sys/net/if_iso88025subr.c

   1 /*
   2  * Copyright (c) 1998, Larry Lile
   3  * All rights reserved.
   4  *
   5  * For latest sources and information on this driver, please
   6  * go to http://anarchy.stdio.com.
   7  *
   8  * Questions, comments or suggestions should be directed to
   9  * Larry Lile <lile@stdio.com>.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice unmodified, this list of conditions, and the following
  16  *    disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD: src/sys/net/if_iso88025subr.c,v 1.7.2.7 2002/06/18 00:15:31 kbyanc Exp $
  34  * $DragonFly: src/sys/net/if_iso88025subr.c,v 1.16 2006/12/23 00:44:54 swildner Exp $
  35  *
  36  */
  37
  38 /*
  39  *
  40  * General ISO 802.5 (Token Ring) support routines
  41  *
  42  */
  43
  44 #include "opt_inet.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/socket.h>
  52 #include <sys/sockio.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/serialize.h>
  55
  56 #include <net/if.h>
  57 #include <net/netisr.h>
  58 #include <net/route.h>
  59 #include <net/if_llc.h>
  60 #include <net/if_dl.h>
  61 #include <net/if_types.h>
  62
  63 #include <net/if_arp.h>
  64
  65 #include <net/iso88025.h>
  66
  67 #ifdef INET
  68 #include <netinet/in.h>
  69 #include <netinet/in_var.h>
  70 #include <netinet/if_ether.h>
  71 #endif
  72
  73 #include <net/bpf.h>
  74
  75 #include <machine/clock.h>
  76 #include <machine/md_var.h>
  77
  78 #include <bus/isa/i386/isa_device.h>
  79
  80 #include <vm/vm.h>
  81 #include <vm/vm_param.h>
  82 #include <vm/pmap.h>
  83
  84 #include <sys/kernel.h>
  85 #include <net/iso88025.h>
  86
  87 static int      iso88025_output(struct ifnet *, struct mbuf *,
  88                                 struct sockaddr *, struct rtentry *);
  89 static void     iso88025_input(struct ifnet *, struct mbuf *);
  90
  91 void
  92 iso88025_ifattach(struct ifnet *ifp, lwkt_serialize_t serializer)
  93 {
  94         struct sockaddr_dl *sdl;
  95
  96         ifp->if_input = iso88025_input;
  97         ifp->if_output = iso88025_output;
  98         if_attach(ifp, serializer);
  99         ifp->if_type = IFT_ISO88025;
 100         ifp->if_addrlen = ISO88025_ADDR_LEN;
 101         ifp->if_hdrlen = ISO88025_HDR_LEN;
 102         if (ifp->if_baudrate == 0)
 103                 ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
 104         if (ifp->if_mtu == 0)
 105                 ifp->if_mtu = ISO88025_DEFAULT_MTU;
 106
 107         sdl = IF_LLSOCKADDR(ifp);
 108         sdl->sdl_type = IFT_ISO88025;
 109         sdl->sdl_alen = ifp->if_addrlen;
 110         bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
 111         bpfattach(ifp, DLT_IEEE802, sizeof(struct iso88025_header));
 112 }
 113
 114 int
 115 iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
 116 {
 117         struct ifaddr *ifa = (struct ifaddr *) data;
 118         struct ifreq *ifr = (struct ifreq *) data;
 119         int error = 0;
 120
 121         switch (command) {
 122         case SIOCSIFADDR:
 123                 ifp->if_flags |= IFF_UP;
 124
 125                 switch (ifa->ifa_addr->sa_family) {
 126 #ifdef INET
 127                 case AF_INET:
 128                         lwkt_serialize_enter(ifp->if_serializer);
 129                         ifp->if_init(ifp->if_softc);    /* before arpwhohas */
 130                         lwkt_serialize_exit(ifp->if_serializer);
 131                         arp_ifinit(ifp, ifa);
 132                         break;
 133 #endif
 134                 default:
 135                         lwkt_serialize_enter(ifp->if_serializer);
 136                         ifp->if_init(ifp->if_softc);
 137                         lwkt_serialize_exit(ifp->if_serializer);
 138                         break;
 139                 }
 140                 break;
 141
 142         case SIOCGIFADDR:
 143                 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
 144                       ((struct sockaddr *)ifr->ifr_data)->sa_data,
 145                       ISO88025_ADDR_LEN);
 146                 break;
 147
 148         case SIOCSIFMTU:
 149                 /*
 150                  * Set the interface MTU.
