Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/trans_socket.c |
| 3 | * |
| 4 | * Socket Transport Layer |
| 5 | * |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 6 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 7 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 8 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
| 9 | * Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to: |
| 23 | * Free Software Foundation |
| 24 | * 51 Franklin Street, Fifth Floor |
| 25 | * Boston, MA 02111-1301 USA |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #include <linux/config.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 30 | #include <linux/in.h> |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 31 | #include <linux/module.h> |
| 32 | #include <linux/net.h> |
| 33 | #include <linux/ipv6.h> |
| 34 | #include <linux/errno.h> |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/un.h> |
| 37 | #include <asm/uaccess.h> |
| 38 | #include <linux/inet.h> |
| 39 | #include <linux/idr.h> |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 40 | #include <linux/file.h> |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 41 | |
| 42 | #include "debug.h" |
| 43 | #include "v9fs.h" |
| 44 | #include "transport.h" |
| 45 | |
| 46 | #define V9FS_PORT 564 |
| 47 | |
| 48 | struct v9fs_trans_sock { |
| 49 | struct socket *s; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 50 | struct file *filp; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 51 | }; |
| 52 | |
| 53 | /** |
| 54 | * v9fs_sock_recv - receive from a socket |
| 55 | * @v9ses: session information |
| 56 | * @v: buffer to receive data into |
| 57 | * @len: size of receive buffer |
| 58 | * |
| 59 | */ |
| 60 | |
| 61 | static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len) |
| 62 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 63 | int ret; |
| 64 | struct v9fs_trans_sock *ts; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 65 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 66 | if (!trans || trans->status == Disconnected) { |
| 67 | dprintk(DEBUG_ERROR, "disconnected ...\n"); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 68 | return -EREMOTEIO; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 69 | } |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 70 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 71 | ts = trans->priv; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 72 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 73 | if (!(ts->filp->f_flags & O_NONBLOCK)) |
| 74 | dprintk(DEBUG_ERROR, "blocking read ...\n"); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 75 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 76 | ret = kernel_read(ts->filp, ts->filp->f_pos, v, len); |
| 77 | if (ret <= 0) { |
| 78 | if (ret != -ERESTARTSYS && ret != -EAGAIN) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 79 | trans->status = Disconnected; |
| 80 | } |
| 81 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 82 | return ret; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | /** |
| 86 | * v9fs_sock_send - send to a socket |
| 87 | * @v9ses: session information |
| 88 | * @v: buffer to send data from |
| 89 | * @len: size of send buffer |
| 90 | * |
| 91 | */ |
| 92 | |
| 93 | static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len) |
| 94 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 95 | int ret; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 96 | mm_segment_t oldfs; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 97 | struct v9fs_trans_sock *ts; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 98 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 99 | if (!trans || trans->status == Disconnected) { |
| 100 | dprintk(DEBUG_ERROR, "disconnected ...\n"); |
| 101 | return -EREMOTEIO; |
| 102 | } |
| 103 | |
| 104 | ts = trans->priv; |
| 105 | if (!ts) { |
| 106 | dprintk(DEBUG_ERROR, "no transport ...\n"); |
| 107 | return -EREMOTEIO; |
| 108 | } |
| 109 | |
| 110 | if (!(ts->filp->f_flags & O_NONBLOCK)) |
| 111 | dprintk(DEBUG_ERROR, "blocking write ...\n"); |
