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


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_freebsd.c

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    1 /*-
    2  * Copyright (c) 2003-2009 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.0/sys/net80211/ieee80211_freebsd.c 259187 2013-12-10 19:17:31Z gavin $");
   28 
   29 /*
   30  * IEEE 802.11 support (FreeBSD-specific code)
   31  */
   32 #include "opt_wlan.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/systm.h> 
   37 #include <sys/linker.h>
   38 #include <sys/mbuf.h>   
   39 #include <sys/module.h>
   40 #include <sys/proc.h>
   41 #include <sys/sysctl.h>
   42 
   43 #include <sys/socket.h>
   44 
   45 #include <net/bpf.h>
   46 #include <net/if.h>
   47 #include <net/if_dl.h>
   48 #include <net/if_clone.h>
   49 #include <net/if_media.h>
   50 #include <net/if_types.h>
   51 #include <net/ethernet.h>
   52 #include <net/route.h>
   53 #include <net/vnet.h>
   54 
   55 #include <net80211/ieee80211_var.h>
   56 #include <net80211/ieee80211_input.h>
   57 
   58 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters");
   59 
   60 #ifdef IEEE80211_DEBUG
   61 int     ieee80211_debug = 0;
   62 SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug,
   63             0, "debugging printfs");
   64 #endif
   65 
   66 static MALLOC_DEFINE(M_80211_COM, "80211com", "802.11 com state");
   67 
   68 #if __FreeBSD_version >= 1000020
   69 static const char wlanname[] = "wlan";
   70 static struct if_clone *wlan_cloner;
   71 #endif
   72 
   73 /*
   74  * Allocate/free com structure in conjunction with ifnet;
   75  * these routines are registered with if_register_com_alloc
   76  * below and are called automatically by the ifnet code
   77  * when the ifnet of the parent device is created.
   78  */
   79 static void *
   80 wlan_alloc(u_char type, struct ifnet *ifp)
   81 {
   82         struct ieee80211com *ic;
   83 
   84         ic = malloc(sizeof(struct ieee80211com), M_80211_COM, M_WAITOK|M_ZERO);
   85         ic->ic_ifp = ifp;
   86 
   87         return (ic);
   88 }
   89 
   90 static void
   91 wlan_free(void *ic, u_char type)
   92 {
   93         free(ic, M_80211_COM);
   94 }
   95 
   96 static int
   97 wlan_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   98 {
   99         struct ieee80211_clone_params cp;
  100         struct ieee80211vap *vap;
  101         struct ieee80211com *ic;
  102         struct ifnet *ifp;
  103         int error;
  104 
  105         error = copyin(params, &cp, sizeof(cp));
  106         if (error)
  107                 return error;
  108         ifp = ifunit(cp.icp_parent);
  109         if (ifp == NULL)
  110                 return ENXIO;
  111         /* XXX move printfs to DIAGNOSTIC before release */
  112         if (ifp->if_type != IFT_IEEE80211) {
  113                 if_printf(ifp, "%s: reject, not an 802.11 device\n", __func__);
  114                 return ENXIO;
  115         }
  116         if (cp.icp_opmode >= IEEE80211_OPMODE_MAX) {
  117                 if_printf(ifp, "%s: invalid opmode %d\n",
  118                     __func__, cp.icp_opmode);
  119                 return EINVAL;
  120         }
  121         ic = ifp->if_l2com;
  122         if ((ic->ic_caps & ieee80211_opcap[cp.icp_opmode]) == 0) {
  123                 if_printf(ifp, "%s mode not supported\n",
  124                     ieee80211_opmode_name[cp.icp_opmode]);
  125                 return EOPNOTSUPP;
  126         }
  127         if ((cp.icp_flags & IEEE80211_CLONE_TDMA) &&
  128 #ifdef IEEE80211_SUPPORT_TDMA
  129             (ic->ic_caps & IEEE80211_C_TDMA) == 0
  130 #else
  131             (1)
  132 #endif
  133         ) {
  134                 if_printf(ifp, "TDMA not supported\n");
  135                 return EOPNOTSUPP;
  136         }
  137 #if __FreeBSD_version >= 1000020
  138         vap = ic->ic_vap_create(ic, wlanname, unit,
  139                         cp.icp_opmode, cp.icp_flags, cp.icp_bssid,
  140                         cp.icp_flags & IEEE80211_CLONE_MACADDR ?
