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 TMR_RUNNING_HK  0
  17 #define TMR_RUNNING_MP  1
  18 #define TMR_RUNNING_MPR 2
  19
  20 int mesh_allocated;
  21 static struct kmem_cache *rm_cache;
  22
  23 #ifdef CONFIG_MAC80211_MESH
  24 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  25 {
  26         return (mgmt->u.action.u.mesh_action.action_code ==
  27                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  28 }
  29 #else
  30 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  31 { return false; }
  32 #endif
  33
  34 void ieee80211s_init(void)
  35 {
  36         mesh_pathtbl_init();
  37         mesh_allocated = 1;
  38         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  39                                      0, 0, NULL);
  40 }
  41
  42 void ieee80211s_stop(void)
  43 {
  44         mesh_pathtbl_unregister();
  45         kmem_cache_destroy(rm_cache);
  46 }
  47
  48 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  49 {
  50         struct ieee80211_sub_if_data *sdata = (void *) data;
  51         struct ieee80211_local *local = sdata->local;
  52         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  53
  54         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  55
  56         if (local->quiescing) {
  57                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  58                 return;
  59         }
  60
  61         ieee80211_queue_work(&local->hw, &sdata->work);
  62 }
  63
  64 /**
  65  * mesh_matches_local - check if the config of a mesh point matches ours
  66  *
  67  * @sdata: local mesh subif
  68  * @ie: information elements of a management frame from the mesh peer
  69  *
  70  * This function checks if the mesh configuration of a mesh point matches the
  71  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  72  */
  73 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  74                         struct ieee802_11_elems *ie)
  75 {
  76         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  77         struct ieee80211_local *local = sdata->local;
  78         u32 basic_rates = 0;
  79
  80         /*
  81          * As support for each feature is added, check for matching
  82          * - On mesh config capabilities
  83          *   - Power Save Support En
  84          *   - Sync support enabled
  85          *   - Sync support active
  86          *   - Sync support required from peer
  87          *   - MDA enabled
  88          * - Power management control on fc
  89          */
  90         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  91              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  92              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  93              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  94              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  95              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  96              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  97                 goto mismatch;
  98
  99         ieee80211_sta_get_rates(local, ie, local->oper_channel->band,
 100                                 &basic_rates);
 101
 102         if (sdata->vif.bss_conf.basic_rates != basic_rates)
 103                 goto mismatch;
 104
 105         /* disallow peering with mismatched channel types for now */
 106         if (ie->ht_operation &&
 107             (local->_oper_channel_type !=
 108              ieee80211_ht_oper_to_channel_type(ie->ht_operation)))
 109                 goto mismatch;
 110
 111         return true;
 112 mismatch:
 113         return false;
 114 }
 115
 116 /**
 117  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 118  *
 119  * @ie: information elements of a management frame from the mesh peer
 120  */
 121 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 122 {
 123         return (ie->mesh_config->meshconf_cap &
 124             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 125 }
 126
 127 /**
 128  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 129  *
 130  * @sdata: mesh interface in which mesh beacons are going to be updated
 131  */
 132 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 133 {
 134         bool free_plinks;
 135
 136         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 137          * the mesh interface might be able to establish plinks with peers that
 138          * are already on the table but are not on PLINK_ESTAB state. However,
 139          * in general the mesh interface is not accepting peer link requests
 140          * from new peers, and that must be reflected in the beacon
 141          */
 142         free_plinks = mesh_plink_availables(sdata);
 143
 144         if (free_plinks != sdata->u.mesh.accepting_plinks)
 145                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 146 }
 147
 148 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 149 {
 150         int i;
 151
 152         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 153         if (!sdata->u.mesh.rmc)
 154                 return -ENOMEM;
 155         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 156         for (i = 0; i < RMC_BUCKETS; i++)
 157                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 158         return 0;
 159 }
 160
 161 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 162 {
 163         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 164         struct rmc_entry *p, *n;
 165         int i;
 166
 167         if (!sdata->u.mesh.rmc)
 168                 return;
 169
 170         for (i = 0; i < RMC_BUCKETS; i++)
 171                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 172                         list_del(&p->list);
 173                         kmem_cache_free(rm_cache, p);
 174                 }
 175
 176         kfree(rmc);
 177         sdata->u.mesh.rmc = NULL;
 178 }
 179
 180 /**
 181  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 182  *
 183  * @sa:         source address
 184  * @mesh_hdr:   mesh_header
 185  *
 186  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 187  *
 188  * Checks using the source address and the mesh sequence number if we have
 189  * received this frame lately. If the frame is not in the cache, it is added to
 190  * it.
