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> 7 * Ross Biro 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) 45 * Tigran Aivazian : Made listen(2) backlog sanity checks 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 56 * paradigm. 57 * 58 * Based upon Swansea University Computer Society NET3.039 59 */ 60 61 #include <linux/mm.h> 62 #include <linux/socket.h> 63 #include <linux/file.h> 64 #include <linux/net.h> 65 #include <linux/interrupt.h> 66 #include <linux/thread_info.h> 67 #include <linux/rcupdate.h> 68 #include <linux/netdevice.h> 69 #include <linux/proc_fs.h> 70 #include <linux/seq_file.h> 71 #include <linux/mutex.h> 72 #include <linux/wanrouter.h> 73 #include <linux/if_bridge.h> 74 #include <linux/if_frad.h> 75 #include <linux/if_vlan.h> 76 #include <linux/init.h> 77 #include <linux/poll.h> 78 #include <linux/cache.h> 79 #include <linux/module.h> 80 #include <linux/highmem.h> 81 #include <linux/mount.h> 82 #include <linux/security.h> 83 #include <linux/syscalls.h> 84 #include <linux/compat.h> 85 #include <linux/kmod.h> 86 #include <linux/audit.h> 87 #include <linux/wireless.h> 88 #include <linux/nsproxy.h> 89 #include <linux/magic.h> 90 #include <linux/slab.h> 91 92 #include <asm/uaccess.h> 93 #include <asm/unistd.h> 94 95 #include <net/compat.h> 96 #include <net/wext.h> 97 98 #include <net/sock.h> 99 #include <linux/netfilter.h> 100 101 #include <linux/if_tun.h> 102 #include <linux/ipv6_route.h> 103 #include <linux/route.h> 104 #include <linux/sockios.h> 105 #include <linux/atalk.h> 106 107 static int sock_no_open(struct inode *irrelevant, struct file *dontcare); 108 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 109 unsigned long nr_segs, loff_t pos); 110 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 111 unsigned long nr_segs, loff_t pos); 112 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 113 114 static int sock_close(struct inode *inode, struct file *file); 115 static unsigned int sock_poll(struct file *file, 116 struct poll_table_struct *wait); 117 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 118 #ifdef CONFIG_COMPAT 119 static long compat_sock_ioctl(struct file *file, 120 unsigned int cmd, unsigned long arg); 121 #endif 122 static int sock_fasync(int fd, struct file *filp, int on); 123 static ssize_t sock_sendpage(struct file *file, struct page *page, 124 int offset, size_t size, loff_t *ppos, int more); 125 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 126 struct pipe_inode_info *pipe, size_t len, 127 unsigned int flags); 128 129 /* 130 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 131 * in the operation structures but are done directly via the socketcall() multiplexor. 132 */ 133 134 static const struct file_operations socket_file_ops = { 135 .owner = THIS_MODULE, 136 .llseek = no_llseek, 137 .aio_read = sock_aio_read, 138 .aio_write = sock_aio_write, 139 .poll = sock_poll, 140 .unlocked_ioctl = sock_ioctl, 141 #ifdef CONFIG_COMPAT 142 .compat_ioctl = compat_sock_ioctl, 143 #endif 144 .mmap = sock_mmap, 145 .open = sock_no_open, /* special open code to disallow open via /proc */ 146 .release = sock_close, 147 .fasync = sock_fasync, 148 .sendpage = sock_sendpage, 149 .splice_write = generic_splice_sendpage, 150 .splice_read = sock_splice_read, 151 }; 152 153 /* 154 * The protocol list. Each protocol is registered in here. 155 */ 156 157 static DEFINE_SPINLOCK(net_family_lock); 158 static const struct net_proto_family *net_families[NPROTO] __read_mostly; 159 160 /* 161 * Statistics counters of the socket lists 162 */ 163 164 static DEFINE_PER_CPU(int, sockets_in_use) = 0; 165 166 /* 167 * Support routines. 168 * Move socket addresses back and forth across the kernel/user 169 * divide and look after the messy bits. 170 */ 171 172 #define MAX_SOCK_ADDR 128 /* 108 for Unix domain - 173 16 for IP, 16 for IPX, 174 24 for IPv6, 175 about 80 for AX.25 176 must be at least one bigger than 177 the AF_UNIX size (see net/unix/af_unix.c 178 :unix_mkname()). 179 */ 180 181 /** 182 * move_addr_to_kernel - copy a socket address into kernel space 183 * @uaddr: Address in user space 184 * @kaddr: Address in kernel space 185 * @ulen: Length in user space 186 * 187 * The address is copied into kernel space. If the provided address is 188 * too long an error code of -EINVAL is returned. If the copy gives 189 * invalid addresses -EFAULT is returned. On a success 0 is returned. 190 */ 191 192 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr) 193 { 194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 195 return -EINVAL; 196 if (ulen == 0) 197 return 0; 198 if (copy_from_user(kaddr, uaddr, ulen)) 199 return -EFAULT; 200 return audit_sockaddr(ulen, kaddr); 201 } 202 203 /** 204 * move_addr_to_user - copy an address to user space 205 * @kaddr: kernel space address 206 * @klen: length of address in kernel 207 * @uaddr: user space address 208 * @ulen: pointer to user length field 209 * 210 * The value pointed to by ulen on entry is the buffer length available. 211 * This is overwritten with the buffer space used. -EINVAL is returned 212 * if an overlong buffer is specified or a negative buffer size. -EFAULT 213 * is returned if either the buffer or the length field are not 214 * accessible. 215 * After copying the data up to the limit the user specifies, the true 216 * length of the data is written over the length limit the user 217 * specified. Zero is returned for a success. 218 */ 219 220 int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr, 221 int __user *ulen) 222 { 223 int err; 224 int len; 225 226 err = get_user(len, ulen); 227 if (err) 228 return err; 229 if (len > klen) 230 len = klen; 231 if (len < 0 || len > sizeof(struct sockaddr_storage)) 232 return -EINVAL; 233 if (len) { 234 if (audit_sockaddr(klen, kaddr)) 235 return -ENOMEM; 236 if (copy_to_user(uaddr, kaddr, len)) 237 return -EFAULT; 238 } 239 /* 240 * "fromlen shall refer to the value before truncation.." 