net/mac80211/mesh_hwmp.c

   1 /*
   2  * Copyright (c) 2008, 2009 open80211s Ltd.
   3  * Author:     Luis Carlos Cobo <luisca@cozybit.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/slab.h>
  11 #include "wme.h"
  12 #include "mesh.h"
  13
  14 #ifdef CONFIG_MAC80211_VERBOSE_MHWMP_DEBUG
  15 #define mhwmp_dbg(fmt, args...) \
  16         printk(KERN_DEBUG "Mesh HWMP (%s): " fmt "\n", sdata->name, ##args)
  17 #else
  18 #define mhwmp_dbg(fmt, args...)   do { (void)(0); } while (0)
  19 #endif
  20
  21 #define TEST_FRAME_LEN  8192
  22 #define MAX_METRIC      0xffffffff
  23 #define ARITH_SHIFT     8
  24
  25 /* Number of frames buffered per destination for unresolved destinations */
  26 #define MESH_FRAME_QUEUE_LEN    10
  27 #define MAX_PREQ_QUEUE_LEN      64
  28
  29 /* Destination only */
  30 #define MP_F_DO 0x1
  31 /* Reply and forward */
  32 #define MP_F_RF 0x2
  33 /* Unknown Sequence Number */
  34 #define MP_F_USN    0x01
  35 /* Reason code Present */
  36 #define MP_F_RCODE  0x02
  37
  38 static void mesh_queue_preq(struct mesh_path *, u8);
  39
  40 static inline u32 u32_field_get(u8 *preq_elem, int offset, bool ae)
  41 {
  42         if (ae)
  43                 offset += 6;
  44         return get_unaligned_le32(preq_elem + offset);
  45 }
  46
  47 static inline u32 u16_field_get(u8 *preq_elem, int offset, bool ae)
  48 {
  49         if (ae)
  50                 offset += 6;
  51         return get_unaligned_le16(preq_elem + offset);
  52 }
  53
  54 /* HWMP IE processing macros */
  55 #define AE_F                    (1<<6)
  56 #define AE_F_SET(x)             (*x & AE_F)
  57 #define PREQ_IE_FLAGS(x)        (*(x))
  58 #define PREQ_IE_HOPCOUNT(x)     (*(x + 1))
  59 #define PREQ_IE_TTL(x)          (*(x + 2))
  60 #define PREQ_IE_PREQ_ID(x)      u32_field_get(x, 3, 0)
  61 #define PREQ_IE_ORIG_ADDR(x)    (x + 7)
  62 #define PREQ_IE_ORIG_SN(x)      u32_field_get(x, 13, 0)
  63 #define PREQ_IE_LIFETIME(x)     u32_field_get(x, 17, AE_F_SET(x))
  64 #define PREQ_IE_METRIC(x)       u32_field_get(x, 21, AE_F_SET(x))
  65 #define PREQ_IE_TARGET_F(x)     (*(AE_F_SET(x) ? x + 32 : x + 26))
  66 #define PREQ_IE_TARGET_ADDR(x)  (AE_F_SET(x) ? x + 33 : x + 27)
  67 #define PREQ_IE_TARGET_SN(x)    u32_field_get(x, 33, AE_F_SET(x))
  68
  69
  70 #define PREP_IE_FLAGS(x)        PREQ_IE_FLAGS(x)
  71 #define PREP_IE_HOPCOUNT(x)     PREQ_IE_HOPCOUNT(x)
  72 #define PREP_IE_TTL(x)          PREQ_IE_TTL(x)
  73 #define PREP_IE_ORIG_ADDR(x)    (AE_F_SET(x) ? x + 27 : x + 21)
  74 #define PREP_IE_ORIG_SN(x)      u32_field_get(x, 27, AE_F_SET(x))
  75 #define PREP_IE_LIFETIME(x)     u32_field_get(x, 13, AE_F_SET(x))
  76 #define PREP_IE_METRIC(x)       u32_field_get(x, 17, AE_F_SET(x))
  77 #define PREP_IE_TARGET_ADDR(x)  (x + 3)
  78 #define PREP_IE_TARGET_SN(x)    u32_field_get(x, 9, 0)
  79
  80 #define PERR_IE_TTL(x)          (*(x))
  81 #define PERR_IE_TARGET_FLAGS(x) (*(x + 2))
  82 #define PERR_IE_TARGET_ADDR(x)  (x + 3)
  83 #define PERR_IE_TARGET_SN(x)    u32_field_get(x, 9, 0)
  84 #define PERR_IE_TARGET_RCODE(x) u16_field_get(x, 13, 0)
  85
  86 #define MSEC_TO_TU(x) (x*1000/1024)
  87 #define SN_GT(x, y) ((long) (y) - (long) (x) < 0)
  88 #define SN_LT(x, y) ((long) (x) - (long) (y) < 0)
  89
  90 #define net_traversal_jiffies(s) \
  91         msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime)
  92 #define default_lifetime(s) \
  93         MSEC_TO_TU(s->u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout)
  94 #define min_preq_int_jiff(s) \
  95         (msecs_to_jiffies(s->u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval))
  96 #define max_preq_retries(s) (s->u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries)
  97 #define disc_timeout_jiff(s) \
  98         msecs_to_jiffies(sdata->u.mesh.mshcfg.min_discovery_timeout)
  99
 100 enum mpath_frame_type {
 101         MPATH_PREQ = 0,
 102         MPATH_PREP,
 103         MPATH_PERR,
 104         MPATH_RANN
 105 };
 106
 107 static const u8 broadcast_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 108
 109 static int mesh_path_sel_frame_tx(enum mpath_frame_type action, u8 flags,
 110                 u8 *orig_addr, __le32 orig_sn, u8 target_flags, u8 *target,
 111                 __le32 target_sn, const u8 *da, u8 hop_count, u8 ttl,
 112                 __le32 lifetime, __le32 metric, __le32 preq_id,
 113                 struct ieee80211_sub_if_data *sdata)
 114 {
 115         struct ieee80211_local *local = sdata->local;
 116         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 117         struct ieee80211_mgmt *mgmt;
 118         u8 *pos;
 119         int ie_len;
 120
 121         if (!skb)
