sys/net80211/ieee80211_hwmp.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2009 The FreeBSD Foundation
   5  *
   6  * This software was developed by Rui Paulo under sponsorship from the
   7  * FreeBSD Foundation.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30 #include <sys/cdefs.h>
  31 #ifdef __FreeBSD__
  32 __FBSDID("$FreeBSD$");
  33 #endif
  34
  35 /*
  36  * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
  37  *
  38  * Based on March 2009, D3.0 802.11s draft spec.
  39  */
  40 #include "opt_inet.h"
  41 #include "opt_wlan.h"
  42
  43 #include <sys/param.h>
  44 #include <sys/systm.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/malloc.h>
  47 #include <sys/kernel.h>
  48
  49 #include <sys/socket.h>
  50 #include <sys/sockio.h>
  51 #include <sys/endian.h>
  52 #include <sys/errno.h>
  53 #include <sys/proc.h>
  54 #include <sys/sysctl.h>
  55
  56 #include <net/if.h>
  57 #include <net/if_media.h>
  58 #include <net/if_llc.h>
  59 #include <net/ethernet.h>
  60
  61 #include <net/bpf.h>
  62
  63 #include <net80211/ieee80211_var.h>
  64 #include <net80211/ieee80211_action.h>
  65 #include <net80211/ieee80211_input.h>
  66 #include <net80211/ieee80211_mesh.h>
  67
  68 static void     hwmp_vattach(struct ieee80211vap *);
  69 static void     hwmp_vdetach(struct ieee80211vap *);
  70 static int      hwmp_newstate(struct ieee80211vap *,
  71                     enum ieee80211_state, int);
  72 static int      hwmp_send_action(struct ieee80211vap *,
  73                     const uint8_t [IEEE80211_ADDR_LEN],
  74                     uint8_t *, size_t);
  75 static uint8_t * hwmp_add_meshpreq(uint8_t *,
  76                     const struct ieee80211_meshpreq_ie *);
  77 static uint8_t * hwmp_add_meshprep(uint8_t *,
  78                     const struct ieee80211_meshprep_ie *);
  79 static uint8_t * hwmp_add_meshperr(uint8_t *,
  80                     const struct ieee80211_meshperr_ie *);
  81 static uint8_t * hwmp_add_meshrann(uint8_t *,
  82                     const struct ieee80211_meshrann_ie *);
  83 static void     hwmp_rootmode_setup(struct ieee80211vap *);
  84 static void     hwmp_rootmode_cb(void *);
  85 static void     hwmp_rootmode_rann_cb(void *);
  86 static void     hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
  87                     const struct ieee80211_frame *,
  88                     const struct ieee80211_meshpreq_ie *);
  89 static int      hwmp_send_preq(struct ieee80211vap *,
  90                     const uint8_t [IEEE80211_ADDR_LEN],
  91                     struct ieee80211_meshpreq_ie *,
  92                     struct timeval *, struct timeval *);
  93 static void     hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
  94                     const struct ieee80211_frame *,
  95                     const struct ieee80211_meshprep_ie *);
  96 static int      hwmp_send_prep(struct ieee80211vap *,
  97                     const uint8_t [IEEE80211_ADDR_LEN],
  98                     struct ieee80211_meshprep_ie *);
  99 static void     hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
 100                     const struct ieee80211_frame *,
 101                     const struct ieee80211_meshperr_ie *);
 102 static int      hwmp_send_perr(struct ieee80211vap *,
 103                     const uint8_t [IEEE80211_ADDR_LEN],
 104                     struct ieee80211_meshperr_ie *);
 105 static void     hwmp_senderror(struct ieee80211vap *,
 106                     const uint8_t [IEEE80211_ADDR_LEN],
 107                     struct ieee80211_mesh_route *, int);
 108 static void     hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
 109                    const struct ieee80211_frame *,
 110                    const struct ieee80211_meshrann_ie *);
 111 static int      hwmp_send_rann(struct ieee80211vap *,
 112                     const uint8_t [IEEE80211_ADDR_LEN],
 113                     struct ieee80211_meshrann_ie *);
 114 static struct ieee80211_node *
 115                 hwmp_discover(struct ieee80211vap *,
 116                     const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
 117 static void     hwmp_peerdown(struct ieee80211_node *);
 118
 119 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
 120 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
 121
 122 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
 123 static const uint8_t    broadcastaddr[IEEE80211_ADDR_LEN] =
 124         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 125
 126 typedef uint32_t ieee80211_hwmp_seq;
 127 #define HWMP_SEQ_LT(a, b)       ((int32_t)((a)-(b)) < 0)
 128 #define HWMP_SEQ_LEQ(a, b)      ((int32_t)((a)-(b)) <= 0)
 129 #define HWMP_SEQ_EQ(a, b)       ((int32_t)((a)-(b)) == 0)
 130 #define HWMP_SEQ_GT(a, b)       ((int32_t)((a)-(b)) > 0)
 131
 132 #define HWMP_SEQ_MAX(a, b)      (a > b ? a : b)
 133
 134 /*
 135  * Private extension of ieee80211_mesh_route.
 136  */
 137 struct ieee80211_hwmp_route {
 138         ieee80211_hwmp_seq      hr_seq;         /* last HWMP seq seen from dst*/
 139         ieee80211_hwmp_seq      hr_preqid;      /* last PREQ ID seen from dst */
 140         ieee80211_hwmp_seq      hr_origseq;     /* seq. no. on our latest PREQ*/
 141         struct timeval          hr_lastpreq;    /* last time we sent a PREQ */
 142         struct timeval          hr_lastrootconf; /* last sent PREQ root conf */
 143         int                     hr_preqretries; /* number of discoveries */
 144         int                     hr_lastdiscovery; /* last discovery in ticks */
 145 };
 146 struct ieee80211_hwmp_state {
 147         ieee80211_hwmp_seq      hs_seq;         /* next seq to be used */
 148         ieee80211_hwmp_seq      hs_preqid;      /* next PREQ ID to be used */
 149         int                     hs_rootmode;    /* proactive HWMP */
 150         struct timeval          hs_lastperr;    /* last time we sent a PERR */
 151         struct callout          hs_roottimer;
 152         uint8_t                 hs_maxhops;     /* max hop count */
 153 };
 154
 155 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
 156     "IEEE 802.11s HWMP parameters");
 157 static int      ieee80211_hwmp_targetonly = 0;
 158 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
 159     &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
 160 static int      ieee80211_hwmp_pathtimeout = -1;
 161 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime,
 162     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 163     &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 164     "path entry lifetime (ms)");
 165 static int      ieee80211_hwmp_maxpreq_retries = -1;
 166 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries,
 167     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 168     &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
 169     "maximum number of preq retries");
 170 static int      ieee80211_hwmp_net_diameter_traversaltime = -1;
 171 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
 172     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 173     &ieee80211_hwmp_net_diameter_traversaltime, 0,
 174     ieee80211_sysctl_msecs_ticks, "I",
 175     "estimate travelse time across the MBSS (ms)");
 176 static int      ieee80211_hwmp_roottimeout = -1;
 177 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout,
 178     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 179     &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 180     "root PREQ timeout (ms)");
 181 static int      ieee80211_hwmp_rootint = -1;
 182 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint,
 183     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 184     &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
 185     "root interval (ms)");
 186 static int      ieee80211_hwmp_rannint = -1;
 187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint,
 188     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 189     &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
 190     "root announcement interval (ms)");
 191 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
 192 static int      ieee80211_hwmp_rootconfint_internal = -1;
 193 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint,
 194     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
 195     &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
 196     "root confirmation interval (ms) (read-only)");
 197
 198 #define IEEE80211_HWMP_DEFAULT_MAXHOPS  31
 199
 200 static  ieee80211_recv_action_func hwmp_recv_action_meshpath;
 201
 202 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
 203         .mpp_descr      = "HWMP",
 204         .mpp_ie         = IEEE80211_MESHCONF_PATH_HWMP,
 205         .mpp_discover   = hwmp_discover,
 206         .mpp_peerdown   = hwmp_peerdown,
 207         .mpp_senderror  = hwmp_senderror,
 208         .mpp_vattach    = hwmp_vattach,
 209         .mpp_vdetach    = hwmp_vdetach,
 210         .mpp_newstate   = hwmp_newstate,
 211         .mpp_privlen    = sizeof(struct ieee80211_hwmp_route),
 212 };
 213 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact,
 214     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 215     &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
 216     "mesh route inactivity timeout (ms)");
 217
 218 static void
 219 ieee80211_hwmp_init(void)
 220 {
 221         /* Default values as per amendment */
 222         ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
 223         ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
 224         ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
 225         ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
 226         ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
 227         ieee80211_hwmp_maxpreq_retries = 3;
 228         /*
 229          * (TU): A measurement of time equal to 1024 μs,
 230          * 500 TU is 512 ms.
 231          */
 232         ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
 233
 234         /*
 235          * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
 236          * and return a struct timeval...
