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 ieee80211_node *,
  72                     const uint8_t [IEEE80211_ADDR_LEN],
  73                     const uint8_t [IEEE80211_ADDR_LEN],
  74                     uint8_t *, size_t);
  75 static uint8_t * hwmp_add_meshpreq(uint8_t *,
  76                     const struct ieee80211_meshpreq_ie *);
  77 static uint8_t * hwmp_add_meshprep(uint8_t *,
  78                     const struct ieee80211_meshprep_ie *);
  79 static uint8_t * hwmp_add_meshperr(uint8_t *,
  80                     const struct ieee80211_meshperr_ie *);
  81 static uint8_t * hwmp_add_meshrann(uint8_t *,
  82                     const struct ieee80211_meshrann_ie *);
  83 static void     hwmp_rootmode_setup(struct ieee80211vap *);
  84 static void     hwmp_rootmode_cb(void *);
  85 static void     hwmp_rootmode_rann_cb(void *);
  86 static void     hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
  87                     const struct ieee80211_frame *,
  88                     const struct ieee80211_meshpreq_ie *);
  89 static int      hwmp_send_preq(struct ieee80211_node *,
  90                     const uint8_t [IEEE80211_ADDR_LEN],
  91                     const uint8_t [IEEE80211_ADDR_LEN],
  92                     struct ieee80211_meshpreq_ie *);
  93 static void     hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
  94                     const struct ieee80211_frame *,
  95                     const struct ieee80211_meshprep_ie *);
  96 static int      hwmp_send_prep(struct ieee80211_node *,
  97                     const uint8_t [IEEE80211_ADDR_LEN],
  98                     const uint8_t [IEEE80211_ADDR_LEN],
  99                     struct ieee80211_meshprep_ie *);
 100 static void     hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
 101                     const struct ieee80211_frame *,
 102                     const struct ieee80211_meshperr_ie *);
 103 static int      hwmp_send_perr(struct ieee80211_node *,
 104                     const uint8_t [IEEE80211_ADDR_LEN],
 105                     const uint8_t [IEEE80211_ADDR_LEN],
 106                     struct ieee80211_meshperr_ie *);
 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 ieee80211_node *,
 111                     const uint8_t [IEEE80211_ADDR_LEN],
 112                     const uint8_t [IEEE80211_ADDR_LEN],
 113                     struct ieee80211_meshrann_ie *);
 114 static struct ieee80211_node *
 115                 hwmp_discover(struct ieee80211vap *,
 116                     const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
 117 static void     hwmp_peerdown(struct ieee80211_node *);
 118
 119 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
 120 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
 121
 122 /* unalligned little endian access */
 123 #define LE_WRITE_2(p, v) do {                           \
 124         ((uint8_t *)(p))[0] = (v) & 0xff;               \
 125         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
 126 } while (0)
 127 #define LE_WRITE_4(p, v) do {                           \
 128         ((uint8_t *)(p))[0] = (v) & 0xff;               \
 129         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
 130         ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff;       \
 131         ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff;       \
 132 } while (0)
 133
 134
 135 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
 136 static const uint8_t    broadcastaddr[IEEE80211_ADDR_LEN] =
 137         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 138
 139 typedef uint32_t ieee80211_hwmp_seq;
 140 #define HWMP_SEQ_LT(a, b)       ((int32_t)((a)-(b)) < 0)
 141 #define HWMP_SEQ_LEQ(a, b)      ((int32_t)((a)-(b)) <= 0)
 142 #define HWMP_SEQ_GT(a, b)       ((int32_t)((a)-(b)) > 0)
 143 #define HWMP_SEQ_GEQ(a, b)      ((int32_t)((a)-(b)) >= 0)
 144
 145 /*
 146  * Private extension of ieee80211_mesh_route.
 147  */
 148 struct ieee80211_hwmp_route {
 149         ieee80211_hwmp_seq      hr_seq;         /* last HWMP seq seen from dst*/
 150         ieee80211_hwmp_seq      hr_preqid;      /* last PREQ ID seen from dst */
 151         ieee80211_hwmp_seq      hr_origseq;     /* seq. no. on our latest PREQ*/
 152         int                     hr_preqretries;
 153 };
 154 struct ieee80211_hwmp_state {
 155         ieee80211_hwmp_seq      hs_seq;         /* next seq to be used */
 156         ieee80211_hwmp_seq      hs_preqid;      /* next PREQ ID to be used */
 157         struct timeval          hs_lastpreq;    /* last time we sent a PREQ */
 158         struct timeval          hs_lastperr;    /* last time we sent a PERR */
 159         int                     hs_rootmode;    /* proactive HWMP */
 160         struct callout          hs_roottimer;
 161         uint8_t                 hs_maxhops;     /* max hop count */
 162 };
 163
 164 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
 165     "IEEE 802.11s HWMP parameters");
 166 static int      ieee80211_hwmp_targetonly = 0;
 167 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW,
 168     &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
 169 static int      ieee80211_hwmp_replyforward = 1;
 170 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW,
 171     &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs");
 172 static int      ieee80211_hwmp_pathtimeout = -1;
 173 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
 174     &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 175     "path entry lifetime (ms)");
 176 static int      ieee80211_hwmp_roottimeout = -1;
 177 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
 178     &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 179     "root PREQ timeout (ms)");
 180 static int      ieee80211_hwmp_rootint = -1;
 181 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
 182     &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
 183     "root interval (ms)");
 184 static int      ieee80211_hwmp_rannint = -1;
 185 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
 186     &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
 187     "root announcement interval (ms)");
 188
 189 #define IEEE80211_HWMP_DEFAULT_MAXHOPS  31
 190
 191 static  ieee80211_recv_action_func hwmp_recv_action_meshpath;
 192
 193 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
 194         .mpp_descr      = "HWMP",
 195         .mpp_ie         = IEEE80211_MESHCONF_PATH_HWMP,
 196         .mpp_discover   = hwmp_discover,
 197         .mpp_peerdown   = hwmp_peerdown,
 198         .mpp_vattach    = hwmp_vattach,
 199         .mpp_vdetach    = hwmp_vdetach,
 200         .mpp_newstate   = hwmp_newstate,
 201         .mpp_privlen    = sizeof(struct ieee80211_hwmp_route),
 202 };
 203 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
 204         &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
 205         "mesh route inactivity timeout (ms)");
 206
 207
 208 static void
 209 ieee80211_hwmp_init(void)
 210 {
 211         ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
 212         ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
 213         ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
 214         ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
 215
 216         /*
 217          * Register action frame handler.
