | ||
348 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
349 | * 1Mbps. This will be corrected on tx_time computation. | |
350 | */ | |
050ac52c LCC |
351 | tx_time = (device_constant + 10 * test_frame_len / rate); |
352 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
353 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
354 | return (u32)result; | |
355 | } | |
356 | ||
357 | /** | |
358 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
359 | * | |
f698d856 | 360 | * @sdata: local mesh subif |
050ac52c LCC |
361 | * @mgmt: mesh management frame |
362 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
75ea719c | 363 | * @action: type of hwmp ie |
050ac52c LCC |
364 | * |
365 | * This function updates the path routing information to the originator and the | |
f99288d1 | 366 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
367 | * |
368 | * Returns: metric to frame originator or 0 if the frame should not be further | |
369 | * processed | |
370 | * | |
371 | * Notes: this function is the only place (besides user-provided info) where | |
372 | * path routing information is updated. | |
373 | */ | |
f698d856 | 374 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
375 | struct ieee80211_mgmt *mgmt, |
376 | const u8 *hwmp_ie, enum mpath_frame_type action) | |
050ac52c | 377 | { |
f698d856 | 378 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
379 | struct mesh_path *mpath; |
380 | struct sta_info *sta; | |
381 | bool fresh_info; | |
4a3cb702 | 382 | const u8 *orig_addr, *ta; |
d19b3bf6 | 383 | u32 orig_sn, orig_metric; |
050ac52c LCC |
384 | unsigned long orig_lifetime, exp_time; |
385 | u32 last_hop_metric, new_metric; | |
386 | bool process = true; | |
050ac52c LCC |
387 | |
388 | rcu_read_lock(); | |
abe60632 | 389 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
390 | if (!sta) { |
391 | rcu_read_unlock(); | |
050ac52c | 392 | return 0; |
dc0b0f7d | 393 | } |
050ac52c LCC |
394 | |
395 | last_hop_metric = airtime_link_metric_get(local, sta); | |
396 | /* Update and check originator routing info */ | |
397 | fresh_info = true; | |
398 | ||
399 | switch (action) { | |
400 | case MPATH_PREQ: | |
401 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 402 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
403 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
404 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
405 | break; | |
406 | case MPATH_PREP: | |
3c26f1f6 TP |
407 | /* Originator here refers to the MP that was the target in the |
408 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
409 | * so that we can easily use a single function to gather path |
410 | * information from both PREQ and PREP frames. | |
411 | */ | |
3c26f1f6 TP |
412 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
413 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
414 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
415 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
416 | break; | |
417 | default: | |
dc0b0f7d | 418 | rcu_read_unlock(); |
050ac52c LCC |
419 | return 0; |
420 | } | |
421 | new_metric = orig_metric + last_hop_metric; | |
422 | if (new_metric < orig_metric) | |
423 | new_metric = MAX_METRIC; | |
424 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
425 | ||
b203ca39 | 426 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
427 | /* This MP is the originator, we are not interested in this |
428 | * frame, except for updating transmitter's path info. | |
429 | */ | |
430 | process = false; | |
431 | fresh_info = false; | |
432 | } else { | |
bf7cd94d | 433 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
434 | if (mpath) { |
435 | spin_lock_bh(&mpath->state_lock); | |
436 | if (mpath->flags & MESH_PATH_FIXED) | |
437 | fresh_info = false; | |
438 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
439 | (mpath->flags & MESH_PATH_SN_VALID)) { |
440 | if (SN_GT(mpath->sn, orig_sn) || | |
441 | (mpath->sn == orig_sn && | |
533866b1 | 442 | new_metric >= mpath->metric)) { |
050ac52c LCC |
443 | process = false; |
444 | fresh_info = false; | |
445 | } | |
446 | } | |
447 | } else { | |
ae76eef0 BC |
448 | mpath = mesh_path_add(sdata, orig_addr); |
449 | if (IS_ERR(mpath)) { | |
050ac52c | 450 | rcu_read_unlock(); |
050ac52c LCC |
451 | return 0; |
452 | } | |
453 | spin_lock_bh(&mpath->state_lock); | |
454 | } | |
455 | ||
456 | if (fresh_info) { | |
