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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <linux/socket.h> |
| 63 | #include <linux/file.h> |
| 64 | #include <linux/net.h> |
| 65 | #include <linux/interrupt.h> |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 66 | #include <linux/rcupdate.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <linux/mount.h> |
| 81 | #include <linux/security.h> |
| 82 | #include <linux/syscalls.h> |
| 83 | #include <linux/compat.h> |
| 84 | #include <linux/kmod.h> |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 85 | #include <linux/audit.h> |
Adrian Bunk | d86b5e0 | 2006-01-21 00:46:55 +0100 | [diff] [blame] | 86 | #include <linux/wireless.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | #include <asm/uaccess.h> |
| 89 | #include <asm/unistd.h> |
| 90 | |
| 91 | #include <net/compat.h> |
| 92 | |
| 93 | #include <net/sock.h> |
| 94 | #include <linux/netfilter.h> |
| 95 | |
| 96 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 97 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 98 | unsigned long nr_segs, loff_t pos); |
| 99 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 100 | unsigned long nr_segs, loff_t pos); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 101 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static int sock_close(struct inode *inode, struct file *file); |
| 104 | static unsigned int sock_poll(struct file *file, |
| 105 | struct poll_table_struct *wait); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 106 | 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] | 107 | #ifdef CONFIG_COMPAT |
| 108 | static long compat_sock_ioctl(struct file *file, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 109 | unsigned int cmd, unsigned long arg); |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 110 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | static int sock_fasync(int fd, struct file *filp, int on); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 113 | int offset, size_t size, loff_t *ppos, int more); |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* |
| 116 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
| 117 | * in the operation structures but are done directly via the socketcall() multiplexor. |
| 118 | */ |
| 119 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 120 | static const struct file_operations socket_file_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | .owner = THIS_MODULE, |
| 122 | .llseek = no_llseek, |
| 123 | .aio_read = sock_aio_read, |
| 124 | .aio_write = sock_aio_write, |
| 125 | .poll = sock_poll, |
| 126 | .unlocked_ioctl = sock_ioctl, |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 127 | #ifdef CONFIG_COMPAT |
| 128 | .compat_ioctl = compat_sock_ioctl, |
| 129 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | .mmap = sock_mmap, |
| 131 | .open = sock_no_open, /* special open code to disallow open via /proc */ |
| 132 | .release = sock_close, |
| 133 | .fasync = sock_fasync, |
Jens Axboe | 5274f05 | 2006-03-30 15:15:30 +0200 | [diff] [blame] | 134 | .sendpage = sock_sendpage, |
| 135 | .splice_write = generic_splice_sendpage, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | }; |
| 137 | |
| 138 | /* |
| 139 | * The protocol list. Each protocol is registered in here. |
| 140 | */ |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | static DEFINE_SPINLOCK(net_family_lock); |
Stephen Hemminger | f0fd27d | 2006-08-09 21:03:17 -0700 | [diff] [blame] | 143 | static const struct net_proto_family *net_families[NPROTO] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* |
| 146 | * Statistics counters of the socket lists |
| 147 | */ |
| 148 | |
| 149 | static DEFINE_PER_CPU(int, sockets_in_use) = 0; |
| 150 | |
| 151 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 152 | * Support routines. |
| 153 | * Move socket addresses back and forth across the kernel/user |
| 154 | * divide and look after the messy bits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | */ |
| 156 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 157 | #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | 16 for IP, 16 for IPX, |
| 159 | 24 for IPv6, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 160 | about 80 for AX.25 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | must be at least one bigger than |
| 162 | the AF_UNIX size (see net/unix/af_unix.c |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 163 | :unix_mkname()). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /** |
| 167 | * move_addr_to_kernel - copy a socket address into kernel space |
| 168 | * @uaddr: Address in user space |
| 169 | * @kaddr: Address in kernel space |
| 170 | * @ulen: Length in user space |
| 171 | * |
| 172 | * The address is copied into kernel space. If the provided address is |
| 173 | * too long an error code of -EINVAL is returned. If the copy gives |
| 174 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
| 175 | */ |
| 176 | |
| 177 | int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr) |
| 178 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 179 | if (ulen < 0 || ulen > MAX_SOCK_ADDR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 181 | if (ulen == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | return 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 183 | if (copy_from_user(kaddr, uaddr, ulen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return -EFAULT; |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 185 | return audit_sockaddr(ulen, kaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | /** |
| 189 | * move_addr_to_user - copy an address to user space |
| 190 | * @kaddr: kernel space address |
| 191 | * @klen: length of address in kernel |
| 192 | * @uaddr: user space address |
| 193 | * @ulen: pointer to user length field |
| 194 | * |
| 195 | * The value pointed to by ulen on entry is the buffer length available. |
| 196 | * This is overwritten with the buffer space used. -EINVAL is returned |
| 197 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
| 198 | * is returned if either the buffer or the length field are not |
| 199 | * accessible. |
| 200 | * After copying the data up to the limit the user specifies, the true |
| 201 | * length of the data is written over the length limit the user |
| 202 | * specified. Zero is returned for a success. |
| 203 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 204 | |
| 205 | int move_addr_to_user(void *kaddr, int klen, void __user *uaddr, |
| 206 | int __user *ulen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
| 208 | int err; |
| 209 | int len; |
| 210 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 211 | err = get_user(len, ulen); |
| 212 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return err; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 214 | if (len > klen) |
| 215 | len = klen; |
| 216 | if (len < 0 || len > MAX_SOCK_ADDR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 218 | if (len) { |
Steve Grubb | d6fe394 | 2006-03-30 12:20:22 -0500 | [diff] [blame] | 219 | if (audit_sockaddr(klen, kaddr)) |
| 220 | return -ENOMEM; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 221 | if (copy_to_user(uaddr, kaddr, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | return -EFAULT; |
| 223 | } |
| 224 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 225 | * "fromlen shall refer to the value before truncation.." |
| 226 | * 1003.1g |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | */ |
| 228 | return __put_user(klen, ulen); |
| 229 | } |
| 230 | |
| 231 | #define SOCKFS_MAGIC 0x534F434B |
| 232 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 233 | static struct kmem_cache *sock_inode_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | |
| 235 | static struct inode *sock_alloc_inode(struct super_block *sb) |
| 236 | { |
| 237 | struct socket_alloc *ei; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 238 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 239 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | if (!ei) |
| 241 | return NULL; |
| 242 | init_waitqueue_head(&ei->socket.wait); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | ei->socket.fasync_list = NULL; |
| 245 | ei->socket.state = SS_UNCONNECTED; |
| 246 | ei->socket.flags = 0; |
| 247 | ei->socket.ops = NULL; |
| 248 | ei->socket.sk = NULL; |
| 249 | ei->socket.file = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | return &ei->vfs_inode; |
| 252 | } |
| 253 | |
| 254 | static void sock_destroy_inode(struct inode *inode) |
| 255 | { |
| 256 | kmem_cache_free(sock_inode_cachep, |
| 257 | container_of(inode, struct socket_alloc, vfs_inode)); |
| 258 | } |
| 259 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 260 | static void init_once(void *foo, struct kmem_cache *cachep, unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 262 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 264 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) |
| 265 | == SLAB_CTOR_CONSTRUCTOR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | inode_init_once(&ei->vfs_inode); |
| 267 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | static int init_inodecache(void) |
| 270 | { |
| 271 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 272 | sizeof(struct socket_alloc), |
| 273 | 0, |
| 274 | (SLAB_HWCACHE_ALIGN | |
| 275 | SLAB_RECLAIM_ACCOUNT | |
| 276 | SLAB_MEM_SPREAD), |
| 277 | init_once, |
| 278 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (sock_inode_cachep == NULL) |
| 280 | return -ENOMEM; |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static struct super_operations sockfs_ops = { |
| 285 | .alloc_inode = sock_alloc_inode, |
| 286 | .destroy_inode =sock_destroy_inode, |
| 287 | .statfs = simple_statfs, |
| 288 | }; |
| 289 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 290 | static int sockfs_get_sb(struct file_system_type *fs_type, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 291 | int flags, const char *dev_name, void *data, |
| 292 | struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 294 | return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, |
| 295 | mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
| 297 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 298 | static struct vfsmount *sock_mnt __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | static struct file_system_type sock_fs_type = { |
| 301 | .name = "sockfs", |
| 302 | .get_sb = sockfs_get_sb, |
| 303 | .kill_sb = kill_anon_super, |
| 304 | }; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | static int sockfs_delete_dentry(struct dentry *dentry) |
| 307 | { |
Eric Dumazet | 304e61e | 2006-12-06 20:38:49 -0800 | [diff] [blame] | 308 | /* |
| 309 | * At creation time, we pretended this dentry was hashed |
| 310 | * (by clearing DCACHE_UNHASHED bit in d_flags) |
| 311 | * At delete time, we restore the truth : not hashed. |
| 312 | * (so that dput() can proceed correctly) |
| 313 | */ |
| 314 | dentry->d_flags |= DCACHE_UNHASHED; |
| 315 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | static struct dentry_operations sockfs_dentry_operations = { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 318 | .d_delete = sockfs_delete_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | }; |
| 320 | |
| 321 | /* |
| 322 | * Obtains the first available file descriptor and sets it up for use. |
| 323 | * |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 324 | * These functions create file structures and maps them to fd space |
| 325 | * of the current process. On success it returns file descriptor |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | * and file struct implicitly stored in sock->file. |
