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 | ||
27db2e42 | 16 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
7646887a JC |
17 | #define mhwmp_dbg(fmt, args...) \ |
18 | printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args) | |
27db2e42 RP |
19 | #else |
20 | #define mhwmp_dbg(fmt, args...) do { (void)(0); } while (0) | |
21 | #endif | |
22 | ||
050ac52c LCC |
23 | #define TEST_FRAME_LEN 8192 |
24 | #define MAX_METRIC 0xffffffff | |
25 | #define ARITH_SHIFT 8 | |
26 | ||
27 | /* Number of frames buffered per destination for unresolved destinations */ | |
28 | #define MESH_FRAME_QUEUE_LEN 10 | |
29 | #define MAX_PREQ_QUEUE_LEN 64 | |
30 | ||
31 | /* Destination only */ | |
32 | #define MP_F_DO 0x1 | |
33 | /* Reply and forward */ | |
34 | #define MP_F_RF 0x2 | |
d611f062 RP |
35 | /* Unknown Sequence Number */ |
36 | #define MP_F_USN 0x01 | |
37 | /* Reason code Present */ | |
38 | #define MP_F_RCODE 0x02 | |
050ac52c | 39 | |
90a5e169 RP |
40 | static void mesh_queue_preq(struct mesh_path *, u8); |
41 | ||
a00de5d0 LCC |
42 | static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae) |
43 | { | |
44 | if (ae) | |
45 | offset += 6; | |
ae7245cb | 46 | return get_unaligned_le32(preq_elem + offset); |
a00de5d0 LCC |
47 | } |
48 | ||
d611f062 RP |
49 | static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae) |
50 | { | |
51 | if (ae) | |
52 | offset += 6; | |
53 | return get_unaligned_le16(preq_elem + offset); | |
54 | } | |
55 | ||
050ac52c | 56 | /* HWMP IE processing macros */ |
a00de5d0 LCC |
57 | #define AE_F (1<<6) |
58 | #define AE_F_SET(x) (*x & AE_F) | |
59 | #define PREQ_IE_FLAGS(x) (*(x)) | |
60 | #define PREQ_IE_HOPCOUNT(x) (*(x + 1)) | |
61 | #define PREQ_IE_TTL(x) (*(x + 2)) | |
62 | #define PREQ_IE_PREQ_ID(x) u32_field_get(x, 3, 0) | |
63 | #define PREQ_IE_ORIG_ADDR(x) (x + 7) | |
497888cf PC |
64 | #define PREQ_IE_ORIG_SN(x) u32_field_get(x, 13, 0) |
65 | #define PREQ_IE_LIFETIME(x) u32_field_get(x, 17, AE_F_SET(x)) | |
66 | #define PREQ_IE_METRIC(x) u32_field_get(x, 21, AE_F_SET(x)) | |
d19b3bf6 RP |
67 | #define PREQ_IE_TARGET_F(x) (*(AE_F_SET(x) ? x + 32 : x + 26)) |
68 | #define PREQ_IE_TARGET_ADDR(x) (AE_F_SET(x) ? x + 33 : x + 27) | |
497888cf | 69 | #define PREQ_IE_TARGET_SN(x) u32_field_get(x, 33, AE_F_SET(x)) |
a00de5d0 LCC |
70 | |
71 | ||
72 | #define PREP_IE_FLAGS(x) PREQ_IE_FLAGS(x) | |
73 | #define PREP_IE_HOPCOUNT(x) PREQ_IE_HOPCOUNT(x) | |
74 | #define PREP_IE_TTL(x) PREQ_IE_TTL(x) | |
25d49e4d TP |
75 | #define PREP_IE_ORIG_ADDR(x) (AE_F_SET(x) ? x + 27 : x + 21) |
76 | #define PREP_IE_ORIG_SN(x) u32_field_get(x, 27, AE_F_SET(x)) | |
497888cf PC |
77 | #define PREP_IE_LIFETIME(x) u32_field_get(x, 13, AE_F_SET(x)) |
78 | #define PREP_IE_METRIC(x) u32_field_get(x, 17, AE_F_SET(x)) | |
25d49e4d TP |
79 | #define PREP_IE_TARGET_ADDR(x) (x + 3) |
80 | #define PREP_IE_TARGET_SN(x) u32_field_get(x, 9, 0) | |
a00de5d0 | 81 | |
d611f062 | 82 | #define PERR_IE_TTL(x) (*(x)) |
d19b3bf6 RP |
83 | #define PERR_IE_TARGET_FLAGS(x) (*(x + 2)) |
84 | #define PERR_IE_TARGET_ADDR(x) (x + 3) | |
497888cf PC |
85 | #define PERR_IE_TARGET_SN(x) u32_field_get(x, 9, 0) |
86 | #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0) | |
050ac52c | 87 | |
050ac52c | 88 | #define MSEC_TO_TU(x) (x*1000/1024) |
d19b3bf6 RP |
89 | #define SN_GT(x, y) ((long) (y) - (long) (x) < 0) |
90 | #define SN_LT(x, y) ((long) (x) - (long) (y) < 0) | |
050ac52c LCC |
91 | |
92 | #define net_traversal_jiffies(s) \ | |
472dbc45 | 93 | msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime) |
050ac52c | 94 | #define default_lifetime(s) \ |
472dbc45 | 95 | MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout) |
050ac52c | 96 | #define min_preq_int_jiff(s) \ |
472dbc45 JB |
97 | (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval)) |
98 | #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries) | |
050ac52c | 99 | #define disc_timeout_jiff(s) \ |
472dbc45 | 100 | msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout) |
050ac52c LCC |
101 | |
102 | enum mpath_frame_type { | |
103 | MPATH_PREQ = 0, | |
104 | MPATH_PREP, | |
90a5e169 RP |
105 | MPATH_PERR, |
106 | MPATH_RANN | |
050ac52c LCC |
107 | }; |
108 | ||
15ff6365 JB |
109 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
110 | ||
050ac52c | 111 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 112 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
113 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
114 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 115 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 116 | { |
f698d856 | 117 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 118 | struct sk_buff *skb; |
050ac52c | 119 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
120 | u8 *pos, ie_len; |
121 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
122 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 123 | |
65e8b0cc | 124 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
125 | hdr_len + |
126 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
127 | if (!skb) |
128 | return -1; | |
65e8b0cc | 129 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
130 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
131 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
132 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
