681 lines
17 KiB
C
681 lines
17 KiB
C
/* $NetBSD: if_ethersubr.c,v 1.14 1995/08/19 16:33:17 mycroft Exp $ */
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/*
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* Copyright (c) 1982, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <machine/cpu.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/if_llc.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#endif
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#include <netinet/if_ether.h>
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#ifdef NS
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#endif
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#ifdef ISO
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#include <netiso/argo_debug.h>
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#include <netiso/iso.h>
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#include <netiso/iso_var.h>
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#include <netiso/iso_snpac.h>
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#endif
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#ifdef LLC
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#include <netccitt/dll.h>
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#include <netccitt/llc_var.h>
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#endif
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#if defined(LLC) && defined(CCITT)
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extern struct ifqueue pkintrq;
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#endif
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u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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#define senderr(e) { error = (e); goto bad;}
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/*
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* Ethernet output routine.
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* Encapsulate a packet of type family for the local net.
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* Use trailer local net encapsulation if enough data in first
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* packet leaves a multiple of 512 bytes of data in remainder.
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* Assumes that ifp is actually pointer to arpcom structure.
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*/
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int
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ether_output(ifp, m0, dst, rt0)
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register struct ifnet *ifp;
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struct mbuf *m0;
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struct sockaddr *dst;
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struct rtentry *rt0;
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{
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u_int16_t etype;
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int s, error = 0;
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u_char edst[6];
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register struct mbuf *m = m0;
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register struct rtentry *rt;
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struct mbuf *mcopy = (struct mbuf *)0;
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register struct ether_header *eh;
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struct arpcom *ac = (struct arpcom *)ifp;
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
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senderr(ENETDOWN);
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ifp->if_lastchange = time;
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if (rt = rt0) {
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if ((rt->rt_flags & RTF_UP) == 0) {
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if (rt0 = rt = rtalloc1(dst, 1))
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rt->rt_refcnt--;
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else
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senderr(EHOSTUNREACH);
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}
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if (rt->rt_flags & RTF_GATEWAY) {
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if (rt->rt_gwroute == 0)
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goto lookup;
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if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
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rtfree(rt); rt = rt0;
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lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
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if ((rt = rt->rt_gwroute) == 0)
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senderr(EHOSTUNREACH);
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}
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}
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if (rt->rt_flags & RTF_REJECT)
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if (rt->rt_rmx.rmx_expire == 0 ||
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time.tv_sec < rt->rt_rmx.rmx_expire)
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senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
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}
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switch (dst->sa_family) {
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#ifdef INET
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case AF_INET:
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if (!arpresolve(ac, rt, m, dst, edst))
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return (0); /* if not yet resolved */
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/* If broadcasting on a simplex interface, loopback a copy */
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if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
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mcopy = m_copy(m, 0, (int)M_COPYALL);
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etype = ETHERTYPE_IP;
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break;
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#endif
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#ifdef NS
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case AF_NS:
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etype = ETHERTYPE_NS;
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bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),
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(caddr_t)edst, sizeof (edst));
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if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst)))
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return (looutput(ifp, m, dst, rt));
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/* If broadcasting on a simplex interface, loopback a copy */
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if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
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mcopy = m_copy(m, 0, (int)M_COPYALL);
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break;
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#endif
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#ifdef ISO
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case AF_ISO: {
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int snpalen;
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struct llc *l;
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register struct sockaddr_dl *sdl;
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if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&
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sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) {
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bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));
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} else if (error =
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iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
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(char *)edst, &snpalen))
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goto bad; /* Not Resolved */
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/* If broadcasting on a simplex interface, loopback a copy */
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if (*edst & 1)
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m->m_flags |= (M_BCAST|M_MCAST);
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if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&
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(mcopy = m_copy(m, 0, (int)M_COPYALL))) {
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M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
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if (mcopy) {
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eh = mtod(mcopy, struct ether_header *);
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bcopy((caddr_t)edst,
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(caddr_t)eh->ether_dhost, sizeof (edst));
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bcopy((caddr_t)ac->ac_enaddr,
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(caddr_t)eh->ether_shost, sizeof (edst));
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}
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}
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M_PREPEND(m, 3, M_DONTWAIT);
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if (m == NULL)
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return (0);
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etype = m->m_pkthdr.len;
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l = mtod(m, struct llc *);
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l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;
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l->llc_control = LLC_UI;
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IFDEBUG(D_ETHER)
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int i;
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printf("unoutput: sending pkt to: ");
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for (i=0; i<6; i++)
