The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_mesh.c

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    1 /*- 
    2  * Copyright (c) 2009 The FreeBSD Foundation 
    3  * All rights reserved. 
    4  * 
    5  * This software was developed by Rui Paulo under sponsorship from the
    6  * FreeBSD Foundation. 
    7  *  
    8  * Redistribution and use in source and binary forms, with or without 
    9  * modification, are permitted provided that the following conditions 
   10  * are met: 
   11  * 1. Redistributions of source code must retain the above copyright 
   12  *    notice, this list of conditions and the following disclaimer. 
   13  * 2. Redistributions in binary form must reproduce the above copyright 
   14  *    notice, this list of conditions and the following disclaimer in the 
   15  *    documentation and/or other materials provided with the distribution. 
   16  * 
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
   27  * SUCH DAMAGE. 
   28  */ 
   29 #include <sys/cdefs.h>
   30 #ifdef __FreeBSD__
   31 __FBSDID("$FreeBSD: releng/8.0/sys/net80211/ieee80211_mesh.c 198188 2009-10-17 13:42:23Z rpaulo $");
   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                         if (vap->iv_state == IEEE80211_S_RUN)
  392                                 vap->iv_newstate(vap, IEEE80211_S_INIT, 0);
  393                         return 0;
  394                 }
  395         }
  396         return ENOENT;
  397 }
  398 
  399 static int
  400 mesh_select_proto_metric(struct ieee80211vap *vap, const char *name)
  401 {
  402         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  403         int i;
  404 
  405         for (i = 0; i < N(mesh_proto_metrics); i++) {
  406                 if (strcasecmp(mesh_proto_metrics[i].mpm_descr, name) == 0) {
  407                         ms->ms_pmetric = &mesh_proto_metrics[i];
  408                         if (vap->iv_state == IEEE80211_S_RUN)
  409                                 vap->iv_newstate(vap, IEEE80211_S_INIT, 0);
  410                         return 0;
  411                 }
  412         }
  413         return ENOENT;
  414 }
  415 #undef  N
  416 
  417 static void
  418 ieee80211_mesh_init(void)
  419 {
  420 
  421         memset(mesh_proto_paths, 0, sizeof(mesh_proto_paths));
  422         memset(mesh_proto_metrics, 0, sizeof(mesh_proto_metrics));
  423 
  424         /*
  425          * Setup mesh parameters that depends on the clock frequency.
  426          */
  427         ieee80211_mesh_retrytimeout = msecs_to_ticks(40);
  428         ieee80211_mesh_holdingtimeout = msecs_to_ticks(40);
  429         ieee80211_mesh_confirmtimeout = msecs_to_ticks(40);
  430 
  431         /*
  432          * Register action frame handlers.
  433          */
  434         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  435             IEEE80211_ACTION_MESHPEERING_OPEN,
  436             mesh_recv_action_meshpeering_open);
  437         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  438             IEEE80211_ACTION_MESHPEERING_CONFIRM,
  439             mesh_recv_action_meshpeering_confirm);
  440         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPEERING,
  441             IEEE80211_ACTION_MESHPEERING_CLOSE,
  442             mesh_recv_action_meshpeering_close);
  443         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC,
  444             IEEE80211_ACTION_MESHLMETRIC_REQ, mesh_recv_action_meshlmetric_req);
  445         ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC,
  446             IEEE80211_ACTION_MESHLMETRIC_REP, mesh_recv_action_meshlmetric_rep);
  447 
  448         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  449             IEEE80211_ACTION_MESHPEERING_OPEN,
  450             mesh_send_action_meshpeering_open);
  451         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  452             IEEE80211_ACTION_MESHPEERING_CONFIRM,
  453             mesh_send_action_meshpeering_confirm);
  454         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHPEERING, 
  455             IEEE80211_ACTION_MESHPEERING_CLOSE,
  456             mesh_send_action_meshpeering_close);
  457         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC, 
  458             IEEE80211_ACTION_MESHLMETRIC_REQ,
  459             mesh_send_action_meshlink_request);
  460         ieee80211_send_action_register(IEEE80211_ACTION_CAT_MESHLMETRIC, 
  461             IEEE80211_ACTION_MESHLMETRIC_REP,
  462             mesh_send_action_meshlink_reply);
  463 
  464         /*
  465          * Register Airtime Link Metric.
  466          */
  467         ieee80211_mesh_register_proto_metric(&mesh_metric_airtime);
  468 
  469 }
  470 SYSINIT(wlan_mesh, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_mesh_init, NULL);
  471 
  472 void
  473 ieee80211_mesh_attach(struct ieee80211com *ic)
  474 {
  475         ic->ic_vattach[IEEE80211_M_MBSS] = mesh_vattach;
  476 }
  477 
  478 void
  479 ieee80211_mesh_detach(struct ieee80211com *ic)
  480 {
  481 }
  482 
  483 static void
  484 mesh_vdetach_peers(void *arg, struct ieee80211_node *ni)
  485 {
  486         struct ieee80211com *ic = ni->ni_ic;
  487         uint16_t args[3];
  488 
  489         if (ni->ni_mlstate == IEEE80211_NODE_MESH_ESTABLISHED) {
  490                 args[0] = ni->ni_mlpid;
  491                 args[1] = ni->ni_mllid;
  492                 args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
  493                 ieee80211_send_action(ni,
  494                     IEEE80211_ACTION_CAT_MESHPEERING,
  495                     IEEE80211_ACTION_MESHPEERING_CLOSE,
  496                     args);
  497         }
  498         callout_drain(&ni->ni_mltimer);
  499         /* XXX belongs in hwmp */
  500         ieee80211_ageq_drain_node(&ic->ic_stageq,
  501            (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
  502 }
  503 
  504 static void
  505 mesh_vdetach(struct ieee80211vap *vap)
  506 {
  507         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  508 
  509         callout_drain(&ms->ms_cleantimer);
  510         ieee80211_iterate_nodes(&vap->iv_ic->ic_sta, mesh_vdetach_peers,
  511             NULL);
  512         ieee80211_mesh_rt_flush(vap);
  513         mtx_destroy(&ms->ms_rt_lock);
  514         ms->ms_ppath->mpp_vdetach(vap);
  515         free(vap->iv_mesh, M_80211_VAP);
  516         vap->iv_mesh = NULL;
  517 }
  518 
  519 static void
  520 mesh_vattach(struct ieee80211vap *vap)
  521 {
  522         struct ieee80211_mesh_state *ms;
  523         vap->iv_newstate = mesh_newstate;
  524         vap->iv_input = mesh_input;
  525         vap->iv_opdetach = mesh_vdetach;
  526         vap->iv_recv_mgmt = mesh_recv_mgmt;
  527         ms = malloc(sizeof(struct ieee80211_mesh_state), M_80211_VAP,
  528             M_NOWAIT | M_ZERO);
  529         if (ms == NULL) {
  530                 printf("%s: couldn't alloc MBSS state\n", __func__);
  531                 return;
  532         }
  533         vap->iv_mesh = ms;
  534         ms->ms_seq = 0;
  535         ms->ms_flags = (IEEE80211_MESHFLAGS_AP | IEEE80211_MESHFLAGS_FWD);
  536         ms->ms_ttl = IEEE80211_MESH_DEFAULT_TTL;
  537         TAILQ_INIT(&ms->ms_routes);
  538         mtx_init(&ms->ms_rt_lock, "MBSS", "802.11s routing table", MTX_DEF);
  539         callout_init(&ms->ms_cleantimer, CALLOUT_MPSAFE);
  540         mesh_select_proto_metric(vap, "AIRTIME");
  541         KASSERT(ms->ms_pmetric, ("ms_pmetric == NULL"));
  542         mesh_select_proto_path(vap, "HWMP");
  543         KASSERT(ms->ms_ppath, ("ms_ppath == NULL"));
  544         ms->ms_ppath->mpp_vattach(vap);
  545 }
  546 
  547 /*
  548  * IEEE80211_M_MBSS vap state machine handler.
  549  */
  550 static int
  551 mesh_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  552 {
  553         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  554         struct ieee80211com *ic = vap->iv_ic;
  555         struct ieee80211_node *ni;
  556         enum ieee80211_state ostate;
  557 
  558         IEEE80211_LOCK_ASSERT(ic);
  559 
  560         ostate = vap->iv_state;
  561         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  562             __func__, ieee80211_state_name[ostate],
  563             ieee80211_state_name[nstate], arg);
  564         vap->iv_state = nstate;         /* state transition */
  565         if (ostate != IEEE80211_S_SCAN)
  566                 ieee80211_cancel_scan(vap);     /* background scan */
  567         ni = vap->iv_bss;                       /* NB: no reference held */
  568         if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
  569                 callout_drain(&ms->ms_cleantimer);
  570         switch (nstate) {
  571         case IEEE80211_S_INIT:
  572                 switch (ostate) {
  573                 case IEEE80211_S_SCAN:
  574                         ieee80211_cancel_scan(vap);
  575                         break;
  576                 case IEEE80211_S_CAC:
  577                         ieee80211_dfs_cac_stop(vap);
  578                         break;
  579                 case IEEE80211_S_RUN:
  580                         ieee80211_iterate_nodes(&ic->ic_sta,
  581                             mesh_vdetach_peers, NULL);
  582                         break;
  583                 default:
  584                         break;
  585                 }
  586                 if (ostate != IEEE80211_S_INIT) {
  587                         /* NB: optimize INIT -> INIT case */
  588                         ieee80211_reset_bss(vap);
  589                         ieee80211_mesh_rt_flush(vap);
  590                 }
  591                 break;
  592         case IEEE80211_S_SCAN:
  593                 switch (ostate) {
  594                 case IEEE80211_S_INIT:
  595                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
  596                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan) &&
  597                             ms->ms_idlen != 0) {
  598                                 /*
  599                                  * Already have a channel and a mesh ID; bypass
  600                                  * the scan and startup immediately.
  601                                  */
  602                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
  603                                 break;
  604                         }
  605                         /*
  606                          * Initiate a scan.  We can come here as a result
  607                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  608                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  609                          * and the scan request parameters will be present
  610                          * in iv_scanreq.  Otherwise we do the default.
  611                         */
  612                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  613                                 ieee80211_check_scan(vap,
  614                                     vap->iv_scanreq_flags,
  615                                     vap->iv_scanreq_duration,
  616                                     vap->iv_scanreq_mindwell,
  617                                     vap->iv_scanreq_maxdwell,
  618                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  619                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  620                         } else
  621                                 ieee80211_check_scan_current(vap);
  622                         break;
  623                 default:
  624                         break;
  625                 }
  626                 break;
  627         case IEEE80211_S_CAC:
  628                 /*
  629                  * Start CAC on a DFS channel.  We come here when starting
  630                  * a bss on a DFS channel (see ieee80211_create_ibss).
  631                  */
  632                 ieee80211_dfs_cac_start(vap);
  633                 break;
  634         case IEEE80211_S_RUN:
  635                 switch (ostate) {
  636                 case IEEE80211_S_INIT:
  637                         /*
  638                          * Already have a channel; bypass the
  639                          * scan and startup immediately.
  640                          * Note that ieee80211_create_ibss will call
  641                          * back to do a RUN->RUN state change.
  642                          */
  643                         ieee80211_create_ibss(vap,
  644                             ieee80211_ht_adjust_channel(ic,
  645                                 ic->ic_curchan, vap->iv_flags_ht));
  646                         /* NB: iv_bss is changed on return */
  647                         break;
  648                 case IEEE80211_S_CAC:
  649                         /*
  650                          * NB: This is the normal state change when CAC
  651                          * expires and no radar was detected; no need to
  652                          * clear the CAC timer as it's already expired.
  653                          */
  654                         /* fall thru... */
  655                 case IEEE80211_S_CSA:
  656 #if 0
  657                         /*
  658                          * Shorten inactivity timer of associated stations
  659                          * to weed out sta's that don't follow a CSA.
  660                          */
  661                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
  662 #endif
  663                         /*
  664                          * Update bss node channel to reflect where
  665                          * we landed after CSA.