  141                             cp.icp_macaddr : (const uint8_t *)IF_LLADDR(ifp));
  142 #else
  143         vap = ic->ic_vap_create(ic, ifc->ifc_name, unit,
  144                         cp.icp_opmode, cp.icp_flags, cp.icp_bssid,
  145                         cp.icp_flags & IEEE80211_CLONE_MACADDR ?
  146                             cp.icp_macaddr : (const uint8_t *)IF_LLADDR(ifp));
  147 
  148 #endif
  149 
  150         return (vap == NULL ? EIO : 0);
  151 }
  152 
  153 static void
  154 wlan_clone_destroy(struct ifnet *ifp)
  155 {
  156         struct ieee80211vap *vap = ifp->if_softc;
  157         struct ieee80211com *ic = vap->iv_ic;
  158 
  159         ic->ic_vap_delete(vap);
  160 }
  161 
  162 #if __FreeBSD_version < 1000020
  163 IFC_SIMPLE_DECLARE(wlan, 0);
  164 #endif
  165 
  166 void
  167 ieee80211_vap_destroy(struct ieee80211vap *vap)
  168 {
  169         CURVNET_SET(vap->iv_ifp->if_vnet);
  170 #if __FreeBSD_version >= 1000020
  171         if_clone_destroyif(wlan_cloner, vap->iv_ifp);
  172 #else
  173         if_clone_destroyif(&wlan_cloner, vap->iv_ifp);
  174 #endif
  175         CURVNET_RESTORE();
  176 }
  177 
  178 int
  179 ieee80211_sysctl_msecs_ticks(SYSCTL_HANDLER_ARGS)
  180 {
  181         int msecs = ticks_to_msecs(*(int *)arg1);
  182         int error, t;
  183 
  184         error = sysctl_handle_int(oidp, &msecs, 0, req);
  185         if (error || !req->newptr)
  186                 return error;
  187         t = msecs_to_ticks(msecs);
  188         *(int *)arg1 = (t < 1) ? 1 : t;
  189         return 0;
  190 }
  191 
  192 static int
  193 ieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS)
  194 {
  195         int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT;
  196         int error;
  197 
  198         error = sysctl_handle_int(oidp, &inact, 0, req);
  199         if (error || !req->newptr)
  200                 return error;
  201         *(int *)arg1 = inact / IEEE80211_INACT_WAIT;
  202         return 0;
  203 }
  204 
  205 static int
  206 ieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS)
  207 {
  208         struct ieee80211com *ic = arg1;
  209         const char *name = ic->ic_ifp->if_xname;
  210 
  211         return SYSCTL_OUT(req, name, strlen(name));
  212 }
  213 
  214 static int
  215 ieee80211_sysctl_radar(SYSCTL_HANDLER_ARGS)
  216 {
  217         struct ieee80211com *ic = arg1;
  218         int t = 0, error;
  219 
  220         error = sysctl_handle_int(oidp, &t, 0, req);
  221         if (error || !req->newptr)
  222                 return error;
  223         IEEE80211_LOCK(ic);
  224         ieee80211_dfs_notify_radar(ic, ic->ic_curchan);
  225         IEEE80211_UNLOCK(ic);
  226         return 0;
  227 }
  228 
  229 void
  230 ieee80211_sysctl_attach(struct ieee80211com *ic)
  231 {
  232 }
  233 
  234 void
  235 ieee80211_sysctl_detach(struct ieee80211com *ic)
  236 {
  237 }
  238 
  239 void
  240 ieee80211_sysctl_vattach(struct ieee80211vap *vap)
  241 {
  242         struct ifnet *ifp = vap->iv_ifp;
  243         struct sysctl_ctx_list *ctx;
  244         struct sysctl_oid *oid;
  245         char num[14];                   /* sufficient for 32 bits */
  246 
  247         ctx = (struct sysctl_ctx_list *) malloc(sizeof(struct sysctl_ctx_list),
  248                 M_DEVBUF, M_NOWAIT | M_ZERO);
  249         if (ctx == NULL) {
  250                 if_printf(ifp, "%s: cannot allocate sysctl context!\n",
  251                         __func__);
  252                 return;
  253         }
  254         sysctl_ctx_init(ctx);
  255         snprintf(num, sizeof(num), "%u", ifp->if_dunit);
  256         oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan),
  257                 OID_AUTO, num, CTLFLAG_RD, NULL, "");
  258         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  259                 "%parent", CTLTYPE_STRING | CTLFLAG_RD, vap->iv_ic, 0,
  260                 ieee80211_sysctl_parent, "A", "parent device");
  261         SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  262                 "driver_caps", CTLFLAG_RW, &vap->iv_caps, 0,
  263                 "driver capabilities");
  264 #ifdef IEEE80211_DEBUG
  265         vap->iv_debug = ieee80211_debug;
  266         SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  267                 "debug", CTLFLAG_RW, &vap->iv_debug, 0,
  268                 "control debugging printfs");
  269 #endif
  270         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  271                 "bmiss_max", CTLFLAG_RW, &vap->iv_bmiss_max, 0,
  272                 "consecutive beacon misses before scanning");
  273         /* XXX inherit from tunables */
  274         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  275                 "inact_run", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_run, 0,
