Annotation of sys/net/if_ethersubr.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: if_ethersubr.c,v 1.110 2007/06/06 10:04:36 henning Exp $ */
! 2: /* $NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $ */
! 3:
! 4: /*
! 5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the project nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: /*
! 34: * Copyright (c) 1982, 1989, 1993
! 35: * The Regents of the University of California. All rights reserved.
! 36: *
! 37: * Redistribution and use in source and binary forms, with or without
! 38: * modification, are permitted provided that the following conditions
! 39: * are met:
! 40: * 1. Redistributions of source code must retain the above copyright
! 41: * notice, this list of conditions and the following disclaimer.
! 42: * 2. Redistributions in binary form must reproduce the above copyright
! 43: * notice, this list of conditions and the following disclaimer in the
! 44: * documentation and/or other materials provided with the distribution.
! 45: * 3. Neither the name of the University nor the names of its contributors
! 46: * may be used to endorse or promote products derived from this software
! 47: * without specific prior written permission.
! 48: *
! 49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 59: * SUCH DAMAGE.
! 60: *
! 61: * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
! 62: */
! 63:
! 64: /*
! 65: %%% portions-copyright-nrl-95
! 66: Portions of this software are Copyright 1995-1998 by Randall Atkinson,
! 67: Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights
! 68: Reserved. All rights under this copyright have been assigned to the US
! 69: Naval Research Laboratory (NRL). The NRL Copyright Notice and License
! 70: Agreement Version 1.1 (January 17, 1995) applies to these portions of the
! 71: software.
! 72: You should have received a copy of the license with this software. If you
! 73: didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.
! 74: */
! 75:
! 76: #include "bpfilter.h"
! 77:
! 78: #include <sys/param.h>
! 79: #include <sys/systm.h>
! 80: #include <sys/kernel.h>
! 81: #include <sys/malloc.h>
! 82: #include <sys/mbuf.h>
! 83: #include <sys/protosw.h>
! 84: #include <sys/socket.h>
! 85: #include <sys/ioctl.h>
! 86: #include <sys/errno.h>
! 87: #include <sys/syslog.h>
! 88: #include <sys/timeout.h>
! 89:
! 90: #include <machine/cpu.h>
! 91:
! 92: #include <net/if.h>
! 93: #include <net/netisr.h>
! 94: #include <net/route.h>
! 95: #include <net/if_llc.h>
! 96: #include <net/if_dl.h>
! 97: #include <net/if_media.h>
! 98: #include <net/if_types.h>
! 99:
! 100: #include <netinet/in.h>
! 101: #ifdef INET
! 102: #include <netinet/in_var.h>
! 103: #endif
! 104: #include <netinet/if_ether.h>
! 105: #include <netinet/ip_ipsp.h>
! 106:
! 107: #if NBPFILTER > 0
! 108: #include <net/bpf.h>
! 109: #endif
! 110:
! 111: #include "bridge.h"
! 112: #if NBRIDGE > 0
! 113: #include <net/if_bridge.h>
! 114: #endif
! 115:
! 116: #include "vlan.h"
! 117: #if NVLAN > 0
! 118: #include <net/if_vlan_var.h>
! 119: #endif /* NVLAN > 0 */
! 120:
! 121: #include "carp.h"
! 122: #if NCARP > 0
! 123: #include <netinet/ip_carp.h>
! 124: #endif
! 125:
! 126: #include "pppoe.h"
! 127: #if NPPPOE > 0
! 128: #include <net/if_pppoe.h>
! 129: #endif
! 130:
! 131: #include "trunk.h"
! 132: #if NTRUNK > 0
! 133: #include <net/if_trunk.h>
! 134: #endif
! 135:
! 136: #ifdef INET6
! 137: #ifndef INET
! 138: #include <netinet/in.h>
! 139: #endif
! 140: #include <netinet6/in6_var.h>
! 141: #include <netinet6/nd6.h>
! 142: #endif
! 143:
! 144: #ifdef NETATALK
! 145: #include <netatalk/at.h>
! 146: #include <netatalk/at_var.h>
! 147: #include <netatalk/at_extern.h>
! 148:
! 149: extern u_char at_org_code[ 3 ];
! 150: extern u_char aarp_org_code[ 3 ];
! 151: #endif /* NETATALK */
! 152:
! 153: u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
! 154: { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
! 155: #define senderr(e) { error = (e); goto bad;}
! 156:
! 157:
! 158: int
! 159: ether_ioctl(ifp, arp, cmd, data)
! 160: struct ifnet *ifp;
! 161: struct arpcom *arp;
! 162: u_long cmd;
! 163: caddr_t data;
! 164: {
! 165: struct ifaddr *ifa = (struct ifaddr *)data;
! 166: int error = 0;
! 167:
! 168: switch (cmd) {
! 169:
! 170: case SIOCSIFADDR:
! 171: switch (ifa->ifa_addr->sa_family) {
! 172: #ifdef NETATALK
! 173: case AF_APPLETALK:
! 174: /* Nothing to do. */
! 175: break;
! 176: #endif /* NETATALK */
! 177: }
! 178: break;
! 179: default:
! 180: break;
! 181: }
! 182:
! 183: return error;
! 184: }
! 185:
! 186: /*
! 187: * Ethernet output routine.
