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/10.1/sys/net/if_faith.c 263478 2014-03-21 15:15:30Z glebius $
   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 #include <net/vnet.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 struct faith_softc {
   83         struct ifnet *sc_ifp;
   84 };
   85 
   86 static int faithioctl(struct ifnet *, u_long, caddr_t);
   87 static int faithoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
   88         struct route *);
   89 static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   90 #ifdef INET6
   91 static int faithprefix(struct in6_addr *);
   92 #endif
   93 
   94 static int faithmodevent(module_t, int, void *);
   95 
   96 static const char faithname[] = "faith";
   97 static MALLOC_DEFINE(M_FAITH, faithname, "Firewall Assisted Tunnel Interface");
   98 
   99 static int      faith_clone_create(struct if_clone *, int, caddr_t);
  100 static void     faith_clone_destroy(struct ifnet *);
  101 static struct if_clone *faith_cloner;
  102 
  103 #define FAITHMTU        1500
  104 
  105 static int
  106 faithmodevent(mod, type, data)
  107         module_t mod;
  108         int type;
  109         void *data;
  110 {
  111 
  112         switch (type) {
  113         case MOD_LOAD:
  114                 faith_cloner = if_clone_simple(faithname, faith_clone_create,
  115                     faith_clone_destroy, 0);
  116 #ifdef INET6
  117                 faithprefix_p = faithprefix;
  118 #endif
  119 
  120                 break;
  121         case MOD_UNLOAD:
  122 #ifdef INET6
  123                 faithprefix_p = NULL;
  124 #endif
  125 
  126                 if_clone_detach(faith_cloner);
  127                 break;
  128         default:
  129                 return EOPNOTSUPP;
  130         }
  131         return 0;
  132 }
  133 
  134 static moduledata_t faith_mod = {
  135         "if_faith",
  136         faithmodevent,
  137         0
  138 };
  139 
  140 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  141 MODULE_VERSION(if_faith, 1);
  142 
  143 static int
  144 faith_clone_create(ifc, unit, params)
  145         struct if_clone *ifc;
  146         int unit;
  147         caddr_t params;
  148 {
  149         struct ifnet *ifp;
  150         struct faith_softc *sc;
  151 
  152         sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
  153         ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
  154         if (ifp == NULL) {
  155                 free(sc, M_FAITH);
  156                 return (ENOSPC);
  157         }
  158 
  159         ifp->if_softc = sc;
  160         if_initname(sc->sc_ifp, faithname, unit);
  161 
  162         ifp->if_mtu = FAITHMTU;
  163         /* Change to BROADCAST experimentaly to announce its prefix. */
  164         ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  165         ifp->if_ioctl = faithioctl;
  166         ifp->if_output = faithoutput;
  167         ifp->if_hdrlen = 0;
  168         ifp->if_addrlen = 0;
  169         ifp->if_snd.ifq_maxlen = ifqmaxlen;
  170         if_attach(ifp);
  171         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  172         return (0);
  173 }
  174 
  175 static void
  176 faith_clone_destroy(ifp)
  177         struct ifnet *ifp;
  178 {
  179         struct faith_softc *sc = ifp->if_softc;
  180 
  181         bpfdetach(ifp);
  182         if_detach(ifp);
  183         if_free(ifp);
  184         free(sc, M_FAITH);
  185 }
  186 
  187 static int
  188 faithoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  189         struct route *ro)
  190 {
  191         int isr;
  192         u_int32_t af;
  193         struct rtentry *rt = NULL;
  194 
  195         M_ASSERTPKTHDR(m);
  196 
  197         if (ro != NULL)
  198                 rt = ro->ro_rt;
  199         /* BPF writes need to be handled specially. */
  200         if (dst->sa_family == AF_UNSPEC)
  201                 bcopy(dst->sa_data, &af, sizeof(af));
  202         else
  203                 af = dst->sa_family;
  204 
  205         if (bpf_peers_present(ifp->if_bpf))
  206                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  207 