  276                 ieee80211_sysctl_inact, "I",
  277                 "station inactivity timeout (sec)");
  278         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  279                 "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_probe, 0,
  280                 ieee80211_sysctl_inact, "I",
  281                 "station inactivity probe timeout (sec)");
  282         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  283                 "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_auth, 0,
  284                 ieee80211_sysctl_inact, "I",
  285                 "station authentication timeout (sec)");
  286         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  287                 "inact_init", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_init, 0,
  288                 ieee80211_sysctl_inact, "I",
  289                 "station initial state timeout (sec)");
  290         if (vap->iv_htcaps & IEEE80211_HTC_HT) {
  291                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  292                         "ampdu_mintraffic_bk", CTLFLAG_RW,
  293                         &vap->iv_ampdu_mintraffic[WME_AC_BK], 0,
  294                         "BK traffic tx aggr threshold (pps)");
  295                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  296                         "ampdu_mintraffic_be", CTLFLAG_RW,
  297                         &vap->iv_ampdu_mintraffic[WME_AC_BE], 0,
  298                         "BE traffic tx aggr threshold (pps)");
  299                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  300                         "ampdu_mintraffic_vo", CTLFLAG_RW,
  301                         &vap->iv_ampdu_mintraffic[WME_AC_VO], 0,
  302                         "VO traffic tx aggr threshold (pps)");
  303                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  304                         "ampdu_mintraffic_vi", CTLFLAG_RW,
  305                         &vap->iv_ampdu_mintraffic[WME_AC_VI], 0,
  306                         "VI traffic tx aggr threshold (pps)");
  307         }
  308         if (vap->iv_caps & IEEE80211_C_DFS) {
  309                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  310                         "radar", CTLTYPE_INT | CTLFLAG_RW, vap->iv_ic, 0,
  311                         ieee80211_sysctl_radar, "I", "simulate radar event");
  312         }
  313         vap->iv_sysctl = ctx;
  314         vap->iv_oid = oid;
  315 }
  316 
  317 void
  318 ieee80211_sysctl_vdetach(struct ieee80211vap *vap)
  319 {
  320 
  321         if (vap->iv_sysctl != NULL) {
  322                 sysctl_ctx_free(vap->iv_sysctl);
  323                 free(vap->iv_sysctl, M_DEVBUF);
  324                 vap->iv_sysctl = NULL;
  325         }
  326 }
  327 
  328 int
  329 ieee80211_node_dectestref(struct ieee80211_node *ni)
  330 {
  331         /* XXX need equivalent of atomic_dec_and_test */
  332         atomic_subtract_int(&ni->ni_refcnt, 1);
  333         return atomic_cmpset_int(&ni->ni_refcnt, 0, 1);
  334 }
  335 
  336 void
  337 ieee80211_drain_ifq(struct ifqueue *ifq)
  338 {
  339         struct ieee80211_node *ni;
  340         struct mbuf *m;
  341 
  342         for (;;) {
  343                 IF_DEQUEUE(ifq, m);
  344                 if (m == NULL)
  345                         break;
  346 
  347                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  348                 KASSERT(ni != NULL, ("frame w/o node"));
  349                 ieee80211_free_node(ni);
  350                 m->m_pkthdr.rcvif = NULL;
  351 
  352                 m_freem(m);
  353         }
  354 }
  355 
  356 void
  357 ieee80211_flush_ifq(struct ifqueue *ifq, struct ieee80211vap *vap)
  358 {
  359         struct ieee80211_node *ni;
  360         struct mbuf *m, **mprev;
  361 
  362         IF_LOCK(ifq);
  363         mprev = &ifq->ifq_head;
  364         while ((m = *mprev) != NULL) {
  365                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  366                 if (ni != NULL && ni->ni_vap == vap) {
  367                         *mprev = m->m_nextpkt;          /* remove from list */
  368                         ifq->ifq_len--;
  369 
  370                         m_freem(m);
  371                         ieee80211_free_node(ni);        /* reclaim ref */
  372                 } else
  373                         mprev = &m->m_nextpkt;
  374         }
  375         /* recalculate tail ptr */
  376         m = ifq->ifq_head;
  377         for (; m != NULL && m->m_nextpkt != NULL; m = m->m_nextpkt)
  378                 ;
  379         ifq->ifq_tail = m;
  380         IF_UNLOCK(ifq);
  381 }
  382 
  383 /*
  384  * As above, for mbufs allocated with m_gethdr/MGETHDR
  385  * or initialized by M_COPY_PKTHDR.
