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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_mesh.c

Version: -  FREEBSD  -  FREEBSD11  -  FREEBSD10  -  FREEBSD9  -  FREEBSD92  -  FREEBSD91  -  FREEBSD90  -  FREEBSD8  -  FREEBSD82  -  FREEBSD81  -  FREEBSD80  -  FREEBSD7  -  FREEBSD74  -  FREEBSD73  -  FREEBSD72  -  FREEBSD71  -  FREEBSD70  -  FREEBSD6  -  FREEBSD64  -  FREEBSD63  -  FREEBSD62  -  FREEBSD61  -  FREEBSD60  -  FREEBSD5  -  FREEBSD55  -  FREEBSD54  -  FREEBSD53  -  FREEBSD52  -  FREEBSD51  -  FREEBSD50  -  FREEBSD4  -  FREEBSD3  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    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: stable/8/sys/net80211/ieee80211_mesh.c 217885 2011-01-26 16:59:07Z bschmidt $");
   32 #endif
   33 
   34 /*
   35  * IEEE 802.11s Mesh Point (MBSS) support.
   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 <net80211/ieee80211_var.h>
   61 #include <net80211/ieee80211_action.h>
   62 #include <net80211/ieee80211_input.h>
   63 #include <net80211/ieee80211_mesh.h>
   64 
   65 static void     mesh_rt_flush_invalid(struct ieee80211vap *);
   66 static int      mesh_select_proto_path(struct ieee80211vap *, const char *);
   67 static int      mesh_select_proto_metric(struct ieee80211vap *, const char *);
   68 static void     mesh_vattach(struct ieee80211vap *);
   69 static int      mesh_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   70 static void     mesh_rt_cleanup_cb(void *);
   71 static void     mesh_linkchange(struct ieee80211_node *,
   72                     enum ieee80211_mesh_mlstate);
   73 static void     mesh_checkid(void *, struct ieee80211_node *);
   74 static uint32_t mesh_generateid(struct ieee80211vap *);
   75 static int      mesh_checkpseq(struct ieee80211vap *,
   76                     const uint8_t [IEEE80211_ADDR_LEN], uint32_t);
   77 static struct ieee80211_node *
   78                 mesh_find_txnode(struct ieee80211vap *,
   79                     const uint8_t [IEEE80211_ADDR_LEN]);
   80 static void     mesh_forward(struct ieee80211vap *, struct mbuf *,
   81                     const struct ieee80211_meshcntl *);
   82 static int      mesh_input(struct ieee80211_node *, struct mbuf *, int, int);
   83 static void     mesh_recv_mgmt(struct ieee80211_node *, struct mbuf *, int,
   84                     int, int);
   85 static void     mesh_peer_timeout_setup(struct ieee80211_node *);
   86 static void     mesh_peer_timeout_backoff(struct ieee80211_node *);
   87 static void     mesh_peer_timeout_cb(void *);
   88 static __inline void
   89                 mesh_peer_timeout_stop(struct ieee80211_node *);
   90 static int      mesh_verify_meshid(struct ieee80211vap *, const uint8_t *);
   91 static int      mesh_verify_meshconf(struct ieee80211vap *, const uint8_t *);
   92 static int      mesh_verify_meshpeer(struct ieee80211vap *, uint8_t,
   93                     const uint8_t *);
   94 uint32_t        mesh_airtime_calc(struct ieee80211_node *);
   95 
   96 /*
   97  * Timeout values come from the specification and are in milliseconds.
   98  */
   99 SYSCTL_NODE(_net_wlan, OID_AUTO, mesh, CTLFLAG_RD, 0,
  100     "IEEE 802.11s parameters");
  101 static int ieee80211_mesh_retrytimeout = -1;
  102 SYSCTL_PROC(_net_wlan_mesh, OID_AUTO, retrytimeout, CTLTYPE_INT | CTLFLAG_RW,
  103     &ieee80211_mesh_retrytimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  104     "Retry timeout (msec)");
  105 static int ieee80211_mesh_holdingtimeout = -1;
  106 SYSCTL_PROC(_net_wlan_mesh, OID_AUTO, holdingtimeout, CTLTYPE_INT | CTLFLAG_RW,
  107     &ieee80211_mesh_holdingtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  108     "Holding state timeout (msec)");
  109 static int ieee80211_mesh_confirmtimeout = -1;
  110 SYSCTL_PROC(_net_wlan_mesh, OID_AUTO, confirmtimeout, CTLTYPE_INT | CTLFLAG_RW,
  111     &ieee80211_mesh_confirmtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
  112     "Confirm state timeout (msec)");
  113 static int ieee80211_mesh_maxretries = 2;
  114 SYSCTL_INT(_net_wlan_mesh, OID_AUTO, maxretries, CTLTYPE_INT | CTLFLAG_RW,
  115     &ieee80211_mesh_maxretries, 0,
  116     "Maximum retries during peer link establishment");
  117 
  118 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
  119         { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  120 
  121 static  ieee80211_recv_action_func mesh_recv_action_meshpeering_open;
  122 static  ieee80211_recv_action_func mesh_recv_action_meshpeering_confirm;
  123 static  ieee80211_recv_action_func mesh_recv_action_meshpeering_close;
  124 static  ieee80211_recv_action_func mesh_recv_action_meshlmetric_req;
  125 static  ieee80211_recv_action_func mesh_recv_action_meshlmetric_rep;
  126 
  127 static  ieee80211_send_action_func mesh_send_action_meshpeering_open;
  128 static  ieee80211_send_action_func mesh_send_action_meshpeering_confirm;
  129 static  ieee80211_send_action_func mesh_send_action_meshpeering_close;
  130 static  ieee80211_send_action_func mesh_send_action_meshlink_request;
  131 static  ieee80211_send_action_func mesh_send_action_meshlink_reply;
  132 
  133 static const struct ieee80211_mesh_proto_metric mesh_metric_airtime = {
  134         .mpm_descr      = "AIRTIME",
  135         .mpm_ie         = IEEE80211_MESHCONF_METRIC_AIRTIME,
  136         .mpm_metric     = mesh_airtime_calc,
  137 };
  138 
  139 static struct ieee80211_mesh_proto_path         mesh_proto_paths[4];
  140 static struct ieee80211_mesh_proto_metric       mesh_proto_metrics[4];
  141 
  142 #define MESH_RT_LOCK(ms)        mtx_lock(&(ms)->ms_rt_lock)
  143 #define MESH_RT_LOCK_ASSERT(ms) mtx_assert(&(ms)->ms_rt_lock, MA_OWNED)
  144 #define MESH_RT_UNLOCK(ms)      mtx_unlock(&(ms)->ms_rt_lock)
  145 
  146 MALLOC_DEFINE(M_80211_MESH_RT, "80211mesh", "802.11s routing table");
  147 
  148 /*
  149  * Helper functions to manipulate the Mesh routing table.
  150  */
  151 
  152 static struct ieee80211_mesh_route *
  153 mesh_rt_find_locked(struct ieee80211_mesh_state *ms,
  154     const uint8_t dest[IEEE80211_ADDR_LEN])
  155 {
  156         struct ieee80211_mesh_route *rt;
  157 
  158         MESH_RT_LOCK_ASSERT(ms);
  159 
  160         TAILQ_FOREACH(rt, &ms->ms_routes, rt_next) {
  161                 if (IEEE80211_ADDR_EQ(dest, rt->rt_dest))
  162                         return rt;
  163         }
  164         return NULL;
  165 }
  166 
  167 static struct ieee80211_mesh_route *
  168 mesh_rt_add_locked(struct ieee80211_mesh_state *ms,
  169     const uint8_t dest[IEEE80211_ADDR_LEN])
  170 {
  171         struct ieee80211_mesh_route *rt;
  172 
  173         KASSERT(!IEEE80211_ADDR_EQ(broadcastaddr, dest),
  174             ("%s: adding broadcast to the routing table", __func__));
  175 
  176         MESH_RT_LOCK_ASSERT(ms);
  177 
  178         rt = malloc(ALIGN(sizeof(struct ieee80211_mesh_route)) +
  179             ms->ms_ppath->mpp_privlen, M_80211_MESH_RT, M_NOWAIT | M_ZERO);
  180         if (rt != NULL) {
  181                 IEEE80211_ADDR_COPY(rt->rt_dest, dest);
  182                 rt->rt_priv = (void *)ALIGN(&rt[1]);
  183                 rt->rt_crtime = ticks;
  184                 TAILQ_INSERT_TAIL(&ms->ms_routes, rt, rt_next);
  185         }
  186         return rt;
  187 }
  188 
  189 struct ieee80211_mesh_route *
  190 ieee80211_mesh_rt_find(struct ieee80211vap *vap,
  191     const uint8_t dest[IEEE80211_ADDR_LEN])
  192 {
  193         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  194         struct ieee80211_mesh_route *rt;
  195 
  196         MESH_RT_LOCK(ms);
  197         rt = mesh_rt_find_locked(ms, dest);
  198         MESH_RT_UNLOCK(ms);
  199         return rt;
  200 }
  201 
  202 struct ieee80211_mesh_route *
  203 ieee80211_mesh_rt_add(struct ieee80211vap *vap,
  204     const uint8_t dest[IEEE80211_ADDR_LEN])
  205 {
  206         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  207         struct ieee80211_mesh_route *rt;
  208 
  209         KASSERT(ieee80211_mesh_rt_find(vap, dest) == NULL,
  210             ("%s: duplicate entry in the routing table", __func__));
  211         KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
  212             ("%s: adding self to the routing table", __func__));
  213 
  214         MESH_RT_LOCK(ms);
  215         rt = mesh_rt_add_locked(ms, dest);
  216         MESH_RT_UNLOCK(ms);
  217         return rt;
  218 }
  219 
  220 /*
  221  * Add a proxy route (as needed) for the specified destination.
  222  */
  223 void
  224 ieee80211_mesh_proxy_check(struct ieee80211vap *vap,
  225     const uint8_t dest[IEEE80211_ADDR_LEN])
  226 {
  227         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  228         struct ieee80211_mesh_route *rt;
  229 
  230         MESH_RT_LOCK(ms);
  231         rt = mesh_rt_find_locked(ms, dest);
  232         if (rt == NULL) {
  233                 rt = mesh_rt_add_locked(ms, dest);
  234                 if (rt == NULL) {
  235                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, dest,
  236                             "%s", "unable to add proxy entry");
  237                         vap->iv_stats.is_mesh_rtaddfailed++;
  238                 } else {
  239                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, dest,
  240                             "%s", "add proxy entry");
  241                         IEEE80211_ADDR_COPY(rt->rt_nexthop, vap->iv_myaddr);
  242                         rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID
  243                                      |  IEEE80211_MESHRT_FLAGS_PROXY;
  244                 }
  245         /* XXX assert PROXY? */
  246         } else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
  247                 struct ieee80211com *ic = vap->iv_ic;
  248                 /*
  249                  * Fix existing entry created by received frames from
  250                  * stations that have some memory of dest.  We also
  251                  * flush any frames held on the staging queue; delivering
  252                  * them is too much trouble right now.
  253                  */
  254                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, dest,
  255                     "%s", "fix proxy entry");
  256                 IEEE80211_ADDR_COPY(rt->rt_nexthop, vap->iv_myaddr);
  257                 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID
  258                              |  IEEE80211_MESHRT_FLAGS_PROXY;
  259                 /* XXX belongs in hwmp */
  260                 ieee80211_ageq_drain_node(&ic->ic_stageq,
  261                    (void *)(uintptr_t) ieee80211_mac_hash(ic, dest));
  262                 /* XXX stat? */
  263         }
  264         MESH_RT_UNLOCK(ms);
  265 }
  266 
  267 static __inline void
  268 mesh_rt_del(struct ieee80211_mesh_state *ms, struct ieee80211_mesh_route *rt)
  269 {
  270         TAILQ_REMOVE(&ms->ms_routes, rt, rt_next);
  271         free(rt, M_80211_MESH_RT);
  272 }
  273 
  274 void
  275 ieee80211_mesh_rt_del(struct ieee80211vap *vap,
  276     const uint8_t dest[IEEE80211_ADDR_LEN])
  277 {
  278         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  279         struct ieee80211_mesh_route *rt, *next;
  280 
  281         MESH_RT_LOCK(ms);
  282         TAILQ_FOREACH_SAFE(rt, &ms->ms_routes, rt_next, next) {
  283                 if (IEEE80211_ADDR_EQ(rt->rt_dest, dest)) {
  284                         mesh_rt_del(ms, rt);
  285                         MESH_RT_UNLOCK(ms);
  286                         return;
  287                 }
  288         }
  289         MESH_RT_UNLOCK(ms);
  290 }
  291 
  292 void
  293 ieee80211_mesh_rt_flush(struct ieee80211vap *vap)
  294 {
  295         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  296         struct ieee80211_mesh_route *rt, *next;
  297 
  298         if (ms == NULL)
  299                 return;
  300         MESH_RT_LOCK(ms);
  301         TAILQ_FOREACH_SAFE(rt, &ms->ms_routes, rt_next, next)
  302                 mesh_rt_del(ms, rt);
  303         MESH_RT_UNLOCK(ms);
  304 }
  305 
  306 void
  307 ieee80211_mesh_rt_flush_peer(struct ieee80211vap *vap,
  308     const uint8_t peer[IEEE80211_ADDR_LEN])
  309 {
  310         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  311         struct ieee80211_mesh_route *rt, *next;
  312 
  313         MESH_RT_LOCK(ms);
  314         TAILQ_FOREACH_SAFE(rt, &ms->ms_routes, rt_next, next) {
  315                 if (IEEE80211_ADDR_EQ(rt->rt_nexthop, peer))
  316                         mesh_rt_del(ms, rt);
  317         }
  318         MESH_RT_UNLOCK(ms);
  319 }
  320 
  321 /*
  322  * Flush expired routing entries, i.e. those in invalid state for
  323  * some time.
