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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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/net/if_atmsubr.c 223741 2011-07-03 16:08:38Z bz $");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_natm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/malloc.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 <netinet/in.h>
#include <netinet/if_atm.h>
#include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
#if defined(INET) || defined(INET6)
#include <netinet/in_var.h>
#endif
#ifdef NATM
#include <netnatm/natm.h>
#endif
#include <security/mac/mac_framework.h>
/*
* Netgraph interface functions.
* These need not be protected by a lock, because ng_atm nodes are persitent.
* The ng_atm module can be unloaded only if all ATM interfaces have been
* unloaded, so nobody should be in the code paths accessing these function
* pointers.
*/
void (*ng_atm_attach_p)(struct ifnet *);
void (*ng_atm_detach_p)(struct ifnet *);
int (*ng_atm_output_p)(struct ifnet *, struct mbuf **);
void (*ng_atm_input_p)(struct ifnet *, struct mbuf **,
struct atm_pseudohdr *, void *);
void (*ng_atm_input_orphan_p)(struct ifnet *, struct mbuf *,
struct atm_pseudohdr *, void *);
void (*ng_atm_event_p)(struct ifnet *, uint32_t, void *);
/*
* Harp pseudo interface hooks
*/
void (*atm_harp_input_p)(struct ifnet *ifp, struct mbuf **m,
struct atm_pseudohdr *ah, void *rxhand);
void (*atm_harp_attach_p)(struct ifnet *);
void (*atm_harp_detach_p)(struct ifnet *);
void (*atm_harp_event_p)(struct ifnet *, uint32_t, void *);
SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
MALLOC_DEFINE(M_IFATM, "ifatm", "atm interface internals");
#ifndef ETHERTYPE_IPV6
#define ETHERTYPE_IPV6 0x86dd
#endif
#define senderr(e) do { error = (e); goto bad; } while (0)
/*
* 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)
* "ro" = 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
* ro->ro_rt must also be NULL.
*/
int
atm_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
struct route *ro)
{
u_int16_t etype = 0; /* if using LLC/SNAP */
int error = 0, sz;
struct atm_pseudohdr atmdst, *ad;
struct mbuf *m = m0;
struct atmllc *atmllc;
struct atmllc *llc_hdr = NULL;
u_int32_t atm_flags;
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error)
senderr(error);
#endif
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
senderr(ENETDOWN);
/*
* check for non-native ATM traffic (dst != NULL)
*/
if (dst) {
switch (dst->sa_family) {
#if defined(INET) || defined(INET6)
case AF_INET:
case AF_INET6:
{
if (dst->sa_family == AF_INET6)
etype = ETHERTYPE_IPV6;
else
etype = ETHERTYPE_IP;
if (!atmresolve(ro->ro_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:
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
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));
/* note: in host order */
ATM_LLC_SETTYPE(atmllc, etype);
}
else
bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
}
}
if (ng_atm_output_p != NULL) {
if ((error = (*ng_atm_output_p)(ifp, &m)) != 0) {
if (m != NULL)
m_freem(m);
return (error);
}
if (m == NULL)
return (0);
}
/*
* Queue message on interface, and start output if interface
* not yet active.
*/
if (!IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp,
-(int)sizeof(struct atm_pseudohdr)))
return (ENOBUFS);
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(struct ifnet *ifp, struct atm_pseudohdr *ah, struct mbuf *m,
void *rxhand)
{
int isr;
u_int16_t etype = ETHERTYPE_IP; /* default */
if ((ifp->if_flags & IFF_UP) == 0) {
m_freem(m);
return;
}
#ifdef MAC
mac_ifnet_create_mbuf(ifp, m);
#endif
ifp->if_ibytes += m->m_pkthdr.len;
if (ng_atm_input_p != NULL) {
(*ng_atm_input_p)(ifp, &m, ah, rxhand);
if (m == NULL)
return;
}
/* not eaten by ng_atm. Maybe it's a pseudo-harp PDU? */
if (atm_harp_input_p != NULL) {
(*atm_harp_input_p)(ifp, &m, ah, rxhand);
if (m == NULL)
return;
}
if (rxhand) {
#ifdef NATM
struct natmpcb *npcb;
/*
* XXXRW: this use of 'rxhand' is not a very good idea, and
* was subject to races even before SMPng due to the release
* of spl here.
