bsd/net/if_faith.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 /*      $KAME: if_faith.c,v 1.21 2001/02/20 07:59:26 itojun Exp $       */
  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  * $FreeBSD: src/sys/net/if_faith.c,v 1.3.2.2 2001/07/05 14:46:25 ume Exp $
  63  */
  64 /*
  65  * derived from
  66  *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
  67  * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
  68  */
  69
  70 /*
  71  * Loopback interface driver for protocol testing and timing.
  72  */
  73
  74 #include "faith.h"
  75 #if NFAITH > 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/errno.h>
  83 #include <sys/sockio.h>
  84 #include <sys/time.h>
  85 #include <sys/queue.h>
  86
  87 #include <net/if.h>
  88 #include <net/if_types.h>
  89 #include <net/route.h>
  90 #include <net/bpf.h>
  91 #include <net/if_faith.h>
  92
  93 #if     INET
  94 #include <netinet/in.h>
  95 #include <netinet/in_systm.h>
  96 #include <netinet/in_var.h>
  97 #include <netinet/ip.h>
  98 #endif
  99
 100 #if INET6
 101 #ifndef INET
 102 #include <netinet/in.h>
 103 #endif
 104 #include <netinet6/in6_var.h>
 105 #include <netinet/ip6.h>
 106 #include <netinet6/ip6_var.h>
 107 #endif
 108
 109 #include <net/dlil.h>
 110 #include "bpf.h"
 111
 112 #include <net/net_osdep.h>
 113
 114 static int faithioctl(struct ifnet *, u_long, void*);
 115 int faith_pre_output(struct ifnet *, register struct mbuf **,
 116         const struct sockaddr *, caddr_t, char *, char *, u_long);
 117 static void faithrtrequest(int, struct rtentry *, struct sockaddr *);
 118
 119 void faithattach(void);
 120 #ifndef __APPLE__
 121 PSEUDO_SET(faithattach, if_faith);
 122 #endif
 123
 124 static struct ifnet faithif[NFAITH];
 125 static struct if_proto *faith_array[NFAITH];
 126 static int faith_count = 0;
 127
 128 #define FAITHMTU        1500
 129
 130 static
 131 int  faith_add_if(struct ifnet *ifp)
 132 {
 133     ifp->if_demux  = 0;
 134     ifp->if_framer = 0;
 135     return 0;
 136 }
 137
 138 static
 139 int  faith_del_if(struct ifnet *ifp)
 140 {
 141     return 0;
 142 }
 143
 144 static
 145 int  faith_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag)
 146 {
 147     int i;
 148
 149     for (i=0; i < faith_count; i++)
 150         if (faith_array[i] == 0) {
 151             faith_array[faith_count] = proto;
 152             return 0;
 153         }
 154
 155     if ((i == faith_count) && (faith_count == NFAITH))
 156        panic("faith_add_proto -- Too many attachments\n");
 157
 158     faith_array[faith_count++] = proto;
 159
 160     return (0);
 161 }
 162
 163 static
 164 int  faith_del_proto(struct if_proto *proto, u_long dl_tag)
 165 {
 166     int i;
 167
 168
 169     for (i=0; i < faith_count; i++)
 170         if (faith_array[i] == proto) {
 171             faith_array[i] = 0;
 172             return 0;
 173         }
 174
 175     return ENOENT;
 176 }
 177
 178 int faith_shutdown()
 179 {
 180     return 0;
 181 }
 182
 183 int  faith_attach_inet(struct ifnet *ifp, u_long *dl_tag)
 184 {
 185     struct dlil_proto_reg_str   reg;
 186     struct dlil_demux_desc      desc;
 187     short native=0;
 188     int   stat;
 189     int i;
 190
 191     for (i=0; i < faith_count; i++) {
 192         if (faith_array[i] && (faith_array[i]->ifp == ifp) &&
 193             (faith_array[i]->protocol_family == PF_INET)) {
 194 #if 0
 195                 kprintf("faith_array for %s%d found dl_tag=%d\n",
 196                        ifp->if_name, ifp->if_unit, faith_array[i]->dl_tag);
 197 #endif
 198                 *dl_tag = faith_array[i]->dl_tag;
 199                 return 0;
 200
 201         }
 202     }
 203
 204         bzero(&reg, sizeof(reg));
 205         bzero(&desc, sizeof(desc));
 206     TAILQ_INIT(&reg.demux_desc_head);
 207     desc.type = DLIL_DESC_RAW;
 208     desc.native_type = (char *) &native;
 209     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
