Commit | Line | Data |
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050ac52c | 1 | /* |
264d9b7d | 2 | * Copyright (c) 2008, 2009 open80211s Ltd. |
050ac52c LCC |
3 | * Author: Luis Carlos Cobo <luisca@cozybit.com> |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
888d04df | 11 | #include <linux/etherdevice.h> |
d26ad377 | 12 | #include <asm/unaligned.h> |
2cca397f | 13 | #include "wme.h" |
050ac52c LCC |
14 | #include "mesh.h" |
15 | ||
27db2e42 | 16 | #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG |
7646887a | 17 | #define mhwmp_dbg(fmt, args...) \ |
f0d23208 | 18 | pr_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) |
d2a079fd CYY |
89 | #define SN_GT(x, y) ((s32)(y - x) < 0) |
90 | #define SN_LT(x, y) ((s32)(x - 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) |
728b19e5 CYY |
101 | #define root_path_confirmation_jiffies(s) \ |
102 | msecs_to_jiffies(sdata->u.mesh.mshcfg.dot11MeshHWMPconfirmationInterval) | |
050ac52c LCC |
103 | |
104 | enum mpath_frame_type { | |
105 | MPATH_PREQ = 0, | |
106 | MPATH_PREP, | |
90a5e169 RP |
107 | MPATH_PERR, |
108 | MPATH_RANN | |
050ac52c LCC |
109 | }; |
110 | ||
15ff6365 JB |
111 | static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
112 | ||
050ac52c | 113 | static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags, |
d19b3bf6 | 114 | u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target, |
15ff6365 JB |
115 | __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl, |
116 | __le32 lifetime, __le32 metric, __le32 preq_id, | |
d19b3bf6 | 117 | struct ieee80211_sub_if_data *sdata) |
050ac52c | 118 | { |
f698d856 | 119 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 120 | struct sk_buff *skb; |
050ac52c | 121 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
122 | u8 *pos, ie_len; |
123 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
124 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 125 | |
65e8b0cc | 126 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
127 | hdr_len + |
128 | 2 + 37); /* max HWMP IE */ | |
050ac52c LCC |
129 | if (!skb) |
130 | return -1; | |
65e8b0cc | 131 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
132 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
133 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
134 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
135 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
136 | |
137 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 138 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
90a5e169 | 139 | /* BSSID == SA */ |
47846c9b | 140 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
141 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; |
142 | mgmt->u.action.u.mesh_action.action_code = | |
143 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
050ac52c LCC |
144 | |
145 | switch (action) { | |
146 | case MPATH_PREQ: | |
7646887a | 147 | mhwmp_dbg("sending PREQ to %pM", target); |
050ac52c LCC |
148 | ie_len = 37; |
149 | pos = skb_put(skb, 2 + ie_len); | |
150 | *pos++ = WLAN_EID_PREQ; | |
151 | break; | |
152 | case MPATH_PREP: | |
7646887a | 153 | mhwmp_dbg("sending PREP to %pM", target); |
050ac52c LCC |
154 | ie_len = 31; |
155 | pos = skb_put(skb, 2 + ie_len); | |
156 | *pos++ = WLAN_EID_PREP; | |
157 | break; | |
90a5e169 | 158 | case MPATH_RANN: |
7646887a | 159 | mhwmp_dbg("sending RANN from %pM", orig_addr); |
90a5e169 RP |
160 | ie_len = sizeof(struct ieee80211_rann_ie); |
161 | pos = skb_put(skb, 2 + ie_len); | |
162 | *pos++ = WLAN_EID_RANN; | |
163 | break; | |
050ac52c | 164 | default: |
812714d7 | 165 | kfree_skb(skb); |
050ac52c LCC |
166 | return -ENOTSUPP; |
167 | break; | |
168 | } | |
169 | *pos++ = ie_len; | |
170 | *pos++ = flags; | |
171 | *pos++ = hop_count; | |
172 | *pos++ = ttl; | |
25d49e4d TP |
173 | if (action == MPATH_PREP) { |
174 | memcpy(pos, target, ETH_ALEN); | |
175 | pos += ETH_ALEN; | |
176 | memcpy(pos, &target_sn, 4); | |
050ac52c | 177 | pos += 4; |
25d49e4d TP |
178 | } else { |
179 | if (action == MPATH_PREQ) { | |
180 | memcpy(pos, &preq_id, 4); | |
181 | pos += 4; | |
182 | } | |
183 | memcpy(pos, orig_addr, ETH_ALEN); | |
184 | pos += ETH_ALEN; | |
185 | memcpy(pos, &orig_sn, 4); | |
90a5e169 RP |
186 | pos += 4; |
187 | } | |
25d49e4d TP |
188 | memcpy(pos, &lifetime, 4); /* interval for RANN */ |
189 | pos += 4; | |
050ac52c LCC |
190 | memcpy(pos, &metric, 4); |
191 | pos += 4; | |
192 | if (action == MPATH_PREQ) { | |
25d49e4d | 193 | *pos++ = 1; /* destination count */ |
d19b3bf6 | 194 | *pos++ = target_flags; |
d19b3bf6 | 195 | memcpy(pos, target, ETH_ALEN); |
90a5e169 | 196 | pos += ETH_ALEN; |
d19b3bf6 | 197 | memcpy(pos, &target_sn, 4); |
25d49e4d TP |
198 | pos += 4; |
199 | } else if (action == MPATH_PREP) { | |
200 | memcpy(pos, orig_addr, ETH_ALEN); | |
201 | pos += ETH_ALEN; | |
202 | memcpy(pos, &orig_sn, 4); | |
203 | pos += 4; | |
90a5e169 | 204 | } |
050ac52c | 205 | |
62ae67be | 206 | ieee80211_tx_skb(sdata, skb); |
050ac52c LCC |
207 | return 0; |
208 | } | |
209 | ||
2cca397f JC |
210 | |
211 | /* Headroom is not adjusted. Caller should ensure that skb has sufficient | |
