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Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +01001/*
Rui Paulo264d9b72009-11-09 23:46:58 +00002 * Copyright (c) 2008, 2009 open80211s Ltd.
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +01003 * 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)
Rui Pauloe304bfd2009-11-09 23:46:56 +000017#define IEEE80211_MESH_RANN_INTERVAL (1 * HZ)
Johannes Berg472dbc42008-09-11 00:01:49 +020018
Rui Paulo34917072009-11-09 23:46:39 +000019#define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
20#define MESHCONF_CAPAB_FORWARDING 0x08
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010021
Johannes Berg5bb644a2009-05-17 11:40:42 +020022#define TMR_RUNNING_HK 0
23#define TMR_RUNNING_MP 1
Rui Pauloe304bfd2009-11-09 23:46:56 +000024#define TMR_RUNNING_MPR 2
Johannes Berg5bb644a2009-05-17 11:40:42 +020025
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010026int mesh_allocated;
27static struct kmem_cache *rm_cache;
28
29void ieee80211s_init(void)
30{
31 mesh_pathtbl_init();
32 mesh_allocated = 1;
33 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
34 0, 0, NULL);
35}
36
37void ieee80211s_stop(void)
38{
39 mesh_pathtbl_unregister();
40 kmem_cache_destroy(rm_cache);
41}
42
Johannes Berg472dbc42008-09-11 00:01:49 +020043static void ieee80211_mesh_housekeeping_timer(unsigned long data)
44{
45 struct ieee80211_sub_if_data *sdata = (void *) data;
46 struct ieee80211_local *local = sdata->local;
47 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
48
Rui Paulo6b9ac442009-10-20 21:21:48 +010049 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Johannes Berg5bb644a2009-05-17 11:40:42 +020050
51 if (local->quiescing) {
52 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
53 return;
54 }
55
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -070056 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +020057}
58
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010059/**
60 * mesh_matches_local - check if the config of a mesh point matches ours
61 *
62 * @ie: information elements of a management frame from the mesh peer
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120063 * @sdata: local mesh subif
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010064 *
65 * This function checks if the mesh configuration of a mesh point matches the
66 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
67 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120068bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010069{
Johannes Berg472dbc42008-09-11 00:01:49 +020070 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010071
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010072 /*
73 * As support for each feature is added, check for matching
74 * - On mesh config capabilities
75 * - Power Save Support En
76 * - Sync support enabled
77 * - Sync support active
78 * - Sync support required from peer
79 * - MDA enabled
80 * - Power management control on fc
81 */
Johannes Berg472dbc42008-09-11 00:01:49 +020082 if (ifmsh->mesh_id_len == ie->mesh_id_len &&
83 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
Rui Paulo136cfa22009-11-18 18:40:00 +000084 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
85 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
86 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
87 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
88 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010089 return true;
90
91 return false;
92}
93
94/**
95 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
96 *
97 * @ie: information elements of a management frame from the mesh peer
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +010098 */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +120099bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100100{
Rui Paulo136cfa22009-11-18 18:40:00 +0000101 return (ie->mesh_config->meshconf_cap &
Rui Paulo34917072009-11-09 23:46:39 +0000102 MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100103}
104
105/**
106 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
107 *
Johannes Bergd0709a62008-02-25 16:27:46 +0100108 * @sdata: mesh interface in which mesh beacons are going to be updated
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100109 */
Johannes Bergd0709a62008-02-25 16:27:46 +0100110void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100111{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100112 bool free_plinks;
113
114 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
115 * the mesh interface might be able to establish plinks with peers that
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800116 * are already on the table but are not on PLINK_ESTAB state. However,
117 * in general the mesh interface is not accepting peer link requests
118 * from new peers, and that must be reflected in the beacon
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100119 */
120 free_plinks = mesh_plink_availables(sdata);
121
Johannes Berg472dbc42008-09-11 00:01:49 +0200122 if (free_plinks != sdata->u.mesh.accepting_plinks)
123 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100124}
125
Johannes Berg472dbc42008-09-11 00:01:49 +0200126void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100127{
