The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_hwmp.c

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    1 /*- 
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 The FreeBSD Foundation 
    5  * All rights reserved. 
    6  * 
    7  * This software was developed by Rui Paulo under sponsorship from the
    8  * FreeBSD Foundation. 
    9  *  
   10  * Redistribution and use in source and binary forms, with or without 
   11  * modification, are permitted provided that the following conditions 
   12  * are met: 
   13  * 1. Redistributions of source code must retain the above copyright 
   14  *    notice, this list of conditions and the following disclaimer. 
   15  * 2. Redistributions in binary form must reproduce the above copyright 
   16  *    notice, this list of conditions and the following disclaimer in the 
   17  *    documentation and/or other materials provided with the distribution. 
   18  * 
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
   29  * SUCH DAMAGE. 
   30  */ 
   31 #include <sys/cdefs.h>
   32 #ifdef __FreeBSD__
   33 __FBSDID("$FreeBSD: stable/12/sys/net80211/ieee80211_hwmp.c 337589 2018-08-10 20:37:32Z dteske $");
   34 #endif
   35 
   36 /*
   37  * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
   38  *
   39  * Based on March 2009, D3.0 802.11s draft spec.
   40  */
   41 #include "opt_inet.h"
   42 #include "opt_wlan.h"
   43 
   44 #include <sys/param.h>
   45 #include <sys/systm.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/malloc.h>
   48 #include <sys/kernel.h>
   49 
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 #include <sys/endian.h>
   53 #include <sys/errno.h>
   54 #include <sys/proc.h>
   55 #include <sys/sysctl.h>
   56 
   57 #include <net/if.h>
   58 #include <net/if_media.h>
   59 #include <net/if_llc.h>
   60 #include <net/ethernet.h>
   61 
   62 #include <net/bpf.h>
   63 
   64 #include <net80211/ieee80211_var.h>
   65 #include <net80211/ieee80211_action.h>
   66 #include <net80211/ieee80211_input.h>
   67 #include <net80211/ieee80211_mesh.h>
   68 
   69 static void     hwmp_vattach(struct ieee80211vap *);
   70 static void     hwmp_vdetach(struct ieee80211vap *);
   71 static int      hwmp_newstate(struct ieee80211vap *,
   72                     enum ieee80211_state, int);
   73 static int      hwmp_send_action(struct ieee80211vap *,
   74                     const uint8_t [IEEE80211_ADDR_LEN],
   75                     uint8_t *, size_t);
   76 static uint8_t * hwmp_add_meshpreq(uint8_t *,
   77                     const struct ieee80211_meshpreq_ie *);
   78 static uint8_t * hwmp_add_meshprep(uint8_t *,
   79                     const struct ieee80211_meshprep_ie *);
   80 static uint8_t * hwmp_add_meshperr(uint8_t *,
   81                     const struct ieee80211_meshperr_ie *);
   82 static uint8_t * hwmp_add_meshrann(uint8_t *,
   83                     const struct ieee80211_meshrann_ie *);
   84 static void     hwmp_rootmode_setup(struct ieee80211vap *);
   85 static void     hwmp_rootmode_cb(void *);
   86 static void     hwmp_rootmode_rann_cb(void *);
   87 static void     hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
   88                     const struct ieee80211_frame *,
   89                     const struct ieee80211_meshpreq_ie *);
   90 static int      hwmp_send_preq(struct ieee80211vap *,
   91                     const uint8_t [IEEE80211_ADDR_LEN],
   92                     struct ieee80211_meshpreq_ie *,
   93                     struct timeval *, struct timeval *);
   94 static void     hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
   95                     const struct ieee80211_frame *,
   96                     const struct ieee80211_meshprep_ie *);
   97 static int      hwmp_send_prep(struct ieee80211vap *,
   98                     const uint8_t [IEEE80211_ADDR_LEN],
   99                     struct ieee80211_meshprep_ie *);
  100 static void     hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
  101                     const struct ieee80211_frame *,
  102                     const struct ieee80211_meshperr_ie *);
  103 static int      hwmp_send_perr(struct ieee80211vap *,
  104                     const uint8_t [IEEE80211_ADDR_LEN],
  105                     struct ieee80211_meshperr_ie *);
  106 static void     hwmp_senderror(struct ieee80211vap *,
  107                     const uint8_t [IEEE80211_ADDR_LEN],
  108                     struct ieee80211_mesh_route *, int);
  109 static void     hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
  110                    const struct ieee80211_frame *,
  111                    const struct ieee80211_meshrann_ie *);
  112 static int      hwmp_send_rann(struct ieee80211vap *,
  113                     const uint8_t [IEEE80211_ADDR_LEN],
  114                     struct ieee80211_meshrann_ie *);
  115 static struct ieee80211_node *
  116                 hwmp_discover(struct ieee80211vap *,
  117                     const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
  118 static void     hwmp_peerdown(struct ieee80211_node *);
  119 
  120 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
  121 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
  122 
  123 
  124 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
  125 static const uint8_t    broadcastaddr[IEEE80211_ADDR_LEN] =
  126         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  127 
  128 typedef uint32_t ieee80211_hwmp_seq;
  129 #define HWMP_SEQ_LT(a, b)       ((int32_t)((a)-(b)) < 0)
  130 #define HWMP_SEQ_LEQ(a, b)      ((int32_t)((a)-(b)) <= 0)
  131 #define HWMP_SEQ_EQ(a, b)       ((int32_t)((a)-(b)) == 0)
  132 #define HWMP_SEQ_GT(a, b)       ((int32_t)((a)-(b)) > 0)
  133 
  134 #define HWMP_SEQ_MAX(a, b)      (a > b ? a : b)
  135 
  136 /*
  137  * Private extension of ieee80211_mesh_route.
  138  */
  139 struct ieee80211_hwmp_route {
  140         ieee80211_hwmp_seq      hr_seq;         /* last HWMP seq seen from dst*/
  141         ieee80211_hwmp_seq      hr_preqid;      /* last PREQ ID seen from dst */
  142         ieee80211_hwmp_seq      hr_origseq;     /* seq. no. on our latest PREQ*/
  143         struct timeval          hr_lastpreq;    /* last time we sent a PREQ */
  144         struct timeval          hr_lastrootconf; /* last sent PREQ root conf */
  145         int                     hr_preqretries; /* number of discoveries */
  146         int                     hr_lastdiscovery; /* last discovery in ticks */
  147 };
  148 struct ieee80211_hwmp_state {
  149         ieee80211_hwmp_seq      hs_seq;         /* next seq to be used */
  150         ieee80211_hwmp_seq      hs_preqid;      /* next PREQ ID to be used */
  151         int                     hs_rootmode;    /* proactive HWMP */
  152         struct timeval          hs_lastperr;    /* last time we sent a PERR */
  153         struct callout          hs_roottimer;
  154         uint8_t                 hs_maxhops;     /* max hop count */
  155 };
  156 
  157 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
  158     "IEEE 802.11s HWMP parameters");
  159 static int      ieee80211_hwmp_targetonly = 0;
  160 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
  161     &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
  162 static int      ieee80211_hwmp_pathtimeout = -1;
  163 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
  164     &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  165     "path entry lifetime (ms)");
  166 static int      ieee80211_hwmp_maxpreq_retries = -1;
  167 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW,
  168     &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
  169     "maximum number of preq retries");
  170 static int      ieee80211_hwmp_net_diameter_traversaltime = -1;
  171 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
  172     CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0,
  173     ieee80211_sysctl_msecs_ticks, "I",
  174     "estimate travelse time across the MBSS (ms)");
  175 static int      ieee80211_hwmp_roottimeout = -1;
  176 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
  177     &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  178     "root PREQ timeout (ms)");
  179 static int      ieee80211_hwmp_rootint = -1;
  180 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
  181     &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
  182     "root interval (ms)");
  183 static int      ieee80211_hwmp_rannint = -1;
  184 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
  185     &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
  186     "root announcement interval (ms)");
  187 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
  188 static int      ieee80211_hwmp_rootconfint_internal = -1;
  189 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD,
  190     &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
  191     "root confirmation interval (ms) (read-only)");
  192 
  193 #define IEEE80211_HWMP_DEFAULT_MAXHOPS  31
  194 
  195 static  ieee80211_recv_action_func hwmp_recv_action_meshpath;
  196 
  197 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
  198         .mpp_descr      = "HWMP",
  199         .mpp_ie         = IEEE80211_MESHCONF_PATH_HWMP,
  200         .mpp_discover   = hwmp_discover,
  201         .mpp_peerdown   = hwmp_peerdown,
  202         .mpp_senderror  = hwmp_senderror,
  203         .mpp_vattach    = hwmp_vattach,
  204         .mpp_vdetach    = hwmp_vdetach,
  205         .mpp_newstate   = hwmp_newstate,
  206         .mpp_privlen    = sizeof(struct ieee80211_hwmp_route),
  207 };
  208 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
  209         &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
  210         "mesh route inactivity timeout (ms)");
  211 
  212 
  213 static void
  214 ieee80211_hwmp_init(void)
  215 {
  216         /* Default values as per amendment */
  217         ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
  218         ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
  219         ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
  220         ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
  221         ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
  222         ieee80211_hwmp_maxpreq_retries = 3;
  223         /*
  224          * (TU): A measurement of time equal to 1024 μs,
  225          * 500 TU is 512 ms.
