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 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  24 {
  25         return (mgmt->u.action.u.mesh_action.action_code ==
  26                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  27 }
  28
  29 void ieee80211s_init(void)
  30 {
  31         mesh_pathtbl_init();
  32         mesh_allocated = 1;
  33         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  34                                      0, 0, NULL);
  35 }
  36
  37 void ieee80211s_stop(void)
  38 {
  39         mesh_pathtbl_unregister();
  40         kmem_cache_destroy(rm_cache);
  41 }
  42
  43 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  44 {
  45         struct ieee80211_sub_if_data *sdata = (void *) data;
  46         struct ieee80211_local *local = sdata->local;
  47         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  48
  49         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  50
  51         if (local->quiescing) {
  52                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  53                 return;
  54         }
  55
  56         ieee80211_queue_work(&local->hw, &sdata->work);
  57 }
  58
  59 /**
  60  * mesh_matches_local - check if the config of a mesh point matches ours
  61  *
  62  * @sdata: local mesh subif
  63  * @ie: information elements of a management frame from the mesh peer
  64  *
  65  * This function checks if the mesh configuration of a mesh point matches the
  66  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  67  */
  68 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
  69                         struct ieee802_11_elems *ie)
  70 {
  71         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  72         struct ieee80211_local *local = sdata->local;
  73         u32 basic_rates = 0;
  74         struct cfg80211_chan_def sta_chan_def;
  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_psel) &&
  89              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  90              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  91              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  92              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  93                 goto mismatch;
  94
  95         ieee80211_sta_get_rates(local, ie, ieee80211_get_sdata_band(sdata),
  96                                 &basic_rates);
  97
  98         if (sdata->vif.bss_conf.basic_rates != basic_rates)
  99                 goto mismatch;
 100
 101         ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
 102                                      ie->ht_operation, &sta_chan_def);
 103
 104         if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
 105                                          &sta_chan_def))
 106                 goto mismatch;
 107
 108         return true;
 109 mismatch:
 110         return false;
 111 }
 112
 113 /**
 114  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 115  *
 116  * @ie: information elements of a management frame from the mesh peer
 117  */
 118 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 119 {
 120         return (ie->mesh_config->meshconf_cap &
 121             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 122 }
 123
 124 /**
 125  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
 126  *
 127  * @sdata: mesh interface in which mesh beacons are going to be updated
 128  *
 129  * Returns: beacon changed flag if the beacon content changed.
 130  */
 131 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 132 {
 133         bool free_plinks;
 134         u32 changed = 0;
 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                 sdata->u.mesh.accepting_plinks = free_plinks;
 146                 changed = BSS_CHANGED_BEACON;
 147         }
 148
 149         return changed;
 150 }
 151
 152 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 153 {
 154         int i;
 155
 156         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 157         if (!sdata->u.mesh.rmc)
 158                 return -ENOMEM;
 159         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 160         for (i = 0; i < RMC_BUCKETS; i++)
 161                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
 162         return 0;
 163 }
 164
 165 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 166 {
 167         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 168         struct rmc_entry *p, *n;
 169         int i;
 170
 171         if (!sdata->u.mesh.rmc)
 172                 return;
 173
 174         for (i = 0; i < RMC_BUCKETS; i++)
 175                 list_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
 176                         list_del(&p->list);
 177                         kmem_cache_free(rm_cache, p);
 178                 }
 179
 180         kfree(rmc);
 181         sdata->u.mesh.rmc = NULL;
 182 }
 183
 184 /**
 185  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 186  *
 187  * @sa:         source address
 188  * @mesh_hdr:   mesh_header
 189  *
 190  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 191  *
 192  * Checks using the source address and the mesh sequence number if we have
 193  * received this frame lately. If the frame is not in the cache, it is added to
 194  * it.