 237          */
 238         ieee80211_hwmp_rootconfint.tv_usec =
 239             ieee80211_hwmp_rootconfint_internal * 1000;
 240
 241         /*
 242          * Register action frame handler.
 243          */
 244         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
 245             IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
 246
 247         /* NB: default is 5 secs per spec */
 248         mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
 249
 250         /*
 251          * Register HWMP.
 252          */
 253         ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
 254 }
 255 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
 256
 257 static void
 258 hwmp_vattach(struct ieee80211vap *vap)
 259 {
 260         struct ieee80211_hwmp_state *hs;
 261
 262         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
 263             ("not a mesh vap, opmode %d", vap->iv_opmode));
 264
 265         hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
 266             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
 267         if (hs == NULL) {
 268                 printf("%s: couldn't alloc HWMP state\n", __func__);
 269                 return;
 270         }
 271         hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
 272         callout_init(&hs->hs_roottimer, 1);
 273         vap->iv_hwmp = hs;
 274 }
 275
 276 static void
 277 hwmp_vdetach(struct ieee80211vap *vap)
 278 {
 279         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 280
 281         callout_drain(&hs->hs_roottimer);
 282         IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
 283         vap->iv_hwmp = NULL;
 284 }
 285
 286 static int
 287 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
 288 {
 289         enum ieee80211_state nstate = vap->iv_state;
 290         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 291
 292         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 293             __func__, ieee80211_state_name[ostate],
 294             ieee80211_state_name[nstate], arg);
 295
 296         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
 297                 callout_drain(&hs->hs_roottimer);
 298         if (nstate == IEEE80211_S_RUN)
 299                 hwmp_rootmode_setup(vap);
 300         return 0;
 301 }
 302
 303 /*
 304  * Verify the length of an HWMP PREQ and return the number
 305  * of destinations >= 1, if verification fails -1 is returned.
 306  */
 307 static int
 308 verify_mesh_preq_len(struct ieee80211vap *vap,
 309     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 310 {
 311         int alloc_sz = -1;
 312         int ndest = -1;
 313         if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
 314                 /* Originator External Address  present */
 315                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ_AE;
 316                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
 317         } else {
 318                 /* w/o Originator External Address */
 319                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ;
 320                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
 321         }
 322         alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
 323
 324         if(iefrm[1] != (alloc_sz)) {
 325                 IEEE80211_DISCARD(vap,
 326                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 327                     wh, NULL, "PREQ (AE=%s) with wrong len",
 328                     iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0");
 329                 return (-1);
 330         }
 331         return ndest;
 332 }
 333
 334 /*
 335  * Verify the length of an HWMP PREP and returns 1 on success,
 336  * otherwise -1.
 337  */
 338 static int
 339 verify_mesh_prep_len(struct ieee80211vap *vap,
 340     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 341 {
 342         int alloc_sz = -1;
 343         if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
 344                 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
 345                         alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
 346         } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
 347                 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
 348         if(alloc_sz < 0) {
 349                 IEEE80211_DISCARD(vap,
 350                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 351                     wh, NULL, "PREP (AE=%s) with wrong len",
 352                     iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0");
 353                 return (-1);
 354         }
 355         return (1);
 356 }
 357
 358 /*
 359  * Verify the length of an HWMP PERR and return the number
 360  * of destinations >= 1, if verification fails -1 is returned.
 361  */
 362 static int
 363 verify_mesh_perr_len(struct ieee80211vap *vap,
 364     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 365 {
 366         int alloc_sz = -1;
 367         const uint8_t *iefrm_t = iefrm;
 368         uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
 369         int i;
 370
 371         if(ndest > IEEE80211_MESHPERR_MAXDEST) {
 372                 IEEE80211_DISCARD(vap,
 373                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 374                     wh, NULL, "PERR with wrong number of destionat (>19), %u",
 375                     ndest);
 376                 return (-1);
 377         }
 378
 379         iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
 380         /* We need to check each destination flag to know size */
 381         for(i = 0; i<ndest; i++) {
 382                 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
 383                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
 384                 else
 385                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
 386         }
 387
 388         alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
 389         if(alloc_sz !=  iefrm[1]) {
 390                 IEEE80211_DISCARD(vap,
 391                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 392                     wh, NULL, "%s", "PERR with wrong len");
 393                 return (-1);
 394         }
 395         return ndest;
 396 }
 397
 398 static int
 399 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
 400         const struct ieee80211_frame *wh,
 401         const uint8_t *frm, const uint8_t *efrm)
 402 {
 403         struct ieee80211vap *vap = ni->ni_vap;
 404         struct ieee80211_meshpreq_ie *preq;
 405         struct ieee80211_meshprep_ie *prep;
 406         struct ieee80211_meshperr_ie *perr;
 407         struct ieee80211_meshrann_ie rann;
 408         const uint8_t *iefrm = frm + 2; /* action + code */
 409         const uint8_t *iefrm_t = iefrm; /* temporary pointer */
 410         int ndest = -1;
 411         int found = 0;
 412
 413         while (efrm - iefrm > 1) {
 414                 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
 415                 switch (*iefrm) {
 416                 case IEEE80211_ELEMID_MESHPREQ:
 417                 {
 418                         int i = 0;
 419
 420                         iefrm_t = iefrm;
 421                         ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
 422                         if (ndest < 0) {
 423                                 vap->iv_stats.is_rx_mgtdiscard++;
 424                                 break;
 425                         }
 426                         preq = IEEE80211_MALLOC(sizeof(*preq) +
 427                             (ndest - 1) * sizeof(*preq->preq_targets),
 428                             M_80211_MESH_PREQ,
 429                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
 430                         KASSERT(preq != NULL, ("preq == NULL"));
 431
 432                         preq->preq_ie = *iefrm_t++;
 433                         preq->preq_len = *iefrm_t++;
 434                         preq->preq_flags = *iefrm_t++;
 435                         preq->preq_hopcount = *iefrm_t++;
 436                         preq->preq_ttl = *iefrm_t++;
 437                         preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
 438                         IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
 439                         iefrm_t += 6;
 440                         preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
 441                         /* NB: may have Originator Proxied Address */
 442                         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE)  {
 443                                 IEEE80211_ADDR_COPY(
 444                                     preq->preq_orig_ext_addr, iefrm_t);
 445                                 iefrm_t += 6;
 446                         }
 447                         preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
 448                         preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
 449                         preq->preq_tcount = *iefrm_t++;
 450
 451                         for (i = 0; i < preq->preq_tcount; i++) {
 452                                 preq->preq_targets[i].target_flags = *iefrm_t++;
 453                                 IEEE80211_ADDR_COPY(
 454                                     preq->preq_targets[i].target_addr, iefrm_t);
 455                                 iefrm_t += 6;
 456                                 preq->preq_targets[i].target_seq =
 457                                     le32dec(iefrm_t);
 458                                 iefrm_t += 4;
 459                         }
 460
 461                         hwmp_recv_preq(vap, ni, wh, preq);
 462                         IEEE80211_FREE(preq, M_80211_MESH_PREQ);
 463                         found++;
 464                         break;
 465                 }
 466                 case IEEE80211_ELEMID_MESHPREP:
 467                 {
 468                         iefrm_t = iefrm;
 469                         ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
 470                         if (ndest < 0) {
 471                                 vap->iv_stats.is_rx_mgtdiscard++;
 472                                 break;
 473                         }
 474                         prep = IEEE80211_MALLOC(sizeof(*prep),
 475                             M_80211_MESH_PREP,
 476                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
 477                         KASSERT(prep != NULL, ("prep == NULL"));
 478
 479                         prep->prep_ie = *iefrm_t++;
 480                         prep->prep_len = *iefrm_t++;
 481                         prep->prep_flags = *iefrm_t++;
 482                         prep->prep_hopcount = *iefrm_t++;
 483                         prep->prep_ttl = *iefrm_t++;
 484                         IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
 485                         iefrm_t += 6;
 486                         prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
 487                         /* NB: May have Target Proxied Address */
 488                         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE)  {
 489                                 IEEE80211_ADDR_COPY(
 490                                     prep->prep_target_ext_addr, iefrm_t);