  666                          */
  667                         ieee80211_node_set_chan(vap->iv_bss,
  668                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
  669                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
  670                         /* XXX bypass debug msgs */
  671                         break;
  672                 case IEEE80211_S_SCAN:
  673                 case IEEE80211_S_RUN:
  674 #ifdef IEEE80211_DEBUG
  675                         if (ieee80211_msg_debug(vap)) {
  676                                 struct ieee80211_node *ni = vap->iv_bss;
  677                                 ieee80211_note(vap,
  678                                     "synchronized with %s meshid ",
  679                                     ether_sprintf(ni->ni_meshid));
  680                                 ieee80211_print_essid(ni->ni_meshid,
  681                                     ni->ni_meshidlen);
  682                                 /* XXX MCS/HT */
  683                                 printf(" channel %d\n",
  684                                     ieee80211_chan2ieee(ic, ic->ic_curchan));
  685                         }
  686 #endif
  687                         break;
  688                 default:
  689                         break;
  690                 }
  691                 ieee80211_node_authorize(vap->iv_bss);
  692                 callout_reset(&ms->ms_cleantimer, ms->ms_ppath->mpp_inact,
  693                     mesh_rt_cleanup_cb, vap);
  694                 break;
  695         default:
  696                 break;
  697         }
  698         /* NB: ostate not nstate */
  699         ms->ms_ppath->mpp_newstate(vap, ostate, arg);
  700         return 0;
  701 }
  702 
  703 static void
  704 mesh_rt_cleanup_cb(void *arg)
  705 {
  706         struct ieee80211vap *vap = arg;
  707         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  708 
  709         mesh_rt_flush_invalid(vap);
  710         callout_reset(&ms->ms_cleantimer, ms->ms_ppath->mpp_inact,
  711             mesh_rt_cleanup_cb, vap);
  712 }
  713 
  714 
  715 /*
  716  * Helper function to note the Mesh Peer Link FSM change.
  717  */
  718 static void
  719 mesh_linkchange(struct ieee80211_node *ni, enum ieee80211_mesh_mlstate state)
  720 {
  721         struct ieee80211vap *vap = ni->ni_vap;
  722         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  723 #ifdef IEEE80211_DEBUG
  724         static const char *meshlinkstates[] = {
  725                 [IEEE80211_NODE_MESH_IDLE]              = "IDLE",
  726                 [IEEE80211_NODE_MESH_OPENSNT]           = "OPEN SENT",
  727                 [IEEE80211_NODE_MESH_OPENRCV]           = "OPEN RECEIVED",
  728                 [IEEE80211_NODE_MESH_CONFIRMRCV]        = "CONFIRM RECEIVED",
  729                 [IEEE80211_NODE_MESH_ESTABLISHED]       = "ESTABLISHED",
  730                 [IEEE80211_NODE_MESH_HOLDING]           = "HOLDING"
  731         };
  732 #endif
  733         IEEE80211_NOTE(vap, IEEE80211_MSG_MESH,
  734             ni, "peer link: %s -> %s",
  735             meshlinkstates[ni->ni_mlstate], meshlinkstates[state]);
  736 
  737         /* track neighbor count */
  738         if (state == IEEE80211_NODE_MESH_ESTABLISHED &&
  739             ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) {
  740                 KASSERT(ms->ms_neighbors < 65535, ("neighbor count overflow"));
  741                 ms->ms_neighbors++;
  742         } else if (ni->ni_mlstate == IEEE80211_NODE_MESH_ESTABLISHED &&
  743             state != IEEE80211_NODE_MESH_ESTABLISHED) {
  744                 KASSERT(ms->ms_neighbors > 0, ("neighbor count 0"));
  745                 ms->ms_neighbors--;
  746         }
  747         ni->ni_mlstate = state;
  748         switch (state) {
  749         case IEEE80211_NODE_MESH_HOLDING:
  750                 ms->ms_ppath->mpp_peerdown(ni);
  751                 break;
  752         case IEEE80211_NODE_MESH_ESTABLISHED:
  753                 ieee80211_mesh_discover(vap, ni->ni_macaddr, NULL);
  754                 break;
  755         default:
  756                 break;
  757         }
  758 }
  759 
  760 /*
  761  * Helper function to generate a unique local ID required for mesh
  762  * peer establishment.
  763  */
  764 static void
  765 mesh_checkid(void *arg, struct ieee80211_node *ni)
  766 {
  767         uint16_t *r = arg;
  768         
  769         if (*r == ni->ni_mllid)
  770                 *(uint16_t *)arg = 0;
  771 }
  772 
  773 static uint32_t
  774 mesh_generateid(struct ieee80211vap *vap)
  775 {
  776         int maxiter = 4;
  777         uint16_t r;
  778 
  779         do {
  780                 get_random_bytes(&r, 2);
  781                 ieee80211_iterate_nodes(&vap->iv_ic->ic_sta, mesh_checkid, &r);
  782                 maxiter--;
  783         } while (r == 0 && maxiter > 0);
  784         return r;
  785 }
  786 
  787 /*
  788  * Verifies if we already received this packet by checking its
  789  * sequence number.
  790  * Returns 0 if the frame is to be accepted, 1 otherwise.
  791  */
  792 static int
  793 mesh_checkpseq(struct ieee80211vap *vap,
  794     const uint8_t source[IEEE80211_ADDR_LEN], uint32_t seq)
  795 {
  796         struct ieee80211_mesh_route *rt;
  797 
  798         rt = ieee80211_mesh_rt_find(vap, source);
  799         if (rt == NULL) {
  800                 rt = ieee80211_mesh_rt_add(vap, source);
  801                 if (rt == NULL) {
  802                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, source,
  803                             "%s", "add mcast route failed");
  804                         vap->iv_stats.is_mesh_rtaddfailed++;
  805                         return 1;
  806                 }
  807                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, source,
  808                     "add mcast route, mesh seqno %d", seq);
  809                 rt->rt_lastmseq = seq;
  810                 return 0;
  811         }
  812         if (IEEE80211_MESH_SEQ_GEQ(rt->rt_lastmseq, seq)) {
  813                 return 1;
  814         } else {
  815                 rt->rt_lastmseq = seq;
  816                 return 0;
  817         }
  818 }
  819 
  820 /*
  821  * Iterate the routing table and locate the next hop.
  822  */
  823 static struct ieee80211_node *
  824 mesh_find_txnode(struct ieee80211vap *vap,
  825     const uint8_t dest[IEEE80211_ADDR_LEN])
  826 {
  827         struct ieee80211_mesh_route *rt;
  828 
  829         rt = ieee80211_mesh_rt_find(vap, dest);
  830         if (rt == NULL)
  831                 return NULL;
  832         if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
  833             (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
  834                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_MESH, dest,
  835                     "%s: !valid or proxy, flags 0x%x", __func__, rt->rt_flags);
  836                 /* XXX stat */
  837                 return NULL;
  838         }
  839         return ieee80211_find_txnode(vap, rt->rt_nexthop);
  840 }
  841 
  842 /*
  843  * Forward the specified frame.
  844  * Decrement the TTL and set TA to our MAC address.
  845  */
  846 static void
  847 mesh_forward(struct ieee80211vap *vap, struct mbuf *m,
  848     const struct ieee80211_meshcntl *mc)
  849 {
  850         struct ieee80211com *ic = vap->iv_ic;
  851         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  852         struct ifnet *ifp = vap->iv_ifp;
  853         struct ifnet *parent = ic->ic_ifp;
  854         const struct ieee80211_frame *wh =
  855             mtod(m, const struct ieee80211_frame *);
  856         struct mbuf *mcopy;
  857         struct ieee80211_meshcntl *mccopy;
  858         struct ieee80211_frame *whcopy;
  859         struct ieee80211_node *ni;
  860         int err;
  861 
  862         if (mc->mc_ttl == 0) {
  863                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  864                     "%s", "frame not fwd'd, ttl 0");
  865                 vap->iv_stats.is_mesh_fwd_ttl++;
  866                 return;
  867         }
  868         if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
  869                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  870                     "%s", "frame not fwd'd, fwding disabled");
  871                 vap->iv_stats.is_mesh_fwd_disabled++;
  872                 return;
  873         }
  874         mcopy = m_dup(m, M_DONTWAIT);
  875         if (mcopy == NULL) {
  876                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  877                     "%s", "frame not fwd'd, cannot dup");
  878                 vap->iv_stats.is_mesh_fwd_nobuf++;
  879                 ifp->if_oerrors++;
  880                 return;
  881         }
  882         mcopy = m_pullup(mcopy, ieee80211_hdrspace(ic, wh) +
  883             sizeof(struct ieee80211_meshcntl));
  884         if (mcopy == NULL) {
  885                 IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  886                     "%s", "frame not fwd'd, too short");
  887                 vap->iv_stats.is_mesh_fwd_tooshort++;
  888                 ifp->if_oerrors++;
  889                 m_freem(mcopy);
  890                 return;
  891         }
  892         whcopy = mtod(mcopy, struct ieee80211_frame *);
  893         mccopy = (struct ieee80211_meshcntl *)
  894             (mtod(mcopy, uint8_t *) + ieee80211_hdrspace(ic, wh));
  895         /* XXX clear other bits? */
  896         whcopy->i_fc[1] &= ~IEEE80211_FC1_RETRY;
  897         IEEE80211_ADDR_COPY(whcopy->i_addr2, vap->iv_myaddr);
  898         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  899                 ni = ieee80211_ref_node(vap->iv_bss);
  900                 mcopy->m_flags |= M_MCAST;
  901         } else {
  902                 ni = mesh_find_txnode(vap, whcopy->i_addr3);
  903                 if (ni == NULL) {
  904                         IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_MESH, wh,
  905                             "%s", "frame not fwd'd, no path");
  906                         vap->iv_stats.is_mesh_fwd_nopath++;
  907                         m_freem(mcopy);
  908                         return;
  909                 }
  910                 IEEE80211_ADDR_COPY(whcopy->i_addr1, ni->ni_macaddr);
  911         }
  912         KASSERT(mccopy->mc_ttl > 0, ("%s called with wrong ttl", __func__));
  913         mccopy->mc_ttl--;
  914 
  915         /* XXX calculate priority so drivers can find the tx queue */
  916         M_WME_SETAC(mcopy, WME_AC_BE);
  917 
  918         /* XXX do we know m_nextpkt is NULL? */
  919         mcopy->m_pkthdr.rcvif = (void *) ni;
  920         err = parent->if_transmit(parent, mcopy);
  921         if (err != 0) {
  922                 /* NB: IFQ_HANDOFF reclaims mbuf */
  923                 ieee80211_free_node(ni);
  924         } else {
  925                 ifp->if_opackets++;
  926         }
  927 }
  928 
  929 static struct mbuf *
  930 mesh_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen, int meshdrlen)
  931 {
  932 #define WHDIR(wh) ((wh)->i_fc[1] & IEEE80211_FC1_DIR_MASK)
  933         uint8_t b[sizeof(struct ieee80211_qosframe_addr4) +
  934                   sizeof(struct ieee80211_meshcntl_ae11)];
  935         const struct ieee80211_qosframe_addr4 *wh;
  936         const struct ieee80211_meshcntl_ae10 *mc;
  937         struct ether_header *eh;
  938         struct llc *llc;
  939         int ae;
  940 
  941         if (m->m_len < hdrlen + sizeof(*llc) &&
  942             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
  943                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
  944                     "discard data frame: %s", "m_pullup failed");
  945                 vap->iv_stats.is_rx_tooshort++;
  946                 return NULL;
  947         }
  948         memcpy(b, mtod(m, caddr_t), hdrlen);
  949         wh = (const struct ieee80211_qosframe_addr4 *)&b[0];
  950         mc = (const struct ieee80211_meshcntl_ae10 *)&b[hdrlen - meshdrlen];
  951         KASSERT(WHDIR(wh) == IEEE80211_FC1_DIR_FROMDS ||
  952                 WHDIR(wh) == IEEE80211_FC1_DIR_DSTODS,
  953             ("bogus dir, fc 0x%x:0x%x", wh->i_fc[0], wh->i_fc[1]));
  954 
  955         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
  956         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
  957             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
  958             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
  959             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
  960             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
  961               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
  962                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
  963                 llc = NULL;
  964         } else {
  965                 m_adj(m, hdrlen - sizeof(*eh));
  966         }
  967         eh = mtod(m, struct ether_header *);
  968         ae = mc->mc_flags & 3;
  969         if (WHDIR(wh) == IEEE80211_FC1_DIR_FROMDS) {
  970                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh->i_addr1);
  971                 if (ae == 0) {
  972                         IEEE80211_ADDR_COPY(eh->ether_shost, wh->i_addr3);
  973                 } else if (ae == 1) {
  974                         IEEE80211_ADDR_COPY(eh->ether_shost, mc->mc_addr4);
  975                 } else {
  976                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  977                             (const struct ieee80211_frame *)wh, NULL,
  978                             "bad AE %d", ae);
  979                         vap->iv_stats.is_mesh_badae++;
  980                         m_freem(m);
  981                         return NULL;
  982                 }
  983         } else {
  984                 if (ae == 0) {
  985                         IEEE80211_ADDR_COPY(eh->ether_dhost, wh->i_addr3);
  986                         IEEE80211_ADDR_COPY(eh->ether_shost, wh->i_addr4);
  987                 } else if (ae == 2) {
  988                         IEEE80211_ADDR_COPY(eh->ether_dhost, mc->mc_addr4);
  989                         IEEE80211_ADDR_COPY(eh->ether_shost, mc->mc_addr5);
  990                 } else {
  991                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  992                             (const struct ieee80211_frame *)wh, NULL,
  993                             "bad AE %d", ae);
  994                         vap->iv_stats.is_mesh_badae++;
  995                         m_freem(m);
  996                         return NULL;
  997                 }
  998         }
  999 #ifdef ALIGNED_POINTER
 1000         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
 1001                 m = ieee80211_realign(vap, m, sizeof(*eh));
 1002                 if (m == NULL)
 1003                         return NULL;
 1004         }
 1005 #endif /* ALIGNED_POINTER */
 1006         if (llc != NULL) {
 1007                 eh = mtod(m, struct ether_header *);
 1008                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
 1009         }
 1010         return m;
 1011 #undef WDIR
 1012 }
 1013 
 1014 /*
 1015  * Return non-zero if the unicast mesh data frame should be processed
 1016  * locally.  Frames that are not proxy'd have our address, otherwise
 1017  * we need to consult the routing table to look for a proxy entry.
