552 lines
16 KiB
C
552 lines
16 KiB
C
/* $NetBSD: clnp_input.c,v 1.9 1995/06/13 07:13:18 mycroft Exp $ */
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/*-
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* Copyright (c) 1991, 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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* @(#)clnp_input.c 8.1 (Berkeley) 6/10/93
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*/
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/***********************************************************
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Copyright IBM Corporation 1987
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of IBM not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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/*
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* ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
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*/
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/route.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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#include <netiso/clnp.h>
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#include <netiso/clnl.h>
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#include <netiso/esis.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#include <netiso/eonvar.h>
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#include <netiso/clnp_stat.h>
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#include <netiso/argo_debug.h>
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#ifdef ISO
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u_char clnp_protox[ISOPROTO_MAX];
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struct clnl_protosw clnl_protox[256];
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int clnpqmaxlen = IFQ_MAXLEN; /* RAH? why is this a variable */
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struct mbuf *clnp_data_ck();
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void clnp_input(), esis_input();
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#ifdef ISO_X25ESIS
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void x25esis_input();
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#endif /* ISO_X25ESIS */
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/*
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* FUNCTION: clnp_init
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*
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* PURPOSE: clnp initialization. Fill in clnp switch tables.
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*
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* RETURNS: none
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*
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* SIDE EFFECTS: fills in clnp_protox table with correct offsets into
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* the isosw table.
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*
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* NOTES:
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*/
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void
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clnp_init()
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{
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register struct protosw *pr;
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/*
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* CLNP protox initialization
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*/
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if ((pr = pffindproto(PF_ISO, ISOPROTO_RAW, SOCK_RAW)) == 0)
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printf("clnl_init: no raw CLNP\n");
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else
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clnp_protox[ISOPROTO_RAW] = pr - isosw;
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if ((pr = pffindproto(PF_ISO, ISOPROTO_TP, SOCK_SEQPACKET)) == 0)
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printf("clnl_init: no tp/clnp\n");
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else
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clnp_protox[ISOPROTO_TP] = pr - isosw;
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/*
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* CLNL protox initialization
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*/
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clnl_protox[ISO8473_CLNP].clnl_input = clnp_input;
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clnlintrq.ifq_maxlen = clnpqmaxlen;
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}
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/*
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* FUNCTION: clnlintr
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*
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* PURPOSE: Process a packet on the clnl input queue
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*
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* RETURNS: nothing.
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*
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* SIDE EFFECTS:
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*
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* NOTES:
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*/
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clnlintr()
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{
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register struct mbuf *m; /* ptr to first mbuf of pkt */
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register struct clnl_fixed *clnl; /* ptr to fixed part of clnl hdr */
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int s; /* save and restore priority */
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struct clnl_protosw *clnlsw;/* ptr to protocol switch */
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struct snpa_hdr sh; /* subnetwork hdr */
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/*
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* Get next datagram off clnl input queue
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*/
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next:
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s = splimp();
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/* IF_DEQUEUESNPAHDR(&clnlintrq, m, sh);*/
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IF_DEQUEUE(&clnlintrq, m);
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splx(s);
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if (m == 0) /* nothing to do */
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return;
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if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.rcvif == 0) {
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m_freem(m);
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goto next;
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} else {
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register struct ifaddr *ifa;
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for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; ifa != 0;
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ifa = ifa->ifa_list.tqe_next)
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if (ifa->ifa_addr->sa_family == AF_ISO)
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break;
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if (ifa == 0) {
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m_freem(m);
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goto next;
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}
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}
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bzero((caddr_t)&sh, sizeof(sh));
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sh.snh_flags = m->m_flags & (M_MCAST|M_BCAST);
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switch((sh.snh_ifp = m->m_pkthdr.rcvif)->if_type) {
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extern int ether_output();
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case IFT_EON:
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bcopy(mtod(m, caddr_t), (caddr_t)sh.snh_dhost, sizeof(u_long));
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bcopy(sizeof(u_long) + mtod(m, caddr_t),
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(caddr_t)sh.snh_shost, sizeof(u_long));
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sh.snh_dhost[4] = mtod(m, u_char *)[sizeof(struct ip) +
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_offsetof(struct eon_hdr, eonh_class)];
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m->m_data += EONIPLEN;
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m->m_len -= EONIPLEN;
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m->m_pkthdr.len -= EONIPLEN;
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break;
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default:
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if (sh.snh_ifp->if_output == ether_output) {
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bcopy((caddr_t)(mtod(m, struct ether_header *)->ether_dhost),
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(caddr_t)sh.snh_dhost, 2*sizeof(sh.snh_dhost));
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m->m_data += sizeof (struct ether_header);
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m->m_len -= sizeof (struct ether_header);
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m->m_pkthdr.len -= sizeof (struct ether_header);
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}
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}
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IFDEBUG(D_INPUT)
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int i;
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printf("clnlintr: src:");
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for (i=0; i<6; i++)
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printf("%x%c", sh.snh_shost[i] & 0xff, (i<5) ? ':' : ' ');
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printf(" dst:");
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for (i=0; i<6; i++)
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printf("%x%c", sh.snh_dhost[i] & 0xff, (i<5) ? ':' : ' ');
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printf("\n");
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ENDDEBUG
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/*
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* Get the fixed part of the clnl header into the first mbuf.
