net/mac80211/mesh.c

   1 /*
   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
  11 #include <asm/unaligned.h>
  12 #include "ieee80211_i.h"
  13 #include "mesh.h"
  14
  15 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  16 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  17
  18 #define PP_OFFSET       1               /* Path Selection Protocol */
  19 #define PM_OFFSET       5               /* Path Selection Metric   */
  20 #define CC_OFFSET       9               /* Congestion Control Mode */
  21 #define SP_OFFSET       13              /* Synchronization Protocol */
  22 #define AUTH_OFFSET     17              /* Authentication Protocol */
  23 #define CAPAB_OFFSET    22
  24 #define CAPAB_ACCEPT_PLINKS 0x80
  25 #define CAPAB_FORWARDING    0x10
  26
  27 #define TMR_RUNNING_HK  0
  28 #define TMR_RUNNING_MP  1
  29
  30 int mesh_allocated;
  31 static struct kmem_cache *rm_cache;
  32
  33 void 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
  41 void ieee80211s_stop(void)
  42 {
  43         mesh_pathtbl_unregister();
  44         kmem_cache_destroy(rm_cache);
  45 }
  46
  47 static 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
  53         ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
  54
  55         if (local->quiescing) {
  56                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  57                 return;
  58         }
  59
  60         ieee80211_queue_work(&local->hw, &ifmsh->work);
  61 }
  62
  63 /**
  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
  67  * @sdata: local mesh subif
  68  *
  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  */
  72 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  73 {
  74         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  75
  76         /*
  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          */
  86         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  87                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  88                 memcmp(ifmsh->mesh_pp_id, ie->mesh_config + PP_OFFSET, 4) == 0 &&
  89                 memcmp(ifmsh->mesh_pm_id, ie->mesh_config + PM_OFFSET, 4) == 0 &&
  90                 memcmp(ifmsh->mesh_cc_id, ie->mesh_config + CC_OFFSET, 4) == 0 &&
  91                 memcmp(ifmsh->mesh_sp_id, ie->mesh_config + SP_OFFSET, 4) == 0 &&
  92                 memcmp(ifmsh->mesh_auth_id, ie->mesh_config + AUTH_OFFSET, 4) == 0)
  93                 return true;
  94
  95         return false;
  96 }
  97
  98 /**
  99  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 100  *
 101  * @ie: information elements of a management frame from the mesh peer
 102  */
 103 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 104 {
 105         return (*(ie->mesh_config + CAPAB_OFFSET) & CAPAB_ACCEPT_PLINKS) != 0;
 106 }
 107
 108 /**
 109  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 110  *
 111  * @sdata: mesh interface in which mesh beacons are going to be updated
 112  */
 113 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 114 {
 115         bool free_plinks;
 116
 117         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 118          * the mesh interface might be able to establish plinks with peers that
 119          * are already on the table but are not on PLINK_ESTAB state. However,
 120          * in general the mesh interface is not accepting peer link requests
 121          * from new peers, and that must be reflected in the beacon
 122          */
 123         free_plinks = mesh_plink_availables(sdata);
 124
 125         if (free_plinks != sdata->u.mesh.accepting_plinks)
 126                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 127 }
 128
 129 void mesh_ids_set_default(struct ieee80211_if_mesh *sta)
 130 {
 131         u8 oui[3] = {0x00, 0x0F, 0xAC};
 132
 133         memcpy(sta->mesh_pp_id, oui, sizeof(oui));
 134         memcpy(sta->mesh_pm_id, oui, sizeof(oui));
 135         memcpy(sta->mesh_cc_id, oui, sizeof(oui));
 136         memcpy(sta->mesh_sp_id, oui, sizeof(oui));
 137         memcpy(sta->mesh_auth_id, oui, sizeof(oui));
 138         sta->mesh_pp_id[sizeof(oui)] = 0;
 139         sta->mesh_pm_id[sizeof(oui)] = 0;
 140         sta->mesh_cc_id[sizeof(oui)] = 0xff;
 141         sta->mesh_sp_id[sizeof(oui)] = 0xff;
 142         sta->mesh_auth_id[sizeof(oui)] = 0x0;
 143 }
 144
 145 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 146 {
 147         int i;
 148
 149         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 150         if (!sdata->u.mesh.rmc)
 151                 return -ENOMEM;
 152         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 153         for (i = 0; i < RMC_BUCKETS; i++)
 154                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 155         return 0;
 156 }
 157
 158 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 159 {
 160         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 161         struct rmc_entry *p, *n;
 162         int i;
 163
 164         if (!sdata->u.mesh.rmc)
 165                 return;
 166
 167         for (i = 0; i < RMC_BUCKETS; i++)
 168                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 169                         list_del(&p->list);
 170                         kmem_cache_free(rm_cache, p);
 171                 }
 172
 173         kfree(rmc);
 174         sdata->u.mesh.rmc = NULL;
 175 }
 176
 177 /**
 178  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 179  *
 180  * @sa:         source address
 181  * @mesh_hdr:   mesh_header
 182  *
 183  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 184  *
 185  * Checks using the source address and the mesh sequence number if we have
 186  * received this frame lately. If the frame is not in the cache, it is added to
 187  * it.
