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
  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                 return true;
  98
  99         return false;
 100 }
 101
 102 /**
 103  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
 104  *
 105  * @ie: information elements of a management frame from the mesh peer
 106  */
 107 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 108 {
 109         return (ie->mesh_config->meshconf_cap &
 110             MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 111 }
 112
 113 /**
 114  * mesh_accept_plinks_update: update accepting_plink in local mesh beacons
 115  *
 116  * @sdata: mesh interface in which mesh beacons are going to be updated
 117  */
 118 void mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 119 {
 120         bool free_plinks;
 121
 122         /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
 123          * the mesh interface might be able to establish plinks with peers that
 124          * are already on the table but are not on PLINK_ESTAB state. However,
 125          * in general the mesh interface is not accepting peer link requests
 126          * from new peers, and that must be reflected in the beacon
 127          */
 128         free_plinks = mesh_plink_availables(sdata);
 129
 130         if (free_plinks != sdata->u.mesh.accepting_plinks)
 131                 ieee80211_mesh_housekeeping_timer((unsigned long) sdata);
 132 }
 133
 134 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 135 {
 136         int i;
 137
 138         sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
 139         if (!sdata->u.mesh.rmc)
 140                 return -ENOMEM;
 141         sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
 142         for (i = 0; i < RMC_BUCKETS; i++)
 143                 INIT_LIST_HEAD(&sdata->u.mesh.rmc->bucket[i].list);
 144         return 0;
 145 }
 146
 147 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 148 {
 149         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 150         struct rmc_entry *p, *n;
 151         int i;
 152
 153         if (!sdata->u.mesh.rmc)
 154                 return;
 155
 156         for (i = 0; i < RMC_BUCKETS; i++)
 157                 list_for_each_entry_safe(p, n, &rmc->bucket[i].list, list) {
 158                         list_del(&p->list);
 159                         kmem_cache_free(rm_cache, p);
 160                 }
 161
 162         kfree(rmc);
 163         sdata->u.mesh.rmc = NULL;
 164 }
 165
 166 /**
 167  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
 168  *
 169  * @sa:         source address
 170  * @mesh_hdr:   mesh_header
 171  *
 172  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
 173  *
 174  * Checks using the source address and the mesh sequence number if we have
 175  * received this frame lately. If the frame is not in the cache, it is added to
 176  * it.
 177  */
 178 int mesh_rmc_check(u8 *sa, struct ieee80211s_hdr *mesh_hdr,
 179                    struct ieee80211_sub_if_data *sdata)
 180 {
 181         struct mesh_rmc *rmc = sdata->u.mesh.rmc;
 182         u32 seqnum = 0;
 183         int entries = 0;
 184         u8 idx;
 185         struct rmc_entry *p, *n;
 186
 187         /* Don't care about endianness since only match matters */
 188         memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
 189         idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
 190         list_for_each_entry_safe(p, n, &rmc->bucket[idx].list, list) {
 191                 ++entries;
 192                 if (time_after(jiffies, p->exp_time) ||
 193                                 (entries == RMC_QUEUE_MAX_LEN)) {
 194                         list_del(&p->list);
 195                         kmem_cache_free(rm_cache, p);
 196                         --entries;
 197                 } else if ((seqnum == p->seqnum) &&
 198                            (memcmp(sa, p->sa, ETH_ALEN) == 0))
 199                         return -1;
 200         }
 201
 202         p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
 203         if (!p) {
 204                 printk(KERN_DEBUG "o11s: could not allocate RMC entry\n");
 205                 return 0;
 206         }
 207         p->seqnum = seqnum;
 208         p->exp_time = jiffies + RMC_TIMEOUT;
 209         memcpy(p->sa, sa, ETH_ALEN);
 210         list_add(&p->list, &rmc->bucket[idx].list);
 211         return 0;
 212 }
 213
 214 int
 215 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 216 {
 217         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 218         u8 *pos, neighbors;
 219         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 220
 221         if (skb_tailroom(skb) < 2 + meshconf_len)
 222                 return -ENOMEM;
 223
 224         pos = skb_put(skb, 2 + meshconf_len);
 225         *pos++ = WLAN_EID_MESH_CONFIG;
 226         *pos++ = meshconf_len;
 227
 228         /* Active path selection protocol ID */
 229         *pos++ = ifmsh->mesh_pp_id;
 230         /* Active path selection metric ID   */
 231         *pos++ = ifmsh->mesh_pm_id;
 232         /* Congestion control mode identifier */
 233         *pos++ = ifmsh->mesh_cc_id;
 234         /* Synchronization protocol identifier */
 235         *pos++ = ifmsh->mesh_sp_id;
 236         /* Authentication Protocol identifier */
 237         *pos++ = ifmsh->mesh_auth_id;
 238         /* Mesh Formation Info - number of neighbors */
 239         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 240         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 241         neighbors = (neighbors > 15) ? 15 : neighbors;
 242         *pos++ = neighbors << 1;
 243         /* Mesh capability */
 244         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 245         *pos = MESHCONF_CAPAB_FORWARDING;
 246         *pos++ |= ifmsh->accepting_plinks ?