241 * 1003.1g 242 */ 243 return __put_user(klen, ulen); 244 } 245 246 static struct kmem_cache *sock_inode_cachep __read_mostly; 247 248 static struct inode *sock_alloc_inode(struct super_block *sb) 249 { 250 struct socket_alloc *ei; 251 252 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 253 if (!ei) 254 return NULL; 255 init_waitqueue_head(&ei->socket.wait); 256 257 ei->socket.fasync_list = NULL; 258 ei->socket.state = SS_UNCONNECTED; 259 ei->socket.flags = 0; 260 ei->socket.ops = NULL; 261 ei->socket.sk = NULL; 262 ei->socket.file = NULL; 263 264 return &ei->vfs_inode; 265 } 266 267 static void sock_destroy_inode(struct inode *inode) 268 { 269 kmem_cache_free(sock_inode_cachep, 270 container_of(inode, struct socket_alloc, vfs_inode)); 271 } 272 273 static void init_once(void *foo) 274 { 275 struct socket_alloc *ei = (struct socket_alloc *)foo; 276 277 inode_init_once(&ei->vfs_inode); 278 } 279 280 static int init_inodecache(void) 281 { 282 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 283 sizeof(struct socket_alloc), 284 0, 285 (SLAB_HWCACHE_ALIGN | 286 SLAB_RECLAIM_ACCOUNT | 287 SLAB_MEM_SPREAD), 288 init_once); 289 if (sock_inode_cachep == NULL) 290 return -ENOMEM; 291 return 0; 292 } 293 294 static const struct super_operations sockfs_ops = { 295 .alloc_inode = sock_alloc_inode, 296 .destroy_inode =sock_destroy_inode, 297 .statfs = simple_statfs, 298 }; 299 300 static int sockfs_get_sb(struct file_system_type *fs_type, 301 int flags, const char *dev_name, void *data, 302 struct vfsmount *mnt) 303 { 304 return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC, 305 mnt); 306 } 307 308 static struct vfsmount *sock_mnt __read_mostly; 309 310 static struct file_system_type sock_fs_type = { 311 .name = "sockfs", 312 .get_sb = sockfs_get_sb, 313 .kill_sb = kill_anon_super, 314 }; 315 316 /* 317 * sockfs_dname() is called from d_path(). 318 */ 319 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 320 { 321 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 322 dentry->d_inode->i_ino); 323 } 324 325 static const struct dentry_operations sockfs_dentry_operations = { 326 .d_dname = sockfs_dname, 327 }; 328 329 /* 330 * Obtains the first available file descriptor and sets it up for use. 331 * 332 * These functions create file structures and maps them to fd space 333 * of the current process. On success it returns file descriptor 334 * and file struct implicitly stored in sock->file. 335 * Note that another thread may close file descriptor before we return 336 * from this function. We use the fact that now we do not refer 337 * to socket after mapping. If one day we will need it, this 338 * function will increment ref. count on file by 1. 339 * 340 * In any case returned fd MAY BE not valid! 341 * This race condition is unavoidable 342 * with shared fd spaces, we cannot solve it inside kernel, 343 * but we take care of internal coherence yet. 344 */ 345 346 static int sock_alloc_file(struct socket *sock, struct file **f, int flags) 347 { 348 struct qstr name = { .name = "" }; 349 struct path path; 350 struct file *file; 351 int fd; 352 353 fd = get_unused_fd_flags(flags); 354 if (unlikely(fd < 0)) 355 return fd; 356 357 path.dentry = d_alloc(sock_mnt->mnt_sb->s_root, &name); 358 if (unlikely(!path.dentry)) { 359 put_unused_fd(fd); 360 return -ENOMEM; 361 } 362 path.mnt = mntget(sock_mnt); 363 364 path.dentry->d_op = &sockfs_dentry_operations; 365 d_instantiate(path.dentry, SOCK_INODE(sock)); 366 SOCK_INODE(sock)->i_fop = &socket_file_ops; 367 368 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 369 &socket_file_ops); 370 if (unlikely(!file)) { 371 /* drop dentry, keep inode */ 372 atomic_inc(&path.dentry->d_inode->i_count); 373 path_put(&path); 374 put_unused_fd(fd); 375 return -ENFILE; 376 } 377 378 sock->file = file; 379 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 380 file->f_pos = 0; 381 file->private_data = sock; 382 383 *f = file; 384 return fd; 385 } 386 387 int sock_map_fd(struct socket *sock, int flags) 388 { 389 struct file *newfile; 390 int fd = sock_alloc_file(sock, &newfile, flags); 391 392 if (likely(fd >= 0)) 393 fd_install(fd, newfile); 394 395 return fd; 396 } 397 398 static struct socket *sock_from_file(struct file *file, int *err) 399 { 400 if (file->f_op == &socket_file_ops) 401 return file->private_data; /* set in sock_map_fd */ 402 403 *err = -ENOTSOCK; 404 return NULL; 405 } 406 407 /** 408 * sockfd_lookup - Go from a file number to its socket slot 409 * @fd: file handle 410 * @err: pointer to an error code return 411 * 412 * The file handle passed in is locked and the socket it is bound 413 * too is returned. If an error occurs the err pointer is overwritten 414 * with a negative errno code and NULL is returned. The function checks 415 * for both invalid handles and passing a handle which is not a socket. 416 * 417 * On a success the socket object pointer is returned. 418 */ 419 420 struct socket *sockfd_lookup(int fd, int *err) 421 { 422 struct file *file; 423 struct socket *sock; 424 425 file = fget(fd); 426 if (!file) { 427 *err = -EBADF; 428 return NULL; 429 } 430 431 sock = sock_from_file(file, err); 432 if (!sock) 433 fput(file); 434 return sock; 435 } 436 437 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 438 { 439 struct file *file; 440 struct socket *sock; 441 442 *err = -EBADF; 443 file = fget_light(fd, fput_needed); 444 if (file) { 445 sock = sock_from_file(file, err); 446 if (sock) 447 return sock; 448 fput_light(file, *fput_needed); 449 } 450 return NULL; 451 } 452 453 /** 454 * sock_alloc - allocate a socket 455 * 456 * Allocate a new inode and socket object. The two are bound together 457 * and initialised. The socket is then returned. If we are out of inodes 458 * NULL is returned. 