 218          */
 219         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH,
 220             IEEE80211_ACTION_MESHPATH_SEL, hwmp_recv_action_meshpath);
 221
 222         /* NB: default is 5 secs per spec */
 223         mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
 224
 225         /*
 226          * Register HWMP.
 227          */
 228         ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
 229 }
 230 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
 231
 232 void
 233 hwmp_vattach(struct ieee80211vap *vap)
 234 {
 235         struct ieee80211_hwmp_state *hs;
 236
 237         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
 238             ("not a mesh vap, opmode %d", vap->iv_opmode));
 239
 240         hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
 241             M_NOWAIT | M_ZERO);
 242         if (hs == NULL) {
 243                 printf("%s: couldn't alloc HWMP state\n", __func__);
 244                 return;
 245         }
 246         hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
 247         callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE);
 248         vap->iv_hwmp = hs;
 249 }
 250
 251 void
 252 hwmp_vdetach(struct ieee80211vap *vap)
 253 {
 254         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 255
 256         callout_drain(&hs->hs_roottimer);
 257         free(vap->iv_hwmp, M_80211_VAP);
 258         vap->iv_hwmp = NULL;
 259 }
 260
 261 int
 262 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
 263 {
 264         enum ieee80211_state nstate = vap->iv_state;
 265         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 266
 267         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 268             __func__, ieee80211_state_name[ostate],
 269             ieee80211_state_name[nstate], arg);
 270
 271         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
 272                 callout_drain(&hs->hs_roottimer);
 273         if (nstate == IEEE80211_S_RUN)
 274                 hwmp_rootmode_setup(vap);
 275         return 0;
 276 }
 277
 278 static int
 279 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
 280         const struct ieee80211_frame *wh,
 281         const uint8_t *frm, const uint8_t *efrm)
 282 {
 283         struct ieee80211vap *vap = ni->ni_vap;
 284         struct ieee80211_meshpreq_ie preq;
 285         struct ieee80211_meshprep_ie prep;
 286         struct ieee80211_meshperr_ie perr;
 287         struct ieee80211_meshrann_ie rann;
 288         const uint8_t *iefrm = frm + 2; /* action + code */
 289         int found = 0;
 290
 291         while (efrm - iefrm > 1) {
 292                 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
 293                 switch (*iefrm) {
 294                 case IEEE80211_ELEMID_MESHPREQ:
 295                 {
 296                         const struct ieee80211_meshpreq_ie *mpreq =
 297                             (const struct ieee80211_meshpreq_ie *) iefrm;
 298                         /* XXX > 1 target */
 299                         if (mpreq->preq_len !=
 300                             sizeof(struct ieee80211_meshpreq_ie) - 2) {
 301                                 IEEE80211_DISCARD(vap,
 302                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 303                                     wh, NULL, "%s", "PREQ with wrong len");
 304                                 vap->iv_stats.is_rx_mgtdiscard++;
 305                                 break;
 306                         }
 307                         memcpy(&preq, mpreq, sizeof(preq));
 308                         preq.preq_id = LE_READ_4(&mpreq->preq_id);
 309                         preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq);
 310                         preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime);
 311                         preq.preq_metric = LE_READ_4(&mpreq->preq_metric);
 312                         preq.preq_targets[0].target_seq =
 313                             LE_READ_4(&mpreq->preq_targets[0].target_seq);
 314                         hwmp_recv_preq(vap, ni, wh, &preq);
 315                         found++;
 316                         break;
 317                 }
 318                 case IEEE80211_ELEMID_MESHPREP:
 319                 {
 320                         const struct ieee80211_meshprep_ie *mprep =
 321                             (const struct ieee80211_meshprep_ie *) iefrm;
 322                         if (mprep->prep_len !=
 323                             sizeof(struct ieee80211_meshprep_ie) - 2) {
 324                                 IEEE80211_DISCARD(vap,
 325                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 326                                     wh, NULL, "%s", "PREP with wrong len");
 327                                 vap->iv_stats.is_rx_mgtdiscard++;
 328                                 break;
 329                         }
 330                         memcpy(&prep, mprep, sizeof(prep));
 331                         prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq);
 332                         prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime);
 333                         prep.prep_metric = LE_READ_4(&mprep->prep_metric);
 334                         prep.prep_origseq = LE_READ_4(&mprep->prep_origseq);
 335                         hwmp_recv_prep(vap, ni, wh, &prep);
 336                         found++;
 337                         break;
 338                 }
 339                 case IEEE80211_ELEMID_MESHPERR:
 340                 {
 341                         const struct ieee80211_meshperr_ie *mperr =
 342                             (const struct ieee80211_meshperr_ie *) iefrm;
 343                         /* XXX > 1 target */
 344                         if (mperr->perr_len !=
 345                             sizeof(struct ieee80211_meshperr_ie) - 2) {
 346                                 IEEE80211_DISCARD(vap,
 347                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 348                                     wh, NULL, "%s", "PERR with wrong len");
 349                                 vap->iv_stats.is_rx_mgtdiscard++;
 350                                 break;
 351                         }
 352                         memcpy(&perr, mperr, sizeof(perr));
 353                         perr.perr_dests[0].dest_seq =
 354                             LE_READ_4(&mperr->perr_dests[0].dest_seq);
 355                         hwmp_recv_perr(vap, ni, wh, &perr);
 356                         found++;
 357                         break;
 358                 }
 359                 case IEEE80211_ELEMID_MESHRANN:
 360                 {
 361                         const struct ieee80211_meshrann_ie *mrann =
 362                             (const struct ieee80211_meshrann_ie *) iefrm;
 363                         if (mrann->rann_len !=
 364                             sizeof(struct ieee80211_meshrann_ie) - 2) {
 365                                 IEEE80211_DISCARD(vap,
 366                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 367                                     wh, NULL, "%s", "RAN with wrong len");
 368                                 vap->iv_stats.is_rx_mgtdiscard++;
 369                                 return 1;
 370                         }
 371                         memcpy(&rann, mrann, sizeof(rann));
 372                         rann.rann_seq = LE_READ_4(&mrann->rann_seq);
 373                         rann.rann_metric = LE_READ_4(&mrann->rann_metric);
 374                         hwmp_recv_rann(vap, ni, wh, &rann);
 375                         found++;
 376                         break;
 377                 }
 378                 }
 379                 iefrm += iefrm[1] + 2;
 380         }
 381         if (!found) {
 382                 IEEE80211_DISCARD(vap,
 383                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 384                     wh, NULL, "%s", "PATH SEL action without IE");
 385                 vap->iv_stats.is_rx_mgtdiscard++;
 386         }
 387         return 0;
 388 }
 389
 390 static int
 391 hwmp_send_action(struct ieee80211_node *ni,
 392     const uint8_t sa[IEEE80211_ADDR_LEN],
 393     const uint8_t da[IEEE80211_ADDR_LEN],
 394     uint8_t *ie, size_t len)
 395 {
 396         struct ieee80211vap *vap = ni->ni_vap;
 397         struct ieee80211com *ic = ni->ni_ic;
 398         struct ieee80211_bpf_params params;
 399         struct mbuf *m;
 400         uint8_t *frm;
 401
 402         if (vap->iv_state == IEEE80211_S_CAC) {
 403                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
 404                     "block %s frame in CAC state", "HWMP action");
 405                 vap->iv_stats.is_tx_badstate++;
 406                 return EIO;     /* XXX */
 407         }
 408
 409         KASSERT(ni != NULL, ("null node"));
 410         /*
 411          * Hold a reference on the node so it doesn't go away until after
 412          * the xmit is complete all the way in the driver.  On error we
 413          * will remove our reference.