  386  */
  387 #define MC_ALIGN(m, len)                                                \
  388 do {                                                                    \
  389         (m)->m_data += (MCLBYTES - (len)) &~ (sizeof(long) - 1);        \
  390 } while (/* CONSTCOND */ 0)
  391 
  392 /*
  393  * Allocate and setup a management frame of the specified
  394  * size.  We return the mbuf and a pointer to the start
  395  * of the contiguous data area that's been reserved based
  396  * on the packet length.  The data area is forced to 32-bit
  397  * alignment and the buffer length to a multiple of 4 bytes.
  398  * This is done mainly so beacon frames (that require this)
  399  * can use this interface too.
  400  */
  401 struct mbuf *
  402 ieee80211_getmgtframe(uint8_t **frm, int headroom, int pktlen)
  403 {
  404         struct mbuf *m;
  405         u_int len;
  406 
  407         /*
  408          * NB: we know the mbuf routines will align the data area
  409          *     so we don't need to do anything special.
  410          */
  411         len = roundup2(headroom + pktlen, 4);
  412         KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
  413         if (len < MINCLSIZE) {
  414                 m = m_gethdr(M_NOWAIT, MT_DATA);
  415                 /*
  416                  * Align the data in case additional headers are added.
  417                  * This should only happen when a WEP header is added
  418                  * which only happens for shared key authentication mgt
  419                  * frames which all fit in MHLEN.
  420                  */
  421                 if (m != NULL)
  422                         MH_ALIGN(m, len);
  423         } else {
  424                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
  425                 if (m != NULL)
  426                         MC_ALIGN(m, len);
  427         }
  428         if (m != NULL) {
  429                 m->m_data += headroom;
  430                 *frm = m->m_data;
  431         }
  432         return m;
  433 }
  434 
  435 #ifndef __NO_STRICT_ALIGNMENT
  436 /*
  437  * Re-align the payload in the mbuf.  This is mainly used (right now)
  438  * to handle IP header alignment requirements on certain architectures.
  439  */
  440 struct mbuf *
  441 ieee80211_realign(struct ieee80211vap *vap, struct mbuf *m, size_t align)
  442 {
  443         int pktlen, space;
  444         struct mbuf *n;
  445 
  446         pktlen = m->m_pkthdr.len;
  447         space = pktlen + align;
  448         if (space < MINCLSIZE)
  449                 n = m_gethdr(M_NOWAIT, MT_DATA);
  450         else {
  451                 n = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
  452                     space <= MCLBYTES ?     MCLBYTES :
  453 #if MJUMPAGESIZE != MCLBYTES
  454                     space <= MJUMPAGESIZE ? MJUMPAGESIZE :
  455 #endif
  456                     space <= MJUM9BYTES ?   MJUM9BYTES : MJUM16BYTES);
  457         }
  458         if (__predict_true(n != NULL)) {
  459                 m_move_pkthdr(n, m);
  460                 n->m_data = (caddr_t)(ALIGN(n->m_data + align) - align);
  461                 m_copydata(m, 0, pktlen, mtod(n, caddr_t));
  462                 n->m_len = pktlen;
  463         } else {
  464                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  465                     mtod(m, const struct ieee80211_frame *), NULL,
  466                     "%s", "no mbuf to realign");
  467                 vap->iv_stats.is_rx_badalign++;
  468         }
  469         m_freem(m);
  470         return n;
  471 }
  472 #endif /* !__NO_STRICT_ALIGNMENT */
  473 
  474 int
  475 ieee80211_add_callback(struct mbuf *m,
  476         void (*func)(struct ieee80211_node *, void *, int), void *arg)
  477 {
  478         struct m_tag *mtag;
  479         struct ieee80211_cb *cb;
  480 
  481         mtag = m_tag_alloc(MTAG_ABI_NET80211, NET80211_TAG_CALLBACK,
  482                         sizeof(struct ieee80211_cb), M_NOWAIT);
  483         if (mtag == NULL)
  484                 return 0;
  485 
  486         cb = (struct ieee80211_cb *)(mtag+1);
  487         cb->func = func;
  488         cb->arg = arg;
  489         m_tag_prepend(m, mtag);
  490         m->m_flags |= M_TXCB;
  491         return 1;
  492 }
  493 
  494 void
  495 ieee80211_process_callback(struct ieee80211_node *ni,
  496         struct mbuf *m, int status)
  497 {
  498         struct m_tag *mtag;
  499 
  500         mtag = m_tag_locate(m, MTAG_ABI_NET80211, NET80211_TAG_CALLBACK, NULL);
  501         if (mtag != NULL) {
  502                 struct ieee80211_cb *cb = (struct ieee80211_cb *)(mtag+1);
  503                 cb->func(ni, cb->arg, status);
  504         }
  505 }
  506 
  507 /*
  508  * Transmit a frame to the parent interface.
