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                     struct timeval *, struct timeval *);
  94 static void     hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
  95                     const struct ieee80211_frame *,
  96                     const struct ieee80211_meshprep_ie *);
  97 static int      hwmp_send_prep(struct ieee80211_node *,
  98                     const uint8_t [IEEE80211_ADDR_LEN],
  99                     const uint8_t [IEEE80211_ADDR_LEN],
 100                     struct ieee80211_meshprep_ie *);
 101 static void     hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
 102                     const struct ieee80211_frame *,
 103                     const struct ieee80211_meshperr_ie *);
 104 static int      hwmp_send_perr(struct ieee80211_node *,
 105                     const uint8_t [IEEE80211_ADDR_LEN],
 106                     const uint8_t [IEEE80211_ADDR_LEN],
 107                     struct ieee80211_meshperr_ie *);
 108 static void     hwmp_senderror(struct ieee80211vap *,
 109                     const uint8_t [IEEE80211_ADDR_LEN],
 110                     struct ieee80211_mesh_route *, int);
 111 static void     hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
 112                    const struct ieee80211_frame *,
 113                    const struct ieee80211_meshrann_ie *);
 114 static int      hwmp_send_rann(struct ieee80211_node *,
 115                     const uint8_t [IEEE80211_ADDR_LEN],
 116                     const uint8_t [IEEE80211_ADDR_LEN],
 117                     struct ieee80211_meshrann_ie *);
 118 static struct ieee80211_node *
 119                 hwmp_discover(struct ieee80211vap *,
 120                     const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
 121 static void     hwmp_peerdown(struct ieee80211_node *);
 122
 123 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
 124 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
 125
 126 /* unalligned little endian access */
 127 #define LE_WRITE_2(p, v) do {                           \
 128         ((uint8_t *)(p))[0] = (v) & 0xff;               \
 129         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
 130 } while (0)
 131 #define LE_WRITE_4(p, v) do {                           \
 132         ((uint8_t *)(p))[0] = (v) & 0xff;               \
 133         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
 134         ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff;       \
 135         ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff;       \
 136 } while (0)
 137
 138
 139 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
 140 static const uint8_t    broadcastaddr[IEEE80211_ADDR_LEN] =
 141         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 142
 143 typedef uint32_t ieee80211_hwmp_seq;
 144 #define HWMP_SEQ_LT(a, b)       ((int32_t)((a)-(b)) < 0)
 145 #define HWMP_SEQ_LEQ(a, b)      ((int32_t)((a)-(b)) <= 0)
 146 #define HWMP_SEQ_EQ(a, b)       ((int32_t)((a)-(b)) == 0)
 147 #define HWMP_SEQ_GT(a, b)       ((int32_t)((a)-(b)) > 0)
 148 #define HWMP_SEQ_GEQ(a, b)      ((int32_t)((a)-(b)) >= 0)
 149
 150 #define HWMP_SEQ_MAX(a, b)      (a > b ? a : b)
 151
 152 /*
 153  * Private extension of ieee80211_mesh_route.
 154  */
 155 struct ieee80211_hwmp_route {
 156         ieee80211_hwmp_seq      hr_seq;         /* last HWMP seq seen from dst*/
 157         ieee80211_hwmp_seq      hr_preqid;      /* last PREQ ID seen from dst */
 158         ieee80211_hwmp_seq      hr_origseq;     /* seq. no. on our latest PREQ*/
 159         struct timeval          hr_lastpreq;    /* last time we sent a PREQ */
 160         struct timeval          hr_lastrootconf; /* last sent PREQ root conf */
 161         int                     hr_preqretries; /* number of discoveries */
 162         int                     hr_lastdiscovery; /* last discovery in ticks */
 163 };
 164 struct ieee80211_hwmp_state {
 165         ieee80211_hwmp_seq      hs_seq;         /* next seq to be used */
 166         ieee80211_hwmp_seq      hs_preqid;      /* next PREQ ID to be used */
 167         int                     hs_rootmode;    /* proactive HWMP */
 168         struct timeval          hs_lastperr;    /* last time we sent a PERR */
 169         struct callout          hs_roottimer;
 170         uint8_t                 hs_maxhops;     /* max hop count */
 171 };
 172
 173 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
 174     "IEEE 802.11s HWMP parameters");
 175 static int      ieee80211_hwmp_targetonly = 0;
 176 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW,
 177     &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
 178 static int      ieee80211_hwmp_pathtimeout = -1;
 179 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
 180     &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 181     "path entry lifetime (ms)");
 182 static int      ieee80211_hwmp_maxpreq_retries = -1;
 183 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW,
 184     &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
 185     "maximum number of preq retries");
 186 static int      ieee80211_hwmp_net_diameter_traversaltime = -1;
 187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
 188     CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0,
 189     ieee80211_sysctl_msecs_ticks, "I",
 190     "estimate travelse time across the MBSS (ms)");
 191 static int      ieee80211_hwmp_roottimeout = -1;
 192 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
 193     &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
 194     "root PREQ timeout (ms)");
 195 static int      ieee80211_hwmp_rootint = -1;
 196 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
 197     &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
 198     "root interval (ms)");
 199 static int      ieee80211_hwmp_rannint = -1;
 200 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
 201     &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
 202     "root announcement interval (ms)");
 203 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
 204 static int      ieee80211_hwmp_rootconfint_internal = -1;
 205 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD,
 206     &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
 207     "root confirmation interval (ms) (read-only)");
 208
 209 #define IEEE80211_HWMP_DEFAULT_MAXHOPS  31
 210
 211 static  ieee80211_recv_action_func hwmp_recv_action_meshpath;
 212
 213 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
 214         .mpp_descr      = "HWMP",
 215         .mpp_ie         = IEEE80211_MESHCONF_PATH_HWMP,
 216         .mpp_discover   = hwmp_discover,
 217         .mpp_peerdown   = hwmp_peerdown,
 218         .mpp_senderror  = hwmp_senderror,
 219         .mpp_vattach    = hwmp_vattach,
 220         .mpp_vdetach    = hwmp_vdetach,
 221         .mpp_newstate   = hwmp_newstate,
 222         .mpp_privlen    = sizeof(struct ieee80211_hwmp_route),
 223 };
 224 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
 225         &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
 226         "mesh route inactivity timeout (ms)");
 227
 228
 229 static void
 230 ieee80211_hwmp_init(void)
 231 {
 232         /* Default values as per amendment */
 233         ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
 234         ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
 235         ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
 236         ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
 237         ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
 238         ieee80211_hwmp_maxpreq_retries = 3;
 239         /*
 240          * (TU): A measurement of time equal to 1024 μs,
 241          * 500 TU is 512 ms.
 242          */
 243         ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
 244
 245         /*
 246          * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
 247          * and return a struct timeval...
 248          */
 249         ieee80211_hwmp_rootconfint.tv_usec =
 250             ieee80211_hwmp_rootconfint_internal * 1000;
 251
 252         /*
 253          * Register action frame handler.
 254          */
 255         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
 256             IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
 257
 258         /* NB: default is 5 secs per spec */
 259         mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
 260
 261         /*
 262          * Register HWMP.
 263          */
 264         ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
 265 }
 266 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
 267
 268 void
 269 hwmp_vattach(struct ieee80211vap *vap)
 270 {
 271         struct ieee80211_hwmp_state *hs;
 272
 273         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
 274             ("not a mesh vap, opmode %d", vap->iv_opmode));
 275
 276         hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
 277             M_NOWAIT | M_ZERO);
 278         if (hs == NULL) {
 279                 printf("%s: couldn't alloc HWMP state\n", __func__);
 280                 return;
 281         }
 282         hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
 283         callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE);
 284         vap->iv_hwmp = hs;
 285 }
 286
 287 void
 288 hwmp_vdetach(struct ieee80211vap *vap)
 289 {
 290         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 291
 292         callout_drain(&hs->hs_roottimer);
 293         free(vap->iv_hwmp, M_80211_VAP);
 294         vap->iv_hwmp = NULL;
 295 }
 296
 297 int
 298 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
 299 {
 300         enum ieee80211_state nstate = vap->iv_state;
 301         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 302
 303         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 304             __func__, ieee80211_state_name[ostate],
 305             ieee80211_state_name[nstate], arg);
 306
 307         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
 308                 callout_drain(&hs->hs_roottimer);
 309         if (nstate == IEEE80211_S_RUN)
 310                 hwmp_rootmode_setup(vap);
 311         return 0;
 312 }
 313
 314 /*
 315  * Verify the length of an HWMP PREQ and return the number
 316  * of destinations >= 1, if verification fails -1 is returned.
