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52c008534d
freebsd-dev/sys/netnatm/natm.c
Robert Watson a152f8a361 Change semantics of socket close and detach. Add a new protocol switch 
function, pru_close, to notify protocols that the file descriptor or
other consumer of a socket is closing the socket.  pru_abort is now a
notification of close also, and no longer detaches.  pru_detach is no
longer used to notify of close, and will be called during socket
tear-down by sofree() when all references to a socket evaporate after
an earlier call to abort or close the socket.  This means detach is now
an unconditional teardown of a socket, whereas previously sockets could
persist after detach of the protocol retained a reference.

This faciliates sharing mutexes between layers of the network stack as
the mutex is required during the checking and removal of references at
the head of sofree().  With this change, pru_detach can now assume that
the mutex will no longer be required by the socket layer after
completion, whereas before this was not necessarily true.

Reviewed by:	gnn
2006-07-21 17:11:15 +00:00

463 lines
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/* $NetBSD: natm.c,v 1.5 1996/11/09 03:26:26 chuck Exp $ */
/*-
*
* Copyright (c) 1996 Charles D. Cranor and Washington University.
* Copyright (c) 2005-2006 Robert N. M. Watson
* 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.
*/
/*
* natm.c: Native mode ATM access (both aal0 and aal5).
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sx.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_atm.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netnatm/natm.h>
static const u_long natm5_sendspace = 16*1024;
static const u_long natm5_recvspace = 16*1024;
static const u_long natm0_sendspace = 16*1024;
static const u_long natm0_recvspace = 16*1024;
/*
* netnatm global subsystem lock, protects all global data structures in
* netnatm.
*/
struct mtx natm_mtx;
/*
* User socket requests.
*/
static int natm_usr_attach(struct socket *, int, d_thread_t *);
static void natm_usr_detach(struct socket *);
static int natm_usr_connect(struct socket *, struct sockaddr *,
d_thread_t *);
static int natm_usr_disconnect(struct socket *);
static int natm_usr_shutdown(struct socket *);
static int natm_usr_send(struct socket *, int, struct mbuf *,
struct sockaddr *, struct mbuf *, d_thread_t *);
static int natm_usr_peeraddr(struct socket *, struct sockaddr **);
static int natm_usr_control(struct socket *, u_long, caddr_t,
struct ifnet *, d_thread_t *);
static void natm_usr_abort(struct socket *);
static int natm_usr_bind(struct socket *, struct sockaddr *,
d_thread_t *);
static int natm_usr_sockaddr(struct socket *, struct sockaddr **);
static int
natm_usr_attach(struct socket *so, int proto, d_thread_t *p)
{
struct natmpcb *npcb;
int error = 0;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb == NULL, ("natm_usr_attach: so_pcb != NULL"));
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
if (proto == PROTO_NATMAAL5)
error = soreserve(so, natm5_sendspace,
natm5_recvspace);
else
error = soreserve(so, natm0_sendspace,
natm0_recvspace);
if (error)
return (error);
}
so->so_pcb = npcb = npcb_alloc(M_WAITOK);
npcb->npcb_socket = so;
return (error);
}
static void
natm_usr_detach(struct socket *so)
{
struct natmpcb *npcb;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_detach: npcb == NULL"));
NATM_LOCK();
npcb_free(npcb, NPCB_DESTROY); /* drain */
so->so_pcb = NULL;
NATM_UNLOCK();
}
static int
natm_usr_connect(struct socket *so, struct sockaddr *nam, d_thread_t *p)
{
struct natmpcb *npcb;
struct sockaddr_natm *snatm;
struct atmio_openvcc op;
struct ifnet *ifp;
int error = 0;
int proto = so->so_proto->pr_protocol;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_connect: npcb == NULL"));
/*
* Validate nam and npcb.
*/
NATM_LOCK();
snatm = (struct sockaddr_natm *)nam;
if (snatm->snatm_len != sizeof(*snatm) ||
(npcb->npcb_flags & NPCB_FREE) == 0) {
NATM_UNLOCK();
return (EINVAL);
}
if (snatm->snatm_family != AF_NATM) {
NATM_UNLOCK();
return (EAFNOSUPPORT);
}
snatm->snatm_if[IFNAMSIZ - 1] = '\0'; /* XXX ensure null termination
since ifunit() uses strcmp */
/*
* Convert interface string to ifp, validate.