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* Drop the packet if this fails.
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* Do not call m_pullup if we have a cluster mbuf or the
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* data is not there.
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*/
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if ((IS_CLUSTER(m) || (m->m_len < sizeof(struct clnl_fixed))) &&
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((m = m_pullup(m, sizeof(struct clnl_fixed))) == 0)) {
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INCSTAT(cns_toosmall); /* TODO: use clnl stats */
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goto next; /* m_pullup discards mbuf */
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}
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clnl = mtod(m, struct clnl_fixed *);
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/*
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* Drop packet if the length of the header is not reasonable.
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*/
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if ((clnl->cnf_hdr_len < CLNP_HDR_MIN) ||
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(clnl->cnf_hdr_len > CLNP_HDR_MAX)) {
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INCSTAT(cns_badhlen); /* TODO: use clnl stats */
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m_freem(m);
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goto next;
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}
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/*
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* If the header is not contained in this mbuf, make it so.
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* Drop packet if this fails.
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* Note: m_pullup will allocate a cluster mbuf if necessary
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*/
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if (clnl->cnf_hdr_len > m->m_len) {
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if ((m = m_pullup(m, (int)clnl->cnf_hdr_len)) == 0) {
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INCSTAT(cns_badhlen); /* TODO: use clnl stats */
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goto next; /* m_pullup discards mbuf */
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}
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clnl = mtod(m, struct clnl_fixed *);
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}
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clnlsw = &clnl_protox[clnl->cnf_proto_id];
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if (clnlsw->clnl_input)
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(*clnlsw->clnl_input) (m, &sh);
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else
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m_freem(m);
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goto next;
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}
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/*
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* FUNCTION: clnp_input
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*
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* PURPOSE: process an incoming clnp packet
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*
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* RETURNS: nothing
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*
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* SIDE EFFECTS: increments fields of clnp_stat structure.
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*
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* NOTES:
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* TODO: I would like to make seg_part a pointer into the mbuf, but
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* will it be correctly aligned?
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*/
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void
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clnp_input(m, shp)
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struct mbuf *m; /* ptr to first mbuf of pkt */
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struct snpa_hdr *shp; /* subnetwork header */
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{
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register struct clnp_fixed *clnp; /* ptr to fixed part of header */
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struct sockaddr_iso source; /* source address of pkt */
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struct sockaddr_iso target; /* destination address of pkt */
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#define src source.siso_addr
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#define dst target.siso_addr
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caddr_t hoff; /* current offset in packet */
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caddr_t hend; /* address of end of header info */
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struct clnp_segment seg_part; /* segment part of hdr */
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int seg_off=0; /* offset of segment part of hdr */
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int seg_len;/* length of packet data&hdr in bytes */
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struct clnp_optidx oidx, *oidxp = NULL; /* option index */
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extern int iso_systype; /* used by ESIS config resp */
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extern struct sockaddr_iso blank_siso; /* used for initializing */
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int need_afrin = 0;
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/* true if congestion experienced */
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/* which means you need afrin nose */
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/* spray. How clever! */
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IFDEBUG(D_INPUT)
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printf(
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"clnp_input: proccessing dg; First mbuf m_len %d, m_type x%x, %s\n",
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m->m_len, m->m_type, IS_CLUSTER(m) ? "cluster" : "normal");
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ENDDEBUG
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need_afrin = 0;
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/*
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* If no iso addresses have been set, there is nothing
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* to do with the packet.