! 188: * Encapsulate a packet of type family for the local net.
! 189: * Assumes that ifp is actually pointer to arpcom structure.
! 190: */
! 191: int
! 192: ether_output(ifp0, m0, dst, rt0)
! 193: struct ifnet *ifp0;
! 194: struct mbuf *m0;
! 195: struct sockaddr *dst;
! 196: struct rtentry *rt0;
! 197: {
! 198: u_int16_t etype;
! 199: int s, len, error = 0, hdrcmplt = 0;
! 200: u_char edst[ETHER_ADDR_LEN], esrc[ETHER_ADDR_LEN];
! 201: struct mbuf *m = m0;
! 202: struct rtentry *rt;
! 203: struct mbuf *mcopy = (struct mbuf *)0;
! 204: struct ether_header *eh;
! 205: struct arpcom *ac = (struct arpcom *)ifp0;
! 206: short mflags;
! 207: struct ifnet *ifp = ifp0;
! 208:
! 209: #if NTRUNK > 0
! 210: if (ifp->if_type == IFT_IEEE8023ADLAG)
! 211: senderr(EBUSY);
! 212: #endif
! 213:
! 214: #if NCARP > 0
! 215: if (ifp->if_type == IFT_CARP) {
! 216: struct ifaddr *ifa;
! 217:
! 218: /* loop back if this is going to the carp interface */
! 219: if (dst != NULL && LINK_STATE_IS_UP(ifp0->if_link_state) &&
! 220: (ifa = ifa_ifwithaddr(dst)) != NULL &&
! 221: ifa->ifa_ifp == ifp0)
! 222: return (looutput(ifp0, m, dst, rt0));
! 223:
! 224: ifp = ifp->if_carpdev;
! 225: ac = (struct arpcom *)ifp;
! 226:
! 227: if ((ifp0->if_flags & (IFF_UP|IFF_RUNNING)) !=
! 228: (IFF_UP|IFF_RUNNING))
! 229: senderr(ENETDOWN);
! 230: }
! 231: #endif /* NCARP > 0 */
! 232:
! 233: if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
! 234: senderr(ENETDOWN);
! 235: if ((rt = rt0) != NULL) {
! 236: if ((rt->rt_flags & RTF_UP) == 0) {
! 237: if ((rt0 = rt = rtalloc1(dst, 1, 0)) != NULL)
! 238: rt->rt_refcnt--;
! 239: else
! 240: senderr(EHOSTUNREACH);
! 241: }
! 242: if (rt->rt_flags & RTF_GATEWAY) {
! 243: if (rt->rt_gwroute == 0)
! 244: goto lookup;
! 245: if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
! 246: rtfree(rt); rt = rt0;
! 247: lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0);
! 248: if ((rt = rt->rt_gwroute) == 0)
! 249: senderr(EHOSTUNREACH);
! 250: }
! 251: }
! 252: if (rt->rt_flags & RTF_REJECT)
! 253: if (rt->rt_rmx.rmx_expire == 0 ||
! 254: time_second < rt->rt_rmx.rmx_expire)
! 255: senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
! 256: }
! 257:
! 258: switch (dst->sa_family) {
! 259:
! 260: #ifdef INET
! 261: case AF_INET:
! 262: if (!arpresolve(ac, rt, m, dst, edst))
! 263: return (0); /* if not yet resolved */
! 264: /* If broadcasting on a simplex interface, loopback a copy */
! 265: if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
! 266: !m->m_pkthdr.pf.routed)
! 267: mcopy = m_copy(m, 0, (int)M_COPYALL);
! 268: etype = htons(ETHERTYPE_IP);
! 269: break;
! 270: #endif
! 271: #ifdef INET6
! 272: case AF_INET6:
! 273: if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst))
! 274: return (0); /* it must be impossible, but... */
! 275: etype = htons(ETHERTYPE_IPV6);
! 276: break;
! 277: #endif
! 278: #ifdef NETATALK
! 279: case AF_APPLETALK: {
! 280: struct at_ifaddr *aa;
! 281:
! 282: if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) {
! 283: #ifdef NETATALKDEBUG
! 284: extern char *prsockaddr(struct sockaddr *);
! 285: printf("aarpresolv: failed for %s\n", prsockaddr(dst));
! 286: #endif /* NETATALKDEBUG */
! 287: return (0);
! 288: }
! 289:
! 290: /*
! 291: * ifaddr is the first thing in at_ifaddr
! 292: */
! 293: aa = (struct at_ifaddr *)at_ifawithnet(
! 294: (struct sockaddr_at *)dst,
! 295: TAILQ_FIRST(&ifp->if_addrlist));
! 296: if (aa == 0)
! 297: goto bad;
! 298:
! 299: /*
! 300: * In the phase 2 case, we need to prepend an mbuf for the llc
! 301: * header. Since we must preserve the value of m, which is
! 302: * passed to us by value, we m_copy() the first mbuf,
! 303: * and use it for our llc header.
