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                 return 0;
 205
 206         p->seqnum = seqnum;
 207         p->exp_time = jiffies + RMC_TIMEOUT;
 208         memcpy(p->sa, sa, ETH_ALEN);
 209         list_add(&p->list, &rmc->bucket[idx].list);
 210         return 0;
 211 }
 212
 213 int
 214 mesh_add_meshconf_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 215 {
 216         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 217         u8 *pos, neighbors;
 218         u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
 219
 220         if (skb_tailroom(skb) < 2 + meshconf_len)
 221                 return -ENOMEM;
 222
 223         pos = skb_put(skb, 2 + meshconf_len);
 224         *pos++ = WLAN_EID_MESH_CONFIG;
 225         *pos++ = meshconf_len;
 226
 227         /* Active path selection protocol ID */
 228         *pos++ = ifmsh->mesh_pp_id;
 229         /* Active path selection metric ID   */
 230         *pos++ = ifmsh->mesh_pm_id;
 231         /* Congestion control mode identifier */
 232         *pos++ = ifmsh->mesh_cc_id;
 233         /* Synchronization protocol identifier */
 234         *pos++ = ifmsh->mesh_sp_id;
 235         /* Authentication Protocol identifier */
 236         *pos++ = ifmsh->mesh_auth_id;
 237         /* Mesh Formation Info - number of neighbors */
 238         neighbors = atomic_read(&ifmsh->mshstats.estab_plinks);
 239         /* Number of neighbor mesh STAs or 15 whichever is smaller */
 240         neighbors = (neighbors > 15) ? 15 : neighbors;
 241         *pos++ = neighbors << 1;
 242         /* Mesh capability */
 243         ifmsh->accepting_plinks = mesh_plink_availables(sdata);
 244         *pos = MESHCONF_CAPAB_FORWARDING;
 245         *pos++ |= ifmsh->accepting_plinks ?
 246             MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
 247         *pos++ = 0x00;
 248
 249         return 0;
 250 }
 251
 252 int
 253 mesh_add_meshid_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 254 {
 255         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 256         u8 *pos;
 257
 258         if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
 259                 return -ENOMEM;
 260
 261         pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
 262         *pos++ = WLAN_EID_MESH_ID;
 263         *pos++ = ifmsh->mesh_id_len;
 264         if (ifmsh->mesh_id_len)
 265                 memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 266
 267         return 0;
 268 }
 269
 270 int
 271 mesh_add_vendor_ies(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 272 {
 273         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 274         u8 offset, len;
 275         const u8 *data;
 276
 277         if (!ifmsh->ie || !ifmsh->ie_len)
 278                 return 0;
 279
 280         /* fast-forward to vendor IEs */
 281         offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 282
 283         if (offset) {
 284                 len = ifmsh->ie_len - offset;
 285                 data = ifmsh->ie + offset;
 286                 if (skb_tailroom(skb) < len)
 287                         return -ENOMEM;
 288                 memcpy(skb_put(skb, len), data, len);
 289         }
 290
 291         return 0;
 292 }
 293
 294 int
 295 mesh_add_rsn_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 296 {
 297         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 298         u8 len = 0;
 299         const u8 *data;
 300
 301         if (!ifmsh->ie || !ifmsh->ie_len)
 302                 return 0;
 303
 304         /* find RSN IE */
 305         data = ifmsh->ie;
 306         while (data < ifmsh->ie + ifmsh->ie_len) {
 307                 if (*data == WLAN_EID_RSN) {
 308                         len = data[1] + 2;
 309                         break;
 310                 }
 311                 data++;
 312         }
 313
 314         if (len) {
 315                 if (skb_tailroom(skb) < len)
 316                         return -ENOMEM;
 317                 memcpy(skb_put(skb, len), data, len);
 318         }
 319
 320         return 0;
 321 }
 322
 323 int
 324 mesh_add_srates_ie(struct sk_buff *skb, struct ieee80211_sub_if_data *sdata)
 325 {
 326         struct ieee80211_local *local = sdata->local;
 327         struct ieee80211_supported_band *sband;
