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  * Copyright (c) 2009 The FreeBSD Foundation 
    3  * All rights reserved. 
    4  * 
    5  * This software was developed by Rui Paulo under sponsorship from the
    6  * FreeBSD Foundation. 
    7  *  
    8  * Redistribution and use in source and binary forms, with or without 
    9  * modification, are permitted provided that the following conditions 
   10  * are met: 
   11  * 1. Redistributions of source code must retain the above copyright 
   12  *    notice, this list of conditions and the following disclaimer. 
   13  * 2. Redistributions in binary form must reproduce the above copyright 
   14  *    notice, this list of conditions and the following disclaimer in the 
   15  *    documentation and/or other materials provided with the distribution. 
   16  * 
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
   27  * SUCH DAMAGE. 
   28  */ 
   29 #include <sys/cdefs.h>
   30 #ifdef __FreeBSD__
   31 __FBSDID("$FreeBSD: releng/10.2/sys/net80211/ieee80211_hwmp.c 273736 2014-10-27 14:38:00Z hselasky $");
   32 #endif
   33 
   34 /*
   35  * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
   36  *
   37  * Based on March 2009, D3.0 802.11s draft spec.
   38  */
   39 #include "opt_inet.h"
   40 #include "opt_wlan.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/mbuf.h>
   45 #include <sys/malloc.h>
   46 #include <sys/kernel.h>
   47 
   48 #include <sys/socket.h>
   49 #include <sys/sockio.h>
   50 #include <sys/endian.h>
   51 #include <sys/errno.h>
   52 #include <sys/proc.h>
   53 #include <sys/sysctl.h>
   54 
   55 #include <net/if.h>
   56 #include <net/if_media.h>
   57 #include <net/if_llc.h>
   58 #include <net/ethernet.h>
   59 
   60 #include <net/bpf.h>
   61 
   62 #include <net80211/ieee80211_var.h>
   63 #include <net80211/ieee80211_action.h>
   64 #include <net80211/ieee80211_input.h>
   65 #include <net80211/ieee80211_mesh.h>
   66 
   67 static void     hwmp_vattach(struct ieee80211vap *);
   68 static void     hwmp_vdetach(struct ieee80211vap *);
   69 static int      hwmp_newstate(struct ieee80211vap *,
   70                     enum ieee80211_state, int);
   71 static int      hwmp_send_action(struct ieee80211vap *,
   72                     const uint8_t [IEEE80211_ADDR_LEN],
   73                     uint8_t *, size_t);
   74 static uint8_t * hwmp_add_meshpreq(uint8_t *,
   75                     const struct ieee80211_meshpreq_ie *);
   76 static uint8_t * hwmp_add_meshprep(uint8_t *,
   77                     const struct ieee80211_meshprep_ie *);
   78 static uint8_t * hwmp_add_meshperr(uint8_t *,
   79                     const struct ieee80211_meshperr_ie *);
   80 static uint8_t * hwmp_add_meshrann(uint8_t *,
   81                     const struct ieee80211_meshrann_ie *);
   82 static void     hwmp_rootmode_setup(struct ieee80211vap *);
   83 static void     hwmp_rootmode_cb(void *);
   84 static void     hwmp_rootmode_rann_cb(void *);
   85 static void     hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
   86                     const struct ieee80211_frame *,
   87                     const struct ieee80211_meshpreq_ie *);
   88 static int      hwmp_send_preq(struct ieee80211vap *,
   89                     const uint8_t [IEEE80211_ADDR_LEN],
   90                     struct ieee80211_meshpreq_ie *,
   91                     struct timeval *, struct timeval *);
   92 static void     hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
   93                     const struct ieee80211_frame *,
   94                     const struct ieee80211_meshprep_ie *);
   95 static int      hwmp_send_prep(struct ieee80211vap *,
   96                     const uint8_t [IEEE80211_ADDR_LEN],
   97                     struct ieee80211_meshprep_ie *);
   98 static void     hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
   99                     const struct ieee80211_frame *,
  100                     const struct ieee80211_meshperr_ie *);
  101 static int      hwmp_send_perr(struct ieee80211vap *,
  102                     const uint8_t [IEEE80211_ADDR_LEN],
  103                     struct ieee80211_meshperr_ie *);
  104 static void     hwmp_senderror(struct ieee80211vap *,
  105                     const uint8_t [IEEE80211_ADDR_LEN],
  106                     struct ieee80211_mesh_route *, int);
  107 static void     hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
  108                    const struct ieee80211_frame *,
  109                    const struct ieee80211_meshrann_ie *);
  110 static int      hwmp_send_rann(struct ieee80211vap *,
  111                     const uint8_t [IEEE80211_ADDR_LEN],
  112                     struct ieee80211_meshrann_ie *);
  113 static struct ieee80211_node *
  114                 hwmp_discover(struct ieee80211vap *,
  115                     const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
  116 static void     hwmp_peerdown(struct ieee80211_node *);
  117 
  118 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
  119 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
  120 
  121 /* unalligned little endian access */
  122 #define LE_WRITE_2(p, v) do {                           \
  123         ((uint8_t *)(p))[0] = (v) & 0xff;               \
  124         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
  125 } while (0)
  126 #define LE_WRITE_4(p, v) do {                           \
  127         ((uint8_t *)(p))[0] = (v) & 0xff;               \
  128         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
  129         ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff;       \
  130         ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff;       \
  131 } while (0)
  132 
  133 
  134 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
  135 static const uint8_t    broadcastaddr[IEEE80211_ADDR_LEN] =
  136         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  137 
  138 typedef uint32_t ieee80211_hwmp_seq;
  139 #define HWMP_SEQ_LT(a, b)       ((int32_t)((a)-(b)) < 0)
  140 #define HWMP_SEQ_LEQ(a, b)      ((int32_t)((a)-(b)) <= 0)
  141 #define HWMP_SEQ_EQ(a, b)       ((int32_t)((a)-(b)) == 0)
  142 #define HWMP_SEQ_GT(a, b)       ((int32_t)((a)-(b)) > 0)
  143 #define HWMP_SEQ_GEQ(a, b)      ((int32_t)((a)-(b)) >= 0)
  144 
  145 #define HWMP_SEQ_MAX(a, b)      (a > b ? a : b)
  146 
  147 /*
  148  * Private extension of ieee80211_mesh_route.
  149  */
  150 struct ieee80211_hwmp_route {
  151         ieee80211_hwmp_seq      hr_seq;         /* last HWMP seq seen from dst*/
  152         ieee80211_hwmp_seq      hr_preqid;      /* last PREQ ID seen from dst */
  153         ieee80211_hwmp_seq      hr_origseq;     /* seq. no. on our latest PREQ*/
  154         struct timeval          hr_lastpreq;    /* last time we sent a PREQ */
  155         struct timeval          hr_lastrootconf; /* last sent PREQ root conf */
  156         int                     hr_preqretries; /* number of discoveries */
  157         int                     hr_lastdiscovery; /* last discovery in ticks */
  158 };
  159 struct ieee80211_hwmp_state {
  160         ieee80211_hwmp_seq      hs_seq;         /* next seq to be used */
  161         ieee80211_hwmp_seq      hs_preqid;      /* next PREQ ID to be used */
  162         int                     hs_rootmode;    /* proactive HWMP */
  163         struct timeval          hs_lastperr;    /* last time we sent a PERR */
  164         struct callout          hs_roottimer;
  165         uint8_t                 hs_maxhops;     /* max hop count */
  166 };
  167 
  168 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
  169     "IEEE 802.11s HWMP parameters");
  170 static int      ieee80211_hwmp_targetonly = 0;
  171 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
  172     &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
  173 static int      ieee80211_hwmp_pathtimeout = -1;
  174 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
  175     &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  176     "path entry lifetime (ms)");
  177 static int      ieee80211_hwmp_maxpreq_retries = -1;
  178 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW,
  179     &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
  180     "maximum number of preq retries");
  181 static int      ieee80211_hwmp_net_diameter_traversaltime = -1;
  182 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
  183     CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0,
  184     ieee80211_sysctl_msecs_ticks, "I",
  185     "estimate travelse time across the MBSS (ms)");
  186 static int      ieee80211_hwmp_roottimeout = -1;
  187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
  188     &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  189     "root PREQ timeout (ms)");
  190 static int      ieee80211_hwmp_rootint = -1;
  191 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
  192     &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
  193     "root interval (ms)");
  194 static int      ieee80211_hwmp_rannint = -1;
  195 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
  196     &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
  197     "root announcement interval (ms)");
  198 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
  199 static int      ieee80211_hwmp_rootconfint_internal = -1;
  200 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD,
  201     &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
  202     "root confirmation interval (ms) (read-only)");
  203 
  204 #define IEEE80211_HWMP_DEFAULT_MAXHOPS  31
  205 
  206 static  ieee80211_recv_action_func hwmp_recv_action_meshpath;
  207 
  208 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
  209         .mpp_descr      = "HWMP",
  210         .mpp_ie         = IEEE80211_MESHCONF_PATH_HWMP,
  211         .mpp_discover   = hwmp_discover,
  212         .mpp_peerdown   = hwmp_peerdown,
  213         .mpp_senderror  = hwmp_senderror,
  214         .mpp_vattach    = hwmp_vattach,
  215         .mpp_vdetach    = hwmp_vdetach,
  216         .mpp_newstate   = hwmp_newstate,
  217         .mpp_privlen    = sizeof(struct ieee80211_hwmp_route),
  218 };
  219 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
  220         &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
  221         "mesh route inactivity timeout (ms)");
  222 
  223 
  224 static void
  225 ieee80211_hwmp_init(void)
  226 {
  227         /* Default values as per amendment */
  228         ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
  229         ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
  230         ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
  231         ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
  232         ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
  233         ieee80211_hwmp_maxpreq_retries = 3;
  234         /*
  235          * (TU): A measurement of time equal to 1024 μs,
  236          * 500 TU is 512 ms.