! 304: */
! 305: if (aa->aa_flags & AFA_PHASE2) {
! 306: struct llc llc;
! 307:
! 308: M_PREPEND(m, AT_LLC_SIZE, M_DONTWAIT);
! 309: if (m == NULL)
! 310: return (0);
! 311: /*
! 312: * FreeBSD doesn't count the LLC len in
! 313: * ifp->obytes, so they increment a length
! 314: * field here. We don't do this.
! 315: */
! 316: llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
! 317: llc.llc_control = LLC_UI;
! 318: bcopy(at_org_code, llc.llc_snap.org_code,
! 319: sizeof(at_org_code));
! 320: llc.llc_snap.ether_type = htons( ETHERTYPE_AT );
! 321: bcopy(&llc, mtod(m, caddr_t), AT_LLC_SIZE);
! 322: etype = htons(m->m_pkthdr.len);
! 323: } else {
! 324: etype = htons(ETHERTYPE_AT);
! 325: }
! 326: } break;
! 327: #endif /* NETATALK */
! 328: case pseudo_AF_HDRCMPLT:
! 329: hdrcmplt = 1;
! 330: eh = (struct ether_header *)dst->sa_data;
! 331: bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof(esrc));
! 332: /* FALLTHROUGH */
! 333:
! 334: case AF_UNSPEC:
! 335: eh = (struct ether_header *)dst->sa_data;
! 336: bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof(edst));
! 337: /* AF_UNSPEC doesn't swap the byte order of the ether_type. */
! 338: etype = eh->ether_type;
! 339: break;
! 340:
! 341: default:
! 342: printf("%s: can't handle af%d\n", ifp->if_xname,
! 343: dst->sa_family);
! 344: senderr(EAFNOSUPPORT);
! 345: }
! 346:
! 347: /* XXX Should we feed-back an unencrypted IPsec packet ? */
! 348: if (mcopy)
! 349: (void) looutput(ifp, mcopy, dst, rt);
! 350:
! 351: /*
! 352: * Add local net header. If no space in first mbuf,
! 353: * allocate another.
! 354: */
! 355: M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
! 356: if (m == 0)
! 357: senderr(ENOBUFS);
! 358: eh = mtod(m, struct ether_header *);
! 359: bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type,
! 360: sizeof(eh->ether_type));
! 361: bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof(edst));
! 362: if (hdrcmplt)
! 363: bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost,
! 364: sizeof(eh->ether_shost));
! 365: else
! 366: bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,
! 367: sizeof(eh->ether_shost));
! 368:
! 369: #if NCARP > 0
! 370: if (ifp0 != ifp && ifp0->if_type == IFT_CARP &&
! 371: !(ifp0->if_flags & IFF_LINK1)) {
! 372: bcopy((caddr_t)((struct arpcom *)ifp0)->ac_enaddr,
! 373: (caddr_t)eh->ether_shost, sizeof(eh->ether_shost));
! 374: }
! 375: #endif
! 376:
! 377: #if NBRIDGE > 0
! 378: /*
! 379: * Interfaces that are bridge members need special handling
! 380: * for output.
! 381: */
! 382: if (ifp->if_bridge) {
! 383: struct m_tag *mtag;
! 384:
! 385: /*
! 386: * Check if this packet has already been sent out through
! 387: * this bridge, in which case we simply send it out
! 388: * without further bridge processing.
! 389: */
! 390: for (mtag = m_tag_find(m, PACKET_TAG_BRIDGE, NULL); mtag;
! 391: mtag = m_tag_find(m, PACKET_TAG_BRIDGE, mtag)) {
! 392: #ifdef DEBUG
! 393: /* Check that the information is there */
! 394: if (mtag->m_tag_len != sizeof(caddr_t)) {
! 395: error = EINVAL;
! 396: goto bad;
! 397: }
! 398: #endif
! 399: if (!bcmp(&ifp->if_bridge, mtag + 1, sizeof(caddr_t)))
! 400: break;
! 401: }
! 402: if (mtag == NULL) {
! 403: /* Attach a tag so we can detect loops */
! 404: mtag = m_tag_get(PACKET_TAG_BRIDGE, sizeof(caddr_t),
! 405: M_NOWAIT);
! 406: if (mtag == NULL) {
! 407: error = ENOBUFS;
! 408: goto bad;
! 409: }
! 410: bcopy(&ifp->if_bridge, mtag + 1, sizeof(caddr_t));
! 411: m_tag_prepend(m, mtag);
! 412: error = bridge_output(ifp, m, NULL, NULL);
! 413: return (error);
! 414: }
! 415: }
! 416: #endif
! 417:
! 418: mflags = m->m_flags;
! 419: len = m->m_pkthdr.len;
! 420: s = splnet();
! 421: /*
! 422: * Queue message on interface, and start output if interface
! 423: * not yet active.