 491                                 iefrm_t += 6;
 492                         }
 493                         prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
 494                         prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
 495                         IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
 496                         iefrm_t += 6;
 497                         prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
 498
 499                         hwmp_recv_prep(vap, ni, wh, prep);
 500                         IEEE80211_FREE(prep, M_80211_MESH_PREP);
 501                         found++;
 502                         break;
 503                 }
 504                 case IEEE80211_ELEMID_MESHPERR:
 505                 {
 506                         int i = 0;
 507
 508                         iefrm_t = iefrm;
 509                         ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
 510                         if (ndest < 0) {
 511                                 vap->iv_stats.is_rx_mgtdiscard++;
 512                                 break;
 513                         }
 514                         perr = IEEE80211_MALLOC(sizeof(*perr) +
 515                             (ndest - 1) * sizeof(*perr->perr_dests),
 516                             M_80211_MESH_PERR,
 517                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
 518                         KASSERT(perr != NULL, ("perr == NULL"));
 519
 520                         perr->perr_ie = *iefrm_t++;
 521                         perr->perr_len = *iefrm_t++;
 522                         perr->perr_ttl = *iefrm_t++;
 523                         perr->perr_ndests = *iefrm_t++;
 524
 525                         for (i = 0; i<perr->perr_ndests; i++) {
 526                                 perr->perr_dests[i].dest_flags = *iefrm_t++;
 527                                 IEEE80211_ADDR_COPY(
 528                                     perr->perr_dests[i].dest_addr, iefrm_t);
 529                                 iefrm_t += 6;
 530                                 perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
 531                                 iefrm_t += 4;
 532                                 /* NB: May have Target Proxied Address */
 533                                 if (perr->perr_dests[i].dest_flags &
 534                                     IEEE80211_MESHPERR_FLAGS_AE) {
 535                                         IEEE80211_ADDR_COPY(
 536                                             perr->perr_dests[i].dest_ext_addr,
 537                                             iefrm_t);
 538                                         iefrm_t += 6;
 539                                 }
 540                                 perr->perr_dests[i].dest_rcode =
 541                                     le16dec(iefrm_t);
 542                                 iefrm_t += 2;
 543                         }
 544
 545                         hwmp_recv_perr(vap, ni, wh, perr);
 546                         IEEE80211_FREE(perr, M_80211_MESH_PERR);
 547                         found++;
 548                         break;
 549                 }
 550                 case IEEE80211_ELEMID_MESHRANN:
 551                 {
 552                         const struct ieee80211_meshrann_ie *mrann =
 553                             (const struct ieee80211_meshrann_ie *) iefrm;
 554                         if (mrann->rann_len !=
 555                             sizeof(struct ieee80211_meshrann_ie) - 2) {
 556                                 IEEE80211_DISCARD(vap,
 557                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 558                                     wh, NULL, "%s", "RAN with wrong len");
 559                                     vap->iv_stats.is_rx_mgtdiscard++;
 560                                 return 1;
 561                         }
 562                         memcpy(&rann, mrann, sizeof(rann));
 563                         rann.rann_seq = le32dec(&mrann->rann_seq);
 564                         rann.rann_interval = le32dec(&mrann->rann_interval);
 565                         rann.rann_metric = le32dec(&mrann->rann_metric);
 566                         hwmp_recv_rann(vap, ni, wh, &rann);
 567                         found++;
 568                         break;
 569                 }
 570                 }
 571                 iefrm += iefrm[1] + 2;
 572         }
 573         if (!found) {
 574                 IEEE80211_DISCARD(vap,
 575                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 576                     wh, NULL, "%s", "PATH SEL action without IE");
 577                 vap->iv_stats.is_rx_mgtdiscard++;
 578         }
 579         return 0;
 580 }
 581
 582 static int
 583 hwmp_send_action(struct ieee80211vap *vap,
 584     const uint8_t da[IEEE80211_ADDR_LEN],
 585     uint8_t *ie, size_t len)
 586 {
 587         struct ieee80211_node *ni;
 588         struct ieee80211com *ic;
 589         struct ieee80211_bpf_params params;
 590         struct mbuf *m;
 591         uint8_t *frm;
 592         int ret;
 593
 594         if (IEEE80211_IS_MULTICAST(da)) {
 595                 ni = ieee80211_ref_node(vap->iv_bss);
 596 #ifdef IEEE80211_DEBUG_REFCNT
 597                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 598                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 599                 __func__, __LINE__,
 600                 ni, ether_sprintf(ni->ni_macaddr),
 601                 ieee80211_node_refcnt(ni)+1);
 602 #endif
 603                 ieee80211_ref_node(ni);
 604         }
 605         else
 606                 ni = ieee80211_mesh_find_txnode(vap, da);
 607
 608         if (vap->iv_state == IEEE80211_S_CAC) {
 609                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
 610                     "block %s frame in CAC state", "HWMP action");
 611                 vap->iv_stats.is_tx_badstate++;
 612                 return EIO;     /* XXX */
 613         }
 614
 615         KASSERT(ni != NULL, ("null node"));
 616         ic = ni->ni_ic;
 617
 618         m = ieee80211_getmgtframe(&frm,
 619             ic->ic_headroom + sizeof(struct ieee80211_frame),
 620             sizeof(struct ieee80211_action) + len
 621         );
 622         if (m == NULL) {
 623                 ieee80211_free_node(ni);
 624                 vap->iv_stats.is_tx_nobuf++;
 625                 return ENOMEM;
 626         }
 627         *frm++ = IEEE80211_ACTION_CAT_MESH;
 628         *frm++ = IEEE80211_ACTION_MESH_HWMP;
 629         switch (*ie) {
 630         case IEEE80211_ELEMID_MESHPREQ:
 631                 frm = hwmp_add_meshpreq(frm,
 632                     (struct ieee80211_meshpreq_ie *)ie);
 633                 break;
 634         case IEEE80211_ELEMID_MESHPREP:
 635                 frm = hwmp_add_meshprep(frm,
 636                     (struct ieee80211_meshprep_ie *)ie);
 637                 break;
 638         case IEEE80211_ELEMID_MESHPERR:
 639                 frm = hwmp_add_meshperr(frm,
 640                     (struct ieee80211_meshperr_ie *)ie);
 641                 break;
 642         case IEEE80211_ELEMID_MESHRANN:
 643                 frm = hwmp_add_meshrann(frm,
 644                     (struct ieee80211_meshrann_ie *)ie);
 645                 break;
 646         }
 647
 648         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 649         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
 650         if (m == NULL) {
 651                 ieee80211_free_node(ni);
 652                 vap->iv_stats.is_tx_nobuf++;
 653                 return ENOMEM;
 654         }
 655
 656         IEEE80211_TX_LOCK(ic);
 657
 658         ieee80211_send_setup(ni, m,
 659             IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
 660             IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
 661
 662         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 663         IEEE80211_NODE_STAT(ni, tx_mgmt);
 664
 665         memset(&params, 0, sizeof(params));
 666         params.ibp_pri = WME_AC_VO;
 667         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 668         if (IEEE80211_IS_MULTICAST(da))
 669                 params.ibp_try0 = 1;
 670         else
 671                 params.ibp_try0 = ni->ni_txparms->maxretry;
 672         params.ibp_power = ni->ni_txpower;
 673         ret = ieee80211_raw_output(vap, ni, m, &params);
 674         IEEE80211_TX_UNLOCK(ic);
 675         return (ret);
 676 }
 677
 678 #define ADDSHORT(frm, v) do {           \
 679         le16enc(frm, v);                \
 680         frm += 2;                       \
 681 } while (0)
 682 #define ADDWORD(frm, v) do {            \
 683         le32enc(frm, v);                \
 684         frm += 4;                       \
 685 } while (0)
 686 /*
 687  * Add a Mesh Path Request IE to a frame.
 688  */
 689 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
 690 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
 691 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
 692 static uint8_t *
 693 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
 694 {
 695         int i;
 696
 697         *frm++ = IEEE80211_ELEMID_MESHPREQ;
 698         *frm++ = preq->preq_len;        /* len already calculated */
 699         *frm++ = preq->preq_flags;
 700         *frm++ = preq->preq_hopcount;
 701         *frm++ = preq->preq_ttl;
 702         ADDWORD(frm, preq->preq_id);
 703         IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
 704         ADDWORD(frm, preq->preq_origseq);
 705         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
 706                 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
 707                 frm += 6;
 708         }
 709         ADDWORD(frm, preq->preq_lifetime);
 710         ADDWORD(frm, preq->preq_metric);
 711         *frm++ = preq->preq_tcount;
 712         for (i = 0; i < preq->preq_tcount; i++) {
 713                 *frm++ = PREQ_TFLAGS(i);
 714                 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
 715                 frm += 6;
 716                 ADDWORD(frm, PREQ_TSEQ(i));
 717         }
 718         return frm;
 719 }
 720 #undef  PREQ_TFLAGS
 721 #undef  PREQ_TADDR
 722 #undef  PREQ_TSEQ
 723
 724 /*
 725  * Add a Mesh Path Reply IE to a frame.
 726  */
 727 static uint8_t *
 728 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
 729 {
 730         *frm++ = IEEE80211_ELEMID_MESHPREP;
 731         *frm++ = prep->prep_len;        /* len already calculated */
 732         *frm++ = prep->prep_flags;
 733         *frm++ = prep->prep_hopcount;
 734         *frm++ = prep->prep_ttl;
 735         IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
 736         ADDWORD(frm, prep->prep_targetseq);
 737         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
 738                 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
 739                 frm += 6;
 740         }
 741         ADDWORD(frm, prep->prep_lifetime);
 742         ADDWORD(frm, prep->prep_metric);
 743         IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
 744         ADDWORD(frm, prep->prep_origseq);
 745         return frm;
 746 }
 747
 748 /*
 749  * Add a Mesh Path Error IE to a frame.