  509  *
  510  * TODO: if the transmission fails, make sure the parent node is freed
  511  *   (the callers will first need modifying.)
  512  */
  513 int
  514 ieee80211_parent_xmitpkt(struct ieee80211com *ic,
  515         struct mbuf *m)
  516 {
  517         struct ifnet *parent = ic->ic_ifp;
  518         /*
  519          * Assert the IC TX lock is held - this enforces the
  520          * processing -> queuing order is maintained
  521          */
  522         IEEE80211_TX_LOCK_ASSERT(ic);
  523 
  524         return (parent->if_transmit(parent, m));
  525 }
  526 
  527 /*
  528  * Transmit a frame to the VAP interface.
  529  */
  530 int
  531 ieee80211_vap_xmitpkt(struct ieee80211vap *vap, struct mbuf *m)
  532 {
  533         struct ifnet *ifp = vap->iv_ifp;
  534 
  535         /*
  536          * When transmitting via the VAP, we shouldn't hold
  537          * any IC TX lock as the VAP TX path will acquire it.
  538          */
  539         IEEE80211_TX_UNLOCK_ASSERT(vap->iv_ic);
  540 
  541         return (ifp->if_transmit(ifp, m));
  542 
  543 }
  544 
  545 #include <sys/libkern.h>
  546 
  547 void
  548 get_random_bytes(void *p, size_t n)
  549 {
  550         uint8_t *dp = p;
  551 
  552         while (n > 0) {
  553                 uint32_t v = arc4random();
  554                 size_t nb = n > sizeof(uint32_t) ? sizeof(uint32_t) : n;
  555                 bcopy(&v, dp, n > sizeof(uint32_t) ? sizeof(uint32_t) : n);
  556                 dp += sizeof(uint32_t), n -= nb;
  557         }
  558 }
  559 
  560 /*
  561  * Helper function for events that pass just a single mac address.
  562  */
  563 static void
  564 notify_macaddr(struct ifnet *ifp, int op, const uint8_t mac[IEEE80211_ADDR_LEN])
  565 {
  566         struct ieee80211_join_event iev;
  567 
  568         CURVNET_SET(ifp->if_vnet);
  569         memset(&iev, 0, sizeof(iev));
  570         IEEE80211_ADDR_COPY(iev.iev_addr, mac);
  571         rt_ieee80211msg(ifp, op, &iev, sizeof(iev));
  572         CURVNET_RESTORE();
  573 }
  574 
  575 void
  576 ieee80211_notify_node_join(struct ieee80211_node *ni, int newassoc)
  577 {
  578         struct ieee80211vap *vap = ni->ni_vap;
  579         struct ifnet *ifp = vap->iv_ifp;
  580 
  581         CURVNET_SET_QUIET(ifp->if_vnet);
  582         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%snode join",
  583             (ni == vap->iv_bss) ? "bss " : "");
  584 
  585         if (ni == vap->iv_bss) {
  586                 notify_macaddr(ifp, newassoc ?
  587                     RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, ni->ni_bssid);
  588                 if_link_state_change(ifp, LINK_STATE_UP);
  589         } else {
  590                 notify_macaddr(ifp, newassoc ?
