Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET An implementation of the SOCKET network access protocol. |
| 3 | * |
| 4 | * Version: @(#)socket.c 1.1.93 18/02/95 |
| 5 | * |
| 6 | * Authors: Orest Zborowski, <obz@Kodak.COM> |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 7 | * Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 9 | * |
| 10 | * Fixes: |
| 11 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in |
| 12 | * shutdown() |
| 13 | * Alan Cox : verify_area() fixes |
| 14 | * Alan Cox : Removed DDI |
| 15 | * Jonathan Kamens : SOCK_DGRAM reconnect bug |
| 16 | * Alan Cox : Moved a load of checks to the very |
| 17 | * top level. |
| 18 | * Alan Cox : Move address structures to/from user |
| 19 | * mode above the protocol layers. |
| 20 | * Rob Janssen : Allow 0 length sends. |
| 21 | * Alan Cox : Asynchronous I/O support (cribbed from the |
| 22 | * tty drivers). |
| 23 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) |
| 24 | * Jeff Uphoff : Made max number of sockets command-line |
| 25 | * configurable. |
| 26 | * Matti Aarnio : Made the number of sockets dynamic, |
| 27 | * to be allocated when needed, and mr. |
| 28 | * Uphoff's max is used as max to be |
| 29 | * allowed to allocate. |
| 30 | * Linus : Argh. removed all the socket allocation |
| 31 | * altogether: it's in the inode now. |
| 32 | * Alan Cox : Made sock_alloc()/sock_release() public |
| 33 | * for NetROM and future kernel nfsd type |
| 34 | * stuff. |
| 35 | * Alan Cox : sendmsg/recvmsg basics. |
| 36 | * Tom Dyas : Export net symbols. |
| 37 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". |
| 38 | * Alan Cox : Added thread locking to sys_* calls |
| 39 | * for sockets. May have errors at the |
| 40 | * moment. |
| 41 | * Kevin Buhr : Fixed the dumb errors in the above. |
| 42 | * Andi Kleen : Some small cleanups, optimizations, |
| 43 | * and fixed a copy_from_user() bug. |
| 44 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 45 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | * protocol-independent |
| 47 | * |
| 48 | * |
| 49 | * This program is free software; you can redistribute it and/or |
| 50 | * modify it under the terms of the GNU General Public License |
| 51 | * as published by the Free Software Foundation; either version |
| 52 | * 2 of the License, or (at your option) any later version. |
| 53 | * |
| 54 | * |
| 55 | * This module is effectively the top level interface to the BSD socket |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 56 | * paradigm. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | * |
| 58 | * Based upon Swansea University Computer Society NET3.039 |
| 59 | */ |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/mm.h> |
| 62 | #include <linux/smp_lock.h> |
| 63 | #include <linux/socket.h> |
| 64 | #include <linux/file.h> |
| 65 | #include <linux/net.h> |
| 66 | #include <linux/interrupt.h> |
| 67 | #include <linux/netdevice.h> |
| 68 | #include <linux/proc_fs.h> |
| 69 | #include <linux/seq_file.h> |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 70 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | #include <linux/wanrouter.h> |
| 72 | #include <linux/if_bridge.h> |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 73 | #include <linux/if_frad.h> |
| 74 | #include <linux/if_vlan.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | #include <linux/init.h> |
| 76 | #include <linux/poll.h> |
| 77 | #include <linux/cache.h> |
| 78 | #include <linux/module.h> |
| 79 | #include <linux/highmem.h> |
| 80 | #include <linux/divert.h> |
| 81 | #include <linux/mount.h> |
| 82 | #include <linux/security.h> |
| 83 | #include <linux/syscalls.h> |
| 84 | #include <linux/compat.h> |
| 85 | #include <linux/kmod.h> |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 86 | #include <linux/audit.h> |
Adrian Bunk | d86b5e0 | 2006-01-21 00:46:55 +0100 | [diff] [blame] | 87 | #include <linux/wireless.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | #include <asm/uaccess.h> |
| 90 | #include <asm/unistd.h> |
| 91 | |
| 92 | #include <net/compat.h> |
| 93 | |
| 94 | #include <net/sock.h> |
| 95 | #include <linux/netfilter.h> |
| 96 | |
| 97 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
| 98 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *buf, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 99 | size_t size, loff_t pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *buf, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 101 | size_t size, loff_t pos); |
| 102 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | static int sock_close(struct inode *inode, struct file *file); |
| 105 | static unsigned int sock_poll(struct file *file, |
| 106 | struct poll_table_struct *wait); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 107 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 108 | #ifdef CONFIG_COMPAT |
| 109 | static long compat_sock_ioctl(struct file *file, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 110 | unsigned int cmd, unsigned long arg); |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 111 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | static int sock_fasync(int fd, struct file *filp, int on); |
| 113 | static ssize_t sock_readv(struct file *file, const struct iovec *vector, |
| 114 | unsigned long count, loff_t *ppos); |
| 115 | static ssize_t sock_writev(struct file *file, const struct iovec *vector, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 116 | unsigned long count, loff_t *ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 118 | int offset, size_t size, loff_t *ppos, int more); |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | /* |
| 121 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
| 122 | * in the operation structures but are done directly via the socketcall() multiplexor. |
| 123 | */ |
| 124 | |
| 125 | static struct file_operations socket_file_ops = { |
| 126 | .owner = THIS_MODULE, |
| 127 | .llseek = no_llseek, |
| 128 | .aio_read = sock_aio_read, |
| 129 | .aio_write = sock_aio_write, |
| 130 | .poll = sock_poll, |
| 131 | .unlocked_ioctl = sock_ioctl, |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 132 | #ifdef CONFIG_COMPAT |
| 133 | .compat_ioctl = compat_sock_ioctl, |
| 134 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | .mmap = sock_mmap, |
| 136 | .open = sock_no_open, /* special open code to disallow open via /proc */ |
| 137 | .release = sock_close, |
| 138 | .fasync = sock_fasync, |
| 139 | .readv = sock_readv, |
| 140 | .writev = sock_writev, |
Jens Axboe | 5274f05 | 2006-03-30 15:15:30 +0200 | [diff] [blame] | 141 | .sendpage = sock_sendpage, |
| 142 | .splice_write = generic_splice_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
| 145 | /* |
| 146 | * The protocol list. Each protocol is registered in here. |
| 147 | */ |
| 148 | |
| 149 | static struct net_proto_family *net_families[NPROTO]; |
| 150 | |
| 151 | #if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT) |
| 152 | static atomic_t net_family_lockct = ATOMIC_INIT(0); |
| 153 | static DEFINE_SPINLOCK(net_family_lock); |
| 154 | |
| 155 | /* The strategy is: modifications net_family vector are short, do not |
| 156 | sleep and veeery rare, but read access should be free of any exclusive |
| 157 | locks. |
| 158 | */ |
| 159 | |
| 160 | static void net_family_write_lock(void) |
| 161 | { |
| 162 | spin_lock(&net_family_lock); |
| 163 | while (atomic_read(&net_family_lockct) != 0) { |
| 164 | spin_unlock(&net_family_lock); |
| 165 | |
| 166 | yield(); |
| 167 | |
| 168 | spin_lock(&net_family_lock); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static __inline__ void net_family_write_unlock(void) |
| 173 | { |
| 174 | spin_unlock(&net_family_lock); |
| 175 | } |
| 176 | |
| 177 | static __inline__ void net_family_read_lock(void) |
| 178 | { |
| 179 | atomic_inc(&net_family_lockct); |
| 180 | spin_unlock_wait(&net_family_lock); |
| 181 | } |
| 182 | |
| 183 | static __inline__ void net_family_read_unlock(void) |
| 184 | { |
| 185 | atomic_dec(&net_family_lockct); |
| 186 | } |
| 187 | |
| 188 | #else |
| 189 | #define net_family_write_lock() do { } while(0) |
| 190 | #define net_family_write_unlock() do { } while(0) |
| 191 | #define net_family_read_lock() do { } while(0) |
| 192 | #define net_family_read_unlock() do { } while(0) |
| 193 | #endif |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | /* |
| 196 | * Statistics counters of the socket lists |
| 197 | */ |
| 198 | |
| 199 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; |
| 200 | |
| 201 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 202 | * Support routines. |
| 203 | * Move socket addresses back and forth across the kernel/user |
| 204 | * divide and look after the messy bits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | */ |
| 206 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 207 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | 16 for IP, 16 for IPX, |
| 209 | 24 for IPv6, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 210 | about 80 for AX.25 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | must be at least one bigger than |
| 212 | the AF_UNIX size (see net/unix/af_unix.c |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 213 | :unix_mkname()). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /** |
| 217 | * move_addr_to_kernel - copy a socket address into kernel space |
| 218 | * @uaddr: Address in user space |
| 219 | * @kaddr: Address in kernel space |
| 220 | * @ulen: Length in user space |
| 221 | * |
| 222 | * The address is copied into kernel space. If the provided address is |
| 223 | * too long an error code of -EINVAL is returned. If the copy gives |
| 224 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
| 225 | */ |
| 226 | |
| 227 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) |
| 228 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 229 | if (ulen < 0 || ulen > MAX_SOCK_ADDR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 231 | if (ulen == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 233 | if (copy_from_user(kaddr, uaddr, ulen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | return -EFAULT; |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 235 | return audit_sockaddr(ulen, kaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | /** |
| 239 | * move_addr_to_user - copy an address to user space |
| 240 | * @kaddr: kernel space address |
| 241 | * @klen: length of address in kernel |
| 242 | * @uaddr: user space address |
| 243 | * @ulen: pointer to user length field |
| 244 | * |
| 245 | * The value pointed to by ulen on entry is the buffer length available. |
| 246 | * This is overwritten with the buffer space used. -EINVAL is returned |
| 247 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
| 248 | * is returned if either the buffer or the length field are not |
| 249 | * accessible. |
| 250 | * After copying the data up to the limit the user specifies, the true |
| 251 | * length of the data is written over the length limit the user |
| 252 | * specified. Zero is returned for a success. |
| 253 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 254 | |
| 255 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, |
| 256 | int __user *ulen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
| 258 | int err; |
| 259 | int len; |
| 260 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 261 | err = get_user(len, ulen); |
| 262 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | return err; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 264 | if (len > klen) |
| 265 | len = klen; |
| 266 | if (len < 0 || len > MAX_SOCK_ADDR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 268 | if (len) { |
Steve Grubb | d6fe394 | 2006-03-30 12:20:22 -0500 | [diff] [blame] | 269 | if (audit_sockaddr(klen, kaddr)) |