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printf("%x ", edst[i] & 0xff);
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printf("\n");
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ENDDEBUG
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} break;
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#endif /* ISO */
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#ifdef LLC
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/* case AF_NSAP: */
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case AF_CCITT: {
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register struct sockaddr_dl *sdl =
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(struct sockaddr_dl *) rt -> rt_gateway;
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if (sdl && sdl->sdl_family == AF_LINK
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&& sdl->sdl_alen > 0) {
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bcopy(LLADDR(sdl), (char *)edst,
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sizeof(edst));
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} else goto bad; /* Not a link interface ? Funny ... */
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if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) &&
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(mcopy = m_copy(m, 0, (int)M_COPYALL))) {
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M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);
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if (mcopy) {
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eh = mtod(mcopy, struct ether_header *);
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bcopy((caddr_t)edst,
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(caddr_t)eh->ether_dhost, sizeof (edst));
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bcopy((caddr_t)ac->ac_enaddr,
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(caddr_t)eh->ether_shost, sizeof (edst));
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}
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}
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etype = m->m_pkthdr.len;
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#ifdef LLC_DEBUG
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{
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int i;
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register struct llc *l = mtod(m, struct llc *);
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printf("ether_output: sending LLC2 pkt to: ");
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for (i=0; i<6; i++)
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printf("%x ", edst[i] & 0xff);
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printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n",
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etype & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff,
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l->llc_control & 0xff);
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}
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#endif /* LLC_DEBUG */
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} break;
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#endif /* LLC */
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case AF_UNSPEC:
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eh = (struct ether_header *)dst->sa_data;
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bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));
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/* AF_UNSPEC doesn't swap the byte order of the ether_type. */
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etype = ntohs(eh->ether_type);
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break;
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default:
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printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
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dst->sa_family);
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senderr(EAFNOSUPPORT);
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}
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if (mcopy)
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(void) looutput(ifp, mcopy, dst, rt);
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/*
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* Add local net header. If no space in first mbuf,
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* allocate another.
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*/
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M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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eh = mtod(m, struct ether_header *);
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etype = htons(etype);
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bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type,
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sizeof(eh->ether_type));
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bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));
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bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,
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sizeof(eh->ether_shost));
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s = splimp();
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/*
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* Queue message on interface, and start output if interface
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* not yet active.
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*/
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if (IF_QFULL(&ifp->if_snd)) {
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IF_DROP(&ifp->if_snd);
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splx(s);
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senderr(ENOBUFS);
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}
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ifp->if_obytes += m->m_pkthdr.len;
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IF_ENQUEUE(&ifp->if_snd, m);
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if ((ifp->if_flags & IFF_OACTIVE) == 0)
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(*ifp->if_start)(ifp);
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splx(s);
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if (m->m_flags & M_MCAST)
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ifp->if_omcasts++;
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return (error);
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bad:
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if (m)
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m_freem(m);
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return (error);
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}
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/*
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* Process a received Ethernet packet;
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* the packet is in the mbuf chain m without
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* the ether header, which is provided separately.
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*/
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void
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ether_input(ifp, eh, m)
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struct ifnet *ifp;
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register struct ether_header *eh;
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struct mbuf *m;
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{
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register struct ifqueue *inq;
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register struct llc *l;
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u_int16_t etype;
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struct arpcom *ac = (struct arpcom *)ifp;
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int s;
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if ((ifp->if_flags & IFF_UP) == 0) {
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m_freem(m);
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return;
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}
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ifp->if_lastchange = time;
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ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
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if (eh->ether_dhost[0] & 1) {
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if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
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sizeof(etherbroadcastaddr)) == 0)
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m->m_flags |= M_BCAST;
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else
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m->m_flags |= M_MCAST;
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}
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if (m->m_flags & (M_BCAST|M_MCAST))
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ifp->if_imcasts++;
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etype = ntohs(eh->ether_type);
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switch (etype) {
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#ifdef INET
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case ETHERTYPE_IP:
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schednetisr(NETISR_IP);
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inq = &ipintrq;
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break;
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case ETHERTYPE_ARP:
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schednetisr(NETISR_ARP);
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inq = &arpintrq;
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break;
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case ETHERTYPE_REVARP:
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revarpinput(m); /* XXX queue? */
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return;
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#endif
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#ifdef NS