133 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
134 | |
135 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 136 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 137 | /* BSSID == SA */ |
47846c9b | 138 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
139 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
140 | mgmt->u.action.u.mesh_action.action_code = | |
141 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
142 | |
143 | switch (action) { | |
144 | case MPATH_PREQ: | |
7646887a | 145 | mhwmp_dbg("sending PREQ to %pM", target); |
050ac52c LCC |
146 | ie_len = 37; |
147 | pos = skb_put(skb, 2 + ie_len); | |
148 | *pos++ = WLAN_EID_PREQ; | |
149 | break; | |
150 | case MPATH_PREP: | |
7646887a | 151 | mhwmp_dbg("sending PREP to %pM", target); |
050ac52c LCC |
152 | ie_len = 31; |
153 | pos = skb_put(skb, 2 + ie_len); | |
154 | *pos++ = WLAN_EID_PREP; | |
155 | break; | |
90a5e169 | 156 | case MPATH_RANN: |
7646887a | 157 | mhwmp_dbg("sending RANN from %pM", orig_addr); |
90a5e169 RP |
158 | ie_len = sizeof(struct ieee80211_rann_ie); |
159 | pos = skb_put(skb, 2 + ie_len); | |
160 | *pos++ = WLAN_EID_RANN; | |
161 | break; | |
050ac52c | 162 | default: |
812714d7 | 163 | kfree_skb(skb); |
050ac52c LCC |
164 | return -ENOTSUPP; |
165 | break; | |
166 | } | |
167 | *pos++ = ie_len; | |
168 | *pos++ = flags; | |
169 | *pos++ = hop_count; | |
170 | *pos++ = ttl; | |
25d49e4d TP |
171 | if (action == MPATH_PREP) { |
172 | memcpy(pos, target, ETH_ALEN); | |
173 | pos += ETH_ALEN; | |
174 | memcpy(pos, &target_sn, 4); | |
050ac52c | 175 | pos += 4; |
25d49e4d TP |
176 | } else { |
177 | if (action == MPATH_PREQ) { | |
178 | memcpy(pos, &preq_id, 4); | |
179 | pos += 4; | |
180 | } | |
181 | memcpy(pos, orig_addr, ETH_ALEN); | |
182 | pos += ETH_ALEN; | |
183 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
184 | pos += 4; |
185 | } | |
25d49e4d TP |
186 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
187 | pos += 4; | |
050ac52c LCC |
188 | memcpy(pos, &metric, 4); |
189 | pos += 4; | |
190 | if (action == MPATH_PREQ) { | |
25d49e4d | 191 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 192 | *pos++ = target_flags; |
d19b3bf6 | 193 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 194 | pos += ETH_ALEN; |
d19b3bf6 | 195 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
196 | pos += 4; |
197 | } else if (action == MPATH_PREP) { | |
198 | memcpy(pos, orig_addr, ETH_ALEN); | |
199 | pos += ETH_ALEN; | |
200 | memcpy(pos, &orig_sn, 4); | |
201 | pos += 4; | |
90a5e169 | 202 | } |
050ac52c | 203 | |
62ae67be | 204 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
205 | return 0; |
206 | } | |
207 | ||
2cca397f JC |
208 | |
209 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
210 | * headroom in case the frame is encrypted. */ | |
211 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
212 | struct sk_buff *skb) | |
213 | { | |
2cca397f JC |
214 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
215 | ||
216 | skb_set_mac_header(skb, 0); | |
217 | skb_set_network_header(skb, 0); | |
218 | skb_set_transport_header(skb, 0); | |
219 | ||
220 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
221 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
222 | skb->priority = 7; | |
223 | ||
224 | info->control.vif = &sdata->vif; | |
2154c81c | 225 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
226 | } |
227 | ||
050ac52c LCC |
228 | /** |
229 | * mesh_send_path error - Sends a PERR mesh management frame | |
230 | * | |
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 |
2cca397f JC |
235 | * |
236 | * Note: This function may be called with driver locks taken that the driver | |
237 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
238 | * frame directly but add it to the pending queue instead. | |
050ac52c | 239 | */ |
d19b3bf6 | 240 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
241 | __le16 target_rcode, const u8 *ra, |
242 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 243 | { |
f698d856 | 244 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 245 | struct sk_buff *skb; |
dca7e943 | 246 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 247 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
248 | u8 *pos, ie_len; |
249 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
250 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 251 | |
dca7e943 TP |
252 | if (time_before(jiffies, ifmsh->next_perr)) |
253 | return -EAGAIN; | |
254 | ||
65e8b0cc | 255 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
256 | hdr_len + |
257 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
258 | if (!skb) |
259 | return -1; | |
65e8b0cc | 260 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
261 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
262 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
263 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
264 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
265 | |
266 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 267 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
268 | /* BSSID == SA */ |
269 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
270 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
271 | mgmt->u.action.u.mesh_action.action_code = | |
272 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 273 | ie_len = 15; |