  324  */
  325 static void
  326 mesh_rt_flush_invalid(struct ieee80211vap *vap)
  327 {
  328         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  329         struct ieee80211_mesh_route *rt, *next;
  330 
  331         if (ms == NULL)
  332                 return;
  333         MESH_RT_LOCK(ms);
  334         TAILQ_FOREACH_SAFE(rt, &ms->ms_routes, rt_next, next) {
  335                 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 &&
  336                     ticks - rt->rt_crtime >= ms->ms_ppath->mpp_inact)
  337                         mesh_rt_del(ms, rt);
  338         }
  339         MESH_RT_UNLOCK(ms);
  340 }
  341 
  342 #define N(a)    (sizeof(a) / sizeof(a[0]))
  343 int
  344 ieee80211_mesh_register_proto_path(const struct ieee80211_mesh_proto_path *mpp)
  345 {
  346         int i, firstempty = -1;
  347 
  348         for (i = 0; i < N(mesh_proto_paths); i++) {
  349                 if (strncmp(mpp->mpp_descr, mesh_proto_paths[i].mpp_descr,
  350                     IEEE80211_MESH_PROTO_DSZ) == 0)
  351                         return EEXIST;
  352                 if (!mesh_proto_paths[i].mpp_active && firstempty == -1)
  353                         firstempty = i;
  354         }
  355         if (firstempty < 0)
  356                 return ENOSPC;
  357         memcpy(&mesh_proto_paths[firstempty], mpp, sizeof(*mpp));
  358         mesh_proto_paths[firstempty].mpp_active = 1;
  359         return 0;
  360 }
  361 
  362 int
  363 ieee80211_mesh_register_proto_metric(const struct
  364     ieee80211_mesh_proto_metric *mpm)
  365 {
  366         int i, firstempty = -1;
  367 
  368         for (i = 0; i < N(mesh_proto_metrics); i++) {
  369                 if (strncmp(mpm->mpm_descr, mesh_proto_metrics[i].mpm_descr,
  370                     IEEE80211_MESH_PROTO_DSZ) == 0)
  371                         return EEXIST;
  372                 if (!mesh_proto_metrics[i].mpm_active && firstempty == -1)
  373                         firstempty = i;
  374         }
  375         if (firstempty < 0)
  376                 return ENOSPC;
  377         memcpy(&mesh_proto_metrics[firstempty], mpm, sizeof(*mpm));
  378         mesh_proto_metrics[firstempty].mpm_active = 1;
  379         return 0;
  380 }
  381 
  382 static int
  383 mesh_select_proto_path(struct ieee80211vap *vap, const char *name)
  384 {
  385         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  386         int i;
  387 
  388         for (i = 0; i < N(mesh_proto_paths); i++) {
  389                 if (strcasecmp(mesh_proto_paths[i].mpp_descr, name) == 0) {
  390                         ms->ms_ppath = &mesh_proto_paths[i];
  391                         return 0;
  392                 }
  393         }
  394         return ENOENT;
  395 }
  396 
  397 static int
  398 mesh_select_proto_metric(struct ieee80211vap *vap, const char *name)
  399 {
  400         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  401         int i;
  402 
  403         for (i = 0; i < N(mesh_proto_metrics); i++) {
  404                 if (strcasecmp(mesh_proto_metrics[i].mpm_descr, name) == 0) {
  405                         ms->ms_pmetric = &mesh_proto_metrics[i];
  406                         return 0;
  407                 }
  408         }
  409         return ENOENT;
  410 }
  411 #undef  N
  412 
  413 static void
  414 ieee80211_mesh_init(void)
  415 {
  416 
  417         memset(mesh_proto_paths, 0, sizeof(mesh_proto_paths));
  418         memset(mesh_proto_metrics, 0, sizeof(mesh_proto_metrics));
  419 
  420         /*
  421          * Setup mesh parameters that depends on the clock frequency.
  422          */
  423         ieee80211_mesh_retrytimeout = msecs_to_ticks(40);
  424         ieee80211_mesh_holdingtimeout = msecs_to_ticks(40);
  425         ieee80211_mesh_confirmtimeout = msecs_to_ticks(40);
  426 
  427         /*
  428          * Register action frame handlers.
  429          */
  430         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  431             IEEE80211_ACTION_MESHPEERING_OPEN,
  432             mesh_recv_action_meshpeering_open);
  433         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  434             IEEE80211_ACTION_MESHPEERING_CONFIRM,
  435             mesh_recv_action_meshpeering_confirm);
  436         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  437             IEEE80211_ACTION_MESHPEERING_CLOSE,
  438             mesh_recv_action_meshpeering_close);
  439         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC,
  440             IEEE80211_ACTION_MESHLMETRIC_REQ, mesh_recv_action_meshlmetric_req);
  441         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC,
  442             IEEE80211_ACTION_MESHLMETRIC_REP, mesh_recv_action_meshlmetric_rep);
  443 
  444         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  445             IEEE80211_ACTION_MESHPEERING_OPEN,
  446             mesh_send_action_meshpeering_open);
  447         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  448             IEEE80211_ACTION_MESHPEERING_CONFIRM,
  449             mesh_send_action_meshpeering_confirm);
  450         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  451             IEEE80211_ACTION_MESHPEERING_CLOSE,
  452             mesh_send_action_meshpeering_close);
  453         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC, 
  454             IEEE80211_ACTION_MESHLMETRIC_REQ,
  455             mesh_send_action_meshlink_request);
  456         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC, 
  457             IEEE80211_ACTION_MESHLMETRIC_REP,
  458             mesh_send_action_meshlink_reply);
  459 
  460         /*
  461          * Register Airtime Link Metric.
  462          */
  463         ieee80211_mesh_register_proto_metric(&mesh_metric_airtime);
  464 
  465 }
  466 SYSINIT(wlan_mesh, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_mesh_init, NULL);
  467 
  468 void
  469 ieee80211_mesh_attach(struct ieee80211com *ic)
  470 {
  471         ic->ic_vattach[IEEE80211_M_MBSS] = mesh_vattach;
  472 }
  473 
  474 void
  475 ieee80211_mesh_detach(struct ieee80211com *ic)
  476 {
  477 }
  478 
  479 static void
  480 mesh_vdetach_peers(void *arg, struct ieee80211_node *ni)
  481 {
  482         struct ieee80211com *ic = ni->ni_ic;
  483         uint16_t args[3];
  484 
  485         if (ni->ni_mlstate == IEEE80211_NODE_MESH_ESTABLISHED) {
  486                 args[0] = ni->ni_mlpid;
  487                 args[1] = ni->ni_mllid;
  488                 args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
  489                 ieee80211_send_action(ni,
  490                     IEEE80211_ACTION_CAT_MESHPEERING,
  491                     IEEE80211_ACTION_MESHPEERING_CLOSE,
  492                     args);
  493         }
  494         callout_drain(&ni->ni_mltimer);
  495         /* XXX belongs in hwmp */
  496         ieee80211_ageq_drain_node(&ic->ic_stageq,
  497            (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
  498 }
  499 
  500 static void
  501 mesh_vdetach(struct ieee80211vap *vap)
  502 {
  503         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  504 
  505         callout_drain(&ms->ms_cleantimer);
  506         ieee80211_iterate_nodes(&vap->iv_ic->ic_sta, mesh_vdetach_peers,
  507             NULL);
  508         ieee80211_mesh_rt_flush(vap);
  509         mtx_destroy(&ms->ms_rt_lock);
  510         ms->ms_ppath->mpp_vdetach(vap);
  511         free(vap->iv_mesh, M_80211_VAP);
  512         vap->iv_mesh = NULL;
  513 }
  514 
  515 static void
  516 mesh_vattach(struct ieee80211vap *vap)
  517 {
  518         struct ieee80211_mesh_state *ms;
  519         vap->iv_newstate = mesh_newstate;
  520         vap->iv_input = mesh_input;
  521         vap->iv_opdetach = mesh_vdetach;
  522         vap->iv_recv_mgmt = mesh_recv_mgmt;
  523         ms = malloc(sizeof(struct ieee80211_mesh_state), M_80211_VAP,
  524             M_NOWAIT | M_ZERO);
  525         if (ms == NULL) {
  526                 printf("%s: couldn't alloc MBSS state\n", __func__);
  527                 return;
  528         }
  529         vap->iv_mesh = ms;
  530         ms->ms_seq = 0;
  531         ms->ms_flags = (IEEE80211_MESHFLAGS_AP | IEEE80211_MESHFLAGS_FWD);
  532         ms->ms_ttl = IEEE80211_MESH_DEFAULT_TTL;
  533         TAILQ_INIT(&ms->ms_routes);
  534         mtx_init(&ms->ms_rt_lock, "MBSS", "802.11s routing table", MTX_DEF);
  535         callout_init(&ms->ms_cleantimer, CALLOUT_MPSAFE);
  536         mesh_select_proto_metric(vap, "AIRTIME");
  537         KASSERT(ms->ms_pmetric, ("ms_pmetric == NULL"));
  538         mesh_select_proto_path(vap, "HWMP");
  539         KASSERT(ms->ms_ppath, ("ms_ppath == NULL"));
  540         ms->ms_ppath->mpp_vattach(vap);
  541 }
  542 
  543 /*
  544  * IEEE80211_M_MBSS vap state machine handler.
  545  */
  546 static int
  547 mesh_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  548 {
  549         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  550         struct ieee80211com *ic = vap->iv_ic;
  551         struct ieee80211_node *ni;
  552         enum ieee80211_state ostate;
  553 
  554         IEEE80211_LOCK_ASSERT(ic);
  555 
  556         ostate = vap->iv_state;
  557         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  558             __func__, ieee80211_state_name[ostate],
  559             ieee80211_state_name[nstate], arg);
  560         vap->iv_state = nstate;         /* state transition */
  561         if (ostate != IEEE80211_S_SCAN)
  562                 ieee80211_cancel_scan(vap);     /* background scan */
  563         ni = vap->iv_bss;                       /* NB: no reference held */
  564         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
  565                 callout_drain(&ms->ms_cleantimer);
  566         switch (nstate) {
  567         case IEEE80211_S_INIT:
  568                 switch (ostate) {
  569                 case IEEE80211_S_SCAN:
  570                         ieee80211_cancel_scan(vap);
  571                         break;
  572                 case IEEE80211_S_CAC:
  573                         ieee80211_dfs_cac_stop(vap);
  574                         break;
  575                 case IEEE80211_S_RUN:
  576                         ieee80211_iterate_nodes(&ic->ic_sta,
  577                             mesh_vdetach_peers, NULL);
  578                         break;
  579                 default:
  580                         break;
  581                 }
  582                 if (ostate != IEEE80211_S_INIT) {
  583                         /* NB: optimize INIT -> INIT case */
  584                         ieee80211_reset_bss(vap);
  585                         ieee80211_mesh_rt_flush(vap);
  586                 }
  587                 break;
  588         case IEEE80211_S_SCAN:
  589                 switch (ostate) {
  590                 case IEEE80211_S_INIT:
  591                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
  592                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan) &&
  593                             ms->ms_idlen != 0) {
  594                                 /*
  595                                  * Already have a channel and a mesh ID; bypass
  596                                  * the scan and startup immediately.
  597                                  */
  598                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
  599                                 break;
  600                         }
  601                         /*
  602                          * Initiate a scan.  We can come here as a result
  603                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  604                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  605                          * and the scan request parameters will be present
  606                          * in iv_scanreq.  Otherwise we do the default.
  607                         */
  608                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  609                                 ieee80211_check_scan(vap,
  610                                     vap->iv_scanreq_flags,
  611                                     vap->iv_scanreq_duration,
  612                                     vap->iv_scanreq_mindwell,
  613                                     vap->iv_scanreq_maxdwell,
  614                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  615                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  616                         } else
  617                                 ieee80211_check_scan_current(vap);
  618                         break;
  619                 default:
  620                         break;
  621                 }
  622                 break;
  623         case IEEE80211_S_CAC:
  624                 /*
  625                  * Start CAC on a DFS channel.  We come here when starting
  626                  * a bss on a DFS channel (see ieee80211_create_ibss).
  627                  */
  628                 ieee80211_dfs_cac_start(vap);
  629                 break;
  630         case IEEE80211_S_RUN:
  631                 switch (ostate) {
  632                 case IEEE80211_S_INIT:
  633                         /*
  634                          * Already have a channel; bypass the
  635                          * scan and startup immediately.
  636                          * Note that ieee80211_create_ibss will call
  637                          * back to do a RUN->RUN state change.
  638                          */
  639                         ieee80211_create_ibss(vap,
  640                             ieee80211_ht_adjust_channel(ic,
  641                                 ic->ic_curchan, vap->iv_flags_ht));
  642                         /* NB: iv_bss is changed on return */
  643                         break;
  644                 case IEEE80211_S_CAC:
  645                         /*
  646                          * NB: This is the normal state change when CAC
  647                          * expires and no radar was detected; no need to
  648                          * clear the CAC timer as it's already expired.
  649                          */
  650                         /* fall thru... */
  651                 case IEEE80211_S_CSA:
  652 #if 0
  653                         /*
  654                          * Shorten inactivity timer of associated stations
  655                          * to weed out sta's that don't follow a CSA.
  656                          */
  657                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
  658 #endif
  659                         /*
  660                          * Update bss node channel to reflect where
  661                          * we landed after CSA.
  662                          */
  663                         ieee80211_node_set_chan(vap->iv_bss,
  664                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
  665                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
  666                         /* XXX bypass debug msgs */
  667                         break;
  668                 case IEEE80211_S_SCAN:
  669                 case IEEE80211_S_RUN:
  670 #ifdef IEEE80211_DEBUG
  671                         if (ieee80211_msg_debug(vap)) {
  672                                 struct ieee80211_node *ni = vap->iv_bss;
  673                                 ieee80211_note(vap,
  674                                     "synchronized with %s meshid ",
  675                                     ether_sprintf(ni->ni_meshid));
  676                                 ieee80211_print_essid(ni->ni_meshid,
  677                                     ni->ni_meshidlen);
  678                                 /* XXX MCS/HT */
  679                                 printf(" channel %d\n",
  680                                     ieee80211_chan2ieee(ic, ic->ic_curchan));
  681                         }
  682 #endif
  683                         break;
  684                 default:
  685                         break;
  686                 }
  687                 ieee80211_node_authorize(vap->iv_bss);
  688                 callout_reset(&ms->ms_cleantimer, ms->ms_ppath->mpp_inact,
  689                     mesh_rt_cleanup_cb, vap);
  690                 break;
  691         default:
  692                 break;
  693         }
  694         /* NB: ostate not nstate */
  695         ms->ms_ppath->mpp_newstate(vap, ostate, arg);
  696         return 0;
  697 }
  698 
  699 static void
  700 mesh_rt_cleanup_cb(void *arg)
  701 {
  702         struct ieee80211vap *vap = arg;
  703         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  704 
  705         mesh_rt_flush_invalid(vap);
  706         callout_reset(&ms->ms_cleantimer, ms->ms_ppath->mpp_inact,
  707             mesh_rt_cleanup_cb, vap);
  708 }
  709 
  710 
  711 /*
  712  * Helper function to note the Mesh Peer Link FSM change.