 317  */
 318 static int
 319 verify_mesh_preq_len(struct ieee80211vap *vap,
 320     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 321 {
 322         int alloc_sz = -1;
 323         int ndest = -1;
 324         if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
 325                 /* Originator External Address  present */
 326                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ_AE;
 327                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
 328         } else {
 329                 /* w/o Originator External Address */
 330                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ;
 331                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
 332         }
 333         alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
 334
 335         if(iefrm[1] != (alloc_sz)) {
 336                 IEEE80211_DISCARD(vap,
 337                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 338                     wh, NULL, "PREQ (AE=%s) with wrong len",
 339                     iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0");
 340                 return (-1);
 341         }
 342         return ndest;
 343 }
 344
 345 /*
 346  * Verify the length of an HWMP PREP and returns 1 on success,
 347  * otherwise -1.
 348  */
 349 static int
 350 verify_mesh_prep_len(struct ieee80211vap *vap,
 351     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 352 {
 353         int alloc_sz = -1;
 354         if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
 355                 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
 356                         alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
 357         } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
 358                 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
 359         if(alloc_sz < 0) {
 360                 IEEE80211_DISCARD(vap,
 361                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 362                     wh, NULL, "PREP (AE=%s) with wrong len",
 363                     iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0");
 364                 return (-1);
 365         }
 366         return (1);
 367 }
 368
 369 /*
 370  * Verify the length of an HWMP PERR and return the number
 371  * of destinations >= 1, if verification fails -1 is returned.
 372  */
 373 static int
 374 verify_mesh_perr_len(struct ieee80211vap *vap,
 375     const struct ieee80211_frame *wh, const uint8_t *iefrm)
 376 {
 377         int alloc_sz = -1;
 378         const uint8_t *iefrm_t = iefrm;
 379         uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
 380         int i;
 381
 382         if(ndest > IEEE80211_MESHPERR_MAXDEST) {
 383                 IEEE80211_DISCARD(vap,
 384                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 385                     wh, NULL, "PERR with wrong number of destionat (>19), %u",
 386                     ndest);
 387                 return (-1);
 388         }
 389
 390         iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
 391         /* We need to check each destionation flag to know size */
 392         for(i = 0; i<ndest; i++) {
 393                 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
 394                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
 395                 else
 396                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
 397         }
 398
 399         alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
 400         if(alloc_sz !=  iefrm[1]) {
 401                 IEEE80211_DISCARD(vap,
 402                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 403                     wh, NULL, "%s", "PERR with wrong len");
 404                 return (-1);
 405         }
 406         return ndest;
 407 }
 408
 409 static int
 410 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
 411         const struct ieee80211_frame *wh,
 412         const uint8_t *frm, const uint8_t *efrm)
 413 {
 414         struct ieee80211vap *vap = ni->ni_vap;
 415         struct ieee80211_meshpreq_ie *preq;
 416         struct ieee80211_meshprep_ie *prep;
 417         struct ieee80211_meshperr_ie *perr;
 418         struct ieee80211_meshrann_ie rann;
 419         const uint8_t *iefrm = frm + 2; /* action + code */
 420         const uint8_t *iefrm_t = iefrm; /* temporary pointer */
 421         int ndest = -1;
 422         int found = 0;
 423
 424         while (efrm - iefrm > 1) {
 425                 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
 426                 switch (*iefrm) {
 427                 case IEEE80211_ELEMID_MESHPREQ:
 428                 {
 429                         int i = 0;
 430
 431                         iefrm_t = iefrm;
 432                         ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
 433                         if (ndest < 0) {
 434                                 vap->iv_stats.is_rx_mgtdiscard++;
 435                                 break;
 436                         }
 437                         preq = malloc(sizeof(*preq) +
 438                             (ndest - 1) * sizeof(*preq->preq_targets),
 439                             M_80211_MESH_PREQ, M_NOWAIT | M_ZERO);
 440                         KASSERT(preq != NULL, ("preq == NULL"));
 441
 442                         preq->preq_ie = *iefrm_t++;
 443                         preq->preq_len = *iefrm_t++;
 444                         preq->preq_flags = *iefrm_t++;
 445                         preq->preq_hopcount = *iefrm_t++;
 446                         preq->preq_ttl = *iefrm_t++;
 447                         preq->preq_id = LE_READ_4(iefrm_t); iefrm_t += 4;
 448                         IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
 449                         iefrm_t += 6;
 450                         preq->preq_origseq = LE_READ_4(iefrm_t); iefrm_t += 4;
 451                         /* NB: may have Originator Proxied Address */
 452                         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE)  {
 453                                 IEEE80211_ADDR_COPY(
 454                                     preq->preq_orig_ext_addr, iefrm_t);
 455                                 iefrm_t += 6;
 456                         }
 457                         preq->preq_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4;
 458                         preq->preq_metric = LE_READ_4(iefrm_t); iefrm_t += 4;
 459                         preq->preq_tcount = *iefrm_t++;
 460
 461                         for (i = 0; i < preq->preq_tcount; i++) {
 462                                 preq->preq_targets[i].target_flags = *iefrm_t++;
 463                                 IEEE80211_ADDR_COPY(
 464                                     preq->preq_targets[i].target_addr, iefrm_t);
 465                                 iefrm_t += 6;
 466                                 preq->preq_targets[i].target_seq =
 467                                     LE_READ_4(iefrm_t);
 468                                 iefrm_t += 4;
 469                         }
 470
 471                         hwmp_recv_preq(vap, ni, wh, preq);
 472                         free(preq, M_80211_MESH_PREQ);
 473                         found++;
 474                         break;
 475                 }
 476                 case IEEE80211_ELEMID_MESHPREP:
 477                 {
 478                         iefrm_t = iefrm;
 479                         ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
 480                         if (ndest < 0) {
 481                                 vap->iv_stats.is_rx_mgtdiscard++;
 482                                 break;
 483                         }
 484                         prep = malloc(sizeof(*prep),
 485                             M_80211_MESH_PREP, M_NOWAIT | M_ZERO);
 486                         KASSERT(prep != NULL, ("prep == NULL"));
 487
 488                         prep->prep_ie = *iefrm_t++;
 489                         prep->prep_len = *iefrm_t++;
 490                         prep->prep_flags = *iefrm_t++;
 491                         prep->prep_hopcount = *iefrm_t++;
 492                         prep->prep_ttl = *iefrm_t++;
 493                         IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
 494                         iefrm_t += 6;
 495                         prep->prep_targetseq = LE_READ_4(iefrm_t); iefrm_t += 4;
 496                         /* NB: May have Target Proxied Address */
 497                         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE)  {
 498                                 IEEE80211_ADDR_COPY(
 499                                     prep->prep_target_ext_addr, iefrm_t);
 500                                 iefrm_t += 6;
 501                         }
 502                         prep->prep_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4;
 503                         prep->prep_metric = LE_READ_4(iefrm_t); iefrm_t += 4;
 504                         IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
 505                         iefrm_t += 6;
 506                         prep->prep_origseq = LE_READ_4(iefrm_t); iefrm_t += 4;
 507
 508                         hwmp_recv_prep(vap, ni, wh, prep);
 509                         free(prep, M_80211_MESH_PREP);
 510                         found++;
 511                         break;
 512                 }
 513                 case IEEE80211_ELEMID_MESHPERR:
 514                 {
 515                         int i = 0;
 516
 517                         iefrm_t = iefrm;
 518                         ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
 519                         if (ndest < 0) {
 520                                 vap->iv_stats.is_rx_mgtdiscard++;
