blob: 63427d983216cc47120a22850a15a65dc0085592 [file] [log] [blame]
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +01001/*
2 * Copyright (c) 2008 open80211s Ltd.
3 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
4 * Javier Cardona <javier@cozybit.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -070011#include <asm/unaligned.h>
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010012#include "ieee80211_i.h"
13#include "mesh.h"
14
Johannes Berg472dbc42008-09-11 00:01:49 +020015#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
16#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
17
Rui Paulo34917072009-11-09 23:46:39 +000018#define MESHCONF_PP_OFFSET 0 /* Path Selection Protocol */
19#define MESHCONF_PM_OFFSET 1 /* Path Selection Metric */
20#define MESHCONF_CC_OFFSET 2 /* Congestion Control Mode */
21#define MESHCONF_SP_OFFSET 3 /* Synchronization Protocol */
22#define MESHCONF_AUTH_OFFSET 4 /* Authentication Protocol */
23#define MESHCONF_CAPAB_OFFSET 6
24#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
25#define MESHCONF_CAPAB_FORWARDING 0x08
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010026
Johannes Berg5bb644a2009-05-17 11:40:42 +020027#define TMR_RUNNING_HK 0
28#define TMR_RUNNING_MP 1
29
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010030int mesh_allocated;
31static struct kmem_cache *rm_cache;
32
33void ieee80211s_init(void)
34{
35 mesh_pathtbl_init();
36 mesh_allocated = 1;
37 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
38 0, 0, NULL);
39}
40
41void ieee80211s_stop(void)
42{
43 mesh_pathtbl_unregister();
44 kmem_cache_destroy(rm_cache);
45}
46
Johannes Berg472dbc42008-09-11 00:01:49 +020047static void ieee80211_mesh_housekeeping_timer(unsigned long data)
48{
49 struct ieee80211_sub_if_data *sdata = (void *) data;
50 struct ieee80211_local *local = sdata->local;
51 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
52
Rui Paulo6b9ac442009-10-20 21:21:48 +010053 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020054
55 if (local->quiescing) {
56 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
57 return;
58 }
59
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -070060 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020061}
62
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010063/**
64 * mesh_matches_local - check if the config of a mesh point matches ours
65 *
66 * @ie: information elements of a management frame from the mesh peer
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120067 * @sdata: local mesh subif
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010068 *
69 * This function checks if the mesh configuration of a mesh point matches the
70 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
71 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120072bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010073{
Johannes Berg472dbc42008-09-11 00:01:49 +020074 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010075
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010076 /*
77 * As support for each feature is added, check for matching
78 * - On mesh config capabilities
79 * - Power Save Support En
80 * - Sync support enabled
81 * - Sync support active
82 * - Sync support required from peer
83 * - MDA enabled
84 * - Power management control on fc
85 */
Johannes Berg472dbc42008-09-11 00:01:49 +020086 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
87 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
Rui Paulo34917072009-11-09 23:46:39 +000088 (ifmsh->mesh_pp_id == *(ie->mesh_config + MESHCONF_PP_OFFSET))&&
89 (ifmsh->mesh_pm_id == *(ie->mesh_config + MESHCONF_PM_OFFSET))&&
90 (ifmsh->mesh_cc_id == *(ie->mesh_config + MESHCONF_CC_OFFSET))&&
91 (ifmsh->mesh_sp_id == *(ie->mesh_config + MESHCONF_SP_OFFSET))&&
92 (ifmsh->mesh_auth_id == *(ie->mesh_config +
93 MESHCONF_AUTH_OFFSET)))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010094 return true;
95
96 return false;
97}
98
99/**
100 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
101 *
102 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100103 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200104bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100105{
Rui Paulo34917072009-11-09 23:46:39 +0000106 return (*(ie->mesh_config + MESHCONF_CAPAB_OFFSET) &
107 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100108}
109
110/**
111 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
112 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100113 * @sdata: mesh interface in which mesh beacons are going to be updated
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100114 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100115void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100116{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100117 bool free_plinks;
118
119 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
120 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800121 * are already on the table but are not on PLINK_ESTAB state. However,
122 * in general the mesh interface is not accepting peer link requests
123 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100124 */
125 free_plinks = mesh_plink_availables(sdata);
126
Johannes Berg472dbc42008-09-11 00:01:49 +0200127 if (free_plinks != sdata->u.mesh.accepting_plinks)
128 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100129}
130
Johannes Berg472dbc42008-09-11 00:01:49 +0200131void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100132{
Rui Paulo34917072009-11-09 23:46:39 +0000133 sta->mesh_pp_id = 0; /* HWMP */
134 sta->mesh_pm_id = 0; /* Airtime */
135 sta->mesh_cc_id = 0; /* Disabled */
136 sta->mesh_sp_id = 0; /* Neighbor Offset */
137 sta->mesh_auth_id = 0; /* Disabled */
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100138}
139
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200140int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100141{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100142 int i;
143
Johannes Berg472dbc42008-09-11 00:01:49 +0200144 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
145 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100146 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200147 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100148 for (i = 0; i < RMC_BUCKETS; i++)
Johannes Berg472dbc42008-09-11 00:01:49 +0200149 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100150 return 0;
151}
152
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200153void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100154{
Johannes Berg472dbc42008-09-11 00:01:49 +0200155 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100156 struct rmc_entry *p, *n;
157 int i;
158
Johannes Berg472dbc42008-09-11 00:01:49 +0200159 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100160 return;
161
162 for (i = 0; i < RMC_BUCKETS; i++)
163 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
164 list_del(&p->list);
165 kmem_cache_free(rm_cache, p);
166 }
167
168 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200169 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100170}
171
172/**
173 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
174 *
175 * @sa: source address
176 * @mesh_hdr: mesh_header
177 *
178 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
179 *
180 * Checks using the source address and the mesh sequence number if we have
181 * received this frame lately. If the frame is not in the cache, it is added to
182 * it.
