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 MESHCONF_CAPAB_ACCEPT_PLINKS 0x01
  17 #define MESHCONF_CAPAB_FORWARDING    0x08
  18
  19 #define TMR_RUNNING_HK  0
  20 #define TMR_RUNNING_MP  1
  21 #define TMR_RUNNING_MPR 2
  22
  23 int mesh_allocated;
  24 static struct kmem_cache *rm_cache;
  25
  26 #ifdef CONFIG_MAC80211_MESH
  27 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  28 {
  29         return (mgmt->u.action.u.mesh_action.action_code ==
  30                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
  31 }
  32 #else
  33 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
  34 { return false; }
  35 #endif
  36
  37 void ieee80211s_init(void)
  38 {
  39         mesh_pathtbl_init();
  40         mesh_allocated = 1;
  41         rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
  42                                      0, 0, NULL);
  43 }
  44
  45 void ieee80211s_stop(void)
  46 {
  47         mesh_pathtbl_unregister();
  48         kmem_cache_destroy(rm_cache);
  49 }
  50
  51 static void ieee80211_mesh_housekeeping_timer(unsigned long data)
  52 {
  53         struct ieee80211_sub_if_data *sdata = (void *) data;
  54         struct ieee80211_local *local = sdata->local;
  55         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  56
  57         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
  58
  59         if (local->quiescing) {
  60                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
  61                 return;
  62         }
  63
  64         ieee80211_queue_work(&local->hw, &sdata->work);
  65 }
  66
  67 /**
  68  * mesh_matches_local - check if the config of a mesh point matches ours
  69  *
  70  * @ie: information elements of a management frame from the mesh peer
  71  * @sdata: local mesh subif
  72  *
  73  * This function checks if the mesh configuration of a mesh point matches the
  74  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  75  */
  76 bool mesh_matches_local(struct ieee802_11_elems *ie, struct ieee80211_sub_if_data *sdata)
  77 {
  78         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
  79         struct ieee80211_local *local = sdata->local;
  80
  81         /*
  82          * As support for each feature is added, check for matching
  83          * - On mesh config capabilities
  84          *   - Power Save Support En
  85          *   - Sync support enabled
  86          *   - Sync support active
  87          *   - Sync support required from peer
  88          *   - MDA enabled
  89          * - Power management control on fc
  90          */
  91         if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
  92              memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
  93              (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
  94              (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
  95              (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
  96              (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
  97              (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
  98                 goto mismatch;
  99
 100         /* disallow peering with mismatched channel types for now */
 101         if (ie->ht_info_elem &&
 102             (local->_oper_channel_type !=
 103              ieee80211_ht_info_to_channel_type(ie->ht_info_elem)))
 104                 goto mismatch;
 105
 106         return true;
 107 mismatch:
 108         return false;
 109 }
 110
 111 /**
 112  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 113  *
 114  * @ie: information elements of a management frame from the mesh peer
 115  */
 116 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 117 {
 118         return (ie->mesh_config->meshconf_cap &
 119             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 120 }
 121
 122 /**
 123  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 124  *
 125  * @sdata: mesh interface in which mesh beacons are going to be updated
 126  */
 127 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 128 {
 129         bool free_plinks;
 130
 131         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 132          * the mesh interface might be able to establish plinks with peers that
 133          * are already on the table but are not on PLINK_ESTAB state. However,
 134          * in general the mesh interface is not accepting peer link requests
 135          * from new peers, and that must be reflected in the beacon
 136          */
 137         free_plinks = mesh_plink_availables(sdata);
 138
 139         if (free_plinks != sdata->u.mesh.accepting_plinks)
 140                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 141 }
 142
 143 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 144 {
 145         int i;
 146
 147         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 148         if (!sdata->u.mesh.rmc)
 149                 return -ENOMEM;
 150         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 151         for (i = 0; i < RMC_BUCKETS; i++)
 152                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 153         return 0;
 154 }
 155
 156 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 157 {
 158         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 159         struct rmc_entry *p, *n;
 160         int i;
 161
 162         if (!sdata->u.mesh.rmc)
 163                 return;
 164
 165         for (i = 0; i < RMC_BUCKETS; i++)
 166                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 167                         list_del(&p->list);
 168                         kmem_cache_free(rm_cache, p);
 169                 }
 170
 171         kfree(rmc);
 172         sdata->u.mesh.rmc = NULL;
 173 }
 174
 175 /**
 176  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 177  *
 178  * @sa:         source address
 179  * @mesh_hdr:   mesh_header
 180  *
 181  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 182  *
 183  * Checks using the source address and the mesh sequence number if we have
 184  * received this frame lately. If the frame is not in the cache, it is added to
 185  * it.