| 270 | return -ENOMEM; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 271 | if (copy_to_user(uaddr, kaddr, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | return -EFAULT; |
| 273 | } |
| 274 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 275 | * "fromlen shall refer to the value before truncation.." |
| 276 | * 1003.1g |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | */ |
| 278 | return __put_user(klen, ulen); |
| 279 | } |
| 280 | |
| 281 | #define SOCKFS_MAGIC 0x534F434B |
| 282 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 283 | static kmem_cache_t *sock_inode_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | static struct inode *sock_alloc_inode(struct super_block *sb) |
| 286 | { |
| 287 | struct socket_alloc *ei; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 288 | |
| 289 | ei = kmem_cache_alloc(sock_inode_cachep, SLAB_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | if (!ei) |
| 291 | return NULL; |
| 292 | init_waitqueue_head(&ei->socket.wait); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | ei->socket.fasync_list = NULL; |
| 295 | ei->socket.state = SS_UNCONNECTED; |
| 296 | ei->socket.flags = 0; |
| 297 | ei->socket.ops = NULL; |
| 298 | ei->socket.sk = NULL; |
| 299 | ei->socket.file = NULL; |
| 300 | ei->socket.flags = 0; |
| 301 | |
| 302 | return &ei->vfs_inode; |
| 303 | } |
| 304 | |
| 305 | static void sock_destroy_inode(struct inode *inode) |
| 306 | { |
| 307 | kmem_cache_free(sock_inode_cachep, |
| 308 | container_of(inode, struct socket_alloc, vfs_inode)); |
| 309 | } |
| 310 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 311 | static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 313 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 315 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) |
| 316 | == SLAB_CTOR_CONSTRUCTOR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | inode_init_once(&ei->vfs_inode); |
| 318 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | static int init_inodecache(void) |
| 321 | { |
| 322 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 323 | sizeof(struct socket_alloc), |
| 324 | 0, |
| 325 | (SLAB_HWCACHE_ALIGN | |
| 326 | SLAB_RECLAIM_ACCOUNT | |
| 327 | SLAB_MEM_SPREAD), |
| 328 | init_once, |
| 329 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | if (sock_inode_cachep == NULL) |
| 331 | return -ENOMEM; |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | static struct super_operations sockfs_ops = { |
| 336 | .alloc_inode = sock_alloc_inode, |
| 337 | .destroy_inode =sock_destroy_inode, |
| 338 | .statfs = simple_statfs, |
| 339 | }; |
| 340 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 341 | static int sockfs_get_sb(struct file_system_type *fs_type, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 342 | int flags, const char *dev_name, void *data, |
| 343 | struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 345 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, |
| 346 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
| 348 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 349 | static struct vfsmount *sock_mnt __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | static struct file_system_type sock_fs_type = { |
| 352 | .name = "sockfs", |
| 353 | .get_sb = sockfs_get_sb, |
| 354 | .kill_sb = kill_anon_super, |
| 355 | }; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | static int sockfs_delete_dentry(struct dentry *dentry) |
| 358 | { |
| 359 | return 1; |
| 360 | } |
| 361 | static struct dentry_operations sockfs_dentry_operations = { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 362 | .d_delete = sockfs_delete_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | }; |
| 364 | |
| 365 | /* |
| 366 | * Obtains the first available file descriptor and sets it up for use. |
| 367 | * |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 368 | * These functions create file structures and maps them to fd space |
| 369 | * of the current process. On success it returns file descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | * and file struct implicitly stored in sock->file. |
| 371 | * Note that another thread may close file descriptor before we return |
| 372 | * from this function. We use the fact that now we do not refer |
| 373 | * to socket after mapping. If one day we will need it, this |
| 374 | * function will increment ref. count on file by 1. |
| 375 | * |
| 376 | * In any case returned fd MAY BE not valid! |
| 377 | * This race condition is unavoidable |
| 378 | * with shared fd spaces, we cannot solve it inside kernel, |
| 379 | * but we take care of internal coherence yet. |
| 380 | */ |
| 381 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 382 | static int sock_alloc_fd(struct file **filep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
| 384 | int fd; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 385 | |
| 386 | fd = get_unused_fd(); |
| 387 | if (likely(fd >= 0)) { |
| 388 | struct file *file = get_empty_filp(); |
| 389 | |
| 390 | *filep = file; |
| 391 | if (unlikely(!file)) { |
| 392 | put_unused_fd(fd); |
| 393 | return -ENFILE; |
| 394 | } |
| 395 | } else |
| 396 | *filep = NULL; |
| 397 | return fd; |
| 398 | } |
| 399 | |
| 400 | static int sock_attach_fd(struct socket *sock, struct file *file) |
| 401 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | struct qstr this; |
| 403 | char name[32]; |
| 404 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 405 | this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); |
| 406 | this.name = name; |
| 407 | this.hash = SOCK_INODE(sock)->i_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 409 | file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); |
| 410 | if (unlikely(!file->f_dentry)) |
| 411 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 413 | file->f_dentry->d_op = &sockfs_dentry_operations; |
| 414 | d_add(file->f_dentry, SOCK_INODE(sock)); |
| 415 | file->f_vfsmnt = mntget(sock_mnt); |
| 416 | file->f_mapping = file->f_dentry->d_inode->i_mapping; |
| 417 | |
| 418 | sock->file = file; |
| 419 | file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; |
| 420 | file->f_mode = FMODE_READ | FMODE_WRITE; |
| 421 | file->f_flags = O_RDWR; |
| 422 | file->f_pos = 0; |
| 423 | file->private_data = sock; |
| 424 | |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | int sock_map_fd(struct socket *sock) |
| 429 | { |
| 430 | struct file *newfile; |
| 431 | int fd = sock_alloc_fd(&newfile); |
| 432 | |
| 433 | if (likely(fd >= 0)) { |
| 434 | int err = sock_attach_fd(sock, newfile); |
| 435 | |
| 436 | if (unlikely(err < 0)) { |
| 437 | put_filp(newfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | put_unused_fd(fd); |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 439 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | } |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 441 | fd_install(fd, newfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return fd; |
| 444 | } |
| 445 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 446 | static struct socket *sock_from_file(struct file *file, int *err) |
| 447 | { |
| 448 | struct inode *inode; |
| 449 | struct socket *sock; |
| 450 | |
| 451 | if (file->f_op == &socket_file_ops) |
| 452 | return file->private_data; /* set in sock_map_fd */ |
| 453 | |
| 454 | inode = file->f_dentry->d_inode; |
| 455 | if (!S_ISSOCK(inode->i_mode)) { |
| 456 | *err = -ENOTSOCK; |
| 457 | return NULL; |
| 458 | } |
| 459 | |
| 460 | sock = SOCKET_I(inode); |
| 461 | if (sock->file != file) { |
| 462 | printk(KERN_ERR "socki_lookup: socket file changed!\n"); |
| 463 | sock->file = file; |
| 464 | } |
| 465 | return sock; |
| 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | /** |
| 469 | * sockfd_lookup - Go from a file number to its socket slot |
| 470 | * @fd: file handle |
| 471 | * @err: pointer to an error code return |
| 472 | * |
| 473 | * The file handle passed in is locked and the socket it is bound |
| 474 | * too is returned. If an error occurs the err pointer is overwritten |
| 475 | * with a negative errno code and NULL is returned. The function checks |
| 476 | * for both invalid handles and passing a handle which is not a socket. |
| 477 | * |
| 478 | * On a success the socket object pointer is returned. |
| 479 | */ |
| 480 | |
| 481 | struct socket *sockfd_lookup(int fd, int *err) |
| 482 | { |
| 483 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | struct socket *sock; |
| 485 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 486 | file = fget(fd); |
| 487 | if (!file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | *err = -EBADF; |
| 489 | return NULL; |
| 490 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 491 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 492 | sock = sock_from_file(file, err); |
| 493 | if (!sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | fput(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | return sock; |
| 496 | } |
| 497 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 498 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
| 499 | { |
| 500 | struct file *file; |
| 501 | struct socket *sock; |
| 502 | |
Hua Zhong | 3672558 | 2006-04-19 15:25:02 -0700 | [diff] [blame] | 503 | *err = -EBADF; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 504 | file = fget_light(fd, fput_needed); |
| 505 | if (file) { |
| 506 | sock = sock_from_file(file, err); |
| 507 | if (sock) |
| 508 | return sock; |
| 509 | fput_light(file, *fput_needed); |
| 510 | } |
| 511 | return NULL; |
| 512 | } |
| 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | /** |
| 515 | * sock_alloc - allocate a socket |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 516 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | * Allocate a new inode and socket object. The two are bound together |
| 518 | * and initialised. The socket is then returned. If we are out of inodes |
| 519 | * NULL is returned. |
| 520 | */ |
| 521 | |
| 522 | static struct socket *sock_alloc(void) |
| 523 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 524 | struct inode *inode; |
| 525 | struct socket *sock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | inode = new_inode(sock_mnt->mnt_sb); |
| 528 | if (!inode) |
| 529 | return NULL; |
| 530 | |
| 531 | sock = SOCKET_I(inode); |
| 532 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 533 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | inode->i_uid = current->fsuid; |
| 535 | inode->i_gid = current->fsgid; |
| 536 | |
| 537 | get_cpu_var(sockets_in_use)++; |
| 538 | put_cpu_var(sockets_in_use); |
| 539 | return sock; |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * In theory you can't get an open on this inode, but /proc provides |
| 544 | * a back door. Remember to keep it shut otherwise you'll let the |
| 545 | * creepy crawlies in. |
| 546 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 547 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
| 549 | { |
| 550 | return -ENXIO; |
| 551 | } |
| 552 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 553 | const struct file_operations bad_sock_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | .owner = THIS_MODULE, |
| 555 | .open = sock_no_open, |
| 556 | }; |
| 557 | |
| 558 | /** |
| 559 | * sock_release - close a socket |
| 560 | * @sock: socket to close |
| 561 | * |
| 562 | * The socket is released from the protocol stack if it has a release |
| 563 | * callback, and the inode is then released if the socket is bound to |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 564 | * an inode not a file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | void sock_release(struct socket *sock) |
| 568 | { |
| 569 | if (sock->ops) { |
| 570 | struct module *owner = sock->ops->owner; |