  237          */
  238         ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
  239 
  240         /*
  241          * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
  242          * and return a struct timeval...
  243          */
  244         ieee80211_hwmp_rootconfint.tv_usec =
  245             ieee80211_hwmp_rootconfint_internal * 1000;
  246 
  247         /*
  248          * Register action frame handler.
  249          */
  250         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
  251             IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
  252 
  253         /* NB: default is 5 secs per spec */
  254         mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
  255 
  256         /*
  257          * Register HWMP.
  258          */
  259         ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
  260 }
  261 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
  262 
  263 void
  264 hwmp_vattach(struct ieee80211vap *vap)
  265 {
  266         struct ieee80211_hwmp_state *hs;
  267 
  268         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
  269             ("not a mesh vap, opmode %d", vap->iv_opmode));
  270 
  271         hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
  272             M_NOWAIT | M_ZERO);
  273         if (hs == NULL) {
  274                 printf("%s: couldn't alloc HWMP state\n", __func__);
  275                 return;
  276         }
  277         hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
  278         callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE);
  279         vap->iv_hwmp = hs;
  280 }
  281 
  282 void
  283 hwmp_vdetach(struct ieee80211vap *vap)
  284 {
  285         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  286 
  287         callout_drain(&hs->hs_roottimer);
  288         free(vap->iv_hwmp, M_80211_VAP);
  289         vap->iv_hwmp = NULL;
  290 } 
  291 
  292 int
  293 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
  294 {
  295         enum ieee80211_state nstate = vap->iv_state;
  296         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  297 
  298         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  299             __func__, ieee80211_state_name[ostate],
  300             ieee80211_state_name[nstate], arg);
  301 
  302         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
  303                 callout_drain(&hs->hs_roottimer);
  304         if (nstate == IEEE80211_S_RUN)
  305                 hwmp_rootmode_setup(vap);
  306         return 0;
  307 }
  308 
  309 /*
  310  * Verify the length of an HWMP PREQ and return the number
  311  * of destinations >= 1, if verification fails -1 is returned.
  312  */
  313 static int
  314 verify_mesh_preq_len(struct ieee80211vap *vap,
  315     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  316 {
  317         int alloc_sz = -1;
  318         int ndest = -1;
  319         if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
  320                 /* Originator External Address  present */
  321                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ_AE;
  322                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
  323         } else {
  324                 /* w/o Originator External Address */
  325                 alloc_sz =  IEEE80211_MESHPREQ_BASE_SZ;
  326                 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
  327         }
  328         alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
  329 
  330         if(iefrm[1] != (alloc_sz)) {
  331                 IEEE80211_DISCARD(vap,
  332                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  333                     wh, NULL, "PREQ (AE=%s) with wrong len",
  334                     iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "");
  335                 return (-1);
  336         }
  337         return ndest;
  338 }
  339 
  340 /*
  341  * Verify the length of an HWMP PREP and returns 1 on success,
  342  * otherwise -1.
  343  */
  344 static int
  345 verify_mesh_prep_len(struct ieee80211vap *vap,
  346     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  347 {
  348         int alloc_sz = -1;
  349         if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
  350                 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
  351                         alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
  352         } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
  353                 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
  354         if(alloc_sz < 0) {
  355                 IEEE80211_DISCARD(vap,
  356                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  357                     wh, NULL, "PREP (AE=%s) with wrong len",
  358                     iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "");
  359                 return (-1);
  360         }
  361         return (1);
  362 }
  363 
  364 /*
  365  * Verify the length of an HWMP PERR and return the number
  366  * of destinations >= 1, if verification fails -1 is returned.
  367  */
  368 static int
  369 verify_mesh_perr_len(struct ieee80211vap *vap,
  370     const struct ieee80211_frame *wh, const uint8_t *iefrm)
  371 {
  372         int alloc_sz = -1;
  373         const uint8_t *iefrm_t = iefrm;
  374         uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
  375         int i;
  376 
  377         if(ndest > IEEE80211_MESHPERR_MAXDEST) {
  378                 IEEE80211_DISCARD(vap,
  379                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  380                     wh, NULL, "PERR with wrong number of destionat (>19), %u",
  381                     ndest);
  382                 return (-1);
  383         }
  384 
  385         iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
  386         /* We need to check each destionation flag to know size */
  387         for(i = 0; i<ndest; i++) {
  388                 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
  389                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
  390                 else
  391                         iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
  392         }
  393 
  394         alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
  395         if(alloc_sz !=  iefrm[1]) {
  396                 IEEE80211_DISCARD(vap,
  397                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  398                     wh, NULL, "%s", "PERR with wrong len");
  399                 return (-1);
  400         }
  401         return ndest;
  402 }
  403 
  404 static int
  405 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
  406         const struct ieee80211_frame *wh,
  407         const uint8_t *frm, const uint8_t *efrm)
  408 {
  409         struct ieee80211vap *vap = ni->ni_vap;
  410         struct ieee80211_meshpreq_ie *preq;
  411         struct ieee80211_meshprep_ie *prep;
  412         struct ieee80211_meshperr_ie *perr;
  413         struct ieee80211_meshrann_ie rann;
  414         const uint8_t *iefrm = frm + 2; /* action + code */
  415         const uint8_t *iefrm_t = iefrm; /* temporary pointer */
  416         int ndest = -1;
  417         int found = 0;
  418 
  419         while (efrm - iefrm > 1) {
  420                 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
  421                 switch (*iefrm) {
  422                 case IEEE80211_ELEMID_MESHPREQ:
  423                 {
  424                         int i = 0;
  425 
  426                         iefrm_t = iefrm;
  427                         ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
  428                         if (ndest < 0) {
  429                                 vap->iv_stats.is_rx_mgtdiscard++;
  430                                 break;
  431                         }
  432                         preq = malloc(sizeof(*preq) +
  433                             (ndest - 1) * sizeof(*preq->preq_targets),
  434                             M_80211_MESH_PREQ, M_NOWAIT | M_ZERO);
  435                         KASSERT(preq != NULL, ("preq == NULL"));
  436 
  437                         preq->preq_ie = *iefrm_t++;
  438                         preq->preq_len = *iefrm_t++;
  439                         preq->preq_flags = *iefrm_t++;
  440                         preq->preq_hopcount = *iefrm_t++;
  441                         preq->preq_ttl = *iefrm_t++;
  442                         preq->preq_id = LE_READ_4(iefrm_t); iefrm_t += 4;
  443                         IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
  444                         iefrm_t += 6;
  445                         preq->preq_origseq = LE_READ_4(iefrm_t); iefrm_t += 4;
  446                         /* NB: may have Originator Proxied Address */
  447                         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE)  {
  448                                 IEEE80211_ADDR_COPY(
  449                                     preq->preq_orig_ext_addr, iefrm_t);
  450                                 iefrm_t += 6;
  451                         }
  452                         preq->preq_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4;
  453                         preq->preq_metric = LE_READ_4(iefrm_t); iefrm_t += 4;
  454                         preq->preq_tcount = *iefrm_t++;
  455                         
  456                         for (i = 0; i < preq->preq_tcount; i++) {
  457                                 preq->preq_targets[i].target_flags = *iefrm_t++;
  458                                 IEEE80211_ADDR_COPY(
  459                                     preq->preq_targets[i].target_addr, iefrm_t);
  460                                 iefrm_t += 6;
  461                                 preq->preq_targets[i].target_seq =
  462                                     LE_READ_4(iefrm_t);
  463                                 iefrm_t += 4;
  464                         }
  465 
  466                         hwmp_recv_preq(vap, ni, wh, preq);
  467                         free(preq, M_80211_MESH_PREQ);
  468                         found++;
  469                         break;
  470                 }
  471                 case IEEE80211_ELEMID_MESHPREP:
  472                 {
  473                         iefrm_t = iefrm;
  474                         ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
  475                         if (ndest < 0) {
  476                                 vap->iv_stats.is_rx_mgtdiscard++;
  477                                 break;
  478                         }
  479                         prep = malloc(sizeof(*prep),
  480                             M_80211_MESH_PREP, M_NOWAIT | M_ZERO);
  481                         KASSERT(prep != NULL, ("prep == NULL"));
  482 
  483                         prep->prep_ie = *iefrm_t++;
  484                         prep->prep_len = *iefrm_t++;
  485                         prep->prep_flags = *iefrm_t++;
  486                         prep->prep_hopcount = *iefrm_t++;
  487                         prep->prep_ttl = *iefrm_t++;
  488                         IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
  489                         iefrm_t += 6;
  490                         prep->prep_targetseq = LE_READ_4(iefrm_t); iefrm_t += 4;
  491                         /* NB: May have Target Proxied Address */
  492                         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE)  {
  493                                 IEEE80211_ADDR_COPY(
