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  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by the University of
   18  *      California, Berkeley and its contributors.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  * $FreeBSD: releng/5.0/sys/net/if_faith.c 106939 2002-11-15 00:00:15Z sam $
   36  */
   37 /*
   38  * derived from
   39  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
   40  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
   41  */
   42 
   43 /*
   44  * Loopback interface driver for protocol testing and timing.
   45  */
   46 #include "opt_inet.h"
   47 #include "opt_inet6.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/socket.h>
   54 #include <sys/errno.h>
   55 #include <sys/sockio.h>
   56 #include <sys/time.h>
   57 #include <sys/queue.h>
   58 #include <sys/types.h>
   59 #include <sys/malloc.h>
   60 
   61 #include <net/if.h>
   62 #include <net/if_types.h>
   63 #include <net/netisr.h>
   64 #include <net/route.h>
   65 #include <net/bpf.h>
   66 
   67 #ifdef  INET
   68 #include <netinet/in.h>
   69 #include <netinet/in_systm.h>
   70 #include <netinet/in_var.h>
   71 #include <netinet/ip.h>
   72 #endif
   73 
   74 #ifdef INET6
   75 #ifndef INET
   76 #include <netinet/in.h>
   77 #endif
   78 #include <netinet6/in6_var.h>
   79 #include <netinet/ip6.h>
   80 #include <netinet6/ip6_var.h>
   81 #endif
   82 
   83 #include <net/net_osdep.h>
   84 
   85 #define FAITHNAME       "faith"
   86 
   87 struct faith_softc {
   88         struct ifnet sc_if;     /* must be first */
   89         LIST_ENTRY(faith_softc) sc_list;
   90 };
   91 
   92 static int faithioctl(struct ifnet *, u_long, caddr_t);
   93 int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
   94         struct rtentry *);
   95 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   96 #ifdef INET6
   97 static int faithprefix(struct in6_addr *);
   98 #endif
   99 
  100 static int faithmodevent(module_t, int, void *);
  101 
  102 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
  103 static LIST_HEAD(, faith_softc) faith_softc_list;
  104 
  105 int     faith_clone_create(struct if_clone *, int);
  106 void    faith_clone_destroy(struct ifnet *);
  107 
  108 struct if_clone faith_cloner = IF_CLONE_INITIALIZER(FAITHNAME,
  109     faith_clone_create, faith_clone_destroy, 0, IF_MAXUNIT);
  110 
  111 #define FAITHMTU        1500
  112 
  113 static int
  114 faithmodevent(mod, type, data)
  115         module_t mod;
  116         int type;
  117         void *data;
  118 {
  119 
  120         switch (type) {
  121         case MOD_LOAD:
  122                 LIST_INIT(&faith_softc_list);
  123                 if_clone_attach(&faith_cloner);
  124 
  125 #ifdef INET6
  126                 faithprefix_p = faithprefix;
  127 #endif
  128 
  129                 break;
  130         case MOD_UNLOAD:
  131 #ifdef INET6
  132                 faithprefix_p = NULL;
  133 #endif
  134 
  135                 if_clone_detach(&faith_cloner);
  136 
  137                 while (!LIST_EMPTY(&faith_softc_list))
  138                         faith_clone_destroy(
  139                             &LIST_FIRST(&faith_softc_list)->sc_if);
  140 
  141                 break;
  142         }
  143         return 0;
  144 }
  145 
  146 static moduledata_t faith_mod = {
  147         "if_faith",
  148         faithmodevent,
  149         0
  150 };
  151 
  152 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  153 MODULE_VERSION(if_faith, 1);
  154 
  155 int
  156 faith_clone_create(ifc, unit)
  157         struct if_clone *ifc;
  158         int unit;
  159 {
  160         struct faith_softc *sc;
  161 
  162         sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK);
  163         bzero(sc, sizeof(struct faith_softc));
  164 
  165         sc->sc_if.if_softc = sc;
  166         sc->sc_if.if_name = FAITHNAME;
  167         sc->sc_if.if_unit = unit;
  168 
  169         sc->sc_if.if_mtu = FAITHMTU;
  170         /* Change to BROADCAST experimentaly to announce its prefix. */
  171         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  172         sc->sc_if.if_ioctl = faithioctl;
  173         sc->sc_if.if_output = faithoutput;
  174         sc->sc_if.if_type = IFT_FAITH;
  175         sc->sc_if.if_hdrlen = 0;
  176         sc->sc_if.if_addrlen = 0;
  177         sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
  178         if_attach(&sc->sc_if);
  179         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
  180         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
  181         return (0);
  182 }
  183 
  184 void
  185 faith_clone_destroy(ifp)
  186         struct ifnet *ifp;
  187 {
  188         struct faith_softc *sc = (void *) ifp;
  189 
  190         LIST_REMOVE(sc, sc_list);
  191         bpfdetach(ifp);
  192         if_detach(ifp);
  193 
  194         free(sc, M_FAITH);
  195 }
  196 
  197 int
  198 faithoutput(ifp, m, dst, rt)
  199         struct ifnet *ifp;
  200         struct mbuf *m;
  201         struct sockaddr *dst;
  202         struct rtentry *rt;
  203 {
  204         int isr;
  205         struct ifqueue *ifq = 0;
  206 
  207         if ((m->m_flags & M_PKTHDR) == 0)
  208                 panic("faithoutput no HDR");
  209 
  210         /* BPF write needs to be handled specially */
  211         if (dst->sa_family == AF_UNSPEC) {
  212                 dst->sa_family = *(mtod(m, int *));
  213                 m->m_len -= sizeof(int);
  214                 m->m_pkthdr.len -= sizeof(int);
  215                 m->m_data += sizeof(int);
  216         }
  217 
  218         if (ifp->if_bpf) {
  219                 /*
  220                  * We need to prepend the address family as
  221                  * a four byte field.  Cons up a faith header
  222                  * to pacify bpf.  This is safe because bpf
  223                  * will only read from the mbuf (i.e., it won't
  224                  * try to free it or keep a pointer a to it).
