freebsd-dev/sys/net/if_atmsubr.c

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1997-05-09 07:48:14 +00:00
/* $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck 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_natm.h"
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/errno.h>
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#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 <netinet/in.h>
#include <netinet/if_atm.h>
#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
#if defined(INET) || defined(INET6)
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#include <netinet/in_var.h>
#endif
#ifdef NATM
#include <netnatm/natm.h>
#endif
#ifndef ETHERTYPE_IPV6
#define ETHERTYPE_IPV6 0x86dd
#endif
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#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)
register 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;
struct atm_pseudohdr atmdst, *ad;
register struct mbuf *m = m0;
register struct rtentry *rt;
struct atmllc *atmllc;
struct atmllc *llc_hdr = NULL;
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u_int32_t atm_flags;
if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
/*
* 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) {
#if defined(INET) || defined(INET6)
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case AF_INET:
case AF_INET6:
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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 */
}
if (dst->sa_family == AF_INET6)
etype = htons(ETHERTYPE_IPV6);
else
etype = htons(ETHERTYPE_IP);
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break;
#endif /* INET || INET6 */
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;
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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);
if (llc_hdr == NULL) {
bcopy(ATMLLC_HDR, atmllc->llchdr,
sizeof(atmllc->llchdr));
ATM_LLC_SETTYPE(atmllc, etype);
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/* note: already in network order */
}
else
bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
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}
}
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
s = splimp();
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
splx(s);
senderr(ENOBUFS);
}
ifp->if_obytes += m->m_pkthdr.len;
IF_ENQUEUE(&ifp->if_snd, m);
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;
register struct atm_pseudohdr *ah;
struct mbuf *m;
void *rxhand;
{
register 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;
#ifdef ATM_PVCEXT
if (ATM_PH_FLAGS(ah) & ATM_PH_PVCSIF) {
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/*
* when PVC shadow interface is used, pointer to
* the shadow interface is passed as rxhand.
* override the receive interface of the packet.
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*/
m->m_pkthdr.rcvif = (struct ifnet *)rxhand;
rxhand = NULL;
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}
#endif /* ATM_PVCEXT */
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if (rxhand) {
#ifdef NATM
struct natmpcb *npcb = rxhand;
s = splimp(); /* 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 */
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#else
printf("atm_input: NATM detected but not configured in kernel\n");
m_freem(m);
return;
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#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)) {
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#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));
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#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));
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#endif
m_freem(m);
return;
}
etype = ATM_LLC_TYPE(alc);
m_adj(m, sizeof(*alc));
}
switch (etype) {
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#ifdef INET
case ETHERTYPE_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
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#endif
default:
m_freem(m);
return;
}
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}
s = splimp();
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)
register struct ifnet *ifp;
{
register struct ifaddr *ifa;
register struct sockaddr_dl *sdl;
ifp->if_type = IFT_ATM;
ifp->if_addrlen = 0;
ifp->if_hdrlen = 0;
ifp->if_mtu = ATMMTU;
ifp->if_output = atm_output;
#if defined(__NetBSD__) || defined(__OpenBSD__)
for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
ifa = ifa->ifa_list.tqe_next)
#elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
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for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next)
#elif defined(__FreeBSD__) || defined(__bsdi__)
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
#endif
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ATM;
sdl->sdl_alen = ifp->if_addrlen;
#ifdef notyet /* if using ATMARP, store hardware address using the next line */
bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
#endif
break;
}
}
#ifdef ATM_PVCEXT
/*
* ATM PVC shadow interface: a trick to assign a shadow interface
* to a PVC.
* with shadow interface, each PVC looks like an individual
* Point-to-Point interface.
* as oposed to the NBMA model, a shadow interface is inherently
* multicast capable (no LANE/MARS required).
*/
struct pvcsif {
struct ifnet sif_shadow; /* shadow ifnet structure per pvc */
struct atm_pseudohdr sif_aph; /* flags + vpi:vci */
struct ifnet *sif_ifp; /* pointer to the genuine interface */
};
static int pvc_output __P((struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *));
static int pvc_ioctl __P((struct ifnet *, u_long, caddr_t));
/*
* create and attach per pvc shadow interface
* (currently detach is not supported)
*/
static int pvc_number = 0;
struct ifnet *
pvc_attach(ifp)
struct ifnet *ifp;
{
struct pvcsif *pvcsif;
struct ifnet *shadow;
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
int s;
MALLOC(pvcsif, struct pvcsif *, sizeof(struct pvcsif),
M_DEVBUF, M_WAITOK);
bzero(pvcsif, sizeof(struct pvcsif));
pvcsif->sif_ifp = ifp;
shadow = &pvcsif->sif_shadow;
shadow->if_name = "pvc";
shadow->if_unit = pvc_number++;
shadow->if_flags = ifp->if_flags | (IFF_POINTOPOINT | IFF_MULTICAST);
shadow->if_ioctl = pvc_ioctl;
shadow->if_output = pvc_output;
shadow->if_start = NULL;
shadow->if_mtu = ifp->if_mtu;
shadow->if_type = ifp->if_type;
shadow->if_addrlen = ifp->if_addrlen;
shadow->if_hdrlen = ifp->if_hdrlen;
shadow->if_softc = pvcsif;
shadow->if_snd.ifq_maxlen = 50; /* dummy */
s = splimp();
if_attach(shadow);
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#if defined(__NetBSD__) || defined(__OpenBSD__)
for (ifa = shadow->if_addrlist.tqh_first; ifa != 0;
ifa = ifa->ifa_list.tqe_next)
#elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
for (ifa = shadow->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next)
#elif defined(__FreeBSD__) || defined(__bsdi__)
for (ifa = shadow->if_addrlist; ifa; ifa = ifa->ifa_next)
#endif
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ATM;
sdl->sdl_alen = shadow->if_addrlen;
break;
}
splx(s);
return (shadow);
}
/*
* pvc_output relays the packet to atm_output along with vpi:vci info.