 750  */
 751 #define PERR_DFLAGS(n)  perr->perr_dests[n].dest_flags
 752 #define PERR_DADDR(n)   perr->perr_dests[n].dest_addr
 753 #define PERR_DSEQ(n)    perr->perr_dests[n].dest_seq
 754 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
 755 #define PERR_DRCODE(n)  perr->perr_dests[n].dest_rcode
 756 static uint8_t *
 757 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
 758 {
 759         int i;
 760
 761         *frm++ = IEEE80211_ELEMID_MESHPERR;
 762         *frm++ = perr->perr_len;        /* len already calculated */
 763         *frm++ = perr->perr_ttl;
 764         *frm++ = perr->perr_ndests;
 765         for (i = 0; i < perr->perr_ndests; i++) {
 766                 *frm++ = PERR_DFLAGS(i);
 767                 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
 768                 frm += 6;
 769                 ADDWORD(frm, PERR_DSEQ(i));
 770                 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
 771                         IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
 772                         frm += 6;
 773                 }
 774                 ADDSHORT(frm, PERR_DRCODE(i));
 775         }
 776         return frm;
 777 }
 778 #undef  PERR_DFLAGS
 779 #undef  PERR_DADDR
 780 #undef  PERR_DSEQ
 781 #undef  PERR_EXTADDR
 782 #undef  PERR_DRCODE
 783
 784 /*
 785  * Add a Root Annoucement IE to a frame.
 786  */
 787 static uint8_t *
 788 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
 789 {
 790         *frm++ = IEEE80211_ELEMID_MESHRANN;
 791         *frm++ = rann->rann_len;
 792         *frm++ = rann->rann_flags;
 793         *frm++ = rann->rann_hopcount;
 794         *frm++ = rann->rann_ttl;
 795         IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
 796         ADDWORD(frm, rann->rann_seq);
 797         ADDWORD(frm, rann->rann_interval);
 798         ADDWORD(frm, rann->rann_metric);
 799         return frm;
 800 }
 801
 802 static void
 803 hwmp_rootmode_setup(struct ieee80211vap *vap)
 804 {
 805         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 806         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 807
 808         switch (hs->hs_rootmode) {
 809         case IEEE80211_HWMP_ROOTMODE_DISABLED:
 810                 callout_drain(&hs->hs_roottimer);
 811                 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
 812                 break;
 813         case IEEE80211_HWMP_ROOTMODE_NORMAL:
 814         case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
 815                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
 816                     hwmp_rootmode_cb, vap);
 817                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
 818                 break;
 819         case IEEE80211_HWMP_ROOTMODE_RANN:
 820                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
 821                     hwmp_rootmode_rann_cb, vap);
 822                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
 823                 break;
 824         }
 825 }
 826
 827 /*
 828  * Send a broadcast Path Request to find all nodes on the mesh. We are
 829  * called when the vap is configured as a HWMP root node.
 830  */
 831 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
 832 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
 833 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
 834 static void
 835 hwmp_rootmode_cb(void *arg)
 836 {
 837         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 838         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 839         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 840         struct ieee80211_meshpreq_ie preq;
 841
 842         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 843             "%s", "send broadcast PREQ");
 844
 845         preq.preq_flags = 0;
 846         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
 847                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
 848         if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
 849                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
 850         preq.preq_hopcount = 0;
 851         preq.preq_ttl = ms->ms_ttl;
 852         preq.preq_id = ++hs->hs_preqid;
 853         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 854         preq.preq_origseq = ++hs->hs_seq;
 855         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
 856         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 857         preq.preq_tcount = 1;
 858         IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
 859         PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
 860             IEEE80211_MESHPREQ_TFLAGS_USN;
 861         PREQ_TSEQ(0) = 0;
 862         vap->iv_stats.is_hwmp_rootreqs++;
 863         /* NB: we enforce rate check ourself */
 864         hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
 865         hwmp_rootmode_setup(vap);
 866 }
 867 #undef  PREQ_TFLAGS
 868 #undef  PREQ_TADDR
 869 #undef  PREQ_TSEQ
 870
 871 /*
 872  * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
 873  * called when the vap is configured as a HWMP RANN root node.
 874  */
 875 static void
 876 hwmp_rootmode_rann_cb(void *arg)
 877 {
 878         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 879         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 880         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 881         struct ieee80211_meshrann_ie rann;
 882
 883         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 884             "%s", "send broadcast RANN");
 885
 886         rann.rann_flags = 0;
 887         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
 888                 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
 889         rann.rann_hopcount = 0;
 890         rann.rann_ttl = ms->ms_ttl;
 891         IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
 892         rann.rann_seq = ++hs->hs_seq;
 893         rann.rann_interval = ieee80211_hwmp_rannint;
 894         rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 895
 896         vap->iv_stats.is_hwmp_rootrann++;
 897         hwmp_send_rann(vap, broadcastaddr, &rann);
 898         hwmp_rootmode_setup(vap);
 899 }
 900
 901 /*
 902  * Update forwarding information to TA if metric improves.
 903  */
 904 static void
 905 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
 906     const char *hwmp_frame)
 907 {
 908         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 909         struct ieee80211_mesh_route *rttran = NULL;     /* Transmitter */
 910         int metric = 0;
 911
 912         rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
 913         if (rttran == NULL) {
 914                 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
 915                 if (rttran == NULL) {
 916                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 917                             "unable to add path to transmitter %6D of %s",
 918                             ni->ni_macaddr, ":", hwmp_frame);
 919                         vap->iv_stats.is_mesh_rtaddfailed++;
 920                         return;
 921                 }
 922         }
 923         metric = ms->ms_pmetric->mpm_metric(ni);
 924         if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
 925             rttran->rt_metric > metric)
 926         {
 927                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 928                     "%s path to transmitter %6D of %s, metric %d:%d",
 929                     rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
 930                     "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
 931                     rttran->rt_metric, metric);
 932                 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
 933                 rttran->rt_metric = metric;
 934                 rttran->rt_nhops  = 1;
 935                 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
 936                 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
 937         }
 938 }
 939
 940 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
 941 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
 942 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
 943 static void
 944 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
 945     const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
 946 {
 947         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 948         struct ieee80211_mesh_route *rtorig = NULL;
 949         struct ieee80211_mesh_route *rtorig_ext = NULL;
 950         struct ieee80211_mesh_route *rttarg = NULL;
 951         struct ieee80211_hwmp_route *hrorig = NULL;
 952         struct ieee80211_hwmp_route *hrtarg = NULL;
 953         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 954         ieee80211_hwmp_seq preqid;      /* last seen preqid for orig */
 955         uint32_t metric = 0;
 956
 957         /*
 958          * Ignore PREQs from us. Could happen because someone forward it
 959          * back to us.
 960          */
 961         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
 962                 return;
 963
 964         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 965             "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
 966             PREQ_TADDR(0), ":");
 967
 968         /*
 969          * Acceptance criteria: (if the PREQ is not for us or not broadcast,
 970          * or an external mac address not proxied by us),
 971          * AND forwarding is disabled, discard this PREQ.
 972          */
 973         rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
 974         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
 975             (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
 976             !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
 977             (rttarg != NULL &&
 978             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
 979             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
 980                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 981                     preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
 982                 return;
 983         }
 984         /*
 985          * Acceptance criteria: if unicast addressed
 986          * AND no valid forwarding for Target of PREQ, discard this PREQ.
 987          */
 988         if(rttarg != NULL)
 989                 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
 990                     struct ieee80211_hwmp_route);
 991         /* Address mode: ucast */
 992         if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
 993             rttarg == NULL &&
 994             !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
 995                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 996                     preq->preq_origaddr, NULL,
 997                     "unicast addressed PREQ of unknown target %6D",
 998                     PREQ_TADDR(0), ":");
 999                 return;
1000         }
1001
1002         /* PREQ ACCEPTED */
1003
1004         rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
1005         if (rtorig == NULL) {
1006                 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
1007                 if (rtorig == NULL) {
1008                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1009                             "unable to add orig path to %6D",
1010                             preq->preq_origaddr, ":");
1011                         vap->iv_stats.is_mesh_rtaddfailed++;
1012                         return;
1013                 }
1014                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1015                     "adding originator %6D", preq->preq_origaddr, ":");
1016         }
1017         hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
1018
1019         /* record last seen preqid */
1020         preqid = hrorig->hr_preqid;
1021         hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
1022
1023         /* Data creation and update of forwarding information
1024          * according to Table 11C-8 for originator mesh STA.