 247             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 248         *pos++ = 0x00;
 249
 250         return 0;
 251 }
 252
 253 int
 254 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 255 {
 256         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 257         u8 *pos;
 258
 259         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 260                 return -ENOMEM;
 261
 262         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 263         *pos++ = WLAN_EID_MESH_ID;
 264         *pos++ = ifmsh->mesh_id_len;
 265         if (ifmsh->mesh_id_len)
 266                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 267
 268         return 0;
 269 }
 270
 271 int
 272 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 273 {
 274         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 275         u8 offset, len;
 276         const u8 *data;
 277
 278         if (!ifmsh->ie || !ifmsh->ie_len)
 279                 return 0;
 280
 281         /* fast-forward to vendor IEs */
 282         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 283
 284         if (offset) {
 285                 len = ifmsh->ie_len - offset;
 286                 data = ifmsh->ie + offset;
 287                 if (skb_tailroom(skb) < len)
 288                         return -ENOMEM;
 289                 memcpy(skb_put(skb, len), data, len);
 290         }
 291
 292         return 0;
 293 }
 294
 295 int
 296 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 297 {
 298         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 299         u8 len = 0;
 300         const u8 *data;
 301
 302         if (!ifmsh->ie || !ifmsh->ie_len)
 303                 return 0;
 304
 305         /* find RSN IE */
 306         data = ifmsh->ie;
 307         while (data < ifmsh->ie + ifmsh->ie_len) {
 308                 if (*data == WLAN_EID_RSN) {
 309                         len = data[1] + 2;
 310                         break;
 311                 }
 312                 data++;
 313         }
 314
 315         if (len) {
 316                 if (skb_tailroom(skb) < len)
 317                         return -ENOMEM;
 318                 memcpy(skb_put(skb, len), data, len);
 319         }
 320
 321         return 0;
 322 }
 323
 324 int
 325 mesh_add_srates_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 326 {
 327         struct ieee80211_local *local = sdata->local;
 328         struct ieee80211_supported_band *sband;
 329         int rate;
 330         u8 i, rates, *pos;
 331
 332         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 333         rates = sband->n_bitrates;
 334         if (rates > 8)
 335                 rates = 8;
 336
 337         if (skb_tailroom(skb) < rates + 2)
 338                 return -ENOMEM;
 339
 340         pos = skb_put(skb, rates + 2);
 341         *pos++ = WLAN_EID_SUPP_RATES;
 342         *pos++ = rates;
 343         for (i = 0; i < rates; i++) {
 344                 rate = sband->bitrates[i].bitrate;
 345                 *pos++ = (u8) (rate / 5);
 346         }
 347
 348         return 0;
 349 }
 350
 351 int
 352 mesh_add_ext_srates_ie(struct sk_buff *skb,
 353                        struct ieee80211_sub_if_data *sdata)
 354 {
 355         struct ieee80211_local *local = sdata->local;
 356         struct ieee80211_supported_band *sband;
 357         int rate;
 358         u8 i, exrates, *pos;
 359
 360         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 361         exrates = sband->n_bitrates;
 362         if (exrates > 8)
 363                 exrates -= 8;
 364         else
 365                 exrates = 0;
 366
 367         if (skb_tailroom(skb) < exrates + 2)
 368                 return -ENOMEM;
 369
 370         if (exrates) {
 371                 pos = skb_put(skb, exrates + 2);
 372                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 373                 *pos++ = exrates;
 374                 for (i = 8; i < sband->n_bitrates; i++) {
 375                         rate = sband->bitrates[i].bitrate;
 376                         *pos++ = (u8) (rate / 5);
 377                 }
 378         }
 379         return 0;
 380 }
 381
 382 int mesh_add_ds_params_ie(struct sk_buff *skb,
 383                           struct ieee80211_sub_if_data *sdata)
 384 {
 385         struct ieee80211_local *local = sdata->local;
 386         struct ieee80211_supported_band *sband;
 387         u8 *pos;
 388
 389         if (skb_tailroom(skb) < 3)
 390                 return -ENOMEM;
 391
 392         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 393         if (sband->band == IEEE80211_BAND_2GHZ) {
 394                 pos = skb_put(skb, 2 + 1);
 395                 *pos++ = WLAN_EID_DS_PARAMS;
 396                 *pos++ = 1;
 397                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 398         }
 399
 400         return 0;
 401 }
 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 |
 468                                 IEEE80211_FCTL_TODS);
 469                 /* RA TA DA SA */
 470                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 471                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 472                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 473                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 474                 return 30;
 475         }
 476 }
 477
 478 /**
 479  * ieee80211_new_mesh_header - create a new mesh header
 480  * @meshhdr:    uninitialized mesh header
 481  * @sdata:      mesh interface to be used
 482  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 483  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 484  *              be NULL.