*/
ifp = ifunit(snatm->snatm_if);
if (ifp == NULL || (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
NATM_UNLOCK();
return (ENXIO);
}
if (ifp->if_output != atm_output) {
NATM_UNLOCK();
return (EAFNOSUPPORT);
}
/*
* Register us with the NATM PCB layer.
*/
if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) {
NATM_UNLOCK();
return (EADDRINUSE);
}
/*
* Open the channel.
*
* XXXRW: Eventually desirable to hold mutex over ioctl?
*/
bzero(&op, sizeof(op));
op.rxhand = npcb;
op.param.flags = ATMIO_FLAG_PVC;
op.param.vpi = npcb->npcb_vpi;
op.param.vci = npcb->npcb_vci;
op.param.rmtu = op.param.tmtu = ifp->if_mtu;
op.param.aal = (proto == PROTO_NATMAAL5) ? ATMIO_AAL_5 : ATMIO_AAL_0;
op.param.traffic = ATMIO_TRAFFIC_UBR;
NATM_UNLOCK();
IFF_LOCKGIANT(ifp);
if (ifp->if_ioctl == NULL ||
ifp->if_ioctl(ifp, SIOCATMOPENVCC, (caddr_t)&op) != 0) {
IFF_UNLOCKGIANT(ifp);
return (EIO);
}
IFF_UNLOCKGIANT(ifp);
soisconnected(so);
return (error);
}
static int
natm_usr_disconnect(struct socket *so)
{
struct natmpcb *npcb;
struct atmio_closevcc cl;
struct ifnet *ifp;
int error = 0;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_disconnect: npcb == NULL"));
NATM_LOCK();
if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) {
NATM_UNLOCK();
printf("natm: disconnected check\n");
return (EIO);
}
ifp = npcb->npcb_ifp;
/*
* Disable rx.
*
* XXXRW: Eventually desirable to hold mutex over ioctl?
*/
cl.vpi = npcb->npcb_vpi;
cl.vci = npcb->npcb_vci;
NATM_UNLOCK();
if (ifp->if_ioctl != NULL) {
IFF_LOCKGIANT(ifp);
ifp->if_ioctl(ifp, SIOCATMCLOSEVCC, (caddr_t)&cl);
IFF_UNLOCKGIANT(ifp);
}
soisdisconnected(so);
return (error);
}
static int
natm_usr_shutdown(struct socket *so)
{
socantsendmore(so);
return (0);
}
static int
natm_usr_send(struct socket *so, int flags, struct mbuf *m,
struct sockaddr *nam, struct mbuf *control, d_thread_t *p)
{
struct natmpcb *npcb;
struct atm_pseudohdr *aph;
int error = 0;
int proto = so->so_proto->pr_protocol;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_send: npcb == NULL"));
NATM_LOCK();
if (control && control->m_len) {
NATM_UNLOCK();
m_freem(control);
m_freem(m);
return (EINVAL);
}
/*
* Send the data. We must put an atm_pseudohdr on first.