 414          */
 415 #ifdef IEEE80211_DEBUG_REFCNT
 416         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 417             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 418             __func__, __LINE__,
 419             ni, ether_sprintf(ni->ni_macaddr),
 420             ieee80211_node_refcnt(ni)+1);
 421 #endif
 422         ieee80211_ref_node(ni);
 423
 424         m = ieee80211_getmgtframe(&frm,
 425             ic->ic_headroom + sizeof(struct ieee80211_frame),
 426             sizeof(struct ieee80211_action) + len
 427         );
 428         if (m == NULL) {
 429                 ieee80211_free_node(ni);
 430                 vap->iv_stats.is_tx_nobuf++;
 431                 return ENOMEM;
 432         }
 433         *frm++ = IEEE80211_ACTION_CAT_MESHPATH;
 434         *frm++ = IEEE80211_ACTION_MESHPATH_SEL;
 435         switch (*ie) {
 436         case IEEE80211_ELEMID_MESHPREQ:
 437                 frm = hwmp_add_meshpreq(frm,
 438                     (struct ieee80211_meshpreq_ie *)ie);
 439                 break;
 440         case IEEE80211_ELEMID_MESHPREP:
 441                 frm = hwmp_add_meshprep(frm,
 442                     (struct ieee80211_meshprep_ie *)ie);
 443                 break;
 444         case IEEE80211_ELEMID_MESHPERR:
 445                 frm = hwmp_add_meshperr(frm,
 446                     (struct ieee80211_meshperr_ie *)ie);
 447                 break;
 448         case IEEE80211_ELEMID_MESHRANN:
 449                 frm = hwmp_add_meshrann(frm,
 450                     (struct ieee80211_meshrann_ie *)ie);
 451                 break;
 452         }
 453
 454         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 455         M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
 456         if (m == NULL) {
 457                 ieee80211_free_node(ni);
 458                 vap->iv_stats.is_tx_nobuf++;
 459                 return ENOMEM;
 460         }
 461         ieee80211_send_setup(ni, m,
 462             IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
 463             IEEE80211_NONQOS_TID, sa, da, sa);
 464
 465         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 466         IEEE80211_NODE_STAT(ni, tx_mgmt);
 467
 468         memset(&params, 0, sizeof(params));
 469         params.ibp_pri = WME_AC_VO;
 470         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 471         if (IEEE80211_IS_MULTICAST(da))
 472                 params.ibp_try0 = 1;
 473         else
 474                 params.ibp_try0 = ni->ni_txparms->maxretry;
 475         params.ibp_power = ni->ni_txpower;
 476         return ic->ic_raw_xmit(ni, m, &params);
 477 }
 478
 479 #define ADDSHORT(frm, v) do {           \
 480         frm[0] = (v) & 0xff;            \
 481         frm[1] = (v) >> 8;              \
 482         frm += 2;                       \
 483 } while (0)
 484 #define ADDWORD(frm, v) do {            \
 485         LE_WRITE_4(frm, v);             \
 486         frm += 4;                       \
 487 } while (0)
 488 /*
 489  * Add a Mesh Path Request IE to a frame.
 490  */
 491 static uint8_t *
 492 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
 493 {
 494         int i;
 495
 496         *frm++ = IEEE80211_ELEMID_MESHPREQ;
 497         *frm++ = sizeof(struct ieee80211_meshpreq_ie) - 2 +
 498             (preq->preq_tcount - 1) * sizeof(*preq->preq_targets);
 499         *frm++ = preq->preq_flags;
 500         *frm++ = preq->preq_hopcount;
 501         *frm++ = preq->preq_ttl;
 502         ADDWORD(frm, preq->preq_id);
 503         IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
 504         ADDWORD(frm, preq->preq_origseq);
 505         ADDWORD(frm, preq->preq_lifetime);
 506         ADDWORD(frm, preq->preq_metric);
 507         *frm++ = preq->preq_tcount;
 508         for (i = 0; i < preq->preq_tcount; i++) {
 509                 *frm++ = preq->preq_targets[i].target_flags;
 510                 IEEE80211_ADDR_COPY(frm, preq->preq_targets[i].target_addr);
 511                 frm += 6;
 512                 ADDWORD(frm, preq->preq_targets[i].target_seq);
 513         }
 514         return frm;
 515 }
 516
 517 /*
 518  * Add a Mesh Path Reply IE to a frame.
 519  */
 520 static uint8_t *
 521 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
 522 {
 523         *frm++ = IEEE80211_ELEMID_MESHPREP;
 524         *frm++ = sizeof(struct ieee80211_meshprep_ie) - 2;
 525         *frm++ = prep->prep_flags;
 526         *frm++ = prep->prep_hopcount;
 527         *frm++ = prep->prep_ttl;
 528         IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
 529         ADDWORD(frm, prep->prep_targetseq);
 530         ADDWORD(frm, prep->prep_lifetime);
 531         ADDWORD(frm, prep->prep_metric);
 532         IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
 533         ADDWORD(frm, prep->prep_origseq);
 534         return frm;
 535 }
 536
 537 /*
 538  * Add a Mesh Path Error IE to a frame.