  226          */
  227         ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
  228 
  229         /*
  230          * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
  231          * and return a struct timeval...
  232          */
  233         ieee80211_hwmp_rootconfint.tv_usec =
  234             ieee80211_hwmp_rootconfint_internal * 1000;
  235 
  236         /*
  237          * Register action frame handler.
  238          */
  239         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
  240             IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
  241 
  242         /* NB: default is 5 secs per spec */
  243         mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
  244 
  245         /*
  246          * Register HWMP.
  247          */
  248         ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
  249 }
  250 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
  251 
  252 static void
  253 hwmp_vattach(struct ieee80211vap *vap)
  254 {
  255         struct ieee80211_hwmp_state *hs;
  256 
  257         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
  258             ("not a mesh vap, opmode %d", vap->iv_opmode));
  259 
  260         hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
  261             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  262         if (hs == NULL) {
  263                 printf("%s: couldn't alloc HWMP state\n", __func__);
  264                 return;
  265         }
  266         hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
  267         callout_init(&hs->hs_roottimer, 1);
  268         vap->iv_hwmp = hs;
  269 }
  270 
  271 static void
  272 hwmp_vdetach(struct ieee80211vap *vap)
  273 {
  274         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  275 
  276         callout_drain(&hs->hs_roottimer);
  277         IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
  278         vap->iv_hwmp = NULL;
  279 } 
  280 
  281 static int
  282 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
  283 {
  284         enum ieee80211_state nstate = vap->iv_state;
  285         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  286 
  287         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  288             __func__, ieee80211_state_name[ostate],
  289             ieee80211_state_name[nstate], arg);
  290 
  291         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
  292                 callout_drain(&hs->hs_roottimer);
  293         if (nstate == IEEE80211_S_RUN)
  294                 hwmp_rootmode_setup(vap);
  295         return 0;
  296 }
  297 
  298 /*
  299  * Verify the length of an HWMP PREQ and return the number
  300  * of destinations >= 1, if verification fails -1 is returned.
  301  */
  302 static int
  303 verify_mesh_preq_len(struct ieee80211vap *vap,
  304     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  305 {
  306         int alloc_sz = -1;
  307         int ndest = -1;
  308         if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
  309                 /* Originator External Address  present */
  310                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ_AE;
  311                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
  312         } else {
  313                 /* w/o Originator External Address */
  314                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ;
  315                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
  316         }
  317         alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
  318 
  319         if(iefrm[1] != (alloc_sz)) {
  320                 IEEE80211_DISCARD(vap,
  321                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  322                     wh, NULL, "PREQ (AE=%s) with wrong len",
  323                     iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "");
  324                 return (-1);
  325         }
  326         return ndest;
  327 }
  328 
  329 /*
  330  * Verify the length of an HWMP PREP and returns 1 on success,
  331  * otherwise -1.
  332  */
  333 static int
  334 verify_mesh_prep_len(struct ieee80211vap *vap,
  335     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  336 {
  337         int alloc_sz = -1;
  338         if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
  339                 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
  340                         alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
  341         } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
  342                 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
  343         if(alloc_sz < 0) {
  344                 IEEE80211_DISCARD(vap,
  345                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  346                     wh, NULL, "PREP (AE=%s) with wrong len",
  347                     iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "");
  348                 return (-1);
  349         }
  350         return (1);
  351 }
  352 
  353 /*
  354  * Verify the length of an HWMP PERR and return the number
  355  * of destinations >= 1, if verification fails -1 is returned.
  356  */
  357 static int
  358 verify_mesh_perr_len(struct ieee80211vap *vap,
  359     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  360 {
  361         int alloc_sz = -1;
  362         const uint8_t *iefrm_t = iefrm;
  363         uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
  364         int i;
  365 
  366         if(ndest > IEEE80211_MESHPERR_MAXDEST) {
  367                 IEEE80211_DISCARD(vap,
  368                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  369                     wh, NULL, "PERR with wrong number of destionat (>19), %u",
  370                     ndest);
  371                 return (-1);
  372         }
  373 
  374         iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
  375         /* We need to check each destionation flag to know size */
  376         for(i = 0; i<ndest; i++) {
  377                 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
  378                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
  379                 else
  380                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
  381         }
  382 
  383         alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
  384         if(alloc_sz !=  iefrm[1]) {
  385                 IEEE80211_DISCARD(vap,
  386                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  387                     wh, NULL, "%s", "PERR with wrong len");
  388                 return (-1);
  389         }
  390         return ndest;
  391 }
  392 
  393 static int
  394 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
  395         const struct ieee80211_frame *wh,
  396         const uint8_t *frm, const uint8_t *efrm)
  397 {
  398         struct ieee80211vap *vap = ni->ni_vap;
  399         struct ieee80211_meshpreq_ie *preq;
  400         struct ieee80211_meshprep_ie *prep;
  401         struct ieee80211_meshperr_ie *perr;
  402         struct ieee80211_meshrann_ie rann;
  403         const uint8_t *iefrm = frm + 2; /* action + code */
  404         const uint8_t *iefrm_t = iefrm; /* temporary pointer */
  405         int ndest = -1;
  406         int found = 0;
  407 
  408         while (efrm - iefrm > 1) {
  409                 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
  410                 switch (*iefrm) {
  411                 case IEEE80211_ELEMID_MESHPREQ:
  412                 {
  413                         int i = 0;
  414 
  415                         iefrm_t = iefrm;
  416                         ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
  417                         if (ndest < 0) {
  418                                 vap->iv_stats.is_rx_mgtdiscard++;
  419                                 break;
  420                         }
  421                         preq = IEEE80211_MALLOC(sizeof(*preq) +
  422                             (ndest - 1) * sizeof(*preq->preq_targets),
  423                             M_80211_MESH_PREQ,
  424                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  425                         KASSERT(preq != NULL, ("preq == NULL"));
  426 
  427                         preq->preq_ie = *iefrm_t++;
  428                         preq->preq_len = *iefrm_t++;
  429                         preq->preq_flags = *iefrm_t++;
  430                         preq->preq_hopcount = *iefrm_t++;
  431                         preq->preq_ttl = *iefrm_t++;
  432                         preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
  433                         IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
  434                         iefrm_t += 6;
  435                         preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
  436                         /* NB: may have Originator Proxied Address */
  437                         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE)  {
  438                                 IEEE80211_ADDR_COPY(
  439                                     preq->preq_orig_ext_addr, iefrm_t);
  440                                 iefrm_t += 6;
  441                         }
  442                         preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
  443                         preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
  444                         preq->preq_tcount = *iefrm_t++;
  445                         
  446                         for (i = 0; i < preq->preq_tcount; i++) {
  447                                 preq->preq_targets[i].target_flags = *iefrm_t++;
  448                                 IEEE80211_ADDR_COPY(
  449                                     preq->preq_targets[i].target_addr, iefrm_t);
  450                                 iefrm_t += 6;
  451                                 preq->preq_targets[i].target_seq =
  452                                     le32dec(iefrm_t);
  453                                 iefrm_t += 4;
  454                         }
  455 
  456                         hwmp_recv_preq(vap, ni, wh, preq);
  457                         IEEE80211_FREE(preq, M_80211_MESH_PREQ);
  458                         found++;
  459                         break;
  460                 }
  461                 case IEEE80211_ELEMID_MESHPREP:
  462                 {
  463                         iefrm_t = iefrm;
  464                         ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
  465                         if (ndest < 0) {
  466                                 vap->iv_stats.is_rx_mgtdiscard++;
  467                                 break;
  468                         }
  469                         prep = IEEE80211_MALLOC(sizeof(*prep),
  470                             M_80211_MESH_PREP,
  471                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  472                         KASSERT(prep != NULL, ("prep == NULL"));
  473 
  474                         prep->prep_ie = *iefrm_t++;
  475                         prep->prep_len = *iefrm_t++;
  476                         prep->prep_flags = *iefrm_t++;
  477                         prep->prep_hopcount = *iefrm_t++;
  478                         prep->prep_ttl = *iefrm_t++;
  479                         IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
  480                         iefrm_t += 6;
  481                         prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
  482                         /* NB: May have Target Proxied Address */
  483                         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE)  {
