bsd/net/if_dummy.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1986, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54 /*
  55  * derived from
  56  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
  57  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
  58  */
  59
  60 /*
  61  * Loopback interface driver for protocol testing and timing.
  62  */
  63 #if BSD310
  64 #include "opt_inet.h"
  65 #endif
  66 #include "dummy.h"
  67 #if NDUMMY > 0
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/kernel.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/socket.h>
  74 #include <sys/sockio.h>
  75 #include <sys/errno.h>
  76 #include <sys/time.h>
  77
  78 #include <net/if.h>
  79 #include <net/if_types.h>
  80 #include <net/route.h>
  81 #include <net/bpf.h>
  82
  83 #if     INET
  84 #include <netinet/in.h>
  85 #include <netinet/in_systm.h>
  86 #include <netinet/in_var.h>
  87 #include <netinet/ip.h>
  88 #endif
  89
  90 #if IPX
  91 #include <netipx/ipx.h>
  92 #include <netipx/ipx_if.h>
  93 #endif
  94
  95 #if INET6
  96 #ifndef INET
  97 #include <netinet/in.h>
  98 #endif
  99 #include <netinet6/in6_var.h>
 100 #include <netinet6/ip6.h>
 101 #endif
 102
 103 #if NETATALK
 104 #include <netinet/if_ether.h>
 105 #include <netatalk/at.h>
 106 #include <netatalk/at_var.h>
 107 #endif NETATALK
 108
 109 #include "bpfilter.h"
 110
 111 static int dummyioctl(struct ifnet *, u_long, caddr_t);
 112 int dummyoutput(struct ifnet *, register struct mbuf *, struct sockaddr *,
 113         register struct rtentry *);
 114 static void dummyrtrequest(int, struct rtentry *, struct sockaddr *);
 115
 116 static void dummyattach(void *);
 117 PSEUDO_SET(dummyattach, if_dummy);
 118
 119 #if TINY_DUMMYMTU
 120 #define DUMMYMTU        (1024+512)
 121 #else
 122 #define DUMMYMTU        16384
 123 #endif
 124 #define HAVE_OLD_BPF 1
 125
 126 static struct   ifnet dummyif[NDUMMY];
 127
 128 /* ARGSUSED */
 129 static void
 130 dummyattach(dummy)
 131         void *dummy;
 132 {
 133         register struct ifnet *ifp;
 134         register int i = 0;
 135
 136         for (i = 0; i < NDUMMY; i++) {
 137                 ifp = &dummyif[i];
 138 #if defined(__NetBSD__) || defined(__OpenBSD__)
 139                 sprintf(ifp->if_xname, "dummy%d", i);
 140 #else
 141                 ifp->if_name = "dummy";
 142                 ifp->if_unit = i;
 143 #endif
 144 #ifndef __bsdi__
 145                 ifp->if_softc = NULL;
 146 #endif
 147                 ifp->if_mtu = DUMMYMTU;
 148                 /* Change to BROADCAST experimentaly to announce its prefix. */
 149                 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 150                 ifp->if_ioctl = dummyioctl;
 151                 ifp->if_output = dummyoutput;
 152                 ifp->if_type = IFT_DUMMY;
 153                 ifp->if_hdrlen = 0;
 154                 ifp->if_addrlen = 0;
 155                 if_attach(ifp);
 156 #if NBPFILTER > 0
 157 #ifdef HAVE_OLD_BPF
 158                 bpfattach(ifp, DLT_NULL, sizeof(u_int));
 159 #else
 160                 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
 161 #endif
 162 #endif
 163         }
 164 }
 165
 166 int
 167 dummyoutput(ifp, m, dst, rt)
 168         struct ifnet *ifp;
 169         register struct mbuf *m;
 170         struct sockaddr *dst;
 171         register struct rtentry *rt;
 172 {
 173
 174         if ((m->m_flags & M_PKTHDR) == 0)
 175                 panic("dummyoutput no HDR");
 176 #if NBPFILTER > 0
 177         /* BPF write needs to be handled specially */
 178         if (dst->sa_family == AF_UNSPEC) {
 179                 dst->sa_family = *(mtod(m, int *));
 180                 m->m_len -= sizeof(int);
 181                 m->m_pkthdr.len -= sizeof(int);
 182                 m->m_data += sizeof(int);
 183         }
 184
 185         if (ifp->if_bpf) {
 186                 /*
 187                  * We need to prepend the address family as
 188                  * a four byte field.  Cons up a dummy header
 189                  * to pacify bpf.  This is safe because bpf
 190                  * will only read from the mbuf (i.e., it won't
 191                  * try to free it or keep a pointer a to it).
