SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 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         u8 neighbors;
 227
 228         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 229         len = sband->n_bitrates;
 230         if (len > 8)
 231                 len = 8;
 232         pos = skb_put(skb, len + 2);
 233         *pos++ = WLAN_EID_SUPP_RATES;
 234         *pos++ = len;
 235         for (i = 0; i < len; i++) {
 236                 rate = sband->bitrates[i].bitrate;
 237                 *pos++ = (u8) (rate / 5);
 238         }
 239
 240         if (sband->n_bitrates > len) {
 241                 pos = skb_put(skb, sband->n_bitrates - len + 2);
 242                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 243                 *pos++ = sband->n_bitrates - len;
 244                 for (i = len; i < sband->n_bitrates; i++) {
 245                         rate = sband->bitrates[i].bitrate;
 246                         *pos++ = (u8) (rate / 5);
 247                 }
 248         }
 249
 250         pos = skb_put(skb, 2 + sdata->u.mesh.mesh_id_len);
 251         *pos++ = WLAN_EID_MESH_ID;
 252         *pos++ = sdata->u.mesh.mesh_id_len;
 253         if (sdata->u.mesh.mesh_id_len)
 254                 memcpy(pos, sdata->u.mesh.mesh_id, sdata->u.mesh.mesh_id_len);
 255
 256         pos = skb_put(skb, 2 + IEEE80211_MESH_CONFIG_LEN);
 257         *pos++ = WLAN_EID_MESH_CONFIG;
 258         *pos++ = IEEE80211_MESH_CONFIG_LEN;
 259
 260         /* Active path selection protocol ID */
 261         *pos++ = sdata->u.mesh.mesh_pp_id;
 262
 263         /* Active path selection metric ID   */
 264         *pos++ = sdata->u.mesh.mesh_pm_id;
 265
 266         /* Congestion control mode identifier */
 267         *pos++ = sdata->u.mesh.mesh_cc_id;
 268
 269         /* Synchronization protocol identifier */
 270         *pos++ = sdata->u.mesh.mesh_sp_id;
 271
 272         /* Authentication Protocol identifier */
 273         *pos++ = sdata->u.mesh.mesh_auth_id;
 274
 275         /* Mesh Formation Info - number of neighbors */
 276         neighbors = atomic_read(&sdata->u.mesh.mshstats.estab_plinks);
 277         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 278         neighbors = (neighbors > 15) ? 15 : neighbors;
 279         *pos++ = neighbors << 1;
 280
 281         /* Mesh capability */
 282         sdata->u.mesh.accepting_plinks = mesh_plink_availables(sdata);
 283         *pos = MESHCONF_CAPAB_FORWARDING;
 284         *pos++ |= sdata->u.mesh.accepting_plinks ?
 285             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 286         *pos++ = 0x00;
 287
 288         return;
 289 }
 290
 291 u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, struct mesh_table *tbl)
 292 {
 293         /* Use last four bytes of hw addr and interface index as hash index */
 294         return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd)
 295                 & tbl->hash_mask;
 296 }
 297
 298 struct mesh_table *mesh_table_alloc(int size_order)
 299 {
 300         int i;
 301         struct mesh_table *newtbl;
 302
 303         newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL);
 304         if (!newtbl)
 305                 return NULL;
 306
 307         newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) *
 308                         (1 << size_order), GFP_KERNEL);
 309
 310         if (!newtbl->hash_buckets) {
 311                 kfree(newtbl);
 312                 return NULL;
 313         }
 314
 315         newtbl->hashwlock = kmalloc(sizeof(spinlock_t) *
 316                         (1 << size_order), GFP_KERNEL);
 317         if (!newtbl->hashwlock) {
 318                 kfree(newtbl->hash_buckets);
 319                 kfree(newtbl);
 320                 return NULL;
 321         }
 322
 323         newtbl->size_order = size_order;
 324         newtbl->hash_mask = (1 << size_order) - 1;
 325         atomic_set(&newtbl->entries,  0);
 326         get_random_bytes(&newtbl->hash_rnd,
 327                         sizeof(newtbl->hash_rnd));
 328         for (i = 0; i <= newtbl->hash_mask; i++)
 329                 spin_lock_init(&newtbl->hashwlock[i]);
 330
 331         return newtbl;
 332 }
 333
 334
 335 static void ieee80211_mesh_path_timer(unsigned long data)
 336 {
 337         struct ieee80211_sub_if_data *sdata =
 338                 (struct ieee80211_sub_if_data *) data;
 339         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 340         struct ieee80211_local *local = sdata->local;
 341
 342         if (local->quiescing) {
 343                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 344                 return;
 345         }
 346
 347         ieee80211_queue_work(&local->hw, &ifmsh->work);
 348 }
 349
 350 /**
 351  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 352  * @hdr:        802.11 frame header
 353  * @fc:         frame control field
 354  * @meshda:     destination address in the mesh
 355  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 356  *              locally originated.