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*/
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if (iso_ifaddr.tqh_first == 0) {
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clnp_discard(m, ADDR_DESTUNREACH);
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return;
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}
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INCSTAT(cns_total);
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clnp = mtod(m, struct clnp_fixed *);
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IFDEBUG(D_DUMPIN)
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struct mbuf *mhead;
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int total_len = 0;
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printf("clnp_input: clnp header:\n");
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dump_buf(mtod(m, caddr_t), clnp->cnf_hdr_len);
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printf("clnp_input: mbuf chain:\n");
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for (mhead = m; mhead != NULL; mhead=mhead->m_next) {
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printf("m x%x, len %d\n", mhead, mhead->m_len);
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total_len += mhead->m_len;
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}
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printf("clnp_input: total length of mbuf chain %d:\n", total_len);
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ENDDEBUG
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/*
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* Compute checksum (if necessary) and drop packet if
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* checksum does not match
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*/
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if (CKSUM_REQUIRED(clnp) && iso_check_csum(m, (int)clnp->cnf_hdr_len)) {
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INCSTAT(cns_badcsum);
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clnp_discard(m, GEN_BADCSUM);
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return;
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}
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if (clnp->cnf_vers != ISO8473_V1) {
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INCSTAT(cns_badvers);
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clnp_discard(m, DISC_UNSUPPVERS);
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return;
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}
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/* check mbuf data length: clnp_data_ck will free mbuf upon error */
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CTOH(clnp->cnf_seglen_msb, clnp->cnf_seglen_lsb, seg_len);
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if ((m = clnp_data_ck(m, seg_len)) == 0)
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return;
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clnp = mtod(m, struct clnp_fixed *);
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hend = (caddr_t)clnp + clnp->cnf_hdr_len;
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/*
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* extract the source and destination address
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* drop packet on failure
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*/
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source = target = blank_siso;
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hoff = (caddr_t)clnp + sizeof(struct clnp_fixed);
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CLNP_EXTRACT_ADDR(dst, hoff, hend);
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if (hoff == (caddr_t)0) {
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INCSTAT(cns_badaddr);
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clnp_discard(m, GEN_INCOMPLETE);
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return;
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}
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CLNP_EXTRACT_ADDR(src, hoff, hend);
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if (hoff == (caddr_t)0) {
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INCSTAT(cns_badaddr);
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clnp_discard(m, GEN_INCOMPLETE);
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return;
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}
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IFDEBUG(D_INPUT)
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printf("clnp_input: from %s", clnp_iso_addrp(&src));
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printf(" to %s\n", clnp_iso_addrp(&dst));
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ENDDEBUG
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/*
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* extract the segmentation information, if it is present.
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* drop packet on failure
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*/
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if (((clnp->cnf_type & CNF_TYPE) != CLNP_ER) &&
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(clnp->cnf_type & CNF_SEG_OK)) {
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if (hoff + sizeof(struct clnp_segment) > hend) {
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INCSTAT(cns_noseg);
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clnp_discard(m, GEN_INCOMPLETE);
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return;
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} else {
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(void) bcopy(hoff, (caddr_t)&seg_part, sizeof(struct clnp_segment));
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/* make sure segmentation fields are in host order */
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seg_part.cng_id = ntohs(seg_part.cng_id);
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seg_part.cng_off = ntohs(seg_part.cng_off);
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seg_part.cng_tot_len = ntohs(seg_part.cng_tot_len);
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seg_off = hoff - (caddr_t)clnp;
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hoff += sizeof(struct clnp_segment);
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}
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}
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/*
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* process options if present. If clnp_opt_sanity returns
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* false (indicating an error was found in the options) or
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* an unsupported option was found
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* then drop packet and emit an ER.