 539  */
 540 static uint8_t *
 541 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
 542 {
 543         int i;
 544
 545         *frm++ = IEEE80211_ELEMID_MESHPERR;
 546         *frm++ = sizeof(struct ieee80211_meshperr_ie) - 2 +
 547             (perr->perr_ndests - 1) * sizeof(*perr->perr_dests);
 548         *frm++ = perr->perr_ttl;
 549         *frm++ = perr->perr_ndests;
 550         for (i = 0; i < perr->perr_ndests; i++) {
 551                 *frm++ = perr->perr_dests[i].dest_flags;
 552                 IEEE80211_ADDR_COPY(frm, perr->perr_dests[i].dest_addr);
 553                 frm += 6;
 554                 ADDWORD(frm, perr->perr_dests[i].dest_seq);
 555                 ADDSHORT(frm, perr->perr_dests[i].dest_rcode);
 556         }
 557         return frm;
 558 }
 559
 560 /*
 561  * Add a Root Annoucement IE to a frame.
 562  */
 563 static uint8_t *
 564 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
 565 {
 566         *frm++ = IEEE80211_ELEMID_MESHRANN;
 567         *frm++ = sizeof(struct ieee80211_meshrann_ie) - 2;
 568         *frm++ = rann->rann_flags;
 569         *frm++ = rann->rann_hopcount;
 570         *frm++ = rann->rann_ttl;
 571         IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
 572         ADDWORD(frm, rann->rann_seq);
 573         ADDWORD(frm, rann->rann_metric);
 574         return frm;
 575 }
 576
 577 static void
 578 hwmp_rootmode_setup(struct ieee80211vap *vap)
 579 {
 580         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 581
 582         switch (hs->hs_rootmode) {
 583         case IEEE80211_HWMP_ROOTMODE_DISABLED:
 584                 callout_drain(&hs->hs_roottimer);
 585                 break;
 586         case IEEE80211_HWMP_ROOTMODE_NORMAL:
 587         case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
 588                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
 589                     hwmp_rootmode_cb, vap);
 590                 break;
 591         case IEEE80211_HWMP_ROOTMODE_RANN:
 592                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
 593                     hwmp_rootmode_rann_cb, vap);
 594                 break;
 595         }
 596 }
 597
 598 /*
 599  * Send a broadcast Path Request to find all nodes on the mesh. We are
 600  * called when the vap is configured as a HWMP root node.
 601  */
 602 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
 603 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
 604 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
 605 static void
 606 hwmp_rootmode_cb(void *arg)
 607 {
 608         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 609         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 610         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 611         struct ieee80211_meshpreq_ie preq;
 612
 613         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 614             "%s", "send broadcast PREQ");
 615
 616         preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
 617         if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
 618                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR;
 619         if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
 620                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
 621         preq.preq_hopcount = 0;
 622         preq.preq_ttl = ms->ms_ttl;
 623         preq.preq_id = ++hs->hs_preqid;
 624         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 625         preq.preq_origseq = ++hs->hs_seq;
 626         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
 627         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 628         preq.preq_tcount = 1;
 629         IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
 630         PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
 631             IEEE80211_MESHPREQ_TFLAGS_RF;
 632         PREQ_TSEQ(0) = 0;
 633         vap->iv_stats.is_hwmp_rootreqs++;
 634         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq);
 635         hwmp_rootmode_setup(vap);
 636 }
 637 #undef  PREQ_TFLAGS
 638 #undef  PREQ_TADDR
 639 #undef  PREQ_TSEQ
 640
 641 /*
 642  * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
 643  * called when the vap is configured as a HWMP RANN root node.
 644  */
 645 static void
 646 hwmp_rootmode_rann_cb(void *arg)
 647 {
 648         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 649         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 650         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 651         struct ieee80211_meshrann_ie rann;
 652
 653         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 654             "%s", "send broadcast RANN");
 655
 656         rann.rann_flags = 0;
 657         if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
 658                 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR;
 659         rann.rann_hopcount = 0;
 660         rann.rann_ttl = ms->ms_ttl;
 661         IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
 662         rann.rann_seq = ++hs->hs_seq;
 663         rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 664
 665         vap->iv_stats.is_hwmp_rootrann++;
 666         hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann);
 667         hwmp_rootmode_setup(vap);
 668 }
 669
 670 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
 671 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
 672 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
 673 static void
 674 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
 675     const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
 676 {
 677         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 678         struct ieee80211_mesh_route *rt = NULL;
 679         struct ieee80211_mesh_route *rtorig = NULL;
 680         struct ieee80211_hwmp_route *hrorig;
 681         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 682         struct ieee80211_meshprep_ie prep;
 683
 684         if (ni == vap->iv_bss ||
 685             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 686                 return;
 687         /*
 688          * Ignore PREQs from us. Could happen because someone forward it
 689          * back to us.
 690          */
 691         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
 692                 return;
 693
 694         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 695             "received PREQ, source %s", ether_sprintf(preq->preq_origaddr));
 696
 697         /*
 698          * Acceptance criteria: if the PREQ is not for us and
 699          * forwarding is disabled, discard this PREQ.
 700          */
 701         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) &&
 702             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
 703                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 704                     preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
 705                 return;
 706         }
 707         rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
 708         if (rtorig == NULL)
 709                 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
 710         if (rtorig == NULL) {
 711                 /* XXX stat */
 712                 return;
 713         }
 714         hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
 715         /*
 716          * Sequence number validation.
 717          */
 718         if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) &&
 719             HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) {
 720                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 721                     "discard PREQ from %s, old seq no %u <= %u",
 722                     ether_sprintf(preq->preq_origaddr),
 723                     preq->preq_origseq, hrorig->hr_seq);
 724                 return;
 725         }
 726         hrorig->hr_preqid = preq->preq_id;
 727         hrorig->hr_seq = preq->preq_origseq;
 728
 729         /*
 730          * Check if the PREQ is addressed to us.