1025          */
1026         metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
1027         if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
1028             (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
1029             metric < rtorig->rt_metric)) {
1030                 hrorig->hr_seq = preq->preq_origseq;
1031                 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
1032                 rtorig->rt_metric = metric;
1033                 rtorig->rt_nhops  = preq->preq_hopcount + 1;
1034                 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
1035                 /* Path to orig is valid now.
1036                  * NB: we know it can't be Proxy, and if it is GATE
1037                  * it will be marked below.
1038                  */
1039                 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
1040         } else if ((hrtarg != NULL &&
1041             !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
1042             (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1043             preqid >= preq->preq_id)) {
1044                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1045                     "discard PREQ from %6D, old seqno %u <= %u,"
1046                     " or old preqid %u < %u",
1047                     preq->preq_origaddr, ":",
1048                     preq->preq_origseq, hrorig->hr_seq,
1049                     preq->preq_id, preqid);
1050                 return;
1051         }
1052
1053         /* Update forwarding information to TA if metric improves. */
1054         hwmp_update_transmitter(vap, ni, "PREQ");
1055
1056         /*
1057          * Check if the PREQ is addressed to us.
1058          * or a Proxy currently gated by us.
1059          */
1060         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1061             (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
1062             rttarg != NULL &&
1063             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
1064             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1065             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1066                 struct ieee80211_meshprep_ie prep;
1067
1068                 /*
1069                  * When we are the target we shall update our own HWMP seq
1070                  * number with max of (current and preq->seq) + 1
1071                  */
1072                 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
1073
1074                 prep.prep_flags = 0;
1075                 prep.prep_hopcount = 0;
1076                 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1077                 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
1078                 if (rttarg != NULL && /* if NULL it means we are the target */
1079                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1080                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1081                             "reply for proxy %6D", rttarg->rt_dest, ":");
1082                         prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
1083                         IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
1084                             rttarg->rt_dest);
1085                         /* update proxy seqno to HWMP seqno */
1086                         rttarg->rt_ext_seq = hs->hs_seq;
1087                         prep.prep_hopcount = rttarg->rt_nhops;
1088                         prep.prep_metric = rttarg->rt_metric;
1089                         IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
1090                 }
1091                 /*
1092                  * Build and send a PREP frame.
1093                  */
1094                 prep.prep_ttl = ms->ms_ttl;
1095                 prep.prep_targetseq = hs->hs_seq;
1096                 prep.prep_lifetime = preq->preq_lifetime;
1097                 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
1098                 prep.prep_origseq = preq->preq_origseq;
1099
1100                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1101                     "reply to %6D", preq->preq_origaddr, ":");
1102                 hwmp_send_prep(vap, wh->i_addr2, &prep);
1103                 return;
1104         }
1105         /* we may update our proxy information for the orig external */
1106         else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
1107                 rtorig_ext =
1108                     ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
1109                 if (rtorig_ext == NULL) {
1110                         rtorig_ext = ieee80211_mesh_rt_add(vap,
1111                             preq->preq_orig_ext_addr);
1112                         if (rtorig_ext == NULL) {
1113                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1114                                     "unable to add orig ext proxy to %6D",
1115                                     preq->preq_orig_ext_addr, ":");
1116                                 vap->iv_stats.is_mesh_rtaddfailed++;
1117                                 return;
1118                         }
1119                         IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
1120                             preq->preq_origaddr);
1121                 }
1122                 rtorig_ext->rt_ext_seq = preq->preq_origseq;
1123                 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
1124         }
1125         /*
1126          * Proactive PREQ: reply with a proactive PREP to the
1127          * root STA if requested.
1128          */
1129         if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
1130             (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
1131                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1132                     "root mesh station @ %6D", preq->preq_origaddr, ":");
1133
1134                 /* Check if root is a mesh gate, mark it */
1135                 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
1136                         struct ieee80211_mesh_gate_route *gr;
1137
1138                         rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1139                         gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
1140                             rtorig);
1141                         gr->gr_lastseq = 0; /* NOT GANN */
1142                 }
1143
1144                 /*
1145                  * Reply with a PREP if we don't have a path to the root
1146                  * or if the root sent us a proactive PREQ.
1147                  */
1148                 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1149                     (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
1150                         struct ieee80211_meshprep_ie prep;
1151
1152                         prep.prep_flags = 0;
1153                         prep.prep_hopcount = 0;
1154                         prep.prep_ttl = ms->ms_ttl;
1155                         IEEE80211_ADDR_COPY(prep.prep_origaddr,
1156                             preq->preq_origaddr);
1157                         prep.prep_origseq = preq->preq_origseq;
1158                         prep.prep_lifetime = preq->preq_lifetime;
1159                         prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1160                         IEEE80211_ADDR_COPY(prep.prep_targetaddr,
1161                             vap->iv_myaddr);
1162                         prep.prep_targetseq = ++hs->hs_seq;
1163                         hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1164                 }
1165         }
1166
1167         /*
1168          * Forwarding and Intermediate reply for PREQs with 1 target.
1169          */
1170         if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
1171             (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1172                 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
1173
1174                 memcpy(&ppreq, preq, sizeof(ppreq));
1175
1176                 /*
1177                  * We have a valid route to this node.
1178                  * NB: if target is proxy dont reply.
1179                  */
1180                 if (rttarg != NULL &&
1181                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1182                     !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
1183                         /*
1184                          * Check if we can send an intermediate Path Reply,
1185                          * i.e., Target Only bit is not set and target is not
1186                          * the MAC broadcast address.
1187                          */
1188                         if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
1189                             !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
1190                                 struct ieee80211_meshprep_ie prep;
1191
1192                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1193                                     "intermediate reply for PREQ from %6D",
1194                                     preq->preq_origaddr, ":");
1195                                 prep.prep_flags = 0;
1196                                 prep.prep_hopcount = rttarg->rt_nhops;
1197                                 prep.prep_ttl = ms->ms_ttl;
1198                                 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
1199                                     PREQ_TADDR(0));
1200                                 prep.prep_targetseq = hrtarg->hr_seq;
1201                                 prep.prep_lifetime = preq->preq_lifetime;
1202                                 prep.prep_metric =rttarg->rt_metric;
1203                                 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
1204                                     preq->preq_origaddr);
1205                                 prep.prep_origseq = hrorig->hr_seq;
1206                                 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1207
1208                                 /*
1209                                  * Set TO and unset RF bits because we have
1210                                  * sent a PREP.
1211                                  */
1212                                 ppreq.preq_targets[0].target_flags |=
1213                                     IEEE80211_MESHPREQ_TFLAGS_TO;
1214                         }
1215                 }
1216
1217                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1218                     "forward PREQ from %6D",
1219                     preq->preq_origaddr, ":");
1220                 ppreq.preq_hopcount += 1;
1221                 ppreq.preq_ttl -= 1;
1222                 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
1223
1224                 /* don't do PREQ ratecheck when we propagate */
1225                 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
1226         }
1227 }
1228 #undef  PREQ_TFLAGS
1229 #undef  PREQ_TADDR
1230 #undef  PREQ_TSEQ
1231
1232 static int
1233 hwmp_send_preq(struct ieee80211vap *vap,
1234     const uint8_t da[IEEE80211_ADDR_LEN],
1235     struct ieee80211_meshpreq_ie *preq,
1236     struct timeval *last, struct timeval *minint)
1237 {
1238
1239         /*
1240          * Enforce PREQ interval.
1241          * NB: Proactive ROOT PREQs rate is handled by cb task.
1242          */
1243         if (last != NULL && minint != NULL) {
1244                 if (ratecheck(last, minint) == 0)
1245                         return EALREADY; /* XXX: we should postpone */
1246                 getmicrouptime(last);
1247         }
1248
1249         /*
1250          * mesh preq action frame format
1251          *     [6] da
1252          *     [6] sa
1253          *     [6] addr3 = sa
1254          *     [1] action
1255          *     [1] category
1256          *     [tlv] mesh path request
1257          */
1258         preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
1259         preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
1260             IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
1261             preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
1262         return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
1263 }
1264
1265 static void
1266 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
1267     const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
1268 {
1269 #define IS_PROXY(rt)    (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
1270 #define PROXIED_BY_US(rt)               \
1271     (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
1272         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1273         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1274         struct ieee80211_mesh_route *rt = NULL;
1275         struct ieee80211_mesh_route *rtorig = NULL;
1276         struct ieee80211_mesh_route *rtext = NULL;
1277         struct ieee80211_hwmp_route *hr;
1278         struct ieee80211com *ic = vap->iv_ic;
1279         struct mbuf *m, *next;
1280         uint32_t metric = 0;
1281         const uint8_t *addr;
1282
1283         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1284             "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
1285             prep->prep_targetaddr, ":");
1286
1287         /*
1288          * Acceptance criteria: (If the corresponding PREP was not generated
1289          * by us OR not generated by an external mac that is not proxied by us)
1290          * AND forwarding is disabled, discard this PREP.