  494                                     prep->prep_target_ext_addr, iefrm_t);
  495                                 iefrm_t += 6;
  496                         }
  497                         prep->prep_lifetime = LE_READ_4(iefrm_t); iefrm_t += 4;
  498                         prep->prep_metric = LE_READ_4(iefrm_t); iefrm_t += 4;
  499                         IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
  500                         iefrm_t += 6;
  501                         prep->prep_origseq = LE_READ_4(iefrm_t); iefrm_t += 4;
  502 
  503                         hwmp_recv_prep(vap, ni, wh, prep);
  504                         free(prep, M_80211_MESH_PREP);
  505                         found++;
  506                         break;
  507                 }
  508                 case IEEE80211_ELEMID_MESHPERR:
  509                 {
  510                         int i = 0;
  511 
  512                         iefrm_t = iefrm;
  513                         ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
  514                         if (ndest < 0) {
  515                                 vap->iv_stats.is_rx_mgtdiscard++;
  516                                 break;
  517                         }
  518                         perr = malloc(sizeof(*perr) +
  519                             (ndest - 1) * sizeof(*perr->perr_dests),
  520                             M_80211_MESH_PERR, M_NOWAIT | M_ZERO);
  521                         KASSERT(perr != NULL, ("perr == NULL"));
  522 
  523                         perr->perr_ie = *iefrm_t++;
  524                         perr->perr_len = *iefrm_t++;
  525                         perr->perr_ttl = *iefrm_t++;
  526                         perr->perr_ndests = *iefrm_t++;
  527 
  528                         for (i = 0; i<perr->perr_ndests; i++) {
  529                                 perr->perr_dests[i].dest_flags = *iefrm_t++;
  530                                 IEEE80211_ADDR_COPY(
  531                                     perr->perr_dests[i].dest_addr, iefrm_t);
  532                                 iefrm_t += 6;
  533                                 perr->perr_dests[i].dest_seq = LE_READ_4(iefrm_t);
  534                                 iefrm_t += 4;
  535                                 /* NB: May have Target Proxied Address */
  536                                 if (perr->perr_dests[i].dest_flags &
  537                                     IEEE80211_MESHPERR_FLAGS_AE) {
  538                                         IEEE80211_ADDR_COPY(
  539                                             perr->perr_dests[i].dest_ext_addr,
  540                                             iefrm_t);
  541                                         iefrm_t += 6;
  542                                 }
  543                                 perr->perr_dests[i].dest_rcode =
  544                                     LE_READ_2(iefrm_t);
  545                                 iefrm_t += 2;
  546                         }
  547 
  548                         hwmp_recv_perr(vap, ni, wh, perr);
  549                         free(perr, M_80211_MESH_PERR);
  550                         found++;
  551                         break;
  552                 }
  553                 case IEEE80211_ELEMID_MESHRANN:
  554                 {
  555                         const struct ieee80211_meshrann_ie *mrann =
  556                             (const struct ieee80211_meshrann_ie *) iefrm;
  557                         if (mrann->rann_len !=
  558                             sizeof(struct ieee80211_meshrann_ie) - 2) {
  559                                 IEEE80211_DISCARD(vap,
  560                                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  561                                     wh, NULL, "%s", "RAN with wrong len");
  562                                     vap->iv_stats.is_rx_mgtdiscard++;
  563                                 return 1;
  564                         }
  565                         memcpy(&rann, mrann, sizeof(rann));
  566                         rann.rann_seq = LE_READ_4(&mrann->rann_seq);
  567                         rann.rann_interval = LE_READ_4(&mrann->rann_interval);
  568                         rann.rann_metric = LE_READ_4(&mrann->rann_metric);
  569                         hwmp_recv_rann(vap, ni, wh, &rann);
  570                         found++;
  571                         break;
  572                 }
  573                 }
  574                 iefrm += iefrm[1] + 2;
  575         }
  576         if (!found) {
  577                 IEEE80211_DISCARD(vap,
  578                     IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
  579                     wh, NULL, "%s", "PATH SEL action without IE");
  580                 vap->iv_stats.is_rx_mgtdiscard++;
  581         }
  582         return 0;
  583 }
  584 
  585 static int
  586 hwmp_send_action(struct ieee80211vap *vap,
  587     const uint8_t da[IEEE80211_ADDR_LEN],
  588     uint8_t *ie, size_t len)
  589 {
  590         struct ieee80211_node *ni;
  591         struct ieee80211com *ic;
  592         struct ieee80211_bpf_params params;
  593         struct mbuf *m;
  594         uint8_t *frm;
  595         int ret;
  596 
  597         if (IEEE80211_IS_MULTICAST(da)) {
  598                 ni = ieee80211_ref_node(vap->iv_bss);
  599 #ifdef IEEE80211_DEBUG_REFCNT
  600                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
  601                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
  602                 __func__, __LINE__,
  603                 ni, ether_sprintf(ni->ni_macaddr),
  604                 ieee80211_node_refcnt(ni)+1);
  605 #endif
  606                 ieee80211_ref_node(ni);
  607         }
  608         else
  609                 ni = ieee80211_mesh_find_txnode(vap, da);
  610 
  611         if (vap->iv_state == IEEE80211_S_CAC) {
  612                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
  613                     "block %s frame in CAC state", "HWMP action");
  614                 vap->iv_stats.is_tx_badstate++;
  615                 return EIO;     /* XXX */
  616         }
  617 
  618         KASSERT(ni != NULL, ("null node"));
  619         ic = ni->ni_ic;
  620 
  621         m = ieee80211_getmgtframe(&frm,
  622             ic->ic_headroom + sizeof(struct ieee80211_frame),
  623             sizeof(struct ieee80211_action) + len
  624         );
  625         if (m == NULL) {
  626                 ieee80211_free_node(ni);
  627                 vap->iv_stats.is_tx_nobuf++;
  628                 return ENOMEM;
  629         }
  630         *frm++ = IEEE80211_ACTION_CAT_MESH;
  631         *frm++ = IEEE80211_ACTION_MESH_HWMP;
  632         switch (*ie) {
  633         case IEEE80211_ELEMID_MESHPREQ:
  634                 frm = hwmp_add_meshpreq(frm,
  635                     (struct ieee80211_meshpreq_ie *)ie);
  636                 break;
  637         case IEEE80211_ELEMID_MESHPREP:
  638                 frm = hwmp_add_meshprep(frm,
  639                     (struct ieee80211_meshprep_ie *)ie);
  640                 break;
  641         case IEEE80211_ELEMID_MESHPERR:
  642                 frm = hwmp_add_meshperr(frm,
  643                     (struct ieee80211_meshperr_ie *)ie);
  644                 break;
  645         case IEEE80211_ELEMID_MESHRANN:
  646                 frm = hwmp_add_meshrann(frm,
  647                     (struct ieee80211_meshrann_ie *)ie);
  648                 break;
  649         }
  650 
  651         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
  652         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
  653         if (m == NULL) {
  654                 ieee80211_free_node(ni);
  655                 vap->iv_stats.is_tx_nobuf++;
  656                 return ENOMEM;
  657         }
  658 
  659         IEEE80211_TX_LOCK(ic);
  660 
  661         ieee80211_send_setup(ni, m,
  662             IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
  663             IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
  664 
  665         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  666         IEEE80211_NODE_STAT(ni, tx_mgmt);
  667 
  668         memset(&params, 0, sizeof(params));
  669         params.ibp_pri = WME_AC_VO;
  670         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
  671         if (IEEE80211_IS_MULTICAST(da))
  672                 params.ibp_try0 = 1;
  673         else
  674                 params.ibp_try0 = ni->ni_txparms->maxretry;
  675         params.ibp_power = ni->ni_txpower;
  676         ret = ieee80211_raw_output(vap, ni, m, &params);
  677         IEEE80211_TX_UNLOCK(ic);
  678         return (ret);
  679 }
  680 
  681 #define ADDSHORT(frm, v) do {           \
  682         frm[0] = (v) & 0xff;            \
  683         frm[1] = (v) >> 8;              \
  684         frm += 2;                       \
  685 } while (0)
  686 #define ADDWORD(frm, v) do {            \
  687         LE_WRITE_4(frm, v);             \
  688         frm += 4;                       \
  689 } while (0)
  690 /*
  691  * Add a Mesh Path Request IE to a frame.
  692  */
  693 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
  694 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
  695 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
  696 static uint8_t *
  697 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
  698 {
  699         int i;
  700 
  701         *frm++ = IEEE80211_ELEMID_MESHPREQ;
  702         *frm++ = preq->preq_len;        /* len already calculated */
  703         *frm++ = preq->preq_flags;
  704         *frm++ = preq->preq_hopcount;
  705         *frm++ = preq->preq_ttl;
  706         ADDWORD(frm, preq->preq_id);
  707         IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
  708         ADDWORD(frm, preq->preq_origseq);
  709         if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
  710                 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
  711                 frm += 6;
  712         }
  713         ADDWORD(frm, preq->preq_lifetime);
  714         ADDWORD(frm, preq->preq_metric);
  715         *frm++ = preq->preq_tcount;
  716         for (i = 0; i < preq->preq_tcount; i++) {
  717                 *frm++ = PREQ_TFLAGS(i);
  718                 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
  719                 frm += 6;
  720                 ADDWORD(frm, PREQ_TSEQ(i));
  721         }
  722         return frm;
  723 }
  724 #undef  PREQ_TFLAGS
  725 #undef  PREQ_TADDR
  726 #undef  PREQ_TSEQ
  727 
  728 /*
  729  * Add a Mesh Path Reply IE to a frame.
  730  */
  731 static uint8_t *
  732 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
  733 {
  734         *frm++ = IEEE80211_ELEMID_MESHPREP;
  735         *frm++ = prep->prep_len;        /* len already calculated */
  736         *frm++ = prep->prep_flags;
  737         *frm++ = prep->prep_hopcount;
  738         *frm++ = prep->prep_ttl;
  739         IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
  740         ADDWORD(frm, prep->prep_targetseq);
  741         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
  742                 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
  743                 frm += 6;
  744         }
  745         ADDWORD(frm, prep->prep_lifetime);
  746         ADDWORD(frm, prep->prep_metric);
  747         IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
  748         ADDWORD(frm, prep->prep_origseq);
  749         return frm;
  750 }
  751 
  752 /*
  753  * Add a Mesh Path Error IE to a frame.