 195  */
 196 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 197                    struct ieee80211_sub_if_data *sdata)
 198 {
 199         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 200         u32 seqnum = 0;
 201         int entries = 0;
 202         u8 idx;
 203         struct rmc_entry *p, *n;
 204
 205         /* Don't care about endianness since only match matters */
 206         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 207         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 208         list_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
 209                 ++entries;
 210                 if (time_after(jiffies, p->exp_time) ||
 211                                 (entries == RMC_QUEUE_MAX_LEN)) {
 212                         list_del(&p->list);
 213                         kmem_cache_free(rm_cache, p);
 214                         --entries;
 215                 } else if ((seqnum == p->seqnum) &&
 216                            (ether_addr_equal(sa, p->sa)))
 217                         return -1;
 218         }
 219
 220         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 221         if (!p)
 222                 return 0;
 223
 224         p->seqnum = seqnum;
 225         p->exp_time = jiffies + RMC_TIMEOUT;
 226         memcpy(p->sa, sa, ETH_ALEN);
 227         list_add(&p->list, &rmc->bucket[idx]);
 228         return 0;
 229 }
 230
 231 int
 232 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 233 {
 234         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 235         u8 *pos, neighbors;
 236         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 237
 238         if (skb_tailroom(skb) < 2 + meshconf_len)
 239                 return -ENOMEM;
 240
 241         pos = skb_put(skb, 2 + meshconf_len);
 242         *pos++ = WLAN_EID_MESH_CONFIG;
 243         *pos++ = meshconf_len;
 244
 245         /* Active path selection protocol ID */
 246         *pos++ = ifmsh->mesh_pp_id;
 247         /* Active path selection metric ID   */
 248         *pos++ = ifmsh->mesh_pm_id;
 249         /* Congestion control mode identifier */
 250         *pos++ = ifmsh->mesh_cc_id;
 251         /* Synchronization protocol identifier */
 252         *pos++ = ifmsh->mesh_sp_id;
 253         /* Authentication Protocol identifier */
 254         *pos++ = ifmsh->mesh_auth_id;
 255         /* Mesh Formation Info - number of neighbors */
 256         neighbors = atomic_read(&ifmsh->estab_plinks);
 257         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 258         neighbors = (neighbors > 15) ? 15 : neighbors;
 259         *pos++ = neighbors << 1;
 260         /* Mesh capability */
 261         *pos = IEEE80211_MESHCONF_CAPAB_FORWARDING;
 262         *pos |= ifmsh->accepting_plinks ?
 263             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 264         *pos++ |= ifmsh->adjusting_tbtt ?
 265             IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING : 0x00;
 266         *pos++ = 0x00;
 267
 268         return 0;
 269 }
 270
 271 int
 272 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 273 {
 274         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 275         u8 *pos;
 276
 277         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 278                 return -ENOMEM;
 279
 280         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 281         *pos++ = WLAN_EID_MESH_ID;
 282         *pos++ = ifmsh->mesh_id_len;
 283         if (ifmsh->mesh_id_len)
 284                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 285
 286         return 0;
 287 }
 288
 289 int
 290 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 291 {
 292         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 293         u8 offset, len;
 294         const u8 *data;
 295
 296         if (!ifmsh->ie || !ifmsh->ie_len)
 297                 return 0;
 298
 299         /* fast-forward to vendor IEs */
 300         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 301
 302         if (offset) {
 303                 len = ifmsh->ie_len - offset;
 304                 data = ifmsh->ie + offset;
 305                 if (skb_tailroom(skb) < len)
 306                         return -ENOMEM;
 307                 memcpy(skb_put(skb, len), data, len);
 308         }
 309
 310         return 0;
 311 }
 312
 313 int
 314 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 315 {
 316         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 317         u8 len = 0;
 318         const u8 *data;
 319
 320         if (!ifmsh->ie || !ifmsh->ie_len)
 321                 return 0;
 322
 323         /* find RSN IE */
 324         data = ifmsh->ie;
 325         while (data < ifmsh->ie + ifmsh->ie_len) {
 326                 if (*data == WLAN_EID_RSN) {
 327                         len = data[1] + 2;
 328                         break;
 329                 }
 330                 data++;
 331         }
 332
 333         if (len) {
 334                 if (skb_tailroom(skb) < len)
 335                         return -ENOMEM;
 336                 memcpy(skb_put(skb, len), data, len);
 337         }
 338
 339         return 0;