 521                                 break;
 522                         }
 523                         perr = malloc(sizeof(*perr) +
 524                             (ndest - 1) * sizeof(*perr->perr_dests),
 525                             M_80211_MESH_PERR, M_NOWAIT | M_ZERO);
 526                         KASSERT(perr != NULL, ("perr == NULL"));
 527
 528                         perr->perr_ie = *iefrm_t++;
 529                         perr->perr_len = *iefrm_t++;
 530                         perr->perr_ttl = *iefrm_t++;
 531                         perr->perr_ndests = *iefrm_t++;
 532
 533                         for (i = 0; i<perr->perr_ndests; i++) {
 534                                 perr->perr_dests[i].dest_flags = *iefrm_t++;
 535                                 IEEE80211_ADDR_COPY(
 536                                     perr->perr_dests[i].dest_addr, iefrm_t);
 537                                 iefrm_t += 6;
 538                                 perr->perr_dests[i].dest_seq = LE_READ_4(iefrm_t);
 539                                 iefrm_t += 4;
 540                                 /* NB: May have Target Proxied Address */
 541                                 if (perr->perr_dests[i].dest_flags &
 542                                     IEEE80211_MESHPERR_FLAGS_AE) {
 543                                         IEEE80211_ADDR_COPY(
 544                                             perr->perr_dests[i].dest_ext_addr,
 545                                             iefrm_t);
 546                                         iefrm_t += 6;
 547                                 }
 548                                 perr->perr_dests[i].dest_rcode =
 549                                     LE_READ_2(iefrm_t);
 550                                 iefrm_t += 2;
 551                         }
 552
 553                         hwmp_recv_perr(vap, ni, wh, perr);
 554                         free(perr, M_80211_MESH_PERR);
 555                         found++;
 556                         break;
 557                 }
 558                 case IEEE80211_ELEMID_MESHRANN:
 559                 {
 560                         const struct ieee80211_meshrann_ie *mrann =
 561                             (const struct ieee80211_meshrann_ie *) iefrm;
 562                         if (mrann->rann_len !=
 563                             sizeof(struct ieee80211_meshrann_ie) - 2) {
 564                                 IEEE80211_DISCARD(vap,
 565                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 566                                     wh, NULL, "%s", "RAN with wrong len");
 567                                     vap->iv_stats.is_rx_mgtdiscard++;
 568                                 return 1;
 569                         }
 570                         memcpy(&rann, mrann, sizeof(rann));
 571                         rann.rann_seq = LE_READ_4(&mrann->rann_seq);
 572                         rann.rann_interval = LE_READ_4(&mrann->rann_interval);
 573                         rann.rann_metric = LE_READ_4(&mrann->rann_metric);
 574                         hwmp_recv_rann(vap, ni, wh, &rann);
 575                         found++;
 576                         break;
 577                 }
 578                 }
 579                 iefrm += iefrm[1] + 2;
 580         }
 581         if (!found) {
 582                 IEEE80211_DISCARD(vap,
 583                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
 584                     wh, NULL, "%s", "PATH SEL action without IE");
 585                 vap->iv_stats.is_rx_mgtdiscard++;
 586         }
 587         return 0;
 588 }
 589
 590 static int
 591 hwmp_send_action(struct ieee80211_node *ni,
 592     const uint8_t sa[IEEE80211_ADDR_LEN],
 593     const uint8_t da[IEEE80211_ADDR_LEN],
 594     uint8_t *ie, size_t len)
 595 {
 596         struct ieee80211vap *vap = ni->ni_vap;
 597         struct ieee80211com *ic = ni->ni_ic;
 598         struct ieee80211_bpf_params params;
 599         struct mbuf *m;
 600         uint8_t *frm;
 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         /*
 611          * Hold a reference on the node so it doesn't go away until after
 612          * the xmit is complete all the way in the driver.  On error we
 613          * will remove our reference.
 614          */
 615 #ifdef IEEE80211_DEBUG_REFCNT
 616         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 617             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 618             __func__, __LINE__,
 619             ni, ether_sprintf(ni->ni_macaddr),
 620             ieee80211_node_refcnt(ni)+1);
 621 #endif
 622         ieee80211_ref_node(ni);
 623
 624         m = ieee80211_getmgtframe(&frm,
 625             ic->ic_headroom + sizeof(struct ieee80211_frame),
 626             sizeof(struct ieee80211_action) + len
 627         );
 628         if (m == NULL) {
 629                 ieee80211_free_node(ni);
 630                 vap->iv_stats.is_tx_nobuf++;
 631                 return ENOMEM;
 632         }
 633         *frm++ = IEEE80211_ACTION_CAT_MESH;
 634         *frm++ = IEEE80211_ACTION_MESH_HWMP;
 635         switch (*ie) {
 636         case IEEE80211_ELEMID_MESHPREQ:
 637                 frm = hwmp_add_meshpreq(frm,
 638                     (struct ieee80211_meshpreq_ie *)ie);
 639                 break;
 640         case IEEE80211_ELEMID_MESHPREP:
 641                 frm = hwmp_add_meshprep(frm,
 642                     (struct ieee80211_meshprep_ie *)ie);
 643                 break;
 644         case IEEE80211_ELEMID_MESHPERR:
 645                 frm = hwmp_add_meshperr(frm,
 646                     (struct ieee80211_meshperr_ie *)ie);
 647                 break;
 648         case IEEE80211_ELEMID_MESHRANN:
 649                 frm = hwmp_add_meshrann(frm,
 650                     (struct ieee80211_meshrann_ie *)ie);
 651                 break;
 652         }
 653
 654         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 655         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
 656         if (m == NULL) {
 657                 ieee80211_free_node(ni);
 658                 vap->iv_stats.is_tx_nobuf++;
 659                 return ENOMEM;
 660         }
 661         ieee80211_send_setup(ni, m,
 662             IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
 663             IEEE80211_NONQOS_TID, sa, da, sa);
 664
 665         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 666         IEEE80211_NODE_STAT(ni, tx_mgmt);
 667
 668         memset(&params, 0, sizeof(params));
 669         params.ibp_pri = WME_AC_VO;
 670         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 671         if (IEEE80211_IS_MULTICAST(da))
 672                 params.ibp_try0 = 1;
 673         else
 674                 params.ibp_try0 = ni->ni_txparms->maxretry;
 675         params.ibp_power = ni->ni_txpower;
 676         return ic->ic_raw_xmit(ni, m, &params);
 677 }
 678
 679 #define ADDSHORT(frm, v) do {           \
 680         frm[0] = (v) & 0xff;            \
 681         frm[1] = (v) >> 8;              \
 682         frm += 2;                       \
 683 } while (0)
 684 #define ADDWORD(frm, v) do {            \
 685         LE_WRITE_4(frm, v);             \
 686         frm += 4;                       \
 687 } while (0)
 688 /*
 689  * Add a Mesh Path Request IE to a frame.
 690  */
 691 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
 692 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
 693 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
 694 static uint8_t *
 695 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
 696 {
 697         int i;
 698
 699         *frm++ = IEEE80211_ELEMID_MESHPREQ;
 700         *frm++ = preq->preq_len;        /* len already calculated */
 701         *frm++ = preq->preq_flags;
 702         *frm++ = preq->preq_hopcount;
 703         *frm++ = preq->preq_ttl;
 704         ADDWORD(frm, preq->preq_id);
 705         IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
 706         ADDWORD(frm, preq->preq_origseq);
 707         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
 708                 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
 709                 frm += 6;
 710         }
 711         ADDWORD(frm, preq->preq_lifetime);
 712         ADDWORD(frm, preq->preq_metric);
 713         *frm++ = preq->preq_tcount;
 714         for (i = 0; i < preq->preq_tcount; i++) {
 715                 *frm++ = PREQ_TFLAGS(i);
 716                 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
 717                 frm += 6;
 718                 ADDWORD(frm, PREQ_TSEQ(i));
 719         }
 720         return frm;
 721 }
 722 #undef  PREQ_TFLAGS
 723 #undef  PREQ_TADDR
 724 #undef  PREQ_TSEQ
 725
 726 /*
 727  * Add a Mesh Path Reply IE to a frame.
 728  */
 729 static uint8_t *
 730 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
 731 {
 732         *frm++ = IEEE80211_ELEMID_MESHPREP;
 733         *frm++ = prep->prep_len;        /* len already calculated */
 734         *frm++ = prep->prep_flags;
 735         *frm++ = prep->prep_hopcount;
 736         *frm++ = prep->prep_ttl;
 737         IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
 738         ADDWORD(frm, prep->prep_targetseq);
 739         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
 740                 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
 741                 frm += 6;
 742         }
 743         ADDWORD(frm, prep->prep_lifetime);
 744         ADDWORD(frm, prep->prep_metric);
 745         IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
 746         ADDWORD(frm, prep->prep_origseq);
 747         return frm;
 748 }
 749
 750 /*
 751  * Add a Mesh Path Error IE to a frame.
