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/11.0/sys/net80211/ieee80211_freebsd.c 300232 2016-05-19 21:08:33Z avos $");
   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/systm.h> 
   36 #include <sys/eventhandler.h>
   37 #include <sys/kernel.h>
   38 #include <sys/linker.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mbuf.h>   
   41 #include <sys/module.h>
   42 #include <sys/proc.h>
   43 #include <sys/sysctl.h>
   44 
   45 #include <sys/socket.h>
   46 
   47 #include <net/bpf.h>
   48 #include <net/if.h>
   49 #include <net/if_var.h>
   50 #include <net/if_dl.h>
   51 #include <net/if_clone.h>
   52 #include <net/if_media.h>
   53 #include <net/if_types.h>
   54 #include <net/ethernet.h>
   55 #include <net/route.h>
   56 #include <net/vnet.h>
   57 
   58 #include <net80211/ieee80211_var.h>
   59 #include <net80211/ieee80211_input.h>
   60 
   61 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters");
   62 
   63 #ifdef IEEE80211_DEBUG
   64 static int      ieee80211_debug = 0;
   65 SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug,
   66             0, "debugging printfs");
   67 #endif
   68 
   69 static MALLOC_DEFINE(M_80211_COM, "80211com", "802.11 com state");
   70 
   71 static const char wlanname[] = "wlan";
   72 static struct if_clone *wlan_cloner;
   73 
   74 static int
   75 wlan_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   76 {
   77         struct ieee80211_clone_params cp;
   78         struct ieee80211vap *vap;
   79         struct ieee80211com *ic;
   80         int error;
   81 
   82         error = copyin(params, &cp, sizeof(cp));
   83         if (error)
   84                 return error;
   85         ic = ieee80211_find_com(cp.icp_parent);
   86         if (ic == NULL)
   87                 return ENXIO;
   88         if (cp.icp_opmode >= IEEE80211_OPMODE_MAX) {
   89                 ic_printf(ic, "%s: invalid opmode %d\n", __func__,
   90                     cp.icp_opmode);
   91                 return EINVAL;
   92         }
   93         if ((ic->ic_caps & ieee80211_opcap[cp.icp_opmode]) == 0) {
   94                 ic_printf(ic, "%s mode not supported\n",
   95                     ieee80211_opmode_name[cp.icp_opmode]);
   96                 return EOPNOTSUPP;
   97         }
   98         if ((cp.icp_flags & IEEE80211_CLONE_TDMA) &&
   99 #ifdef IEEE80211_SUPPORT_TDMA
  100             (ic->ic_caps & IEEE80211_C_TDMA) == 0
  101 #else
  102             (1)
  103 #endif
  104         ) {
  105                 ic_printf(ic, "TDMA not supported\n");
  106                 return EOPNOTSUPP;
  107         }
  108         vap = ic->ic_vap_create(ic, wlanname, unit,
  109                         cp.icp_opmode, cp.icp_flags, cp.icp_bssid,
  110                         cp.icp_flags & IEEE80211_CLONE_MACADDR ?
  111                             cp.icp_macaddr : ic->ic_macaddr);
  112 
  113         return (vap == NULL ? EIO : 0);
  114 }
  115 
  116 static void
  117 wlan_clone_destroy(struct ifnet *ifp)
  118 {
  119         struct ieee80211vap *vap = ifp->if_softc;
  120         struct ieee80211com *ic = vap->iv_ic;
  121 
  122         ic->ic_vap_delete(vap);
  123 }
  124 
  125 void
  126 ieee80211_vap_destroy(struct ieee80211vap *vap)
  127 {
  128         CURVNET_SET(vap->iv_ifp->if_vnet);
  129         if_clone_destroyif(wlan_cloner, vap->iv_ifp);
  130         CURVNET_RESTORE();
  131 }
  132 
  133 int
  134 ieee80211_sysctl_msecs_ticks(SYSCTL_HANDLER_ARGS)
  135 {
  136         int msecs = ticks_to_msecs(*(int *)arg1);
  137         int error, t;
  138 
  139         error = sysctl_handle_int(oidp, &msecs, 0, req);
  140         if (error || !req->newptr)
  141                 return error;
  142         t = msecs_to_ticks(msecs);
  143         *(int *)arg1 = (t < 1) ? 1 : t;
  144         return 0;
  145 }
  146 
  147 static int
  148 ieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS)
  149 {
  150         int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT;
  151         int error;
  152 
  153         error = sysctl_handle_int(oidp, &inact, 0, req);
  154         if (error || !req->newptr)
  155                 return error;
  156         *(int *)arg1 = inact / IEEE80211_INACT_WAIT;
  157         return 0;
  158 }
  159 
  160 static int
  161 ieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS)
  162 {
  163         struct ieee80211com *ic = arg1;
  164 
  165         return SYSCTL_OUT_STR(req, ic->ic_name);
  166 }
  167 