 731          */
 732         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
 733                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 734                     "reply to %s", ether_sprintf(preq->preq_origaddr));
 735                 /*
 736                  * Build and send a PREP frame.
 737                  */
 738                 prep.prep_flags = 0;
 739                 prep.prep_hopcount = 0;
 740                 prep.prep_ttl = ms->ms_ttl;
 741                 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
 742                 prep.prep_targetseq = ++hs->hs_seq;
 743                 prep.prep_lifetime = preq->preq_lifetime;
 744                 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 745                 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
 746                 prep.prep_origseq = preq->preq_origseq;
 747                 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep);
 748                 /*
 749                  * Build the reverse path, if we don't have it already.
 750                  */
 751                 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
 752                 if (rt == NULL)
 753                         hwmp_discover(vap, preq->preq_origaddr, NULL);
 754                 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)
 755                         hwmp_discover(vap, rt->rt_dest, NULL);
 756                 return;
 757         }
 758         /*
 759          * Proactive PREQ: reply with a proactive PREP to the
 760          * root STA if requested.
 761          */
 762         if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
 763             (PREQ_TFLAGS(0) &
 764             ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) ==
 765             (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) {
 766                 uint8_t rootmac[IEEE80211_ADDR_LEN];
 767
 768                 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr);
 769                 rt = ieee80211_mesh_rt_find(vap, rootmac);
 770                 if (rt == NULL) {
 771                         rt = ieee80211_mesh_rt_add(vap, rootmac);
 772                         if (rt == NULL) {
 773                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 774                                     "unable to add root mesh path to %s",
 775                                     ether_sprintf(rootmac));
 776                                 vap->iv_stats.is_mesh_rtaddfailed++;
 777                                 return;
 778                         }
 779                 }
 780                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 781                     "root mesh station @ %s", ether_sprintf(rootmac));
 782
 783                 /*
 784                  * Reply with a PREP if we don't have a path to the root
 785                  * or if the root sent us a proactive PREQ.
 786                  */
 787                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
 788                     (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
 789                         prep.prep_flags = 0;
 790                         prep.prep_hopcount = 0;
 791                         prep.prep_ttl = ms->ms_ttl;
 792                         IEEE80211_ADDR_COPY(prep.prep_origaddr, rootmac);
 793                         prep.prep_origseq = preq->preq_origseq;
 794                         prep.prep_lifetime = preq->preq_lifetime;
 795                         prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 796                         IEEE80211_ADDR_COPY(prep.prep_targetaddr,
 797                             vap->iv_myaddr);
 798                         prep.prep_targetseq = ++hs->hs_seq;
 799                         hwmp_send_prep(vap->iv_bss, vap->iv_myaddr,
 800                             broadcastaddr, &prep);
 801                 }
 802                 hwmp_discover(vap, rootmac, NULL);
 803                 return;
 804         }
 805         rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
 806
 807         /*
 808          * Forwarding and Intermediate reply for PREQs with 1 target.
 809          */
 810         if (preq->preq_tcount == 1) {
 811                 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
 812
 813                 memcpy(&ppreq, preq, sizeof(ppreq));
 814                 /*
 815                  * We have a valid route to this node.
 816                  */
 817                 if (rt != NULL &&
 818                     (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
 819                         if (preq->preq_ttl > 1 &&
 820                             preq->preq_hopcount < hs->hs_maxhops) {
 821                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 822                                     "forward PREQ from %s",
 823                                     ether_sprintf(preq->preq_origaddr));
 824                                 /*
 825                                  * Propagate the original PREQ.
 826                                  */
 827                                 ppreq.preq_hopcount += 1;
 828                                 ppreq.preq_ttl -= 1;
 829                                 ppreq.preq_metric +=
 830                                     ms->ms_pmetric->mpm_metric(ni);
 831                                 /*
 832                                  * Set TO and unset RF bits because we are going
 833                                  * to send a PREP next.
 834                                  */
 835                                 ppreq.preq_targets[0].target_flags |=
 836                                     IEEE80211_MESHPREQ_TFLAGS_TO;
 837                                 ppreq.preq_targets[0].target_flags &=
 838                                     ~IEEE80211_MESHPREQ_TFLAGS_RF;
 839                                 hwmp_send_preq(ni, vap->iv_myaddr,
 840                                     broadcastaddr, &ppreq);
 841                         }
 842                         /*
 843                          * Check if we can send an intermediate Path Reply,
 844                          * i.e., Target Only bit is not set.
 845                          */
 846                         if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
 847                                 struct ieee80211_meshprep_ie prep;
 848
 849                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 850                                     "intermediate reply for PREQ from %s",
 851                                     ether_sprintf(preq->preq_origaddr));
 852                                 prep.prep_flags = 0;
 853                                 prep.prep_hopcount = rt->rt_nhops + 1;
 854                                 prep.prep_ttl = ms->ms_ttl;
 855                                 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
 856                                     PREQ_TADDR(0));
 857                                 prep.prep_targetseq = hrorig->hr_seq;
 858                                 prep.prep_lifetime = preq->preq_lifetime;
 859                                 prep.prep_metric = rt->rt_metric +
 860                                     ms->ms_pmetric->mpm_metric(ni);
 861                                 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
 862                                     preq->preq_origaddr);
 863                                 prep.prep_origseq = hrorig->hr_seq;
 864                                 hwmp_send_prep(ni, vap->iv_myaddr,
 865                                     broadcastaddr, &prep);
 866                         }
 867                 /*
 868                  * We have no information about this path,
 869                  * propagate the PREQ.