  713  */
  714 static void
  715 mesh_linkchange(struct ieee80211_node *ni, enum ieee80211_mesh_mlstate state)
  716 {
  717         struct ieee80211vap *vap = ni->ni_vap;
  718         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  719 #ifdef IEEE80211_DEBUG
  720         static const char *meshlinkstates[] = {
  721                 [IEEE80211_NODE_MESH_IDLE]              = "IDLE",
  722                 [IEEE80211_NODE_MESH_OPENSNT]           = "OPEN SENT",
  723                 [IEEE80211_NODE_MESH_OPENRCV]           = "OPEN RECEIVED",
  724                 [IEEE80211_NODE_MESH_CONFIRMRCV]        = "CONFIRM RECEIVED",
  725                 [IEEE80211_NODE_MESH_ESTABLISHED]       = "ESTABLISHED",
  726                 [IEEE80211_NODE_MESH_HOLDING]           = "HOLDING"
  727         };
  728 #endif
  729         IEEE80211_NOTE(vap, IEEE80211_MSG_MESH,
  730             ni, "peer link: %s -> %s",
  731             meshlinkstates[ni->ni_mlstate], meshlinkstates[state]);
  732 
  733         /* track neighbor count */
  734         if (state == IEEE80211_NODE_MESH_ESTABLISHED &&
  735             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) {
  736                 KASSERT(ms->ms_neighbors < 65535, ("neighbor count overflow"));
  737                 ms->ms_neighbors++;
  738                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_MESHCONF);
  739         } else if (ni->ni_mlstate == IEEE80211_NODE_MESH_ESTABLISHED &&
  740             state != IEEE80211_NODE_MESH_ESTABLISHED) {
  741                 KASSERT(ms->ms_neighbors > 0, ("neighbor count 0"));
  742                 ms->ms_neighbors--;
  743                 ieee80211_beacon_notify(vap, IEEE80211_BEACON_MESHCONF);
  744         }
  745         ni->ni_mlstate = state;
  746         switch (state) {
  747         case IEEE80211_NODE_MESH_HOLDING:
  748                 ms->ms_ppath->mpp_peerdown(ni);
  749                 break;
  750         case IEEE80211_NODE_MESH_ESTABLISHED:
  751                 ieee80211_mesh_discover(vap, ni->ni_macaddr, NULL);
  752                 break;
  753         default:
  754                 break;
  755         }
  756 }
  757 
  758 /*
  759  * Helper function to generate a unique local ID required for mesh
  760  * peer establishment.
  761  */
  762 static void
  763 mesh_checkid(void *arg, struct ieee80211_node *ni)
  764 {
  765         uint16_t *r = arg;
  766         
  767         if (*r == ni->ni_mllid)
  768                 *(uint16_t *)arg = 0;
  769 }
  770 
  771 static uint32_t
  772 mesh_generateid(struct ieee80211vap *vap)
  773 {
  774         int maxiter = 4;
  775         uint16_t r;
  776 
  777         do {
  778                 get_random_bytes(&r, 2);
  779                 ieee80211_iterate_nodes(&vap->iv_ic->ic_sta, mesh_checkid, &r);
  780                 maxiter--;
  781         } while (r == 0 && maxiter > 0);
  782         return r;
  783 }
  784 
  785 /*
  786  * Verifies if we already received this packet by checking its
  787  * sequence number.
  788  * Returns 0 if the frame is to be accepted, 1 otherwise.
  789  */
  790 static int
  791 mesh_checkpseq(struct ieee80211vap *vap,
  792     const uint8_t source[IEEE80211_ADDR_LEN], uint32_t seq)
  793 {
  794         struct ieee80211_mesh_route *rt;
  795 
  796         rt = ieee80211_mesh_rt_find(vap, source);
  797         if (rt == NULL) {
  798                 rt = ieee80211_mesh_rt_add(vap, source);
  799                 if (rt == NULL) {
  800                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, source,
  801                             "%s", "add mcast route failed");
  802                         vap->iv_stats.is_mesh_rtaddfailed++;
  803                         return 1;
  804                 }
  805                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, source,
  806                     "add mcast route, mesh seqno %d", seq);
  807                 rt->rt_lastmseq = seq;
  808                 return 0;
  809         }
  810         if (IEEE80211_MESH_SEQ_GEQ(rt->rt_lastmseq, seq)) {
  811                 return 1;
  812         } else {
  813                 rt->rt_lastmseq = seq;
  814                 return 0;
  815         }
  816 }
  817 
  818 /*
  819  * Iterate the routing table and locate the next hop.
  820  */
  821 static struct ieee80211_node *
  822 mesh_find_txnode(struct ieee80211vap *vap,
  823     const uint8_t dest[IEEE80211_ADDR_LEN])
  824 {
  825         struct ieee80211_mesh_route *rt;
  826 
  827         rt = ieee80211_mesh_rt_find(vap, dest);
  828         if (rt == NULL)
  829                 return NULL;
  830         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
  831             (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
  832                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, dest,
  833                     "%s: !valid or proxy, flags 0x%x", __func__, rt->rt_flags);
  834                 /* XXX stat */
  835                 return NULL;
  836         }
  837         return ieee80211_find_txnode(vap, rt->rt_nexthop);
  838 }
  839 
  840 /*
  841  * Forward the specified frame.
  842  * Decrement the TTL and set TA to our MAC address.
  843  */
  844 static void
  845 mesh_forward(struct ieee80211vap *vap, struct mbuf *m,
  846     const struct ieee80211_meshcntl *mc)
  847 {
  848         struct ieee80211com *ic = vap->iv_ic;
  849         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  850         struct ifnet *ifp = vap->iv_ifp;
  851         struct ifnet *parent = ic->ic_ifp;
  852         const struct ieee80211_frame *wh =
  853             mtod(m, const struct ieee80211_frame *);
  854         struct mbuf *mcopy;
  855         struct ieee80211_meshcntl *mccopy;
  856         struct ieee80211_frame *whcopy;
  857         struct ieee80211_node *ni;
  858         int err;
  859 
  860         if (mc->mc_ttl == 0) {
  861                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  862                     "%s", "frame not fwd'd, ttl 0");
  863                 vap->iv_stats.is_mesh_fwd_ttl++;
  864                 return;
  865         }
  866         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
  867                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  868                     "%s", "frame not fwd'd, fwding disabled");
  869                 vap->iv_stats.is_mesh_fwd_disabled++;
  870                 return;
  871         }
  872         mcopy = m_dup(m, M_DONTWAIT);
  873         if (mcopy == NULL) {
  874                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  875                     "%s", "frame not fwd'd, cannot dup");
  876                 vap->iv_stats.is_mesh_fwd_nobuf++;
  877                 ifp->if_oerrors++;
  878                 return;
  879         }
  880         mcopy = m_pullup(mcopy, ieee80211_hdrspace(ic, wh) +
  881             sizeof(struct ieee80211_meshcntl));
  882         if (mcopy == NULL) {
  883                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  884                     "%s", "frame not fwd'd, too short");
  885                 vap->iv_stats.is_mesh_fwd_tooshort++;
  886                 ifp->if_oerrors++;
  887                 m_freem(mcopy);
  888                 return;
  889         }
  890         whcopy = mtod(mcopy, struct ieee80211_frame *);
  891         mccopy = (struct ieee80211_meshcntl *)
  892             (mtod(mcopy, uint8_t *) + ieee80211_hdrspace(ic, wh));
  893         /* XXX clear other bits? */
  894         whcopy->i_fc[1] &= ~IEEE80211_FC1_RETRY;
  895         IEEE80211_ADDR_COPY(whcopy->i_addr2, vap->iv_myaddr);
  896         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  897                 ni = ieee80211_ref_node(vap->iv_bss);
  898                 mcopy->m_flags |= M_MCAST;
  899         } else {
  900                 ni = mesh_find_txnode(vap, whcopy->i_addr3);
  901                 if (ni == NULL) {
  902                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  903                             "%s", "frame not fwd'd, no path");
  904                         vap->iv_stats.is_mesh_fwd_nopath++;
  905                         m_freem(mcopy);
  906                         return;
  907                 }
  908                 IEEE80211_ADDR_COPY(whcopy->i_addr1, ni->ni_macaddr);
  909         }
  910         KASSERT(mccopy->mc_ttl > 0, ("%s called with wrong ttl", __func__));
  911         mccopy->mc_ttl--;
  912 
  913         /* XXX calculate priority so drivers can find the tx queue */
  914         M_WME_SETAC(mcopy, WME_AC_BE);
  915 
  916         /* XXX do we know m_nextpkt is NULL? */
  917         mcopy->m_pkthdr.rcvif = (void *) ni;
  918         err = parent->if_transmit(parent, mcopy);
  919         if (err != 0) {
  920                 /* NB: IFQ_HANDOFF reclaims mbuf */
  921                 ieee80211_free_node(ni);
  922         } else {
  923                 ifp->if_opackets++;
  924         }
  925 }
  926 
  927 static struct mbuf *
  928 mesh_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, int meshdrlen)
  929 {
  930 #define WHDIR(wh) ((wh)->i_fc[1] & IEEE80211_FC1_DIR_MASK)
  931         uint8_t b[sizeof(struct ieee80211_qosframe_addr4) +
  932                   sizeof(struct ieee80211_meshcntl_ae11)];
  933         const struct ieee80211_qosframe_addr4 *wh;
  934         const struct ieee80211_meshcntl_ae10 *mc;
  935         struct ether_header *eh;
  936         struct llc *llc;
  937         int ae;
  938 
  939         if (m->m_len < hdrlen + sizeof(*llc) &&
  940             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
  941                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
  942                     "discard data frame: %s", "m_pullup failed");
  943                 vap->iv_stats.is_rx_tooshort++;
  944                 return NULL;
  945         }
  946         memcpy(b, mtod(m, caddr_t), hdrlen);
  947         wh = (const struct ieee80211_qosframe_addr4 *)&b[0];
  948         mc = (const struct ieee80211_meshcntl_ae10 *)&b[hdrlen - meshdrlen];
  949         KASSERT(WHDIR(wh) == IEEE80211_FC1_DIR_FROMDS ||
  950                 WHDIR(wh) == IEEE80211_FC1_DIR_DSTODS,
  951             ("bogus dir, fc 0x%x:0x%x", wh->i_fc[0], wh->i_fc[1]));
  952 
  953         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
  954         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
  955             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
  956             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
  957             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
  958             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
  959               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
  960                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
  961                 llc = NULL;
  962         } else {
  963                 m_adj(m, hdrlen - sizeof(*eh));
  964         }
  965         eh = mtod(m, struct ether_header *);
  966         ae = mc->mc_flags & 3;
  967         if (WHDIR(wh) == IEEE80211_FC1_DIR_FROMDS) {
  968                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh->i_addr1);
  969                 if (ae == 0) {
  970                         IEEE80211_ADDR_COPY(eh->ether_shost, wh->i_addr3);
  971                 } else if (ae == 1) {
  972                         IEEE80211_ADDR_COPY(eh->ether_shost, mc->mc_addr4);
  973                 } else {
  974                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  975                             (const struct ieee80211_frame *)wh, NULL,
  976                             "bad AE %d", ae);
  977                         vap->iv_stats.is_mesh_badae++;
  978                         m_freem(m);
  979                         return NULL;
  980                 }
  981         } else {
  982                 if (ae == 0) {
  983                         IEEE80211_ADDR_COPY(eh->ether_dhost, wh->i_addr3);
  984                         IEEE80211_ADDR_COPY(eh->ether_shost, wh->i_addr4);
  985                 } else if (ae == 2) {
  986                         IEEE80211_ADDR_COPY(eh->ether_dhost, mc->mc_addr4);
  987                         IEEE80211_ADDR_COPY(eh->ether_shost, mc->mc_addr5);
  988                 } else {
  989                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  990                             (const struct ieee80211_frame *)wh, NULL,
  991                             "bad AE %d", ae);
  992                         vap->iv_stats.is_mesh_badae++;
  993                         m_freem(m);
  994                         return NULL;
  995                 }
  996         }
  997 #ifdef ALIGNED_POINTER
  998         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
  999                 m = ieee80211_realign(vap, m, sizeof(*eh));
 1000                 if (m == NULL)
 1001                         return NULL;
 1002         }
 1003 #endif /* ALIGNED_POINTER */
 1004         if (llc != NULL) {
 1005                 eh = mtod(m, struct ether_header *);
 1006                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
 1007         }
 1008         return m;
 1009 #undef WDIR
 1010 }
 1011 
 1012 /*
 1013  * Return non-zero if the unicast mesh data frame should be processed
 1014  * locally.  Frames that are not proxy'd have our address, otherwise
 1015  * we need to consult the routing table to look for a proxy entry.