 151                  */
 152                 if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
 153                         error = EINVAL;
 154                 } else {
 155                         ifp->if_mtu = ifr->ifr_mtu;
 156                 }
 157                 break;
 158         }
 159         return (error);
 160 }
 161
 162 /*
 163  * ISO88025 encapsulation
 164  */
 165 static int
 166 iso88025_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 167                 struct rtentry *rt0)
 168 {
 169         struct iso88025_header *th;
 170         struct iso88025_header gen_th;
 171         struct iso88025_sockaddr_data *sd = (struct iso88025_sockaddr_data *)dst->sa_data;
 172         struct llc *l;
 173         struct sockaddr_dl *sdl = NULL;
 174         int error = 0, rif_len = 0;
 175         u_char edst[6];
 176         struct rtentry *rt;
 177         int len = m->m_pkthdr.len, loop_copy = 0;
 178         struct arpcom *ac = (struct arpcom *)ifp;
 179
 180         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 181                 senderr(ENETDOWN);
 182
 183         if (rt0 == NULL)
 184                 senderr(EHOSTUNREACH);
 185         error = rt_llroute(dst, rt0, &rt);
 186         if (error != 0)
 187                 senderr(error);
 188
 189         /* Calculate routing info length based on arp table entry. */
 190         if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
 191                 if (SDL_ISO88025(sdl)->trld_rcf != NULL)
 192                         rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
 193
 194         /* Generate a generic 802.5 header for the packet. */
 195         gen_th.ac = TR_AC;
 196         gen_th.fc = TR_LLC_FRAME;
 197         memcpy(gen_th.iso88025_shost, ac->ac_enaddr, sizeof ac->ac_enaddr);
 198         if (rif_len) {
 199                 gen_th.iso88025_shost[0] |= TR_RII;
 200                 if (rif_len > 2) {
 201                         gen_th.rcf = sdl->sdl_rcf;
 202                         memcpy(gen_th.rd, sdl->sdl_route, rif_len - 2);
 203                 }
 204         }
 205
 206
 207         switch (dst->sa_family) {
 208 #ifdef INET
 209         case AF_INET:
 210                 if (!arpresolve(ifp, rt0, m, dst, edst))
 211                         return (0);     /* if not yet resolved */
 212                 /* Add LLC and SNAP headers */
 213                 M_PREPEND(m, 8, MB_DONTWAIT);
 214                 if (m == NULL)
 215                         return (ENOBUFS);
 216                 l = mtod(m, struct llc *);
 217                 l->llc_un.type_snap.ether_type = htons(ETHERTYPE_IP);
 218                 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
 219                 l->llc_un.type_snap.control = LLC_UI;
 220                 l->llc_un.type_snap.org_code[0] = 0x0;
 221                 l->llc_un.type_snap.org_code[1] = 0x0;
 222                 l->llc_un.type_snap.org_code[2] = 0x0;
 223                 memcpy(gen_th.iso88025_dhost, edst, sizeof(edst));
 224                 break;
 225 #endif
 226
 227         case AF_UNSPEC:
 228                 /*
 229                  * For AF_UNSPEC sockaddr.sa_data must contain all of the
 230                  * mac information needed to send the packet.  This allows
 231                  * full mac, llc, and source routing function to be controlled.
 232                  * llc and source routing information must already be in the
 233                  * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
 234                  * should be a iso88025_sockaddr_data structure see iso88025.h
 235                  */
 236                 loop_copy = -1;
 237                 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
 238                 gen_th.ac = sd->ac;
 239                 gen_th.fc = sd->fc;
 240                 memcpy(gen_th.iso88025_dhost, sd->ether_dhost, sizeof(sd->ether_dhost));
 241                 memcpy(gen_th.iso88025_shost, sd->ether_shost, sizeof(sd->ether_shost));
 242                 rif_len = 0;
 243                 break;
 244
 245         default:
 246                 kprintf("%s: can't handle af%d\n", ifp->if_xname,
 247                         dst->sa_family);
 248                 senderr(EAFNOSUPPORT);
 249         }
 250
 251         /*
 252          * Add local net header.  If no space in first mbuf,
 253          * allocate another.
 254          */
 255
 256         M_PREPEND(m, ISO88025_HDR_LEN + rif_len, MB_DONTWAIT);
 257         if (m == NULL)
 258                 return (ENOBUFS);
 259
 260         /* Copy as much of the generic header as is needed into the mbuf */
 261         th = mtod(m, struct iso88025_header *);
 262         memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
 263
 264         /*
 265          * If a simplex interface, and the packet is being sent to our
 266          * Ethernet address or a broadcast address, loopback a copy.
 267          * XXX To make a simplex device behave exactly like a duplex
 268          * device, we should copy in the case of sending to our own
 269          * ethernet address (thus letting the original actually appear
 270          * on the wire). However, we don't do that here for security
 271          * reasons and compatibility with the original behavior.
 272          */
 273         if ((ifp->if_flags & IFF_SIMPLEX) &&
 274            (loop_copy != -1)) {
 275                 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
 276                         struct mbuf *n = m_copypacket(m, MB_DONTWAIT);
 277
 278                         if_simloop(ifp, n, dst->sa_family, ISO88025_HDR_LEN);
 279                 } else if (bcmp(th->iso88025_dhost,
 280                     th->iso88025_shost, ETHER_ADDR_LEN) == 0) {
 281                         if_simloop(ifp, m, dst->sa_family, ISO88025_HDR_LEN);
 282                         return (0);     /* XXX */
 283                 }
 284         }
 285
 286         crit_enter();
 287         /*
 288          * Queue message on interface, and start output if interface
 289          * not yet active.
