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