| 327 | * Note that another thread may close file descriptor before we return |
| 328 | * from this function. We use the fact that now we do not refer |
| 329 | * to socket after mapping. If one day we will need it, this |
| 330 | * function will increment ref. count on file by 1. |
| 331 | * |
| 332 | * In any case returned fd MAY BE not valid! |
| 333 | * This race condition is unavoidable |
| 334 | * with shared fd spaces, we cannot solve it inside kernel, |
| 335 | * but we take care of internal coherence yet. |
| 336 | */ |
| 337 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 338 | static int sock_alloc_fd(struct file **filep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
| 340 | int fd; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 341 | |
| 342 | fd = get_unused_fd(); |
| 343 | if (likely(fd >= 0)) { |
| 344 | struct file *file = get_empty_filp(); |
| 345 | |
| 346 | *filep = file; |
| 347 | if (unlikely(!file)) { |
| 348 | put_unused_fd(fd); |
| 349 | return -ENFILE; |
| 350 | } |
| 351 | } else |
| 352 | *filep = NULL; |
| 353 | return fd; |
| 354 | } |
| 355 | |
| 356 | static int sock_attach_fd(struct socket *sock, struct file *file) |
| 357 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | struct qstr this; |
| 359 | char name[32]; |
| 360 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 361 | this.len = sprintf(name, "[%lu]", SOCK_INODE(sock)->i_ino); |
| 362 | this.name = name; |
Eric Dumazet | 304e61e | 2006-12-06 20:38:49 -0800 | [diff] [blame] | 363 | this.hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
Josef Sipek | 3126a42 | 2006-12-08 02:37:23 -0800 | [diff] [blame] | 365 | file->f_path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &this); |
| 366 | if (unlikely(!file->f_path.dentry)) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 367 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Josef Sipek | 3126a42 | 2006-12-08 02:37:23 -0800 | [diff] [blame] | 369 | file->f_path.dentry->d_op = &sockfs_dentry_operations; |
Eric Dumazet | 304e61e | 2006-12-06 20:38:49 -0800 | [diff] [blame] | 370 | /* |
| 371 | * We dont want to push this dentry into global dentry hash table. |
| 372 | * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED |
| 373 | * This permits a working /proc/$pid/fd/XXX on sockets |
| 374 | */ |
Josef Sipek | 3126a42 | 2006-12-08 02:37:23 -0800 | [diff] [blame] | 375 | file->f_path.dentry->d_flags &= ~DCACHE_UNHASHED; |
| 376 | d_instantiate(file->f_path.dentry, SOCK_INODE(sock)); |
| 377 | file->f_path.mnt = mntget(sock_mnt); |
| 378 | file->f_mapping = file->f_path.dentry->d_inode->i_mapping; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 379 | |
| 380 | sock->file = file; |
| 381 | file->f_op = SOCK_INODE(sock)->i_fop = &socket_file_ops; |
| 382 | file->f_mode = FMODE_READ | FMODE_WRITE; |
| 383 | file->f_flags = O_RDWR; |
| 384 | file->f_pos = 0; |
| 385 | file->private_data = sock; |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | int sock_map_fd(struct socket *sock) |
| 391 | { |
| 392 | struct file *newfile; |
| 393 | int fd = sock_alloc_fd(&newfile); |
| 394 | |
| 395 | if (likely(fd >= 0)) { |
| 396 | int err = sock_attach_fd(sock, newfile); |
| 397 | |
| 398 | if (unlikely(err < 0)) { |
| 399 | put_filp(newfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | put_unused_fd(fd); |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 401 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 403 | fd_install(fd, newfile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | return fd; |
| 406 | } |
| 407 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 408 | static struct socket *sock_from_file(struct file *file, int *err) |
| 409 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 410 | if (file->f_op == &socket_file_ops) |
| 411 | return file->private_data; /* set in sock_map_fd */ |
| 412 | |
Eric Dumazet | 23bb80d | 2007-02-08 14:59:57 -0800 | [diff] [blame] | 413 | *err = -ENOTSOCK; |
| 414 | return NULL; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 415 | } |
| 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | /** |
| 418 | * sockfd_lookup - Go from a file number to its socket slot |
| 419 | * @fd: file handle |
| 420 | * @err: pointer to an error code return |
| 421 | * |
| 422 | * The file handle passed in is locked and the socket it is bound |
| 423 | * too is returned. If an error occurs the err pointer is overwritten |
| 424 | * with a negative errno code and NULL is returned. The function checks |
| 425 | * for both invalid handles and passing a handle which is not a socket. |
| 426 | * |
| 427 | * On a success the socket object pointer is returned. |
| 428 | */ |
| 429 | |
| 430 | struct socket *sockfd_lookup(int fd, int *err) |
| 431 | { |
| 432 | struct file *file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | struct socket *sock; |
| 434 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 435 | file = fget(fd); |
| 436 | if (!file) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | *err = -EBADF; |
| 438 | return NULL; |
| 439 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 440 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 441 | sock = sock_from_file(file, err); |
| 442 | if (!sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | fput(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | return sock; |
| 445 | } |
| 446 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 447 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
| 448 | { |
| 449 | struct file *file; |
| 450 | struct socket *sock; |
| 451 | |
Hua Zhong | 3672558 | 2006-04-19 15:25:02 -0700 | [diff] [blame] | 452 | *err = -EBADF; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 453 | file = fget_light(fd, fput_needed); |
| 454 | if (file) { |
| 455 | sock = sock_from_file(file, err); |
| 456 | if (sock) |
| 457 | return sock; |
| 458 | fput_light(file, *fput_needed); |
| 459 | } |
| 460 | return NULL; |
| 461 | } |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /** |
| 464 | * sock_alloc - allocate a socket |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 465 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | * Allocate a new inode and socket object. The two are bound together |
| 467 | * and initialised. The socket is then returned. If we are out of inodes |
| 468 | * NULL is returned. |
| 469 | */ |
| 470 | |
| 471 | static struct socket *sock_alloc(void) |
| 472 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 473 | struct inode *inode; |
| 474 | struct socket *sock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | inode = new_inode(sock_mnt->mnt_sb); |
| 477 | if (!inode) |
| 478 | return NULL; |
| 479 | |
| 480 | sock = SOCKET_I(inode); |
| 481 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 482 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | inode->i_uid = current->fsuid; |
| 484 | inode->i_gid = current->fsgid; |
| 485 | |
| 486 | get_cpu_var(sockets_in_use)++; |
| 487 | put_cpu_var(sockets_in_use); |
| 488 | return sock; |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * In theory you can't get an open on this inode, but /proc provides |
| 493 | * a back door. Remember to keep it shut otherwise you'll let the |
| 494 | * creepy crawlies in. |
| 495 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | static int sock_no_open(struct inode *irrelevant, struct file *dontcare) |
| 498 | { |
| 499 | return -ENXIO; |
| 500 | } |
| 501 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 502 | const struct file_operations bad_sock_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | .owner = THIS_MODULE, |
| 504 | .open = sock_no_open, |
| 505 | }; |
| 506 | |
| 507 | /** |
| 508 | * sock_release - close a socket |
| 509 | * @sock: socket to close |
| 510 | * |
| 511 | * The socket is released from the protocol stack if it has a release |
| 512 | * 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] | 513 | * an inode not a file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | void sock_release(struct socket *sock) |
| 517 | { |
| 518 | if (sock->ops) { |
| 519 | struct module *owner = sock->ops->owner; |
| 520 | |
| 521 | sock->ops->release(sock); |
| 522 | sock->ops = NULL; |
| 523 | module_put(owner); |
| 524 | } |
| 525 | |
| 526 | if (sock->fasync_list) |
| 527 | printk(KERN_ERR "sock_release: fasync list not empty!\n"); |
| 528 | |
| 529 | get_cpu_var(sockets_in_use)--; |
| 530 | put_cpu_var(sockets_in_use); |
| 531 | if (!sock->file) { |
| 532 | iput(SOCK_INODE(sock)); |
| 533 | return; |
| 534 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 535 | sock->file = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 538 | static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | struct msghdr *msg, size_t size) |
| 540 | { |
| 541 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
| 542 | int err; |
| 543 | |
| 544 | si->sock = sock; |
| 545 | si->scm = NULL; |
| 546 | si->msg = msg; |
| 547 | si->size = size; |
| 548 | |
| 549 | err = security_socket_sendmsg(sock, msg, size); |
| 550 | if (err) |
| 551 | return err; |
| 552 | |
| 553 | return sock->ops->sendmsg(iocb, sock, msg, size); |
| 554 | } |
| 555 | |
| 556 | int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
| 557 | { |
| 558 | struct kiocb iocb; |
| 559 | struct sock_iocb siocb; |
| 560 | int ret; |
| 561 | |
| 562 | init_sync_kiocb(&iocb, NULL); |
| 563 | iocb.private = &siocb; |
| 564 | ret = __sock_sendmsg(&iocb, sock, msg, size); |
| 565 | if (-EIOCBQUEUED == ret) |
| 566 | ret = wait_on_sync_kiocb(&iocb); |
| 567 | return ret; |
| 568 | } |
| 569 | |
| 570 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
| 571 | struct kvec *vec, size_t num, size_t size) |
| 572 | { |
| 573 | mm_segment_t oldfs = get_fs(); |
| 574 | int result; |
| 575 | |
| 576 | set_fs(KERNEL_DS); |
| 577 | /* |
| 578 | * the following is safe, since for compiler definitions of kvec and |
| 579 | * iovec are identical, yielding the same in-core layout and alignment |
| 580 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 581 | msg->msg_iov = (struct iovec *)vec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | msg->msg_iovlen = num; |
| 583 | result = sock_sendmsg(sock, msg, size); |
| 584 | set_fs(oldfs); |
| 585 | return result; |
| 586 | } |
| 587 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 588 | static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | struct msghdr *msg, size_t size, int flags) |
| 590 | { |
| 591 | int err; |
| 592 | struct sock_iocb *si = kiocb_to_siocb(iocb); |
| 593 | |
| 594 | si->sock = sock; |
| 595 | si->scm = NULL; |
| 596 | si->msg = msg; |
| 597 | si->size = size; |
| 598 | si->flags = flags; |
| 599 | |
| 600 | err = security_socket_recvmsg(sock, msg, size, flags); |
| 601 | if (err) |
| 602 | return err; |
| 603 | |
| 604 | return sock->ops->recvmsg(iocb, sock, msg, size, flags); |
| 605 | } |
| 606 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 607 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | size_t size, int flags) |
| 609 | { |
| 610 | struct kiocb iocb; |
| 611 | struct sock_iocb siocb; |
| 612 | int ret; |
| 613 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 614 | init_sync_kiocb(&iocb, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | iocb.private = &siocb; |
| 616 | ret = __sock_recvmsg(&iocb, sock, msg, size, flags); |
| 617 | if (-EIOCBQUEUED == ret) |
| 618 | ret = wait_on_sync_kiocb(&iocb); |
| 619 | return ret; |
| 620 | } |
| 621 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 622 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
| 623 | struct kvec *vec, size_t num, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
| 625 | mm_segment_t oldfs = get_fs(); |