  208         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  209                 m_freem(m);
  210                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  211                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  212         }
  213         ifp->if_opackets++;
  214         ifp->if_obytes += m->m_pkthdr.len;
  215         switch (af) {
  216 #ifdef INET
  217         case AF_INET:
  218                 isr = NETISR_IP;
  219                 break;
  220 #endif
  221 #ifdef INET6
  222         case AF_INET6:
  223                 isr = NETISR_IPV6;
  224                 break;
  225 #endif
  226         default:
  227                 m_freem(m);
  228                 return EAFNOSUPPORT;
  229         }
  230 
  231         /* XXX do we need more sanity checks? */
  232 
  233         m->m_pkthdr.rcvif = ifp;
  234         ifp->if_ipackets++;
  235         ifp->if_ibytes += m->m_pkthdr.len;
  236         netisr_dispatch(isr, m);
  237         return (0);
  238 }
  239 
  240 /* ARGSUSED */
  241 static void
  242 faithrtrequest(cmd, rt, info)
  243         int cmd;
  244         struct rtentry *rt;
  245         struct rt_addrinfo *info;
  246 {
  247         RT_LOCK_ASSERT(rt);
  248         rt->rt_mtu = rt->rt_ifp->if_mtu;
  249 }
  250 
  251 /*
  252  * Process an ioctl request.
  253  */
  254 /* ARGSUSED */
  255 static int
  256 faithioctl(ifp, cmd, data)
  257         struct ifnet *ifp;
  258         u_long cmd;
  259         caddr_t data;
  260 {
  261         struct ifaddr *ifa;
  262         struct ifreq *ifr = (struct ifreq *)data;
  263         int error = 0;
  264 
  265         switch (cmd) {
  266 
  267         case SIOCSIFADDR:
  268                 ifp->if_flags |= IFF_UP;
  269                 ifp->if_drv_flags |= IFF_DRV_RUNNING;
  270                 ifa = (struct ifaddr *)data;
  271                 ifa->ifa_rtrequest = faithrtrequest;
  272                 /*
  273                  * Everything else is done at a higher level.
  274                  */
  275                 break;
  276 
  277         case SIOCADDMULTI:
  278         case SIOCDELMULTI:
  279                 if (ifr == 0) {
  280                         error = EAFNOSUPPORT;           /* XXX */
  281                         break;
  282                 }
  283                 switch (ifr->ifr_addr.sa_family) {
  284 #ifdef INET
  285                 case AF_INET:
  286                         break;
  287 #endif
  288 #ifdef INET6
  289                 case AF_INET6:
  290                         break;
  291 #endif
  292 
  293                 default:
  294                         error = EAFNOSUPPORT;
  295                         break;
  296                 }
  297                 break;
  298 
  299 #ifdef SIOCSIFMTU
  300         case SIOCSIFMTU:
  301                 ifp->if_mtu = ifr->ifr_mtu;
  302                 break;
  303 #endif
  304 
  305         case SIOCSIFFLAGS:
  306                 break;
  307 
  308         default:
  309                 error = EINVAL;
  310         }
  311         return (error);
  312 }
  313 
  314 #ifdef INET6
  315 /*
  316  * XXX could be slow
  317  * XXX could be layer violation to call sys/net from sys/netinet6
  318  */
  319 static int
  320 faithprefix(in6)
  321         struct in6_addr *in6;
  322 {
  323         struct rtentry *rt;
  324         struct sockaddr_in6 sin6;
  325         int ret;
  326 
  327         if (V_ip6_keepfaith == 0)
  328                 return 0;
  329 
  330         bzero(&sin6, sizeof(sin6));
  331         sin6.sin6_family = AF_INET6;
  332         sin6.sin6_len = sizeof(struct sockaddr_in6);
  333         sin6.sin6_addr = *in6;
  334         rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
  335         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  336             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  337                 ret = 1;
  338         else
  339                 ret = 0;
  340         if (rt)
  341                 RTFREE_LOCKED(rt);
  342         return ret;
  343 }
  344 #endif
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FreeBSD/Linux Kernel Cross Reference sys/net/if_faith.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_faith.c