Rui Paulo34917072009-11-09 23:46:39 +0000128 sta->mesh_pp_id = 0; /* HWMP */
129 sta->mesh_pm_id = 0; /* Airtime */
130 sta->mesh_cc_id = 0; /* Disabled */
131 sta->mesh_sp_id = 0; /* Neighbor Offset */
132 sta->mesh_auth_id = 0; /* Disabled */
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100133}
134
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200135int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100136{
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100137 int i;
138
Johannes Berg472dbc42008-09-11 00:01:49 +0200139 sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
140 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100141 return -ENOMEM;
Johannes Berg472dbc42008-09-11 00:01:49 +0200142 sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100143 for (i = 0; i < RMC_BUCKETS; i++)
Johannes Berg472dbc42008-09-11 00:01:49 +0200144 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100145 return 0;
146}
147
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200148void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100149{
Johannes Berg472dbc42008-09-11 00:01:49 +0200150 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100151 struct rmc_entry *p, *n;
152 int i;
153
Johannes Berg472dbc42008-09-11 00:01:49 +0200154 if (!sdata->u.mesh.rmc)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100155 return;
156
157 for (i = 0; i < RMC_BUCKETS; i++)
158 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
159 list_del(&p->list);
160 kmem_cache_free(rm_cache, p);
161 }
162
163 kfree(rmc);
Johannes Berg472dbc42008-09-11 00:01:49 +0200164 sdata->u.mesh.rmc = NULL;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100165}
166
167/**
168 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
169 *
170 * @sa: source address
171 * @mesh_hdr: mesh_header
172 *
173 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
174 *
175 * Checks using the source address and the mesh sequence number if we have
176 * received this frame lately. If the frame is not in the cache, it is added to
177 * it.
178 */
179int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200180 struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100181{
Johannes Berg472dbc42008-09-11 00:01:49 +0200182 struct mesh_rmc *rmc = sdata->u.mesh.rmc;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100183 u32 seqnum = 0;
184 int entries = 0;
185 u8 idx;
186 struct rmc_entry *p, *n;
187
188 /* Don't care about endianness since only match matters */
Luis Carlos Cobo51cedda2008-04-23 12:15:29 -0700189 memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
190 idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100191 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
192 ++entries;
193 if (time_after(jiffies, p->exp_time) ||
194 (entries == RMC_QUEUE_MAX_LEN)) {
195 list_del(&p->list);
196 kmem_cache_free(rm_cache, p);
197 --entries;
Joe Perchesf64f9e72009-11-29 16:55:45 -0800198 } else if ((seqnum == p->seqnum) &&
199 (memcmp(sa, p->sa, ETH_ALEN) == 0))
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100200 return -1;
201 }
202
203 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
204 if (!p) {
205 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
206 return 0;
207 }
208 p->seqnum = seqnum;
209 p->exp_time = jiffies + RMC_TIMEOUT;
210 memcpy(p->sa, sa, ETH_ALEN);
211 list_add(&p->list, &rmc->bucket[idx].list);
212 return 0;
213}
214
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200215void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100216{
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200217 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100218 struct ieee80211_supported_band *sband;
219 u8 *pos;
220 int len, i, rate;
Rui Paulo8f2fda92009-11-09 23:46:41 +0000221 u8 neighbors;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100222
223 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
224 len = sband->n_bitrates;
225 if (len > 8)
226 len = 8;
227 pos = skb_put(skb, len + 2);
228 *pos++ = WLAN_EID_SUPP_RATES;
229 *pos++ = len;
230 for (i = 0; i < len; i++) {
231 rate = sband->bitrates[i].bitrate;
232 *pos++ = (u8) (rate / 5);
233 }
234
235 if (sband->n_bitrates > len) {
236 pos = skb_put(skb, sband->n_bitrates - len + 2);
237 *pos++ = WLAN_EID_EXT_SUPP_RATES;
238 *pos++ = sband->n_bitrates - len;
239 for (i = len; i < sband->n_bitrates; i++) {
240 rate = sband->bitrates[i].bitrate;
241 *pos++ = (u8) (rate / 5);
242 }
243 }
244
Rui Paulobe125c62009-11-09 23:46:54 +0000245 if (sband->band == IEEE80211_BAND_2GHZ) {
246 pos = skb_put(skb, 2 + 1);
247 *pos++ = WLAN_EID_DS_PARAMS;
248 *pos++ = 1;
249 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
250 }
251
Johannes Berg472dbc42008-09-11 00:01:49 +0200252 pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100253 *pos++ = WLAN_EID_MESH_ID;
Johannes Berg472dbc42008-09-11 00:01:49 +0200254 *pos++ = sdata->u.mesh.mesh_id_len;
255 if (sdata->u.mesh.mesh_id_len)
256 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100257
Rui Paulo136cfa22009-11-18 18:40:00 +0000258 pos = skb_put(skb, 2 + sizeof(struct ieee80211_meshconf_ie));
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100259 *pos++ = WLAN_EID_MESH_CONFIG;
