bsd/net/if_dummy.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * Copyright (c) 1982, 1986, 1993
  32  *      The Regents of the University of California.  All rights reserved.
  33  *
  34  * Redistribution and use in source and binary forms, with or without
  35  * modification, are permitted provided that the following conditions
  36  * are met:
  37  * 1. Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  * 2. Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in the
  41  *    documentation and/or other materials provided with the distribution.
  42  * 3. All advertising materials mentioning features or use of this software
  43  *    must display the following acknowledgement:
  44  *      This product includes software developed by the University of
  45  *      California, Berkeley and its contributors.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62 /*
  63  * derived from
  64  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
  65  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
  66  */
  67
  68 /*
  69  * Loopback interface driver for protocol testing and timing.
  70  */
  71 #if BSD310
  72 #include "opt_inet.h"
  73 #endif
  74 #include "dummy.h"
  75 #if NDUMMY > 0
  76
  77 #include <sys/param.h>
  78 #include <sys/systm.h>
  79 #include <sys/kernel.h>
  80 #include <sys/mbuf.h>
  81 #include <sys/socket.h>
  82 #include <sys/sockio.h>
  83 #include <sys/errno.h>
  84 #include <sys/time.h>
  85
  86 #include <net/if.h>
  87 #include <net/if_types.h>
  88 #include <net/route.h>
  89 #include <net/bpf.h>
  90
  91 #if     INET
  92 #include <netinet/in.h>
  93 #include <netinet/in_systm.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/ip.h>
  96 #endif
  97
  98 #if IPX
  99 #include <netipx/ipx.h>
 100 #include <netipx/ipx_if.h>
 101 #endif
 102
 103 #if INET6
 104 #ifndef INET
 105 #include <netinet/in.h>
 106 #endif
 107 #include <netinet6/in6_var.h>
 108 #include <netinet6/ip6.h>
 109 #endif
 110
 111 #if NETATALK
 112 #include <netinet/if_ether.h>
 113 #include <netatalk/at.h>
 114 #include <netatalk/at_var.h>
 115 #endif NETATALK
 116
 117 #include "bpfilter.h"
 118
 119 static int dummyioctl(struct ifnet *, u_long, caddr_t);
 120 int dummyoutput(struct ifnet *, register struct mbuf *, struct sockaddr *,
 121         register struct rtentry *);
 122 static void dummyrtrequest(int, struct rtentry *, struct sockaddr *);
 123
 124 static void dummyattach(void *);
 125 PSEUDO_SET(dummyattach, if_dummy);
 126
 127 #if TINY_DUMMYMTU
 128 #define DUMMYMTU        (1024+512)
 129 #else
 130 #define DUMMYMTU        16384
 131 #endif
 132 #define HAVE_OLD_BPF 1
 133
 134 static struct   ifnet dummyif[NDUMMY];
 135
 136 /* ARGSUSED */
 137 static void
 138 dummyattach(dummy)
 139         void *dummy;
 140 {
 141         register struct ifnet *ifp;
 142         register int i = 0;
 143
 144         for (i = 0; i < NDUMMY; i++) {
 145                 ifp = &dummyif[i];
 146 #if defined(__NetBSD__) || defined(__OpenBSD__)
 147                 sprintf(ifp->if_xname, "dummy%d", i);
 148 #else
 149                 ifp->if_name = "dummy";
 150                 ifp->if_unit = i;
 151 #endif
 152 #ifndef __bsdi__
 153                 ifp->if_softc = NULL;
 154 #endif
 155                 ifp->if_mtu = DUMMYMTU;
 156                 /* Change to BROADCAST experimentaly to announce its prefix. */
 157                 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 158                 ifp->if_ioctl = dummyioctl;
 159                 ifp->if_output = dummyoutput;
 160                 ifp->if_type = IFT_DUMMY;
 161                 ifp->if_hdrlen = 0;
 162                 ifp->if_addrlen = 0;
 163                 if_attach(ifp);
 164 #if NBPFILTER > 0
 165 #ifdef HAVE_OLD_BPF
 166                 bpfattach(ifp, DLT_NULL, sizeof(u_int));
 167 #else
 168                 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
 169 #endif
 170 #endif
 171         }
 172 }
 173
 174 int
 175 dummyoutput(ifp, m, dst, rt)
 176         struct ifnet *ifp;
 177         register struct mbuf *m;
 178         struct sockaddr *dst;
 179         register struct rtentry *rt;
 180 {
 181
 182         if ((m->m_flags & M_PKTHDR) == 0)
 183                 panic("dummyoutput no HDR");
 184 #if NBPFILTER > 0
 185         /* BPF write needs to be handled specially */
 186         if (dst->sa_family == AF_UNSPEC) {
 187                 dst->sa_family = *(mtod(m, int *));
 188                 m->m_len -= sizeof(int);
 189                 m->m_pkthdr.len -= sizeof(int);
 190                 m->m_data += sizeof(int);
 191         }
 192
 193         if (ifp->if_bpf) {
 194                 /*
 195                  * We need to prepend the address family as
 196                  * a four byte field.  Cons up a dummy header
 197                  * to pacify bpf.  This is safe because bpf
 198                  * will only read from the mbuf (i.e., it won't
 199                  * try to free it or keep a pointer a to it).