  225                  */
  226                 struct mbuf m0;
  227                 u_int32_t af = dst->sa_family;
  228 
  229                 m0.m_next = m;
  230                 m0.m_len = 4;
  231                 m0.m_data = (char *)&af;
  232 
  233                 BPF_MTAP(ifp, &m0);
  234         }
  235 
  236         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  237                 m_freem(m);
  238                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  239                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  240         }
  241         ifp->if_opackets++;
  242         ifp->if_obytes += m->m_pkthdr.len;
  243         switch (dst->sa_family) {
  244 #ifdef INET
  245         case AF_INET:
  246                 ifq = &ipintrq;
  247                 isr = NETISR_IP;
  248                 break;
  249 #endif
  250 #ifdef INET6
  251         case AF_INET6:
  252                 ifq = &ip6intrq;
  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         (void) IF_HANDOFF(ifq, m, NULL);
  267         schednetisr(isr);
  268         return (0);
  269 }
  270 
  271 /* ARGSUSED */
  272 static void
  273 faithrtrequest(cmd, rt, info)
  274         int cmd;
  275         struct rtentry *rt;
  276         struct rt_addrinfo *info;
  277 {
  278         if (rt) {
  279                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
  280                 /*
  281                  * For optimal performance, the send and receive buffers
  282                  * should be at least twice the MTU plus a little more for
  283                  * overhead.
  284                  */
  285                 rt->rt_rmx.rmx_recvpipe =
  286                         rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
  287         }
  288 }
  289 
  290 /*
  291  * Process an ioctl request.
  292  */
  293 /* ARGSUSED */
  294 static int
  295 faithioctl(ifp, cmd, data)
  296         struct ifnet *ifp;
  297         u_long cmd;
  298         caddr_t data;
  299 {
  300         struct ifaddr *ifa;
  301         struct ifreq *ifr = (struct ifreq *)data;
  302         int error = 0;
  303 
  304         switch (cmd) {
  305 
  306         case SIOCSIFADDR:
  307                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
  308                 ifa = (struct ifaddr *)data;
  309                 ifa->ifa_rtrequest = faithrtrequest;
  310                 /*
  311                  * Everything else is done at a higher level.
  312                  */
  313                 break;
  314 
  315         case SIOCADDMULTI:
  316         case SIOCDELMULTI:
  317                 if (ifr == 0) {
  318                         error = EAFNOSUPPORT;           /* XXX */
  319                         break;
  320                 }
  321                 switch (ifr->ifr_addr.sa_family) {
  322 #ifdef INET
  323                 case AF_INET:
  324                         break;
  325 #endif
  326 #ifdef INET6
  327                 case AF_INET6:
  328                         break;
  329 #endif
  330 
  331                 default:
  332                         error = EAFNOSUPPORT;
  333                         break;
  334                 }
  335                 break;
  336 
  337 #ifdef SIOCSIFMTU
  338         case SIOCSIFMTU:
  339                 ifp->if_mtu = ifr->ifr_mtu;
  340                 break;
  341 #endif
  342 
  343         case SIOCSIFFLAGS:
  344                 break;
  345 
  346         default:
  347                 error = EINVAL;
  348         }
  349         return (error);
  350 }
  351 
  352 #ifdef INET6
  353 /*
  354  * XXX could be slow
  355  * XXX could be layer violation to call sys/net from sys/netinet6
  356  */
  357 static int
  358 faithprefix(in6)
  359         struct in6_addr *in6;
  360 {
  361         struct rtentry *rt;
  362         struct sockaddr_in6 sin6;
  363         int ret;
  364 
  365         if (ip6_keepfaith == 0)
  366                 return 0;
  367 
  368         bzero(&sin6, sizeof(sin6));
  369         sin6.sin6_family = AF_INET6;
  370         sin6.sin6_len = sizeof(struct sockaddr_in6);
  371         sin6.sin6_addr = *in6;
  372         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  373         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  374             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  375                 ret = 1;
  376         else
  377                 ret = 0;
  378         if (rt)
  379                 RTFREE(rt);
  380         return ret;
  381 }
  382 #endif
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FreeBSD/Linux Kernel Cross Reference sys/net/if_faith.c

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sys/net/if_faith.c