212 | * headroom in case the frame is encrypted. */ | |
213 | static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata, | |
214 | struct sk_buff *skb) | |
215 | { | |
2cca397f JC |
216 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
217 | ||
218 | skb_set_mac_header(skb, 0); | |
219 | skb_set_network_header(skb, 0); | |
220 | skb_set_transport_header(skb, 0); | |
221 | ||
222 | /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */ | |
223 | skb_set_queue_mapping(skb, IEEE80211_AC_VO); | |
224 | skb->priority = 7; | |
225 | ||
226 | info->control.vif = &sdata->vif; | |
2154c81c | 227 | ieee80211_set_qos_hdr(sdata, skb); |
2cca397f JC |
228 | } |
229 | ||
050ac52c LCC |
230 | /** |
231 | * mesh_send_path error - Sends a PERR mesh management frame | |
232 | * | |
d19b3bf6 RP |
233 | * @target: broken destination |
234 | * @target_sn: SN of the broken destination | |
235 | * @target_rcode: reason code for this PERR | |
050ac52c | 236 | * @ra: node this frame is addressed to |
2cca397f JC |
237 | * |
238 | * Note: This function may be called with driver locks taken that the driver | |
239 | * also acquires in the TX path. To avoid a deadlock we don't transmit the | |
240 | * frame directly but add it to the pending queue instead. | |
050ac52c | 241 | */ |
d19b3bf6 | 242 | int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn, |
15ff6365 JB |
243 | __le16 target_rcode, const u8 *ra, |
244 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 245 | { |
f698d856 | 246 | struct ieee80211_local *local = sdata->local; |
3b69a9c5 | 247 | struct sk_buff *skb; |
dca7e943 | 248 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 249 | struct ieee80211_mgmt *mgmt; |
3b69a9c5 TP |
250 | u8 *pos, ie_len; |
251 | int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.mesh_action) + | |
252 | sizeof(mgmt->u.action.u.mesh_action); | |
050ac52c | 253 | |
dca7e943 TP |
254 | if (time_before(jiffies, ifmsh->next_perr)) |
255 | return -EAGAIN; | |
256 | ||
65e8b0cc | 257 | skb = dev_alloc_skb(local->tx_headroom + |
3b69a9c5 TP |
258 | hdr_len + |
259 | 2 + 15 /* PERR IE */); | |
050ac52c LCC |
260 | if (!skb) |
261 | return -1; | |
65e8b0cc | 262 | skb_reserve(skb, local->tx_headroom); |
3b69a9c5 TP |
263 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); |
264 | memset(mgmt, 0, hdr_len); | |
e7827a70 HH |
265 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
266 | IEEE80211_STYPE_ACTION); | |
050ac52c LCC |
267 | |
268 | memcpy(mgmt->da, ra, ETH_ALEN); | |
47846c9b | 269 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
25d49e4d TP |
270 | /* BSSID == SA */ |
271 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); | |
272 | mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION; | |
273 | mgmt->u.action.u.mesh_action.action_code = | |
274 | WLAN_MESH_ACTION_HWMP_PATH_SELECTION; | |
d611f062 | 275 | ie_len = 15; |
050ac52c LCC |
276 | pos = skb_put(skb, 2 + ie_len); |
277 | *pos++ = WLAN_EID_PERR; | |
278 | *pos++ = ie_len; | |
d611f062 | 279 | /* ttl */ |
45904f21 | 280 | *pos++ = ttl; |
050ac52c LCC |
281 | /* number of destinations */ |
282 | *pos++ = 1; | |
d611f062 RP |
283 | /* |
284 | * flags bit, bit 1 is unset if we know the sequence number and | |
285 | * bit 2 is set if we have a reason code | |
286 | */ | |
287 | *pos = 0; | |
d19b3bf6 | 288 | if (!target_sn) |
d611f062 | 289 | *pos |= MP_F_USN; |
d19b3bf6 | 290 | if (target_rcode) |
d611f062 RP |
291 | *pos |= MP_F_RCODE; |
292 | pos++; | |
d19b3bf6 | 293 | memcpy(pos, target, ETH_ALEN); |
050ac52c | 294 | pos += ETH_ALEN; |
d19b3bf6 | 295 | memcpy(pos, &target_sn, 4); |
d611f062 | 296 | pos += 4; |
d19b3bf6 | 297 | memcpy(pos, &target_rcode, 2); |
050ac52c | 298 | |
2cca397f JC |
299 | /* see note in function header */ |
300 | prepare_frame_for_deferred_tx(sdata, skb); | |
dca7e943 TP |
301 | ifmsh->next_perr = TU_TO_EXP_TIME( |
302 | ifmsh->mshcfg.dot11MeshHWMPperrMinInterval); | |
2cca397f | 303 | ieee80211_add_pending_skb(local, skb); |
050ac52c LCC |
304 | return 0; |
305 | } | |
306 | ||
bfc32e6a | 307 | void ieee80211s_update_metric(struct ieee80211_local *local, |
35b3fe1c | 308 | struct sta_info *sta, struct sk_buff *skb) |
bfc32e6a JC |
309 | { |
310 | struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); | |
311 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
312 | int failed; | |
313 | ||
314 | if (!ieee80211_is_data(hdr->frame_control)) | |
315 | return; | |
316 | ||
317 | failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK); | |
318 | ||
319 | /* moving average, scaled to 100 */ | |
35b3fe1c JC |
320 | sta->fail_avg = ((80 * sta->fail_avg + 5) / 100 + 20 * failed); |
321 | if (sta->fail_avg > 95) | |
322 | mesh_plink_broken(sta); | |
bfc32e6a JC |
323 | } |
324 | ||
050ac52c LCC |
325 | static u32 airtime_link_metric_get(struct ieee80211_local *local, |
326 | struct sta_info *sta) | |
327 | { | |
6b62bf32 | 328 | struct rate_info rinfo; |
050ac52c LCC |
329 | /* This should be adjusted for each device */ |
330 | int device_constant = 1 << ARITH_SHIFT; | |
331 | int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT; | |