 122                 return -1;
 123         skb_reserve(skb, local->hw.extra_tx_headroom);
 124         /* 25 is the size of the common mgmt part (24) plus the size of the
 125          * common action part (1)
 126          */
 127         mgmt = (struct ieee80211_mgmt *)
 128                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
 129         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
 130         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 131                                           IEEE80211_STYPE_ACTION);
 132
 133         memcpy(mgmt->da, da, ETH_ALEN);
 134         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 135         /* BSSID == SA */
 136         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 137         mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
 138         mgmt->u.action.u.mesh_action.action_code =
 139                                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
 140
 141         switch (action) {
 142         case MPATH_PREQ:
 143                 mhwmp_dbg("sending PREQ to %pM", target);
 144                 ie_len = 37;
 145                 pos = skb_put(skb, 2 + ie_len);
 146                 *pos++ = WLAN_EID_PREQ;
 147                 break;
 148         case MPATH_PREP:
 149                 mhwmp_dbg("sending PREP to %pM", target);
 150                 ie_len = 31;
 151                 pos = skb_put(skb, 2 + ie_len);
 152                 *pos++ = WLAN_EID_PREP;
 153                 break;
 154         case MPATH_RANN:
 155                 mhwmp_dbg("sending RANN from %pM", orig_addr);
 156                 ie_len = sizeof(struct ieee80211_rann_ie);
 157                 pos = skb_put(skb, 2 + ie_len);
 158                 *pos++ = WLAN_EID_RANN;
 159                 break;
 160         default:
 161                 kfree_skb(skb);
 162                 return -ENOTSUPP;
 163                 break;
 164         }
 165         *pos++ = ie_len;
 166         *pos++ = flags;
 167         *pos++ = hop_count;
 168         *pos++ = ttl;
 169         if (action == MPATH_PREP) {
 170                 memcpy(pos, target, ETH_ALEN);
 171                 pos += ETH_ALEN;
 172                 memcpy(pos, &target_sn, 4);
 173                 pos += 4;
 174         } else {
 175                 if (action == MPATH_PREQ) {
 176                         memcpy(pos, &preq_id, 4);
 177                         pos += 4;
 178                 }
 179                 memcpy(pos, orig_addr, ETH_ALEN);
 180                 pos += ETH_ALEN;
 181                 memcpy(pos, &orig_sn, 4);
 182                 pos += 4;
 183         }
 184         memcpy(pos, &lifetime, 4);      /* interval for RANN */
 185         pos += 4;
 186         memcpy(pos, &metric, 4);
 187         pos += 4;
 188         if (action == MPATH_PREQ) {
 189                 *pos++ = 1; /* destination count */
 190                 *pos++ = target_flags;
 191                 memcpy(pos, target, ETH_ALEN);
 192                 pos += ETH_ALEN;
 193                 memcpy(pos, &target_sn, 4);
 194                 pos += 4;
 195         } else if (action == MPATH_PREP) {
 196                 memcpy(pos, orig_addr, ETH_ALEN);
 197                 pos += ETH_ALEN;
 198                 memcpy(pos, &orig_sn, 4);
 199                 pos += 4;
 200         }
 201
 202         ieee80211_tx_skb(sdata, skb);
 203         return 0;
 204 }
 205
 206
 207 /*  Headroom is not adjusted.  Caller should ensure that skb has sufficient
 208  *  headroom in case the frame is encrypted. */
 209 static void prepare_frame_for_deferred_tx(struct ieee80211_sub_if_data *sdata,
 210                 struct sk_buff *skb)
 211 {
 212         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 213
 214         skb_set_mac_header(skb, 0);
 215         skb_set_network_header(skb, 0);
 216         skb_set_transport_header(skb, 0);
 217
 218         /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
 219         skb_set_queue_mapping(skb, IEEE80211_AC_VO);
 220         skb->priority = 7;
 221
 222         info->control.vif = &sdata->vif;
 223         ieee80211_set_qos_hdr(sdata, skb);
 224 }
 225
 226 /**
 227  * mesh_send_path error - Sends a PERR mesh management frame
 228  *
 229  * @target: broken destination
 230  * @target_sn: SN of the broken destination
 231  * @target_rcode: reason code for this PERR
 232  * @ra: node this frame is addressed to
 233  *
 234  * Note: This function may be called with driver locks taken that the driver
 235  * also acquires in the TX path.  To avoid a deadlock we don't transmit the
 236  * frame directly but add it to the pending queue instead.