 340 }
 341
 342 int mesh_add_ds_params_ie(struct sk_buff *skb,
 343                           struct ieee80211_sub_if_data *sdata)
 344 {
 345         struct ieee80211_local *local = sdata->local;
 346         struct ieee80211_supported_band *sband;
 347         struct ieee80211_chanctx_conf *chanctx_conf;
 348         struct ieee80211_channel *chan;
 349         u8 *pos;
 350
 351         if (skb_tailroom(skb) < 3)
 352                 return -ENOMEM;
 353
 354         rcu_read_lock();
 355         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 356         if (WARN_ON(!chanctx_conf)) {
 357                 rcu_read_unlock();
 358                 return -EINVAL;
 359         }
 360         chan = chanctx_conf->def.chan;
 361         rcu_read_unlock();
 362
 363         sband = local->hw.wiphy->bands[chan->band];
 364         if (sband->band == IEEE80211_BAND_2GHZ) {
 365                 pos = skb_put(skb, 2 + 1);
 366                 *pos++ = WLAN_EID_DS_PARAMS;
 367                 *pos++ = 1;
 368                 *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 369         }
 370
 371         return 0;
 372 }
 373
 374 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 375                        struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 379         struct ieee80211_supported_band *sband;
 380         u8 *pos;
 381
 382         sband = local->hw.wiphy->bands[band];
 383         if (!sband->ht_cap.ht_supported ||
 384             sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
 385                 return 0;
 386
 387         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 388                 return -ENOMEM;
 389
 390         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 391         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 392
 393         return 0;
 394 }
 395
 396 int mesh_add_ht_oper_ie(struct sk_buff *skb,
 397                         struct ieee80211_sub_if_data *sdata)
 398 {
 399         struct ieee80211_local *local = sdata->local;
 400         struct ieee80211_chanctx_conf *chanctx_conf;
 401         struct ieee80211_channel *channel;
 402         enum nl80211_channel_type channel_type =
 403                 cfg80211_get_chandef_type(&sdata->vif.bss_conf.chandef);
 404         struct ieee80211_supported_band *sband;
 405         struct ieee80211_sta_ht_cap *ht_cap;
 406         u8 *pos;
 407
 408         rcu_read_lock();
 409         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
 410         if (WARN_ON(!chanctx_conf)) {
 411                 rcu_read_unlock();
 412                 return -EINVAL;
 413         }
 414         channel = chanctx_conf->def.chan;
 415         rcu_read_unlock();
 416
 417         sband = local->hw.wiphy->bands[channel->band];
 418         ht_cap = &sband->ht_cap;
 419
 420         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 421                 return 0;
 422
 423         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
 424                 return -ENOMEM;
 425
 426         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
 427         ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
 428                                    sdata->vif.bss_conf.ht_operation_mode);
 429
 430         return 0;
 431 }
 432 static void ieee80211_mesh_path_timer(unsigned long data)
 433 {
 434         struct ieee80211_sub_if_data *sdata =
 435                 (struct ieee80211_sub_if_data *) data;
 436         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 437         struct ieee80211_local *local = sdata->local;
 438
 439         if (local->quiescing) {
 440                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 441                 return;
 442         }
 443
 444         ieee80211_queue_work(&local->hw, &sdata->work);
 445 }
 446
 447 static void ieee80211_mesh_path_root_timer(unsigned long data)
 448 {
 449         struct ieee80211_sub_if_data *sdata =
 450                 (struct ieee80211_sub_if_data *) data;
 451         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 452         struct ieee80211_local *local = sdata->local;
 453
 454         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 455
 456         if (local->quiescing) {
 457                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 458                 return;
 459         }
 460
 461         ieee80211_queue_work(&local->hw, &sdata->work);
 462 }
 463
 464 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 465 {
 466         if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
 467                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 468         else {
 469                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 470                 /* stop running timer */
 471                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 472         }
 473 }
 474
 475 /**
 476  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 477  * @hdr:        802.11 frame header
 478  * @fc:         frame control field
 479  * @meshda:     destination address in the mesh
 480  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 481  *              locally originated.