| 571 | |
| 572 | sock->ops->release(sock); |
| 573 | sock->ops = NULL; |
| 574 | module_put(owner); |
| 575 | } |
| 576 | |
| 577 | if (sock->fasync_list) |
| 578 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
| 579 | |
| 580 | get_cpu_var(sockets_in_use)--; |
| 581 | put_cpu_var(sockets_in_use); |
| 582 | if (!sock->file) { |
| 583 | iput(SOCK_INODE(sock)); |
| 584 | return; |
| 585 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 586 | sock->file = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } |
| 588 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 589 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | struct msghdr *msg, size_t size) |
| 591 | { |
| 592 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
| 593 | int err; |
| 594 | |
| 595 | si->sock = sock; |
| 596 | si->scm = NULL; |
| 597 | si->msg = msg; |
| 598 | si->size = size; |
| 599 | |
| 600 | err = security_socket_sendmsg(sock, msg, size); |
| 601 | if (err) |
| 602 | return err; |
| 603 | |
| 604 | return sock->ops->sendmsg(iocb, sock, msg, size); |
| 605 | } |
| 606 | |
| 607 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
| 608 | { |
| 609 | struct kiocb iocb; |
| 610 | struct sock_iocb siocb; |
| 611 | int ret; |
| 612 | |
| 613 | init_sync_kiocb(&iocb, NULL); |
| 614 | iocb.private = &siocb; |
| 615 | ret = __sock_sendmsg(&iocb, sock, msg, size); |
| 616 | if (-EIOCBQUEUED == ret) |
| 617 | ret = wait_on_sync_kiocb(&iocb); |
| 618 | return ret; |
| 619 | } |
| 620 | |
| 621 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
| 622 | struct kvec *vec, size_t num, size_t size) |
| 623 | { |
| 624 | mm_segment_t oldfs = get_fs(); |
| 625 | int result; |
| 626 | |
| 627 | set_fs(KERNEL_DS); |
| 628 | /* |
| 629 | * the following is safe, since for compiler definitions of kvec and |
| 630 | * iovec are identical, yielding the same in-core layout and alignment |
| 631 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 632 | msg->msg_iov = (struct iovec *)vec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | msg->msg_iovlen = num; |
| 634 | result = sock_sendmsg(sock, msg, size); |
| 635 | set_fs(oldfs); |
| 636 | return result; |
| 637 | } |
| 638 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 639 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | struct msghdr *msg, size_t size, int flags) |
| 641 | { |
| 642 | int err; |
| 643 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
| 644 | |
| 645 | si->sock = sock; |
| 646 | si->scm = NULL; |
| 647 | si->msg = msg; |
| 648 | si->size = size; |
| 649 | si->flags = flags; |
| 650 | |
| 651 | err = security_socket_recvmsg(sock, msg, size, flags); |
| 652 | if (err) |
| 653 | return err; |
| 654 | |
| 655 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); |
| 656 | } |
| 657 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 658 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | size_t size, int flags) |
| 660 | { |
| 661 | struct kiocb iocb; |
| 662 | struct sock_iocb siocb; |
| 663 | int ret; |
| 664 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 665 | init_sync_kiocb(&iocb, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | iocb.private = &siocb; |
| 667 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); |
| 668 | if (-EIOCBQUEUED == ret) |
| 669 | ret = wait_on_sync_kiocb(&iocb); |
| 670 | return ret; |
| 671 | } |
| 672 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 673 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
| 674 | struct kvec *vec, size_t num, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
| 676 | mm_segment_t oldfs = get_fs(); |
| 677 | int result; |
| 678 | |
| 679 | set_fs(KERNEL_DS); |
| 680 | /* |
| 681 | * the following is safe, since for compiler definitions of kvec and |
| 682 | * iovec are identical, yielding the same in-core layout and alignment |
| 683 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 684 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | result = sock_recvmsg(sock, msg, size, flags); |
| 686 | set_fs(oldfs); |
| 687 | return result; |
| 688 | } |
| 689 | |
| 690 | static void sock_aio_dtor(struct kiocb *iocb) |
| 691 | { |
| 692 | kfree(iocb->private); |
| 693 | } |
| 694 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 695 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 696 | int offset, size_t size, loff_t *ppos, int more) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | { |
| 698 | struct socket *sock; |
| 699 | int flags; |
| 700 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 701 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
| 704 | if (more) |
| 705 | flags |= MSG_MORE; |
| 706 | |
| 707 | return sock->ops->sendpage(sock, page, offset, size, flags); |
| 708 | } |
| 709 | |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 710 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 711 | char __user *ubuf, size_t size, |
| 712 | struct sock_iocb *siocb) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 713 | { |
| 714 | if (!is_sync_kiocb(iocb)) { |
| 715 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); |
| 716 | if (!siocb) |
| 717 | return NULL; |
| 718 | iocb->ki_dtor = sock_aio_dtor; |
| 719 | } |
| 720 | |
| 721 | siocb->kiocb = iocb; |
| 722 | siocb->async_iov.iov_base = ubuf; |
| 723 | siocb->async_iov.iov_len = size; |
| 724 | |
| 725 | iocb->private = siocb; |
| 726 | return siocb; |
| 727 | } |
| 728 | |
| 729 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 730 | struct file *file, struct iovec *iov, |
| 731 | unsigned long nr_segs) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 732 | { |
| 733 | struct socket *sock = file->private_data; |
| 734 | size_t size = 0; |
| 735 | int i; |
| 736 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 737 | for (i = 0; i < nr_segs; i++) |
| 738 | size += iov[i].iov_len; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 739 | |
| 740 | msg->msg_name = NULL; |
| 741 | msg->msg_namelen = 0; |
| 742 | msg->msg_control = NULL; |
| 743 | msg->msg_controllen = 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 744 | msg->msg_iov = (struct iovec *)iov; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 745 | msg->msg_iovlen = nr_segs; |
| 746 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| 747 | |
| 748 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); |
| 749 | } |
| 750 | |
| 751 | static ssize_t sock_readv(struct file *file, const struct iovec *iov, |
| 752 | unsigned long nr_segs, loff_t *ppos) |
| 753 | { |
| 754 | struct kiocb iocb; |
| 755 | struct sock_iocb siocb; |
| 756 | struct msghdr msg; |
| 757 | int ret; |
| 758 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 759 | init_sync_kiocb(&iocb, NULL); |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 760 | iocb.private = &siocb; |
| 761 | |
| 762 | ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs); |
| 763 | if (-EIOCBQUEUED == ret) |
| 764 | ret = wait_on_sync_kiocb(&iocb); |
| 765 | return ret; |
| 766 | } |
| 767 | |
| 768 | static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 769 | size_t count, loff_t pos) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 770 | { |
| 771 | struct sock_iocb siocb, *x; |
| 772 | |
| 773 | if (pos != 0) |
| 774 | return -ESPIPE; |
| 775 | if (count == 0) /* Match SYS5 behaviour */ |
| 776 | return 0; |
| 777 | |
| 778 | x = alloc_sock_iocb(iocb, ubuf, count, &siocb); |
| 779 | if (!x) |
| 780 | return -ENOMEM; |
| 781 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 782 | &x->async_iov, 1); |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 786 | struct file *file, struct iovec *iov, |
| 787 | unsigned long nr_segs) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 788 | { |
| 789 | struct socket *sock = file->private_data; |
| 790 | size_t size = 0; |
| 791 | int i; |
| 792 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 793 | for (i = 0; i < nr_segs; i++) |
| 794 | size += iov[i].iov_len; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 795 | |
| 796 | msg->msg_name = NULL; |
| 797 | msg->msg_namelen = 0; |
| 798 | msg->msg_control = NULL; |
| 799 | msg->msg_controllen = 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 800 | msg->msg_iov = (struct iovec *)iov; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 801 | msg->msg_iovlen = nr_segs; |
| 802 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| 803 | if (sock->type == SOCK_SEQPACKET) |
| 804 | msg->msg_flags |= MSG_EOR; |
| 805 | |
| 806 | return __sock_sendmsg(iocb, sock, msg, size); |
| 807 | } |
| 808 | |
| 809 | static ssize_t sock_writev(struct file *file, const struct iovec *iov, |
| 810 | unsigned long nr_segs, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
| 812 | struct msghdr msg; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 813 | struct kiocb iocb; |
| 814 | struct sock_iocb siocb; |
| 815 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 817 | init_sync_kiocb(&iocb, NULL); |
| 818 | iocb.private = &siocb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 820 | ret = do_sock_write(&msg, &iocb, file, (struct iovec *)iov, nr_segs); |
| 821 | if (-EIOCBQUEUED == ret) |
| 822 | ret = wait_on_sync_kiocb(&iocb); |
| 823 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 826 | static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 827 | size_t count, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 829 | struct sock_iocb siocb, *x; |
| 830 | |
| 831 | if (pos != 0) |
| 832 | return -ESPIPE; |
| 833 | if (count == 0) /* Match SYS5 behaviour */ |
| 834 | return 0; |
| 835 | |
| 836 | x = alloc_sock_iocb(iocb, (void __user *)ubuf, count, &siocb); |
| 837 | if (!x) |
| 838 | return -ENOMEM; |
| 839 | |
| 840 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 841 | &x->async_iov, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | } |
| 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | /* |
| 845 | * Atomic setting of ioctl hooks to avoid race |
| 846 | * with module unload. |
| 847 | */ |
| 848 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 849 | static DEFINE_MUTEX(br_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 850 | static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 852 | void brioctl_set(int (*hook) (unsigned int, void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 854 | mutex_lock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | br_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 856 | mutex_unlock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 858 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | EXPORT_SYMBOL(brioctl_set); |
| 860 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 861 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 862 | static int (*vlan_ioctl_hook) (void __user *arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 864 | void vlan_ioctl_set(int (*hook) (void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 866 | mutex_lock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | vlan_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 868 | mutex_unlock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | EXPORT_SYMBOL(vlan_ioctl_set); |
| 872 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 873 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 874 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 876 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 878 | mutex_lock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | dlci_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 880 | mutex_unlock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | EXPORT_SYMBOL(dlci_ioctl_set); |
| 884 | |
| 885 | /* |
| 886 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
| 887 | * what to do with it - that's up to the protocol still. |
| 888 | */ |
| 889 | |
| 890 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 891 | { |