459 */ 460 461 static struct socket *sock_alloc(void) 462 { 463 struct inode *inode; 464 struct socket *sock; 465 466 inode = new_inode(sock_mnt->mnt_sb); 467 if (!inode) 468 return NULL; 469 470 sock = SOCKET_I(inode); 471 472 kmemcheck_annotate_bitfield(sock, type); 473 inode->i_mode = S_IFSOCK | S_IRWXUGO; 474 inode->i_uid = current_fsuid(); 475 inode->i_gid = current_fsgid(); 476 477 percpu_add(sockets_in_use, 1); 478 return sock; 479 } 480 481 /* 482 * In theory you can't get an open on this inode, but /proc provides 483 * a back door. Remember to keep it shut otherwise you'll let the 484 * creepy crawlies in. 485 */ 486 487 static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 488 { 489 return -ENXIO; 490 } 491 492 const struct file_operations bad_sock_fops = { 493 .owner = THIS_MODULE, 494 .open = sock_no_open, 495 }; 496 497 /** 498 * sock_release - close a socket 499 * @sock: socket to close 500 * 501 * The socket is released from the protocol stack if it has a release 502 * callback, and the inode is then released if the socket is bound to 503 * an inode not a file. 504 */ 505 506 void sock_release(struct socket *sock) 507 { 508 if (sock->ops) { 509 struct module *owner = sock->ops->owner; 510 511 sock->ops->release(sock); 512 sock->ops = NULL; 513 module_put(owner); 514 } 515 516 if (sock->fasync_list) 517 printk(KERN_ERR "sock_release: fasync list not empty!\n"); 518 519 percpu_sub(sockets_in_use, 1); 520 if (!sock->file) { 521 iput(SOCK_INODE(sock)); 522 return; 523 } 524 sock->file = NULL; 525 } 526 527 int sock_tx_timestamp(struct msghdr *msg, struct sock *sk, 528 union skb_shared_tx *shtx) 529 { 530 shtx->flags = 0; 531 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 532 shtx->hardware = 1; 533 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 534 shtx->software = 1; 535 return 0; 536 } 537 EXPORT_SYMBOL(sock_tx_timestamp); 538 539 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 540 struct msghdr *msg, size_t size) 541 { 542 struct sock_iocb *si = kiocb_to_siocb(iocb); 543 int err; 544 545 si->sock = sock; 546 si->scm = NULL; 547 si->msg = msg; 548 si->size = size; 549 550 err = security_socket_sendmsg(sock, msg, size); 551 if (err) 552 return err; 553 554 return sock->ops->sendmsg(iocb, sock, msg, size); 555 } 556 557 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 558 { 559 struct kiocb iocb; 560 struct sock_iocb siocb; 561 int ret; 562 563 init_sync_kiocb(&iocb, NULL); 564 iocb.private = &siocb; 565 ret = __sock_sendmsg(&iocb, sock, msg, size); 566 if (-EIOCBQUEUED == ret) 567 ret = wait_on_sync_kiocb(&iocb); 568 return ret; 569 } 570 571 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 572 struct kvec *vec, size_t num, size_t size) 573 { 574 mm_segment_t oldfs = get_fs(); 575 int result; 576 577 set_fs(KERNEL_DS); 578 /* 579 * the following is safe, since for compiler definitions of kvec and 580 * iovec are identical, yielding the same in-core layout and alignment 581 */ 582 msg->msg_iov = (struct iovec *)vec; 583 msg->msg_iovlen = num; 584 result = sock_sendmsg(sock, msg, size); 585 set_fs(oldfs); 586 return result; 587 } 588 589 static int ktime2ts(ktime_t kt, struct timespec *ts) 590 { 591 if (kt.tv64) { 592 *ts = ktime_to_timespec(kt); 593 return 1; 594 } else { 595 return 0; 596 } 597 } 598 599 /* 600 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 601 */ 602 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 603 struct sk_buff *skb) 604 { 605 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 606 struct timespec ts[3]; 607 int empty = 1; 608 struct skb_shared_hwtstamps *shhwtstamps = 609 skb_hwtstamps(skb); 610 611 /* Race occurred between timestamp enabling and packet 612 receiving. Fill in the current time for now. */ 613 if (need_software_tstamp && skb->tstamp.tv64 == 0) 614 __net_timestamp(skb); 615 616 if (need_software_tstamp) { 617 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 618 struct timeval tv; 619 skb_get_timestamp(skb, &tv); 620 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 621 sizeof(tv), &tv); 622 } else { 623 struct timespec ts; 624 skb_get_timestampns(skb, &ts); 625 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 626 sizeof(ts), &ts); 627 } 628 } 629 630 631 memset(ts, 0, sizeof(ts)); 632 if (skb->tstamp.tv64 && 633 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) { 634 skb_get_timestampns(skb, ts + 0); 635 empty = 0; 636 } 637 if (shhwtstamps) { 638 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) && 639 ktime2ts(shhwtstamps->syststamp, ts + 1)) 640 empty = 0; 641 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) && 642 ktime2ts(shhwtstamps->hwtstamp, ts + 2)) 643 empty = 0; 644 } 645 if (!empty) 646 put_cmsg(msg, SOL_SOCKET, 647 SCM_TIMESTAMPING, sizeof(ts), &ts); 648 } 649 650 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 651 652 inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) 653 { 654 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) 655 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 656 sizeof(__u32), &skb->dropcount); 657 } 658 659 void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 660 struct sk_buff *skb) 661 { 662 sock_recv_timestamp(msg, sk, skb); 663 sock_recv_drops(msg, sk, skb); 664 } 665 EXPORT_SYMBOL_GPL(sock_recv_ts_and_drops); 666 667 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, 668 struct msghdr *msg, size_t size, int flags) 669 { 670 struct sock_iocb *si = kiocb_to_siocb(iocb); 671 672 si->sock = sock; 673 si->scm = NULL; 674 si->msg = msg; 675 si->size = size; 676 si->flags = flags; 677 678 return sock->ops->recvmsg(iocb, sock, msg, size, flags); 679 } 680 681 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 682 struct msghdr *msg, size_t size, int flags) 683 { 684 int err = security_socket_recvmsg(sock, msg, size, flags); 685 686 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); 687 } 688 689 int sock_recvmsg(struct socket *sock, struct msghdr *msg, 690 size_t size, int flags) 691 { 692 struct kiocb iocb; 693 struct sock_iocb siocb; 694 int ret; 695 696 init_sync_kiocb(&iocb, NULL); 697 iocb.private = &siocb; 698 ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 