 186  */
 187 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 188                    struct ieee80211_sub_if_data *sdata)
 189 {
 190         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 191         u32 seqnum = 0;
 192         int entries = 0;
 193         u8 idx;
 194         struct rmc_entry *p, *n;
 195
 196         /* Don't care about endianness since only match matters */
 197         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 198         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 199         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 200                 ++entries;
 201                 if (time_after(jiffies, p->exp_time) ||
 202                                 (entries == RMC_QUEUE_MAX_LEN)) {
 203                         list_del(&p->list);
 204                         kmem_cache_free(rm_cache, p);
 205                         --entries;
 206                 } else if ((seqnum == p->seqnum) &&
 207                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
 208                         return -1;
 209         }
 210
 211         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 212         if (!p)
 213                 return 0;
 214
 215         p->seqnum = seqnum;
 216         p->exp_time = jiffies + RMC_TIMEOUT;
 217         memcpy(p->sa, sa, ETH_ALEN);
 218         list_add(&p->list, &rmc->bucket[idx].list);
 219         return 0;
 220 }
 221
 222 int
 223 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 224 {
 225         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 226         u8 *pos, neighbors;
 227         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 228
 229         if (skb_tailroom(skb) < 2 + meshconf_len)
 230                 return -ENOMEM;
 231
 232         pos = skb_put(skb, 2 + meshconf_len);
 233         *pos++ = WLAN_EID_MESH_CONFIG;
 234         *pos++ = meshconf_len;
 235
 236         /* Active path selection protocol ID */
 237         *pos++ = ifmsh->mesh_pp_id;
 238         /* Active path selection metric ID   */
 239         *pos++ = ifmsh->mesh_pm_id;
 240         /* Congestion control mode identifier */
 241         *pos++ = ifmsh->mesh_cc_id;
 242         /* Synchronization protocol identifier */
 243         *pos++ = ifmsh->mesh_sp_id;
 244         /* Authentication Protocol identifier */
 245         *pos++ = ifmsh->mesh_auth_id;
 246         /* Mesh Formation Info - number of neighbors */
 247         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 248         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 249         neighbors = (neighbors > 15) ? 15 : neighbors;
 250         *pos++ = neighbors << 1;
 251         /* Mesh capability */
 252         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 253         *pos = MESHCONF_CAPAB_FORWARDING;
 254         *pos++ |= ifmsh->accepting_plinks ?
