bsd/net/ether_inet_pr_module.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, 1989, 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
  56
  57
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <sys/kernel.h>
  61 #include <sys/malloc.h>
  62 #include <sys/mbuf.h>
  63 #include <sys/socket.h>
  64 #include <sys/sockio.h>
  65 #include <sys/sysctl.h>
  66
  67 #include <net/if.h>
  68 #include <net/netisr.h>
  69 #include <net/route.h>
  70 #include <net/if_llc.h>
  71 #include <net/if_dl.h>
  72 #include <net/if_types.h>
  73
  74 #include <netinet/in.h>
  75 #include <netinet/in_var.h>
  76 #include <netinet/if_ether.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/ip.h>
  79
  80 #include <sys/socketvar.h>
  81
  82 #include <net/dlil.h>
  83
  84 #if LLC && CCITT
  85 extern struct ifqueue pkintrq;
  86 #endif
  87
  88
  89 #if BRIDGE
  90 #include <net/bridge.h>
  91 #endif
  92
  93 /* #include "vlan.h" */
  94 #if NVLAN > 0
  95 #include <net/if_vlan_var.h>
  96 #endif /* NVLAN > 0 */
  97
  98 static u_long lo_dlt = 0;
  99 static ivedonethis = 0;
 100 static u_char   etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 101
 102 #define IFP2AC(IFP) ((struct arpcom *)IFP)
 103
 104
 105
 106
 107 /*
 108  * Process a received Ethernet packet;
 109  * the packet is in the mbuf chain m without
 110  * the ether header, which is provided separately.
 111  */
 112 int
 113 inet_ether_input(m, frame_header, ifp, dl_tag, sync_ok)
 114     struct mbuf  *m;
 115     char         *frame_header;
 116     struct ifnet *ifp;
 117     u_long           dl_tag;
 118     int          sync_ok;
 119
 120 {
 121     register struct ether_header *eh = (struct ether_header *) frame_header;
 122     register struct ifqueue *inq=0;
 123     u_short ether_type;
 124     int s;
 125     u_int16_t ptype = -1;
 126     unsigned char buf[18];
 127
 128 #if ISO || LLC || NETAT
 129     register struct llc *l;
 130 #endif
 131
 132     if ((ifp->if_flags & IFF_UP) == 0) {
 133          m_freem(m);
 134          return EJUSTRETURN;
 135     }
 136
 137     ifp->if_lastchange = time;
 138
 139     if (eh->ether_dhost[0] & 1) {
 140         if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
 141                  sizeof(etherbroadcastaddr)) == 0)
 142             m->m_flags |= M_BCAST;
 143         else
 144             m->m_flags |= M_MCAST;
 145     }
 146     if (m->m_flags & (M_BCAST|M_MCAST))
 147         ifp->if_imcasts++;
 148
 149     ether_type = ntohs(eh->ether_type);
 150
 151 #if NVLAN > 0
 152         if (ether_type == vlan_proto) {
 153                 if (vlan_input(eh, m) < 0)
 154                         ifp->if_data.ifi_noproto++;
 155                 return EJUSTRETURN;
 156         }
 157 #endif /* NVLAN > 0 */
 158
 159     switch (ether_type) {
 160
 161     case ETHERTYPE_IP:
 162         if (ipflow_fastforward(m))
 163             return EJUSTRETURN;
 164         ptype = mtod(m, struct ip *)->ip_p;
 165         if ((sync_ok == 0) ||
 166             (ptype != IPPROTO_TCP && ptype != IPPROTO_UDP)) {
 167             schednetisr(NETISR_IP);
 168         }
 169
 170         inq = &ipintrq;
 171         break;
 172
 173     case ETHERTYPE_ARP:
 174         schednetisr(NETISR_ARP);
 175         inq = &arpintrq;
 176         break;
 177
 178     default: {
 179         return ENOENT;
 180         }
 181     }
 182
 183     if (inq == 0)
 184         return ENOENT;
 185
 186         s = splimp();
 187         if (IF_QFULL(inq)) {
 188                 IF_DROP(inq);
 189                 m_freem(m);
 190                 splx(s);
 191                 return EJUSTRETURN;
 192         } else
 193                 IF_ENQUEUE(inq, m);
 194         splx(s);
 195
 196     if ((sync_ok) &&
 197         (ptype == IPPROTO_TCP || ptype == IPPROTO_UDP)) {
 198         extern void ipintr(void);
 199
 200         s = splnet();
 201         ipintr();
 202         splx(s);
 203     }
 204
 205     return 0;
 206 }
 207
 208
 209
 210
 211 int
 212 inet_ether_pre_output(ifp, m0, dst_netaddr, route, type, edst, dl_tag )
 213     struct ifnet    *ifp;
 214     struct mbuf     **m0;
 215     struct sockaddr *dst_netaddr;
 216     caddr_t         route;
 217     char            *type;
 218     char            *edst;
 219     u_long          dl_tag;
 220 {
