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) 2003-2005 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  * 3. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/6.3/sys/net80211/ieee80211_freebsd.c 167396 2007-03-10 00:31:03Z sam $");
   30 
   31 /*
   32  * IEEE 802.11 support (FreeBSD-specific code)
   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/if.h>
   46 #include <net/if_media.h>
   47 #include <net/ethernet.h>
   48 #include <net/route.h>
   49 
   50 #include <net80211/ieee80211_var.h>
   51 
   52 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters");
   53 
   54 #ifdef IEEE80211_DEBUG
   55 int     ieee80211_debug = 0;
   56 SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug,
   57             0, "debugging printfs");
   58 #endif
   59 
   60 static int
   61 ieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS)
   62 {
   63         int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT;
   64         int error;
   65 
   66         error = sysctl_handle_int(oidp, &inact, 0, req);
   67         if (error || !req->newptr)
   68                 return error;
   69         *(int *)arg1 = inact / IEEE80211_INACT_WAIT;
   70         return 0;
   71 }
   72 
   73 static int
   74 ieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS)
   75 {
   76         struct ieee80211com *ic = arg1;
   77         const char *name = ic->ic_ifp->if_xname;
   78 
   79         return SYSCTL_OUT(req, name, strlen(name));
   80 }
   81 
   82 void
   83 ieee80211_sysctl_attach(struct ieee80211com *ic)
   84 {
   85         struct sysctl_ctx_list *ctx;
   86         struct sysctl_oid *oid;
   87         char num[14];                   /* sufficient for 32 bits */
   88 
   89         MALLOC(ctx, struct sysctl_ctx_list *, sizeof(struct sysctl_ctx_list),
   90                 M_DEVBUF, M_NOWAIT | M_ZERO);
   91         if (ctx == NULL) {
   92                 if_printf(ic->ic_ifp, "%s: cannot allocate sysctl context!\n",
   93                         __func__);
   94                 return;
   95         }
   96         sysctl_ctx_init(ctx);
   97         snprintf(num, sizeof(num), "%u", ic->ic_vap);
   98         oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan),
   99                 OID_AUTO, num, CTLFLAG_RD, NULL, "");
  100         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  101                 "%parent", CTLFLAG_RD, ic, 0, ieee80211_sysctl_parent, "A",
  102                 "parent device");
  103 #ifdef IEEE80211_DEBUG
  104         ic->ic_debug = ieee80211_debug;
  105         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  106                 "debug", CTLFLAG_RW, &ic->ic_debug, 0,
  107                 "control debugging printfs");
  108 #endif
  109         /* XXX inherit from tunables */
  110         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  111                 "inact_run", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_run, 0,
  112                 ieee80211_sysctl_inact, "I",
  113                 "station inactivity timeout (sec)");
  114         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  115                 "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_probe, 0,
  116                 ieee80211_sysctl_inact, "I",
  117                 "station inactivity probe timeout (sec)");
  118         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  119                 "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_auth, 0,
  120                 ieee80211_sysctl_inact, "I",
  121                 "station authentication timeout (sec)");
  122         SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  123                 "inact_init", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_init, 0,
  124                 ieee80211_sysctl_inact, "I",
  125                 "station initial state timeout (sec)");
  126         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  127                 "driver_caps", CTLFLAG_RW, &ic->ic_caps, 0,
  128                 "driver capabilities");
  129         SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
  130                 "bmiss_max", CTLFLAG_RW, &ic->ic_bmiss_max, 0,
  131                 "consecutive beacon misses before scanning");
  132         ic->ic_sysctl = ctx;
  133 }
  134 
  135 void
  136 ieee80211_sysctl_detach(struct ieee80211com *ic)
  137 {
  138 
  139         if (ic->ic_sysctl != NULL) {
  140                 sysctl_ctx_free(ic->ic_sysctl);
  141                 ic->ic_sysctl = NULL;
  142         }
  143 }
  144 
  145 int
  146 ieee80211_node_dectestref(struct ieee80211_node *ni)
  147 {
  148         /* XXX need equivalent of atomic_dec_and_test */
  149         atomic_subtract_int(&ni->ni_refcnt, 1);
  150         return atomic_cmpset_int(&ni->ni_refcnt, 0, 1);
  151 }
  152 
  153 void
  154 ieee80211_drain_ifq(struct ifqueue *ifq)
  155 {
  156         struct ieee80211_node *ni;
  157         struct mbuf *m;
  158 
  159         for (;;) {
  160                 IF_DEQUEUE(ifq, m);
  161                 if (m == NULL)
  162                         break;
  163 
  164                 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif;
  165                 KASSERT(ni != NULL, ("frame w/o node"));
  166                 ieee80211_free_node(ni);
  167                 m->m_pkthdr.rcvif = NULL;
  168 
  169                 m_freem(m);
  170         }
  171 }
  172 
  173 /*
  174  * Allocate and setup a management frame of the specified
  175  * size.  We return the mbuf and a pointer to the start
  176  * of the contiguous data area that's been reserved based
  177  * on the packet length.  The data area is forced to 32-bit
  178  * alignment and the buffer length to a multiple of 4 bytes.
  179  * This is done mainly so beacon frames (that require this)
  180  * can use this interface too.
  181  */
  182 struct mbuf *
  183 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen)
  184 {
  185         struct mbuf *m;
  186         u_int len;
  187 
  188         /*
  189          * NB: we know the mbuf routines will align the data area
  190          *     so we don't need to do anything special.
  191          */
  192         /* XXX 4-address frame? */
  193         len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4);
  194         KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len));
  195         if (len < MINCLSIZE) {
  196                 m = m_gethdr(M_NOWAIT, MT_HEADER);
  197                 /*
  198                  * Align the data in case additional headers are added.