699 if (-EIOCBQUEUED == ret) 700 ret = wait_on_sync_kiocb(&iocb); 701 return ret; 702 } 703 704 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 705 size_t size, int flags) 706 { 707 struct kiocb iocb; 708 struct sock_iocb siocb; 709 int ret; 710 711 init_sync_kiocb(&iocb, NULL); 712 iocb.private = &siocb; 713 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); 714 if (-EIOCBQUEUED == ret) 715 ret = wait_on_sync_kiocb(&iocb); 716 return ret; 717 } 718 719 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 720 struct kvec *vec, size_t num, size_t size, int flags) 721 { 722 mm_segment_t oldfs = get_fs(); 723 int result; 724 725 set_fs(KERNEL_DS); 726 /* 727 * the following is safe, since for compiler definitions of kvec and 728 * iovec are identical, yielding the same in-core layout and alignment 729 */ 730 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; 731 result = sock_recvmsg(sock, msg, size, flags); 732 set_fs(oldfs); 733 return result; 734 } 735 736 static void sock_aio_dtor(struct kiocb *iocb) 737 { 738 kfree(iocb->private); 739 } 740 741 static ssize_t sock_sendpage(struct file *file, struct page *page, 742 int offset, size_t size, loff_t *ppos, int more) 743 { 744 struct socket *sock; 745 int flags; 746 747 sock = file->private_data; 748 749 flags = !(file->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT; 750 if (more) 751 flags |= MSG_MORE; 752 753 return kernel_sendpage(sock, page, offset, size, flags); 754 } 755 756 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 757 struct pipe_inode_info *pipe, size_t len, 758 unsigned int flags) 759 { 760 struct socket *sock = file->private_data; 761 762 if (unlikely(!sock->ops->splice_read)) 763 return -EINVAL; 764 765 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 766 } 767 768 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 769 struct sock_iocb *siocb) 770 { 771 if (!is_sync_kiocb(iocb)) { 772 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); 773 if (!siocb) 774 return NULL; 775 iocb->ki_dtor = sock_aio_dtor; 776 } 777 778 siocb->kiocb = iocb; 779 iocb->private = siocb; 780 return siocb; 781 } 782 783 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 784 struct file *file, const struct iovec *iov, 785 unsigned long nr_segs) 786 { 787 struct socket *sock = file->private_data; 788 size_t size = 0; 789 int i; 790 791 for (i = 0; i < nr_segs; i++) 792 size += iov[i].iov_len; 793 794 msg->msg_name = NULL; 795 msg->msg_namelen = 0; 796 msg->msg_control = NULL; 797 msg->msg_controllen = 0; 798 msg->msg_iov = (struct iovec *)iov; 799 msg->msg_iovlen = nr_segs; 800 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 801 802 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 803 } 804 805 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 806 unsigned long nr_segs, loff_t pos) 807 { 808 struct sock_iocb siocb, *x; 809 810 if (pos != 0) 811 return -ESPIPE; 812 813 if (iocb->ki_left == 0) /* Match SYS5 behaviour */ 814 return 0; 815 816 817 x = alloc_sock_iocb(iocb, &siocb); 818 if (!x) 819 return -ENOMEM; 820 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 821 } 822 823 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 824 struct file *file, const struct iovec *iov, 825 unsigned long nr_segs) 826 { 827 struct socket *sock = file->private_data; 828 size_t size = 0; 829 int i; 830 831 for (i = 0; i < nr_segs; i++) 832 size += iov[i].iov_len; 833 834 msg->msg_name = NULL; 835 msg->msg_namelen = 0; 836 msg->msg_control = NULL; 837 msg->msg_controllen = 0; 838 msg->msg_iov = (struct iovec *)iov; 839 msg->msg_iovlen = nr_segs; 840 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 841 if (sock->type == SOCK_SEQPACKET) 842 msg->msg_flags |= MSG_EOR; 843 844 return __sock_sendmsg(iocb, sock, msg, size); 845 } 846 847 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 848 unsigned long nr_segs, loff_t pos) 849 { 850 struct sock_iocb siocb, *x; 851 852 if (pos != 0) 853 return -ESPIPE; 854 855 x = alloc_sock_iocb(iocb, &siocb); 856 if (!x) 857 return -ENOMEM; 858 859 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 860 } 861 862 /* 863 * Atomic setting of ioctl hooks to avoid race 864 * with module unload. 865 */ 866 867 static DEFINE_MUTEX(br_ioctl_mutex); 868 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg) = NULL; 869 870 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 871 { 872 mutex_lock(&br_ioctl_mutex); 873 br_ioctl_hook = hook; 874 mutex_unlock(&br_ioctl_mutex); 875 } 876 877 EXPORT_SYMBOL(brioctl_set); 878 879 static DEFINE_MUTEX(vlan_ioctl_mutex); 880 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 881 882 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 883 { 884 mutex_lock(&vlan_ioctl_mutex); 885 vlan_ioctl_hook = hook; 886 mutex_unlock(&vlan_ioctl_mutex); 887 } 888 889 EXPORT_SYMBOL(vlan_ioctl_set); 890 891 static DEFINE_MUTEX(dlci_ioctl_mutex); 892 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 893 894 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 895 { 896 mutex_lock(&dlci_ioctl_mutex); 897 dlci_ioctl_hook = hook; 898 mutex_unlock(&dlci_ioctl_mutex); 899 } 900 901 EXPORT_SYMBOL(dlci_ioctl_set); 902 903 static long sock_do_ioctl(struct net *net, struct socket *sock, 904 unsigned int cmd, unsigned long arg) 905 { 906 int err; 907 void __user *argp = (void __user *)arg; 908 909 err = sock->ops->ioctl(sock, cmd, arg); 910 911 /* 912 * If this ioctl is unknown try to hand it down 913 * to the NIC driver. 914 */ 915 if (err == -ENOIOCTLCMD) 916 err = dev_ioctl(net, cmd, argp); 917 918 return err; 919 } 920 921 /* 922 * With an ioctl, arg may well be a user mode pointer, but we don't know 923 * what to do with it - that's up to the protocol still. 