  591                     RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN, ni->ni_macaddr);
  592         }
  593         CURVNET_RESTORE();
  594 }
  595 
  596 void
  597 ieee80211_notify_node_leave(struct ieee80211_node *ni)
  598 {
  599         struct ieee80211vap *vap = ni->ni_vap;
  600         struct ifnet *ifp = vap->iv_ifp;
  601 
  602         CURVNET_SET_QUIET(ifp->if_vnet);
  603         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%snode leave",
  604             (ni == vap->iv_bss) ? "bss " : "");
  605 
  606         if (ni == vap->iv_bss) {
  607                 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
  608                 if_link_state_change(ifp, LINK_STATE_DOWN);
  609         } else {
  610                 /* fire off wireless event station leaving */
  611                 notify_macaddr(ifp, RTM_IEEE80211_LEAVE, ni->ni_macaddr);
  612         }
  613         CURVNET_RESTORE();
  614 }
  615 
  616 void
  617 ieee80211_notify_scan_done(struct ieee80211vap *vap)
  618 {
  619         struct ifnet *ifp = vap->iv_ifp;
  620 
  621         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", "notify scan done");
  622 
  623         /* dispatch wireless event indicating scan completed */
  624         CURVNET_SET(ifp->if_vnet);
  625         rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
  626         CURVNET_RESTORE();
  627 }
  628 
  629 void
  630 ieee80211_notify_replay_failure(struct ieee80211vap *vap,
  631         const struct ieee80211_frame *wh, const struct ieee80211_key *k,
  632         u_int64_t rsc, int tid)
  633 {
  634         struct ifnet *ifp = vap->iv_ifp;
  635 
  636         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  637             "%s replay detected tid %d <rsc %ju, csc %ju, keyix %u rxkeyix %u>",
  638             k->wk_cipher->ic_name, tid, (intmax_t) rsc,
  639             (intmax_t) k->wk_keyrsc[tid],
  640             k->wk_keyix, k->wk_rxkeyix);
  641 
  642         if (ifp != NULL) {              /* NB: for cipher test modules */
  643                 struct ieee80211_replay_event iev;
  644 
  645                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  646                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  647                 iev.iev_cipher = k->wk_cipher->ic_cipher;
  648                 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE)
  649                         iev.iev_keyix = k->wk_rxkeyix;
  650                 else
  651                         iev.iev_keyix = k->wk_keyix;
  652                 iev.iev_keyrsc = k->wk_keyrsc[tid];
  653                 iev.iev_rsc = rsc;
  654                 CURVNET_SET(ifp->if_vnet);
  655                 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
  656                 CURVNET_RESTORE();
  657         }
  658 }
  659 
  660 void
  661 ieee80211_notify_michael_failure(struct ieee80211vap *vap,
  662         const struct ieee80211_frame *wh, u_int keyix)
  663 {
  664         struct ifnet *ifp = vap->iv_ifp;
  665 
  666         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  667             "michael MIC verification failed <keyix %u>", keyix);
  668         vap->iv_stats.is_rx_tkipmic++;
  669 
  670         if (ifp != NULL) {              /* NB: for cipher test modules */
  671                 struct ieee80211_michael_event iev;
  672 
  673                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  674                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  675                 iev.iev_cipher = IEEE80211_CIPHER_TKIP;
  676                 iev.iev_keyix = keyix;
  677                 CURVNET_SET(ifp->if_vnet);
  678                 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
  679                 CURVNET_RESTORE();
  680         }
  681 }
  682 
  683 void
  684 ieee80211_notify_wds_discover(struct ieee80211_node *ni)
  685 {
  686         struct ieee80211vap *vap = ni->ni_vap;
  687         struct ifnet *ifp = vap->iv_ifp;
  688 
  689         notify_macaddr(ifp, RTM_IEEE80211_WDS, ni->ni_macaddr);
  690 }
  691 
  692 void
  693 ieee80211_notify_csa(struct ieee80211com *ic,
  694         const struct ieee80211_channel *c, int mode, int count)
  695 {
  696         struct ifnet *ifp = ic->ic_ifp;
  697         struct ieee80211_csa_event iev;
  698 
  699         memset(&iev, 0, sizeof(iev));