183 */
184int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200185 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100186{
Johannes Berg472dbc42008-09-11 00:01:49 +0200187 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100188 u32 seqnum = 0;
189 int entries = 0;
190 u8 idx;
191 struct rmc_entry *p, *n;
192
193 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700194 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
195 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100196 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
197 ++entries;
198 if (time_after(jiffies, p->exp_time) ||
199 (entries == RMC_QUEUE_MAX_LEN)) {
200 list_del(&p->list);
201 kmem_cache_free(rm_cache, p);
202 --entries;
203 } else if ((seqnum == p->seqnum)
204 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
205 return -1;
206 }
207
208 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
209 if (!p) {
210 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
211 return 0;
212 }
213 p->seqnum = seqnum;
214 p->exp_time = jiffies + RMC_TIMEOUT;
215 memcpy(p->sa, sa, ETH_ALEN);
216 list_add(&p->list, &rmc->bucket[idx].list);
217 return 0;
218}
219
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200220void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100221{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200222 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100223 struct ieee80211_supported_band *sband;
224 u8 *pos;
225 int len, i, rate;
Rui Paulo8f2fda92009-11-09 23:46:41 +0000226 u8 neighbors;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100227
228 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
229 len = sband->n_bitrates;
230 if (len > 8)
231 len = 8;
232 pos = skb_put(skb, len + 2);
233 *pos++ = WLAN_EID_SUPP_RATES;
234 *pos++ = len;
235 for (i = 0; i < len; i++) {
236 rate = sband->bitrates[i].bitrate;
237 *pos++ = (u8) (rate / 5);
238 }
239
240 if (sband->n_bitrates > len) {
241 pos = skb_put(skb, sband->n_bitrates - len + 2);
242 *pos++ = WLAN_EID_EXT_SUPP_RATES;
243 *pos++ = sband->n_bitrates - len;
244 for (i = len; i < sband->n_bitrates; i++) {
245 rate = sband->bitrates[i].bitrate;
246 *pos++ = (u8) (rate / 5);
247 }
248 }
249
Johannes Berg472dbc42008-09-11 00:01:49 +0200250 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100251 *pos++ = WLAN_EID_MESH_ID;
Johannes Berg472dbc42008-09-11 00:01:49 +0200252 *pos++ = sdata->u.mesh.mesh_id_len;
253 if (sdata->u.mesh.mesh_id_len)
254 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100255
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700256 pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100257 *pos++ = WLAN_EID_MESH_CONFIG;
Johannes Berg1239cd52008-10-28 11:12:57 +0100258 *pos++ = IEEE80211_MESH_CONFIG_LEN;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100259
260 /* Active path selection protocol ID */
Rui Paulo34917072009-11-09 23:46:39 +0000261 *pos++ = sdata->u.mesh.mesh_pp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100262
263 /* Active path selection metric ID */
Rui Paulo34917072009-11-09 23:46:39 +0000264 *pos++ = sdata->u.mesh.mesh_pm_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100265
266 /* Congestion control mode identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000267 *pos++ = sdata->u.mesh.mesh_cc_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100268
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700269 /* Synchronization protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000270 *pos++ = sdata->u.mesh.mesh_sp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100271
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700272 /* Authentication Protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000273 *pos++ = sdata->u.mesh.mesh_auth_id;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700274
Rui Paulo8f2fda92009-11-09 23:46:41 +0000275 /* Mesh Formation Info - number of neighbors */
276 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
277 /* Number of neighbor mesh STAs or 15 whichever is smaller */
278 neighbors = (neighbors > 15) ? 15 : neighbors;
279 *pos++ = neighbors << 1;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700280
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100281 /* Mesh capability */
Johannes Berg472dbc42008-09-11 00:01:49 +0200282 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
Rui Paulo34917072009-11-09 23:46:39 +0000283 *pos = MESHCONF_CAPAB_FORWARDING;
284 *pos++ |= sdata->u.mesh.accepting_plinks ?