 752  */
 753 #define PERR_DFLAGS(n)  perr->perr_dests[n].dest_flags
 754 #define PERR_DADDR(n)   perr->perr_dests[n].dest_addr
 755 #define PERR_DSEQ(n)    perr->perr_dests[n].dest_seq
 756 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
 757 #define PERR_DRCODE(n)  perr->perr_dests[n].dest_rcode
 758 static uint8_t *
 759 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
 760 {
 761         int i;
 762
 763         *frm++ = IEEE80211_ELEMID_MESHPERR;
 764         *frm++ = perr->perr_len;        /* len already calculated */
 765         *frm++ = perr->perr_ttl;
 766         *frm++ = perr->perr_ndests;
 767         for (i = 0; i < perr->perr_ndests; i++) {
 768                 *frm++ = PERR_DFLAGS(i);
 769                 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
 770                 frm += 6;
 771                 ADDWORD(frm, PERR_DSEQ(i));
 772                 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
 773                         IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
 774                         frm += 6;
 775                 }
 776                 ADDSHORT(frm, PERR_DRCODE(i));
 777         }
 778         return frm;
 779 }
 780 #undef  PERR_DFLAGS
 781 #undef  PERR_DADDR
 782 #undef  PERR_DSEQ
 783 #undef  PERR_EXTADDR
 784 #undef  PERR_DRCODE
 785
 786 /*
 787  * Add a Root Annoucement IE to a frame.
 788  */
 789 static uint8_t *
 790 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
 791 {
 792         *frm++ = IEEE80211_ELEMID_MESHRANN;
 793         *frm++ = rann->rann_len;
 794         *frm++ = rann->rann_flags;
 795         *frm++ = rann->rann_hopcount;
 796         *frm++ = rann->rann_ttl;
 797         IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
 798         ADDWORD(frm, rann->rann_seq);
 799         ADDWORD(frm, rann->rann_interval);
 800         ADDWORD(frm, rann->rann_metric);
 801         return frm;
 802 }
 803
 804 static void
 805 hwmp_rootmode_setup(struct ieee80211vap *vap)
 806 {
 807         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 808
 809         switch (hs->hs_rootmode) {
 810         case IEEE80211_HWMP_ROOTMODE_DISABLED:
 811                 callout_drain(&hs->hs_roottimer);
 812                 break;
 813         case IEEE80211_HWMP_ROOTMODE_NORMAL:
 814         case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
 815                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
 816                     hwmp_rootmode_cb, vap);
 817                 break;
 818         case IEEE80211_HWMP_ROOTMODE_RANN:
 819                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
 820                     hwmp_rootmode_rann_cb, vap);
 821                 break;
 822         }
 823 }
 824
 825 /*
 826  * Send a broadcast Path Request to find all nodes on the mesh. We are
 827  * called when the vap is configured as a HWMP root node.
 828  */
 829 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
 830 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
 831 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
 832 static void
 833 hwmp_rootmode_cb(void *arg)
 834 {
 835         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 836         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 837         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 838         struct ieee80211_meshpreq_ie preq;
 839
 840         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 841             "%s", "send broadcast PREQ");
 842
 843         preq.preq_flags = 0;
 844         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
 845                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
 846         if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
 847                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
 848         preq.preq_hopcount = 0;
 849         preq.preq_ttl = ms->ms_ttl;
 850         preq.preq_id = ++hs->hs_preqid;
 851         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 852         preq.preq_origseq = ++hs->hs_seq;
 853         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
 854         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 855         preq.preq_tcount = 1;
 856         IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
 857         PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
 858             IEEE80211_MESHPREQ_TFLAGS_USN;
 859         PREQ_TSEQ(0) = 0;
 860         vap->iv_stats.is_hwmp_rootreqs++;
 861         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq,
 862             NULL, NULL);        /* NB: we enforce rate check ourself */
 863         hwmp_rootmode_setup(vap);
 864 }
 865 #undef  PREQ_TFLAGS
 866 #undef  PREQ_TADDR
 867 #undef  PREQ_TSEQ
 868
 869 /*
 870  * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
 871  * called when the vap is configured as a HWMP RANN root node.
 872  */
 873 static void
 874 hwmp_rootmode_rann_cb(void *arg)
 875 {
 876         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
 877         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 878         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 879         struct ieee80211_meshrann_ie rann;
 880
 881         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
 882             "%s", "send broadcast RANN");
 883
 884         rann.rann_flags = 0;
 885         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
 886                 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
 887         rann.rann_hopcount = 0;
 888         rann.rann_ttl = ms->ms_ttl;
 889         IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
 890         rann.rann_seq = ++hs->hs_seq;
 891         rann.rann_interval = ieee80211_hwmp_rannint;
 892         rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 893
 894         vap->iv_stats.is_hwmp_rootrann++;
 895         hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann);
 896         hwmp_rootmode_setup(vap);
 897 }
 898
 899 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
 900 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
 901 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
 902 static void
 903 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
 904     const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
 905 {
 906         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 907         struct ieee80211_mesh_route *rtorig = NULL;
 908         struct ieee80211_mesh_route *rtorig_ext = NULL;
 909         struct ieee80211_mesh_route *rttarg = NULL;
 910         struct ieee80211_hwmp_route *hrorig = NULL;
 911         struct ieee80211_hwmp_route *hrtarg = NULL;
 912         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 913         struct ieee80211_meshprep_ie prep;
 914         ieee80211_hwmp_seq preqid;      /* last seen preqid for orig */
 915         uint32_t metric = 0;
 916
 917         if (ni == vap->iv_bss ||
 918             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
 919                 return;
 920         /*
 921          * Ignore PREQs from us. Could happen because someone forward it
 922          * back to us.
 923          */
 924         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
 925                 return;
 926
 927         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 928             "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
 929             PREQ_TADDR(0), ":");
 930
 931         /*
 932          * Acceptance criteria: (if the PREQ is not for us or not broadcast,
 933          * or an external mac address not proxied by us),
 934          * AND forwarding is disabled, discard this PREQ.
 935          */
 936         rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
 937         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
 938             (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
 939             !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
 940             (rttarg != NULL &&
 941             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
 942             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
 943                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 944                     preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
 945                 return;
 946         }
 947         /*
 948          * Acceptance criteria: if unicast addressed
 949          * AND no valid forwarding for Target of PREQ, discard this PREQ.
 950          */
 951         if(rttarg != NULL)
 952                 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
 953                     struct ieee80211_hwmp_route);
 954         /* Address mode: ucast */
 955         if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
 956             rttarg == NULL &&
 957             !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
 958                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 959                     preq->preq_origaddr, NULL,
 960                     "unicast addressed PREQ of unknown target %6D",
 961                     PREQ_TADDR(0), ":");
 962                 return;
 963         }
 964
 965         /* PREQ ACCEPTED */
 966
 967         rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
 968         if (rtorig == NULL) {
 969                 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
 970                 if (rtorig == NULL) {
 971                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 972                             "unable to add orig path to %6D",
 973                             preq->preq_origaddr, ":");
 974                         vap->iv_stats.is_mesh_rtaddfailed++;
 975                         return;
 976                 }
 977                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 978                     "adding originator %6D", preq->preq_origaddr, ":");
 979         }
 980         hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
 981
 982         /* record last seen preqid */
 983         preqid = hrorig->hr_preqid;
 984         hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
 985
 986         /* Data creation and update of forwarding information
 987          * according to Table 11C-8 for originator mesh STA.
 988          */
 989         metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
 990         if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
 991             (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
 992             metric < rtorig->rt_metric)) {
 993                 hrorig->hr_seq = preq->preq_origseq;
 994                 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
 995                 rtorig->rt_metric = metric;
 996                 rtorig->rt_nhops  = preq->preq_hopcount + 1;
 997                 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
 998                 /* path to orig is valid now */
 999                 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
1000         }else if ((hrtarg != NULL &&
1001             HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0)) &&
1002             ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)) ||
1003             preqid >= preq->preq_id) {
1004                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1005                     "discard PREQ from %6D, old seqno %u <= %u,"
1006                     " or old preqid %u < %u",
1007                     preq->preq_origaddr, ":",
1008                     preq->preq_origseq, hrorig->hr_seq,
1009                     preq->preq_id, preqid);
1010                 return;
1011         }
1012
1013         /*
1014          * Forwarding information for transmitter mesh STA
1015          * [OPTIONAL: if metric improved]
1016          */
1017
1018         /*
1019          * Check if the PREQ is addressed to us.
1020          * or a Proxy currently supplied by us.
1021          */
1022         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1023             (rttarg != NULL &&
1024             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1025             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1026                 /*
1027                  * When we are the target we shall update our own HWMP seq
1028                  * number with max of (current and preq->seq) + 1
1029                  */
1030                 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
1031
1032                 prep.prep_flags = 0;
1033                 prep.prep_hopcount = 0;
1034                 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
1035                 if (rttarg != NULL && /* if NULL it means we are the target */
1036                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1037                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1038                             "reply for proxy %6D", rttarg->rt_dest, ":");
1039                         prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
1040                         IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
1041                             rttarg->rt_dest);
1042                         /* update proxy seqno to HWMP seqno */
1043                         rttarg->rt_ext_seq = hs->hs_seq;
1044                         prep.prep_hopcount = rttarg->rt_nhops;
1045                         IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
1046                 }
1047                 /*
1048                  * Build and send a PREP frame.