  484                                 IEEE80211_ADDR_COPY(
  485                                     prep->prep_target_ext_addr, iefrm_t);
  486                                 iefrm_t += 6;
  487                         }
  488                         prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
  489                         prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
  490                         IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
  491                         iefrm_t += 6;
  492                         prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
  493 
  494                         hwmp_recv_prep(vap, ni, wh, prep);
  495                         IEEE80211_FREE(prep, M_80211_MESH_PREP);
  496                         found++;
  497                         break;
  498                 }
  499                 case IEEE80211_ELEMID_MESHPERR:
  500                 {
  501                         int i = 0;
  502 
  503                         iefrm_t = iefrm;
  504                         ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
  505                         if (ndest < 0) {
  506                                 vap->iv_stats.is_rx_mgtdiscard++;
  507                                 break;
  508                         }
  509                         perr = IEEE80211_MALLOC(sizeof(*perr) +
  510                             (ndest - 1) * sizeof(*perr->perr_dests),
  511                             M_80211_MESH_PERR,
  512                             IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  513                         KASSERT(perr != NULL, ("perr == NULL"));
  514 
  515                         perr->perr_ie = *iefrm_t++;
  516                         perr->perr_len = *iefrm_t++;
  517                         perr->perr_ttl = *iefrm_t++;
  518                         perr->perr_ndests = *iefrm_t++;
  519 
  520                         for (i = 0; i<perr->perr_ndests; i++) {
  521                                 perr->perr_dests[i].dest_flags = *iefrm_t++;
  522                                 IEEE80211_ADDR_COPY(
  523                                     perr->perr_dests[i].dest_addr, iefrm_t);
  524                                 iefrm_t += 6;
  525                                 perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
  526                                 iefrm_t += 4;
  527                                 /* NB: May have Target Proxied Address */
  528                                 if (perr->perr_dests[i].dest_flags &
  529                                     IEEE80211_MESHPERR_FLAGS_AE) {
  530                                         IEEE80211_ADDR_COPY(
  531                                             perr->perr_dests[i].dest_ext_addr,
  532                                             iefrm_t);
  533                                         iefrm_t += 6;
  534                                 }
  535                                 perr->perr_dests[i].dest_rcode =
  536                                     le16dec(iefrm_t);
  537                                 iefrm_t += 2;
  538                         }
  539 
  540                         hwmp_recv_perr(vap, ni, wh, perr);
  541                         IEEE80211_FREE(perr, M_80211_MESH_PERR);
  542                         found++;
  543                         break;
  544                 }
  545                 case IEEE80211_ELEMID_MESHRANN:
  546                 {
  547                         const struct ieee80211_meshrann_ie *mrann =
  548                             (const struct ieee80211_meshrann_ie *) iefrm;
  549                         if (mrann->rann_len !=
  550                             sizeof(struct ieee80211_meshrann_ie) - 2) {
  551                                 IEEE80211_DISCARD(vap,
  552                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  553                                     wh, NULL, "%s", "RAN with wrong len");
  554                                     vap->iv_stats.is_rx_mgtdiscard++;
  555                                 return 1;
  556                         }
  557                         memcpy(&rann, mrann, sizeof(rann));
  558                         rann.rann_seq = le32dec(&mrann->rann_seq);
  559                         rann.rann_interval = le32dec(&mrann->rann_interval);
  560                         rann.rann_metric = le32dec(&mrann->rann_metric);
  561                         hwmp_recv_rann(vap, ni, wh, &rann);
  562                         found++;
  563                         break;
  564                 }
  565                 }
  566                 iefrm += iefrm[1] + 2;
  567         }
  568         if (!found) {
  569                 IEEE80211_DISCARD(vap,
  570                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  571                     wh, NULL, "%s", "PATH SEL action without IE");
  572                 vap->iv_stats.is_rx_mgtdiscard++;
  573         }
  574         return 0;
  575 }
  576 
  577 static int
  578 hwmp_send_action(struct ieee80211vap *vap,
  579     const uint8_t da[IEEE80211_ADDR_LEN],
  580     uint8_t *ie, size_t len)
  581 {
  582         struct ieee80211_node *ni;
  583         struct ieee80211com *ic;
  584         struct ieee80211_bpf_params params;
  585         struct mbuf *m;
  586         uint8_t *frm;
  587         int ret;
  588 
  589         if (IEEE80211_IS_MULTICAST(da)) {
  590                 ni = ieee80211_ref_node(vap->iv_bss);
  591 #ifdef IEEE80211_DEBUG_REFCNT
  592                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
  593                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
  594                 __func__, __LINE__,
  595                 ni, ether_sprintf(ni->ni_macaddr),
  596                 ieee80211_node_refcnt(ni)+1);
  597 #endif
  598                 ieee80211_ref_node(ni);
  599         }
  600         else
  601                 ni = ieee80211_mesh_find_txnode(vap, da);
  602 
  603         if (vap->iv_state == IEEE80211_S_CAC) {
  604                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
  605                     "block %s frame in CAC state", "HWMP action");
  606                 vap->iv_stats.is_tx_badstate++;
  607                 return EIO;     /* XXX */
  608         }
  609 
  610         KASSERT(ni != NULL, ("null node"));
  611         ic = ni->ni_ic;
  612 
  613         m = ieee80211_getmgtframe(&frm,
  614             ic->ic_headroom + sizeof(struct ieee80211_frame),
  615             sizeof(struct ieee80211_action) + len
  616         );
  617         if (m == NULL) {
  618                 ieee80211_free_node(ni);
  619                 vap->iv_stats.is_tx_nobuf++;
  620                 return ENOMEM;
  621         }
  622         *frm++ = IEEE80211_ACTION_CAT_MESH;
  623         *frm++ = IEEE80211_ACTION_MESH_HWMP;
  624         switch (*ie) {
  625         case IEEE80211_ELEMID_MESHPREQ:
  626                 frm = hwmp_add_meshpreq(frm,
  627                     (struct ieee80211_meshpreq_ie *)ie);
  628                 break;
  629         case IEEE80211_ELEMID_MESHPREP:
  630                 frm = hwmp_add_meshprep(frm,
  631                     (struct ieee80211_meshprep_ie *)ie);
  632                 break;
  633         case IEEE80211_ELEMID_MESHPERR:
  634                 frm = hwmp_add_meshperr(frm,
  635                     (struct ieee80211_meshperr_ie *)ie);
  636                 break;
  637         case IEEE80211_ELEMID_MESHRANN:
  638                 frm = hwmp_add_meshrann(frm,
  639                     (struct ieee80211_meshrann_ie *)ie);
  640                 break;
  641         }
  642 
  643         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
  644         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
  645         if (m == NULL) {
  646                 ieee80211_free_node(ni);
  647                 vap->iv_stats.is_tx_nobuf++;
  648                 return ENOMEM;
  649         }
  650 
  651         IEEE80211_TX_LOCK(ic);
  652 
  653         ieee80211_send_setup(ni, m,
  654             IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
  655             IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
  656 
  657         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  658         IEEE80211_NODE_STAT(ni, tx_mgmt);
  659 
  660         memset(&params, 0, sizeof(params));
  661         params.ibp_pri = WME_AC_VO;
  662         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
  663         if (IEEE80211_IS_MULTICAST(da))
  664                 params.ibp_try0 = 1;
  665         else
  666                 params.ibp_try0 = ni->ni_txparms->maxretry;
  667         params.ibp_power = ni->ni_txpower;
  668         ret = ieee80211_raw_output(vap, ni, m, &params);
  669         IEEE80211_TX_UNLOCK(ic);
  670         return (ret);
  671 }
  672 
  673 #define ADDSHORT(frm, v) do {           \
  674         le16enc(frm, v);                \
  675         frm += 2;                       \
  676 } while (0)
  677 #define ADDWORD(frm, v) do {            \
  678         le32enc(frm, v);                \
  679         frm += 4;                       \
  680 } while (0)
  681 /*
  682  * Add a Mesh Path Request IE to a frame.
  683  */
  684 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
  685 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
  686 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
  687 static uint8_t *
  688 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
  689 {
  690         int i;
  691 
  692         *frm++ = IEEE80211_ELEMID_MESHPREQ;
  693         *frm++ = preq->preq_len;        /* len already calculated */
  694         *frm++ = preq->preq_flags;
  695         *frm++ = preq->preq_hopcount;
  696         *frm++ = preq->preq_ttl;
  697         ADDWORD(frm, preq->preq_id);
  698         IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
  699         ADDWORD(frm, preq->preq_origseq);
  700         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
  701                 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
  702                 frm += 6;
  703         }
  704         ADDWORD(frm, preq->preq_lifetime);
  705         ADDWORD(frm, preq->preq_metric);
  706         *frm++ = preq->preq_tcount;
  707         for (i = 0; i < preq->preq_tcount; i++) {
  708                 *frm++ = PREQ_TFLAGS(i);
  709                 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
  710                 frm += 6;
  711                 ADDWORD(frm, PREQ_TSEQ(i));
  712         }
  713         return frm;
  714 }
  715 #undef  PREQ_TFLAGS
  716 #undef  PREQ_TADDR
  717 #undef  PREQ_TSEQ
  718 
  719 /*
  720  * Add a Mesh Path Reply IE to a frame.
  721  */
  722 static uint8_t *
  723 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
  724 {
  725         *frm++ = IEEE80211_ELEMID_MESHPREP;
  726         *frm++ = prep->prep_len;        /* len already calculated */
  727         *frm++ = prep->prep_flags;
  728         *frm++ = prep->prep_hopcount;
  729         *frm++ = prep->prep_ttl;
  730         IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
  731         ADDWORD(frm, prep->prep_targetseq);
  732         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
  733                 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
  734                 frm += 6;
  735         }
  736         ADDWORD(frm, prep->prep_lifetime);
  737         ADDWORD(frm, prep->prep_metric);
  738         IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
  739         ADDWORD(frm, prep->prep_origseq);
  740         return frm;
  741 }
  742 
  743 /*
  744  * Add a Mesh Path Error IE to a frame.