  700         iev.iev_flags = c->ic_flags;
  701         iev.iev_freq = c->ic_freq;
  702         iev.iev_ieee = c->ic_ieee;
  703         iev.iev_mode = mode;
  704         iev.iev_count = count;
  705         CURVNET_SET(ifp->if_vnet);
  706         rt_ieee80211msg(ifp, RTM_IEEE80211_CSA, &iev, sizeof(iev));
  707         CURVNET_RESTORE();
  708 }
  709 
  710 void
  711 ieee80211_notify_radar(struct ieee80211com *ic,
  712         const struct ieee80211_channel *c)
  713 {
  714         struct ifnet *ifp = ic->ic_ifp;
  715         struct ieee80211_radar_event iev;
  716 
  717         memset(&iev, 0, sizeof(iev));
  718         iev.iev_flags = c->ic_flags;
  719         iev.iev_freq = c->ic_freq;
  720         iev.iev_ieee = c->ic_ieee;
  721         CURVNET_SET(ifp->if_vnet);
  722         rt_ieee80211msg(ifp, RTM_IEEE80211_RADAR, &iev, sizeof(iev));
  723         CURVNET_RESTORE();
  724 }
  725 
  726 void
  727 ieee80211_notify_cac(struct ieee80211com *ic,
  728         const struct ieee80211_channel *c, enum ieee80211_notify_cac_event type)
  729 {
  730         struct ifnet *ifp = ic->ic_ifp;
  731         struct ieee80211_cac_event iev;
  732 
  733         memset(&iev, 0, sizeof(iev));
  734         iev.iev_flags = c->ic_flags;
  735         iev.iev_freq = c->ic_freq;
  736         iev.iev_ieee = c->ic_ieee;
  737         iev.iev_type = type;
  738         CURVNET_SET(ifp->if_vnet);
  739         rt_ieee80211msg(ifp, RTM_IEEE80211_CAC, &iev, sizeof(iev));
  740         CURVNET_RESTORE();
  741 }
  742 
  743 void
  744 ieee80211_notify_node_deauth(struct ieee80211_node *ni)
  745 {
  746         struct ieee80211vap *vap = ni->ni_vap;
  747         struct ifnet *ifp = vap->iv_ifp;
  748 
  749         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%s", "node deauth");
  750 
  751         notify_macaddr(ifp, RTM_IEEE80211_DEAUTH, ni->ni_macaddr);
  752 }
  753 
  754 void
  755 ieee80211_notify_node_auth(struct ieee80211_node *ni)
  756 {
  757         struct ieee80211vap *vap = ni->ni_vap;
  758         struct ifnet *ifp = vap->iv_ifp;
  759 
  760         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%s", "node auth");
  761 
  762         notify_macaddr(ifp, RTM_IEEE80211_AUTH, ni->ni_macaddr);
  763 }
  764 
  765 void
  766 ieee80211_notify_country(struct ieee80211vap *vap,
  767         const uint8_t bssid[IEEE80211_ADDR_LEN], const uint8_t cc[2])
  768 {
  769         struct ifnet *ifp = vap->iv_ifp;
  770         struct ieee80211_country_event iev;
  771 
  772         memset(&iev, 0, sizeof(iev));
  773         IEEE80211_ADDR_COPY(iev.iev_addr, bssid);
  774         iev.iev_cc[0] = cc[0];
  775         iev.iev_cc[1] = cc[1];
  776         CURVNET_SET(ifp->if_vnet);
  777         rt_ieee80211msg(ifp, RTM_IEEE80211_COUNTRY, &iev, sizeof(iev));
  778         CURVNET_RESTORE();
  779 }
  780 
  781 void
  782 ieee80211_notify_radio(struct ieee80211com *ic, int state)
  783 {
  784         struct ifnet *ifp = ic->ic_ifp;
  785         struct ieee80211_radio_event iev;
  786 
  787         memset(&iev, 0, sizeof(iev));
  788         iev.iev_state = state;
  789         CURVNET_SET(ifp->if_vnet);
  790         rt_ieee80211msg(ifp, RTM_IEEE80211_RADIO, &iev, sizeof(iev));
  791         CURVNET_RESTORE();
  792 }
  793 
  794 void
  795 ieee80211_load_module(const char *modname)
  796 {
  797 
  798 #ifdef notyet
  799         (void)kern_kldload(curthread, modname, NULL);
  800 #else
  801         printf("%s: load the %s module by hand for now.\n", __func__, modname);
  802 #endif
  803 }
  804 
  805 static eventhandler_tag wlan_bpfevent;
  806 static eventhandler_tag wlan_ifllevent;
  807 
  808 static void
  809 bpf_track(void *arg, struct ifnet *ifp, int dlt, int attach)
  810 {
  811         /* NB: identify vap's by if_init */
  812         if (dlt == DLT_IEEE802_11_RADIO &&
  813             ifp->if_init == ieee80211_init) {
  814                 struct ieee80211vap *vap = ifp->if_softc;
  815                 /*
  816                  * Track bpf radiotap listener state.  We mark the vap
  817                  * to indicate if any listener is present and the com
  818                  * to indicate if any listener exists on any associated
  819                  * vap.  This flag is used by drivers to prepare radiotap
  820                  * state only when needed.