  168 static int
  169 ieee80211_sysctl_radar(SYSCTL_HANDLER_ARGS)
  170 {
  171         struct ieee80211com *ic = arg1;
  172         int t = 0, error;
  173 
  174         error = sysctl_handle_int(oidp, &t, 0, req);
  175         if (error || !req->newptr)
  176                 return error;
  177         IEEE80211_LOCK(ic);
  178         ieee80211_dfs_notify_radar(ic, ic->ic_curchan);
  179         IEEE80211_UNLOCK(ic);
  180         return 0;
  181 }
  182 
  183 void
  184 ieee80211_sysctl_attach(struct ieee80211com *ic)
  185 {
  186 }
  187 
  188 void
  189 ieee80211_sysctl_detach(struct ieee80211com *ic)
  190 {
  191 }
  192 
  193 void
  194 ieee80211_sysctl_vattach(struct ieee80211vap *vap)
  195 {
  196         struct ifnet *ifp = vap->iv_ifp;
  197         struct sysctl_ctx_list *ctx;
  198         struct sysctl_oid *oid;
  199         char num[14];                   /* sufficient for 32 bits */
  200 
  201         ctx = (struct sysctl_ctx_list *) IEEE80211_MALLOC(sizeof(struct sysctl_ctx_list),
  202                 M_DEVBUF, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  203         if (ctx == NULL) {
  204                 if_printf(ifp, "%s: cannot allocate sysctl context!\n",
  205                         __func__);
  206                 return;
  207         }
  208         sysctl_ctx_init(ctx);
  209         snprintf(num, sizeof(num), "%u", ifp->if_dunit);
  210         oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan),
  211                 OID_AUTO, num, CTLFLAG_RD, NULL, "");
  212         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  213                 "%parent", CTLTYPE_STRING | CTLFLAG_RD, vap->iv_ic, 0,
  214                 ieee80211_sysctl_parent, "A", "parent device");
  215         SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  216                 "driver_caps", CTLFLAG_RW, &vap->iv_caps, 0,
  217                 "driver capabilities");
  218 #ifdef IEEE80211_DEBUG
  219         vap->iv_debug = ieee80211_debug;
  220         SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  221                 "debug", CTLFLAG_RW, &vap->iv_debug, 0,
  222                 "control debugging printfs");
  223 #endif
  224         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  225                 "bmiss_max", CTLFLAG_RW, &vap->iv_bmiss_max, 0,
  226                 "consecutive beacon misses before scanning");
  227         /* XXX inherit from tunables */
  228         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  229                 "inact_run", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_run, 0,
  230                 ieee80211_sysctl_inact, "I",
  231                 "station inactivity timeout (sec)");
  232         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  233                 "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_probe, 0,
  234                 ieee80211_sysctl_inact, "I",
  235                 "station inactivity probe timeout (sec)");
  236         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  237                 "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_auth, 0,
  238                 ieee80211_sysctl_inact, "I",
  239                 "station authentication timeout (sec)");
  240         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  241                 "inact_init", CTLTYPE_INT | CTLFLAG_RW, &vap->iv_inact_init, 0,
  242                 ieee80211_sysctl_inact, "I",
  243                 "station initial state timeout (sec)");
  244         if (vap->iv_htcaps & IEEE80211_HTC_HT) {
  245                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  246                         "ampdu_mintraffic_bk", CTLFLAG_RW,
  247                         &vap->iv_ampdu_mintraffic[WME_AC_BK], 0,
  248                         "BK traffic tx aggr threshold (pps)");
  249                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  250                         "ampdu_mintraffic_be", CTLFLAG_RW,
  251                         &vap->iv_ampdu_mintraffic[WME_AC_BE], 0,
  252                         "BE traffic tx aggr threshold (pps)");
  253                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  254                         "ampdu_mintraffic_vo", CTLFLAG_RW,
  255                         &vap->iv_ampdu_mintraffic[WME_AC_VO], 0,
  256                         "VO traffic tx aggr threshold (pps)");
  257                 SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  258                         "ampdu_mintraffic_vi", CTLFLAG_RW,