 188  */
 189 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 190                    struct ieee80211_sub_if_data *sdata)
 191 {
 192         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 193         u32 seqnum = 0;
 194         int entries = 0;
 195         u8 idx;
 196         struct rmc_entry *p, *n;
 197
 198         /* Don't care about endianness since only match matters */
 199         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 200         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 201         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 202                 ++entries;
 203                 if (time_after(jiffies, p->exp_time) ||
 204                                 (entries == RMC_QUEUE_MAX_LEN)) {
 205                         list_del(&p->list);
 206                         kmem_cache_free(rm_cache, p);
 207                         --entries;
 208                 } else if ((seqnum == p->seqnum)
 209                                 && (memcmp(sa, p->sa, ETH_ALEN) == 0))
 210                         return -1;
 211         }
 212
 213         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 214         if (!p) {
 215                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 216                 return 0;
 217         }
 218         p->seqnum = seqnum;
 219         p->exp_time = jiffies + RMC_TIMEOUT;
 220         memcpy(p->sa, sa, ETH_ALEN);
 221         list_add(&p->list, &rmc->bucket[idx].list);
 222         return 0;
 223 }
 224
 225 void mesh_mgmt_ies_add(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 226 {
 227         struct ieee80211_local *local = sdata->local;
 228         struct ieee80211_supported_band *sband;
 229         u8 *pos;
 230         int len, i, rate;
 231
 232         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 233         len = sband->n_bitrates;
 234         if (len > 8)
 235                 len = 8;
 236         pos = skb_put(skb, len + 2);
 237         *pos++ = WLAN_EID_SUPP_RATES;
 238         *pos++ = len;
 239         for (i = 0; i < len; i++) {
 240                 rate = sband->bitrates[i].bitrate;
 241                 *pos++ = (u8) (rate / 5);
 242         }
 243
 244         if (sband->n_bitrates > len) {
 245                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 246                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 247                 *pos++ = sband->n_bitrates - len;
 248                 for (i = len; i < sband->n_bitrates; i++) {
 249                         rate = sband->bitrates[i].bitrate;
 250                         *pos++ = (u8) (rate / 5);
 251                 }
 252         }
 253
 254         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 255         *pos++ = WLAN_EID_MESH_ID;
 256         *pos++ = sdata->u.mesh.mesh_id_len;
 257         if (sdata->u.mesh.mesh_id_len)
 258                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 259
 260         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
 261         *pos++ = WLAN_EID_MESH_CONFIG;
 262         *pos++ = IEEE80211_MESH_CONFIG_LEN;
 263         /* Version */
 264         *pos++ = 1;
 265
 266         /* Active path selection protocol ID */
 267         memcpy(pos, sdata->u.mesh.mesh_pp_id, 4);
 268         pos += 4;
 269
 270         /* Active path selection metric ID   */
 271         memcpy(pos, sdata->u.mesh.mesh_pm_id, 4);
 272         pos += 4;
 273
 274         /* Congestion control mode identifier */
 275         memcpy(pos, sdata->u.mesh.mesh_cc_id, 4);
 276         pos += 4;
 277
 278         /* Synchronization protocol identifier */
 279         memcpy(pos, sdata->u.mesh.mesh_sp_id, 4);
 280         pos += 4;
 281
 282         /* Authentication Protocol identifier */
 283         memcpy(pos, sdata->u.mesh.mesh_auth_id, 4);
 284         pos += 4;
 285
 286         /* Mesh Formation Info */
 287         memset(pos, 0x00, 1);
 288         pos += 1;
 289
 290         /* Mesh capability */
 291         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 292         *pos = CAPAB_FORWARDING;
 293         *pos++ |= sdata->u.mesh.accepting_plinks ? CAPAB_ACCEPT_PLINKS : 0x00;
