sys/net/faith/if_faith.c

   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: src/sys/net/if_faith.c,v 1.3.2.6 2002/04/28 05:40:25 suz Exp $
  36  * $DragonFly: src/sys/net/faith/if_faith.c,v 1.18 2008/01/11 11:59:40 sephe Exp $
  37  */
  38 /*
  39  * derived from
  40  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
  41  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
  42  */
  43
  44 /*
  45  * Loopback interface driver for protocol testing and timing.
  46  */
  47 #ifndef NFAITH
  48 #include "use_faith.h"
  49 #endif
  50 #include "opt_inet.h"
  51 #include "opt_inet6.h"
  52
  53 #include <sys/param.h>
  54 #include <sys/systm.h>
  55 #include <sys/kernel.h>
  56 #include <sys/mbuf.h>
  57 #include <sys/bus.h>
  58 #include <sys/socket.h>
  59 #include <sys/errno.h>
  60 #include <sys/sockio.h>
  61 #include <sys/time.h>
  62 #include <sys/queue.h>
  63 #include <sys/types.h>
  64 #include <sys/malloc.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 #include <net/if_clone.h>
  72
  73 #ifdef  INET
  74 #include <netinet/in.h>
  75 #include <netinet/in_systm.h>
  76 #include <netinet/in_var.h>
  77 #include <netinet/ip.h>
  78 #endif
  79
  80 #ifdef INET6
  81 #ifndef INET
  82 #include <netinet/in.h>
  83 #endif
  84 #include <netinet6/in6_var.h>
  85 #include <netinet/ip6.h>
  86 #include <netinet6/ip6_var.h>
  87 #endif
  88
  89 #include <net/net_osdep.h>
  90
  91 #define FAITHNAME       "faith"
  92
  93 struct faith_softc {
  94         struct ifnet sc_if;     /* must be first */
  95         LIST_ENTRY(faith_softc) sc_list;
  96 };
  97
  98 static int faithioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
  99 int faithoutput (struct ifnet *, struct mbuf *, struct sockaddr *,
 100         struct rtentry *);
 101 static void faithrtrequest (int, struct rtentry *, struct rt_addrinfo *);
 102 static int faithprefix (struct in6_addr *);
 103
 104 static int faithmodevent (module_t, int, void *);
 105
 106 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
 107 LIST_HEAD(, faith_softc) faith_softc_list;
 108
 109 int     faith_clone_create (struct if_clone *, int);
 110 void    faith_clone_destroy (struct ifnet *);
 111
 112 struct if_clone faith_cloner = IF_CLONE_INITIALIZER(FAITHNAME,
 113     faith_clone_create, faith_clone_destroy, NFAITH, IF_MAXUNIT);
 114
 115 #define FAITHMTU        1500
 116
 117 static int
 118 faithmodevent(module_t mod, int type, void *data)
 119 {
 120
 121         switch (type) {
 122         case MOD_LOAD:
 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                 while (!LIST_EMPTY(&faith_softc_list))
 139                         faith_clone_destroy(
 140                             &LIST_FIRST(&faith_softc_list)->sc_if);
 141
 142                 break;
 143         }
 144         return 0;
 145 }
 146
 147 static moduledata_t faith_mod = {
 148         "if_faith",
 149         faithmodevent,
 150         0
 151 };
 152
 153 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 154 MODULE_VERSION(if_faith, 1);
 155
 156 int
 157 faith_clone_create(struct if_clone *ifc, int unit)
 158 {
 159         struct faith_softc *sc;
 160
 161         sc = kmalloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
 162
 163         sc->sc_if.if_softc = sc;
 164         if_initname(&(sc->sc_if), FAITHNAME, unit);
 165
 166         sc->sc_if.if_mtu = FAITHMTU;
 167         /* Change to BROADCAST experimentaly to announce its prefix. */
 168         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 169         sc->sc_if.if_ioctl = faithioctl;
 170         sc->sc_if.if_output = faithoutput;
 171         sc->sc_if.if_type = IFT_FAITH;
 172         sc->sc_if.if_hdrlen = 0;
 173         sc->sc_if.if_addrlen = 0;
 174         sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
 175         if_attach(&sc->sc_if, NULL);
 176         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
 177         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
 178         return (0);
 179 }
 180
 181 void
 182 faith_clone_destroy(struct ifnet *ifp)
 183 {
 184         struct faith_softc *sc = (struct faith_softc *) ifp;
 185
 186         LIST_REMOVE(sc, sc_list);
 187         bpfdetach(ifp);
 188         if_detach(ifp);
 189
 190         kfree(sc, M_FAITH);
 191 }
 192
 193 int
 194 faithoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 195             struct rtentry *rt)
 196 {
 197         int isr;
 198
 199         if ((m->m_flags & M_PKTHDR) == 0)
 200                 panic("faithoutput no HDR");
 201
 202         /* BPF write needs to be handled specially */
 203         if (dst->sa_family == AF_UNSPEC) {
 204                 dst->sa_family = *(mtod(m, int *));
 205                 m->m_len -= sizeof(int);
 206                 m->m_pkthdr.len -= sizeof(int);
 207                 m->m_data += sizeof(int);
 208         }
 209
 210         if (ifp->if_bpf != NULL) {
 211                 /*
 212                  * We need to prepend the address family as
 213                  * a four byte field.