 237  */
 238 int mesh_path_error_tx(u8 ttl, u8 *target, __le32 target_sn,
 239                        __le16 target_rcode, const u8 *ra,
 240                        struct ieee80211_sub_if_data *sdata)
 241 {
 242         struct ieee80211_local *local = sdata->local;
 243         struct sk_buff *skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
 244         struct ieee80211_mgmt *mgmt;
 245         u8 *pos;
 246         int ie_len;
 247
 248         if (!skb)
 249                 return -1;
 250         skb_reserve(skb, local->tx_headroom + local->hw.extra_tx_headroom);
 251         /* 25 is the size of the common mgmt part (24) plus the size of the
 252          * common action part (1)
 253          */
 254         mgmt = (struct ieee80211_mgmt *)
 255                 skb_put(skb, 25 + sizeof(mgmt->u.action.u.mesh_action));
 256         memset(mgmt, 0, 25 + sizeof(mgmt->u.action.u.mesh_action));
 257         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 258                                           IEEE80211_STYPE_ACTION);
 259
 260         memcpy(mgmt->da, ra, ETH_ALEN);
 261         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 262         /* BSSID == SA */
 263         memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
 264         mgmt->u.action.category = WLAN_CATEGORY_MESH_ACTION;
 265         mgmt->u.action.u.mesh_action.action_code =
 266                                         WLAN_MESH_ACTION_HWMP_PATH_SELECTION;
 267         ie_len = 15;
 268         pos = skb_put(skb, 2 + ie_len);
 269         *pos++ = WLAN_EID_PERR;
 270         *pos++ = ie_len;
 271         /* ttl */
 272         *pos++ = ttl;
 273         /* number of destinations */
 274         *pos++ = 1;
 275         /*
 276          * flags bit, bit 1 is unset if we know the sequence number and
 277          * bit 2 is set if we have a reason code
 278          */
 279         *pos = 0;
 280         if (!target_sn)
 281                 *pos |= MP_F_USN;
 282         if (target_rcode)
 283                 *pos |= MP_F_RCODE;
 284         pos++;
 285         memcpy(pos, target, ETH_ALEN);
 286         pos += ETH_ALEN;
 287         memcpy(pos, &target_sn, 4);
 288         pos += 4;
 289         memcpy(pos, &target_rcode, 2);
 290
 291         /* see note in function header */
 292         prepare_frame_for_deferred_tx(sdata, skb);
 293         ieee80211_add_pending_skb(local, skb);
 294         return 0;
 295 }
 296
 297 void ieee80211s_update_metric(struct ieee80211_local *local,
 298                 struct sta_info *stainfo, struct sk_buff *skb)
 299 {
 300         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 301         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 302         int failed;
 303
 304         if (!ieee80211_is_data(hdr->frame_control))
 305                 return;
 306
 307         failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
 308
 309         /* moving average, scaled to 100 */
 310         stainfo->fail_avg = ((80 * stainfo->fail_avg + 5) / 100 + 20 * failed);
 311         if (stainfo->fail_avg > 95)
 312                 mesh_plink_broken(stainfo);
 313 }
 314
 315 static u32 airtime_link_metric_get(struct ieee80211_local *local,
 316                                    struct sta_info *sta)
 317 {
 318         struct ieee80211_supported_band *sband;
 319         /* This should be adjusted for each device */
 320         int device_constant = 1 << ARITH_SHIFT;
 321         int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
 322         int s_unit = 1 << ARITH_SHIFT;
 323         int rate, err;
 324         u32 tx_time, estimated_retx;
 325         u64 result;
 326
 327         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 328
 329         if (sta->fail_avg >= 100)
 330                 return MAX_METRIC;
 331
 332         if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
 333                 return MAX_METRIC;
 334
 335         err = (sta->fail_avg << ARITH_SHIFT) / 100;
 336
 337         /* bitrate is in units of 100 Kbps, while we need rate in units of
 338          * 1Mbps. This will be corrected on tx_time computation.
 339          */
 340         rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
 341         tx_time = (device_constant + 10 * test_frame_len / rate);
 342         estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err));
 343         result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ;
 344         return (u32)result;
 345 }
 346
 347 /**
 348  * hwmp_route_info_get - Update routing info to originator and transmitter
 349  *
 350  * @sdata: local mesh subif
 351  * @mgmt: mesh management frame
 352  * @hwmp_ie: hwmp information element (PREP or PREQ)
 353  *
 354  * This function updates the path routing information to the originator and the
 355  * transmitter of a HWMP PREQ or PREP frame.
 356  *
 357  * Returns: metric to frame originator or 0 if the frame should not be further
 358  * processed
 359  *
 360  * Notes: this function is the only place (besides user-provided info) where
 361  * path routing information is updated.
 362  */
 363 static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
 364                             struct ieee80211_mgmt *mgmt,
 365                             u8 *hwmp_ie, enum mpath_frame_type action)
 366 {
 367         struct ieee80211_local *local = sdata->local;
 368         struct mesh_path *mpath;
 369         struct sta_info *sta;
 370         bool fresh_info;
 371         u8 *orig_addr, *ta;
 372         u32 orig_sn, orig_metric;
 373         unsigned long orig_lifetime, exp_time;
 374         u32 last_hop_metric, new_metric;
 375         bool process = true;
 376
 377         rcu_read_lock();
 378         sta = sta_info_get(sdata, mgmt->sa);
 379         if (!sta) {
 380                 rcu_read_unlock();
 381                 return 0;
 382         }
 383
 384         last_hop_metric = airtime_link_metric_get(local, sta);
 385         /* Update and check originator routing info */
 386         fresh_info = true;
 387
 388         switch (action) {
 389         case MPATH_PREQ:
 390                 orig_addr = PREQ_IE_ORIG_ADDR(hwmp_ie);
 391                 orig_sn = PREQ_IE_ORIG_SN(hwmp_ie);
 392                 orig_lifetime = PREQ_IE_LIFETIME(hwmp_ie);
 393                 orig_metric = PREQ_IE_METRIC(hwmp_ie);
 394                 break;
 395         case MPATH_PREP:
 396                 /* Originator here refers to the MP that was the destination in
 397                  * the Path Request. The draft refers to that MP as the
 398                  * destination address, even though usually it is the origin of
 399                  * the PREP frame. We divert from the nomenclature in the draft
 400                  * so that we can easily use a single function to gather path
 401                  * information from both PREQ and PREP frames.
 402                  */
 403                 orig_addr = PREP_IE_ORIG_ADDR(hwmp_ie);
 404                 orig_sn = PREP_IE_ORIG_SN(hwmp_ie);
 405                 orig_lifetime = PREP_IE_LIFETIME(hwmp_ie);
 406                 orig_metric = PREP_IE_METRIC(hwmp_ie);
 407                 break;
 408         default:
 409                 rcu_read_unlock();
 410                 return 0;
 411         }
 412         new_metric = orig_metric + last_hop_metric;
 413         if (new_metric < orig_metric)
 414                 new_metric = MAX_METRIC;
 415         exp_time = TU_TO_EXP_TIME(orig_lifetime);
 416
 417         if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0) {
 418                 /* This MP is the originator, we are not interested in this
 419                  * frame, except for updating transmitter's path info.