457 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 458 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 459 | mpath->metric = new_metric; |
d19b3bf6 | 460 | mpath->sn = orig_sn; |
050ac52c LCC |
461 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
462 | ? mpath->exp_time : exp_time; | |
463 | mesh_path_activate(mpath); | |
464 | spin_unlock_bh(&mpath->state_lock); | |
465 | mesh_path_tx_pending(mpath); | |
466 | /* draft says preq_id should be saved to, but there does | |
467 | * not seem to be any use for it, skipping by now | |
468 | */ | |
469 | } else | |
470 | spin_unlock_bh(&mpath->state_lock); | |
471 | } | |
472 | ||
473 | /* Update and check transmitter routing info */ | |
474 | ta = mgmt->sa; | |
b203ca39 | 475 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
476 | fresh_info = false; |
477 | else { | |
478 | fresh_info = true; | |
479 | ||
bf7cd94d | 480 | mpath = mesh_path_lookup(sdata, ta); |
050ac52c LCC |
481 | if (mpath) { |
482 | spin_lock_bh(&mpath->state_lock); | |
483 | if ((mpath->flags & MESH_PATH_FIXED) || | |
484 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
485 | (last_hop_metric > mpath->metric))) | |
486 | fresh_info = false; | |
487 | } else { | |
ae76eef0 BC |
488 | mpath = mesh_path_add(sdata, ta); |
489 | if (IS_ERR(mpath)) { | |
050ac52c | 490 | rcu_read_unlock(); |
050ac52c LCC |
491 | return 0; |
492 | } | |
493 | spin_lock_bh(&mpath->state_lock); | |
494 | } | |
495 | ||
496 | if (fresh_info) { | |
497 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
498 | mpath->metric = last_hop_metric; |
499 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
500 | ? mpath->exp_time : exp_time; | |
501 | mesh_path_activate(mpath); | |
502 | spin_unlock_bh(&mpath->state_lock); | |
503 | mesh_path_tx_pending(mpath); | |
504 | } else | |
505 | spin_unlock_bh(&mpath->state_lock); | |
506 | } | |
507 | ||
050ac52c LCC |
508 | rcu_read_unlock(); |
509 | ||
510 | return process ? new_metric : 0; | |
511 | } | |
512 | ||
f698d856 | 513 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 514 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 515 | const u8 *preq_elem, u32 metric) |
57ef5ddb | 516 | { |
472dbc45 | 517 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 518 | struct mesh_path *mpath = NULL; |
4a3cb702 | 519 | const u8 *target_addr, *orig_addr; |
3d045a54 | 520 | const u8 *da; |
3fbf4b71 CYY |
521 | u8 target_flags, ttl, flags; |
522 | u32 orig_sn, target_sn, lifetime, orig_metric; | |
050ac52c LCC |
523 | bool reply = false; |
524 | bool forward = true; | |
3fbf4b71 | 525 | bool root_is_gate; |
050ac52c | 526 | |
d19b3bf6 RP |
527 | /* Update target SN, if present */ |
528 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
050ac52c | 529 | orig_addr = PREQ_IE_ORIG_ADDR(preq_elem); |
d19b3bf6 RP |
530 | target_sn = PREQ_IE_TARGET_SN(preq_elem); |
531 | orig_sn = PREQ_IE_ORIG_SN(preq_elem); | |
532 | target_flags = PREQ_IE_TARGET_F(preq_elem); | |
3fbf4b71 CYY |
533 | orig_metric = metric; |
534 | /* Proactive PREQ gate announcements */ | |
535 | flags = PREQ_IE_FLAGS(preq_elem); | |
536 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); | |
050ac52c | 537 | |
bdcbd8e0 | 538 | mhwmp_dbg(sdata, "received PREQ from %pM\n", orig_addr); |
27db2e42 | 539 | |
b203ca39 | 540 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
bdcbd8e0 | 541 | mhwmp_dbg(sdata, "PREQ is for us\n"); |
050ac52c LCC |
542 | forward = false; |
543 | reply = true; | |
544 | metric = 0; | |
d19b3bf6 | 545 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 546 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
547 | time_before(jiffies, ifmsh->last_sn_update)) { |
548 | target_sn = ++ifmsh->sn; | |
549 | ifmsh->last_sn_update = jiffies; | |
050ac52c | 550 | } |
3fbf4b71 CYY |
551 | } else if (is_broadcast_ether_addr(target_addr) && |
552 | (target_flags & IEEE80211_PREQ_TO_FLAG)) { | |
553 | rcu_read_lock(); | |
bf7cd94d | 554 | mpath = mesh_path_lookup(sdata, orig_addr); |
3fbf4b71 CYY |
555 | if (mpath) { |
556 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
557 | reply = true; | |
558 | target_addr = sdata->vif.addr; | |
559 | target_sn = ++ifmsh->sn; | |
560 | metric = 0; | |
561 | ifmsh->last_sn_update = jiffies; | |
562 | } | |
563 | if (root_is_gate) | |
564 | mesh_path_add_gate(mpath); | |
565 | } | |
566 | rcu_read_unlock(); | |
050ac52c LCC |
567 | } else { |
568 | rcu_read_lock(); | |