| 626 | int result; |
| 627 | |
| 628 | set_fs(KERNEL_DS); |
| 629 | /* |
| 630 | * the following is safe, since for compiler definitions of kvec and |
| 631 | * iovec are identical, yielding the same in-core layout and alignment |
| 632 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 633 | msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | result = sock_recvmsg(sock, msg, size, flags); |
| 635 | set_fs(oldfs); |
| 636 | return result; |
| 637 | } |
| 638 | |
| 639 | static void sock_aio_dtor(struct kiocb *iocb) |
| 640 | { |
| 641 | kfree(iocb->private); |
| 642 | } |
| 643 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 644 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 645 | int offset, size_t size, loff_t *ppos, int more) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
| 647 | struct socket *sock; |
| 648 | int flags; |
| 649 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 650 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; |
| 653 | if (more) |
| 654 | flags |= MSG_MORE; |
| 655 | |
| 656 | return sock->ops->sendpage(sock, page, offset, size, flags); |
| 657 | } |
| 658 | |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 659 | static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 660 | struct sock_iocb *siocb) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 661 | { |
| 662 | if (!is_sync_kiocb(iocb)) { |
| 663 | siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); |
| 664 | if (!siocb) |
| 665 | return NULL; |
| 666 | iocb->ki_dtor = sock_aio_dtor; |
| 667 | } |
| 668 | |
| 669 | siocb->kiocb = iocb; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 670 | iocb->private = siocb; |
| 671 | return siocb; |
| 672 | } |
| 673 | |
| 674 | static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 675 | struct file *file, const struct iovec *iov, |
| 676 | unsigned long nr_segs) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 677 | { |
| 678 | struct socket *sock = file->private_data; |
| 679 | size_t size = 0; |
| 680 | int i; |
| 681 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 682 | for (i = 0; i < nr_segs; i++) |
| 683 | size += iov[i].iov_len; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 684 | |
| 685 | msg->msg_name = NULL; |
| 686 | msg->msg_namelen = 0; |
| 687 | msg->msg_control = NULL; |
| 688 | msg->msg_controllen = 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 689 | msg->msg_iov = (struct iovec *)iov; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 690 | msg->msg_iovlen = nr_segs; |
| 691 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| 692 | |
| 693 | return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); |
| 694 | } |
| 695 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 696 | static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, |
| 697 | unsigned long nr_segs, loff_t pos) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 698 | { |
| 699 | struct sock_iocb siocb, *x; |
| 700 | |
| 701 | if (pos != 0) |
| 702 | return -ESPIPE; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 703 | |
| 704 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 705 | return 0; |
| 706 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 707 | |
| 708 | x = alloc_sock_iocb(iocb, &siocb); |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 709 | if (!x) |
| 710 | return -ENOMEM; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 711 | return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 712 | } |
| 713 | |
| 714 | static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 715 | struct file *file, const struct iovec *iov, |
| 716 | unsigned long nr_segs) |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 717 | { |
| 718 | struct socket *sock = file->private_data; |
| 719 | size_t size = 0; |
| 720 | int i; |
| 721 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 722 | for (i = 0; i < nr_segs; i++) |
| 723 | size += iov[i].iov_len; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 724 | |
| 725 | msg->msg_name = NULL; |
| 726 | msg->msg_namelen = 0; |
| 727 | msg->msg_control = NULL; |
| 728 | msg->msg_controllen = 0; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 729 | msg->msg_iov = (struct iovec *)iov; |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 730 | msg->msg_iovlen = nr_segs; |
| 731 | msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| 732 | if (sock->type == SOCK_SEQPACKET) |
| 733 | msg->msg_flags |= MSG_EOR; |
| 734 | |
| 735 | return __sock_sendmsg(iocb, sock, msg, size); |
| 736 | } |
| 737 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 738 | static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| 739 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 741 | struct sock_iocb siocb, *x; |
| 742 | |
| 743 | if (pos != 0) |
| 744 | return -ESPIPE; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 745 | |
| 746 | if (iocb->ki_left == 0) /* Match SYS5 behaviour */ |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 747 | return 0; |
| 748 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 749 | x = alloc_sock_iocb(iocb, &siocb); |
Christoph Hellwig | ce1d4d3 | 2005-12-22 21:08:46 -0800 | [diff] [blame] | 750 | if (!x) |
| 751 | return -ENOMEM; |
| 752 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 753 | return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | /* |
| 757 | * Atomic setting of ioctl hooks to avoid race |
| 758 | * with module unload. |
| 759 | */ |
| 760 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 761 | static DEFINE_MUTEX(br_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 762 | static int (*br_ioctl_hook) (unsigned int cmd, void __user *arg) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 764 | void brioctl_set(int (*hook) (unsigned int, void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 766 | mutex_lock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | br_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 768 | mutex_unlock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 770 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | EXPORT_SYMBOL(brioctl_set); |
| 772 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 773 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 774 | static int (*vlan_ioctl_hook) (void __user *arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 776 | void vlan_ioctl_set(int (*hook) (void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 778 | mutex_lock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | vlan_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 780 | mutex_unlock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | EXPORT_SYMBOL(vlan_ioctl_set); |
| 784 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 785 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 786 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 788 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 790 | mutex_lock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | dlci_ioctl_hook = hook; |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 792 | mutex_unlock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | EXPORT_SYMBOL(dlci_ioctl_set); |
| 796 | |
| 797 | /* |
| 798 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
| 799 | * what to do with it - that's up to the protocol still. |
| 800 | */ |
| 801 | |
| 802 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 803 | { |
| 804 | struct socket *sock; |
| 805 | void __user *argp = (void __user *)arg; |
| 806 | int pid, err; |
| 807 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 808 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { |
| 810 | err = dev_ioctl(cmd, argp); |
| 811 | } else |
Adrian Bunk | d86b5e0 | 2006-01-21 00:46:55 +0100 | [diff] [blame] | 812 | #ifdef CONFIG_WIRELESS_EXT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
| 814 | err = dev_ioctl(cmd, argp); |
| 815 | } else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 816 | #endif /* CONFIG_WIRELESS_EXT */ |
| 817 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | case FIOSETOWN: |
| 819 | case SIOCSPGRP: |
| 820 | err = -EFAULT; |
| 821 | if (get_user(pid, (int __user *)argp)) |
| 822 | break; |
| 823 | err = f_setown(sock->file, pid, 1); |
| 824 | break; |
| 825 | case FIOGETOWN: |
| 826 | case SIOCGPGRP: |
Eric W. Biederman | 609d7fa | 2006-10-02 02:17:15 -0700 | [diff] [blame] | 827 | err = put_user(f_getown(sock->file), |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 828 | (int __user *)argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | break; |
| 830 | case SIOCGIFBR: |
| 831 | case SIOCSIFBR: |
| 832 | case SIOCBRADDBR: |
| 833 | case SIOCBRDELBR: |
| 834 | err = -ENOPKG; |
| 835 | if (!br_ioctl_hook) |
| 836 | request_module("bridge"); |
| 837 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 838 | mutex_lock(&br_ioctl_mutex); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 839 | if (br_ioctl_hook) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | err = br_ioctl_hook(cmd, argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 841 | mutex_unlock(&br_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | break; |
| 843 | case SIOCGIFVLAN: |
| 844 | case SIOCSIFVLAN: |
| 845 | err = -ENOPKG; |
| 846 | if (!vlan_ioctl_hook) |
| 847 | request_module("8021q"); |
| 848 | |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 849 | mutex_lock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | if (vlan_ioctl_hook) |
| 851 | err = vlan_ioctl_hook(argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 852 | mutex_unlock(&vlan_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | case SIOCADDDLCI: |
| 855 | case SIOCDELDLCI: |
| 856 | err = -ENOPKG; |
| 857 | if (!dlci_ioctl_hook) |
| 858 | request_module("dlci"); |
| 859 | |
| 860 | if (dlci_ioctl_hook) { |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 861 | mutex_lock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | err = dlci_ioctl_hook(cmd, argp); |
Arjan van de Ven | 4a3e2f7 | 2006-03-20 22:33:17 -0800 | [diff] [blame] | 863 | mutex_unlock(&dlci_ioctl_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | break; |
| 866 | default: |
| 867 | err = sock->ops->ioctl(sock, cmd, arg); |
Christoph Hellwig | b5e5fa5 | 2006-01-03 14:18:33 -0800 | [diff] [blame] | 868 | |
| 869 | /* |
| 870 | * If this ioctl is unknown try to hand it down |
| 871 | * to the NIC driver. |
| 872 | */ |
| 873 | if (err == -ENOIOCTLCMD) |
| 874 | err = dev_ioctl(cmd, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | break; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 876 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | return err; |
| 878 | } |
| 879 | |
| 880 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
| 881 | { |
| 882 | int err; |
| 883 | struct socket *sock = NULL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | err = security_socket_create(family, type, protocol, 1); |
| 886 | if (err) |
| 887 | goto out; |
| 888 | |
| 889 | sock = sock_alloc(); |
| 890 | if (!sock) { |
| 891 | err = -ENOMEM; |
| 892 | goto out; |
| 893 | } |
| 894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | sock->type = type; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 896 | err = security_socket_post_create(sock, family, type, protocol, 1); |
| 897 | if (err) |
| 898 | goto out_release; |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | out: |
| 901 | *res = sock; |
| 902 | return err; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 903 | out_release: |
| 904 | sock_release(sock); |
| 905 | sock = NULL; |
| 906 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | /* No kernel lock held - perfect */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 910 | static unsigned int sock_poll(struct file *file, poll_table *wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | { |
| 912 | struct socket *sock; |
| 913 | |
| 914 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 915 | * 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] | 916 | */ |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 917 | sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | return sock->ops->poll(file, sock, wait); |
| 919 | } |
| 920 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 921 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | { |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 923 | struct socket *sock = file->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | return sock->ops->mmap(file, sock, vma); |
| 926 | } |
| 927 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 928 | static int sock_close(struct inode *inode, struct file *filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | { |
| 930 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 931 | * It was possible the inode is NULL we were |
| 932 | * closing an unfinished socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | */ |
| 934 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 935 | if (!inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | printk(KERN_DEBUG "sock_close: NULL inode\n"); |
| 937 | return 0; |
| 938 | } |
| 939 | sock_fasync(-1, filp, 0); |
| 940 | sock_release(SOCKET_I(inode)); |
| 941 | return 0; |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * Update the socket async list |
| 946 | * |
| 947 | * Fasync_list locking strategy. |
| 948 | * |
| 949 | * 1. fasync_list is modified only under process context socket lock |
| 950 | * i.e. under semaphore. |
| 951 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
| 952 | * or under socket lock. |
| 953 | * 3. fasync_list can be used from softirq context, so that |
| 954 | * modification under socket lock have to be enhanced with |
| 955 | * write_lock_bh(&sk->sk_callback_lock). |
| 956 | * --ANK (990710) |
| 957 | */ |
| 958 | |
| 959 | static int sock_fasync(int fd, struct file *filp, int on) |
| 960 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 961 | struct fasync_struct *fa, *fna = NULL, **prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | struct socket *sock; |
| 963 | struct sock *sk; |
| 964 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 965 | if (on) { |
Kris Katterjohn | 8b3a700 | 2006-01-11 15:56:43 -0800 | [diff] [blame] | 966 | fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 967 | if (fna == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | return -ENOMEM; |
| 969 | } |
| 970 | |
Eric Dumazet | b69aee0 | 2005-09-06 14:42:45 -0700 | [diff] [blame] | 971 | sock = filp->private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 973 | sk = sock->sk; |
| 974 | if (sk == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | kfree(fna); |
| 976 | return -EINVAL; |
| 977 | } |
| 978 | |
| 979 | lock_sock(sk); |
| 980 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 981 | prev = &(sock->fasync_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 983 | for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) |
| 984 | if (fa->fa_file == filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | break; |
| 986 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 987 | if (on) { |
| 988 | if (fa != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 990 | fa->fa_fd = fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | write_unlock_bh(&sk->sk_callback_lock); |
| 992 | |
| 993 | kfree(fna); |
| 994 | goto out; |
| 995 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 996 | fna->fa_file = filp; |
| 997 | fna->fa_fd = fd; |
| 998 | fna->magic = FASYNC_MAGIC; |
| 999 | fna->fa_next = sock->fasync_list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1001 | sock->fasync_list = fna; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | write_unlock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1003 | } else { |
| 1004 | if (fa != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | write_lock_bh(&sk->sk_callback_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1006 | *prev = fa->fa_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | write_unlock_bh(&sk->sk_callback_lock); |
| 1008 | kfree(fa); |
| 1009 | } |
| 1010 | } |
| 1011 | |
| 1012 | out: |
| 1013 | release_sock(sock->sk); |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | /* This function may be called only under socket lock or callback_lock */ |
| 1018 | |
| 1019 | int sock_wake_async(struct socket *sock, int how, int band) |
| 1020 | { |
| 1021 | if (!sock || !sock->fasync_list) |
| 1022 | return -1; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1023 | switch (how) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | case 1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) |
| 1027 | break; |
| 1028 | goto call_kill; |
| 1029 | case 2: |
| 1030 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) |
| 1031 | break; |
| 1032 | /* fall through */ |
| 1033 | case 0: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1034 | call_kill: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | __kill_fasync(sock->fasync_list, SIGIO, band); |
| 1036 | break; |
| 1037 | case 3: |
| 1038 | __kill_fasync(sock->fasync_list, SIGURG, band); |
| 1039 | } |
| 1040 | return 0; |
| 1041 | } |
| 1042 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1043 | static int __sock_create(int family, int type, int protocol, |
| 1044 | struct socket **res, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | { |
| 1046 | int err; |
| 1047 | struct socket *sock; |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1048 | const struct net_proto_family *pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | |
| 1050 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1051 | * Check protocol is in range |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | */ |
| 1053 | if (family < 0 || family >= NPROTO) |
| 1054 | return -EAFNOSUPPORT; |
| 1055 | if (type < 0 || type >= SOCK_MAX) |
| 1056 | return -EINVAL; |
| 1057 | |
| 1058 | /* Compatibility. |
| 1059 | |
| 1060 | This uglymoron is moved from INET layer to here to avoid |
| 1061 | deadlock in module load. |
| 1062 | */ |
| 1063 | if (family == PF_INET && type == SOCK_PACKET) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1064 | static int warned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | if (!warned) { |
| 1066 | warned = 1; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1067 | printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
| 1068 | current->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | } |
| 1070 | family = PF_PACKET; |
| 1071 | } |
| 1072 | |
| 1073 | err = security_socket_create(family, type, protocol, kern); |
| 1074 | if (err) |
| 1075 | return err; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1076 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1077 | /* |
| 1078 | * Allocate the socket and allow the family to set things up. if |
| 1079 | * the protocol is 0, the family is instructed to select an appropriate |
| 1080 | * default. |
| 1081 | */ |
| 1082 | sock = sock_alloc(); |
| 1083 | if (!sock) { |
| 1084 | if (net_ratelimit()) |
| 1085 | printk(KERN_WARNING "socket: no more sockets\n"); |
| 1086 | return -ENFILE; /* Not exactly a match, but its the |
| 1087 | closest posix thing */ |
| 1088 | } |
| 1089 | |
| 1090 | sock->type = type; |
| 1091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | #if defined(CONFIG_KMOD) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1093 | /* Attempt to load a protocol module if the find failed. |
| 1094 | * |
| 1095 | * 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] | 1096 | * requested real, full-featured networking support upon configuration. |
| 1097 | * Otherwise module support will break! |
| 1098 | */ |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1099 | if (net_families[family] == NULL) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1100 | request_module("net-pf-%d", family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | #endif |
| 1102 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1103 | rcu_read_lock(); |
| 1104 | pf = rcu_dereference(net_families[family]); |
| 1105 | err = -EAFNOSUPPORT; |
| 1106 | if (!pf) |
| 1107 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
| 1109 | /* |
| 1110 | * We will call the ->create function, that possibly is in a loadable |
| 1111 | * module, so we have to bump that loadable module refcnt first. |
| 1112 | */ |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1113 | if (!try_module_get(pf->owner)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | goto out_release; |
| 1115 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1116 | /* Now protected by module ref count */ |
| 1117 | rcu_read_unlock(); |
| 1118 | |
| 1119 | err = pf->create(sock, protocol); |
| 1120 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | goto out_module_put; |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | /* |
| 1124 | * Now to bump the refcnt of the [loadable] module that owns this |
| 1125 | * socket at sock_release time we decrement its refcnt. |
| 1126 | */ |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1127 | if (!try_module_get(sock->ops->owner)) |
| 1128 | goto out_module_busy; |
| 1129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | /* |
| 1131 | * Now that we're done with the ->create function, the [loadable] |
| 1132 | * module can have its refcnt decremented |
| 1133 | */ |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1134 | module_put(pf->owner); |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 1135 | err = security_socket_post_create(sock, family, type, protocol, kern); |
| 1136 | if (err) |
| 1137 | goto out_release; |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1138 | *res = sock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1140 | return 0; |
| 1141 | |
| 1142 | out_module_busy: |
| 1143 | err = -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | out_module_put: |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1145 | sock->ops = NULL; |
| 1146 | module_put(pf->owner); |
| 1147 | out_sock_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | sock_release(sock); |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 1149 | return err; |
| 1150 | |
| 1151 | out_release: |
| 1152 | rcu_read_unlock(); |
| 1153 | goto out_sock_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | int sock_create(int family, int type, int protocol, struct socket **res) |
| 1157 | { |
| 1158 | return __sock_create(family, type, protocol, res, 0); |
| 1159 | } |
| 1160 | |
| 1161 | int sock_create_kern(int family, int type, int protocol, struct socket **res) |
| 1162 | { |
| 1163 | return __sock_create(family, type, protocol, res, 1); |
| 1164 | } |
| 1165 | |
| 1166 | asmlinkage long sys_socket(int family, int type, int protocol) |
| 1167 | { |
| 1168 | int retval; |
| 1169 | struct socket *sock; |
| 1170 | |
| 1171 | retval = sock_create(family, type, protocol, &sock); |
| 1172 | if (retval < 0) |
| 1173 | goto out; |
| 1174 | |
| 1175 | retval = sock_map_fd(sock); |
| 1176 | if (retval < 0) |
| 1177 | goto out_release; |
| 1178 | |
| 1179 | out: |
| 1180 | /* It may be already another descriptor 8) Not kernel problem. */ |
| 1181 | return retval; |
| 1182 | |
| 1183 | out_release: |
| 1184 | sock_release(sock); |
| 1185 | return retval; |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * Create a pair of connected sockets. |
| 1190 | */ |
| 1191 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1192 | asmlinkage long sys_socketpair(int family, int type, int protocol, |