Rui Paulo136cfa22009-11-18 18:40:00 +0000260 *pos++ = sizeof(struct ieee80211_meshconf_ie);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100261
262 /* Active path selection protocol ID */
Rui Paulo34917072009-11-09 23:46:39 +0000263 *pos++ = sdata->u.mesh.mesh_pp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100264
265 /* Active path selection metric ID */
Rui Paulo34917072009-11-09 23:46:39 +0000266 *pos++ = sdata->u.mesh.mesh_pm_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100267
268 /* Congestion control mode identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000269 *pos++ = sdata->u.mesh.mesh_cc_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100270
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700271 /* Synchronization protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000272 *pos++ = sdata->u.mesh.mesh_sp_id;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100273
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700274 /* Authentication Protocol identifier */
Rui Paulo34917072009-11-09 23:46:39 +0000275 *pos++ = sdata->u.mesh.mesh_auth_id;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700276
Rui Paulo8f2fda92009-11-09 23:46:41 +0000277 /* Mesh Formation Info - number of neighbors */
278 neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
279 /* Number of neighbor mesh STAs or 15 whichever is smaller */
280 neighbors = (neighbors > 15) ? 15 : neighbors;
281 *pos++ = neighbors << 1;
Javier Cardona9e03fdf2009-08-20 09:21:45 -0700282
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100283 /* Mesh capability */
Johannes Berg472dbc42008-09-11 00:01:49 +0200284 sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
Rui Paulo34917072009-11-09 23:46:39 +0000285 *pos = MESHCONF_CAPAB_FORWARDING;
286 *pos++ |= sdata->u.mesh.accepting_plinks ?
287 MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100288 *pos++ = 0x00;
289
290 return;
291}
292
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200293u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100294{
295 /* Use last four bytes of hw addr and interface index as hash index */
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200296 return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100297 & tbl->hash_mask;
298}
299
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100300struct mesh_table *mesh_table_alloc(int size_order)
301{
302 int i;
303 struct mesh_table *newtbl;
304
305 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
306 if (!newtbl)
307 return NULL;
308
309 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
310 (1 << size_order), GFP_KERNEL);
311
312 if (!newtbl->hash_buckets) {
313 kfree(newtbl);
314 return NULL;
315 }
316
317 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
318 (1 << size_order), GFP_KERNEL);
319 if (!newtbl->hashwlock) {
320 kfree(newtbl->hash_buckets);
321 kfree(newtbl);
322 return NULL;
323 }
324
325 newtbl->size_order = size_order;
326 newtbl->hash_mask = (1 << size_order) - 1;
327 atomic_set(&newtbl->entries, 0);
328 get_random_bytes(&newtbl->hash_rnd,
329 sizeof(newtbl->hash_rnd));
330 for (i = 0; i <= newtbl->hash_mask; i++)
331 spin_lock_init(&newtbl->hashwlock[i]);
332
333 return newtbl;
334}
335
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100336
337static void ieee80211_mesh_path_timer(unsigned long data)
338{
339 struct ieee80211_sub_if_data *sdata =
340 (struct ieee80211_sub_if_data *) data;
Johannes Berg472dbc42008-09-11 00:01:49 +0200341 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg133b8222008-09-16 14:18:59 +0200342 struct ieee80211_local *local = sdata->local;
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100343
Johannes Berg5bb644a2009-05-17 11:40:42 +0200344 if (local->quiescing) {
345 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
346 return;
347 }
348
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700349 ieee80211_queue_work(&local->hw, &ifmsh->work);
Luis Carlos Cobo2e3c8732008-02-23 15:17:09 +0100350}
351
Rui Pauloe304bfd2009-11-09 23:46:56 +0000352static void ieee80211_mesh_path_root_timer(unsigned long data)
353{
354 struct ieee80211_sub_if_data *sdata =
355 (struct ieee80211_sub_if_data *) data;
356 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
357 struct ieee80211_local *local = sdata->local;
358
359 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
360
361 if (local->quiescing) {
362 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
363 return;
364 }
365
366 ieee80211_queue_work(&local->hw, &ifmsh->work);
367}
368
Rui Paulo63c57232009-11-09 23:46:57 +0000369void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
370{
371 if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
372 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
373 else {
374 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
375 /* stop running timer */
376 del_timer_sync(&ifmsh->mesh_path_root_timer);
377 }
378}
379
Johannes Berg902acc72008-02-23 15:17:19 +0100380/**
Javier Cardona3c5772a2009-08-10 12:15:48 -0700381 * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
382 * @hdr: 802.11 frame header
383 * @fc: frame control field
384 * @meshda: destination address in the mesh
385 * @meshsa: source address address in the mesh. Same as TA, as frame is
386 * locally originated.