1291          */
1292         rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
1293         if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
1294             (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
1295             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
1296                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1297                     "discard PREP, orig(%6D) not proxied or generated by us",
1298                     prep->prep_origaddr, ":");
1299                 return;
1300         }
1301
1302         /* PREP ACCEPTED */
1303
1304         /*
1305          * If accepted shall create or update the active forwarding information
1306          * it maintains for the target mesh STA of the PREP (according to the
1307          * rules defined in 13.10.8.4). If the conditions for creating or
1308          * updating the forwarding information have not been met in those
1309          * rules, no further steps are applied to the PREP.
1310          */
1311         rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
1312         if (rt == NULL) {
1313                 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
1314                 if (rt == NULL) {
1315                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1316                             "unable to add PREP path to %6D",
1317                             prep->prep_targetaddr, ":");
1318                         vap->iv_stats.is_mesh_rtaddfailed++;
1319                         return;
1320                 }
1321                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1322                     "adding target %6D", prep->prep_targetaddr, ":");
1323         }
1324         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1325         /* update path metric */
1326         metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
1327         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1328                 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
1329                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1330                             "discard PREP from %6D, old seq no %u < %u",
1331                             prep->prep_targetaddr, ":",
1332                             prep->prep_targetseq, hr->hr_seq);
1333                         return;
1334                 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
1335                     metric > rt->rt_metric) {
1336                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1337                             "discard PREP from %6D, new metric %u > %u",
1338                             prep->prep_targetaddr, ":",
1339                             metric, rt->rt_metric);
1340                         return;
1341                 }
1342         }
1343
1344         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1345             "%s path to %6D, hopcount %d:%d metric %d:%d",
1346             rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1347             "prefer" : "update",
1348             prep->prep_targetaddr, ":",
1349             rt->rt_nhops, prep->prep_hopcount + 1,
1350             rt->rt_metric, metric);
1351
1352         hr->hr_seq = prep->prep_targetseq;
1353         hr->hr_preqretries = 0;
1354         IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
1355         rt->rt_metric = metric;
1356         rt->rt_nhops = prep->prep_hopcount + 1;
1357         ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
1358         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1359                 /* discovery complete */
1360                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
1361         }
1362         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
1363
1364         /* Update forwarding information to TA if metric improves */
1365         hwmp_update_transmitter(vap, ni, "PREP");
1366
1367         /*
1368          * If it's NOT for us, propagate the PREP
1369          */
1370         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1371             prep->prep_ttl > 1 &&
1372             prep->prep_hopcount < hs->hs_maxhops) {
1373                 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1374                 /*
1375                  * NB: We should already have setup the path to orig
1376                  * mesh STA when we propagated PREQ to target mesh STA,
1377                  * no PREP is generated without a corresponding PREQ.
1378                  * XXX: for now just ignore.
1379                  */
1380                 if (rtorig == NULL) {
1381                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1382                             "received PREP for an unknown orig(%6D)",
1383                             prep->prep_origaddr, ":");
1384                         return;
1385                 }
1386
1387                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1388                     "propagate PREP from %6D",
1389                     prep->prep_targetaddr, ":");
1390
1391                 memcpy(&pprep, prep, sizeof(pprep));
1392                 pprep.prep_hopcount += 1;
1393                 pprep.prep_ttl -= 1;
1394                 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1395                 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
1396
1397                 /* precursor list for the Target Mesh STA Address is updated */
1398         }
1399
1400         /*
1401          * Check if we received a PREP w/ AE and store target external address.
1402          * We may store target external address if recevied PREP w/ AE
1403          * and we are not final destination
1404          */
1405         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
1406                 rtext = ieee80211_mesh_rt_find(vap,
1407                         prep->prep_target_ext_addr);
1408                 if (rtext == NULL) {
1409                         rtext = ieee80211_mesh_rt_add(vap,
1410                                 prep->prep_target_ext_addr);
1411                         if (rtext == NULL) {
1412                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1413                                     "unable to add PREP path to proxy %6D",
1414                                     prep->prep_targetaddr, ":");
1415                                 vap->iv_stats.is_mesh_rtaddfailed++;
1416                                 return;
1417                         }
1418                 }
1419                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1420                     "%s path to %6D, hopcount %d:%d metric %d:%d",
1421                     rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1422                     "prefer" : "update",
1423                     prep->prep_target_ext_addr, ":",
1424                     rtext->rt_nhops, prep->prep_hopcount + 1,
1425                     rtext->rt_metric, metric);
1426
1427                 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
1428                         IEEE80211_MESHRT_FLAGS_VALID;
1429                 IEEE80211_ADDR_COPY(rtext->rt_dest,
1430                     prep->prep_target_ext_addr);
1431                 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
1432                     prep->prep_targetaddr);
1433                 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
1434                 rtext->rt_metric = metric;
1435                 rtext->rt_lifetime = prep->prep_lifetime;
1436                 rtext->rt_nhops = prep->prep_hopcount + 1;
1437                 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
1438                 /*
1439                  * XXX: proxy entries have no HWMP priv data,
1440                  * nullify them to be sure?
1441                  */
1442         }
1443         /*
1444          * Check for frames queued awaiting path discovery.
1445          * XXX probably can tell exactly and avoid remove call
1446          * NB: hash may have false matches, if so they will get
1447          *     stuck back on the stageq because there won't be
1448          *     a path.
1449          */
1450         addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1451             prep->prep_target_ext_addr : prep->prep_targetaddr;
1452         m = ieee80211_ageq_remove(&ic->ic_stageq,
1453             (struct ieee80211_node *)(uintptr_t)
1454             ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
1455
1456         /*
1457          * All frames in the stageq here should be non-M_ENCAP; or things
1458          * will get very unhappy.
1459          */
1460         for (; m != NULL; m = next) {
1461                 next = m->m_nextpkt;
1462                 m->m_nextpkt = NULL;
1463                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1464                     "flush queued frame %p len %d", m, m->m_pkthdr.len);
1465                 /*
1466                  * If the mbuf has M_ENCAP set, ensure we free it.
1467                  * Note that after if_transmit() is called, m is invalid.
1468                  */
1469                 (void) ieee80211_vap_xmitpkt(vap, m);
1470         }
1471 #undef  IS_PROXY
1472 #undef  PROXIED_BY_US
1473 }
1474
1475 static int
1476 hwmp_send_prep(struct ieee80211vap *vap,
1477     const uint8_t da[IEEE80211_ADDR_LEN],
1478     struct ieee80211_meshprep_ie *prep)
1479 {
1480         /* NB: there's no PREP minimum interval. */
1481
1482         /*
1483          * mesh prep action frame format
1484          *     [6] da
1485          *     [6] sa
1486          *     [6] addr3 = sa
1487          *     [1] action
1488          *     [1] category
1489          *     [tlv] mesh path reply
1490          */
1491         prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1492         prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1493             IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
1494         return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
1495 }
1496
1497 #define PERR_DFLAGS(n)  perr.perr_dests[n].dest_flags
1498 #define PERR_DADDR(n)   perr.perr_dests[n].dest_addr
1499 #define PERR_DSEQ(n)    perr.perr_dests[n].dest_seq
1500 #define PERR_DRCODE(n)  perr.perr_dests[n].dest_rcode
1501 static void
1502 hwmp_peerdown(struct ieee80211_node *ni)
1503 {
1504         struct ieee80211vap *vap = ni->ni_vap;
1505         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1506         struct ieee80211_meshperr_ie perr;
1507         struct ieee80211_mesh_route *rt;
1508         struct ieee80211_hwmp_route *hr;
1509
1510         rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1511         if (rt == NULL)
1512                 return;
1513         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1514         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1515             "%s", "delete route entry");
1516         perr.perr_ttl = ms->ms_ttl;
1517         perr.perr_ndests = 1;
1518         PERR_DFLAGS(0) = 0;
1519         if (hr->hr_seq == 0)
1520                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1521         PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1522         IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1523         PERR_DSEQ(0) = ++hr->hr_seq;
1524         PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1525         /* NB: flush everything passing through peer */
1526         ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1527         hwmp_send_perr(vap, broadcastaddr, &perr);
1528 }
1529 #undef  PERR_DFLAGS
1530 #undef  PERR_DADDR
1531 #undef  PERR_DSEQ
1532 #undef  PERR_DRCODE
1533
1534 #define PERR_DFLAGS(n)          perr->perr_dests[n].dest_flags
1535 #define PERR_DADDR(n)           perr->perr_dests[n].dest_addr
1536 #define PERR_DSEQ(n)            perr->perr_dests[n].dest_seq
1537 #define PERR_DEXTADDR(n)        perr->perr_dests[n].dest_ext_addr
1538 static void
1539 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1540     const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1541 {
1542         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1543         struct ieee80211_mesh_route *rt = NULL;
1544         struct ieee80211_mesh_route *rt_ext = NULL;
1545         struct ieee80211_hwmp_route *hr;
1546         struct ieee80211_meshperr_ie *pperr = NULL;
1547         int i, j = 0, forward = 0;
1548
1549         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1550             "received PERR from %6D", wh->i_addr2, ":");
1551
1552         /*
1553          * if forwarding is true, prepare pperr
1554          */
1555         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1556                 forward = 1;
1557                 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1558                     M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
1559         }
1560
1561         /*
1562          * Acceptance criteria: check if we have forwarding information
1563          * stored about destination, and that nexthop == TA of this PERR.
