net/mac80211/mesh.c

   1 /*
   2  * Copyright (c) 2008, 2009 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 <linux/slab.h>
  12 #include <asm/unaligned.h>
  13 #include "ieee80211_i.h"
  14 #include "mesh.h"
  15
  16 #define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
  17 #define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
  18 #define IEEE80211_MESH_RANN_INTERVAL         (1 * HZ)
  19
  20 #define MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
  21 #define MESHCONF_CAPAB_FORWARDING    0x08
  22
  23 #define TMR_RUNNING_HK  0
  24 #define TMR_RUNNING_MP  1
  25 #define TMR_RUNNING_MPR 2
  26
  27 int mesh_allocated;
  28 static struct kmem_cache *rm_cache;
  29
  30 void ieee80211s_init(void)
  31 {
  32         mesh_pathtbl_init();
  33         mesh_allocated = 1;
  34         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  35                                      0, 0, NULL);
  36 }
  37
  38 void ieee80211s_stop(void)
  39 {
  40         mesh_pathtbl_unregister();
  41         kmem_cache_destroy(rm_cache);
  42 }
  43
  44 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  45 {
  46         struct ieee80211_sub_if_data *sdata = (void *) data;
  47         struct ieee80211_local *local = sdata->local;
  48         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  49
  50         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  51
  52         if (local->quiescing) {
  53                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  54                 return;
  55         }
  56
  57         ieee80211_queue_work(&local->hw, &sdata->work);
  58 }
  59
  60 /**
  61  * mesh_matches_local - check if the config of a mesh point matches ours
  62  *
  63  * @ie: information elements of a management frame from the mesh peer
  64  * @sdata: local mesh subif
  65  *
  66  * This function checks if the mesh configuration of a mesh point matches the
  67  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  68  */
  69 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  70 {
  71         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  72
  73         /*
  74          * As support for each feature is added, check for matching
  75          * - On mesh config capabilities
  76          *   - Power Save Support En
  77          *   - Sync support enabled
  78          *   - Sync support active
  79          *   - Sync support required from peer
  80          *   - MDA enabled
  81          * - Power management control on fc
  82          */
  83         if (ifmsh->mesh_id_len == ie->mesh_id_len &&
  84                 memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  85                 (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  86                 (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  87                 (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  88                 (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  89                 (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth))
  90                 return true;
  91
  92         return false;
  93 }
  94
  95 /**
  96  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  97  *
  98  * @ie: information elements of a management frame from the mesh peer
  99  */
 100 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 101 {
 102         return (ie->mesh_config->meshconf_cap &
 103             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 104 }
 105
 106 /**
 107  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 108  *
 109  * @sdata: mesh interface in which mesh beacons are going to be updated
 110  */
 111 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 112 {
 113         bool free_plinks;
 114
 115         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 116          * the mesh interface might be able to establish plinks with peers that
 117          * are already on the table but are not on PLINK_ESTAB state. However,
 118          * in general the mesh interface is not accepting peer link requests
 119          * from new peers, and that must be reflected in the beacon
 120          */
 121         free_plinks = mesh_plink_availables(sdata);
 122
 123         if (free_plinks != sdata->u.mesh.accepting_plinks)
 124                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 125 }
 126
 127 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 128 {
 129         int i;
 130
 131         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 132         if (!sdata->u.mesh.rmc)
 133                 return -ENOMEM;
 134         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 135         for (i = 0; i < RMC_BUCKETS; i++)
 136                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 137         return 0;
 138 }
 139
 140 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 141 {
 142         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 143         struct rmc_entry *p, *n;
 144         int i;
 145
 146         if (!sdata->u.mesh.rmc)
 147                 return;
 148
 149         for (i = 0; i < RMC_BUCKETS; i++)
 150                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 151                         list_del(&p->list);
 152                         kmem_cache_free(rm_cache, p);
 153                 }
 154
 155         kfree(rmc);
 156         sdata->u.mesh.rmc = NULL;
 157 }
 158
 159 /**
 160  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 161  *
 162  * @sa:         source address
 163  * @mesh_hdr:   mesh_header
 164  *
 165  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 166  *
 167  * Checks using the source address and the mesh sequence number if we have
 168  * received this frame lately. If the frame is not in the cache, it is added to
 169  * it.