332 | int s_unit = 1 << ARITH_SHIFT; | |
333 | int rate, err; | |
334 | u32 tx_time, estimated_retx; | |
335 | u64 result; | |
336 | ||
050ac52c LCC |
337 | if (sta->fail_avg >= 100) |
338 | return MAX_METRIC; | |
e6a9854b | 339 | |
6b62bf32 TP |
340 | sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo); |
341 | rate = cfg80211_calculate_bitrate(&rinfo); | |
342 | if (WARN_ON(!rate)) | |
e6a9854b JB |
343 | return MAX_METRIC; |
344 | ||
050ac52c LCC |
345 | err = (sta->fail_avg << ARITH_SHIFT) / 100; |
346 | ||
347 | /* bitrate is in units of 100 Kbps, while we need rate in units of | |
348 | * 1Mbps. This will be corrected on tx_time computation. | |
349 | */ | |
050ac52c LCC |
350 | tx_time = (device_constant + 10 * test_frame_len / rate); |
351 | estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); | |
352 | result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; | |
353 | return (u32)result; | |
354 | } | |
355 | ||
356 | /** | |
357 | * hwmp_route_info_get - Update routing info to originator and transmitter | |
358 | * | |
f698d856 | 359 | * @sdata: local mesh subif |
050ac52c LCC |
360 | * @mgmt: mesh management frame |
361 | * @hwmp_ie: hwmp information element (PREP or PREQ) | |
362 | * | |
363 | * This function updates the path routing information to the originator and the | |
f99288d1 | 364 | * transmitter of a HWMP PREQ or PREP frame. |
050ac52c LCC |
365 | * |
366 | * Returns: metric to frame originator or 0 if the frame should not be further | |
367 | * processed | |
368 | * | |
369 | * Notes: this function is the only place (besides user-provided info) where | |
370 | * path routing information is updated. | |
371 | */ | |
f698d856 | 372 | static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata, |
050ac52c | 373 | struct ieee80211_mgmt *mgmt, |
dbb81c42 | 374 | u8 *hwmp_ie, enum mpath_frame_type action) |
050ac52c | 375 | { |
f698d856 | 376 | struct ieee80211_local *local = sdata->local; |
050ac52c LCC |
377 | struct mesh_path *mpath; |
378 | struct sta_info *sta; | |
379 | bool fresh_info; | |
380 | u8 *orig_addr, *ta; | |
d19b3bf6 | 381 | u32 orig_sn, orig_metric; |
050ac52c LCC |
382 | unsigned long orig_lifetime, exp_time; |
383 | u32 last_hop_metric, new_metric; | |
384 | bool process = true; | |
050ac52c LCC |
385 | |
386 | rcu_read_lock(); | |
abe60632 | 387 | sta = sta_info_get(sdata, mgmt->sa); |
dc0b0f7d JB |
388 | if (!sta) { |
389 | rcu_read_unlock(); | |
050ac52c | 390 | return 0; |
dc0b0f7d | 391 | } |
050ac52c LCC |
392 | |
393 | last_hop_metric = airtime_link_metric_get(local, sta); | |
394 | /* Update and check originator routing info */ | |
395 | fresh_info = true; | |
396 | ||
397 | switch (action) { | |
398 | case MPATH_PREQ: | |
399 | orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie); | |
d19b3bf6 | 400 | orig_sn = PREQ_IE_ORIG_SN(hwmp_ie); |
050ac52c LCC |
401 | orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie); |
402 | orig_metric = PREQ_IE_METRIC(hwmp_ie); | |
403 | break; | |
404 | case MPATH_PREP: | |
3c26f1f6 TP |
405 | /* Originator here refers to the MP that was the target in the |
406 | * Path Request. We divert from the nomenclature in the draft | |
050ac52c LCC |
407 | * so that we can easily use a single function to gather path |
408 | * information from both PREQ and PREP frames. | |
409 | */ | |
3c26f1f6 TP |
410 | orig_addr = PREP_IE_TARGET_ADDR(hwmp_ie); |
411 | orig_sn = PREP_IE_TARGET_SN(hwmp_ie); | |
050ac52c LCC |
412 | orig_lifetime = PREP_IE_LIFETIME(hwmp_ie); |
413 | orig_metric = PREP_IE_METRIC(hwmp_ie); | |
414 | break; | |
415 | default: | |
dc0b0f7d | 416 | rcu_read_unlock(); |
050ac52c LCC |
417 | return 0; |
418 | } | |
419 | new_metric = orig_metric + last_hop_metric; | |
420 | if (new_metric < orig_metric) | |
421 | new_metric = MAX_METRIC; | |
422 | exp_time = TU_TO_EXP_TIME(orig_lifetime); | |
423 | ||
b203ca39 | 424 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) { |
050ac52c LCC |
425 | /* This MP is the originator, we are not interested in this |
426 | * frame, except for updating transmitter's path info. | |
427 | */ | |
428 | process = false; | |
429 | fresh_info = false; | |
430 | } else { | |
f698d856 | 431 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
432 | if (mpath) { |
433 | spin_lock_bh(&mpath->state_lock); | |
434 | if (mpath->flags & MESH_PATH_FIXED) | |
435 | fresh_info = false; | |
436 | else if ((mpath->flags & MESH_PATH_ACTIVE) && | |
d19b3bf6 RP |
437 | (mpath->flags & MESH_PATH_SN_VALID)) { |
438 | if (SN_GT(mpath->sn, orig_sn) || | |
439 | (mpath->sn == orig_sn && | |
533866b1 | 440 | new_metric >= mpath->metric)) { |
050ac52c LCC |
441 | process = false; |
442 | fresh_info = false; | |
443 | } | |
444 | } | |
445 | } else { | |
f698d856 JBG |
446 | mesh_path_add(orig_addr, sdata); |
447 | mpath = mesh_path_lookup(orig_addr, sdata); | |
050ac52c LCC |
448 | if (!mpath) { |
449 | rcu_read_unlock(); | |
050ac52c LCC |
450 | return 0; |
451 | } | |
452 | spin_lock_bh(&mpath->state_lock); | |
453 | } | |
454 | ||
455 | if (fresh_info) { | |
456 | mesh_path_assign_nexthop(mpath, sta); | |