 420                  */
 421                 process = false;
 422                 fresh_info = false;
 423         } else {
 424                 mpath = mesh_path_lookup(orig_addr, sdata);
 425                 if (mpath) {
 426                         spin_lock_bh(&mpath->state_lock);
 427                         if (mpath->flags & MESH_PATH_FIXED)
 428                                 fresh_info = false;
 429                         else if ((mpath->flags & MESH_PATH_ACTIVE) &&
 430                             (mpath->flags & MESH_PATH_SN_VALID)) {
 431                                 if (SN_GT(mpath->sn, orig_sn) ||
 432                                     (mpath->sn == orig_sn &&
 433                                      new_metric >= mpath->metric)) {
 434                                         process = false;
 435                                         fresh_info = false;
 436                                 }
 437                         }
 438                 } else {
 439                         mesh_path_add(orig_addr, sdata);
 440                         mpath = mesh_path_lookup(orig_addr, sdata);
 441                         if (!mpath) {
 442                                 rcu_read_unlock();
 443                                 return 0;
 444                         }
 445                         spin_lock_bh(&mpath->state_lock);
 446                 }
 447
 448                 if (fresh_info) {
 449                         mesh_path_assign_nexthop(mpath, sta);
 450                         mpath->flags |= MESH_PATH_SN_VALID;
 451                         mpath->metric = new_metric;
 452                         mpath->sn = orig_sn;
 453                         mpath->exp_time = time_after(mpath->exp_time, exp_time)
 454                                           ?  mpath->exp_time : exp_time;
 455                         mesh_path_activate(mpath);
 456                         spin_unlock_bh(&mpath->state_lock);
 457                         mesh_path_tx_pending(mpath);
 458                         /* draft says preq_id should be saved to, but there does
 459                          * not seem to be any use for it, skipping by now
 460                          */
 461                 } else
 462                         spin_unlock_bh(&mpath->state_lock);
 463         }
 464
 465         /* Update and check transmitter routing info */
 466         ta = mgmt->sa;
 467         if (memcmp(orig_addr, ta, ETH_ALEN) == 0)
 468                 fresh_info = false;
 469         else {
 470                 fresh_info = true;
 471
 472                 mpath = mesh_path_lookup(ta, sdata);
 473                 if (mpath) {
 474                         spin_lock_bh(&mpath->state_lock);
 475                         if ((mpath->flags & MESH_PATH_FIXED) ||
 476                                 ((mpath->flags & MESH_PATH_ACTIVE) &&
 477                                         (last_hop_metric > mpath->metric)))
 478                                 fresh_info = false;
 479                 } else {
 480                         mesh_path_add(ta, sdata);
 481                         mpath = mesh_path_lookup(ta, sdata);
 482                         if (!mpath) {
 483                                 rcu_read_unlock();
 484                                 return 0;
 485                         }
 486                         spin_lock_bh(&mpath->state_lock);
 487                 }
 488
 489                 if (fresh_info) {
 490                         mesh_path_assign_nexthop(mpath, sta);
 491                         mpath->metric = last_hop_metric;
 492                         mpath->exp_time = time_after(mpath->exp_time, exp_time)
 493                                           ?  mpath->exp_time : exp_time;
 494                         mesh_path_activate(mpath);
 495                         spin_unlock_bh(&mpath->state_lock);
 496                         mesh_path_tx_pending(mpath);
 497                 } else
 498                         spin_unlock_bh(&mpath->state_lock);
 499         }
 500
 501         rcu_read_unlock();
 502
 503         return process ? new_metric : 0;
 504 }
 505
 506 static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
 507                                     struct ieee80211_mgmt *mgmt,
 508                                     u8 *preq_elem, u32 metric)
 509 {
 510         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 511         struct mesh_path *mpath;
 512         u8 *target_addr, *orig_addr;
 513         u8 target_flags, ttl;
 514         u32 orig_sn, target_sn, lifetime;
 515         bool reply = false;
 516         bool forward = true;
 517
 518         /* Update target SN, if present */
 519         target_addr = PREQ_IE_TARGET_ADDR(preq_elem);
 520         orig_addr = PREQ_IE_ORIG_ADDR(preq_elem);
 521         target_sn = PREQ_IE_TARGET_SN(preq_elem);
 522         orig_sn = PREQ_IE_ORIG_SN(preq_elem);
 523         target_flags = PREQ_IE_TARGET_F(preq_elem);
 524
 525         mhwmp_dbg("received PREQ from %pM", orig_addr);
 526
 527         if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0) {
 528                 mhwmp_dbg("PREQ is for us");
 529                 forward = false;
 530                 reply = true;
 531                 metric = 0;
 532                 if (time_after(jiffies, ifmsh->last_sn_update +
 533                                         net_traversal_jiffies(sdata)) ||
 534                     time_before(jiffies, ifmsh->last_sn_update)) {
 535                         target_sn = ++ifmsh->sn;
 536                         ifmsh->last_sn_update = jiffies;
 537                 }
 538         } else {
 539                 rcu_read_lock();
 540                 mpath = mesh_path_lookup(target_addr, sdata);
 541                 if (mpath) {
 542                         if ((!(mpath->flags & MESH_PATH_SN_VALID)) ||
 543                                         SN_LT(mpath->sn, target_sn)) {
 544                                 mpath->sn = target_sn;
 545                                 mpath->flags |= MESH_PATH_SN_VALID;
 546                         } else if ((!(target_flags & MP_F_DO)) &&
 547                                         (mpath->flags & MESH_PATH_ACTIVE)) {
 548                                 reply = true;
 549                                 metric = mpath->metric;
 550                                 target_sn = mpath->sn;