! 424: */
! 425: IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
! 426: if (error) {
! 427: /* mbuf is already freed */
! 428: splx(s);
! 429: return (error);
! 430: }
! 431: ifp->if_obytes += len + ETHER_HDR_LEN;
! 432: #if NCARP > 0
! 433: if (ifp != ifp0)
! 434: ifp0->if_obytes += len + ETHER_HDR_LEN;
! 435: #endif /* NCARP > 0 */
! 436: if (mflags & M_MCAST)
! 437: ifp->if_omcasts++;
! 438: if ((ifp->if_flags & IFF_OACTIVE) == 0)
! 439: (*ifp->if_start)(ifp);
! 440: splx(s);
! 441: return (error);
! 442:
! 443: bad:
! 444: if (m)
! 445: m_freem(m);
! 446: return (error);
! 447: }
! 448:
! 449: /*
! 450: * Process a received Ethernet packet;
! 451: * the packet is in the mbuf chain m without
! 452: * the ether header, which is provided separately.
! 453: */
! 454: void
! 455: ether_input(ifp, eh, m)
! 456: struct ifnet *ifp;
! 457: struct ether_header *eh;
! 458: struct mbuf *m;
! 459: {
! 460: struct ifqueue *inq;
! 461: u_int16_t etype;
! 462: int s, llcfound = 0;
! 463: struct llc *l;
! 464: struct arpcom *ac;
! 465: #if NTRUNK > 0
! 466: int i = 0;
! 467: #endif
! 468: #if NPPPOE > 0
! 469: struct ether_header *eh_tmp;
! 470: #endif
! 471:
! 472: if (eh == NULL) {
! 473: eh = mtod(m, struct ether_header *);
! 474: m_adj(m, ETHER_HDR_LEN);
! 475: }
! 476:
! 477: #if NTRUNK > 0
! 478: /* Handle input from a trunk port */
! 479: while (ifp->if_type == IFT_IEEE8023ADLAG) {
! 480: if (++i > TRUNK_MAX_STACKING ||
! 481: trunk_input(ifp, eh, m) != 0) {
! 482: if (m)
! 483: m_freem(m);
! 484: return;
! 485: }
! 486:
! 487: /* Has been set to the trunk interface */
! 488: ifp = m->m_pkthdr.rcvif;
! 489: }
! 490: #endif
! 491:
! 492: if ((ifp->if_flags & IFF_UP) == 0) {
! 493: m_freem(m);
! 494: return;
! 495: }
! 496: if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
! 497: if ((ifp->if_flags & IFF_SIMPLEX) == 0) {
! 498: struct ifaddr *ifa;
! 499: struct sockaddr_dl *sdl = NULL;
! 500:
! 501: TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
! 502: if ((sdl =
! 503: (struct sockaddr_dl *)ifa->ifa_addr) &&
! 504: sdl->sdl_family == AF_LINK)
! 505: break;
! 506: }
! 507: /*
! 508: * If this is not a simplex interface, drop the packet
! 509: * if it came from us.
! 510: */
! 511: if (sdl && bcmp(LLADDR(sdl), eh->ether_shost,
! 512: ETHER_ADDR_LEN) == 0) {
! 513: m_freem(m);
! 514: return;
! 515: }
! 516: }
! 517:
! 518: if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
! 519: sizeof(etherbroadcastaddr)) == 0)
! 520: m->m_flags |= M_BCAST;
! 521: else
! 522: m->m_flags |= M_MCAST;
! 523: ifp->if_imcasts++;
! 524: }
! 525:
! 526: ifp->if_ibytes += m->m_pkthdr.len + sizeof(*eh);
! 527:
! 528: etype = ntohs(eh->ether_type);
! 529:
! 530: #if NVLAN > 0
! 531: if (etype == ETHERTYPE_VLAN && (vlan_input(eh, m) == 0))
! 532: return;
! 533: #endif
! 534:
! 535: #if NBRIDGE > 0
! 536: /*
! 537: * Tap the packet off here for a bridge, if configured and
! 538: * active for this interface. bridge_input returns
! 539: * NULL if it has consumed the packet, otherwise, it
! 540: * gets processed as normal.
! 541: */
! 542: if (ifp->if_bridge) {
! 543: if (m->m_flags & M_PROTO1)
! 544: m->m_flags &= ~M_PROTO1;
! 545: else {
! 546: m = bridge_input(ifp, eh, m);
! 547: if (m == NULL)
! 548: return;
! 549: /* The bridge has determined it's for us. */
! 550: ifp = m->m_pkthdr.rcvif;
! 551: }
! 552: }
! 553: #endif
! 554:
! 555: #if NVLAN > 0
! 556: if (etype == ETHERTYPE_VLAN) {
! 557: /* The bridge did not want the vlan frame either, drop it. */
! 558: ifp->if_noproto++;
! 559: m_freem(m);
! 560: return;
! 561: }
! 562: #endif /* NVLAN > 0 */
! 563:
! 564: #if NCARP > 0
! 565: if (ifp->if_carp) {
! 566: if (ifp->if_type != IFT_CARP &&
! 567: (carp_input(m, (u_int8_t *)&eh->ether_shost,
! 568: (u_int8_t *)&eh->ether_dhost, eh->ether_type) == 0))
! 569: return;
! 570: /* Always clear multicast flags if received on a carp address */
! 571: else if (ifp->if_type == IFT_CARP &&
! 572: ifp->if_flags & IFF_LINK2 &&
! 573: m->m_flags & (M_BCAST|M_MCAST) &&
! 574: !bcmp(((struct arpcom *)ifp)->ac_enaddr,
! 575: (caddr_t)eh->ether_dhost, ETHER_ADDR_LEN))
! 576: m->m_flags &= ~(M_BCAST|M_MCAST);
! 577: }
! 578: #endif /* NCARP > 0 */
! 579:
! 580: ac = (struct arpcom *)ifp;
! 581:
! 582: /*
! 583: * If packet has been filtered by the bpf listener, drop it now
! 584: */
! 585: if (m->m_flags & M_FILDROP) {
! 586: m_free(m);
! 587: return;
! 588: }
! 589:
! 590: /*
! 591: * If packet is unicast and we're in promiscuous mode, make sure it
! 592: * is for us. Drop otherwise.