*/
M_PREPEND(m, sizeof(*aph), M_DONTWAIT);
if (m == NULL) {
NATM_UNLOCK();
m_freem(control);
return (ENOBUFS);
}
aph = mtod(m, struct atm_pseudohdr *);
ATM_PH_VPI(aph) = npcb->npcb_vpi;
ATM_PH_SETVCI(aph, npcb->npcb_vci);
ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
error = atm_output(npcb->npcb_ifp, m, NULL, NULL);
NATM_UNLOCK();
return (error);
}
static int
natm_usr_peeraddr(struct socket *so, struct sockaddr **nam)
{
struct natmpcb *npcb;
struct sockaddr_natm *snatm, ssnatm;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_peeraddr: npcb == NULL"));
NATM_LOCK();
snatm = &ssnatm;
bzero(snatm, sizeof(*snatm));
snatm->snatm_len = sizeof(*snatm);
snatm->snatm_family = AF_NATM;
strlcpy(snatm->snatm_if, npcb->npcb_ifp->if_xname,
sizeof(snatm->snatm_if));
snatm->snatm_vci = npcb->npcb_vci;
snatm->snatm_vpi = npcb->npcb_vpi;
NATM_UNLOCK();
*nam = sodupsockaddr((struct sockaddr *)snatm, M_WAITOK);
return (0);
}
static int
natm_usr_control(struct socket *so, u_long cmd, caddr_t arg,
struct ifnet *ifp, d_thread_t *p)
{
struct natmpcb *npcb;
int error;
npcb = (struct natmpcb *)so->so_pcb;
KASSERT(npcb != NULL, ("natm_usr_control: npcb == NULL"));
if (ifp == NULL || ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
IFF_LOCKGIANT(ifp);
error = ((*ifp->if_ioctl)(ifp, cmd, arg));
IFF_UNLOCKGIANT(ifp);
return (error);
}
static void
natm_usr_abort(struct socket *so)
{
}
static void
natm_usr_close(struct socket *so)
{
}
static int
natm_usr_bind(struct socket *so, struct sockaddr *nam, d_thread_t *p)
{
return (EOPNOTSUPP);
}
static int
natm_usr_sockaddr(struct socket *so, struct sockaddr **nam)
{
return (EOPNOTSUPP);
}
/* xxx - should be const */
struct pr_usrreqs natm_usrreqs = {
.pru_abort = natm_usr_abort,
.pru_attach = natm_usr_attach,
.pru_bind = natm_usr_bind,
.pru_connect = natm_usr_connect,
.pru_control = natm_usr_control,
.pru_detach = natm_usr_detach,
.pru_disconnect = natm_usr_disconnect,
.pru_peeraddr = natm_usr_peeraddr,
.pru_send = natm_usr_send,
.pru_shutdown = natm_usr_shutdown,
.pru_sockaddr = natm_usr_sockaddr,
.pru_close = natm_usr_close,
};
/*
* natmintr: interrupt
*
* Note: we expect a socket pointer in rcvif rather than an interface
* pointer. We can get the interface pointer from the so's PCB if we really
* need it.
*/
void
natmintr(struct mbuf *m)
{
struct socket *so;
struct natmpcb *npcb;
#ifdef DIAGNOSTIC
M_ASSERTPKTHDR(m);
#endif
NATM_LOCK();
npcb = (struct natmpcb *)m->m_pkthdr.rcvif; /* XXX: overloaded */
so = npcb->npcb_socket;
npcb->npcb_inq--;
if (npcb->npcb_flags & NPCB_DRAIN) {
if (npcb->npcb_inq == 0)
FREE(npcb, M_PCB); /* done! */
NATM_UNLOCK();
m_freem(m);
return;
}
if (npcb->npcb_flags & NPCB_FREE) {
NATM_UNLOCK();
m_freem(m); /* drop */
return;
}
#ifdef NEED_TO_RESTORE_IFP
m->m_pkthdr.rcvif = npcb->npcb_ifp;
#else
#ifdef DIAGNOSTIC
m->m_pkthdr.rcvif = NULL; /* null it out to be safe */
#endif
#endif
if (sbspace(&so->so_rcv) > m->m_pkthdr.len) {
#ifdef NATM_STAT
natm_sookcnt++;
natm_sookbytes += m->m_pkthdr.len;
#endif
sbappendrecord(&so->so_rcv, m);
sorwakeup(so);
NATM_UNLOCK();
} else {
#ifdef NATM_STAT
natm_sodropcnt++;
natm_sodropbytes += m->m_pkthdr.len;
#endif
NATM_UNLOCK();
m_freem(m);
}
}
/*
* natm0_sysctl: not used, but here in case we want to add something
* later...
*/
int
natm0_sysctl(SYSCTL_HANDLER_ARGS)
{
/* All sysctl names at this level are terminal. */
return (ENOENT);
}
/*
* natm5_sysctl: not used, but here in case we want to add something
* later...
*/
int
natm5_sysctl(SYSCTL_HANDLER_ARGS)
{
/* All sysctl names at this level are terminal. */
return (ENOENT);
}
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