 870                  */
 871                 } else if (preq->preq_ttl > 1 &&
 872                     preq->preq_hopcount < hs->hs_maxhops) {
 873                         if (rt == NULL) {
 874                                 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0));
 875                                 if (rt == NULL) {
 876                                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
 877                                             ni, "unable to add PREQ path to %s",
 878                                             ether_sprintf(PREQ_TADDR(0)));
 879                                         vap->iv_stats.is_mesh_rtaddfailed++;
 880                                         return;
 881                                 }
 882                         }
 883                         rt->rt_metric = preq->preq_metric;
 884                         rt->rt_lifetime = preq->preq_lifetime;
 885                         hrorig = IEEE80211_MESH_ROUTE_PRIV(rt,
 886                             struct ieee80211_hwmp_route);
 887                         hrorig->hr_seq = preq->preq_origseq;
 888                         hrorig->hr_preqid = preq->preq_id;
 889
 890                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 891                             "forward PREQ from %s",
 892                             ether_sprintf(preq->preq_origaddr));
 893                         ppreq.preq_hopcount += 1;
 894                         ppreq.preq_ttl -= 1;
 895                         ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
 896                         hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr,
 897                             &ppreq);
 898                 }
 899         }
 900
 901 }
 902 #undef  PREQ_TFLAGS
 903 #undef  PREQ_TADDR
 904 #undef  PREQ_TSEQ
 905
 906 static int
 907 hwmp_send_preq(struct ieee80211_node *ni,
 908     const uint8_t sa[IEEE80211_ADDR_LEN],
 909     const uint8_t da[IEEE80211_ADDR_LEN],
 910     struct ieee80211_meshpreq_ie *preq)
 911 {
 912         struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
 913
 914         /*
 915          * Enforce PREQ interval.
 916          */
 917         if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0)
 918                 return EALREADY;
 919         getmicrouptime(&hs->hs_lastpreq);
 920
 921         /*
 922          * mesh preq action frame format
 923          *     [6] da
 924          *     [6] sa
 925          *     [6] addr3 = sa
 926          *     [1] action
 927          *     [1] category
 928          *     [tlv] mesh path request
 929          */
 930         preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
 931         return hwmp_send_action(ni, sa, da, (uint8_t *)preq,
 932             sizeof(struct ieee80211_meshpreq_ie));
 933 }
 934
 935 static void
 936 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
 937     const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
 938 {
 939         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 940         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 941         struct ieee80211_mesh_route *rt = NULL;
 942         struct ieee80211_hwmp_route *hr;
 943         struct ieee80211com *ic = vap->iv_ic;
 944         struct ifnet *ifp = vap->iv_ifp;
 945         struct mbuf *m, *next;
 946
 947         /*
 948          * Acceptance criteria: if the corresponding PREQ was not generated
 949          * by us and forwarding is disabled, discard this PREP.
 950          */
 951         if (ni == vap->iv_bss ||
 952             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 953                 return;
 954         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
 955             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
 956                 return;
 957
 958         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 959             "received PREP from %s", ether_sprintf(prep->prep_targetaddr));
 960
 961         rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
 962         if (rt == NULL) {
 963                 /*
 964                  * If we have no entry this could be a reply to a root PREQ.
 965                  */
 966                 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) {
 967                         rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
 968                         if (rt == NULL) {
 969                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
 970                                     ni, "unable to add PREP path to %s",
 971                                     ether_sprintf(prep->prep_targetaddr));
 972                                 vap->iv_stats.is_mesh_rtaddfailed++;
 973                                 return;
 974                         }
 975                         IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
 976                         rt->rt_nhops = prep->prep_hopcount;
 977                         rt->rt_lifetime = prep->prep_lifetime;
 978                         rt->rt_metric = prep->prep_metric;
 979                         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
 980                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 981                             "add root path to %s nhops %d metric %d (PREP)",
 982                             ether_sprintf(prep->prep_targetaddr),
 983                             rt->rt_nhops, rt->rt_metric);
 984                         return;
 985                 }
 986                 return;
 987         }
 988         /*
 989          * Sequence number validation.
 990          */
 991         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 992         if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq)) {
 993                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 994                     "discard PREP from %s, old seq no %u <= %u",
 995                     ether_sprintf(prep->prep_targetaddr),
 996                     prep->prep_targetseq, hr->hr_seq);
 997                 return;
 998         }
 999         hr->hr_seq = prep->prep_targetseq;
1000         /*
1001          * If it's NOT for us, propagate the PREP.
1002          */
1003         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1004             prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) {
1005                 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1006
1007                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1008                     "propagate PREP from %s",
1009                     ether_sprintf(prep->prep_targetaddr));
1010
1011                 memcpy(&pprep, prep, sizeof(pprep));
1012                 pprep.prep_hopcount += 1;
1013                 pprep.prep_ttl -= 1;
1014                 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1015                 IEEE80211_ADDR_COPY(pprep.prep_targetaddr, vap->iv_myaddr);
1016                 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep);
1017         }
1018         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1019         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1020                 /* NB: never clobber a proxy entry */;
1021                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1022                     "discard PREP for %s, route is marked PROXY",
1023                     ether_sprintf(prep->prep_targetaddr));
1024                 vap->iv_stats.is_hwmp_proxy++;
1025         } else if (prep->prep_origseq == hr->hr_origseq) {
1026                 /*
1027                  * Check if we already have a path to this node.
1028                  * If we do, check if this path reply contains a
1029                  * better route.
1030                  */
1031                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1032                     (prep->prep_hopcount < rt->rt_nhops ||
1033                      prep->prep_metric < rt->rt_metric)) {
1034                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1035                             "%s path to %s, hopcount %d:%d metric %d:%d",
1036                             rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1037                                 "prefer" : "update",
1038                             ether_sprintf(prep->prep_origaddr),
1039                             rt->rt_nhops, prep->prep_hopcount,
1040                             rt->rt_metric, prep->prep_metric);
1041                         IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
1042                         rt->rt_nhops = prep->prep_hopcount;
1043                         rt->rt_lifetime = prep->prep_lifetime;
1044                         rt->rt_metric = prep->prep_metric;
1045                         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
1046                 } else {
1047                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1048                             "ignore PREP for %s, hopcount %d:%d metric %d:%d",
1049                             ether_sprintf(prep->prep_targetaddr),
1050                             rt->rt_nhops, prep->prep_hopcount,
1051                             rt->rt_metric, prep->prep_metric);
1052                 }
1053         } else {
1054                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1055                     "discard PREP for %s, wrong seqno %u != %u",
1056                     ether_sprintf(prep->prep_targetaddr), prep->prep_origseq,
1057                     hr->hr_seq);
1058                 vap->iv_stats.is_hwmp_wrongseq++;
1059         }
1060         /*
1061          * Check for frames queued awaiting path discovery.
1062          * XXX probably can tell exactly and avoid remove call
1063          * NB: hash may have false matches, if so they will get
1064          *     stuck back on the stageq because there won't be
1065          *     a path.