 551                                 if (target_flags & MP_F_RF)
 552                                         target_flags |= MP_F_DO;
 553                                 else
 554                                         forward = false;
 555                         }
 556                 }
 557                 rcu_read_unlock();
 558         }
 559
 560         if (reply) {
 561                 lifetime = PREQ_IE_LIFETIME(preq_elem);
 562                 ttl = ifmsh->mshcfg.element_ttl;
 563                 if (ttl != 0) {
 564                         mhwmp_dbg("replying to the PREQ");
 565                         mesh_path_sel_frame_tx(MPATH_PREP, 0, target_addr,
 566                                 cpu_to_le32(target_sn), 0, orig_addr,
 567                                 cpu_to_le32(orig_sn), mgmt->sa, 0, ttl,
 568                                 cpu_to_le32(lifetime), cpu_to_le32(metric),
 569                                 0, sdata);
 570                 } else
 571                         ifmsh->mshstats.dropped_frames_ttl++;
 572         }
 573
 574         if (forward) {
 575                 u32 preq_id;
 576                 u8 hopcount, flags;
 577
 578                 ttl = PREQ_IE_TTL(preq_elem);
 579                 lifetime = PREQ_IE_LIFETIME(preq_elem);
 580                 if (ttl <= 1) {
 581                         ifmsh->mshstats.dropped_frames_ttl++;
 582                         return;
 583                 }
 584                 mhwmp_dbg("forwarding the PREQ from %pM", orig_addr);
 585                 --ttl;
 586                 flags = PREQ_IE_FLAGS(preq_elem);
 587                 preq_id = PREQ_IE_PREQ_ID(preq_elem);
 588                 hopcount = PREQ_IE_HOPCOUNT(preq_elem) + 1;
 589                 mesh_path_sel_frame_tx(MPATH_PREQ, flags, orig_addr,
 590                                 cpu_to_le32(orig_sn), target_flags, target_addr,
 591                                 cpu_to_le32(target_sn), broadcast_addr,
 592                                 hopcount, ttl, cpu_to_le32(lifetime),
 593                                 cpu_to_le32(metric), cpu_to_le32(preq_id),
 594                                 sdata);
 595                 ifmsh->mshstats.fwded_mcast++;
 596                 ifmsh->mshstats.fwded_frames++;
 597         }
 598 }
 599
 600
 601 static inline struct sta_info *
 602 next_hop_deref_protected(struct mesh_path *mpath)
 603 {
 604         return rcu_dereference_protected(mpath->next_hop,
 605                                          lockdep_is_held(&mpath->state_lock));
 606 }
 607
 608
 609 static void hwmp_prep_frame_process(struct ieee80211_sub_if_data *sdata,
 610                                     struct ieee80211_mgmt *mgmt,
 611                                     u8 *prep_elem, u32 metric)
 612 {
 613         struct mesh_path *mpath;
 614         u8 *target_addr, *orig_addr;
 615         u8 ttl, hopcount, flags;
 616         u8 next_hop[ETH_ALEN];
 617         u32 target_sn, orig_sn, lifetime;
 618
 619         mhwmp_dbg("received PREP from %pM", PREP_IE_ORIG_ADDR(prep_elem));
 620
 621         /* Note that we divert from the draft nomenclature and denominate
 622          * destination to what the draft refers to as origininator. So in this
 623          * function destnation refers to the final destination of the PREP,
 624          * which corresponds with the originator of the PREQ which this PREP
 625          * replies
 626          */
 627         target_addr = PREP_IE_TARGET_ADDR(prep_elem);
 628         if (memcmp(target_addr, sdata->vif.addr, ETH_ALEN) == 0)
 629                 /* destination, no forwarding required */
 630                 return;
 631
 632         ttl = PREP_IE_TTL(prep_elem);
 633         if (ttl <= 1) {
 634                 sdata->u.mesh.mshstats.dropped_frames_ttl++;
 635                 return;
 636         }
 637
 638         rcu_read_lock();
 639         mpath = mesh_path_lookup(target_addr, sdata);
 640         if (mpath)
 641                 spin_lock_bh(&mpath->state_lock);
 642         else
 643                 goto fail;
 644         if (!(mpath->flags & MESH_PATH_ACTIVE)) {
 645                 spin_unlock_bh(&mpath->state_lock);
 646                 goto fail;
 647         }
 648         memcpy(next_hop, next_hop_deref_protected(mpath)->sta.addr, ETH_ALEN);
 649         spin_unlock_bh(&mpath->state_lock);
 650         --ttl;
 651         flags = PREP_IE_FLAGS(prep_elem);
 652         lifetime = PREP_IE_LIFETIME(prep_elem);
 653         hopcount = PREP_IE_HOPCOUNT(prep_elem) + 1;
 654         orig_addr = PREP_IE_ORIG_ADDR(prep_elem);
 655         target_sn = PREP_IE_TARGET_SN(prep_elem);
 656         orig_sn = PREP_IE_ORIG_SN(prep_elem);
 657
 658         mesh_path_sel_frame_tx(MPATH_PREP, flags, orig_addr,
 659                 cpu_to_le32(orig_sn), 0, target_addr,
 660                 cpu_to_le32(target_sn), next_hop, hopcount,
 661                 ttl, cpu_to_le32(lifetime), cpu_to_le32(metric),
 662                 0, sdata);
 663         rcu_read_unlock();
 664
 665         sdata->u.mesh.mshstats.fwded_unicast++;
 666         sdata->u.mesh.mshstats.fwded_frames++;
 667         return;
 668
 669 fail:
 670         rcu_read_unlock();
 671         sdata->u.mesh.mshstats.dropped_frames_no_route++;
 672 }
 673
 674 static void hwmp_perr_frame_process(struct ieee80211_sub_if_data *sdata,
 675                              struct ieee80211_mgmt *mgmt, u8 *perr_elem)
 676 {
 677         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 678         struct mesh_path *mpath;
 679         u8 ttl;
 680         u8 *ta, *target_addr;
 681         u32 target_sn;
 682         u16 target_rcode;
 683
 684         ta = mgmt->sa;
 685         ttl = PERR_IE_TTL(perr_elem);
 686         if (ttl <= 1) {
 687                 ifmsh->mshstats.dropped_frames_ttl++;
 688                 return;
 689         }
 690         ttl--;
 691         target_addr = PERR_IE_TARGET_ADDR(perr_elem);
 692         target_sn = PERR_IE_TARGET_SN(perr_elem);
 693         target_rcode = PERR_IE_TARGET_RCODE(perr_elem);
 694
 695         rcu_read_lock();
 696         mpath = mesh_path_lookup(target_addr, sdata);
 697         if (mpath) {
 698                 spin_lock_bh(&mpath->state_lock);
 699                 if (mpath->flags & MESH_PATH_ACTIVE &&