387 *
388 * Return the length of the 802.11 (does not include a mesh control header)
389 */
Johannes Berg15ff6362009-11-17 13:34:04 +0100390int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
391 const u8 *meshda, const u8 *meshsa)
392{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700393 if (is_multicast_ether_addr(meshda)) {
394 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
395 /* DA TA SA */
396 memcpy(hdr->addr1, meshda, ETH_ALEN);
397 memcpy(hdr->addr2, meshsa, ETH_ALEN);
398 memcpy(hdr->addr3, meshsa, ETH_ALEN);
399 return 24;
400 } else {
401 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
402 IEEE80211_FCTL_TODS);
403 /* RA TA DA SA */
404 memset(hdr->addr1, 0, ETH_ALEN); /* RA is resolved later */
405 memcpy(hdr->addr2, meshsa, ETH_ALEN);
406 memcpy(hdr->addr3, meshda, ETH_ALEN);
407 memcpy(hdr->addr4, meshsa, ETH_ALEN);
408 return 30;
409 }
410}
411
412/**
Johannes Berg902acc72008-02-23 15:17:19 +0100413 * ieee80211_new_mesh_header - create a new mesh header
414 * @meshhdr: uninitialized mesh header
415 * @sdata: mesh interface to be used
Javier Cardona3c5772a2009-08-10 12:15:48 -0700416 * @addr4: addr4 of the mesh frame (1st in ae header)
417 * may be NULL
418 * @addr5: addr5 of the mesh frame (1st or 2nd in ae header)
419 * may be NULL unless addr6 is present
420 * @addr6: addr6 of the mesh frame (2nd or 3rd in ae header)
421 * may be NULL unless addr5 is present
Johannes Berg902acc72008-02-23 15:17:19 +0100422 *
423 * Return the header length.
424 */
425int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
Javier Cardona3c5772a2009-08-10 12:15:48 -0700426 struct ieee80211_sub_if_data *sdata, char *addr4,
427 char *addr5, char *addr6)
Johannes Berg902acc72008-02-23 15:17:19 +0100428{
Javier Cardona3c5772a2009-08-10 12:15:48 -0700429 int aelen = 0;
Julia Lawall0c3cee72009-12-09 20:25:59 +0100430 memset(meshhdr, 0, sizeof(*meshhdr));
Johannes Berg472dbc42008-09-11 00:01:49 +0200431 meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
432 put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
433 sdata->u.mesh.mesh_seqnum++;
Javier Cardona3c5772a2009-08-10 12:15:48 -0700434 if (addr4) {
435 meshhdr->flags |= MESH_FLAGS_AE_A4;
436 aelen += ETH_ALEN;
437 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
438 }
439 if (addr5 && addr6) {
440 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
441 aelen += 2 * ETH_ALEN;
442 if (!addr4) {
443 memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
444 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
445 } else {
446 memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
447 memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
448 }
449 }
450 return 6 + aelen;
Johannes Berg902acc72008-02-23 15:17:19 +0100451}
452
Johannes Berg472dbc42008-09-11 00:01:49 +0200453static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
454 struct ieee80211_if_mesh *ifmsh)
455{
456 bool free_plinks;
457
458#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
459 printk(KERN_DEBUG "%s: running mesh housekeeping\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100460 sdata->name);
Johannes Berg472dbc42008-09-11 00:01:49 +0200461#endif
462
463 ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
464 mesh_path_expire(sdata);
465
466 free_plinks = mesh_plink_availables(sdata);
467 if (free_plinks != sdata->u.mesh.accepting_plinks)
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200468 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
Johannes Berg472dbc42008-09-11 00:01:49 +0200469