 357  *
 358  * Return the length of the 802.11 (does not include a mesh control header)
 359  */
 360 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc, char
 361                 *meshda, char *meshsa) {
 362         if (is_multicast_ether_addr(meshda)) {
 363                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 364                 /* DA TA SA */
 365                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 366                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 367                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 368                 return 24;
 369         } else {
 370                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 371                                 IEEE80211_FCTL_TODS);
 372                 /* RA TA DA SA */
 373                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 374                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 375                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 376                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 377                 return 30;
 378         }
 379 }
 380
 381 /**
 382  * ieee80211_new_mesh_header - create a new mesh header
 383  * @meshhdr:    uninitialized mesh header
 384  * @sdata:      mesh interface to be used
 385  * @addr4:      addr4 of the mesh frame (1st in ae header)
 386  *              may be NULL
 387  * @addr5:      addr5 of the mesh frame (1st or 2nd in ae header)
 388  *              may be NULL unless addr6 is present
 389  * @addr6:      addr6 of the mesh frame (2nd or 3rd in ae header)
 390  *              may be NULL unless addr5 is present
 391  *
 392  * Return the header length.
 393  */
 394 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 395                 struct ieee80211_sub_if_data *sdata, char *addr4,
 396                 char *addr5, char *addr6)
 397 {
 398         int aelen = 0;
 399         memset(meshhdr, 0, sizeof(meshhdr));
 400         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 401         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 402         sdata->u.mesh.mesh_seqnum++;
 403         if (addr4) {
 404                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 405                 aelen += ETH_ALEN;
 406                 memcpy(meshhdr->eaddr1, addr4, ETH_ALEN);
 407         }
 408         if (addr5 && addr6) {
 409                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 410                 aelen += 2 * ETH_ALEN;
 411                 if (!addr4) {
 412                         memcpy(meshhdr->eaddr1, addr5, ETH_ALEN);
 413                         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 414                 } else {
 415                         memcpy(meshhdr->eaddr2, addr5, ETH_ALEN);
 416                         memcpy(meshhdr->eaddr3, addr6, ETH_ALEN);
 417                 }
 418         }
 419         return 6 + aelen;
 420 }
 421
 422 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 423                            struct ieee80211_if_mesh *ifmsh)
 424 {
 425         bool free_plinks;
 426
 427 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 428         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 429                sdata->dev->name);
 430 #endif
 431
 432         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 433         mesh_path_expire(sdata);
 434
 435         free_plinks = mesh_plink_availables(sdata);
 436         if (free_plinks != sdata->u.mesh.accepting_plinks)
 437                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 438
 439         mod_timer(&ifmsh->housekeeping_timer,
 440                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 441 }
 442
 443 #ifdef CONFIG_PM
 444 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 445 {
 446         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 447
 448         /* might restart the timer but that doesn't matter */
 449         cancel_work_sync(&ifmsh->work);
 450
 451         /* use atomic bitops in case both timers fire at the same time */
 452
 453         if (del_timer_sync(&ifmsh->housekeeping_timer))
 454                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 455         if (del_timer_sync(&ifmsh->mesh_path_timer))
 456                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 457 }
 458
 459 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 460 {
 461         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 462
 463         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 464                 add_timer(&ifmsh->housekeeping_timer);
 465         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 466                 add_timer(&ifmsh->mesh_path_timer);
 467 }
 468 #endif
 469
 470 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 471 {
 472         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 473         struct ieee80211_local *local = sdata->local;
 474
 475         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 476         ieee80211_queue_work(&local->hw, &ifmsh->work);
 477         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 478         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 479                                                 BSS_CHANGED_BEACON_ENABLED |
 480                                                 BSS_CHANGED_BEACON_INT);
 481 }
 482
 483 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 484 {
 485         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 486         /*
 487          * If the timer fired while we waited for it, it will have
 488          * requeued the work. Now the work will be running again
 489          * but will not rearm the timer again because it checks
 490          * whether the interface is running, which, at this point,
 491          * it no longer is.