050ac52c LCC |
274 | pos = skb_put(skb, 2 + ie_len); |
275 | *pos++ = WLAN_EID_PERR; | |
276 | *pos++ = ie_len; | |
d611f062 | 277 | /* ttl */ |
45904f21 | 278 | *pos++ = ttl; |
050ac52c LCC |
279 | /* number of destinations */ |
280 | *pos++ = 1; | |
d611f062 RP |
281 | /* |
282 | * flags bit, bit 1 is unset if we know the sequence number and | |
283 | * bit 2 is set if we have a reason code | |
284 | */ | |
285 | *pos = 0; | |
d19b3bf6 | 286 | if (!target_sn) |
d611f062 | 287 | *pos |= MP_F_USN; |
d19b3bf6 | 288 | if (target_rcode) |
d611f062 RP |
289 | *pos |= MP_F_RCODE; |
290 | pos++; | |
d19b3bf6 | 291 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 292 | pos += ETH_ALEN; |
d19b3bf6 | 293 | memcpy(pos, &target_sn, 4); |
d611f062 | 294 | pos += 4; |
d19b3bf6 | 295 | memcpy(pos, &target_rcode, 2); |
050ac52c | 296 | |
2cca397f JC |
297 | /* see note in function header */ |
298 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
299 | ifmsh->next_perr = TU_TO_EXP_TIME( |
300 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 301 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
302 | return 0; |
303 | } | |
304 | ||
bfc32e6a JC |
305 | void ieee80211s_update_metric(struct ieee80211_local *local, |
306 | struct sta_info *stainfo, struct sk_buff *skb) | |
307 | { | |
308 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
309 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
310 | int failed; | |
311 | ||
312 | if (!ieee80211_is_data(hdr->frame_control)) | |
313 | return; | |
314 | ||
315 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
316 | ||
317 | /* moving average, scaled to 100 */ | |
318 | stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed); | |
319 | if (stainfo->fail_avg > 95) | |
320 | mesh_plink_broken(stainfo); | |
321 | } | |
322 | ||
050ac52c LCC |
323 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
324 | struct sta_info *sta) | |
325 | { | |
326 | struct ieee80211_supported_band *sband; | |
6b62bf32 | 327 | struct rate_info rinfo; |
050ac52c LCC |
328 | /* This should be adjusted for each device */ |
329 | int device_constant = 1 << ARITH_SHIFT; | |
330 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
331 | int s_unit = 1 << ARITH_SHIFT; | |
332 | int rate, err; | |
333 | u32 tx_time, estimated_retx; | |
334 | u64 result; | |
335 | ||
336 | sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; | |
337 | ||
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) | |
363 | * | |
364 | * This function updates the path routing information to the originator and the | |
f99288d1 | 365 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
366 | * |
367 | * Returns: metric to frame originator or 0 if the frame should not be further | |
368 | * processed | |
369 | * | |
370 | * Notes: this function is the only place (besides user-provided info) where | |
371 | * path routing information is updated. | |
372 | */ | |
f698d856 | 373 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 374 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 375 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 376 | { |
f698d856 | 377 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
378 | struct mesh_path *mpath; |
379 | struct sta_info *sta; | |
380 | bool fresh_info; | |
381 | u8 *orig_addr, *ta; | |
d19b3bf6 | 382 | u32 orig_sn, orig_metric; |
050ac52c LCC |
383 | unsigned long orig_lifetime, exp_time; |
384 | u32 last_hop_metric, new_metric; | |
385 | bool process = true; | |
050ac52c LCC |
386 | |
387 | rcu_read_lock(); | |
abe60632 | 388 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
389 | if (!sta) { |
390 | rcu_read_unlock(); | |
050ac52c | 391 | return 0; |
dc0b0f7d | 392 | } |
050ac52c LCC |
393 | |
394 | last_hop_metric = airtime_link_metric_get(local, sta); | |
395 | /* Update and check originator routing info */ | |
396 | fresh_info = true; | |
397 | ||
398 | switch (action) { | |
399 | case MPATH_PREQ: | |
400 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 401 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
402 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
403 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
404 | break; | |
405 | case MPATH_PREP: | |
3c26f1f6 TP |
406 | /* Originator here refers to the MP that was the target in the |
407 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
408 | * so that we can easily use a single function to gather path |
409 | * information from both PREQ and PREP frames. | |
410 | */ | |
3c26f1f6 TP |
411 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
412 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
413 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
414 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
415 | break; | |
416 | default: | |
dc0b0f7d | 417 | rcu_read_unlock(); |
050ac52c LCC |
418 | return 0; |
419 | } | |
420 | new_metric = orig_metric + last_hop_metric; | |
421 | if (new_metric < orig_metric) | |
422 | new_metric = MAX_METRIC; | |
423 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
424 | ||
888d04df | 425 | if (compare_ether_addr(orig_addr, sdata->vif.addr) == 0) { |
050ac52c LCC |
426 | /* This MP is the originator, we are not interested in this |
427 | * frame, except for updating transmitter's path info. | |
428 | */ | |
429 | process = false; | |