 191  */
 192 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 193                    struct ieee80211_sub_if_data *sdata)
 194 {
 195         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 196         u32 seqnum = 0;
 197         int entries = 0;
 198         u8 idx;
 199         struct rmc_entry *p, *n;
 200
 201         /* Don't care about endianness since only match matters */
 202         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 203         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 204         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 205                 ++entries;
 206                 if (time_after(jiffies, p->exp_time) ||
 207                                 (entries == RMC_QUEUE_MAX_LEN)) {
 208                         list_del(&p->list);
 209                         kmem_cache_free(rm_cache, p);
 210                         --entries;
 211                 } else if ((seqnum == p->seqnum) &&
 212                            (compare_ether_addr(sa, p->sa) == 0))
 213                         return -1;
 214         }
 215
 216         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 217         if (!p)
 218                 return 0;
 219
 220         p->seqnum = seqnum;
 221         p->exp_time = jiffies + RMC_TIMEOUT;
 222         memcpy(p->sa, sa, ETH_ALEN);
 223         list_add(&p->list, &rmc->bucket[idx].list);
 224         return 0;
 225 }
 226
 227 int
 228 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 229 {
 230         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 231         u8 *pos, neighbors;
 232         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 233
 234         if (skb_tailroom(skb) < 2 + meshconf_len)
 235                 return -ENOMEM;
 236
 237         pos = skb_put(skb, 2 + meshconf_len);
 238         *pos++ = WLAN_EID_MESH_CONFIG;
 239         *pos++ = meshconf_len;
 240
 241         /* Active path selection protocol ID */
 242         *pos++ = ifmsh->mesh_pp_id;
 243         /* Active path selection metric ID   */
 244         *pos++ = ifmsh->mesh_pm_id;
 245         /* Congestion control mode identifier */
 246         *pos++ = ifmsh->mesh_cc_id;
 247         /* Synchronization protocol identifier */
 248         *pos++ = ifmsh->mesh_sp_id;
 249         /* Authentication Protocol identifier */
 250         *pos++ = ifmsh->mesh_auth_id;
 251         /* Mesh Formation Info - number of neighbors */
 252         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 253         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 254         neighbors = (neighbors > 15) ? 15 : neighbors;
 255         *pos++ = neighbors << 1;
 256         /* Mesh capability */
 257         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 258         *pos = MESHCONF_CAPAB_FORWARDING;
 259         *pos |= ifmsh->accepting_plinks ?
 260             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 261         *pos++ |= ifmsh->adjusting_tbtt ?
 262             MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 263         *pos++ = 0x00;
 264
 265         return 0;
 266 }
 267
 268 int
 269 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 270 {
 271         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 272         u8 *pos;
 273
 274         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 275                 return -ENOMEM;
 276
 277         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 278         *pos++ = WLAN_EID_MESH_ID;
 279         *pos++ = ifmsh->mesh_id_len;
 280         if (ifmsh->mesh_id_len)
 281                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 282
 283         return 0;
 284 }
 285
 286 int
 287 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 288 {
 289         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 290         u8 offset, len;
 291         const u8 *data;
 292
 293         if (!ifmsh->ie || !ifmsh->ie_len)
 294                 return 0;
 295
 296         /* fast-forward to vendor IEs */
 297         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 298
 299         if (offset) {
 300                 len = ifmsh->ie_len - offset;
 301                 data = ifmsh->ie + offset;
 302                 if (skb_tailroom(skb) < len)
 303                         return -ENOMEM;
 304                 memcpy(skb_put(skb, len), data, len);
 305         }
 306
 307         return 0;
 308 }
 309
 310 int
 311 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 312 {
 313         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 314         u8 len = 0;
 315         const u8 *data;
 316
 317         if (!ifmsh->ie || !ifmsh->ie_len)
 318                 return 0;
 319
 320         /* find RSN IE */
 321         data = ifmsh->ie;
 322         while (data < ifmsh->ie + ifmsh->ie_len) {
 323                 if (*data == WLAN_EID_RSN) {
 324                         len = data[1] + 2;
 325                         break;
 326                 }
 327                 data++;
 328         }
 329
 330         if (len) {
 331                 if (skb_tailroom(skb) < len)
 332                         return -ENOMEM;
 333                 memcpy(skb_put(skb, len), data, len);
 334         }
 335
 336         return 0;
 337 }
 338
 339 int mesh_add_ds_params_ie(struct sk_buff *skb,
 340                           struct ieee80211_sub_if_data *sdata)
 341 {
 342         struct ieee80211_local *local = sdata->local;
 343         struct ieee80211_supported_band *sband;
 344         u8 *pos;
 345
 346         if (skb_tailroom(skb) < 3)
 347                 return -ENOMEM;