  259                         &vap->iv_ampdu_mintraffic[WME_AC_VI], 0,
  260                         "VI traffic tx aggr threshold (pps)");
  261         }
  262         if (vap->iv_caps & IEEE80211_C_DFS) {
  263                 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  264                         "radar", CTLTYPE_INT | CTLFLAG_RW, vap->iv_ic, 0,
  265                         ieee80211_sysctl_radar, "I", "simulate radar event");
  266         }
  267         vap->iv_sysctl = ctx;
  268         vap->iv_oid = oid;
  269 }
  270 
  271 void
  272 ieee80211_sysctl_vdetach(struct ieee80211vap *vap)
  273 {
  274 
  275         if (vap->iv_sysctl != NULL) {
  276                 sysctl_ctx_free(vap->iv_sysctl);
  277                 IEEE80211_FREE(vap->iv_sysctl, M_DEVBUF);
  278                 vap->iv_sysctl = NULL;
  279         }
  280 }
  281 
  282 int
  283 ieee80211_node_dectestref(struct ieee80211_node *ni)
  284 {
  285         /* XXX need equivalent of atomic_dec_and_test */
  286         atomic_subtract_int(&ni->ni_refcnt, 1);
  287         return atomic_cmpset_int(&ni->ni_refcnt, 0, 1);
  288 }
  289 
  290 void
  291 ieee80211_drain_ifq(struct ifqueue *ifq)
  292 {
  293         struct ieee80211_node *ni;
  294         struct mbuf *m;
  295 
  296         for (;;) {
  297                 IF_DEQUEUE(ifq, m);
  298                 if (m == NULL)
  299                         break;
  300 
  301                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  302                 KASSERT(ni != NULL, ("frame w/o node"));
  303                 ieee80211_free_node(ni);
  304                 m->m_pkthdr.rcvif = NULL;
  305 
  306                 m_freem(m);
  307         }
  308 }
  309 
  310 void
  311 ieee80211_flush_ifq(struct ifqueue *ifq, struct ieee80211vap *vap)
  312 {
  313         struct ieee80211_node *ni;
  314         struct mbuf *m, **mprev;
  315 
  316         IF_LOCK(ifq);
  317         mprev = &ifq->ifq_head;
  318         while ((m = *mprev) != NULL) {
  319                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  320                 if (ni != NULL && ni->ni_vap == vap) {
  321                         *mprev = m->m_nextpkt;          /* remove from list */
  322                         ifq->ifq_len--;
  323 
  324                         m_freem(m);
  325                         ieee80211_free_node(ni);        /* reclaim ref */
  326                 } else
  327                         mprev = &m->m_nextpkt;
  328         }
  329         /* recalculate tail ptr */
  330         m = ifq->ifq_head;
  331         for (; m != NULL && m->m_nextpkt != NULL; m = m->m_nextpkt)
  332                 ;
  333         ifq->ifq_tail = m;
  334         IF_UNLOCK(ifq);
  335 }
  336 
  337 /*
  338  * As above, for mbufs allocated with m_gethdr/MGETHDR
  339  * or initialized by M_COPY_PKTHDR.
  340  */
  341 #define MC_ALIGN(m, len)                                                \
  342 do {                                                                    \
  343         (m)->m_data += rounddown2(MCLBYTES - (len), sizeof(long));      \
  344 } while (/* CONSTCOND */ 0)
  345 
  346 /*
  347  * Allocate and setup a management frame of the specified
  348  * size.  We return the mbuf and a pointer to the start
  349  * of the contiguous data area that's been reserved based
  350  * on the packet length.  The data area is forced to 32-bit
  351  * alignment and the buffer length to a multiple of 4 bytes.
  352  * This is done mainly so beacon frames (that require this)
  353  * can use this interface too.
  354  */
  355 struct mbuf *
  356 ieee80211_getmgtframe(uint8_t **frm, int headroom, int pktlen)
  357 {
  358         struct mbuf *m;
  359         u_int len;
  360 
  361         /*
  362          * NB: we know the mbuf routines will align the data area
  363          *     so we don't need to do anything special.
  364          */
  365         len = roundup2(headroom + pktlen, 4);
  366         KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
  367         if (len < MINCLSIZE) {
  368                 m = m_gethdr(M_NOWAIT, MT_DATA);
  369                 /*
  370                  * Align the data in case additional headers are added.
  371                  * This should only happen when a WEP header is added
  372                  * which only happens for shared key authentication mgt
  373                  * frames which all fit in MHLEN.