 290          */
 291         if (IF_QFULL(&ifp->if_snd)) {
 292                 kprintf("iso88025_output: packet dropped QFULL.\n");
 293                 IF_DROP(&ifp->if_snd);
 294                 crit_exit();
 295                 senderr(ENOBUFS);
 296         }
 297         if (m->m_flags & M_MCAST)
 298                 ifp->if_omcasts++;
 299         IF_ENQUEUE(&ifp->if_snd, m);
 300         if (!(ifp->if_flags & IFF_OACTIVE))
 301                 (*ifp->if_start)(ifp);
 302         crit_exit();
 303         ifp->if_obytes += len + ISO88025_HDR_LEN + 8;
 304         return (error);
 305
 306 bad:
 307         m_freem(m);
 308         return (error);
 309 }
 310
 311 /*
 312  * ISO 88025 de-encapsulation
 313  */
 314 static void
 315 iso88025_input(struct ifnet *ifp, struct mbuf *m)
 316 {
 317         struct llc *l;
 318         struct iso88025_header *th = mtod(m, struct iso88025_header *);
 319         int isr, hdr_len;
 320         u_short ether_type;
 321
 322         ASSERT_SERIALIZED(ifp->if_serializer);
 323
 324         if (!(ifp->if_flags & IFF_UP)) {
 325                 m_freem(m);
 326                 return;
 327         }
 328
 329         hdr_len = ISO88025_HDR_LEN;
 330         if (th->iso88025_shost[0] & 0x80)
 331                 hdr_len += (ntohs(th->rcf) & 0x1f00) >> 8;
 332
 333         if (m->m_len < hdr_len) {
 334                 m_freem(m);
 335                 return;
 336         }
 337         m->m_pkthdr.len -= hdr_len;
 338         m->m_len -= hdr_len;
 339         m->m_data += hdr_len;
 340
 341         l = mtod(m, struct llc *);
 342
 343         switch (l->llc_control) {
 344         case LLC_UI:
 345                 break;
 346         case LLC_TEST:
 347         case LLC_TEST_P:
 348         {
 349                 struct sockaddr sa;
 350                 struct arpcom *ac = (struct arpcom *)ifp;
 351                 struct iso88025_sockaddr_data *th2;
 352                 int i;
 353                 u_char c = l->llc_dsap;
 354
 355                 if (th->iso88025_shost[0] & TR_RII) { /* XXX */
 356                         kprintf("iso88025_input: dropping source routed LLC_TEST\n");
 357                         m_free(m);
 358                         return;
 359                 }
 360                 l->llc_dsap = l->llc_ssap;
 361                 l->llc_ssap = c;
 362                 if (m->m_flags & (M_BCAST | M_MCAST))
 363                         bcopy(ac->ac_enaddr, th->iso88025_dhost,
 364                               ISO88025_ADDR_LEN);
 365                 sa.sa_family = AF_UNSPEC;
 366                 sa.sa_len = sizeof(sa);
 367                 th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
 368                 for (i = 0; i < ISO88025_ADDR_LEN; i++) {
 369                         th2->ether_shost[i] = c = th->iso88025_dhost[i];
 370                         th2->ether_dhost[i] = th->iso88025_dhost[i] = th->iso88025_shost[i];
 371                         th->iso88025_shost[i] = c;
 372                 }
 373                 th2->ac = TR_AC;
 374                 th2->fc = TR_LLC_FRAME;
 375                 ifp->if_output(ifp, m, &sa, NULL);
 376                 return;
 377         }
 378         default:
 379                 kprintf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
 380                 m_freem(m);
 381                 return;
 382         }
 383
 384         m->m_pkthdr.len -= 8;
 385         m->m_len -= 8;
 386         m->m_data += 8; /* Length of LLC header in our case */
 387
 388         ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
 389         if (th->iso88025_dhost[0] & 1) {
 390                 if (bcmp(ifp->if_broadcastaddr, th->iso88025_dhost,
 391                          ifp->if_addrlen) == 0)
 392                         m->m_flags |= M_BCAST;
 393                 else
 394                         m->m_flags |= M_MCAST;
 395         }
 396         if (m->m_flags & (M_BCAST|M_MCAST))
 397                 ifp->if_imcasts++;
 398
 399         ether_type = ntohs(l->llc_un.type_snap.ether_type);
 400
 401         switch (ether_type) {
 402 #ifdef INET
 403         case ETHERTYPE_IP:
 404                 th->iso88025_shost[0] &= ~(TR_RII);
 405                 if (ipflow_fastforward(m, ifp->if_serializer))
 406                         return;
 407                 isr = NETISR_IP;
 408                 break;
 409
 410         case ETHERTYPE_ARP:
 411                 if (ifp->if_flags & IFF_NOARP) {
 412                         m_freem(m);
 413                         return;
 414                 }
 415                 isr = NETISR_ARP;
 416                 break;
 417 #endif
 418         default:
 419             m_freem(m);
 420             return;
 421         }
 422
 423         netisr_dispatch(isr, m);
 424 }