 1018  */
 1019 static __inline int
 1020 mesh_isucastforme(struct ieee80211vap *vap, const struct ieee80211_frame *wh,
 1021     const struct ieee80211_meshcntl *mc)
 1022 {
 1023         int ae = mc->mc_flags & 3;
 1024 
 1025         KASSERT((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS,
 1026             ("bad dir 0x%x:0x%x", wh->i_fc[0], wh->i_fc[1]));
 1027         KASSERT(ae == 0 || ae == 2, ("bad AE %d", ae));
 1028         if (ae == 2) {                          /* ucast w/ proxy */
 1029                 const struct ieee80211_meshcntl_ae10 *mc10 =
 1030                     (const struct ieee80211_meshcntl_ae10 *) mc;
 1031                 struct ieee80211_mesh_route *rt =
 1032                     ieee80211_mesh_rt_find(vap, mc10->mc_addr4);
 1033                 /* check for proxy route to ourself */
 1034                 return (rt != NULL &&
 1035                     (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY));
 1036         } else                                  /* ucast w/o proxy */
 1037                 return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
 1038 }
 1039 
 1040 static int
 1041 mesh_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 1042 {
 1043 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 1044 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 1045         struct ieee80211vap *vap = ni->ni_vap;
 1046         struct ieee80211com *ic = ni->ni_ic;
 1047         struct ifnet *ifp = vap->iv_ifp;
 1048         struct ieee80211_frame *wh;
 1049         const struct ieee80211_meshcntl *mc;
 1050         int hdrspace, meshdrlen, need_tap;
 1051         uint8_t dir, type, subtype, qos;
 1052         uint32_t seq;
 1053         uint8_t *addr;
 1054         ieee80211_seq rxseq;
 1055 
 1056         KASSERT(ni != NULL, ("null node"));
 1057         ni->ni_inact = ni->ni_inact_reload;
 1058 
 1059         need_tap = 1;                   /* mbuf need to be tapped. */
 1060         type = -1;                      /* undefined */
 1061 
 1062         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 1063                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1064                     ni->ni_macaddr, NULL,
 1065                     "too short (1): len %u", m->m_pkthdr.len);
 1066                 vap->iv_stats.is_rx_tooshort++;
 1067                 goto out;
 1068         }
 1069         /*
 1070          * Bit of a cheat here, we use a pointer for a 3-address
 1071          * frame format but don't reference fields past outside
 1072          * ieee80211_frame_min w/o first validating the data is
 1073          * present.
 1074         */
 1075         wh = mtod(m, struct ieee80211_frame *);
 1076 
 1077         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 1078             IEEE80211_FC0_VERSION_0) {
 1079                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1080                     ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
 1081                 vap->iv_stats.is_rx_badversion++;
 1082                 goto err;
 1083         }
 1084         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 1085         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 1086         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 1087         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 1088                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 1089                 ni->ni_noise = nf;
 1090                 if (HAS_SEQ(type)) {
 1091                         uint8_t tid = ieee80211_gettid(wh);
 1092 
 1093                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 1094                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 1095                                 ic->ic_wme.wme_hipri_traffic++;
 1096                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 1097                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 1098                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 1099                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 1100                                 /* duplicate, discard */
 1101                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1102                                     wh->i_addr1, "duplicate",
 1103                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 1104                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 1105                                     ni->ni_rxseqs[tid] >>
 1106                                     IEEE80211_SEQ_SEQ_SHIFT,
 1107                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 1108                                     ni->ni_rxseqs[tid] &
 1109                                     IEEE80211_SEQ_FRAG_MASK,
 1110                                     tid);
 1111                                 vap->iv_stats.is_rx_dup++;
 1112                                 IEEE80211_NODE_STAT(ni, rx_dup);
 1113                                 goto out;
 1114                         }
 1115                         ni->ni_rxseqs[tid] = rxseq;
 1116                 }
 1117         }
 1118 #ifdef IEEE80211_DEBUG
 1119         /*
 1120          * It's easier, but too expensive, to simulate different mesh
 1121          * topologies by consulting the ACL policy very early, so do this
 1122          * only under DEBUG.
 1123          *
 1124          * NB: this check is also done upon peering link initiation.
 1125          */
 1126         if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
 1127                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
 1128                     wh, NULL, "%s", "disallowed by ACL");
 1129                 vap->iv_stats.is_rx_acl++;
 1130                 goto out;
 1131         }
 1132 #endif
 1133         switch (type) {
 1134         case IEEE80211_FC0_TYPE_DATA:
 1135                 if (ni == vap->iv_bss)
 1136                         goto out;
 1137                 if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED) {
 1138                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_MESH,
 1139                             ni->ni_macaddr, NULL,
 1140                             "peer link not yet established (%d)",
 1141                             ni->ni_mlstate);
 1142                         vap->iv_stats.is_mesh_nolink++;
 1143                         goto out;
 1144                 }       
 1145                 if (dir != IEEE80211_FC1_DIR_FROMDS &&
 1146                     dir != IEEE80211_FC1_DIR_DSTODS) {
 1147                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1148                             wh, "data", "incorrect dir 0x%x", dir);
 1149                         vap->iv_stats.is_rx_wrongdir++;
 1150                         goto err;
 1151                 }
 1152                 /* pull up enough to get to the mesh control */
 1153                 hdrspace = ieee80211_hdrspace(ic, wh);
 1154                 if (m->m_len < hdrspace + sizeof(struct ieee80211_meshcntl) &&
 1155                     (m = m_pullup(m, hdrspace +
 1156                         sizeof(struct ieee80211_meshcntl))) == NULL) {
 1157                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1158                             ni->ni_macaddr, NULL,
 1159                             "data too short: expecting %u", hdrspace);
 1160                         vap->iv_stats.is_rx_tooshort++;
 1161                         goto out;               /* XXX */
 1162                 }
 1163                 /*
 1164                  * Now calculate the full extent of the headers. Note
 1165                  * mesh_decap will pull up anything we didn't get
 1166                  * above when it strips the 802.11 headers.
 1167                  */
 1168                 mc = (const struct ieee80211_meshcntl *)
 1169                     (mtod(m, const uint8_t *) + hdrspace);
 1170                 meshdrlen = sizeof(struct ieee80211_meshcntl) +
 1171                     (mc->mc_flags & 3) * IEEE80211_ADDR_LEN;
 1172                 hdrspace += meshdrlen;
 1173                 seq = LE_READ_4(mc->mc_seq);
 1174                 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
 1175                         addr = wh->i_addr3;
 1176                 else
 1177                         addr = ((struct ieee80211_qosframe_addr4 *)wh)->i_addr4;
 1178                 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, addr)) {
 1179                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1180                             addr, "data", "%s", "not to me");
 1181                         vap->iv_stats.is_rx_wrongbss++; /* XXX kinda */
 1182                         goto out;
 1183                 }
 1184                 if (mesh_checkpseq(vap, addr, seq) != 0) {
 1185                         vap->iv_stats.is_rx_dup++;
 1186                         goto out;
 1187                 }
 1188 
 1189                 /*
 1190                  * Potentially forward packet.  See table s36 (p140)
 1191                  * for the rules.  XXX tap fwd'd packets not for us?
 1192                  */
 1193                 if (dir == IEEE80211_FC1_DIR_FROMDS ||
 1194                     !mesh_isucastforme(vap, wh, mc)) {
 1195                         mesh_forward(vap, m, mc);
 1196                         if (dir == IEEE80211_FC1_DIR_DSTODS)
 1197                                 goto out;
 1198                         /* NB: fall thru to deliver mcast frames locally */
 1199                 }
 1200 
 1201                 /*
 1202                  * Save QoS bits for use below--before we strip the header.
 1203                  */
 1204                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 1205                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 1206                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 1207                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 1208                 } else
 1209                         qos = 0;
 1210                 /*
 1211                  * Next up, any fragmentation.
 1212                  */
 1213                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1214                         m = ieee80211_defrag(ni, m, hdrspace);
 1215                         if (m == NULL) {
 1216                                 /* Fragment dropped or frame not complete yet */
 1217                                 goto out;
 1218                         }
 1219                 }
 1220                 wh = NULL;              /* no longer valid, catch any uses */
 1221 
 1222                 if (ieee80211_radiotap_active_vap(vap))
 1223                         ieee80211_radiotap_rx(vap, m);
 1224                 need_tap = 0;
 1225 
 1226                 /*
 1227                  * Finally, strip the 802.11 header.
 1228                  */
 1229                 m = mesh_decap(vap, m, hdrspace, meshdrlen);
 1230                 if (m == NULL) {
 1231                         /* XXX mask bit to check for both */
 1232                         /* don't count Null data frames as errors */
 1233                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 1234                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 1235                                 goto out;
 1236                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 1237                             ni->ni_macaddr, "data", "%s", "decap error");
 1238                         vap->iv_stats.is_rx_decap++;
 1239                         IEEE80211_NODE_STAT(ni, rx_decap);
 1240                         goto err;
 1241                 }
 1242                 if (qos & IEEE80211_QOS_AMSDU) {
 1243                         m = ieee80211_decap_amsdu(ni, m);
 1244                         if (m == NULL)
 1245                                 return IEEE80211_FC0_TYPE_DATA;
 1246                 }
 1247                 ieee80211_deliver_data(vap, ni, m);
 1248                 return type;
 1249         case IEEE80211_FC0_TYPE_MGT:
 1250                 vap->iv_stats.is_rx_mgmt++;
 1251                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 1252                 if (dir != IEEE80211_FC1_DIR_NODS) {
 1253                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1254                             wh, "mgt", "incorrect dir 0x%x", dir);
 1255                         vap->iv_stats.is_rx_wrongdir++;
 1256                         goto err;
 1257                 }
 1258                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 1259                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 1260                             ni->ni_macaddr, "mgt", "too short: len %u",
 1261                             m->m_pkthdr.len);
 1262                         vap->iv_stats.is_rx_tooshort++;
 1263                         goto out;
 1264                 }
 1265 #ifdef IEEE80211_DEBUG
 1266                 if ((ieee80211_msg_debug(vap) && 
 1267                     (vap->iv_ic->ic_flags & IEEE80211_F_SCAN)) ||
 1268                     ieee80211_msg_dumppkts(vap)) {
 1269                         if_printf(ifp, "received %s from %s rssi %d\n",
 1270                             ieee80211_mgt_subtype_name[subtype >>
 1271                             IEEE80211_FC0_SUBTYPE_SHIFT],
 1272                             ether_sprintf(wh->i_addr2), rssi);
 1273                 }
 1274 #endif
 1275                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 1276                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1277                             wh, NULL, "%s", "WEP set but not permitted");
 1278                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 1279                         goto out;
 1280                 }
 1281                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 1282                 goto out;
 1283         case IEEE80211_FC0_TYPE_CTL:
 1284                 vap->iv_stats.is_rx_ctl++;
 1285                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 1286                 goto out;
 1287         default:
 1288                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1289                     wh, "bad", "frame type 0x%x", type);
 1290                 /* should not come here */
 1291                 break;
 1292         }
 1293 err:
 1294         ifp->if_ierrors++;
 1295 out:
 1296         if (m != NULL) {
 1297                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 1298                         ieee80211_radiotap_rx(vap, m);
 1299                 m_freem(m);
 1300         }
 1301         return type;
 1302 }
 1303 
 1304 static void
 1305 mesh_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
 1306     int rssi, int nf)
 1307 {
 1308         struct ieee80211vap *vap = ni->ni_vap;
 1309         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1310         struct ieee80211com *ic = ni->ni_ic;
 1311         struct ieee80211_frame *wh;
 1312         uint8_t *frm, *efrm;
 1313 
 1314         wh = mtod(m0, struct ieee80211_frame *);
 1315         frm = (uint8_t *)&wh[1];
 1316         efrm = mtod(m0, uint8_t *) + m0->m_len;
 1317         switch (subtype) {
 1318         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 1319         case IEEE80211_FC0_SUBTYPE_BEACON:
 1320         {
 1321                 struct ieee80211_scanparams scan;
 1322                 /*
 1323                  * We process beacon/probe response
 1324                  * frames to discover neighbors.