  745  */
  746 #define PERR_DFLAGS(n)  perr->perr_dests[n].dest_flags
  747 #define PERR_DADDR(n)   perr->perr_dests[n].dest_addr
  748 #define PERR_DSEQ(n)    perr->perr_dests[n].dest_seq
  749 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
  750 #define PERR_DRCODE(n)  perr->perr_dests[n].dest_rcode
  751 static uint8_t *
  752 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
  753 {
  754         int i;
  755 
  756         *frm++ = IEEE80211_ELEMID_MESHPERR;
  757         *frm++ = perr->perr_len;        /* len already calculated */
  758         *frm++ = perr->perr_ttl;
  759         *frm++ = perr->perr_ndests;
  760         for (i = 0; i < perr->perr_ndests; i++) {
  761                 *frm++ = PERR_DFLAGS(i);
  762                 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
  763                 frm += 6;
  764                 ADDWORD(frm, PERR_DSEQ(i));
  765                 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
  766                         IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
  767                         frm += 6;
  768                 }
  769                 ADDSHORT(frm, PERR_DRCODE(i));
  770         }
  771         return frm;
  772 }
  773 #undef  PERR_DFLAGS
  774 #undef  PERR_DADDR
  775 #undef  PERR_DSEQ
  776 #undef  PERR_EXTADDR
  777 #undef  PERR_DRCODE
  778 
  779 /*
  780  * Add a Root Annoucement IE to a frame.
  781  */
  782 static uint8_t *
  783 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
  784 {
  785         *frm++ = IEEE80211_ELEMID_MESHRANN;
  786         *frm++ = rann->rann_len;
  787         *frm++ = rann->rann_flags;
  788         *frm++ = rann->rann_hopcount;
  789         *frm++ = rann->rann_ttl;
  790         IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
  791         ADDWORD(frm, rann->rann_seq);
  792         ADDWORD(frm, rann->rann_interval);
  793         ADDWORD(frm, rann->rann_metric);
  794         return frm;
  795 }
  796 
  797 static void
  798 hwmp_rootmode_setup(struct ieee80211vap *vap)
  799 {
  800         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  801         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  802 
  803         switch (hs->hs_rootmode) {
  804         case IEEE80211_HWMP_ROOTMODE_DISABLED:
  805                 callout_drain(&hs->hs_roottimer);
  806                 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
  807                 break;
  808         case IEEE80211_HWMP_ROOTMODE_NORMAL:
  809         case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
  810                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
  811                     hwmp_rootmode_cb, vap);
  812                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
  813                 break;
  814         case IEEE80211_HWMP_ROOTMODE_RANN:
  815                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
  816                     hwmp_rootmode_rann_cb, vap);
  817                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
  818                 break;
  819         }
  820 }
  821 
  822 /*
  823  * Send a broadcast Path Request to find all nodes on the mesh. We are
  824  * called when the vap is configured as a HWMP root node.
  825  */
  826 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
  827 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
  828 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
  829 static void
  830 hwmp_rootmode_cb(void *arg)
  831 {
  832         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
  833         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  834         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  835         struct ieee80211_meshpreq_ie preq;
  836 
  837         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
  838             "%s", "send broadcast PREQ");
  839 
  840         preq.preq_flags = 0;
  841         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
  842                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
  843         if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
  844                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
  845         preq.preq_hopcount = 0;
  846         preq.preq_ttl = ms->ms_ttl;
  847         preq.preq_id = ++hs->hs_preqid;
  848         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
  849         preq.preq_origseq = ++hs->hs_seq;
  850         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
  851         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
  852         preq.preq_tcount = 1;
  853         IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
  854         PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
  855             IEEE80211_MESHPREQ_TFLAGS_USN;
  856         PREQ_TSEQ(0) = 0;
  857         vap->iv_stats.is_hwmp_rootreqs++;
  858         /* NB: we enforce rate check ourself */
  859         hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
  860         hwmp_rootmode_setup(vap);
  861 }
  862 #undef  PREQ_TFLAGS
  863 #undef  PREQ_TADDR
  864 #undef  PREQ_TSEQ
  865 
  866 /*
  867  * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
  868  * called when the vap is configured as a HWMP RANN root node.
  869  */
  870 static void
  871 hwmp_rootmode_rann_cb(void *arg)
  872 {
  873         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
  874         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  875         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  876         struct ieee80211_meshrann_ie rann;
  877 
  878         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
  879             "%s", "send broadcast RANN");
  880 
  881         rann.rann_flags = 0;
  882         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
  883                 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
  884         rann.rann_hopcount = 0;
  885         rann.rann_ttl = ms->ms_ttl;
  886         IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
  887         rann.rann_seq = ++hs->hs_seq;
  888         rann.rann_interval = ieee80211_hwmp_rannint;
  889         rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
  890 
  891         vap->iv_stats.is_hwmp_rootrann++;
  892         hwmp_send_rann(vap, broadcastaddr, &rann);
  893         hwmp_rootmode_setup(vap);
  894 }
  895 
  896 /*
  897  * Update forwarding information to TA if metric improves.
  898  */
  899 static void
  900 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
  901     const char *hwmp_frame)
  902 {
  903         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  904         struct ieee80211_mesh_route *rttran = NULL;     /* Transmitter */
  905         int metric = 0;
  906 
  907         rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
  908         if (rttran == NULL) {
  909                 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
  910                 if (rttran == NULL) {
  911                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  912                             "unable to add path to transmitter %6D of %s",
  913                             ni->ni_macaddr, ":", hwmp_frame);
  914                         vap->iv_stats.is_mesh_rtaddfailed++;
  915                         return;
  916                 }
  917         }
  918         metric = ms->ms_pmetric->mpm_metric(ni);
  919         if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
  920             rttran->rt_metric > metric)
  921         {
  922                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  923                     "%s path to transmitter %6D of %s, metric %d:%d",
  924                     rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
  925                     "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
  926                     rttran->rt_metric, metric);
  927                 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
  928                 rttran->rt_metric = metric;
  929                 rttran->rt_nhops  = 1;
  930                 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
  931                 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
  932         }
  933 }
  934 
  935 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
  936 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
  937 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
  938 static void
  939 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
  940     const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
  941 {
  942         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  943         struct ieee80211_mesh_route *rtorig = NULL;
  944         struct ieee80211_mesh_route *rtorig_ext = NULL;
  945         struct ieee80211_mesh_route *rttarg = NULL;
  946         struct ieee80211_hwmp_route *hrorig = NULL;
  947         struct ieee80211_hwmp_route *hrtarg = NULL;
  948         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  949         ieee80211_hwmp_seq preqid;      /* last seen preqid for orig */
  950         uint32_t metric = 0;
  951 
  952         /*
  953          * Ignore PREQs from us. Could happen because someone forward it
  954          * back to us.
  955          */
  956         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
  957                 return;
  958 
  959         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  960             "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
  961             PREQ_TADDR(0), ":");
  962 
  963         /*
  964          * Acceptance criteria: (if the PREQ is not for us or not broadcast,
  965          * or an external mac address not proxied by us),
  966          * AND forwarding is disabled, discard this PREQ.
  967          */
  968         rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
  969         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
  970             (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
  971             !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
  972             (rttarg != NULL &&
  973             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
  974             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
  975                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
  976                     preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
  977                 return;
  978         }
  979         /*
  980          * Acceptance criteria: if unicast addressed 
  981          * AND no valid forwarding for Target of PREQ, discard this PREQ.
  982          */
  983         if(rttarg != NULL)
  984                 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
  985                     struct ieee80211_hwmp_route);
  986         /* Address mode: ucast */
  987         if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
  988             rttarg == NULL &&
  989             !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
  990                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
  991                     preq->preq_origaddr, NULL,
  992                     "unicast addressed PREQ of unknown target %6D",
  993                     PREQ_TADDR(0), ":");
  994                 return;
  995         }
  996 
  997         /* PREQ ACCEPTED */
  998 
  999         rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
 1000         if (rtorig == NULL) {
 1001                 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
 1002                 if (rtorig == NULL) {
 1003                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1004                             "unable to add orig path to %6D",
 1005                             preq->preq_origaddr, ":");
 1006                         vap->iv_stats.is_mesh_rtaddfailed++;
 1007                         return;
 1008                 }
 1009                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1010                     "adding originator %6D", preq->preq_origaddr, ":");
 1011         }
 1012         hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
 1013 
 1014         /* record last seen preqid */
 1015         preqid = hrorig->hr_preqid;
 1016         hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
 1017 
 1018         /* Data creation and update of forwarding information
 1019          * according to Table 11C-8 for originator mesh STA.
 1020          */
 1021         metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
 1022         if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
 1023             (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
 1024             metric < rtorig->rt_metric)) {
 1025                 hrorig->hr_seq = preq->preq_origseq;
 1026                 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
 1027                 rtorig->rt_metric = metric;
 1028                 rtorig->rt_nhops  = preq->preq_hopcount + 1;
 1029                 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
 1030                 /* Path to orig is valid now.
 1031                  * NB: we know it can't be Proxy, and if it is GATE
 1032                  * it will be marked below.
 1033                  */
 1034                 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
 1035         } else if ((hrtarg != NULL &&
 1036             !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
 1037             (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1038             preqid >= preq->preq_id)) {
 1039                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1040                     "discard PREQ from %6D, old seqno %u <= %u,"
 1041                     " or old preqid %u < %u",
 1042                     preq->preq_origaddr, ":",
 1043                     preq->preq_origseq, hrorig->hr_seq,
 1044                     preq->preq_id, preqid);
 1045                 return;
 1046         }
 1047 
 1048         /* Update forwarding information to TA if metric improves. */
 1049         hwmp_update_transmitter(vap, ni, "PREQ");
 1050 
 1051         /*
 1052          * Check if the PREQ is addressed to us.
