363 lines
8.8 KiB
C
363 lines
8.8 KiB
C
/* $NetBSD: if_atmsubr.c,v 1.50 2012/10/11 20:05:50 christos Exp $ */
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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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*
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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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_atmsubr.c,v 1.50 2012/10/11 20:05:50 christos Exp $");
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#include "opt_inet.h"
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#include "opt_gateway.h"
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#include "opt_natm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/syslog.h>
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#include <sys/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 <net/ethertypes.h> /* XXX: for ETHERTYPE_* */
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#include <net/bpf.h>
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#include <netinet/in.h>
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#include <netinet/if_atm.h>
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#if defined(INET) || defined(INET6)
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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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#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(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst,
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struct rtentry *rt0)
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{
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uint16_t etype = 0; /* if using LLC/SNAP */
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int error = 0, sz;
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struct atm_pseudohdr atmdst, *ad;
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struct mbuf *m = m0;
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struct rtentry *rt;
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struct atmllc *atmllc;
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uint32_t atm_flags;
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ALTQ_DECL(struct altq_pktattr pktattr;)
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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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/*
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* If the queueing discipline needs packet classification,
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* do it before prepending link headers.
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*/
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IFQ_CLASSIFY(&ifp->if_snd, m,
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(dst != NULL ? dst->sa_family : AF_UNSPEC), &pktattr);
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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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#endif
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#ifdef INET6
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case AF_INET6:
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#endif
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#if defined(INET) || defined(INET6)
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if (dst->sa_family == AF_INET)
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etype = ETHERTYPE_IP;
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else
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etype = ETHERTYPE_IPV6;
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# ifdef ATM_PVCEXT
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if (ifp->if_flags & IFF_POINTOPOINT) {
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/* pvc subinterface */
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struct pvcsif *pvcsif = (struct pvcsif *)ifp;
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atmdst = pvcsif->sif_aph;
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break;
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}
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# endif
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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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break;
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#endif
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case AF_UNSPEC:
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/*
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* XXX: bpfwrite or output from a pvc shadow if.
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* assuming dst contains 12 bytes (atm pseudo
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* header (4) + LLC/SNAP (8))
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*/
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memcpy(&atmdst, dst->sa_data, sizeof(atmdst));
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break;
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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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/*
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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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memcpy(atmllc->llchdr, ATMLLC_HDR,
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sizeof(atmllc->llchdr));
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ATM_LLC_SETTYPE(atmllc, etype);
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}
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}
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return ifq_enqueue(ifp, m ALTQ_COMMA ALTQ_DECL(&pktattr));
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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(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
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void *rxhand)
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{
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struct ifqueue *inq;
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uint16_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_ibytes += m->m_pkthdr.len;
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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 = splnet(); /* 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 (memcmp(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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#ifdef GATEWAY
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if (ipflow_fastforward(m))
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return;
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#endif
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schednetisr(NETISR_IP);
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inq = &ipintrq;
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break;
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#endif /* INET */
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#ifdef INET6
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case ETHERTYPE_IPV6:
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#ifdef GATEWAY
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if (ip6flow_fastforward(&m))
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return;
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#endif
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schednetisr(NETISR_IPV6);
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inq = &ip6intrq;
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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 = splnet();
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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(struct ifnet *ifp)
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{
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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_dlt = DLT_ATM_RFC1483;
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ifp->if_mtu = ATMMTU;
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ifp->if_output = atm_output;
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#if 0 /* XXX XXX XXX */
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ifp->if_input = atm_input;
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#endif
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if_alloc_sadl(ifp);
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/* XXX Store LLADDR for ATMARP. */
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bpf_attach(ifp, DLT_ATM_RFC1483, sizeof(struct atmllc));
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}
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#ifdef ATM_PVCEXT
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static int pvc_max_number = 16; /* max number of PVCs */
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static int pvc_number = 0; /* pvc unit number */
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struct ifnet *
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pvcsif_alloc(void)
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{
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struct pvcsif *pvcsif;
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if (pvc_number >= pvc_max_number)
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return (NULL);
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pvcsif = malloc(sizeof(struct pvcsif),
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M_DEVBUF, M_WAITOK|M_ZERO);
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if (pvcsif == NULL)
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return (NULL);
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#ifdef __NetBSD__
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snprintf(pvcsif->sif_if.if_xname, sizeof(pvcsif->sif_if.if_xname),
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"pvc%d", pvc_number++);
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#else
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pvcsif->sif_if.if_name = "pvc";
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pvcsif->sif_if.if_unit = pvc_number++;
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#endif
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return (&pvcsif->sif_if);
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}
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#endif /* ATM_PVCEXT */
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