 1325                  */
 1326                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 1327                         return;
 1328                 /*
 1329                  * Count frame now that we know it's to be processed.
 1330                  */
 1331                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 1332                         vap->iv_stats.is_rx_beacon++;   /* XXX remove */
 1333                         IEEE80211_NODE_STAT(ni, rx_beacons);
 1334                 } else
 1335                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 1336                 /*
 1337                  * If scanning, just pass information to the scan module.
 1338                  */
 1339                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 1340                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 1341                                 /*
 1342                                  * Actively scanning a channel marked passive;
 1343                                  * send a probe request now that we know there
 1344                                  * is 802.11 traffic present.
 1345                                  *
 1346                                  * XXX check if the beacon we recv'd gives
 1347                                  * us what we need and suppress the probe req
 1348                                  */
 1349                                 ieee80211_probe_curchan(vap, 1);
 1350                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 1351                         }
 1352                         ieee80211_add_scan(vap, &scan, wh,
 1353                             subtype, rssi, nf);
 1354                         return;
 1355                 }
 1356 
 1357                 /* The rest of this code assumes we are running */
 1358                 if (vap->iv_state != IEEE80211_S_RUN)
 1359                         return;
 1360                 /*
 1361                  * Ignore non-mesh STAs.
 1362                  */
 1363                 if ((scan.capinfo &
 1364                      (IEEE80211_CAPINFO_ESS|IEEE80211_CAPINFO_IBSS)) ||
 1365                     scan.meshid == NULL || scan.meshconf == NULL) {
 1366                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1367                             wh, "beacon", "%s", "not a mesh sta");
 1368                         vap->iv_stats.is_mesh_wrongmesh++;
 1369                         return;
 1370                 }
 1371                 /*
 1372                  * Ignore STAs for other mesh networks.
 1373                  */
 1374                 if (memcmp(scan.meshid+2, ms->ms_id, ms->ms_idlen) != 0 ||
 1375                     mesh_verify_meshconf(vap, scan.meshconf)) {
 1376                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1377                             wh, "beacon", "%s", "not for our mesh");
 1378                         vap->iv_stats.is_mesh_wrongmesh++;
 1379                         return;
 1380                 }
 1381                 /*
 1382                  * Peer only based on the current ACL policy.
 1383                  */
 1384                 if (vap->iv_acl != NULL &&
 1385                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
 1386                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
 1387                             wh, NULL, "%s", "disallowed by ACL");
 1388                         vap->iv_stats.is_rx_acl++;
 1389                         return;
 1390                 }
 1391                 /*
 1392                  * Do neighbor discovery.
 1393                  */
 1394                 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 1395                         /*
 1396                          * Create a new entry in the neighbor table.
 1397                          */
 1398                         ni = ieee80211_add_neighbor(vap, wh, &scan);
 1399                 }
 1400                 /*
 1401                  * Automatically peer with discovered nodes if possible.
 1402                  * XXX backoff on repeated failure
 1403                  */
 1404                 if (ni != vap->iv_bss &&
 1405                     (ms->ms_flags & IEEE80211_MESHFLAGS_AP) &&
 1406                     ni->ni_mlstate == IEEE80211_NODE_MESH_IDLE) {
 1407                         uint16_t args[1];
 1408 
 1409                         ni->ni_mlpid = mesh_generateid(vap);
 1410                         if (ni->ni_mlpid == 0)
 1411                                 return;
 1412                         mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENSNT);
 1413                         args[0] = ni->ni_mlpid;
 1414                         ieee80211_send_action(ni,
 1415                             IEEE80211_ACTION_CAT_MESHPEERING,
 1416                             IEEE80211_ACTION_MESHPEERING_OPEN, args);
 1417                         ni->ni_mlrcnt = 0;
 1418                         mesh_peer_timeout_setup(ni);
 1419                 }
 1420                 break;
 1421         }
 1422         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 1423         {
 1424                 uint8_t *ssid, *meshid, *rates, *xrates;
 1425                 uint8_t *sfrm;
 1426 
 1427                 if (vap->iv_state != IEEE80211_S_RUN) {
 1428                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1429                             wh, NULL, "wrong state %s",
 1430                             ieee80211_state_name[vap->iv_state]);
 1431                         vap->iv_stats.is_rx_mgtdiscard++;
 1432                         return;
 1433                 }
 1434                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 1435                         /* frame must be directed */
 1436                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1437                             wh, NULL, "%s", "not unicast");
 1438                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 1439                         return;
 1440                 }
 1441                 /*
 1442                  * prreq frame format
 1443                  *      [tlv] ssid
 1444                  *      [tlv] supported rates
 1445                  *      [tlv] extended supported rates
 1446                  *      [tlv] mesh id
 1447                  */
 1448                 ssid = meshid = rates = xrates = NULL;
 1449                 sfrm = frm;
 1450                 while (efrm - frm > 1) {
 1451                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1452                         switch (*frm) {
 1453                         case IEEE80211_ELEMID_SSID:
 1454                                 ssid = frm;
 1455                                 break;
 1456                         case IEEE80211_ELEMID_RATES:
 1457                                 rates = frm;
 1458                                 break;
 1459                         case IEEE80211_ELEMID_XRATES:
 1460                                 xrates = frm;
 1461                                 break;
 1462                         case IEEE80211_ELEMID_MESHID:
 1463                                 meshid = frm;
 1464                                 break;
 1465                         }
 1466                         frm += frm[2] + 2;
 1467                 }
 1468                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 1469                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 1470                 if (xrates != NULL)
 1471                         IEEE80211_VERIFY_ELEMENT(xrates,
 1472                             IEEE80211_RATE_MAXSIZE - rates[1], return);
 1473                 if (meshid != NULL)
 1474                         IEEE80211_VERIFY_ELEMENT(meshid,
 1475                             IEEE80211_MESHID_LEN, return);
 1476                 /* NB: meshid, not ssid */
 1477                 IEEE80211_VERIFY_SSID(vap->iv_bss, meshid, return);
 1478 
 1479                 /* XXX find a better class or define it's own */
 1480                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 1481                     "%s", "recv probe req");
 1482                 /*
 1483                  * Some legacy 11b clients cannot hack a complete
 1484                  * probe response frame.  When the request includes
 1485                  * only a bare-bones rate set, communicate this to
 1486                  * the transmit side.
 1487                  */
 1488                 ieee80211_send_proberesp(vap, wh->i_addr2, 0);
 1489                 break;
 1490         }
 1491         case IEEE80211_FC0_SUBTYPE_ACTION:
 1492                 if (vap->iv_state != IEEE80211_S_RUN) {
 1493                         vap->iv_stats.is_rx_mgtdiscard++;
 1494                         break;
 1495                 }
 1496                 /*
 1497                  * We received an action for an unknown neighbor.
 1498                  * XXX: wait for it to beacon or create ieee80211_node?
 1499                  */
 1500                 if (ni == vap->iv_bss) {
 1501                         IEEE80211_DISCARD(vap, IEEE80211_MSG_MESH,
 1502                             wh, NULL, "%s", "unknown node");
 1503                         vap->iv_stats.is_rx_mgtdiscard++;
 1504                         break;
 1505                 }
 1506                 /*
 1507                  * Discard if not for us.
 1508                  */
 1509                 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 1510                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1511                         IEEE80211_DISCARD(vap, IEEE80211_MSG_MESH,
 1512                             wh, NULL, "%s", "not for me");
 1513                         vap->iv_stats.is_rx_mgtdiscard++;
 1514                         break;
 1515                 }
 1516                 /* XXX parse_action is a bit useless now */
 1517                 if (ieee80211_parse_action(ni, m0) == 0)
 1518                         ic->ic_recv_action(ni, wh, frm, efrm);
 1519                 break;
 1520         case IEEE80211_FC0_SUBTYPE_AUTH:
 1521         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1522         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 1523         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 1524         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 1525         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 1526         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 1527                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1528                     wh, NULL, "%s", "not handled");
 1529                 vap->iv_stats.is_rx_mgtdiscard++;
 1530                 return;
 1531         default:
 1532                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1533                     wh, "mgt", "subtype 0x%x not handled", subtype);
 1534                 vap->iv_stats.is_rx_badsubtype++;
 1535                 break;
 1536         }
 1537 }
 1538 
 1539 /*
 1540  * Parse meshpeering action ie's for open+confirm frames; the
 1541  * important bits are returned in the supplied structure.
 1542  */
 1543 static const struct ieee80211_meshpeer_ie *
 1544 mesh_parse_meshpeering_action(struct ieee80211_node *ni,
 1545         const struct ieee80211_frame *wh,       /* XXX for VERIFY_LENGTH */
 1546         const uint8_t *frm, const uint8_t *efrm,
 1547         struct ieee80211_meshpeer_ie *mp, uint8_t subtype)
 1548 {
 1549         struct ieee80211vap *vap = ni->ni_vap;
 1550         const struct ieee80211_meshpeer_ie *mpie;
 1551         const uint8_t *meshid, *meshconf, *meshpeer;
 1552 
 1553         meshid = meshconf = meshpeer = NULL;
 1554         while (efrm - frm > 1) {
 1555                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return NULL);
 1556                 switch (*frm) {
 1557                 case IEEE80211_ELEMID_MESHID:
 1558                         meshid = frm;
 1559                         break;
 1560                 case IEEE80211_ELEMID_MESHCONF:
 1561                         meshconf = frm;
 1562                         break;
 1563                 case IEEE80211_ELEMID_MESHPEER:
 1564                         meshpeer = frm;
 1565                         mpie = (const struct ieee80211_meshpeer_ie *) frm;
 1566                         memset(mp, 0, sizeof(*mp));
 1567                         mp->peer_llinkid = LE_READ_2(&mpie->peer_llinkid);
 1568                         /* NB: peer link ID is optional on these frames */
 1569                         if (subtype == IEEE80211_MESH_PEER_LINK_CLOSE &&
 1570                             mpie->peer_len == 8) {
 1571                                 mp->peer_linkid = 0;
 1572                                 mp->peer_rcode = LE_READ_2(&mpie->peer_linkid);
 1573                         } else {
 1574                                 mp->peer_linkid = LE_READ_2(&mpie->peer_linkid);
 1575                                 mp->peer_rcode = LE_READ_2(&mpie->peer_rcode);
 1576                         }
 1577                         break;
 1578                 }
 1579                 frm += frm[1] + 2;
 1580         }
 1581 
 1582         /*
 1583          * Verify the contents of the frame. Action frames with
 1584          * close subtype don't have a Mesh Configuration IE.
 1585          * If if fails validation, close the peer link.