 348
 349         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 350         if (sband->band == IEEE80211_BAND_2GHZ) {
 351                 pos = skb_put(skb, 2 + 1);
 352                 *pos++ = WLAN_EID_DS_PARAMS;
 353                 *pos++ = 1;
 354                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 355         }
 356
 357         return 0;
 358 }
 359
 360 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 361                        struct ieee80211_sub_if_data *sdata)
 362 {
 363         struct ieee80211_local *local = sdata->local;
 364         struct ieee80211_supported_band *sband;
 365         u8 *pos;
 366
 367         sband = local->hw.wiphy->bands[local->oper_channel->band];
 368         if (!sband->ht_cap.ht_supported ||
 369             local->_oper_channel_type == NL80211_CHAN_NO_HT)
 370                 return 0;
 371
 372         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 373                 return -ENOMEM;
 374
 375         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 376         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 377
 378         return 0;
 379 }
 380
 381 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 382                         struct ieee80211_sub_if_data *sdata)
 383 {
 384         struct ieee80211_local *local = sdata->local;
 385         struct ieee80211_channel *channel = local->oper_channel;
 386         enum nl80211_channel_type channel_type = local->_oper_channel_type;
 387         struct ieee80211_supported_band *sband =
 388                                 local->hw.wiphy->bands[channel->band];
 389         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 390         u8 *pos;
 391
 392         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 393                 return 0;
 394
 395         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 396                 return -ENOMEM;
 397
 398         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 399         ieee80211_ie_build_ht_oper(pos, ht_cap, channel, channel_type);
 400
 401         return 0;
 402 }
 403 static void ieee80211_mesh_path_timer(unsigned long data)
 404 {
 405         struct ieee80211_sub_if_data *sdata =
 406                 (struct ieee80211_sub_if_data *) data;
 407         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 408         struct ieee80211_local *local = sdata->local;
 409
 410         if (local->quiescing) {
 411                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 412                 return;
 413         }
 414
 415         ieee80211_queue_work(&local->hw, &sdata->work);
 416 }
 417
 418 static void ieee80211_mesh_path_root_timer(unsigned long data)
 419 {
 420         struct ieee80211_sub_if_data *sdata =
 421                 (struct ieee80211_sub_if_data *) data;
 422         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 423         struct ieee80211_local *local = sdata->local;
 424
 425         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 426
 427         if (local->quiescing) {
 428                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 429                 return;
 430         }
 431
 432         ieee80211_queue_work(&local->hw, &sdata->work);
 433 }
 434
 435 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 436 {
 437         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 438                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 439         else {
 440                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 441                 /* stop running timer */
 442                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 443         }
 444 }
 445
 446 /**
 447  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 448  * @hdr:        802.11 frame header
 449  * @fc:         frame control field
 450  * @meshda:     destination address in the mesh
 451  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 452  *              locally originated.
 453  *
 454  * Return the length of the 802.11 (does not include a mesh control header)
 455  */
 456 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 457                                   const u8 *meshda, const u8 *meshsa)
 458 {
 459         if (is_multicast_ether_addr(meshda)) {
 460                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 461                 /* DA TA SA */
 462                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 463                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 464                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 465                 return 24;
 466         } else {
 467                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 468                 /* RA TA DA SA */
 469                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 470                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 471                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 472                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 473                 return 30;
 474         }
 475 }
 476
 477 /**
 478  * ieee80211_new_mesh_header - create a new mesh header
 479  * @meshhdr:    uninitialized mesh header
 480  * @sdata:      mesh interface to be used
 481  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 482  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 483  *              be NULL.
 484  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 485  *              mesh frame
 486  *
 487  * Return the header length.
