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/netisr.h>
  81 #include <net/route.h>
  82 #include <net/bpf.h>
  83
  84 #if     INET
  85 #include <netinet/in.h>
  86 #include <netinet/in_systm.h>
  87 #include <netinet/in_var.h>
  88 #include <netinet/ip.h>
  89 #endif
  90
  91 #if IPX
  92 #include <netipx/ipx.h>
  93 #include <netipx/ipx_if.h>
  94 #endif
  95
  96 #if INET6
  97 #ifndef INET
  98 #include <netinet/in.h>
  99 #endif
 100 #include <netinet6/in6_var.h>
 101 #include <netinet6/ip6.h>
 102 #endif
 103
 104 #if NETATALK
 105 #include <netinet/if_ether.h>
 106 #include <netatalk/at.h>
 107 #include <netatalk/at_var.h>
 108 #endif NETATALK
 109
 110 #include "bpfilter.h"
 111
 112 static int dummyioctl __P((struct ifnet *, u_long, caddr_t));
 113 int dummyoutput __P((struct ifnet *, register struct mbuf *, struct sockaddr *,
 114         register struct rtentry *));
 115 static void dummyrtrequest __P((int, struct rtentry *, struct sockaddr *));
 116
 117 static void dummyattach __P((void *));
 118 PSEUDO_SET(dummyattach, if_dummy);
 119
 120 #if TINY_DUMMYMTU
 121 #define DUMMYMTU        (1024+512)
 122 #else
 123 #define DUMMYMTU        16384
 124 #endif
 125 #define HAVE_OLD_BPF 1
 126
 127 static struct   ifnet dummyif[NDUMMY];
 128
 129 /* ARGSUSED */
 130 static void
 131 dummyattach(dummy)
 132         void *dummy;
 133 {
 134         register struct ifnet *ifp;
 135         register int i = 0;
 136
 137         for (i = 0; i < NDUMMY; i++) {
 138                 ifp = &dummyif[i];
 139 #if defined(__NetBSD__) || defined(__OpenBSD__)
 140                 sprintf(ifp->if_xname, "dummy%d", i);
 141 #else
 142                 ifp->if_name = "dummy";
 143                 ifp->if_unit = i;
 144 #endif
 145 #ifndef __bsdi__
 146                 ifp->if_softc = NULL;
 147 #endif
 148                 ifp->if_mtu = DUMMYMTU;
 149                 /* Change to BROADCAST experimentaly to announce its prefix. */
 150                 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 151                 ifp->if_ioctl = dummyioctl;
 152                 ifp->if_output = dummyoutput;
 153                 ifp->if_type = IFT_DUMMY;
 154                 ifp->if_hdrlen = 0;
 155                 ifp->if_addrlen = 0;
 156                 if_attach(ifp);
 157 #if NBPFILTER > 0
 158 #ifdef HAVE_OLD_BPF
 159                 bpfattach(ifp, DLT_NULL, sizeof(u_int));
 160 #else
 161                 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
 162 #endif
 163 #endif
 164         }
 165 }
 166
 167 int
 168 dummyoutput(ifp, m, dst, rt)
 169         struct ifnet *ifp;
 170         register struct mbuf *m;
 171         struct sockaddr *dst;
 172         register struct rtentry *rt;
 173 {
 174         int s, isr;
 175         register struct ifqueue *ifq = 0;
 176
 177         if ((m->m_flags & M_PKTHDR) == 0)
 178                 panic("dummyoutput no HDR");
 179 #if NBPFILTER > 0
 180         /* BPF write needs to be handled specially */
 181         if (dst->sa_family == AF_UNSPEC) {
 182                 dst->sa_family = *(mtod(m, int *));
 183                 m->m_len -= sizeof(int);
 184                 m->m_pkthdr.len -= sizeof(int);
 185                 m->m_data += sizeof(int);
 186         }
 187
 188         if (ifp->if_bpf) {
 189                 /*
 190                  * We need to prepend the address family as
 191                  * a four byte field.  Cons up a dummy header
 192                  * to pacify bpf.  This is safe because bpf
 193                  * will only read from the mbuf (i.e., it won't
 194                  * try to free it or keep a pointer a to it).