 170  */
 171 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 172                    struct ieee80211_sub_if_data *sdata)
 173 {
 174         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 175         u32 seqnum = 0;
 176         int entries = 0;
 177         u8 idx;
 178         struct rmc_entry *p, *n;
 179
 180         /* Don't care about endianness since only match matters */
 181         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 182         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 183         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 184                 ++entries;
 185                 if (time_after(jiffies, p->exp_time) ||
 186                                 (entries == RMC_QUEUE_MAX_LEN)) {
 187                         list_del(&p->list);
 188                         kmem_cache_free(rm_cache, p);
 189                         --entries;
 190                 } else if ((seqnum == p->seqnum) &&
 191                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
 192                         return -1;
 193         }
 194
 195         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 196         if (!p) {
 197                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 198                 return 0;
 199         }
 200         p->seqnum = seqnum;
 201         p->exp_time = jiffies + RMC_TIMEOUT;
 202         memcpy(p->sa, sa, ETH_ALEN);
 203         list_add(&p->list, &rmc->bucket[idx].list);
 204         return 0;
 205 }
 206
 207 int
 208 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 209 {
 210         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 211         u8 *pos, neighbors;
 212         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 213
 214         if (skb_tailroom(skb) < 2 + meshconf_len)
 215                 return -ENOMEM;
 216
 217         pos = skb_put(skb, 2 + meshconf_len);
 218         *pos++ = WLAN_EID_MESH_CONFIG;
 219         *pos++ = meshconf_len;
 220
 221         /* Active path selection protocol ID */
 222         *pos++ = ifmsh->mesh_pp_id;
 223         /* Active path selection metric ID   */
 224         *pos++ = ifmsh->mesh_pm_id;
 225         /* Congestion control mode identifier */
 226         *pos++ = ifmsh->mesh_cc_id;
 227         /* Synchronization protocol identifier */
 228         *pos++ = ifmsh->mesh_sp_id;
 229         /* Authentication Protocol identifier */
 230         *pos++ = ifmsh->mesh_auth_id;
 231         /* Mesh Formation Info - number of neighbors */
 232         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 233         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 234         neighbors = (neighbors > 15) ? 15 : neighbors;
 235         *pos++ = neighbors << 1;
 236         /* Mesh capability */
 237         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 238         *pos = MESHCONF_CAPAB_FORWARDING;
 239         *pos++ |= ifmsh->accepting_plinks ?
 240             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 241         *pos++ = 0x00;
 242
 243         return 0;
 244 }
 245
 246 int
 247 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 248 {
 249         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 250         u8 *pos;
 251
 252         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 253                 return -ENOMEM;
 254
 255         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 256         *pos++ = WLAN_EID_MESH_ID;
 257         *pos++ = ifmsh->mesh_id_len;
 258         if (ifmsh->mesh_id_len)
 259                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 260
 261         return 0;
 262 }
 263
 264 int
 265 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 266 {
 267         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 268         u8 offset, len;
 269         const u8 *data;
 270
 271         if (!ifmsh->ie || !ifmsh->ie_len)
 272                 return 0;
 273
 274         /* fast-forward to vendor IEs */
 275         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 276
 277         if (offset) {
 278                 len = ifmsh->ie_len - offset;
 279                 data = ifmsh->ie + offset;
 280                 if (skb_tailroom(skb) < len)
 281                         return -ENOMEM;
 282                 memcpy(skb_put(skb, len), data, len);
 283         }
 284
 285         return 0;
 286 }
 287
 288 int
 289 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 290 {
 291         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 292         u8 len = 0;
 293         const u8 *data;
 294
 295         if (!ifmsh->ie || !ifmsh->ie_len)
 296                 return 0;
 297
 298         /* find RSN IE */
 299         data = ifmsh->ie;
 300         while (data < ifmsh->ie + ifmsh->ie_len) {
 301                 if (*data == WLAN_EID_RSN) {
 302                         len = data[1] + 2;
 303                         break;
 304                 }
 305                 data++;
 306         }
 307
 308         if (len) {
 309                 if (skb_tailroom(skb) < len)
 310                         return -ENOMEM;
 311                 memcpy(skb_put(skb, len), data, len);
 312         }
 313
 314         return 0;
 315 }
 316
 317 int
 318 mesh_add_srates_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 319 {
 320         struct ieee80211_local *local = sdata->local;
 321         struct ieee80211_supported_band *sband;
 322         int rate;
 323         u8 i, rates, *pos;
 324
 325         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 326         rates = sband->n_bitrates;
 327         if (rates > 8)