 1053          * or a Proxy currently gated by us.
 1054          */
 1055         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
 1056             (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
 1057             rttarg != NULL &&
 1058             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
 1059             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
 1060             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
 1061                 struct ieee80211_meshprep_ie prep;
 1062 
 1063                 /*
 1064                  * When we are the target we shall update our own HWMP seq
 1065                  * number with max of (current and preq->seq) + 1
 1066                  */
 1067                 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
 1068 
 1069                 prep.prep_flags = 0;
 1070                 prep.prep_hopcount = 0;
 1071                 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1072                 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
 1073                 if (rttarg != NULL && /* if NULL it means we are the target */
 1074                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
 1075                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1076                             "reply for proxy %6D", rttarg->rt_dest, ":");
 1077                         prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
 1078                         IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
 1079                             rttarg->rt_dest);
 1080                         /* update proxy seqno to HWMP seqno */
 1081                         rttarg->rt_ext_seq = hs->hs_seq;
 1082                         prep.prep_hopcount = rttarg->rt_nhops;
 1083                         prep.prep_metric = rttarg->rt_metric;
 1084                         IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
 1085                 }
 1086                 /*
 1087                  * Build and send a PREP frame.
 1088                  */
 1089                 prep.prep_ttl = ms->ms_ttl;
 1090                 prep.prep_targetseq = hs->hs_seq;
 1091                 prep.prep_lifetime = preq->preq_lifetime;
 1092                 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
 1093                 prep.prep_origseq = preq->preq_origseq;
 1094 
 1095                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1096                     "reply to %6D", preq->preq_origaddr, ":");
 1097                 hwmp_send_prep(vap, wh->i_addr2, &prep);
 1098                 return;
 1099         }
 1100         /* we may update our proxy information for the orig external */
 1101         else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
 1102                 rtorig_ext =
 1103                     ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
 1104                 if (rtorig_ext == NULL) {
 1105                         rtorig_ext = ieee80211_mesh_rt_add(vap,
 1106                             preq->preq_orig_ext_addr);
 1107                         if (rtorig_ext == NULL) {
 1108                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1109                                     "unable to add orig ext proxy to %6D",
 1110                                     preq->preq_orig_ext_addr, ":");
 1111                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1112                                 return;
 1113                         }
 1114                         IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
 1115                             preq->preq_origaddr);
 1116                 }
 1117                 rtorig_ext->rt_ext_seq = preq->preq_origseq;
 1118                 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
 1119         }
 1120         /*
 1121          * Proactive PREQ: reply with a proactive PREP to the
 1122          * root STA if requested.
 1123          */
 1124         if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
 1125             (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
 1126                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1127                     "root mesh station @ %6D", preq->preq_origaddr, ":");
 1128 
 1129                 /* Check if root is a mesh gate, mark it */
 1130                 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
 1131                         struct ieee80211_mesh_gate_route *gr;
 1132 
 1133                         rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
 1134                         gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
 1135                             rtorig);
 1136                         gr->gr_lastseq = 0; /* NOT GANN */
 1137                 }
 1138 
 1139                 /*
 1140                  * Reply with a PREP if we don't have a path to the root
 1141                  * or if the root sent us a proactive PREQ.
 1142                  */
 1143                 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
 1144                     (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
 1145                         struct ieee80211_meshprep_ie prep;
 1146 
 1147                         prep.prep_flags = 0;
 1148                         prep.prep_hopcount = 0;
 1149                         prep.prep_ttl = ms->ms_ttl;
 1150                         IEEE80211_ADDR_COPY(prep.prep_origaddr,
 1151                             preq->preq_origaddr);
 1152                         prep.prep_origseq = preq->preq_origseq;
 1153                         prep.prep_lifetime = preq->preq_lifetime;
 1154                         prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1155                         IEEE80211_ADDR_COPY(prep.prep_targetaddr,
 1156                             vap->iv_myaddr);
 1157                         prep.prep_targetseq = ++hs->hs_seq;
 1158                         hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
 1159                 }
 1160         }
 1161 
 1162         /*
 1163          * Forwarding and Intermediate reply for PREQs with 1 target.
 1164          */
 1165         if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
 1166             (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
 1167                 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
 1168 
 1169                 memcpy(&ppreq, preq, sizeof(ppreq));
 1170 
 1171                 /*
 1172                  * We have a valid route to this node.
 1173                  * NB: if target is proxy dont reply.
 1174                  */
 1175                 if (rttarg != NULL &&
 1176                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1177                     !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
 1178                         /*
 1179                          * Check if we can send an intermediate Path Reply,
 1180                          * i.e., Target Only bit is not set and target is not
 1181                          * the MAC broadcast address.
 1182                          */
 1183                         if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
 1184                             !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
 1185                                 struct ieee80211_meshprep_ie prep;
 1186 
 1187                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1188                                     "intermediate reply for PREQ from %6D",
 1189                                     preq->preq_origaddr, ":");
 1190                                 prep.prep_flags = 0;
 1191                                 prep.prep_hopcount = rttarg->rt_nhops;
 1192                                 prep.prep_ttl = ms->ms_ttl;
 1193                                 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
 1194                                     PREQ_TADDR(0));
 1195                                 prep.prep_targetseq = hrtarg->hr_seq;
 1196                                 prep.prep_lifetime = preq->preq_lifetime;
 1197                                 prep.prep_metric =rttarg->rt_metric;
 1198                                 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
 1199                                     preq->preq_origaddr);
 1200                                 prep.prep_origseq = hrorig->hr_seq;
 1201                                 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
 1202 
 1203                                 /*
 1204                                  * Set TO and unset RF bits because we have
 1205                                  * sent a PREP.
 1206                                  */
 1207                                 ppreq.preq_targets[0].target_flags |=
 1208                                     IEEE80211_MESHPREQ_TFLAGS_TO;
 1209                         }
 1210                 }
 1211 
 1212                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1213                     "forward PREQ from %6D",
 1214                     preq->preq_origaddr, ":");
 1215                 ppreq.preq_hopcount += 1;
 1216                 ppreq.preq_ttl -= 1;
 1217                 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
 1218 
 1219                 /* don't do PREQ ratecheck when we propagate */
 1220                 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
 1221         }
 1222 }
 1223 #undef  PREQ_TFLAGS
 1224 #undef  PREQ_TADDR
 1225 #undef  PREQ_TSEQ
 1226 
 1227 static int
 1228 hwmp_send_preq(struct ieee80211vap *vap,
 1229     const uint8_t da[IEEE80211_ADDR_LEN],
 1230     struct ieee80211_meshpreq_ie *preq,
 1231     struct timeval *last, struct timeval *minint)
 1232 {
 1233 
 1234         /*
 1235          * Enforce PREQ interval.
 1236          * NB: Proactive ROOT PREQs rate is handled by cb task.
 1237          */
 1238         if (last != NULL && minint != NULL) {
 1239                 if (ratecheck(last, minint) == 0)
 1240                         return EALREADY; /* XXX: we should postpone */
 1241                 getmicrouptime(last);
 1242         }
 1243 
 1244         /*
 1245          * mesh preq action frame format
 1246          *     [6] da
 1247          *     [6] sa
 1248          *     [6] addr3 = sa
 1249          *     [1] action
 1250          *     [1] category
 1251          *     [tlv] mesh path request
 1252          */
 1253         preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
 1254         preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
 1255             IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
 1256             preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
 1257         return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
 1258 }
 1259 
 1260 static void
 1261 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1262     const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
 1263 {
 1264 #define IS_PROXY(rt)    (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
 1265 #define PROXIED_BY_US(rt)               \
 1266     (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
 1267         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1268         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1269         struct ieee80211_mesh_route *rt = NULL;
 1270         struct ieee80211_mesh_route *rtorig = NULL;
 1271         struct ieee80211_mesh_route *rtext = NULL;
 1272         struct ieee80211_hwmp_route *hr;
 1273         struct ieee80211com *ic = vap->iv_ic;
 1274         struct mbuf *m, *next;
 1275         uint32_t metric = 0;
 1276         const uint8_t *addr;
 1277 
 1278         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1279             "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
 1280             prep->prep_targetaddr, ":");
 1281 
 1282         /*
 1283          * Acceptance criteria: (If the corresponding PREP was not generated
 1284          * by us OR not generated by an external mac that is not proxied by us)
 1285          * AND forwarding is disabled, discard this PREP.
 1286          */
 1287         rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
 1288         if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
 1289             (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
 1290             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
 1291                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1292                     "discard PREP, orig(%6D) not proxied or generated by us",
 1293                     prep->prep_origaddr, ":");
 1294                 return;
 1295         }
 1296 
 1297         /* PREP ACCEPTED */
 1298 
 1299         /*
 1300          * If accepted shall create or update the active forwarding information
 1301          * it maintains for the target mesh STA of the PREP (according to the
 1302          * rules defined in 13.10.8.4). If the conditions for creating or
 1303          * updating the forwarding information have not been met in those
 1304          * rules, no further steps are applied to the PREP.