| 1193 | int __user *usockvec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | { |
| 1195 | struct socket *sock1, *sock2; |
| 1196 | int fd1, fd2, err; |
| 1197 | |
| 1198 | /* |
| 1199 | * Obtain the first socket and check if the underlying protocol |
| 1200 | * supports the socketpair call. |
| 1201 | */ |
| 1202 | |
| 1203 | err = sock_create(family, type, protocol, &sock1); |
| 1204 | if (err < 0) |
| 1205 | goto out; |
| 1206 | |
| 1207 | err = sock_create(family, type, protocol, &sock2); |
| 1208 | if (err < 0) |
| 1209 | goto out_release_1; |
| 1210 | |
| 1211 | err = sock1->ops->socketpair(sock1, sock2); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1212 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | goto out_release_both; |
| 1214 | |
| 1215 | fd1 = fd2 = -1; |
| 1216 | |
| 1217 | err = sock_map_fd(sock1); |
| 1218 | if (err < 0) |
| 1219 | goto out_release_both; |
| 1220 | fd1 = err; |
| 1221 | |
| 1222 | err = sock_map_fd(sock2); |
| 1223 | if (err < 0) |
| 1224 | goto out_close_1; |
| 1225 | fd2 = err; |
| 1226 | |
| 1227 | /* fd1 and fd2 may be already another descriptors. |
| 1228 | * Not kernel problem. |
| 1229 | */ |
| 1230 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1231 | err = put_user(fd1, &usockvec[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | if (!err) |
| 1233 | err = put_user(fd2, &usockvec[1]); |
| 1234 | if (!err) |
| 1235 | return 0; |
| 1236 | |
| 1237 | sys_close(fd2); |
| 1238 | sys_close(fd1); |
| 1239 | return err; |
| 1240 | |
| 1241 | out_close_1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1242 | sock_release(sock2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | sys_close(fd1); |
| 1244 | return err; |
| 1245 | |
| 1246 | out_release_both: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1247 | sock_release(sock2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | out_release_1: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1249 | sock_release(sock1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | out: |
| 1251 | return err; |
| 1252 | } |
| 1253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | /* |
| 1255 | * Bind a name to a socket. Nothing much to do here since it's |
| 1256 | * the protocol's responsibility to handle the local address. |
| 1257 | * |
| 1258 | * We move the socket address to kernel space before we call |
| 1259 | * the protocol layer (having also checked the address is ok). |
| 1260 | */ |
| 1261 | |
| 1262 | asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
| 1263 | { |
| 1264 | struct socket *sock; |
| 1265 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1266 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1268 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1269 | if(sock) { |
| 1270 | err = move_addr_to_kernel(umyaddr, addrlen, address); |
| 1271 | if (err >= 0) { |
| 1272 | err = security_socket_bind(sock, |
| 1273 | (struct sockaddr *)address, |
| 1274 | addrlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1275 | if (!err) |
| 1276 | err = sock->ops->bind(sock, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1277 | (struct sockaddr *) |
| 1278 | address, addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1280 | fput_light(sock->file, fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | return err; |
| 1283 | } |
| 1284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | /* |
| 1286 | * Perform a listen. Basically, we allow the protocol to do anything |
| 1287 | * necessary for a listen, and if that works, we mark the socket as |
| 1288 | * ready for listening. |
| 1289 | */ |
| 1290 | |
Brian Haley | 7a42c21 | 2006-08-31 15:03:02 -0700 | [diff] [blame] | 1291 | int sysctl_somaxconn __read_mostly = SOMAXCONN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
| 1293 | asmlinkage long sys_listen(int fd, int backlog) |
| 1294 | { |
| 1295 | struct socket *sock; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1296 | int err, fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1297 | |
| 1298 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1299 | if (sock) { |
| 1300 | if ((unsigned)backlog > sysctl_somaxconn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | backlog = sysctl_somaxconn; |
| 1302 | |
| 1303 | err = security_socket_listen(sock, backlog); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1304 | if (!err) |
| 1305 | err = sock->ops->listen(sock, backlog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1307 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | } |
| 1309 | return err; |
| 1310 | } |
| 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | /* |
| 1313 | * For accept, we attempt to create a new socket, set up the link |
| 1314 | * with the client, wake up the client, then return the new |
| 1315 | * connected fd. We collect the address of the connector in kernel |
| 1316 | * space and move it to user at the very end. This is unclean because |
| 1317 | * we open the socket then return an error. |
| 1318 | * |
| 1319 | * 1003.1g adds the ability to recvmsg() to query connection pending |
| 1320 | * status to recvmsg. We need to add that support in a way thats |
| 1321 | * clean when we restucture accept also. |
| 1322 | */ |
| 1323 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1324 | asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr, |
| 1325 | int __user *upeer_addrlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | { |
| 1327 | struct socket *sock, *newsock; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1328 | struct file *newfile; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1329 | int err, len, newfd, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | char address[MAX_SOCK_ADDR]; |
| 1331 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1332 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | if (!sock) |
| 1334 | goto out; |
| 1335 | |
| 1336 | err = -ENFILE; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1337 | if (!(newsock = sock_alloc())) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | goto out_put; |
| 1339 | |
| 1340 | newsock->type = sock->type; |
| 1341 | newsock->ops = sock->ops; |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | /* |
| 1344 | * We don't need try_module_get here, as the listening socket (sock) |
| 1345 | * has the protocol module (sock->ops->owner) held. |
| 1346 | */ |
| 1347 | __module_get(newsock->ops->owner); |
| 1348 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1349 | newfd = sock_alloc_fd(&newfile); |
| 1350 | if (unlikely(newfd < 0)) { |
| 1351 | err = newfd; |
David S. Miller | 9a1875e | 2006-04-01 12:48:36 -0800 | [diff] [blame] | 1352 | sock_release(newsock); |
| 1353 | goto out_put; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1354 | } |
| 1355 | |
| 1356 | err = sock_attach_fd(newsock, newfile); |
| 1357 | if (err < 0) |
| 1358 | goto out_fd; |
| 1359 | |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1360 | err = security_socket_accept(sock, newsock); |
| 1361 | if (err) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1362 | goto out_fd; |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 1363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | err = sock->ops->accept(sock, newsock, sock->file->f_flags); |
| 1365 | if (err < 0) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1366 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
| 1368 | if (upeer_sockaddr) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1369 | if (newsock->ops->getname(newsock, (struct sockaddr *)address, |
| 1370 | &len, 2) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | err = -ECONNABORTED; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1372 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1374 | err = move_addr_to_user(address, len, upeer_sockaddr, |
| 1375 | upeer_addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | if (err < 0) |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1377 | goto out_fd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | } |
| 1379 | |
| 1380 | /* File flags are not inherited via accept() unlike another OSes. */ |
| 1381 | |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1382 | fd_install(newfd, newfile); |
| 1383 | err = newfd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
| 1385 | security_socket_post_accept(sock, newsock); |
| 1386 | |
| 1387 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1388 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | out: |
| 1390 | return err; |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1391 | out_fd: |
David S. Miller | 9606a21 | 2006-04-01 01:00:14 -0800 | [diff] [blame] | 1392 | fput(newfile); |
David S. Miller | 39d8c1b | 2006-03-20 17:13:49 -0800 | [diff] [blame] | 1393 | put_unused_fd(newfd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | goto out_put; |
| 1395 | } |
| 1396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | /* |
| 1398 | * Attempt to connect to a socket with the server address. The address |
| 1399 | * is in user space so we verify it is OK and move it to kernel space. |
| 1400 | * |
| 1401 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
| 1402 | * break bindings |
| 1403 | * |
| 1404 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
| 1405 | * other SEQPACKET protocols that take time to connect() as it doesn't |
| 1406 | * include the -EINPROGRESS status for such sockets. |
| 1407 | */ |
| 1408 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1409 | asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr, |
| 1410 | int addrlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | { |
| 1412 | struct socket *sock; |
| 1413 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1414 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1416 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | if (!sock) |
| 1418 | goto out; |
| 1419 | err = move_addr_to_kernel(uservaddr, addrlen, address); |
| 1420 | if (err < 0) |
| 1421 | goto out_put; |
| 1422 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1423 | err = |
| 1424 | security_socket_connect(sock, (struct sockaddr *)address, addrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | if (err) |
| 1426 | goto out_put; |
| 1427 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1428 | err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | sock->file->f_flags); |
| 1430 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1431 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | out: |
| 1433 | return err; |
| 1434 | } |
| 1435 | |
| 1436 | /* |
| 1437 | * Get the local address ('name') of a socket object. Move the obtained |
| 1438 | * name to user space. |
| 1439 | */ |
| 1440 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1441 | asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
| 1442 | int __user *usockaddr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | { |
| 1444 | struct socket *sock; |
| 1445 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1446 | int len, err, fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1447 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1448 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | if (!sock) |
| 1450 | goto out; |
| 1451 | |
| 1452 | err = security_socket_getsockname(sock); |
| 1453 | if (err) |
| 1454 | goto out_put; |
| 1455 | |
| 1456 | err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0); |
| 1457 | if (err) |
| 1458 | goto out_put; |
| 1459 | err = move_addr_to_user(address, len, usockaddr, usockaddr_len); |
| 1460 | |
| 1461 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1462 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | out: |
| 1464 | return err; |
| 1465 | } |
| 1466 | |
| 1467 | /* |
