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 NS
 105 #include <netns/ns.h>
 106 #include <netns/ns_if.h>
 107 #endif
 108
 109 #if ISO
 110 #include <netiso/iso.h>
 111 #include <netiso/iso_var.h>
 112 #endif
 113
 114 #if NETATALK
 115 #include <netinet/if_ether.h>
 116 #include <netatalk/at.h>
 117 #include <netatalk/at_var.h>
 118 #endif NETATALK
 119
 120 #include "bpfilter.h"
 121
 122 static int dummyioctl __P((struct ifnet *, u_long, caddr_t));
 123 int dummyoutput __P((struct ifnet *, register struct mbuf *, struct sockaddr *,
 124         register struct rtentry *));
 125 static void dummyrtrequest __P((int, struct rtentry *, struct sockaddr *));
 126
 127 static void dummyattach __P((void *));
 128 PSEUDO_SET(dummyattach, if_dummy);
 129
 130 #if TINY_DUMMYMTU
 131 #define DUMMYMTU        (1024+512)
 132 #else
 133 #define DUMMYMTU        16384
 134 #endif
 135 #define HAVE_OLD_BPF 1
 136
 137 static struct   ifnet dummyif[NDUMMY];
 138
 139 /* ARGSUSED */
 140 static void
 141 dummyattach(dummy)
 142         void *dummy;
 143 {
 144         register struct ifnet *ifp;
 145         register int i = 0;
 146
 147         for (i = 0; i < NDUMMY; i++) {
 148                 ifp = &dummyif[i];
 149 #if defined(__NetBSD__) || defined(__OpenBSD__)
 150                 sprintf(ifp->if_xname, "dummy%d", i);
 151 #else
 152                 ifp->if_name = "dummy";
 153                 ifp->if_unit = i;
 154 #endif
 155 #ifndef __bsdi__
 156                 ifp->if_softc = NULL;
 157 #endif
 158                 ifp->if_mtu = DUMMYMTU;
 159                 /* Change to BROADCAST experimentaly to announce its prefix. */
 160                 ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
 161                 ifp->if_ioctl = dummyioctl;
 162                 ifp->if_output = dummyoutput;
 163                 ifp->if_type = IFT_DUMMY;
 164                 ifp->if_hdrlen = 0;
 165                 ifp->if_addrlen = 0;
 166                 if_attach(ifp);
 167 #if NBPFILTER > 0
 168 #ifdef HAVE_OLD_BPF
 169                 bpfattach(ifp, DLT_NULL, sizeof(u_int));
 170 #else
 171                 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
 172 #endif
 173 #endif
 174         }
 175 }
 176
 177 int
 178 dummyoutput(ifp, m, dst, rt)
 179         struct ifnet *ifp;
 180         register struct mbuf *m;
 181         struct sockaddr *dst;
 182         register struct rtentry *rt;
 183 {
 184         int s, isr;
 185         register struct ifqueue *ifq = 0;
 186
 187         if ((m->m_flags & M_PKTHDR) == 0)
 188                 panic("dummyoutput no HDR");
 189 #if NBPFILTER > 0
 190         /* BPF write needs to be handled specially */
 191         if (dst->sa_family == AF_UNSPEC) {
 192                 dst->sa_family = *(mtod(m, int *));
 193                 m->m_len -= sizeof(int);
 194                 m->m_pkthdr.len -= sizeof(int);
 195                 m->m_data += sizeof(int);
 196         }
 197
 198         if (ifp->if_bpf) {
 199                 /*
 200                  * We need to prepend the address family as
 201                  * a four byte field.  Cons up a dummy header
 202                  * to pacify bpf.  This is safe because bpf
 203                  * will only read from the mbuf (i.e., it won't
 204                  * try to free it or keep a pointer a to it).