 1586          */
 1587         KASSERT(meshpeer != NULL &&
 1588             subtype != IEEE80211_ACTION_MESHPEERING_CLOSE,
 1589             ("parsing close action"));
 1590 
 1591         if (mesh_verify_meshid(vap, meshid) ||
 1592             mesh_verify_meshpeer(vap, subtype, meshpeer) ||
 1593             mesh_verify_meshconf(vap, meshconf)) {
 1594                 uint16_t args[3];
 1595 
 1596                 IEEE80211_DISCARD(vap,
 1597                     IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1598                     wh, NULL, "%s", "not for our mesh");
 1599                 vap->iv_stats.is_rx_mgtdiscard++;
 1600                 switch (ni->ni_mlstate) {
 1601                 case IEEE80211_NODE_MESH_IDLE:
 1602                 case IEEE80211_NODE_MESH_ESTABLISHED:
 1603                 case IEEE80211_NODE_MESH_HOLDING:
 1604                         /* ignore */
 1605                         break;
 1606                 case IEEE80211_NODE_MESH_OPENSNT:
 1607                 case IEEE80211_NODE_MESH_OPENRCV:
 1608                 case IEEE80211_NODE_MESH_CONFIRMRCV:
 1609                         args[0] = ni->ni_mlpid;
 1610                         args[1] = ni->ni_mllid;
 1611                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1612                         ieee80211_send_action(ni,
 1613                             IEEE80211_ACTION_CAT_MESHPEERING,
 1614                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1615                             args);
 1616                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1617                         mesh_peer_timeout_setup(ni);
 1618                         break;
 1619                 }
 1620                 return NULL;
 1621         }
 1622         return (const struct ieee80211_meshpeer_ie *) mp;
 1623 }
 1624 
 1625 static int
 1626 mesh_recv_action_meshpeering_open(struct ieee80211_node *ni,
 1627         const struct ieee80211_frame *wh,
 1628         const uint8_t *frm, const uint8_t *efrm)
 1629 {
 1630         struct ieee80211vap *vap = ni->ni_vap;
 1631         struct ieee80211_meshpeer_ie ie;
 1632         const struct ieee80211_meshpeer_ie *meshpeer;
 1633         uint16_t args[3];
 1634 
 1635         /* +2+2 for action + code + capabilites */
 1636         meshpeer = mesh_parse_meshpeering_action(ni, wh, frm+2+2, efrm, &ie,
 1637             IEEE80211_ACTION_MESHPEERING_OPEN);
 1638         if (meshpeer == NULL) {
 1639                 return 0;
 1640         }
 1641 
 1642         /* XXX move up */
 1643         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1644             "recv PEER OPEN, lid 0x%x", meshpeer->peer_llinkid);
 1645 
 1646         switch (ni->ni_mlstate) {
 1647         case IEEE80211_NODE_MESH_IDLE:
 1648                 mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENRCV);
 1649                 ni->ni_mllid = meshpeer->peer_llinkid;
 1650                 ni->ni_mlpid = mesh_generateid(vap);
 1651                 if (ni->ni_mlpid == 0)
 1652                         return 0;               /* XXX */
 1653                 args[0] = ni->ni_mlpid;
 1654                 /* Announce we're open too... */
 1655                 ieee80211_send_action(ni,
 1656                     IEEE80211_ACTION_CAT_MESHPEERING,
 1657                     IEEE80211_ACTION_MESHPEERING_OPEN, args);
 1658                 /* ...and confirm the link. */
 1659                 args[0] = ni->ni_mlpid;
 1660                 args[1] = ni->ni_mllid;
 1661                 ieee80211_send_action(ni,
 1662                     IEEE80211_ACTION_CAT_MESHPEERING,
 1663                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1664                     args);
 1665                 mesh_peer_timeout_setup(ni);
 1666                 break;
 1667         case IEEE80211_NODE_MESH_OPENRCV:
 1668                 /* Wrong Link ID */
 1669                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1670                         args[0] = ni->ni_mllid;
 1671                         args[1] = ni->ni_mlpid;
 1672                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1673                         ieee80211_send_action(ni,
 1674                             IEEE80211_ACTION_CAT_MESHPEERING,
 1675                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1676                             args);
 1677                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1678                         mesh_peer_timeout_setup(ni);
 1679                         break;
 1680                 }
 1681                 /* Duplicate open, confirm again. */
 1682                 args[0] = ni->ni_mlpid;
 1683                 args[1] = ni->ni_mllid;
 1684                 ieee80211_send_action(ni,
 1685                     IEEE80211_ACTION_CAT_MESHPEERING,
 1686                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1687                     args);
 1688                 break;
 1689         case IEEE80211_NODE_MESH_OPENSNT:
 1690                 ni->ni_mllid = meshpeer->peer_llinkid;
 1691                 mesh_linkchange(ni, IEEE80211_NODE_MESH_OPENRCV);
 1692                 args[0] = ni->ni_mlpid;
 1693                 args[1] = ni->ni_mllid;
 1694                 ieee80211_send_action(ni,
 1695                     IEEE80211_ACTION_CAT_MESHPEERING,
 1696                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1697                     args);
 1698                 /* NB: don't setup/clear any timeout */
 1699                 break;
 1700         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1701                 if (ni->ni_mlpid != meshpeer->peer_linkid ||
 1702                     ni->ni_mllid != meshpeer->peer_llinkid) {
 1703                         args[0] = ni->ni_mlpid;
 1704                         args[1] = ni->ni_mllid;
 1705                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1706                         ieee80211_send_action(ni,
 1707                             IEEE80211_ACTION_CAT_MESHPEERING,
 1708                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1709                             args);
 1710                         mesh_linkchange(ni,
 1711                             IEEE80211_NODE_MESH_HOLDING);
 1712                         mesh_peer_timeout_setup(ni);
 1713                         break;
 1714                 }
 1715                 mesh_linkchange(ni, IEEE80211_NODE_MESH_ESTABLISHED);
 1716                 ni->ni_mllid = meshpeer->peer_llinkid;
 1717                 args[0] = ni->ni_mlpid;
 1718                 args[1] = ni->ni_mllid;
 1719                 ieee80211_send_action(ni,
 1720                     IEEE80211_ACTION_CAT_MESHPEERING,
 1721                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1722                     args);
 1723                 mesh_peer_timeout_stop(ni);
 1724                 break;
 1725         case IEEE80211_NODE_MESH_ESTABLISHED:
 1726                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1727                         args[0] = ni->ni_mllid;
 1728                         args[1] = ni->ni_mlpid;
 1729                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1730                         ieee80211_send_action(ni,
 1731                             IEEE80211_ACTION_CAT_MESHPEERING,
 1732                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1733                             args);
 1734                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1735                         mesh_peer_timeout_setup(ni);
 1736                         break;
 1737                 }
 1738                 args[0] = ni->ni_mlpid;
 1739                 args[1] = ni->ni_mllid;
 1740                 ieee80211_send_action(ni,
 1741                     IEEE80211_ACTION_CAT_MESHPEERING,
 1742                     IEEE80211_ACTION_MESHPEERING_CONFIRM,
 1743                     args);
 1744                 break;
 1745         case IEEE80211_NODE_MESH_HOLDING:
 1746                 args[0] = ni->ni_mlpid;
 1747                 args[1] = meshpeer->peer_llinkid;
 1748                 args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 1749                 ieee80211_send_action(ni,
 1750                     IEEE80211_ACTION_CAT_MESHPEERING,
 1751                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1752                     args);
 1753                 break;
 1754         }
 1755         return 0;
 1756 }
 1757 
 1758 static int
 1759 mesh_recv_action_meshpeering_confirm(struct ieee80211_node *ni,
 1760         const struct ieee80211_frame *wh,
 1761         const uint8_t *frm, const uint8_t *efrm)
 1762 {
 1763         struct ieee80211vap *vap = ni->ni_vap;
 1764         struct ieee80211_meshpeer_ie ie;
 1765         const struct ieee80211_meshpeer_ie *meshpeer;
 1766         uint16_t args[3];
 1767 
 1768         /* +2+2+2+2 for action + code + capabilites + status code + AID */
 1769         meshpeer = mesh_parse_meshpeering_action(ni, wh, frm+2+2+2+2, efrm, &ie,
 1770             IEEE80211_ACTION_MESHPEERING_CONFIRM);
 1771         if (meshpeer == NULL) {
 1772                 return 0;
 1773         }
 1774 
 1775         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1776             "recv PEER CONFIRM, local id 0x%x, peer id 0x%x",
 1777             meshpeer->peer_llinkid, meshpeer->peer_linkid);
 1778 
 1779         switch (ni->ni_mlstate) {
 1780         case IEEE80211_NODE_MESH_OPENRCV:
 1781                 mesh_linkchange(ni, IEEE80211_NODE_MESH_ESTABLISHED);
 1782                 mesh_peer_timeout_stop(ni);
 1783                 break;
 1784         case IEEE80211_NODE_MESH_OPENSNT:
 1785                 mesh_linkchange(ni, IEEE80211_NODE_MESH_CONFIRMRCV);
 1786                 break;
 1787         case IEEE80211_NODE_MESH_HOLDING:
 1788                 args[0] = ni->ni_mlpid;
 1789                 args[1] = meshpeer->peer_llinkid;
 1790                 args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 1791                 ieee80211_send_action(ni,
 1792                     IEEE80211_ACTION_CAT_MESHPEERING,
 1793                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1794                     args);
 1795                 break;
 1796         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1797                 if (ni->ni_mllid != meshpeer->peer_llinkid) {
 1798                         args[0] = ni->ni_mlpid;
 1799                         args[1] = ni->ni_mllid;
 1800                         args[2] = IEEE80211_REASON_PEER_LINK_CANCELED;
 1801                         ieee80211_send_action(ni,
 1802                             IEEE80211_ACTION_CAT_MESHPEERING,
 1803                             IEEE80211_ACTION_MESHPEERING_CLOSE,
 1804                             args);
 1805                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1806                         mesh_peer_timeout_setup(ni);
 1807                 }
 1808                 break;
 1809         default:
 1810                 IEEE80211_DISCARD(vap,
 1811                     IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1812                     wh, NULL, "received confirm in invalid state %d",
 1813                     ni->ni_mlstate);
 1814                 vap->iv_stats.is_rx_mgtdiscard++;
 1815                 break;
 1816         }
 1817         return 0;
 1818 }
 1819 
 1820 static int
 1821 mesh_recv_action_meshpeering_close(struct ieee80211_node *ni,
 1822         const struct ieee80211_frame *wh,
 1823         const uint8_t *frm, const uint8_t *efrm)
 1824 {
 1825         uint16_t args[3];
 1826 
 1827         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH,
 1828             ni, "%s", "recv PEER CLOSE");
 1829 
 1830         switch (ni->ni_mlstate) {
 1831         case IEEE80211_NODE_MESH_IDLE:
 1832                 /* ignore */
 1833                 break;
 1834         case IEEE80211_NODE_MESH_OPENRCV:
 1835         case IEEE80211_NODE_MESH_OPENSNT:
 1836         case IEEE80211_NODE_MESH_CONFIRMRCV:
 1837         case IEEE80211_NODE_MESH_ESTABLISHED:
 1838                 args[0] = ni->ni_mlpid;
 1839                 args[1] = ni->ni_mllid;
 1840                 args[2] = IEEE80211_REASON_MESH_CLOSE_RCVD;
 1841                 ieee80211_send_action(ni,
 1842                     IEEE80211_ACTION_CAT_MESHPEERING,
 1843                     IEEE80211_ACTION_MESHPEERING_CLOSE,
 1844                     args);
 1845                 mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 1846                 mesh_peer_timeout_setup(ni);
 1847                 break;
 1848         case IEEE80211_NODE_MESH_HOLDING:
 1849                 mesh_linkchange(ni, IEEE80211_NODE_MESH_IDLE);
 1850                 mesh_peer_timeout_setup(ni);
 1851                 break;
 1852         }
 1853         return 0;
 1854 }
 1855 
 1856 /*
 1857  * Link Metric handling.
