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NetBSD/sys/net/if_atmsubr.c

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/* $NetBSD: if_atmsubr.c,v 1.30 2001/07/18 16:43:09 thorpej Exp $ */
/*
*
* Copyright (c) 1996 Charles D. Cranor and Washington University.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* if_atmsubr.c
*/
#include "opt_inet.h"
#include "opt_gateway.h"
#include "opt_natm.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_atm.h>
#include <net/ethertypes.h> /* XXX: for ETHERTYPE_* */
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netinet/in.h>
#include <netinet/if_atm.h>
#if defined(INET) || defined(INET6)
#include <netinet/in_var.h>
#endif
#ifdef NATM
#include <netnatm/natm.h>
#endif
#define senderr(e) { error = (e); goto bad;}
/*
* atm_output: ATM output routine
* inputs:
* "ifp" = ATM interface to output to
* "m0" = the packet to output
* "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
* "rt0" = the route to use
* returns: error code [0 == ok]
*
* note: special semantic: if (dst == NULL) then we assume "m" already
* has an atm_pseudohdr on it and just send it directly.
* [for native mode ATM output] if dst is null, then
* rt0 must also be NULL.
*/
int
atm_output(ifp, m0, dst, rt0)
struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt0;
{
u_int16_t etype = 0; /* if using LLC/SNAP */
int s, error = 0, sz, len;
struct atm_pseudohdr atmdst, *ad;
struct mbuf *m = m0;
struct rtentry *rt;
struct atmllc *atmllc;
struct atmllc *llc_hdr = NULL;
u_int32_t atm_flags;
ALTQ_DECL(struct altq_pktattr pktattr;)
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
/*
* If the queueing discipline needs packet classification,
* do it before prepending link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m,
(dst != NULL ? dst->sa_family : AF_UNSPEC), &pktattr);
/*
* check route
*/
if ((rt = rt0) != NULL) {
if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
rt->rt_refcnt--;
else
senderr(EHOSTUNREACH);
}
if (rt->rt_flags & RTF_GATEWAY) {
if (rt->rt_gwroute == 0)
goto lookup;
if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
rtfree(rt); rt = rt0;
lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
if ((rt = rt->rt_gwroute) == 0)
senderr(EHOSTUNREACH);
}
}
/* XXX: put RTF_REJECT code here if doing ATMARP */
}
/*
* check for non-native ATM traffic (dst != NULL)
*/
if (dst) {
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
#endif
#ifdef INET6
case AF_INET6:
#endif
#if defined(INET) || defined(INET6)
if (dst->sa_family == AF_INET)
etype = ETHERTYPE_IP;
else
etype = ETHERTYPE_IPV6;
# ifdef ATM_PVCEXT
if (ifp->if_flags & IFF_POINTOPOINT) {
/* pvc subinterface */
struct pvcsif *pvcsif = (struct pvcsif *)ifp;
atmdst = pvcsif->sif_aph;
break;
}
# endif
if (!atmresolve(rt, m, dst, &atmdst)) {
m = NULL;
/* XXX: atmresolve already free'd it */
senderr(EHOSTUNREACH);
/* XXX: put ATMARP stuff here */
/* XXX: watch who frees m on failure */
}
break;
#endif
case AF_UNSPEC:
/*
* XXX: bpfwrite or output from a pvc shadow if.
* assuming dst contains 12 bytes (atm pseudo
* header (4) + LLC/SNAP (8))
*/
bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
break;
default:
#if defined(__NetBSD__) || defined(__OpenBSD__)
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
#elif defined(__FreeBSD__) || defined(__bsdi__)
printf("%s%d: can't handle af%d\n", ifp->if_name,
ifp->if_unit, dst->sa_family);
#endif
senderr(EAFNOSUPPORT);
}
/*
* must add atm_pseudohdr to data
*/
sz = sizeof(atmdst);
atm_flags = ATM_PH_FLAGS(&atmdst);
if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
M_PREPEND(m, sz, M_DONTWAIT);
if (m == 0)
senderr(ENOBUFS);
ad = mtod(m, struct atm_pseudohdr *);
*ad = atmdst;
if (atm_flags & ATM_PH_LLCSNAP) {
atmllc = (struct atmllc *)(ad + 1);
bcopy(ATMLLC_HDR, atmllc->llchdr,
sizeof(atmllc->llchdr));
ATM_LLC_SETTYPE(atmllc, etype);
}
}
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
len = m->m_pkthdr.len;
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
if (error) {
splx(s);
return (error);
}
ifp->if_obytes += len;
if ((ifp->if_flags & IFF_OACTIVE) == 0)
(*ifp->if_start)(ifp);
splx(s);
return (error);
bad:
if (m)
m_freem(m);
return (error);
}
/*
* Process a received ATM packet;
* the packet is in the mbuf chain m.