924 */ 925 926 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 927 { 928 struct socket *sock; 929 struct sock *sk; 930 void __user *argp = (void __user *)arg; 931 int pid, err; 932 struct net *net; 933 934 sock = file->private_data; 935 sk = sock->sk; 936 net = sock_net(sk); 937 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 938 err = dev_ioctl(net, cmd, argp); 939 } else 940 #ifdef CONFIG_WEXT_CORE 941 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 942 err = dev_ioctl(net, cmd, argp); 943 } else 944 #endif 945 switch (cmd) { 946 case FIOSETOWN: 947 case SIOCSPGRP: 948 err = -EFAULT; 949 if (get_user(pid, (int __user *)argp)) 950 break; 951 err = f_setown(sock->file, pid, 1); 952 break; 953 case FIOGETOWN: 954 case SIOCGPGRP: 955 err = put_user(f_getown(sock->file), 956 (int __user *)argp); 957 break; 958 case SIOCGIFBR: 959 case SIOCSIFBR: 960 case SIOCBRADDBR: 961 case SIOCBRDELBR: 962 err = -ENOPKG; 963 if (!br_ioctl_hook) 964 request_module("bridge"); 965 966 mutex_lock(&br_ioctl_mutex); 967 if (br_ioctl_hook) 968 err = br_ioctl_hook(net, cmd, argp); 969 mutex_unlock(&br_ioctl_mutex); 970 break; 971 case SIOCGIFVLAN: 972 case SIOCSIFVLAN: 973 err = -ENOPKG; 974 if (!vlan_ioctl_hook) 975 request_module("8021q"); 976 977 mutex_lock(&vlan_ioctl_mutex); 978 if (vlan_ioctl_hook) 979 err = vlan_ioctl_hook(net, argp); 980 mutex_unlock(&vlan_ioctl_mutex); 981 break; 982 case SIOCADDDLCI: 983 case SIOCDELDLCI: 984 err = -ENOPKG; 985 if (!dlci_ioctl_hook) 986 request_module("dlci"); 987 988 mutex_lock(&dlci_ioctl_mutex); 989 if (dlci_ioctl_hook) 990 err = dlci_ioctl_hook(cmd, argp); 991 mutex_unlock(&dlci_ioctl_mutex); 992 break; 993 default: 994 err = sock_do_ioctl(net, sock, cmd, arg); 995 break; 996 } 997 return err; 998 } 999 1000 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1001 { 1002 int err; 1003 struct socket *sock = NULL; 1004 1005 err = security_socket_create(family, type, protocol, 1); 1006 if (err) 1007 goto out; 1008 1009 sock = sock_alloc(); 1010 if (!sock) { 1011 err = -ENOMEM; 1012 goto out; 1013 } 1014 1015 sock->type = type; 1016 err = security_socket_post_create(sock, family, type, protocol, 1); 1017 if (err) 1018 goto out_release; 1019 1020 out: 1021 *res = sock; 1022 return err; 1023 out_release: 1024 sock_release(sock); 1025 sock = NULL; 1026 goto out; 1027 } 1028 1029 /* No kernel lock held - perfect */ 1030 static unsigned int sock_poll(struct file *file, poll_table *wait) 1031 { 1032 struct socket *sock; 1033 1034 /* 1035 * We can't return errors to poll, so it's either yes or no. 1036 */ 1037 sock = file->private_data; 1038 return sock->ops->poll(file, sock, wait); 1039 } 1040 1041 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1042 { 1043 struct socket *sock = file->private_data; 1044 1045 return sock->ops->mmap(file, sock, vma); 1046 } 1047 1048 static int sock_close(struct inode *inode, struct file *filp) 1049 { 1050 /* 1051 * It was possible the inode is NULL we were 1052 * closing an unfinished socket. 1053 */ 1054 1055 if (!inode) { 1056 printk(KERN_DEBUG "sock_close: NULL inode\n"); 1057 return 0; 1058 } 1059 sock_release(SOCKET_I(inode)); 1060 return 0; 1061 } 1062 1063 /* 1064 * Update the socket async list 1065 * 1066 * Fasync_list locking strategy. 1067 * 1068 * 1. fasync_list is modified only under process context socket lock 1069 * i.e. under semaphore. 1070 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1071 * or under socket lock. 1072 * 3. fasync_list can be used from softirq context, so that 1073 * modification under socket lock have to be enhanced with 1074 * write_lock_bh(&sk->sk_callback_lock). 1075 * --ANK (990710) 1076 */ 1077 1078 static int sock_fasync(int fd, struct file *filp, int on) 1079 { 1080 struct fasync_struct *fa, *fna = NULL, **prev; 1081 struct socket *sock; 1082 struct sock *sk; 1083 1084 if (on) { 1085 fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL); 1086 if (fna == NULL) 1087 return -ENOMEM; 1088 } 1089 1090 sock = filp->private_data; 1091 1092 sk = sock->sk; 1093 if (sk == NULL) { 1094 kfree(fna); 1095 return -EINVAL; 1096 } 1097 1098 lock_sock(sk); 1099 1100 spin_lock(&filp->f_lock); 1101 if (on) 1102 filp->f_flags |= FASYNC; 1103 else 1104 filp->f_flags &= ~FASYNC; 1105 spin_unlock(&filp->f_lock); 1106 1107 prev = &(sock->fasync_list); 1108 1109 for (fa = *prev; fa != NULL; prev = &fa->fa_next, fa = *prev) 1110 if (fa->fa_file == filp) 1111 break; 1112 1113 if (on) { 1114 if (fa != NULL) { 1115 write_lock_bh(&sk->sk_callback_lock); 1116 fa->fa_fd = fd; 1117 write_unlock_bh(&sk->sk_callback_lock); 1118 1119 kfree(fna); 1120 goto out; 1121 } 1122 fna->fa_file = filp; 1123 fna->fa_fd = fd; 1124 fna->magic = FASYNC_MAGIC; 1125 fna->fa_next = sock->fasync_list; 1126 write_lock_bh(&sk->sk_callback_lock); 1127 sock->fasync_list = fna; 1128 sock_set_flag(sk, SOCK_FASYNC); 1129 write_unlock_bh(&sk->sk_callback_lock); 1130 } else { 1131 if (fa != NULL) { 1132 write_lock_bh(&sk->sk_callback_lock); 1133 *prev = fa->fa_next; 1134 if (!sock->fasync_list) 1135 sock_reset_flag(sk, SOCK_FASYNC); 1136 write_unlock_bh(&sk->sk_callback_lock); 1137 kfree(fa); 1138 } 1139 } 1140 1141 out: 1142 release_sock(sock->sk); 1143 return 0; 1144 } 1145 1146 /* This function may be called only under socket lock or callback_lock */ 1147 1148 int sock_wake_async(struct socket *sock, int how, int band) 1149 { 1150 if (!sock || !sock->fasync_list) 1151 return -1; 1152 switch (how) { 1153 case SOCK_WAKE_WAITD: 1154 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 1155 break; 1156 goto call_kill; 1157 case SOCK_WAKE_SPACE: 1158 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 1159 break; 1160 /* fall through */ 1161 case SOCK_WAKE_IO: 1162 call_kill: 1163 __kill_fasync(sock->fasync_list, SIGIO, band); 1164 break; 1165 case SOCK_WAKE_URG: 1166 __kill_fasync(sock->fasync_list, SIGURG, band); 1167 } 1168 return 0; 1169 } 1170 1171 static int __sock_create(struct net *net, int family, int type, int protocol, 1172 struct socket **res, int kern) 1173 { 1174 int err; 1175 struct socket *sock; 1176 const struct net_proto_family *pf; 1177 1178 /* 1179 * Check protocol is in range 1180 */ 1181 if (family < 0 || family >= NPROTO) 1182 return -EAFNOSUPPORT; 1183 if (type < 0 || type >= SOCK_MAX) 1184 return -EINVAL; 1185 1186 /* Compatibility. 