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  * $FreeBSD$
   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 #ifndef NFAITH
   47 #include "faith.h"
   48 #endif
   49 #include "opt_inet.h"
   50 #include "opt_inet6.h"
   51 
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/kernel.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/socket.h>
   57 #include <sys/errno.h>
   58 #include <sys/sockio.h>
   59 #include <sys/time.h>
   60 #include <sys/queue.h>
   61 #include <sys/types.h>
   62 #include <sys/malloc.h>
   63 #include <machine/bus.h>        /* XXX: Shouldn't really be required! */
   64 #include <sys/rman.h>
   65 
   66 #include <net/if.h>
   67 #include <net/if_types.h>
   68 #include <net/netisr.h>
   69 #include <net/route.h>
   70 #include <net/bpf.h>
   71 
   72 #ifdef  INET
   73 #include <netinet/in.h>
   74 #include <netinet/in_systm.h>
   75 #include <netinet/in_var.h>
   76 #include <netinet/ip.h>
   77 #endif
   78 
   79 #ifdef INET6
   80 #ifndef INET
   81 #include <netinet/in.h>
   82 #endif
   83 #include <netinet6/in6_var.h>
   84 #include <netinet/ip6.h>
   85 #include <netinet6/ip6_var.h>
   86 #endif
   87 
   88 #include <net/net_osdep.h>
   89 
   90 #define FAITHNAME       "faith"
   91 #define FAITH_MAXUNIT   0x7fff  /* ifp->if_unit is only 15 bits */
   92 
   93 struct faith_softc {
   94         struct ifnet sc_if;     /* must be first */
   95         struct resource *r_unit;
   96         LIST_ENTRY(faith_softc) sc_list;
   97 };
   98 
   99 static int faithioctl __P((struct ifnet *, u_long, caddr_t));
  100 int faithoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
  101         struct rtentry *));
  102 static void faithrtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
  103 static int faithprefix __P((struct in6_addr *));
  104 
  105 static int faithmodevent __P((module_t, int, void *));
  106 
  107 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
  108 static struct rman faithunits[1];
  109 LIST_HEAD(, faith_softc) faith_softc_list;
  110 
  111 int     faith_clone_create __P((struct if_clone *, int *));
  112 void    faith_clone_destroy __P((struct ifnet *));
  113 
  114 struct if_clone faith_cloner =
  115     IF_CLONE_INITIALIZER(FAITHNAME, faith_clone_create, faith_clone_destroy);
  116 
  117 #define FAITHMTU        1500
  118 
  119 static int
  120 faithmodevent(mod, type, data)
  121         module_t mod;
  122         int type;
  123         void *data;
  124 {
  125         int i;
  126         int err;
  127 
  128         switch (type) {
  129         case MOD_LOAD:
  130                 faithunits->rm_type = RMAN_ARRAY;
  131                 faithunits->rm_descr = "configurable if_faith units";
  132                 err = rman_init(faithunits);
  133                 if (err != 0)
  134                         return (err);
  135                 err = rman_manage_region(faithunits, 0, FAITH_MAXUNIT);
  136                 if (err != 0) {
  137                         printf("%s: faithunits: rman_manage_region: "
  138                             "Failed %d\n", FAITHNAME, err);
  139                         rman_fini(faithunits);
  140                         return (err);
  141                 }
  142                 LIST_INIT(&faith_softc_list);
  143                 if_clone_attach(&faith_cloner);
  144                 for(i = 0; i < NFAITH; i ++) {
  145                         err = faith_clone_create(&faith_cloner, &i);
  146                         KASSERT(err == 0,
  147                             ("Error creating initial faith interfaces"));
  148                 }
  149 
  150 #ifdef INET6
  151                 faithprefix_p = faithprefix;
  152 #endif
  153 
  154                 break;
  155         case MOD_UNLOAD:
  156 #ifdef INET6
  157                 faithprefix_p = NULL;
  158 #endif
  159 
  160                 if_clone_detach(&faith_cloner);
  161 
  162                 while (!LIST_EMPTY(&faith_softc_list))
