411 lines
11 KiB
C
411 lines
11 KiB
C
/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck Exp $ */
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/*
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*
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* Copyright (c) 1996 Charles D. Cranor and Washington University.
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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 Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* if_atmsubr.c
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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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#if defined(__FreeBSD__)
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#include <sys/sockio.h>
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#else
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#include <sys/ioctl.h>
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#endif
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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_dl.h>
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#include <net/if_types.h>
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#include <net/if_atm.h>
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#include <netinet/in.h>
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#include <netinet/if_atm.h>
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#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
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#ifdef INET
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#include <netinet/in_var.h>
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#endif
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#ifdef NATM
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#include <netnatm/natm.h>
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#endif
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#include "bpfilter.h"
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#if NBPFILTER > 0
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/*
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* bpf support.
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* the code is derived from if_loop.c.
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* bpf support should belong to the driver but it's easier to implement
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* it here since we can call bpf_mtap before atm_output adds a pseudo
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* header to the mbuf.
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* --kjc
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*/
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#include <sys/time.h>
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#include <net/bpf.h>
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#endif /* NBPFILTER > 0 */
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#define senderr(e) { error = (e); goto bad;}
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/*
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* atm_output: ATM output routine
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* inputs:
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* "ifp" = ATM interface to output to
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* "m0" = the packet to output
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* "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
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* "rt0" = the route to use
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* returns: error code [0 == ok]
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*
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* note: special semantic: if (dst == NULL) then we assume "m" already
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* has an atm_pseudohdr on it and just send it directly.
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* [for native mode ATM output] if dst is null, then
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* rt0 must also be NULL.
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*/
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int
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atm_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 = 0; /* if using LLC/SNAP */
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int s, error = 0, sz;
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struct atm_pseudohdr atmdst, *ad;
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register struct mbuf *m = m0;
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register struct rtentry *rt;
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struct atmllc *atmllc;
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u_int32_t atm_flags;
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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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/*
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* check route
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*/
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if ((rt = rt0) != NULL) {
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if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
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if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
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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, 0);
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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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/* XXX: put RTF_REJECT code here if doing ATMARP */
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}
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/*
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* check for non-native ATM traffic (dst != NULL)
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*/
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if (dst) {
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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 (!atmresolve(rt, m, dst, &atmdst)) {
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m = NULL;
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/* XXX: atmresolve already free'd it */
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senderr(EHOSTUNREACH);
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/* XXX: put ATMARP stuff here */
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/* XXX: watch who frees m on failure */
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}
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etype = htons(ETHERTYPE_IP);
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break;
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#endif
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default:
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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printf("%s: can't handle af%d\n", ifp->if_xname,
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dst->sa_family);
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#elif defined(__FreeBSD__) || defined(__bsdi__)
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printf("%s%d: can't handle af%d\n", ifp->if_name,
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ifp->if_unit, dst->sa_family);
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#endif
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senderr(EAFNOSUPPORT);
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}
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#if NBPFILTER > 0
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/* BPF write needs to be handled specially */
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if (dst && dst->sa_family == AF_UNSPEC) {
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dst->sa_family = *(mtod(m, int *));
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m->m_len -= sizeof(int);
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m->m_pkthdr.len -= sizeof(int);
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m->m_data += sizeof(int);
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}
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if (ifp->if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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struct mbuf m1;
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u_int af = dst->sa_family;
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m1.m_next = m;
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m1.m_len = 4;
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m1.m_data = (char *)⁡
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s = splimp();
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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bpf_mtap(&ifp->if_bpf, &m0);
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#elif defined(__FreeBSD__)
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bpf_mtap(ifp, &m1);
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#endif
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splx(s);
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}
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#endif /* NBPFILTER > 0 */
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/*
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* must add atm_pseudohdr to data
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*/
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sz = sizeof(atmdst);
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atm_flags = ATM_PH_FLAGS(&atmdst);
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if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
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M_PREPEND(m, sz, M_DONTWAIT);
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if (m == 0)
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senderr(ENOBUFS);
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ad = mtod(m, struct atm_pseudohdr *);
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*ad = atmdst;
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if (atm_flags & ATM_PH_LLCSNAP) {
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atmllc = (struct atmllc *)(ad + 1);
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bcopy(ATMLLC_HDR, atmllc->llchdr,
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sizeof(atmllc->llchdr));
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ATM_LLC_SETTYPE(atmllc, etype);
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/* note: already in network order */
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}
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}
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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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s = splimp();
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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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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 ATM packet;
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* the packet is in the mbuf chain m.