1049                  */
1050                 prep.prep_ttl = ms->ms_ttl;
1051                 prep.prep_targetseq = hs->hs_seq;
1052                 prep.prep_lifetime = preq->preq_lifetime;
1053                 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1054                 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
1055                 prep.prep_origseq = preq->preq_origseq;
1056
1057                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1058                     "reply to %6D", preq->preq_origaddr, ":");
1059                 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep);
1060                 return;
1061         }
1062         /* we may update our proxy information for the orig external */
1063         else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
1064                 rtorig_ext =
1065                     ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
1066                 if (rtorig_ext == NULL) {
1067                         rtorig_ext = ieee80211_mesh_rt_add(vap,
1068                             preq->preq_orig_ext_addr);
1069                         if (rtorig_ext == NULL) {
1070                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1071                                     "unable to add orig ext proxy to %6D",
1072                                     preq->preq_orig_ext_addr, ":");
1073                                 vap->iv_stats.is_mesh_rtaddfailed++;
1074                                 return;
1075                         }
1076                         IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
1077                             preq->preq_origaddr);
1078                 }
1079                 rtorig_ext->rt_ext_seq = preq->preq_origseq;
1080                 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
1081         }
1082         /*
1083          * Proactive PREQ: reply with a proactive PREP to the
1084          * root STA if requested.
1085          */
1086         if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
1087             (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
1088                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1089                     "root mesh station @ %6D", preq->preq_origaddr, ":");
1090
1091                 /*
1092                  * Reply with a PREP if we don't have a path to the root
1093                  * or if the root sent us a proactive PREQ.
1094                  */
1095                 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1096                     (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
1097                         prep.prep_flags = 0;
1098                         prep.prep_hopcount = 0;
1099                         prep.prep_ttl = ms->ms_ttl;
1100                         IEEE80211_ADDR_COPY(prep.prep_origaddr,
1101                             preq->preq_origaddr);
1102                         prep.prep_origseq = preq->preq_origseq;
1103                         prep.prep_lifetime = preq->preq_lifetime;
1104                         prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1105                         IEEE80211_ADDR_COPY(prep.prep_targetaddr,
1106                             vap->iv_myaddr);
1107                         prep.prep_targetseq = ++hs->hs_seq;
1108                         hwmp_send_prep(vap->iv_bss, vap->iv_myaddr,
1109                             rtorig->rt_nexthop, &prep);
1110                 }
1111         }
1112
1113         /*
1114          * Forwarding and Intermediate reply for PREQs with 1 target.
1115          */
1116         if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
1117             (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1118                 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
1119
1120                 memcpy(&ppreq, preq, sizeof(ppreq));
1121
1122                 /*
1123                  * We have a valid route to this node.
1124                  */
1125                 if (rttarg != NULL &&
1126                     (rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1127                         /*
1128                          * Check if we can send an intermediate Path Reply,
1129                          * i.e., Target Only bit is not set and target is not
1130                          * the MAC broadcast address.
1131                          */
1132                         if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
1133                             !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
1134                                 struct ieee80211_meshprep_ie prep;
1135
1136                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1137                                     "intermediate reply for PREQ from %6D",
1138                                     preq->preq_origaddr, ":");
1139                                 prep.prep_flags = 0;
1140                                 prep.prep_hopcount = rttarg->rt_nhops;
1141                                 prep.prep_ttl = ms->ms_ttl;
1142                                 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
1143                                     PREQ_TADDR(0));
1144                                 prep.prep_targetseq = hrtarg->hr_seq;
1145                                 prep.prep_lifetime = preq->preq_lifetime;
1146                                 prep.prep_metric =rttarg->rt_metric;
1147                                 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
1148                                     preq->preq_origaddr);
1149                                 prep.prep_origseq = hrorig->hr_seq;
1150                                 hwmp_send_prep(ni, vap->iv_myaddr,
1151                                     rtorig->rt_nexthop, &prep);
1152
1153                                 /*
1154                                  * Set TO and unset RF bits because we have
1155                                  * sent a PREP.
1156                                  */
1157                                 ppreq.preq_targets[0].target_flags |=
1158                                     IEEE80211_MESHPREQ_TFLAGS_TO;
1159                         }
1160                 }
1161
1162                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1163                     "forward PREQ from %6D",
1164                     preq->preq_origaddr, ":");
1165                 ppreq.preq_hopcount += 1;
1166                 ppreq.preq_ttl -= 1;
1167                 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
1168
1169                 /* don't do PREQ ratecheck when we propagate */
1170                 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr,
1171                         &ppreq, NULL, NULL);
1172         }
1173 }
1174 #undef  PREQ_TFLAGS
1175 #undef  PREQ_TADDR
1176 #undef  PREQ_TSEQ
1177
1178 static int
1179 hwmp_send_preq(struct ieee80211_node *ni,
1180     const uint8_t sa[IEEE80211_ADDR_LEN],
1181     const uint8_t da[IEEE80211_ADDR_LEN],
1182     struct ieee80211_meshpreq_ie *preq,
1183     struct timeval *last, struct timeval *minint)
1184 {
1185
1186         /*
1187          * Enforce PREQ interval.
1188          * NB: Proactive ROOT PREQs rate is handled by cb task.
1189          */
1190         if (last != NULL && minint != NULL) {
1191                 if (ratecheck(last, minint) == 0)
1192                         return EALREADY; /* XXX: we should postpone */
1193                 getmicrouptime(last);
1194         }
1195
1196         /*
1197          * mesh preq action frame format
1198          *     [6] da
1199          *     [6] sa
1200          *     [6] addr3 = sa
1201          *     [1] action
1202          *     [1] category
1203          *     [tlv] mesh path request
1204          */
1205         preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
1206         preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
1207             IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
1208             preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
1209         return hwmp_send_action(ni, sa, da, (uint8_t *)preq, preq->preq_len+2);
1210 }
1211
1212 static void
1213 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
1214     const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
1215 {
1216 #define IS_PROXY(rt)    (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
1217 #define PROXIED_BY_US(rt)               \
1218     (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
1219         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1220         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1221         struct ieee80211_mesh_route *rt = NULL;
1222         struct ieee80211_mesh_route *rtorig = NULL;
1223         struct ieee80211_mesh_route *rtext = NULL;
1224         struct ieee80211_hwmp_route *hr;
1225         struct ieee80211com *ic = vap->iv_ic;
1226         struct ifnet *ifp = vap->iv_ifp;
1227         struct mbuf *m, *next;
1228         uint32_t metric = 0;
1229         const uint8_t *addr;
1230
1231         if (ni == vap->iv_bss ||
1232             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
1233                 return;
1234
1235         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1236             "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
1237             prep->prep_targetaddr, ":");
1238
1239         /*
1240          * Acceptance criteria: (If the corresponding PREP was not generated
1241          * by us OR not generated by an external mac that is not proxied by us)
1242          * AND forwarding is disabled, discard this PREP.
1243          */
1244         rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
1245         if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
1246             (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
1247             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
1248                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1249                     "discard PREP, orig(%6D) not proxied or generated by us",
1250                     prep->prep_origaddr, ":");
1251                 return;
1252         }
1253
1254         /* PREP ACCEPTED */
1255
1256         /*
1257          * If accepted shall create or update the active forwarding information
1258          * it maintains for the target mesh STA of the PREP (according to the
1259          * rules defined in 13.10.8.4). If the conditions for creating or
1260          * updating the forwarding information have not been met in those
1261          * rules, no further steps are applied to the PREP.
1262          * [OPTIONAL]: update forwarding information to TA if metric improves.