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case ETHERTYPE_NS:
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schednetisr(NETISR_NS);
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inq = &nsintrq;
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break;
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#endif
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default:
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#if defined (ISO) || defined (LLC)
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if (etype > ETHERMTU)
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goto dropanyway;
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l = mtod(m, struct llc *);
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switch (l->llc_dsap) {
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#ifdef ISO
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case LLC_ISO_LSAP:
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switch (l->llc_control) {
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case LLC_UI:
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/* LLC_UI_P forbidden in class 1 service */
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if ((l->llc_dsap == LLC_ISO_LSAP) &&
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(l->llc_ssap == LLC_ISO_LSAP)) {
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/* LSAP for ISO */
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if (m->m_pkthdr.len > etype)
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m_adj(m, etype - m->m_pkthdr.len);
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m->m_data += 3; /* XXX */
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m->m_len -= 3; /* XXX */
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m->m_pkthdr.len -= 3; /* XXX */
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M_PREPEND(m, sizeof *eh, M_DONTWAIT);
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if (m == 0)
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return;
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*mtod(m, struct ether_header *) = *eh;
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IFDEBUG(D_ETHER)
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printf("clnp packet");
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ENDDEBUG
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schednetisr(NETISR_ISO);
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inq = &clnlintrq;
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break;
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}
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goto dropanyway;
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case LLC_XID:
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case LLC_XID_P:
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if(m->m_len < 6)
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goto dropanyway;
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l->llc_window = 0;
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l->llc_fid = 9;
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l->llc_class = 1;
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l->llc_dsap = l->llc_ssap = 0;
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/* Fall through to */
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case LLC_TEST:
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case LLC_TEST_P:
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{
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struct sockaddr sa;
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register struct ether_header *eh2;
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int i;
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u_char c = l->llc_dsap;
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l->llc_dsap = l->llc_ssap;
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l->llc_ssap = c;
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if (m->m_flags & (M_BCAST | M_MCAST))
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bcopy((caddr_t)ac->ac_enaddr,
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(caddr_t)eh->ether_dhost, 6);
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sa.sa_family = AF_UNSPEC;
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sa.sa_len = sizeof(sa);
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eh2 = (struct ether_header *)sa.sa_data;
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for (i = 0; i < 6; i++) {
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eh2->ether_shost[i] = c = eh->ether_dhost[i];
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eh2->ether_dhost[i] =
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eh->ether_dhost[i] = eh->ether_shost[i];
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eh->ether_shost[i] = c;
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}
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ifp->if_output(ifp, m, &sa, NULL);
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return;
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}
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default:
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m_freem(m);
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return;
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}
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break;
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#endif /* ISO */
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#ifdef LLC
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case LLC_X25_LSAP:
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{
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if (m->m_pkthdr.len > etype)
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m_adj(m, etype - m->m_pkthdr.len);
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M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT);
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if (m == 0)
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return;
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if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP,
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eh->ether_dhost, LLC_X25_LSAP, 6,
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mtod(m, struct sdl_hdr *)))
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panic("ETHER cons addr failure");
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mtod(m, struct sdl_hdr *)->sdlhdr_len = etype;
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#ifdef LLC_DEBUG
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printf("llc packet\n");
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#endif /* LLC_DEBUG */
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schednetisr(NETISR_CCITT);
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inq = &llcintrq;
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break;
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}
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#endif /* LLC */
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dropanyway:
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default:
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m_freem(m);
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return;
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}
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#else /* ISO || LLC */
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m_freem(m);
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return;
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#endif /* ISO || LLC */
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}
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s = splimp();
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if (IF_QFULL(inq)) {
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IF_DROP(inq);
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m_freem(m);
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} else
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IF_ENQUEUE(inq, m);
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splx(s);
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}
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/*
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* Convert Ethernet address to printable (loggable) representation.
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*/
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static char digits[] = "0123456789abcdef";
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char *
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ether_sprintf(ap)
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register u_char *ap;
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{
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register i;
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static char etherbuf[18];
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register char *cp = etherbuf;
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for (i = 0; i < 6; i++) {
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*cp++ = digits[*ap >> 4];
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*cp++ = digits[*ap++ & 0xf];
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*cp++ = ':';
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}
|
|
*--cp = 0;
|
|
return (etherbuf);
|
|
}
|
|
|
|
/*
|
|
* Perform common duties while attaching to interface list
|
|
*/
|
|
void
|
|
ether_ifattach(ifp)
|
|
register struct ifnet *ifp;
|
|
{
|
|
register struct ifaddr *ifa;
|
|
register struct sockaddr_dl *sdl;
|
|
|
|
ifp->if_type = IFT_ETHER;
|
|
ifp->if_addrlen = 6;
|
|
ifp->if_hdrlen = 14;
|
|
ifp->if_mtu = ETHERMTU;
|
|
ifp->if_output = ether_output;
|
|
for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
|
|
ifa = ifa->ifa_list.tqe_next)
|
|
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
|
|
sdl->sdl_family == AF_LINK) {
|
|
sdl->sdl_type = IFT_ETHER;
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
|
|
LLADDR(sdl), ifp->if_addrlen);
|
|
break;
|
|
}
|
|
LIST_INIT(&((struct arpcom *)ifp)->ac_multiaddrs);
|
|
}
|
|
|
|
u_char ether_ipmulticast_min[6] = { 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
|
|
u_char ether_ipmulticast_max[6] = { 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
|
|
/*
|
|
* Add an Ethernet multicast address or range of addresses to the list for a
|
|
* given interface.
