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/net/if_faith.c

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    1 /*      $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 4. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD$
   32  */
   33 /*
   34  * derived from
   35  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
   36  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
   37  */
   38 
   39 /*
   40  * Loopback interface driver for protocol testing and timing.
   41  */
   42 #include "opt_inet.h"
   43 #include "opt_inet6.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/kernel.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/module.h>
   50 #include <sys/socket.h>
   51 #include <sys/errno.h>
   52 #include <sys/sockio.h>
   53 #include <sys/time.h>
   54 #include <sys/queue.h>
   55 #include <sys/types.h>
   56 #include <sys/malloc.h>
   57 
   58 #include <net/if.h>
   59 #include <net/if_clone.h>
   60 #include <net/if_types.h>
   61 #include <net/netisr.h>
   62 #include <net/route.h>
   63 #include <net/bpf.h>
   64 
   65 #ifdef  INET
   66 #include <netinet/in.h>
   67 #include <netinet/in_systm.h>
   68 #include <netinet/in_var.h>
   69 #include <netinet/ip.h>
   70 #endif
   71 
   72 #ifdef INET6
   73 #ifndef INET
   74 #include <netinet/in.h>
   75 #endif
   76 #include <netinet6/in6_var.h>
   77 #include <netinet/ip6.h>
   78 #include <netinet6/ip6_var.h>
   79 #endif
   80 
   81 #include <net/net_osdep.h>
   82 
   83 #define FAITHNAME       "faith"
   84 
   85 struct faith_softc {
   86         struct ifnet sc_if;     /* must be first */
   87         LIST_ENTRY(faith_softc) sc_list;
   88 };
   89 
   90 static int faithioctl(struct ifnet *, u_long, caddr_t);
   91 int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
   92         struct rtentry *);
   93 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   94 #ifdef INET6
   95 static int faithprefix(struct in6_addr *);
   96 #endif
   97 
   98 static int faithmodevent(module_t, int, void *);
   99 
  100 static struct mtx faith_mtx;
  101 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
  102 static LIST_HEAD(, faith_softc) faith_softc_list;
  103 
  104 static int      faith_clone_create(struct if_clone *, int);
  105 static void     faith_clone_destroy(struct ifnet *);
  106 static void     faith_destroy(struct faith_softc *);
  107 
  108 IFC_SIMPLE_DECLARE(faith, 0);
  109 
  110 #define FAITHMTU        1500
  111 
  112 static int
  113 faithmodevent(mod, type, data)
  114         module_t mod;
  115         int type;
  116         void *data;
  117 {
  118         struct faith_softc *sc;
  119 
  120         switch (type) {
  121         case MOD_LOAD:
  122                 mtx_init(&faith_mtx, "faith_mtx", NULL, MTX_DEF);
  123                 LIST_INIT(&faith_softc_list);
  124                 if_clone_attach(&faith_cloner);
  125 
  126 #ifdef INET6
  127                 faithprefix_p = faithprefix;
  128 #endif
  129 
  130                 break;
  131         case MOD_UNLOAD:
  132 #ifdef INET6
  133                 faithprefix_p = NULL;
  134 #endif
  135 
  136                 if_clone_detach(&faith_cloner);
  137 
  138                 mtx_lock(&faith_mtx);
  139                 while ((sc = LIST_FIRST(&faith_softc_list)) != NULL) {
  140                         LIST_REMOVE(sc, sc_list);
  141                         mtx_unlock(&faith_mtx);
  142                         faith_destroy(sc);
  143                         mtx_lock(&faith_mtx);
  144                 }
  145                 mtx_unlock(&faith_mtx);
  146                 mtx_destroy(&faith_mtx);
  147                 break;
  148         default:
  149                 return EOPNOTSUPP;
  150         }
  151         return 0;
  152 }
  153 
  154 static moduledata_t faith_mod = {
  155         "if_faith",
  156         faithmodevent,
  157         0
  158 };
  159 
  160 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  161 MODULE_VERSION(if_faith, 1);
  162 
  163 static int
  164 faith_clone_create(ifc, unit)
  165         struct if_clone *ifc;
  166         int unit;
  167 {
  168         struct faith_softc *sc;
  169 
  170         sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
  171 
  172         sc->sc_if.if_softc = sc;
  173         if_initname(&sc->sc_if, ifc->ifc_name, unit);
  174 
  175         sc->sc_if.if_mtu = FAITHMTU;
  176         /* Change to BROADCAST experimentaly to announce its prefix. */
  177         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  178         sc->sc_if.if_ioctl = faithioctl;
  179         sc->sc_if.if_output = faithoutput;
  180         sc->sc_if.if_type = IFT_FAITH;
  181         sc->sc_if.if_hdrlen = 0;
  182         sc->sc_if.if_addrlen = 0;
  183         sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
  184         if_attach(&sc->sc_if);
  185         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
  186         mtx_lock(&faith_mtx);
  187         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
  188         mtx_unlock(&faith_mtx);
  189         return (0);
  190 }
  191 
  192 static void
  193 faith_destroy(struct faith_softc *sc)
  194 {
  195 
  196         bpfdetach(&sc->sc_if);
  197         if_detach(&sc->sc_if);