  374                  */
  375                 if (m != NULL)
  376                         M_ALIGN(m, len);
  377         } else {
  378                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
  379                 if (m != NULL)
  380                         MC_ALIGN(m, len);
  381         }
  382         if (m != NULL) {
  383                 m->m_data += headroom;
  384                 *frm = m->m_data;
  385         }
  386         return m;
  387 }
  388 
  389 #ifndef __NO_STRICT_ALIGNMENT
  390 /*
  391  * Re-align the payload in the mbuf.  This is mainly used (right now)
  392  * to handle IP header alignment requirements on certain architectures.
  393  */
  394 struct mbuf *
  395 ieee80211_realign(struct ieee80211vap *vap, struct mbuf *m, size_t align)
  396 {
  397         int pktlen, space;
  398         struct mbuf *n;
  399 
  400         pktlen = m->m_pkthdr.len;
  401         space = pktlen + align;
  402         if (space < MINCLSIZE)
  403                 n = m_gethdr(M_NOWAIT, MT_DATA);
  404         else {
  405                 n = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR,
  406                     space <= MCLBYTES ?     MCLBYTES :
  407 #if MJUMPAGESIZE != MCLBYTES
  408                     space <= MJUMPAGESIZE ? MJUMPAGESIZE :
  409 #endif
  410                     space <= MJUM9BYTES ?   MJUM9BYTES : MJUM16BYTES);
  411         }
  412         if (__predict_true(n != NULL)) {
  413                 m_move_pkthdr(n, m);
  414                 n->m_data = (caddr_t)(ALIGN(n->m_data + align) - align);
  415                 m_copydata(m, 0, pktlen, mtod(n, caddr_t));
  416                 n->m_len = pktlen;
  417         } else {
  418                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  419                     mtod(m, const struct ieee80211_frame *), NULL,
  420                     "%s", "no mbuf to realign");
  421                 vap->iv_stats.is_rx_badalign++;
  422         }
  423         m_freem(m);
  424         return n;
  425 }
  426 #endif /* !__NO_STRICT_ALIGNMENT */
  427 
  428 int
  429 ieee80211_add_callback(struct mbuf *m,
  430         void (*func)(struct ieee80211_node *, void *, int), void *arg)
  431 {
  432         struct m_tag *mtag;
  433         struct ieee80211_cb *cb;
  434 
  435         mtag = m_tag_alloc(MTAG_ABI_NET80211, NET80211_TAG_CALLBACK,
  436                         sizeof(struct ieee80211_cb), M_NOWAIT);
  437         if (mtag == NULL)
  438                 return 0;
  439 
  440         cb = (struct ieee80211_cb *)(mtag+1);
  441         cb->func = func;
  442         cb->arg = arg;
  443         m_tag_prepend(m, mtag);
  444         m->m_flags |= M_TXCB;
  445         return 1;
  446 }
  447 
  448 int
  449 ieee80211_add_xmit_params(struct mbuf *m,
  450     const struct ieee80211_bpf_params *params)
  451 {
  452         struct m_tag *mtag;
  453         struct ieee80211_tx_params *tx;
  454 
  455         mtag = m_tag_alloc(MTAG_ABI_NET80211, NET80211_TAG_XMIT_PARAMS,
  456             sizeof(struct ieee80211_tx_params), M_NOWAIT);
  457         if (mtag == NULL)
  458                 return (0);
  459 
  460         tx = (struct ieee80211_tx_params *)(mtag+1);
  461         memcpy(&tx->params, params, sizeof(struct ieee80211_bpf_params));
  462         m_tag_prepend(m, mtag);
  463         return (1);
  464 }
  465 
  466 int
  467 ieee80211_get_xmit_params(struct mbuf *m,
  468     struct ieee80211_bpf_params *params)
  469 {
  470         struct m_tag *mtag;
  471         struct ieee80211_tx_params *tx;
  472 
  473         mtag = m_tag_locate(m, MTAG_ABI_NET80211, NET80211_TAG_XMIT_PARAMS,
  474             NULL);
  475         if (mtag == NULL)
  476                 return (-1);
  477         tx = (struct ieee80211_tx_params *)(mtag + 1);
  478         memcpy(params, &tx->params, sizeof(struct ieee80211_bpf_params));
  479         return (0);
  480 }
  481 
  482 void
  483 ieee80211_process_callback(struct ieee80211_node *ni,
  484         struct mbuf *m, int status)
  485 {
  486         struct m_tag *mtag;
  487 
  488         mtag = m_tag_locate(m, MTAG_ABI_NET80211, NET80211_TAG_CALLBACK, NULL);
  489         if (mtag != NULL) {
  490                 struct ieee80211_cb *cb = (struct ieee80211_cb *)(mtag+1);
  491                 cb->func(ni, cb->arg, status);
  492         }
  493 }
  494 
  495 /*
  496  * Add RX parameters to the given mbuf.