d19b3bf6 | 457 | mpath->flags |= MESH_PATH_SN_VALID; |
050ac52c | 458 | mpath->metric = new_metric; |
d19b3bf6 | 459 | mpath->sn = orig_sn; |
050ac52c LCC |
460 | mpath->exp_time = time_after(mpath->exp_time, exp_time) |
461 | ? mpath->exp_time : exp_time; | |
462 | mesh_path_activate(mpath); | |
463 | spin_unlock_bh(&mpath->state_lock); | |
464 | mesh_path_tx_pending(mpath); | |
465 | /* draft says preq_id should be saved to, but there does | |
466 | * not seem to be any use for it, skipping by now | |
467 | */ | |
468 | } else | |
469 | spin_unlock_bh(&mpath->state_lock); | |
470 | } | |
471 | ||
472 | /* Update and check transmitter routing info */ | |
473 | ta = mgmt->sa; | |
b203ca39 | 474 | if (ether_addr_equal(orig_addr, ta)) |
050ac52c LCC |
475 | fresh_info = false; |
476 | else { | |
477 | fresh_info = true; | |
478 | ||
f698d856 | 479 | mpath = mesh_path_lookup(ta, sdata); |
050ac52c LCC |
480 | if (mpath) { |
481 | spin_lock_bh(&mpath->state_lock); | |
482 | if ((mpath->flags & MESH_PATH_FIXED) || | |
483 | ((mpath->flags & MESH_PATH_ACTIVE) && | |
484 | (last_hop_metric > mpath->metric))) | |
485 | fresh_info = false; | |
486 | } else { | |
f698d856 JBG |
487 | mesh_path_add(ta, sdata); |
488 | mpath = mesh_path_lookup(ta, sdata); | |
050ac52c LCC |
489 | if (!mpath) { |
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, |
57ef5ddb DW |
515 | u8 *preq_elem, u32 metric) |
516 | { | |
472dbc45 | 517 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
3d045a54 | 518 | struct mesh_path *mpath = NULL; |
d19b3bf6 | 519 | 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 | |
7646887a | 538 | mhwmp_dbg("received PREQ from %pM", orig_addr); |
27db2e42 | 539 | |
b203ca39 | 540 | if (ether_addr_equal(target_addr, sdata->vif.addr)) { |
7646887a | 541 | mhwmp_dbg("PREQ is for us"); |
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(); | |
554 | mpath = mesh_path_lookup(orig_addr, sdata); | |
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(); | |
d19b3bf6 | 569 | mpath = mesh_path_lookup(target_addr, sdata); |
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) { |
7646887a | 593 | mhwmp_dbg("replying to the PREQ"); |
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 | } | |
7646887a | 614 | mhwmp_dbg("forwarding the PREQ from %pM", 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 LCC |
651 | struct ieee80211_mgmt *mgmt, |
652 | u8 *prep_elem, u32 metric) | |
653 | { | |
d665508b | 654 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 655 | struct mesh_path *mpath; |
d19b3bf6 | 656 | 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 | |
7646887a | 661 | mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem)); |
dbb81c42 | 662 | |
3c26f1f6 | 663 | orig_addr = PREP_IE_ORIG_ADDR(prep_elem); |
b203ca39 | 664 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
050ac52c LCC |
665 | /* destination, no forwarding required */ |
666 | return; | |
667 | ||
d665508b CYY |
668 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
669 | return; | |
670 | ||
050ac52c LCC |
671 | ttl = PREP_IE_TTL(prep_elem); |
672 | if (ttl <= 1) { | |
472dbc45 | 673 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
674 | return; |
675 | } | |
676 | ||
677 | rcu_read_lock(); | |
3c26f1f6 | 678 | mpath = mesh_path_lookup(orig_addr, sdata); |
050ac52c LCC |
679 | if (mpath) |
680 | spin_lock_bh(&mpath->state_lock); | |
681 | else | |
682 | goto fail; | |
683 | if (!(mpath->flags & MESH_PATH_ACTIVE)) { | |
684 | spin_unlock_bh(&mpath->state_lock); | |
685 | goto fail; | |
686 | } | |
40b275b6 | 687 | memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN); |
050ac52c LCC |
688 | spin_unlock_bh(&mpath->state_lock); |
689 | --ttl; | |
690 | flags = PREP_IE_FLAGS(prep_elem); | |
691 | lifetime = PREP_IE_LIFETIME(prep_elem); | |
692 | hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1; | |
3c26f1f6 | 693 | target_addr = PREP_IE_TARGET_ADDR(prep_elem); |
d19b3bf6 RP |
694 | target_sn = PREP_IE_TARGET_SN(prep_elem); |
695 | orig_sn = PREP_IE_ORIG_SN(prep_elem); | |
050ac52c LCC |
696 | |
697 | mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr, | |
d19b3bf6 | 698 | cpu_to_le32(orig_sn), 0, target_addr, |
533866b1 | 699 | cpu_to_le32(target_sn), next_hop, hopcount, |
d19b3bf6 | 700 | ttl, cpu_to_le32(lifetime), cpu_to_le32(metric), |
f698d856 | 701 | 0, sdata); |
050ac52c | 702 | rcu_read_unlock(); |
c8a61a7d DW |
703 | |
704 | sdata->u.mesh.mshstats.fwded_unicast++; | |
472dbc45 | 705 | sdata->u.mesh.mshstats.fwded_frames++; |
050ac52c LCC |
706 | return; |
707 | ||
708 | fail: | |
709 | rcu_read_unlock(); | |
472dbc45 | 710 | sdata->u.mesh.mshstats.dropped_frames_no_route++; |
050ac52c LCC |
711 | } |
712 | ||
f698d856 | 713 | static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
714 | struct ieee80211_mgmt *mgmt, u8 *perr_elem) |
715 | { | |
d611f062 | 716 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c | 717 | struct mesh_path *mpath; |
d611f062 | 718 | u8 ttl; |
d19b3bf6 | 719 | u8 *ta, *target_addr; |
d19b3bf6 RP |
720 | u32 target_sn; |
721 | u16 target_rcode; | |
050ac52c LCC |
722 | |
723 | ta = mgmt->sa; | |
d611f062 RP |