 192                  */
 193                 struct mbuf m0;
 194                 u_int af = dst->sa_family;
 195
 196                 m0.m_next = m;
 197                 m0.m_len = 4;
 198                 m0.m_data = (char *)&af;
 199
 200 #ifdef HAVE_OLD_BPF
 201                 bpf_mtap(ifp, &m0);
 202 #else
 203                 bpf_mtap(ifp->if_bpf, &m0);
 204 #endif
 205         }
 206 #endif
 207         m->m_pkthdr.rcvif = ifp;
 208
 209         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 210                 m_freem(m);
 211                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 212                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 213         }
 214         ifp->if_opackets++;
 215         ifp->if_obytes += m->m_pkthdr.len;
 216         proto_inject(dst->sa_family, m);
 217         ifp->if_ipackets++;
 218         ifp->if_ibytes += m->m_pkthdr.len;
 219         return (0);
 220 }
 221
 222 /* ARGSUSED */
 223 static void
 224 dummyrtrequest(cmd, rt, sa)
 225         int cmd;
 226         struct rtentry *rt;
 227         struct sockaddr *sa;
 228 {
 229         if (rt) {
 230                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 231                 /*
 232                  * For optimal performance, the send and receive buffers
 233                  * should be at least twice the MTU plus a little more for
 234                  * overhead.
 235                  */
 236                 rt->rt_rmx.rmx_recvpipe =
 237                         rt->rt_rmx.rmx_sendpipe = 3 * DUMMYMTU;
 238         }
 239 }
 240
 241 /*
 242  * Process an ioctl request.
 243  */
 244 /* ARGSUSED */
 245 static int
 246 dummyioctl(ifp, cmd, data)
 247         register struct ifnet *ifp;
 248         u_long cmd;
 249         caddr_t data;
 250 {
 251         register struct ifaddr *ifa;
 252         register struct ifreq *ifr = (struct ifreq *)data;
 253         register int error = 0;
 254
 255         switch (cmd) {
 256
 257         case SIOCSIFADDR:
 258                 ifnet_set_flags(ifp, IFF_UP | IFF_RUNNING, IFF_UP | IFF_RUNNING);
 259                 ifa = (struct ifaddr *)data;
 260                 ifa->ifa_rtrequest = dummyrtrequest;
 261                 /*
 262                  * Everything else is done at a higher level.
 263                  */
 264                 break;
 265
 266         case SIOCADDMULTI:
 267         case SIOCDELMULTI:
 268                 if (ifr == 0) {
 269                         error = EAFNOSUPPORT;           /* XXX */
 270                         break;
 271                 }
 272                 switch (ifr->ifr_addr.sa_family) {
 273
 274 #if INET
 275                 case AF_INET:
 276                         break;
 277 #endif
 278 #if INET6
 279                 case AF_INET6:
 280                         break;
 281 #endif
 282
 283                 default:
 284                         error = EAFNOSUPPORT;
 285                         break;
 286                 }
 287                 break;
 288
 289         case SIOCSIFMTU:
 290                 ifp->if_mtu = ifr->ifr_mtu;
 291                 break;
 292
 293         case SIOCSIFFLAGS:
 294                 break;
 295
 296         default:
 297                 error = EINVAL;
 298         }
 299         return (error);
 300 }
 301 #endif /* NDUMMY > 0 */