  497  *
  498  * Returns 1 if OK, 0 on error.
  499  */
  500 int
  501 ieee80211_add_rx_params(struct mbuf *m, const struct ieee80211_rx_stats *rxs)
  502 {
  503         struct m_tag *mtag;
  504         struct ieee80211_rx_params *rx;
  505 
  506         mtag = m_tag_alloc(MTAG_ABI_NET80211, NET80211_TAG_RECV_PARAMS,
  507             sizeof(struct ieee80211_rx_stats), M_NOWAIT);
  508         if (mtag == NULL)
  509                 return (0);
  510 
  511         rx = (struct ieee80211_rx_params *)(mtag + 1);
  512         memcpy(&rx->params, rxs, sizeof(*rxs));
  513         m_tag_prepend(m, mtag);
  514         return (1);
  515 }
  516 
  517 int
  518 ieee80211_get_rx_params(struct mbuf *m, struct ieee80211_rx_stats *rxs)
  519 {
  520         struct m_tag *mtag;
  521         struct ieee80211_rx_params *rx;
  522 
  523         mtag = m_tag_locate(m, MTAG_ABI_NET80211, NET80211_TAG_RECV_PARAMS,
  524             NULL);
  525         if (mtag == NULL)
  526                 return (-1);
  527         rx = (struct ieee80211_rx_params *)(mtag + 1);
  528         memcpy(rxs, &rx->params, sizeof(*rxs));
  529         return (0);
  530 }
  531 
  532 /*
  533  * Transmit a frame to the parent interface.
  534  */
  535 int
  536 ieee80211_parent_xmitpkt(struct ieee80211com *ic, struct mbuf *m)
  537 {
  538         int error;
  539 
  540         /*
  541          * Assert the IC TX lock is held - this enforces the
  542          * processing -> queuing order is maintained
  543          */
  544         IEEE80211_TX_LOCK_ASSERT(ic);
  545         error = ic->ic_transmit(ic, m);
  546         if (error) {
  547                 struct ieee80211_node *ni;
  548 
  549                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  550 
  551                 /* XXX number of fragments */
  552                 if_inc_counter(ni->ni_vap->iv_ifp, IFCOUNTER_OERRORS, 1);
  553                 ieee80211_free_node(ni);
  554                 ieee80211_free_mbuf(m);
  555         }
  556         return (error);
  557 }
  558 
  559 /*
  560  * Transmit a frame to the VAP interface.
  561  */
  562 int
  563 ieee80211_vap_xmitpkt(struct ieee80211vap *vap, struct mbuf *m)
  564 {
  565         struct ifnet *ifp = vap->iv_ifp;
  566 
  567         /*
  568          * When transmitting via the VAP, we shouldn't hold
  569          * any IC TX lock as the VAP TX path will acquire it.
  570          */
  571         IEEE80211_TX_UNLOCK_ASSERT(vap->iv_ic);
  572 
  573         return (ifp->if_transmit(ifp, m));
  574 
  575 }
  576 
  577 #include <sys/libkern.h>
  578 
  579 void
  580 get_random_bytes(void *p, size_t n)
  581 {
  582         uint8_t *dp = p;
  583 
  584         while (n > 0) {
  585                 uint32_t v = arc4random();
  586                 size_t nb = n > sizeof(uint32_t) ? sizeof(uint32_t) : n;
  587                 bcopy(&v, dp, n > sizeof(uint32_t) ? sizeof(uint32_t) : n);
  588                 dp += sizeof(uint32_t), n -= nb;
  589         }
  590 }
  591 
  592 /*
  593  * Helper function for events that pass just a single mac address.
  594  */
  595 static void
  596 notify_macaddr(struct ifnet *ifp, int op, const uint8_t mac[IEEE80211_ADDR_LEN])
  597 {
  598         struct ieee80211_join_event iev;
  599 
  600         CURVNET_SET(ifp->if_vnet);
  601         memset(&iev, 0, sizeof(iev));
  602         IEEE80211_ADDR_COPY(iev.iev_addr, mac);
  603         rt_ieee80211msg(ifp, op, &iev, sizeof(iev));
  604         CURVNET_RESTORE();
  605 }
  606 
  607 void
  608 ieee80211_notify_node_join(struct ieee80211_node *ni, int newassoc)
  609 {
  610         struct ieee80211vap *vap = ni->ni_vap;
  611         struct ifnet *ifp = vap->iv_ifp;
  612 
  613         CURVNET_SET_QUIET(ifp->if_vnet);
  614         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%snode join",
  615             (ni == vap->iv_bss) ? "bss " : "");
  616 
  617         if (ni == vap->iv_bss) {
  618                 notify_macaddr(ifp, newassoc ?