724 | ttl = PERR_IE_TTL(perr_elem); |
725 | if (ttl <= 1) { | |
726 | ifmsh->mshstats.dropped_frames_ttl++; | |
727 | return; | |
728 | } | |
729 | ttl--; | |
d19b3bf6 RP |
730 | target_addr = PERR_IE_TARGET_ADDR(perr_elem); |
731 | target_sn = PERR_IE_TARGET_SN(perr_elem); | |
732 | target_rcode = PERR_IE_TARGET_RCODE(perr_elem); | |
d611f062 | 733 | |
050ac52c | 734 | rcu_read_lock(); |
d19b3bf6 | 735 | mpath = mesh_path_lookup(target_addr, sdata); |
050ac52c | 736 | if (mpath) { |
888d04df FF |
737 | struct sta_info *sta; |
738 | ||
050ac52c | 739 | spin_lock_bh(&mpath->state_lock); |
888d04df | 740 | sta = next_hop_deref_protected(mpath); |
050ac52c | 741 | if (mpath->flags & MESH_PATH_ACTIVE && |
b203ca39 | 742 | ether_addr_equal(ta, sta->sta.addr) && |
d19b3bf6 RP |
743 | (!(mpath->flags & MESH_PATH_SN_VALID) || |
744 | SN_GT(target_sn, mpath->sn))) { | |
050ac52c | 745 | mpath->flags &= ~MESH_PATH_ACTIVE; |
d19b3bf6 | 746 | mpath->sn = target_sn; |
050ac52c | 747 | spin_unlock_bh(&mpath->state_lock); |
d665508b CYY |
748 | if (!ifmsh->mshcfg.dot11MeshForwarding) |
749 | goto endperr; | |
d19b3bf6 RP |
750 | mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn), |
751 | cpu_to_le16(target_rcode), | |
15ff6365 | 752 | broadcast_addr, sdata); |
050ac52c LCC |
753 | } else |
754 | spin_unlock_bh(&mpath->state_lock); | |
755 | } | |
d665508b | 756 | endperr: |
050ac52c LCC |
757 | rcu_read_unlock(); |
758 | } | |
759 | ||
90a5e169 RP |
760 | static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata, |
761 | struct ieee80211_mgmt *mgmt, | |
762 | struct ieee80211_rann_ie *rann) | |
763 | { | |
764 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
d2a079fd CYY |
765 | struct ieee80211_local *local = sdata->local; |
766 | struct sta_info *sta; | |
90a5e169 | 767 | struct mesh_path *mpath; |
90a5e169 RP |
768 | u8 ttl, flags, hopcount; |
769 | u8 *orig_addr; | |
d2a079fd | 770 | u32 orig_sn, metric, metric_txsta, interval; |
5ee68e5b | 771 | bool root_is_gate; |
90a5e169 | 772 | |
90a5e169 RP |
773 | ttl = rann->rann_ttl; |
774 | if (ttl <= 1) { | |
775 | ifmsh->mshstats.dropped_frames_ttl++; | |
776 | return; | |
777 | } | |
778 | ttl--; | |
779 | flags = rann->rann_flags; | |
5ee68e5b | 780 | root_is_gate = !!(flags & RANN_FLAG_IS_GATE); |
90a5e169 | 781 | orig_addr = rann->rann_addr; |
292c41ac | 782 | orig_sn = le32_to_cpu(rann->rann_seq); |
d2a079fd | 783 | interval = le32_to_cpu(rann->rann_interval); |
90a5e169 | 784 | hopcount = rann->rann_hopcount; |
a6a58b4f | 785 | hopcount++; |
292c41ac | 786 | metric = le32_to_cpu(rann->rann_metric); |
5ee68e5b JC |
787 | |
788 | /* Ignore our own RANNs */ | |
b203ca39 | 789 | if (ether_addr_equal(orig_addr, sdata->vif.addr)) |
5ee68e5b JC |
790 | return; |
791 | ||
3d045a54 CYY |
792 | mhwmp_dbg("received RANN from %pM via neighbour %pM (is_gate=%d)", |
793 | orig_addr, mgmt->sa, root_is_gate); | |
90a5e169 RP |
794 | |
795 | rcu_read_lock(); | |
d2a079fd CYY |
796 | sta = sta_info_get(sdata, mgmt->sa); |
797 | if (!sta) { | |
798 | rcu_read_unlock(); | |
799 | return; | |
800 | } | |
801 | ||
802 | metric_txsta = airtime_link_metric_get(local, sta); | |
803 | ||
90a5e169 RP |
804 | mpath = mesh_path_lookup(orig_addr, sdata); |
805 | if (!mpath) { | |
806 | mesh_path_add(orig_addr, sdata); | |
807 | mpath = mesh_path_lookup(orig_addr, sdata); | |
808 | if (!mpath) { | |
809 | rcu_read_unlock(); | |
810 | sdata->u.mesh.mshstats.dropped_frames_no_route++; | |
811 | return; | |
812 | } | |
90a5e169 | 813 | } |
5ee68e5b JC |
814 | |
815 | if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) || | |
728b19e5 CYY |
816 | (time_after(jiffies, mpath->last_preq_to_root + |
817 | root_path_confirmation_jiffies(sdata)) || | |
818 | time_before(jiffies, mpath->last_preq_to_root))) && | |
5ee68e5b JC |
819 | !(mpath->flags & MESH_PATH_FIXED)) { |
820 | mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name, | |
821 | orig_addr); | |
822 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
728b19e5 | 823 | mpath->last_preq_to_root = jiffies; |
5ee68e5b JC |
824 | } |
825 | ||
d2a079fd CYY |
826 | if ((SN_LT(mpath->sn, orig_sn) || (mpath->sn == orig_sn && |
827 | metric < mpath->rann_metric)) && ifmsh->mshcfg.dot11MeshForwarding) { | |
90a5e169 | 828 | mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr, |
d19b3bf6 | 829 | cpu_to_le32(orig_sn), |
15ff6365 | 830 | 0, NULL, 0, broadcast_addr, |
0507e159 | 831 | hopcount, ttl, cpu_to_le32(interval), |
d2a079fd | 832 | cpu_to_le32(metric + metric_txsta), |
90a5e169 | 833 | 0, sdata); |
d19b3bf6 | 834 | mpath->sn = orig_sn; |
d2a079fd | 835 | mpath->rann_metric = metric + metric_txsta; |
35bcd591 CYY |
836 | /* Recording RANNs sender address to send individually |
837 | * addressed PREQs destined for root mesh STA */ | |
838 | memcpy(mpath->rann_snd_addr, mgmt->sa, ETH_ALEN); | |
90a5e169 | 839 | } |
3d045a54 | 840 | |
3d045a54 CYY |
841 | mpath->is_root = true; |
842 | ||
5ee68e5b JC |
843 | if (root_is_gate) |
844 | mesh_path_add_gate(mpath); | |
845 | ||
90a5e169 RP |
846 | rcu_read_unlock(); |
847 | } | |
050ac52c LCC |
848 | |
849 | ||