  163                         faith_clone_destroy(
  164                             &LIST_FIRST(&faith_softc_list)->sc_if);
  165 
  166                 err = rman_fini(faithunits);
  167                 if (err != 0)
  168                         return (err);
  169 
  170                 break;
  171         }
  172         return 0;
  173 }
  174 
  175 static moduledata_t faith_mod = {
  176         "if_faith",
  177         faithmodevent,
  178         0
  179 };
  180 
  181 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  182 MODULE_VERSION(if_faith, 1);
  183 
  184 int
  185 faith_clone_create(ifc, unit)
  186         struct if_clone *ifc;
  187         int *unit;
  188 {
  189         struct resource *r;
  190         struct faith_softc *sc;
  191 
  192         if (*unit > FAITH_MAXUNIT)
  193                 return (ENXIO);
  194 
  195         if (*unit < 0) {
  196                 r = rman_reserve_resource(faithunits, 0, FAITH_MAXUNIT, 1,
  197                     RF_ALLOCATED | RF_ACTIVE, NULL);
  198                 if (r == NULL)
  199                         return (ENOSPC);
  200                 *unit = rman_get_start(r);
  201         } else {
  202                 r = rman_reserve_resource(faithunits, *unit, *unit, 1,
  203                     RF_ALLOCATED | RF_ACTIVE, NULL);
  204                 if (r == NULL)
  205                         return (ENOSPC);
  206         }
  207 
  208         sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK);
  209         bzero(sc, sizeof(struct faith_softc));
  210 
  211         sc->sc_if.if_softc = sc;
  212         sc->sc_if.if_name = FAITHNAME;
  213         sc->sc_if.if_unit = *unit;
  214         sc->r_unit = r;
  215 
  216         sc->sc_if.if_mtu = FAITHMTU;
  217         /* Change to BROADCAST experimentaly to announce its prefix. */
  218         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
  219         sc->sc_if.if_ioctl = faithioctl;
  220         sc->sc_if.if_output = faithoutput;
  221         sc->sc_if.if_type = IFT_FAITH;
  222         sc->sc_if.if_hdrlen = 0;
  223         sc->sc_if.if_addrlen = 0;
  224         sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
  225         if_attach(&sc->sc_if);
  226         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
  227         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
  228         return (0);
  229 }
  230 
  231 void
  232 faith_clone_destroy(ifp)
  233         struct ifnet *ifp;
  234 {
  235         int err;
  236         struct faith_softc *sc = (void *) ifp;
  237 
  238         LIST_REMOVE(sc, sc_list);
  239         bpfdetach(ifp);
  240         if_detach(ifp);
  241 
  242         err = rman_release_resource(sc->r_unit);
  243         KASSERT(err == 0, ("Unexpected error freeing resource"));
  244 
  245         free(sc, M_FAITH);
  246 }
  247 
  248 int
  249 faithoutput(ifp, m, dst, rt)
  250         struct ifnet *ifp;
  251         struct mbuf *m;
  252         struct sockaddr *dst;
  253         struct rtentry *rt;
  254 {
  255         int s, isr;
  256         struct ifqueue *ifq = 0;
  257 
  258         if ((m->m_flags & M_PKTHDR) == 0)
  259                 panic("faithoutput no HDR");
  260 
  261         /* BPF write needs to be handled specially */
  262         if (dst->sa_family == AF_UNSPEC) {
  263                 dst->sa_family = *(mtod(m, int *));
  264                 m->m_len -= sizeof(int);
  265                 m->m_pkthdr.len -= sizeof(int);
  266                 m->m_data += sizeof(int);
  267         }
  268 
  269         if (ifp->if_bpf) {
  270                 /*
  271                  * We need to prepend the address family as
  272                  * a four byte field.  Cons up a faith header
  273                  * to pacify bpf.  This is safe because bpf
  274                  * will only read from the mbuf (i.e., it won't
  275                  * try to free it or keep a pointer a to it).