| 112 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 113 | oldfs = get_fs(); |
| 114 | set_fs(get_ds()); |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 115 | ret = vfs_write(ts->filp, (void __user *)v, len, &ts->filp->f_pos); |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 116 | set_fs(oldfs); |
| 117 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 118 | if (ret < 0) { |
| 119 | if (ret != -ERESTARTSYS) |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 120 | trans->status = Disconnected; |
| 121 | } |
| 122 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 123 | return ret; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 124 | } |
| 125 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 126 | static unsigned int v9fs_sock_poll(struct v9fs_transport *trans, |
| 127 | struct poll_table_struct *pt) { |
| 128 | |
| 129 | int ret; |
| 130 | struct v9fs_trans_sock *ts; |
| 131 | mm_segment_t oldfs; |
| 132 | |
| 133 | if (!trans) { |
| 134 | dprintk(DEBUG_ERROR, "no transport\n"); |
| 135 | return -EIO; |
| 136 | } |
| 137 | |
| 138 | ts = trans->priv; |
| 139 | if (trans->status != Connected || !ts) { |
| 140 | dprintk(DEBUG_ERROR, "transport disconnected: %d\n", trans->status); |
| 141 | return -EIO; |
| 142 | } |
| 143 | |
| 144 | oldfs = get_fs(); |
| 145 | set_fs(get_ds()); |
| 146 | |
| 147 | if (!ts->filp->f_op || !ts->filp->f_op->poll) { |
| 148 | dprintk(DEBUG_ERROR, "no poll operation\n"); |
| 149 | ret = -EIO; |
| 150 | goto end; |
| 151 | } |
| 152 | |
| 153 | ret = ts->filp->f_op->poll(ts->filp, pt); |
| 154 | |
| 155 | end: |
| 156 | set_fs(oldfs); |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 161 | /** |
| 162 | * v9fs_tcp_init - initialize TCP socket |
| 163 | * @v9ses: session information |
| 164 | * @addr: address of server to mount |
| 165 | * @data: mount options |
| 166 | * |
| 167 | */ |
| 168 | |
| 169 | static int |
| 170 | v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data) |
| 171 | { |
| 172 | struct socket *csocket = NULL; |
| 173 | struct sockaddr_in sin_server; |
| 174 | int rc = 0; |
| 175 | struct v9fs_trans_sock *ts = NULL; |
| 176 | struct v9fs_transport *trans = v9ses->transport; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 177 | int fd; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 178 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 179 | trans->status = Disconnected; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 180 | |
| 181 | ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL); |
| 182 | |
| 183 | if (!ts) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | trans->priv = ts; |
| 187 | ts->s = NULL; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 188 | ts->filp = NULL; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 189 | |
| 190 | if (!addr) |
| 191 | return -EINVAL; |
| 192 | |
| 193 | dprintk(DEBUG_TRANS, "Connecting to %s\n", addr); |
| 194 | |
| 195 | sin_server.sin_family = AF_INET; |
| 196 | sin_server.sin_addr.s_addr = in_aton(addr); |
| 197 | sin_server.sin_port = htons(v9ses->port); |
| 198 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); |
| 199 | rc = csocket->ops->connect(csocket, |
| 200 | (struct sockaddr *)&sin_server, |
| 201 | sizeof(struct sockaddr_in), 0); |
| 202 | if (rc < 0) { |
| 203 | eprintk(KERN_ERR, |
| 204 | "v9fs_trans_tcp: problem connecting socket to %s\n", |
| 205 | addr); |
| 206 | return rc; |
| 207 | } |
| 208 | csocket->sk->sk_allocation = GFP_NOIO; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 209 | |
| 210 | fd = sock_map_fd(csocket); |
| 211 | if (fd < 0) { |
| 212 | sock_release(csocket); |
| 213 | kfree(ts); |
| 214 | trans->priv = NULL; |
| 215 | return fd; |
| 216 | } |
| 217 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 218 | ts->s = csocket; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 219 | ts->filp = fget(fd); |
| 220 | ts->filp->f_flags |= O_NONBLOCK; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 221 | trans->status = Connected; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * v9fs_unix_init - initialize UNIX domain socket |