 328                 rates = 8;
 329
 330         if (skb_tailroom(skb) < rates + 2)
 331                 return -ENOMEM;
 332
 333         pos = skb_put(skb, rates + 2);
 334         *pos++ = WLAN_EID_SUPP_RATES;
 335         *pos++ = rates;
 336         for (i = 0; i < rates; i++) {
 337                 rate = sband->bitrates[i].bitrate;
 338                 *pos++ = (u8) (rate / 5);
 339         }
 340
 341         return 0;
 342 }
 343
 344 int
 345 mesh_add_ext_srates_ie(struct sk_buff *skb,
 346                        struct ieee80211_sub_if_data *sdata)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         struct ieee80211_supported_band *sband;
 350         int rate;
 351         u8 i, exrates, *pos;
 352
 353         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 354         exrates = sband->n_bitrates;
 355         if (exrates > 8)
 356                 exrates -= 8;
 357         else
 358                 exrates = 0;
 359
 360         if (skb_tailroom(skb) < exrates + 2)
 361                 return -ENOMEM;
 362
 363         if (exrates) {
 364                 pos = skb_put(skb, exrates + 2);
 365                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 366                 *pos++ = exrates;
 367                 for (i = 8; i < sband->n_bitrates; i++) {
 368                         rate = sband->bitrates[i].bitrate;
 369                         *pos++ = (u8) (rate / 5);
 370                 }
 371         }
 372         return 0;
 373 }
 374
 375 int mesh_add_ds_params_ie(struct sk_buff *skb,
 376                           struct ieee80211_sub_if_data *sdata)
 377 {
 378         struct ieee80211_local *local = sdata->local;
 379         struct ieee80211_supported_band *sband;
 380         u8 *pos;
 381
 382         if (skb_tailroom(skb) < 3)
 383                 return -ENOMEM;
 384
 385         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 386         if (sband->band == IEEE80211_BAND_2GHZ) {
 387                 pos = skb_put(skb, 2 + 1);
 388                 *pos++ = WLAN_EID_DS_PARAMS;
 389                 *pos++ = 1;
 390                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 391         }
 392
 393         return 0;
 394 }
 395
 396 static void ieee80211_mesh_path_timer(unsigned long data)
 397 {
 398         struct ieee80211_sub_if_data *sdata =
 399                 (struct ieee80211_sub_if_data *) data;
 400         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 401         struct ieee80211_local *local = sdata->local;
 402
 403         if (local->quiescing) {
 404                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 405                 return;
 406         }
 407
 408         ieee80211_queue_work(&local->hw, &sdata->work);
 409 }
 410
 411 static void ieee80211_mesh_path_root_timer(unsigned long data)
 412 {
 413         struct ieee80211_sub_if_data *sdata =
 414                 (struct ieee80211_sub_if_data *) data;
 415         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 416         struct ieee80211_local *local = sdata->local;
 417
 418         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 419
 420         if (local->quiescing) {
 421                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 422                 return;
 423         }
 424
 425         ieee80211_queue_work(&local->hw, &sdata->work);
 426 }
 427
 428 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 429 {
 430         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 431                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 432         else {
 433                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 434                 /* stop running timer */
 435                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 436         }
 437 }
 438
 439 /**
 440  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 441  * @hdr:        802.11 frame header
 442  * @fc:         frame control field
 443  * @meshda:     destination address in the mesh
 444  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 445  *              locally originated.
 446  *
 447  * Return the length of the 802.11 (does not include a mesh control header)
 448  */
 449 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 450                                   const u8 *meshda, const u8 *meshsa)
 451 {
 452         if (is_multicast_ether_addr(meshda)) {
 453                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 454                 /* DA TA SA */
 455                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 456                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 457                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 458                 return 24;
 459         } else {
 460                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
 461                                 IEEE80211_FCTL_TODS);
 462                 /* RA TA DA SA */
 463                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 464                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 465                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 466                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 467                 return 30;
 468         }
 469 }
 470
 471 /**
 472  * ieee80211_new_mesh_header - create a new mesh header
 473  * @meshhdr:    uninitialized mesh header
 474  * @sdata:      mesh interface to be used
 475  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 476  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 477  *              be NULL.