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*/
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if (hoff < hend) {
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int errcode;
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oidxp = &oidx;
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errcode = clnp_opt_sanity(m, hoff, hend-hoff, oidxp);
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/* we do not support security */
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if ((errcode == 0) && (oidxp->cni_securep))
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errcode = DISC_UNSUPPSECURE;
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/* the er option is valid with ER pdus only */
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if ((errcode == 0) && (oidxp->cni_er_reason != ER_INVALREAS) &&
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((clnp->cnf_type & CNF_TYPE) != CLNP_ER))
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errcode = DISC_UNSUPPOPT;
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#ifdef DECBIT
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/* check if the congestion experienced bit is set */
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if (oidxp->cni_qos_formatp) {
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caddr_t qosp = CLNP_OFFTOOPT(m, oidxp->cni_qos_formatp);
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u_char qos = *qosp;
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need_afrin = ((qos & (CLNPOVAL_GLOBAL|CLNPOVAL_CONGESTED)) ==
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(CLNPOVAL_GLOBAL|CLNPOVAL_CONGESTED));
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if (need_afrin)
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INCSTAT(cns_congest_rcvd);
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}
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#endif /* DECBIT */
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if (errcode != 0) {
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clnp_discard(m, (char)errcode);
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IFDEBUG(D_INPUT)
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printf("clnp_input: dropped (err x%x) due to bad options\n",
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errcode);
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ENDDEBUG
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return;
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}
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}
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/*
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* check if this packet is for us. if not, then forward
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*/
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if (clnp_ours(&dst) == 0) {
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IFDEBUG(D_INPUT)
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printf("clnp_input: forwarding packet not for us\n");
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ENDDEBUG
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clnp_forward(m, seg_len, &dst, oidxp, seg_off, shp);
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return;
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}
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/*
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* ESIS Configuration Response Function
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*
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* If the packet received was sent to the multicast address
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* all end systems, then send an esh to the source
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*/
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if ((shp->snh_flags & M_MCAST) && (iso_systype == SNPA_ES)) {
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extern short esis_holding_time;
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esis_shoutput(shp->snh_ifp, ESIS_ESH, esis_holding_time,
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shp->snh_shost, 6, &dst);
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}
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/*
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* If this is a fragment, then try to reassemble it. If clnp_reass
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* returns non NULL, the packet has been reassembled, and should
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* be give to TP. Otherwise the fragment has been delt with
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* by the reassembly code (either stored or deleted). In either case
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* we should have nothing more to do with it.
|
|
*/
|
|
if (((clnp->cnf_type & CNF_TYPE) != CLNP_ER) &&
|
|
(clnp->cnf_type & CNF_SEG_OK) &&
|
|
(seg_len != seg_part.cng_tot_len)) {
|
|
struct mbuf *m0;
|
|
|
|
if ((m0 = clnp_reass(m, &src, &dst, &seg_part)) != NULL) {
|
|
m = m0;
|
|
clnp = mtod(m, struct clnp_fixed *);
|
|
INCSTAT(cns_reassembled);
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* give the packet to the higher layer
|
|
*
|
|
* Note: the total length of packet
|
|
* is the total length field of the segmentation part,
|
|
* or, if absent, the segment length field of the
|
|
* header.
|
|
*/
|
|
INCSTAT(cns_delivered);
|
|
switch (clnp->cnf_type & CNF_TYPE) {
|
|
case CLNP_ER:
|
|
/*
|
|
* This ER must have the er option.
|
|
* If the option is not present, discard datagram.
|
|
*/
|
|
if (oidxp == NULL || oidxp->cni_er_reason == ER_INVALREAS) {
|
|
clnp_discard(m, GEN_HDRSYNTAX);
|
|
} else {
|
|
clnp_er_input(m, &src, oidxp->cni_er_reason);
|
|
}
|
|
break;
|
|
|
|
case CLNP_DT:
|
|
(*isosw[clnp_protox[ISOPROTO_TP]].pr_input)(m, &source, &target,
|
|
clnp->cnf_hdr_len, need_afrin);
|
|
break;
|
|
|
|
case CLNP_RAW:
|
|
case CLNP_ECR:
|
|
IFDEBUG(D_INPUT)
|
|
printf("clnp_input: raw input of %d bytes\n",
|
|
clnp->cnf_type & CNF_SEG_OK ? seg_part.cng_tot_len : seg_len);
|
|
ENDDEBUG
|
|
(*isosw[clnp_protox[ISOPROTO_RAW]].pr_input)(m, &source, &target,
|
|
clnp->cnf_hdr_len);
|
|
break;
|
|
|
|
case CLNP_EC:
|
|
IFDEBUG(D_INPUT)
|
|
printf("clnp_input: echoing packet\n");
|
|
ENDDEBUG
|
|
(void)clnp_echoreply(m,
|
|
(clnp->cnf_type & CNF_SEG_OK ? (int)seg_part.cng_tot_len : seg_len),
|
|
&source, &target, oidxp);
|
|
break;
|
|
|
|
default:
|
|
printf("clnp_input: unknown clnp pkt type %d\n",
|
|
clnp->cnf_type & CNF_TYPE);
|
|
clnp_stat.cns_delivered--;
|
|
clnp_stat.cns_noproto++;
|
|
clnp_discard(m, GEN_HDRSYNTAX);
|
|
break;
|
|
}
|
|
}
|
|
#endif /* ISO */
|