  754  */
  755 #define PERR_DFLAGS(n)  perr->perr_dests[n].dest_flags
  756 #define PERR_DADDR(n)   perr->perr_dests[n].dest_addr
  757 #define PERR_DSEQ(n)    perr->perr_dests[n].dest_seq
  758 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
  759 #define PERR_DRCODE(n)  perr->perr_dests[n].dest_rcode
  760 static uint8_t *
  761 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
  762 {
  763         int i;
  764 
  765         *frm++ = IEEE80211_ELEMID_MESHPERR;
  766         *frm++ = perr->perr_len;        /* len already calculated */
  767         *frm++ = perr->perr_ttl;
  768         *frm++ = perr->perr_ndests;
  769         for (i = 0; i < perr->perr_ndests; i++) {
  770                 *frm++ = PERR_DFLAGS(i);
  771                 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
  772                 frm += 6;
  773                 ADDWORD(frm, PERR_DSEQ(i));
  774                 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
  775                         IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
  776                         frm += 6;
  777                 }
  778                 ADDSHORT(frm, PERR_DRCODE(i));
  779         }
  780         return frm;
  781 }
  782 #undef  PERR_DFLAGS
  783 #undef  PERR_DADDR
  784 #undef  PERR_DSEQ
  785 #undef  PERR_EXTADDR
  786 #undef  PERR_DRCODE
  787 
  788 /*
  789  * Add a Root Annoucement IE to a frame.
  790  */
  791 static uint8_t *
  792 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
  793 {
  794         *frm++ = IEEE80211_ELEMID_MESHRANN;
  795         *frm++ = rann->rann_len;
  796         *frm++ = rann->rann_flags;
  797         *frm++ = rann->rann_hopcount;
  798         *frm++ = rann->rann_ttl;
  799         IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
  800         ADDWORD(frm, rann->rann_seq);
  801         ADDWORD(frm, rann->rann_interval);
  802         ADDWORD(frm, rann->rann_metric);
  803         return frm;
  804 }
  805 
  806 static void
  807 hwmp_rootmode_setup(struct ieee80211vap *vap)
  808 {
  809         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  810         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  811 
  812         switch (hs->hs_rootmode) {
  813         case IEEE80211_HWMP_ROOTMODE_DISABLED:
  814                 callout_drain(&hs->hs_roottimer);
  815                 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
  816                 break;
  817         case IEEE80211_HWMP_ROOTMODE_NORMAL:
  818         case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
  819                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
  820                     hwmp_rootmode_cb, vap);
  821                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
  822                 break;
  823         case IEEE80211_HWMP_ROOTMODE_RANN:
  824                 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
  825                     hwmp_rootmode_rann_cb, vap);
  826                 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
  827                 break;
  828         }
  829 }
  830 
  831 /*
  832  * Send a broadcast Path Request to find all nodes on the mesh. We are
  833  * called when the vap is configured as a HWMP root node.
  834  */
  835 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
  836 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
  837 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
  838 static void
  839 hwmp_rootmode_cb(void *arg)
  840 {
  841         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
  842         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  843         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  844         struct ieee80211_meshpreq_ie preq;
  845 
  846         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
  847             "%s", "send broadcast PREQ");
  848 
  849         preq.preq_flags = 0;
  850         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
  851                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
  852         if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
  853                 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
  854         preq.preq_hopcount = 0;
  855         preq.preq_ttl = ms->ms_ttl;
  856         preq.preq_id = ++hs->hs_preqid;
  857         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
  858         preq.preq_origseq = ++hs->hs_seq;
  859         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
  860         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
  861         preq.preq_tcount = 1;
  862         IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
  863         PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
  864             IEEE80211_MESHPREQ_TFLAGS_USN;
  865         PREQ_TSEQ(0) = 0;
  866         vap->iv_stats.is_hwmp_rootreqs++;
  867         /* NB: we enforce rate check ourself */
  868         hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
  869         hwmp_rootmode_setup(vap);
  870 }
  871 #undef  PREQ_TFLAGS
  872 #undef  PREQ_TADDR
  873 #undef  PREQ_TSEQ
  874 
  875 /*
  876  * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
  877  * called when the vap is configured as a HWMP RANN root node.
  878  */
  879 static void
  880 hwmp_rootmode_rann_cb(void *arg)
  881 {
  882         struct ieee80211vap *vap = (struct ieee80211vap *)arg;
  883         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  884         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  885         struct ieee80211_meshrann_ie rann;
  886 
  887         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
  888             "%s", "send broadcast RANN");
  889 
  890         rann.rann_flags = 0;
  891         if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
  892                 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
  893         rann.rann_hopcount = 0;
  894         rann.rann_ttl = ms->ms_ttl;
  895         IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
  896         rann.rann_seq = ++hs->hs_seq;
  897         rann.rann_interval = ieee80211_hwmp_rannint;
  898         rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
  899 
  900         vap->iv_stats.is_hwmp_rootrann++;
  901         hwmp_send_rann(vap, broadcastaddr, &rann);
  902         hwmp_rootmode_setup(vap);
  903 }
  904 
  905 /*
  906  * Update forwarding information to TA if metric improves.
  907  */
  908 static void
  909 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
  910     const char *hwmp_frame)
  911 {
  912         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  913         struct ieee80211_mesh_route *rttran = NULL;     /* Transmitter */
  914         int metric = 0;
  915 
  916         rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
  917         if (rttran == NULL) {
  918                 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
  919                 if (rttran == NULL) {
  920                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  921                             "unable to add path to transmitter %6D of %s",
  922                             ni->ni_macaddr, ":", hwmp_frame);
  923                         vap->iv_stats.is_mesh_rtaddfailed++;
  924                         return;
  925                 }
  926         }
  927         metric = ms->ms_pmetric->mpm_metric(ni);
  928         if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
  929             rttran->rt_metric > metric)
  930         {
  931                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  932                     "%s path to transmiter %6D of %s, metric %d:%d",
  933                     rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
  934                     "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
  935                     rttran->rt_metric, metric);
  936                 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
  937                 rttran->rt_metric = metric;
  938                 rttran->rt_nhops  = 1;
  939                 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
  940                 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
  941         }
  942 }
  943 
  944 #define PREQ_TFLAGS(n)  preq->preq_targets[n].target_flags
  945 #define PREQ_TADDR(n)   preq->preq_targets[n].target_addr
  946 #define PREQ_TSEQ(n)    preq->preq_targets[n].target_seq
  947 static void
  948 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
  949     const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
  950 {
  951         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  952         struct ieee80211_mesh_route *rtorig = NULL;
  953         struct ieee80211_mesh_route *rtorig_ext = NULL;
  954         struct ieee80211_mesh_route *rttarg = NULL;
  955         struct ieee80211_hwmp_route *hrorig = NULL;
  956         struct ieee80211_hwmp_route *hrtarg = NULL;
  957         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
  958         struct ieee80211_meshprep_ie prep;
  959         ieee80211_hwmp_seq preqid;      /* last seen preqid for orig */
  960         uint32_t metric = 0;
  961 
  962         /*
  963          * Ignore PREQs from us. Could happen because someone forward it
  964          * back to us.
  965          */
  966         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
  967                 return;
  968 
  969         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
  970             "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
  971             PREQ_TADDR(0), ":");
  972 
  973         /*
  974          * Acceptance criteria: (if the PREQ is not for us or not broadcast,
  975          * or an external mac address not proxied by us),
  976          * AND forwarding is disabled, discard this PREQ.
  977          */
  978         rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
  979         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
  980             (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
  981             !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
  982             (rttarg != NULL &&
  983             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
  984             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
  985                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
  986                     preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
  987                 return;
  988         }
  989         /*
  990          * Acceptance criteria: if unicast addressed 
  991          * AND no valid forwarding for Target of PREQ, discard this PREQ.
  992          */
  993         if(rttarg != NULL)
  994                 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
  995                     struct ieee80211_hwmp_route);
  996         /* Address mode: ucast */
  997         if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
  998             rttarg == NULL &&
  999             !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
 1000                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 1001                     preq->preq_origaddr, NULL,
 1002                     "unicast addressed PREQ of unknown target %6D",
 1003                     PREQ_TADDR(0), ":");
 1004                 return;
 1005         }
 1006 
 1007         /* PREQ ACCEPTED */
 1008 
 1009         rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
 1010         if (rtorig == NULL) {
 1011                 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
 1012                 if (rtorig == NULL) {
 1013                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1014                             "unable to add orig path to %6D",
 1015                             preq->preq_origaddr, ":");
 1016                         vap->iv_stats.is_mesh_rtaddfailed++;
 1017                         return;
 1018                 }
 1019                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1020                     "adding originator %6D", preq->preq_origaddr, ":");
 1021         }
 1022         hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
 1023 
 1024         /* record last seen preqid */
 1025         preqid = hrorig->hr_preqid;
 1026         hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
 1027 
 1028         /* Data creation and update of forwarding information
 1029          * according to Table 11C-8 for originator mesh STA.
 1030          */
 1031         metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
 1032         if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
 1033             (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
 1034             metric < rtorig->rt_metric)) {
 1035                 hrorig->hr_seq = preq->preq_origseq;
 1036                 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
 1037                 rtorig->rt_metric = metric;
 1038                 rtorig->rt_nhops  = preq->preq_hopcount + 1;
 1039                 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
 1040                 /* Path to orig is valid now.