f698d856 | 850 | void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata, |
050ac52c LCC |
851 | struct ieee80211_mgmt *mgmt, |
852 | size_t len) | |
853 | { | |
854 | struct ieee802_11_elems elems; | |
855 | size_t baselen; | |
856 | u32 last_hop_metric; | |
97091317 | 857 | struct sta_info *sta; |
050ac52c | 858 | |
9c80d3dc JB |
859 | /* need action_code */ |
860 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) | |
861 | return; | |
862 | ||
97091317 JC |
863 | rcu_read_lock(); |
864 | sta = sta_info_get(sdata, mgmt->sa); | |
865 | if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) { | |
866 | rcu_read_unlock(); | |
867 | return; | |
868 | } | |
869 | rcu_read_unlock(); | |
870 | ||
050ac52c LCC |
871 | baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt; |
872 | ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable, | |
873 | len - baselen, &elems); | |
874 | ||
dbb81c42 RP |
875 | if (elems.preq) { |
876 | if (elems.preq_len != 37) | |
050ac52c LCC |
877 | /* Right now we support just 1 destination and no AE */ |
878 | return; | |
dbb81c42 RP |
879 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq, |
880 | MPATH_PREQ); | |
881 | if (last_hop_metric) | |
882 | hwmp_preq_frame_process(sdata, mgmt, elems.preq, | |
883 | last_hop_metric); | |
884 | } | |
885 | if (elems.prep) { | |
886 | if (elems.prep_len != 31) | |
050ac52c LCC |
887 | /* Right now we support no AE */ |
888 | return; | |
dbb81c42 RP |
889 | last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep, |
890 | MPATH_PREP); | |
891 | if (last_hop_metric) | |
892 | hwmp_prep_frame_process(sdata, mgmt, elems.prep, | |
893 | last_hop_metric); | |
894 | } | |
895 | if (elems.perr) { | |
d611f062 | 896 | if (elems.perr_len != 15) |
050ac52c LCC |
897 | /* Right now we support only one destination per PERR */ |
898 | return; | |
f698d856 | 899 | hwmp_perr_frame_process(sdata, mgmt, elems.perr); |
050ac52c | 900 | } |
90a5e169 RP |
901 | if (elems.rann) |
902 | hwmp_rann_frame_process(sdata, mgmt, elems.rann); | |
050ac52c LCC |
903 | } |
904 | ||
905 | /** | |
906 | * mesh_queue_preq - queue a PREQ to a given destination | |
907 | * | |
908 | * @mpath: mesh path to discover | |
909 | * @flags: special attributes of the PREQ to be sent | |
910 | * | |
911 | * Locking: the function must be called from within a rcu read lock block. | |
912 | * | |
913 | */ | |
914 | static void mesh_queue_preq(struct mesh_path *mpath, u8 flags) | |
915 | { | |
f698d856 | 916 | struct ieee80211_sub_if_data *sdata = mpath->sdata; |
472dbc45 | 917 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
918 | struct mesh_preq_queue *preq_node; |
919 | ||
59615b5f | 920 | preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC); |
050ac52c | 921 | if (!preq_node) { |
7646887a | 922 | mhwmp_dbg("could not allocate PREQ node"); |
050ac52c LCC |
923 | return; |
924 | } | |
925 | ||
987dafad | 926 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 | 927 | if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) { |
987dafad | 928 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
929 | kfree(preq_node); |
930 | if (printk_ratelimit()) | |
7646887a | 931 | mhwmp_dbg("PREQ node queue full"); |
050ac52c LCC |
932 | return; |
933 | } | |
934 | ||
f2dc7989 | 935 | spin_lock(&mpath->state_lock); |
f3011cf9 | 936 | if (mpath->flags & MESH_PATH_REQ_QUEUED) { |
f2dc7989 | 937 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 938 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
88d53465 | 939 | kfree(preq_node); |
f3011cf9 JC |
940 | return; |
941 | } | |
942 | ||
050ac52c LCC |
943 | memcpy(preq_node->dst, mpath->dst, ETH_ALEN); |
944 | preq_node->flags = flags; | |
945 | ||
f3011cf9 | 946 | mpath->flags |= MESH_PATH_REQ_QUEUED; |
f2dc7989 | 947 | spin_unlock(&mpath->state_lock); |
f3011cf9 | 948 | |
472dbc45 JB |
949 | list_add_tail(&preq_node->list, &ifmsh->preq_queue.list); |
950 | ++ifmsh->preq_queue_len; | |
987dafad | 951 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c | 952 | |
472dbc45 | 953 | if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) |
64592c8f | 954 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 955 | |
472dbc45 | 956 | else if (time_before(jiffies, ifmsh->last_preq)) { |
050ac52c LCC |
957 | /* avoid long wait if did not send preqs for a long time |
958 | * and jiffies wrapped around | |
959 | */ | |
472dbc45 | 960 | ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1; |
64592c8f | 961 | ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
050ac52c | 962 | } else |
472dbc45 | 963 | mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq + |
050ac52c LCC |
964 | min_preq_int_jiff(sdata)); |
965 | } | |
966 | ||
967 | /** | |
968 | * mesh_path_start_discovery - launch a path discovery from the PREQ queue | |
969 | * | |
f698d856 | 970 | * @sdata: local mesh subif |
050ac52c | 971 | */ |
f698d856 | 972 | void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) |
050ac52c | 973 | { |
472dbc45 | 974 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
050ac52c LCC |
975 | struct mesh_preq_queue *preq_node; |
976 | struct mesh_path *mpath; | |