1187 1188 This uglymoron is moved from INET layer to here to avoid 1189 deadlock in module load. 1190 */ 1191 if (family == PF_INET && type == SOCK_PACKET) { 1192 static int warned; 1193 if (!warned) { 1194 warned = 1; 1195 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1196 current->comm); 1197 } 1198 family = PF_PACKET; 1199 } 1200 1201 err = security_socket_create(family, type, protocol, kern); 1202 if (err) 1203 return err; 1204 1205 /* 1206 * Allocate the socket and allow the family to set things up. if 1207 * the protocol is 0, the family is instructed to select an appropriate 1208 * default. 1209 */ 1210 sock = sock_alloc(); 1211 if (!sock) { 1212 if (net_ratelimit()) 1213 printk(KERN_WARNING "socket: no more sockets\n"); 1214 return -ENFILE; /* Not exactly a match, but its the 1215 closest posix thing */ 1216 } 1217 1218 sock->type = type; 1219 1220 #ifdef CONFIG_MODULES 1221 /* Attempt to load a protocol module if the find failed. 1222 * 1223 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1224 * requested real, full-featured networking support upon configuration. 1225 * Otherwise module support will break! 1226 */ 1227 if (net_families[family] == NULL) 1228 request_module("net-pf-%d", family); 1229 #endif 1230 1231 rcu_read_lock(); 1232 pf = rcu_dereference(net_families[family]); 1233 err = -EAFNOSUPPORT; 1234 if (!pf) 1235 goto out_release; 1236 1237 /* 1238 * We will call the ->create function, that possibly is in a loadable 1239 * module, so we have to bump that loadable module refcnt first. 1240 */ 1241 if (!try_module_get(pf->owner)) 1242 goto out_release; 1243 1244 /* Now protected by module ref count */ 1245 rcu_read_unlock(); 1246 1247 err = pf->create(net, sock, protocol, kern); 1248 if (err < 0) 1249 goto out_module_put; 1250 1251 /* 1252 * Now to bump the refcnt of the [loadable] module that owns this 1253 * socket at sock_release time we decrement its refcnt. 1254 */ 1255 if (!try_module_get(sock->ops->owner)) 1256 goto out_module_busy; 1257 1258 /* 1259 * Now that we're done with the ->create function, the [loadable] 1260 * module can have its refcnt decremented 1261 */ 1262 module_put(pf->owner); 1263 err = security_socket_post_create(sock, family, type, protocol, kern); 1264 if (err) 1265 goto out_sock_release; 1266 *res = sock; 1267 1268 return 0; 1269 1270 out_module_busy: 1271 err = -EAFNOSUPPORT; 1272 out_module_put: 1273 sock->ops = NULL; 1274 module_put(pf->owner); 1275 out_sock_release: 1276 sock_release(sock); 1277 return err; 1278 1279 out_release: 1280 rcu_read_unlock(); 1281 goto out_sock_release; 1282 } 1283 1284 int sock_create(int family, int type, int protocol, struct socket **res) 1285 { 1286 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1287 } 1288 1289 int sock_create_kern(int family, int type, int protocol, struct socket **res) 1290 { 1291 return __sock_create(&init_net, family, type, protocol, res, 1); 1292 } 1293 1294 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1295 { 1296 int retval; 1297 struct socket *sock; 1298 int flags; 1299 1300 /* Check the SOCK_* constants for consistency. */ 1301 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1302 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1303 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1304 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1305 1306 flags = type & ~SOCK_TYPE_MASK; 1307 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1308 return -EINVAL; 1309 type &= SOCK_TYPE_MASK; 1310 1311 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1312 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1313 1314 retval = sock_create(family, type, protocol, &sock); 1315 if (retval < 0) 1316 goto out; 1317 1318 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1319 if (retval < 0) 1320 goto out_release; 1321 1322 out: 1323 /* It may be already another descriptor 8) Not kernel problem. */ 1324 return retval; 1325 1326 out_release: 1327 sock_release(sock); 1328 return retval; 1329 } 1330 1331 /* 1332 * Create a pair of connected sockets. 1333 */ 1334 1335 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1336 int __user *, usockvec) 1337 { 1338 struct socket *sock1, *sock2; 1339 int fd1, fd2, err; 1340 struct file *newfile1, *newfile2; 1341 int flags; 1342 1343 flags = type & ~SOCK_TYPE_MASK; 1344 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1345 return -EINVAL; 1346 type &= SOCK_TYPE_MASK; 1347 1348 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1349 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1350 1351 /* 1352 * Obtain the first socket and check if the underlying protocol 1353 * supports the socketpair call. 1354 */ 1355 1356 err = sock_create(family, type, protocol, &sock1); 1357 if (err < 0) 1358 goto out; 1359 1360 err = sock_create(family, type, protocol, &sock2); 1361 if (err < 0) 1362 goto out_release_1; 1363 1364 err = sock1->ops->socketpair(sock1, sock2); 1365 if (err < 0) 1366 goto out_release_both; 1367 1368 fd1 = sock_alloc_file(sock1, &newfile1, flags); 1369 if (unlikely(fd1 < 0)) { 1370 err = fd1; 1371 goto out_release_both; 1372 } 1373 1374 fd2 = sock_alloc_file(sock2, &newfile2, flags); 1375 if (unlikely(fd2 < 0)) { 1376 err = fd2; 1377 fput(newfile1); 1378 put_unused_fd(fd1); 1379 sock_release(sock2); 1380 goto out; 1381 } 1382 1383 audit_fd_pair(fd1, fd2); 1384 fd_install(fd1, newfile1); 1385 fd_install(fd2, newfile2); 1386 /* fd1 and fd2 may be already another descriptors. 1387 * Not kernel problem. 1388 */ 1389 1390 err = put_user(fd1, &usockvec[0]); 1391 if (!err) 1392 err = put_user(fd2, &usockvec[1]); 1393 if (!err) 1394 return 0; 1395 1396 sys_close(fd2); 1397 sys_close(fd1); 1398 return err; 1399 1400 out_release_both: 1401 sock_release(sock2); 1402 out_release_1: 1403 sock_release(sock1); 1404 out: 1405 return err; 1406 } 1407 1408 /* 1409 * Bind a name to a socket. Nothing much to do here since it's 1410 * the protocol's responsibility to handle the local address. 