 1041                  * NB: we know it can't be Proxy, and if it is GATE
 1042                  * it will be marked below.
 1043                  */
 1044                 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
 1045         } else if ((hrtarg != NULL &&
 1046             !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
 1047             (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1048             preqid >= preq->preq_id)) {
 1049                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1050                     "discard PREQ from %6D, old seqno %u <= %u,"
 1051                     " or old preqid %u < %u",
 1052                     preq->preq_origaddr, ":",
 1053                     preq->preq_origseq, hrorig->hr_seq,
 1054                     preq->preq_id, preqid);
 1055                 return;
 1056         }
 1057 
 1058         /* Update forwarding information to TA if metric improves. */
 1059         hwmp_update_transmitter(vap, ni, "PREQ");
 1060 
 1061         /*
 1062          * Check if the PREQ is addressed to us.
 1063          * or a Proxy currently gated by us.
 1064          */
 1065         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
 1066             (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
 1067             rttarg != NULL &&
 1068             IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
 1069             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
 1070             rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
 1071                 /*
 1072                  * When we are the target we shall update our own HWMP seq
 1073                  * number with max of (current and preq->seq) + 1
 1074                  */
 1075                 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
 1076 
 1077                 prep.prep_flags = 0;
 1078                 prep.prep_hopcount = 0;
 1079                 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1080                 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
 1081                 if (rttarg != NULL && /* if NULL it means we are the target */
 1082                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
 1083                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1084                             "reply for proxy %6D", rttarg->rt_dest, ":");
 1085                         prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
 1086                         IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
 1087                             rttarg->rt_dest);
 1088                         /* update proxy seqno to HWMP seqno */
 1089                         rttarg->rt_ext_seq = hs->hs_seq;
 1090                         prep.prep_hopcount = rttarg->rt_nhops;
 1091                         prep.prep_metric = rttarg->rt_metric;
 1092                         IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
 1093                 }
 1094                 /*
 1095                  * Build and send a PREP frame.
 1096                  */
 1097                 prep.prep_ttl = ms->ms_ttl;
 1098                 prep.prep_targetseq = hs->hs_seq;
 1099                 prep.prep_lifetime = preq->preq_lifetime;
 1100                 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
 1101                 prep.prep_origseq = preq->preq_origseq;
 1102 
 1103                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1104                     "reply to %6D", preq->preq_origaddr, ":");
 1105                 hwmp_send_prep(vap, wh->i_addr2, &prep);
 1106                 return;
 1107         }
 1108         /* we may update our proxy information for the orig external */
 1109         else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
 1110                 rtorig_ext =
 1111                     ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
 1112                 if (rtorig_ext == NULL) {
 1113                         rtorig_ext = ieee80211_mesh_rt_add(vap,
 1114                             preq->preq_orig_ext_addr);
 1115                         if (rtorig_ext == NULL) {
 1116                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1117                                     "unable to add orig ext proxy to %6D",
 1118                                     preq->preq_orig_ext_addr, ":");
 1119                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1120                                 return;
 1121                         }
 1122                         IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
 1123                             preq->preq_origaddr);
 1124                 }
 1125                 rtorig_ext->rt_ext_seq = preq->preq_origseq;
 1126                 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
 1127         }
 1128         /*
 1129          * Proactive PREQ: reply with a proactive PREP to the
 1130          * root STA if requested.
 1131          */
 1132         if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
 1133             (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
 1134                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1135                     "root mesh station @ %6D", preq->preq_origaddr, ":");
 1136 
 1137                 /* Check if root is a mesh gate, mark it */
 1138                 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
 1139                         struct ieee80211_mesh_gate_route *gr;
 1140 
 1141                         rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
 1142                         gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
 1143                             rtorig);
 1144                         gr->gr_lastseq = 0; /* NOT GANN */
 1145                 }
 1146 
 1147                 /*
 1148                  * Reply with a PREP if we don't have a path to the root
 1149                  * or if the root sent us a proactive PREQ.
 1150                  */
 1151                 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
 1152                     (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
 1153                         prep.prep_flags = 0;
 1154                         prep.prep_hopcount = 0;
 1155                         prep.prep_ttl = ms->ms_ttl;
 1156                         IEEE80211_ADDR_COPY(prep.prep_origaddr,
 1157                             preq->preq_origaddr);
 1158                         prep.prep_origseq = preq->preq_origseq;
 1159                         prep.prep_lifetime = preq->preq_lifetime;
 1160                         prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1161                         IEEE80211_ADDR_COPY(prep.prep_targetaddr,
 1162                             vap->iv_myaddr);
 1163                         prep.prep_targetseq = ++hs->hs_seq;
 1164                         hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
 1165                 }
 1166         }
 1167 
 1168         /*
 1169          * Forwarding and Intermediate reply for PREQs with 1 target.
 1170          */
 1171         if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
 1172             (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
 1173                 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
 1174 
 1175                 memcpy(&ppreq, preq, sizeof(ppreq));
 1176 
 1177                 /*
 1178                  * We have a valid route to this node.
 1179                  * NB: if target is proxy dont reply.
 1180                  */
 1181                 if (rttarg != NULL &&
 1182                     rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1183                     !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
 1184                         /*
 1185                          * Check if we can send an intermediate Path Reply,
 1186                          * i.e., Target Only bit is not set and target is not
 1187                          * the MAC broadcast address.
 1188                          */
 1189                         if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
 1190                             !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
 1191                                 struct ieee80211_meshprep_ie prep;
 1192 
 1193                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1194                                     "intermediate reply for PREQ from %6D",
 1195                                     preq->preq_origaddr, ":");
 1196                                 prep.prep_flags = 0;
 1197                                 prep.prep_hopcount = rttarg->rt_nhops;
 1198                                 prep.prep_ttl = ms->ms_ttl;
 1199                                 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
 1200                                     PREQ_TADDR(0));
 1201                                 prep.prep_targetseq = hrtarg->hr_seq;
 1202                                 prep.prep_lifetime = preq->preq_lifetime;
 1203                                 prep.prep_metric =rttarg->rt_metric;
 1204                                 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
 1205                                     preq->preq_origaddr);
 1206                                 prep.prep_origseq = hrorig->hr_seq;
 1207                                 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
 1208 
 1209                                 /*
 1210                                  * Set TO and unset RF bits because we have
 1211                                  * sent a PREP.
 1212                                  */
 1213                                 ppreq.preq_targets[0].target_flags |=
 1214                                     IEEE80211_MESHPREQ_TFLAGS_TO;
 1215                         }
 1216                 }
 1217 
 1218                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1219                     "forward PREQ from %6D",
 1220                     preq->preq_origaddr, ":");
 1221                 ppreq.preq_hopcount += 1;
 1222                 ppreq.preq_ttl -= 1;
 1223                 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
 1224 
 1225                 /* don't do PREQ ratecheck when we propagate */
 1226                 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
 1227         }
 1228 }
 1229 #undef  PREQ_TFLAGS
 1230 #undef  PREQ_TADDR
 1231 #undef  PREQ_TSEQ
 1232 
 1233 static int
 1234 hwmp_send_preq(struct ieee80211vap *vap,
 1235     const uint8_t da[IEEE80211_ADDR_LEN],
 1236     struct ieee80211_meshpreq_ie *preq,
 1237     struct timeval *last, struct timeval *minint)
 1238 {
 1239 
 1240         /*
 1241          * Enforce PREQ interval.
 1242          * NB: Proactive ROOT PREQs rate is handled by cb task.
 1243          */
 1244         if (last != NULL && minint != NULL) {
 1245                 if (ratecheck(last, minint) == 0)
 1246                         return EALREADY; /* XXX: we should postpone */
 1247                 getmicrouptime(last);
 1248         }
 1249 
 1250         /*
 1251          * mesh preq action frame format
 1252          *     [6] da
 1253          *     [6] sa
 1254          *     [6] addr3 = sa
 1255          *     [1] action
 1256          *     [1] category
 1257          *     [tlv] mesh path request
 1258          */
 1259         preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
 1260         preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
 1261             IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
 1262             preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
 1263         return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
 1264 }
 1265 
 1266 static void
 1267 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1268     const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
 1269 {
 1270 #define IS_PROXY(rt)    (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
 1271 #define PROXIED_BY_US(rt)               \
 1272     (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
 1273         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1274         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1275         struct ieee80211_mesh_route *rt = NULL;
 1276         struct ieee80211_mesh_route *rtorig = NULL;
 1277         struct ieee80211_mesh_route *rtext = NULL;
 1278         struct ieee80211_hwmp_route *hr;
 1279         struct ieee80211com *ic = vap->iv_ic;
 1280         struct mbuf *m, *next;
 1281         uint32_t metric = 0;
 1282         const uint8_t *addr;
 1283 
 1284         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1285             "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
 1286             prep->prep_targetaddr, ":");
 1287 
 1288         /*
 1289          * Acceptance criteria: (If the corresponding PREP was not generated
 1290          * by us OR not generated by an external mac that is not proxied by us)
 1291          * AND forwarding is disabled, discard this PREP.
 1292          */
 1293         rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
 1294         if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
 1295             (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
 1296             !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
 1297                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1298                     "discard PREP, orig(%6D) not proxied or generated by us",
 1299                     prep->prep_origaddr, ":");
 1300                 return;
 1301         }
 1302 
 1303         /* PREP ACCEPTED */
 1304 
 1305         /*
 1306          * If accepted shall create or update the active forwarding information
 1307          * it maintains for the target mesh STA of the PREP (according to the
 1308          * rules defined in 13.10.8.4). If the conditions for creating or
 1309          * updating the forwarding information have not been met in those
 1310          * rules, no further steps are applied to the PREP.