d19b3bf6 | 977 | u8 ttl, target_flags; |
3d045a54 | 978 | const u8 *da; |
050ac52c LCC |
979 | u32 lifetime; |
980 | ||
a43816df | 981 | spin_lock_bh(&ifmsh->mesh_preq_queue_lock); |
472dbc45 JB |
982 | if (!ifmsh->preq_queue_len || |
983 | time_before(jiffies, ifmsh->last_preq + | |
050ac52c | 984 | min_preq_int_jiff(sdata))) { |
a43816df | 985 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
986 | return; |
987 | } | |
988 | ||
472dbc45 | 989 | preq_node = list_first_entry(&ifmsh->preq_queue.list, |
050ac52c LCC |
990 | struct mesh_preq_queue, list); |
991 | list_del(&preq_node->list); | |
472dbc45 | 992 | --ifmsh->preq_queue_len; |
a43816df | 993 | spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); |
050ac52c LCC |
994 | |
995 | rcu_read_lock(); | |
f698d856 | 996 | mpath = mesh_path_lookup(preq_node->dst, sdata); |
050ac52c LCC |
997 | if (!mpath) |
998 | goto enddiscovery; | |
999 | ||
1000 | spin_lock_bh(&mpath->state_lock); | |
f3011cf9 | 1001 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
050ac52c LCC |
1002 | if (preq_node->flags & PREQ_Q_F_START) { |
1003 | if (mpath->flags & MESH_PATH_RESOLVING) { | |
1004 | spin_unlock_bh(&mpath->state_lock); | |
1005 | goto enddiscovery; | |
1006 | } else { | |
1007 | mpath->flags &= ~MESH_PATH_RESOLVED; | |
1008 | mpath->flags |= MESH_PATH_RESOLVING; | |
1009 | mpath->discovery_retries = 0; | |
1010 | mpath->discovery_timeout = disc_timeout_jiff(sdata); | |
1011 | } | |
1012 | } else if (!(mpath->flags & MESH_PATH_RESOLVING) || | |
1013 | mpath->flags & MESH_PATH_RESOLVED) { | |
1014 | mpath->flags &= ~MESH_PATH_RESOLVING; | |
1015 | spin_unlock_bh(&mpath->state_lock); | |
1016 | goto enddiscovery; | |
1017 | } | |
1018 | ||
472dbc45 | 1019 | ifmsh->last_preq = jiffies; |
050ac52c | 1020 | |
d19b3bf6 | 1021 | if (time_after(jiffies, ifmsh->last_sn_update + |
050ac52c | 1022 | net_traversal_jiffies(sdata)) || |
d19b3bf6 RP |
1023 | time_before(jiffies, ifmsh->last_sn_update)) { |
1024 | ++ifmsh->sn; | |
1025 | sdata->u.mesh.last_sn_update = jiffies; | |
050ac52c LCC |
1026 | } |
1027 | lifetime = default_lifetime(sdata); | |
45904f21 | 1028 | ttl = sdata->u.mesh.mshcfg.element_ttl; |
050ac52c | 1029 | if (ttl == 0) { |
472dbc45 | 1030 | sdata->u.mesh.mshstats.dropped_frames_ttl++; |
050ac52c LCC |
1031 | spin_unlock_bh(&mpath->state_lock); |
1032 | goto enddiscovery; | |
1033 | } | |
1034 | ||
1035 | if (preq_node->flags & PREQ_Q_F_REFRESH) | |
d19b3bf6 | 1036 | target_flags = MP_F_DO; |
050ac52c | 1037 | else |
d19b3bf6 | 1038 | target_flags = MP_F_RF; |
050ac52c LCC |
1039 | |
1040 | spin_unlock_bh(&mpath->state_lock); | |
3d045a54 | 1041 | da = (mpath->is_root) ? mpath->rann_snd_addr : broadcast_addr; |
47846c9b | 1042 | mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr, |
d19b3bf6 | 1043 | cpu_to_le32(ifmsh->sn), target_flags, mpath->dst, |
3d045a54 | 1044 | cpu_to_le32(mpath->sn), da, 0, |
aa2b5928 | 1045 | ttl, cpu_to_le32(lifetime), 0, |
472dbc45 | 1046 | cpu_to_le32(ifmsh->preq_id++), sdata); |
050ac52c LCC |
1047 | mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout); |
1048 | ||
1049 | enddiscovery: | |
1050 | rcu_read_unlock(); | |
1051 | kfree(preq_node); | |
1052 | } | |
1053 | ||
0cfda851 TP |
1054 | /* mesh_nexthop_resolve - lookup next hop for given skb and start path |
1055 | * discovery if no forwarding information is found. | |
050ac52c | 1056 | * |
e32f85f7 | 1057 | * @skb: 802.11 frame to be sent |
f698d856 | 1058 | * @sdata: network subif the frame will be sent through |
050ac52c | 1059 | * |
0cfda851 TP |
1060 | * Returns: 0 if the next hop was found and -ENOENT if the frame was queued. |
1061 | * skb is freeed here if no mpath could be allocated. | |
050ac52c | 1062 | */ |
0cfda851 TP |
1063 | int mesh_nexthop_resolve(struct sk_buff *skb, |
1064 | struct ieee80211_sub_if_data *sdata) | |
050ac52c | 1065 | { |
e32f85f7 | 1066 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
0cfda851 TP |
1067 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1068 | struct mesh_path *mpath; | |
1069 | struct sk_buff *skb_to_free = NULL; | |
d19b3bf6 | 1070 | u8 *target_addr = hdr->addr3; |
050ac52c LCC |
1071 | int err = 0; |
1072 | ||
1073 | rcu_read_lock(); | |
0cfda851 TP |
1074 | err = mesh_nexthop_lookup(skb, sdata); |
1075 | if (!err) | |
1076 | goto endlookup; | |
050ac52c | 1077 | |
0cfda851 TP |
1078 | /* no nexthop found, start resolving */ |
1079 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1080 | if (!mpath) { |
d19b3bf6 RP |
1081 | mesh_path_add(target_addr, sdata); |
1082 | mpath = mesh_path_lookup(target_addr, sdata); | |
050ac52c | 1083 | if (!mpath) { |
0cfda851 | 1084 | mesh_path_discard_frame(skb, sdata); |
050ac52c LCC |
1085 | err = -ENOSPC; |
1086 | goto endlookup; | |
1087 | } | |
1088 | } | |
1089 | ||
0cfda851 TP |
1090 | if (!(mpath->flags & MESH_PATH_RESOLVING)) |
1091 | mesh_queue_preq(mpath, PREQ_Q_F_START); | |
1092 | ||
1093 | if (skb_queue_len(&mpath->frame_queue) >= MESH_FRAME_QUEUE_LEN) | |
1094 | skb_to_free = skb_dequeue(&mpath->frame_queue); | |
1095 | ||
1096 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; | |