 1858  */
 1859 static int
 1860 mesh_recv_action_meshlmetric_req(struct ieee80211_node *ni,
 1861         const struct ieee80211_frame *wh,
 1862         const uint8_t *frm, const uint8_t *efrm)
 1863 {
 1864         uint32_t metric;
 1865 
 1866         metric = mesh_airtime_calc(ni);
 1867         ieee80211_send_action(ni,
 1868             IEEE80211_ACTION_CAT_MESHLMETRIC,
 1869             IEEE80211_ACTION_MESHLMETRIC_REP,
 1870             &metric);
 1871         return 0;
 1872 }
 1873 
 1874 static int
 1875 mesh_recv_action_meshlmetric_rep(struct ieee80211_node *ni,
 1876         const struct ieee80211_frame *wh,
 1877         const uint8_t *frm, const uint8_t *efrm)
 1878 {
 1879         return 0;
 1880 }
 1881 
 1882 static int
 1883 mesh_send_action(struct ieee80211_node *ni, struct mbuf *m)
 1884 {
 1885         struct ieee80211_bpf_params params;
 1886 
 1887         memset(&params, 0, sizeof(params));
 1888         params.ibp_pri = WME_AC_VO;
 1889         params.ibp_rate0 = ni->ni_txparms->mgmtrate;
 1890         /* XXX ucast/mcast */
 1891         params.ibp_try0 = ni->ni_txparms->maxretry;
 1892         params.ibp_power = ni->ni_txpower;
 1893         return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION,
 1894              &params);
 1895 }
 1896 
 1897 #define ADDSHORT(frm, v) do {                   \
 1898         frm[0] = (v) & 0xff;                    \
 1899         frm[1] = (v) >> 8;                      \
 1900         frm += 2;                               \
 1901 } while (0)
 1902 #define ADDWORD(frm, v) do {                    \
 1903         frm[0] = (v) & 0xff;                    \
 1904         frm[1] = ((v) >> 8) & 0xff;             \
 1905         frm[2] = ((v) >> 16) & 0xff;            \
 1906         frm[3] = ((v) >> 24) & 0xff;            \
 1907         frm += 4;                               \
 1908 } while (0)
 1909 
 1910 static int
 1911 mesh_send_action_meshpeering_open(struct ieee80211_node *ni,
 1912         int category, int action, void *args0)
 1913 {
 1914         struct ieee80211vap *vap = ni->ni_vap;
 1915         struct ieee80211com *ic = ni->ni_ic;
 1916         uint16_t *args = args0;
 1917         const struct ieee80211_rateset *rs;
 1918         struct mbuf *m;
 1919         uint8_t *frm;
 1920 
 1921         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1922             "send PEER OPEN action: localid 0x%x", args[0]);
 1923 
 1924         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1925             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 1926             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 1927         ieee80211_ref_node(ni);
 1928 
 1929         m = ieee80211_getmgtframe(&frm,
 1930             ic->ic_headroom + sizeof(struct ieee80211_frame),
 1931             sizeof(uint16_t)    /* action+category */
 1932             + sizeof(uint16_t)  /* capabilites */
 1933             + 2 + IEEE80211_RATE_SIZE    
 1934             + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)         
 1935             + 2 + IEEE80211_MESHID_LEN
 1936             + sizeof(struct ieee80211_meshconf_ie)       
 1937             + sizeof(struct ieee80211_meshpeer_ie)
 1938         );
 1939         if (m != NULL) {
 1940                 /*
 1941                  * mesh peer open action frame format:
 1942                  *   [1] category
 1943                  *   [1] action
 1944                  *   [2] capabilities
 1945                  *   [tlv] rates
 1946                  *   [tlv] xrates
 1947                  *   [tlv] mesh id
 1948                  *   [tlv] mesh conf
 1949                  *   [tlv] mesh peer link mgmt
 1950                  */
 1951                 *frm++ = category;
 1952                 *frm++ = action;
 1953                 ADDSHORT(frm, ieee80211_getcapinfo(vap, ni->ni_chan));
 1954                 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 1955                 frm = ieee80211_add_rates(frm, rs);
 1956                 frm = ieee80211_add_xrates(frm, rs);
 1957                 frm = ieee80211_add_meshid(frm, vap);
 1958                 frm = ieee80211_add_meshconf(frm, vap);
 1959                 frm = ieee80211_add_meshpeer(frm, IEEE80211_MESH_PEER_LINK_OPEN,
 1960                     args[0], 0, 0);
 1961                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 1962                 return mesh_send_action(ni, m);
 1963         } else {
 1964                 vap->iv_stats.is_tx_nobuf++;
 1965                 ieee80211_free_node(ni);
 1966                 return ENOMEM;
 1967         }
 1968 }
 1969 
 1970 static int
 1971 mesh_send_action_meshpeering_confirm(struct ieee80211_node *ni,
 1972         int category, int action, void *args0)
 1973 {
 1974         struct ieee80211vap *vap = ni->ni_vap;
 1975         struct ieee80211com *ic = ni->ni_ic;
 1976         uint16_t *args = args0;
 1977         const struct ieee80211_rateset *rs;
 1978         struct mbuf *m;
 1979         uint8_t *frm;
 1980 
 1981         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 1982             "send PEER CONFIRM action: localid 0x%x, peerid 0x%x",
 1983             args[0], args[1]);
 1984 
 1985         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1986             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 1987             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 1988         ieee80211_ref_node(ni);
 1989 
 1990         m = ieee80211_getmgtframe(&frm,
 1991             ic->ic_headroom + sizeof(struct ieee80211_frame),
 1992             sizeof(uint16_t)    /* action+category */
 1993             + sizeof(uint16_t)  /* capabilites */
 1994             + sizeof(uint16_t)  /* status code */
 1995             + sizeof(uint16_t)  /* AID */
 1996             + 2 + IEEE80211_RATE_SIZE    
 1997             + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)         
 1998             + 2 + IEEE80211_MESHID_LEN
 1999             + sizeof(struct ieee80211_meshconf_ie)       
 2000             + sizeof(struct ieee80211_meshpeer_ie)
 2001         );
 2002         if (m != NULL) {
 2003                 /*
 2004                  * mesh peer confirm action frame format:
 2005                  *   [1] category
 2006                  *   [1] action
 2007                  *   [2] capabilities
 2008                  *   [2] status code
 2009                  *   [2] association id (peer ID)
 2010                  *   [tlv] rates
 2011                  *   [tlv] xrates
 2012                  *   [tlv] mesh id
 2013                  *   [tlv] mesh conf
 2014                  *   [tlv] mesh peer link mgmt
 2015                  */
 2016                 *frm++ = category;
 2017                 *frm++ = action;
 2018                 ADDSHORT(frm, ieee80211_getcapinfo(vap, ni->ni_chan));
 2019                 ADDSHORT(frm, 0);               /* status code */
 2020                 ADDSHORT(frm, args[1]);         /* AID */
 2021                 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 2022                 frm = ieee80211_add_rates(frm, rs);
 2023                 frm = ieee80211_add_xrates(frm, rs);
 2024                 frm = ieee80211_add_meshid(frm, vap);
 2025                 frm = ieee80211_add_meshconf(frm, vap);
 2026                 frm = ieee80211_add_meshpeer(frm,
 2027                     IEEE80211_MESH_PEER_LINK_CONFIRM,
 2028                     args[0], args[1], 0);
 2029                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2030                 return mesh_send_action(ni, m);
 2031         } else {
 2032                 vap->iv_stats.is_tx_nobuf++;
 2033                 ieee80211_free_node(ni);
 2034                 return ENOMEM;
 2035         }
 2036 }
 2037 
 2038 static int
 2039 mesh_send_action_meshpeering_close(struct ieee80211_node *ni,
 2040         int category, int action, void *args0)
 2041 {
 2042         struct ieee80211vap *vap = ni->ni_vap;
 2043         struct ieee80211com *ic = ni->ni_ic;
 2044         uint16_t *args = args0;
 2045         struct mbuf *m;
 2046         uint8_t *frm;
 2047 
 2048         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2049             "send PEER CLOSE action: localid 0x%x, peerid 0x%x reason %d",
 2050             args[0], args[1], args[2]);
 2051 
 2052         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2053             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2054             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2055         ieee80211_ref_node(ni);
 2056 
 2057         m = ieee80211_getmgtframe(&frm,
 2058             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2059             sizeof(uint16_t)    /* action+category */
 2060             + sizeof(uint16_t)  /* reason code */
 2061             + 2 + IEEE80211_MESHID_LEN
 2062             + sizeof(struct ieee80211_meshpeer_ie) 
 2063         );
 2064         if (m != NULL) {
 2065                 /*
 2066                  * mesh peer close action frame format:
 2067                  *   [1] category
 2068                  *   [1] action
 2069                  *   [2] reason code
 2070                  *   [tlv] mesh id
 2071                  *   [tlv] mesh peer link mgmt
 2072                  */
 2073                 *frm++ = category;
 2074                 *frm++ = action;
 2075                 ADDSHORT(frm, args[2]);         /* reason code */
 2076                 frm = ieee80211_add_meshid(frm, vap);
 2077                 frm = ieee80211_add_meshpeer(frm,
 2078                     IEEE80211_MESH_PEER_LINK_CLOSE,
 2079                     args[0], args[1], args[2]);
 2080                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2081                 return mesh_send_action(ni, m);
 2082         } else {
 2083                 vap->iv_stats.is_tx_nobuf++;
 2084                 ieee80211_free_node(ni);
 2085                 return ENOMEM;
 2086         }
 2087 }
 2088 
 2089 static int
 2090 mesh_send_action_meshlink_request(struct ieee80211_node *ni,
 2091         int category, int action, void *arg0)
 2092 {
 2093         struct ieee80211vap *vap = ni->ni_vap;
 2094         struct ieee80211com *ic = ni->ni_ic;
 2095         struct mbuf *m;
 2096         uint8_t *frm;
 2097 
 2098         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2099             "%s", "send LINK METRIC REQUEST action");
 2100 
 2101         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2102             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2103             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2104         ieee80211_ref_node(ni);
 2105 
 2106         m = ieee80211_getmgtframe(&frm,
 2107             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2108             sizeof(uint16_t)    /* action+category */
 2109         );
 2110         if (m != NULL) {
 2111                 /*
 2112                  * mesh link metric request
 2113                  *   [1] category
 2114                  *   [1] action
 2115                  */
 2116                 *frm++ = category;
 2117                 *frm++ = action;
 2118                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2119                 return mesh_send_action(ni, m);
 2120         } else {
 2121                 vap->iv_stats.is_tx_nobuf++;
 2122                 ieee80211_free_node(ni);
 2123                 return ENOMEM;
 2124         }
 2125 }
 2126 
 2127 static int
 2128 mesh_send_action_meshlink_reply(struct ieee80211_node *ni,
 2129         int category, int action, void *args0)
 2130 {
 2131         struct ieee80211vap *vap = ni->ni_vap;
 2132         struct ieee80211com *ic = ni->ni_ic;
 2133         uint32_t *metric = args0;
 2134         struct mbuf *m;
 2135         uint8_t *frm;
 2136 
 2137         IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_MESH, ni,
 2138             "send LINK METRIC REPLY action: metric 0x%x", *metric);
 2139 
 2140         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2141             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", __func__, __LINE__,
 2142             ni, ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)+1);
 2143         ieee80211_ref_node(ni);
 2144 
 2145         m = ieee80211_getmgtframe(&frm,
 2146             ic->ic_headroom + sizeof(struct ieee80211_frame),
 2147             sizeof(uint16_t)    /* action+category */
 2148             + sizeof(struct ieee80211_meshlmetric_ie)
 2149         );
 2150         if (m != NULL) {
 2151                 /*
 2152                  * mesh link metric reply
 2153                  *   [1] category
 2154                  *   [1] action
 2155                  *   [tlv] mesh link metric
 2156                  */
 2157                 *frm++ = category;
 2158                 *frm++ = action;
 2159                 frm = ieee80211_add_meshlmetric(frm, *metric);
 2160                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2161                 return mesh_send_action(ni, m);
 2162         } else {
 2163                 vap->iv_stats.is_tx_nobuf++;
 2164                 ieee80211_free_node(ni);
 2165                 return ENOMEM;
 2166         }
 2167 }
 2168 
 2169 static void
 2170 mesh_peer_timeout_setup(struct ieee80211_node *ni)
 2171 {
 2172         switch (ni->ni_mlstate) {
 2173         case IEEE80211_NODE_MESH_HOLDING:
 2174                 ni->ni_mltval = ieee80211_mesh_holdingtimeout;
 2175                 break;
 2176         case IEEE80211_NODE_MESH_CONFIRMRCV:
 2177                 ni->ni_mltval = ieee80211_mesh_confirmtimeout;
 2178                 break;
 2179         case IEEE80211_NODE_MESH_IDLE:
 2180                 ni->ni_mltval = 0;
 2181                 break;
 2182         default:
 2183                 ni->ni_mltval = ieee80211_mesh_retrytimeout;
 2184                 break;
 2185         }
 2186         if (ni->ni_mltval)
 2187                 callout_reset(&ni->ni_mltimer, ni->ni_mltval,
 2188                     mesh_peer_timeout_cb, ni);
 2189 }
 2190 
 2191 /*
 2192  * Same as above but backoffs timer statisically 50%.