430 | fresh_info = false; | |
431 | } else { | |
f698d856 | 432 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
433 | if (mpath) { |
434 | spin_lock_bh(&mpath->state_lock); | |
435 | if (mpath->flags & MESH_PATH_FIXED) | |
436 | fresh_info = false; | |
437 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
438 | (mpath->flags & MESH_PATH_SN_VALID)) { |
439 | if (SN_GT(mpath->sn, orig_sn) || | |
440 | (mpath->sn == orig_sn && | |
533866b1 | 441 | new_metric >= mpath->metric)) { |
050ac52c LCC |
442 | process = false; |
443 | fresh_info = false; | |
444 | } | |
445 | } | |
446 | } else { | |
f698d856 JBG |
447 | mesh_path_add(orig_addr, sdata); |
448 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
449 | if (!mpath) { |
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; | |
888d04df | 475 | if (compare_ether_addr(orig_addr, ta) == 0) |
050ac52c LCC |
476 | fresh_info = false; |
477 | else { | |
478 | fresh_info = true; | |
479 | ||
f698d856 | 480 | mpath = mesh_path_lookup(ta, sdata); |
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 { | |
f698d856 JBG |
488 | mesh_path_add(ta, sdata); |
489 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
490 | if (!mpath) { |
491 | rcu_read_unlock(); | |
050ac52c LCC |
492 | return 0; |
493 | } | |
494 | spin_lock_bh(&mpath->state_lock); | |
495 | } | |
496 | ||
497 | if (fresh_info) { | |
498 | mesh_path_assign_nexthop(mpath, sta); | |
050ac52c LCC |
499 | mpath->metric = last_hop_metric; |
500 | mpath->exp_time = time_after(mpath->exp_time, exp_time) | |
501 | ? mpath->exp_time : exp_time; | |
502 | mesh_path_activate(mpath); | |
503 | spin_unlock_bh(&mpath->state_lock); | |
504 | mesh_path_tx_pending(mpath); | |
505 | } else | |
506 | spin_unlock_bh(&mpath->state_lock); | |
507 | } | |
508 | ||
050ac52c LCC |
509 | rcu_read_unlock(); |
510 | ||
511 | return process ? new_metric : 0; | |
512 | } | |
513 | ||
f698d856 | 514 | static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c | 515 | struct ieee80211_mgmt *mgmt, |
57ef5ddb DW |
516 | u8 *preq_elem, u32 metric) |
517 | { | |
472dbc45 | 518 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 519 | struct mesh_path *mpath = NULL; |
d19b3bf6 | 520 | u8 *target_addr, *orig_addr; |
3d045a54 | 521 | const u8 *da; |
d19b3bf6 RP |
522 | u8 target_flags, ttl; |
523 | u32 orig_sn, target_sn, lifetime; | |
050ac52c LCC |
524 | bool reply = false; |
525 | bool forward = true; | |
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); | |
050ac52c | 533 | |
7646887a | 534 | mhwmp_dbg("received PREQ from %pM", orig_addr); |
27db2e42 | 535 | |
888d04df | 536 | if (compare_ether_addr(target_addr, sdata->vif.addr) == 0) { |
7646887a | 537 | mhwmp_dbg("PREQ is for us"); |
050ac52c LCC |
538 | forward = false; |
539 | reply = true; | |
540 | metric = 0; | |
d19b3bf6 | 541 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 542 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
543 | time_before(jiffies, ifmsh->last_sn_update)) { |
544 | target_sn = ++ifmsh->sn; | |
545 | ifmsh->last_sn_update = jiffies; | |
050ac52c LCC |
546 | } |
547 | } else { | |
548 | rcu_read_lock(); | |
d19b3bf6 | 549 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 550 | if (mpath) { |
d19b3bf6 RP |
551 | if ((!(mpath->flags & MESH_PATH_SN_VALID)) || |
552 | SN_LT(mpath->sn, target_sn)) { | |
553 | mpath->sn = target_sn; | |
554 | mpath->flags |= MESH_PATH_SN_VALID; | |
555 | } else if ((!(target_flags & MP_F_DO)) && | |
050ac52c LCC |
556 | (mpath->flags & MESH_PATH_ACTIVE)) { |
557 | reply = true; | |
558 | metric = mpath->metric; | |
d19b3bf6 RP |
559 | target_sn = mpath->sn; |
560 | if (target_flags & MP_F_RF) | |
561 | target_flags |= MP_F_DO; | |
050ac52c LCC |
562 | else |
563 | forward = false; | |
564 | } | |
565 | } | |
566 | rcu_read_unlock(); | |
567 | } | |
568 | ||
569 | if (reply) { | |
570 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
45904f21 | 571 | ttl = ifmsh->mshcfg.element_ttl; |
27db2e42 | 572 | if (ttl != 0) { |
7646887a | 573 | mhwmp_dbg("replying to the PREQ"); |
3c26f1f6 TP |
574 | mesh_path_sel_frame_tx(MPATH_PREP, 0, orig_addr, |
575 | cpu_to_le32(orig_sn), 0, target_addr, | |
576 | cpu_to_le32(target_sn), mgmt->sa, 0, ttl, | |
aa2b5928 | 577 | cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 578 | 0, sdata); |
27db2e42 | 579 | } else |
472dbc45 | 580 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
581 | } |
582 | ||
94f90656 | 583 | if (forward && ifmsh->mshcfg.dot11MeshForwarding) { |
050ac52c LCC |
584 | u32 preq_id; |
585 | u8 hopcount, flags; | |
586 | ||
587 | ttl = PREQ_IE_TTL(preq_elem); | |
588 | lifetime = PREQ_IE_LIFETIME(preq_elem); | |
589 | if (ttl <= 1) { | |
472dbc45 | 590 | ifmsh->mshstats.dropped_frames_ttl++; |
050ac52c LCC |
591 | return; |
592 | } | |
7646887a | 593 | mhwmp_dbg("forwarding the PREQ from %pM", orig_addr); |
050ac52c LCC |
594 | --ttl; |
595 | flags = PREQ_IE_FLAGS(preq_elem); | |
596 | preq_id = PREQ_IE_PREQ_ID(preq_elem); | |
597 | hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1; | |
3d045a54 CYY |
598 | da = (mpath && mpath->is_root) ? |
599 | mpath->rann_snd_addr : broadcast_addr; | |
050ac52c | 600 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr, |
d19b3bf6 | 601 | cpu_to_le32(orig_sn), target_flags, target_addr, |
3d045a54 | 602 | cpu_to_le32(target_sn), da, |
aa2b5928 LCC |