bf7cd94d | 569 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 570 | if (mpath) { |
d19b3bf6 RP |
571 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
572 | SN_LT(mpath->sn, target_sn)) { | |
573 | mpath->sn = target_sn; | |
574 | mpath->flags |= MESH_PATH_SN_VALID; | |
575 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
576 | (mpath->flags & MESH_PATH_ACTIVE)) { |
577 | reply = true; | |
578 | metric = mpath->metric; | |
d19b3bf6 RP |
579 | target_sn = mpath->sn; |
580 | if (target_flags & MP_F_RF) | |
581 | target_flags |= MP_F_DO; | |
050ac52c LCC |
582 | else |
583 | forward = false; | |
584 | } | |
585 | } | |
586 | rcu_read_unlock(); | |
587 | } | |
588 | ||
589 | if (reply) { | |
590 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 591 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 592 | if (ttl != 0) { |
bdcbd8e0 | 593 | mhwmp_dbg(sdata, "replying to the PREQ\n"); |
3c26f1f6 TP |
594 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
595 | cpu_to_le32(orig_sn), 0, target_addr, | |
596 | cpu_to_le32(target_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 597 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 598 | 0, sdata); |
3fbf4b71 | 599 | } else { |
472dbc45 | 600 | ifmsh->mshstats.dropped_frames_ttl++; |
3fbf4b71 | 601 | } |
050ac52c LCC |
602 | } |
603 | ||
94f90656 | 604 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c | 605 | u32 preq_id; |
3fbf4b71 | 606 | u8 hopcount; |
050ac52c LCC |
607 | |
608 | ttl = PREQ_IE_TTL(preq_elem); | |
609 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
610 | if (ttl <= 1) { | |
472dbc45 | 611 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
612 | return; |
613 | } | |
bdcbd8e0 | 614 | mhwmp_dbg(sdata, "forwarding the PREQ from %pM\n", orig_addr); |
050ac52c | 615 | --ttl; |
050ac52c LCC |
616 | preq_id = PREQ_IE_PREQ_ID(preq_elem); |
617 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
618 | da = (mpath && mpath->is_root) ? |
619 | mpath->rann_snd_addr : broadcast_addr; | |
3fbf4b71 CYY |
620 | |
621 | if (flags & IEEE80211_PREQ_PROACTIVE_PREP_FLAG) { | |
622 | target_addr = PREQ_IE_TARGET_ADDR(preq_elem); | |
623 | target_sn = PREQ_IE_TARGET_SN(preq_elem); | |
624 | metric = orig_metric; | |
625 | } | |
626 | ||
050ac52c | 627 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
d19b3bf6 | 628 | cpu_to_le32(orig_sn), target_flags, target_addr, |
3d045a54 | 629 | cpu_to_le32(target_sn), da, |
aa2b5928 LCC |
630 | hopcount, ttl, cpu_to_le32(lifetime), |
631 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 632 | sdata); |
7d4e15b1 CYY |
633 | if (!is_multicast_ether_addr(da)) |
634 | ifmsh->mshstats.fwded_unicast++; | |
635 | else | |
636 | ifmsh->mshstats.fwded_mcast++; | |
472dbc45 | 637 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
638 | } |
639 | } | |
640 | ||
641 | ||
40b275b6 JB |
642 | static inline struct sta_info * |
643 | next_hop_deref_protected(struct mesh_path *mpath) | |
644 | { | |
645 | return rcu_dereference_protected(mpath->next_hop, | |
646 | lockdep_is_held(&mpath->state_lock)); | |
647 | } | |
648 | ||
649 | ||
f698d856 | 650 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 651 | struct ieee80211_mgmt *mgmt, |
4a3cb702 | 652 | const u8 *prep_elem, u32 metric) |
050ac52c | 653 | { |
d665508b | 654 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 655 | struct mesh_path *mpath; |
4a3cb702 | 656 | const u8 *target_addr, *orig_addr; |
050ac52c LCC |
657 | u8 ttl, hopcount, flags; |
658 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 659 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 660 | |
bdcbd8e0 | 661 | mhwmp_dbg(sdata, "received PREP from %pM\n", |
0f71651f | 662 | PREP_IE_TARGET_ADDR(prep_elem)); |
dbb81c42 | 663 | |
3c26f1f6 | 664 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 665 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
666 | /* destination, no forwarding required */ |
667 | return; | |
668 | ||
d665508b CYY |
669 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
670 | return; | |
671 | ||
050ac52c LCC |
672 | ttl = PREP_IE_TTL(prep_elem); |
673 | if (ttl <= 1) { | |
472dbc45 | 674 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
675 | return; |
676 | } | |
677 | ||
678 | rcu_read_lock(); | |
bf7cd94d | 679 | mpath = mesh_path_lookup(sdata, orig_addr); |
050ac52c LCC |
680 | if (mpath) |
681 | spin_lock_bh(&mpath->state_lock); | |
682 | else | |
683 | goto fail; | |