1564          * NB: we also build a new PERR to propagate in case we should forward.
1565          */
1566         for (i = 0; i < perr->perr_ndests; i++) {
1567                 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1568                 if (rt == NULL)
1569                         continue;
1570                 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
1571                         continue;
1572
1573                 /* found and accepted a PERR ndest element, process it... */
1574                 if (forward)
1575                         memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
1576                             sizeof(*perr->perr_dests));
1577                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1578                 switch(PERR_DFLAGS(i)) {
1579                 case (IEEE80211_REASON_MESH_PERR_NO_FI):
1580                         if (PERR_DSEQ(i) == 0) {
1581                                 hr->hr_seq++;
1582                                 if (forward) {
1583                                         pperr->perr_dests[j].dest_seq =
1584                                             hr->hr_seq;
1585                                 }
1586                         } else {
1587                                 hr->hr_seq = PERR_DSEQ(i);
1588                         }
1589                         rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1590                         j++;
1591                         break;
1592                 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
1593                         if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
1594                                 hr->hr_seq = PERR_DSEQ(i);
1595                                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1596                                 j++;
1597                         }
1598                         break;
1599                 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
1600                         rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
1601                         if (rt_ext != NULL) {
1602                                 rt_ext->rt_flags &=
1603                                     ~IEEE80211_MESHRT_FLAGS_VALID;
1604                                 j++;
1605                         }
1606                         break;
1607                 default:
1608                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1609                             "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
1610                         goto done; /* XXX: stats?? */
1611                 }
1612                 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
1613                 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
1614         }
1615         if (j == 0) {
1616                 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
1617                     "PERR not accepted");
1618                 goto done; /* XXX: stats?? */
1619         }
1620
1621         /*
1622          * Propagate the PERR if we previously found it on our routing table.
1623          */
1624         if (forward && perr->perr_ttl > 1) {
1625                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1626                     "propagate PERR from %6D", wh->i_addr2, ":");
1627                 pperr->perr_ndests = j;
1628                 pperr->perr_ttl--;
1629                 hwmp_send_perr(vap, broadcastaddr, pperr);
1630         }
1631 done:
1632         if (pperr != NULL)
1633                 IEEE80211_FREE(pperr, M_80211_MESH_PERR);
1634 }
1635 #undef  PERR_DFLAGS
1636 #undef  PERR_DADDR
1637 #undef  PERR_DSEQ
1638 #undef  PERR_DEXTADDR
1639
1640 static int
1641 hwmp_send_perr(struct ieee80211vap *vap,
1642     const uint8_t da[IEEE80211_ADDR_LEN],
1643     struct ieee80211_meshperr_ie *perr)
1644 {
1645         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1646         int i;
1647         uint8_t length = 0;
1648
1649         /*
1650          * Enforce PERR interval.
1651          */
1652         if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1653                 return EALREADY;
1654         getmicrouptime(&hs->hs_lastperr);
1655
1656         /*
1657          * mesh perr action frame format
1658          *     [6] da
1659          *     [6] sa
1660          *     [6] addr3 = sa
1661          *     [1] action
1662          *     [1] category
1663          *     [tlv] mesh path error
1664          */
1665         perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1666         length = IEEE80211_MESHPERR_BASE_SZ;
1667         for (i = 0; i<perr->perr_ndests; i++) {
1668                 if (perr->perr_dests[i].dest_flags &
1669                     IEEE80211_MESHPERR_FLAGS_AE) {
1670                         length += IEEE80211_MESHPERR_DEST_SZ_AE;
1671                         continue ;
1672                 }
1673                 length += IEEE80211_MESHPERR_DEST_SZ;
1674         }
1675         perr->perr_len =length;
1676         return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
1677 }
1678
1679 /*
1680  * Called from the rest of the net80211 code (mesh code for example).
1681  * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
1682  * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
1683  */
1684 #define PERR_DFLAGS(n)          perr.perr_dests[n].dest_flags
1685 #define PERR_DADDR(n)           perr.perr_dests[n].dest_addr
1686 #define PERR_DSEQ(n)            perr.perr_dests[n].dest_seq
1687 #define PERR_DEXTADDR(n)        perr.perr_dests[n].dest_ext_addr
1688 #define PERR_DRCODE(n)          perr.perr_dests[n].dest_rcode
1689 static void
1690 hwmp_senderror(struct ieee80211vap *vap,
1691     const uint8_t addr[IEEE80211_ADDR_LEN],
1692     struct ieee80211_mesh_route *rt, int rcode)
1693 {
1694         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1695         struct ieee80211_hwmp_route *hr = NULL;
1696         struct ieee80211_meshperr_ie perr;
1697
1698         if (rt != NULL)
1699                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1700                     struct ieee80211_hwmp_route);
1701
1702         perr.perr_ndests = 1;
1703         perr.perr_ttl = ms->ms_ttl;
1704         PERR_DFLAGS(0) = 0;
1705         PERR_DRCODE(0) = rcode;
1706
1707         switch (rcode) {
1708         case IEEE80211_REASON_MESH_PERR_NO_FI:
1709                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1710                 PERR_DSEQ(0) = 0; /* reserved */
1711                 break;
1712         case IEEE80211_REASON_MESH_PERR_NO_PROXY:
1713                 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
1714                 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
1715                     ("route is not marked proxy"));
1716                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
1717                 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
1718                 PERR_DSEQ(0) = rt->rt_ext_seq;
1719                 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
1720                 break;
1721         case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
1722                 KASSERT(rt != NULL, ("no route info for sending PERR"));
1723                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1724                 PERR_DSEQ(0) = hr->hr_seq;
1725                 break;
1726         default:
1727                 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
1728         }
1729         hwmp_send_perr(vap, broadcastaddr, &perr);
1730 }
1731 #undef  PERR_DFLAGS
1732 #undef  PEER_DADDR
1733 #undef  PERR_DSEQ
1734 #undef  PERR_DEXTADDR
1735 #undef  PERR_DRCODE
1736
1737 static void
1738 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1739     const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1740 {
1741         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1742         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1743         struct ieee80211_mesh_route *rt = NULL;
1744         struct ieee80211_hwmp_route *hr;
1745         struct ieee80211_meshpreq_ie preq;
1746         struct ieee80211_meshrann_ie prann;
1747
1748         if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1749                 return;
1750
1751         rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1752         if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
1753                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1754
1755                 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
1756                 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
1757                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1758                         "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
1759                         return;
1760                 }
1761
1762                 /* Acceptance criteria: if RANN.seq == stored seq AND
1763                 * RANN.metric > stored metric, discard RANN */
1764                 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
1765                 rann->rann_metric > rt->rt_metric) {
1766                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1767                         "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
1768                         return;
1769                 }
1770         }
1771
1772         /* RANN ACCEPTED */
1773
1774         ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
1775
1776         if (rt == NULL) {
1777                 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
1778                 if (rt == NULL) {
1779                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1780                             "unable to add mac for RANN root %6D",
1781                             rann->rann_addr, ":");
1782                             vap->iv_stats.is_mesh_rtaddfailed++;
1783                         return;
1784                 }
1785         }
1786         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1787         /* Check if root is a mesh gate, mark it */
1788         if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
1789                 struct ieee80211_mesh_gate_route *gr;
1790
1791                 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1792                 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
1793                         rt);
1794                 gr->gr_lastseq = 0; /* NOT GANN */
1795         }
1796         /* discovery timeout */
1797         ieee80211_mesh_rt_update(rt,
1798             ticks_to_msecs(ieee80211_hwmp_roottimeout));
1799
1800         preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
1801         preq.preq_hopcount = 0;
1802         preq.preq_ttl = ms->ms_ttl;
1803         preq.preq_id = 0; /* reserved */
1804         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1805         preq.preq_origseq = ++hs->hs_seq;
1806         preq.preq_lifetime = ieee80211_hwmp_roottimeout;
1807         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1808         preq.preq_tcount = 1;
1809         preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
1810         /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
1811         IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
1812         preq.preq_targets[0].target_seq = rann->rann_seq;
1813         /* XXX: if rootconfint have not passed, we built this preq in vain */
1814         hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
1815             &ieee80211_hwmp_rootconfint);
1816
1817         /* propagate a RANN */
1818         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1819             rann->rann_ttl > 1 &&
1820             ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1821                 hr->hr_seq = rann->rann_seq;
1822                 memcpy(&prann, rann, sizeof(prann));
1823                 prann.rann_hopcount += 1;
1824                 prann.rann_ttl -= 1;
1825                 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1826                 hwmp_send_rann(vap, broadcastaddr, &prann);
1827         }
1828 }
1829
1830 static int
1831 hwmp_send_rann(struct ieee80211vap *vap,
1832     const uint8_t da[IEEE80211_ADDR_LEN],
1833     struct ieee80211_meshrann_ie *rann)
1834 {
1835         /*
1836          * mesh rann action frame format
1837          *     [6] da
1838          *     [6] sa
1839          *     [6] addr3 = sa
1840          *     [1] action
1841          *     [1] category
1842          *     [tlv] root announcement
1843          */
1844         rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1845         rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
1846         return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
1847 }
1848
1849 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
1850 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
1851 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
1852 static void
1853 hwmp_rediscover_cb(void *arg)
1854 {
1855         struct ieee80211_mesh_route *rt = arg;
1856         struct ieee80211vap *vap = rt->rt_vap;
1857         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1858         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1859         struct ieee80211_hwmp_route *hr;
1860         struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
1861
1862         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
1863                 return ; /* nothing to do */
1864
1865         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1866         if (hr->hr_preqretries >=
1867                 ieee80211_hwmp_maxpreq_retries) {
1868                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
1869                         rt->rt_dest, "%s",
1870                         "max number of discovery, send queued frames to GATE");
1871                 ieee80211_mesh_forward_to_gates(vap, rt);
1872                 vap->iv_stats.is_mesh_fwd_nopath++;
1873                 return ; /* XXX: flush queue? */
1874         }
1875
1876         hr->hr_preqretries++;
1877
1878         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
1879             "start path rediscovery , target seq %u", hr->hr_seq);
1880         /*
1881          * Try to discover the path for this node.