*/
void
atm_input(ifp, ah, m, rxhand)
struct ifnet *ifp;
struct atm_pseudohdr *ah;
struct mbuf *m;
void *rxhand;
{
struct ifqueue *inq;
u_int16_t etype = ETHERTYPE_IP; /* default */
int s;
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
ifp->if_ibytes += m->m_pkthdr.len;
if (rxhand) {
#ifdef NATM
struct natmpcb *npcb = rxhand;
s = splnet(); /* in case 2 atm cards @ diff lvls */
npcb->npcb_inq++; /* count # in queue */
splx(s);
schednetisr(NETISR_NATM);
inq = &natmintrq;
m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
#else
printf("atm_input: NATM detected but not configured in kernel\n");
m_freem(m);
return;
#endif
} else {
/*
* handle LLC/SNAP header, if present
*/
if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
struct atmllc *alc;
if (m->m_len < sizeof(*alc) && (m = m_pullup(m, sizeof(*alc))) == 0)
return; /* failed */
alc = mtod(m, struct atmllc *);
if (bcmp(alc, ATMLLC_HDR, 6)) {
#if defined(__NetBSD__) || defined(__OpenBSD__)
printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
#elif defined(__FreeBSD__) || defined(__bsdi__)
printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
#endif
m_freem(m);
return;
}
etype = ATM_LLC_TYPE(alc);
m_adj(m, sizeof(*alc));
}
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
#ifdef GATEWAY
if (ipflow_fastforward(m))
return;
#endif
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif /* INET */
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
default:
m_freem(m);
return;
}
}
s = splnet();
if (IF_QFULL(inq)) {
IF_DROP(inq);
m_freem(m);
} else
IF_ENQUEUE(inq, m);
splx(s);
}
/*
* Perform common duties while attaching to interface list
*/
void
atm_ifattach(ifp)
struct ifnet *ifp;
{
ifp->if_type = IFT_ATM;
ifp->if_addrlen = 0;
ifp->if_hdrlen = 0;
ifp->if_dlt = DLT_ATM_RFC1483;
ifp->if_mtu = ATMMTU;
ifp->if_output = atm_output;
#if 0 /* XXX XXX XXX */
ifp->if_input = atm_input;
#endif
if_alloc_sadl(ifp);
/* XXX Store LLADDR for ATMARP. */
#if NBPFILTER > 0
bpfattach(ifp, DLT_ATM_RFC1483, sizeof(struct atmllc));
#endif
}
#ifdef ATM_PVCEXT
static int pvc_max_number = 16; /* max number of PVCs */
static int pvc_number = 0; /* pvc unit number */
struct ifnet *
pvcsif_alloc()
{
struct pvcsif *pvcsif;
if (pvc_number >= pvc_max_number)
return (NULL);
MALLOC(pvcsif, struct pvcsif *, sizeof(struct pvcsif),
M_DEVBUF, M_WAITOK);
if (pvcsif == NULL)
return (NULL);
memset(pvcsif, 0, sizeof(struct pvcsif));
#ifdef __NetBSD__
sprintf(pvcsif->sif_if.if_xname, "pvc%d", pvc_number++);
#else
pvcsif->sif_if.if_name = "pvc";
pvcsif->sif_if.if_unit = pvc_number++;
#endif
return (&pvcsif->sif_if);
}
#endif /* ATM_PVCEXT */
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