285 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100286 *pos++ = 0x00;
287
288 return;
289}
290
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200291u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100292{
293 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200294 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100295 & tbl->hash_mask;
296}
297
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100298struct mesh_table *mesh_table_alloc(int size_order)
299{
300 int i;
301 struct mesh_table *newtbl;
302
303 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
304 if (!newtbl)
305 return NULL;
306
307 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
308 (1 << size_order), GFP_KERNEL);
309
310 if (!newtbl->hash_buckets) {
311 kfree(newtbl);
312 return NULL;
313 }
314
315 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
316 (1 << size_order), GFP_KERNEL);
317 if (!newtbl->hashwlock) {
318 kfree(newtbl->hash_buckets);
319 kfree(newtbl);
320 return NULL;
321 }
322
323 newtbl->size_order = size_order;
324 newtbl->hash_mask = (1 << size_order) - 1;
325 atomic_set(&newtbl->entries, 0);
326 get_random_bytes(&newtbl->hash_rnd,
327 sizeof(newtbl->hash_rnd));
328 for (i = 0; i <= newtbl->hash_mask; i++)
329 spin_lock_init(&newtbl->hashwlock[i]);
330
331 return newtbl;
332}
333
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100334
335static void ieee80211_mesh_path_timer(unsigned long data)
336{
337 struct ieee80211_sub_if_data *sdata =
338 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200339 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200340 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100341
Johannes Berg5bb644a2009-05-17 11:40:42 +0200342 if (local->quiescing) {
343 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
344 return;
345 }
346
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700347 ieee80211_queue_work(&local->hw, &ifmsh->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100348}
349
Johannes Berg902acc72008-02-23 15:17:19 +0100350/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700351 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
352 * @hdr: 802.11 frame header
353 * @fc: frame control field
354 * @meshda: destination address in the mesh
355 * @meshsa: source address address in the mesh. Same as TA, as frame is
356 * locally originated.
357 *
358 * Return the length of the 802.11 (does not include a mesh control header)
359 */
360int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
361 *meshda, char *meshsa) {
362 if (is_multicast_ether_addr(meshda)) {
363 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
364 /* DA TA SA */
365 memcpy(hdr->addr1, meshda, ETH_ALEN);
366 memcpy(hdr->addr2, meshsa, ETH_ALEN);
367 memcpy(hdr->addr3, meshsa, ETH_ALEN);
368 return 24;
369 } else {
370 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
371 IEEE80211_FCTL_TODS);
372 /* RA TA DA SA */
373 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
374 memcpy(hdr->addr2, meshsa, ETH_ALEN);
375 memcpy(hdr->addr3, meshda, ETH_ALEN);
376 memcpy(hdr->addr4, meshsa, ETH_ALEN);
377 return 30;
378 }
379}
380
381/**
Johannes Berg902acc72008-02-23 15:17:19 +0100382 * ieee80211_new_mesh_header - create a new mesh header
383 * @meshhdr: uninitialized mesh header
384 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700385 * @addr4: addr4 of the mesh frame (1st in ae header)
386 * may be NULL
387 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
388 * may be NULL unless addr6 is present
389 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
390 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100391 *
392 * Return the header length.