 294         *pos++ = 0x00;
 295
 296         return;
 297 }
 298
 299 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 300 {
 301         /* Use last four bytes of hw addr and interface index as hash index */
 302         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 303                 & tbl->hash_mask;
 304 }
 305
 306 struct mesh_table *mesh_table_alloc(int size_order)
 307 {
 308         int i;
 309         struct mesh_table *newtbl;
 310
 311         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 312         if (!newtbl)
 313                 return NULL;
 314
 315         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 316                         (1 << size_order), GFP_KERNEL);
 317
 318         if (!newtbl->hash_buckets) {
 319                 kfree(newtbl);
 320                 return NULL;
 321         }
 322
 323         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 324                         (1 << size_order), GFP_KERNEL);
 325         if (!newtbl->hashwlock) {
 326                 kfree(newtbl->hash_buckets);
 327                 kfree(newtbl);
 328                 return NULL;
 329         }
 330
 331         newtbl->size_order = size_order;
 332         newtbl->hash_mask = (1 << size_order) - 1;
 333         atomic_set(&newtbl->entries,  0);
 334         get_random_bytes(&newtbl->hash_rnd,
 335                         sizeof(newtbl->hash_rnd));
 336         for (i = 0; i <= newtbl->hash_mask; i++)
 337                 spin_lock_init(&newtbl->hashwlock[i]);
 338
 339         return newtbl;
 340 }
 341
 342
 343 static void ieee80211_mesh_path_timer(unsigned long data)
 344 {
 345         struct ieee80211_sub_if_data *sdata =
 346                 (struct ieee80211_sub_if_data *) data;
 347         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 348         struct ieee80211_local *local = sdata->local;
 349
 350         if (local->quiescing) {
 351                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 352                 return;
 353         }
 354
 355         ieee80211_queue_work(&local->hw, &ifmsh->work);
 356 }
 357
 358 /**
 359  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 360  * @hdr:        802.11 frame header
 361  * @fc:         frame control field
 362  * @meshda:     destination address in the mesh
 363  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 364  *              locally originated.
 365  *
 366  * Return the length of the 802.11 (does not include a mesh control header)
 367  */
 368 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
 369                 *meshda, char *meshsa) {
 370         if (is_multicast_ether_addr(meshda)) {
 371                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 372                 /* DA TA SA */
 373                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 374                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 375                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 376                 return 24;
 377         } else {
 378                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 379                                 IEEE80211_FCTL_TODS);
 380                 /* RA TA DA SA */
 381                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 382                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 383                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 384                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 385                 return 30;
 386         }
 387 }
 388
 389 /**
 390  * ieee80211_new_mesh_header - create a new mesh header
 391  * @meshhdr:    uninitialized mesh header
 392  * @sdata:      mesh interface to be used
 393  * @addr4:      addr4 of the mesh frame (1st in ae header)
 394  *              may be NULL
 395  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 396  *              may be NULL unless addr6 is present
 397  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 398  *              may be NULL unless addr5 is present
 399  *
 400  * Return the header length.