! 593: */
! 594: if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&
! 595: (ifp->if_flags & IFF_PROMISC)) {
! 596: if (bcmp(ac->ac_enaddr, (caddr_t)eh->ether_dhost,
! 597: ETHER_ADDR_LEN)) {
! 598: m_freem(m);
! 599: return;
! 600: }
! 601: }
! 602:
! 603: decapsulate:
! 604:
! 605: switch (etype) {
! 606: #ifdef INET
! 607: case ETHERTYPE_IP:
! 608: schednetisr(NETISR_IP);
! 609: inq = &ipintrq;
! 610: break;
! 611:
! 612: case ETHERTYPE_ARP:
! 613: if (ifp->if_flags & IFF_NOARP)
! 614: goto dropanyway;
! 615: schednetisr(NETISR_ARP);
! 616: inq = &arpintrq;
! 617: break;
! 618:
! 619: case ETHERTYPE_REVARP:
! 620: if (ifp->if_flags & IFF_NOARP)
! 621: goto dropanyway;
! 622: revarpinput(m); /* XXX queue? */
! 623: return;
! 624:
! 625: #endif
! 626: #ifdef INET6
! 627: /*
! 628: * Schedule IPv6 software interrupt for incoming IPv6 packet.
! 629: */
! 630: case ETHERTYPE_IPV6:
! 631: schednetisr(NETISR_IPV6);
! 632: inq = &ip6intrq;
! 633: break;
! 634: #endif /* INET6 */
! 635: #ifdef NETATALK
! 636: case ETHERTYPE_AT:
! 637: schednetisr(NETISR_ATALK);
! 638: inq = &atintrq1;
! 639: break;
! 640: case ETHERTYPE_AARP:
! 641: /* probably this should be done with a NETISR as well */
! 642: /* XXX queue this */
! 643: aarpinput((struct arpcom *)ifp, m);
! 644: return;
! 645: #endif
! 646: #if NPPPOE > 0
! 647: case ETHERTYPE_PPPOEDISC:
! 648: case ETHERTYPE_PPPOE:
! 649: /* XXX we dont have this flag */
! 650: /*
! 651: if (m->m_flags & M_PROMISC) {
! 652: m_freem(m);
! 653: return;
! 654: }
! 655: */
! 656: #ifndef PPPOE_SERVER
! 657: if (m->m_flags & (M_MCAST | M_BCAST)) {
! 658: m_freem(m);
! 659: return;
! 660: }
! 661: #endif
! 662: M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
! 663: if (m == NULL)
! 664: return;
! 665:
! 666: eh_tmp = mtod(m, struct ether_header *);
! 667: bcopy(eh, eh_tmp, sizeof(struct ether_header));
! 668:
! 669: if (etype == ETHERTYPE_PPPOEDISC)
! 670: inq = &ppoediscinq;
! 671: else
! 672: inq = &ppoeinq;
! 673:
! 674: schednetisr(NETISR_PPPOE);
! 675: break;
! 676: #endif /* NPPPOE > 0 */
! 677: default:
! 678: if (llcfound || etype > ETHERMTU)
! 679: goto dropanyway;
! 680: llcfound = 1;
! 681: l = mtod(m, struct llc *);
! 682: switch (l->llc_dsap) {
! 683: case LLC_SNAP_LSAP:
! 684: #ifdef NETATALK
! 685: /*
! 686: * Some protocols (like Appletalk) need special
! 687: * handling depending on if they are type II
! 688: * or SNAP encapsulated. Everything else
! 689: * gets handled by stripping off the SNAP header
! 690: * and going back up to decapsulate.