393 */
394int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700395 struct ieee80211_sub_if_data *sdata, char *addr4,
396 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100397{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700398 int aelen = 0;
399 memset(meshhdr, 0, sizeof(meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200400 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
401 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
402 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700403 if (addr4) {
404 meshhdr->flags |= MESH_FLAGS_AE_A4;
405 aelen += ETH_ALEN;
406 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
407 }
408 if (addr5 && addr6) {
409 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
410 aelen += 2 * ETH_ALEN;
411 if (!addr4) {
412 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
413 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
414 } else {
415 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
416 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
417 }
418 }
419 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100420}
421
Johannes Berg472dbc42008-09-11 00:01:49 +0200422static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
423 struct ieee80211_if_mesh *ifmsh)
424{
425 bool free_plinks;
426
427#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
428 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
429 sdata->dev->name);
430#endif
431
432 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
433 mesh_path_expire(sdata);
434
435 free_plinks = mesh_plink_availables(sdata);
436 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200437 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200438
Johannes Berg472dbc42008-09-11 00:01:49 +0200439 mod_timer(&ifmsh->housekeeping_timer,
440 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
441}
442
Johannes Berg5bb644a2009-05-17 11:40:42 +0200443#ifdef CONFIG_PM
444void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
445{
446 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
447
448 /* might restart the timer but that doesn't matter */
449 cancel_work_sync(&ifmsh->work);
450
451 /* use atomic bitops in case both timers fire at the same time */
452
453 if (del_timer_sync(&ifmsh->housekeeping_timer))
454 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
455 if (del_timer_sync(&ifmsh->mesh_path_timer))
456 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
457}
458
459void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
460{
461 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
462
463 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
464 add_timer(&ifmsh->housekeeping_timer);
465 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
466 add_timer(&ifmsh->mesh_path_timer);
467}
468#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200469
470void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
471{
472 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
473 struct ieee80211_local *local = sdata->local;
474
Rui Paulo6b9ac442009-10-20 21:21:48 +0100475 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Javier Cardona18889232009-08-10 12:15:52 -0700476 ieee80211_queue_work(&local->hw, &ifmsh->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700477 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200478 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700479 BSS_CHANGED_BEACON_ENABLED |
480 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200481}
482
483void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
484{
485 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
486 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200487 * If the timer fired while we waited for it, it will have
488 * requeued the work. Now the work will be running again
489 * but will not rearm the timer again because it checks
490 * whether the interface is running, which, at this point,
491 * it no longer is.
492 */
493 cancel_work_sync(&sdata->u.mesh.work);
494
495 /*
Johannes Berg472dbc42008-09-11 00:01:49 +0200496 * When we get here, the interface is marked down.
497 * Call synchronize_rcu() to wait for the RX path
498 * should it be using the interface and enqueuing
499 * frames at this very time on another CPU.
500 */
Jesper Dangaard Brouer4a270962009-06-26 10:45:53 +0000501 rcu_barrier(); /* Wait for RX path and call_rcu()'s */
Johannes Berg472dbc42008-09-11 00:01:49 +0200502 skb_queue_purge(&sdata->u.mesh.skb_queue);
503}
504
505static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
506 u16 stype,
507 struct ieee80211_mgmt *mgmt,
508 size_t len,
509 struct ieee80211_rx_status *rx_status)
510{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200511 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200512 struct ieee802_11_elems elems;
513 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100514 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200515 size_t baselen;
516 int freq;
517 enum ieee80211_band band = rx_status->band;
518
519 /* ignore ProbeResp to foreign address */
520 if (stype == IEEE80211_STYPE_PROBE_RESP &&
521 compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
522 return;
523
524 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
525 if (baselen > len)
526 return;
527
528 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
529 &elems);
530
531 if (elems.ds_params && elems.ds_params_len == 1)
532 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
533 else
534 freq = rx_status->freq;
535
536 channel = ieee80211_get_channel(local->hw.wiphy, freq);
537
538 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
539 return;
540
541 if (elems.mesh_id && elems.mesh_config &&
542 mesh_matches_local(&elems, sdata)) {
543 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
544
545 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
546 mesh_peer_accepts_plinks(&elems));
547 }
548}
549
550static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
551 struct ieee80211_mgmt *mgmt,
552 size_t len,
553 struct ieee80211_rx_status *rx_status)
554{
555 switch (mgmt->u.action.category) {
Rui Paulo09383932009-11-09 23:46:43 +0000556 case MESH_PLINK_CATEGORY:
Johannes Berg472dbc42008-09-11 00:01:49 +0200557 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