 401  */
 402 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 403                 struct ieee80211_sub_if_data *sdata, char *addr4,
 404                 char *addr5, char *addr6)
 405 {
 406         int aelen = 0;
 407         memset(meshhdr, 0, sizeof(meshhdr));
 408         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 409         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 410         sdata->u.mesh.mesh_seqnum++;
 411         if (addr4) {
 412                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 413                 aelen += ETH_ALEN;
 414                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 415         }
 416         if (addr5 && addr6) {
 417                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 418                 aelen += 2 * ETH_ALEN;
 419                 if (!addr4) {
 420                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 421                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 422                 } else {
 423                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 424                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 425                 }
 426         }
 427         return 6 + aelen;
 428 }
 429
 430 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 431                            struct ieee80211_if_mesh *ifmsh)
 432 {
 433         bool free_plinks;
 434
 435 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 436         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 437                sdata->dev->name);
 438 #endif
 439
 440         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 441         mesh_path_expire(sdata);
 442
 443         free_plinks = mesh_plink_availables(sdata);
 444         if (free_plinks != sdata->u.mesh.accepting_plinks)
 445                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 446
 447         mod_timer(&ifmsh->housekeeping_timer,
 448                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 449 }
 450
 451 #ifdef CONFIG_PM
 452 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 453 {
 454         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 455
 456         /* might restart the timer but that doesn't matter */
 457         cancel_work_sync(&ifmsh->work);
 458
 459         /* use atomic bitops in case both timers fire at the same time */
 460
 461         if (del_timer_sync(&ifmsh->housekeeping_timer))
 462                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 463         if (del_timer_sync(&ifmsh->mesh_path_timer))
 464                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 465 }
 466
 467 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 468 {
 469         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 470
 471         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 472                 add_timer(&ifmsh->housekeeping_timer);
 473         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 474                 add_timer(&ifmsh->mesh_path_timer);
 475 }
 476 #endif
 477
 478 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 479 {
 480         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 481         struct ieee80211_local *local = sdata->local;
 482
 483         ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
 484         ieee80211_queue_work(&local->hw, &ifmsh->work);
 485         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 486         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 487                                                 BSS_CHANGED_BEACON_ENABLED |
 488                                                 BSS_CHANGED_BEACON_INT);
 489 }
 490
 491 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 492 {
 493         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 494         /*
 495          * If the timer fired while we waited for it, it will have
 496          * requeued the work. Now the work will be running again
 497          * but will not rearm the timer again because it checks
 498          * whether the interface is running, which, at this point,
 499          * it no longer is.
 500          */
 501         cancel_work_sync(&sdata->u.mesh.work);
 502
 503         /*
 504          * When we get here, the interface is marked down.
 505          * Call synchronize_rcu() to wait for the RX path
 506          * should it be using the interface and enqueuing
 507          * frames at this very time on another CPU.
 508          */
 509         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 510         skb_queue_purge(&sdata->u.mesh.skb_queue);
 511 }
 512
 513 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 514                                         u16 stype,
 515                                         struct ieee80211_mgmt *mgmt,
 516                                         size_t len,
 517                                         struct ieee80211_rx_status *rx_status)
 518 {
 519         struct ieee80211_local *local = sdata->local;
 520         struct ieee802_11_elems elems;
 521         struct ieee80211_channel *channel;
 522         u32 supp_rates = 0;
 523         size_t baselen;
 524         int freq;
 525         enum ieee80211_band band = rx_status->band;
 526
 527         /* ignore ProbeResp to foreign address */
 528         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 529             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 530                 return;
 531
 532         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 533         if (baselen > len)
 534                 return;
 535
 536         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 537                                &elems);
 538
 539         if (elems.ds_params && elems.ds_params_len == 1)
 540                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 541         else
 542                 freq = rx_status->freq;
 543
 544         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 545
 546         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 547                 return;
 548
 549         if (elems.mesh_id && elems.mesh_config &&
 550             mesh_matches_local(&elems, sdata)) {
 551                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 552
 553                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 554                                       mesh_peer_accepts_plinks(&elems));
 555         }
 556 }
 557