 1311          */
 1312         rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
 1313         if (rt == NULL) {
 1314                 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
 1315                 if (rt == NULL) {
 1316                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1317                             "unable to add PREP path to %6D",
 1318                             prep->prep_targetaddr, ":");
 1319                         vap->iv_stats.is_mesh_rtaddfailed++;
 1320                         return;
 1321                 }
 1322                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1323                     "adding target %6D", prep->prep_targetaddr, ":");
 1324         }
 1325         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1326         /* update path metric */
 1327         metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
 1328         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
 1329                 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
 1330                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1331                             "discard PREP from %6D, old seq no %u < %u",
 1332                             prep->prep_targetaddr, ":",
 1333                             prep->prep_targetseq, hr->hr_seq);
 1334                         return;
 1335                 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
 1336                     metric > rt->rt_metric) {
 1337                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1338                             "discard PREP from %6D, new metric %u > %u",
 1339                             prep->prep_targetaddr, ":",
 1340                             metric, rt->rt_metric);
 1341                         return;
 1342                 }
 1343         }
 1344 
 1345         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1346             "%s path to %6D, hopcount %d:%d metric %d:%d",
 1347             rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
 1348             "prefer" : "update",
 1349             prep->prep_targetaddr, ":",
 1350             rt->rt_nhops, prep->prep_hopcount + 1,
 1351             rt->rt_metric, metric);
 1352 
 1353         hr->hr_seq = prep->prep_targetseq;
 1354         hr->hr_preqretries = 0;
 1355         IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
 1356         rt->rt_metric = metric;
 1357         rt->rt_nhops = prep->prep_hopcount + 1;
 1358         ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
 1359         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
 1360                 /* discovery complete */
 1361                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
 1362         }
 1363         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
 1364 
 1365         /* Update forwarding information to TA if metric improves */
 1366         hwmp_update_transmitter(vap, ni, "PREP");
 1367 
 1368         /*
 1369          * If it's NOT for us, propagate the PREP
 1370          */
 1371         if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
 1372             prep->prep_ttl > 1 &&
 1373             prep->prep_hopcount < hs->hs_maxhops) {
 1374                 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
 1375                 /*
 1376                  * NB: We should already have setup the path to orig
 1377                  * mesh STA when we propagated PREQ to target mesh STA,
 1378                  * no PREP is generated without a corresponding PREQ.
 1379                  * XXX: for now just ignore.
 1380                  */
 1381                 if (rtorig == NULL) {
 1382                         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1383                             "received PREP for an unknown orig(%6D)",
 1384                             prep->prep_origaddr, ":");
 1385                         return;
 1386                 }
 1387 
 1388                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1389                     "propagate PREP from %6D",
 1390                     prep->prep_targetaddr, ":");
 1391 
 1392                 memcpy(&pprep, prep, sizeof(pprep));
 1393                 pprep.prep_hopcount += 1;
 1394                 pprep.prep_ttl -= 1;
 1395                 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
 1396                 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
 1397 
 1398                 /* precursor list for the Target Mesh STA Address is updated */
 1399         }
 1400 
 1401         /*
 1402          * Check if we received a PREP w/ AE and store target external address.
 1403          * We may store target external address if recevied PREP w/ AE
 1404          * and we are not final destination
 1405          */
 1406         if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
 1407                 rtext = ieee80211_mesh_rt_find(vap,
 1408                         prep->prep_target_ext_addr);
 1409                 if (rtext == NULL) {
 1410                         rtext = ieee80211_mesh_rt_add(vap,
 1411                                 prep->prep_target_ext_addr);
 1412                         if (rtext == NULL) {
 1413                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1414                                     "unable to add PREP path to proxy %6D",
 1415                                     prep->prep_targetaddr, ":");
 1416                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1417                                 return;
 1418                         }
 1419                 }
 1420                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1421                     "%s path to %6D, hopcount %d:%d metric %d:%d",
 1422                     rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
 1423                     "prefer" : "update",
 1424                     prep->prep_target_ext_addr, ":",
 1425                     rtext->rt_nhops, prep->prep_hopcount + 1,
 1426                     rtext->rt_metric, metric);
 1427 
 1428                 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
 1429                         IEEE80211_MESHRT_FLAGS_VALID;
 1430                 IEEE80211_ADDR_COPY(rtext->rt_dest,
 1431                     prep->prep_target_ext_addr);
 1432                 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
 1433                     prep->prep_targetaddr);
 1434                 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
 1435                 rtext->rt_metric = metric;
 1436                 rtext->rt_lifetime = prep->prep_lifetime;
 1437                 rtext->rt_nhops = prep->prep_hopcount + 1;
 1438                 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
 1439                 /*
 1440                  * XXX: proxy entries have no HWMP priv data,
 1441                  * nullify them to be sure?
 1442                  */
 1443         }
 1444         /*
 1445          * Check for frames queued awaiting path discovery.
 1446          * XXX probably can tell exactly and avoid remove call
 1447          * NB: hash may have false matches, if so they will get
 1448          *     stuck back on the stageq because there won't be
 1449          *     a path.
 1450          */
 1451         addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
 1452             prep->prep_target_ext_addr : prep->prep_targetaddr;
 1453         m = ieee80211_ageq_remove(&ic->ic_stageq,
 1454             (struct ieee80211_node *)(uintptr_t)
 1455             ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
 1456 
 1457         /*
 1458          * All frames in the stageq here should be non-M_ENCAP; or things
 1459          * will get very unhappy.
 1460          */
 1461         for (; m != NULL; m = next) {
 1462                 next = m->m_nextpkt;
 1463                 m->m_nextpkt = NULL;
 1464                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1465                     "flush queued frame %p len %d", m, m->m_pkthdr.len);
 1466                 /*
 1467                  * If the mbuf has M_ENCAP set, ensure we free it.
 1468                  * Note that after if_transmit() is called, m is invalid.
 1469                  */
 1470                 (void) ieee80211_vap_xmitpkt(vap, m);
 1471         }
 1472 #undef  IS_PROXY
 1473 #undef  PROXIED_BY_US
 1474 }
 1475 
 1476 static int
 1477 hwmp_send_prep(struct ieee80211vap *vap,
 1478     const uint8_t da[IEEE80211_ADDR_LEN],
 1479     struct ieee80211_meshprep_ie *prep)
 1480 {
 1481         /* NB: there's no PREP minimum interval. */
 1482 
 1483         /*
 1484          * mesh prep action frame format
 1485          *     [6] da
 1486          *     [6] sa
 1487          *     [6] addr3 = sa
 1488          *     [1] action
 1489          *     [1] category
 1490          *     [tlv] mesh path reply
 1491          */
 1492         prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
 1493         prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
 1494             IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
 1495         return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
 1496 }
 1497 
 1498 #define PERR_DFLAGS(n)  perr.perr_dests[n].dest_flags
 1499 #define PERR_DADDR(n)   perr.perr_dests[n].dest_addr
 1500 #define PERR_DSEQ(n)    perr.perr_dests[n].dest_seq
 1501 #define PERR_DRCODE(n)  perr.perr_dests[n].dest_rcode
 1502 static void
 1503 hwmp_peerdown(struct ieee80211_node *ni)
 1504 {
 1505         struct ieee80211vap *vap = ni->ni_vap;
 1506         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1507         struct ieee80211_meshperr_ie perr;
 1508         struct ieee80211_mesh_route *rt;
 1509         struct ieee80211_hwmp_route *hr;
 1510 
 1511         rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
 1512         if (rt == NULL)
 1513                 return;
 1514         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1515         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1516             "%s", "delete route entry");
 1517         perr.perr_ttl = ms->ms_ttl;
 1518         perr.perr_ndests = 1;
 1519         PERR_DFLAGS(0) = 0;
 1520         if (hr->hr_seq == 0)
 1521                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
 1522         PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
 1523         IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
 1524         PERR_DSEQ(0) = ++hr->hr_seq;
 1525         PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
 1526         /* NB: flush everything passing through peer */
 1527         ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
 1528         hwmp_send_perr(vap, broadcastaddr, &perr);
 1529 }
 1530 #undef  PERR_DFLAGS
 1531 #undef  PERR_DADDR
 1532 #undef  PERR_DSEQ
 1533 #undef  PERR_DRCODE
 1534 
 1535 #define PERR_DFLAGS(n)          perr->perr_dests[n].dest_flags
 1536 #define PERR_DADDR(n)           perr->perr_dests[n].dest_addr
 1537 #define PERR_DSEQ(n)            perr->perr_dests[n].dest_seq
 1538 #define PERR_DEXTADDR(n)        perr->perr_dests[n].dest_ext_addr
 1539 #define PERR_DRCODE(n)          perr->perr_dests[n].dest_rcode
 1540 static void
 1541 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1542     const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
 1543 {
 1544         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1545         struct ieee80211_mesh_route *rt = NULL;
 1546         struct ieee80211_mesh_route *rt_ext = NULL;
 1547         struct ieee80211_hwmp_route *hr;
 1548         struct ieee80211_meshperr_ie *pperr = NULL;
 1549         int i, j = 0, forward = 0;
 1550 
 1551         IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1552             "received PERR from %6D", wh->i_addr2, ":");
 1553 
 1554         /*
 1555          * if forwarding is true, prepare pperr
 1556          */
 1557         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
 1558                 forward = 1;
 1559                 pperr = malloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
 1560                     M_80211_MESH_PERR, M_NOWAIT); /* XXX: magic number, 32 err dests */
 1561         }
 1562 
 1563         /*
 1564          * Acceptance criteria: check if we have forwarding information
 1565          * stored about destination, and that nexthop == TA of this PERR.