1263          */
1264         rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
1265         if (rt == NULL) {
1266                 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
1267                 if (rt == NULL) {
1268                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1269                             "unable to add PREP path to %6D",
1270                             prep->prep_targetaddr, ":");
1271                         vap->iv_stats.is_mesh_rtaddfailed++;
1272                         return;
1273                 }
1274                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1275                     "adding target %6D", prep->prep_targetaddr, ":");
1276         }
1277         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1278         /* update path metric */
1279         metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
1280         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1281                 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
1282                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1283                             "discard PREP from %6D, old seq no %u < %u",
1284                             prep->prep_targetaddr, ":",
1285                             prep->prep_targetseq, hr->hr_seq);
1286                         return;
1287                 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
1288                     metric > rt->rt_metric) {
1289                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1290                             "discard PREP from %6D, new metric %u > %u",
1291                             prep->prep_targetaddr, ":",
1292                             metric, rt->rt_metric);
1293                         return;
1294                 }
1295         }
1296
1297         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1298             "%s path to %6D, hopcount %d:%d metric %d:%d",
1299             rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1300             "prefer" : "update",
1301             prep->prep_targetaddr, ":",
1302             rt->rt_nhops, prep->prep_hopcount + 1,
1303             rt->rt_metric, metric);
1304
1305         hr->hr_seq = prep->prep_targetseq;
1306         hr->hr_preqretries = 0;
1307         IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
1308         rt->rt_metric = metric;
1309         rt->rt_nhops = prep->prep_hopcount + 1;
1310         ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
1311         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1312                 /* discovery complete */
1313                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
1314         }
1315         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
1316
1317         /*
1318          * If it's NOT for us, propagate the PREP
1319          */
1320         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1321             prep->prep_ttl > 1 &&
1322             prep->prep_hopcount < hs->hs_maxhops) {
1323                 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1324                 /*
1325                  * NB: We should already have setup the path to orig
1326                  * mesh STA when we propagated PREQ to target mesh STA,
1327                  * no PREP is generated without a corresponding PREQ.
1328                  * XXX: for now just ignore.
1329                  */
1330                 if (rtorig == NULL) {
1331                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1332                             "received PREP for an unknown orig(%6D)",
1333                             prep->prep_origaddr, ":");
1334                         return;
1335                 }
1336
1337                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1338                     "propagate PREP from %6D",
1339                     prep->prep_targetaddr, ":");
1340
1341                 memcpy(&pprep, prep, sizeof(pprep));
1342                 pprep.prep_hopcount += 1;
1343                 pprep.prep_ttl -= 1;
1344                 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1345                 hwmp_send_prep(ni, vap->iv_myaddr, rtorig->rt_nexthop, &pprep);
1346
1347                 /* precursor list for the Target Mesh STA Address is updated */
1348         }
1349
1350         /*
1351          * Check if we received a PREP w/ AE and store target external address.
1352          * We may store target external address if recevied PREP w/ AE
1353          * and we are not final destination
1354          */
1355         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
1356                 rtext = ieee80211_mesh_rt_find(vap,
1357                         prep->prep_target_ext_addr);
1358                 if (rtext == NULL) {
1359                         rtext = ieee80211_mesh_rt_add(vap,
1360                                 prep->prep_target_ext_addr);
1361                         if (rtext == NULL) {
1362                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1363                                     "unable to add PREP path to proxy %6D",
1364                                     prep->prep_targetaddr, ":");
1365                                 vap->iv_stats.is_mesh_rtaddfailed++;
1366                                 return;
1367                         }
1368                 }
1369                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1370                     "%s path to %6D, hopcount %d:%d metric %d:%d",
1371                     rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1372                     "prefer" : "update",
1373                     prep->prep_target_ext_addr, ":",
1374                     rtext->rt_nhops, prep->prep_hopcount + 1,
1375                     rtext->rt_metric, metric);
1376
1377                 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
1378                         IEEE80211_MESHRT_FLAGS_VALID;
1379                 IEEE80211_ADDR_COPY(rtext->rt_dest,
1380                     prep->prep_target_ext_addr);
1381                 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
1382                     prep->prep_targetaddr);
1383                 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
1384                 rtext->rt_metric = metric;
1385                 rtext->rt_lifetime = prep->prep_lifetime;
1386                 rtext->rt_nhops = prep->prep_hopcount + 1;
1387                 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
1388                 /*
1389                  * XXX: proxy entries have no HWMP priv data,
1390                  * nullify them to be sure?
1391                  */
1392         }
1393         /*
1394          * Check for frames queued awaiting path discovery.
1395          * XXX probably can tell exactly and avoid remove call
1396          * NB: hash may have false matches, if so they will get
1397          *     stuck back on the stageq because there won't be
1398          *     a path.
1399          */
1400         addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1401             prep->prep_target_ext_addr : prep->prep_targetaddr;
1402         m = ieee80211_ageq_remove(&ic->ic_stageq,
1403             (struct ieee80211_node *)(uintptr_t)
1404             ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
1405         for (; m != NULL; m = next) {
1406                 next = m->m_nextpkt;
1407                 m->m_nextpkt = NULL;
1408                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1409                     "flush queued frame %p len %d", m, m->m_pkthdr.len);
1410                 ifp->if_transmit(ifp, m);
1411         }
1412 #undef  IS_PROXY
1413 #undef  PROXIED_BY_US
1414 }
1415
1416 static int
1417 hwmp_send_prep(struct ieee80211_node *ni,
1418     const uint8_t sa[IEEE80211_ADDR_LEN],
1419     const uint8_t da[IEEE80211_ADDR_LEN],
1420     struct ieee80211_meshprep_ie *prep)
1421 {
1422         /* NB: there's no PREP minimum interval. */
1423
1424         /*
1425          * mesh prep action frame format
1426          *     [6] da
1427          *     [6] sa
1428          *     [6] addr3 = sa
1429          *     [1] action
1430          *     [1] category
1431          *     [tlv] mesh path reply
1432          */
1433         prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1434         prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1435             IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
1436         return hwmp_send_action(ni, sa, da, (uint8_t *)prep,
1437             prep->prep_len + 2);
1438 }
1439
1440 #define PERR_DFLAGS(n)  perr.perr_dests[n].dest_flags
1441 #define PERR_DADDR(n)   perr.perr_dests[n].dest_addr
1442 #define PERR_DSEQ(n)    perr.perr_dests[n].dest_seq
1443 #define PERR_DRCODE(n)  perr.perr_dests[n].dest_rcode
1444 static void
1445 hwmp_peerdown(struct ieee80211_node *ni)
1446 {
1447         struct ieee80211vap *vap = ni->ni_vap;
1448         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1449         struct ieee80211_meshperr_ie perr;
1450         struct ieee80211_mesh_route *rt;
1451         struct ieee80211_hwmp_route *hr;
1452
1453         rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1454         if (rt == NULL)
1455                 return;
1456         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1457         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1458             "%s", "delete route entry");
1459         perr.perr_ttl = ms->ms_ttl;
1460         perr.perr_ndests = 1;
1461         PERR_DFLAGS(0) = 0;
1462         if (hr->hr_seq == 0)
1463                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1464         PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1465         IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1466         PERR_DSEQ(0) = ++hr->hr_seq;
1467         PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1468         /* NB: flush everything passing through peer */
1469         ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1470         hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr);
1471 }
1472 #undef  PERR_DFLAGS
1473 #undef  PERR_DADDR
1474 #undef  PERR_DSEQ
1475 #undef  PERR_DRCODE
1476
1477 #define PERR_DFLAGS(n)          perr->perr_dests[n].dest_flags
1478 #define PERR_DADDR(n)           perr->perr_dests[n].dest_addr
1479 #define PERR_DSEQ(n)            perr->perr_dests[n].dest_seq
1480 #define PERR_DEXTADDR(n)        perr->perr_dests[n].dest_ext_addr
1481 #define PERR_DRCODE(n)          perr->perr_dests[n].dest_rcode
1482 static void
1483 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1484     const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1485 {
1486         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1487         struct ieee80211_mesh_route *rt = NULL;
1488         struct ieee80211_mesh_route *rt_ext = NULL;
1489         struct ieee80211_hwmp_route *hr;
1490         struct ieee80211_meshperr_ie *pperr = NULL;
1491         int i, j = 0, forward = 0;
1492
1493         if (ni == vap->iv_bss ||
1494             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
1495                 return;
1496
1497         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1498             "received PERR from %6D", wh->i_addr2, ":");
1499
1500         /*
1501          * if forwarding is true, prepare pperr
1502          */
1503         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1504                 forward = 1;
1505                 pperr = malloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1506                     M_80211_MESH_PERR, M_NOWAIT); /* XXX: magic number, 32 err dests */
1507         }
1508
1509         /*
1510          * Acceptance criteria: check if we have forwarding information
1511          * stored about destination, and that nexthop == TA of this PERR.
1512          * NB: we also build a new PERR to propagate in case we should forward.