 492          */
 493         cancel_work_sync(&sdata->u.mesh.work);
 494
 495         /*
 496          * When we get here, the interface is marked down.
 497          * Call synchronize_rcu() to wait for the RX path
 498          * should it be using the interface and enqueuing
 499          * frames at this very time on another CPU.
 500          */
 501         rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 502         skb_queue_purge(&sdata->u.mesh.skb_queue);
 503 }
 504
 505 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 506                                         u16 stype,
 507                                         struct ieee80211_mgmt *mgmt,
 508                                         size_t len,
 509                                         struct ieee80211_rx_status *rx_status)
 510 {
 511         struct ieee80211_local *local = sdata->local;
 512         struct ieee802_11_elems elems;
 513         struct ieee80211_channel *channel;
 514         u32 supp_rates = 0;
 515         size_t baselen;
 516         int freq;
 517         enum ieee80211_band band = rx_status->band;
 518
 519         /* ignore ProbeResp to foreign address */
 520         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 521             compare_ether_addr(mgmt->da, sdata->dev->dev_addr))
 522                 return;
 523
 524         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 525         if (baselen > len)
 526                 return;
 527
 528         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 529                                &elems);
 530
 531         if (elems.ds_params && elems.ds_params_len == 1)
 532                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 533         else
 534                 freq = rx_status->freq;
 535
 536         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 537
 538         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 539                 return;
 540
 541         if (elems.mesh_id && elems.mesh_config &&
 542             mesh_matches_local(&elems, sdata)) {
 543                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 544
 545                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata,
 546                                       mesh_peer_accepts_plinks(&elems));
 547         }
 548 }
 549
 550 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 551                                           struct ieee80211_mgmt *mgmt,
 552                                           size_t len,
 553                                           struct ieee80211_rx_status *rx_status)
 554 {
 555         switch (mgmt->u.action.category) {
 556         case MESH_PLINK_CATEGORY:
 557                 mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 558                 break;
 559         case MESH_PATH_SEL_CATEGORY:
 560                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 561                 break;
 562         }
 563 }
 564
 565 static void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 566                                           struct sk_buff *skb)
 567 {
 568         struct ieee80211_rx_status *rx_status;
 569         struct ieee80211_if_mesh *ifmsh;
 570         struct ieee80211_mgmt *mgmt;
 571         u16 stype;
 572
 573         ifmsh = &sdata->u.mesh;
 574
 575         rx_status = IEEE80211_SKB_RXCB(skb);
 576         mgmt = (struct ieee80211_mgmt *) skb->data;
 577         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 578
 579         switch (stype) {
 580         case IEEE80211_STYPE_PROBE_RESP:
 581         case IEEE80211_STYPE_BEACON:
 582                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 583                                             rx_status);
 584                 break;
 585         case IEEE80211_STYPE_ACTION:
 586                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 587                 break;
 588         }
 589
 590         kfree_skb(skb);
 591 }
 592
 593 static void ieee80211_mesh_work(struct work_struct *work)
 594 {
 595         struct ieee80211_sub_if_data *sdata =
 596                 container_of(work, struct ieee80211_sub_if_data, u.mesh.work);
 597         struct ieee80211_local *local = sdata->local;
 598         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 599         struct sk_buff *skb;
 600
 601         if (!netif_running(sdata->dev))
 602                 return;
 603