 1566          * NB: we also build a new PERR to propagate in case we should forward.
 1567          */
 1568         for (i = 0; i < perr->perr_ndests; i++) {
 1569                 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
 1570                 if (rt == NULL)
 1571                         continue;
 1572                 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
 1573                         continue;
 1574 
 1575                 /* found and accepted a PERR ndest element, process it... */
 1576                 if (forward)
 1577                         memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
 1578                             sizeof(*perr->perr_dests));
 1579                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1580                 switch(PERR_DFLAGS(i)) {
 1581                 case (IEEE80211_REASON_MESH_PERR_NO_FI):
 1582                         if (PERR_DSEQ(i) == 0) {
 1583                                 hr->hr_seq++;
 1584                                 if (forward) {
 1585                                         pperr->perr_dests[j].dest_seq =
 1586                                             hr->hr_seq;
 1587                                 }
 1588                         } else {
 1589                                 hr->hr_seq = PERR_DSEQ(i);
 1590                         }
 1591                         rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
 1592                         j++;
 1593                         break;
 1594                 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
 1595                         if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
 1596                                 hr->hr_seq = PERR_DSEQ(i);
 1597                                 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
 1598                                 j++;
 1599                         }
 1600                         break;
 1601                 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
 1602                         rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
 1603                         if (rt_ext != NULL) {
 1604                                 rt_ext->rt_flags &=
 1605                                     ~IEEE80211_MESHRT_FLAGS_VALID;
 1606                                 j++;
 1607                         }
 1608                         break;
 1609                 default:
 1610                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1611                             "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
 1612                         goto done; /* XXX: stats?? */
 1613                 }
 1614                 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
 1615                 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
 1616         }
 1617         if (j == 0) {
 1618                 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
 1619                     "PERR not accepted");
 1620                 goto done; /* XXX: stats?? */
 1621         }
 1622 
 1623         /*
 1624          * Propagate the PERR if we previously found it on our routing table.
 1625          */
 1626         if (forward && perr->perr_ttl > 1) {
 1627                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
 1628                     "propagate PERR from %6D", wh->i_addr2, ":");
 1629                 pperr->perr_ndests = j;
 1630                 pperr->perr_ttl--;
 1631                 hwmp_send_perr(vap, broadcastaddr, pperr);
 1632         }
 1633 done:
 1634         if (pperr != NULL)
 1635                 free(pperr, M_80211_MESH_PERR);
 1636 }
 1637 #undef  PERR_DFLAGS
 1638 #undef  PERR_DADDR
 1639 #undef  PERR_DSEQ
 1640 #undef  PERR_DEXTADDR
 1641 #undef  PERR_DRCODE
 1642 
 1643 static int
 1644 hwmp_send_perr(struct ieee80211vap *vap,
 1645     const uint8_t da[IEEE80211_ADDR_LEN],
 1646     struct ieee80211_meshperr_ie *perr)
 1647 {
 1648         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1649         int i;
 1650         uint8_t length = 0;
 1651 
 1652         /*
 1653          * Enforce PERR interval.
 1654          */
 1655         if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
 1656                 return EALREADY;
 1657         getmicrouptime(&hs->hs_lastperr);
 1658 
 1659         /*
 1660          * mesh perr action frame format
 1661          *     [6] da
 1662          *     [6] sa
 1663          *     [6] addr3 = sa
 1664          *     [1] action
 1665          *     [1] category
 1666          *     [tlv] mesh path error
 1667          */
 1668         perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
 1669         length = IEEE80211_MESHPERR_BASE_SZ;
 1670         for (i = 0; i<perr->perr_ndests; i++) {
 1671                 if (perr->perr_dests[i].dest_flags &
 1672                     IEEE80211_MESHPERR_FLAGS_AE) {
 1673                         length += IEEE80211_MESHPERR_DEST_SZ_AE;
 1674                         continue ;
 1675                 }
 1676                 length += IEEE80211_MESHPERR_DEST_SZ;
 1677         }
 1678         perr->perr_len =length;
 1679         return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
 1680 }
 1681 
 1682 /*
 1683  * Called from the rest of the net80211 code (mesh code for example).
 1684  * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
 1685  * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
 1686  */
 1687 #define PERR_DFLAGS(n)          perr.perr_dests[n].dest_flags
 1688 #define PERR_DADDR(n)           perr.perr_dests[n].dest_addr
 1689 #define PERR_DSEQ(n)            perr.perr_dests[n].dest_seq
 1690 #define PERR_DEXTADDR(n)        perr.perr_dests[n].dest_ext_addr
 1691 #define PERR_DRCODE(n)          perr.perr_dests[n].dest_rcode
 1692 static void
 1693 hwmp_senderror(struct ieee80211vap *vap,
 1694     const uint8_t addr[IEEE80211_ADDR_LEN],
 1695     struct ieee80211_mesh_route *rt, int rcode)
 1696 {
 1697         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1698         struct ieee80211_hwmp_route *hr = NULL;
 1699         struct ieee80211_meshperr_ie perr;
 1700 
 1701         if (rt != NULL)
 1702                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
 1703                     struct ieee80211_hwmp_route);
 1704 
 1705         perr.perr_ndests = 1;
 1706         perr.perr_ttl = ms->ms_ttl;
 1707         PERR_DFLAGS(0) = 0;
 1708         PERR_DRCODE(0) = rcode;
 1709 
 1710         switch (rcode) {
 1711         case IEEE80211_REASON_MESH_PERR_NO_FI:
 1712                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
 1713                 PERR_DSEQ(0) = 0; /* reserved */
 1714                 break;
 1715         case IEEE80211_REASON_MESH_PERR_NO_PROXY:
 1716                 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
 1717                 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
 1718                     ("route is not marked proxy"));
 1719                 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
 1720                 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
 1721                 PERR_DSEQ(0) = rt->rt_ext_seq;
 1722                 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
 1723                 break;
 1724         case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
 1725                 KASSERT(rt != NULL, ("no route info for sending PERR"));
 1726                 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
 1727                 PERR_DSEQ(0) = hr->hr_seq;
 1728                 break;
 1729         default:
 1730                 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
 1731         }
 1732         hwmp_send_perr(vap, broadcastaddr, &perr);
 1733 }
 1734 #undef  PERR_DFLAGS
 1735 #undef  PEER_DADDR
 1736 #undef  PERR_DSEQ
 1737 #undef  PERR_DEXTADDR
 1738 #undef  PERR_DRCODE
 1739 
 1740 static void
 1741 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1742     const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
 1743 {
 1744         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1745         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1746         struct ieee80211_mesh_route *rt = NULL;
 1747         struct ieee80211_hwmp_route *hr;
 1748         struct ieee80211_meshpreq_ie preq;
 1749         struct ieee80211_meshrann_ie prann;
 1750         uint32_t metric = 0;
 1751 
 1752         if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
 1753                 return;
 1754 
 1755         rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
 1756         if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
 1757                 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1758 
 1759                 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
 1760                 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
 1761                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1762                         "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
 1763                         return;
 1764                 }
 1765 
 1766                 /* Acceptance criteria: if RANN.seq == stored seq AND
 1767                 * RANN.metric > stored metric, discard RANN */
 1768                 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
 1769                 rann->rann_metric > rt->rt_metric) {
 1770                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1771                         "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
 1772                         return;
 1773                 }
 1774         }
 1775 
 1776         /* RANN ACCEPTED */
 1777 
 1778         ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
 1779         metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni);
 1780 
 1781         if (rt == NULL) {
 1782                 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
 1783                 if (rt == NULL) {
 1784                         IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
 1785                             "unable to add mac for RANN root %6D",
 1786                             rann->rann_addr, ":");
 1787                             vap->iv_stats.is_mesh_rtaddfailed++;
 1788                         return;
 1789                 }
 1790         }
 1791         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1792         /* Check if root is a mesh gate, mark it */
 1793         if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
 1794                 struct ieee80211_mesh_gate_route *gr;
 1795 
 1796                 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
 1797                 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
 1798                         rt);
 1799                 gr->gr_lastseq = 0; /* NOT GANN */
 1800         }
 1801         /* discovery timeout */
 1802         ieee80211_mesh_rt_update(rt,
 1803             ticks_to_msecs(ieee80211_hwmp_roottimeout));
 1804 
 1805         preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
 1806         preq.preq_hopcount = 0;
 1807         preq.preq_ttl = ms->ms_ttl;
 1808         preq.preq_id = 0; /* reserved */
 1809         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1810         preq.preq_origseq = ++hs->hs_seq;
 1811         preq.preq_lifetime = ieee80211_hwmp_roottimeout;
 1812         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1813         preq.preq_tcount = 1;
 1814         preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
 1815         /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
 1816         IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
 1817         preq.preq_targets[0].target_seq = rann->rann_seq;
 1818         /* XXX: if rootconfint have not passed, we built this preq in vain */
 1819         hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
 1820             &ieee80211_hwmp_rootconfint);
 1821 
 1822         /* propagate a RANN */
 1823         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
 1824             rann->rann_ttl > 1 &&
 1825             ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
 1826                 hr->hr_seq = rann->rann_seq;
 1827                 memcpy(&prann, rann, sizeof(prann));
 1828                 prann.rann_hopcount += 1;
 1829                 prann.rann_ttl -= 1;
 1830                 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
 1831                 hwmp_send_rann(vap, broadcastaddr, &prann);
 1832         }
 1833 }
 1834 
 1835 static int
 1836 hwmp_send_rann(struct ieee80211vap *vap,
 1837     const uint8_t da[IEEE80211_ADDR_LEN],
 1838     struct ieee80211_meshrann_ie *rann)
 1839 {
 1840         /*
 1841          * mesh rann action frame format
 1842          *     [6] da
 1843          *     [6] sa
 1844          *     [6] addr3 = sa
 1845          *     [1] action
 1846          *     [1] category
 1847          *     [tlv] root annoucement
 1848          */
 1849         rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
 1850         rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
 1851         return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
 1852 }
 1853 
 1854 #define PREQ_TFLAGS(n)  preq.preq_targets[n].target_flags
 1855 #define PREQ_TADDR(n)   preq.preq_targets[n].target_addr
 1856 #define PREQ_TSEQ(n)    preq.preq_targets[n].target_seq
 1857 static void
 1858 hwmp_rediscover_cb(void *arg)
 1859 {
 1860         struct ieee80211_mesh_route *rt = arg;
 1861         struct ieee80211vap *vap = rt->rt_vap;
 1862         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1863         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1864         struct ieee80211_hwmp_route *hr;
 1865         struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
 1866 
 1867         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
 1868                 return ; /* nothing to do */
 1869 
 1870         hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
 1871         if (hr->hr_preqretries >=
 1872                 ieee80211_hwmp_maxpreq_retries) {
 1873                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
 1874                         rt->rt_dest, "%s",
 1875                         "max number of discovery, send queued frames to GATE");
 1876                 ieee80211_mesh_forward_to_gates(vap, rt);
 1877                 vap->iv_stats.is_mesh_fwd_nopath++;
 1878                 return ; /* XXX: flush queue? */
 1879         }
 1880 
 1881         hr->hr_preqretries++;
 1882 
 1883 
 1884         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
 1885             "start path rediscovery , target seq %u", hr->hr_seq);
 1886         /*
 1887          * Try to discover the path for this node.