| 228 | * @v9ses: session information |
| 229 | * @dev_name: path to named pipe |
| 230 | * @data: mount options |
| 231 | * |
| 232 | */ |
| 233 | |
| 234 | static int |
| 235 | v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name, |
| 236 | char *data) |
| 237 | { |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 238 | int rc, fd; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 239 | struct socket *csocket; |
| 240 | struct sockaddr_un sun_server; |
| 241 | struct v9fs_transport *trans; |
| 242 | struct v9fs_trans_sock *ts; |
| 243 | |
| 244 | rc = 0; |
| 245 | csocket = NULL; |
| 246 | trans = v9ses->transport; |
| 247 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 248 | trans->status = Disconnected; |
| 249 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 250 | if (strlen(dev_name) > UNIX_PATH_MAX) { |
| 251 | eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n", |
| 252 | dev_name); |
| 253 | return -ENOMEM; |
| 254 | } |
| 255 | |
| 256 | ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL); |
| 257 | if (!ts) |
| 258 | return -ENOMEM; |
| 259 | |
| 260 | trans->priv = ts; |
| 261 | ts->s = NULL; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 262 | ts->filp = NULL; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 263 | |
| 264 | sun_server.sun_family = PF_UNIX; |
| 265 | strcpy(sun_server.sun_path, dev_name); |
| 266 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); |
| 267 | rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
| 268 | sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */ |
| 269 | if (rc < 0) { |
| 270 | eprintk(KERN_ERR, |
| 271 | "v9fs_trans_unix: problem connecting socket: %s: %d\n", |
| 272 | dev_name, rc); |
| 273 | return rc; |
| 274 | } |
| 275 | csocket->sk->sk_allocation = GFP_NOIO; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 276 | |
| 277 | fd = sock_map_fd(csocket); |
| 278 | if (fd < 0) { |
| 279 | sock_release(csocket); |
| 280 | kfree(ts); |
| 281 | trans->priv = NULL; |
| 282 | return fd; |
| 283 | } |
| 284 | |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 285 | ts->s = csocket; |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 286 | ts->filp = fget(fd); |
| 287 | ts->filp->f_flags |= O_NONBLOCK; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 288 | trans->status = Connected; |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * v9fs_sock_close - shutdown socket |
| 295 | * @trans: private socket structure |
| 296 | * |
| 297 | */ |
| 298 | |
| 299 | static void v9fs_sock_close(struct v9fs_transport *trans) |
| 300 | { |
Eric Van Hensbergen | cb2e87a | 2005-09-09 13:04:28 -0700 | [diff] [blame] | 301 | struct v9fs_trans_sock *ts; |
| 302 | |
| 303 | if (!trans) |
| 304 | return; |
| 305 | |
| 306 | ts = trans->priv; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 307 | |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 308 | if ((ts) && (ts->filp)) { |
| 309 | fput(ts->filp); |
| 310 | ts->filp = NULL; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 311 | ts->s = NULL; |
| 312 | trans->status = Disconnected; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 313 | } |
| 314 | |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 315 | kfree(ts); |
Eric Van Hensbergen | cb2e87a | 2005-09-09 13:04:28 -0700 | [diff] [blame] | 316 | |
| 317 | trans->priv = NULL; |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | struct v9fs_transport v9fs_trans_tcp = { |
| 321 | .init = v9fs_tcp_init, |
| 322 | .write = v9fs_sock_send, |
| 323 | .read = v9fs_sock_recv, |
| 324 | .close = v9fs_sock_close, |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 325 | .poll = v9fs_sock_poll, |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 326 | }; |
| 327 | |
| 328 | struct v9fs_transport v9fs_trans_unix = { |
| 329 | .init = v9fs_unix_init, |
| 330 | .write = v9fs_sock_send, |
| 331 | .read = v9fs_sock_recv, |
| 332 | .close = v9fs_sock_close, |
Latchesar Ionkov | 3cf6429 | 2006-01-08 01:04:58 -0800 | [diff] [blame] | 333 | .poll = v9fs_sock_poll, |
Eric Van Hensbergen | 426cc91 | 2005-09-09 13:04:22 -0700 | [diff] [blame] | 334 | }; |