! 691: */
! 692: if (l->llc_control == LLC_UI &&
! 693: l->llc_ssap == LLC_SNAP_LSAP &&
! 694: Bcmp(&(l->llc_snap.org_code)[0],
! 695: at_org_code, sizeof(at_org_code)) == 0 &&
! 696: ntohs(l->llc_snap.ether_type) == ETHERTYPE_AT) {
! 697: inq = &atintrq2;
! 698: m_adj(m, AT_LLC_SIZE);
! 699: schednetisr(NETISR_ATALK);
! 700: break;
! 701: }
! 702:
! 703: if (l->llc_control == LLC_UI &&
! 704: l->llc_ssap == LLC_SNAP_LSAP &&
! 705: Bcmp(&(l->llc_snap.org_code)[0],
! 706: aarp_org_code, sizeof(aarp_org_code)) == 0 &&
! 707: ntohs(l->llc_snap.ether_type) == ETHERTYPE_AARP) {
! 708: m_adj(m, AT_LLC_SIZE);
! 709: /* XXX Really this should use netisr too */
! 710: aarpinput((struct arpcom *)ifp, m);
! 711: return;
! 712: }
! 713: #endif /* NETATALK */
! 714: if (l->llc_control == LLC_UI &&
! 715: l->llc_dsap == LLC_SNAP_LSAP &&
! 716: l->llc_ssap == LLC_SNAP_LSAP) {
! 717: /* SNAP */
! 718: if (m->m_pkthdr.len > etype)
! 719: m_adj(m, etype - m->m_pkthdr.len);
! 720: m->m_data += 6; /* XXX */
! 721: m->m_len -= 6; /* XXX */
! 722: m->m_pkthdr.len -= 6; /* XXX */
! 723: M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
! 724: if (m == 0)
! 725: return;
! 726: *mtod(m, struct ether_header *) = *eh;
! 727: goto decapsulate;
! 728: }
! 729: goto dropanyway;
! 730: dropanyway:
! 731: default:
! 732: m_freem(m);
! 733: return;
! 734: }
! 735: }
! 736:
! 737: s = splnet();
! 738: IF_INPUT_ENQUEUE(inq, m);
! 739: splx(s);
! 740: }
! 741:
! 742: /*
! 743: * Convert Ethernet address to printable (loggable) representation.
! 744: */
! 745: static char digits[] = "0123456789abcdef";
! 746: char *
! 747: ether_sprintf(ap)
! 748: u_char *ap;
! 749: {
! 750: int i;
! 751: static char etherbuf[ETHER_ADDR_LEN * 3];
! 752: char *cp = etherbuf;
! 753:
! 754: for (i = 0; i < ETHER_ADDR_LEN; i++) {
! 755: *cp++ = digits[*ap >> 4];
! 756: *cp++ = digits[*ap++ & 0xf];
! 757: *cp++ = ':';
! 758: }
! 759: *--cp = 0;
! 760: return (etherbuf);
! 761: }
! 762:
! 763: /*
! 764: * Perform common duties while attaching to interface list
! 765: */
! 766: void
! 767: ether_ifattach(ifp)
! 768: struct ifnet *ifp;
! 769: {
! 770:
! 771: /*
! 772: * Any interface which provides a MAC address which is obviously
! 773: * invalid gets whacked, so that users will notice.
! 774: */
! 775: if (ETHER_IS_MULTICAST(((struct arpcom *)ifp)->ac_enaddr)) {
! 776: ((struct arpcom *)ifp)->ac_enaddr[0] = 0x00;
! 777: ((struct arpcom *)ifp)->ac_enaddr[1] = 0xfe;
! 778: ((struct arpcom *)ifp)->ac_enaddr[2] = 0xe1;
! 779: ((struct arpcom *)ifp)->ac_enaddr[3] = 0xba;
! 780: ((struct arpcom *)ifp)->ac_enaddr[4] = 0xd0;
! 781: /*
! 782: * XXX use of random() by anything except the scheduler is
! 783: * normally invalid, but this is boot time, so pre-scheduler,
! 784: * and the random subsystem is not alive yet
! 785: */
! 786: ((struct arpcom *)ifp)->ac_enaddr[5] = (u_char)random() & 0xff;
! 787: }
! 788:
! 789: ifp->if_type = IFT_ETHER;
! 790: ifp->if_addrlen = ETHER_ADDR_LEN;
! 791: ifp->if_hdrlen = ETHER_HDR_LEN;
! 792: ifp->if_mtu = ETHERMTU;
! 793: ifp->if_output = ether_output;
! 794:
! 795: if (ifp->if_hardmtu == 0)
! 796: ifp->if_hardmtu = ETHERMTU;
! 797:
! 798: if_alloc_sadl(ifp);
! 799: bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
! 800: LLADDR(ifp->if_sadl), ifp->if_addrlen);
! 801: LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs);
! 802: #if NBPFILTER > 0
! 803: bpfattach(&ifp->if_bpf, ifp, DLT_EN10MB, ETHER_HDR_LEN);
! 804: #endif
! 805: }
! 806:
! 807: void
! 808: ether_ifdetach(ifp)
! 809: struct ifnet *ifp;
! 810: {
! 811: struct arpcom *ac = (struct arpcom *)ifp;
! 812: struct ether_multi *enm;
! 813:
! 814: for (enm = LIST_FIRST(&ac->ac_multiaddrs);
! 815: enm != LIST_END(&ac->ac_multiaddrs);
! 816: enm = LIST_FIRST(&ac->ac_multiaddrs)) {
! 817: LIST_REMOVE(enm, enm_list);
! 818: free(enm, M_IFMADDR);
! 819: }
! 820:
! 821: #if 0
! 822: /* moved to if_detach() */
! 823: if_free_sadl(ifp);
! 824: #endif
! 825: }
! 826:
! 827: #if 0
! 828: /*
! 829: * This is for reference. We have table-driven versions of the
! 830: * crc32 generators, which are faster than the double-loop.