 328         int rate;
 329         u8 i, rates, *pos;
 330
 331         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 332         rates = sband->n_bitrates;
 333         if (rates > 8)
 334                 rates = 8;
 335
 336         if (skb_tailroom(skb) < rates + 2)
 337                 return -ENOMEM;
 338
 339         pos = skb_put(skb, rates + 2);
 340         *pos++ = WLAN_EID_SUPP_RATES;
 341         *pos++ = rates;
 342         for (i = 0; i < rates; i++) {
 343                 rate = sband->bitrates[i].bitrate;
 344                 *pos++ = (u8) (rate / 5);
 345         }
 346
 347         return 0;
 348 }
 349
 350 int
 351 mesh_add_ext_srates_ie(struct sk_buff *skb,
 352                        struct ieee80211_sub_if_data *sdata)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         struct ieee80211_supported_band *sband;
 356         int rate;
 357         u8 i, exrates, *pos;
 358
 359         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 360         exrates = sband->n_bitrates;
 361         if (exrates > 8)
 362                 exrates -= 8;
 363         else
 364                 exrates = 0;
 365
 366         if (skb_tailroom(skb) < exrates + 2)
 367                 return -ENOMEM;
 368
 369         if (exrates) {
 370                 pos = skb_put(skb, exrates + 2);
 371                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
 372                 *pos++ = exrates;
 373                 for (i = 8; i < sband->n_bitrates; i++) {
 374                         rate = sband->bitrates[i].bitrate;
 375                         *pos++ = (u8) (rate / 5);
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381 int mesh_add_ds_params_ie(struct sk_buff *skb,
 382                           struct ieee80211_sub_if_data *sdata)
 383 {
 384         struct ieee80211_local *local = sdata->local;
 385         struct ieee80211_supported_band *sband;
 386         u8 *pos;
 387
 388         if (skb_tailroom(skb) < 3)
 389                 return -ENOMEM;
 390
 391         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 392         if (sband->band == IEEE80211_BAND_2GHZ) {
 393                 pos = skb_put(skb, 2 + 1);
 394                 *pos++ = WLAN_EID_DS_PARAMS;
 395                 *pos++ = 1;
 396                 *pos++ = ieee80211_frequency_to_channel(local->hw.conf.channel->center_freq);
 397         }
 398
 399         return 0;
 400 }
 401
 402 static void ieee80211_mesh_path_timer(unsigned long data)
 403 {
 404         struct ieee80211_sub_if_data *sdata =
 405                 (struct ieee80211_sub_if_data *) data;
 406         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 407         struct ieee80211_local *local = sdata->local;
 408
 409         if (local->quiescing) {
 410                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 411                 return;
 412         }
 413
 414         ieee80211_queue_work(&local->hw, &sdata->work);
 415 }
 416
 417 static void ieee80211_mesh_path_root_timer(unsigned long data)
 418 {
 419         struct ieee80211_sub_if_data *sdata =
 420                 (struct ieee80211_sub_if_data *) data;
 421         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 422         struct ieee80211_local *local = sdata->local;
 423
 424         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 425
 426         if (local->quiescing) {
 427                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 428                 return;
 429         }
 430
 431         ieee80211_queue_work(&local->hw, &sdata->work);
 432 }
 433
 434 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 435 {
 436         if (ifmsh->mshcfg.dot11MeshHWMPRootMode)
 437                 set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 438         else {
 439                 clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 440                 /* stop running timer */
 441                 del_timer_sync(&ifmsh->mesh_path_root_timer);
 442         }
 443 }
 444
 445 /**
 446  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
 447  * @hdr:        802.11 frame header
 448  * @fc:         frame control field
 449  * @meshda:     destination address in the mesh
 450  * @meshsa:     source address address in the mesh.  Same as TA, as frame is
 451  *              locally originated.
