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