 1888          * Group addressed PREQ Case A
 1889          */
 1890         preq.preq_flags = 0;
 1891         preq.preq_hopcount = 0;
 1892         preq.preq_ttl = ms->ms_ttl;
 1893         preq.preq_id = ++hs->hs_preqid;
 1894         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1895         preq.preq_origseq = hr->hr_origseq;
 1896         preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
 1897         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1898         preq.preq_tcount = 1;
 1899         IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
 1900         PREQ_TFLAGS(0) = 0;
 1901         if (ieee80211_hwmp_targetonly)
 1902                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
 1903         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
 1904         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
 1905         /* XXX check return value */
 1906         hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
 1907             &ieee80211_hwmp_preqminint);
 1908         callout_reset(&rt->rt_discovery,
 1909                 ieee80211_hwmp_net_diameter_traversaltime * 2,
 1910                 hwmp_rediscover_cb, rt);
 1911 }
 1912 
 1913 static struct ieee80211_node *
 1914 hwmp_discover(struct ieee80211vap *vap,
 1915     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
 1916 {
 1917         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 1918         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1919         struct ieee80211_mesh_route *rt = NULL;
 1920         struct ieee80211_hwmp_route *hr;
 1921         struct ieee80211_meshpreq_ie preq;
 1922         struct ieee80211_node *ni;
 1923         int sendpreq = 0;
 1924 
 1925         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
 1926             ("not a mesh vap, opmode %d", vap->iv_opmode));
 1927 
 1928         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
 1929             ("%s: discovering self!", __func__));
 1930 
 1931         ni = NULL;
 1932         if (!IEEE80211_IS_MULTICAST(dest)) {
 1933                 rt = ieee80211_mesh_rt_find(vap, dest);
 1934                 if (rt == NULL) {
 1935                         rt = ieee80211_mesh_rt_add(vap, dest);
 1936                         if (rt == NULL) {
 1937                                 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
 1938                                     ni, "unable to add discovery path to %6D",
 1939                                     dest, ":");
 1940                                 vap->iv_stats.is_mesh_rtaddfailed++;
 1941                                 goto done;
 1942                         }
 1943                 }
 1944                 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
 1945                     struct ieee80211_hwmp_route);
 1946                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
 1947                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 1948                             "%s", "already discovering queue frame until path found");
 1949                         sendpreq = 1;
 1950                         goto done;
 1951                 }
 1952                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
 1953                         if (hr->hr_lastdiscovery != 0 &&
 1954                             (ticks - hr->hr_lastdiscovery <
 1955                             (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
 1956                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1957                                     dest, NULL, "%s",
 1958                                     "too frequent discovery requeust");
 1959                                 sendpreq = 1;
 1960                                 goto done;
 1961                         }
 1962                         hr->hr_lastdiscovery = ticks;
 1963                         if (hr->hr_preqretries >=
 1964                             ieee80211_hwmp_maxpreq_retries) {
 1965                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1966                                     dest, NULL, "%s",
 1967                                     "no valid path , max number of discovery");
 1968                                 vap->iv_stats.is_mesh_fwd_nopath++;
 1969                                 goto done;
 1970                         }
 1971                         rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
 1972                         hr->hr_preqretries++;
 1973                         if (hr->hr_origseq == 0)
 1974                                 hr->hr_origseq = ++hs->hs_seq;
 1975                         rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1976                         sendpreq = 1;
 1977                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 1978                             "start path discovery (src %s), target seq %u",
 1979                             m == NULL ? "<none>" : ether_sprintf(
 1980                             mtod(m, struct ether_header *)->ether_shost),
 1981                             hr->hr_seq);
 1982                         /*
 1983                          * Try to discover the path for this node.
 1984                          * Group addressed PREQ Case A
 1985                          */
 1986                         preq.preq_flags = 0;
 1987                         preq.preq_hopcount = 0;
 1988                         preq.preq_ttl = ms->ms_ttl;
 1989                         preq.preq_id = ++hs->hs_preqid;
 1990                         IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
 1991                         preq.preq_origseq = hr->hr_origseq;
 1992                         preq.preq_lifetime =
 1993                             ticks_to_msecs(ieee80211_hwmp_pathtimeout);
 1994                         preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
 1995                         preq.preq_tcount = 1;
 1996                         IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
 1997                         PREQ_TFLAGS(0) = 0;
 1998                         if (ieee80211_hwmp_targetonly)
 1999                                 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
 2000                         PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
 2001                         PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
 2002                         /* XXX check return value */
 2003                         hwmp_send_preq(vap, broadcastaddr, &preq,
 2004                             &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
 2005                         callout_reset(&rt->rt_discovery,
 2006                             ieee80211_hwmp_net_diameter_traversaltime * 2,
 2007                             hwmp_rediscover_cb, rt);
 2008                 }
 2009                 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
 2010                         ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
 2011         } else {
 2012                 ni = ieee80211_find_txnode(vap, dest);
 2013                 /* NB: if null then we leak mbuf */
 2014                 KASSERT(ni != NULL, ("leak mcast frame"));
 2015                 return ni;
 2016         }
 2017 done:
 2018         if (ni == NULL && m != NULL) {
 2019                 if (sendpreq) {
 2020                         struct ieee80211com *ic = vap->iv_ic;
 2021                         /*
 2022                          * Queue packet for transmit when path discovery
 2023                          * completes.  If discovery never completes the
 2024                          * frame will be flushed by way of the aging timer.
 2025                          */
 2026                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
 2027                             "%s", "queue frame until path found");
 2028                         m->m_pkthdr.rcvif = (void *)(uintptr_t)
 2029                             ieee80211_mac_hash(ic, dest);
 2030                         /* XXX age chosen randomly */
 2031                         ieee80211_ageq_append(&ic->ic_stageq, m,
 2032                             IEEE80211_INACT_WAIT);
 2033                 } else {
 2034                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
 2035                             dest, NULL, "%s", "no valid path to this node");
 2036                         m_freem(m);
 2037                 }
 2038         }
 2039         return ni;
 2040 }
 2041 #undef  PREQ_TFLAGS
 2042 #undef  PREQ_TADDR
 2043 #undef  PREQ_TSEQ
 2044 
 2045 static int
 2046 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2047 {
 2048         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 2049         int error;
 2050 
 2051         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2052                 return ENOSYS;
 2053         error = 0;
 2054         switch (ireq->i_type) {
 2055         case IEEE80211_IOC_HWMP_ROOTMODE:
 2056                 ireq->i_val = hs->hs_rootmode;
 2057                 break;
 2058         case IEEE80211_IOC_HWMP_MAXHOPS:
 2059                 ireq->i_val = hs->hs_maxhops;
 2060                 break;
 2061         default:
 2062                 return ENOSYS;
 2063         }
 2064         return error;
 2065 }
 2066 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
 2067 
 2068 static int
 2069 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2070 {
 2071         struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
 2072         int error;
 2073 
 2074         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2075                 return ENOSYS;
 2076         error = 0;
 2077         switch (ireq->i_type) {
 2078         case IEEE80211_IOC_HWMP_ROOTMODE:
 2079                 if (ireq->i_val < 0 || ireq->i_val > 3)
 2080                         return EINVAL;
 2081                 hs->hs_rootmode = ireq->i_val;
 2082                 hwmp_rootmode_setup(vap);
 2083                 break;
 2084         case IEEE80211_IOC_HWMP_MAXHOPS:
 2085                 if (ireq->i_val <= 0 || ireq->i_val > 255)
 2086                         return EINVAL;
 2087                 hs->hs_maxhops = ireq->i_val;
 2088                 break;
 2089         default:
 2090                 return ENOSYS;
 2091         }
 2092         return error;
 2093 }
 2094 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);

Cache object: b097cbce0dad6fe41c02f8fdad286114


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