 214                  */
 215                 uint32_t af = dst->sa_family;
 216
 217                 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
 218         }
 219
 220         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 221                 m_freem(m);
 222                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 223                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 224         }
 225         ifp->if_opackets++;
 226         ifp->if_obytes += m->m_pkthdr.len;
 227         switch (dst->sa_family) {
 228 #ifdef INET
 229         case AF_INET:
 230                 isr = NETISR_IP;
 231                 break;
 232 #endif
 233 #ifdef INET6
 234         case AF_INET6:
 235                 isr = NETISR_IPV6;
 236                 break;
 237 #endif
 238         default:
 239                 m_freem(m);
 240                 return EAFNOSUPPORT;
 241         }
 242
 243         /* XXX do we need more sanity checks? */
 244
 245         m->m_pkthdr.rcvif = ifp;
 246         ifp->if_ipackets++;
 247         ifp->if_ibytes += m->m_pkthdr.len;
 248         netisr_dispatch(isr, m);
 249         return (0);
 250 }
 251
 252 /* ARGSUSED */
 253 static void
 254 faithrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
 255 {
 256         if (rt) {
 257                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 258                 /*
 259                  * For optimal performance, the send and receive buffers
 260                  * should be at least twice the MTU plus a little more for
 261                  * overhead.
 262                  */
 263                 rt->rt_rmx.rmx_recvpipe =
 264                         rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
 265         }
 266 }
 267
 268 /*
 269  * Process an ioctl request.
 270  */
 271 /* ARGSUSED */
 272 static int
 273 faithioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 274 {
 275         struct ifaddr *ifa;
 276         struct ifreq *ifr = (struct ifreq *)data;
 277         int error = 0;
 278
 279         switch (cmd) {
 280
 281         case SIOCSIFADDR:
 282                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
 283                 ifa = (struct ifaddr *)data;
 284                 ifa->ifa_rtrequest = faithrtrequest;
 285                 /*
 286                  * Everything else is done at a higher level.
 287                  */
 288                 break;
 289
 290         case SIOCADDMULTI:
 291         case SIOCDELMULTI:
 292                 if (ifr == 0) {
 293                         error = EAFNOSUPPORT;           /* XXX */
 294                         break;
 295                 }
 296                 switch (ifr->ifr_addr.sa_family) {
 297 #ifdef INET
 298                 case AF_INET:
 299                         break;
 300 #endif
 301 #ifdef INET6
 302                 case AF_INET6:
 303                         break;
 304 #endif
 305
 306                 default:
 307                         error = EAFNOSUPPORT;
 308                         break;
 309                 }
 310                 break;
 311
 312 #ifdef SIOCSIFMTU
 313         case SIOCSIFMTU:
 314                 ifp->if_mtu = ifr->ifr_mtu;
 315                 break;
 316 #endif
 317
 318         case SIOCSIFFLAGS:
 319                 break;
 320
 321         default:
 322                 error = EINVAL;
 323         }
 324         return (error);
 325 }
 326
 327 #ifdef INET6
 328 /*
 329  * XXX could be slow
 330  * XXX could be layer violation to call sys/net from sys/netinet6
 331  */
 332 static int
 333 faithprefix(struct in6_addr *in6)
 334 {
 335         struct rtentry *rt;
 336         struct sockaddr_in6 sin6;
 337         int ret;
 338
 339         if (ip6_keepfaith == 0)
 340                 return 0;
 341
 342         bzero(&sin6, sizeof sin6);
 343         sin6.sin6_family = AF_INET6;
 344         sin6.sin6_len = sizeof(struct sockaddr_in6);
 345         sin6.sin6_addr = *in6;
 346         rt = rtpurelookup((struct sockaddr *)&sin6);
 347         if (rt != NULL && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
 348             (rt->rt_ifp->if_flags & IFF_UP))
 349                 ret = 1;
 350         else
 351                 ret = 0;
 352         if (rt != NULL)
 353                 RTFREE(rt);
 354         return ret;
 355 }
 356 #endif