603 | hopcount, ttl, cpu_to_le32(lifetime), |
604 | cpu_to_le32(metric), cpu_to_le32(preq_id), | |
f698d856 | 605 | sdata); |
c8a61a7d | 606 | ifmsh->mshstats.fwded_mcast++; |
472dbc45 | 607 | ifmsh->mshstats.fwded_frames++; |
050ac52c LCC |
608 | } |
609 | } | |
610 | ||
611 | ||
40b275b6 JB |
612 | static inline struct sta_info * |
613 | next_hop_deref_protected(struct mesh_path *mpath) | |
614 | { | |
615 | return rcu_dereference_protected(mpath->next_hop, | |
616 | lockdep_is_held(&mpath->state_lock)); | |
617 | } | |
618 | ||
619 | ||
f698d856 | 620 | static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
621 | struct ieee80211_mgmt *mgmt, |
622 | u8 *prep_elem, u32 metric) | |
623 | { | |
d665508b | 624 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 625 | struct mesh_path *mpath; |
d19b3bf6 | 626 | u8 *target_addr, *orig_addr; |
050ac52c LCC |
627 | u8 ttl, hopcount, flags; |
628 | u8 next_hop[ETH_ALEN]; | |
d19b3bf6 | 629 | u32 target_sn, orig_sn, lifetime; |
050ac52c | 630 | |
7646887a | 631 | mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 632 | |
3c26f1f6 | 633 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
888d04df | 634 | if (compare_ether_addr(orig_addr, sdata->vif.addr) == 0) |
050ac52c LCC |
635 | /* destination, no forwarding required */ |
636 | return; | |
637 | ||
d665508b CYY |
638 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
639 | return; | |
640 | ||
050ac52c LCC |
641 | ttl = PREP_IE_TTL(prep_elem); |
642 | if (ttl <= 1) { | |
472dbc45 | 643 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
644 | return; |
645 | } | |
646 | ||
647 | rcu_read_lock(); | |
3c26f1f6 | 648 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
649 | if (mpath) |
650 | spin_lock_bh(&mpath->state_lock); | |
651 | else | |
652 | goto fail; | |
653 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
654 | spin_unlock_bh(&mpath->state_lock); | |
655 | goto fail; | |
656 | } | |
40b275b6 | 657 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
658 | spin_unlock_bh(&mpath->state_lock); |
659 | --ttl; | |
660 | flags = PREP_IE_FLAGS(prep_elem); | |
661 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
662 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 663 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
664 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
665 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
666 | |
667 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 668 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 669 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 670 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 671 | 0, sdata); |
050ac52c | 672 | rcu_read_unlock(); |
c8a61a7d DW |
673 | |
674 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 675 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
676 | return; |
677 | ||
678 | fail: | |
679 | rcu_read_unlock(); | |
472dbc45 | 680 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
681 | } |
682 | ||
f698d856 | 683 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
684 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
685 | { | |
d611f062 | 686 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 687 | struct mesh_path *mpath; |
d611f062 | 688 | u8 ttl; |
d19b3bf6 | 689 | u8 *ta, *target_addr; |
d19b3bf6 RP |
690 | u32 target_sn; |
691 | u16 target_rcode; | |
050ac52c LCC |
692 | |
693 | ta = mgmt->sa; | |
d611f062 RP |
694 | ttl = PERR_IE_TTL(perr_elem); |
695 | if (ttl <= 1) { | |
696 | ifmsh->mshstats.dropped_frames_ttl++; | |
697 | return; | |
698 | } | |
699 | ttl--; | |
d19b3bf6 RP |
700 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
701 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
702 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 703 | |
050ac52c | 704 | rcu_read_lock(); |
d19b3bf6 | 705 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 706 | if (mpath) { |
888d04df FF |
707 | struct sta_info *sta; |
708 | ||
050ac52c | 709 | spin_lock_bh(&mpath->state_lock); |
888d04df | 710 | sta = next_hop_deref_protected(mpath); |
050ac52c | 711 | if (mpath->flags & MESH_PATH_ACTIVE && |
888d04df | 712 | compare_ether_addr(ta, sta->sta.addr) == 0 && |
d19b3bf6 RP |
713 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
714 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 715 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 716 | mpath->sn = target_sn; |
050ac52c | 717 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
718 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
719 | goto endperr; | |
d19b3bf6 RP |
720 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
721 | cpu_to_le16(target_rcode), | |
15ff6365 | 722 | broadcast_addr, sdata); |
050ac52c LCC |
723 | } else |
724 | spin_unlock_bh(&mpath->state_lock); | |
725 | } | |
d665508b | 726 | endperr: |
050ac52c LCC |
727 | rcu_read_unlock(); |
728 | } | |
729 | ||
90a5e169 RP |
730 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
731 | struct ieee80211_mgmt *mgmt, | |
732 | struct ieee80211_rann_ie *rann) | |
733 | { | |
734 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
735 | struct mesh_path *mpath; | |
90a5e169 RP |
736 | u8 ttl, flags, hopcount; |
737 | u8 *orig_addr; | |
d19b3bf6 | 738 | u32 orig_sn, metric; |
0507e159 | 739 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
5ee68e5b | 740 | bool root_is_gate; |
