New pseudo-device to provide for a way of obtaining a socket by open()ing
something in /dev. Obtained from: Christos Zoulas, with FreeBSD modifications
This commit is contained in:
Mark Newton
parent
f8b03d857e
commit
888ac52b62
427
sys/dev/streams/streams.c
Normal file
427
sys/dev/streams/streams.c
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@ -0,0 +1,427 @@
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/*
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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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#include "streams.h" /* generated file.. defines NSTREAMS */
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#include "opt_devfs.h"
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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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#ifdef DEVFS
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#include <sys/devfsext.h> /* DEVFS defintitions */
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#endif /* DEVFS */
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#include <sys/sysproto.h>
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#include <svr4/svr4_types.h>
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#include <svr4/svr4_util.h>
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#include <svr4/svr4_signal.h>
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#include <svr4/svr4_ioctl.h>
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#include <svr4/svr4_stropts.h>
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#include <svr4/svr4_socket.h>
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static int svr4_soo_close __P((struct file *, struct proc *));
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static int svr4_ptm_alloc __P((struct proc *));
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static d_open_t streamsopen;
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struct svr4_sockcache_entry {
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struct proc *p; /* Process for the socket */
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void *cookie; /* Internal cookie used for matching */
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struct sockaddr_un sock;/* Pathname for the socket */
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dev_t dev; /* Device where the socket lives on */
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ino_t ino; /* Inode where the socket lives on */
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TAILQ_ENTRY(svr4_sockcache_entry) entries;
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};
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TAILQ_HEAD(svr4_sockcache_head, svr4_sockcache_entry) 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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int soo_read __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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int soo_write __P((struct file *fp, struct uio *uio,
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struct ucred *cred));
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int soo_close __P((struct file *fp, struct proc *p));
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static struct fileops svr4_netops = {
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soo_read, soo_write, soo_ioctl, soo_poll, svr4_soo_close
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};
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#define CDEV_MAJOR 103
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static struct cdevsw streams_cdevsw = {
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streamsopen,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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"streams",
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NULL,
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-1 };
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struct streams_softc {
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struct isa_device *dev;
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#ifdef DEVFS
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/*
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* If this ever becomes an LKM we'll want this crud so we can deallocate
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* devfs entries when the module is unloaded
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*/
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void *devfs_ptm;
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void *devfs_arp;
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void *devfs_icmp;
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void *devfs_ip;
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void *devfs_tcp;
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void *devfs_udp;
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void *devfs_rawip;
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void *devfs_unix_dgram;
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void *devfs_unix_stream;
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void *devfs_unix_ord_stream;
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#endif
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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 sc_p sca[NSTREAMS];
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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(dev_t dev, int oflags, int devtype, struct proc *p)
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{
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int type, protocol;
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int fd;
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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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if (p->p_dupfd >= 0)
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return ENODEV;
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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(p);
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default:
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return EOPNOTSUPP;
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}
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if ((error = falloc(p, &fp, &fd)) != 0)
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return error;
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if ((error = socreate(family, &so, type, protocol, p)) != 0) {
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p->p_fd->fd_ofiles[fd] = 0;
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ffree(fp);
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return error;
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}
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fp->f_flag = FREAD|FWRITE;
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fp->f_type = DTYPE_SOCKET;
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fp->f_ops = &svr4_netops;
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fp->f_data = (caddr_t)so;
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(void)svr4_stream_get(fp);
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p->p_dupfd = fd;
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return ENXIO;
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}
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static int
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svr4_ptm_alloc(p)
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struct proc *p;
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{
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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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SCARG(&oa, path) = path;
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SCARG(&oa, flags) = O_RDWR;
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SCARG(&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(p, &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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p->p_dupfd = p->p_retval[0];
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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 = (struct socket *) fp->f_data;
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if (so->so_emuldata)
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return so->so_emuldata;
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/* Allocate a new one. */
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fp->f_ops = &svr4_netops;
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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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so->so_emuldata = st;
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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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if (!svr4_str_initialized) {
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TAILQ_INIT(&svr4_head);
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svr4_str_initialized = 1;
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return;
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}
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for (e = svr4_head.tqh_first; e != NULL; e = e->entries.tqe_next)
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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, 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 proc *p)
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{
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struct socket *so = (struct socket *)fp->f_data;
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/* CHECKUNIT_DIAG(ENXIO);*/
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svr4_delete_socket(p, fp);
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free(so->so_emuldata, M_TEMP);
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return soo_close(fp, p);
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return (0);
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}
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/*
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* Now for some driver initialisation.
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* Occurs ONCE during boot (very early).
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*/
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static void
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streams_drvinit(void *unused)
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{
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dev_t dev;
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int unit;
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sc_p scp = sca[unit];
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dev = makedev(CDEV_MAJOR, 0);
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cdevsw_add(&dev, &streams_cdevsw, NULL);
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for (unit = 0; unit < NSTREAMS; unit++) {
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/*
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* Allocate storage for this instance .
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*/
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scp = malloc(sizeof(*scp), M_DEVBUF, M_NOWAIT);
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if( scp == NULL) {
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printf("streams%d failed to allocate strorage\n", unit);
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return ;
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}
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bzero(scp, sizeof(*scp));
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sca[unit] = scp;
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#if DEVFS
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/* XXX - This stuff is all completely bogus -- It's supposed
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* to show up in /compat/svr4/dev, but devfs will be mounted
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* on /dev, won't it? Sigh. CHECKALTEXIST() will mean
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* device opens will still work (and it will mitigate the
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* need to run SVR4_MAKEDEV in /compat/svr4/dev, or will
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* replace it with a script which creates symlinks to entities
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* in /dev, or something equally 'orrible), but it's
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* still a botch to put emulator-specific devices in the
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* "global" part of the filesystem tree (especially scumsucking
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* devices like these). Good thing hardly anyone uses
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* devfs, right?
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*/
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scp->devfs_ptm = devfs_add_devswf(&streams_cdevsw, dev_ptm, DV_CHR,
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UID_ROOT, GID_KMEM, 0640, "ptmx", unit);
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scp->devfs_arp = devfs_add_devswf(&streams_cdevsw, dev_arp, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "arp", unit);
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scp->devfs_icmp = devfs_add_devswf(&streams_cdevsw, dev_icmp, DV_CHR,
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UID_ROOT, GID_KMEM, 0600, "icmp", unit);
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scp->devfs_ip = devfs_add_devswf(&streams_cdevsw, dev_ip, DV_CHR,
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UID_ROOT, GID_KMEM, 0600, "ip", unit);
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scp->devfs_tcp = devfs_add_devswf(&streams_cdevsw, dev_tcp, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "tcp", unit);
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scp->devfs_udp = devfs_add_devswf(&streams_cdevsw, dev_udp, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "udp", unit);
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scp->devfs_rawip = devfs_add_devswf(&streams_cdevsw, dev_rawip, DV_CHR,
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UID_ROOT, GID_KMEM, 0600, "rawip", unit);
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scp->devfs_unix_dgram = devfs_add_devswf(&streams_cdevsw, dev_unix_dgram, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "ticlts", unit);
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scp->devfs_unix_stream = devfs_add_devswf(&streams_cdevsw, dev_unix_stream, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "ticots", unit);
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scp->devfs_unix_ord_stream = devfs_add_devswf(&streams_cdevsw, dev_unix_ord_stream, DV_CHR,
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UID_ROOT, GID_KMEM, 0666, "ticotsord", unit);
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#endif
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}
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}
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SYSINIT(streamsdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE+CDEV_MAJOR,
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streams_drvinit, NULL)
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