1513          */
1514         for (i = 0; i < perr->perr_ndests; i++) {
1515                 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1516                 if (rt == NULL || rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1517                         continue;
1518                 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
1519                         continue;
1520
1521                 /* found and accepted a PERR ndest element, process it... */
1522                 if (forward)
1523                         memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
1524                             sizeof(*perr->perr_dests));
1525                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1526                 switch(PERR_DFLAGS(i)) {
1527                 case (IEEE80211_REASON_MESH_PERR_NO_FI):
1528                         if (PERR_DSEQ(i) == 0) {
1529                                 hr->hr_seq++;
1530                                 if (forward) {
1531                                         pperr->perr_dests[j].dest_seq =
1532                                             hr->hr_seq;
1533                                 }
1534                         } else {
1535                                 hr->hr_seq = PERR_DSEQ(i);
1536                         }
1537                         rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1538                         j++;
1539                         break;
1540                 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
1541                         if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
1542                                 hr->hr_seq = PERR_DSEQ(i);
1543                                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1544                                 j++;
1545                         }
1546                         break;
1547                 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
1548                         rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
1549                         if (rt_ext != NULL) {
1550                                 rt_ext->rt_flags &=
1551                                     ~IEEE80211_MESHRT_FLAGS_VALID;
1552                                 j++;
1553                         }
1554                         break;
1555                 default:
1556                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1557                             "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
1558                         goto done; /* XXX: stats?? */
1559                 }
1560                 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest);
1561                 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
1562         }
1563         if (j == 0) {
1564                 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
1565                     "PERR not accepted");
1566                 goto done; /* XXX: stats?? */
1567         }
1568
1569         /*
1570          * Propagate the PERR if we previously found it on our routing table.
1571          */
1572         if (forward && perr->perr_ttl > 1) {
1573                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1574                     "propagate PERR from %6D", wh->i_addr2, ":");
1575                 pperr->perr_ndests = j;
1576                 pperr->perr_ttl--;
1577                 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
1578                     pperr);
1579         }
1580 done:
1581         if (pperr != NULL)
1582                 free(pperr, M_80211_MESH_PERR);
1583 }
1584 #undef  PERR_DFLAGS
1585 #undef  PERR_DADDR
1586 #undef  PERR_DSEQ
1587 #undef  PERR_DEXTADDR
1588 #undef  PERR_DRCODE
1589
1590 static int
1591 hwmp_send_perr(struct ieee80211_node *ni,
1592     const uint8_t sa[IEEE80211_ADDR_LEN],
1593     const uint8_t da[IEEE80211_ADDR_LEN],
1594     struct ieee80211_meshperr_ie *perr)
1595 {
1596         struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
1597         int i;
1598         uint8_t length = 0;
1599
1600         /*
1601          * Enforce PERR interval.
1602          */
1603         if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1604                 return EALREADY;
1605         getmicrouptime(&hs->hs_lastperr);
1606
1607         /*
1608          * mesh perr action frame format
1609          *     [6] da
1610          *     [6] sa
1611          *     [6] addr3 = sa
1612          *     [1] action
1613          *     [1] category
1614          *     [tlv] mesh path error
1615          */
1616         perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1617         length = IEEE80211_MESHPERR_BASE_SZ;
1618         for (i = 0; i<perr->perr_ndests; i++) {
1619                 if (perr->perr_dests[i].dest_flags &
1620                     IEEE80211_MESHPERR_FLAGS_AE) {
1621                         length += IEEE80211_MESHPERR_DEST_SZ_AE;
1622                         continue ;
1623                 }
1624                 length += IEEE80211_MESHPERR_DEST_SZ;
1625         }
1626         perr->perr_len =length;
1627         return hwmp_send_action(ni, sa, da, (uint8_t *)perr, perr->perr_len+2);
1628 }
1629
1630 /*
1631  * Called from the rest of the net80211 code (mesh code for example).
1632  * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
1633  * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
1634  */
1635 #define PERR_DFLAGS(n)          perr.perr_dests[n].dest_flags
1636 #define PERR_DADDR(n)           perr.perr_dests[n].dest_addr
1637 #define PERR_DSEQ(n)            perr.perr_dests[n].dest_seq
1638 #define PERR_DEXTADDR(n)        perr.perr_dests[n].dest_ext_addr
1639 #define PERR_DRCODE(n)          perr.perr_dests[n].dest_rcode
1640 static void
1641 hwmp_senderror(struct ieee80211vap *vap,
1642     const uint8_t addr[IEEE80211_ADDR_LEN],
1643     struct ieee80211_mesh_route *rt, int rcode)
1644 {
1645         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1646         struct ieee80211_hwmp_route *hr = NULL;
1647         struct ieee80211_meshperr_ie perr;
1648
1649         if (rt != NULL)
1650                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1651                     struct ieee80211_hwmp_route);
1652
1653         perr.perr_ndests = 1;
1654         perr.perr_ttl = ms->ms_ttl;
1655         PERR_DFLAGS(0) = 0;
1656         PERR_DRCODE(0) = rcode;
1657
1658         switch (rcode) {
1659         case IEEE80211_REASON_MESH_PERR_NO_FI:
1660                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1661                 PERR_DSEQ(0) = 0; /* reserved */
1662                 break;
1663         case IEEE80211_REASON_MESH_PERR_NO_PROXY:
1664                 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
1665                 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
1666                     ("route is not marked proxy"));
1667                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
1668                 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
1669                 PERR_DSEQ(0) = rt->rt_ext_seq;
1670                 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
1671                 break;
1672         case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
1673                 KASSERT(rt != NULL, ("no route info for sending PERR"));
1674                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1675                 PERR_DSEQ(0) = hr->hr_seq;
1676                 break;
1677         default:
1678                 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
1679         }
1680         hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr);
1681 }
1682 #undef  PERR_DFLAGS
1683 #undef  PEER_DADDR
1684 #undef  PERR_DSEQ
1685 #undef  PERR_DEXTADDR
1686 #undef  PERR_DRCODE
1687
1688 static void
1689 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1690     const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1691 {
1692         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1693         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1694         struct ieee80211_mesh_route *rt = NULL;
1695         struct ieee80211_hwmp_route *hr;
1696         struct ieee80211_meshpreq_ie preq;
1697         struct ieee80211_meshrann_ie prann;
1698         uint32_t metric = 0;
1699
1700         if (ni == vap->iv_bss ||
1701             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1702             IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1703                 return;
1704
1705         rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1706         if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
1707                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1708
1709                 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
1710                 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
1711                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1712                         "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
1713                         return;
1714                 }
1715
1716                 /* Acceptance criteria: if RANN.seq == stored seq AND
1717                 * RANN.metric > stored metric, discard RANN */
1718                 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
1719                 rann->rann_metric > rt->rt_metric) {
1720                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1721                         "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
1722                         return;
1723                 }
1724         }
1725
1726         /* RANN ACCEPTED */
1727
1728         ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
1729         metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni);
1730
1731         if (rt == NULL) {
1732                 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
1733                 if (rt == NULL) {
1734                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1735                             "unable to add mac for RANN root %6D",
1736                             rann->rann_addr, ":");
1737                             vap->iv_stats.is_mesh_rtaddfailed++;
1738                         return;
1739                 }
1740         }
1741         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1742         /* discovery timeout */
1743         ieee80211_mesh_rt_update(rt,
1744             ticks_to_msecs(ieee80211_hwmp_roottimeout));
1745
1746         preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
1747         preq.preq_hopcount = 0;
1748         preq.preq_ttl = ms->ms_ttl;
1749         preq.preq_id = 0; /* reserved */
1750         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1751         preq.preq_origseq = ++hs->hs_seq;
1752         preq.preq_lifetime = ieee80211_hwmp_roottimeout;
1753         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1754         preq.preq_tcount = 1;
1755         preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
1756         /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
1757         IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
1758         preq.preq_targets[0].target_seq = rann->rann_seq;
1759         /* XXX: if rootconfint have not passed, we built this preq in vain */
1760         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, wh->i_addr2, &preq,
1761             &hr->hr_lastrootconf, &ieee80211_hwmp_rootconfint);
1762
1763         /* propagate a RANN */
1764         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1765             rann->rann_ttl > 1 &&
1766             ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1767                 hr->hr_seq = rann->rann_seq;
1768                 memcpy(&prann, rann, sizeof(prann));
1769                 prann.rann_hopcount += 1;
1770                 prann.rann_ttl -= 1;
1771                 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1772                 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr,
1773                     broadcastaddr, &prann);
1774         }
1775 }
1776
1777 static int
1778 hwmp_send_rann(struct ieee80211_node *ni,
1779     const uint8_t sa[IEEE80211_ADDR_LEN],
1780     const uint8_t da[IEEE80211_ADDR_LEN],
1781     struct ieee80211_meshrann_ie *rann)
1782 {
1783         /*
1784          * mesh rann action frame format
1785          *     [6] da
1786          *     [6] sa
1787          *     [6] addr3 = sa
1788          *     [1] action
1789          *     [1] category
1790          *     [tlv] root annoucement
1791          */
1792         rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1793         rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
1794         return hwmp_send_action(ni, sa, da, (uint8_t *)rann,
1795             rann->rann_len + 2);
1796 }
1797
1798 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
1799 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
1800 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
1801 static void
1802 hwmp_rediscover_cb(void *arg)
1803 {
1804         struct ieee80211_mesh_route *rt = arg;
1805         struct ieee80211vap *vap = rt->rt_vap;
1806         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1807         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1808         struct ieee80211_hwmp_route *hr;
1809         struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
1810
1811         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
1812                 return ; /* nothing to do */
1813
1814         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1815         if (hr->hr_preqretries >=
1816                 ieee80211_hwmp_maxpreq_retries) {
1817                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1818                         rt->rt_dest, NULL, "%s",
1819                         "no valid path , max number of discovery, send GATE");
1820                 /* TODO: send to known gates */
1821                 vap->iv_stats.is_mesh_fwd_nopath++;
1822                 rt->rt_flags = 0; /* Mark invalid */
1823                 return ; /* XXX: flush queue? */
1824         }
1825
1826         hr->hr_preqretries++;
1827
1828
1829         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
1830             "start path rediscovery , target seq %u", hr->hr_seq);
1831         /*
1832          * Try to discover the path for this node.