 1016  */
 1017 static __inline int
 1018 mesh_isucastforme(struct ieee80211vap *vap, const struct ieee80211_frame *wh,
 1019     const struct ieee80211_meshcntl *mc)
 1020 {
 1021         int ae = mc->mc_flags & 3;
 1022 
 1023         KASSERT((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS,
 1024             ("bad dir 0x%x:0x%x", wh->i_fc[0], wh->i_fc[1]));
 1025         KASSERT(ae == 0 || ae == 2, ("bad AE %d", ae));
 1026         if (ae == 2) {                          /* ucast w/ proxy */
 1027                 const struct ieee80211_meshcntl_ae10 *mc10 =
 1028                     (const struct ieee80211_meshcntl_ae10 *) mc;
 1029                 struct ieee80211_mesh_route *rt =
 1030                     ieee80211_mesh_rt_find(vap, mc10->mc_addr4);
 1031                 /* check for proxy route to ourself */
 1032                 return (rt != NULL &&
 1033                     (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY));
 1034         } else                                  /* ucast w/o proxy */
 1035                 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 1036 }
 1037 
 1038 static int
 1039 mesh_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 1040 {
 1041 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 1042 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 1043         struct ieee80211vap *vap = ni->ni_vap;
 1044         struct ieee80211com *ic = ni->ni_ic;
 1045         struct ifnet *ifp = vap->iv_ifp;
 1046         struct ieee80211_frame *wh;
 1047         const struct ieee80211_meshcntl *mc;
 1048         int hdrspace, meshdrlen, need_tap;
 1049         uint8_t dir, type, subtype, qos;
 1050         uint32_t seq;
 1051         uint8_t *addr;
 1052         ieee80211_seq rxseq;
 1053 
 1054         KASSERT(ni != NULL, ("null node"));
 1055         ni->ni_inact = ni->ni_inact_reload;
 1056 
 1057         need_tap = 1;                   /* mbuf need to be tapped. */
 1058         type = -1;                      /* undefined */
 1059 
 1060         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 1061                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1062                     ni->ni_macaddr, NULL,
 1063                     "too short (1): len %u", m->m_pkthdr.len);
 1064                 vap->iv_stats.is_rx_tooshort++;
 1065                 goto out;
 1066         }
 1067         /*
 1068          * Bit of a cheat here, we use a pointer for a 3-address
 1069          * frame format but don't reference fields past outside
 1070          * ieee80211_frame_min w/o first validating the data is
 1071          * present.
 1072         */
 1073         wh = mtod(m, struct ieee80211_frame *);
 1074 
 1075         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 1076             IEEE80211_FC0_VERSION_0) {
 1077                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1078                     ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
 1079                 vap->iv_stats.is_rx_badversion++;
 1080                 goto err;
 1081         }
 1082         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 1083         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 1084         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 1085         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 1086                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 1087                 ni->ni_noise = nf;
 1088                 if (HAS_SEQ(type)) {
 1089                         uint8_t tid = ieee80211_gettid(wh);
 1090 
 1091                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 1092                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 1093                                 ic->ic_wme.wme_hipri_traffic++;
 1094                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 1095                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 1096                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 1097                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 1098                                 /* duplicate, discard */
 1099                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1100                                     wh->i_addr1, "duplicate",
 1101                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 1102                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 1103                                     ni->ni_rxseqs[tid] >>
 1104                                     IEEE80211_SEQ_SEQ_SHIFT,
 1105                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 1106                                     ni->ni_rxseqs[tid] &
 1107                                     IEEE80211_SEQ_FRAG_MASK,
 1108                                     tid);
 1109                                 vap->iv_stats.is_rx_dup++;
 1110                                 IEEE80211_NODE_STAT(ni, rx_dup);
 1111                                 goto out;
 1112                         }
 1113                         ni->ni_rxseqs[tid] = rxseq;
 1114                 }
 1115         }
 1116 #ifdef IEEE80211_DEBUG
 1117         /*
 1118          * It's easier, but too expensive, to simulate different mesh
 1119          * topologies by consulting the ACL policy very early, so do this
 1120          * only under DEBUG.
 1121          *
 1122          * NB: this check is also done upon peering link initiation.
 1123          */
 1124         if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
 1125                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
 1126                     wh, NULL, "%s", "disallowed by ACL");
 1127                 vap->iv_stats.is_rx_acl++;
 1128                 goto out;
 1129         }
 1130 #endif
 1131         switch (type) {
 1132         case IEEE80211_FC0_TYPE_DATA:
 1133                 if (ni == vap->iv_bss)
 1134                         goto out;
 1135                 if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) {
 1136                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_MESH,
 1137                             ni->ni_macaddr, NULL,
 1138                             "peer link not yet established (%d)",
 1139                             ni->ni_mlstate);
 1140                         vap->iv_stats.is_mesh_nolink++;
 1141                         goto out;
 1142                 }       
 1143                 if (dir != IEEE80211_FC1_DIR_FROMDS &&
 1144                     dir != IEEE80211_FC1_DIR_DSTODS) {
 1145                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1146                             wh, "data", "incorrect dir 0x%x", dir);
 1147                         vap->iv_stats.is_rx_wrongdir++;
 1148                         goto err;
 1149                 }
 1150                 /* pull up enough to get to the mesh control */
 1151                 hdrspace = ieee80211_hdrspace(ic, wh);
 1152                 if (m->m_len < hdrspace + sizeof(struct ieee80211_meshcntl) &&
 1153                     (m = m_pullup(m, hdrspace +
 1154                         sizeof(struct ieee80211_meshcntl))) == NULL) {
 1155                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1156                             ni->ni_macaddr, NULL,
 1157                             "data too short: expecting %u", hdrspace);
 1158                         vap->iv_stats.is_rx_tooshort++;
 1159                         goto out;               /* XXX */
 1160                 }
 1161                 /*
 1162                  * Now calculate the full extent of the headers. Note
 1163                  * mesh_decap will pull up anything we didn't get
 1164                  * above when it strips the 802.11 headers.
 1165                  */
 1166                 mc = (const struct ieee80211_meshcntl *)
 1167                     (mtod(m, const uint8_t *) + hdrspace);
 1168                 meshdrlen = sizeof(struct ieee80211_meshcntl) +
 1169                     (mc->mc_flags & 3) * IEEE80211_ADDR_LEN;
 1170                 hdrspace += meshdrlen;
 1171                 seq = LE_READ_4(mc->mc_seq);
 1172                 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
 1173                         addr = wh->i_addr3;
 1174                 else
 1175                         addr = ((struct ieee80211_qosframe_addr4 *)wh)->i_addr4;
 1176                 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, addr)) {
 1177                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1178                             addr, "data", "%s", "not to me");
 1179                         vap->iv_stats.is_rx_wrongbss++; /* XXX kinda */
 1180                         goto out;
 1181                 }
 1182                 if (mesh_checkpseq(vap, addr, seq) != 0) {
 1183                         vap->iv_stats.is_rx_dup++;
 1184                         goto out;
 1185                 }
 1186 
 1187                 /*
 1188                  * Potentially forward packet.  See table s36 (p140)
 1189                  * for the rules.  XXX tap fwd'd packets not for us?
 1190                  */
 1191                 if (dir == IEEE80211_FC1_DIR_FROMDS ||
 1192                     !mesh_isucastforme(vap, wh, mc)) {
 1193                         mesh_forward(vap, m, mc);
 1194                         if (dir == IEEE80211_FC1_DIR_DSTODS)
 1195                                 goto out;
 1196                         /* NB: fall thru to deliver mcast frames locally */
 1197                 }
 1198 
 1199                 /*
 1200                  * Save QoS bits for use below--before we strip the header.
 1201                  */
 1202                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 1203                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 1204                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 1205                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 1206                 } else
 1207                         qos = 0;
 1208                 /*
 1209                  * Next up, any fragmentation.
 1210                  */
 1211                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1212                         m = ieee80211_defrag(ni, m, hdrspace);
 1213                         if (m == NULL) {
 1214                                 /* Fragment dropped or frame not complete yet */
 1215                                 goto out;
 1216                         }
 1217                 }
 1218                 wh = NULL;              /* no longer valid, catch any uses */
 1219 
 1220                 if (ieee80211_radiotap_active_vap(vap))
 1221                         ieee80211_radiotap_rx(vap, m);
 1222                 need_tap = 0;
 1223 
 1224                 /*
 1225                  * Finally, strip the 802.11 header.
 1226                  */
 1227                 m = mesh_decap(vap, m, hdrspace, meshdrlen);
 1228                 if (m == NULL) {
 1229                         /* XXX mask bit to check for both */
 1230                         /* don't count Null data frames as errors */
 1231                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 1232                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 1233                                 goto out;
 1234                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1235                             ni->ni_macaddr, "data", "%s", "decap error");
 1236                         vap->iv_stats.is_rx_decap++;
 1237                         IEEE80211_NODE_STAT(ni, rx_decap);
 1238                         goto err;
 1239                 }
 1240                 if (qos & IEEE80211_QOS_AMSDU) {
 1241                         m = ieee80211_decap_amsdu(ni, m);
 1242                         if (m == NULL)
 1243                                 return IEEE80211_FC0_TYPE_DATA;
 1244                 }
 1245                 ieee80211_deliver_data(vap, ni, m);
 1246                 return type;
 1247         case IEEE80211_FC0_TYPE_MGT:
 1248                 vap->iv_stats.is_rx_mgmt++;
 1249                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 1250                 if (dir != IEEE80211_FC1_DIR_NODS) {
 1251                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1252                             wh, "mgt", "incorrect dir 0x%x", dir);
 1253                         vap->iv_stats.is_rx_wrongdir++;
 1254                         goto err;
 1255                 }
 1256                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 1257                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1258                             ni->ni_macaddr, "mgt", "too short: len %u",
 1259                             m->m_pkthdr.len);
 1260                         vap->iv_stats.is_rx_tooshort++;
 1261                         goto out;
 1262                 }
 1263 #ifdef IEEE80211_DEBUG
 1264                 if ((ieee80211_msg_debug(vap) && 
 1265                     (vap->iv_ic->ic_flags & IEEE80211_F_SCAN)) ||
 1266                     ieee80211_msg_dumppkts(vap)) {
 1267                         if_printf(ifp, "received %s from %s rssi %d\n",
 1268                             ieee80211_mgt_subtype_name[subtype >>
 1269                             IEEE80211_FC0_SUBTYPE_SHIFT],
 1270                             ether_sprintf(wh->i_addr2), rssi);
 1271                 }
 1272 #endif
 1273                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 1274                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1275                             wh, NULL, "%s", "WEP set but not permitted");
 1276                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 1277                         goto out;
 1278                 }
 1279                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 1280                 goto out;
 1281         case IEEE80211_FC0_TYPE_CTL:
 1282                 vap->iv_stats.is_rx_ctl++;
 1283                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 1284                 goto out;
 1285         default:
 1286                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1287                     wh, "bad", "frame type 0x%x", type);
 1288                 /* should not come here */
 1289                 break;
 1290         }
 1291 err:
 1292         ifp->if_ierrors++;
 1293 out:
 1294         if (m != NULL) {
 1295                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 1296                         ieee80211_radiotap_rx(vap, m);
 1297                 m_freem(m);
 1298         }
 1299         return type;
 1300 }
 1301 
 1302 static void
 1303 mesh_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
 1304     int rssi, int nf)
 1305 {
 1306         struct ieee80211vap *vap = ni->ni_vap;
 1307         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1308         struct ieee80211com *ic = ni->ni_ic;
 1309         struct ieee80211_frame *wh;
 1310         uint8_t *frm, *efrm;
 1311 
 1312         wh = mtod(m0, struct ieee80211_frame *);
 1313         frm = (uint8_t *)&wh[1];
 1314         efrm = mtod(m0, uint8_t *) + m0->m_len;
 1315         switch (subtype) {
 1316         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 1317         case IEEE80211_FC0_SUBTYPE_BEACON:
 1318         {
 1319                 struct ieee80211_scanparams scan;
 1320                 /*
 1321                  * We process beacon/probe response
 1322                  * frames to discover neighbors.
 1323                  */
 1324                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 1325                         return;
 1326                 /*
 1327                  * Count frame now that we know it's to be processed.
 1328                  */
 1329                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 1330                         vap->iv_stats.is_rx_beacon++;   /* XXX remove */
 1331                         IEEE80211_NODE_STAT(ni, rx_beacons);
 1332                 } else
 1333                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 1334                 /*
 1335                  * If scanning, just pass information to the scan module.
 1336                  */
 1337                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 1338                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 1339                                 /*
 1340                                  * Actively scanning a channel marked passive;
 1341                                  * send a probe request now that we know there
 1342                                  * is 802.11 traffic present.
 1343                                  *
 1344                                  * XXX check if the beacon we recv'd gives
 1345                                  * us what we need and suppress the probe req
 1346                                  */
 1347                                 ieee80211_probe_curchan(vap, 1);
 1348                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 1349                         }
 1350                         ieee80211_add_scan(vap, &scan, wh,
 1351                             subtype, rssi, nf);
 1352                         return;
 1353                 }
 1354 
 1355                 /* The rest of this code assumes we are running */
 1356                 if (vap->iv_state != IEEE80211_S_RUN)
 1357                         return;
 1358                 /*
 1359                  * Ignore non-mesh STAs.
 1360                  */
 1361                 if ((scan.capinfo &
 1362                      (IEEE80211_CAPINFO_ESS|IEEE80211_CAPINFO_IBSS)) ||
 1363                     scan.meshid == NULL || scan.meshconf == NULL) {
 1364                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1365                             wh, "beacon", "%s", "not a mesh sta");
 1366                         vap->iv_stats.is_mesh_wrongmesh++;
 1367                         return;
 1368                 }
 1369                 /*
 1370                  * Ignore STAs for other mesh networks.
 1371                  */
 1372                 if (memcmp(scan.meshid+2, ms->ms_id, ms->ms_idlen) != 0 ||
 1373                     mesh_verify_meshconf(vap, scan.meshconf)) {
 1374                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1375                             wh, "beacon", "%s", "not for our mesh");
 1376                         vap->iv_stats.is_mesh_wrongmesh++;
 1377                         return;
 1378                 }
 1379                 /*
 1380                  * Peer only based on the current ACL policy.
 1381                  */
 1382                 if (vap->iv_acl != NULL &&
 1383                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
 1384                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
 1385                             wh, NULL, "%s", "disallowed by ACL");
 1386                         vap->iv_stats.is_rx_acl++;
 1387                         return;
 1388                 }
 1389                 /*
 1390                  * Do neighbor discovery.
 1391                  */
 1392                 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 1393                         /*
 1394                          * Create a new entry in the neighbor table.
 1395                          */
 1396                         ni = ieee80211_add_neighbor(vap, wh, &scan);
 1397                 }
 1398                 /*
 1399                  * Automatically peer with discovered nodes if possible.