*/
NATM_LOCK();
npcb = rxhand;
npcb->npcb_inq++; /* count # in queue */
isr = NETISR_NATM;
m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
NATM_UNLOCK();
#else
printf("atm_input: NATM detected but not "
"configured in kernel\n");
goto dropit;
#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)) {
printf("%s: recv'd invalid LLC/SNAP frame "
"[vp=%d,vc=%d]\n", ifp->if_xname,
ATM_PH_VPI(ah), ATM_PH_VCI(ah));
m_freem(m);
return;
}
etype = ATM_LLC_TYPE(alc);
m_adj(m, sizeof(*alc));
}
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
isr = NETISR_IPV6;
break;
#endif
default:
#ifndef NATM
dropit:
#endif
if (ng_atm_input_orphan_p != NULL)
(*ng_atm_input_orphan_p)(ifp, m, ah, rxhand);
else
m_freem(m);
return;
}
}
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(isr, m);
}
/*
* Perform common duties while attaching to interface list.
*/
void
atm_ifattach(struct ifnet *ifp)
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
struct ifatm *ifatm = ifp->if_l2com;
ifp->if_addrlen = 0;
ifp->if_hdrlen = 0;
if_attach(ifp);
ifp->if_mtu = ATMMTU;
ifp->if_output = atm_output;
#if 0
ifp->if_input = atm_input;
#endif
ifp->if_snd.ifq_maxlen = 50; /* dummy */
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
if (ifa->ifa_addr->sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
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;
}
ifp->if_linkmib = &ifatm->mib;
ifp->if_linkmiblen = sizeof(ifatm->mib);
if(ng_atm_attach_p)
(*ng_atm_attach_p)(ifp);
if (atm_harp_attach_p)
(*atm_harp_attach_p)(ifp);
}
/*
* Common stuff for detaching an ATM interface
*/
void
atm_ifdetach(struct ifnet *ifp)
{
if (atm_harp_detach_p)
(*atm_harp_detach_p)(ifp);
if(ng_atm_detach_p)
(*ng_atm_detach_p)(ifp);
if_detach(ifp);
}
/*
* Support routine for the SIOCATMGVCCS ioctl().
*
* This routine assumes, that the private VCC structures used by the driver
* begin with a struct atmio_vcc.
*
* Return a table of VCCs in a freshly allocated memory area.
* Here we have a problem: we first count, how many vccs we need
* to return. The we allocate the memory and finally fill it in.
* Because we cannot lock while calling malloc, the number of active
* vccs may change while we're in malloc. So we allocate a couple of
* vccs more and if space anyway is not enough re-iterate.
*
* We could use an sx lock for the vcc tables.
*/
struct atmio_vcctable *
atm_getvccs(struct atmio_vcc **table, u_int size, u_int start,
struct mtx *lock, int waitok)
{
u_int cid, alloc;
size_t len;
struct atmio_vcctable *vccs;
struct atmio_vcc *v;
alloc = start + 10;
vccs = NULL;
for (;;) {
len = sizeof(*vccs) + alloc * sizeof(vccs->vccs[0]);
vccs = reallocf(vccs, len, M_TEMP,
waitok ? M_WAITOK : M_NOWAIT);
if (vccs == NULL)
return (NULL);
bzero(vccs, len);
vccs->count = 0;
v = vccs->vccs;
mtx_lock(lock);
for (cid = 0; cid < size; cid++)
if (table[cid] != NULL) {
if (++vccs->count == alloc)
/* too many - try again */
break;
*v++ = *table[cid];
}
mtx_unlock(lock);
if (cid == size)
break;
alloc *= 2;
}
return (vccs);
}
/*
* Driver or channel state has changed. Inform whoever is interested
* in these events.
*/
void
atm_event(struct ifnet *ifp, u_int event, void *arg)
{
if (ng_atm_event_p != NULL)
(*ng_atm_event_p)(ifp, event, arg);
if (atm_harp_event_p != NULL)
(*atm_harp_event_p)(ifp, event, arg);
}
static void *
atm_alloc(u_char type, struct ifnet *ifp)
{
struct ifatm *ifatm;
ifatm = malloc(sizeof(struct ifatm), M_IFATM, M_WAITOK | M_ZERO);
ifatm->ifp = ifp;
return (ifatm);
}
static void
atm_free(void *com, u_char type)
{
free(com, M_IFATM);
}
static int
atm_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
if_register_com_alloc(IFT_ATM, atm_alloc, atm_free);
break;
case MOD_UNLOAD:
if_deregister_com_alloc(IFT_ATM);
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t atm_mod = {
"atm",
atm_modevent,
0
};
DECLARE_MODULE(atm, atm_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
MODULE_VERSION(atm, 1);