1833          * Group addressed PREQ Case A
1834          */
1835         preq.preq_flags = 0;
1836         preq.preq_hopcount = 0;
1837         preq.preq_ttl = ms->ms_ttl;
1838         preq.preq_id = ++hs->hs_preqid;
1839         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1840         preq.preq_origseq = hr->hr_origseq;
1841         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1842         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1843         preq.preq_tcount = 1;
1844         IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
1845         PREQ_TFLAGS(0) = 0;
1846         if (ieee80211_hwmp_targetonly)
1847                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1848         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1849         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1850         /* XXX check return value */
1851         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
1852                 broadcastaddr, &preq, &hr->hr_lastpreq,
1853                 &ieee80211_hwmp_preqminint);
1854         callout_reset(&rt->rt_discovery,
1855                 ieee80211_hwmp_net_diameter_traversaltime * 2,
1856                 hwmp_rediscover_cb, rt);
1857 }
1858
1859 static struct ieee80211_node *
1860 hwmp_discover(struct ieee80211vap *vap,
1861     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1862 {
1863         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1864         struct ieee80211_mesh_state *ms = vap->iv_mesh;
1865         struct ieee80211_mesh_route *rt = NULL;
1866         struct ieee80211_hwmp_route *hr;
1867         struct ieee80211_meshpreq_ie preq;
1868         struct ieee80211_node *ni;
1869         int sendpreq = 0;
1870
1871         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1872             ("not a mesh vap, opmode %d", vap->iv_opmode));
1873
1874         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1875             ("%s: discovering self!", __func__));
1876
1877         ni = NULL;
1878         if (!IEEE80211_IS_MULTICAST(dest)) {
1879                 rt = ieee80211_mesh_rt_find(vap, dest);
1880                 if (rt == NULL) {
1881                         rt = ieee80211_mesh_rt_add(vap, dest);
1882                         if (rt == NULL) {
1883                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1884                                     ni, "unable to add discovery path to %6D",
1885                                     dest, ":");
1886                                 vap->iv_stats.is_mesh_rtaddfailed++;
1887                                 goto done;
1888                         }
1889                 }
1890                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1891                     struct ieee80211_hwmp_route);
1892                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1893                         if (hr->hr_lastdiscovery != 0 &&
1894                             (ticks - hr->hr_lastdiscovery <
1895                             (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
1896                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1897                                     dest, NULL, "%s",
1898                                     "too frequent discovery requeust");
1899                                 /* XXX: stats? */
1900                                 goto done;
1901                         }
1902                         hr->hr_lastdiscovery = ticks;
1903                         if (hr->hr_preqretries >=
1904                             ieee80211_hwmp_maxpreq_retries) {
1905                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1906                                     dest, NULL, "%s",
1907                                     "no valid path , max number of discovery");
1908                                 vap->iv_stats.is_mesh_fwd_nopath++;
1909                                 goto done;
1910                         }
1911                         rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
1912                         hr->hr_preqretries++;
1913                         if (hr->hr_origseq == 0)
1914                                 hr->hr_origseq = ++hs->hs_seq;
1915                         rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1916                         sendpreq = 1;
1917                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1918                             "start path discovery (src %s), target seq %u",
1919                             m == NULL ? "<none>" : ether_sprintf(
1920                             mtod(m, struct ether_header *)->ether_shost),
1921                             hr->hr_seq);
1922                         /*
1923                          * Try to discover the path for this node.
1924                          * Group addressed PREQ Case A
1925                          */
1926                         preq.preq_flags = 0;
1927                         preq.preq_hopcount = 0;
1928                         preq.preq_ttl = ms->ms_ttl;
1929                         preq.preq_id = ++hs->hs_preqid;
1930                         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1931                         preq.preq_origseq = hr->hr_origseq;
1932                         preq.preq_lifetime =
1933                             ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1934                         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1935                         preq.preq_tcount = 1;
1936                         IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1937                         PREQ_TFLAGS(0) = 0;
1938                         if (ieee80211_hwmp_targetonly)
1939                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1940                         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1941                         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1942                         /* XXX check return value */
1943                         hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
1944                             broadcastaddr, &preq, &hr->hr_lastpreq,
1945                             &ieee80211_hwmp_preqminint);
1946                         callout_reset(&rt->rt_discovery,
1947                             ieee80211_hwmp_net_diameter_traversaltime * 2,
1948                             hwmp_rediscover_cb, rt);
1949                 }
1950                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1951                         ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
1952         } else {
1953                 ni = ieee80211_find_txnode(vap, dest);
1954                 /* NB: if null then we leak mbuf */
1955                 KASSERT(ni != NULL, ("leak mcast frame"));
1956                 return ni;
1957         }
1958 done:
1959         if (ni == NULL && m != NULL) {
1960                 if (sendpreq) {
1961                         struct ieee80211com *ic = vap->iv_ic;
1962                         /*
1963                          * Queue packet for transmit when path discovery
1964                          * completes.  If discovery never completes the
1965                          * frame will be flushed by way of the aging timer.
1966                          */
1967                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1968                             "%s", "queue frame until path found");
1969                         m->m_pkthdr.rcvif = (void *)(uintptr_t)
1970                             ieee80211_mac_hash(ic, dest);
1971                         /* XXX age chosen randomly */
1972                         ieee80211_ageq_append(&ic->ic_stageq, m,
1973                             IEEE80211_INACT_WAIT);
1974                 } else {
1975                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1976                             dest, NULL, "%s", "no valid path to this node");
1977                         m_freem(m);
1978                 }
1979         }
1980         return ni;
1981 }
1982 #undef  PREQ_TFLAGS
1983 #undef  PREQ_TADDR
1984 #undef  PREQ_TSEQ
1985
1986 static int
1987 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1988 {
1989         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1990         int error;
1991
1992         if (vap->iv_opmode != IEEE80211_M_MBSS)
1993                 return ENOSYS;
1994         error = 0;
1995         switch (ireq->i_type) {
1996         case IEEE80211_IOC_HWMP_ROOTMODE:
1997                 ireq->i_val = hs->hs_rootmode;
1998                 break;
1999         case IEEE80211_IOC_HWMP_MAXHOPS:
2000                 ireq->i_val = hs->hs_maxhops;
2001                 break;
2002         default:
2003                 return ENOSYS;
2004         }
2005         return error;
2006 }
2007 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
2008
2009 static int
2010 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2011 {
2012         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2013         int error;
2014
2015         if (vap->iv_opmode != IEEE80211_M_MBSS)
2016                 return ENOSYS;
2017         error = 0;
2018         switch (ireq->i_type) {
2019         case IEEE80211_IOC_HWMP_ROOTMODE:
2020                 if (ireq->i_val < 0 || ireq->i_val > 3)
2021                         return EINVAL;
2022                 hs->hs_rootmode = ireq->i_val;
2023                 hwmp_rootmode_setup(vap);
2024                 break;
2025         case IEEE80211_IOC_HWMP_MAXHOPS:
2026                 if (ireq->i_val <= 0 || ireq->i_val > 255)
2027                         return EINVAL;
2028                 hs->hs_maxhops = ireq->i_val;
2029                 break;
2030         default:
2031                 return ENOSYS;
2032         }
2033         return error;
2034 }
2035 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);