*/
static int
pvc_output(shadow, m, dst, rt)
struct ifnet *shadow;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt;
{
struct pvcsif *pvcsif;
struct sockaddr dst_addr;
struct atmllc *atmllc;
u_int16_t etype = 0;
int error = 0;
if ((shadow->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
senderr(ENETDOWN);
pvcsif = shadow->if_softc;
if (ATM_PH_VCI(&pvcsif->sif_aph) == 0)
senderr(ENETDOWN);
/*
* create a dummy sockaddr: (using bpfwrite interface)
* put atm pseudo header and llc/snap into sa_data (12 bytes)
* and mark it as AF_UNSPEC.
*/
if (dst) {
switch (dst->sa_family) {
#if defined(INET) || defined(INET6)
case AF_INET:
case AF_INET6:
if (dst->sa_family == AF_INET6)
etype = htons(ETHERTYPE_IPV6);
else
etype = htons(ETHERTYPE_IP);
break;
#endif
default:
printf("%s%d: can't handle af%d\n", shadow->if_name,
shadow->if_unit, dst->sa_family);
senderr(EAFNOSUPPORT);
}
}
dst_addr.sa_family = AF_UNSPEC;
bcopy(&pvcsif->sif_aph, dst_addr.sa_data,
sizeof(struct atm_pseudohdr));
atmllc = (struct atmllc *)
(dst_addr.sa_data + sizeof(struct atm_pseudohdr));
bcopy(ATMLLC_HDR, atmllc->llchdr, sizeof(atmllc->llchdr));
ATM_LLC_SETTYPE(atmllc, etype); /* note: already in network order */
return atm_output(pvcsif->sif_ifp, m, &dst_addr, rt);
bad:
if (m)
m_freem(m);
return (error);
}
static int
pvc_ioctl(shadow, cmd, data)
struct ifnet *shadow;
u_long cmd;
caddr_t data;
{
struct ifnet *ifp;
struct pvcsif *pvcsif;
struct ifreq *ifr = (struct ifreq *) data;
void (*ifa_rtrequest)(int, struct rtentry *, struct sockaddr *) = NULL;
int error = 0;
pvcsif = (struct pvcsif *)shadow->if_softc;
ifp = pvcsif->sif_ifp;
if (ifp == 0 || ifp->if_ioctl == 0)
return (EOPNOTSUPP);
/*
* pre process
*/
switch (cmd) {
case SIOCGPVCSIF:
snprintf(ifr->ifr_name, sizeof(ifr->ifr_name),
"%s%d", ifp->if_name, ifp->if_unit);
return (0);
case SIOCGPVCTX:
do {
struct pvctxreq *pvcreq = (struct pvctxreq *)data;
snprintf(pvcreq->pvc_ifname,
sizeof(pvcreq->pvc_ifname), "%s%d",
ifp->if_name, ifp->if_unit);
pvcreq->pvc_aph = pvcsif->sif_aph;
} while (0);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0)
return (EAFNOSUPPORT); /* XXX */
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
return (0);
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#endif
#ifdef INET6
case AF_INET6:
return (0);
#endif
default:
return (EAFNOSUPPORT);
}
break;
case SIOCSIFADDR:
if (ifp->if_flags & IFF_UP) {
/* real if is already up */
shadow->if_flags = ifp->if_flags |
(IFF_POINTOPOINT|IFF_MULTICAST);
return (0);
}
/*
* XXX: save the rtrequest field since the atm driver
* overwrites this field.
*/
ifa_rtrequest = ((struct ifaddr *)data)->ifa_rtrequest;
break;
case SIOCSIFFLAGS:
if ((shadow->if_flags & IFF_UP) == 0) {
/*
* interface down. don't pass this to
* the real interface.
*/
return (0);
}
if (shadow->if_flags & IFF_UP) {
/*
* interface up. if the real if is already up,
* nothing to do.
*/
if (ifp->if_flags & IFF_UP) {
shadow->if_flags = ifp->if_flags |
(IFF_POINTOPOINT|IFF_MULTICAST);
return (0);
}
}
break;
}
/*
* pass the ioctl to the genuine interface
*/
error = (*ifp->if_ioctl)(ifp, cmd, data);
/*
* post process
*/
switch (cmd) {
case SIOCSIFMTU:
shadow->if_mtu = ifp->if_mtu;
break;
case SIOCSIFADDR:
/* restore rtrequest */
((struct ifaddr *)data)->ifa_rtrequest = ifa_rtrequest;
/* fall into... */
case SIOCSIFFLAGS:
/* update if_flags */
shadow->if_flags = ifp->if_flags
| (IFF_POINTOPOINT|IFF_MULTICAST);
break;
}
return (error);
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}
int pvc_setaph(shadow, aph)
struct ifnet *shadow;
struct atm_pseudohdr *aph;
{
struct pvcsif *pvcsif;
pvcsif = shadow->if_softc;
bcopy(aph, &pvcsif->sif_aph, sizeof(struct atm_pseudohdr));
return (0);
}
#endif /* ATM_PVCEXT */