2 * Copyright (c) 2008 open80211s Ltd.
3 * Authors: Luis Carlos Cobo <luisca@cozybit.com>
4 * Javier Cardona <javier@cozybit.com>
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.
11 #include "ieee80211_i.h"
14 #define PP_OFFSET 1 /* Path Selection Protocol */
15 #define PM_OFFSET 5 /* Path Selection Metric */
16 #define CC_OFFSET 9 /* Congestion Control Mode */
17 #define CAPAB_OFFSET 17
18 #define ACCEPT_PLINKS 0x80
21 static struct kmem_cache *rm_cache;
23 void ieee80211s_init(void)
27 rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
31 void ieee80211s_stop(void)
33 mesh_pathtbl_unregister();
34 kmem_cache_destroy(rm_cache);
38 * mesh_matches_local - check if the config of a mesh point matches ours
40 * @ie: information elements of a management frame from the mesh peer
41 * @dev: local mesh interface
43 * This function checks if the mesh configuration of a mesh point matches the
44 * local mesh configuration, i.e. if both nodes belong to the same mesh network.
46 bool mesh_matches_local(struct ieee802_11_elems *ie, struct net_device *dev)
48 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
49 struct ieee80211_if_sta *sta = &sdata->u.sta;
51 if (sta->mesh_id_len == ie->mesh_id_len &&
52 memcmp(sta->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
53 memcmp(sta->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
54 memcmp(sta->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
55 memcmp(sta->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0)
57 * As support for each feature is added, check for matching
58 * - On mesh config capabilities
59 * - Power Save Support En
60 * - Sync support enabled
61 * - Sync support active
62 * - Sync support required from peer
64 * - Power management control on fc
72 * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
74 * @ie: information elements of a management frame from the mesh peer
75 * @dev: local mesh interface
77 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie,
78 struct net_device *dev)
80 return (*(ie->mesh_config + CAPAB_OFFSET) & ACCEPT_PLINKS) != 0;
84 * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
86 * @dev: mesh interface in which mesh beacons are going to be updated
88 void mesh_accept_plinks_update(struct net_device *dev)
90 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
93 /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
94 * the mesh interface might be able to establish plinks with peers that
95 * are already on the table but are not on ESTAB state. However, in
96 * general the mesh interface is not accepting peer link requests from
97 * new peers, and that must be reflected in the beacon
99 free_plinks = mesh_plink_availables(sdata);
101 if (free_plinks != sdata->u.sta.accepting_plinks)
102 ieee80211_sta_timer((unsigned long) sdata);
105 void mesh_ids_set_default(struct ieee80211_if_sta *sta)
107 u8 def_id[4] = {0x00, 0x0F, 0xAC, 0xff};
109 memcpy(sta->mesh_pp_id, def_id, 4);
110 memcpy(sta->mesh_pm_id, def_id, 4);
111 memcpy(sta->mesh_cc_id, def_id, 4);
114 int mesh_rmc_init(struct net_device *dev)
116 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
119 sdata->u.sta.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
120 if (!sdata->u.sta.rmc)
122 sdata->u.sta.rmc->idx_mask = RMC_BUCKETS - 1;
123 for (i = 0; i < RMC_BUCKETS; i++)
124 INIT_LIST_HEAD(&sdata->u.sta.rmc->bucket[i].list);
128 void mesh_rmc_free(struct net_device *dev)
130 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
131 struct mesh_rmc *rmc = sdata->u.sta.rmc;
132 struct rmc_entry *p, *n;
135 if (!sdata->u.sta.rmc)
138 for (i = 0; i < RMC_BUCKETS; i++)
139 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
141 kmem_cache_free(rm_cache, p);
145 sdata->u.sta.rmc = NULL;
149 * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
151 * @sa: source address
152 * @mesh_hdr: mesh_header
154 * Returns: 0 if the frame is not in the cache, nonzero otherwise.