 210     reg.interface_family = ifp->if_family;
 211     reg.unit_number      = ifp->if_unit;
 212     reg.pre_output       = faith_pre_output;
 213     reg.protocol_family  = PF_INET;
 214
 215     stat = dlil_attach_protocol(&reg, dl_tag);
 216     if (stat) {
 217         panic("faith_attach_inet can't attach interface\n");
 218     }
 219
 220     return stat;
 221 }
 222
 223 void faith_reg_if_mods()
 224 {
 225      struct dlil_ifmod_reg_str  faith_ifmod;
 226      struct dlil_protomod_reg_str faith_protoreg;
 227      int error;
 228
 229      bzero(&faith_ifmod, sizeof(faith_ifmod));
 230      faith_ifmod.add_if = faith_add_if;
 231      faith_ifmod.del_if = faith_del_if;
 232      faith_ifmod.add_proto = faith_add_proto;
 233      faith_ifmod.del_proto = faith_del_proto;
 234      faith_ifmod.ifmod_ioctl = 0;
 235      faith_ifmod.shutdown    = faith_shutdown;
 236
 237
 238     if (dlil_reg_if_modules(APPLE_IF_FAM_FAITH, &faith_ifmod))
 239         panic("Couldn't register faith modules\n");
 240
 241         /* Register protocol registration functions */
 242
 243         bzero(&faith_protoreg, sizeof(faith_protoreg));
 244         faith_protoreg.attach_proto = faith_attach_inet;
 245         faith_protoreg.detach_proto = 0;
 246
 247         if ( error = dlil_reg_proto_module(PF_INET, APPLE_IF_FAM_FAITH, &faith_protoreg) != 0)
 248                 kprintf("dlil_reg_proto_module failed for AF_INET error=%d\n", error);
 249
 250
 251 }
 252
 253 void
 254 faithattach(void)
 255 {
 256         struct ifnet *ifp;
 257         int i;
 258
 259         faith_reg_if_mods(); /* DLIL modules */
 260
 261         for (i = 0; i < NFAITH; i++) {
 262                 ifp = &faithif[i];
 263                 bzero(ifp, sizeof(faithif[i]));
 264                 ifp->if_name = "faith";
 265                 ifp->if_unit = i;
 266                 ifp->if_family = APPLE_IF_FAM_FAITH;
 267                 ifp->if_mtu = FAITHMTU;
 268                 /* LOOPBACK commented out to announce IPv6 routes to faith */
 269                 ifp->if_flags = /* IFF_LOOPBACK | */ IFF_MULTICAST;
 270                 ifp->if_ioctl = faithioctl;
 271                 ifp->if_output = NULL;
 272                 ifp->if_type = IFT_FAITH;
 273                 ifp->if_hdrlen = 0;
 274                 ifp->if_addrlen = 0;
 275                 dlil_if_attach(ifp);
 276 #if NBPFILTER > 0
 277 #ifdef HAVE_OLD_BPF
 278                 bpfattach(ifp, DLT_NULL, sizeof(u_int));
 279 #else
 280                 bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
 281 #endif
 282 #endif
 283         }
 284 }
 285
 286 int
 287 faith_pre_output(ifp, m0, dst, route_entry, frame_type, dst_addr, dl_tag)
 288         struct ifnet *ifp;
 289         register struct mbuf **m0;
 290         const struct sockaddr *dst;
 291         caddr_t                  route_entry;
 292         char                 *frame_type;
 293         char                 *dst_addr;
 294         u_long               dl_tag;
 295 {
 296         register struct mbuf *m = *m0;
 297         struct rtentry *rt = (struct rtentry*)route_entry;
 298
 299         if ((m->m_flags & M_PKTHDR) == 0)
 300                 panic("faithoutput no HDR");
 301 #if NBPFILTER > 0
 302         /* BPF write needs to be handled specially */
 303         if (dst && dst->sa_family == AF_UNSPEC) {
 304                 dst->sa_family = *(mtod(m, int *));
 305                 m->m_len -= sizeof(int);
 306                 m->m_pkthdr.len -= sizeof(int);
 307                 m->m_data += sizeof(int);
 308         }
 309
 310         if (ifp->if_bpf) {
 311                 /*
 312                  * We need to prepend the address family as
 313                  * a four byte field.  Cons up a faith header
 314                  * to pacify bpf.  This is safe because bpf
 315                  * will only read from the mbuf (i.e., it won't
 316                  * try to free it or keep a pointer a to it).
