427 lines
10 KiB
C
427 lines
10 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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* Copyright (c) 1994 Christos Zoulas
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* Copyright (c) 1997 Todd Vierling
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Stolen from NetBSD /sys/compat/svr4/svr4_net.c. Pseudo-device driver
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* skeleton produced from /usr/share/examples/drivers/make_pseudo_driver.sh
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* in 3.0-980524-SNAP then hacked a bit (but probably not enough :-).
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h> /* SYSINIT stuff */
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#include <sys/conf.h> /* cdevsw stuff */
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#include <sys/malloc.h> /* malloc region definitions */
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/unistd.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/protosw.h>
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#include <sys/socketvar.h>
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#include <sys/un.h>
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#include <sys/domain.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/sysproto.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_util.h>
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#include <compat/svr4/svr4_signal.h>
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#include <compat/svr4/svr4_ioctl.h>
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#include <compat/svr4/svr4_stropts.h>
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#include <compat/svr4/svr4_socket.h>
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static int svr4_soo_close(struct file *, struct thread *);
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static int svr4_ptm_alloc(struct thread *);
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static d_open_t streamsopen;
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struct svr4_sockcache_head svr4_head;
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/* Initialization flag (set/queried by svr4_mod LKM) */
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int svr4_str_initialized = 0;
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/*
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* Device minor numbers
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*/
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enum {
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dev_ptm = 10,
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dev_arp = 26,
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dev_icmp = 27,
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dev_ip = 28,
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dev_tcp = 35,
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dev_udp = 36,
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dev_rawip = 37,
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dev_unix_dgram = 38,
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dev_unix_stream = 39,
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dev_unix_ord_stream = 40
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};
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static struct cdev *dt_ptm, *dt_arp, *dt_icmp, *dt_ip, *dt_tcp, *dt_udp, *dt_rawip,
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*dt_unix_dgram, *dt_unix_stream, *dt_unix_ord_stream;
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static struct fileops svr4_netops = {
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.fo_read = soo_read,
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.fo_write = soo_write,
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.fo_ioctl = soo_ioctl,
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.fo_poll = soo_poll,
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.fo_kqfilter = soo_kqfilter,
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.fo_stat = soo_stat,
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.fo_close = svr4_soo_close
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};
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static struct cdevsw streams_cdevsw = {
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.d_version = D_VERSION,
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.d_flags = D_NEEDGIANT,
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.d_open = streamsopen,
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.d_name = "streams",
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};
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struct streams_softc {
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struct isa_device *dev;
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} ;
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#define UNIT(dev) minor(dev) /* assume one minor number per unit */
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typedef struct streams_softc *sc_p;
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static int
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streams_modevent(module_t mod, int type, void *unused)
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{
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switch (type) {
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case MOD_LOAD:
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/* XXX should make sure it isn't already loaded first */
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dt_ptm = make_dev(&streams_cdevsw, dev_ptm, 0, 0, 0666,
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"ptm");
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dt_arp = make_dev(&streams_cdevsw, dev_arp, 0, 0, 0666,
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"arp");
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dt_icmp = make_dev(&streams_cdevsw, dev_icmp, 0, 0, 0666,
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"icmp");
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dt_ip = make_dev(&streams_cdevsw, dev_ip, 0, 0, 0666,
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"ip");
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dt_tcp = make_dev(&streams_cdevsw, dev_tcp, 0, 0, 0666,
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"tcp");
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dt_udp = make_dev(&streams_cdevsw, dev_udp, 0, 0, 0666,
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"udp");
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dt_rawip = make_dev(&streams_cdevsw, dev_rawip, 0, 0, 0666,
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"rawip");
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dt_unix_dgram = make_dev(&streams_cdevsw, dev_unix_dgram,
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0, 0, 0666, "ticlts");
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dt_unix_stream = make_dev(&streams_cdevsw, dev_unix_stream,
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0, 0, 0666, "ticots");
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dt_unix_ord_stream = make_dev(&streams_cdevsw,
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dev_unix_ord_stream, 0, 0, 0666, "ticotsord");
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if (! (dt_ptm && dt_arp && dt_icmp && dt_ip && dt_tcp &&
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dt_udp && dt_rawip && dt_unix_dgram &&
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dt_unix_stream && dt_unix_ord_stream)) {
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printf("WARNING: device config for STREAMS failed\n");
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printf("Suggest unloading streams KLD\n");
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}
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return 0;
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case MOD_UNLOAD:
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/* XXX should check to see if it's busy first */
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destroy_dev(dt_ptm);
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destroy_dev(dt_arp);
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destroy_dev(dt_icmp);
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destroy_dev(dt_ip);
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destroy_dev(dt_tcp);
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destroy_dev(dt_udp);
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destroy_dev(dt_rawip);