 255             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 256         *pos++ = 0x00;
 257
 258         return 0;
 259 }
 260
 261 int
 262 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 263 {
 264         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 265         u8 *pos;
 266
 267         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 268                 return -ENOMEM;
 269
 270         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 271         *pos++ = WLAN_EID_MESH_ID;
 272         *pos++ = ifmsh->mesh_id_len;
 273         if (ifmsh->mesh_id_len)
 274                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 275
 276         return 0;
 277 }
 278
 279 int
 280 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 281 {
 282         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 283         u8 offset, len;
 284         const u8 *data;
 285
 286         if (!ifmsh->ie || !ifmsh->ie_len)
 287                 return 0;
 288
 289         /* fast-forward to vendor IEs */
 290         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 291
 292         if (offset) {
 293                 len = ifmsh->ie_len - offset;
 294                 data = ifmsh->ie + offset;
 295                 if (skb_tailroom(skb) < len)
 296                         return -ENOMEM;
 297                 memcpy(skb_put(skb, len), data, len);
 298         }
 299
 300         return 0;
 301 }
 302
 303 int
 304 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 305 {
 306         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 307         u8 len = 0;
 308         const u8 *data;
 309
 310         if (!ifmsh->ie || !ifmsh->ie_len)
 311                 return 0;
 312
 313         /* find RSN IE */
 314         data = ifmsh->ie;
 315         while (data < ifmsh->ie + ifmsh->ie_len) {
 316                 if (*data == WLAN_EID_RSN) {
 317                         len = data[1] + 2;
 318                         break;
 319                 }
 320                 data++;
 321         }
 322
 323         if (len) {
 324                 if (skb_tailroom(skb) < len)
 325                         return -ENOMEM;
 326                 memcpy(skb_put(skb, len), data, len);
 327         }
 328
 329         return 0;
 330 }
 331
 332 int mesh_add_ds_params_ie(struct sk_buff *skb,
 333                           struct ieee80211_sub_if_data *sdata)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         struct ieee80211_supported_band *sband;
 337         u8 *pos;
 338
 339         if (skb_tailroom(skb) < 3)
 340                 return -ENOMEM;
 341
 342         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 343         if (sband->band == IEEE80211_BAND_2GHZ) {
 344                 pos = skb_put(skb, 2 + 1);
 345                 *pos++ = WLAN_EID_DS_PARAMS;
 346                 *pos++ = 1;
 347                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 348         }
 349
 350         return 0;
 351 }
 352
 353 int mesh_add_ht_cap_ie(struct sk_buff *skb,
 354                        struct ieee80211_sub_if_data *sdata)
 355 {
 356         struct ieee80211_local *local = sdata->local;
 357         struct ieee80211_supported_band *sband;
 358         u8 *pos;
 359
 360         sband = local->hw.wiphy->bands[local->oper_channel->band];
 361         if (!sband->ht_cap.ht_supported ||
 362             local->_oper_channel_type == NL80211_CHAN_NO_HT)
 363                 return 0;
 364
 365         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
 366                 return -ENOMEM;
 367
 368         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
 369         ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 370
 371         return 0;
 372 }
 373
 374 int mesh_add_ht_info_ie(struct sk_buff *skb,
 375                         struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         struct ieee80211_channel *channel = local->oper_channel;
 379         enum nl80211_channel_type channel_type = local->_oper_channel_type;
 380         struct ieee80211_supported_band *sband =
 381                                 local->hw.wiphy->bands[channel->band];
 382         struct ieee80211_sta_ht_cap *ht_cap = &sband->ht_cap;
 383         u8 *pos;
 384
 385         if (!ht_cap->ht_supported || channel_type == NL80211_CHAN_NO_HT)
 386                 return 0;
 387
 388         if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_info))
 389                 return -ENOMEM;
 390
 391         pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_info));
 392         ieee80211_ie_build_ht_info(pos, ht_cap, channel, channel_type);
 393
 394         return 0;
 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 | IEEE80211_FCTL_TODS);
 461                 /* RA TA DA SA */
 462                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 463                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 464                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 465                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 466                 return 30;
 467         }
 468 }
 469
 470 /**
 471  * ieee80211_new_mesh_header - create a new mesh header
 472  * @meshhdr:    uninitialized mesh header
 473  * @sdata:      mesh interface to be used
 474  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 475  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 476  *              be NULL.
 477  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 478  *              mesh frame
 479  *
 480  * Return the header length.