 452  *
 453  * Return the length of the 802.11 (does not include a mesh control header)
 454  */
 455 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
 456                                   const u8 *meshda, const u8 *meshsa)
 457 {
 458         if (is_multicast_ether_addr(meshda)) {
 459                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 460                 /* DA TA SA */
 461                 memcpy(hdr->addr1, meshda, ETH_ALEN);
 462                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 463                 memcpy(hdr->addr3, meshsa, ETH_ALEN);
 464                 return 24;
 465         } else {
 466                 *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
 467                 /* RA TA DA SA */
 468                 memset(hdr->addr1, 0, ETH_ALEN);   /* RA is resolved later */
 469                 memcpy(hdr->addr2, meshsa, ETH_ALEN);
 470                 memcpy(hdr->addr3, meshda, ETH_ALEN);
 471                 memcpy(hdr->addr4, meshsa, ETH_ALEN);
 472                 return 30;
 473         }
 474 }
 475
 476 /**
 477  * ieee80211_new_mesh_header - create a new mesh header
 478  * @meshhdr:    uninitialized mesh header
 479  * @sdata:      mesh interface to be used
 480  * @addr4or5:   1st address in the ae header, which may correspond to address 4
 481  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
 482  *              be NULL.
 483  * @addr6:      2nd address in the ae header, which corresponds to addr6 of the
 484  *              mesh frame
 485  *
 486  * Return the header length.
 487  */
 488 int ieee80211_new_mesh_header(struct ieee80211s_hdr *meshhdr,
 489                 struct ieee80211_sub_if_data *sdata, char *addr4or5,
 490                 char *addr6)
 491 {
 492         int aelen = 0;
 493         BUG_ON(!addr4or5 && addr6);
 494         memset(meshhdr, 0, sizeof(*meshhdr));
 495         meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 496         put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
 497         sdata->u.mesh.mesh_seqnum++;
 498         if (addr4or5 && !addr6) {
 499                 meshhdr->flags |= MESH_FLAGS_AE_A4;
 500                 aelen += ETH_ALEN;
 501                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 502         } else if (addr4or5 && addr6) {
 503                 meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
 504                 aelen += 2 * ETH_ALEN;
 505                 memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
 506                 memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
 507         }
 508         return 6 + aelen;
 509 }
 510
 511 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
 512                            struct ieee80211_if_mesh *ifmsh)
 513 {
 514         bool free_plinks;
 515
 516 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 517         printk(KERN_DEBUG "%s: running mesh housekeeping\n",
 518                sdata->name);
 519 #endif
 520
 521         ieee80211_sta_expire(sdata, IEEE80211_MESH_PEER_INACTIVITY_LIMIT);
 522         mesh_path_expire(sdata);
 523
 524         free_plinks = mesh_plink_availables(sdata);
 525         if (free_plinks != sdata->u.mesh.accepting_plinks)
 526                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
 527
 528         mod_timer(&ifmsh->housekeeping_timer,
 529                   round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 530 }
 531
 532 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 533 {
 534         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 535
 536         mesh_path_tx_root_frame(sdata);
 537         mod_timer(&ifmsh->mesh_path_root_timer,
 538                   round_jiffies(TU_TO_EXP_TIME(
 539                                   ifmsh->mshcfg.dot11MeshHWMPRannInterval)));
 540 }
 541
 542 #ifdef CONFIG_PM
 543 void ieee80211_mesh_quiesce(struct ieee80211_sub_if_data *sdata)
 544 {
 545         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 546
 547         /* use atomic bitops in case all timers fire at the same time */
 548
 549         if (del_timer_sync(&ifmsh->housekeeping_timer))
 550                 set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
 551         if (del_timer_sync(&ifmsh->mesh_path_timer))
 552                 set_bit(TMR_RUNNING_MP, &ifmsh->timers_running);
 553         if (del_timer_sync(&ifmsh->mesh_path_root_timer))
 554                 set_bit(TMR_RUNNING_MPR, &ifmsh->timers_running);
 555 }
 556