 604         if (local->scanning)
 605                 return;
 606
 607         while ((skb = skb_dequeue(&ifmsh->skb_queue)))
 608                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 609
 610         if (ifmsh->preq_queue_len &&
 611             time_after(jiffies,
 612                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 613                 mesh_path_start_discovery(sdata);
 614
 615         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 616                 mesh_mpath_table_grow();
 617
 618         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 619                 mesh_mpp_table_grow();
 620
 621         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 622                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 623 }
 624
 625 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 626 {
 627         struct ieee80211_sub_if_data *sdata;
 628
 629         rcu_read_lock();
 630         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 631                 if (ieee80211_vif_is_mesh(&sdata->vif))
 632                         ieee80211_queue_work(&local->hw, &sdata->u.mesh.work);
 633         rcu_read_unlock();
 634 }
 635
 636 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 637 {
 638         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 639
 640         INIT_WORK(&ifmsh->work, ieee80211_mesh_work);
 641         setup_timer(&ifmsh->housekeeping_timer,
 642                     ieee80211_mesh_housekeeping_timer,
 643                     (unsigned long) sdata);
 644         skb_queue_head_init(&sdata->u.mesh.skb_queue);
 645
 646         ifmsh->mshcfg.dot11MeshRetryTimeout = MESH_RET_T;
 647         ifmsh->mshcfg.dot11MeshConfirmTimeout = MESH_CONF_T;
 648         ifmsh->mshcfg.dot11MeshHoldingTimeout = MESH_HOLD_T;
 649         ifmsh->mshcfg.dot11MeshMaxRetries = MESH_MAX_RETR;
 650         ifmsh->mshcfg.dot11MeshTTL = MESH_TTL;
 651         ifmsh->mshcfg.auto_open_plinks = true;
 652         ifmsh->mshcfg.dot11MeshMaxPeerLinks =
 653                 MESH_MAX_ESTAB_PLINKS;
 654         ifmsh->mshcfg.dot11MeshHWMPactivePathTimeout =
 655                 MESH_PATH_TIMEOUT;
 656         ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval =
 657                 MESH_PREQ_MIN_INT;
 658         ifmsh->mshcfg.dot11MeshHWMPnetDiameterTraversalTime =
 659                 MESH_DIAM_TRAVERSAL_TIME;
 660         ifmsh->mshcfg.dot11MeshHWMPmaxPREQretries =
 661                 MESH_MAX_PREQ_RETRIES;
 662         ifmsh->mshcfg.path_refresh_time =
 663                 MESH_PATH_REFRESH_TIME;
 664         ifmsh->mshcfg.min_discovery_timeout =
 665                 MESH_MIN_DISCOVERY_TIMEOUT;
 666         ifmsh->accepting_plinks = true;
 667         ifmsh->preq_id = 0;
 668         ifmsh->dsn = 0;
 669         atomic_set(&ifmsh->mpaths, 0);
 670         mesh_rmc_init(sdata);
 671         ifmsh->last_preq = jiffies;
 672         /* Allocate all mesh structures when creating the first mesh interface. */
 673         if (!mesh_allocated)
 674                 ieee80211s_init();
 675         mesh_ids_set_default(ifmsh);
 676         setup_timer(&ifmsh->mesh_path_timer,
 677                     ieee80211_mesh_path_timer,
 678                     (unsigned long) sdata);
 679         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 680         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 681 }
 682
 683 ieee80211_rx_result
 684 ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 685 {
 686         struct ieee80211_local *local = sdata->local;
 687         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 688         struct ieee80211_mgmt *mgmt;
 689         u16 fc;
 690
 691         if (skb->len < 24)
 692                 return RX_DROP_MONITOR;
 693
 694         mgmt = (struct ieee80211_mgmt *) skb->data;
 695         fc = le16_to_cpu(mgmt->frame_control);
 696
 697         switch (fc & IEEE80211_FCTL_STYPE) {
 698         case IEEE80211_STYPE_ACTION:
 699                 if (skb->len < IEEE80211_MIN_ACTION_SIZE)
 700                         return RX_DROP_MONITOR;
 701                 /* fall through */
 702         case IEEE80211_STYPE_PROBE_RESP:
 703         case IEEE80211_STYPE_BEACON:
 704                 skb_queue_tail(&ifmsh->skb_queue, skb);
 705                 ieee80211_queue_work(&local->hw, &ifmsh->work);
 706                 return RX_QUEUED;
 707         }
 708
 709         return RX_CONTINUE;
 710 }