 700                     memcmp(ta, next_hop_deref_protected(mpath)->sta.addr,
 701                                                         ETH_ALEN) == 0 &&
 702                     (!(mpath->flags & MESH_PATH_SN_VALID) ||
 703                     SN_GT(target_sn, mpath->sn))) {
 704                         mpath->flags &= ~MESH_PATH_ACTIVE;
 705                         mpath->sn = target_sn;
 706                         spin_unlock_bh(&mpath->state_lock);
 707                         mesh_path_error_tx(ttl, target_addr, cpu_to_le32(target_sn),
 708                                            cpu_to_le16(target_rcode),
 709                                            broadcast_addr, sdata);
 710                 } else
 711                         spin_unlock_bh(&mpath->state_lock);
 712         }
 713         rcu_read_unlock();
 714 }
 715
 716 static void hwmp_rann_frame_process(struct ieee80211_sub_if_data *sdata,
 717                                 struct ieee80211_mgmt *mgmt,
 718                                 struct ieee80211_rann_ie *rann)
 719 {
 720         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 721         struct mesh_path *mpath;
 722         u8 ttl, flags, hopcount;
 723         u8 *orig_addr;
 724         u32 orig_sn, metric;
 725         u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
 726         bool root_is_gate;
 727
 728         ttl = rann->rann_ttl;
 729         if (ttl <= 1) {
 730                 ifmsh->mshstats.dropped_frames_ttl++;
 731                 return;
 732         }
 733         ttl--;
 734         flags = rann->rann_flags;
 735         root_is_gate = !!(flags & RANN_FLAG_IS_GATE);
 736         orig_addr = rann->rann_addr;
 737         orig_sn = rann->rann_seq;
 738         hopcount = rann->rann_hopcount;
 739         hopcount++;
 740         metric = rann->rann_metric;
 741
 742         /*  Ignore our own RANNs */
 743         if (memcmp(orig_addr, sdata->vif.addr, ETH_ALEN) == 0)
 744                 return;
 745
 746         mhwmp_dbg("received RANN from %pM (is_gate=%d)", orig_addr,
 747                         root_is_gate);
 748
 749         rcu_read_lock();
 750         mpath = mesh_path_lookup(orig_addr, sdata);
 751         if (!mpath) {
 752                 mesh_path_add(orig_addr, sdata);
 753                 mpath = mesh_path_lookup(orig_addr, sdata);
 754                 if (!mpath) {
 755                         rcu_read_unlock();
 756                         sdata->u.mesh.mshstats.dropped_frames_no_route++;
 757                         return;
 758                 }
 759         }
 760
 761         if ((!(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING)) ||
 762              time_after(jiffies, mpath->exp_time - 1*HZ)) &&
 763              !(mpath->flags & MESH_PATH_FIXED)) {
 764                 mhwmp_dbg("%s time to refresh root mpath %pM", sdata->name,
 765                                                                orig_addr);
 766                 mesh_queue_preq(mpath, PREQ_Q_F_START | PREQ_Q_F_REFRESH);
 767         }
 768
 769         if (mpath->sn < orig_sn) {
 770                 mesh_path_sel_frame_tx(MPATH_RANN, flags, orig_addr,
 771                                        cpu_to_le32(orig_sn),
 772                                        0, NULL, 0, broadcast_addr,
 773                                        hopcount, ttl, cpu_to_le32(interval),
 774                                        cpu_to_le32(metric + mpath->metric),
 775                                        0, sdata);
 776                 mpath->sn = orig_sn;
 777         }
 778         if (root_is_gate)
 779                 mesh_path_add_gate(mpath);
 780
 781         rcu_read_unlock();
 782 }
 783
 784
 785 void mesh_rx_path_sel_frame(struct ieee80211_sub_if_data *sdata,
 786                             struct ieee80211_mgmt *mgmt,
 787                             size_t len)
 788 {
 789         struct ieee802_11_elems elems;
 790         size_t baselen;
 791         u32 last_hop_metric;
 792         struct sta_info *sta;
 793
 794         /* need action_code */
 795         if (len < IEEE80211_MIN_ACTION_SIZE + 1)
 796                 return;
 797
 798         rcu_read_lock();
 799         sta = sta_info_get(sdata, mgmt->sa);
 800         if (!sta || sta->plink_state != NL80211_PLINK_ESTAB) {
 801                 rcu_read_unlock();
 802                 return;
 803         }
 804         rcu_read_unlock();
 805
 806         baselen = (u8 *) mgmt->u.action.u.mesh_action.variable - (u8 *) mgmt;
 807         ieee802_11_parse_elems(mgmt->u.action.u.mesh_action.variable,
 808                         len - baselen, &elems);
 809
 810         if (elems.preq) {
 811                 if (elems.preq_len != 37)
 812                         /* Right now we support just 1 destination and no AE */
 813                         return;
 814                 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.preq,
 815                                                       MPATH_PREQ);
 816                 if (last_hop_metric)
 817                         hwmp_preq_frame_process(sdata, mgmt, elems.preq,
 818                                                 last_hop_metric);
 819         }
 820         if (elems.prep) {
 821                 if (elems.prep_len != 31)
 822                         /* Right now we support no AE */
 823                         return;
 824                 last_hop_metric = hwmp_route_info_get(sdata, mgmt, elems.prep,
 825                                                       MPATH_PREP);
 826                 if (last_hop_metric)
 827                         hwmp_prep_frame_process(sdata, mgmt, elems.prep,
 828                                                 last_hop_metric);
 829         }
 830         if (elems.perr) {
 831                 if (elems.perr_len != 15)
 832                         /* Right now we support only one destination per PERR */
 833                         return;
 834                 hwmp_perr_frame_process(sdata, mgmt, elems.perr);
 835         }
 836         if (elems.rann)
 837                 hwmp_rann_frame_process(sdata, mgmt, elems.rann);
 838 }
 839
 840 /**
 841  * mesh_queue_preq - queue a PREQ to a given destination
 842  *
 843  * @mpath: mesh path to discover
 844  * @flags: special attributes of the PREQ to be sent
 845  *
 846  * Locking: the function must be called from within a rcu read lock block.