 557 void ieee80211_mesh_restart(struct ieee80211_sub_if_data *sdata)
 558 {
 559         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 560
 561         if (test_and_clear_bit(TMR_RUNNING_HK, &ifmsh->timers_running))
 562                 add_timer(&ifmsh->housekeeping_timer);
 563         if (test_and_clear_bit(TMR_RUNNING_MP, &ifmsh->timers_running))
 564                 add_timer(&ifmsh->mesh_path_timer);
 565         if (test_and_clear_bit(TMR_RUNNING_MPR, &ifmsh->timers_running))
 566                 add_timer(&ifmsh->mesh_path_root_timer);
 567         ieee80211_mesh_root_setup(ifmsh);
 568 }
 569 #endif
 570
 571 void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 572 {
 573         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 574         struct ieee80211_local *local = sdata->local;
 575
 576         local->fif_other_bss++;
 577         /* mesh ifaces must set allmulti to forward mcast traffic */
 578         atomic_inc(&local->iff_allmultis);
 579         ieee80211_configure_filter(local);
 580
 581         ifmsh->mesh_cc_id = 0;  /* Disabled */
 582         ifmsh->mesh_sp_id = 0;  /* Neighbor Offset */
 583         ifmsh->mesh_auth_id = 0;        /* Disabled */
 584         set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 585         ieee80211_mesh_root_setup(ifmsh);
 586         ieee80211_queue_work(&local->hw, &sdata->work);
 587         sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
 588         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 589                                                 BSS_CHANGED_BEACON_ENABLED |
 590                                                 BSS_CHANGED_BEACON_INT);
 591 }
 592
 593 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 594 {
 595         struct ieee80211_local *local = sdata->local;
 596         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 597
 598         ifmsh->mesh_id_len = 0;
 599         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED);
 600         sta_info_flush(local, NULL);
 601
 602         del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 603         del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
 604         /*
 605          * If the timer fired while we waited for it, it will have
 606          * requeued the work. Now the work will be running again
 607          * but will not rearm the timer again because it checks
 608          * whether the interface is running, which, at this point,
 609          * it no longer is.
 610          */
 611         cancel_work_sync(&sdata->work);
 612
 613         local->fif_other_bss--;
 614         atomic_dec(&local->iff_allmultis);
 615         ieee80211_configure_filter(local);
 616 }
 617
 618 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
 619                                         u16 stype,
 620                                         struct ieee80211_mgmt *mgmt,
 621                                         size_t len,
 622                                         struct ieee80211_rx_status *rx_status)
 623 {
 624         struct ieee80211_local *local = sdata->local;
 625         struct ieee802_11_elems elems;
 626         struct ieee80211_channel *channel;
 627         u32 supp_rates = 0;
 628         size_t baselen;
 629         int freq;
 630         enum ieee80211_band band = rx_status->band;
 631
 632         /* ignore ProbeResp to foreign address */
 633         if (stype == IEEE80211_STYPE_PROBE_RESP &&
 634             compare_ether_addr(mgmt->da, sdata->vif.addr))
 635                 return;
 636
 637         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
 638         if (baselen > len)
 639                 return;
 640
 641         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
 642                                &elems);
 643
 644         /* ignore beacons from secure mesh peers if our security is off */
 645         if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE)
 646                 return;
 647
 648         if (elems.ds_params && elems.ds_params_len == 1)
 649                 freq = ieee80211_channel_to_frequency(elems.ds_params[0], band);
 650         else
 651                 freq = rx_status->freq;
 652
 653         channel = ieee80211_get_channel(local->hw.wiphy, freq);
 654
 655         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 656                 return;
 657
 658         if (elems.mesh_id && elems.mesh_config &&
 659             mesh_matches_local(&elems, sdata)) {