  276                  */
  277                 struct mbuf m0;
  278                 u_int32_t af = dst->sa_family;
  279 
  280                 m0.m_next = m;
  281                 m0.m_len = 4;
  282                 m0.m_data = (char *)&af;
  283 
  284                 bpf_mtap(ifp, &m0);
  285         }
  286 
  287         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
  288                 m_freem(m);
  289                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
  290                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
  291         }
  292         ifp->if_opackets++;
  293         ifp->if_obytes += m->m_pkthdr.len;
  294         switch (dst->sa_family) {
  295 #ifdef INET
  296         case AF_INET:
  297                 ifq = &ipintrq;
  298                 isr = NETISR_IP;
  299                 break;
  300 #endif
  301 #ifdef INET6
  302         case AF_INET6:
  303                 ifq = &ip6intrq;
  304                 isr = NETISR_IPV6;
  305                 break;
  306 #endif
  307         default:
  308                 m_freem(m);
  309                 return EAFNOSUPPORT;
  310         }
  311 
  312         /* XXX do we need more sanity checks? */
  313 
  314         m->m_pkthdr.rcvif = ifp;
  315         s = splimp();
  316         if (IF_QFULL(ifq)) {
  317                 IF_DROP(ifq);
  318                 m_freem(m);
  319                 splx(s);
  320                 return (ENOBUFS);
  321         }
  322         IF_ENQUEUE(ifq, m);
  323         schednetisr(isr);
  324         ifp->if_ipackets++;
  325         ifp->if_ibytes += m->m_pkthdr.len;
  326         splx(s);
  327         return (0);
  328 }
  329 
  330 /* ARGSUSED */
  331 static void
  332 faithrtrequest(cmd, rt, info)
  333         int cmd;
  334         struct rtentry *rt;
  335         struct rt_addrinfo *info;
  336 {
  337         if (rt) {
  338                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
  339                 /*
  340                  * For optimal performance, the send and receive buffers
  341                  * should be at least twice the MTU plus a little more for
  342                  * overhead.
  343                  */
  344                 rt->rt_rmx.rmx_recvpipe =
  345                         rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
  346         }
  347 }
  348 
  349 /*
  350  * Process an ioctl request.
  351  */
  352 /* ARGSUSED */
  353 static int
  354 faithioctl(ifp, cmd, data)
  355         struct ifnet *ifp;
  356         u_long cmd;
  357         caddr_t data;
  358 {
  359         struct ifaddr *ifa;
  360         struct ifreq *ifr = (struct ifreq *)data;
  361         int error = 0;
  362 
  363         switch (cmd) {
  364 
  365         case SIOCSIFADDR:
  366                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
  367                 ifa = (struct ifaddr *)data;
  368                 ifa->ifa_rtrequest = faithrtrequest;
  369                 /*
  370                  * Everything else is done at a higher level.
  371                  */
  372                 break;
  373 
  374         case SIOCADDMULTI:
  375         case SIOCDELMULTI:
  376                 if (ifr == 0) {
  377                         error = EAFNOSUPPORT;           /* XXX */
  378                         break;
  379                 }
  380                 switch (ifr->ifr_addr.sa_family) {
  381 #ifdef INET
  382                 case AF_INET:
  383                         break;
  384 #endif
  385 #ifdef INET6
  386                 case AF_INET6:
  387                         break;
  388 #endif
  389 
  390                 default:
  391                         error = EAFNOSUPPORT;
  392                         break;
  393                 }
  394                 break;
  395 
  396 #ifdef SIOCSIFMTU
  397         case SIOCSIFMTU:
  398                 ifp->if_mtu = ifr->ifr_mtu;
  399                 break;
  400 #endif
  401 
  402         case SIOCSIFFLAGS:
  403                 break;
  404 
  405         default:
  406                 error = EINVAL;
  407         }
  408         return (error);
  409 }
  410 
  411 #ifdef INET6
  412 /*
  413  * XXX could be slow
  414  * XXX could be layer violation to call sys/net from sys/netinet6
  415  */
  416 static int
  417 faithprefix(in6)
  418         struct in6_addr *in6;
  419 {
  420         struct rtentry *rt;
  421         struct sockaddr_in6 sin6;
  422         int ret;
  423 
  424         if (ip6_keepfaith == 0)
  425                 return 0;
  426 
  427         bzero(&sin6, sizeof(sin6));
  428         sin6.sin6_family = AF_INET6;
  429         sin6.sin6_len = sizeof(struct sockaddr_in6);
  430         sin6.sin6_addr = *in6;
  431         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
  432         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
  433             (rt->rt_ifp->if_flags & IFF_UP) != 0)
  434                 ret = 1;
  435         else
  436                 ret = 0;
  437         if (rt)
  438                 RTFREE(rt);
  439         return ret;
  440 }
  441 #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