 482  *
 483  * Return the length of the 802.11 (does not include a mesh control header)
 484  */
 485 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 486                                   const u8 *meshda, const u8 *meshsa)
 487 {
 488         if (is_multicast_ether_addr(meshda)) {
 489                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 490                 /* DA TA SA */
 491                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 492                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 493                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 494                 return 24;
 495         } else {
 496                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 497                 /* RA TA DA SA */
 498                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 499                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 500                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 501                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 502                 return 30;
 503         }
 504 }
 505
 506 /**
 507  * ieee80211_new_mesh_header - create a new mesh header
 508  * @meshhdr:    uninitialized mesh header
 509  * @sdata:      mesh interface to be used
 510  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 511  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 512  *              be NULL.
 513  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 514  *              mesh frame
 515  *
 516  * Return the header length.
 517  */
 518 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 519                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 520                 char *addr6)
 521 {
 522         int aelen = 0;
 523         BUG_ON(!addr4or5 && addr6);
 524         memset(meshhdr, 0, sizeof(*meshhdr));
 525         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 526         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 527         sdata->u.mesh.mesh_seqnum++;
 528         if (addr4or5 && !addr6) {
 529                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 530                 aelen += ETH_ALEN;
 531                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 532         } else if (addr4or5 && addr6) {
 533                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 534                 aelen += 2 * ETH_ALEN;
 535                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 536                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 537         }
 538         return 6 + aelen;
 539 }
 540
 541 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 542                            struct ieee80211_if_mesh *ifmsh)
 543 {
 544         u32 changed;
 545
 546         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 547         mesh_path_expire(sdata);
 548
 549         changed = mesh_accept_plinks_update(sdata);
 550         ieee80211_bss_info_change_notify(sdata, changed);
 551
 552         mod_timer(&ifmsh->housekeeping_timer,
 553                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 554 }
 555
 556 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 557 {
 558         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 559         u32 interval;
 560
 561         mesh_path_tx_root_frame(sdata);
 562
 563         if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
 564                 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 565         else
 566                 interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 567
 568         mod_timer(&ifmsh->mesh_path_root_timer,
 569                   round_jiffies(TU_TO_EXP_TIME(interval)));
 570 }
 571
 572 #ifdef CONFIG_PM
 573 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 574 {
 575         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 576
 577         /* use atomic bitops in case all timers fire at the same time */
 578
 579         if (del_timer_sync(&ifmsh->housekeeping_timer))
 580                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 581         if (del_timer_sync(&ifmsh->mesh_path_timer))
 582                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 583         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 584                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 585 }
 586
 587 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 588 {
 589         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 590
 591         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 592                 add_timer(&ifmsh->housekeeping_timer);
 593         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 594                 add_timer(&ifmsh->mesh_path_timer);
 595         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 596                 add_timer(&ifmsh->mesh_path_root_timer);
 597         ieee80211_mesh_root_setup(ifmsh);
 598 }
 599 #endif
 600