684 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
685 | spin_unlock_bh(&mpath->state_lock); | |
686 | goto fail; | |
687 | } | |
40b275b6 | 688 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
689 | spin_unlock_bh(&mpath->state_lock); |
690 | --ttl; | |
691 | flags = PREP_IE_FLAGS(prep_elem); | |
692 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
693 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 694 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
695 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
696 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
697 | |
698 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 699 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 700 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 701 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 702 | 0, sdata); |
050ac52c | 703 | rcu_read_unlock(); |
c8a61a7d DW |
704 | |
705 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 706 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
707 | return; |
708 | ||
709 | fail: | |
710 | rcu_read_unlock(); | |
472dbc45 | 711 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
712 | } |
713 | ||
f698d856 | 714 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
715 | struct ieee80211_mgmt *mgmt, |
716 | const u8 *perr_elem) | |
050ac52c | 717 | { |
d611f062 | 718 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 719 | struct mesh_path *mpath; |
d611f062 | 720 | u8 ttl; |
4a3cb702 | 721 | const u8 *ta, *target_addr; |
d19b3bf6 RP |
722 | u32 target_sn; |
723 | u16 target_rcode; | |
050ac52c LCC |
724 | |
725 | ta = mgmt->sa; | |
d611f062 RP |
726 | ttl = PERR_IE_TTL(perr_elem); |
727 | if (ttl <= 1) { | |
728 | ifmsh->mshstats.dropped_frames_ttl++; | |
729 | return; | |
730 | } | |
731 | ttl--; | |
d19b3bf6 RP |
732 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
733 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
734 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 735 | |
050ac52c | 736 | rcu_read_lock(); |
bf7cd94d | 737 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 738 | if (mpath) { |
888d04df FF |
739 | struct sta_info *sta; |
740 | ||
050ac52c | 741 | spin_lock_bh(&mpath->state_lock); |
888d04df | 742 | sta = next_hop_deref_protected(mpath); |
050ac52c | 743 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 744 | ether_addr_equal(ta, sta->sta.addr) && |
d19b3bf6 RP |
745 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
746 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 747 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 748 | mpath->sn = target_sn; |
050ac52c | 749 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
750 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
751 | goto endperr; | |
bf7cd94d JB |
752 | mesh_path_error_tx(sdata, ttl, target_addr, |
753 | cpu_to_le32(target_sn), | |
d19b3bf6 | 754 | cpu_to_le16(target_rcode), |
bf7cd94d | 755 | broadcast_addr); |
050ac52c LCC |
756 | } else |
757 | spin_unlock_bh(&mpath->state_lock); | |
758 | } | |
d665508b | 759 | endperr: |
050ac52c LCC |
760 | rcu_read_unlock(); |
761 | } | |
762 | ||
90a5e169 | 763 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
4a3cb702 JB |
764 | struct ieee80211_mgmt *mgmt, |
765 | const struct ieee80211_rann_ie *rann) | |
90a5e169 RP |
766 | { |
767 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
768 | struct ieee80211_local *local = sdata->local; |
769 | struct sta_info *sta; | |
90a5e169 | 770 | struct mesh_path *mpath; |
90a5e169 | 771 | u8 ttl, flags, hopcount; |
4a3cb702 | 772 | const u8 *orig_addr; |
d2a079fd | 773 | u32 orig_sn, metric, metric_txsta, interval; |
5ee68e5b | 774 | bool root_is_gate; |
90a5e169 | 775 | |
90a5e169 | 776 | ttl = rann->rann_ttl; |
90a5e169 | 777 | flags = rann->rann_flags; |
5ee68e5b | 778 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 779 | orig_addr = rann->rann_addr; |
292c41ac | 780 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 781 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 782 | hopcount = rann->rann_hopcount; |
a6a58b4f | 783 | hopcount++; |
292c41ac | 784 | metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
785 | |
786 | /* Ignore our own RANNs */ | |
b203ca39 | 787 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
788 | return; |
789 | ||
bdcbd8e0 JB |
790 | mhwmp_dbg(sdata, |
791 | "received RANN from %pM via neighbour %pM (is_gate=%d)\n", | |