 847  *
 848  */
 849 static void mesh_queue_preq(struct mesh_path *mpath, u8 flags)
 850 {
 851         struct ieee80211_sub_if_data *sdata = mpath->sdata;
 852         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 853         struct mesh_preq_queue *preq_node;
 854
 855         preq_node = kmalloc(sizeof(struct mesh_preq_queue), GFP_ATOMIC);
 856         if (!preq_node) {
 857                 mhwmp_dbg("could not allocate PREQ node");
 858                 return;
 859         }
 860
 861         spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
 862         if (ifmsh->preq_queue_len == MAX_PREQ_QUEUE_LEN) {
 863                 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
 864                 kfree(preq_node);
 865                 if (printk_ratelimit())
 866                         mhwmp_dbg("PREQ node queue full");
 867                 return;
 868         }
 869
 870         memcpy(preq_node->dst, mpath->dst, ETH_ALEN);
 871         preq_node->flags = flags;
 872
 873         list_add_tail(&preq_node->list, &ifmsh->preq_queue.list);
 874         ++ifmsh->preq_queue_len;
 875         spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
 876
 877         if (time_after(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata)))
 878                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 879
 880         else if (time_before(jiffies, ifmsh->last_preq)) {
 881                 /* avoid long wait if did not send preqs for a long time
 882                  * and jiffies wrapped around
 883                  */
 884                 ifmsh->last_preq = jiffies - min_preq_int_jiff(sdata) - 1;
 885                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 886         } else
 887                 mod_timer(&ifmsh->mesh_path_timer, ifmsh->last_preq +
 888                                                 min_preq_int_jiff(sdata));
 889 }
 890
 891 /**
 892  * mesh_path_start_discovery - launch a path discovery from the PREQ queue
 893  *
 894  * @sdata: local mesh subif
 895  */
 896 void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata)
 897 {
 898         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 899         struct mesh_preq_queue *preq_node;
 900         struct mesh_path *mpath;
 901         u8 ttl, target_flags;
 902         u32 lifetime;
 903
 904         spin_lock_bh(&ifmsh->mesh_preq_queue_lock);
 905         if (!ifmsh->preq_queue_len ||
 906                 time_before(jiffies, ifmsh->last_preq +
 907                                 min_preq_int_jiff(sdata))) {
 908                 spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
 909                 return;
 910         }
 911
 912         preq_node = list_first_entry(&ifmsh->preq_queue.list,
 913                         struct mesh_preq_queue, list);
 914         list_del(&preq_node->list);
 915         --ifmsh->preq_queue_len;
 916         spin_unlock_bh(&ifmsh->mesh_preq_queue_lock);
 917
 918         rcu_read_lock();
 919         mpath = mesh_path_lookup(preq_node->dst, sdata);
 920         if (!mpath)
 921                 goto enddiscovery;
 922
 923         spin_lock_bh(&mpath->state_lock);
 924         if (preq_node->flags & PREQ_Q_F_START) {
 925                 if (mpath->flags & MESH_PATH_RESOLVING) {
 926                         spin_unlock_bh(&mpath->state_lock);
 927                         goto enddiscovery;
 928                 } else {
 929                         mpath->flags &= ~MESH_PATH_RESOLVED;
 930                         mpath->flags |= MESH_PATH_RESOLVING;
 931                         mpath->discovery_retries = 0;
 932                         mpath->discovery_timeout = disc_timeout_jiff(sdata);
 933                 }
 934         } else if (!(mpath->flags & MESH_PATH_RESOLVING) ||
 935                         mpath->flags & MESH_PATH_RESOLVED) {
 936                 mpath->flags &= ~MESH_PATH_RESOLVING;
 937                 spin_unlock_bh(&mpath->state_lock);
 938                 goto enddiscovery;
 939         }
 940
 941         ifmsh->last_preq = jiffies;
 942
 943         if (time_after(jiffies, ifmsh->last_sn_update +
 944                                 net_traversal_jiffies(sdata)) ||
 945             time_before(jiffies, ifmsh->last_sn_update)) {
 946                 ++ifmsh->sn;
 947                 sdata->u.mesh.last_sn_update = jiffies;
 948         }
 949         lifetime = default_lifetime(sdata);
 950         ttl = sdata->u.mesh.mshcfg.element_ttl;
 951         if (ttl == 0) {
 952                 sdata->u.mesh.mshstats.dropped_frames_ttl++;
 953                 spin_unlock_bh(&mpath->state_lock);
 954                 goto enddiscovery;
 955         }
 956
 957         if (preq_node->flags & PREQ_Q_F_REFRESH)
 958                 target_flags = MP_F_DO;
 959         else
 960                 target_flags = MP_F_RF;
 961
 962         spin_unlock_bh(&mpath->state_lock);
 963         mesh_path_sel_frame_tx(MPATH_PREQ, 0, sdata->vif.addr,
 964                         cpu_to_le32(ifmsh->sn), target_flags, mpath->dst,
 965                         cpu_to_le32(mpath->sn), broadcast_addr, 0,
 966                         ttl, cpu_to_le32(lifetime), 0,
 967                         cpu_to_le32(ifmsh->preq_id++), sdata);
 968         mod_timer(&mpath->timer, jiffies + mpath->discovery_timeout);
 969
 970 enddiscovery:
 971         rcu_read_unlock();
 972         kfree(preq_node);
 973 }
 974
 975 /**
 976  * mesh_nexthop_lookup - put the appropriate next hop on a mesh frame
 977  *
 978  * @skb: 802.11 frame to be sent
 979  * @sdata: network subif the frame will be sent through
 980  *
 981  * Returns: 0 if the next hop was found. Nonzero otherwise. If no next hop is
 982  * found, the function will start a path discovery and queue the frame so it is
 983  * sent when the path is resolved. This means the caller must not free the skb
 984  * in this case.