 1400                  * XXX backoff on repeated failure
 1401                  */
 1402                 if (ni != vap->iv_bss &&
 1403                     (ms->ms_flags & IEEE80211_MESHFLAGS_AP) &&
 1404                     ni->ni_mlstate == IEEE80211_NODE_MESH_IDLE) {
 1405                         uint16_t args[1];
 1406 
 1407                         ni->ni_mlpid = mesh_generateid(vap);
 1408                         if (ni->ni_mlpid == 0)
 1409                                 return;
 1410                         mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENSNT);
 1411                         args[0] = ni->ni_mlpid;
 1412                         ieee80211_send_action(ni,
 1413                             IEEE80211_ACTION_CAT_MESHPEERING,
 1414                             IEEE80211_ACTION_MESHPEERING_OPEN, args);
 1415                         ni->ni_mlrcnt = 0;
 1416                         mesh_peer_timeout_setup(ni);
 1417                 }
 1418                 break;
 1419         }
 1420         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 1421         {
 1422                 uint8_t *ssid, *meshid, *rates, *xrates;
 1423                 uint8_t *sfrm;
 1424 
 1425                 if (vap->iv_state != IEEE80211_S_RUN) {
 1426                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1427                             wh, NULL, "wrong state %s",
 1428                             ieee80211_state_name[vap->iv_state]);
 1429                         vap->iv_stats.is_rx_mgtdiscard++;
 1430                         return;
 1431                 }
 1432                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 1433                         /* frame must be directed */
 1434                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1435                             wh, NULL, "%s", "not unicast");
 1436                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 1437                         return;
 1438                 }
 1439                 /*
 1440                  * prreq frame format
 1441                  *      [tlv] ssid
 1442                  *      [tlv] supported rates
 1443                  *      [tlv] extended supported rates
 1444                  *      [tlv] mesh id
 1445                  */
 1446                 ssid = meshid = rates = xrates = NULL;
 1447                 sfrm = frm;
 1448                 while (efrm - frm > 1) {
 1449                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1450                         switch (*frm) {
 1451                         case IEEE80211_ELEMID_SSID:
 1452                                 ssid = frm;
 1453                                 break;
 1454                         case IEEE80211_ELEMID_RATES:
 1455                                 rates = frm;
 1456                                 break;
 1457                         case IEEE80211_ELEMID_XRATES:
 1458                                 xrates = frm;
 1459                                 break;
 1460                         case IEEE80211_ELEMID_MESHID:
 1461                                 meshid = frm;
 1462                                 break;
 1463                         }
 1464                         frm += frm[1] + 2;
 1465                 }
 1466                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 1467                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 1468                 if (xrates != NULL)
 1469                         IEEE80211_VERIFY_ELEMENT(xrates,
 1470                             IEEE80211_RATE_MAXSIZE - rates[1], return);
 1471                 if (meshid != NULL)
 1472                         IEEE80211_VERIFY_ELEMENT(meshid,
 1473                             IEEE80211_MESHID_LEN, return);
 1474                 /* NB: meshid, not ssid */
 1475                 IEEE80211_VERIFY_SSID(vap->iv_bss, meshid, return);
 1476 
 1477                 /* XXX find a better class or define it's own */
 1478                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 1479                     "%s", "recv probe req");
 1480                 /*
 1481                  * Some legacy 11b clients cannot hack a complete
 1482                  * probe response frame.  When the request includes
 1483                  * only a bare-bones rate set, communicate this to
 1484                  * the transmit side.
 1485                  */
 1486                 ieee80211_send_proberesp(vap, wh->i_addr2, 0);
 1487                 break;
 1488         }
 1489         case IEEE80211_FC0_SUBTYPE_ACTION:
 1490                 if (vap->iv_state != IEEE80211_S_RUN) {
 1491                         vap->iv_stats.is_rx_mgtdiscard++;
 1492                         break;
 1493                 }
 1494                 /*
 1495                  * We received an action for an unknown neighbor.
 1496                  * XXX: wait for it to beacon or create ieee80211_node?
 1497                  */
 1498                 if (ni == vap->iv_bss) {
 1499                         IEEE80211_DISCARD(vap, IEEE80211_MSG_MESH,
 1500                             wh, NULL, "%s", "unknown node");
 1501                         vap->iv_stats.is_rx_mgtdiscard++;
 1502                         break;
 1503                 }
 1504                 /*
 1505                  * Discard if not for us.
 1506                  */
 1507                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 1508                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1509                         IEEE80211_DISCARD(vap, IEEE80211_MSG_MESH,
 1510                             wh, NULL, "%s", "not for me");
 1511                         vap->iv_stats.is_rx_mgtdiscard++;
 1512                         break;
 1513                 }
 1514                 /* XXX parse_action is a bit useless now */
 1515                 if (ieee80211_parse_action(ni, m0) == 0)
 1516                         ic->ic_recv_action(ni, wh, frm, efrm);
 1517                 break;
 1518         case IEEE80211_FC0_SUBTYPE_AUTH:
 1519         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1520         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 1521         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 1522         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 1523         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 1524         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 1525                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1526                     wh, NULL, "%s", "not handled");
 1527                 vap->iv_stats.is_rx_mgtdiscard++;
 1528                 return;
 1529         default:
 1530                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1531                     wh, "mgt", "subtype 0x%x not handled", subtype);
 1532                 vap->iv_stats.is_rx_badsubtype++;
 1533                 break;
 1534         }
 1535 }
 1536 
 1537 /*
 1538  * Parse meshpeering action ie's for open+confirm frames; the
 1539  * important bits are returned in the supplied structure.
 1540  */
 1541 static const struct ieee80211_meshpeer_ie *
 1542 mesh_parse_meshpeering_action(struct ieee80211_node *ni,
 1543         const struct ieee80211_frame *wh,       /* XXX for VERIFY_LENGTH */
 1544         const uint8_t *frm, const uint8_t *efrm,
 1545         struct ieee80211_meshpeer_ie *mp, uint8_t subtype)
 1546 {
 1547         struct ieee80211vap *vap = ni->ni_vap;
 1548         const struct ieee80211_meshpeer_ie *mpie;
 1549         const uint8_t *meshid, *meshconf, *meshpeer;
 1550 
 1551         meshid = meshconf = meshpeer = NULL;
 1552         while (efrm - frm > 1) {
 1553                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return NULL);
 1554                 switch (*frm) {
 1555                 case IEEE80211_ELEMID_MESHID:
 1556                         meshid = frm;
 1557                         break;
 1558                 case IEEE80211_ELEMID_MESHCONF:
 1559                         meshconf = frm;
 1560                         break;
 1561                 case IEEE80211_ELEMID_MESHPEER:
 1562                         meshpeer = frm;
 1563                         mpie = (const struct ieee80211_meshpeer_ie *) frm;
 1564                         memset(mp, 0, sizeof(*mp));
 1565                         mp->peer_llinkid = LE_READ_2(&mpie->peer_llinkid);
 1566                         /* NB: peer link ID is optional on these frames */
 1567                         if (subtype == IEEE80211_MESH_PEER_LINK_CLOSE &&
 1568                             mpie->peer_len == 8) {
 1569                                 mp->peer_linkid = 0;
 1570                                 mp->peer_rcode = LE_READ_2(&mpie->peer_linkid);
 1571                         } else {
 1572                                 mp->peer_linkid = LE_READ_2(&mpie->peer_linkid);
 1573                                 mp->peer_rcode = LE_READ_2(&mpie->peer_rcode);
 1574                         }
 1575                         break;
 1576                 }
 1577                 frm += frm[1] + 2;
 1578         }
 1579 
 1580         /*
 1581          * Verify the contents of the frame. Action frames with
 1582          * close subtype don't have a Mesh Configuration IE.
 1583          * If if fails validation, close the peer link.
 1584          */
 1585         KASSERT(meshpeer != NULL &&
 1586             subtype != IEEE80211_ACTION_MESHPEERING_CLOSE,
 1587             ("parsing close action"));
 1588 
 1589         if (mesh_verify_meshid(vap, meshid) ||
 1590             mesh_verify_meshpeer(vap, subtype, meshpeer) ||
 1591             mesh_verify_meshconf(vap, meshconf)) {
 1592                 uint16_t args[3];
 1593 
 1594                 IEEE80211_DISCARD(vap,
 1595                     IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1596                     wh, NULL, "%s", "not for our mesh");
 1597                 vap->iv_stats.is_rx_mgtdiscard++;
 1598                 switch (ni->ni_mlstate) {
 1599                 case IEEE80211_NODE_MESH_IDLE:
 1600                 case IEEE80211_NODE_MESH_ESTABLISHED:
 1601                 case IEEE80211_NODE_MESH_HOLDING:
 1602                         /* ignore */
 1603                         break;
 1604                 case IEEE80211_NODE_MESH_OPENSNT:
 1605                 case IEEE80211_NODE_MESH_OPENRCV:
 1606                 case IEEE80211_NODE_MESH_CONFIRMRCV:
 1607                         args[0] = ni->ni_mlpid;
 1608                         args[1] = ni->ni_mllid;
 1609                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1610                         ieee80211_send_action(ni,
 1611                             IEEE80211_ACTION_CAT_MESHPEERING,
 1612                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1613                             args);
 1614                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1615                         mesh_peer_timeout_setup(ni);
 1616                         break;
 1617                 }
 1618                 return NULL;
 1619         }
 1620         return (const struct ieee80211_meshpeer_ie *) mp;
 1621 }
 1622 
 1623 static int
 1624 mesh_recv_action_meshpeering_open(struct ieee80211_node *ni,
 1625         const struct ieee80211_frame *wh,
 1626         const uint8_t *frm, const uint8_t *efrm)
 1627 {
 1628         struct ieee80211vap *vap = ni->ni_vap;
 1629         struct ieee80211_meshpeer_ie ie;
 1630         const struct ieee80211_meshpeer_ie *meshpeer;
 1631         uint16_t args[3];
 1632 
 1633         /* +2+2 for action + code + capabilites */
 1634         meshpeer = mesh_parse_meshpeering_action(ni, wh, frm+2+2, efrm, &ie,
 1635             IEEE80211_ACTION_MESHPEERING_OPEN);
 1636         if (meshpeer == NULL) {
 1637                 return 0;
 1638         }
 1639 
 1640         /* XXX move up */
 1641         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1642             "recv PEER OPEN, lid 0x%x", meshpeer->peer_llinkid);
 1643 
 1644         switch (ni->ni_mlstate) {
 1645         case IEEE80211_NODE_MESH_IDLE:
 1646                 mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENRCV);
 1647                 ni->ni_mllid = meshpeer->peer_llinkid;
 1648                 ni->ni_mlpid = mesh_generateid(vap);
 1649                 if (ni->ni_mlpid == 0)
 1650                         return 0;               /* XXX */
 1651                 args[0] = ni->ni_mlpid;
 1652                 /* Announce we're open too... */
 1653                 ieee80211_send_action(ni,
 1654                     IEEE80211_ACTION_CAT_MESHPEERING,
 1655                     IEEE80211_ACTION_MESHPEERING_OPEN, args);
 1656                 /* ...and confirm the link. */
 1657                 args[0] = ni->ni_mlpid;
 1658                 args[1] = ni->ni_mllid;
 1659                 ieee80211_send_action(ni,
 1660                     IEEE80211_ACTION_CAT_MESHPEERING,
 1661                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1662                     args);
 1663                 mesh_peer_timeout_setup(ni);
 1664                 break;
 1665         case IEEE80211_NODE_MESH_OPENRCV:
 1666                 /* Wrong Link ID */
 1667                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1668                         args[0] = ni->ni_mllid;
 1669                         args[1] = ni->ni_mlpid;
 1670                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1671                         ieee80211_send_action(ni,
 1672                             IEEE80211_ACTION_CAT_MESHPEERING,
 1673                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1674                             args);
 1675                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1676                         mesh_peer_timeout_setup(ni);
 1677                         break;
 1678                 }
 1679                 /* Duplicate open, confirm again. */
 1680                 args[0] = ni->ni_mlpid;
 1681                 args[1] = ni->ni_mllid;
 1682                 ieee80211_send_action(ni,
 1683                     IEEE80211_ACTION_CAT_MESHPEERING,
 1684                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1685                     args);
 1686                 break;
 1687         case IEEE80211_NODE_MESH_OPENSNT:
 1688                 ni->ni_mllid = meshpeer->peer_llinkid;
 1689                 mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENRCV);
 1690                 args[0] = ni->ni_mlpid;
 1691                 args[1] = ni->ni_mllid;
 1692                 ieee80211_send_action(ni,
 1693                     IEEE80211_ACTION_CAT_MESHPEERING,
 1694                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1695                     args);
 1696                 /* NB: don't setup/clear any timeout */
 1697                 break;
 1698         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1699                 if (ni->ni_mlpid != meshpeer->peer_linkid ||
 1700                     ni->ni_mllid != meshpeer->peer_llinkid) {
 1701                         args[0] = ni->ni_mlpid;
 1702                         args[1] = ni->ni_mllid;
 1703                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1704                         ieee80211_send_action(ni,
 1705                             IEEE80211_ACTION_CAT_MESHPEERING,
 1706                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1707                             args);
 1708                         mesh_linkchange(ni,
 1709                             IEEE80211_NODE_MESH_HOLDING);
 1710                         mesh_peer_timeout_setup(ni);
 1711                         break;
 1712                 }
 1713                 mesh_linkchange(ni, IEEE80211_NODE_MESH_ESTABLISHED);
 1714                 ni->ni_mllid = meshpeer->peer_llinkid;
 1715                 args[0] = ni->ni_mlpid;
 1716                 args[1] = ni->ni_mllid;
 1717                 ieee80211_send_action(ni,
 1718                     IEEE80211_ACTION_CAT_MESHPEERING,
 1719                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1720                     args);
 1721                 mesh_peer_timeout_stop(ni);
 1722                 break;
 1723         case IEEE80211_NODE_MESH_ESTABLISHED:
 1724                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1725                         args[0] = ni->ni_mllid;
 1726                         args[1] = ni->ni_mlpid;
 1727                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1728                         ieee80211_send_action(ni,
 1729                             IEEE80211_ACTION_CAT_MESHPEERING,
 1730                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1731                             args);
 1732                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1733                         mesh_peer_timeout_setup(ni);
 1734                         break;
 1735                 }
 1736                 args[0] = ni->ni_mlpid;
 1737                 args[1] = ni->ni_mllid;
 1738                 ieee80211_send_action(ni,
 1739                     IEEE80211_ACTION_CAT_MESHPEERING,
 1740                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1741                     args);
 1742                 break;
 1743         case IEEE80211_NODE_MESH_HOLDING:
 1744                 args[0] = ni->ni_mlpid;
 1745                 args[1] = meshpeer->peer_llinkid;
 1746                 args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 1747                 ieee80211_send_action(ni,
 1748                     IEEE80211_ACTION_CAT_MESHPEERING,
 1749                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1750                     args);
 1751                 break;
 1752         }
 1753         return 0;
 1754 }
 1755 
 1756 static int
 1757 mesh_recv_action_meshpeering_confirm(struct ieee80211_node *ni,
 1758         const struct ieee80211_frame *wh,
 1759         const uint8_t *frm, const uint8_t *efrm)
 1760 {
 1761         struct ieee80211vap *vap = ni->ni_vap;
 1762         struct ieee80211_meshpeer_ie ie;
 1763         const struct ieee80211_meshpeer_ie *meshpeer;
