sys/net80211/ieee80211_hwmp.c

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