 488  */
 489 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 490                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 491                 char *addr6)
 492 {
 493         int aelen = 0;
 494         BUG_ON(!addr4or5 && addr6);
 495         memset(meshhdr, 0, sizeof(*meshhdr));
 496         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 497         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 498         sdata->u.mesh.mesh_seqnum++;
 499         if (addr4or5 && !addr6) {
 500                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 501                 aelen += ETH_ALEN;
 502                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 503         } else if (addr4or5 && addr6) {
 504                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 505                 aelen += 2 * ETH_ALEN;
 506                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 507                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 508         }
 509         return 6 + aelen;
 510 }
 511
 512 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 513                            struct ieee80211_if_mesh *ifmsh)
 514 {
 515         bool free_plinks;
 516
 517 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 518         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 519                sdata->name);
 520 #endif
 521
 522         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 523         mesh_path_expire(sdata);
 524
 525         free_plinks = mesh_plink_availables(sdata);
 526         if (free_plinks != sdata->u.mesh.accepting_plinks)
 527                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 528
 529         mod_timer(&ifmsh->housekeeping_timer,
 530                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 531 }
 532
 533 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 534 {
 535         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 536
 537         mesh_path_tx_root_frame(sdata);
 538         mod_timer(&ifmsh->mesh_path_root_timer,
 539                   round_jiffies(TU_TO_EXP_TIME(
 540                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 541 }
 542
 543 #ifdef CONFIG_PM
 544 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 545 {
 546         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 547
 548         /* use atomic bitops in case all timers fire at the same time */
 549
 550         if (del_timer_sync(&ifmsh->housekeeping_timer))
 551                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 552         if (del_timer_sync(&ifmsh->mesh_path_timer))
 553                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 554         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 555                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 556 }
 557
 558 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 559 {
 560         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 561
 562         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 563                 add_timer(&ifmsh->housekeeping_timer);
 564         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 565                 add_timer(&ifmsh->mesh_path_timer);
 566         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 567                 add_timer(&ifmsh->mesh_path_root_timer);
 568         ieee80211_mesh_root_setup(ifmsh);
 569 }
 570 #endif
 571
 572 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 573 {
 574         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 575         struct ieee80211_local *local = sdata->local;
 576
 577         local->fif_other_bss++;
 578         /* mesh ifaces must set allmulti to forward mcast traffic */
 579         atomic_inc(&local->iff_allmultis);
 580         ieee80211_configure_filter(local);
 581
 582         ifmsh->mesh_cc_id = 0;  /* Disabled */
 583         ifmsh->mesh_auth_id = 0;        /* Disabled */
 584         /* register sync ops from extensible synchronization framework */
 585         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 586         ifmsh->adjusting_tbtt = false;
 587         ifmsh->sync_offset_clockdrift_max = 0;
 588         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 589         ieee80211_mesh_root_setup(ifmsh);
 590         ieee80211_queue_work(&local->hw, &sdata->work);
 591         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 592         sdata->vif.bss_conf.basic_rates =
 593                 ieee80211_mandatory_rates(sdata->local,
 594                                           sdata->local->hw.conf.channel->band);
 595         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 596                                                 BSS_CHANGED_BEACON_ENABLED |
 597                                                 BSS_CHANGED_BASIC_RATES |
 598                                                 BSS_CHANGED_BEACON_INT);
 599 }
 600
 601 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 602 {
 603         struct ieee80211_local *local = sdata->local;
 604         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 605
 606         ifmsh->mesh_id_len = 0;
 607         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 608         sta_info_flush(local, NULL);
 609
 610         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 611         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 612         /*
 613          * If the timer fired while we waited for it, it will have
 614          * requeued the work. Now the work will be running again
 615          * but will not rearm the timer again because it checks
 616          * whether the interface is running, which, at this point,
 617          * it no longer is.
