/*
* linux/fs/9p/trans_socket.c
*
* Socket Transport Layer
*
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
* Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to:
* Free Software Foundation
* 51 Franklin Street, Fifth Floor
* Boston, MA 02111-1301 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/net.h>
#include <linux/ipv6.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/un.h>
#include <asm/uaccess.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include "debug.h"
#include "v9fs.h"
#include "transport.h"
#define V9FS_PORT 564
struct v9fs_trans_sock {
struct socket *s;
};
/**
* v9fs_sock_recv - receive from a socket
* @v9ses: session information
* @v: buffer to receive data into
* @len: size of receive buffer
*
*/
static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
{
struct msghdr msg;
struct kvec iov;
int result;
mm_segment_t oldfs;
struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
if (trans->status == Disconnected)
return -EREMOTEIO;
result = -EINVAL;
oldfs = get_fs();
set_fs(get_ds());
iov.iov_base = v;
iov.iov_len = len;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
msg.msg_flags = MSG_NOSIGNAL;
result = kernel_recvmsg(ts->s, &msg, &iov, 1, len, 0);
dprintk(DEBUG_TRANS, "socket state %d\n", ts->s->state);
set_fs(oldfs);
if (result <= 0) {
if (result != -ERESTARTSYS)
trans->status = Disconnected;
}
return result;
}
/**
* v9fs_sock_send - send to a socket
* @v9ses: session information
* @v: buffer to send data from
* @len: size of send buffer
*
*/
static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
{
struct kvec iov;
struct msghdr msg;
int result = -1;
mm_segment_t oldfs;
struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
dprintk(DEBUG_TRANS, "Sending packet size %d (%x)\n", len, len);
dump_data(v, len);
down(&trans->writelock);
oldfs = get_fs();
set_fs(get_ds());
iov.iov_base = v;
iov.iov_len = len;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
msg.msg_flags = MSG_NOSIGNAL;
result = kernel_sendmsg(ts->s, &msg, &iov, 1, len);
set_fs(oldfs);
if (result < 0) {
if (result != -ERESTARTSYS)
trans->status = Disconnected;
}
up(&trans->writelock);
return result;
}
/**
* v9fs_tcp_init - initialize TCP socket
* @v9ses: session information
* @addr: address of server to mount
* @data: mount options
*
*/
static int
v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
{
struct socket *csocket = NULL;
struct sockaddr_in sin_server;
int rc = 0;
struct v9fs_trans_sock *ts = NULL;
struct v9fs_transport *trans = v9ses->transport;
sema_init(&trans->writelock, 1);
sema_init(&trans->readlock, 1);
ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
if (!ts)
return -ENOMEM;
trans->priv = ts;
ts->s = NULL;
if (!addr)
return -EINVAL;
dprintk(DEBUG_TRANS, "Connecting to %s\n", addr);
sin_server.sin_family = AF_INET;
sin_server.sin_addr.s_addr = in_aton(addr);
sin_server.sin_port = htons(v9ses->port);
sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
rc = csocket->ops->connect(csocket,
(struct sockaddr *)&sin_server,
sizeof(struct sockaddr_in), 0);
if (rc < 0) {
eprintk(KERN_ERR,
"v9fs_trans_tcp: problem connecting socket to %s\n",
addr);
return rc;
}
csocket->sk->sk_allocation = GFP_NOIO;
ts->s = csocket;
trans->status = Connected;
return 0;
}
/**
* v9fs_unix_init - initialize UNIX domain socket
* @v9ses: session information
* @dev_name: path to named pipe
* @data: mount options
*
*/
static int
v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
char *data)
{
int rc;
struct socket *csocket;
struct sockaddr_un sun_server;
struct v9fs_transport *trans;
struct v9fs_trans_sock *ts;
rc = 0;
csocket = NULL;
trans = v9ses->transport;
if (strlen(dev_name) > UNIX_PATH_MAX) {
eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
dev_name);
return -ENOMEM;
}
ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
if (!ts)
return -ENOMEM;
trans->priv = ts;
ts->s = NULL;
sema_init(&trans->writelock, 1);
sema_init(&trans->readlock, 1);
sun_server.sun_family = PF_UNIX;
strcpy(sun_server.sun_path, dev_name);
sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */
if (rc < 0) {
eprintk(KERN_ERR,
"v9fs_trans_unix: problem connecting socket: %s: %d\n",
dev_name, rc);
return rc;
}
csocket->sk->sk_allocation = GFP_NOIO;
ts->s = csocket;
trans->status = Connected;
return 0;
}
/**
* v9fs_sock_close - shutdown socket
* @trans: private socket structure
*
*/
static void v9fs_sock_close(struct v9fs_transport *trans)
{
struct v9fs_trans_sock *ts;
if (!trans)
return;
ts = trans->priv;
if ((ts) && (ts->s)) {
dprintk(DEBUG_TRANS, "closing the socket %p\n", ts->s);
sock_release(ts->s);
ts->s = NULL;
trans->status = Disconnected;
dprintk(DEBUG_TRANS, "socket closed\n");
}
kfree(ts);
trans->priv = NULL;
}
struct v9fs_transport v9fs_trans_tcp = {
.init = v9fs_tcp_init,
.write = v9fs_sock_send,
.read = v9fs_sock_recv,
.close = v9fs_sock_close,
};
struct v9fs_transport v9fs_trans_unix = {
.init = v9fs_unix_init,
.write = v9fs_sock_send,
.read = v9fs_sock_recv,
.close = v9fs_sock_close,
};