 481  */
 482 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 483                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 484                 char *addr6)
 485 {
 486         int aelen = 0;
 487         BUG_ON(!addr4or5 && addr6);
 488         memset(meshhdr, 0, sizeof(*meshhdr));
 489         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 490         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 491         sdata->u.mesh.mesh_seqnum++;
 492         if (addr4or5 && !addr6) {
 493                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 494                 aelen += ETH_ALEN;
 495                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 496         } else if (addr4or5 && addr6) {
 497                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 498                 aelen += 2 * ETH_ALEN;
 499                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 500                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 501         }
 502         return 6 + aelen;
 503 }
 504
 505 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 506                            struct ieee80211_if_mesh *ifmsh)
 507 {
 508         bool free_plinks;
 509
 510 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 511         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 512                sdata->name);
 513 #endif
 514
 515         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 516         mesh_path_expire(sdata);
 517
 518         free_plinks = mesh_plink_availables(sdata);
 519         if (free_plinks != sdata->u.mesh.accepting_plinks)
 520                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 521
 522         mod_timer(&ifmsh->housekeeping_timer,
 523                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 524 }
 525
 526 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 527 {
 528         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 529
 530         mesh_path_tx_root_frame(sdata);
 531         mod_timer(&ifmsh->mesh_path_root_timer,
 532                   round_jiffies(TU_TO_EXP_TIME(
 533                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 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 all 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_ACTION:
 675                 if (mesh_action_is_path_sel(mgmt))
 676                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 677                 break;
 678         }
 679 }
 680
 681 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 682                                    struct sk_buff *skb)
 683 {
 684         struct ieee80211_rx_status *rx_status;
 685         struct ieee80211_mgmt *mgmt;
 686         u16 stype;
 687
 688         rx_status = IEEE80211_SKB_RXCB(skb);
 689         mgmt = (struct ieee80211_mgmt *) skb->data;
 690         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 691
 692         switch (stype) {
 693         case IEEE80211_STYPE_PROBE_RESP:
 694         case IEEE80211_STYPE_BEACON:
 695                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 696                                             rx_status);
 697                 break;
 698         case IEEE80211_STYPE_ACTION:
 699                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 700                 break;
 701         }
 702 }
 703
 704 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 705 {
 706         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 707
 708         if (ifmsh->preq_queue_len &&
 709             time_after(jiffies,
 710                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 711                 mesh_path_start_discovery(sdata);
 712
 713         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 714                 mesh_mpath_table_grow();
 715
 716         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 717                 mesh_mpp_table_grow();
 718
 719         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 720                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 721
 722         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 723                 ieee80211_mesh_rootpath(sdata);
 724 }
 725
 726 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 727 {
 728         struct ieee80211_sub_if_data *sdata;
 729
 730         rcu_read_lock();
 731         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 732                 if (ieee80211_vif_is_mesh(&sdata->vif))
 733                         ieee80211_queue_work(&local->hw, &sdata->work);
 734         rcu_read_unlock();
 735 }
 736
 737 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 738 {
 739         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 740
 741         setup_timer(&ifmsh->housekeeping_timer,
 742                     ieee80211_mesh_housekeeping_timer,
 743                     (unsigned long) sdata);
 744
 745         ifmsh->accepting_plinks = true;
 746         ifmsh->preq_id = 0;
 747         ifmsh->sn = 0;
 748         ifmsh->num_gates = 0;
 749         atomic_set(&ifmsh->mpaths, 0);
 750         mesh_rmc_init(sdata);
 751         ifmsh->last_preq = jiffies;
 752         ifmsh->next_perr = jiffies;
 753         /* Allocate all mesh structures when creating the first mesh interface. */
 754         if (!mesh_allocated)
 755                 ieee80211s_init();
 756         setup_timer(&ifmsh->mesh_path_timer,
 757                     ieee80211_mesh_path_timer,
 758                     (unsigned long) sdata);
 759         setup_timer(&ifmsh->mesh_path_root_timer,
 760                     ieee80211_mesh_path_root_timer,
 761                     (unsigned long) sdata);
 762         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 763         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 764 }