 618          */
 619         cancel_work_sync(&sdata->work);
 620
 621         local->fif_other_bss--;
 622         atomic_dec(&local->iff_allmultis);
 623         ieee80211_configure_filter(local);
 624 }
 625
 626 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 627                                         u16 stype,
 628                                         struct ieee80211_mgmt *mgmt,
 629                                         size_t len,
 630                                         struct ieee80211_rx_status *rx_status)
 631 {
 632         struct ieee80211_local *local = sdata->local;
 633         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 634         struct ieee802_11_elems elems;
 635         struct ieee80211_channel *channel;
 636         size_t baselen;
 637         int freq;
 638         enum ieee80211_band band = rx_status->band;
 639
 640         /* ignore ProbeResp to foreign address */
 641         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 642             compare_ether_addr(mgmt->da, sdata->vif.addr))
 643                 return;
 644
 645         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 646         if (baselen > len)
 647                 return;
 648
 649         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 650                                &elems);
 651
 652         /* ignore beacons from secure mesh peers if our security is off */
 653         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 654                 return;
 655
 656         if (elems.ds_params && elems.ds_params_len == 1)
 657                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 658         else
 659                 freq = rx_status->freq;
 660
 661         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 662
 663         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 664                 return;
 665
 666         if (elems.mesh_id && elems.mesh_config &&
 667             mesh_matches_local(sdata, &elems))
 668                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 669
 670         if (ifmsh->sync_ops)
 671                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 672                         stype, mgmt, &elems, rx_status);
 673 }
 674
 675 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 676                                           struct ieee80211_mgmt *mgmt,
 677                                           size_t len,
 678                                           struct ieee80211_rx_status *rx_status)
 679 {
 680         switch (mgmt->u.action.category) {
 681         case WLAN_CATEGORY_SELF_PROTECTED:
 682                 switch (mgmt->u.action.u.self_prot.action_code) {
 683                 case WLAN_SP_MESH_PEERING_OPEN:
 684                 case WLAN_SP_MESH_PEERING_CLOSE:
 685                 case WLAN_SP_MESH_PEERING_CONFIRM:
 686                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 687                         break;
 688                 }
 689                 break;
 690         case WLAN_CATEGORY_MESH_ACTION:
 691                 if (mesh_action_is_path_sel(mgmt))
 692                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 693                 break;
 694         }
 695 }
 696
 697 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 698                                    struct sk_buff *skb)
 699 {
 700         struct ieee80211_rx_status *rx_status;
 701         struct ieee80211_mgmt *mgmt;
 702         u16 stype;
 703
 704         rx_status = IEEE80211_SKB_RXCB(skb);
 705         mgmt = (struct ieee80211_mgmt *) skb->data;
 706         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 707
 708         switch (stype) {
 709         case IEEE80211_STYPE_PROBE_RESP:
 710         case IEEE80211_STYPE_BEACON:
 711                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 712                                             rx_status);
 713                 break;
 714         case IEEE80211_STYPE_ACTION:
 715                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 716                 break;
 717         }
 718 }
 719
 720 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 721 {
 722         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 723
 724         if (ifmsh->preq_queue_len &&
 725             time_after(jiffies,
 726                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 727                 mesh_path_start_discovery(sdata);
 728
 729         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 730                 mesh_mpath_table_grow();
 731
 732         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 733                 mesh_mpp_table_grow();
 734
 735         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 736                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 737
 738         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 739                 ieee80211_mesh_rootpath(sdata);
 740
 741         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 742                 mesh_sync_adjust_tbtt(sdata);
 743 }
 744
 745 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 746 {
 747         struct ieee80211_sub_if_data *sdata;
 748
 749         rcu_read_lock();
 750         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 751                 if (ieee80211_vif_is_mesh(&sdata->vif))
 752                         ieee80211_queue_work(&local->hw, &sdata->work);
 753         rcu_read_unlock();
 754 }
 755
 756 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 757 {
 758         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 759
 760         setup_timer(&ifmsh->housekeeping_timer,
 761                     ieee80211_mesh_housekeeping_timer,
 762                     (unsigned long) sdata);
 763
 764         ifmsh->accepting_plinks = true;
 765         ifmsh->preq_id = 0;
 766         ifmsh->sn = 0;
 767         ifmsh->num_gates = 0;
 768         atomic_set(&ifmsh->mpaths, 0);
 769         mesh_rmc_init(sdata);
 770         ifmsh->last_preq = jiffies;
 771         ifmsh->next_perr = jiffies;
 772         /* Allocate all mesh structures when creating the first mesh interface. */
 773         if (!mesh_allocated)
 774                 ieee80211s_init();
 775         setup_timer(&ifmsh->mesh_path_timer,
 776                     ieee80211_mesh_path_timer,
 777                     (unsigned long) sdata);
 778         setup_timer(&ifmsh->mesh_path_root_timer,
 779                     ieee80211_mesh_path_root_timer,
 780                     (unsigned long) sdata);
 781         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 782         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 783         spin_lock_init(&ifmsh->sync_offset_lock);
 784 }