418 lines
11 KiB
C
418 lines
11 KiB
C
/*
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* Copyright (c) 1982, 1989 Regents of the University of California.
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* 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 7.13 (Berkeley) 4/20/91
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*/
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#include "param.h"
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#include "systm.h"
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#include "kernel.h"
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#include "malloc.h"
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#include "mbuf.h"
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#include "protosw.h"
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#include "socket.h"
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#include "ioctl.h"
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#include "errno.h"
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#include "syslog.h"
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#include "if.h"
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#include "netisr.h"
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#include "route.h"
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#include "if_llc.h"
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#include "if_dl.h"
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#include "machine/mtpr.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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u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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extern struct ifnet loif;
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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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ether_output(ifp, m0, dst, rt)
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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 *rt;
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{
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short type;
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int s, error = 0;
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u_char edst[6];
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struct in_addr idst;
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register struct mbuf *m = m0;
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struct mbuf *mcopy = (struct mbuf *)0;
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register struct ether_header *eh;
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int usetrailers, off, len = m->m_pkthdr.len;
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#define ac ((struct arpcom *)ifp)
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if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
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error = ENETDOWN;
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goto bad;
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}
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ifp->if_lastchange = time;
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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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idst = ((struct sockaddr_in *)dst)->sin_addr;
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if (!arpresolve(ac, m, &idst, edst, &usetrailers))
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return (0); /* if not yet resolved */
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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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off = m->m_pkthdr.len - m->m_len;
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if (usetrailers && off > 0 && (off & 0x1ff) == 0 &&
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(m->m_flags & M_EXT) == 0 &&
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m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) {
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type = ETHERTYPE_TRAIL + (off>>9);
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m->m_data -= 2 * sizeof (u_short);
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m->m_len += 2 * sizeof (u_short);
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len += 2 * sizeof (u_short);
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*mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP);
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*(mtod(m, u_short *) + 1) = htons((u_short)m->m_len);
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goto gottrailertype;
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}
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type = ETHERTYPE_IP;
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goto gottype;
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#endif
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#ifdef NS
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case AF_NS:
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type = 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 ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1))
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mcopy = m_copy(m, 0, (int)M_COPYALL);
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goto gottype;
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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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iso_again:
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if (rt && rt->rt_gateway && (rt->rt_flags & RTF_UP)) {
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if (rt->rt_flags & RTF_GATEWAY) {
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if (rt->rt_llinfo) {
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rt = (struct rtentry *)rt->rt_llinfo;
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goto iso_again;
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}
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} else {
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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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goto iso_resolved;
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}
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}
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}
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if ((error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst,
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(char *)edst, &snpalen)) > 0)
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goto bad; /* Not Resolved */
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iso_resolved:
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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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M_PREPEND(m, 3, M_DONTWAIT);
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if (m == NULL)
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return (0);
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type = 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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len += 3;
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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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} goto gottype;
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#endif ISO
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#ifdef RMP
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case AF_RMP:
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/*
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* This is IEEE 802.3 -- the Ethernet `type' field is
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* really a `length' field.
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*/
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type = m->m_len;
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bcopy((caddr_t)dst->sa_data, (caddr_t)edst, sizeof(edst));
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break;
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#endif
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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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type = eh->ether_type;
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goto gottype;
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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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error = EAFNOSUPPORT;
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goto bad;
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}
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gottrailertype:
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/*
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* Packet to be sent as trailer: move first packet
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* (control information) to end of chain.
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*/
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while (m->m_next)
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m = m->m_next;
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m->m_next = m0;
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m = m0->m_next;
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m0->m_next = 0;
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gottype:
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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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error = ENOBUFS;
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goto bad;
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}
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eh = mtod(m, struct ether_header *);
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type = htons((u_short)type);
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bcopy((caddr_t)&type,(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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error = ENOBUFS;
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goto bad;
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}
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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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ifp->if_obytes += len + sizeof (struct ether_header);
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if (edst[0] & 1)
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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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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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int s;
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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 (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 if (eh->ether_dhost[0] & 1)
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m->m_flags |= M_MCAST;
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if (m->m_flags & (M_BCAST|M_MCAST))
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ifp->if_imcasts++;
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switch (eh->ether_type) {
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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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arpinput((struct arpcom *)ifp, m);
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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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#ifdef ISO
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if (eh->ether_type > ETHERMTU)
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goto dropanyway;
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l = mtod(m, struct llc *);
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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 > eh->ether_type)
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m_adj(m, eh->ether_type - 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);
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return;
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}
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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
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m_freem(m);
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return;
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#endif ISO
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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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}
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*--cp = 0;
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return (etherbuf);
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}
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