 1305          */
 1306         rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
 1307         if (rt == NULL) {
 1308                 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
 1309                 if (rt == NULL) {
 1310                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1311                             "unable to add PREP path to %6D",
 1312                             prep->prep_targetaddr, ":");
 1313                         vap->iv_stats.is_mesh_rtaddfailed++;
 1314                         return;
 1315                 }
 1316                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1317                     "adding target %6D", prep->prep_targetaddr, ":");
 1318         }
 1319         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1320         /* update path metric */
 1321         metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
 1322         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
 1323                 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
 1324                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1325                             "discard PREP from %6D, old seq no %u < %u",
 1326                             prep->prep_targetaddr, ":",
 1327                             prep->prep_targetseq, hr->hr_seq);
 1328                         return;
 1329                 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
 1330                     metric > rt->rt_metric) {
 1331                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1332                             "discard PREP from %6D, new metric %u > %u",
 1333                             prep->prep_targetaddr, ":",
 1334                             metric, rt->rt_metric);
 1335                         return;
 1336                 }
 1337         }
 1338 
 1339         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1340             "%s path to %6D, hopcount %d:%d metric %d:%d",
 1341             rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
 1342             "prefer" : "update",
 1343             prep->prep_targetaddr, ":",
 1344             rt->rt_nhops, prep->prep_hopcount + 1,
 1345             rt->rt_metric, metric);
 1346 
 1347         hr->hr_seq = prep->prep_targetseq;
 1348         hr->hr_preqretries = 0;
 1349         IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
 1350         rt->rt_metric = metric;
 1351         rt->rt_nhops = prep->prep_hopcount + 1;
 1352         ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
 1353         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
 1354                 /* discovery complete */
 1355                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
 1356         }
 1357         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
 1358 
 1359         /* Update forwarding information to TA if metric improves */
 1360         hwmp_update_transmitter(vap, ni, "PREP");
 1361 
 1362         /*
 1363          * If it's NOT for us, propagate the PREP
 1364          */
 1365         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
 1366             prep->prep_ttl > 1 &&
 1367             prep->prep_hopcount < hs->hs_maxhops) {
 1368                 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
 1369                 /*
 1370                  * NB: We should already have setup the path to orig
 1371                  * mesh STA when we propagated PREQ to target mesh STA,
 1372                  * no PREP is generated without a corresponding PREQ.
 1373                  * XXX: for now just ignore.
 1374                  */
 1375                 if (rtorig == NULL) {
 1376                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1377                             "received PREP for an unknown orig(%6D)",
 1378                             prep->prep_origaddr, ":");
 1379                         return;
 1380                 }
 1381 
 1382                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1383                     "propagate PREP from %6D",
 1384                     prep->prep_targetaddr, ":");
 1385 
 1386                 memcpy(&pprep, prep, sizeof(pprep));
 1387                 pprep.prep_hopcount += 1;
 1388                 pprep.prep_ttl -= 1;
 1389                 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
 1390                 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
 1391 
 1392                 /* precursor list for the Target Mesh STA Address is updated */
 1393         }
 1394 
 1395         /*
 1396          * Check if we received a PREP w/ AE and store target external address.
 1397          * We may store target external address if recevied PREP w/ AE
 1398          * and we are not final destination
 1399          */
 1400         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
 1401                 rtext = ieee80211_mesh_rt_find(vap,
 1402                         prep->prep_target_ext_addr);
 1403                 if (rtext == NULL) {
 1404                         rtext = ieee80211_mesh_rt_add(vap,
 1405                                 prep->prep_target_ext_addr);
 1406                         if (rtext == NULL) {
 1407                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1408                                     "unable to add PREP path to proxy %6D",
 1409                                     prep->prep_targetaddr, ":");
 1410                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1411                                 return;
 1412                         }
 1413                 }
 1414                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1415                     "%s path to %6D, hopcount %d:%d metric %d:%d",
 1416                     rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
 1417                     "prefer" : "update",
 1418                     prep->prep_target_ext_addr, ":",
 1419                     rtext->rt_nhops, prep->prep_hopcount + 1,
 1420                     rtext->rt_metric, metric);
 1421 
 1422                 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
 1423                         IEEE80211_MESHRT_FLAGS_VALID;
 1424                 IEEE80211_ADDR_COPY(rtext->rt_dest,
 1425                     prep->prep_target_ext_addr);
 1426                 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
 1427                     prep->prep_targetaddr);
 1428                 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
 1429                 rtext->rt_metric = metric;
 1430                 rtext->rt_lifetime = prep->prep_lifetime;
 1431                 rtext->rt_nhops = prep->prep_hopcount + 1;
 1432                 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
 1433                 /*
 1434                  * XXX: proxy entries have no HWMP priv data,
 1435                  * nullify them to be sure?
 1436                  */
 1437         }
 1438         /*
 1439          * Check for frames queued awaiting path discovery.
 1440          * XXX probably can tell exactly and avoid remove call
 1441          * NB: hash may have false matches, if so they will get
 1442          *     stuck back on the stageq because there won't be
 1443          *     a path.
 1444          */
 1445         addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
 1446             prep->prep_target_ext_addr : prep->prep_targetaddr;
 1447         m = ieee80211_ageq_remove(&ic->ic_stageq,
 1448             (struct ieee80211_node *)(uintptr_t)
 1449             ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
 1450 
 1451         /*
 1452          * All frames in the stageq here should be non-M_ENCAP; or things
 1453          * will get very unhappy.
 1454          */
 1455         for (; m != NULL; m = next) {
 1456                 next = m->m_nextpkt;
 1457                 m->m_nextpkt = NULL;
 1458                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1459                     "flush queued frame %p len %d", m, m->m_pkthdr.len);
 1460                 /*
 1461                  * If the mbuf has M_ENCAP set, ensure we free it.
 1462                  * Note that after if_transmit() is called, m is invalid.
 1463                  */
 1464                 (void) ieee80211_vap_xmitpkt(vap, m);
 1465         }
 1466 #undef  IS_PROXY
 1467 #undef  PROXIED_BY_US
 1468 }
 1469 
 1470 static int
 1471 hwmp_send_prep(struct ieee80211vap *vap,
 1472     const uint8_t da[IEEE80211_ADDR_LEN],
 1473     struct ieee80211_meshprep_ie *prep)
 1474 {
 1475         /* NB: there's no PREP minimum interval. */
 1476 
 1477         /*
 1478          * mesh prep action frame format
 1479          *     [6] da
 1480          *     [6] sa
 1481          *     [6] addr3 = sa
 1482          *     [1] action
 1483          *     [1] category
 1484          *     [tlv] mesh path reply
 1485          */
 1486         prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
 1487         prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
 1488             IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
 1489         return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
 1490 }
 1491 
 1492 #define PERR_DFLAGS(n)  perr.perr_dests[n].dest_flags
 1493 #define PERR_DADDR(n)   perr.perr_dests[n].dest_addr
 1494 #define PERR_DSEQ(n)    perr.perr_dests[n].dest_seq
 1495 #define PERR_DRCODE(n)  perr.perr_dests[n].dest_rcode
 1496 static void
 1497 hwmp_peerdown(struct ieee80211_node *ni)
 1498 {
 1499         struct ieee80211vap *vap = ni->ni_vap;
 1500         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1501         struct ieee80211_meshperr_ie perr;
 1502         struct ieee80211_mesh_route *rt;
 1503         struct ieee80211_hwmp_route *hr;
 1504 
 1505         rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
 1506         if (rt == NULL)
 1507                 return;
 1508         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1509         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1510             "%s", "delete route entry");
 1511         perr.perr_ttl = ms->ms_ttl;
 1512         perr.perr_ndests = 1;
 1513         PERR_DFLAGS(0) = 0;
 1514         if (hr->hr_seq == 0)
 1515                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
 1516         PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
 1517         IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
 1518         PERR_DSEQ(0) = ++hr->hr_seq;
 1519         PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
 1520         /* NB: flush everything passing through peer */
 1521         ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
 1522         hwmp_send_perr(vap, broadcastaddr, &perr);
 1523 }
 1524 #undef  PERR_DFLAGS
 1525 #undef  PERR_DADDR
 1526 #undef  PERR_DSEQ
 1527 #undef  PERR_DRCODE
 1528 
 1529 #define PERR_DFLAGS(n)          perr->perr_dests[n].dest_flags
 1530 #define PERR_DADDR(n)           perr->perr_dests[n].dest_addr
 1531 #define PERR_DSEQ(n)            perr->perr_dests[n].dest_seq
 1532 #define PERR_DEXTADDR(n)        perr->perr_dests[n].dest_ext_addr
 1533 static void
 1534 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1535     const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
 1536 {
 1537         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1538         struct ieee80211_mesh_route *rt = NULL;
 1539         struct ieee80211_mesh_route *rt_ext = NULL;
 1540         struct ieee80211_hwmp_route *hr;
 1541         struct ieee80211_meshperr_ie *pperr = NULL;
 1542         int i, j = 0, forward = 0;
 1543 
 1544         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1545             "received PERR from %6D", wh->i_addr2, ":");
 1546 
 1547         /*
 1548          * if forwarding is true, prepare pperr
 1549          */
 1550         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
 1551                 forward = 1;
 1552                 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
 1553                     M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
 1554         }
 1555 
 1556         /*
 1557          * Acceptance criteria: check if we have forwarding information
 1558          * stored about destination, and that nexthop == TA of this PERR.