  619                     RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, ni->ni_bssid);
  620                 if_link_state_change(ifp, LINK_STATE_UP);
  621         } else {
  622                 notify_macaddr(ifp, newassoc ?
  623                     RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN, ni->ni_macaddr);
  624         }
  625         CURVNET_RESTORE();
  626 }
  627 
  628 void
  629 ieee80211_notify_node_leave(struct ieee80211_node *ni)
  630 {
  631         struct ieee80211vap *vap = ni->ni_vap;
  632         struct ifnet *ifp = vap->iv_ifp;
  633 
  634         CURVNET_SET_QUIET(ifp->if_vnet);
  635         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%snode leave",
  636             (ni == vap->iv_bss) ? "bss " : "");
  637 
  638         if (ni == vap->iv_bss) {
  639                 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
  640                 if_link_state_change(ifp, LINK_STATE_DOWN);
  641         } else {
  642                 /* fire off wireless event station leaving */
  643                 notify_macaddr(ifp, RTM_IEEE80211_LEAVE, ni->ni_macaddr);
  644         }
  645         CURVNET_RESTORE();
  646 }
  647 
  648 void
  649 ieee80211_notify_scan_done(struct ieee80211vap *vap)
  650 {
  651         struct ifnet *ifp = vap->iv_ifp;
  652 
  653         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n", "notify scan done");
  654 
  655         /* dispatch wireless event indicating scan completed */
  656         CURVNET_SET(ifp->if_vnet);
  657         rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
  658         CURVNET_RESTORE();
  659 }
  660 
  661 void
  662 ieee80211_notify_replay_failure(struct ieee80211vap *vap,
  663         const struct ieee80211_frame *wh, const struct ieee80211_key *k,
  664         u_int64_t rsc, int tid)
  665 {
  666         struct ifnet *ifp = vap->iv_ifp;
  667 
  668         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  669             "%s replay detected tid %d <rsc %ju, csc %ju, keyix %u rxkeyix %u>",
  670             k->wk_cipher->ic_name, tid, (intmax_t) rsc,
  671             (intmax_t) k->wk_keyrsc[tid],
  672             k->wk_keyix, k->wk_rxkeyix);
  673 
  674         if (ifp != NULL) {              /* NB: for cipher test modules */
  675                 struct ieee80211_replay_event iev;
  676 
  677                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  678                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  679                 iev.iev_cipher = k->wk_cipher->ic_cipher;
  680                 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE)
  681                         iev.iev_keyix = k->wk_rxkeyix;
  682                 else
  683                         iev.iev_keyix = k->wk_keyix;
  684                 iev.iev_keyrsc = k->wk_keyrsc[tid];
  685                 iev.iev_rsc = rsc;
  686                 CURVNET_SET(ifp->if_vnet);
  687                 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
  688                 CURVNET_RESTORE();
  689         }
  690 }
  691 
  692 void
  693 ieee80211_notify_michael_failure(struct ieee80211vap *vap,
  694         const struct ieee80211_frame *wh, u_int keyix)
  695 {
  696         struct ifnet *ifp = vap->iv_ifp;
  697 
  698         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
  699             "michael MIC verification failed <keyix %u>", keyix);
  700         vap->iv_stats.is_rx_tkipmic++;
  701 
  702         if (ifp != NULL) {              /* NB: for cipher test modules */
  703                 struct ieee80211_michael_event iev;
  704 
  705                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  706                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  707                 iev.iev_cipher = IEEE80211_CIPHER_TKIP;
  708                 iev.iev_keyix = keyix;
  709                 CURVNET_SET(ifp->if_vnet);
  710                 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
  711                 CURVNET_RESTORE();
  712         }
  713 }
  714 
  715 void
  716 ieee80211_notify_wds_discover(struct ieee80211_node *ni)