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destroy_dev(dt_unix_dgram);
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destroy_dev(dt_unix_stream);
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destroy_dev(dt_unix_ord_stream);
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return 0;
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default:
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return EOPNOTSUPP;
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break;
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}
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return 0;
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}
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static moduledata_t streams_mod = {
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"streams",
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streams_modevent,
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0
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};
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DECLARE_MODULE(streams, streams_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
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MODULE_VERSION(streams, 1);
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/*
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* We only need open() and close() routines. open() calls socreate()
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* to allocate a "real" object behind the stream and mallocs some state
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* info for use by the svr4 emulator; close() deallocates the state
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* information and passes the underlying object to the normal socket close
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* routine.
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*/
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static int
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streamsopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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int type, protocol;
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int fd, extraref;
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struct file *fp;
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struct socket *so;
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int error;
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int family;
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struct proc *p = td->td_proc;
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PROC_LOCK(p);
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if (td->td_dupfd >= 0) {
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PROC_UNLOCK(p);
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return ENODEV;
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}
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PROC_UNLOCK(p);
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switch (minor(dev)) {
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case dev_udp:
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family = AF_INET;
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type = SOCK_DGRAM;
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protocol = IPPROTO_UDP;
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break;
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case dev_tcp:
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family = AF_INET;
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type = SOCK_STREAM;
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protocol = IPPROTO_TCP;
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break;
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case dev_ip:
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case dev_rawip:
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family = AF_INET;
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type = SOCK_RAW;
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protocol = IPPROTO_IP;
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break;
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case dev_icmp:
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family = AF_INET;
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type = SOCK_RAW;
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protocol = IPPROTO_ICMP;
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break;
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case dev_unix_dgram:
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family = AF_LOCAL;
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type = SOCK_DGRAM;
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protocol = 0;
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break;
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case dev_unix_stream:
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case dev_unix_ord_stream:
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family = AF_LOCAL;
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type = SOCK_STREAM;
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protocol = 0;
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break;
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case dev_ptm:
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return svr4_ptm_alloc(td);
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default:
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return EOPNOTSUPP;
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}
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if ((error = falloc(td, &fp, &fd)) != 0)
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return error;
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/* An extra reference on `fp' has been held for us by falloc(). */
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if ((error = socreate(family, &so, type, protocol,
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td->td_ucred, td)) != 0) {
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FILEDESC_LOCK_FAST(p->p_fd);
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/* Check the fd table entry hasn't changed since we made it. */
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extraref = 0;
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if (p->p_fd->fd_ofiles[fd] == fp) {
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p->p_fd->fd_ofiles[fd] = NULL;
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extraref = 1;
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}
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FILEDESC_UNLOCK_FAST(p->p_fd);
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if (extraref)
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fdrop(fp, td);
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fdrop(fp, td);
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return error;
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}
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FILEDESC_LOCK_FAST(p->p_fd);
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fp->f_data = so;
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fp->f_flag = FREAD|FWRITE;
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fp->f_ops = &svr4_netops;
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fp->f_type = DTYPE_SOCKET;
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FILEDESC_UNLOCK_FAST(p->p_fd);
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(void)svr4_stream_get(fp);
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fdrop(fp, td);
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PROC_LOCK(p);
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td->td_dupfd = fd;
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PROC_UNLOCK(p);
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return ENXIO;
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}
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static int
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svr4_ptm_alloc(td)
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struct thread *td;
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{
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struct proc *p = td->td_proc;
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/*
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* XXX this is very, very ugly. But I can't find a better
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* way that won't duplicate a big amount of code from
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* sys_open(). Ho hum...