|
|
*/
|
|
int
|
|
ether_addmulti(ifr, ac)
|
|
struct ifreq *ifr;
|
|
register struct arpcom *ac;
|
|
{
|
|
register struct ether_multi *enm;
|
|
struct sockaddr_in *sin;
|
|
u_char addrlo[6];
|
|
u_char addrhi[6];
|
|
int s = splimp();
|
|
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
|
|
case AF_UNSPEC:
|
|
bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
|
|
bcopy(addrlo, addrhi, 6);
|
|
break;
|
|
|
|
#ifdef INET
|
|
case AF_INET:
|
|
sin = (struct sockaddr_in *)&(ifr->ifr_addr);
|
|
if (sin->sin_addr.s_addr == INADDR_ANY) {
|
|
/*
|
|
* An IP address of INADDR_ANY means listen to all
|
|
* of the Ethernet multicast addresses used for IP.
|
|
* (This is for the sake of IP multicast routers.)
|
|
*/
|
|
bcopy(ether_ipmulticast_min, addrlo, 6);
|
|
bcopy(ether_ipmulticast_max, addrhi, 6);
|
|
}
|
|
else {
|
|
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
|
|
bcopy(addrlo, addrhi, 6);
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
splx(s);
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
|
|
/*
|
|
* Verify that we have valid Ethernet multicast addresses.
|
|
*/
|
|
if ((addrlo[0] & 0x01) != 1 || (addrhi[0] & 0x01) != 1) {
|
|
splx(s);
|
|
return (EINVAL);
|
|
}
|
|
/*
|
|
* See if the address range is already in the list.
|
|
*/
|
|
ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
|
|
if (enm != NULL) {
|
|
/*
|
|
* Found it; just increment the reference count.
|
|
*/
|
|
++enm->enm_refcount;
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
/*
|
|
* New address or range; malloc a new multicast record
|
|
* and link it into the interface's multicast list.
|
|
*/
|
|
enm = (struct ether_multi *)malloc(sizeof(*enm), M_IFMADDR, M_NOWAIT);
|
|
if (enm == NULL) {
|
|
splx(s);
|
|
return (ENOBUFS);
|
|
}
|
|
bcopy(addrlo, enm->enm_addrlo, 6);
|
|
bcopy(addrhi, enm->enm_addrhi, 6);
|
|
enm->enm_ac = ac;
|
|
enm->enm_refcount = 1;
|
|
LIST_INSERT_HEAD(&ac->ac_multiaddrs, enm, enm_list);
|
|
ac->ac_multicnt++;
|
|
splx(s);
|
|
/*
|
|
* Return ENETRESET to inform the driver that the list has changed
|
|
* and its reception filter should be adjusted accordingly.
|
|
*/
|
|
return (ENETRESET);
|
|
}
|
|
|
|
/*
|
|
* Delete a multicast address record.
|
|
*/
|
|
int
|
|
ether_delmulti(ifr, ac)
|
|
struct ifreq *ifr;
|
|
register struct arpcom *ac;
|
|
{
|
|
register struct ether_multi *enm;
|
|
register struct ether_multi **p;
|
|
struct sockaddr_in *sin;
|
|
u_char addrlo[6];
|
|
u_char addrhi[6];
|
|
int s = splimp();
|
|
|
|
switch (ifr->ifr_addr.sa_family) {
|
|
|
|
case AF_UNSPEC:
|
|
bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
|
|
bcopy(addrlo, addrhi, 6);
|
|
break;
|
|
|
|
#ifdef INET
|
|
case AF_INET:
|
|
sin = (struct sockaddr_in *)&(ifr->ifr_addr);
|
|
if (sin->sin_addr.s_addr == INADDR_ANY) {
|
|
/*
|
|
* An IP address of INADDR_ANY means stop listening
|
|
* to the range of Ethernet multicast addresses used
|
|
* for IP.
|
|
*/
|
|
bcopy(ether_ipmulticast_min, addrlo, 6);
|
|
bcopy(ether_ipmulticast_max, addrhi, 6);
|
|
}
|
|
else {
|
|
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
|
|
bcopy(addrlo, addrhi, 6);
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
splx(s);
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
|
|
/*
|
|
* Look up the address in our list.
|
|
*/
|
|
ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
|
|
if (enm == NULL) {
|
|
splx(s);
|
|
return (ENXIO);
|
|
}
|
|
if (--enm->enm_refcount != 0) {
|
|
/*
|
|
* Still some claims to this record.
|
|
*/
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
/*
|
|
* No remaining claims to this record; unlink and free it.
|
|
*/
|
|
LIST_REMOVE(enm, enm_list);
|
|
free(enm, M_IFMADDR);
|
|
ac->ac_multicnt--;
|
|
splx(s);
|
|
/*
|
|
* Return ENETRESET to inform the driver that the list has changed
|
|
* and its reception filter should be adjusted accordingly.
|
|
*/
|
|
return (ENETRESET);
|
|
}
|