 558 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 559                                           struct ieee80211_mgmt *mgmt,
 560                                           size_t len,
 561                                           struct ieee80211_rx_status *rx_status)
 562 {
 563         switch (mgmt->u.action.category) {
 564         case PLINK_CATEGORY:
 565                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 566                 break;
 567         case MESH_PATH_SEL_CATEGORY:
 568                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 569                 break;
 570         }
 571 }
 572
 573 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 574                                           struct sk_buff *skb)
 575 {
 576         struct ieee80211_rx_status *rx_status;
 577         struct ieee80211_if_mesh *ifmsh;
 578         struct ieee80211_mgmt *mgmt;
 579         u16 stype;
 580
 581         ifmsh = &sdata->u.mesh;
 582
 583         rx_status = IEEE80211_SKB_RXCB(skb);
 584         mgmt = (struct ieee80211_mgmt *) skb->data;
 585         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 586
 587         switch (stype) {
 588         case IEEE80211_STYPE_PROBE_RESP:
 589         case IEEE80211_STYPE_BEACON:
 590                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 591                                             rx_status);
 592                 break;
 593         case IEEE80211_STYPE_ACTION:
 594                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 595                 break;
 596         }
 597
 598         kfree_skb(skb);
 599 }
 600
 601 static void ieee80211_mesh_work(struct work_struct *work)
 602 {
 603         struct ieee80211_sub_if_data *sdata =
 604                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 605         struct ieee80211_local *local = sdata->local;
 606         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 607         struct sk_buff *skb;
 608
 609         if (!netif_running(sdata->dev))
 610                 return;
 611
 612         if (local->scanning)
 613                 return;
 614
 615         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 616                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 617
 618         if (ifmsh->preq_queue_len &&
 619             time_after(jiffies,
 620                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 621                 mesh_path_start_discovery(sdata);
 622
 623         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 624                 mesh_mpath_table_grow();
 625
 626         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 627                 mesh_mpp_table_grow();
 628
 629         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 630                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 631 }
 632
 633 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 634 {
 635         struct ieee80211_sub_if_data *sdata;
 636
 637         rcu_read_lock();
 638         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 639                 if (ieee80211_vif_is_mesh(&sdata->vif))
 640                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
 641         rcu_read_unlock();
 642 }
 643
 644 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 645 {
 646         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 647
 648         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 649         setup_timer(&ifmsh->housekeeping_timer,
 650                     ieee80211_mesh_housekeeping_timer,
 651                     (unsigned long) sdata);
 652         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 653
 654         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 655         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 656         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 657         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 658         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 659         ifmsh->mshcfg.auto_open_plinks = true;
 660         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 661                 MESH_MAX_ESTAB_PLINKS;
 662         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 663                 MESH_PATH_TIMEOUT;
 664         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 665                 MESH_PREQ_MIN_INT;
 666         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 667                 MESH_DIAM_TRAVERSAL_TIME;
 668         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 669                 MESH_MAX_PREQ_RETRIES;
 670         ifmsh->mshcfg.path_refresh_time =
 671                 MESH_PATH_REFRESH_TIME;
 672         ifmsh->mshcfg.min_discovery_timeout =
 673                 MESH_MIN_DISCOVERY_TIMEOUT;
 674         ifmsh->accepting_plinks = true;
 675         ifmsh->preq_id = 0;
 676         ifmsh->dsn = 0;
 677         atomic_set(&ifmsh->mpaths, 0);
 678         mesh_rmc_init(sdata);
 679         ifmsh->last_preq = jiffies;
 680         /* Allocate all mesh structures when creating the first mesh interface. */
 681         if (!mesh_allocated)
 682                 ieee80211s_init();
 683         mesh_ids_set_default(ifmsh);
 684         setup_timer(&ifmsh->mesh_path_timer,
 685                     ieee80211_mesh_path_timer,
 686                     (unsigned long) sdata);
 687         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 688         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 689 }
 690
 691 ieee80211_rx_result
 692 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 693 {
 694         struct ieee80211_local *local = sdata->local;
 695         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 696         struct ieee80211_mgmt *mgmt;
 697         u16 fc;
 698
 699         if (skb->len < 24)
 700                 return RX_DROP_MONITOR;
 701
 702         mgmt = (struct ieee80211_mgmt *) skb->data;
 703         fc = le16_to_cpu(mgmt->frame_control);
 704
 705         switch (fc & IEEE80211_FCTL_STYPE) {
 706         case IEEE80211_STYPE_ACTION:
 707                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
 708                         return RX_DROP_MONITOR;
 709                 /* fall through */
 710         case IEEE80211_STYPE_PROBE_RESP:
 711         case IEEE80211_STYPE_BEACON:
 712                 skb_queue_tail(&ifmsh->skb_queue, skb);
 713                 ieee80211_queue_work(&local->hw, &ifmsh->work);
 714                 return RX_QUEUED;
 715         }
 716
 717         return RX_CONTINUE;
 718 }