 205                  */
 206                 struct mbuf m0;
 207                 u_int af = dst->sa_family;
 208
 209                 m0.m_next = m;
 210                 m0.m_len = 4;
 211                 m0.m_data = (char *)&af;
 212
 213 #ifdef HAVE_OLD_BPF
 214                 bpf_mtap(ifp, &m0);
 215 #else
 216                 bpf_mtap(ifp->if_bpf, &m0);
 217 #endif
 218         }
 219 #endif
 220         m->m_pkthdr.rcvif = ifp;
 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
 231 #if INET
 232         case AF_INET:
 233                 ifq = &ipintrq;
 234                 isr = NETISR_IP;
 235                 break;
 236 #endif
 237 #if IPX
 238         case AF_IPX:
 239                 ifq = &ipxintrq;
 240                 isr = NETISR_IPX;
 241                 break;
 242 #endif
 243 #if INET6
 244         case AF_INET6:
 245                 ifq = &ip6intrq;
 246                 isr = NETISR_IPV6;
 247                 break;
 248 #endif
 249 #if NS
 250         case AF_NS:
 251                 ifq = &nsintrq;
 252                 isr = NETISR_NS;
 253                 break;
 254 #endif
 255 #if ISO
 256         case AF_ISO:
 257                 ifq = &clnlintrq;
 258                 isr = NETISR_ISO;
 259                 break;
 260 #endif
 261 #if NETATALK
 262         case AF_APPLETALK:
 263                 ifq = &atintrq2;
 264                 isr = NETISR_ATALK;
 265                 break;
 266 #endif NETATALK
 267         default:
 268                 printf("%s: can't handle af%d\n",
 269                        if_name(ifp), dst->sa_family);
 270                 m_freem(m);
 271                 return (EAFNOSUPPORT);
 272         }
 273         s = splimp();
 274         if (IF_QFULL(ifq)) {
 275                 IF_DROP(ifq);
 276                 m_freem(m);
 277                 splx(s);
 278                 return (ENOBUFS);
 279         }
 280         IF_ENQUEUE(ifq, m);
 281         schednetisr(isr);
 282         ifp->if_ipackets++;
 283         ifp->if_ibytes += m->m_pkthdr.len;
 284         splx(s);
 285         return (0);
 286 }
 287
 288 /* ARGSUSED */
 289 static void
 290 dummyrtrequest(cmd, rt, sa)
 291         int cmd;
 292         struct rtentry *rt;
 293         struct sockaddr *sa;
 294 {
 295         if (rt) {
 296                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 297                 /*
 298                  * For optimal performance, the send and receive buffers
 299                  * should be at least twice the MTU plus a little more for
 300                  * overhead.
 301                  */
 302                 rt->rt_rmx.rmx_recvpipe =
 303                         rt->rt_rmx.rmx_sendpipe = 3 * DUMMYMTU;
 304         }
 305 }
 306
 307 /*
 308  * Process an ioctl request.
 309  */
 310 /* ARGSUSED */
 311 static int
 312 dummyioctl(ifp, cmd, data)
 313         register struct ifnet *ifp;
 314         u_long cmd;
 315         caddr_t data;
 316 {
 317         register struct ifaddr *ifa;
 318         register struct ifreq *ifr = (struct ifreq *)data;
 319         register int error = 0;
 320
 321         switch (cmd) {
 322
 323         case SIOCSIFADDR:
 324                 ifp->if_flags |= IFF_UP | IFF_RUNNING;
 325                 ifa = (struct ifaddr *)data;
 326                 ifa->ifa_rtrequest = dummyrtrequest;
 327                 /*
 328                  * Everything else is done at a higher level.
 329                  */
 330                 break;
 331
 332         case SIOCADDMULTI:
 333         case SIOCDELMULTI:
 334                 if (ifr == 0) {
 335                         error = EAFNOSUPPORT;           /* XXX */
 336                         break;
 337                 }
 338                 switch (ifr->ifr_addr.sa_family) {
 339
 340 #if INET
 341                 case AF_INET:
 342                         break;
 343 #endif
 344 #if INET6
 345                 case AF_INET6:
 346                         break;
 347 #endif
 348
 349                 default:
 350                         error = EAFNOSUPPORT;
 351                         break;
 352                 }
 353                 break;
 354
 355         case SIOCSIFMTU:
 356                 ifp->if_mtu = ifr->ifr_mtu;
 357                 break;
 358
 359         case SIOCSIFFLAGS:
 360                 break;
 361
 362         default:
 363                 error = EINVAL;
 364         }
 365         return (error);
 366 }
 367 #endif /* NDUMMY > 0 */