Johannes Berg472dbc42008-09-11 00:01:49 +0200470 mod_timer(&ifmsh->housekeeping_timer,
471 round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
472}
473
Rui Pauloe304bfd2009-11-09 23:46:56 +0000474static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
475{
476 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
477
478 mesh_path_tx_root_frame(sdata);
479 mod_timer(&ifmsh->mesh_path_root_timer,
480 round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
481}
482
Johannes Berg5bb644a2009-05-17 11:40:42 +0200483#ifdef CONFIG_PM
484void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
485{
486 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
487
488 /* might restart the timer but that doesn't matter */
489 cancel_work_sync(&ifmsh->work);
490
491 /* use atomic bitops in case both timers fire at the same time */
492
493 if (del_timer_sync(&ifmsh->housekeeping_timer))
494 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
495 if (del_timer_sync(&ifmsh->mesh_path_timer))
496 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000497 if (del_timer_sync(&ifmsh->mesh_path_root_timer))
498 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200499}
500
501void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
502{
503 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
504
505 if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
506 add_timer(&ifmsh->housekeeping_timer);
507 if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
508 add_timer(&ifmsh->mesh_path_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000509 if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
510 add_timer(&ifmsh->mesh_path_root_timer);
Rui Paulo63c57232009-11-09 23:46:57 +0000511 ieee80211_mesh_root_setup(ifmsh);
Johannes Berg5bb644a2009-05-17 11:40:42 +0200512}
513#endif
Johannes Berg472dbc42008-09-11 00:01:49 +0200514
515void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
516{
517 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
518 struct ieee80211_local *local = sdata->local;
519
Rui Paulo6b9ac442009-10-20 21:21:48 +0100520 set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
Rui Paulo63c57232009-11-09 23:46:57 +0000521 ieee80211_mesh_root_setup(ifmsh);
Javier Cardona18889232009-08-10 12:15:52 -0700522 ieee80211_queue_work(&local->hw, &ifmsh->work);
Javier Cardona5b365832009-08-10 12:15:51 -0700523 sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
Johannes Berg2d0ddec2009-04-23 16:13:26 +0200524 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
Javier Cardona5b365832009-08-10 12:15:51 -0700525 BSS_CHANGED_BEACON_ENABLED |
526 BSS_CHANGED_BEACON_INT);
Johannes Berg472dbc42008-09-11 00:01:49 +0200527}
528
529void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
530{
531 del_timer_sync(&sdata->u.mesh.housekeeping_timer);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000532 del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
Johannes Berg472dbc42008-09-11 00:01:49 +0200533 /*
Johannes Bergb7413432008-09-11 00:01:50 +0200534 * If the timer fired while we waited for it, it will have
535 * requeued the work. Now the work will be running again
536 * but will not rearm the timer again because it checks
537 * whether the interface is running, which, at this point,
538 * it no longer is.
539 */
540 cancel_work_sync(&sdata->u.mesh.work);
541
542 /*
Johannes Berg472dbc42008-09-11 00:01:49 +0200543 * When we get here, the interface is marked down.
544 * Call synchronize_rcu() to wait for the RX path
545 * should it be using the interface and enqueuing
546 * frames at this very time on another CPU.