156 * Checks using the source address and the mesh sequence number if we have
157 * received this frame lately. If the frame is not in the cache, it is added to
160 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
161 struct net_device *dev)
163 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
164 struct mesh_rmc *rmc = sdata->u.sta.rmc;
168 struct rmc_entry *p, *n;
170 /* Don't care about endianness since only match matters */
171 memcpy(&seqnum, mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
172 idx = mesh_hdr->seqnum[0] & rmc->idx_mask;
173 list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
175 if (time_after(jiffies, p->exp_time) ||
176 (entries == RMC_QUEUE_MAX_LEN)) {
178 kmem_cache_free(rm_cache, p);
180 } else if ((seqnum == p->seqnum)
181 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
185 p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
187 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
191 p->exp_time = jiffies + RMC_TIMEOUT;
192 memcpy(p->sa, sa, ETH_ALEN);
193 list_add(&p->list, &rmc->bucket[idx].list);
197 void mesh_mgmt_ies_add(struct sk_buff *skb, struct net_device *dev)
199 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
200 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
201 struct ieee80211_supported_band *sband;
205 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
206 len = sband->n_bitrates;
209 pos = skb_put(skb, len + 2);
210 *pos++ = WLAN_EID_SUPP_RATES;
212 for (i = 0; i < len; i++) {
213 rate = sband->bitrates[i].bitrate;
214 *pos++ = (u8) (rate / 5);
217 if (sband->n_bitrates > len) {
218 pos = skb_put(skb, sband->n_bitrates - len + 2);
219 *pos++ = WLAN_EID_EXT_SUPP_RATES;
220 *pos++ = sband->n_bitrates - len;
221 for (i = len; i < sband->n_bitrates; i++) {
222 rate = sband->bitrates[i].bitrate;
223 *pos++ = (u8) (rate / 5);
227 pos = skb_put(skb, 2 + sdata->u.sta.mesh_id_len);
228 *pos++ = WLAN_EID_MESH_ID;
229 *pos++ = sdata->u.sta.mesh_id_len;
230 if (sdata->u.sta.mesh_id_len)
231 memcpy(pos, sdata->u.sta.mesh_id, sdata->u.sta.mesh_id_len);
233 pos = skb_put(skb, 21);
234 *pos++ = WLAN_EID_MESH_CONFIG;
235 *pos++ = MESH_CFG_LEN;
239 /* Active path selection protocol ID */
240 memcpy(pos, sdata->u.sta.mesh_pp_id, 4);
243 /* Active path selection metric ID */
244 memcpy(pos, sdata->u.sta.mesh_pm_id, 4);
247 /* Congestion control mode identifier */
248 memcpy(pos, sdata->u.sta.mesh_cc_id, 4);
251 /* Channel precedence:
252 * Not running simple channel unification protocol
254 memset(pos, 0x00, 4);
257 /* Mesh capability */
258 sdata->u.sta.accepting_plinks = mesh_plink_availables(sdata);
259 *pos++ = sdata->u.sta.accepting_plinks ? ACCEPT_PLINKS : 0x00;
265 u32 mesh_table_hash(u8 *addr, struct net_device *dev, struct mesh_table *tbl)
267 /* Use last four bytes of hw addr and interface index as hash index */
268 return jhash_2words(*(u32 *)(addr+2), dev->ifindex, tbl->hash_rnd)
272 u8 mesh_id_hash(u8 *mesh_id, int mesh_id_len)
276 else if (mesh_id_len == 1)
277 return (u8) mesh_id[0];
279 return (u8) (mesh_id[0] + 2 * mesh_id[1]);
282 struct mesh_table *mesh_table_alloc(int size_order)
285 struct mesh_table *newtbl;
287 newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
291 newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
292 (1 << size_order), GFP_KERNEL);
294 if (!newtbl->hash_buckets) {
299 newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
300 (1 << size_order), GFP_KERNEL);
301 if (!newtbl->hashwlock) {
302 kfree(newtbl->hash_buckets);
307 newtbl->size_order = size_order;
308 newtbl->hash_mask = (1 << size_order) - 1;
309 atomic_set(&newtbl->entries, 0);
310 get_random_bytes(&newtbl->hash_rnd,
311 sizeof(newtbl->hash_rnd));
312 for (i = 0; i <= newtbl->hash_mask; i++)
313 spin_lock_init(&newtbl->hashwlock[i]);
318 void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
320 struct hlist_head *mesh_hash;
321 struct hlist_node *p, *q;
324 mesh_hash = tbl->hash_buckets;
325 for (i = 0; i <= tbl->hash_mask; i++) {
326 spin_lock(&tbl->hashwlock[i]);
327 hlist_for_each_safe(p, q, &mesh_hash[i]) {
328 tbl->free_node(p, free_leafs);
329 atomic_dec(&tbl->entries);
331 spin_unlock(&tbl->hashwlock[i]);
333 kfree(tbl->hash_buckets);
334 kfree(tbl->hashwlock);
338 static void ieee80211_mesh_path_timer(unsigned long data)
340 struct ieee80211_sub_if_data *sdata =
341 (struct ieee80211_sub_if_data *) data;
342 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
343 struct ieee80211_local *local = wdev_priv(&sdata->wdev);
345 queue_work(local->hw.workqueue, &ifsta->work);
348 struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
350 struct mesh_table *newtbl;
351 struct hlist_head *oldhash;
352 struct hlist_node *p;
356 if (atomic_read(&tbl->entries)
357 < tbl->mean_chain_len * (tbl->hash_mask + 1)) {
362 newtbl = mesh_table_alloc(tbl->size_order + 1);
368 newtbl->free_node = tbl->free_node;
369 newtbl->mean_chain_len = tbl->mean_chain_len;
370 newtbl->copy_node = tbl->copy_node;
371 atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
373 oldhash = tbl->hash_buckets;
374 for (i = 0; i <= tbl->hash_mask; i++)
375 hlist_for_each(p, &oldhash[i])
376 tbl->copy_node(p, newtbl);