792 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
793 | |
794 | rcu_read_lock(); | |
d2a079fd CYY |
795 | sta = sta_info_get(sdata, mgmt->sa); |
796 | if (!sta) { | |
797 | rcu_read_unlock(); | |
798 | return; | |
799 | } | |
800 | ||
801 | metric_txsta = airtime_link_metric_get(local, sta); | |
802 | ||
bf7cd94d | 803 | mpath = mesh_path_lookup(sdata, orig_addr); |
90a5e169 | 804 | if (!mpath) { |
ae76eef0 BC |
805 | mpath = mesh_path_add(sdata, orig_addr); |
806 | if (IS_ERR(mpath)) { | |
90a5e169 RP |
807 | rcu_read_unlock(); |
808 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
809 | return; | |
810 | } | |
90a5e169 | 811 | } |
5ee68e5b | 812 | |
7ebfa469 CYY |
813 | if (!(SN_LT(mpath->sn, orig_sn)) && |
814 | !(mpath->sn == orig_sn && metric < mpath->rann_metric)) { | |
815 | rcu_read_unlock(); | |
816 | return; | |
817 | } | |
818 | ||
5ee68e5b | 819 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || |
728b19e5 CYY |
820 | (time_after(jiffies, mpath->last_preq_to_root + |
821 | root_path_confirmation_jiffies(sdata)) || | |
822 | time_before(jiffies, mpath->last_preq_to_root))) && | |
7ebfa469 | 823 | !(mpath->flags & MESH_PATH_FIXED) && (ttl != 0)) { |
bdcbd8e0 JB |
824 | mhwmp_dbg(sdata, |
825 | "time to refresh root mpath %pM\n", | |
826 | orig_addr); | |
5ee68e5b | 827 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); |
728b19e5 | 828 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
829 | } |
830 | ||
7ebfa469 CYY |
831 | mpath->sn = orig_sn; |
832 | mpath->rann_metric = metric + metric_txsta; | |
833 | mpath->is_root = true; | |
834 | /* Recording RANNs sender address to send individually | |
835 | * addressed PREQs destined for root mesh STA */ | |
836 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
837 | ||
838 | if (root_is_gate) | |
839 | mesh_path_add_gate(mpath); | |
840 | ||
841 | if (ttl <= 1) { | |
842 | ifmsh->mshstats.dropped_frames_ttl++; | |
843 | rcu_read_unlock(); | |
844 | return; | |
845 | } | |
846 | ttl--; | |
847 | ||
848 | if (ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 849 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 850 | cpu_to_le32(orig_sn), |
15ff6365 | 851 | 0, NULL, 0, broadcast_addr, |
0507e159 | 852 | hopcount, ttl, cpu_to_le32(interval), |
d2a079fd | 853 | cpu_to_le32(metric + metric_txsta), |
90a5e169 | 854 | 0, sdata); |
90a5e169 | 855 | } |
3d045a54 | 856 | |
90a5e169 RP |
857 | rcu_read_unlock(); |
858 | } | |
050ac52c LCC |
859 | |
860 | ||
f698d856 | 861 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
bf7cd94d | 862 | struct ieee80211_mgmt *mgmt, size_t len) |
050ac52c LCC |
863 | { |
864 | struct ieee802_11_elems elems; | |
865 | size_t baselen; | |
866 | u32 last_hop_metric; | |
97091317 | 867 | struct sta_info *sta; |
050ac52c | 868 | |
9c80d3dc JB |
869 | /* need action_code */ |
870 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
871 | return; | |
872 | ||
97091317 JC |
873 | rcu_read_lock(); |
874 | sta = sta_info_get(sdata, mgmt->sa); | |
875 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
876 | rcu_read_unlock(); | |
877 | return; | |
878 | } | |
879 | rcu_read_unlock(); | |
880 | ||
050ac52c LCC |
881 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
882 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
b2e506bf | 883 | len - baselen, false, &elems); |
050ac52c | 884 | |
dbb81c42 RP |
885 | if (elems.preq) { |
886 | if (elems.preq_len != 37) | |
050ac52c LCC |
887 | /* Right now we support just 1 destination and no AE */ |
888 | return; | |
dbb81c42 RP |
889 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
890 | MPATH_PREQ); | |
891 | if (last_hop_metric) | |
892 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
893 | last_hop_metric); | |
894 | } | |
895 | if (elems.prep) { | |
896 | if (elems.prep_len != 31) | |
050ac52c LCC |
897 | /* Right now we support no AE */ |
898 | return; | |
dbb81c42 RP |
899 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
900 | MPATH_PREP); | |
901 | if (last_hop_metric) | |
902 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
903 | last_hop_metric); | |
904 | } | |
905 | if (elems.perr) { | |
d611f062 | 906 | if (elems.perr_len != 15) |
050ac52c LCC |
907 | /* Right now we support only one destination per PERR */ |
908 | return; | |
f698d856 | 909 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 910 | } |
90a5e169 RP |
911 | if (elems.rann) |
912 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