! 831: */
! 832: u_int32_t
! 833: ether_crc32_le(const u_int8_t *buf, size_t len)
! 834: {
! 835: u_int32_t c, crc, carry;
! 836: size_t i, j;
! 837:
! 838: crc = 0xffffffffU; /* initial value */
! 839:
! 840: for (i = 0; i < len; i++) {
! 841: c = buf[i];
! 842: for (j = 0; j < 8; j++) {
! 843: carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
! 844: crc >>= 1;
! 845: c >>= 1;
! 846: if (carry)
! 847: crc = (crc ^ ETHER_CRC_POLY_LE);
! 848: }
! 849: }
! 850:
! 851: return (crc);
! 852: }
! 853:
! 854: u_int32_t
! 855: ether_crc32_be(const u_int8_t *buf, size_t len)
! 856: {
! 857: u_int32_t c, crc, carry;
! 858: size_t i, j;
! 859:
! 860: crc = 0xffffffffU; /* initial value */
! 861:
! 862: for (i = 0; i < len; i++) {
! 863: c = buf[i];
! 864: for (j = 0; j < 8; j++) {
! 865: carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
! 866: crc <<= 1;
! 867: c >>= 1;
! 868: if (carry)
! 869: crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
! 870: }
! 871: }
! 872:
! 873: return (crc);
! 874: }
! 875: #else
! 876: u_int32_t
! 877: ether_crc32_le(const u_int8_t *buf, size_t len)
! 878: {
! 879: static const u_int32_t crctab[] = {
! 880: 0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
! 881: 0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
! 882: 0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
! 883: 0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
! 884: };
! 885: size_t i;
! 886: u_int32_t crc;
! 887:
! 888: crc = 0xffffffffU; /* initial value */
! 889:
! 890: for (i = 0; i < len; i++) {
! 891: crc ^= buf[i];
! 892: crc = (crc >> 4) ^ crctab[crc & 0xf];
! 893: crc = (crc >> 4) ^ crctab[crc & 0xf];
! 894: }
! 895:
! 896: return (crc);
! 897: }
! 898:
! 899: u_int32_t
! 900: ether_crc32_be(const u_int8_t *buf, size_t len)
! 901: {
! 902: static const u_int8_t rev[] = {
! 903: 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
! 904: 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf
! 905: };
! 906: static const u_int32_t crctab[] = {
! 907: 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
! 908: 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
! 909: 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
! 910: 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd
! 911: };
! 912: size_t i;
! 913: u_int32_t crc;
! 914: u_int8_t data;
! 915:
! 916: crc = 0xffffffffU; /* initial value */
! 917: for (i = 0; i < len; i++) {
! 918: data = buf[i];
! 919: crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data & 0xf]];
! 920: crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data >> 4]];
! 921: }
! 922:
! 923: return (crc);
! 924: }
! 925: #endif
! 926:
! 927: #ifdef INET
! 928: u_char ether_ipmulticast_min[ETHER_ADDR_LEN] =
! 929: { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
! 930: u_char ether_ipmulticast_max[ETHER_ADDR_LEN] =
! 931: { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
! 932: #endif
! 933:
! 934: #ifdef INET6
! 935: u_char ether_ip6multicast_min[ETHER_ADDR_LEN] =
! 936: { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 };
! 937: u_char ether_ip6multicast_max[ETHER_ADDR_LEN] =
! 938: { 0x33, 0x33, 0xff, 0xff, 0xff, 0xff };
! 939: #endif
! 940:
! 941: /*
! 942: * Convert a sockaddr into an Ethernet address or range of Ethernet
! 943: * addresses.
! 944: */
! 945: int
! 946: ether_multiaddr(struct sockaddr *sa, u_int8_t addrlo[ETHER_ADDR_LEN],
! 947: u_int8_t addrhi[ETHER_ADDR_LEN])
! 948: {
! 949: #ifdef INET
! 950: struct sockaddr_in *sin;
! 951: #endif /* INET */
! 952: #ifdef INET6
! 953: struct sockaddr_in6 *sin6;
! 954: #endif /* INET6 */
! 955:
! 956: switch (sa->sa_family) {
! 957:
! 958: case AF_UNSPEC:
! 959: bcopy(sa->sa_data, addrlo, ETHER_ADDR_LEN);
! 960: bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
! 961: break;
! 962:
! 963: #ifdef INET
! 964: case AF_INET:
! 965: sin = satosin(sa);
! 966: if (sin->sin_addr.s_addr == INADDR_ANY) {
! 967: /*
! 968: * An IP address of INADDR_ANY means listen to
! 969: * or stop listening to all of the Ethernet
! 970: * multicast addresses used for IP.
! 971: * (This is for the sake of IP multicast routers.)
! 972: */
! 973: bcopy(ether_ipmulticast_min, addrlo, ETHER_ADDR_LEN);
! 974: bcopy(ether_ipmulticast_max, addrhi, ETHER_ADDR_LEN);
! 975: } else {
! 976: ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
! 977: bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
! 978: }
! 979: break;
! 980: #endif
! 981: #ifdef INET6
! 982: case AF_INET6:
! 983: sin6 = satosin6(sa);
! 984: if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
! 985: /*
! 986: * An IP6 address of 0 means listen to or stop
! 987: * listening to all of the Ethernet multicast
! 988: * address used for IP6.