 485  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 486  *              mesh frame
 487  *
 488  * Return the header length.
 489  */
 490 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 491                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 492                 char *addr6)
 493 {
 494         int aelen = 0;
 495         BUG_ON(!addr4or5 && addr6);
 496         memset(meshhdr, 0, sizeof(*meshhdr));
 497         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 498         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 499         sdata->u.mesh.mesh_seqnum++;
 500         if (addr4or5 && !addr6) {
 501                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 502                 aelen += ETH_ALEN;
 503                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 504         } else if (addr4or5 && addr6) {
 505                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 506                 aelen += 2 * ETH_ALEN;
 507                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 508                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 509         }
 510         return 6 + aelen;
 511 }
 512
 513 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 514                            struct ieee80211_if_mesh *ifmsh)
 515 {
 516         bool free_plinks;
 517
 518 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 519         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 520                sdata->name);
 521 #endif
 522
 523         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 524         mesh_path_expire(sdata);
 525
 526         free_plinks = mesh_plink_availables(sdata);
 527         if (free_plinks != sdata->u.mesh.accepting_plinks)
 528                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 529
 530         mod_timer(&ifmsh->housekeeping_timer,
 531                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 532 }
 533
 534 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 535 {
 536         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 537
 538         mesh_path_tx_root_frame(sdata);
 539         mod_timer(&ifmsh->mesh_path_root_timer,
 540                   round_jiffies(TU_TO_EXP_TIME(
 541                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 542 }
 543
 544 #ifdef CONFIG_PM
 545 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 546 {
 547         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 548
 549         /* use atomic bitops in case all timers fire at the same time */
 550
 551         if (del_timer_sync(&ifmsh->housekeeping_timer))
 552                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 553         if (del_timer_sync(&ifmsh->mesh_path_timer))
 554                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 555         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 556                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 557 }
 558
 559 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 560 {
 561         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 562
 563         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 564                 add_timer(&ifmsh->housekeeping_timer);
 565         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 566                 add_timer(&ifmsh->mesh_path_timer);
 567         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 568                 add_timer(&ifmsh->mesh_path_root_timer);
 569         ieee80211_mesh_root_setup(ifmsh);
 570 }
 571 #endif
 572
 573 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 574 {
 575         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 576         struct ieee80211_local *local = sdata->local;
 577
 578         local->fif_other_bss++;
 579         /* mesh ifaces must set allmulti to forward mcast traffic */
 580         atomic_inc(&local->iff_allmultis);
 581         ieee80211_configure_filter(local);
 582
 583         ifmsh->mesh_cc_id = 0;  /* Disabled */
 584         ifmsh->mesh_sp_id = 0;  /* Neighbor Offset */
 585         ifmsh->mesh_auth_id = 0;        /* Disabled */
 586         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 587         ieee80211_mesh_root_setup(ifmsh);
 588         ieee80211_queue_work(&local->hw, &sdata->work);
 589         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 590         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 591                                                 BSS_CHANGED_BEACON_ENABLED |
 592                                                 BSS_CHANGED_BEACON_INT);
 593 }
 594
 595 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 596 {
 597         struct ieee80211_local *local = sdata->local;
 598         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 599
 600         ifmsh->mesh_id_len = 0;
 601         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 602         sta_info_flush(local, NULL);
 603
 604         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 605         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 606         /*
 607          * If the timer fired while we waited for it, it will have
 608          * requeued the work. Now the work will be running again
 609          * but will not rearm the timer again because it checks
 610          * whether the interface is running, which, at this point,
 611          * it no longer is.