1411 * 1412 * We move the socket address to kernel space before we call 1413 * the protocol layer (having also checked the address is ok). 1414 */ 1415 1416 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1417 { 1418 struct socket *sock; 1419 struct sockaddr_storage address; 1420 int err, fput_needed; 1421 1422 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1423 if (sock) { 1424 err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address); 1425 if (err >= 0) { 1426 err = security_socket_bind(sock, 1427 (struct sockaddr *)&address, 1428 addrlen); 1429 if (!err) 1430 err = sock->ops->bind(sock, 1431 (struct sockaddr *) 1432 &address, addrlen); 1433 } 1434 fput_light(sock->file, fput_needed); 1435 } 1436 return err; 1437 } 1438 1439 /* 1440 * Perform a listen. Basically, we allow the protocol to do anything 1441 * necessary for a listen, and if that works, we mark the socket as 1442 * ready for listening. 1443 */ 1444 1445 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1446 { 1447 struct socket *sock; 1448 int err, fput_needed; 1449 int somaxconn; 1450 1451 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1452 if (sock) { 1453 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1454 if ((unsigned)backlog > somaxconn) 1455 backlog = somaxconn; 1456 1457 err = security_socket_listen(sock, backlog); 1458 if (!err) 1459 err = sock->ops->listen(sock, backlog); 1460 1461 fput_light(sock->file, fput_needed); 1462 } 1463 return err; 1464 } 1465 1466 /* 1467 * For accept, we attempt to create a new socket, set up the link 1468 * with the client, wake up the client, then return the new 1469 * connected fd. We collect the address of the connector in kernel 1470 * space and move it to user at the very end. This is unclean because 1471 * we open the socket then return an error. 1472 * 1473 * 1003.1g adds the ability to recvmsg() to query connection pending 1474 * status to recvmsg. We need to add that support in a way thats 1475 * clean when we restucture accept also. 1476 */ 1477 1478 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1479 int __user *, upeer_addrlen, int, flags) 1480 { 1481 struct socket *sock, *newsock; 1482 struct file *newfile; 1483 int err, len, newfd, fput_needed; 1484 struct sockaddr_storage address; 1485 1486 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1487 return -EINVAL; 1488 1489 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1490 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1491 1492 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1493 if (!sock) 1494 goto out; 1495 1496 err = -ENFILE; 1497 if (!(newsock = sock_alloc())) 1498 goto out_put; 1499 1500 newsock->type = sock->type; 1501 newsock->ops = sock->ops; 1502 1503 /* 1504 * We don't need try_module_get here, as the listening socket (sock) 1505 * has the protocol module (sock->ops->owner) held. 1506 */ 1507 __module_get(newsock->ops->owner); 1508 1509 newfd = sock_alloc_file(newsock, &newfile, flags); 1510 if (unlikely(newfd < 0)) { 1511 err = newfd; 1512 sock_release(newsock); 1513 goto out_put; 1514 } 1515 1516 err = security_socket_accept(sock, newsock); 1517 if (err) 1518 goto out_fd; 1519 1520 err = sock->ops->accept(sock, newsock, sock->file->f_flags); 1521 if (err < 0) 1522 goto out_fd; 1523 1524 if (upeer_sockaddr) { 1525 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1526 &len, 2) < 0) { 1527 err = -ECONNABORTED; 1528 goto out_fd; 1529 } 1530 err = move_addr_to_user((struct sockaddr *)&address, 1531 len, upeer_sockaddr, upeer_addrlen); 1532 if (err < 0) 1533 goto out_fd; 1534 } 1535 1536 /* File flags are not inherited via accept() unlike another OSes. */ 1537 1538 fd_install(newfd, newfile); 1539 err = newfd; 1540 1541 out_put: 1542 fput_light(sock->file, fput_needed); 1543 out: 1544 return err; 1545 out_fd: 1546 fput(newfile); 1547 put_unused_fd(newfd); 1548 goto out_put; 1549 } 1550 1551 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1552 int __user *, upeer_addrlen) 1553 { 1554 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1555 } 1556 1557 /* 1558 * Attempt to connect to a socket with the server address. The address 1559 * is in user space so we verify it is OK and move it to kernel space. 1560 * 1561 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1562 * break bindings 1563 * 1564 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1565 * other SEQPACKET protocols that take time to connect() as it doesn't 1566 * include the -EINPROGRESS status for such sockets. 1567 */ 1568 1569 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1570 int, addrlen) 1571 { 1572 struct socket *sock; 1573 struct sockaddr_storage address; 1574 int err, fput_needed; 1575 1576 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1577 if (!sock) 1578 goto out; 1579 err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address); 1580 if (err < 0) 1581 goto out_put; 1582 1583 err = 1584 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1585 if (err) 1586 goto out_put; 1587 1588 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1589 sock->file->f_flags); 1590 out_put: 1591 fput_light(sock->file, fput_needed); 1592 out: 1593 return err; 1594 } 1595 1596 /* 1597 * Get the local address ('name') of a socket object. Move the obtained 1598 * name to user space. 1599 */ 1600 1601 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1602 int __user *, usockaddr_len) 1603 { 1604 struct socket *sock; 1605 struct sockaddr_storage address; 1606 int len, err, fput_needed; 1607 1608 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1609 if (!sock) 1610 goto out; 1611 1612 err = security_socket_getsockname(sock); 1613 if (err) 1614 goto out_put; 1615 1616 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1617 if (err) 1618 goto out_put; 1619 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len); 1620 1621 out_put: 1622 fput_light(sock->file, fput_needed); 1623 out: 1624 return err; 1625 } 1626 1627 /* 1628 * Get the remote address ('name') of a socket object. Move the obtained 1629 * name to user space. 