 985  */
 986 int mesh_nexthop_lookup(struct sk_buff *skb,
 987                         struct ieee80211_sub_if_data *sdata)
 988 {
 989         struct sk_buff *skb_to_free = NULL;
 990         struct mesh_path *mpath;
 991         struct sta_info *next_hop;
 992         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 993         u8 *target_addr = hdr->addr3;
 994         int err = 0;
 995
 996         rcu_read_lock();
 997         mpath = mesh_path_lookup(target_addr, sdata);
 998
 999         if (!mpath) {
1000                 mesh_path_add(target_addr, sdata);
1001                 mpath = mesh_path_lookup(target_addr, sdata);
1002                 if (!mpath) {
1003                         sdata->u.mesh.mshstats.dropped_frames_no_route++;
1004                         err = -ENOSPC;
1005                         goto endlookup;
1006                 }
1007         }
1008
1009         if (mpath->flags & MESH_PATH_ACTIVE) {
1010                 if (time_after(jiffies,
1011                                mpath->exp_time -
1012                                msecs_to_jiffies(sdata->u.mesh.mshcfg.path_refresh_time)) &&
1013                     !memcmp(sdata->vif.addr, hdr->addr4, ETH_ALEN) &&
1014                     !(mpath->flags & MESH_PATH_RESOLVING) &&
1015                     !(mpath->flags & MESH_PATH_FIXED)) {
1016                         mesh_queue_preq(mpath,
1017                                         PREQ_Q_F_START | PREQ_Q_F_REFRESH);
1018                 }
1019                 next_hop = rcu_dereference(mpath->next_hop);
1020                 if (next_hop)
1021                         memcpy(hdr->addr1, next_hop->sta.addr, ETH_ALEN);
1022                 else
1023                         err = -ENOENT;
1024         } else {
1025                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1026                 if (!(mpath->flags & MESH_PATH_RESOLVING)) {
1027                         /* Start discovery only if it is not running yet */
1028                         mesh_queue_preq(mpath, PREQ_Q_F_START);
1029                 }
1030
1031                 if (skb_queue_len(&mpath->frame_queue) >=
1032                                 MESH_FRAME_QUEUE_LEN)
1033                         skb_to_free = skb_dequeue(&mpath->frame_queue);
1034
1035                 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1036                 skb_queue_tail(&mpath->frame_queue, skb);
1037                 if (skb_to_free)
1038                         mesh_path_discard_frame(skb_to_free, sdata);
1039                 err = -ENOENT;
1040         }
1041
1042 endlookup:
1043         rcu_read_unlock();
1044         return err;
1045 }
1046
1047 void mesh_path_timer(unsigned long data)
1048 {
1049         struct mesh_path *mpath = (void *) data;
1050         struct ieee80211_sub_if_data *sdata = mpath->sdata;
1051         int ret;
1052
1053         if (sdata->local->quiescing)
1054                 return;
1055
1056         spin_lock_bh(&mpath->state_lock);
1057         if (mpath->flags & MESH_PATH_RESOLVED ||
1058                         (!(mpath->flags & MESH_PATH_RESOLVING))) {
1059                 mpath->flags &= ~(MESH_PATH_RESOLVING | MESH_PATH_RESOLVED);
1060                 spin_unlock_bh(&mpath->state_lock);
1061         } else if (mpath->discovery_retries < max_preq_retries(sdata)) {
1062                 ++mpath->discovery_retries;
1063                 mpath->discovery_timeout *= 2;
1064                 spin_unlock_bh(&mpath->state_lock);
1065                 mesh_queue_preq(mpath, 0);
1066         } else {
1067                 mpath->flags = 0;
1068                 mpath->exp_time = jiffies;
1069                 spin_unlock_bh(&mpath->state_lock);
1070                 if (!mpath->is_gate && mesh_gate_num(sdata) > 0) {
1071                         ret = mesh_path_send_to_gates(mpath);
1072                         if (ret)
1073                                 mhwmp_dbg("no gate was reachable");
1074                 } else
1075                         mesh_path_flush_pending(mpath);
1076         }
1077 }
1078
1079 void
1080 mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata)
1081 {
1082         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
1083         u32 interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
1084         u8 flags;
1085
1086         flags = (ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol)
1087                         ? RANN_FLAG_IS_GATE : 0;
1088         mesh_path_sel_frame_tx(MPATH_RANN, flags, sdata->vif.addr,
1089                                cpu_to_le32(++ifmsh->sn),
1090                                0, NULL, 0, broadcast_addr,
1091                                0, sdata->u.mesh.mshcfg.element_ttl,
1092                                cpu_to_le32(interval), 0, 0, sdata);
1093 }