90a5e169 | 741 | |
90a5e169 RP |
742 | ttl = rann->rann_ttl; |
743 | if (ttl <= 1) { | |
744 | ifmsh->mshstats.dropped_frames_ttl++; | |
745 | return; | |
746 | } | |
747 | ttl--; | |
748 | flags = rann->rann_flags; | |
5ee68e5b | 749 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 750 | orig_addr = rann->rann_addr; |
d19b3bf6 | 751 | orig_sn = rann->rann_seq; |
90a5e169 | 752 | hopcount = rann->rann_hopcount; |
a6a58b4f | 753 | hopcount++; |
90a5e169 | 754 | metric = rann->rann_metric; |
5ee68e5b JC |
755 | |
756 | /* Ignore our own RANNs */ | |
888d04df | 757 | if (compare_ether_addr(orig_addr, sdata->vif.addr) == 0) |
5ee68e5b JC |
758 | return; |
759 | ||
3d045a54 CYY |
760 | mhwmp_dbg("received RANN from %pM via neighbour %pM (is_gate=%d)", |
761 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
762 | |
763 | rcu_read_lock(); | |
764 | mpath = mesh_path_lookup(orig_addr, sdata); | |
765 | if (!mpath) { | |
766 | mesh_path_add(orig_addr, sdata); | |
767 | mpath = mesh_path_lookup(orig_addr, sdata); | |
768 | if (!mpath) { | |
769 | rcu_read_unlock(); | |
770 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
771 | return; | |
772 | } | |
90a5e169 | 773 | } |
5ee68e5b JC |
774 | |
775 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || | |
776 | time_after(jiffies, mpath->exp_time - 1*HZ)) && | |
777 | !(mpath->flags & MESH_PATH_FIXED)) { | |
778 | mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name, | |
779 | orig_addr); | |
780 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
781 | } | |
782 | ||
d665508b | 783 | if (mpath->sn < orig_sn && ifmsh->mshcfg.dot11MeshForwarding) { |
90a5e169 | 784 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 785 | cpu_to_le32(orig_sn), |
15ff6365 | 786 | 0, NULL, 0, broadcast_addr, |
0507e159 | 787 | hopcount, ttl, cpu_to_le32(interval), |
a6a58b4f | 788 | cpu_to_le32(metric + mpath->metric), |
90a5e169 | 789 | 0, sdata); |
d19b3bf6 | 790 | mpath->sn = orig_sn; |
90a5e169 | 791 | } |
3d045a54 CYY |
792 | |
793 | /* Using individually addressed PREQ for root node */ | |
794 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
795 | mpath->is_root = true; | |
796 | ||
5ee68e5b JC |
797 | if (root_is_gate) |
798 | mesh_path_add_gate(mpath); | |
799 | ||
90a5e169 RP |
800 | rcu_read_unlock(); |
801 | } | |
050ac52c LCC |
802 | |
803 | ||
f698d856 | 804 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
805 | struct ieee80211_mgmt *mgmt, |
806 | size_t len) | |
807 | { | |
808 | struct ieee802_11_elems elems; | |
809 | size_t baselen; | |
810 | u32 last_hop_metric; | |
97091317 | 811 | struct sta_info *sta; |
050ac52c | 812 | |
9c80d3dc JB |
813 | /* need action_code */ |
814 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
815 | return; | |
816 | ||
97091317 JC |
817 | rcu_read_lock(); |
818 | sta = sta_info_get(sdata, mgmt->sa); | |
819 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
820 | rcu_read_unlock(); | |
821 | return; | |
822 | } | |
823 | rcu_read_unlock(); | |
824 | ||
050ac52c LCC |
825 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
826 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
827 | len - baselen, &elems); | |
828 | ||
dbb81c42 RP |
829 | if (elems.preq) { |
830 | if (elems.preq_len != 37) | |
050ac52c LCC |
831 | /* Right now we support just 1 destination and no AE */ |
832 | return; | |
dbb81c42 RP |
833 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
834 | MPATH_PREQ); | |
835 | if (last_hop_metric) | |
836 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
837 | last_hop_metric); | |
838 | } | |
839 | if (elems.prep) { | |
840 | if (elems.prep_len != 31) | |
050ac52c LCC |
841 | /* Right now we support no AE */ |
842 | return; | |
dbb81c42 RP |
843 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
844 | MPATH_PREP); | |
845 | if (last_hop_metric) | |
846 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
847 | last_hop_metric); | |
848 | } | |
849 | if (elems.perr) { | |
d611f062 | 850 | if (elems.perr_len != 15) |
050ac52c LCC |
851 | /* Right now we support only one destination per PERR */ |
852 | return; | |
f698d856 | 853 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 854 | } |
90a5e169 RP |
855 | if (elems.rann) |
856 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
857 | } |
858 | ||
859 | /** | |
860 | * mesh_queue_preq - queue a PREQ to a given destination | |
861 | * | |
862 | * @mpath: mesh path to discover | |
863 | * @flags: special attributes of the PREQ to be sent | |
864 | * | |
865 | * Locking: the function must be called from within a rcu read lock block. | |
866 | * | |
867 | */ | |
868 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
869 | { | |
f698d856 | 870 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 871 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
872 | struct mesh_preq_queue *preq_node; |
873 | ||
59615b5f | 874 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 875 | if (!preq_node) { |
7646887a | 876 | mhwmp_dbg("could not allocate PREQ node"); |
050ac52c LCC |
877 | return; |
878 | } | |
879 | ||
987dafad | 880 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 881 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 882 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
883 | kfree(preq_node); |
884 | if (printk_ratelimit()) | |