  717 {
  718         struct ieee80211vap *vap = ni->ni_vap;
  719         struct ifnet *ifp = vap->iv_ifp;
  720 
  721         notify_macaddr(ifp, RTM_IEEE80211_WDS, ni->ni_macaddr);
  722 }
  723 
  724 void
  725 ieee80211_notify_csa(struct ieee80211com *ic,
  726         const struct ieee80211_channel *c, int mode, int count)
  727 {
  728         struct ieee80211_csa_event iev;
  729         struct ieee80211vap *vap;
  730         struct ifnet *ifp;
  731 
  732         memset(&iev, 0, sizeof(iev));
  733         iev.iev_flags = c->ic_flags;
  734         iev.iev_freq = c->ic_freq;
  735         iev.iev_ieee = c->ic_ieee;
  736         iev.iev_mode = mode;
  737         iev.iev_count = count;
  738         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  739                 ifp = vap->iv_ifp;
  740                 CURVNET_SET(ifp->if_vnet);
  741                 rt_ieee80211msg(ifp, RTM_IEEE80211_CSA, &iev, sizeof(iev));
  742                 CURVNET_RESTORE();
  743         }
  744 }
  745 
  746 void
  747 ieee80211_notify_radar(struct ieee80211com *ic,
  748         const struct ieee80211_channel *c)
  749 {
  750         struct ieee80211_radar_event iev;
  751         struct ieee80211vap *vap;
  752         struct ifnet *ifp;
  753 
  754         memset(&iev, 0, sizeof(iev));
  755         iev.iev_flags = c->ic_flags;
  756         iev.iev_freq = c->ic_freq;
  757         iev.iev_ieee = c->ic_ieee;
  758         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  759                 ifp = vap->iv_ifp;
  760                 CURVNET_SET(ifp->if_vnet);
  761                 rt_ieee80211msg(ifp, RTM_IEEE80211_RADAR, &iev, sizeof(iev));
  762                 CURVNET_RESTORE();
  763         }
  764 }
  765 
  766 void
  767 ieee80211_notify_cac(struct ieee80211com *ic,
  768         const struct ieee80211_channel *c, enum ieee80211_notify_cac_event type)
  769 {
  770         struct ieee80211_cac_event iev;
  771         struct ieee80211vap *vap;
  772         struct ifnet *ifp;
  773 
  774         memset(&iev, 0, sizeof(iev));
  775         iev.iev_flags = c->ic_flags;
  776         iev.iev_freq = c->ic_freq;
  777         iev.iev_ieee = c->ic_ieee;
  778         iev.iev_type = type;
  779         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  780                 ifp = vap->iv_ifp;
  781                 CURVNET_SET(ifp->if_vnet);
  782                 rt_ieee80211msg(ifp, RTM_IEEE80211_CAC, &iev, sizeof(iev));
  783                 CURVNET_RESTORE();
  784         }
  785 }
  786 
  787 void
  788 ieee80211_notify_node_deauth(struct ieee80211_node *ni)
  789 {
  790         struct ieee80211vap *vap = ni->ni_vap;
  791         struct ifnet *ifp = vap->iv_ifp;
  792 
  793         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%s", "node deauth");
  794 
  795         notify_macaddr(ifp, RTM_IEEE80211_DEAUTH, ni->ni_macaddr);
  796 }
  797 
  798 void
  799 ieee80211_notify_node_auth(struct ieee80211_node *ni)
  800 {
  801         struct ieee80211vap *vap = ni->ni_vap;
  802         struct ifnet *ifp = vap->iv_ifp;
  803 
  804         IEEE80211_NOTE(vap, IEEE80211_MSG_NODE, ni, "%s", "node auth");
  805 
  806         notify_macaddr(ifp, RTM_IEEE80211_AUTH, ni->ni_macaddr);
  807 }
  808 
  809 void
  810 ieee80211_notify_country(struct ieee80211vap *vap,
  811         const uint8_t bssid[IEEE80211_ADDR_LEN], const uint8_t cc[2])
  812 {
  813         struct ifnet *ifp = vap->iv_ifp;
  814         struct ieee80211_country_event iev;
  815 
  816         memset(&iev, 0, sizeof(iev));
  817         IEEE80211_ADDR_COPY(iev.iev_addr, bssid);
  818         iev.iev_cc[0] = cc[0];
  819         iev.iev_cc[1] = cc[1];
  820         CURVNET_SET(ifp->if_vnet);
  821         rt_ieee80211msg(ifp, RTM_IEEE80211_COUNTRY, &iev, sizeof(iev));
  822         CURVNET_RESTORE();
  823 }
  824 
  825 void
  826 ieee80211_notify_radio(struct ieee80211com *ic, int state)
  827 {
  828         struct ieee80211_radio_event iev;
  829         struct ieee80211vap *vap;
  830         struct ifnet *ifp;
  831 
  832         memset(&iev, 0, sizeof(iev));