  199                  * This should only happen when a WEP header is added
  200                  * which only happens for shared key authentication mgt
  201                  * frames which all fit in MHLEN.
  202                  */
  203                 if (m != NULL)
  204                         MH_ALIGN(m, len);
  205         } else
  206                 m = m_getcl(M_NOWAIT, MT_HEADER, M_PKTHDR);
  207         if (m != NULL) {
  208                 m->m_data += sizeof(struct ieee80211_frame);
  209                 *frm = m->m_data;
  210         }
  211         return m;
  212 }
  213 
  214 #include <sys/libkern.h>
  215 
  216 void
  217 get_random_bytes(void *p, size_t n)
  218 {
  219         u_int8_t *dp = p;
  220 
  221         while (n > 0) {
  222                 u_int32_t v = arc4random();
  223                 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n;
  224                 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n);
  225                 dp += sizeof(u_int32_t), n -= nb;
  226         }
  227 }
  228 
  229 void
  230 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc)
  231 {
  232         struct ifnet *ifp = ic->ic_ifp;
  233         struct ieee80211_join_event iev;
  234 
  235         memset(&iev, 0, sizeof(iev));
  236         if (ni == ic->ic_bss) {
  237                 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid);
  238                 rt_ieee80211msg(ifp, newassoc ?
  239                         RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC,
  240                         &iev, sizeof(iev));
  241                 if_link_state_change(ifp, LINK_STATE_UP);
  242         } else {
  243                 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
  244                 rt_ieee80211msg(ifp, newassoc ?
  245                         RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN,
  246                         &iev, sizeof(iev));
  247         }
  248 }
  249 
  250 void
  251 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
  252 {
  253         struct ifnet *ifp = ic->ic_ifp;
  254         struct ieee80211_leave_event iev;
  255 
  256         if (ni == ic->ic_bss) {
  257                 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0);
  258                 if_link_state_change(ifp, LINK_STATE_DOWN);
  259         } else {
  260                 /* fire off wireless event station leaving */
  261                 memset(&iev, 0, sizeof(iev));
  262                 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr);
  263                 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev));
  264         }
  265 }
  266 
  267 void
  268 ieee80211_notify_scan_done(struct ieee80211com *ic)
  269 {
  270         struct ifnet *ifp = ic->ic_ifp;
  271 
  272         IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done");
  273 
  274         /* dispatch wireless event indicating scan completed */
  275         rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0);
  276 }
  277 
  278 void
  279 ieee80211_notify_replay_failure(struct ieee80211com *ic,
  280         const struct ieee80211_frame *wh, const struct ieee80211_key *k,
  281         u_int64_t rsc)
  282 {
  283         struct ifnet *ifp = ic->ic_ifp;
  284 
  285         IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
  286             "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n",
  287             ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name,
  288             (intmax_t) rsc, (intmax_t) k->wk_keyrsc,
  289             k->wk_keyix, k->wk_rxkeyix);
  290 
  291         if (ifp != NULL) {              /* NB: for cipher test modules */
  292                 struct ieee80211_replay_event iev;
  293 
  294                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  295                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  296                 iev.iev_cipher = k->wk_cipher->ic_cipher;
  297                 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE)
  298                         iev.iev_keyix = k->wk_rxkeyix;
  299                 else
  300                         iev.iev_keyix = k->wk_keyix;
  301                 iev.iev_keyrsc = k->wk_keyrsc;
  302                 iev.iev_rsc = rsc;
  303                 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev));
  304         }
  305 }
  306 
  307 void
  308 ieee80211_notify_michael_failure(struct ieee80211com *ic,
  309         const struct ieee80211_frame *wh, u_int keyix)
  310 {
  311         struct ifnet *ifp = ic->ic_ifp;
  312 
  313         IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
  314                 "[%s] michael MIC verification failed <keyix %u>\n",
  315                ether_sprintf(wh->i_addr2), keyix);
  316         ic->ic_stats.is_rx_tkipmic++;
  317 
  318         if (ifp != NULL) {              /* NB: for cipher test modules */
  319                 struct ieee80211_michael_event iev;
  320 
  321                 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1);
  322                 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2);
  323                 iev.iev_cipher = IEEE80211_CIPHER_TKIP;
  324                 iev.iev_keyix = keyix;
  325                 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev));
  326         }
  327 }
  328 
  329 void
  330 ieee80211_load_module(const char *modname)
  331 {
  332 #ifdef notyet
  333         struct thread *td = curthread;
  334 
  335         if (suser(td) == 0 && securelevel_gt(td->td_ucred, 0) == 0) {
  336                 mtx_lock(&Giant);
  337                 (void) linker_load_module(modname, NULL, NULL, NULL, NULL);
  338                 mtx_unlock(&Giant);
  339         }
  340 #else
  341         printf("%s: load the %s module by hand for now.\n", __func__, modname);
  342 #endif
  343 }
  344 
  345 /*
  346  * Module glue.
  347  *
  348  * NB: the module name is "wlan" for compatibility with NetBSD.
  349  */
  350 static int
  351 wlan_modevent(module_t mod, int type, void *unused)
  352 {
  353         switch (type) {
  354         case MOD_LOAD:
  355                 if (bootverbose)
  356                         printf("wlan: <802.11 Link Layer>\n");
  357                 return 0;
  358         case MOD_UNLOAD:
  359                 return 0;
  360         }
  361         return EINVAL;
  362 }
  363 
  364 static moduledata_t wlan_mod = {
  365         "wlan",
  366         wlan_modevent,
  367         0
  368 };
  369 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
  370 MODULE_VERSION(wlan, 1);
  371 MODULE_DEPEND(wlan, ether, 1, 1, 1);

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