 1559          * NB: we also build a new PERR to propagate in case we should forward.
 1560          */
 1561         for (i = 0; i < perr->perr_ndests; i++) {
 1562                 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
 1563                 if (rt == NULL)
 1564                         continue;
 1565                 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
 1566                         continue;
 1567 
 1568                 /* found and accepted a PERR ndest element, process it... */
 1569                 if (forward)
 1570                         memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
 1571                             sizeof(*perr->perr_dests));
 1572                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1573                 switch(PERR_DFLAGS(i)) {
 1574                 case (IEEE80211_REASON_MESH_PERR_NO_FI):
 1575                         if (PERR_DSEQ(i) == 0) {
 1576                                 hr->hr_seq++;
 1577                                 if (forward) {
 1578                                         pperr->perr_dests[j].dest_seq =
 1579                                             hr->hr_seq;
 1580                                 }
 1581                         } else {
 1582                                 hr->hr_seq = PERR_DSEQ(i);
 1583                         }
 1584                         rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
 1585                         j++;
 1586                         break;
 1587                 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
 1588                         if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
 1589                                 hr->hr_seq = PERR_DSEQ(i);
 1590                                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
 1591                                 j++;
 1592                         }
 1593                         break;
 1594                 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
 1595                         rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
 1596                         if (rt_ext != NULL) {
 1597                                 rt_ext->rt_flags &=
 1598                                     ~IEEE80211_MESHRT_FLAGS_VALID;
 1599                                 j++;
 1600                         }
 1601                         break;
 1602                 default:
 1603                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1604                             "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
 1605                         goto done; /* XXX: stats?? */
 1606                 }
 1607                 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
 1608                 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
 1609         }
 1610         if (j == 0) {
 1611                 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
 1612                     "PERR not accepted");
 1613                 goto done; /* XXX: stats?? */
 1614         }
 1615 
 1616         /*
 1617          * Propagate the PERR if we previously found it on our routing table.
 1618          */
 1619         if (forward && perr->perr_ttl > 1) {
 1620                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1621                     "propagate PERR from %6D", wh->i_addr2, ":");
 1622                 pperr->perr_ndests = j;
 1623                 pperr->perr_ttl--;
 1624                 hwmp_send_perr(vap, broadcastaddr, pperr);
 1625         }
 1626 done:
 1627         if (pperr != NULL)
 1628                 IEEE80211_FREE(pperr, M_80211_MESH_PERR);
 1629 }
 1630 #undef  PERR_DFLAGS
 1631 #undef  PERR_DADDR
 1632 #undef  PERR_DSEQ
 1633 #undef  PERR_DEXTADDR
 1634 
 1635 static int
 1636 hwmp_send_perr(struct ieee80211vap *vap,
 1637     const uint8_t da[IEEE80211_ADDR_LEN],
 1638     struct ieee80211_meshperr_ie *perr)
 1639 {
 1640         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1641         int i;
 1642         uint8_t length = 0;
 1643 
 1644         /*
 1645          * Enforce PERR interval.
 1646          */
 1647         if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
 1648                 return EALREADY;
 1649         getmicrouptime(&hs->hs_lastperr);
 1650 
 1651         /*
 1652          * mesh perr action frame format
 1653          *     [6] da
 1654          *     [6] sa
 1655          *     [6] addr3 = sa
 1656          *     [1] action
 1657          *     [1] category
 1658          *     [tlv] mesh path error
 1659          */
 1660         perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
 1661         length = IEEE80211_MESHPERR_BASE_SZ;
 1662         for (i = 0; i<perr->perr_ndests; i++) {
 1663                 if (perr->perr_dests[i].dest_flags &
 1664                     IEEE80211_MESHPERR_FLAGS_AE) {
 1665                         length += IEEE80211_MESHPERR_DEST_SZ_AE;
 1666                         continue ;
 1667                 }
 1668                 length += IEEE80211_MESHPERR_DEST_SZ;
 1669         }
 1670         perr->perr_len =length;
 1671         return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
 1672 }
 1673 
 1674 /*
 1675  * Called from the rest of the net80211 code (mesh code for example).
 1676  * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
 1677  * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
 1678  */
 1679 #define PERR_DFLAGS(n)          perr.perr_dests[n].dest_flags
 1680 #define PERR_DADDR(n)           perr.perr_dests[n].dest_addr
 1681 #define PERR_DSEQ(n)            perr.perr_dests[n].dest_seq
 1682 #define PERR_DEXTADDR(n)        perr.perr_dests[n].dest_ext_addr
 1683 #define PERR_DRCODE(n)          perr.perr_dests[n].dest_rcode
 1684 static void
 1685 hwmp_senderror(struct ieee80211vap *vap,
 1686     const uint8_t addr[IEEE80211_ADDR_LEN],
 1687     struct ieee80211_mesh_route *rt, int rcode)
 1688 {
 1689         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1690         struct ieee80211_hwmp_route *hr = NULL;
 1691         struct ieee80211_meshperr_ie perr;
 1692 
 1693         if (rt != NULL)
 1694                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
 1695                     struct ieee80211_hwmp_route);
 1696 
 1697         perr.perr_ndests = 1;
 1698         perr.perr_ttl = ms->ms_ttl;
 1699         PERR_DFLAGS(0) = 0;
 1700         PERR_DRCODE(0) = rcode;
 1701 
 1702         switch (rcode) {
 1703         case IEEE80211_REASON_MESH_PERR_NO_FI:
 1704                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
 1705                 PERR_DSEQ(0) = 0; /* reserved */
 1706                 break;
 1707         case IEEE80211_REASON_MESH_PERR_NO_PROXY:
 1708                 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
 1709                 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
 1710                     ("route is not marked proxy"));
 1711                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
 1712                 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
 1713                 PERR_DSEQ(0) = rt->rt_ext_seq;
 1714                 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
 1715                 break;
 1716         case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
 1717                 KASSERT(rt != NULL, ("no route info for sending PERR"));
 1718                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
 1719                 PERR_DSEQ(0) = hr->hr_seq;
 1720                 break;
 1721         default:
 1722                 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
 1723         }
 1724         hwmp_send_perr(vap, broadcastaddr, &perr);
 1725 }
 1726 #undef  PERR_DFLAGS
 1727 #undef  PEER_DADDR
 1728 #undef  PERR_DSEQ
 1729 #undef  PERR_DEXTADDR
 1730 #undef  PERR_DRCODE
 1731 
 1732 static void
 1733 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1734     const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
 1735 {
 1736         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1737         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1738         struct ieee80211_mesh_route *rt = NULL;
 1739         struct ieee80211_hwmp_route *hr;
 1740         struct ieee80211_meshpreq_ie preq;
 1741         struct ieee80211_meshrann_ie prann;
 1742 
 1743         if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
 1744                 return;
 1745 
 1746         rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
 1747         if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
 1748                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1749 
 1750                 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
 1751                 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
 1752                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1753                         "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
 1754                         return;
 1755                 }
 1756 
 1757                 /* Acceptance criteria: if RANN.seq == stored seq AND
 1758                 * RANN.metric > stored metric, discard RANN */
 1759                 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
 1760                 rann->rann_metric > rt->rt_metric) {
 1761                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1762                         "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
 1763                         return;
 1764                 }
 1765         }
 1766 
 1767         /* RANN ACCEPTED */
 1768 
 1769         ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
 1770 
 1771         if (rt == NULL) {
 1772                 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
 1773                 if (rt == NULL) {
 1774                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1775                             "unable to add mac for RANN root %6D",
 1776                             rann->rann_addr, ":");
 1777                             vap->iv_stats.is_mesh_rtaddfailed++;
 1778                         return;
 1779                 }
 1780         }
 1781         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1782         /* Check if root is a mesh gate, mark it */
 1783         if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
 1784                 struct ieee80211_mesh_gate_route *gr;
 1785 
 1786                 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
 1787                 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
 1788                         rt);
 1789                 gr->gr_lastseq = 0; /* NOT GANN */
 1790         }
 1791         /* discovery timeout */
 1792         ieee80211_mesh_rt_update(rt,
 1793             ticks_to_msecs(ieee80211_hwmp_roottimeout));
 1794 
 1795         preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
 1796         preq.preq_hopcount = 0;
 1797         preq.preq_ttl = ms->ms_ttl;
 1798         preq.preq_id = 0; /* reserved */
 1799         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1800         preq.preq_origseq = ++hs->hs_seq;
 1801         preq.preq_lifetime = ieee80211_hwmp_roottimeout;
 1802         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1803         preq.preq_tcount = 1;
 1804         preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
 1805         /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
 1806         IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
 1807         preq.preq_targets[0].target_seq = rann->rann_seq;
 1808         /* XXX: if rootconfint have not passed, we built this preq in vain */
 1809         hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
 1810             &ieee80211_hwmp_rootconfint);
 1811 
 1812         /* propagate a RANN */
 1813         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1814             rann->rann_ttl > 1 &&
 1815             ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
 1816                 hr->hr_seq = rann->rann_seq;
 1817                 memcpy(&prann, rann, sizeof(prann));
 1818                 prann.rann_hopcount += 1;
 1819                 prann.rann_ttl -= 1;
 1820                 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
 1821                 hwmp_send_rann(vap, broadcastaddr, &prann);
 1822         }
 1823 }
 1824 
 1825 static int
 1826 hwmp_send_rann(struct ieee80211vap *vap,
 1827     const uint8_t da[IEEE80211_ADDR_LEN],
 1828     struct ieee80211_meshrann_ie *rann)
 1829 {
 1830         /*
 1831          * mesh rann action frame format
 1832          *     [6] da
 1833          *     [6] sa
 1834          *     [6] addr3 = sa
 1835          *     [1] action
 1836          *     [1] category
 1837          *     [tlv] root annoucement
 1838          */
 1839         rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
 1840         rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
 1841         return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
 1842 }
 1843 
 1844 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
 1845 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
 1846 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
 1847 static void
 1848 hwmp_rediscover_cb(void *arg)
 1849 {
 1850         struct ieee80211_mesh_route *rt = arg;
 1851         struct ieee80211vap *vap = rt->rt_vap;
 1852         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1853         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1854         struct ieee80211_hwmp_route *hr;
 1855         struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
 1856 
 1857         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
 1858                 return ; /* nothing to do */
 1859 
 1860         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1861         if (hr->hr_preqretries >=
 1862                 ieee80211_hwmp_maxpreq_retries) {
 1863                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
 1864                         rt->rt_dest, "%s",
 1865                         "max number of discovery, send queued frames to GATE");
 1866                 ieee80211_mesh_forward_to_gates(vap, rt);
 1867                 vap->iv_stats.is_mesh_fwd_nopath++;
 1868                 return ; /* XXX: flush queue? */
 1869         }
 1870 
 1871         hr->hr_preqretries++;
 1872 
 1873 
 1874         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
 1875             "start path rediscovery , target seq %u", hr->hr_seq);
 1876         /*
 1877          * Try to discover the path for this node.