1066          */
1067         m = ieee80211_ageq_remove(&ic->ic_stageq,
1068             (struct ieee80211_node *)(uintptr_t)
1069                 ieee80211_mac_hash(ic, rt->rt_dest));
1070         for (; m != NULL; m = next) {
1071                 next = m->m_nextpkt;
1072                 m->m_nextpkt = NULL;
1073                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1074                     "flush queued frame %p len %d", m, m->m_pkthdr.len);
1075                 ifp->if_transmit(ifp, m);
1076         }
1077 }
1078
1079 static int
1080 hwmp_send_prep(struct ieee80211_node *ni,
1081     const uint8_t sa[IEEE80211_ADDR_LEN],
1082     const uint8_t da[IEEE80211_ADDR_LEN],
1083     struct ieee80211_meshprep_ie *prep)
1084 {
1085         /* NB: there's no PREP minimum interval. */
1086
1087         /*
1088          * mesh prep action frame format
1089          *     [6] da
1090          *     [6] sa
1091          *     [6] addr3 = sa
1092          *     [1] action
1093          *     [1] category
1094          *     [tlv] mesh path reply
1095          */
1096         prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1097         return hwmp_send_action(ni, sa, da, (uint8_t *)prep,
1098             sizeof(struct ieee80211_meshprep_ie));
1099 }
1100
1101 #define PERR_DFLAGS(n)  perr.perr_dests[n].dest_flags
1102 #define PERR_DADDR(n)   perr.perr_dests[n].dest_addr
1103 #define PERR_DSEQ(n)    perr.perr_dests[n].dest_seq
1104 #define PERR_DRCODE(n)  perr.perr_dests[n].dest_rcode
1105 static void
1106 hwmp_peerdown(struct ieee80211_node *ni)
1107 {
1108         struct ieee80211vap *vap = ni->ni_vap;
1109         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1110         struct ieee80211_meshperr_ie perr;
1111         struct ieee80211_mesh_route *rt;
1112         struct ieee80211_hwmp_route *hr;
1113
1114         rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1115         if (rt == NULL)
1116                 return;
1117         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1118         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1119             "%s", "delete route entry");
1120         perr.perr_ttl = ms->ms_ttl;
1121         perr.perr_ndests = 1;
1122         PERR_DFLAGS(0) = 0;
1123         if (hr->hr_seq == 0)
1124                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1125         PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1126         IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1127         PERR_DSEQ(0) = hr->hr_seq;
1128         PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1129         /* NB: flush everything passing through peer */
1130         ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1131         hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr);
1132 }
1133 #undef  PERR_DFLAGS
1134 #undef  PERR_DADDR
1135 #undef  PERR_DSEQ
1136 #undef  PERR_DRCODE
1137
1138 #define PERR_DFLAGS(n)  perr->perr_dests[n].dest_flags
1139 #define PERR_DADDR(n)   perr->perr_dests[n].dest_addr
1140 #define PERR_DSEQ(n)    perr->perr_dests[n].dest_seq
1141 #define PERR_DRCODE(n)  perr->perr_dests[n].dest_rcode
1142 static void
1143 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1144     const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1145 {
1146         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1147         struct ieee80211_mesh_route *rt = NULL;
1148         struct ieee80211_hwmp_route *hr;
1149         struct ieee80211_meshperr_ie pperr;
1150         int i, forward = 0;
1151
1152         /*
1153          * Acceptance criteria: check if we received a PERR from a
1154          * neighbor and forwarding is enabled.
1155          */
1156         if (ni == vap->iv_bss ||
1157             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1158             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
1159                 return;
1160         /*
1161          * Find all routing entries that match and delete them.
1162          */
1163         for (i = 0; i < perr->perr_ndests; i++) {
1164                 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1165                 if (rt == NULL)
1166                         continue;
1167                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1168                 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) &&
1169                     HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) {
1170                         ieee80211_mesh_rt_del(vap, rt->rt_dest);
1171                         ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest);
1172                         rt = NULL;
1173                         forward = 1;
1174                 }
1175         }
1176         /*
1177          * Propagate the PERR if we previously found it on our routing table.
1178          * XXX handle ndest > 1
1179          */
1180         if (forward && perr->perr_ttl > 1) {
1181                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1182                     "propagate PERR from %s", ether_sprintf(wh->i_addr2));
1183                 memcpy(&pperr, perr, sizeof(*perr));
1184                 pperr.perr_ttl--;
1185                 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
1186                     &pperr);
1187         }
1188 }
1189 #undef  PEER_DADDR
1190 #undef  PERR_DSEQ
1191
1192 static int
1193 hwmp_send_perr(struct ieee80211_node *ni,
1194     const uint8_t sa[IEEE80211_ADDR_LEN],
1195     const uint8_t da[IEEE80211_ADDR_LEN],
1196     struct ieee80211_meshperr_ie *perr)
1197 {
1198         struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
1199
1200         /*
1201          * Enforce PERR interval.
1202          */
1203         if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1204                 return EALREADY;
1205         getmicrouptime(&hs->hs_lastperr);
1206
1207         /*
1208          * mesh perr action frame format
1209          *     [6] da
1210          *     [6] sa
1211          *     [6] addr3 = sa
1212          *     [1] action
1213          *     [1] category
1214          *     [tlv] mesh path error
1215          */
1216         perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1217         return hwmp_send_action(ni, sa, da, (uint8_t *)perr,
1218             sizeof(struct ieee80211_meshperr_ie));
1219 }
1220
1221 static void
1222 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1223     const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1224 {
1225         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1226         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1227         struct ieee80211_mesh_route *rt = NULL;
1228         struct ieee80211_hwmp_route *hr;
1229         struct ieee80211_meshrann_ie prann;
1230
1231         if (ni == vap->iv_bss ||
1232             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1233             IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1234                 return;
1235
1236         rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1237         /*
1238          * Discover the path to the root mesh STA.
1239          * If we already know it, propagate the RANN element.
