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/* $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_inet6.h"
#include "opt_natm.h"

#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>

#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/ethernet.h>

#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)
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, len;
struct atm_pseudohdr atmdst, *ad;
register struct mbuf *m = m0;
register 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) {
#if defined(INET) || defined(INET6)
#ifdef INET
case AF_INET:
#endif
#ifdef INET6
case AF_INET6:
#endif
if (dst->sa_family == AF_INET6)
etype = htons(ETHERTYPE_IPV6);
else
etype = htons(ETHERTYPE_IP);
#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 /* INET || INET6 */

case AF_UNSPEC:
/*
* XXX: bpfwrite. 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);
if (llc_hdr == NULL) {
bcopy(ATMLLC_HDR, atmllc->llchdr,
sizeof(atmllc->llchdr));
ATM_LLC_SETTYPE(atmllc, etype);
/* note: already in network order */
}
else
bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
}
}

/*
* Queue message on interface, and start output if interface
* not yet active.
*/
len = m->m_pkthdr.len;
s = splimp();
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;
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;

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 */
#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));
}

#ifdef ATM_PVCEXT
/* atm bridging support */
if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LINK2)) ==
(IFF_POINTOPOINT|IFF_LINK2)) {
struct pvcsif *pvcsif = (struct pvcsif *)ifp;

if (pvcsif->sif_fwdifp != NULL) {
struct sockaddr dst;

/* set address family to dummy dst addr */
switch (etype) {
case ETHERTYPE_IP:
dst.sa_family = AF_INET;
break;
case ETHERTYPE_IPV6:
dst.sa_family = AF_INET6;
break;
default:
m_freem(m);
return;
}
atm_output(pvcsif->sif_fwdifp, m, &dst, NULL);
return;
}
}
#endif /* ATM_PVCEXT */

switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
schednetisr(NETISR_IP);
inq = &ipintrq;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
schednetisr(NETISR_IPV6);
inq = &ip6intrq;
break;
#endif
default:
m_freem(m);
return;
}
}

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;
IFQ_SET_MAXLEN(&ifp->if_snd, 50); /* dummy */

#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)
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

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);
bzero(pvcsif, 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);
}

/*
* pvc bridging support:
* add or delete brigding between 2 pvc interfaces.
*/
int
pvc_set_fwd(if_name, if_name2, op)
char *if_name, *if_name2;
int op; /* 0:delete 1:add 2:get */
{
struct ifnet *ifp, *ifp2;
struct pvcsif *pvcsif, *pvcsif2;

if (strncmp(if_name, "pvc", 3) != 0
|| (ifp = ifunit(if_name)) == NULL)
return (EINVAL);
pvcsif = (struct pvcsif *)ifp;

if (op == 2) {
/* get bridging info */
if ((ifp2 = pvcsif->sif_fwdifp) == NULL)
*if_name2 = '\0';
else
#ifdef __NetBSD__
sprintf(if_name2, "%s", ifp2->if_xname);
#else
sprintf(if_name2, "%s%d",
ifp2->if_name, ifp2->if_unit);
#endif
return (0);
}

if (strncmp(if_name2, "pvc", 3) != 0
|| (ifp2 = ifunit(if_name2)) == NULL)
return (EINVAL);
pvcsif2 = (struct pvcsif *)ifp2;

if (op) {
/* set up bridging */
pvcsif->sif_fwdifp = ifp2;
pvcsif2->sif_fwdifp = ifp;
ifp->if_flags |= IFF_LINK2; /* use IFF_LINK2 to show */
ifp2->if_flags |= IFF_LINK2; /* bridging is enabled */
}
else {
/* delete bridging */
if (pvcsif->sif_fwdifp != ifp2 || pvcsif2->sif_fwdifp != ifp)
return (EINVAL);
pvcsif->sif_fwdifp = NULL;
pvcsif2->sif_fwdifp = NULL;
ifp->if_flags &= ~IFF_LINK2;
ifp2->if_flags &= ~IFF_LINK2;
}
return (0);
}
#endif /* ATM_PVCEXT */
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