 1878          * Group addressed PREQ Case A
 1879          */
 1880         preq.preq_flags = 0;
 1881         preq.preq_hopcount = 0;
 1882         preq.preq_ttl = ms->ms_ttl;
 1883         preq.preq_id = ++hs->hs_preqid;
 1884         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1885         preq.preq_origseq = hr->hr_origseq;
 1886         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
 1887         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1888         preq.preq_tcount = 1;
 1889         IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
 1890         PREQ_TFLAGS(0) = 0;
 1891         if (ieee80211_hwmp_targetonly)
 1892                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
 1893         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
 1894         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
 1895         /* XXX check return value */
 1896         hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
 1897             &ieee80211_hwmp_preqminint);
 1898         callout_reset(&rt->rt_discovery,
 1899                 ieee80211_hwmp_net_diameter_traversaltime * 2,
 1900                 hwmp_rediscover_cb, rt);
 1901 }
 1902 
 1903 static struct ieee80211_node *
 1904 hwmp_discover(struct ieee80211vap *vap,
 1905     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
 1906 {
 1907         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1908         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1909         struct ieee80211_mesh_route *rt = NULL;
 1910         struct ieee80211_hwmp_route *hr;
 1911         struct ieee80211_meshpreq_ie preq;
 1912         struct ieee80211_node *ni;
 1913         int sendpreq = 0;
 1914 
 1915         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
 1916             ("not a mesh vap, opmode %d", vap->iv_opmode));
 1917 
 1918         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
 1919             ("%s: discovering self!", __func__));
 1920 
 1921         ni = NULL;
 1922         if (!IEEE80211_IS_MULTICAST(dest)) {
 1923                 rt = ieee80211_mesh_rt_find(vap, dest);
 1924                 if (rt == NULL) {
 1925                         rt = ieee80211_mesh_rt_add(vap, dest);
 1926                         if (rt == NULL) {
 1927                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
 1928                                     ni, "unable to add discovery path to %6D",
 1929                                     dest, ":");
 1930                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1931                                 goto done;
 1932                         }
 1933                 }
 1934                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
 1935                     struct ieee80211_hwmp_route);
 1936                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
 1937                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 1938                             "%s", "already discovering queue frame until path found");
 1939                         sendpreq = 1;
 1940                         goto done;
 1941                 }
 1942                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
 1943                         if (hr->hr_lastdiscovery != 0 &&
 1944                             (ticks - hr->hr_lastdiscovery <
 1945                             (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
 1946                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1947                                     dest, NULL, "%s",
 1948                                     "too frequent discovery requeust");
 1949                                 sendpreq = 1;
 1950                                 goto done;
 1951                         }
 1952                         hr->hr_lastdiscovery = ticks;
 1953                         if (hr->hr_preqretries >=
 1954                             ieee80211_hwmp_maxpreq_retries) {
 1955                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1956                                     dest, NULL, "%s",
 1957                                     "no valid path , max number of discovery");
 1958                                 vap->iv_stats.is_mesh_fwd_nopath++;
 1959                                 goto done;
 1960                         }
 1961                         rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
 1962                         hr->hr_preqretries++;
 1963                         if (hr->hr_origseq == 0)
 1964                                 hr->hr_origseq = ++hs->hs_seq;
 1965                         rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1966                         sendpreq = 1;
 1967                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 1968                             "start path discovery (src %s), target seq %u",
 1969                             m == NULL ? "<none>" : ether_sprintf(
 1970                             mtod(m, struct ether_header *)->ether_shost),
 1971                             hr->hr_seq);
 1972                         /*
 1973                          * Try to discover the path for this node.
 1974                          * Group addressed PREQ Case A
 1975                          */
 1976                         preq.preq_flags = 0;
 1977                         preq.preq_hopcount = 0;
 1978                         preq.preq_ttl = ms->ms_ttl;
 1979                         preq.preq_id = ++hs->hs_preqid;
 1980                         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1981                         preq.preq_origseq = hr->hr_origseq;
 1982                         preq.preq_lifetime =
 1983                             ticks_to_msecs(ieee80211_hwmp_pathtimeout);
 1984                         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1985                         preq.preq_tcount = 1;
 1986                         IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
 1987                         PREQ_TFLAGS(0) = 0;
 1988                         if (ieee80211_hwmp_targetonly)
 1989                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
 1990                         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
 1991                         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
 1992                         /* XXX check return value */
 1993                         hwmp_send_preq(vap, broadcastaddr, &preq,
 1994                             &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
 1995                         callout_reset(&rt->rt_discovery,
 1996                             ieee80211_hwmp_net_diameter_traversaltime * 2,
 1997                             hwmp_rediscover_cb, rt);
 1998                 }
 1999                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
 2000                         ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
 2001         } else {
 2002                 ni = ieee80211_find_txnode(vap, dest);
 2003                 /* NB: if null then we leak mbuf */
 2004                 KASSERT(ni != NULL, ("leak mcast frame"));
 2005                 return ni;
 2006         }
 2007 done:
 2008         if (ni == NULL && m != NULL) {
 2009                 if (sendpreq) {
 2010                         struct ieee80211com *ic = vap->iv_ic;
 2011                         /*
 2012                          * Queue packet for transmit when path discovery
 2013                          * completes.  If discovery never completes the
 2014                          * frame will be flushed by way of the aging timer.
 2015                          */
 2016                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 2017                             "%s", "queue frame until path found");
 2018                         m->m_pkthdr.rcvif = (void *)(uintptr_t)
 2019                             ieee80211_mac_hash(ic, dest);
 2020                         /* XXX age chosen randomly */
 2021                         ieee80211_ageq_append(&ic->ic_stageq, m,
 2022                             IEEE80211_INACT_WAIT);
 2023                 } else {
 2024                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 2025                             dest, NULL, "%s", "no valid path to this node");
 2026                         m_freem(m);
 2027                 }
 2028         }
 2029         return ni;
 2030 }
 2031 #undef  PREQ_TFLAGS
 2032 #undef  PREQ_TADDR
 2033 #undef  PREQ_TSEQ
 2034 
 2035 static int
 2036 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2037 {
 2038         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 2039         int error;
 2040 
 2041         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2042                 return ENOSYS;
 2043         error = 0;
 2044         switch (ireq->i_type) {
 2045         case IEEE80211_IOC_HWMP_ROOTMODE:
 2046                 ireq->i_val = hs->hs_rootmode;
 2047                 break;
 2048         case IEEE80211_IOC_HWMP_MAXHOPS:
 2049                 ireq->i_val = hs->hs_maxhops;
 2050                 break;
 2051         default:
 2052                 return ENOSYS;
 2053         }
 2054         return error;
 2055 }
 2056 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
 2057 
 2058 static int
 2059 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2060 {
 2061         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 2062         int error;
 2063 
 2064         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2065                 return ENOSYS;
 2066         error = 0;
 2067         switch (ireq->i_type) {
 2068         case IEEE80211_IOC_HWMP_ROOTMODE:
 2069                 if (ireq->i_val < 0 || ireq->i_val > 3)
 2070                         return EINVAL;
 2071                 hs->hs_rootmode = ireq->i_val;
 2072                 hwmp_rootmode_setup(vap);
 2073                 break;
 2074         case IEEE80211_IOC_HWMP_MAXHOPS:
 2075                 if (ireq->i_val <= 0 || ireq->i_val > 255)
 2076                         return EINVAL;
 2077                 hs->hs_maxhops = ireq->i_val;
 2078                 break;
 2079         default:
 2080                 return ENOSYS;
 2081         }
 2082         return error;
 2083 }
 2084 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);

Cache object: e8cf33371129dd25dc70fce44abf8168


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