if_faith.c

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    1 /*      $NetBSD: if_faith.c,v 1.30 2004/12/04 18:31:43 peter Exp $      */
    2 /*      $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $       */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 /*
   33  * derived from
   34  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
   35  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
   36  */
   37 
   38 /*
   39  * Loopback interface driver for protocol testing and timing.
   40  */
   41 
   42 #include <sys/cdefs.h>
   43 __KERNEL_RCSID(0, "$NetBSD: if_faith.c,v 1.30 2004/12/04 18:31:43 peter Exp $");
   44 
   45 #include "opt_inet.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/mbuf.h>
   51 #include <sys/socket.h>
   52 #include <sys/errno.h>
   53 #include <sys/ioctl.h>
   54 #include <sys/time.h>
   55 #include <sys/queue.h>
   56 
   57 #include <machine/cpu.h>
   58 
   59 #include <net/if.h>
   60 #include <net/if_types.h>
   61 #include <net/netisr.h>
   62 #include <net/route.h>
   63 #include <net/bpf.h>
   64 #include <net/if_faith.h>
   65 
   66 #ifdef  INET
   67 #include <netinet/in.h>
   68 #include <netinet/in_systm.h>
   69 #include <netinet/in_var.h>
   70 #include <netinet/ip.h>
   71 #endif
   72 
   73 #ifdef INET6
   74 #ifndef INET
   75 #include <netinet/in.h>
   76 #endif
   77 #include <netinet6/in6_var.h>
   78 #include <netinet/ip6.h>
   79 #include <netinet6/ip6_var.h>
   80 #endif
   81 
   82 #include "bpfilter.h"
   83 
   84 #include <net/net_osdep.h>
   85 
   86 struct faith_softc {
   87         struct ifnet sc_if;     /* must be first */
   88         LIST_ENTRY(faith_softc) sc_list;
   89 };
   90 
   91 static int faithioctl __P((struct ifnet *, u_long, caddr_t));
   92 int faithoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
   93         struct rtentry *));
   94 static void faithrtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
   95 
   96 void faithattach __P((int));
   97 
   98 LIST_HEAD(, faith_softc) faith_softc_list;
   99 
  100 int     faith_clone_create __P((struct if_clone *, int));
  101 int     faith_clone_destroy __P((struct ifnet *));
  102 
  103 struct if_clone faith_cloner =
  104     IF_CLONE_INITIALIZER("faith", faith_clone_create, faith_clone_destroy);
  105 
  106 #define FAITHMTU        1500
  107 
  108 /* ARGSUSED */
  109 void
  110 faithattach(count)
  111         int count;
  112 {
  113 
  114         LIST_INIT(&faith_softc_list);
  115         if_clone_attach(&faith_cloner);
  116 }
  117 
  118 int
  119 faith_clone_create(ifc, unit)
  120         struct if_clone *ifc;
  121         int unit;
  122 {
  123         struct faith_softc *sc;
  124 
  125         sc = malloc(sizeof(struct faith_softc), M_DEVBUF, M_WAITOK);
  126         memset(sc, 0, sizeof(struct faith_softc));
  127 
  128         snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d",
  129             ifc->ifc_name, unit);
  130 
  131         sc->sc_if.if_mtu = FAITHMTU;
  132         /* Change to BROADCAST experimentaly to announce its prefix. */
  133         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  134         sc->sc_if.if_ioctl = faithioctl;
  135         sc->sc_if.if_output = faithoutput;
  136         sc->sc_if.if_type = IFT_FAITH;
  137         sc->sc_if.if_hdrlen = 0;
  138         sc->sc_if.if_addrlen = 0;
  139         sc->sc_if.if_dlt = DLT_NULL;
  140         if_attach(&sc->sc_if);
  141         if_alloc_sadl(&sc->sc_if);
  142 #if NBPFILTER > 0
  143         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
  144 #endif
  145         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
  146         return (0);
  147 }
  148 
  149 int
  150 faith_clone_destroy(ifp)
  151         struct ifnet *ifp;
  152 {
  153         struct faith_softc *sc = (void *) ifp;
  154 
  155         LIST_REMOVE(sc, sc_list);
  156 #if NBPFILTER > 0
  157         bpfdetach(ifp);
  158 #endif
  159         if_detach(ifp);
  160         free(sc, M_DEVBUF);
  161 
  162         return (0);
  163 }
  164 
  165 int
  166 faithoutput(ifp, m, dst, rt)
  167         struct ifnet *ifp;
  168         struct mbuf *m;
  169         struct sockaddr *dst;
  170         struct rtentry *rt;
  171 {
  172         int s, isr;
  173         struct ifqueue *ifq = 0;
  174 
  175         if ((m->m_flags & M_PKTHDR) == 0)
  176                 panic("faithoutput no HDR");
  177 #if NBPFILTER > 0
  178         /* BPF write needs to be handled specially */
  179         if (dst->sa_family == AF_UNSPEC) {
  180                 dst->sa_family = *(mtod(m, int *));
  181                 m->m_len -= sizeof(int);
  182                 m->m_pkthdr.len -= sizeof(int);