913 | } |
914 | ||
915 | /** | |
916 | * mesh_queue_preq - queue a PREQ to a given destination | |
917 | * | |
918 | * @mpath: mesh path to discover | |
919 | * @flags: special attributes of the PREQ to be sent | |
920 | * | |
921 | * Locking: the function must be called from within a rcu read lock block. | |
922 | * | |
923 | */ | |
924 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
925 | { | |
f698d856 | 926 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 927 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
928 | struct mesh_preq_queue *preq_node; |
929 | ||
59615b5f | 930 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 931 | if (!preq_node) { |
bdcbd8e0 | 932 | mhwmp_dbg(sdata, "could not allocate PREQ node\n"); |
050ac52c LCC |
933 | return; |
934 | } | |
935 | ||
987dafad | 936 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 937 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 938 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
939 | kfree(preq_node); |
940 | if (printk_ratelimit()) | |
bdcbd8e0 | 941 | mhwmp_dbg(sdata, "PREQ node queue full\n"); |
050ac52c LCC |
942 | return; |
943 | } | |
944 | ||
f2dc7989 | 945 | spin_lock(&mpath->state_lock); |
f3011cf9 | 946 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 947 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 948 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 949 | kfree(preq_node); |
f3011cf9 JC |
950 | return; |
951 | } | |
952 | ||
050ac52c LCC |
953 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
954 | preq_node->flags = flags; | |
955 | ||
f3011cf9 | 956 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 957 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 958 | |
472dbc45 JB |
959 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
960 | ++ifmsh->preq_queue_len; | |
987dafad | 961 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 962 | |
472dbc45 | 963 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 964 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 965 | |
472dbc45 | 966 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
967 | /* avoid long wait if did not send preqs for a long time |
968 | * and jiffies wrapped around | |
969 | */ | |
472dbc45 | 970 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 971 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 972 | } else |
472dbc45 | 973 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
974 | min_preq_int_jiff(sdata)); |
975 | } | |
976 | ||
977 | /** | |
978 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
979 | * | |
f698d856 | 980 | * @sdata: local mesh subif |
050ac52c | 981 | */ |
f698d856 | 982 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 983 | { |
472dbc45 | 984 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
985 | struct mesh_preq_queue *preq_node; |
986 | struct mesh_path *mpath; | |
d19b3bf6 | 987 | u8 ttl, target_flags; |
3d045a54 | 988 | const u8 *da; |
050ac52c LCC |
989 | u32 lifetime; |
990 | ||
a43816df | 991 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
992 | if (!ifmsh->preq_queue_len || |
993 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 994 | min_preq_int_jiff(sdata))) { |
a43816df | 995 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
996 | return; |
997 | } | |
998 | ||
472dbc45 | 999 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
1000 | struct mesh_preq_queue, list); |
1001 | list_del(&preq_node->list); | |
472dbc45 | 1002 | --ifmsh->preq_queue_len; |
a43816df | 1003 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
1004 | |
1005 | rcu_read_lock(); | |
bf7cd94d | 1006 | mpath = mesh_path_lookup(sdata, preq_node->dst); |
050ac52c LCC |
1007 | if (!mpath) |
1008 | goto enddiscovery; | |
1009 | ||
1010 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 1011 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1012 | if (preq_node->flags & PREQ_Q_F_START) { |
1013 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1014 | spin_unlock_bh(&mpath->state_lock); | |
1015 | goto enddiscovery; | |
1016 | } else { | |
1017 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1018 | mpath->flags |= MESH_PATH_RESOLVING; | |
1019 | mpath->discovery_retries = 0; | |
1020 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1021 | } | |
1022 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1023 | mpath->flags & MESH_PATH_RESOLVED) { | |