| 1468 | * Get the remote address ('name') of a socket object. Move the obtained |
| 1469 | * name to user space. |
| 1470 | */ |
| 1471 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1472 | asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
| 1473 | int __user *usockaddr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | { |
| 1475 | struct socket *sock; |
| 1476 | char address[MAX_SOCK_ADDR]; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1477 | int len, err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1479 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1480 | if (sock != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | err = security_socket_getpeername(sock); |
| 1482 | if (err) { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1483 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | return err; |
| 1485 | } |
| 1486 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1487 | err = |
| 1488 | sock->ops->getname(sock, (struct sockaddr *)address, &len, |
| 1489 | 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | if (!err) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1491 | err = move_addr_to_user(address, len, usockaddr, |
| 1492 | usockaddr_len); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1493 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | } |
| 1495 | return err; |
| 1496 | } |
| 1497 | |
| 1498 | /* |
| 1499 | * Send a datagram to a given address. We move the address into kernel |
| 1500 | * space and check the user space data area is readable before invoking |
| 1501 | * the protocol. |
| 1502 | */ |
| 1503 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1504 | asmlinkage long sys_sendto(int fd, void __user *buff, size_t len, |
| 1505 | unsigned flags, struct sockaddr __user *addr, |
| 1506 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | { |
| 1508 | struct socket *sock; |
| 1509 | char address[MAX_SOCK_ADDR]; |
| 1510 | int err; |
| 1511 | struct msghdr msg; |
| 1512 | struct iovec iov; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1513 | int fput_needed; |
| 1514 | struct file *sock_file; |
| 1515 | |
| 1516 | sock_file = fget_light(fd, &fput_needed); |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1517 | err = -EBADF; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1518 | if (!sock_file) |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1519 | goto out; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1520 | |
| 1521 | sock = sock_from_file(sock_file, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | if (!sock) |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1523 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1524 | iov.iov_base = buff; |
| 1525 | iov.iov_len = len; |
| 1526 | msg.msg_name = NULL; |
| 1527 | msg.msg_iov = &iov; |
| 1528 | msg.msg_iovlen = 1; |
| 1529 | msg.msg_control = NULL; |
| 1530 | msg.msg_controllen = 0; |
| 1531 | msg.msg_namelen = 0; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1532 | if (addr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | err = move_addr_to_kernel(addr, addr_len, address); |
| 1534 | if (err < 0) |
| 1535 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1536 | msg.msg_name = address; |
| 1537 | msg.msg_namelen = addr_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | if (sock->file->f_flags & O_NONBLOCK) |
| 1540 | flags |= MSG_DONTWAIT; |
| 1541 | msg.msg_flags = flags; |
| 1542 | err = sock_sendmsg(sock, &msg, len); |
| 1543 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1544 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1545 | fput_light(sock_file, fput_needed); |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1546 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | return err; |
| 1548 | } |
| 1549 | |
| 1550 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1551 | * Send a datagram down a socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | */ |
| 1553 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1554 | 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] | 1555 | { |
| 1556 | return sys_sendto(fd, buff, len, flags, NULL, 0); |
| 1557 | } |
| 1558 | |
| 1559 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1560 | * 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] | 1561 | * sender. We verify the buffers are writable and if needed move the |
| 1562 | * sender address from kernel to user space. |
| 1563 | */ |
| 1564 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1565 | asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size, |
| 1566 | unsigned flags, struct sockaddr __user *addr, |
| 1567 | int __user *addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | { |
| 1569 | struct socket *sock; |
| 1570 | struct iovec iov; |
| 1571 | struct msghdr msg; |
| 1572 | char address[MAX_SOCK_ADDR]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1573 | int err, err2; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1574 | struct file *sock_file; |
| 1575 | int fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1577 | sock_file = fget_light(fd, &fput_needed); |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1578 | err = -EBADF; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1579 | if (!sock_file) |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1580 | goto out; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1581 | |
| 1582 | sock = sock_from_file(sock_file, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | if (!sock) |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1584 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1586 | msg.msg_control = NULL; |
| 1587 | msg.msg_controllen = 0; |
| 1588 | msg.msg_iovlen = 1; |
| 1589 | msg.msg_iov = &iov; |
| 1590 | iov.iov_len = size; |
| 1591 | iov.iov_base = ubuf; |
| 1592 | msg.msg_name = address; |
| 1593 | msg.msg_namelen = MAX_SOCK_ADDR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | if (sock->file->f_flags & O_NONBLOCK) |
| 1595 | flags |= MSG_DONTWAIT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1596 | err = sock_recvmsg(sock, &msg, size, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1598 | if (err >= 0 && addr != NULL) { |
| 1599 | err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len); |
| 1600 | if (err2 < 0) |
| 1601 | err = err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | } |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1603 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1604 | fput_light(sock_file, fput_needed); |
David S. Miller | 4387ff7 | 2007-02-08 15:06:08 -0800 | [diff] [blame] | 1605 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | return err; |
| 1607 | } |
| 1608 | |
| 1609 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1610 | * Receive a datagram from a socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | */ |
| 1612 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1613 | asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, |
| 1614 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | { |
| 1616 | return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
| 1617 | } |
| 1618 | |
| 1619 | /* |
| 1620 | * Set a socket option. Because we don't know the option lengths we have |
| 1621 | * to pass the user mode parameter for the protocols to sort out. |
| 1622 | */ |
| 1623 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1624 | asmlinkage long sys_setsockopt(int fd, int level, int optname, |
| 1625 | char __user *optval, int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1627 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | struct socket *sock; |
| 1629 | |
| 1630 | if (optlen < 0) |
| 1631 | return -EINVAL; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1632 | |
| 1633 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1634 | if (sock != NULL) { |
| 1635 | err = security_socket_setsockopt(sock, level, optname); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1636 | if (err) |
| 1637 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | |
| 1639 | if (level == SOL_SOCKET) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1640 | err = |
| 1641 | sock_setsockopt(sock, level, optname, optval, |
| 1642 | optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1644 | err = |
| 1645 | sock->ops->setsockopt(sock, level, optname, optval, |
| 1646 | optlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1647 | out_put: |
| 1648 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | } |
| 1650 | return err; |
| 1651 | } |
| 1652 | |
| 1653 | /* |
| 1654 | * Get a socket option. Because we don't know the option lengths we have |
| 1655 | * to pass a user mode parameter for the protocols to sort out. |
| 1656 | */ |
| 1657 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1658 | asmlinkage long sys_getsockopt(int fd, int level, int optname, |
| 1659 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1661 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | struct socket *sock; |
| 1663 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1664 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1665 | if (sock != NULL) { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1666 | err = security_socket_getsockopt(sock, level, optname); |
| 1667 | if (err) |
| 1668 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
| 1670 | if (level == SOL_SOCKET) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1671 | err = |
| 1672 | sock_getsockopt(sock, level, optname, optval, |
| 1673 | optlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1675 | err = |
| 1676 | sock->ops->getsockopt(sock, level, optname, optval, |
| 1677 | optlen); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1678 | out_put: |
| 1679 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | } |
| 1681 | return err; |
| 1682 | } |
| 1683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | /* |
| 1685 | * Shutdown a socket. |
| 1686 | */ |
| 1687 | |
| 1688 | asmlinkage long sys_shutdown(int fd, int how) |
| 1689 | { |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1690 | int err, fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | struct socket *sock; |
| 1692 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1693 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1694 | if (sock != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | err = security_socket_shutdown(sock, how); |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1696 | if (!err) |
| 1697 | err = sock->ops->shutdown(sock, how); |
| 1698 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | } |
| 1700 | return err; |
| 1701 | } |
| 1702 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1703 | /* 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] | 1704 | * fields which are the same type (int / unsigned) on our platforms. |
| 1705 | */ |
| 1706 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
| 1707 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
| 1708 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
| 1709 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | /* |
| 1711 | * BSD sendmsg interface |
| 1712 | */ |
| 1713 | |
| 1714 | asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) |
| 1715 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1716 | struct compat_msghdr __user *msg_compat = |
| 1717 | (struct compat_msghdr __user *)msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | struct socket *sock; |
| 1719 | char address[MAX_SOCK_ADDR]; |
| 1720 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
Alex Williamson | b9d717a | 2005-09-26 14:28:02 -0700 | [diff] [blame] | 1721 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1722 | __attribute__ ((aligned(sizeof(__kernel_size_t)))); |