 612          */
 613         cancel_work_sync(&sdata->work);
 614
 615         local->fif_other_bss--;
 616         atomic_dec(&local->iff_allmultis);
 617         ieee80211_configure_filter(local);
 618 }
 619
 620 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 621                                         u16 stype,
 622                                         struct ieee80211_mgmt *mgmt,
 623                                         size_t len,
 624                                         struct ieee80211_rx_status *rx_status)
 625 {
 626         struct ieee80211_local *local = sdata->local;
 627         struct ieee802_11_elems elems;
 628         struct ieee80211_channel *channel;
 629         u32 supp_rates = 0;
 630         size_t baselen;
 631         int freq;
 632         enum ieee80211_band band = rx_status->band;
 633
 634         /* ignore ProbeResp to foreign address */
 635         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 636             compare_ether_addr(mgmt->da, sdata->vif.addr))
 637                 return;
 638
 639         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 640         if (baselen > len)
 641                 return;
 642
 643         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 644                                &elems);
 645
 646         /* ignore beacons from secure mesh peers if our security is off */
 647         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 648                 return;
 649
 650         if (elems.ds_params && elems.ds_params_len == 1)
 651                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 652         else
 653                 freq = rx_status->freq;
 654
 655         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 656
 657         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 658                 return;
 659
 660         if (elems.mesh_id && elems.mesh_config &&
 661             mesh_matches_local(&elems, sdata)) {
 662                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 663                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata, &elems);
 664         }
 665 }
 666
 667 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 668                                           struct ieee80211_mgmt *mgmt,
 669                                           size_t len,
 670                                           struct ieee80211_rx_status *rx_status)
 671 {
 672         switch (mgmt->u.action.category) {
 673         case WLAN_CATEGORY_SELF_PROTECTED:
 674                 switch (mgmt->u.action.u.self_prot.action_code) {
 675                 case WLAN_SP_MESH_PEERING_OPEN:
 676                 case WLAN_SP_MESH_PEERING_CLOSE:
 677                 case WLAN_SP_MESH_PEERING_CONFIRM:
 678                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 679                         break;
 680                 }
 681                 break;
 682         case WLAN_CATEGORY_MESH_ACTION:
 683                 if (mesh_action_is_path_sel(mgmt))
 684                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 685                 break;
 686         }
 687 }
 688
 689 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 690                                    struct sk_buff *skb)
 691 {
 692         struct ieee80211_rx_status *rx_status;
 693         struct ieee80211_mgmt *mgmt;
 694         u16 stype;
 695
 696         rx_status = IEEE80211_SKB_RXCB(skb);
 697         mgmt = (struct ieee80211_mgmt *) skb->data;
 698         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 699
 700         switch (stype) {
 701         case IEEE80211_STYPE_PROBE_RESP:
 702         case IEEE80211_STYPE_BEACON:
 703                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 704                                             rx_status);
 705                 break;
 706         case IEEE80211_STYPE_ACTION:
 707                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 708                 break;
 709         }
 710 }
 711
 712 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 713 {
 714         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 715
 716         if (ifmsh->preq_queue_len &&
 717             time_after(jiffies,
 718                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 719                 mesh_path_start_discovery(sdata);
 720
 721         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 722                 mesh_mpath_table_grow();
 723
 724         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 725                 mesh_mpp_table_grow();
 726
 727         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 728                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 729
 730         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 731                 ieee80211_mesh_rootpath(sdata);
 732 }
 733
 734 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 735 {
 736         struct ieee80211_sub_if_data *sdata;
 737
 738         rcu_read_lock();
 739         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 740                 if (ieee80211_vif_is_mesh(&sdata->vif))
 741                         ieee80211_queue_work(&local->hw, &sdata->work);
 742         rcu_read_unlock();
 743 }
 744
 745 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 746 {
 747         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 748
 749         setup_timer(&ifmsh->housekeeping_timer,
 750                     ieee80211_mesh_housekeeping_timer,
 751                     (unsigned long) sdata);
 752
 753         ifmsh->accepting_plinks = true;
 754         ifmsh->preq_id = 0;
 755         ifmsh->sn = 0;
 756         ifmsh->num_gates = 0;
 757         atomic_set(&ifmsh->mpaths, 0);
 758         mesh_rmc_init(sdata);
 759         ifmsh->last_preq = jiffies;
 760         /* Allocate all mesh structures when creating the first mesh interface. */
 761         if (!mesh_allocated)
 762                 ieee80211s_init();
 763         setup_timer(&ifmsh->mesh_path_timer,
 764                     ieee80211_mesh_path_timer,
 765                     (unsigned long) sdata);
 766         setup_timer(&ifmsh->mesh_path_root_timer,
 767                     ieee80211_mesh_path_root_timer,
 768                     (unsigned long) sdata);
 769         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 770         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 771 }