 601 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 602 {
 603         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 604         struct ieee80211_local *local = sdata->local;
 605         u32 changed = BSS_CHANGED_BEACON |
 606                       BSS_CHANGED_BEACON_ENABLED |
 607                       BSS_CHANGED_HT |
 608                       BSS_CHANGED_BASIC_RATES |
 609                       BSS_CHANGED_BEACON_INT;
 610         enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
 611
 612         local->fif_other_bss++;
 613         /* mesh ifaces must set allmulti to forward mcast traffic */
 614         atomic_inc(&local->iff_allmultis);
 615         ieee80211_configure_filter(local);
 616
 617         ifmsh->mesh_cc_id = 0;  /* Disabled */
 618         ifmsh->mesh_auth_id = 0;        /* Disabled */
 619         /* register sync ops from extensible synchronization framework */
 620         ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
 621         ifmsh->adjusting_tbtt = false;
 622         ifmsh->sync_offset_clockdrift_max = 0;
 623         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 624         ieee80211_mesh_root_setup(ifmsh);
 625         ieee80211_queue_work(&local->hw, &sdata->work);
 626         sdata->vif.bss_conf.ht_operation_mode =
 627                                 ifmsh->mshcfg.ht_opmode;
 628         sdata->vif.bss_conf.enable_beacon = true;
 629         sdata->vif.bss_conf.basic_rates =
 630                 ieee80211_mandatory_rates(local, band);
 631
 632         if (band == IEEE80211_BAND_5GHZ) {
 633                 sdata->vif.bss_conf.use_short_slot = true;
 634                 changed |= BSS_CHANGED_ERP_SLOT;
 635         }
 636
 637         ieee80211_bss_info_change_notify(sdata, changed);
 638
 639         netif_carrier_on(sdata->dev);
 640 }
 641
 642 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 643 {
 644         struct ieee80211_local *local = sdata->local;
 645         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 646
 647         netif_carrier_off(sdata->dev);
 648
 649         /* stop the beacon */
 650         ifmsh->mesh_id_len = 0;
 651         sdata->vif.bss_conf.enable_beacon = false;
 652         clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
 653         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 654
 655         /* flush STAs and mpaths on this iface */
 656         sta_info_flush(sdata);
 657         mesh_path_flush_by_iface(sdata);
 658
 659         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 660         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 661         del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 662         /*
 663          * If the timer fired while we waited for it, it will have
 664          * requeued the work. Now the work will be running again
 665          * but will not rearm the timer again because it checks
 666          * whether the interface is running, which, at this point,
 667          * it no longer is.
 668          */
 669         cancel_work_sync(&sdata->work);
 670
 671         local->fif_other_bss--;
 672         atomic_dec(&local->iff_allmultis);
 673         ieee80211_configure_filter(local);
 674
 675         sdata->u.mesh.timers_running = 0;
 676 }
 677
 678 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 679                                         u16 stype,
 680                                         struct ieee80211_mgmt *mgmt,
 681                                         size_t len,
 682                                         struct ieee80211_rx_status *rx_status)
 683 {
 684         struct ieee80211_local *local = sdata->local;
 685         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 686         struct ieee802_11_elems elems;
 687         struct ieee80211_channel *channel;
 688         size_t baselen;
 689         int freq;
 690         enum ieee80211_band band = rx_status->band;
 691
 692         /* ignore ProbeResp to foreign address */
 693         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 694             !ether_addr_equal(mgmt->da, sdata->vif.addr))
 695                 return;
 696
 697         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 698         if (baselen > len)
 699                 return;
 700
 701         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 702                                &elems);
 703
 704         /* ignore non-mesh or secure / unsecure mismatch */
 705         if ((!elems.mesh_id || !elems.mesh_config) ||
 706             (elems.rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
 707             (!elems.rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
 708                 return;
 709
 710         if (elems.ds_params && elems.ds_params_len == 1)
 711                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 712         else
 713                 freq = rx_status->freq;
 714
 715         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 716