| 1723 | /* 20 is size of ipv6_pktinfo */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | unsigned char *ctl_buf = ctl; |
| 1725 | struct msghdr msg_sys; |
| 1726 | int err, ctl_len, iov_size, total_len; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1727 | int fput_needed; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | err = -EFAULT; |
| 1730 | if (MSG_CMSG_COMPAT & flags) { |
| 1731 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
| 1732 | return -EFAULT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1733 | } |
| 1734 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | return -EFAULT; |
| 1736 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1737 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1738 | if (!sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | goto out; |
| 1740 | |
| 1741 | /* do not move before msg_sys is valid */ |
| 1742 | err = -EMSGSIZE; |
| 1743 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| 1744 | goto out_put; |
| 1745 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1746 | /* Check whether to allocate the iovec area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | err = -ENOMEM; |
| 1748 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| 1749 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| 1750 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| 1751 | if (!iov) |
| 1752 | goto out_put; |
| 1753 | } |
| 1754 | |
| 1755 | /* This will also move the address data into kernel space */ |
| 1756 | if (MSG_CMSG_COMPAT & flags) { |
| 1757 | err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ); |
| 1758 | } else |
| 1759 | err = verify_iovec(&msg_sys, iov, address, VERIFY_READ); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1760 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | goto out_freeiov; |
| 1762 | total_len = err; |
| 1763 | |
| 1764 | err = -ENOBUFS; |
| 1765 | |
| 1766 | if (msg_sys.msg_controllen > INT_MAX) |
| 1767 | goto out_freeiov; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1768 | ctl_len = msg_sys.msg_controllen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1770 | err = |
| 1771 | cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, |
| 1772 | sizeof(ctl)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | if (err) |
| 1774 | goto out_freeiov; |
| 1775 | ctl_buf = msg_sys.msg_control; |
Al Viro | 8920e8f | 2005-09-07 18:28:51 -0700 | [diff] [blame] | 1776 | ctl_len = msg_sys.msg_controllen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | } else if (ctl_len) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1778 | if (ctl_len > sizeof(ctl)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1780 | if (ctl_buf == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | goto out_freeiov; |
| 1782 | } |
| 1783 | err = -EFAULT; |
| 1784 | /* |
| 1785 | * Careful! Before this, msg_sys.msg_control contains a user pointer. |
| 1786 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
| 1787 | * checking falls down on this. |
| 1788 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1789 | if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, |
| 1790 | ctl_len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | goto out_freectl; |
| 1792 | msg_sys.msg_control = ctl_buf; |
| 1793 | } |
| 1794 | msg_sys.msg_flags = flags; |
| 1795 | |
| 1796 | if (sock->file->f_flags & O_NONBLOCK) |
| 1797 | msg_sys.msg_flags |= MSG_DONTWAIT; |
| 1798 | err = sock_sendmsg(sock, &msg_sys, total_len); |
| 1799 | |
| 1800 | out_freectl: |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1801 | if (ctl_buf != ctl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
| 1803 | out_freeiov: |
| 1804 | if (iov != iovstack) |
| 1805 | sock_kfree_s(sock->sk, iov, iov_size); |
| 1806 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1807 | fput_light(sock->file, fput_needed); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1808 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | return err; |
| 1810 | } |
| 1811 | |
| 1812 | /* |
| 1813 | * BSD recvmsg interface |
| 1814 | */ |
| 1815 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1816 | asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, |
| 1817 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1819 | struct compat_msghdr __user *msg_compat = |
| 1820 | (struct compat_msghdr __user *)msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | struct socket *sock; |
| 1822 | struct iovec iovstack[UIO_FASTIOV]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1823 | struct iovec *iov = iovstack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | struct msghdr msg_sys; |
| 1825 | unsigned long cmsg_ptr; |
| 1826 | int err, iov_size, total_len, len; |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1827 | int fput_needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | |
| 1829 | /* kernel mode address */ |
| 1830 | char addr[MAX_SOCK_ADDR]; |
| 1831 | |
| 1832 | /* user mode address pointers */ |
| 1833 | struct sockaddr __user *uaddr; |
| 1834 | int __user *uaddr_len; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | if (MSG_CMSG_COMPAT & flags) { |
| 1837 | if (get_compat_msghdr(&msg_sys, msg_compat)) |
| 1838 | return -EFAULT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1839 | } |
| 1840 | else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) |
| 1841 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1843 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | if (!sock) |
| 1845 | goto out; |
| 1846 | |
| 1847 | err = -EMSGSIZE; |
| 1848 | if (msg_sys.msg_iovlen > UIO_MAXIOV) |
| 1849 | goto out_put; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1850 | |
| 1851 | /* Check whether to allocate the iovec area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | err = -ENOMEM; |
| 1853 | iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); |
| 1854 | if (msg_sys.msg_iovlen > UIO_FASTIOV) { |
| 1855 | iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); |
| 1856 | if (!iov) |
| 1857 | goto out_put; |
| 1858 | } |
| 1859 | |
| 1860 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1861 | * Save the user-mode address (verify_iovec will change the |
| 1862 | * kernel msghdr to use the kernel address space) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1864 | |
| 1865 | uaddr = (void __user *)msg_sys.msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | uaddr_len = COMPAT_NAMELEN(msg); |
| 1867 | if (MSG_CMSG_COMPAT & flags) { |
| 1868 | err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
| 1869 | } else |
| 1870 | err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE); |
| 1871 | if (err < 0) |
| 1872 | goto out_freeiov; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1873 | total_len = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | |
| 1875 | cmsg_ptr = (unsigned long)msg_sys.msg_control; |
| 1876 | msg_sys.msg_flags = 0; |
| 1877 | if (MSG_CMSG_COMPAT & flags) |
| 1878 | msg_sys.msg_flags = MSG_CMSG_COMPAT; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | if (sock->file->f_flags & O_NONBLOCK) |
| 1881 | flags |= MSG_DONTWAIT; |
| 1882 | err = sock_recvmsg(sock, &msg_sys, total_len, flags); |
| 1883 | if (err < 0) |
| 1884 | goto out_freeiov; |
| 1885 | len = err; |
| 1886 | |
| 1887 | if (uaddr != NULL) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1888 | err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr, |
| 1889 | uaddr_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | if (err < 0) |
| 1891 | goto out_freeiov; |
| 1892 | } |
David S. Miller | 37f7f42 | 2005-09-16 16:51:01 -0700 | [diff] [blame] | 1893 | err = __put_user((msg_sys.msg_flags & ~MSG_CMSG_COMPAT), |
| 1894 | COMPAT_FLAGS(msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | if (err) |
| 1896 | goto out_freeiov; |
| 1897 | if (MSG_CMSG_COMPAT & flags) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1898 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | &msg_compat->msg_controllen); |
| 1900 | else |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1901 | err = __put_user((unsigned long)msg_sys.msg_control - cmsg_ptr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | &msg->msg_controllen); |
| 1903 | if (err) |
| 1904 | goto out_freeiov; |
| 1905 | err = len; |
| 1906 | |
| 1907 | out_freeiov: |
| 1908 | if (iov != iovstack) |
| 1909 | sock_kfree_s(sock->sk, iov, iov_size); |
| 1910 | out_put: |
Benjamin LaHaise | 6cb153c | 2006-03-20 22:27:12 -0800 | [diff] [blame] | 1911 | fput_light(sock->file, fput_needed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | out: |
| 1913 | return err; |
| 1914 | } |
| 1915 | |
| 1916 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
| 1917 | |
| 1918 | /* Argument list sizes for sys_socketcall */ |
| 1919 | #define AL(x) ((x) * sizeof(unsigned long)) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1920 | static const unsigned char nargs[18]={ |
| 1921 | AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), |
| 1922 | AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), |
| 1923 | AL(6),AL(2),AL(5),AL(5),AL(3),AL(3) |
| 1924 | }; |
| 1925 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | #undef AL |
| 1927 | |
| 1928 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1929 | * System call vectors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | * |
| 1931 | * Argument checking cleaned up. Saved 20% in size. |
| 1932 | * This function doesn't need to set the kernel lock because |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1933 | * it is set by the callees. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | */ |
| 1935 | |
| 1936 | asmlinkage long sys_socketcall(int call, unsigned long __user *args) |
| 1937 | { |
| 1938 | unsigned long a[6]; |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1939 | unsigned long a0, a1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | int err; |
| 1941 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1942 | if (call < 1 || call > SYS_RECVMSG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | return -EINVAL; |
| 1944 | |
| 1945 | /* copy_from_user should be SMP safe. */ |
| 1946 | if (copy_from_user(a, args, nargs[call])) |
| 1947 | return -EFAULT; |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 1948 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1949 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
David Woodhouse | 3ec3b2f | 2005-05-17 12:08:48 +0100 | [diff] [blame] | 1950 | if (err) |
| 1951 | return err; |
| 1952 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 1953 | a0 = a[0]; |
| 1954 | a1 = a[1]; |
| 1955 | |
| 1956 | switch (call) { |
| 1957 | case SYS_SOCKET: |
| 1958 | err = sys_socket(a0, a1, a[2]); |
| 1959 | break; |
| 1960 | case SYS_BIND: |
| 1961 | err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
| 1962 | break; |
| 1963 | case SYS_CONNECT: |
| 1964 | err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
| 1965 | break; |
| 1966 | case SYS_LISTEN: |
| 1967 | err = sys_listen(a0, a1); |
| 1968 | break; |
| 1969 | case SYS_ACCEPT: |
| 1970 | err = |
| 1971 | sys_accept(a0, (struct sockaddr __user *)a1, |
| 1972 | (int __user *)a[2]); |
| 1973 | break; |
| 1974 | case SYS_GETSOCKNAME: |
| 1975 | err = |
| 1976 | sys_getsockname(a0, (struct sockaddr __user *)a1, |
| 1977 | (int __user *)a[2]); |
| 1978 | break; |
| 1979 | case SYS_GETPEERNAME: |
| 1980 | err = |
| 1981 | sys_getpeername(a0, (struct sockaddr __user *)a1, |
| 1982 | (int __user *)a[2]); |
| 1983 | break; |
| 1984 | case SYS_SOCKETPAIR: |
| 1985 | err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
| 1986 | break; |
| 1987 | case SYS_SEND: |
| 1988 | err = sys_send(a0, (void __user *)a1, a[2], a[3]); |
| 1989 | break; |
| 1990 | case SYS_SENDTO: |