 1764         uint16_t args[3];
 1765 
 1766         /* +2+2+2+2 for action + code + capabilites + status code + AID */
 1767         meshpeer = mesh_parse_meshpeering_action(ni, wh, frm+2+2+2+2, efrm, &ie,
 1768             IEEE80211_ACTION_MESHPEERING_CONFIRM);
 1769         if (meshpeer == NULL) {
 1770                 return 0;
 1771         }
 1772 
 1773         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1774             "recv PEER CONFIRM, local id 0x%x, peer id 0x%x",
 1775             meshpeer->peer_llinkid, meshpeer->peer_linkid);
 1776 
 1777         switch (ni->ni_mlstate) {
 1778         case IEEE80211_NODE_MESH_OPENRCV:
 1779                 mesh_linkchange(ni, IEEE80211_NODE_MESH_ESTABLISHED);
 1780                 mesh_peer_timeout_stop(ni);
 1781                 break;
 1782         case IEEE80211_NODE_MESH_OPENSNT:
 1783                 mesh_linkchange(ni, IEEE80211_NODE_MESH_CONFIRMRCV);
 1784                 break;
 1785         case IEEE80211_NODE_MESH_HOLDING:
 1786                 args[0] = ni->ni_mlpid;
 1787                 args[1] = meshpeer->peer_llinkid;
 1788                 args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 1789                 ieee80211_send_action(ni,
 1790                     IEEE80211_ACTION_CAT_MESHPEERING,
 1791                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1792                     args);
 1793                 break;
 1794         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1795                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1796                         args[0] = ni->ni_mlpid;
 1797                         args[1] = ni->ni_mllid;
 1798                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1799                         ieee80211_send_action(ni,
 1800                             IEEE80211_ACTION_CAT_MESHPEERING,
 1801                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1802                             args);
 1803                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1804                         mesh_peer_timeout_setup(ni);
 1805                 }
 1806                 break;
 1807         default:
 1808                 IEEE80211_DISCARD(vap,
 1809                     IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1810                     wh, NULL, "received confirm in invalid state %d",
 1811                     ni->ni_mlstate);
 1812                 vap->iv_stats.is_rx_mgtdiscard++;
 1813                 break;
 1814         }
 1815         return 0;
 1816 }
 1817 
 1818 static int
 1819 mesh_recv_action_meshpeering_close(struct ieee80211_node *ni,
 1820         const struct ieee80211_frame *wh,
 1821         const uint8_t *frm, const uint8_t *efrm)
 1822 {
 1823         uint16_t args[3];
 1824 
 1825         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1826             ni, "%s", "recv PEER CLOSE");
 1827 
 1828         switch (ni->ni_mlstate) {
 1829         case IEEE80211_NODE_MESH_IDLE:
 1830                 /* ignore */
 1831                 break;
 1832         case IEEE80211_NODE_MESH_OPENRCV:
 1833         case IEEE80211_NODE_MESH_OPENSNT:
 1834         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1835         case IEEE80211_NODE_MESH_ESTABLISHED:
 1836                 args[0] = ni->ni_mlpid;
 1837                 args[1] = ni->ni_mllid;
 1838                 args[2] = IEEE80211_REASON_MESH_CLOSE_RCVD;
 1839                 ieee80211_send_action(ni,
 1840                     IEEE80211_ACTION_CAT_MESHPEERING,
 1841                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1842                     args);
 1843                 mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1844                 mesh_peer_timeout_setup(ni);
 1845                 break;
 1846         case IEEE80211_NODE_MESH_HOLDING:
 1847                 mesh_linkchange(ni, IEEE80211_NODE_MESH_IDLE);
 1848                 mesh_peer_timeout_setup(ni);
 1849                 break;
 1850         }
 1851         return 0;
 1852 }
 1853 
 1854 /*
 1855  * Link Metric handling.
 1856  */
 1857 static int
 1858 mesh_recv_action_meshlmetric_req(struct ieee80211_node *ni,
 1859         const struct ieee80211_frame *wh,
 1860         const uint8_t *frm, const uint8_t *efrm)
 1861 {
 1862         uint32_t metric;
 1863 
 1864         metric = mesh_airtime_calc(ni);
 1865         ieee80211_send_action(ni,
 1866             IEEE80211_ACTION_CAT_MESHLMETRIC,
 1867             IEEE80211_ACTION_MESHLMETRIC_REP,
 1868             &metric);
 1869         return 0;
 1870 }
 1871 
 1872 static int
 1873 mesh_recv_action_meshlmetric_rep(struct ieee80211_node *ni,
 1874         const struct ieee80211_frame *wh,
 1875         const uint8_t *frm, const uint8_t *efrm)
 1876 {
 1877         return 0;
 1878 }
 1879 
 1880 static int
 1881 mesh_send_action(struct ieee80211_node *ni, struct mbuf *m)
 1882 {
 1883         struct ieee80211_bpf_params params;
 1884 
 1885         memset(&params, 0, sizeof(params));
 1886         params.ibp_pri = WME_AC_VO;
 1887         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 1888         /* XXX ucast/mcast */
 1889         params.ibp_try0 = ni->ni_txparms->maxretry;
 1890         params.ibp_power = ni->ni_txpower;
 1891         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 1892              &params);
 1893 }
 1894 
 1895 #define ADDSHORT(frm, v) do {                   \
 1896         frm[0] = (v) & 0xff;                    \
 1897         frm[1] = (v) >> 8;                      \
 1898         frm += 2;                               \
 1899 } while (0)
 1900 #define ADDWORD(frm, v) do {                    \
 1901         frm[0] = (v) & 0xff;                    \
 1902         frm[1] = ((v) >> 8) & 0xff;             \
 1903         frm[2] = ((v) >> 16) & 0xff;            \
 1904         frm[3] = ((v) >> 24) & 0xff;            \
 1905         frm += 4;                               \
 1906 } while (0)
 1907 
 1908 static int
 1909 mesh_send_action_meshpeering_open(struct ieee80211_node *ni,
 1910         int category, int action, void *args0)
 1911 {
 1912         struct ieee80211vap *vap = ni->ni_vap;
 1913         struct ieee80211com *ic = ni->ni_ic;
 1914         uint16_t *args = args0;
 1915         const struct ieee80211_rateset *rs;
 1916         struct mbuf *m;
 1917         uint8_t *frm;
 1918 
 1919         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1920             "send PEER OPEN action: localid 0x%x", args[0]);
 1921 
 1922         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1923             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 1924             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 1925         ieee80211_ref_node(ni);
 1926 
 1927         m = ieee80211_getmgtframe(&frm,
 1928             ic->ic_headroom + sizeof(struct ieee80211_frame),
 1929             sizeof(uint16_t)    /* action+category */
 1930             + sizeof(uint16_t)  /* capabilites */
 1931             + 2 + IEEE80211_RATE_SIZE    
 1932             + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)         
 1933             + 2 + IEEE80211_MESHID_LEN
 1934             + sizeof(struct ieee80211_meshconf_ie)       
 1935             + sizeof(struct ieee80211_meshpeer_ie)
 1936         );
 1937         if (m != NULL) {
 1938                 /*
 1939                  * mesh peer open action frame format:
 1940                  *   [1] category
 1941                  *   [1] action
 1942                  *   [2] capabilities
 1943                  *   [tlv] rates
 1944                  *   [tlv] xrates
 1945                  *   [tlv] mesh id
 1946                  *   [tlv] mesh conf
 1947                  *   [tlv] mesh peer link mgmt
 1948                  */
 1949                 *frm++ = category;
 1950                 *frm++ = action;
 1951                 ADDSHORT(frm, ieee80211_getcapinfo(vap, ni->ni_chan));
 1952                 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 1953                 frm = ieee80211_add_rates(frm, rs);
 1954                 frm = ieee80211_add_xrates(frm, rs);
 1955                 frm = ieee80211_add_meshid(frm, vap);
 1956                 frm = ieee80211_add_meshconf(frm, vap);
 1957                 frm = ieee80211_add_meshpeer(frm, IEEE80211_MESH_PEER_LINK_OPEN,
 1958                     args[0], 0, 0);
 1959                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 1960                 return mesh_send_action(ni, m);
 1961         } else {
 1962                 vap->iv_stats.is_tx_nobuf++;
 1963                 ieee80211_free_node(ni);
 1964                 return ENOMEM;
 1965         }
 1966 }
 1967 
 1968 static int
 1969 mesh_send_action_meshpeering_confirm(struct ieee80211_node *ni,
 1970         int category, int action, void *args0)
 1971 {
 1972         struct ieee80211vap *vap = ni->ni_vap;
 1973         struct ieee80211com *ic = ni->ni_ic;
 1974         uint16_t *args = args0;
 1975         const struct ieee80211_rateset *rs;
 1976         struct mbuf *m;
 1977         uint8_t *frm;
 1978 
 1979         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1980             "send PEER CONFIRM action: localid 0x%x, peerid 0x%x",
 1981             args[0], args[1]);
 1982 
 1983         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1984             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 1985             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 1986         ieee80211_ref_node(ni);
 1987 
 1988         m = ieee80211_getmgtframe(&frm,
 1989             ic->ic_headroom + sizeof(struct ieee80211_frame),
 1990             sizeof(uint16_t)    /* action+category */
 1991             + sizeof(uint16_t)  /* capabilites */
 1992             + sizeof(uint16_t)  /* status code */
 1993             + sizeof(uint16_t)  /* AID */
 1994             + 2 + IEEE80211_RATE_SIZE    
 1995             + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)         
 1996             + 2 + IEEE80211_MESHID_LEN
 1997             + sizeof(struct ieee80211_meshconf_ie)       
 1998             + sizeof(struct ieee80211_meshpeer_ie)
 1999         );
 2000         if (m != NULL) {
 2001                 /*
 2002                  * mesh peer confirm action frame format:
 2003                  *   [1] category
 2004                  *   [1] action
 2005                  *   [2] capabilities
 2006                  *   [2] status code
 2007                  *   [2] association id (peer ID)
 2008                  *   [tlv] rates
 2009                  *   [tlv] xrates
 2010                  *   [tlv] mesh id
 2011                  *   [tlv] mesh conf
 2012                  *   [tlv] mesh peer link mgmt
 2013                  */
 2014                 *frm++ = category;
 2015                 *frm++ = action;
 2016                 ADDSHORT(frm, ieee80211_getcapinfo(vap, ni->ni_chan));
 2017                 ADDSHORT(frm, 0);               /* status code */
 2018                 ADDSHORT(frm, args[1]);         /* AID */
 2019                 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 2020                 frm = ieee80211_add_rates(frm, rs);
 2021                 frm = ieee80211_add_xrates(frm, rs);
 2022                 frm = ieee80211_add_meshid(frm, vap);
 2023                 frm = ieee80211_add_meshconf(frm, vap);
 2024                 frm = ieee80211_add_meshpeer(frm,
 2025                     IEEE80211_MESH_PEER_LINK_CONFIRM,
 2026                     args[0], args[1], 0);
 2027                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2028                 return mesh_send_action(ni, m);
 2029         } else {
 2030                 vap->iv_stats.is_tx_nobuf++;
 2031                 ieee80211_free_node(ni);
 2032                 return ENOMEM;
 2033         }
 2034 }
 2035 
 2036 static int
 2037 mesh_send_action_meshpeering_close(struct ieee80211_node *ni,
 2038         int category, int action, void *args0)
 2039 {
 2040         struct ieee80211vap *vap = ni->ni_vap;
 2041         struct ieee80211com *ic = ni->ni_ic;
 2042         uint16_t *args = args0;
 2043         struct mbuf *m;
 2044         uint8_t *frm;
 2045 
 2046         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2047             "send PEER CLOSE action: localid 0x%x, peerid 0x%x reason %d",
 2048             args[0], args[1], args[2]);
 2049 
 2050         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2051             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2052             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2053         ieee80211_ref_node(ni);
 2054 
 2055         m = ieee80211_getmgtframe(&frm,
 2056             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2057             sizeof(uint16_t)    /* action+category */
 2058             + sizeof(uint16_t)  /* reason code */
 2059             + 2 + IEEE80211_MESHID_LEN
 2060             + sizeof(struct ieee80211_meshpeer_ie) 
 2061         );
 2062         if (m != NULL) {
 2063                 /*
 2064                  * mesh peer close action frame format:
 2065                  *   [1] category
 2066                  *   [1] action
 2067                  *   [2] reason code
 2068                  *   [tlv] mesh id
 2069                  *   [tlv] mesh peer link mgmt
 2070                  */
 2071                 *frm++ = category;
 2072                 *frm++ = action;
 2073                 ADDSHORT(frm, args[2]);         /* reason code */
 2074                 frm = ieee80211_add_meshid(frm, vap);
 2075                 frm = ieee80211_add_meshpeer(frm,
 2076                     IEEE80211_MESH_PEER_LINK_CLOSE,
 2077                     args[0], args[1], args[2]);
 2078                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2079                 return mesh_send_action(ni, m);
 2080         } else {
 2081                 vap->iv_stats.is_tx_nobuf++;
 2082                 ieee80211_free_node(ni);
 2083                 return ENOMEM;
 2084         }
 2085 }
 2086 
 2087 static int
 2088 mesh_send_action_meshlink_request(struct ieee80211_node *ni,
 2089         int category, int action, void *arg0)
 2090 {
 2091         struct ieee80211vap *vap = ni->ni_vap;
 2092         struct ieee80211com *ic = ni->ni_ic;
 2093         struct mbuf *m;
 2094         uint8_t *frm;
 2095 
 2096         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2097             "%s", "send LINK METRIC REQUEST action");
 2098 
 2099         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2100             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2101             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2102         ieee80211_ref_node(ni);
 2103 
 2104         m = ieee80211_getmgtframe(&frm,
 2105             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2106             sizeof(uint16_t)    /* action+category */
 2107         );
 2108         if (m != NULL) {
 2109                 /*
 2110                  * mesh link metric request
 2111                  *   [1] category
 2112                  *   [1] action
 2113                  */
 2114                 *frm++ = category;
 2115                 *frm++ = action;
 2116                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2117                 return mesh_send_action(ni, m);
 2118         } else {
 2119                 vap->iv_stats.is_tx_nobuf++;
 2120                 ieee80211_free_node(ni);
 2121                 return ENOMEM;
 2122         }
 2123 }
 2124 
 2125 static int
 2126 mesh_send_action_meshlink_reply(struct ieee80211_node *ni,
 2127         int category, int action, void *args0)
 2128 {
 2129         struct ieee80211vap *vap = ni->ni_vap;
 2130         struct ieee80211com *ic = ni->ni_ic;
 2131         uint32_t *metric = args0;
 2132         struct mbuf *m;
 2133         uint8_t *frm;
 2134 
 2135         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2136             "send LINK METRIC REPLY action: metric 0x%x", *metric);
 2137 
 2138         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2139             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2140             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2141         ieee80211_ref_node(ni);
 2142 
 2143         m = ieee80211_getmgtframe(&frm,
 2144             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2145             sizeof(uint16_t)    /* action+category */
 2146             + sizeof(struct ieee80211_meshlmetric_ie)
 2147         );
 2148         if (m != NULL) {
 2149                 /*
 2150                  * mesh link metric reply
 2151                  *   [1] category
 2152                  *   [1] action
 2153                  *   [tlv] mesh link metric
 2154                  */
 2155                 *frm++ = category;
 2156                 *frm++ = action;
 2157                 frm = ieee80211_add_meshlmetric(frm, *metric);
 2158                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2159                 return mesh_send_action(ni, m);
 2160         } else {
 2161                 vap->iv_stats.is_tx_nobuf++;
 2162                 ieee80211_free_node(ni);
 2163                 return ENOMEM;
 2164         }
 2165 }
 2166 
 2167 static void
 2168 mesh_peer_timeout_setup(struct ieee80211_node *ni)
 2169 {
 2170         switch (ni->ni_mlstate) {
 2171         case IEEE80211_NODE_MESH_HOLDING:
 2172                 ni->ni_mltval = ieee80211_mesh_holdingtimeout;
 2173                 break;
 2174         case IEEE80211_NODE_MESH_CONFIRMRCV:
 2175                 ni->ni_mltval = ieee80211_mesh_confirmtimeout;
 2176                 break;
 2177         case IEEE80211_NODE_MESH_IDLE:
 2178                 ni->ni_mltval = 0;
 2179                 break;
 2180         default:
 2181                 ni->ni_mltval = ieee80211_mesh_retrytimeout;
 2182                 break;
 2183         }
 2184         if (ni->ni_mltval)
 2185                 callout_reset(&ni->ni_mltimer, ni->ni_mltval,
 2186                     mesh_peer_timeout_cb, ni);
 2187 }
 2188 
 2189 /*
 2190  * Same as above but backoffs timer statisically 50%.