 221     struct rtentry  *rt0 = (struct rtentry *) route;
 222     int s;
 223     register struct mbuf *m = *m0;
 224     register struct rtentry *rt;
 225     register struct ether_header *eh;
 226     int off, len = m->m_pkthdr.len;
 227     int hlen;   /* link layer header lenght */
 228     struct arpcom *ac = IFP2AC(ifp);
 229
 230
 231
 232     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 233         return ENETDOWN;
 234
 235     rt = rt0;
 236     if (rt) {
 237         if ((rt->rt_flags & RTF_UP) == 0) {
 238             rt0 = rt = rtalloc1(dst_netaddr, 1, 0UL);
 239             if (rt0)
 240                 rt->rt_refcnt--;
 241             else
 242                 return EHOSTUNREACH;
 243         }
 244
 245         if (rt->rt_flags & RTF_GATEWAY) {
 246             if (rt->rt_gwroute == 0)
 247                 goto lookup;
 248             if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
 249                 rtfree(rt); rt = rt0;
 250             lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
 251                                               0UL);
 252                 if ((rt = rt->rt_gwroute) == 0)
 253                     return (EHOSTUNREACH);
 254             }
 255         }
 256
 257
 258         if (rt->rt_flags & RTF_REJECT)
 259             if (rt->rt_rmx.rmx_expire == 0 ||
 260                 time_second < rt->rt_rmx.rmx_expire)
 261                 return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
 262     }
 263
 264     hlen = ETHER_HDR_LEN;
 265
 266     /*
 267      * Tell ether_frameout it's ok to loop packet unless negated below.
 268      */
 269     m->m_flags |= M_LOOP;
 270
 271     switch (dst_netaddr->sa_family) {
 272
 273     case AF_INET:
 274         if (!arpresolve(ac, rt, m, dst_netaddr, edst, rt0))
 275             return (EJUSTRETURN);       /* if not yet resolved */
 276         off = m->m_pkthdr.len - m->m_len;
 277         *(u_short *)type = htons(ETHERTYPE_IP);
 278         break;
 279
 280     case AF_UNSPEC:
 281         m->m_flags &= ~M_LOOP;
 282         eh = (struct ether_header *)dst_netaddr->sa_data;
 283         (void)memcpy(edst, eh->ether_dhost, 6);
 284         *(u_short *)type = eh->ether_type;
 285         break;
 286
 287     default:
 288         kprintf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 289                dst_netaddr->sa_family);
 290
 291         return EAFNOSUPPORT;
 292     }
 293
 294     return (0);
 295 }
 296
 297
 298 int
 299 ether_inet_prmod_ioctl(dl_tag, ifp, command, data)
 300     u_long       dl_tag;
 301     struct ifnet *ifp;
 302     int          command;
 303     caddr_t      data;
 304 {
 305     struct ifaddr *ifa = (struct ifaddr *) data;
 306     struct ifreq *ifr = (struct ifreq *) data;
 307     struct rslvmulti_req *rsreq = (struct rslvmulti_req *) data;
 308     int error = 0;
 309     boolean_t funnel_state;
 310     struct arpcom *ac = (struct arpcom *) ifp;
 311     struct sockaddr_dl *sdl;
 312     struct sockaddr_in *sin;
 313     u_char *e_addr;
 314
 315
 316 #if 0
 317         /* No tneeded at soo_ioctlis already funnelled */
 318     funnel_state = thread_funnel_set(network_flock,TRUE);
 319 #endif
 320
 321     switch (command) {
 322     case SIOCRSLVMULTI: {
 323         switch(rsreq->sa->sa_family) {
 324
 325         case AF_INET:
 326                 sin = (struct sockaddr_in *)rsreq->sa;
 327                 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
 328                         return EADDRNOTAVAIL;
 329                 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
 330                        M_WAITOK);
 331                 sdl->sdl_len = sizeof *sdl;
 332                 sdl->sdl_family = AF_LINK;
 333                 sdl->sdl_index = ifp->if_index;
 334                 sdl->sdl_type = IFT_ETHER;
 335                 sdl->sdl_nlen = 0;
 336                 sdl->sdl_alen = ETHER_ADDR_LEN;
 337                 sdl->sdl_slen = 0;
 338                 e_addr = LLADDR(sdl);
 339                 ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
 340                 *rsreq->llsa = (struct sockaddr *)sdl;
 341                 return EJUSTRETURN;
 342
 343         default:
 344                 /*
 345                  * Well, the text isn't quite right, but it's the name
 346                  * that counts...