 195                  */
 196                 struct mbuf m0;
 197                 u_int af = dst->sa_family;
 198
 199                 m0.m_next = m;
 200                 m0.m_len = 4;
 201                 m0.m_data = (char *)&af;
 202
 203 #ifdef HAVE_OLD_BPF
 204                 bpf_mtap(ifp, &m0);
 205 #else
 206                 bpf_mtap(ifp->if_bpf, &m0);
 207 #endif
 208         }
 209 #endif
 210         m->m_pkthdr.rcvif = ifp;
 211
 212         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 213                 m_freem(m);
 214                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 215                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 216         }
 217         ifp->if_opackets++;
 218         ifp->if_obytes += m->m_pkthdr.len;
 219         switch (dst->sa_family) {
 220
 221 #if INET
 222         case AF_INET:
 223                 ifq = &ipintrq;
 224                 isr = NETISR_IP;
 225                 break;
 226 #endif
 227 #if IPX
 228         case AF_IPX:
 229                 ifq = &ipxintrq;
 230                 isr = NETISR_IPX;
 231                 break;
 232 #endif
 233 #if INET6
 234         case AF_INET6:
 235                 ifq = &ip6intrq;
 236                 isr = NETISR_IPV6;
 237                 break;
 238 #endif
 239 #if NS
 240         case AF_NS:
 241                 ifq = &nsintrq;
 242                 isr = NETISR_NS;
 243                 break;
 244 #endif
 245 #if ISO
 246         case AF_ISO:
 247                 ifq = &clnlintrq;
 248                 isr = NETISR_ISO;
 249                 break;
 250 #endif
 251 #if NETATALK
 252         case AF_APPLETALK:
 253                 ifq = &atintrq2;
 254                 isr = NETISR_ATALK;
 255                 break;
 256 #endif NETATALK
 257         default:
 258                 printf("%s: can't handle af%d\n",
 259                        if_name(ifp), dst->sa_family);
 260                 m_freem(m);
 261                 return (EAFNOSUPPORT);
 262         }
 263         s = splimp();
 264         if (IF_QFULL(ifq)) {
 265                 IF_DROP(ifq);
 266                 m_freem(m);
 267                 splx(s);
 268                 return (ENOBUFS);
 269         }
 270         IF_ENQUEUE(ifq, m);
 271         schednetisr(isr);
 272         ifp->if_ipackets++;
 273         ifp->if_ibytes += m->m_pkthdr.len;
 274         splx(s);
 275         return (0);
 276 }
 277
 278 /* ARGSUSED */
 279 static void
 280 dummyrtrequest(cmd, rt, sa)
 281         int cmd;
 282         struct rtentry *rt;
 283         struct sockaddr *sa;
 284 {
 285         if (rt) {
 286                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 287                 /*
 288                  * For optimal performance, the send and receive buffers
 289                  * should be at least twice the MTU plus a little more for
 290                  * overhead.
 291                  */
 292                 rt->rt_rmx.rmx_recvpipe =
 293                         rt->rt_rmx.rmx_sendpipe = 3 * DUMMYMTU;
 294         }
 295 }
 296
 297 /*
 298  * Process an ioctl request.
 299  */
 300 /* ARGSUSED */
 301 static int
 302 dummyioctl(ifp, cmd, data)
 303         register struct ifnet *ifp;
 304         u_long cmd;
 305         caddr_t data;
 306 {
 307         register struct ifaddr *ifa;
 308         register struct ifreq *ifr = (struct ifreq *)data;
 309         register int error = 0;
 310
 311         switch (cmd) {
 312
 313         case SIOCSIFADDR:
 314                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
 315                 ifa = (struct ifaddr *)data;
 316                 ifa->ifa_rtrequest = dummyrtrequest;
 317                 /*
 318                  * Everything else is done at a higher level.
 319                  */
 320                 break;
 321
 322         case SIOCADDMULTI:
 323         case SIOCDELMULTI:
 324                 if (ifr == 0) {
 325                         error = EAFNOSUPPORT;           /* XXX */
 326                         break;
 327                 }
 328                 switch (ifr->ifr_addr.sa_family) {
 329
 330 #if INET
 331                 case AF_INET:
 332                         break;
 333 #endif
 334 #if INET6
 335                 case AF_INET6:
 336                         break;
 337 #endif
 338
 339                 default:
 340                         error = EAFNOSUPPORT;
 341                         break;
 342                 }
 343                 break;
 344
 345         case SIOCSIFMTU:
 346                 ifp->if_mtu = ifr->ifr_mtu;
 347                 break;
 348
 349         case SIOCSIFFLAGS:
 350                 break;
 351
 352         default:
 353                 error = EINVAL;
 354         }
 355         return (error);
 356 }
 357 #endif /* NDUMMY > 0 */