| 892 | struct socket *sock; |
| 893 | void __user *argp = (void __user *)arg; |
| 894 | int pid, err; |
| 895 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 896 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
| 898 | err = dev_ioctl(cmd, argp); |
| 899 | } else |
Adrian Bunk | d86b5e0 | 2006-01-21 00:46:55 +0100 | [diff] [blame] | 900 | #ifdef CONFIG_WIRELESS_EXT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
| 902 | err = dev_ioctl(cmd, argp); |
| 903 | } else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 904 | #endif /* CONFIG_WIRELESS_EXT */ |
| 905 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | case FIOSETOWN: |
| 907 | case SIOCSPGRP: |
| 908 | err = -EFAULT; |
| 909 | if (get_user(pid, (int __user *)argp)) |
| 910 | break; |
| 911 | err = f_setown(sock->file, pid, 1); |
| 912 | break; |
| 913 | case FIOGETOWN: |
| 914 | case SIOCGPGRP: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 915 | err = put_user(sock->file->f_owner.pid, |
| 916 | (int __user *)argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | break; |
| 918 | case SIOCGIFBR: |
| 919 | case SIOCSIFBR: |
| 920 | case SIOCBRADDBR: |
| 921 | case SIOCBRDELBR: |
| 922 | err = -ENOPKG; |
| 923 | if (!br_ioctl_hook) |
| 924 | request_module("bridge"); |
| 925 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 926 | mutex_lock(&br_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 927 | if (br_ioctl_hook) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | err = br_ioctl_hook(cmd, argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 929 | mutex_unlock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | break; |
| 931 | case SIOCGIFVLAN: |
| 932 | case SIOCSIFVLAN: |
| 933 | err = -ENOPKG; |
| 934 | if (!vlan_ioctl_hook) |
| 935 | request_module("8021q"); |
| 936 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 937 | mutex_lock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | if (vlan_ioctl_hook) |
| 939 | err = vlan_ioctl_hook(argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 940 | mutex_unlock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | break; |
| 942 | case SIOCGIFDIVERT: |
| 943 | case SIOCSIFDIVERT: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 944 | /* Convert this to call through a hook */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | err = divert_ioctl(cmd, argp); |
| 946 | break; |
| 947 | case SIOCADDDLCI: |
| 948 | case SIOCDELDLCI: |
| 949 | err = -ENOPKG; |
| 950 | if (!dlci_ioctl_hook) |
| 951 | request_module("dlci"); |
| 952 | |
| 953 | if (dlci_ioctl_hook) { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 954 | mutex_lock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | err = dlci_ioctl_hook(cmd, argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 956 | mutex_unlock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | break; |
| 959 | default: |
| 960 | err = sock->ops->ioctl(sock, cmd, arg); |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 961 | |
| 962 | /* |
| 963 | * If this ioctl is unknown try to hand it down |
| 964 | * to the NIC driver. |
| 965 | */ |
| 966 | if (err == -ENOIOCTLCMD) |
| 967 | err = dev_ioctl(cmd, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | break; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 969 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | return err; |
| 971 | } |
| 972 | |
| 973 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
| 974 | { |
| 975 | int err; |
| 976 | struct socket *sock = NULL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | err = security_socket_create(family, type, protocol, 1); |
| 979 | if (err) |
| 980 | goto out; |
| 981 | |
| 982 | sock = sock_alloc(); |
| 983 | if (!sock) { |
| 984 | err = -ENOMEM; |
| 985 | goto out; |
| 986 | } |
| 987 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | sock->type = type; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 989 | err = security_socket_post_create(sock, family, type, protocol, 1); |
| 990 | if (err) |
| 991 | goto out_release; |
| 992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | out: |
| 994 | *res = sock; |
| 995 | return err; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 996 | out_release: |
| 997 | sock_release(sock); |
| 998 | sock = NULL; |
| 999 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | /* No kernel lock held - perfect */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1003 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | { |
| 1005 | struct socket *sock; |
| 1006 | |
| 1007 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1008 | * We can't return errors to poll, so it's either yes or no. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | */ |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 1010 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | return sock->ops->poll(file, sock, wait); |
| 1012 | } |
| 1013 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1014 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | { |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 1016 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
| 1018 | return sock->ops->mmap(file, sock, vma); |
| 1019 | } |
| 1020 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1021 | static int sock_close(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | { |
| 1023 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1024 | * It was possible the inode is NULL we were |
| 1025 | * closing an unfinished socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | */ |
| 1027 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1028 | if (!inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
| 1030 | return 0; |
| 1031 | } |
| 1032 | sock_fasync(-1, filp, 0); |
| 1033 | sock_release(SOCKET_I(inode)); |
| 1034 | return 0; |
| 1035 | } |
| 1036 | |
| 1037 | /* |
| 1038 | * Update the socket async list |
| 1039 | * |
| 1040 | * Fasync_list locking strategy. |
| 1041 | * |
| 1042 | * 1. fasync_list is modified only under process context socket lock |
| 1043 | * i.e. under semaphore. |
| 1044 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
| 1045 | * or under socket lock. |
| 1046 | * 3. fasync_list can be used from softirq context, so that |
| 1047 | * modification under socket lock have to be enhanced with |
| 1048 | * write_lock_bh(&sk->sk_callback_lock). |
| 1049 | * --ANK (990710) |
| 1050 | */ |
| 1051 | |
| 1052 | static int sock_fasync(int fd, struct file *filp, int on) |
| 1053 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1054 | struct fasync_struct *fa, *fna = NULL, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | struct socket *sock; |
| 1056 | struct sock *sk; |
| 1057 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1058 | if (on) { |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 1059 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1060 | if (fna == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | return -ENOMEM; |
| 1062 | } |
| 1063 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 1064 | sock = filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1066 | sk = sock->sk; |
| 1067 | if (sk == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | kfree(fna); |
| 1069 | return -EINVAL; |
| 1070 | } |
| 1071 | |
| 1072 | lock_sock(sk); |
| 1073 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1074 | prev = &(sock->fasync_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1076 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
| 1077 | if (fa->fa_file == filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | break; |
| 1079 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1080 | if (on) { |
| 1081 | if (fa != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1083 | fa->fa_fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | write_unlock_bh(&sk->sk_callback_lock); |
| 1085 | |
| 1086 | kfree(fna); |
| 1087 | goto out; |
| 1088 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1089 | fna->fa_file = filp; |
| 1090 | fna->fa_fd = fd; |
| 1091 | fna->magic = FASYNC_MAGIC; |
| 1092 | fna->fa_next = sock->fasync_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1094 | sock->fasync_list = fna; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | write_unlock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1096 | } else { |
| 1097 | if (fa != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1099 | *prev = fa->fa_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | write_unlock_bh(&sk->sk_callback_lock); |
| 1101 | kfree(fa); |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | out: |
| 1106 | release_sock(sock->sk); |
| 1107 | return 0; |
| 1108 | } |
| 1109 | |
| 1110 | /* This function may be called only under socket lock or callback_lock */ |
| 1111 | |
| 1112 | int sock_wake_async(struct socket *sock, int how, int band) |
| 1113 | { |
| 1114 | if (!sock || !sock->fasync_list) |
| 1115 | return -1; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1116 | switch (how) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | case 1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
| 1120 | break; |
| 1121 | goto call_kill; |
| 1122 | case 2: |
| 1123 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
| 1124 | break; |
| 1125 | /* fall through */ |
| 1126 | case 0: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1127 | call_kill: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | __kill_fasync(sock->fasync_list, SIGIO, band); |
| 1129 | break; |
| 1130 | case 3: |
| 1131 | __kill_fasync(sock->fasync_list, SIGURG, band); |
| 1132 | } |
| 1133 | return 0; |
| 1134 | } |
| 1135 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1136 | static int __sock_create(int family, int type, int protocol, |
| 1137 | struct socket **res, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | { |
| 1139 | int err; |
| 1140 | struct socket *sock; |
| 1141 | |
| 1142 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1143 | * Check protocol is in range |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | */ |
| 1145 | if (family < 0 || family >= NPROTO) |
| 1146 | return -EAFNOSUPPORT; |
| 1147 | if (type < 0 || type >= SOCK_MAX) |
| 1148 | return -EINVAL; |
| 1149 | |
| 1150 | /* Compatibility. |
| 1151 | |
| 1152 | This uglymoron is moved from INET layer to here to avoid |
| 1153 | deadlock in module load. |
| 1154 | */ |
| 1155 | if (family == PF_INET && type == SOCK_PACKET) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1156 | static int warned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | if (!warned) { |
| 1158 | warned = 1; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1159 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
| 1160 | current->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | } |
| 1162 | family = PF_PACKET; |
| 1163 | } |
| 1164 | |
| 1165 | err = security_socket_create(family, type, protocol, kern); |
| 1166 | if (err) |
| 1167 | return err; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | #if defined(CONFIG_KMOD) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1170 | /* Attempt to load a protocol module if the find failed. |
| 1171 | * |
| 1172 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | * requested real, full-featured networking support upon configuration. |
| 1174 | * Otherwise module support will break! |
| 1175 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1176 | if (net_families[family] == NULL) { |
| 1177 | request_module("net-pf-%d", family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
| 1179 | #endif |
| 1180 | |
| 1181 | net_family_read_lock(); |
| 1182 | if (net_families[family] == NULL) { |
| 1183 | err = -EAFNOSUPPORT; |
| 1184 | goto out; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * Allocate the socket and allow the family to set things up. if |