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*
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* Fortunately for us, Solaris (at least 2.5.1) makes the
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* /dev/ptmx open automatically just open a pty, that (after
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* STREAMS I_PUSHes), is just a plain pty. fstat() is used
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* to get the minor device number to map to a tty.
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*
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* Cycle through the names. If sys_open() returns ENOENT (or
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* ENXIO), short circuit the cycle and exit.
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*/
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static char ptyname[] = "/dev/ptyXX";
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static char ttyletters[] = "pqrstuwxyzPQRST";
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static char ttynumbers[] = "0123456789abcdef";
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caddr_t sg = stackgap_init();
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char *path = stackgap_alloc(&sg, sizeof(ptyname));
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struct open_args oa;
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int l = 0, n = 0;
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register_t fd = -1;
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int error;
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oa.path = path;
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oa.flags = O_RDWR;
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oa.mode = 0;
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while (fd == -1) {
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ptyname[8] = ttyletters[l];
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ptyname[9] = ttynumbers[n];
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if ((error = copyout(ptyname, path, sizeof(ptyname))) != 0)
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return error;
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switch (error = open(td, &oa)) {
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case ENOENT:
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case ENXIO:
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return error;
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case 0:
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PROC_LOCK(p);
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td->td_dupfd = td->td_retval[0];
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PROC_UNLOCK(p);
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return ENXIO;
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default:
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if (ttynumbers[++n] == '\0') {
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if (ttyletters[++l] == '\0')
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break;
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n = 0;
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}
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}
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}
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return ENOENT;
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}
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struct svr4_strm *
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svr4_stream_get(fp)
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struct file *fp;
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{
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struct socket *so;
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struct svr4_strm *st;
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if (fp == NULL || fp->f_type != DTYPE_SOCKET)
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return NULL;
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so = fp->f_data;
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/*
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* mpfixme: lock socketbuffer here
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*/
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if (so->so_emuldata) {
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return so->so_emuldata;
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}
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/* Allocate a new one. */
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st = malloc(sizeof(struct svr4_strm), M_TEMP, M_WAITOK);
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st->s_family = so->so_proto->pr_domain->dom_family;
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st->s_cmd = ~0;
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st->s_afd = -1;
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st->s_eventmask = 0;
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/*
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* avoid a race where we loose due to concurrancy issues
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* of two threads trying to allocate the so_emuldata.
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*/
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if (so->so_emuldata) {
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/* lost the race, use the existing emuldata */
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FREE(st, M_TEMP);
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st = so->so_emuldata;
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} else {
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/* we won, or there was no race, use our copy */
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so->so_emuldata = st;
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fp->f_ops = &svr4_netops;
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}
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return st;
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}
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void
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svr4_delete_socket(p, fp)
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struct proc *p;
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struct file *fp;
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{
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struct svr4_sockcache_entry *e;
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void *cookie = ((struct socket *)fp->f_data)->so_emuldata;
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while (svr4_str_initialized != 2) {
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if (atomic_cmpset_acq_int(&svr4_str_initialized, 0, 1)) {
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TAILQ_INIT(&svr4_head);
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atomic_store_rel_int(&svr4_str_initialized, 2);
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}
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return;
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}
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TAILQ_FOREACH(e, &svr4_head, entries)
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if (e->p == p && e->cookie == cookie) {
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TAILQ_REMOVE(&svr4_head, e, entries);
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DPRINTF(("svr4_delete_socket: %s [%p,%d,%d]\n",
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e->sock.sun_path, p, (int)e->dev, e->ino));
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free(e, M_TEMP);
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return;
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}
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}
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static int
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svr4_soo_close(struct file *fp, struct thread *td)
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{
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struct socket *so = fp->f_data;
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/* CHECKUNIT_DIAG(ENXIO);*/
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svr4_delete_socket(td->td_proc, fp);
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free(so->so_emuldata, M_TEMP);
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return soo_close(fp, td);
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}
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