  821                  */
  822                 if (attach) {
  823                         ieee80211_syncflag_ext(vap, IEEE80211_FEXT_BPF);
  824                         if (vap->iv_opmode == IEEE80211_M_MONITOR)
  825                                 atomic_add_int(&vap->iv_ic->ic_montaps, 1);
  826                 } else if (!bpf_peers_present(vap->iv_rawbpf)) {
  827                         ieee80211_syncflag_ext(vap, -IEEE80211_FEXT_BPF);
  828                         if (vap->iv_opmode == IEEE80211_M_MONITOR)
  829                                 atomic_subtract_int(&vap->iv_ic->ic_montaps, 1);
  830                 }
  831         }
  832 }
  833 
  834 static void
  835 wlan_iflladdr(void *arg __unused, struct ifnet *ifp)
  836 {
  837         struct ieee80211com *ic = ifp->if_l2com;
  838         struct ieee80211vap *vap, *next;
  839 
  840         if (ifp->if_type != IFT_IEEE80211 || ic == NULL)
  841                 return;
  842 
  843         IEEE80211_LOCK(ic);
  844         TAILQ_FOREACH_SAFE(vap, &ic->ic_vaps, iv_next, next) {
  845                 /*
  846                  * If the MAC address has changed on the parent and it was
  847                  * copied to the vap on creation then re-sync.
  848                  */
  849                 if (vap->iv_ic == ic &&
  850                     (vap->iv_flags_ext & IEEE80211_FEXT_UNIQMAC) == 0) {
  851                         IEEE80211_ADDR_COPY(vap->iv_myaddr, IF_LLADDR(ifp));
  852                         IEEE80211_UNLOCK(ic);
  853                         if_setlladdr(vap->iv_ifp, IF_LLADDR(ifp),
  854                             IEEE80211_ADDR_LEN);
  855                         IEEE80211_LOCK(ic);
  856                 }
  857         }
  858         IEEE80211_UNLOCK(ic);
  859 }
  860 
  861 /*
  862  * Module glue.
  863  *
  864  * NB: the module name is "wlan" for compatibility with NetBSD.
  865  */
  866 static int
  867 wlan_modevent(module_t mod, int type, void *unused)
  868 {
  869         switch (type) {
  870         case MOD_LOAD:
  871                 if (bootverbose)
  872                         printf("wlan: <802.11 Link Layer>\n");
  873                 wlan_bpfevent = EVENTHANDLER_REGISTER(bpf_track,
  874                     bpf_track, 0, EVENTHANDLER_PRI_ANY);
  875                 if (wlan_bpfevent == NULL)
  876                         return ENOMEM;
  877                 wlan_ifllevent = EVENTHANDLER_REGISTER(iflladdr_event,
  878                     wlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
  879                 if (wlan_ifllevent == NULL) {
  880                         EVENTHANDLER_DEREGISTER(bpf_track, wlan_bpfevent);
  881                         return ENOMEM;
  882                 }
  883 #if __FreeBSD_version >= 1000020
  884                 wlan_cloner = if_clone_simple(wlanname, wlan_clone_create,
  885                     wlan_clone_destroy, 0);
  886 #else
  887                 if_clone_attach(&wlan_cloner);
  888 #endif
  889                 if_register_com_alloc(IFT_IEEE80211, wlan_alloc, wlan_free);
  890                 return 0;
  891         case MOD_UNLOAD:
  892                 if_deregister_com_alloc(IFT_IEEE80211);
  893 #if __FreeBSD_version >= 1000020
  894                 if_clone_detach(wlan_cloner);
  895 #else
  896                 if_clone_detach(&wlan_cloner);
  897 #endif
  898                 EVENTHANDLER_DEREGISTER(bpf_track, wlan_bpfevent);
  899                 EVENTHANDLER_DEREGISTER(iflladdr_event, wlan_ifllevent);
  900                 return 0;
  901         }
  902         return EINVAL;
  903 }
  904 
  905 static moduledata_t wlan_mod = {
  906 #if __FreeBSD_version >= 1000020
  907         wlanname,
  908 #else
  909         "wlan",
  910 #endif
  911         wlan_modevent,
  912         0
  913 };
  914 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  915 MODULE_VERSION(wlan, 1);
  916 MODULE_DEPEND(wlan, ether, 1, 1, 1);
  917 #ifdef  IEEE80211_ALQ
  918 MODULE_DEPEND(wlan, alq, 1, 1, 1);
  919 #endif  /* IEEE80211_ALQ */
  920 

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