  833         iev.iev_state = state;
  834         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  835                 ifp = vap->iv_ifp;
  836                 CURVNET_SET(ifp->if_vnet);
  837                 rt_ieee80211msg(ifp, RTM_IEEE80211_RADIO, &iev, sizeof(iev));
  838                 CURVNET_RESTORE();
  839         }
  840 }
  841 
  842 void
  843 ieee80211_load_module(const char *modname)
  844 {
  845 
  846 #ifdef notyet
  847         (void)kern_kldload(curthread, modname, NULL);
  848 #else
  849         printf("%s: load the %s module by hand for now.\n", __func__, modname);
  850 #endif
  851 }
  852 
  853 static eventhandler_tag wlan_bpfevent;
  854 static eventhandler_tag wlan_ifllevent;
  855 
  856 static void
  857 bpf_track(void *arg, struct ifnet *ifp, int dlt, int attach)
  858 {
  859         /* NB: identify vap's by if_init */
  860         if (dlt == DLT_IEEE802_11_RADIO &&
  861             ifp->if_init == ieee80211_init) {
  862                 struct ieee80211vap *vap = ifp->if_softc;
  863                 /*
  864                  * Track bpf radiotap listener state.  We mark the vap
  865                  * to indicate if any listener is present and the com
  866                  * to indicate if any listener exists on any associated
  867                  * vap.  This flag is used by drivers to prepare radiotap
  868                  * state only when needed.
  869                  */
  870                 if (attach) {
  871                         ieee80211_syncflag_ext(vap, IEEE80211_FEXT_BPF);
  872                         if (vap->iv_opmode == IEEE80211_M_MONITOR)
  873                                 atomic_add_int(&vap->iv_ic->ic_montaps, 1);
  874                 } else if (!bpf_peers_present(vap->iv_rawbpf)) {
  875                         ieee80211_syncflag_ext(vap, -IEEE80211_FEXT_BPF);
  876                         if (vap->iv_opmode == IEEE80211_M_MONITOR)
  877                                 atomic_subtract_int(&vap->iv_ic->ic_montaps, 1);
  878                 }
  879         }
  880 }
  881 
  882 /*
  883  * Change MAC address on the vap (if was not started).
  884  */
  885 static void
  886 wlan_iflladdr(void *arg __unused, struct ifnet *ifp)
  887 {
  888         /* NB: identify vap's by if_init */
  889         if (ifp->if_init == ieee80211_init &&
  890             (ifp->if_flags & IFF_UP) == 0) {
  891                 struct ieee80211vap *vap = ifp->if_softc;
  892 
  893                 IEEE80211_ADDR_COPY(vap->iv_myaddr, IF_LLADDR(ifp));
  894         }
  895 }
  896 
  897 /*
  898  * Module glue.
  899  *
  900  * NB: the module name is "wlan" for compatibility with NetBSD.
  901  */
  902 static int
  903 wlan_modevent(module_t mod, int type, void *unused)
  904 {
  905         switch (type) {
  906         case MOD_LOAD:
  907                 if (bootverbose)
  908                         printf("wlan: <802.11 Link Layer>\n");
  909                 wlan_bpfevent = EVENTHANDLER_REGISTER(bpf_track,
  910                     bpf_track, 0, EVENTHANDLER_PRI_ANY);
  911                 wlan_ifllevent = EVENTHANDLER_REGISTER(iflladdr_event,
  912                     wlan_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
  913                 wlan_cloner = if_clone_simple(wlanname, wlan_clone_create,
  914                     wlan_clone_destroy, 0);
  915                 return 0;
  916         case MOD_UNLOAD:
  917                 if_clone_detach(wlan_cloner);
  918                 EVENTHANDLER_DEREGISTER(bpf_track, wlan_bpfevent);
  919                 EVENTHANDLER_DEREGISTER(iflladdr_event, wlan_ifllevent);
  920                 return 0;
  921         }
  922         return EINVAL;
  923 }
  924 
  925 static moduledata_t wlan_mod = {
  926         wlanname,
  927         wlan_modevent,
  928         0
  929 };
  930 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  931 MODULE_VERSION(wlan, 1);
  932 MODULE_DEPEND(wlan, ether, 1, 1, 1);
  933 #ifdef  IEEE80211_ALQ
  934 MODULE_DEPEND(wlan, alq, 1, 1, 1);
  935 #endif  /* IEEE80211_ALQ */
  936 

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