547 */
Jesper Dangaard Brouer4a270962009-06-26 10:45:53 +0000548 rcu_barrier(); /* Wait for RX path and call_rcu()'s */
Johannes Berg472dbc42008-09-11 00:01:49 +0200549 skb_queue_purge(&sdata->u.mesh.skb_queue);
550}
551
552static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
553 u16 stype,
554 struct ieee80211_mgmt *mgmt,
555 size_t len,
556 struct ieee80211_rx_status *rx_status)
557{
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200558 struct ieee80211_local *local = sdata->local;
Johannes Berg472dbc42008-09-11 00:01:49 +0200559 struct ieee802_11_elems elems;
560 struct ieee80211_channel *channel;
Johannes Berg881d9482009-01-21 15:13:48 +0100561 u32 supp_rates = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200562 size_t baselen;
563 int freq;
564 enum ieee80211_band band = rx_status->band;
565
566 /* ignore ProbeResp to foreign address */
567 if (stype == IEEE80211_STYPE_PROBE_RESP &&
Johannes Berg47846c92009-11-25 17:46:19 +0100568 compare_ether_addr(mgmt->da, sdata->vif.addr))
Johannes Berg472dbc42008-09-11 00:01:49 +0200569 return;
570
571 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
572 if (baselen > len)
573 return;
574
575 ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
576 &elems);
577
578 if (elems.ds_params && elems.ds_params_len == 1)
579 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
580 else
581 freq = rx_status->freq;
582
583 channel = ieee80211_get_channel(local->hw.wiphy, freq);
584
585 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
586 return;
587
588 if (elems.mesh_id && elems.mesh_config &&
589 mesh_matches_local(&elems, sdata)) {
590 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
591
592 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
593 mesh_peer_accepts_plinks(&elems));
594 }
595}
596
597static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
598 struct ieee80211_mgmt *mgmt,
599 size_t len,
600 struct ieee80211_rx_status *rx_status)
601{
602 switch (mgmt->u.action.category) {
Javier Cardona97ad9132010-03-29 11:00:21 -0700603 case WLAN_CATEGORY_MESH_PLINK:
Johannes Berg472dbc42008-09-11 00:01:49 +0200604 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
605 break;
Javier Cardona97ad9132010-03-29 11:00:21 -0700606 case WLAN_CATEGORY_MESH_PATH_SEL:
Johannes Berg472dbc42008-09-11 00:01:49 +0200607 mesh_rx_path_sel_frame(sdata, mgmt, len);
608 break;
609 }
610}
611
612static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
613 struct sk_buff *skb)
614{
615 struct ieee80211_rx_status *rx_status;
616 struct ieee80211_if_mesh *ifmsh;
617 struct ieee80211_mgmt *mgmt;
618 u16 stype;
619
620 ifmsh = &sdata->u.mesh;
621
Johannes Bergf1d58c22009-06-17 13:13:00 +0200622 rx_status = IEEE80211_SKB_RXCB(skb);
Johannes Berg472dbc42008-09-11 00:01:49 +0200623 mgmt = (struct ieee80211_mgmt *) skb->data;
624 stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
625
626 switch (stype) {
627 case IEEE80211_STYPE_PROBE_RESP:
628 case IEEE80211_STYPE_BEACON:
629 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
630 rx_status);
631 break;
632 case IEEE80211_STYPE_ACTION:
633 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
634 break;
635 }
636
637 kfree_skb(skb);
638}
639
640static void ieee80211_mesh_work(struct work_struct *work)
641{
642 struct ieee80211_sub_if_data *sdata =
643 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
644 struct ieee80211_local *local = sdata->local;
645 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
646 struct sk_buff *skb;
647
Johannes Berg9607e6b2009-12-23 13:15:31 +0100648 if (!ieee80211_sdata_running(sdata))
Johannes Berg472dbc42008-09-11 00:01:49 +0200649 return;
650
Helmut Schaafbe9c422009-07-23 12:14:04 +0200651 if (local->scanning)
Johannes Berg472dbc42008-09-11 00:01:49 +0200652 return;
653
654 while ((skb = skb_dequeue(&ifmsh->skb_queue)))
655 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
656
657 if (ifmsh->preq_queue_len &&
658 time_after(jiffies,
659 ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
660 mesh_path_start_discovery(sdata);
661
Javier Cardona18889232009-08-10 12:15:52 -0700662 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
663 mesh_mpath_table_grow();
664
665 if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
666 mesh_mpp_table_grow();
667
668 if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
Johannes Berg472dbc42008-09-11 00:01:49 +0200669 ieee80211_mesh_housekeeping(sdata, ifmsh);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000670
671 if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