| 1189 | * the protocol is 0, the family is instructed to select an appropriate |
| 1190 | * default. |
| 1191 | */ |
| 1192 | |
| 1193 | if (!(sock = sock_alloc())) { |
Akinobu Mita | 5991c84 | 2006-08-31 15:21:50 -0700 | [diff] [blame] | 1194 | if (net_ratelimit()) |
| 1195 | printk(KERN_WARNING "socket: no more sockets\n"); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1196 | err = -ENFILE; /* Not exactly a match, but its the |
| 1197 | closest posix thing */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | goto out; |
| 1199 | } |
| 1200 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1201 | sock->type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | /* |
| 1204 | * We will call the ->create function, that possibly is in a loadable |
| 1205 | * module, so we have to bump that loadable module refcnt first. |
| 1206 | */ |
| 1207 | err = -EAFNOSUPPORT; |
| 1208 | if (!try_module_get(net_families[family]->owner)) |
| 1209 | goto out_release; |
| 1210 | |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1211 | if ((err = net_families[family]->create(sock, protocol)) < 0) { |
| 1212 | sock->ops = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | goto out_module_put; |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1214 | } |
| 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | /* |
| 1217 | * Now to bump the refcnt of the [loadable] module that owns this |
| 1218 | * socket at sock_release time we decrement its refcnt. |
| 1219 | */ |
| 1220 | if (!try_module_get(sock->ops->owner)) { |
| 1221 | sock->ops = NULL; |
| 1222 | goto out_module_put; |
| 1223 | } |
| 1224 | /* |
| 1225 | * Now that we're done with the ->create function, the [loadable] |
| 1226 | * module can have its refcnt decremented |
| 1227 | */ |
| 1228 | module_put(net_families[family]->owner); |
| 1229 | *res = sock; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 1230 | err = security_socket_post_create(sock, family, type, protocol, kern); |
| 1231 | if (err) |
| 1232 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
| 1234 | out: |
| 1235 | net_family_read_unlock(); |
| 1236 | return err; |
| 1237 | out_module_put: |
| 1238 | module_put(net_families[family]->owner); |
| 1239 | out_release: |
| 1240 | sock_release(sock); |
| 1241 | goto out; |
| 1242 | } |
| 1243 | |
| 1244 | int sock_create(int family, int type, int protocol, struct socket **res) |
| 1245 | { |
| 1246 | return __sock_create(family, type, protocol, res, 0); |
| 1247 | } |
| 1248 | |
| 1249 | int sock_create_kern(int family, int type, int protocol, struct socket **res) |
| 1250 | { |
| 1251 | return __sock_create(family, type, protocol, res, 1); |
| 1252 | } |
| 1253 | |
| 1254 | asmlinkage long sys_socket(int family, int type, int protocol) |
| 1255 | { |
| 1256 | int retval; |
| 1257 | struct socket *sock; |
| 1258 | |
| 1259 | retval = sock_create(family, type, protocol, &sock); |
| 1260 | if (retval < 0) |
| 1261 | goto out; |
| 1262 | |
| 1263 | retval = sock_map_fd(sock); |
| 1264 | if (retval < 0) |
| 1265 | goto out_release; |
| 1266 | |
| 1267 | out: |
| 1268 | /* It may be already another descriptor 8) Not kernel problem. */ |
| 1269 | return retval; |
| 1270 | |
| 1271 | out_release: |
| 1272 | sock_release(sock); |
| 1273 | return retval; |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * Create a pair of connected sockets. |
| 1278 | */ |
| 1279 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1280 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
| 1281 | int __user *usockvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | { |
| 1283 | struct socket *sock1, *sock2; |
| 1284 | int fd1, fd2, err; |
| 1285 | |
| 1286 | /* |
| 1287 | * Obtain the first socket and check if the underlying protocol |
| 1288 | * supports the socketpair call. |
| 1289 | */ |
| 1290 | |
| 1291 | err = sock_create(family, type, protocol, &sock1); |
| 1292 | if (err < 0) |
| 1293 | goto out; |
| 1294 | |
| 1295 | err = sock_create(family, type, protocol, &sock2); |
| 1296 | if (err < 0) |
| 1297 | goto out_release_1; |
| 1298 | |
| 1299 | err = sock1->ops->socketpair(sock1, sock2); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1300 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | goto out_release_both; |
| 1302 | |
| 1303 | fd1 = fd2 = -1; |
| 1304 | |
| 1305 | err = sock_map_fd(sock1); |
| 1306 | if (err < 0) |
| 1307 | goto out_release_both; |
| 1308 | fd1 = err; |
| 1309 | |
| 1310 | err = sock_map_fd(sock2); |
| 1311 | if (err < 0) |
| 1312 | goto out_close_1; |
| 1313 | fd2 = err; |
| 1314 | |
| 1315 | /* fd1 and fd2 may be already another descriptors. |
| 1316 | * Not kernel problem. |
| 1317 | */ |
| 1318 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1319 | err = put_user(fd1, &usockvec[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | if (!err) |
| 1321 | err = put_user(fd2, &usockvec[1]); |
| 1322 | if (!err) |
| 1323 | return 0; |
| 1324 | |
| 1325 | sys_close(fd2); |
| 1326 | sys_close(fd1); |
| 1327 | return err; |
| 1328 | |
| 1329 | out_close_1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1330 | sock_release(sock2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | sys_close(fd1); |
| 1332 | return err; |
| 1333 | |
| 1334 | out_release_both: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1335 | sock_release(sock2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | out_release_1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1337 | sock_release(sock1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | out: |
| 1339 | return err; |
| 1340 | } |
| 1341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | /* |
| 1343 | * Bind a name to a socket. Nothing much to do here since it's |
| 1344 | * the protocol's responsibility to handle the local address. |
| 1345 | * |
| 1346 | * We move the socket address to kernel space before we call |
| 1347 | * the protocol layer (having also checked the address is ok). |
| 1348 | */ |
| 1349 | |
| 1350 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
| 1351 | { |
| 1352 | struct socket *sock; |
| 1353 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1354 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1356 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1357 | if(sock) { |
| 1358 | err = move_addr_to_kernel(umyaddr, addrlen, address); |
| 1359 | if (err >= 0) { |
| 1360 | err = security_socket_bind(sock, |
| 1361 | (struct sockaddr *)address, |
| 1362 | addrlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1363 | if (!err) |
| 1364 | err = sock->ops->bind(sock, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1365 | (struct sockaddr *) |
| 1366 | address, addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | } |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1368 | fput_light(sock->file, fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return err; |
| 1371 | } |
| 1372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | /* |
| 1374 | * Perform a listen. Basically, we allow the protocol to do anything |
| 1375 | * necessary for a listen, and if that works, we mark the socket as |
| 1376 | * ready for listening. |
| 1377 | */ |
| 1378 | |
| 1379 | int sysctl_somaxconn = SOMAXCONN; |
| 1380 | |
| 1381 | asmlinkage long sys_listen(int fd, int backlog) |
| 1382 | { |
| 1383 | struct socket *sock; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1384 | int err, fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1385 | |
| 1386 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1387 | if (sock) { |
| 1388 | if ((unsigned)backlog > sysctl_somaxconn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | backlog = sysctl_somaxconn; |
| 1390 | |
| 1391 | err = security_socket_listen(sock, backlog); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1392 | if (!err) |
| 1393 | err = sock->ops->listen(sock, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1395 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | } |
| 1397 | return err; |
| 1398 | } |
| 1399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | /* |
| 1401 | * For accept, we attempt to create a new socket, set up the link |
| 1402 | * with the client, wake up the client, then return the new |
| 1403 | * connected fd. We collect the address of the connector in kernel |
| 1404 | * space and move it to user at the very end. This is unclean because |
| 1405 | * we open the socket then return an error. |
| 1406 | * |
| 1407 | * 1003.1g adds the ability to recvmsg() to query connection pending |
| 1408 | * status to recvmsg. We need to add that support in a way thats |
| 1409 | * clean when we restucture accept also. |
| 1410 | */ |
| 1411 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1412 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
| 1413 | int __user *upeer_addrlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
| 1415 | struct socket *sock, *newsock; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1416 | struct file *newfile; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1417 | int err, len, newfd, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | char address[MAX_SOCK_ADDR]; |
| 1419 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1420 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | if (!sock) |
| 1422 | goto out; |
| 1423 | |
| 1424 | err = -ENFILE; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1425 | if (!(newsock = sock_alloc())) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | goto out_put; |
| 1427 | |
| 1428 | newsock->type = sock->type; |
| 1429 | newsock->ops = sock->ops; |
| 1430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | /* |
| 1432 | * We don't need try_module_get here, as the listening socket (sock) |
| 1433 | * has the protocol module (sock->ops->owner) held. |
| 1434 | */ |
| 1435 | __module_get(newsock->ops->owner); |
| 1436 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1437 | newfd = sock_alloc_fd(&newfile); |
| 1438 | if (unlikely(newfd < 0)) { |
| 1439 | err = newfd; |
David S. Miller | 9a1875e | 2006-04-01 12:48:36 -0800 | [diff] [blame] | 1440 | sock_release(newsock); |
| 1441 | goto out_put; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1442 | } |
| 1443 | |
| 1444 | err = sock_attach_fd(newsock, newfile); |
| 1445 | if (err < 0) |
| 1446 | goto out_fd; |
| 1447 | |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1448 | err = security_socket_accept(sock, newsock); |
| 1449 | if (err) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1450 | goto out_fd; |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1451 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
| 1453 | if (err < 0) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1454 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
| 1456 | if (upeer_sockaddr) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1457 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
| 1458 | &len, 2) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | err = -ECONNABORTED; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1460 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1462 | err = move_addr_to_user(address, len, upeer_sockaddr, |
| 1463 | upeer_addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | if (err < 0) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1465 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | } |
| 1467 | |
| 1468 | /* File flags are not inherited via accept() unlike another OSes. */ |
| 1469 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1470 | fd_install(newfd, newfile); |
| 1471 | err = newfd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
| 1473 | security_socket_post_accept(sock, newsock); |
| 1474 | |
| 1475 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1476 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | out: |
