freebsd-dev/sys/dev/streams/streams.c

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/*-
* Copyright (c) 1998 Mark Newton
* Copyright (c) 1994 Christos Zoulas
* Copyright (c) 1997 Todd Vierling
* 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. The names of the authors 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.
*
* Stolen from NetBSD /sys/compat/svr4/svr4_net.c. Pseudo-device driver
* skeleton produced from /usr/share/examples/drivers/make_pseudo_driver.sh
* in 3.0-980524-SNAP then hacked a bit (but probably not enough :-).
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h> /* SYSINIT stuff */
#include <sys/conf.h> /* cdevsw stuff */
#include <sys/malloc.h> /* malloc region definitions */
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/unistd.h>
#include <sys/fcntl.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/syscallsubr.h>
#include <sys/un.h>
#include <sys/domain.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/sysproto.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_ioctl.h>
#include <compat/svr4/svr4_stropts.h>
#include <compat/svr4/svr4_socket.h>
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static int svr4_soo_close(struct file *, struct thread *);
static int svr4_ptm_alloc(struct thread *);
static d_open_t streamsopen;
/*
* Device minor numbers
*/
enum {
dev_ptm = 10,
dev_arp = 26,
dev_icmp = 27,
dev_ip = 28,
dev_tcp = 35,
dev_udp = 36,
dev_rawip = 37,
dev_unix_dgram = 38,
dev_unix_stream = 39,
dev_unix_ord_stream = 40
};
static struct cdev *dt_ptm, *dt_arp, *dt_icmp, *dt_ip, *dt_tcp, *dt_udp,
*dt_rawip, *dt_unix_dgram, *dt_unix_stream, *dt_unix_ord_stream;
static struct fileops svr4_netops;
static struct cdevsw streams_cdevsw = {
.d_version = D_VERSION,
.d_open = streamsopen,
.d_name = "streams",
};
struct streams_softc {
struct isa_device *dev;
} ;
#define UNIT(dev) dev2unit(dev) /* assume one minor number per unit */
typedef struct streams_softc *sc_p;
static int
streams_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
"ptm");
dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
"arp");
dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
"icmp");
dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
"ip");
dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
"tcp");
dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
"udp");
dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
"rawip");
dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
0, 0, 0666, "ticlts");
dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
0, 0, 0666, "ticots");
dt_unix_ord_stream = make_dev(&streams_cdevsw,
dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
dt_udp && dt_rawip && dt_unix_dgram &&
dt_unix_stream && dt_unix_ord_stream)) {
printf("WARNING: device config for STREAMS failed\n");
printf("Suggest unloading streams KLD\n");
}
/* Inherit generic socket file operations, except close(2). */
bcopy(&socketops, &svr4_netops, sizeof(struct fileops));
svr4_netops.fo_close = svr4_soo_close;
return 0;
case MOD_UNLOAD:
/* XXX should check to see if it's busy first */
destroy_dev(dt_ptm);
destroy_dev(dt_arp);
destroy_dev(dt_icmp);
destroy_dev(dt_ip);
destroy_dev(dt_tcp);
destroy_dev(dt_udp);
destroy_dev(dt_rawip);
destroy_dev(dt_unix_dgram);
destroy_dev(dt_unix_stream);
destroy_dev(dt_unix_ord_stream);
return 0;
default:
return EOPNOTSUPP;
break;
}
return 0;
}
static moduledata_t streams_mod = {
"streams",
streams_modevent,
0
};
DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
MODULE_VERSION(streams, 1);
MODULE_DEPEND(streams, svr4elf, 1, 1, 1);
/*
* We only need open() and close() routines. open() calls socreate()
* to allocate a "real" object behind the stream and mallocs some state
* info for use by the svr4 emulator; close() deallocates the state
* information and passes the underlying object to the normal socket close
* routine.