| 1991 | err = sys_sendto(a0, (void __user *)a1, a[2], a[3], |
| 1992 | (struct sockaddr __user *)a[4], a[5]); |
| 1993 | break; |
| 1994 | case SYS_RECV: |
| 1995 | err = sys_recv(a0, (void __user *)a1, a[2], a[3]); |
| 1996 | break; |
| 1997 | case SYS_RECVFROM: |
| 1998 | err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
| 1999 | (struct sockaddr __user *)a[4], |
| 2000 | (int __user *)a[5]); |
| 2001 | break; |
| 2002 | case SYS_SHUTDOWN: |
| 2003 | err = sys_shutdown(a0, a1); |
| 2004 | break; |
| 2005 | case SYS_SETSOCKOPT: |
| 2006 | err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); |
| 2007 | break; |
| 2008 | case SYS_GETSOCKOPT: |
| 2009 | err = |
| 2010 | sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
| 2011 | (int __user *)a[4]); |
| 2012 | break; |
| 2013 | case SYS_SENDMSG: |
| 2014 | err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); |
| 2015 | break; |
| 2016 | case SYS_RECVMSG: |
| 2017 | err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); |
| 2018 | break; |
| 2019 | default: |
| 2020 | err = -EINVAL; |
| 2021 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | } |
| 2023 | return err; |
| 2024 | } |
| 2025 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2026 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2028 | /** |
| 2029 | * sock_register - add a socket protocol handler |
| 2030 | * @ops: description of protocol |
| 2031 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | * This function is called by a protocol handler that wants to |
| 2033 | * advertise its address family, and have it linked into the |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2034 | * socket interface. The value ops->family coresponds to the |
| 2035 | * socket system call protocol family. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | */ |
Stephen Hemminger | f0fd27d | 2006-08-09 21:03:17 -0700 | [diff] [blame] | 2037 | int sock_register(const struct net_proto_family *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | { |
| 2039 | int err; |
| 2040 | |
| 2041 | if (ops->family >= NPROTO) { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2042 | printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, |
| 2043 | NPROTO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | return -ENOBUFS; |
| 2045 | } |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2046 | |
| 2047 | spin_lock(&net_family_lock); |
| 2048 | if (net_families[ops->family]) |
| 2049 | err = -EEXIST; |
| 2050 | else { |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2051 | net_families[ops->family] = ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | err = 0; |
| 2053 | } |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2054 | spin_unlock(&net_family_lock); |
| 2055 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2056 | printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | return err; |
| 2058 | } |
| 2059 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2060 | /** |
| 2061 | * sock_unregister - remove a protocol handler |
| 2062 | * @family: protocol family to remove |
| 2063 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | * This function is called by a protocol handler that wants to |
| 2065 | * remove its address family, and have it unlinked from the |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2066 | * new socket creation. |
| 2067 | * |
| 2068 | * If protocol handler is a module, then it can use module reference |
| 2069 | * counts to protect against new references. If protocol handler is not |
| 2070 | * a module then it needs to provide its own protection in |
| 2071 | * the ops->create routine. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | */ |
Stephen Hemminger | f0fd27d | 2006-08-09 21:03:17 -0700 | [diff] [blame] | 2073 | void sock_unregister(int family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | { |
Stephen Hemminger | f0fd27d | 2006-08-09 21:03:17 -0700 | [diff] [blame] | 2075 | BUG_ON(family < 0 || family >= NPROTO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2077 | spin_lock(&net_family_lock); |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2078 | net_families[family] = NULL; |
Stephen Hemminger | 55737fd | 2006-09-01 00:23:39 -0700 | [diff] [blame] | 2079 | spin_unlock(&net_family_lock); |
| 2080 | |
| 2081 | synchronize_rcu(); |
| 2082 | |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2083 | printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | } |
| 2085 | |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2086 | static int __init sock_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | { |
| 2088 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2089 | * Initialize sock SLAB cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | */ |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | sk_init(); |
| 2093 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2095 | * Initialize skbuff SLAB cache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | */ |
| 2097 | skb_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
| 2099 | /* |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2100 | * Initialize the protocols module. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | */ |
| 2102 | |
| 2103 | init_inodecache(); |
| 2104 | register_filesystem(&sock_fs_type); |
| 2105 | sock_mnt = kern_mount(&sock_fs_type); |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2106 | |
| 2107 | /* The real protocol initialization is performed in later initcalls. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | */ |
| 2109 | |
| 2110 | #ifdef CONFIG_NETFILTER |
| 2111 | netfilter_init(); |
| 2112 | #endif |
David S. Miller | cbeb321 | 2005-12-22 12:58:55 -0800 | [diff] [blame] | 2113 | |
| 2114 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | } |
| 2116 | |
Andi Kleen | 77d76ea | 2005-12-22 12:43:42 -0800 | [diff] [blame] | 2117 | core_initcall(sock_init); /* early initcall */ |
| 2118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | #ifdef CONFIG_PROC_FS |
| 2120 | void socket_seq_show(struct seq_file *seq) |
| 2121 | { |
| 2122 | int cpu; |
| 2123 | int counter = 0; |
| 2124 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 2125 | for_each_possible_cpu(cpu) |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2126 | counter += per_cpu(sockets_in_use, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | |
| 2128 | /* It can be negative, by the way. 8) */ |
| 2129 | if (counter < 0) |
| 2130 | counter = 0; |
| 2131 | |
| 2132 | seq_printf(seq, "sockets: used %d\n", counter); |
| 2133 | } |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2134 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 2136 | #ifdef CONFIG_COMPAT |
| 2137 | static long compat_sock_ioctl(struct file *file, unsigned cmd, |
Stephen Hemminger | 89bddce | 2006-09-01 00:19:31 -0700 | [diff] [blame] | 2138 | unsigned long arg) |
Shaun Pereira | 89bbfc9 | 2006-03-21 23:58:08 -0800 | [diff] [blame] | 2139 | { |
| 2140 | struct socket *sock = file->private_data; |
| 2141 | int ret = -ENOIOCTLCMD; |
| 2142 | |
| 2143 | if (sock->ops->compat_ioctl) |
| 2144 | ret = sock->ops->compat_ioctl(sock, cmd, arg); |
| 2145 | |
| 2146 | return ret; |
| 2147 | } |
| 2148 | #endif |
| 2149 | |
Sridhar Samudrala | ac5a488 | 2006-08-07 20:57:31 -0700 | [diff] [blame] | 2150 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
| 2151 | { |
| 2152 | return sock->ops->bind(sock, addr, addrlen); |
| 2153 | } |
| 2154 | |
| 2155 | int kernel_listen(struct socket *sock, int backlog) |
| 2156 | { |
| 2157 | return sock->ops->listen(sock, backlog); |
| 2158 | } |
| 2159 | |
| 2160 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
| 2161 | { |
| 2162 | struct sock *sk = sock->sk; |
| 2163 | int err; |
| 2164 | |
| 2165 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
| 2166 | newsock); |
| 2167 | if (err < 0) |
| 2168 | goto done; |
| 2169 | |
| 2170 | err = sock->ops->accept(sock, *newsock, flags); |
| 2171 | if (err < 0) { |
| 2172 | sock_release(*newsock); |
| 2173 | goto done; |
| 2174 | } |
| 2175 | |
| 2176 | (*newsock)->ops = sock->ops; |
| 2177 | |
| 2178 | done: |
| 2179 | return err; |
| 2180 | } |
| 2181 | |
| 2182 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
YOSHIFUJI Hideaki | 4768fbc | 2007-02-09 23:25:31 +0900 | [diff] [blame] | 2183 | int flags) |
Sridhar Samudrala | ac5a488 | 2006-08-07 20:57:31 -0700 | [diff] [blame] | 2184 | { |
| 2185 | return sock->ops->connect(sock, addr, addrlen, flags); |
| 2186 | } |
| 2187 | |
| 2188 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr, |
| 2189 | int *addrlen) |
| 2190 | { |
| 2191 | return sock->ops->getname(sock, addr, addrlen, 0); |
| 2192 | } |
| 2193 | |
| 2194 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr, |
| 2195 | int *addrlen) |
| 2196 | { |
| 2197 | return sock->ops->getname(sock, addr, addrlen, 1); |
| 2198 | } |
| 2199 | |
| 2200 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
| 2201 | char *optval, int *optlen) |
| 2202 | { |
| 2203 | mm_segment_t oldfs = get_fs(); |
| 2204 | int err; |
| 2205 | |
| 2206 | set_fs(KERNEL_DS); |
| 2207 | if (level == SOL_SOCKET) |
| 2208 | err = sock_getsockopt(sock, level, optname, optval, optlen); |
| 2209 | else |
| 2210 | err = sock->ops->getsockopt(sock, level, optname, optval, |
| 2211 | optlen); |
| 2212 | set_fs(oldfs); |
| 2213 | return err; |
| 2214 | } |
| 2215 | |
| 2216 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
| 2217 | char *optval, int optlen) |
| 2218 | { |
| 2219 | mm_segment_t oldfs = get_fs(); |
| 2220 | int err; |
| 2221 | |
| 2222 | set_fs(KERNEL_DS); |
| 2223 | if (level == SOL_SOCKET) |
| 2224 | err = sock_setsockopt(sock, level, optname, optval, optlen); |
| 2225 | else |
| 2226 | err = sock->ops->setsockopt(sock, level, optname, optval, |
| 2227 | optlen); |
| 2228 | set_fs(oldfs); |
| 2229 | return err; |
| 2230 | } |
| 2231 | |
| 2232 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
| 2233 | size_t size, int flags) |
| 2234 | { |
| 2235 | if (sock->ops->sendpage) |
| 2236 | return sock->ops->sendpage(sock, page, offset, size, flags); |
| 2237 | |
| 2238 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 2239 | } |
| 2240 | |
| 2241 | int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) |
| 2242 | { |
| 2243 | mm_segment_t oldfs = get_fs(); |
| 2244 | int err; |
| 2245 | |
| 2246 | set_fs(KERNEL_DS); |
| 2247 | err = sock->ops->ioctl(sock, cmd, arg); |
| 2248 | set_fs(oldfs); |
| 2249 | |
| 2250 | return err; |
| 2251 | } |
| 2252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2253 | /* ABI emulation layers need these two */ |
| 2254 | EXPORT_SYMBOL(move_addr_to_kernel); |
| 2255 | EXPORT_SYMBOL(move_addr_to_user); |
| 2256 | EXPORT_SYMBOL(sock_create); |
| 2257 | EXPORT_SYMBOL(sock_create_kern); |
| 2258 | EXPORT_SYMBOL(sock_create_lite); |
| 2259 | EXPORT_SYMBOL(sock_map_fd); |
| 2260 | EXPORT_SYMBOL(sock_recvmsg); |
| 2261 | EXPORT_SYMBOL(sock_register); |
| 2262 | EXPORT_SYMBOL(sock_release); |
| 2263 | EXPORT_SYMBOL(sock_sendmsg); |
| 2264 | EXPORT_SYMBOL(sock_unregister); |
| 2265 | EXPORT_SYMBOL(sock_wake_async); |
| 2266 | EXPORT_SYMBOL(sockfd_lookup); |
| 2267 | EXPORT_SYMBOL(kernel_sendmsg); |
| 2268 | EXPORT_SYMBOL(kernel_recvmsg); |
Sridhar Samudrala | ac5a488 | 2006-08-07 20:57:31 -0700 | [diff] [blame] | 2269 | EXPORT_SYMBOL(kernel_bind); |
| 2270 | EXPORT_SYMBOL(kernel_listen); |
| 2271 | EXPORT_SYMBOL(kernel_accept); |
| 2272 | EXPORT_SYMBOL(kernel_connect); |
| 2273 | EXPORT_SYMBOL(kernel_getsockname); |
| 2274 | EXPORT_SYMBOL(kernel_getpeername); |
| 2275 | EXPORT_SYMBOL(kernel_getsockopt); |
| 2276 | EXPORT_SYMBOL(kernel_setsockopt); |
| 2277 | EXPORT_SYMBOL(kernel_sendpage); |
| 2278 | EXPORT_SYMBOL(kernel_sock_ioctl); |