| 1478 | return err; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1479 | out_fd: |
David S. Miller | 9606a21 | 2006-04-01 01:00:14 -0800 | [diff] [blame] | 1480 | fput(newfile); |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1481 | put_unused_fd(newfd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | goto out_put; |
| 1483 | } |
| 1484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | /* |
| 1486 | * Attempt to connect to a socket with the server address. The address |
| 1487 | * is in user space so we verify it is OK and move it to kernel space. |
| 1488 | * |
| 1489 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
| 1490 | * break bindings |
| 1491 | * |
| 1492 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
| 1493 | * other SEQPACKET protocols that take time to connect() as it doesn't |
| 1494 | * include the -EINPROGRESS status for such sockets. |
| 1495 | */ |
| 1496 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1497 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
| 1498 | int addrlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | { |
| 1500 | struct socket *sock; |
| 1501 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1502 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1504 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | if (!sock) |
| 1506 | goto out; |
| 1507 | err = move_addr_to_kernel(uservaddr, addrlen, address); |
| 1508 | if (err < 0) |
| 1509 | goto out_put; |
| 1510 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1511 | err = |
| 1512 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | if (err) |
| 1514 | goto out_put; |
| 1515 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1516 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | sock->file->f_flags); |
| 1518 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1519 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | out: |
| 1521 | return err; |
| 1522 | } |
| 1523 | |
| 1524 | /* |
| 1525 | * Get the local address ('name') of a socket object. Move the obtained |
| 1526 | * name to user space. |
| 1527 | */ |
| 1528 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1529 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
| 1530 | int __user *usockaddr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | { |
| 1532 | struct socket *sock; |
| 1533 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1534 | int len, err, fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1535 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1536 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | if (!sock) |
| 1538 | goto out; |
| 1539 | |
| 1540 | err = security_socket_getsockname(sock); |
| 1541 | if (err) |
| 1542 | goto out_put; |
| 1543 | |
| 1544 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); |
| 1545 | if (err) |
| 1546 | goto out_put; |
| 1547 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); |
| 1548 | |
| 1549 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1550 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | out: |
| 1552 | return err; |
| 1553 | } |
| 1554 | |
| 1555 | /* |
| 1556 | * Get the remote address ('name') of a socket object. Move the obtained |
| 1557 | * name to user space. |
| 1558 | */ |
| 1559 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1560 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
| 1561 | int __user *usockaddr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | { |
| 1563 | struct socket *sock; |
| 1564 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1565 | int len, err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1567 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1568 | if (sock != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | err = security_socket_getpeername(sock); |
| 1570 | if (err) { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1571 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | return err; |
| 1573 | } |
| 1574 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1575 | err = |
| 1576 | sock->ops->getname(sock, (struct sockaddr *)address, &len, |
| 1577 | 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | if (!err) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1579 | err = move_addr_to_user(address, len, usockaddr, |
| 1580 | usockaddr_len); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1581 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | } |
| 1583 | return err; |
| 1584 | } |
| 1585 | |
| 1586 | /* |
| 1587 | * Send a datagram to a given address. We move the address into kernel |
| 1588 | * space and check the user space data area is readable before invoking |
| 1589 | * the protocol. |
| 1590 | */ |
| 1591 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1592 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
| 1593 | unsigned flags, struct sockaddr __user *addr, |
| 1594 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | { |
| 1596 | struct socket *sock; |
| 1597 | char address[MAX_SOCK_ADDR]; |
| 1598 | int err; |
| 1599 | struct msghdr msg; |
| 1600 | struct iovec iov; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1601 | int fput_needed; |
| 1602 | struct file *sock_file; |
| 1603 | |
| 1604 | sock_file = fget_light(fd, &fput_needed); |
| 1605 | if (!sock_file) |
| 1606 | return -EBADF; |
| 1607 | |
| 1608 | sock = sock_from_file(sock_file, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | if (!sock) |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1610 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1611 | iov.iov_base = buff; |
| 1612 | iov.iov_len = len; |
| 1613 | msg.msg_name = NULL; |
| 1614 | msg.msg_iov = &iov; |
| 1615 | msg.msg_iovlen = 1; |
| 1616 | msg.msg_control = NULL; |
| 1617 | msg.msg_controllen = 0; |
| 1618 | msg.msg_namelen = 0; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1619 | if (addr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | err = move_addr_to_kernel(addr, addr_len, address); |
| 1621 | if (err < 0) |
| 1622 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1623 | msg.msg_name = address; |
| 1624 | msg.msg_namelen = addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | } |
| 1626 | if (sock->file->f_flags & O_NONBLOCK) |
| 1627 | flags |= MSG_DONTWAIT; |
| 1628 | msg.msg_flags = flags; |
| 1629 | err = sock_sendmsg(sock, &msg, len); |
| 1630 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1631 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1632 | fput_light(sock_file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | return err; |
| 1634 | } |
| 1635 | |
| 1636 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1637 | * Send a datagram down a socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | */ |
| 1639 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1640 | asmlinkage long sys_send(int fd, void __user *buff, size_t len, unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | { |
| 1642 | return sys_sendto(fd, buff, len, flags, NULL, 0); |
| 1643 | } |
| 1644 | |
| 1645 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1646 | * Receive a frame from the socket and optionally record the address of the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | * sender. We verify the buffers are writable and if needed move the |
| 1648 | * sender address from kernel to user space. |
| 1649 | */ |
| 1650 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1651 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
| 1652 | unsigned flags, struct sockaddr __user *addr, |
| 1653 | int __user *addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | { |
| 1655 | struct socket *sock; |
| 1656 | struct iovec iov; |
| 1657 | struct msghdr msg; |
| 1658 | char address[MAX_SOCK_ADDR]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1659 | int err, err2; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1660 | struct file *sock_file; |
| 1661 | int fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1663 | sock_file = fget_light(fd, &fput_needed); |
| 1664 | if (!sock_file) |
| 1665 | return -EBADF; |
| 1666 | |
| 1667 | sock = sock_from_file(sock_file, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | if (!sock) |
| 1669 | goto out; |
| 1670 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1671 | msg.msg_control = NULL; |
| 1672 | msg.msg_controllen = 0; |
| 1673 | msg.msg_iovlen = 1; |
| 1674 | msg.msg_iov = &iov; |
| 1675 | iov.iov_len = size; |
| 1676 | iov.iov_base = ubuf; |
| 1677 | msg.msg_name = address; |
| 1678 | msg.msg_namelen = MAX_SOCK_ADDR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | if (sock->file->f_flags & O_NONBLOCK) |
| 1680 | flags |= MSG_DONTWAIT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1681 | err = sock_recvmsg(sock, &msg, size, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1683 | if (err >= 0 && addr != NULL) { |
| 1684 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); |
| 1685 | if (err2 < 0) |
| 1686 | err = err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | out: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1689 | fput_light(sock_file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | return err; |
| 1691 | } |
| 1692 | |
| 1693 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1694 | * Receive a datagram from a socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | */ |
| 1696 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1697 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
| 1698 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | { |
| 1700 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
| 1701 | } |
| 1702 | |
| 1703 | /* |
| 1704 | * Set a socket option. Because we don't know the option lengths we have |
| 1705 | * to pass the user mode parameter for the protocols to sort out. |
| 1706 | */ |
| 1707 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1708 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
| 1709 | char __user *optval, int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1711 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | struct socket *sock; |
| 1713 | |
| 1714 | if (optlen < 0) |
| 1715 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1716 | |
| 1717 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1718 | if (sock != NULL) { |
| 1719 | err = security_socket_setsockopt(sock, level, optname); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1720 | if (err) |
| 1721 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
| 1723 | if (level == SOL_SOCKET) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1724 | err = |
| 1725 | sock_setsockopt(sock, level, optname, optval, |
| 1726 | optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1728 | err = |
| 1729 | sock->ops->setsockopt(sock, level, optname, optval, |
| 1730 | optlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1731 | out_put: |
| 1732 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | return err; |
| 1735 | } |
| 1736 | |
| 1737 | /* |
| 1738 | * Get a socket option. Because we don't know the option lengths we have |
| 1739 | * to pass a user mode parameter for the protocols to sort out. |
| 1740 | */ |
| 1741 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1742 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
| 1743 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1745 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | struct socket *sock; |
| 1747 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1748 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1749 | if (sock != NULL) { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1750 | err = security_socket_getsockopt(sock, level, optname); |
| 1751 | if (err) |
| 1752 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | |
| 1754 | if (level == SOL_SOCKET) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1755 | err = |
| 1756 | sock_getsockopt(sock, level, optname, optval, |