1882          * Group addressed PREQ Case A
1883          */
1884         preq.preq_flags = 0;
1885         preq.preq_hopcount = 0;
1886         preq.preq_ttl = ms->ms_ttl;
1887         preq.preq_id = ++hs->hs_preqid;
1888         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1889         preq.preq_origseq = hr->hr_origseq;
1890         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1891         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1892         preq.preq_tcount = 1;
1893         IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
1894         PREQ_TFLAGS(0) = 0;
1895         if (ieee80211_hwmp_targetonly)
1896                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1897         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1898         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1899         /* XXX check return value */
1900         hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
1901             &ieee80211_hwmp_preqminint);
1902         callout_reset(&rt->rt_discovery,
1903                 ieee80211_hwmp_net_diameter_traversaltime * 2,
1904                 hwmp_rediscover_cb, rt);
1905 }
1906
1907 static struct ieee80211_node *
1908 hwmp_discover(struct ieee80211vap *vap,
1909     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1910 {
1911         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1912         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1913         struct ieee80211_mesh_route *rt = NULL;
1914         struct ieee80211_hwmp_route *hr;
1915         struct ieee80211_meshpreq_ie preq;
1916         struct ieee80211_node *ni;
1917         int sendpreq = 0;
1918
1919         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1920             ("not a mesh vap, opmode %d", vap->iv_opmode));
1921
1922         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1923             ("%s: discovering self!", __func__));
1924
1925         ni = NULL;
1926         if (!IEEE80211_IS_MULTICAST(dest)) {
1927                 rt = ieee80211_mesh_rt_find(vap, dest);
1928                 if (rt == NULL) {
1929                         rt = ieee80211_mesh_rt_add(vap, dest);
1930                         if (rt == NULL) {
1931                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1932                                     ni, "unable to add discovery path to %6D",
1933                                     dest, ":");
1934                                 vap->iv_stats.is_mesh_rtaddfailed++;
1935                                 goto done;
1936                         }
1937                 }
1938                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1939                     struct ieee80211_hwmp_route);
1940                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1941                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1942                             "%s", "already discovering queue frame until path found");
1943                         sendpreq = 1;
1944                         goto done;
1945                 }
1946                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1947                         if (hr->hr_lastdiscovery != 0 &&
1948                             (ticks - hr->hr_lastdiscovery <
1949                             (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
1950                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1951                                     dest, NULL, "%s",
1952                                     "too frequent discovery requeust");
1953                                 sendpreq = 1;
1954                                 goto done;
1955                         }
1956                         hr->hr_lastdiscovery = ticks;
1957                         if (hr->hr_preqretries >=
1958                             ieee80211_hwmp_maxpreq_retries) {
1959                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1960                                     dest, NULL, "%s",
1961                                     "no valid path , max number of discovery");
1962                                 vap->iv_stats.is_mesh_fwd_nopath++;
1963                                 goto done;
1964                         }
1965                         rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
1966                         hr->hr_preqretries++;
1967                         if (hr->hr_origseq == 0)
1968                                 hr->hr_origseq = ++hs->hs_seq;
1969                         rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1970                         sendpreq = 1;
1971                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1972                             "start path discovery (src %s), target seq %u",
1973                             m == NULL ? "<none>" : ether_sprintf(
1974                             mtod(m, struct ether_header *)->ether_shost),
1975                             hr->hr_seq);
1976                         /*
1977                          * Try to discover the path for this node.
1978                          * Group addressed PREQ Case A
1979                          */
1980                         preq.preq_flags = 0;
1981                         preq.preq_hopcount = 0;
1982                         preq.preq_ttl = ms->ms_ttl;
1983                         preq.preq_id = ++hs->hs_preqid;
1984                         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1985                         preq.preq_origseq = hr->hr_origseq;
1986                         preq.preq_lifetime =
1987                             ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1988                         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1989                         preq.preq_tcount = 1;
1990                         IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1991                         PREQ_TFLAGS(0) = 0;
1992                         if (ieee80211_hwmp_targetonly)
1993                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1994                         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1995                         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1996                         /* XXX check return value */
1997                         hwmp_send_preq(vap, broadcastaddr, &preq,
1998                             &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
1999                         callout_reset(&rt->rt_discovery,
2000                             ieee80211_hwmp_net_diameter_traversaltime * 2,
2001                             hwmp_rediscover_cb, rt);
2002                 }
2003                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
2004                         ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
2005         } else {
2006                 ni = ieee80211_find_txnode(vap, dest);
2007                 /* NB: if null then we leak mbuf */
2008                 KASSERT(ni != NULL, ("leak mcast frame"));
2009                 return ni;
2010         }
2011 done:
2012         if (ni == NULL && m != NULL) {
2013                 if (sendpreq) {
2014                         struct ieee80211com *ic = vap->iv_ic;
2015                         /*
2016                          * Queue packet for transmit when path discovery
2017                          * completes.  If discovery never completes the
2018                          * frame will be flushed by way of the aging timer.
2019                          */
2020                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2021                             "%s", "queue frame until path found");
2022                         MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
2023                         m->m_pkthdr.rcvif = (void *)(uintptr_t)
2024                             ieee80211_mac_hash(ic, dest);
2025                         /* XXX age chosen randomly */
2026                         ieee80211_ageq_append(&ic->ic_stageq, m,
2027                             IEEE80211_INACT_WAIT);
2028                 } else {
2029                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
2030                             dest, NULL, "%s", "no valid path to this node");
2031                         m_freem(m);
2032                 }
2033         }
2034         return ni;
2035 }
2036 #undef  PREQ_TFLAGS
2037 #undef  PREQ_TADDR
2038 #undef  PREQ_TSEQ
2039
2040 static int
2041 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2042 {
2043         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2044         int error;
2045
2046         if (vap->iv_opmode != IEEE80211_M_MBSS)
2047                 return ENOSYS;
2048         error = 0;
2049         switch (ireq->i_type) {
2050         case IEEE80211_IOC_HWMP_ROOTMODE:
2051                 ireq->i_val = hs->hs_rootmode;
2052                 break;
2053         case IEEE80211_IOC_HWMP_MAXHOPS:
2054                 ireq->i_val = hs->hs_maxhops;
2055                 break;
2056         default:
2057                 return ENOSYS;
2058         }
2059         return error;
2060 }
2061 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
2062
2063 static int
2064 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2065 {
2066         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2067         int error;
2068
2069         if (vap->iv_opmode != IEEE80211_M_MBSS)
2070                 return ENOSYS;
2071         error = 0;
2072         switch (ireq->i_type) {
2073         case IEEE80211_IOC_HWMP_ROOTMODE:
2074                 if (ireq->i_val < 0 || ireq->i_val > 3)
2075                         return EINVAL;
2076                 hs->hs_rootmode = ireq->i_val;
2077                 hwmp_rootmode_setup(vap);
2078                 break;
2079         case IEEE80211_IOC_HWMP_MAXHOPS:
2080                 if (ireq->i_val <= 0 || ireq->i_val > 255)
2081                         return EINVAL;
2082                 hs->hs_maxhops = ireq->i_val;
2083                 break;
2084         default:
2085                 return ENOSYS;
2086         }
2087         return error;
2088 }
2089 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);