7646887a | 885 | mhwmp_dbg("PREQ node queue full"); |
050ac52c LCC |
886 | return; |
887 | } | |
888 | ||
f2dc7989 | 889 | spin_lock(&mpath->state_lock); |
f3011cf9 | 890 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 891 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 892 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 893 | kfree(preq_node); |
f3011cf9 JC |
894 | return; |
895 | } | |
896 | ||
050ac52c LCC |
897 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
898 | preq_node->flags = flags; | |
899 | ||
f3011cf9 | 900 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 901 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 902 | |
472dbc45 JB |
903 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
904 | ++ifmsh->preq_queue_len; | |
987dafad | 905 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 906 | |
472dbc45 | 907 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 908 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 909 | |
472dbc45 | 910 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
911 | /* avoid long wait if did not send preqs for a long time |
912 | * and jiffies wrapped around | |
913 | */ | |
472dbc45 | 914 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 915 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 916 | } else |
472dbc45 | 917 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
918 | min_preq_int_jiff(sdata)); |
919 | } | |
920 | ||
921 | /** | |
922 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
923 | * | |
f698d856 | 924 | * @sdata: local mesh subif |
050ac52c | 925 | */ |
f698d856 | 926 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 927 | { |
472dbc45 | 928 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
929 | struct mesh_preq_queue *preq_node; |
930 | struct mesh_path *mpath; | |
d19b3bf6 | 931 | u8 ttl, target_flags; |
3d045a54 | 932 | const u8 *da; |
050ac52c LCC |
933 | u32 lifetime; |
934 | ||
a43816df | 935 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
936 | if (!ifmsh->preq_queue_len || |
937 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 938 | min_preq_int_jiff(sdata))) { |
a43816df | 939 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
940 | return; |
941 | } | |
942 | ||
472dbc45 | 943 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
944 | struct mesh_preq_queue, list); |
945 | list_del(&preq_node->list); | |
472dbc45 | 946 | --ifmsh->preq_queue_len; |
a43816df | 947 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
948 | |
949 | rcu_read_lock(); | |
f698d856 | 950 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
951 | if (!mpath) |
952 | goto enddiscovery; | |
953 | ||
954 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 955 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
956 | if (preq_node->flags & PREQ_Q_F_START) { |
957 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
958 | spin_unlock_bh(&mpath->state_lock); | |
959 | goto enddiscovery; | |
960 | } else { | |
961 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
962 | mpath->flags |= MESH_PATH_RESOLVING; | |
963 | mpath->discovery_retries = 0; | |
964 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
965 | } | |
966 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
967 | mpath->flags & MESH_PATH_RESOLVED) { | |
968 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
969 | spin_unlock_bh(&mpath->state_lock); | |
970 | goto enddiscovery; | |
971 | } | |
972 | ||
472dbc45 | 973 | ifmsh->last_preq = jiffies; |
050ac52c | 974 | |
d19b3bf6 | 975 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 976 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
977 | time_before(jiffies, ifmsh->last_sn_update)) { |
978 | ++ifmsh->sn; | |
979 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
980 | } |
981 | lifetime = default_lifetime(sdata); | |
45904f21 | 982 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 983 | if (ttl == 0) { |
472dbc45 | 984 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
985 | spin_unlock_bh(&mpath->state_lock); |
986 | goto enddiscovery; | |
987 | } | |
988 | ||
989 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 990 | target_flags = MP_F_DO; |
050ac52c | 991 | else |
d19b3bf6 | 992 | target_flags = MP_F_RF; |
050ac52c LCC |
993 | |
994 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 995 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
47846c9b | 996 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 997 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
3d045a54 | 998 | cpu_to_le32(mpath->sn), da, 0, |
aa2b5928 | 999 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 1000 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
1001 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1002 | ||
1003 | enddiscovery: | |
1004 | rcu_read_unlock(); | |
1005 | kfree(preq_node); | |
1006 | } | |
1007 | ||
0cfda851 TP |
1008 | /* mesh_nexthop_resolve - lookup next hop for given skb and start path |
1009 | * discovery if no forwarding information is found. | |
050ac52c | 1010 | * |
e32f85f7 | 1011 | * @skb: 802.11 frame to be sent |
f698d856 | 1012 | * @sdata: network subif the frame will be sent through |
050ac52c | 1013 | * |
0cfda851 TP |
1014 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1015 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1016 | */ |
0cfda851 TP |