| 1757 | optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1759 | err = |
| 1760 | sock->ops->getsockopt(sock, level, optname, optval, |
| 1761 | optlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1762 | out_put: |
| 1763 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | } |
| 1765 | return err; |
| 1766 | } |
| 1767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | /* |
| 1769 | * Shutdown a socket. |
| 1770 | */ |
| 1771 | |
| 1772 | asmlinkage long sys_shutdown(int fd, int how) |
| 1773 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1774 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | struct socket *sock; |
| 1776 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1777 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1778 | if (sock != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | err = security_socket_shutdown(sock, how); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1780 | if (!err) |
| 1781 | err = sock->ops->shutdown(sock, how); |
| 1782 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | } |
| 1784 | return err; |
| 1785 | } |
| 1786 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1787 | /* A couple of helpful macros for getting the address of the 32/64 bit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | * fields which are the same type (int / unsigned) on our platforms. |
| 1789 | */ |
| 1790 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
| 1791 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
| 1792 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
| 1793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | /* |
| 1795 | * BSD sendmsg interface |
| 1796 | */ |
| 1797 | |
| 1798 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) |
| 1799 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1800 | struct compat_msghdr __user *msg_compat = |
| 1801 | (struct compat_msghdr __user *)msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | struct socket *sock; |
| 1803 | char address[MAX_SOCK_ADDR]; |
| 1804 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
Alex Williamson | b9d717a | 2005-09-26 14:28:02 -0700 | [diff] [blame] | 1805 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1806 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
| 1807 | /* 20 is size of ipv6_pktinfo */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1808 | unsigned char *ctl_buf = ctl; |
| 1809 | struct msghdr msg_sys; |
| 1810 | int err, ctl_len, iov_size, total_len; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1811 | int fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | err = -EFAULT; |
| 1814 | if (MSG_CMSG_COMPAT & flags) { |
| 1815 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
| 1816 | return -EFAULT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1817 | } |
| 1818 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | return -EFAULT; |
| 1820 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1821 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1822 | if (!sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | goto out; |
| 1824 | |
| 1825 | /* do not move before msg_sys is valid */ |
| 1826 | err = -EMSGSIZE; |
| 1827 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| 1828 | goto out_put; |
| 1829 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1830 | /* Check whether to allocate the iovec area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | err = -ENOMEM; |
| 1832 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| 1833 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| 1834 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| 1835 | if (!iov) |
| 1836 | goto out_put; |
| 1837 | } |
| 1838 | |
| 1839 | /* This will also move the address data into kernel space */ |
| 1840 | if (MSG_CMSG_COMPAT & flags) { |
| 1841 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); |
| 1842 | } else |
| 1843 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1844 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | goto out_freeiov; |
| 1846 | total_len = err; |
| 1847 | |
| 1848 | err = -ENOBUFS; |
| 1849 | |
| 1850 | if (msg_sys.msg_controllen > INT_MAX) |
| 1851 | goto out_freeiov; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1852 | ctl_len = msg_sys.msg_controllen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1854 | err = |
| 1855 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, |
| 1856 | sizeof(ctl)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | if (err) |
| 1858 | goto out_freeiov; |
| 1859 | ctl_buf = msg_sys.msg_control; |
Al Viro | 8920e8f | 2005-09-07 18:28:51 -0700 | [diff] [blame] | 1860 | ctl_len = msg_sys.msg_controllen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | } else if (ctl_len) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1862 | if (ctl_len > sizeof(ctl)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1864 | if (ctl_buf == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | goto out_freeiov; |
| 1866 | } |
| 1867 | err = -EFAULT; |
| 1868 | /* |
| 1869 | * Careful! Before this, msg_sys.msg_control contains a user pointer. |
| 1870 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
| 1871 | * checking falls down on this. |
| 1872 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1873 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
| 1874 | ctl_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | goto out_freectl; |
| 1876 | msg_sys.msg_control = ctl_buf; |
| 1877 | } |
| 1878 | msg_sys.msg_flags = flags; |
| 1879 | |
| 1880 | if (sock->file->f_flags & O_NONBLOCK) |
| 1881 | msg_sys.msg_flags |= MSG_DONTWAIT; |
| 1882 | err = sock_sendmsg(sock, &msg_sys, total_len); |
| 1883 | |
| 1884 | out_freectl: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1885 | if (ctl_buf != ctl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
| 1887 | out_freeiov: |
| 1888 | if (iov != iovstack) |
| 1889 | sock_kfree_s(sock->sk, iov, iov_size); |
| 1890 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1891 | fput_light(sock->file, fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1892 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | return err; |
| 1894 | } |
| 1895 | |
| 1896 | /* |
| 1897 | * BSD recvmsg interface |
| 1898 | */ |
| 1899 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1900 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
| 1901 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1903 | struct compat_msghdr __user *msg_compat = |
| 1904 | (struct compat_msghdr __user *)msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | struct socket *sock; |
| 1906 | struct iovec iovstack[UIO_FASTIOV]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1907 | struct iovec *iov = iovstack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | struct msghdr msg_sys; |
| 1909 | unsigned long cmsg_ptr; |
| 1910 | int err, iov_size, total_len, len; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1911 | int fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | |
| 1913 | /* kernel mode address */ |
| 1914 | char addr[MAX_SOCK_ADDR]; |
| 1915 | |
| 1916 | /* user mode address pointers */ |
| 1917 | struct sockaddr __user *uaddr; |
| 1918 | int __user *uaddr_len; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | if (MSG_CMSG_COMPAT & flags) { |
| 1921 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
| 1922 | return -EFAULT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1923 | } |
| 1924 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) |
| 1925 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1927 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | if (!sock) |
| 1929 | goto out; |
| 1930 | |
| 1931 | err = -EMSGSIZE; |
| 1932 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| 1933 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1934 | |
| 1935 | /* Check whether to allocate the iovec area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | err = -ENOMEM; |
| 1937 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| 1938 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| 1939 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| 1940 | if (!iov) |
| 1941 | goto out_put; |
| 1942 | } |
| 1943 | |
| 1944 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1945 | * Save the user-mode address (verify_iovec will change the |
| 1946 | * kernel msghdr to use the kernel address space) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1948 | |
| 1949 | uaddr = (void __user *)msg_sys.msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | uaddr_len = COMPAT_NAMELEN(msg); |
| 1951 | if (MSG_CMSG_COMPAT & flags) { |
| 1952 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
| 1953 | } else |
| 1954 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
| 1955 | if (err < 0) |
| 1956 | goto out_freeiov; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1957 | total_len = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | |
| 1959 | cmsg_ptr = (unsigned long)msg_sys.msg_control; |
| 1960 | msg_sys.msg_flags = 0; |
| 1961 | if (MSG_CMSG_COMPAT & flags) |
| 1962 | msg_sys.msg_flags = MSG_CMSG_COMPAT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1963 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | if (sock->file->f_flags & O_NONBLOCK) |
| 1965 | flags |= MSG_DONTWAIT; |
| 1966 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); |
| 1967 | if (err < 0) |
| 1968 | goto out_freeiov; |
| 1969 | len = err; |
| 1970 | |
| 1971 | if (uaddr != NULL) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1972 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
| 1973 | uaddr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | if (err < 0) |
| 1975 | goto out_freeiov; |
| 1976 | } |
David S. Miller | 37f7f42 | 2005-09-16 16:51:01 -0700 | [diff] [blame] | 1977 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
| 1978 | COMPAT_FLAGS(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | if (err) |
| 1980 | goto out_freeiov; |
| 1981 | if (MSG_CMSG_COMPAT & flags) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1982 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | &msg_compat->msg_controllen); |
| 1984 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 1985 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | &msg->msg_controllen); |
| 1987 | if (err) |
| 1988 | goto out_freeiov; |
| 1989 | err = len; |
| 1990 | |
| 1991 | out_freeiov: |
| 1992 | if (iov != iovstack) |
| 1993 | sock_kfree_s(sock->sk, iov, iov_size); |
| 1994 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1995 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | out: |
| 1997 | return err; |
| 1998 | } |
| 1999 | |
| 2000 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
| 2001 | |
| 2002 | /* Argument list sizes for sys_socketcall */ |
| 2003 | #define AL(x) ((x) * sizeof(unsigned long)) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2004 | static const unsigned char nargs[18]={ |
| 2005 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), |
| 2006 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), |
| 2007 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) |
| 2008 | }; |
| 2009 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | #undef AL |
| 2011 | |
| 2012 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2013 | * System call vectors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | * |
| 2015 | * Argument checking cleaned up. Saved 20% in size. |
| 2016 | * This function doesn't need to set the kernel lock because |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2017 | * it is set by the callees. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | */ |
| 2019 | |
| 2020 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) |
| 2021 | { |