  183                 m->m_data += sizeof(int);
  184         }
  185 
  186         if (ifp->if_bpf)
  187                 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m);
  188 #endif
  189 
  190         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  191                 m_freem(m);
  192                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  193                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  194         }
  195         ifp->if_opackets++;
  196         ifp->if_obytes += m->m_pkthdr.len;
  197         switch (dst->sa_family) {
  198 #ifdef INET
  199         case AF_INET:
  200                 ifq = &ipintrq;
  201                 isr = NETISR_IP;
  202                 break;
  203 #endif
  204 #ifdef INET6
  205         case AF_INET6:
  206                 ifq = &ip6intrq;
  207                 isr = NETISR_IPV6;
  208                 break;
  209 #endif
  210         default:
  211                 m_freem(m);
  212                 return EAFNOSUPPORT;
  213         }
  214 
  215         /* XXX do we need more sanity checks? */
  216 
  217         m->m_pkthdr.rcvif = ifp;
  218         s = splnet();
  219         if (IF_QFULL(ifq)) {
  220                 IF_DROP(ifq);
  221                 m_freem(m);
  222                 splx(s);
  223                 return (ENOBUFS);
  224         }
  225         IF_ENQUEUE(ifq, m);
  226         schednetisr(isr);
  227         ifp->if_ipackets++;
  228         ifp->if_ibytes += m->m_pkthdr.len;
  229         splx(s);
  230         return (0);
  231 }
  232 
  233 /* ARGSUSED */
  234 static void
  235 faithrtrequest(cmd, rt, info)
  236         int cmd;
  237         struct rtentry *rt;
  238         struct rt_addrinfo *info;
  239 {
  240         if (rt)
  241                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
  242 }
  243 
  244 /*
  245  * Process an ioctl request.
  246  */
  247 /* ARGSUSED */
  248 static int
  249 faithioctl(ifp, cmd, data)
  250         struct ifnet *ifp;
  251         u_long cmd;
  252         caddr_t data;
  253 {
  254         struct ifaddr *ifa;
  255         struct ifreq *ifr = (struct ifreq *)data;
  256         int error = 0;
  257 
  258         switch (cmd) {
  259 
  260         case SIOCSIFADDR:
  261                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
  262                 ifa = (struct ifaddr *)data;
  263                 ifa->ifa_rtrequest = faithrtrequest;
  264                 /*
  265                  * Everything else is done at a higher level.
  266                  */
  267                 break;
  268 
  269         case SIOCADDMULTI:
  270         case SIOCDELMULTI:
  271                 if (ifr == 0) {
  272                         error = EAFNOSUPPORT;           /* XXX */
  273                         break;
  274                 }
  275                 switch (ifr->ifr_addr.sa_family) {
  276 #ifdef INET
  277                 case AF_INET:
  278                         break;
  279 #endif
  280 #ifdef INET6
  281                 case AF_INET6:
  282                         break;
  283 #endif
  284 
  285                 default:
  286                         error = EAFNOSUPPORT;
  287                         break;
  288                 }
  289                 break;
  290 
  291 #ifdef SIOCSIFMTU
  292         case SIOCSIFMTU:
  293                 ifp->if_mtu = ifr->ifr_mtu;
  294                 break;
  295 #endif
  296 
  297         case SIOCSIFFLAGS:
  298                 break;
  299 
  300         default:
  301                 error = EINVAL;
  302         }
  303         return (error);
  304 }
  305 
  306 /*
  307  * XXX could be slow
  308  * XXX could be layer violation to call sys/net from sys/netinet6
  309  */
  310 int
  311 faithprefix(in6)
  312         struct in6_addr *in6;
  313 {
  314         struct rtentry *rt;
  315         struct sockaddr_in6 sin6;
  316         int ret;
  317 
  318         if (ip6_keepfaith == 0)
  319                 return 0;
  320 
  321         memset(&sin6, 0, sizeof(sin6));
  322         sin6.sin6_family = AF_INET6;
  323         sin6.sin6_len = sizeof(struct sockaddr_in6);
  324         sin6.sin6_addr = *in6;
  325         rt = rtalloc1((struct sockaddr *)&sin6, 0);
  326         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  327             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  328                 ret = 1;
  329         else
  330                 ret = 0;
  331         if (rt)
  332                 RTFREE(rt);
  333         return ret;
  334 }
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FreeBSD/Linux Kernel Cross Reference sys/net/if_faith.c

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sys/net/if_faith.c