1097 | ieee80211_set_qos_hdr(sdata, skb); | |
1098 | skb_queue_tail(&mpath->frame_queue, skb); | |
1099 | err = -ENOENT; | |
1100 | if (skb_to_free) | |
1101 | mesh_path_discard_frame(skb_to_free, sdata); | |
1102 | ||
1103 | endlookup: | |
1104 | rcu_read_unlock(); | |
1105 | return err; | |
1106 | } | |
1107 | /** | |
1108 | * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame. Calling | |
1109 | * this function is considered "using" the associated mpath, so preempt a path | |
1110 | * refresh if this mpath expires soon. | |
1111 | * | |
1112 | * @skb: 802.11 frame to be sent | |
1113 | * @sdata: network subif the frame will be sent through | |
1114 | * | |
1115 | * Returns: 0 if the next hop was found. Nonzero otherwise. | |
1116 | */ | |
1117 | int mesh_nexthop_lookup(struct sk_buff *skb, | |
1118 | struct ieee80211_sub_if_data *sdata) | |
1119 | { | |
1120 | struct mesh_path *mpath; | |
1121 | struct sta_info *next_hop; | |
1122 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
1123 | u8 *target_addr = hdr->addr3; | |
1124 | int err = -ENOENT; | |
050ac52c | 1125 | |
0cfda851 TP |
1126 | rcu_read_lock(); |
1127 | mpath = mesh_path_lookup(target_addr, sdata); | |
1128 | ||
1129 | if (!mpath || !(mpath->flags & MESH_PATH_ACTIVE)) | |
1130 | goto endlookup; | |
1131 | ||
1132 | if (time_after(jiffies, | |
1133 | mpath->exp_time - | |
1134 | msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) && | |
b203ca39 | 1135 | ether_addr_equal(sdata->vif.addr, hdr->addr4) && |
0cfda851 TP |
1136 | !(mpath->flags & MESH_PATH_RESOLVING) && |
1137 | !(mpath->flags & MESH_PATH_FIXED)) | |
1138 | mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH); | |
050ac52c | 1139 | |
0cfda851 TP |
1140 | next_hop = rcu_dereference(mpath->next_hop); |
1141 | if (next_hop) { | |
1142 | memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN); | |
1143 | memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); | |
1144 | err = 0; | |
050ac52c LCC |
1145 | } |
1146 | ||
1147 | endlookup: | |
1148 | rcu_read_unlock(); | |
1149 | return err; | |
1150 | } | |
1151 | ||
1152 | void mesh_path_timer(unsigned long data) | |
1153 | { | |
dea4096b JB |
1154 | struct mesh_path *mpath = (void *) data; |
1155 | struct ieee80211_sub_if_data *sdata = mpath->sdata; | |
5ee68e5b | 1156 | int ret; |
5bb644a0 | 1157 | |
dea4096b | 1158 | if (sdata->local->quiescing) |
5bb644a0 | 1159 | return; |
5bb644a0 JB |
1160 | |
1161 | spin_lock_bh(&mpath->state_lock); | |
cfa22c71 | 1162 | if (mpath->flags & MESH_PATH_RESOLVED || |
5ee68e5b | 1163 | (!(mpath->flags & MESH_PATH_RESOLVING))) { |
050ac52c | 1164 | mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED); |
5ee68e5b JC |
1165 | spin_unlock_bh(&mpath->state_lock); |
1166 | } else if (mpath->discovery_retries < max_preq_retries(sdata)) { | |
050ac52c LCC |
1167 | ++mpath->discovery_retries; |
1168 | mpath->discovery_timeout *= 2; | |
f3011cf9 | 1169 | mpath->flags &= ~MESH_PATH_REQ_QUEUED; |
5ee68e5b | 1170 | spin_unlock_bh(&mpath->state_lock); |
050ac52c LCC |
1171 | mesh_queue_preq(mpath, 0); |
1172 | } else { | |
1173 | mpath->flags = 0; | |
1174 | mpath->exp_time = jiffies; | |
5ee68e5b JC |
1175 | spin_unlock_bh(&mpath->state_lock); |
1176 | if (!mpath->is_gate && mesh_gate_num(sdata) > 0) { | |
1177 | ret = mesh_path_send_to_gates(mpath); | |
1178 | if (ret) | |
1179 | mhwmp_dbg("no gate was reachable"); | |
1180 | } else | |
1181 | mesh_path_flush_pending(mpath); | |
050ac52c | 1182 | } |
050ac52c | 1183 | } |
e304bfd3 RP |
1184 | |
1185 | void | |
1186 | mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata) | |
1187 | { | |
1188 | struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; | |
0507e159 | 1189 | u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval; |
a69cc44f | 1190 | u8 flags, target_flags = 0; |
e304bfd3 | 1191 | |
16dd7267 JC |
1192 | flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol) |
1193 | ? RANN_FLAG_IS_GATE : 0; | |
a69cc44f CYY |
1194 | |
1195 | switch (ifmsh->mshcfg.dot11MeshHWMPRootMode) { | |
1196 | case IEEE80211_PROACTIVE_RANN: | |
1197 | mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr, | |
e304bfd3 | 1198 | cpu_to_le32(++ifmsh->sn), |
15ff6365 | 1199 | 0, NULL, 0, broadcast_addr, |
a69cc44f | 1200 | 0, ifmsh->mshcfg.element_ttl, |
0507e159 | 1201 | cpu_to_le32(interval), 0, 0, sdata); |
a69cc44f CYY |
1202 | break; |
1203 | case IEEE80211_PROACTIVE_PREQ_WITH_PREP: | |
1204 | flags |= IEEE80211_PREQ_PROACTIVE_PREP_FLAG; | |
1205 | case IEEE80211_PROACTIVE_PREQ_NO_PREP: | |
1206 | interval = ifmsh->mshcfg.dot11MeshHWMPactivePathToRootTimeout; | |
1207 | target_flags |= IEEE80211_PREQ_TO_FLAG | | |
1208 | IEEE80211_PREQ_USN_FLAG; | |
1209 | mesh_path_sel_frame_tx(MPATH_PREQ, flags, sdata->vif.addr, | |
1210 | cpu_to_le32(++ifmsh->sn), target_flags, | |
1211 | (u8 *) broadcast_addr, 0, broadcast_addr, | |
1212 | 0, ifmsh->mshcfg.element_ttl, | |
1213 | cpu_to_le32(interval), | |
1214 | 0, cpu_to_le32(ifmsh->preq_id++), sdata); | |
1215 | break; | |
1216 | default: | |
1217 | mhwmp_dbg("Proactive mechanism not supported"); | |
1218 | return; | |
1219 | } | |
e304bfd3 | 1220 | } |