558 break;
559 case MESH_PATH_SEL_CATEGORY:
560 mesh_rx_path_sel_frame(sdata, mgmt, len);
561 break;
562 }
563}
564
565static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
566 struct sk_buff *skb)
567{
568 struct ieee80211_rx_status *rx_status;
569 struct ieee80211_if_mesh *ifmsh;
570 struct ieee80211_mgmt *mgmt;
571 u16 stype;
572
573 ifmsh = &sdata->u.mesh;
574
Johannes Bergf1d58c22009-06-17 13:13:00 +0200575 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200576 mgmt = (struct ieee80211_mgmt *) skb->data;
577 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
578
579 switch (stype) {
580 case IEEE80211_STYPE_PROBE_RESP:
581 case IEEE80211_STYPE_BEACON:
582 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
583 rx_status);
584 break;
585 case IEEE80211_STYPE_ACTION:
586 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
587 break;
588 }
589
590 kfree_skb(skb);
591}
592
593static void ieee80211_mesh_work(struct work_struct *work)
594{
595 struct ieee80211_sub_if_data *sdata =
596 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
597 struct ieee80211_local *local = sdata->local;
598 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
599 struct sk_buff *skb;
600
601 if (!netif_running(sdata->dev))
602 return;
603
Helmut Schaafbe9c422009-07-23 12:14:04 +0200604 if (local->scanning)
Johannes Berg472dbc42008-09-11 00:01:49 +0200605 return;
606
607 while ((skb = skb_dequeue(&ifmsh->skb_queue)))
608 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
609
610 if (ifmsh->preq_queue_len &&
611 time_after(jiffies,
612 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
613 mesh_path_start_discovery(sdata);
614
Javier Cardona18889232009-08-10 12:15:52 -0700615 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
616 mesh_mpath_table_grow();
617
618 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
619 mesh_mpp_table_grow();
620
621 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200622 ieee80211_mesh_housekeeping(sdata, ifmsh);
623}
624
625void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
626{
627 struct ieee80211_sub_if_data *sdata;
628
629 rcu_read_lock();
630 list_for_each_entry_rcu(sdata, &local->interfaces, list)
631 if (ieee80211_vif_is_mesh(&sdata->vif))
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700632 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200633 rcu_read_unlock();
634}
635
Johannes Berg902acc72008-02-23 15:17:19 +0100636void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
637{
Johannes Berg472dbc42008-09-11 00:01:49 +0200638 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100639
Johannes Berg472dbc42008-09-11 00:01:49 +0200640 INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
641 setup_timer(&ifmsh->housekeeping_timer,
642 ieee80211_mesh_housekeeping_timer,
643 (unsigned long) sdata);
644 skb_queue_head_init(&sdata->u.mesh.skb_queue);
645
646 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
647 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
648 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
649 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
650 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
651 ifmsh->mshcfg.auto_open_plinks = true;
652 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
Johannes Berg902acc72008-02-23 15:17:19 +0100653 MESH_MAX_ESTAB_PLINKS;
Johannes Berg472dbc42008-09-11 00:01:49 +0200654 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100655 MESH_PATH_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200656 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
Johannes Berg902acc72008-02-23 15:17:19 +0100657 MESH_PREQ_MIN_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200658 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
Johannes Berg902acc72008-02-23 15:17:19 +0100659 MESH_DIAM_TRAVERSAL_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200660 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
Johannes Berg902acc72008-02-23 15:17:19 +0100661 MESH_MAX_PREQ_RETRIES;
Johannes Berg472dbc42008-09-11 00:01:49 +0200662 ifmsh->mshcfg.path_refresh_time =
Johannes Berg902acc72008-02-23 15:17:19 +0100663 MESH_PATH_REFRESH_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200664 ifmsh->mshcfg.min_discovery_timeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100665 MESH_MIN_DISCOVERY_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200666 ifmsh->accepting_plinks = true;
667 ifmsh->preq_id = 0;
668 ifmsh->dsn = 0;
669 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200670 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200671 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100672 /* Allocate all mesh structures when creating the first mesh interface. */
673 if (!mesh_allocated)
674 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200675 mesh_ids_set_default(ifmsh);
676 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100677 ieee80211_mesh_path_timer,
678 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200679 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
680 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
681}
682
683ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200684ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200685{
686 struct ieee80211_local *local = sdata->local;
687 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
688 struct ieee80211_mgmt *mgmt;
689 u16 fc;
690
691 if (skb->len < 24)
692 return RX_DROP_MONITOR;
693
694 mgmt = (struct ieee80211_mgmt *) skb->data;
695 fc = le16_to_cpu(mgmt->frame_control);
696
697 switch (fc & IEEE80211_FCTL_STYPE) {
Johannes Berga43816d2009-07-10 11:39:26 +0200698 case IEEE80211_STYPE_ACTION:
699 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
700 return RX_DROP_MONITOR;
701 /* fall through */
Johannes Berg472dbc42008-09-11 00:01:49 +0200702 case IEEE80211_STYPE_PROBE_RESP:
703 case IEEE80211_STYPE_BEACON:
Johannes Berg472dbc42008-09-11 00:01:49 +0200704 skb_queue_tail(&ifmsh->skb_queue, skb);
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700705 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200706 return RX_QUEUED;
707 }
708
709 return RX_CONTINUE;
Johannes Berg902acc72008-02-23 15:17:19 +0100710}