 347                  */
 348                 return EAFNOSUPPORT;
 349         }
 350
 351     }
 352     case SIOCSIFADDR:
 353          if ((ifp->if_flags & IFF_RUNNING) == 0) {
 354               ifp->if_flags |= IFF_UP;
 355               dlil_ioctl(0, ifp, SIOCSIFFLAGS, (caddr_t) 0);
 356          }
 357
 358          switch (ifa->ifa_addr->sa_family) {
 359
 360          case AF_INET:
 361
 362             if (ifp->if_init)
 363                 ifp->if_init(ifp->if_softc);    /* before arpwhohas */
 364
 365             //
 366             // See if another station has *our* IP address.
 367             // i.e.: There is an address conflict! If a
 368             // conflict exists, a message is sent to the
 369             // console.
 370             //
 371             if (IA_SIN(ifa)->sin_addr.s_addr != 0)
 372             {
 373                  /* don't bother for 0.0.0.0 */
 374                  ac->ac_ipaddr = IA_SIN(ifa)->sin_addr;
 375                  arpwhohas(ac, &IA_SIN(ifa)->sin_addr);
 376             }
 377
 378             arp_ifinit(IFP2AC(ifp), ifa);
 379
 380             break;
 381
 382         default:
 383             break;
 384         }
 385
 386         break;
 387
 388     case SIOCGIFADDR:
 389     {
 390         struct sockaddr *sa;
 391
 392         sa = (struct sockaddr *) & ifr->ifr_data;
 393         bcopy(IFP2AC(ifp)->ac_enaddr,
 394               (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
 395     }
 396     break;
 397
 398     case SIOCSIFMTU:
 399         /*
 400          * Set the interface MTU.
 401          */
 402         if (ifr->ifr_mtu > ETHERMTU) {
 403             error = EINVAL;
 404         } else {
 405             ifp->if_mtu = ifr->ifr_mtu;
 406         }
 407         break;
 408
 409     default:
 410          return EOPNOTSUPP;
 411     }
 412
 413     //(void) thread_funnel_set(network_flock, FALSE);
 414
 415     return (error);
 416 }
 417
 418
 419
 420
 421
 422 u_long
 423 ether_attach_inet(struct ifnet *ifp)
 424 {
 425     struct dlil_proto_reg_str   reg;
 426     struct dlil_demux_desc      desc;
 427     struct dlil_demux_desc      desc2;
 428     u_long                      ip_dl_tag=0;
 429     u_short en_native=ETHERTYPE_IP;
 430     u_short arp_native=ETHERTYPE_ARP;
 431     int   stat;
 432     int i;
 433
 434
 435     stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, PF_INET, &ip_dl_tag);
 436     if (stat == 0)
 437          return ip_dl_tag;
 438
 439     TAILQ_INIT(&reg.demux_desc_head);
 440     desc.type = DLIL_DESC_RAW;
 441     desc.variants.bitmask.proto_id_length = 0;
 442     desc.variants.bitmask.proto_id = 0;
 443     desc.variants.bitmask.proto_id_mask = 0;
 444     desc.native_type = (char *) &en_native;
 445     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
 446     reg.interface_family = ifp->if_family;
 447     reg.unit_number      = ifp->if_unit;
 448     reg.input            = inet_ether_input;
 449     reg.pre_output       = inet_ether_pre_output;
 450     reg.event            = 0;
 451     reg.offer            = 0;
 452     reg.ioctl            = ether_inet_prmod_ioctl;
 453     reg.default_proto    = 1;
 454     reg.protocol_family  = PF_INET;
 455
 456     desc2 = desc;
 457     desc2.native_type = (char *) &arp_native;
 458     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc2, next);
 459
 460     stat = dlil_attach_protocol(&reg, &ip_dl_tag);
 461     if (stat) {
 462         printf("WARNING: ether_attach_inet can't attach ip to interface\n");
 463         return stat;
 464     }
 465     /* XXX avoid free'ing the interface */
 466     ifp->if_eflags |= IFEF_DETACH_DISABLED;
 467     return ip_dl_tag;
 468 }
 469
 470 int  ether_detach_inet(struct ifnet *ifp)
 471 {
 472     u_long      ip_dl_tag = 0;
 473     int         stat;
 474
 475     stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, PF_INET, &ip_dl_tag);
 476     if (stat == 0) {
 477         stat = dlil_detach_protocol(ip_dl_tag);
 478         if (stat) {
 479             printf("WARNING: ether_detach_inet can't detach ip from interface\n");
 480         }
 481     }
 482     return stat;
 483 }
 484