 200                  */
 201                 struct mbuf m0;
 202                 u_int af = dst->sa_family;
 203
 204                 m0.m_next = m;
 205                 m0.m_len = 4;
 206                 m0.m_data = (char *)&af;
 207
 208 #ifdef HAVE_OLD_BPF
 209                 bpf_mtap(ifp, &m0);
 210 #else
 211                 bpf_mtap(ifp->if_bpf, &m0);
 212 #endif
 213         }
 214 #endif
 215         m->m_pkthdr.rcvif = ifp;
 216
 217         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 218                 m_freem(m);
 219                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 220                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 221         }
 222         ifp->if_opackets++;
 223         ifp->if_obytes += m->m_pkthdr.len;
 224         proto_inject(dst->sa_family, m);
 225         ifp->if_ipackets++;
 226         ifp->if_ibytes += m->m_pkthdr.len;
 227         return (0);
 228 }
 229
 230 /* ARGSUSED */
 231 static void
 232 dummyrtrequest(cmd, rt, sa)
 233         int cmd;
 234         struct rtentry *rt;
 235         struct sockaddr *sa;
 236 {
 237         if (rt) {
 238                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 239                 /*
 240                  * For optimal performance, the send and receive buffers
 241                  * should be at least twice the MTU plus a little more for
 242                  * overhead.
 243                  */
 244                 rt->rt_rmx.rmx_recvpipe =
 245                         rt->rt_rmx.rmx_sendpipe = 3 * DUMMYMTU;
 246         }
 247 }
 248
 249 /*
 250  * Process an ioctl request.
 251  */
 252 /* ARGSUSED */
 253 static int
 254 dummyioctl(ifp, cmd, data)
 255         register struct ifnet *ifp;
 256         u_long cmd;
 257         caddr_t data;
 258 {
 259         register struct ifaddr *ifa;
 260         register struct ifreq *ifr = (struct ifreq *)data;
 261         register int error = 0;
 262
 263         switch (cmd) {
 264
 265         case SIOCSIFADDR:
 266                 ifnet_set_flags(ifp, IFF_UP | IFF_RUNNING, IFF_UP | IFF_RUNNING);
 267                 ifa = (struct ifaddr *)data;
 268                 ifa->ifa_rtrequest = dummyrtrequest;
 269                 /*
 270                  * Everything else is done at a higher level.
 271                  */
 272                 break;
 273
 274         case SIOCADDMULTI:
 275         case SIOCDELMULTI:
 276                 if (ifr == 0) {
 277                         error = EAFNOSUPPORT;           /* XXX */
 278                         break;
 279                 }
 280                 switch (ifr->ifr_addr.sa_family) {
 281
 282 #if INET
 283                 case AF_INET:
 284                         break;
 285 #endif
 286 #if INET6
 287                 case AF_INET6:
 288                         break;
 289 #endif
 290
 291                 default:
 292                         error = EAFNOSUPPORT;
 293                         break;
 294                 }
 295                 break;
 296
 297         case SIOCSIFMTU:
 298                 ifp->if_mtu = ifr->ifr_mtu;
 299                 break;
 300
 301         case SIOCSIFFLAGS:
 302                 break;
 303
 304         default:
 305                 error = EINVAL;
 306         }
 307         return (error);
 308 }
 309 #endif /* NDUMMY > 0 */