  198         free(sc, M_FAITH);
  199 }
  200 
  201 static void
  202 faith_clone_destroy(ifp)
  203         struct ifnet *ifp;
  204 {
  205         struct faith_softc *sc = (void *) ifp;
  206 
  207         mtx_lock(&faith_mtx);
  208         LIST_REMOVE(sc, sc_list);
  209         mtx_unlock(&faith_mtx);
  210 
  211         faith_destroy(sc);
  212 }
  213 
  214 int
  215 faithoutput(ifp, m, dst, rt)
  216         struct ifnet *ifp;
  217         struct mbuf *m;
  218         struct sockaddr *dst;
  219         struct rtentry *rt;
  220 {
  221         int isr;
  222 
  223         M_ASSERTPKTHDR(m);
  224 
  225         /* BPF write needs to be handled specially */
  226         if (dst->sa_family == AF_UNSPEC) {
  227                 dst->sa_family = *(mtod(m, int *));
  228                 m->m_len -= sizeof(int);
  229                 m->m_pkthdr.len -= sizeof(int);
  230                 m->m_data += sizeof(int);
  231         }
  232 
  233         if (ifp->if_bpf) {
  234                 u_int32_t af = dst->sa_family;
  235                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  236         }
  237 
  238         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  239                 m_freem(m);
  240                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  241                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  242         }
  243         ifp->if_opackets++;
  244         ifp->if_obytes += m->m_pkthdr.len;
  245         switch (dst->sa_family) {
  246 #ifdef INET
  247         case AF_INET:
  248                 isr = NETISR_IP;
  249                 break;
  250 #endif
  251 #ifdef INET6
  252         case AF_INET6:
  253                 isr = NETISR_IPV6;
  254                 break;
  255 #endif
  256         default:
  257                 m_freem(m);
  258                 return EAFNOSUPPORT;
  259         }
  260 
  261         /* XXX do we need more sanity checks? */
  262 
  263         m->m_pkthdr.rcvif = ifp;
  264         ifp->if_ipackets++;
  265         ifp->if_ibytes += m->m_pkthdr.len;
  266         netisr_dispatch(isr, m);
  267         return (0);
  268 }
  269 
  270 /* ARGSUSED */
  271 static void
  272 faithrtrequest(cmd, rt, info)
  273         int cmd;
  274         struct rtentry *rt;
  275         struct rt_addrinfo *info;
  276 {
  277         RT_LOCK_ASSERT(rt);
  278         if (rt)
  279                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
  280 }
  281 
  282 /*
  283  * Process an ioctl request.
  284  */
  285 /* ARGSUSED */
  286 static int
  287 faithioctl(ifp, cmd, data)
  288         struct ifnet *ifp;
  289         u_long cmd;
  290         caddr_t data;
  291 {
  292         struct ifaddr *ifa;
  293         struct ifreq *ifr = (struct ifreq *)data;
  294         int error = 0;
  295 
  296         switch (cmd) {
  297 
  298         case SIOCSIFADDR:
  299                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
  300                 ifa = (struct ifaddr *)data;
  301                 ifa->ifa_rtrequest = faithrtrequest;
  302                 /*
  303                  * Everything else is done at a higher level.
  304                  */
  305                 break;
  306 
  307         case SIOCADDMULTI:
  308         case SIOCDELMULTI:
  309                 if (ifr == 0) {
  310                         error = EAFNOSUPPORT;           /* XXX */
  311                         break;
  312                 }
  313                 switch (ifr->ifr_addr.sa_family) {
  314 #ifdef INET
  315                 case AF_INET:
  316                         break;
  317 #endif
  318 #ifdef INET6
  319                 case AF_INET6:
  320                         break;
  321 #endif
  322 
  323                 default:
  324                         error = EAFNOSUPPORT;
  325                         break;
  326                 }
  327                 break;
  328 
  329 #ifdef SIOCSIFMTU
  330         case SIOCSIFMTU:
  331                 ifp->if_mtu = ifr->ifr_mtu;
  332                 break;
  333 #endif
  334 
  335         case SIOCSIFFLAGS:
  336                 break;
  337 
  338         default:
  339                 error = EINVAL;
  340         }
  341         return (error);
  342 }
  343 
  344 #ifdef INET6
  345 /*
  346  * XXX could be slow
  347  * XXX could be layer violation to call sys/net from sys/netinet6
  348  */
  349 static int
  350 faithprefix(in6)
  351         struct in6_addr *in6;
  352 {
  353         struct rtentry *rt;
  354         struct sockaddr_in6 sin6;
  355         int ret;
  356 
  357         if (ip6_keepfaith == 0)
  358                 return 0;
  359 
  360         bzero(&sin6, sizeof(sin6));
  361         sin6.sin6_family = AF_INET6;
  362         sin6.sin6_len = sizeof(struct sockaddr_in6);
  363         sin6.sin6_addr = *in6;
  364         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  365         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  366             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  367                 ret = 1;
  368         else
  369                 ret = 0;
  370         if (rt)
  371                 RTFREE_LOCKED(rt);
  372         return ret;
  373 }
  374 #endif

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