 2193  */
 2194 static void
 2195 mesh_peer_timeout_backoff(struct ieee80211_node *ni)
 2196 {
 2197         uint32_t r;
 2198         
 2199         r = arc4random();
 2200         ni->ni_mltval += r % ni->ni_mltval;
 2201         callout_reset(&ni->ni_mltimer, ni->ni_mltval, mesh_peer_timeout_cb,
 2202             ni);
 2203 }
 2204 
 2205 static __inline void
 2206 mesh_peer_timeout_stop(struct ieee80211_node *ni)
 2207 {
 2208         callout_drain(&ni->ni_mltimer);
 2209 }
 2210 
 2211 /*
 2212  * Mesh Peer Link Management FSM timeout handling.
 2213  */
 2214 static void
 2215 mesh_peer_timeout_cb(void *arg)
 2216 {
 2217         struct ieee80211_node *ni = (struct ieee80211_node *)arg;
 2218         uint16_t args[3];
 2219 
 2220         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_MESH,
 2221             ni, "mesh link timeout, state %d, retry counter %d",
 2222             ni->ni_mlstate, ni->ni_mlrcnt);
 2223         
 2224         switch (ni->ni_mlstate) {
 2225         case IEEE80211_NODE_MESH_IDLE:
 2226         case IEEE80211_NODE_MESH_ESTABLISHED:
 2227                 break;
 2228         case IEEE80211_NODE_MESH_OPENSNT:
 2229         case IEEE80211_NODE_MESH_OPENRCV:
 2230                 if (ni->ni_mlrcnt == ieee80211_mesh_maxretries) {
 2231                         args[0] = ni->ni_mlpid;
 2232                         args[2] = IEEE80211_REASON_MESH_MAX_RETRIES;
 2233                         ieee80211_send_action(ni,
 2234                             IEEE80211_ACTION_CAT_MESHPEERING,
 2235                             IEEE80211_ACTION_MESHPEERING_CLOSE, args);
 2236                         ni->ni_mlrcnt = 0;
 2237                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 2238                         mesh_peer_timeout_setup(ni);
 2239                 } else {
 2240                         args[0] = ni->ni_mlpid;
 2241                         ieee80211_send_action(ni,
 2242                             IEEE80211_ACTION_CAT_MESHPEERING,
 2243                             IEEE80211_ACTION_MESHPEERING_OPEN, args);
 2244                         ni->ni_mlrcnt++;
 2245                         mesh_peer_timeout_backoff(ni);
 2246                 }
 2247                 break;
 2248         case IEEE80211_NODE_MESH_CONFIRMRCV:
 2249                 if (ni->ni_mlrcnt == ieee80211_mesh_maxretries) {
 2250                         args[0] = ni->ni_mlpid;
 2251                         args[2] = IEEE80211_REASON_MESH_CONFIRM_TIMEOUT;
 2252                         ieee80211_send_action(ni,
 2253                             IEEE80211_ACTION_CAT_MESHPEERING,
 2254                             IEEE80211_ACTION_MESHPEERING_CLOSE, args);
 2255                         ni->ni_mlrcnt = 0;
 2256                         mesh_linkchange(ni, IEEE80211_NODE_MESH_HOLDING);
 2257                         mesh_peer_timeout_setup(ni);
 2258                 } else {
 2259                         ni->ni_mlrcnt++;
 2260                         mesh_peer_timeout_setup(ni);
 2261                 }
 2262                 break;
 2263         case IEEE80211_NODE_MESH_HOLDING:
 2264                 mesh_linkchange(ni, IEEE80211_NODE_MESH_IDLE);
 2265                 break;
 2266         }
 2267 }
 2268 
 2269 static int
 2270 mesh_verify_meshid(struct ieee80211vap *vap, const uint8_t *ie)
 2271 {
 2272         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2273 
 2274         if (ie == NULL || ie[1] != ms->ms_idlen)
 2275                 return 1;
 2276         return memcmp(ms->ms_id, ie + 2, ms->ms_idlen);
 2277 }
 2278 
 2279 /*
 2280  * Check if we are using the same algorithms for this mesh.
 2281  */
 2282 static int
 2283 mesh_verify_meshconf(struct ieee80211vap *vap, const uint8_t *ie)
 2284 {
 2285         const struct ieee80211_meshconf_ie *meshconf =
 2286             (const struct ieee80211_meshconf_ie *) ie;
 2287         const struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2288 
 2289         if (meshconf == NULL)
 2290                 return 1;
 2291         if (meshconf->conf_pselid != ms->ms_ppath->mpp_ie) {
 2292                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2293                     "unknown path selection algorithm: 0x%x\n",
 2294                     meshconf->conf_pselid);
 2295                 return 1;
 2296         }
 2297         if (meshconf->conf_pmetid != ms->ms_pmetric->mpm_ie) {
 2298                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2299                     "unknown path metric algorithm: 0x%x\n",
 2300                     meshconf->conf_pmetid);
 2301                 return 1;
 2302         }
 2303         if (meshconf->conf_ccid != 0) {
 2304                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2305                     "unknown congestion control algorithm: 0x%x\n",
 2306                     meshconf->conf_ccid);
 2307                 return 1;
 2308         }
 2309         if (meshconf->conf_syncid != IEEE80211_MESHCONF_SYNC_NEIGHOFF) {
 2310                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2311                     "unknown sync algorithm: 0x%x\n",
 2312                     meshconf->conf_syncid);
 2313                 return 1;
 2314         }
 2315         if (meshconf->conf_authid != 0) {
 2316                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2317                     "unknown auth auth algorithm: 0x%x\n",
 2318                     meshconf->conf_pselid);
 2319                 return 1;
 2320         }
 2321         /* Not accepting peers */
 2322         if (!(meshconf->conf_cap & IEEE80211_MESHCONF_CAP_AP)) {
 2323                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_MESH,
 2324                     "not accepting peers: 0x%x\n", meshconf->conf_cap);
 2325                 return 1;
 2326         }
 2327         return 0;
 2328 }
 2329 
 2330 static int
 2331 mesh_verify_meshpeer(struct ieee80211vap *vap, uint8_t subtype,
 2332     const uint8_t *ie)
 2333 {
 2334         const struct ieee80211_meshpeer_ie *meshpeer =
 2335             (const struct ieee80211_meshpeer_ie *) ie;
 2336 
 2337         if (meshpeer == NULL || meshpeer->peer_len < 6 ||
 2338             meshpeer->peer_len > 10)
 2339                 return 1;
 2340         switch (subtype) {
 2341         case IEEE80211_MESH_PEER_LINK_OPEN:
 2342                 if (meshpeer->peer_len != 6)
 2343                         return 1;
 2344                 break;
 2345         case IEEE80211_MESH_PEER_LINK_CONFIRM:
 2346                 if (meshpeer->peer_len != 8)
 2347                         return 1;
 2348                 break;
 2349         case IEEE80211_MESH_PEER_LINK_CLOSE:
 2350                 if (meshpeer->peer_len < 8)
 2351                         return 1;
 2352                 if (meshpeer->peer_len == 8 && meshpeer->peer_linkid != 0)
 2353                         return 1;
 2354                 if (meshpeer->peer_rcode == 0)
 2355                         return 1;
 2356                 break;
 2357         }
 2358         return 0;
 2359 }
 2360 
 2361 /*
 2362  * Add a Mesh ID IE to a frame.
 2363  */
 2364 uint8_t *
 2365 ieee80211_add_meshid(uint8_t *frm, struct ieee80211vap *vap)
 2366 {
 2367         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2368 
 2369         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, ("not a mbss vap"));
 2370 
 2371         *frm++ = IEEE80211_ELEMID_MESHID;
 2372         *frm++ = ms->ms_idlen;
 2373         memcpy(frm, ms->ms_id, ms->ms_idlen);
 2374         return frm + ms->ms_idlen;
 2375 }
 2376 
 2377 /*
 2378  * Add a Mesh Configuration IE to a frame.
 2379  * For now just use HWMP routing, Airtime link metric, Null Congestion
 2380  * Signaling, Null Sync Protocol and Null Authentication.
 2381  */
 2382 uint8_t *
 2383 ieee80211_add_meshconf(uint8_t *frm, struct ieee80211vap *vap)
 2384 {
 2385         const struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2386 
 2387         KASSERT(vap->iv_opmode == IEEE80211_M_MBSS, ("not a MBSS vap"));
 2388 
 2389         *frm++ = IEEE80211_ELEMID_MESHCONF;
 2390         *frm++ = sizeof(struct ieee80211_meshconf_ie) - 2;
 2391         *frm++ = ms->ms_ppath->mpp_ie;          /* path selection */
 2392         *frm++ = ms->ms_pmetric->mpm_ie;        /* link metric */
 2393         *frm++ = IEEE80211_MESHCONF_CC_DISABLED;
 2394         *frm++ = IEEE80211_MESHCONF_SYNC_NEIGHOFF;
 2395         *frm++ = IEEE80211_MESHCONF_AUTH_DISABLED;
 2396         /* NB: set the number of neighbors before the rest */
 2397         *frm = (ms->ms_neighbors > 15 ? 15 : ms->ms_neighbors) << 1;
 2398         if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
 2399                 *frm |= IEEE80211_MESHCONF_FORM_MP;
 2400         frm += 1;
 2401         if (ms->ms_flags & IEEE80211_MESHFLAGS_AP)
 2402                 *frm |= IEEE80211_MESHCONF_CAP_AP;
 2403         if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)
 2404                 *frm |= IEEE80211_MESHCONF_CAP_FWRD;
 2405         frm += 1;
 2406         return frm;
 2407 }
 2408 
 2409 /*
 2410  * Add a Mesh Peer Management IE to a frame.
 2411  */
 2412 uint8_t *
 2413 ieee80211_add_meshpeer(uint8_t *frm, uint8_t subtype, uint16_t localid,
 2414     uint16_t peerid, uint16_t reason)
 2415 {
 2416         /* XXX change for AH */
 2417         static const uint8_t meshpeerproto[4] = IEEE80211_MESH_PEER_PROTO;
 2418 
 2419         KASSERT(localid != 0, ("localid == 0"));
 2420 
 2421         *frm++ = IEEE80211_ELEMID_MESHPEER;
 2422         switch (subtype) {
 2423         case IEEE80211_MESH_PEER_LINK_OPEN:
 2424                 *frm++ = 6;             /* length */
 2425                 memcpy(frm, meshpeerproto, 4);
 2426                 frm += 4;
 2427                 ADDSHORT(frm, localid); /* local ID */
 2428                 break;
 2429         case IEEE80211_MESH_PEER_LINK_CONFIRM:
 2430                 KASSERT(peerid != 0, ("sending peer confirm without peer id"));
 2431                 *frm++ = 8;             /* length */
 2432                 memcpy(frm, meshpeerproto, 4);
 2433                 frm += 4;
 2434                 ADDSHORT(frm, localid); /* local ID */
 2435                 ADDSHORT(frm, peerid);  /* peer ID */
 2436                 break;
 2437         case IEEE80211_MESH_PEER_LINK_CLOSE:
 2438                 if (peerid)
 2439                         *frm++ = 10;    /* length */
 2440                 else
 2441                         *frm++ = 8;     /* length */
 2442                 memcpy(frm, meshpeerproto, 4);
 2443                 frm += 4;
 2444                 ADDSHORT(frm, localid); /* local ID */
 2445                 if (peerid)
 2446                         ADDSHORT(frm, peerid);  /* peer ID */
 2447                 ADDSHORT(frm, reason);
 2448                 break;
 2449         }
 2450         return frm;
 2451 }
 2452 
 2453 /*
 2454  * Compute an Airtime Link Metric for the link with this node.
 2455  *
 2456  * Based on Draft 3.0 spec (11B.10, p.149).
 2457  */
 2458 /*
 2459  * Max 802.11s overhead.
