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 #ifdef INET6
 103 static int faithprefix (struct in6_addr *);
 104 #endif
 105
 106 static int faithmodevent (module_t, int, void *);
 107
 108 static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");
 109 LIST_HEAD(, faith_softc) faith_softc_list;
 110
 111 int     faith_clone_create (struct if_clone *, int);
 112 void    faith_clone_destroy (struct ifnet *);
 113
 114 struct if_clone faith_cloner = IF_CLONE_INITIALIZER(FAITHNAME,
 115     faith_clone_create, faith_clone_destroy, NFAITH, IF_MAXUNIT);
 116
 117 #define FAITHMTU        1500
 118
 119 static int
 120 faithmodevent(module_t mod, int type, void *data)
 121 {
 122
 123         switch (type) {
 124         case MOD_LOAD:
 125                 LIST_INIT(&faith_softc_list);
 126                 if_clone_attach(&faith_cloner);
 127
 128 #ifdef INET6
 129                 faithprefix_p = faithprefix;
 130 #endif
 131
 132                 break;
 133         case MOD_UNLOAD:
 134 #ifdef INET6
 135                 faithprefix_p = NULL;
 136 #endif
 137
 138                 if_clone_detach(&faith_cloner);
 139
 140                 while (!LIST_EMPTY(&faith_softc_list))
 141                         faith_clone_destroy(
 142                             &LIST_FIRST(&faith_softc_list)->sc_if);
 143
 144                 break;
 145         }
 146         return 0;
 147 }
 148
 149 static moduledata_t faith_mod = {
 150         "if_faith",
 151         faithmodevent,
 152         0
 153 };
 154
 155 DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
 156 MODULE_VERSION(if_faith, 1);
 157
 158 int
 159 faith_clone_create(struct if_clone *ifc, int unit)
 160 {
 161         struct faith_softc *sc;
 162
 163         sc = kmalloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
 164
 165         sc->sc_if.if_softc = sc;
 166         if_initname(&(sc->sc_if), FAITHNAME, unit);
 167
 168         sc->sc_if.if_mtu = FAITHMTU;
 169         /* Change to BROADCAST experimentaly to announce its prefix. */
 170         sc->sc_if.if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 171         sc->sc_if.if_ioctl = faithioctl;
 172         sc->sc_if.if_output = faithoutput;
 173         sc->sc_if.if_type = IFT_FAITH;
 174         sc->sc_if.if_hdrlen = 0;
 175         sc->sc_if.if_addrlen = 0;
 176         sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
 177         if_attach(&sc->sc_if, NULL);
 178         bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
 179         LIST_INSERT_HEAD(&faith_softc_list, sc, sc_list);
 180         return (0);
 181 }
 182
 183 void
 184 faith_clone_destroy(struct ifnet *ifp)
 185 {
 186         struct faith_softc *sc = (struct faith_softc *) ifp;
 187
 188         LIST_REMOVE(sc, sc_list);
 189         bpfdetach(ifp);
 190         if_detach(ifp);
 191
 192         kfree(sc, M_FAITH);
 193 }
 194
 195 int
 196 faithoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 197             struct rtentry *rt)
 198 {
 199         int isr;
 200
 201         if ((m->m_flags & M_PKTHDR) == 0)
 202                 panic("faithoutput no HDR");
 203
 204         /* BPF write needs to be handled specially */
 205         if (dst->sa_family == AF_UNSPEC) {
 206                 dst->sa_family = *(mtod(m, int *));
 207                 m->m_len -= sizeof(int);
 208                 m->m_pkthdr.len -= sizeof(int);
 209                 m->m_data += sizeof(int);
 210         }
 211
 212         if (ifp->if_bpf != NULL) {
 213                 /*
 214                  * We need to prepend the address family as
 215                  * a four byte field.
