bsd/net/if_dummy.c

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