 2460  */
 2461 #define IEEE80211_MESH_MAXOVERHEAD \
 2462         (sizeof(struct ieee80211_qosframe_addr4) \
 2463          + sizeof(struct ieee80211_meshcntl_ae11) \
 2464         + sizeof(struct llc) \
 2465         + IEEE80211_ADDR_LEN \
 2466         + IEEE80211_WEP_IVLEN \
 2467         + IEEE80211_WEP_KIDLEN \
 2468         + IEEE80211_WEP_CRCLEN \
 2469         + IEEE80211_WEP_MICLEN \
 2470         + IEEE80211_CRC_LEN)
 2471 uint32_t
 2472 mesh_airtime_calc(struct ieee80211_node *ni)
 2473 {
 2474 #define M_BITS 8
 2475 #define S_FACTOR (2 * M_BITS)
 2476         struct ieee80211com *ic = ni->ni_ic;
 2477         struct ifnet *ifp = ni->ni_vap->iv_ifp;
 2478         const static int nbits = 8192 << M_BITS;
 2479         uint32_t overhead, rate, errrate;
 2480         uint64_t res;
 2481 
 2482         /* Time to transmit a frame */
 2483         rate = ni->ni_txrate;
 2484         overhead = ieee80211_compute_duration(ic->ic_rt,
 2485             ifp->if_mtu + IEEE80211_MESH_MAXOVERHEAD, rate, 0) << M_BITS;
 2486         /* Error rate in percentage */
 2487         /* XXX assuming small failures are ok */
 2488         errrate = (((ifp->if_oerrors +
 2489             ifp->if_ierrors) / 100) << M_BITS) / 100;
 2490         res = (overhead + (nbits / rate)) *
 2491             ((1 << S_FACTOR) / ((1 << M_BITS) - errrate));
 2492 
 2493         return (uint32_t)(res >> S_FACTOR);
 2494 #undef M_BITS
 2495 #undef S_FACTOR
 2496 }
 2497 
 2498 /*
 2499  * Add a Mesh Link Metric report IE to a frame.
 2500  */
 2501 uint8_t *
 2502 ieee80211_add_meshlmetric(uint8_t *frm, uint32_t metric)
 2503 {
 2504         *frm++ = IEEE80211_ELEMID_MESHLINK;
 2505         *frm++ = 4;
 2506         ADDWORD(frm, metric);
 2507         return frm;
 2508 }
 2509 #undef ADDSHORT
 2510 #undef ADDWORD
 2511 
 2512 /*
 2513  * Initialize any mesh-specific node state.
 2514  */
 2515 void
 2516 ieee80211_mesh_node_init(struct ieee80211vap *vap, struct ieee80211_node *ni)
 2517 {
 2518         ni->ni_flags |= IEEE80211_NODE_QOS;
 2519         callout_init(&ni->ni_mltimer, CALLOUT_MPSAFE);
 2520 }
 2521 
 2522 /*
 2523  * Cleanup any mesh-specific node state.
 2524  */
 2525 void
 2526 ieee80211_mesh_node_cleanup(struct ieee80211_node *ni)
 2527 {
 2528         struct ieee80211vap *vap = ni->ni_vap;
 2529         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2530 
 2531         callout_drain(&ni->ni_mltimer);
 2532         /* NB: short-circuit callbacks after mesh_vdetach */
 2533         if (vap->iv_mesh != NULL)
 2534                 ms->ms_ppath->mpp_peerdown(ni);
 2535 }
 2536 
 2537 void
 2538 ieee80211_parse_meshid(struct ieee80211_node *ni, const uint8_t *ie)
 2539 {
 2540         ni->ni_meshidlen = ie[1];
 2541         memcpy(ni->ni_meshid, ie + 2, ie[1]);
 2542 }
 2543 
 2544 /*
 2545  * Setup mesh-specific node state on neighbor discovery.
 2546  */
 2547 void
 2548 ieee80211_mesh_init_neighbor(struct ieee80211_node *ni,
 2549         const struct ieee80211_frame *wh,
 2550         const struct ieee80211_scanparams *sp)
 2551 {
 2552         ieee80211_parse_meshid(ni, sp->meshid);
 2553 }
 2554 
 2555 static int
 2556 mesh_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2557 {
 2558         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2559         uint8_t tmpmeshid[IEEE80211_NWID_LEN];
 2560         struct ieee80211_mesh_route *rt;
 2561         struct ieee80211req_mesh_route *imr;
 2562         size_t len, off;
 2563         uint8_t *p;
 2564         int error;
 2565 
 2566         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2567                 return ENOSYS;
 2568 
 2569         error = 0;
 2570         switch (ireq->i_type) {
 2571         case IEEE80211_IOC_MESH_ID:
 2572                 ireq->i_len = ms->ms_idlen;
 2573                 memcpy(tmpmeshid, ms->ms_id, ireq->i_len);
 2574                 error = copyout(tmpmeshid, ireq->i_data, ireq->i_len);
 2575                 break;
 2576         case IEEE80211_IOC_MESH_AP:
 2577                 ireq->i_val = (ms->ms_flags & IEEE80211_MESHFLAGS_AP) != 0;
 2578                 break;
 2579         case IEEE80211_IOC_MESH_FWRD:
 2580                 ireq->i_val = (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) != 0;
 2581                 break;
 2582         case IEEE80211_IOC_MESH_TTL:
 2583                 ireq->i_val = ms->ms_ttl;
 2584                 break;
 2585         case IEEE80211_IOC_MESH_RTCMD:
 2586                 switch (ireq->i_val) {
 2587                 case IEEE80211_MESH_RTCMD_LIST:
 2588                         len = 0;
 2589                         MESH_RT_LOCK(ms);
 2590                         TAILQ_FOREACH(rt, &ms->ms_routes, rt_next) {
 2591                                 len += sizeof(*imr);
 2592                         }
 2593                         MESH_RT_UNLOCK(ms);
 2594                         if (len > ireq->i_len || ireq->i_len < sizeof(*imr)) {
 2595                                 ireq->i_len = len;
 2596                                 return ENOMEM;
 2597                         }
 2598                         ireq->i_len = len;
 2599                         /* XXX M_WAIT? */
 2600                         p = malloc(len, M_TEMP, M_NOWAIT | M_ZERO);
 2601                         if (p == NULL)
 2602                                 return ENOMEM;
 2603                         off = 0;
 2604                         MESH_RT_LOCK(ms);
 2605                         TAILQ_FOREACH(rt, &ms->ms_routes, rt_next) {
 2606                                 if (off >= len)
 2607                                         break;
 2608                                 imr = (struct ieee80211req_mesh_route *)
 2609                                     (p + off);
 2610                                 imr->imr_flags = rt->rt_flags;
 2611                                 IEEE80211_ADDR_COPY(imr->imr_dest,
 2612                                     rt->rt_dest);
 2613                                 IEEE80211_ADDR_COPY(imr->imr_nexthop,
 2614                                     rt->rt_nexthop);
 2615                                 imr->imr_metric = rt->rt_metric;
 2616                                 imr->imr_nhops = rt->rt_nhops;
 2617                                 imr->imr_lifetime = rt->rt_lifetime;
 2618                                 imr->imr_lastmseq = rt->rt_lastmseq;
 2619                                 off += sizeof(*imr);
 2620                         }
 2621                         MESH_RT_UNLOCK(ms);
 2622                         error = copyout(p, (uint8_t *)ireq->i_data,
 2623                             ireq->i_len);
 2624                         free(p, M_TEMP);
 2625                         break;
 2626                 case IEEE80211_MESH_RTCMD_FLUSH:
 2627                 case IEEE80211_MESH_RTCMD_ADD:
 2628                 case IEEE80211_MESH_RTCMD_DELETE:
 2629                         return EINVAL;
 2630                 default:
 2631                         return ENOSYS;
 2632                 }
 2633                 break;
 2634         case IEEE80211_IOC_MESH_PR_METRIC:
 2635                 len = strlen(ms->ms_pmetric->mpm_descr);
 2636                 if (ireq->i_len < len)
 2637                         return EINVAL;
 2638                 ireq->i_len = len;
 2639                 error = copyout(ms->ms_pmetric->mpm_descr,
 2640                     (uint8_t *)ireq->i_data, len);
 2641                 break;
 2642         case IEEE80211_IOC_MESH_PR_PATH:
 2643                 len = strlen(ms->ms_ppath->mpp_descr);
 2644                 if (ireq->i_len < len)
 2645                         return EINVAL;
 2646                 ireq->i_len = len;
 2647                 error = copyout(ms->ms_ppath->mpp_descr,
 2648                     (uint8_t *)ireq->i_data, len);
 2649                 break;
 2650         default:
 2651                 return ENOSYS;
 2652         }
 2653 
 2654         return error;
 2655 }
 2656 IEEE80211_IOCTL_GET(mesh, mesh_ioctl_get80211);
 2657 
 2658 static int
 2659 mesh_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 2660 {
 2661         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 2662         uint8_t tmpmeshid[IEEE80211_NWID_LEN];
 2663         uint8_t tmpaddr[IEEE80211_ADDR_LEN];
 2664         char tmpproto[IEEE80211_MESH_PROTO_DSZ];
 2665         int error;
 2666 
 2667         if (vap->iv_opmode != IEEE80211_M_MBSS)
 2668                 return ENOSYS;
 2669 
 2670         error = 0;
 2671         switch (ireq->i_type) {
 2672         case IEEE80211_IOC_MESH_ID:
 2673                 if (ireq->i_val != 0 || ireq->i_len > IEEE80211_MESHID_LEN)
 2674                         return EINVAL;
 2675                 error = copyin(ireq->i_data, tmpmeshid, ireq->i_len);
 2676                 if (error != 0)
 2677                         break;
 2678                 memset(ms->ms_id, 0, IEEE80211_NWID_LEN);
 2679                 ms->ms_idlen = ireq->i_len;
 2680                 memcpy(ms->ms_id, tmpmeshid, ireq->i_len);
 2681                 error = ENETRESET;
 2682                 break;
 2683         case IEEE80211_IOC_MESH_AP:
 2684                 if (ireq->i_val)
 2685                         ms->ms_flags |= IEEE80211_MESHFLAGS_AP;
 2686                 else
 2687                         ms->ms_flags &= ~IEEE80211_MESHFLAGS_AP;
 2688                 error = ENETRESET;
 2689                 break;
 2690         case IEEE80211_IOC_MESH_FWRD:
 2691                 if (ireq->i_val)
 2692                         ms->ms_flags |= IEEE80211_MESHFLAGS_FWD;
 2693                 else
 2694                         ms->ms_flags &= ~IEEE80211_MESHFLAGS_FWD;
 2695                 break;
 2696         case IEEE80211_IOC_MESH_TTL:
 2697                 ms->ms_ttl = (uint8_t) ireq->i_val;
 2698                 break;
 2699         case IEEE80211_IOC_MESH_RTCMD:
 2700                 switch (ireq->i_val) {
 2701                 case IEEE80211_MESH_RTCMD_LIST:
 2702                         return EINVAL;
 2703                 case IEEE80211_MESH_RTCMD_FLUSH:
 2704                         ieee80211_mesh_rt_flush(vap);
 2705                         break;
 2706                 case IEEE80211_MESH_RTCMD_ADD:
 2707                         if (IEEE80211_ADDR_EQ(vap->iv_myaddr, ireq->i_data) ||
 2708                             IEEE80211_ADDR_EQ(broadcastaddr, ireq->i_data))
 2709                                 return EINVAL;
 2710                         error = copyin(ireq->i_data, &tmpaddr,
 2711                             IEEE80211_ADDR_LEN);
 2712                         if (error == 0)
 2713                                 ieee80211_mesh_discover(vap, tmpaddr, NULL);
 2714                         break;
 2715                 case IEEE80211_MESH_RTCMD_DELETE:
 2716                         ieee80211_mesh_rt_del(vap, ireq->i_data);
 2717                         break;
 2718                 default:
 2719                         return ENOSYS;
 2720                 }
 2721                 break;
 2722         case IEEE80211_IOC_MESH_PR_METRIC:
 2723                 error = copyin(ireq->i_data, tmpproto, sizeof(tmpproto));
 2724                 if (error == 0) {
 2725                         error = mesh_select_proto_metric(vap, tmpproto);
 2726                         if (error == 0)
 2727                                 error = ENETRESET;
 2728                 }
 2729                 break;
 2730         case IEEE80211_IOC_MESH_PR_PATH:
 2731                 error = copyin(ireq->i_data, tmpproto, sizeof(tmpproto));
 2732                 if (error == 0) {
 2733                         error = mesh_select_proto_path(vap, tmpproto);
 2734                         if (error == 0)
 2735                                 error = ENETRESET;
 2736                 }
 2737                 break;
 2738         default:
 2739                 return ENOSYS;
 2740         }
 2741         return error;
 2742 }
 2743 IEEE80211_IOCTL_SET(mesh, mesh_ioctl_set80211);

Cache object: 9b7ac865afab473e46562ccc30962769


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