 216                  */
 217                 uint32_t af = dst->sa_family;
 218
 219                 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
 220         }
 221
 222         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 223                 m_freem(m);
 224                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 225                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 226         }
 227         ifp->if_opackets++;
 228         ifp->if_obytes += m->m_pkthdr.len;
 229         switch (dst->sa_family) {
 230 #ifdef INET
 231         case AF_INET:
 232                 isr = NETISR_IP;
 233                 break;
 234 #endif
 235 #ifdef INET6
 236         case AF_INET6:
 237                 isr = NETISR_IPV6;
 238                 break;
 239 #endif
 240         default:
 241                 m_freem(m);
 242                 return EAFNOSUPPORT;
 243         }
 244
 245         /* XXX do we need more sanity checks? */
 246
 247         m->m_pkthdr.rcvif = ifp;
 248         ifp->if_ipackets++;
 249         ifp->if_ibytes += m->m_pkthdr.len;
 250         netisr_dispatch(isr, m);
 251         return (0);
 252 }
 253
 254 /* ARGSUSED */
 255 static void
 256 faithrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
 257 {
 258         if (rt) {
 259                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 260                 /*
 261                  * For optimal performance, the send and receive buffers
 262                  * should be at least twice the MTU plus a little more for
 263                  * overhead.
 264                  */
 265                 rt->rt_rmx.rmx_recvpipe =
 266                         rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
 267         }
 268 }
 269
 270 /*
 271  * Process an ioctl request.
 272  */
 273 /* ARGSUSED */
 274 static int
 275 faithioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 276 {
 277         struct ifaddr *ifa;
 278         struct ifreq *ifr = (struct ifreq *)data;
 279         int error = 0;
 280
 281         switch (cmd) {
 282
 283         case SIOCSIFADDR:
 284                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
 285                 ifa = (struct ifaddr *)data;
 286                 ifa->ifa_rtrequest = faithrtrequest;
 287                 /*
 288                  * Everything else is done at a higher level.
 289                  */
 290                 break;
 291
 292         case SIOCADDMULTI:
 293         case SIOCDELMULTI:
 294                 if (ifr == 0) {
 295                         error = EAFNOSUPPORT;           /* XXX */
 296                         break;
 297                 }
 298                 switch (ifr->ifr_addr.sa_family) {
 299 #ifdef INET
 300                 case AF_INET:
 301                         break;
 302 #endif
 303 #ifdef INET6
 304                 case AF_INET6:
 305                         break;
 306 #endif
 307
 308                 default:
 309                         error = EAFNOSUPPORT;
 310                         break;
 311                 }
 312                 break;
 313
 314 #ifdef SIOCSIFMTU
 315         case SIOCSIFMTU:
 316                 ifp->if_mtu = ifr->ifr_mtu;
 317                 break;
 318 #endif
 319
 320         case SIOCSIFFLAGS:
 321                 break;
 322
 323         default:
 324                 error = EINVAL;
 325         }
 326         return (error);
 327 }
 328
 329 #ifdef INET6
 330 /*
 331  * XXX could be slow
 332  * XXX could be layer violation to call sys/net from sys/netinet6
 333  */
 334 static int
 335 faithprefix(struct in6_addr *in6)
 336 {
 337         struct rtentry *rt;
 338         struct sockaddr_in6 sin6;
 339         int ret;
 340
 341         if (ip6_keepfaith == 0)
 342                 return 0;
 343
 344         bzero(&sin6, sizeof sin6);
 345         sin6.sin6_family = AF_INET6;
 346         sin6.sin6_len = sizeof(struct sockaddr_in6);
 347         sin6.sin6_addr = *in6;
 348         rt = rtpurelookup((struct sockaddr *)&sin6);
 349         if (rt != NULL && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
 350             (rt->rt_ifp->if_flags & IFF_UP))
 351                 ret = 1;
 352         else
 353                 ret = 0;
 354         if (rt != NULL)
 355                 RTFREE(rt);
 356         return ret;
 357 }
 358 #endif