1024 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1025 | spin_unlock_bh(&mpath->state_lock); | |
1026 | goto enddiscovery; | |
1027 | } | |
1028 | ||
472dbc45 | 1029 | ifmsh->last_preq = jiffies; |
050ac52c | 1030 | |
d19b3bf6 | 1031 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1032 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1033 | time_before(jiffies, ifmsh->last_sn_update)) { |
1034 | ++ifmsh->sn; | |
1035 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1036 | } |
1037 | lifetime = default_lifetime(sdata); | |
45904f21 | 1038 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1039 | if (ttl == 0) { |
472dbc45 | 1040 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1041 | spin_unlock_bh(&mpath->state_lock); |
1042 | goto enddiscovery; | |
1043 | } | |
1044 | ||
1045 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 1046 | target_flags = MP_F_DO; |
050ac52c | 1047 | else |
d19b3bf6 | 1048 | target_flags = MP_F_RF; |
050ac52c LCC |
1049 | |
1050 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1051 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
47846c9b | 1052 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 1053 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
3d045a54 | 1054 | cpu_to_le32(mpath->sn), da, 0, |
aa2b5928 | 1055 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 1056 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
1057 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1058 | ||
1059 | enddiscovery: | |
1060 | rcu_read_unlock(); | |
1061 | kfree(preq_node); | |
1062 | } | |
1063 | ||
2c53040f BH |
1064 | /** |
1065 | * mesh_nexthop_resolve - lookup next hop; conditionally start path discovery | |
050ac52c | 1066 | * |
e32f85f7 | 1067 | * @skb: 802.11 frame to be sent |
f698d856 | 1068 | * @sdata: network subif the frame will be sent through |
050ac52c | 1069 | * |
2c53040f BH |
1070 | * Lookup next hop for given skb and start path discovery if no |
1071 | * forwarding information is found. | |
1072 | * | |
0cfda851 TP |
1073 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1074 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1075 | */ |
bf7cd94d JB |
1076 | int mesh_nexthop_resolve(struct ieee80211_sub_if_data *sdata, |
1077 | struct sk_buff *skb) | |
050ac52c | 1078 | { |
e32f85f7 | 1079 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1080 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1081 | struct mesh_path *mpath; | |
1082 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1083 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1084 | int err = 0; |
1085 | ||
3f52b7e3 MP |
1086 | /* Nulls are only sent to peers for PS and should be pre-addressed */ |
1087 | if (ieee80211_is_qos_nullfunc(hdr->frame_control)) | |
1088 | return 0; | |
1089 | ||
050ac52c | 1090 | rcu_read_lock(); |
bf7cd94d | 1091 | err = mesh_nexthop_lookup(sdata, skb); |
0cfda851 TP |
1092 | if (!err) |
1093 | goto endlookup; | |
050ac52c | 1094 | |
0cfda851 | 1095 | /* no nexthop found, start resolving */ |
bf7cd94d | 1096 | mpath = mesh_path_lookup(sdata, target_addr); |
050ac52c | 1097 | if (!mpath) { |
ae76eef0 BC |
1098 | mpath = mesh_path_add(sdata, target_addr); |
1099 | if (IS_ERR(mpath)) { | |
bf7cd94d | 1100 | mesh_path_discard_frame(sdata, skb); |
ae76eef0 | 1101 | err = PTR_ERR(mpath); |
050ac52c LCC |
1102 | goto endlookup; |
1103 | } | |
1104 | } | |
1105 | ||
0cfda851 TP |
1106 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1107 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1108 | ||
1109 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1110 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1111 | ||
1112 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1113 | ieee80211_set_qos_hdr(sdata, skb); | |
1114 | skb_queue_tail(&mpath->frame_queue, skb); | |
1115 | err = -ENOENT; | |
1116 | if (skb_to_free) | |
bf7cd94d | 1117 | mesh_path_discard_frame(sdata, skb_to_free); |
0cfda851 TP |
1118 | |
1119 | endlookup: | |
1120 | rcu_read_unlock(); | |
1121 | return err; | |
1122 | } | |
bf7cd94d | 1123 | |
0cfda851 TP |
1124 | /** |
1125 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1126 | * this function is considered "using" the associated mpath, so preempt a path | |
1127 | * refresh if this mpath expires soon. | |
1128 | * | |
1129 | * @skb: 802.11 frame to be sent | |
1130 | * @sdata: network subif the frame will be sent through | |
1131 | * | |