 2191  */
 2192 static void
 2193 mesh_peer_timeout_backoff(struct ieee80211_node *ni)
 2194 {
 2195         uint32_t r;
 2196         
 2197         r = arc4random();
 2198         ni->ni_mltval += r % ni->ni_mltval;
 2199         callout_reset(&ni->ni_mltimer, ni->ni_mltval, mesh_peer_timeout_cb,
 2200             ni);
 2201 }
 2202 
 2203 static __inline void
 2204 mesh_peer_timeout_stop(struct ieee80211_node *ni)
 2205 {
 2206         callout_drain(&ni->ni_mltimer);
 2207 }
 2208 
 2209 /*
 2210  * Mesh Peer Link Management FSM timeout handling.
 2211  */
 2212 static void
 2213 mesh_peer_timeout_cb(void *arg)
 2214 {
 2215         struct ieee80211_node *ni = (struct ieee80211_node *)arg;
 2216         uint16_t args[3];
 2217 
 2218         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_MESH,
 2219             ni, "mesh link timeout, state %d, retry counter %d",
 2220             ni->ni_mlstate, ni->ni_mlrcnt);
 2221         
 2222         switch (ni->ni_mlstate) {
 2223         case IEEE80211_NODE_MESH_IDLE:
 2224         case IEEE80211_NODE_MESH_ESTABLISHED:
 2225                 break;
 2226         case IEEE80211_NODE_MESH_OPENSNT:
 2227         case IEEE80211_NODE_MESH_OPENRCV:
 2228                 if (ni->ni_mlrcnt == ieee80211_mesh_maxretries) {
 2229                         args[0] = ni->ni_mlpid;
 2230                         args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 2231                         ieee80211_send_action(ni,
 2232                             IEEE80211_ACTION_CAT_MESHPEERING,
 2233                             IEEE80211_ACTION_MESHPEERING_CLOSE, args);
 2234                         ni->ni_mlrcnt = 0;
 2235                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 2236                         mesh_peer_timeout_setup(ni);
 2237                 } else {
 2238                         args[0] = ni->ni_mlpid;
 2239                         ieee80211_send_action(ni,
 2240                             IEEE80211_ACTION_CAT_MESHPEERING,
 2241                             IEEE80211_ACTION_MESHPEERING_OPEN, args);
 2242                         ni->ni_mlrcnt++;
 2243                         mesh_peer_timeout_backoff(ni);
 2244                 }
 2245                 break;
 2246         case IEEE80211_NODE_MESH_CONFIRMRCV:
 2247                 if (ni->ni_mlrcnt == ieee80211_mesh_maxretries) {
 2248                         args[0] = ni->ni_mlpid;
 2249                         args[2] = IEEE80211_REASON_MESH_CONFIRM_TIMEOUT;
 2250                         ieee80211_send_action(ni,
 2251                             IEEE80211_ACTION_CAT_MESHPEERING,
 2252                             IEEE80211_ACTION_MESHPEERING_CLOSE, args);
 2253                         ni->ni_mlrcnt = 0;
 2254                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 2255                         mesh_peer_timeout_setup(ni);
 2256                 } else {
 2257                         ni->ni_mlrcnt++;
 2258                         mesh_peer_timeout_setup(ni);
 2259                 }
 2260                 break;
 2261         case IEEE80211_NODE_MESH_HOLDING:
 2262                 mesh_linkchange(ni, IEEE80211_NODE_MESH_IDLE);
 2263                 break;
 2264         }
 2265 }
 2266 
 2267 static int
 2268 mesh_verify_meshid(struct ieee80211vap *vap, const uint8_t *ie)
 2269 {
 2270         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2271 
 2272         if (ie == NULL || ie[1] != ms->ms_idlen)
 2273                 return 1;
 2274         return memcmp(ms->ms_id, ie + 2, ms->ms_idlen);
 2275 }
 2276 
 2277 /*
 2278  * Check if we are using the same algorithms for this mesh.
 2279  */
 2280 static int
 2281 mesh_verify_meshconf(struct ieee80211vap *vap, const uint8_t *ie)
 2282 {
 2283         const struct ieee80211_meshconf_ie *meshconf =
 2284             (const struct ieee80211_meshconf_ie *) ie;
 2285         const struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2286 
 2287         if (meshconf == NULL)
 2288                 return 1;
 2289         if (meshconf->conf_pselid != ms->ms_ppath->mpp_ie) {
 2290                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2291                     "unknown path selection algorithm: 0x%x\n",
 2292                     meshconf->conf_pselid);
 2293                 return 1;
 2294         }
 2295         if (meshconf->conf_pmetid != ms->ms_pmetric->mpm_ie) {
 2296                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2297                     "unknown path metric algorithm: 0x%x\n",
 2298                     meshconf->conf_pmetid);
 2299                 return 1;
 2300         }
 2301         if (meshconf->conf_ccid != 0) {
 2302                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2303                     "unknown congestion control algorithm: 0x%x\n",
 2304                     meshconf->conf_ccid);
 2305                 return 1;
 2306         }
 2307         if (meshconf->conf_syncid != IEEE80211_MESHCONF_SYNC_NEIGHOFF) {
 2308                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2309                     "unknown sync algorithm: 0x%x\n",
 2310                     meshconf->conf_syncid);
 2311                 return 1;
 2312         }
 2313         if (meshconf->conf_authid != 0) {
 2314                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2315                     "unknown auth auth algorithm: 0x%x\n",
 2316                     meshconf->conf_pselid);
 2317                 return 1;
 2318         }
 2319         /* Not accepting peers */
 2320         if (!(meshconf->conf_cap & IEEE80211_MESHCONF_CAP_AP)) {
 2321                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2322                     "not accepting peers: 0x%x\n", meshconf->conf_cap);
 2323                 return 1;
 2324         }
 2325         return 0;
 2326 }
 2327 
 2328 static int
 2329 mesh_verify_meshpeer(struct ieee80211vap *vap, uint8_t subtype,
 2330     const uint8_t *ie)
 2331 {
 2332         const struct ieee80211_meshpeer_ie *meshpeer =
 2333             (const struct ieee80211_meshpeer_ie *) ie;
 2334 
 2335         if (meshpeer == NULL || meshpeer->peer_len < 6 ||
 2336             meshpeer->peer_len > 10)
 2337                 return 1;
 2338         switch (subtype) {
 2339         case IEEE80211_MESH_PEER_LINK_OPEN:
 2340                 if (meshpeer->peer_len != 6)
 2341                         return 1;
 2342                 break;
 2343         case IEEE80211_MESH_PEER_LINK_CONFIRM:
 2344                 if (meshpeer->peer_len != 8)
 2345                         return 1;
 2346                 break;
 2347         case IEEE80211_MESH_PEER_LINK_CLOSE:
 2348                 if (meshpeer->peer_len < 8)
 2349                         return 1;
 2350                 if (meshpeer->peer_len == 8 && meshpeer->peer_linkid != 0)
 2351                         return 1;
 2352                 if (meshpeer->peer_rcode == 0)
 2353                         return 1;
 2354                 break;
 2355         }
 2356         return 0;
 2357 }
 2358 
 2359 /*
 2360  * Add a Mesh ID IE to a frame.
 2361  */
 2362 uint8_t *
 2363 ieee80211_add_meshid(uint8_t *frm, struct ieee80211vap *vap)
 2364 {
 2365         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2366 
 2367         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, ("not a mbss vap"));
 2368 
 2369         *frm++ = IEEE80211_ELEMID_MESHID;
 2370         *frm++ = ms->ms_idlen;
 2371         memcpy(frm, ms->ms_id, ms->ms_idlen);
 2372         return frm + ms->ms_idlen;
 2373 }
 2374 
 2375 /*
 2376  * Add a Mesh Configuration IE to a frame.
 2377  * For now just use HWMP routing, Airtime link metric, Null Congestion
 2378  * Signaling, Null Sync Protocol and Null Authentication.
 2379  */
 2380 uint8_t *
 2381 ieee80211_add_meshconf(uint8_t *frm, struct ieee80211vap *vap)
 2382 {
 2383         const struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2384 
 2385         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, ("not a MBSS vap"));
 2386 
 2387         *frm++ = IEEE80211_ELEMID_MESHCONF;
 2388         *frm++ = sizeof(struct ieee80211_meshconf_ie) - 2;
 2389         *frm++ = ms->ms_ppath->mpp_ie;          /* path selection */
 2390         *frm++ = ms->ms_pmetric->mpm_ie;        /* link metric */
 2391         *frm++ = IEEE80211_MESHCONF_CC_DISABLED;
 2392         *frm++ = IEEE80211_MESHCONF_SYNC_NEIGHOFF;
 2393         *frm++ = IEEE80211_MESHCONF_AUTH_DISABLED;
 2394         /* NB: set the number of neighbors before the rest */
 2395         *frm = (ms->ms_neighbors > 15 ? 15 : ms->ms_neighbors) << 1;
 2396         if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
 2397                 *frm |= IEEE80211_MESHCONF_FORM_MP;
 2398         frm += 1;
 2399         if (ms->ms_flags & IEEE80211_MESHFLAGS_AP)
 2400                 *frm |= IEEE80211_MESHCONF_CAP_AP;
 2401         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)
 2402                 *frm |= IEEE80211_MESHCONF_CAP_FWRD;
 2403         frm += 1;
 2404         return frm;
 2405 }
 2406 
 2407 /*
 2408  * Add a Mesh Peer Management IE to a frame.
 2409  */
 2410 uint8_t *
 2411 ieee80211_add_meshpeer(uint8_t *frm, uint8_t subtype, uint16_t localid,
 2412     uint16_t peerid, uint16_t reason)
 2413 {
 2414         /* XXX change for AH */
 2415         static const uint8_t meshpeerproto[4] = IEEE80211_MESH_PEER_PROTO;
 2416 
 2417         KASSERT(localid != 0, ("localid == 0"));
 2418 
 2419         *frm++ = IEEE80211_ELEMID_MESHPEER;
 2420         switch (subtype) {
 2421         case IEEE80211_MESH_PEER_LINK_OPEN:
 2422                 *frm++ = 6;             /* length */
 2423                 memcpy(frm, meshpeerproto, 4);
 2424                 frm += 4;
 2425                 ADDSHORT(frm, localid); /* local ID */
 2426                 break;
 2427         case IEEE80211_MESH_PEER_LINK_CONFIRM:
 2428                 KASSERT(peerid != 0, ("sending peer confirm without peer id"));
 2429                 *frm++ = 8;             /* length */
 2430                 memcpy(frm, meshpeerproto, 4);
 2431                 frm += 4;
 2432                 ADDSHORT(frm, localid); /* local ID */
 2433                 ADDSHORT(frm, peerid);  /* peer ID */
 2434                 break;
 2435         case IEEE80211_MESH_PEER_LINK_CLOSE:
 2436                 if (peerid)
 2437                         *frm++ = 10;    /* length */
 2438                 else
 2439                         *frm++ = 8;     /* length */
 2440                 memcpy(frm, meshpeerproto, 4);
 2441                 frm += 4;
 2442                 ADDSHORT(frm, localid); /* local ID */
 2443                 if (peerid)
 2444                         ADDSHORT(frm, peerid);  /* peer ID */
 2445                 ADDSHORT(frm, reason);
 2446                 break;
 2447         }
 2448         return frm;
 2449 }
 2450 
 2451 /*
 2452  * Compute an Airtime Link Metric for the link with this node.