! 989: *
! 990: * (This might not be healthy, given IPv6's reliance on
! 991: * multicast for things like neighbor discovery.
! 992: * Perhaps initializing all-nodes, solicited nodes, and
! 993: * possibly all-routers for this interface afterwards
! 994: * is not a bad idea.)
! 995: */
! 996:
! 997: bcopy(ether_ip6multicast_min, addrlo, ETHER_ADDR_LEN);
! 998: bcopy(ether_ip6multicast_max, addrhi, ETHER_ADDR_LEN);
! 999: } else {
! 1000: ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, addrlo);
! 1001: bcopy(addrlo, addrhi, ETHER_ADDR_LEN);
! 1002: }
! 1003: break;
! 1004: #endif
! 1005:
! 1006: default:
! 1007: return (EAFNOSUPPORT);
! 1008: }
! 1009: return (0);
! 1010: }
! 1011:
! 1012: /*
! 1013: * Add an Ethernet multicast address or range of addresses to the list for a
! 1014: * given interface.
! 1015: */
! 1016: int
! 1017: ether_addmulti(ifr, ac)
! 1018: struct ifreq *ifr;
! 1019: struct arpcom *ac;
! 1020: {
! 1021: struct ether_multi *enm;
! 1022: u_char addrlo[ETHER_ADDR_LEN];
! 1023: u_char addrhi[ETHER_ADDR_LEN];
! 1024: int s = splnet(), error;
! 1025:
! 1026: error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
! 1027: if (error != 0) {
! 1028: splx(s);
! 1029: return (error);
! 1030: }
! 1031:
! 1032: /*
! 1033: * Verify that we have valid Ethernet multicast addresses.
! 1034: */
! 1035: if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
! 1036: splx(s);
! 1037: return (EINVAL);
! 1038: }
! 1039: /*
! 1040: * See if the address range is already in the list.
! 1041: */
! 1042: ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
! 1043: if (enm != NULL) {
! 1044: /*
! 1045: * Found it; just increment the reference count.
! 1046: */
! 1047: ++enm->enm_refcount;
! 1048: splx(s);
! 1049: return (0);
! 1050: }
! 1051: /*
! 1052: * New address or range; malloc a new multicast record
! 1053: * and link it into the interface's multicast list.
! 1054: */
! 1055: enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
! 1056: if (enm == NULL) {
! 1057: splx(s);
! 1058: return (ENOBUFS);
! 1059: }
! 1060: bcopy(addrlo, enm->enm_addrlo, ETHER_ADDR_LEN);
! 1061: bcopy(addrhi, enm->enm_addrhi, ETHER_ADDR_LEN);
! 1062: enm->enm_ac = ac;
! 1063: enm->enm_refcount = 1;
! 1064: LIST_INSERT_HEAD(&ac->ac_multiaddrs, enm, enm_list);
! 1065: ac->ac_multicnt++;
! 1066: if (bcmp(addrlo, addrhi, ETHER_ADDR_LEN) != 0)
! 1067: ac->ac_multirangecnt++;
! 1068: splx(s);
! 1069: /*
! 1070: * Return ENETRESET to inform the driver that the list has changed
! 1071: * and its reception filter should be adjusted accordingly.
! 1072: */
! 1073: return (ENETRESET);
! 1074: }
! 1075:
! 1076: /*
! 1077: * Delete a multicast address record.
! 1078: */
! 1079: int
! 1080: ether_delmulti(ifr, ac)
! 1081: struct ifreq *ifr;
! 1082: struct arpcom *ac;
! 1083: {
! 1084: struct ether_multi *enm;
! 1085: u_char addrlo[ETHER_ADDR_LEN];
! 1086: u_char addrhi[ETHER_ADDR_LEN];
! 1087: int s = splnet(), error;
! 1088:
! 1089: error = ether_multiaddr(&ifr->ifr_addr, addrlo, addrhi);
! 1090: if (error != 0) {
! 1091: splx(s);
! 1092: return (error);
! 1093: }
! 1094:
! 1095: /*
! 1096: * Look up the address in our list.
! 1097: */
! 1098: ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
! 1099: if (enm == NULL) {
! 1100: splx(s);
! 1101: return (ENXIO);
! 1102: }
! 1103: if (--enm->enm_refcount != 0) {
! 1104: /*
! 1105: * Still some claims to this record.
! 1106: */
! 1107: splx(s);
! 1108: return (0);
! 1109: }
! 1110: /*
! 1111: * No remaining claims to this record; unlink and free it.
! 1112: */
! 1113: LIST_REMOVE(enm, enm_list);
! 1114: free(enm, M_IFMADDR);
! 1115: ac->ac_multicnt--;
! 1116: if (bcmp(addrlo, addrhi, ETHER_ADDR_LEN) != 0)
! 1117: ac->ac_multirangecnt--;
! 1118: splx(s);
! 1119: /*
! 1120: * Return ENETRESET to inform the driver that the list has changed
! 1121: * and its reception filter should be adjusted accordingly.
! 1122: */
! 1123: return (ENETRESET);
! 1124: }
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