1017 | int mesh_nexthop_resolve(struct sk_buff *skb, |
1018 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 1019 | { |
e32f85f7 | 1020 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1021 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1022 | struct mesh_path *mpath; | |
1023 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1024 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1025 | int err = 0; |
1026 | ||
1027 | rcu_read_lock(); | |
0cfda851 TP |
1028 | err = mesh_nexthop_lookup(skb, sdata); |
1029 | if (!err) | |
1030 | goto endlookup; | |
050ac52c | 1031 | |
0cfda851 TP |
1032 | /* no nexthop found, start resolving */ |
1033 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1034 | if (!mpath) { |
d19b3bf6 RP |
1035 | mesh_path_add(target_addr, sdata); |
1036 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1037 | if (!mpath) { |
0cfda851 | 1038 | mesh_path_discard_frame(skb, sdata); |
050ac52c LCC |
1039 | err = -ENOSPC; |
1040 | goto endlookup; | |
1041 | } | |
1042 | } | |
1043 | ||
0cfda851 TP |
1044 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1045 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1046 | ||
1047 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1048 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1049 | ||
1050 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1051 | ieee80211_set_qos_hdr(sdata, skb); | |
1052 | skb_queue_tail(&mpath->frame_queue, skb); | |
1053 | err = -ENOENT; | |
1054 | if (skb_to_free) | |
1055 | mesh_path_discard_frame(skb_to_free, sdata); | |
1056 | ||
1057 | endlookup: | |
1058 | rcu_read_unlock(); | |
1059 | return err; | |
1060 | } | |
1061 | /** | |
1062 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1063 | * this function is considered "using" the associated mpath, so preempt a path | |
1064 | * refresh if this mpath expires soon. | |
1065 | * | |
1066 | * @skb: 802.11 frame to be sent | |
1067 | * @sdata: network subif the frame will be sent through | |
1068 | * | |
1069 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1070 | */ | |
1071 | int mesh_nexthop_lookup(struct sk_buff *skb, | |
1072 | struct ieee80211_sub_if_data *sdata) | |
1073 | { | |
1074 | struct mesh_path *mpath; | |
1075 | struct sta_info *next_hop; | |
1076 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1077 | u8 *target_addr = hdr->addr3; | |
1078 | int err = -ENOENT; | |
050ac52c | 1079 | |
0cfda851 TP |
1080 | rcu_read_lock(); |
1081 | mpath = mesh_path_lookup(target_addr, sdata); | |
1082 | ||
1083 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1084 | goto endlookup; | |
1085 | ||
1086 | if (time_after(jiffies, | |
1087 | mpath->exp_time - | |
1088 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
888d04df | 1089 | !compare_ether_addr(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1090 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1091 | !(mpath->flags & MESH_PATH_FIXED)) | |
1092 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1093 | |
0cfda851 TP |
1094 | next_hop = rcu_dereference(mpath->next_hop); |
1095 | if (next_hop) { | |
1096 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1097 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1098 | err = 0; | |
050ac52c LCC |
1099 | } |
1100 | ||
1101 | endlookup: | |
1102 | rcu_read_unlock(); | |
1103 | return err; | |
1104 | } | |
1105 | ||
1106 | void mesh_path_timer(unsigned long data) | |
1107 | { | |
dea4096b JB |
1108 | struct mesh_path *mpath = (void *) data; |
1109 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1110 | int ret; |
5bb644a0 | 1111 | |
dea4096b | 1112 | if (sdata->local->quiescing) |
5bb644a0 | 1113 | return; |
5bb644a0 JB |
1114 | |
1115 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1116 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1117 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1118 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1119 | spin_unlock_bh(&mpath->state_lock); |
1120 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1121 | ++mpath->discovery_retries; |
1122 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1123 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1124 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1125 | mesh_queue_preq(mpath, 0); |
1126 | } else { | |
1127 | mpath->flags = 0; | |
1128 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1129 | spin_unlock_bh(&mpath->state_lock); |
1130 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1131 | ret = mesh_path_send_to_gates(mpath); | |
1132 | if (ret) | |
1133 | mhwmp_dbg("no gate was reachable"); | |
1134 | } else | |
1135 | mesh_path_flush_pending(mpath); | |
050ac52c | 1136 | } |
050ac52c | 1137 | } |
e304bfd3 RP |
1138 | |
1139 | void | |
1140 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1141 | { | |
1142 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1143 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
16dd7267 | 1144 | u8 flags; |
e304bfd3 | 1145 | |
16dd7267 JC |
1146 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1147 | ? RANN_FLAG_IS_GATE : 0; | |
1148 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1149 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1150 | 0, NULL, 0, broadcast_addr, |
45904f21 | 1151 | 0, sdata->u.mesh.mshcfg.element_ttl, |
0507e159 | 1152 | cpu_to_le32(interval), 0, 0, sdata); |
e304bfd3 | 1153 | } |