sys/net80211/ieee80211_hwmp.c

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