 2453  *
 2454  * Based on Draft 3.0 spec (11B.10, p.149).
 2455  */
 2456 /*
 2457  * Max 802.11s overhead.
 2458  */
 2459 #define IEEE80211_MESH_MAXOVERHEAD \
 2460         (sizeof(struct ieee80211_qosframe_addr4) \
 2461          + sizeof(struct ieee80211_meshcntl_ae11) \
 2462         + sizeof(struct llc) \
 2463         + IEEE80211_ADDR_LEN \
 2464         + IEEE80211_WEP_IVLEN \
 2465         + IEEE80211_WEP_KIDLEN \
 2466         + IEEE80211_WEP_CRCLEN \
 2467         + IEEE80211_WEP_MICLEN \
 2468         + IEEE80211_CRC_LEN)
 2469 uint32_t
 2470 mesh_airtime_calc(struct ieee80211_node *ni)
 2471 {
 2472 #define M_BITS 8
 2473 #define S_FACTOR (2 * M_BITS)
 2474         struct ieee80211com *ic = ni->ni_ic;
 2475         struct ifnet *ifp = ni->ni_vap->iv_ifp;
 2476         const static int nbits = 8192 << M_BITS;
 2477         uint32_t overhead, rate, errrate;
 2478         uint64_t res;
 2479 
 2480         /* Time to transmit a frame */
 2481         rate = ni->ni_txrate;
 2482         overhead = ieee80211_compute_duration(ic->ic_rt,
 2483             ifp->if_mtu + IEEE80211_MESH_MAXOVERHEAD, rate, 0) << M_BITS;
 2484         /* Error rate in percentage */
 2485         /* XXX assuming small failures are ok */
 2486         errrate = (((ifp->if_oerrors +
 2487             ifp->if_ierrors) / 100) << M_BITS) / 100;
 2488         res = (overhead + (nbits / rate)) *
 2489             ((1 << S_FACTOR) / ((1 << M_BITS) - errrate));
 2490 
 2491         return (uint32_t)(res >> S_FACTOR);
 2492 #undef M_BITS
 2493 #undef S_FACTOR
 2494 }
 2495 
 2496 /*
 2497  * Add a Mesh Link Metric report IE to a frame.
 2498  */
 2499 uint8_t *
 2500 ieee80211_add_meshlmetric(uint8_t *frm, uint32_t metric)
 2501 {
 2502         *frm++ = IEEE80211_ELEMID_MESHLINK;
 2503         *frm++ = 4;
 2504         ADDWORD(frm, metric);
 2505         return frm;
 2506 }
 2507 #undef ADDSHORT
 2508 #undef ADDWORD
 2509 
 2510 /*
 2511  * Initialize any mesh-specific node state.
 2512  */
 2513 void
 2514 ieee80211_mesh_node_init(struct ieee80211vap *vap, struct ieee80211_node *ni)
 2515 {
 2516         ni->ni_flags |= IEEE80211_NODE_QOS;
 2517         callout_init(&ni->ni_mltimer, CALLOUT_MPSAFE);
 2518 }
 2519 
 2520 /*
 2521  * Cleanup any mesh-specific node state.
 2522  */
 2523 void
 2524 ieee80211_mesh_node_cleanup(struct ieee80211_node *ni)
 2525 {
 2526         struct ieee80211vap *vap = ni->ni_vap;
 2527         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2528 
 2529         callout_drain(&ni->ni_mltimer);
 2530         /* NB: short-circuit callbacks after mesh_vdetach */
 2531         if (vap->iv_mesh != NULL)
 2532                 ms->ms_ppath->mpp_peerdown(ni);
 2533 }
 2534 
 2535 void
 2536 ieee80211_parse_meshid(struct ieee80211_node *ni, const uint8_t *ie)
 2537 {
 2538         ni->ni_meshidlen = ie[1];
 2539         memcpy(ni->ni_meshid, ie + 2, ie[1]);
 2540 }
 2541 
 2542 /*
 2543  * Setup mesh-specific node state on neighbor discovery.
 2544  */
 2545 void
 2546 ieee80211_mesh_init_neighbor(struct ieee80211_node *ni,
 2547         const struct ieee80211_frame *wh,
 2548         const struct ieee80211_scanparams *sp)
 2549 {
 2550         ieee80211_parse_meshid(ni, sp->meshid);
 2551 }
 2552 
 2553 void
 2554 ieee80211_mesh_update_beacon(struct ieee80211vap *vap,
 2555         struct ieee80211_beacon_offsets *bo)
 2556 {
 2557         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, ("not a MBSS vap"));
 2558 
 2559         if (isset(bo->bo_flags, IEEE80211_BEACON_MESHCONF)) {
 2560                 (void)ieee80211_add_meshconf(bo->bo_meshconf, vap);
 2561                 clrbit(bo->bo_flags, IEEE80211_BEACON_MESHCONF);
 2562         }
 2563 }
 2564 
 2565 static int
 2566 mesh_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2567 {
 2568         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2569         uint8_t tmpmeshid[IEEE80211_NWID_LEN];
 2570         struct ieee80211_mesh_route *rt;
 2571         struct ieee80211req_mesh_route *imr;
 2572         size_t len, off;
 2573         uint8_t *p;
 2574         int error;
 2575 
 2576         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2577                 return ENOSYS;
 2578 
 2579         error = 0;
 2580         switch (ireq->i_type) {
 2581         case IEEE80211_IOC_MESH_ID:
 2582                 ireq->i_len = ms->ms_idlen;
 2583                 memcpy(tmpmeshid, ms->ms_id, ireq->i_len);
 2584                 error = copyout(tmpmeshid, ireq->i_data, ireq->i_len);
 2585                 break;
 2586         case IEEE80211_IOC_MESH_AP:
 2587                 ireq->i_val = (ms->ms_flags & IEEE80211_MESHFLAGS_AP) != 0;
 2588                 break;
 2589         case IEEE80211_IOC_MESH_FWRD:
 2590                 ireq->i_val = (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) != 0;
 2591                 break;
 2592         case IEEE80211_IOC_MESH_TTL:
 2593                 ireq->i_val = ms->ms_ttl;
 2594                 break;
 2595         case IEEE80211_IOC_MESH_RTCMD:
 2596                 switch (ireq->i_val) {
 2597                 case IEEE80211_MESH_RTCMD_LIST:
 2598                         len = 0;
 2599                         MESH_RT_LOCK(ms);
 2600                         TAILQ_FOREACH(rt, &ms->ms_routes, rt_next) {
 2601                                 len += sizeof(*imr);
 2602                         }
 2603                         MESH_RT_UNLOCK(ms);
 2604                         if (len > ireq->i_len || ireq->i_len < sizeof(*imr)) {
 2605                                 ireq->i_len = len;
 2606                                 return ENOMEM;
 2607                         }
 2608                         ireq->i_len = len;
 2609                         /* XXX M_WAIT? */
 2610                         p = malloc(len, M_TEMP, M_NOWAIT | M_ZERO);
 2611                         if (p == NULL)
 2612                                 return ENOMEM;
 2613                         off = 0;
 2614                         MESH_RT_LOCK(ms);
 2615                         TAILQ_FOREACH(rt, &ms->ms_routes, rt_next) {
 2616                                 if (off >= len)
 2617                                         break;
 2618                                 imr = (struct ieee80211req_mesh_route *)
 2619                                     (p + off);
 2620                                 imr->imr_flags = rt->rt_flags;
 2621                                 IEEE80211_ADDR_COPY(imr->imr_dest,
 2622                                     rt->rt_dest);
 2623                                 IEEE80211_ADDR_COPY(imr->imr_nexthop,
 2624                                     rt->rt_nexthop);
 2625                                 imr->imr_metric = rt->rt_metric;
 2626                                 imr->imr_nhops = rt->rt_nhops;
 2627                                 imr->imr_lifetime = rt->rt_lifetime;
 2628                                 imr->imr_lastmseq = rt->rt_lastmseq;
 2629                                 off += sizeof(*imr);
 2630                         }
 2631                         MESH_RT_UNLOCK(ms);
 2632                         error = copyout(p, (uint8_t *)ireq->i_data,
 2633                             ireq->i_len);
 2634                         free(p, M_TEMP);
 2635                         break;
 2636                 case IEEE80211_MESH_RTCMD_FLUSH:
 2637                 case IEEE80211_MESH_RTCMD_ADD:
 2638                 case IEEE80211_MESH_RTCMD_DELETE:
 2639                         return EINVAL;
 2640                 default:
 2641                         return ENOSYS;
 2642                 }
 2643                 break;
 2644         case IEEE80211_IOC_MESH_PR_METRIC:
 2645                 len = strlen(ms->ms_pmetric->mpm_descr);
 2646                 if (ireq->i_len < len)
 2647                         return EINVAL;
 2648                 ireq->i_len = len;
 2649                 error = copyout(ms->ms_pmetric->mpm_descr,
 2650                     (uint8_t *)ireq->i_data, len);
 2651                 break;
 2652         case IEEE80211_IOC_MESH_PR_PATH:
 2653                 len = strlen(ms->ms_ppath->mpp_descr);
 2654                 if (ireq->i_len < len)
 2655                         return EINVAL;
 2656                 ireq->i_len = len;
 2657                 error = copyout(ms->ms_ppath->mpp_descr,
 2658                     (uint8_t *)ireq->i_data, len);
 2659                 break;
 2660         default:
 2661                 return ENOSYS;
 2662         }
 2663 
 2664         return error;
 2665 }
 2666 IEEE80211_IOCTL_GET(mesh, mesh_ioctl_get80211);
 2667 
 2668 static int
 2669 mesh_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2670 {
 2671         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2672         uint8_t tmpmeshid[IEEE80211_NWID_LEN];
 2673         uint8_t tmpaddr[IEEE80211_ADDR_LEN];
 2674         char tmpproto[IEEE80211_MESH_PROTO_DSZ];
 2675         int error;
 2676 
 2677         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2678                 return ENOSYS;
 2679 
 2680         error = 0;
 2681         switch (ireq->i_type) {
 2682         case IEEE80211_IOC_MESH_ID:
 2683                 if (ireq->i_val != 0 || ireq->i_len > IEEE80211_MESHID_LEN)
 2684                         return EINVAL;
 2685                 error = copyin(ireq->i_data, tmpmeshid, ireq->i_len);
 2686                 if (error != 0)
 2687                         break;
 2688                 memset(ms->ms_id, 0, IEEE80211_NWID_LEN);
 2689                 ms->ms_idlen = ireq->i_len;
 2690                 memcpy(ms->ms_id, tmpmeshid, ireq->i_len);
 2691                 error = ENETRESET;
 2692                 break;
 2693         case IEEE80211_IOC_MESH_AP:
 2694                 if (ireq->i_val)
 2695                         ms->ms_flags |= IEEE80211_MESHFLAGS_AP;
 2696                 else
 2697                         ms->ms_flags &= ~IEEE80211_MESHFLAGS_AP;
 2698                 error = ENETRESET;
 2699                 break;
 2700         case IEEE80211_IOC_MESH_FWRD:
 2701                 if (ireq->i_val)
 2702                         ms->ms_flags |= IEEE80211_MESHFLAGS_FWD;
 2703                 else
 2704                         ms->ms_flags &= ~IEEE80211_MESHFLAGS_FWD;
 2705                 break;
 2706         case IEEE80211_IOC_MESH_TTL:
 2707                 ms->ms_ttl = (uint8_t) ireq->i_val;
 2708                 break;
 2709         case IEEE80211_IOC_MESH_RTCMD:
 2710                 switch (ireq->i_val) {
 2711                 case IEEE80211_MESH_RTCMD_LIST:
 2712                         return EINVAL;
 2713                 case IEEE80211_MESH_RTCMD_FLUSH:
 2714                         ieee80211_mesh_rt_flush(vap);
 2715                         break;
 2716                 case IEEE80211_MESH_RTCMD_ADD:
 2717                         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, ireq->i_data) ||
 2718                             IEEE80211_ADDR_EQ(broadcastaddr, ireq->i_data))
 2719                                 return EINVAL;
 2720                         error = copyin(ireq->i_data, &tmpaddr,
 2721                             IEEE80211_ADDR_LEN);
 2722                         if (error == 0)
 2723                                 ieee80211_mesh_discover(vap, tmpaddr, NULL);
 2724                         break;
 2725                 case IEEE80211_MESH_RTCMD_DELETE:
 2726                         ieee80211_mesh_rt_del(vap, ireq->i_data);
 2727                         break;
 2728                 default:
 2729                         return ENOSYS;
 2730                 }
 2731                 break;
 2732         case IEEE80211_IOC_MESH_PR_METRIC:
 2733                 error = copyin(ireq->i_data, tmpproto, sizeof(tmpproto));
 2734                 if (error == 0) {
 2735                         error = mesh_select_proto_metric(vap, tmpproto);
 2736                         if (error == 0)
 2737                                 error = ENETRESET;
 2738                 }
 2739                 break;
 2740         case IEEE80211_IOC_MESH_PR_PATH:
 2741                 error = copyin(ireq->i_data, tmpproto, sizeof(tmpproto));
 2742                 if (error == 0) {
 2743                         error = mesh_select_proto_path(vap, tmpproto);
 2744                         if (error == 0)
 2745                                 error = ENETRESET;
 2746                 }
 2747                 break;
 2748         default:
 2749                 return ENOSYS;
 2750         }
 2751         return error;
 2752 }
 2753 IEEE80211_IOCTL_SET(mesh, mesh_ioctl_set80211);

Cache object: 172f48f2ee6a30938f2a9024216961a2


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.