 478  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 479  *              mesh frame
 480  *
 481  * Return the header length.
 482  */
 483 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 484                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 485                 char *addr6)
 486 {
 487         int aelen = 0;
 488         BUG_ON(!addr4or5 && addr6);
 489         memset(meshhdr, 0, sizeof(*meshhdr));
 490         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 491         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 492         sdata->u.mesh.mesh_seqnum++;
 493         if (addr4or5 && !addr6) {
 494                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 495                 aelen += ETH_ALEN;
 496                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 497         } else if (addr4or5 && addr6) {
 498                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 499                 aelen += 2 * ETH_ALEN;
 500                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 501                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 502         }
 503         return 6 + aelen;
 504 }
 505
 506 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 507                            struct ieee80211_if_mesh *ifmsh)
 508 {
 509         bool free_plinks;
 510
 511 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 512         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 513                sdata->name);
 514 #endif
 515
 516         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 517         mesh_path_expire(sdata);
 518
 519         free_plinks = mesh_plink_availables(sdata);
 520         if (free_plinks != sdata->u.mesh.accepting_plinks)
 521                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 522
 523         mod_timer(&ifmsh->housekeeping_timer,
 524                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 525 }
 526
 527 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 528 {
 529         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 530
 531         mesh_path_tx_root_frame(sdata);
 532         mod_timer(&ifmsh->mesh_path_root_timer,
 533                   round_jiffies(jiffies + IEEE80211_MESH_RANN_INTERVAL));
 534 }
 535
 536 #ifdef CONFIG_PM
 537 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 538 {
 539         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 540
 541         /* use atomic bitops in case both timers fire at the same time */
 542
 543         if (del_timer_sync(&ifmsh->housekeeping_timer))
 544                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 545         if (del_timer_sync(&ifmsh->mesh_path_timer))
 546                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 547         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 548                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 549 }
 550
 551 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 552 {
 553         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 554
 555         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 556                 add_timer(&ifmsh->housekeeping_timer);
 557         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 558                 add_timer(&ifmsh->mesh_path_timer);
 559         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 560                 add_timer(&ifmsh->mesh_path_root_timer);
 561         ieee80211_mesh_root_setup(ifmsh);
 562 }
 563 #endif
 564
 565 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 566 {
 567         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 568         struct ieee80211_local *local = sdata->local;
 569
 570         local->fif_other_bss++;
 571         /* mesh ifaces must set allmulti to forward mcast traffic */
 572         atomic_inc(&local->iff_allmultis);
 573         ieee80211_configure_filter(local);
 574
 575         ifmsh->mesh_cc_id = 0;  /* Disabled */
 576         ifmsh->mesh_sp_id = 0;  /* Neighbor Offset */
 577         ifmsh->mesh_auth_id = 0;        /* Disabled */
 578         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 579         ieee80211_mesh_root_setup(ifmsh);
 580         ieee80211_queue_work(&local->hw, &sdata->work);
 581         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 582         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 583                                                 BSS_CHANGED_BEACON_ENABLED |
 584                                                 BSS_CHANGED_BEACON_INT);
 585 }
 586
 587 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_local *local = sdata->local;
 590         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 591
 592         ifmsh->mesh_id_len = 0;
 593         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 594         sta_info_flush(local, NULL);
 595
 596         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 597         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 598         /*
 599          * If the timer fired while we waited for it, it will have
 600          * requeued the work. Now the work will be running again
 601          * but will not rearm the timer again because it checks
 602          * whether the interface is running, which, at this point,
 603          * it no longer is.