*/
static int
streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
Clean up the svr4 socket cache and streams code some to make it more easily locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
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struct svr4_strm *st;
struct socket *so;
Clean up the svr4 socket cache and streams code some to make it more easily locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
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struct file *fp;
int family, type, protocol;
int error, fd;
if (td->td_dupfd >= 0)
return ENODEV;
switch (dev2unit(dev)) {
case dev_udp:
family = AF_INET;
type = SOCK_DGRAM;
protocol = IPPROTO_UDP;
break;
case dev_tcp:
family = AF_INET;
type = SOCK_STREAM;
protocol = IPPROTO_TCP;
break;
case dev_ip:
case dev_rawip:
family = AF_INET;
type = SOCK_RAW;
protocol = IPPROTO_IP;
break;
case dev_icmp:
family = AF_INET;
type = SOCK_RAW;
protocol = IPPROTO_ICMP;
break;
case dev_unix_dgram:
family = AF_LOCAL;
type = SOCK_DGRAM;
protocol = 0;
break;
case dev_unix_stream:
case dev_unix_ord_stream:
family = AF_LOCAL;
type = SOCK_STREAM;
protocol = 0;
break;
case dev_ptm:
return svr4_ptm_alloc(td);
default:
return EOPNOTSUPP;
}
if ((error = falloc(td, &fp, &fd, 0)) != 0)
return error;
/* An extra reference on `fp' has been held for us by falloc(). */
Clean up the svr4 socket cache and streams code some to make it more easily locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
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error = socreate(family, &so, type, protocol, td->td_ucred, td);
if (error) {
fdclose(td, fp, fd);
Clean up the svr4 socket cache and streams code some to make it more easily locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
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fdrop(fp, td);
return error;
}
finit(fp, FREAD | FWRITE, DTYPE_SOCKET, so, &svr4_netops);
Clean up the svr4 socket cache and streams code some to make it more easily locked. - Move all the svr4 socket cache code into svr4_socket.c, specifically move svr4_delete_socket() over from streams.c. Make the socket cache entry structure and svr4_head private to svr4_socket.c as a result. - Add a mutex to protect the svr4 socket cache. - Change svr4_find_socket() to copy the sockaddr_un struct into a caller-supplied sockaddr_un rather than giving the caller a pointer to our internal one. This removes the one case where code outside of svr4_socket.c could access data in the cache. - Add an eventhandler for process_exit and process_exec to purge the cache of any entries for the exiting or execing process. - Add methods to init and destroy the socket cache and call them from the svr4 ABI module's event handler. - Conditionally grab Giant around socreate() in streamsopen(). - Use fdclose() instead of inlining it in streamsopen() when handling socreate() failure. - Only allocate a stream structure and attach it to a socket in streamsopen(). Previously, if a svr4 program performed a stream operation on an arbitrary socket not opened via the streams device, we would attach streams state data to it and change f_ops of the associated struct file while it was in use. The latter was especially not safe, and if a program wants a stream object it should open it via the streams device anyway. - Don't bother locking so_emuldata in the streams code now that we only touch it right after creating a socket (in streamsopen()) or when tearing it down when the file is closed. - Remove D_NEEDGIANT from the streams device as it is no longer needed.
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/*
* Allocate a stream structure and attach it to this socket.
* We don't bother locking so_emuldata for SVR4 stream sockets as
* its value is constant for the lifetime of the stream once it
* is initialized here.
*/
st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
st->s_family = so->so_proto->pr_domain->dom_family;
st->s_cmd = ~0;
st->s_afd = -1;
st->s_eventmask = 0;
so->so_emuldata = st;
fdrop(fp, td);
td->td_dupfd = fd;
return ENXIO;
}
static int
svr4_ptm_alloc(td)
struct thread *td;
{
/*
* XXX this is very, very ugly. But I can't find a better
* way that won't duplicate a big amount of code from
* sys_open(). Ho hum...
*
* Fortunately for us, Solaris (at least 2.5.1) makes the
* /dev/ptmx open automatically just open a pty, that (after
* STREAMS I_PUSHes), is just a plain pty. fstat() is used
* to get the minor device number to map to a tty.
*
* Cycle through the names. If sys_open() returns ENOENT (or
* ENXIO), short circuit the cycle and exit.
*
* XXX: Maybe this can now be implemented by posix_openpt()?
*/
static char ptyname[] = "/dev/ptyXX";
static char ttyletters[] = "pqrstuwxyzPQRST";
static char ttynumbers[] = "0123456789abcdef";
struct proc *p;
register_t fd;
int error, l, n;
fd = -1;
n = 0;
l = 0;
p = td->td_proc;
while (fd == -1) {
ptyname[8] = ttyletters[l];
ptyname[9] = ttynumbers[n];
error = kern_openat(td, AT_FDCWD, ptyname, UIO_SYSSPACE,
O_RDWR, 0);
switch (error) {
case ENOENT:
case ENXIO:
return error;
case 0:
td->td_dupfd = td->td_retval[0];
return ENXIO;
default:
if (ttynumbers[++n] == '\0') {
if (ttyletters[++l] == '\0')
break;
n = 0;
}
}
}
return ENOENT;
}
static int
svr4_soo_close(struct file *fp, struct thread *td)
{
struct socket *so = fp->f_data;
/* CHECKUNIT_DIAG(ENXIO);*/
svr4_delete_socket(td->td_proc, fp);
free(so->so_emuldata, M_TEMP);
fp->f_ops = &badfileops;
fp->f_data = NULL;
return soclose(so);
}