1132 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1133 | */ | |
bf7cd94d JB |
1134 | int mesh_nexthop_lookup(struct ieee80211_sub_if_data *sdata, |
1135 | struct sk_buff *skb) | |
0cfda851 TP |
1136 | { |
1137 | struct mesh_path *mpath; | |
1138 | struct sta_info *next_hop; | |
1139 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1140 | u8 *target_addr = hdr->addr3; | |
1141 | int err = -ENOENT; | |
050ac52c | 1142 | |
0cfda851 | 1143 | rcu_read_lock(); |
bf7cd94d | 1144 | mpath = mesh_path_lookup(sdata, target_addr); |
0cfda851 TP |
1145 | |
1146 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1147 | goto endlookup; | |
1148 | ||
1149 | if (time_after(jiffies, | |
1150 | mpath->exp_time - | |
1151 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1152 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1153 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1154 | !(mpath->flags & MESH_PATH_FIXED)) | |
1155 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1156 | |
0cfda851 TP |
1157 | next_hop = rcu_dereference(mpath->next_hop); |
1158 | if (next_hop) { | |
1159 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1160 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
3f52b7e3 | 1161 | ieee80211_mps_set_frame_flags(sdata, next_hop, hdr); |
0cfda851 | 1162 | err = 0; |
050ac52c LCC |
1163 | } |
1164 | ||
1165 | endlookup: | |
1166 | rcu_read_unlock(); | |
1167 | return err; | |
1168 | } | |
1169 | ||
1170 | void mesh_path_timer(unsigned long data) | |
1171 | { | |
dea4096b JB |
1172 | struct mesh_path *mpath = (void *) data; |
1173 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1174 | int ret; |
5bb644a0 | 1175 | |
dea4096b | 1176 | if (sdata->local->quiescing) |
5bb644a0 | 1177 | return; |
5bb644a0 JB |
1178 | |
1179 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1180 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1181 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1182 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1183 | spin_unlock_bh(&mpath->state_lock); |
1184 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1185 | ++mpath->discovery_retries; |
1186 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1187 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1188 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1189 | mesh_queue_preq(mpath, 0); |
1190 | } else { | |
1191 | mpath->flags = 0; | |
1192 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1193 | spin_unlock_bh(&mpath->state_lock); |
1194 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1195 | ret = mesh_path_send_to_gates(mpath); | |
1196 | if (ret) | |
bdcbd8e0 | 1197 | mhwmp_dbg(sdata, "no gate was reachable\n"); |
5ee68e5b JC |
1198 | } else |
1199 | mesh_path_flush_pending(mpath); | |
050ac52c | 1200 | } |
050ac52c | 1201 | } |
e304bfd3 | 1202 | |
bf7cd94d | 1203 | void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) |
e304bfd3 RP |
1204 | { |
1205 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1206 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1207 | u8 flags, target_flags = 0; |
e304bfd3 | 1208 | |
16dd7267 JC |
1209 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1210 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1211 | |
1212 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1213 | case IEEE80211_PROACTIVE_RANN: | |
1214 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1215 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1216 | 0, NULL, 0, broadcast_addr, |
a69cc44f | 1217 | 0, ifmsh->mshcfg.element_ttl, |
0507e159 | 1218 | cpu_to_le32(interval), 0, 0, sdata); |
a69cc44f CYY |
1219 | break; |
1220 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1221 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1222 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1223 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1224 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1225 | IEEE80211_PREQ_USN_FLAG; | |
1226 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
1227 | cpu_to_le32(++ifmsh->sn), target_flags, | |
1228 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1229 | 0, ifmsh->mshcfg.element_ttl, | |
1230 | cpu_to_le32(interval), | |
1231 | 0, cpu_to_le32(ifmsh->preq_id++), sdata); | |
1232 | break; | |
1233 | default: | |
bdcbd8e0 | 1234 | mhwmp_dbg(sdata, "Proactive mechanism not supported\n"); |
a69cc44f CYY |
1235 | return; |
1236 | } | |
e304bfd3 | 1237 | } |