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: releng/6.3/sys/net/if_faith.c 173886 2007-11-24 19:45:58Z cvs2svn $
   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_ifp;
   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 ifnet *ifp;
  169         struct faith_softc *sc;
  170 
  171         sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
  172         ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
  173         if (ifp == NULL) {
  174                 free(sc, M_FAITH);
  175                 return (ENOSPC);
  176         }
  177 
  178         ifp->if_softc = sc;
  179         if_initname(sc->sc_ifp, ifc->ifc_name, unit);
  180 
  181         ifp->if_mtu = FAITHMTU;
  182         /* Change to BROADCAST experimentaly to announce its prefix. */
  183         ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  184         ifp->if_ioctl = faithioctl;
  185         ifp->if_output = faithoutput;
  186         ifp->if_hdrlen = 0;
  187         ifp->if_addrlen = 0;
  188         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  189         if_attach(ifp);
  190         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  191         mtx_lock(&faith_mtx);
  192         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
  193         mtx_unlock(&faith_mtx);
  194         return (0);
  195 }
  196 
  197 static void
  198 faith_destroy(struct faith_softc *sc)
  199 {
  200 
  201         bpfdetach(sc->sc_ifp);
  202         if_detach(sc->sc_ifp);
  203         if_free(sc->sc_ifp);
  204         free(sc, M_FAITH);
  205 }
  206 
  207 static void
  208 faith_clone_destroy(ifp)
  209         struct ifnet *ifp;
  210 {
  211         struct faith_softc *sc = ifp->if_softc;
  212 
  213         mtx_lock(&faith_mtx);
  214         LIST_REMOVE(sc, sc_list);
  215         mtx_unlock(&faith_mtx);
  216 
  217         faith_destroy(sc);
  218 }
  219 
  220 int
  221 faithoutput(ifp, m, dst, rt)
  222         struct ifnet *ifp;
  223         struct mbuf *m;
  224         struct sockaddr *dst;
  225         struct rtentry *rt;
  226 {
  227         int isr;
  228         u_int32_t af;
  229 
  230         M_ASSERTPKTHDR(m);
  231 
  232         /* BPF writes need to be handled specially. */
  233         if (dst->sa_family == AF_UNSPEC) {
  234                 bcopy(dst->sa_data, &af, sizeof(af));
  235                 dst->sa_family = af;
  236         }
  237 
  238         if (bpf_peers_present(ifp->if_bpf)) {
  239                 af = dst->sa_family;
  240                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  241         }
  242 
  243         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  244                 m_freem(m);
  245                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  246                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  247         }
  248         ifp->if_opackets++;
  249         ifp->if_obytes += m->m_pkthdr.len;
  250         switch (dst->sa_family) {
  251 #ifdef INET
  252         case AF_INET:
  253                 isr = NETISR_IP;
  254                 break;
  255 #endif
  256 #ifdef INET6
  257         case AF_INET6:
  258                 isr = NETISR_IPV6;
  259                 break;
  260 #endif
  261         default:
  262                 m_freem(m);
  263                 return EAFNOSUPPORT;
  264         }
  265 
  266         /* XXX do we need more sanity checks? */
  267 
  268         m->m_pkthdr.rcvif = ifp;
  269         ifp->if_ipackets++;
  270         ifp->if_ibytes += m->m_pkthdr.len;
  271         netisr_dispatch(isr, m);
  272         return (0);
  273 }
  274 
  275 /* ARGSUSED */
  276 static void
  277 faithrtrequest(cmd, rt, info)
  278         int cmd;
  279         struct rtentry *rt;
  280         struct rt_addrinfo *info;
  281 {
  282         RT_LOCK_ASSERT(rt);
  283         rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
  284 }
  285 
  286 /*
  287  * Process an ioctl request.
  288  */
  289 /* ARGSUSED */
  290 static int
  291 faithioctl(ifp, cmd, data)
  292         struct ifnet *ifp;
  293         u_long cmd;
  294         caddr_t data;
  295 {
  296         struct ifaddr *ifa;
  297         struct ifreq *ifr = (struct ifreq *)data;
  298         int error = 0;
  299 
  300         switch (cmd) {
  301 
  302         case SIOCSIFADDR:
  303                 ifp->if_flags |= IFF_UP;
  304                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  305                 ifa = (struct ifaddr *)data;
  306                 ifa->ifa_rtrequest = faithrtrequest;
  307                 /*
  308                  * Everything else is done at a higher level.
  309                  */
  310                 break;
  311 
  312         case SIOCADDMULTI:
  313         case SIOCDELMULTI:
  314                 if (ifr == 0) {
  315                         error = EAFNOSUPPORT;           /* XXX */
  316                         break;
  317                 }
  318                 switch (ifr->ifr_addr.sa_family) {
  319 #ifdef INET
  320                 case AF_INET:
  321                         break;
  322 #endif
  323 #ifdef INET6
  324                 case AF_INET6:
  325                         break;
  326 #endif
  327 
  328                 default:
  329                         error = EAFNOSUPPORT;
  330                         break;
  331                 }
  332                 break;
  333 
  334 #ifdef SIOCSIFMTU
  335         case SIOCSIFMTU:
  336                 ifp->if_mtu = ifr->ifr_mtu;
  337                 break;
  338 #endif
  339 
  340         case SIOCSIFFLAGS:
  341                 break;
  342 
  343         default:
  344                 error = EINVAL;
  345         }
  346         return (error);
  347 }
  348 
  349 #ifdef INET6
  350 /*
  351  * XXX could be slow
  352  * XXX could be layer violation to call sys/net from sys/netinet6
  353  */
  354 static int
  355 faithprefix(in6)
  356         struct in6_addr *in6;
  357 {
  358         struct rtentry *rt;
  359         struct sockaddr_in6 sin6;
  360         int ret;
  361 
  362         if (ip6_keepfaith == 0)
  363                 return 0;
  364 
  365         bzero(&sin6, sizeof(sin6));
  366         sin6.sin6_family = AF_INET6;
  367         sin6.sin6_len = sizeof(struct sockaddr_in6);
  368         sin6.sin6_addr = *in6;
  369         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  370         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  371             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  372                 ret = 1;
  373         else
  374                 ret = 0;
  375         if (rt)
  376                 RTFREE_LOCKED(rt);
  377         return ret;
  378 }
  379 #endif
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FreeBSD/Linux Kernel Cross Reference sys/net/if_faith.c

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sys/net/if_faith.c