672 ieee80211_mesh_rootpath(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200673}
674
675void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
676{
677 struct ieee80211_sub_if_data *sdata;
678
679 rcu_read_lock();
680 list_for_each_entry_rcu(sdata, &local->interfaces, list)
681 if (ieee80211_vif_is_mesh(&sdata->vif))
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700682 ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200683 rcu_read_unlock();
684}
685
Johannes Berg902acc72008-02-23 15:17:19 +0100686void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
687{
Johannes Berg472dbc42008-09-11 00:01:49 +0200688 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
Johannes Berg902acc72008-02-23 15:17:19 +0100689
Johannes Berg472dbc42008-09-11 00:01:49 +0200690 INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
691 setup_timer(&ifmsh->housekeeping_timer,
692 ieee80211_mesh_housekeeping_timer,
693 (unsigned long) sdata);
694 skb_queue_head_init(&sdata->u.mesh.skb_queue);
695
696 ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
697 ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
698 ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
699 ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
700 ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
701 ifmsh->mshcfg.auto_open_plinks = true;
702 ifmsh->mshcfg.dot11MeshMaxPeerLinks =
Johannes Berg902acc72008-02-23 15:17:19 +0100703 MESH_MAX_ESTAB_PLINKS;
Johannes Berg472dbc42008-09-11 00:01:49 +0200704 ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100705 MESH_PATH_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200706 ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
Johannes Berg902acc72008-02-23 15:17:19 +0100707 MESH_PREQ_MIN_INT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200708 ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
Johannes Berg902acc72008-02-23 15:17:19 +0100709 MESH_DIAM_TRAVERSAL_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200710 ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
Johannes Berg902acc72008-02-23 15:17:19 +0100711 MESH_MAX_PREQ_RETRIES;
Johannes Berg472dbc42008-09-11 00:01:49 +0200712 ifmsh->mshcfg.path_refresh_time =
Johannes Berg902acc72008-02-23 15:17:19 +0100713 MESH_PATH_REFRESH_TIME;
Johannes Berg472dbc42008-09-11 00:01:49 +0200714 ifmsh->mshcfg.min_discovery_timeout =
Johannes Berg902acc72008-02-23 15:17:19 +0100715 MESH_MIN_DISCOVERY_TIMEOUT;
Johannes Berg472dbc42008-09-11 00:01:49 +0200716 ifmsh->accepting_plinks = true;
717 ifmsh->preq_id = 0;
Rui Paulod19b3bf2009-11-09 23:46:55 +0000718 ifmsh->sn = 0;
Johannes Berg472dbc42008-09-11 00:01:49 +0200719 atomic_set(&ifmsh->mpaths, 0);
Jasper Bryant-Greenef698d852008-08-03 12:04:37 +1200720 mesh_rmc_init(sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200721 ifmsh->last_preq = jiffies;
Johannes Berg902acc72008-02-23 15:17:19 +0100722 /* Allocate all mesh structures when creating the first mesh interface. */
723 if (!mesh_allocated)
724 ieee80211s_init();
Johannes Berg472dbc42008-09-11 00:01:49 +0200725 mesh_ids_set_default(ifmsh);
726 setup_timer(&ifmsh->mesh_path_timer,
Johannes Berg902acc72008-02-23 15:17:19 +0100727 ieee80211_mesh_path_timer,
728 (unsigned long) sdata);
Rui Pauloe304bfd2009-11-09 23:46:56 +0000729 setup_timer(&ifmsh->mesh_path_root_timer,
730 ieee80211_mesh_path_root_timer,
731 (unsigned long) sdata);
Johannes Berg472dbc42008-09-11 00:01:49 +0200732 INIT_LIST_HEAD(&ifmsh->preq_queue.list);
733 spin_lock_init(&ifmsh->mesh_preq_queue_lock);
734}
735
736ieee80211_rx_result
Johannes Bergf1d58c22009-06-17 13:13:00 +0200737ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
Johannes Berg472dbc42008-09-11 00:01:49 +0200738{
739 struct ieee80211_local *local = sdata->local;
740 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
741 struct ieee80211_mgmt *mgmt;
742 u16 fc;
743
744 if (skb->len < 24)
745 return RX_DROP_MONITOR;
746
747 mgmt = (struct ieee80211_mgmt *) skb->data;
748 fc = le16_to_cpu(mgmt->frame_control);
749
750 switch (fc & IEEE80211_FCTL_STYPE) {
Johannes Berga43816d2009-07-10 11:39:26 +0200751 case IEEE80211_STYPE_ACTION:
Johannes Berg472dbc42008-09-11 00:01:49 +0200752 case IEEE80211_STYPE_PROBE_RESP:
753 case IEEE80211_STYPE_BEACON:
Johannes Berg472dbc42008-09-11 00:01:49 +0200754 skb_queue_tail(&ifmsh->skb_queue, skb);
Luis R. Rodriguezc03e20f2009-08-04 15:06:26 -0700755 ieee80211_queue_work(&local->hw, &ifmsh->work);
Johannes Berg472dbc42008-09-11 00:01:49 +0200756 return RX_QUEUED;
757 }
758
759 return RX_CONTINUE;
Johannes Berg902acc72008-02-23 15:17:19 +0100760}