 717         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 718                 return;
 719
 720         if (mesh_matches_local(sdata, &elems))
 721                 mesh_neighbour_update(sdata, mgmt->sa, &elems);
 722
 723         if (ifmsh->sync_ops)
 724                 ifmsh->sync_ops->rx_bcn_presp(sdata,
 725                         stype, mgmt, &elems, rx_status);
 726 }
 727
 728 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 729                                           struct ieee80211_mgmt *mgmt,
 730                                           size_t len,
 731                                           struct ieee80211_rx_status *rx_status)
 732 {
 733         switch (mgmt->u.action.category) {
 734         case WLAN_CATEGORY_SELF_PROTECTED:
 735                 switch (mgmt->u.action.u.self_prot.action_code) {
 736                 case WLAN_SP_MESH_PEERING_OPEN:
 737                 case WLAN_SP_MESH_PEERING_CLOSE:
 738                 case WLAN_SP_MESH_PEERING_CONFIRM:
 739                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 740                         break;
 741                 }
 742                 break;
 743         case WLAN_CATEGORY_MESH_ACTION:
 744                 if (mesh_action_is_path_sel(mgmt))
 745                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 746                 break;
 747         }
 748 }
 749
 750 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 751                                    struct sk_buff *skb)
 752 {
 753         struct ieee80211_rx_status *rx_status;
 754         struct ieee80211_mgmt *mgmt;
 755         u16 stype;
 756
 757         rx_status = IEEE80211_SKB_RXCB(skb);
 758         mgmt = (struct ieee80211_mgmt *) skb->data;
 759         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 760
 761         switch (stype) {
 762         case IEEE80211_STYPE_PROBE_RESP:
 763         case IEEE80211_STYPE_BEACON:
 764                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 765                                             rx_status);
 766                 break;
 767         case IEEE80211_STYPE_ACTION:
 768                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 769                 break;
 770         }
 771 }
 772
 773 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 774 {
 775         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 776
 777         if (ifmsh->preq_queue_len &&
 778             time_after(jiffies,
 779                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 780                 mesh_path_start_discovery(sdata);
 781
 782         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 783                 mesh_mpath_table_grow();
 784
 785         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 786                 mesh_mpp_table_grow();
 787
 788         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 789                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 790
 791         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 792                 ieee80211_mesh_rootpath(sdata);
 793
 794         if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
 795                 mesh_sync_adjust_tbtt(sdata);
 796 }
 797
 798 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 799 {
 800         struct ieee80211_sub_if_data *sdata;
 801
 802         rcu_read_lock();
 803         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 804                 if (ieee80211_vif_is_mesh(&sdata->vif))
 805                         ieee80211_queue_work(&local->hw, &sdata->work);
 806         rcu_read_unlock();
 807 }
 808
 809 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 810 {
 811         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 812         static u8 zero_addr[ETH_ALEN] = {};
 813
 814         setup_timer(&ifmsh->housekeeping_timer,
 815                     ieee80211_mesh_housekeeping_timer,
 816                     (unsigned long) sdata);
 817
 818         ifmsh->accepting_plinks = true;
 819         ifmsh->preq_id = 0;
 820         ifmsh->sn = 0;
 821         ifmsh->num_gates = 0;
 822         atomic_set(&ifmsh->mpaths, 0);
 823         mesh_rmc_init(sdata);
 824         ifmsh->last_preq = jiffies;
 825         ifmsh->next_perr = jiffies;
 826         /* Allocate all mesh structures when creating the first mesh interface. */
 827         if (!mesh_allocated)
 828                 ieee80211s_init();
 829         setup_timer(&ifmsh->mesh_path_timer,
 830                     ieee80211_mesh_path_timer,
 831                     (unsigned long) sdata);
 832         setup_timer(&ifmsh->mesh_path_root_timer,
 833                     ieee80211_mesh_path_root_timer,
 834                     (unsigned long) sdata);
 835         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 836         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 837         spin_lock_init(&ifmsh->sync_offset_lock);
 838
 839         sdata->vif.bss_conf.bssid = zero_addr;
 840 }