 317                  */
 318                 struct mbuf m0;
 319                 u_int32_t af = dst->sa_family;
 320
 321                 m0.m_next = m;
 322                 m0.m_len = 4;
 323                 m0.m_data = (char *)&af;
 324
 325 #ifdef HAVE_OLD_BPF
 326                 bpf_mtap(ifp, &m0);
 327 #else
 328                 bpf_mtap(ifp->if_bpf, &m0);
 329 #endif
 330         }
 331 #endif
 332
 333         if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
 334                 return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
 335                         rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
 336         }
 337         ifp->if_opackets++;
 338         ifp->if_obytes += m->m_pkthdr.len;
 339         m->m_pkthdr.rcvif = ifp;
 340         proto_inject(dst->sa_family, m);
 341         ifp->if_ipackets++;
 342         ifp->if_ibytes += m->m_pkthdr.len;
 343         return (EJUSTRETURN);
 344 }
 345
 346 /* ARGSUSED */
 347 static void
 348 faithrtrequest(cmd, rt, sa)
 349         int cmd;
 350         struct rtentry *rt;
 351         struct sockaddr *sa;
 352 {
 353         if (rt) {
 354                 rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
 355                 /*
 356                  * For optimal performance, the send and receive buffers
 357                  * should be at least twice the MTU plus a little more for
 358                  * overhead.
 359                  */
 360                 rt->rt_rmx.rmx_recvpipe =
 361                         rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
 362         }
 363 }
 364
 365 /*
 366  * Process an ioctl request.
 367  */
 368 /* ARGSUSED */
 369 static int
 370 faithioctl(ifp, cmd, data)
 371         struct ifnet *ifp;
 372         u_long cmd;
 373         void* data;
 374 {
 375         struct ifaddr *ifa;
 376         struct ifreq *ifr = (struct ifreq *)data;
 377         int error = 0;
 378
 379         switch (cmd) {
 380
 381         case SIOCSIFADDR:
 382                 ifnet_set_flags(ifp, IFF_UP | IFF_RUNNING, IFF_UP | IFF_RUNNING);
 383                 ifa = (struct ifaddr *)data;
 384                 ifa->ifa_rtrequest = faithrtrequest;
 385                 /*
 386                  * Everything else is done at a higher level.
 387                  */
 388                 break;
 389
 390         case SIOCADDMULTI:
 391         case SIOCDELMULTI:
 392                 if (ifr == 0) {
 393                         error = EAFNOSUPPORT;           /* XXX */
 394                         break;
 395                 }
 396                 switch (ifr->ifr_addr.sa_family) {
 397 #if INET
 398                 case AF_INET:
 399                         break;
 400 #endif
 401 #if INET6
 402                 case AF_INET6:
 403                         break;
 404 #endif
 405
 406                 default:
 407                         error = EAFNOSUPPORT;
 408                         break;
 409                 }
 410                 break;
 411
 412 #ifdef SIOCSIFMTU
 413         case SIOCSIFMTU:
 414                 ifp->if_mtu = ifr->ifr_mtu;
 415                 break;
 416 #endif
 417
 418         case SIOCSIFFLAGS:
 419                 break;
 420
 421         default:
 422                 error = EINVAL;
 423         }
 424         return (error);
 425 }
 426
 427 #if INET6
 428 /*
 429  * XXX could be slow
 430  * XXX could be layer violation to call sys/net from sys/netinet6
 431  */
 432 int
 433 faithprefix(in6)
 434         struct in6_addr *in6;
 435 {
 436         struct rtentry *rt;
 437         struct sockaddr_in6 sin6;
 438         int ret;
 439
 440         if (ip6_keepfaith == 0)
 441                 return 0;
 442
 443         bzero(&sin6, sizeof(sin6));
 444         sin6.sin6_family = AF_INET6;
 445         sin6.sin6_len = sizeof(struct sockaddr_in6);
 446         sin6.sin6_addr = *in6;
 447         rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
 448         if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
 449             (rt->rt_ifp->if_flags & IFF_UP) != 0)
 450                 ret = 1;
 451         else
 452                 ret = 0;
 453         if (rt)
 454                 rtfree(rt);
 455         return ret;
 456 }
 457 #endif
 458 #endif /* NFAITH > 0 */