1240          */
1241         if (rt == NULL) {
1242                 hwmp_discover(vap, rann->rann_addr, NULL);
1243                 return;
1244         }
1245         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1246         if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq)) {
1247                 hr->hr_seq = rann->rann_seq;
1248                 if (rann->rann_ttl > 1 &&
1249                     rann->rann_hopcount < hs->hs_maxhops &&
1250                     (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1251                         memcpy(&prann, rann, sizeof(prann));
1252                         prann.rann_hopcount += 1;
1253                         prann.rann_ttl -= 1;
1254                         prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1255                         hwmp_send_rann(vap->iv_bss, vap->iv_myaddr,
1256                             broadcastaddr, &prann);
1257                 }
1258         }
1259 }
1260
1261 static int
1262 hwmp_send_rann(struct ieee80211_node *ni,
1263     const uint8_t sa[IEEE80211_ADDR_LEN],
1264     const uint8_t da[IEEE80211_ADDR_LEN],
1265     struct ieee80211_meshrann_ie *rann)
1266 {
1267         /*
1268          * mesh rann action frame format
1269          *     [6] da
1270          *     [6] sa
1271          *     [6] addr3 = sa
1272          *     [1] action
1273          *     [1] category
1274          *     [tlv] root annoucement
1275          */
1276         rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1277         return hwmp_send_action(ni, sa, da, (uint8_t *)rann,
1278             sizeof(struct ieee80211_meshrann_ie));
1279 }
1280
1281 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
1282 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
1283 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
1284 static struct ieee80211_node *
1285 hwmp_discover(struct ieee80211vap *vap,
1286     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1287 {
1288         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1289         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1290         struct ieee80211_mesh_route *rt = NULL;
1291         struct ieee80211_hwmp_route *hr;
1292         struct ieee80211_meshpreq_ie preq;
1293         struct ieee80211_node *ni;
1294         int sendpreq = 0;
1295
1296         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1297             ("not a mesh vap, opmode %d", vap->iv_opmode));
1298
1299         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1300             ("%s: discovering self!", __func__));
1301
1302         ni = NULL;
1303         if (!IEEE80211_IS_MULTICAST(dest)) {
1304                 rt = ieee80211_mesh_rt_find(vap, dest);
1305                 if (rt == NULL) {
1306                         rt = ieee80211_mesh_rt_add(vap, dest);
1307                         if (rt == NULL) {
1308                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1309                                     ni, "unable to add discovery path to %s",
1310                                     ether_sprintf(dest));
1311                                 vap->iv_stats.is_mesh_rtaddfailed++;
1312                                 goto done;
1313                         }
1314                 }
1315                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1316                     struct ieee80211_hwmp_route);
1317                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1318                         if (hr->hr_origseq == 0)
1319                                 hr->hr_origseq = ++hs->hs_seq;
1320                         rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1321                         rt->rt_lifetime =
1322                             ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1323                         /* XXX check preq retries */
1324                         sendpreq = 1;
1325                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1326                             "start path discovery (src %s)",
1327                             m == NULL ? "<none>" : ether_sprintf(
1328                                 mtod(m, struct ether_header *)->ether_shost));
1329                         /*
1330                          * Try to discover the path for this node.
1331                          */
1332                         preq.preq_flags = 0;
1333                         preq.preq_hopcount = 0;
1334                         preq.preq_ttl = ms->ms_ttl;
1335                         preq.preq_id = ++hs->hs_preqid;
1336                         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1337                         preq.preq_origseq = hr->hr_origseq;
1338                         preq.preq_lifetime = rt->rt_lifetime;
1339                         preq.preq_metric = rt->rt_metric;
1340                         preq.preq_tcount = 1;
1341                         IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1342                         PREQ_TFLAGS(0) = 0;
1343                         if (ieee80211_hwmp_targetonly)
1344                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1345                         if (ieee80211_hwmp_replyforward)
1346                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF;
1347                         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1348                         PREQ_TSEQ(0) = 0;
1349                         /* XXX check return value */
1350                         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
1351                             broadcastaddr, &preq);
1352                 }
1353                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1354                         ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
1355         } else {
1356                 ni = ieee80211_find_txnode(vap, dest);
1357                 /* NB: if null then we leak mbuf */
1358                 KASSERT(ni != NULL, ("leak mcast frame"));
1359                 return ni;
1360         }
1361 done:
1362         if (ni == NULL && m != NULL) {
1363                 if (sendpreq) {
1364                         struct ieee80211com *ic = vap->iv_ic;
1365                         /*
1366                          * Queue packet for transmit when path discovery
1367                          * completes.  If discovery never completes the
1368                          * frame will be flushed by way of the aging timer.
1369                          */
1370                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1371                             "%s", "queue frame until path found");
1372                         m->m_pkthdr.rcvif = (void *)(uintptr_t)
1373                             ieee80211_mac_hash(ic, dest);
1374                         /* XXX age chosen randomly */
1375                         ieee80211_ageq_append(&ic->ic_stageq, m,
1376                             IEEE80211_INACT_WAIT);
1377                 } else {
1378                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1379                             dest, NULL, "%s", "no valid path to this node");
1380                         m_freem(m);
1381                 }
1382         }
1383         return ni;
1384 }
1385 #undef  PREQ_TFLAGS
1386 #undef  PREQ_TADDR
1387 #undef  PREQ_TSEQ
1388
1389 static int
1390 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1391 {
1392         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1393         int error;
1394
1395         if (vap->iv_opmode != IEEE80211_M_MBSS)
1396                 return ENOSYS;
1397         error = 0;
1398         switch (ireq->i_type) {
1399         case IEEE80211_IOC_HWMP_ROOTMODE:
1400                 ireq->i_val = hs->hs_rootmode;
1401                 break;
1402         case IEEE80211_IOC_HWMP_MAXHOPS:
1403                 ireq->i_val = hs->hs_maxhops;
1404                 break;
1405         default:
1406                 return ENOSYS;
1407         }
1408         return error;
1409 }
1410 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
1411
1412 static int
1413 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1414 {
1415         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1416         int error;
1417
1418         if (vap->iv_opmode != IEEE80211_M_MBSS)
1419                 return ENOSYS;
1420         error = 0;
1421         switch (ireq->i_type) {
1422         case IEEE80211_IOC_HWMP_ROOTMODE:
1423                 if (ireq->i_val < 0 || ireq->i_val > 3)
1424                         return EINVAL;
1425                 hs->hs_rootmode = ireq->i_val;
1426                 hwmp_rootmode_setup(vap);
1427                 break;
1428         case IEEE80211_IOC_HWMP_MAXHOPS:
1429                 if (ireq->i_val <= 0 || ireq->i_val > 255)
1430                         return EINVAL;
1431                 hs->hs_maxhops = ireq->i_val;
1432                 break;
1433         default:
1434                 return ENOSYS;
1435         }
1436         return error;
1437 }
1438 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);