 660                 supp_rates = ieee80211_sta_get_rates(local, &elems, band);
 661                 mesh_neighbour_update(mgmt->sa, supp_rates, sdata, &elems);
 662         }
 663 }
 664
 665 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
 666                                           struct ieee80211_mgmt *mgmt,
 667                                           size_t len,
 668                                           struct ieee80211_rx_status *rx_status)
 669 {
 670         switch (mgmt->u.action.category) {
 671         case WLAN_CATEGORY_SELF_PROTECTED:
 672                 switch (mgmt->u.action.u.self_prot.action_code) {
 673                 case WLAN_SP_MESH_PEERING_OPEN:
 674                 case WLAN_SP_MESH_PEERING_CLOSE:
 675                 case WLAN_SP_MESH_PEERING_CONFIRM:
 676                         mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
 677                         break;
 678                 }
 679                 break;
 680         case WLAN_CATEGORY_MESH_ACTION:
 681                 if (mesh_action_is_path_sel(mgmt))
 682                         mesh_rx_path_sel_frame(sdata, mgmt, len);
 683                 break;
 684         }
 685 }
 686
 687 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 688                                    struct sk_buff *skb)
 689 {
 690         struct ieee80211_rx_status *rx_status;
 691         struct ieee80211_mgmt *mgmt;
 692         u16 stype;
 693
 694         rx_status = IEEE80211_SKB_RXCB(skb);
 695         mgmt = (struct ieee80211_mgmt *) skb->data;
 696         stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 697
 698         switch (stype) {
 699         case IEEE80211_STYPE_PROBE_RESP:
 700         case IEEE80211_STYPE_BEACON:
 701                 ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
 702                                             rx_status);
 703                 break;
 704         case IEEE80211_STYPE_ACTION:
 705                 ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
 706                 break;
 707         }
 708 }
 709
 710 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 711 {
 712         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 713
 714         if (ifmsh->preq_queue_len &&
 715             time_after(jiffies,
 716                        ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
 717                 mesh_path_start_discovery(sdata);
 718
 719         if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
 720                 mesh_mpath_table_grow();
 721
 722         if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))
 723                 mesh_mpp_table_grow();
 724
 725         if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
 726                 ieee80211_mesh_housekeeping(sdata, ifmsh);
 727
 728         if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
 729                 ieee80211_mesh_rootpath(sdata);
 730 }
 731
 732 void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 733 {
 734         struct ieee80211_sub_if_data *sdata;
 735
 736         rcu_read_lock();
 737         list_for_each_entry_rcu(sdata, &local->interfaces, list)
 738                 if (ieee80211_vif_is_mesh(&sdata->vif))
 739                         ieee80211_queue_work(&local->hw, &sdata->work);
 740         rcu_read_unlock();
 741 }
 742
 743 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 744 {
 745         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 746
 747         setup_timer(&ifmsh->housekeeping_timer,
 748                     ieee80211_mesh_housekeeping_timer,
 749                     (unsigned long) sdata);
 750
 751         ifmsh->accepting_plinks = true;
 752         ifmsh->preq_id = 0;
 753         ifmsh->sn = 0;
 754         ifmsh->num_gates = 0;
 755         atomic_set(&ifmsh->mpaths, 0);
 756         mesh_rmc_init(sdata);
 757         ifmsh->last_preq = jiffies;
 758         /* Allocate all mesh structures when creating the first mesh interface. */
 759         if (!mesh_allocated)
 760                 ieee80211s_init();
 761         setup_timer(&ifmsh->mesh_path_timer,
 762                     ieee80211_mesh_path_timer,
 763                     (unsigned long) sdata);
 764         setup_timer(&ifmsh->mesh_path_root_timer,
 765                     ieee80211_mesh_path_root_timer,
 766                     (unsigned long) sdata);
 767         INIT_LIST_HEAD(&ifmsh->preq_queue.list);
 768         spin_lock_init(&ifmsh->mesh_preq_queue_lock);
 769 }