 604          */
 605         cancel_work_sync(&sdata->work);
 606
 607         local->fif_other_bss--;
 608         atomic_dec(&local->iff_allmultis);
 609         ieee80211_configure_filter(local);
 610 }
 611
 612 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 613                                         u16 stype,
 614                                         struct ieee80211_mgmt *mgmt,
 615                                         size_t len,
 616                                         struct ieee80211_rx_status *rx_status)
 617 {
 618         struct ieee80211_local *local = sdata->local;
 619         struct ieee802_11_elems elems;
 620         struct ieee80211_channel *channel;
 621         u32 supp_rates = 0;
 622         size_t baselen;
 623         int freq;
 624         enum ieee80211_band band = rx_status->band;
 625
 626         /* ignore ProbeResp to foreign address */
 627         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 628             compare_ether_addr(mgmt->da, sdata->vif.addr))
 629                 return;
 630
 631         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 632         if (baselen > len)
 633                 return;
 634
 635         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 636                                &elems);
 637
 638         /* ignore beacons from secure mesh peers if our security is off */
 639         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 640                 return;
 641
 642         if (elems.ds_params && elems.ds_params_len == 1)
 643                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 644         else
 645                 freq = rx_status->freq;
 646
 647         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 648
 649         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 650                 return;
 651
 652         if (elems.mesh_id && elems.mesh_config &&
 653             mesh_matches_local(&elems, sdata)) {
 654                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 655                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata, &elems);
 656         }
 657 }
 658
 659 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 660                                           struct ieee80211_mgmt *mgmt,
 661                                           size_t len,
 662                                           struct ieee80211_rx_status *rx_status)
 663 {
 664         switch (mgmt->u.action.category) {
 665         case WLAN_CATEGORY_SELF_PROTECTED:
 666                 switch (mgmt->u.action.u.self_prot.action_code) {
 667                 case WLAN_SP_MESH_PEERING_OPEN:
 668                 case WLAN_SP_MESH_PEERING_CLOSE:
 669                 case WLAN_SP_MESH_PEERING_CONFIRM:
 670                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 671                         break;
 672                 }
 673                 break;
 674         case WLAN_CATEGORY_MESH_PATH_SEL:
 675                 mesh_rx_path_sel_frame(sdata, mgmt, len);
 676                 break;
 677         }
 678 }
 679
 680 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 681                                    struct sk_buff *skb)
 682 {
 683         struct ieee80211_rx_status *rx_status;
 684         struct ieee80211_mgmt *mgmt;
 685         u16 stype;
 686
 687         rx_status = IEEE80211_SKB_RXCB(skb);
 688         mgmt = (struct ieee80211_mgmt *) skb->data;
 689         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 690
 691         switch (stype) {
 692         case IEEE80211_STYPE_PROBE_RESP:
 693         case IEEE80211_STYPE_BEACON:
 694                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 695                                             rx_status);
 696                 break;
 697         case IEEE80211_STYPE_ACTION:
 698                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 699                 break;
 700         }
 701 }
 702
 703 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 704 {
 705         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 706
 707         if (ifmsh->preq_queue_len &&
 708             time_after(jiffies,
 709                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 710                 mesh_path_start_discovery(sdata);
 711
 712         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 713                 mesh_mpath_table_grow();
 714
 715         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 716                 mesh_mpp_table_grow();
 717
 718         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 719                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 720
 721         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 722                 ieee80211_mesh_rootpath(sdata);
 723 }
 724
 725 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 726 {
 727         struct ieee80211_sub_if_data *sdata;
 728
 729         rcu_read_lock();
 730         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 731                 if (ieee80211_vif_is_mesh(&sdata->vif))
 732                         ieee80211_queue_work(&local->hw, &sdata->work);
 733         rcu_read_unlock();
 734 }
 735
 736 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 737 {
 738         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 739
 740         setup_timer(&ifmsh->housekeeping_timer,
 741                     ieee80211_mesh_housekeeping_timer,
 742                     (unsigned long) sdata);
 743
 744         ifmsh->accepting_plinks = true;
 745         ifmsh->preq_id = 0;
 746         ifmsh->sn = 0;
 747         atomic_set(&ifmsh->mpaths, 0);
 748         mesh_rmc_init(sdata);
 749         ifmsh->last_preq = jiffies;
 750         /* Allocate all mesh structures when creating the first mesh interface. */
 751         if (!mesh_allocated)
 752                 ieee80211s_init();
 753         setup_timer(&ifmsh->mesh_path_timer,
 754                     ieee80211_mesh_path_timer,
 755                     (unsigned long) sdata);
 756         setup_timer(&ifmsh->mesh_path_root_timer,
 757                     ieee80211_mesh_path_root_timer,
 758                     (unsigned long) sdata);
 759         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 760         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 761 }