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*/
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void
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atm_input(ifp, ah, m, rxhand)
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struct ifnet *ifp;
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register struct atm_pseudohdr *ah;
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struct mbuf *m;
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void *rxhand;
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{
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register struct ifqueue *inq;
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u_int16_t etype = ETHERTYPE_IP; /* default */
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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;
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#if NBPFILTER > 0
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if (ifp->if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer to it).
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*/
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struct mbuf m0;
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u_int af = AF_INET;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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bpf_mtap(&ifp->if_bpf, &m0);
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#elif defined(__FreeBSD__)
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bpf_mtap(ifp, &m0);
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#endif
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}
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#endif /* NBPFILTER > 0 */
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if (rxhand) {
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#ifdef NATM
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struct natmpcb *npcb = rxhand;
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s = splimp(); /* in case 2 atm cards @ diff lvls */
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npcb->npcb_inq++; /* count # in queue */
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splx(s);
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schednetisr(NETISR_NATM);
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inq = &natmintrq;
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m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
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#else
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printf("atm_input: NATM detected but not configured in kernel\n");
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m_freem(m);
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return;
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#endif
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} else {
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/*
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* handle LLC/SNAP header, if present
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*/
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if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
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struct atmllc *alc;
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if (m->m_len < sizeof(*alc) && (m = m_pullup(m, sizeof(*alc))) == 0)
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return; /* failed */
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alc = mtod(m, struct atmllc *);
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if (bcmp(alc, ATMLLC_HDR, 6)) {
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
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ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
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#elif defined(__FreeBSD__) || defined(__bsdi__)
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printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
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ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
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#endif
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m_freem(m);
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return;
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}
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etype = ATM_LLC_TYPE(alc);
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m_adj(m, sizeof(*alc));
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}
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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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#endif
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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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}
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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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* Perform common duties while attaching to interface list
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*/
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void
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atm_ifattach(ifp)
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register struct ifnet *ifp;
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{
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register struct ifaddr *ifa;
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register struct sockaddr_dl *sdl;
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ifp->if_type = IFT_ATM;
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ifp->if_addrlen = 0;
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ifp->if_hdrlen = 0;
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ifp->if_mtu = ATMMTU;
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ifp->if_output = atm_output;
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
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ifa = ifa->ifa_list.tqe_next)
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#elif defined(__FreeBSD__) && ((__FreeBSD__ > 2) || defined(_NET_IF_VAR_H_))
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/*
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* for FreeBSD-3.0. 3.0-SNAP-970124 still sets -D__FreeBSD__=2!
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* XXX -- for now, use newly-introduced "net/if_var.h" as an identifier.
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* need a better way to identify 3.0. -- kjc
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*/
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for (ifa = ifp->if_addrhead.tqh_first; ifa;
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ifa = ifa->ifa_link.tqe_next)
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#elif defined(__FreeBSD__) || defined(__bsdi__)
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for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
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#endif
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if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
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sdl->sdl_family == AF_LINK) {
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sdl->sdl_type = IFT_ATM;
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sdl->sdl_alen = ifp->if_addrlen;
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#ifdef notyet /* if using ATMARP, store hardware address using the next line */
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bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
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#endif
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break;
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}
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#if NBPFILTER > 0
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
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#elif defined(__FreeBSD__)
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bpfattach(ifp, DLT_NULL, sizeof(u_int));
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#endif
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#endif /* NBPFILTER > 0 */
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}
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