| 2022 | unsigned long a[6]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2023 | unsigned long a0, a1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | int err; |
| 2025 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2026 | if (call < 1 || call > SYS_RECVMSG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | return -EINVAL; |
| 2028 | |
| 2029 | /* copy_from_user should be SMP safe. */ |
| 2030 | if (copy_from_user(a, args, nargs[call])) |
| 2031 | return -EFAULT; |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 2032 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2033 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 2034 | if (err) |
| 2035 | return err; |
| 2036 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2037 | a0 = a[0]; |
| 2038 | a1 = a[1]; |
| 2039 | |
| 2040 | switch (call) { |
| 2041 | case SYS_SOCKET: |
| 2042 | err = sys_socket(a0, a1, a[2]); |
| 2043 | break; |
| 2044 | case SYS_BIND: |
| 2045 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
| 2046 | break; |
| 2047 | case SYS_CONNECT: |
| 2048 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
| 2049 | break; |
| 2050 | case SYS_LISTEN: |
| 2051 | err = sys_listen(a0, a1); |
| 2052 | break; |
| 2053 | case SYS_ACCEPT: |
| 2054 | err = |
| 2055 | sys_accept(a0, (struct sockaddr __user *)a1, |
| 2056 | (int __user *)a[2]); |
| 2057 | break; |
| 2058 | case SYS_GETSOCKNAME: |
| 2059 | err = |
| 2060 | sys_getsockname(a0, (struct sockaddr __user *)a1, |
| 2061 | (int __user *)a[2]); |
| 2062 | break; |
| 2063 | case SYS_GETPEERNAME: |
| 2064 | err = |
| 2065 | sys_getpeername(a0, (struct sockaddr __user *)a1, |
| 2066 | (int __user *)a[2]); |
| 2067 | break; |
| 2068 | case SYS_SOCKETPAIR: |
| 2069 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
| 2070 | break; |
| 2071 | case SYS_SEND: |
| 2072 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); |
| 2073 | break; |
| 2074 | case SYS_SENDTO: |
| 2075 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], |
| 2076 | (struct sockaddr __user *)a[4], a[5]); |
| 2077 | break; |
| 2078 | case SYS_RECV: |
| 2079 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); |
| 2080 | break; |
| 2081 | case SYS_RECVFROM: |
| 2082 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
| 2083 | (struct sockaddr __user *)a[4], |
| 2084 | (int __user *)a[5]); |
| 2085 | break; |
| 2086 | case SYS_SHUTDOWN: |
| 2087 | err = sys_shutdown(a0, a1); |
| 2088 | break; |
| 2089 | case SYS_SETSOCKOPT: |
| 2090 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); |
| 2091 | break; |
| 2092 | case SYS_GETSOCKOPT: |
| 2093 | err = |
| 2094 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
| 2095 | (int __user *)a[4]); |
| 2096 | break; |
| 2097 | case SYS_SENDMSG: |
| 2098 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); |
| 2099 | break; |
| 2100 | case SYS_RECVMSG: |
| 2101 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); |
| 2102 | break; |
| 2103 | default: |
| 2104 | err = -EINVAL; |
| 2105 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | } |
| 2107 | return err; |
| 2108 | } |
| 2109 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2110 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | |
| 2112 | /* |
| 2113 | * This function is called by a protocol handler that wants to |
| 2114 | * advertise its address family, and have it linked into the |
| 2115 | * SOCKET module. |
| 2116 | */ |
| 2117 | |
| 2118 | int sock_register(struct net_proto_family *ops) |
| 2119 | { |
| 2120 | int err; |
| 2121 | |
| 2122 | if (ops->family >= NPROTO) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2123 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
| 2124 | NPROTO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2125 | return -ENOBUFS; |
| 2126 | } |
| 2127 | net_family_write_lock(); |
| 2128 | err = -EEXIST; |
| 2129 | if (net_families[ops->family] == NULL) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2130 | net_families[ops->family] = ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | err = 0; |
| 2132 | } |
| 2133 | net_family_write_unlock(); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2134 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | return err; |
| 2136 | } |
| 2137 | |
| 2138 | /* |
| 2139 | * This function is called by a protocol handler that wants to |
| 2140 | * remove its address family, and have it unlinked from the |
| 2141 | * SOCKET module. |
| 2142 | */ |
| 2143 | |
| 2144 | int sock_unregister(int family) |
| 2145 | { |
| 2146 | if (family < 0 || family >= NPROTO) |
| 2147 | return -1; |
| 2148 | |
| 2149 | net_family_write_lock(); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2150 | net_families[family] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | net_family_write_unlock(); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2152 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | return 0; |
| 2154 | } |
| 2155 | |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2156 | static int __init sock_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | { |
| 2158 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2159 | * Initialize sock SLAB cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | sk_init(); |
| 2163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2165 | * Initialize skbuff SLAB cache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | */ |
| 2167 | skb_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | |
| 2169 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2170 | * Initialize the protocols module. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | */ |
| 2172 | |
| 2173 | init_inodecache(); |
| 2174 | register_filesystem(&sock_fs_type); |
| 2175 | sock_mnt = kern_mount(&sock_fs_type); |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2176 | |
| 2177 | /* The real protocol initialization is performed in later initcalls. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | */ |
| 2179 | |
| 2180 | #ifdef CONFIG_NETFILTER |
| 2181 | netfilter_init(); |
| 2182 | #endif |
David S. Miller | cbeb321 | 2005-12-22 12:58:55 -0800 | [diff] [blame] | 2183 | |
| 2184 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | } |
| 2186 | |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2187 | core_initcall(sock_init); /* early initcall */ |
| 2188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | #ifdef CONFIG_PROC_FS |
| 2190 | void socket_seq_show(struct seq_file *seq) |
| 2191 | { |
| 2192 | int cpu; |
| 2193 | int counter = 0; |
| 2194 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 2195 | for_each_possible_cpu(cpu) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2196 | counter += per_cpu(sockets_in_use, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | |
| 2198 | /* It can be negative, by the way. 8) */ |
| 2199 | if (counter < 0) |
| 2200 | counter = 0; |
| 2201 | |
| 2202 | seq_printf(seq, "sockets: used %d\n", counter); |
| 2203 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2204 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 2206 | #ifdef CONFIG_COMPAT |
| 2207 | static long compat_sock_ioctl(struct file *file, unsigned cmd, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame^] | 2208 | unsigned long arg) |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 2209 | { |
| 2210 | struct socket *sock = file->private_data; |
| 2211 | int ret = -ENOIOCTLCMD; |
| 2212 | |
| 2213 | if (sock->ops->compat_ioctl) |
| 2214 | ret = sock->ops->compat_ioctl(sock, cmd, arg); |
| 2215 | |
| 2216 | return ret; |
| 2217 | } |
| 2218 | #endif |
| 2219 | |
Sridhar Samudrala | ac5a488 | 2006-08-07 20:57:31 -0700 | [diff] [blame] | 2220 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
| 2221 | { |
| 2222 | return sock->ops->bind(sock, addr, addrlen); |
| 2223 | } |
| 2224 | |
| 2225 | int kernel_listen(struct socket *sock, int backlog) |
| 2226 | { |
| 2227 | return sock->ops->listen(sock, backlog); |
| 2228 | } |
| 2229 | |
| 2230 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
| 2231 | { |
| 2232 | struct sock *sk = sock->sk; |
| 2233 | int err; |
| 2234 | |
| 2235 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
| 2236 | newsock); |
| 2237 | if (err < 0) |
| 2238 | goto done; |
| 2239 | |
| 2240 | err = sock->ops->accept(sock, *newsock, flags); |
| 2241 | if (err < 0) { |
| 2242 | sock_release(*newsock); |
| 2243 | goto done; |
| 2244 | } |
| 2245 | |
| 2246 | (*newsock)->ops = sock->ops; |
| 2247 | |
| 2248 | done: |
| 2249 | return err; |
| 2250 | } |
| 2251 | |
| 2252 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
| 2253 | int flags) |
| 2254 | { |
| 2255 | return sock->ops->connect(sock, addr, addrlen, flags); |
| 2256 | } |
| 2257 | |
| 2258 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, |
| 2259 | int *addrlen) |
| 2260 | { |
| 2261 | return sock->ops->getname(sock, addr, addrlen, 0); |
| 2262 | } |
| 2263 | |
| 2264 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, |
| 2265 | int *addrlen) |
| 2266 | { |
| 2267 | return sock->ops->getname(sock, addr, addrlen, 1); |
| 2268 | } |
| 2269 | |
| 2270 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
| 2271 | char *optval, int *optlen) |
| 2272 | { |
| 2273 | mm_segment_t oldfs = get_fs(); |
| 2274 | int err; |
| 2275 | |
| 2276 | set_fs(KERNEL_DS); |
| 2277 | if (level == SOL_SOCKET) |
| 2278 | err = sock_getsockopt(sock, level, optname, optval, optlen); |
| 2279 | else |
| 2280 | err = sock->ops->getsockopt(sock, level, optname, optval, |
| 2281 | optlen); |
| 2282 | set_fs(oldfs); |
| 2283 | return err; |
| 2284 | } |
| 2285 | |
| 2286 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
| 2287 | char *optval, int optlen) |
| 2288 | { |
| 2289 | mm_segment_t oldfs = get_fs(); |
| 2290 | int err; |
| 2291 | |
| 2292 | set_fs(KERNEL_DS); |
| 2293 | if (level == SOL_SOCKET) |
| 2294 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
| 2295 | else |
| 2296 | err = sock->ops->setsockopt(sock, level, optname, optval, |
| 2297 | optlen); |
| 2298 | set_fs(oldfs); |
| 2299 | return err; |
| 2300 | } |
| 2301 | |
| 2302 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
| 2303 | size_t size, int flags) |
| 2304 | { |
| 2305 | if (sock->ops->sendpage) |
| 2306 | return sock->ops->sendpage(sock, page, offset, size, flags); |
| 2307 | |
| 2308 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 2309 | } |
| 2310 | |
| 2311 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) |
| 2312 | { |
| 2313 | mm_segment_t oldfs = get_fs(); |
| 2314 | int err; |
| 2315 | |
| 2316 | set_fs(KERNEL_DS); |
| 2317 | err = sock->ops->ioctl(sock, cmd, arg); |
| 2318 | set_fs(oldfs); |
| 2319 | |
| 2320 | return err; |
| 2321 | } |
| 2322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2323 | /* ABI emulation layers need these two */ |
| 2324 | EXPORT_SYMBOL(move_addr_to_kernel); |
| 2325 | EXPORT_SYMBOL(move_addr_to_user); |
| 2326 | EXPORT_SYMBOL(sock_create); |
| 2327 | EXPORT_SYMBOL(sock_create_kern); |
| 2328 | EXPORT_SYMBOL(sock_create_lite); |
| 2329 | EXPORT_SYMBOL(sock_map_fd); |
| 2330 | EXPORT_SYMBOL(sock_recvmsg); |
| 2331 | EXPORT_SYMBOL(sock_register); |
| 2332 | EXPORT_SYMBOL(sock_release); |
| 2333 | EXPORT_SYMBOL(sock_sendmsg); |
| 2334 | EXPORT_SYMBOL(sock_unregister); |
| 2335 | EXPORT_SYMBOL(sock_wake_async); |
| 2336 | EXPORT_SYMBOL(sockfd_lookup); |
| 2337 | EXPORT_SYMBOL(kernel_sendmsg); |
| 2338 | EXPORT_SYMBOL(kernel_recvmsg); |
Sridhar Samudrala | ac5a488 | 2006-08-07 20:57:31 -0700 | [diff] [blame] | 2339 | EXPORT_SYMBOL(kernel_bind); |
| 2340 | EXPORT_SYMBOL(kernel_listen); |
| 2341 | EXPORT_SYMBOL(kernel_accept); |
| 2342 | EXPORT_SYMBOL(kernel_connect); |
| 2343 | EXPORT_SYMBOL(kernel_getsockname); |
| 2344 | EXPORT_SYMBOL(kernel_getpeername); |
| 2345 | EXPORT_SYMBOL(kernel_getsockopt); |
| 2346 | EXPORT_SYMBOL(kernel_setsockopt); |
| 2347 | EXPORT_SYMBOL(kernel_sendpage); |
| 2348 | EXPORT_SYMBOL(kernel_sock_ioctl); |