FreeBSD-5.3/sys/dev/streams/streams.c
/*
* 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: src/sys/dev/streams/streams.c,v 1.47 2004/07/15 08:26:03 phk Exp $");
#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/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>
static int svr4_soo_close(struct file *, struct thread *);
static int svr4_ptm_alloc(struct thread *);
static d_open_t streamsopen;
struct svr4_sockcache_head svr4_head;
/* Initialization flag (set/queried by svr4_mod LKM) */
int svr4_str_initialized = 0;
/*
* 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 = {
.fo_read = soo_read,
.fo_write = soo_write,
.fo_ioctl = soo_ioctl,
.fo_poll = soo_poll,
.fo_kqfilter = soo_kqfilter,
.fo_stat = soo_stat,
.fo_close = svr4_soo_close
};
static struct cdevsw streams_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = streamsopen,
.d_name = "streams",
};
struct streams_softc {
struct isa_device *dev;
} ;
#define UNIT(dev) minor(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:
/* XXX should make sure it isn't already loaded first */
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");
}
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);
/*
* 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)
{
int type, protocol;
int fd, extraref;
struct file *fp;
struct socket *so;
int error;
int family;
struct proc *p = td->td_proc;
PROC_LOCK(p);
if (td->td_dupfd >= 0) {
PROC_UNLOCK(p);
return ENODEV;
}
PROC_UNLOCK(p);
switch (minor(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)
return error;
/* An extra reference on `fp' has been held for us by falloc(). */
if ((error = socreate(family, &so, type, protocol,
td->td_ucred, td)) != 0) {
FILEDESC_LOCK(p->p_fd);
/* Check the fd table entry hasn't changed since we made it. */
extraref = 0;
if (p->p_fd->fd_ofiles[fd] == fp) {
p->p_fd->fd_ofiles[fd] = NULL;
extraref = 1;
}
FILEDESC_UNLOCK(p->p_fd);
if (extraref)
fdrop(fp, td);
fdrop(fp, td);
return error;
}
FILEDESC_LOCK(p->p_fd);
fp->f_data = so;
fp->f_flag = FREAD|FWRITE;
fp->f_ops = &svr4_netops;
fp->f_type = DTYPE_SOCKET;
FILEDESC_UNLOCK(p->p_fd);
(void)svr4_stream_get(fp);
fdrop(fp, td);
PROC_LOCK(p);
td->td_dupfd = fd;
PROC_UNLOCK(p);
return ENXIO;
}
static int
svr4_ptm_alloc(td)
struct thread *td;
{
struct proc *p = td->td_proc;
/*
* 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.
*/
static char ptyname[] = "/dev/ptyXX";
static char ttyletters[] = "pqrstuwxyzPQRST";
static char ttynumbers[] = "0123456789abcdef";
caddr_t sg = stackgap_init();
char *path = stackgap_alloc(&sg, sizeof(ptyname));
struct open_args oa;
int l = 0, n = 0;
register_t fd = -1;
int error;
oa.path = path;
oa.flags = O_RDWR;
oa.mode = 0;
while (fd == -1) {
ptyname[8] = ttyletters[l];
ptyname[9] = ttynumbers[n];
if ((error = copyout(ptyname, path, sizeof(ptyname))) != 0)
return error;
switch (error = open(td, &oa)) {
case ENOENT:
case ENXIO:
return error;
case 0:
PROC_LOCK(p);
td->td_dupfd = td->td_retval[0];
PROC_UNLOCK(p);
return ENXIO;
default:
if (ttynumbers[++n] == '\0') {
if (ttyletters[++l] == '\0')
break;
n = 0;
}
}
}
return ENOENT;
}
struct svr4_strm *
svr4_stream_get(fp)
struct file *fp;
{
struct socket *so;
struct svr4_strm *st;
if (fp == NULL || fp->f_type != DTYPE_SOCKET)
return NULL;
so = fp->f_data;
/*
* mpfixme: lock socketbuffer here
*/
if (so->so_emuldata) {
return so->so_emuldata;
}
/* Allocate a new one. */
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;
/*
* avoid a race where we loose due to concurrancy issues
* of two threads trying to allocate the so_emuldata.
*/
if (so->so_emuldata) {
/* lost the race, use the existing emuldata */
FREE(st, M_TEMP);
st = so->so_emuldata;
} else {
/* we won, or there was no race, use our copy */
so->so_emuldata = st;
fp->f_ops = &svr4_netops;
}
return st;
}
void
svr4_delete_socket(p, fp)
struct proc *p;
struct file *fp;
{
struct svr4_sockcache_entry *e;
void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
while (svr4_str_initialized != 2) {
if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
TAILQ_INIT(&svr4_head);
atomic_store_rel_int(&svr4_str_initialized, 2);
}
return;
}
TAILQ_FOREACH(e, &svr4_head, entries)
if (e->p == p && e->cookie == cookie) {
TAILQ_REMOVE(&svr4_head, e, entries);
DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
e->sock.sun_path, p, (int)e->dev, e->ino));
free(e, M_TEMP);
return;
}
}
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);
return soo_close(fp, td);
}