1630 */ 1631 1632 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1633 int __user *, usockaddr_len) 1634 { 1635 struct socket *sock; 1636 struct sockaddr_storage address; 1637 int len, err, fput_needed; 1638 1639 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1640 if (sock != NULL) { 1641 err = security_socket_getpeername(sock); 1642 if (err) { 1643 fput_light(sock->file, fput_needed); 1644 return err; 1645 } 1646 1647 err = 1648 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1649 1); 1650 if (!err) 1651 err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, 1652 usockaddr_len); 1653 fput_light(sock->file, fput_needed); 1654 } 1655 return err; 1656 } 1657 1658 /* 1659 * Send a datagram to a given address. We move the address into kernel 1660 * space and check the user space data area is readable before invoking 1661 * the protocol. 1662 */ 1663 1664 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1665 unsigned, flags, struct sockaddr __user *, addr, 1666 int, addr_len) 1667 { 1668 struct socket *sock; 1669 struct sockaddr_storage address; 1670 int err; 1671 struct msghdr msg; 1672 struct iovec iov; 1673 int fput_needed; 1674 1675 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1676 if (!sock) 1677 goto out; 1678 1679 iov.iov_base = buff; 1680 iov.iov_len = len; 1681 msg.msg_name = NULL; 1682 msg.msg_iov = &iov; 1683 msg.msg_iovlen = 1; 1684 msg.msg_control = NULL; 1685 msg.msg_controllen = 0; 1686 msg.msg_namelen = 0; 1687 if (addr) { 1688 err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address); 1689 if (err < 0) 1690 goto out_put; 1691 msg.msg_name = (struct sockaddr *)&address; 1692 msg.msg_namelen = addr_len; 1693 } 1694 if (sock->file->f_flags & O_NONBLOCK) 1695 flags |= MSG_DONTWAIT; 1696 msg.msg_flags = flags; 1697 err = sock_sendmsg(sock, &msg, len); 1698 1699 out_put: 1700 fput_light(sock->file, fput_needed); 1701 out: 1702 return err; 1703 } 1704 1705 /* 1706 * Send a datagram down a socket. 1707 */ 1708 1709 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1710 unsigned, flags) 1711 { 1712 return sys_sendto(fd, buff, len, flags, NULL, 0); 1713 } 1714 1715 /* 1716 * Receive a frame from the socket and optionally record the address of the 1717 * sender. We verify the buffers are writable and if needed move the 1718 * sender address from kernel to user space. 1719 */ 1720 1721 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1722 unsigned, flags, struct sockaddr __user *, addr, 1723 int __user *, addr_len) 1724 { 1725 struct socket *sock; 1726 struct iovec iov; 1727 struct msghdr msg; 1728 struct sockaddr_storage address; 1729 int err, err2; 1730 int fput_needed; 1731 1732 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1733 if (!sock) 1734 goto out; 1735 1736 msg.msg_control = NULL; 1737 msg.msg_controllen = 0; 1738 msg.msg_iovlen = 1; 1739 msg.msg_iov = &iov; 1740 iov.iov_len = size; 1741 iov.iov_base = ubuf; 1742 msg.msg_name = (struct sockaddr *)&address; 1743 msg.msg_namelen = sizeof(address); 1744 if (sock->file->f_flags & O_NONBLOCK) 1745 flags |= MSG_DONTWAIT; 1746 err = sock_recvmsg(sock, &msg, size, flags); 1747 1748 if (err >= 0 && addr != NULL) { 1749 err2 = move_addr_to_user((struct sockaddr *)&address, 1750 msg.msg_namelen, addr, addr_len); 1751 if (err2 < 0) 1752 err = err2; 1753 } 1754 1755 fput_light(sock->file, fput_needed); 1756 out: 1757 return err; 1758 } 1759 1760 /* 1761 * Receive a datagram from a socket. 1762 */ 1763 1764 asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, 1765 unsigned flags) 1766 { 1767 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1768 } 1769 1770 /* 1771 * Set a socket option. Because we don't know the option lengths we have 1772 * to pass the user mode parameter for the protocols to sort out. 1773 */ 1774 1775 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1776 char __user *, optval, int, optlen) 1777 { 1778 int err, fput_needed; 1779 struct socket *sock; 1780 1781 if (optlen < 0) 1782 return -EINVAL; 1783 1784 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1785 if (sock != NULL) { 1786 err = security_socket_setsockopt(sock, level, optname); 1787 if (err) 1788 goto out_put; 1789 1790 if (level == SOL_SOCKET) 1791 err = 1792 sock_setsockopt(sock, level, optname, optval, 1793 optlen); 1794 else 1795 err = 1796 sock->ops->setsockopt(sock, level, optname, optval, 1797 optlen); 1798 out_put: 1799 fput_light(sock->file, fput_needed); 1800 } 1801 return err; 1802 } 1803 1804 /* 1805 * Get a socket option. Because we don't know the option lengths we have 1806 * to pass a user mode parameter for the protocols to sort out. 1807 */ 1808 1809 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1810 char __user *, optval, int __user *, optlen) 1811 { 1812 int err, fput_needed; 1813 struct socket *sock; 1814 1815 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1816 if (sock != NULL) { 1817 err = security_socket_getsockopt(sock, level, optname); 1818 if (err) 1819 goto out_put; 1820 1821 if (level == SOL_SOCKET) 1822 err = 1823 sock_getsockopt(sock, level, optname, optval, 1824 optlen); 1825 else 1826 err = 1827 sock->ops->getsockopt(sock, level, optname, optval, 1828 optlen); 1829 out_put: 1830 fput_light(sock->file, fput_needed); 1831 } 1832 return err; 1833 } 1834 1835 /* 1836 * Shutdown a socket. 1837 */ 1838 1839 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1840 { 1841 int err, fput_needed; 1842 struct socket *sock; 1843 1844 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1845 if (sock != NULL) { 1846 err = security_socket_shutdown(sock, how); 1847 if (!err) 1848 err = sock->ops->shutdown(sock, how); 1849 fput_light(sock->file, fput_needed); 1850 } 1851 return err; 1852 } 1853 1854 /* A couple of helpful macros for getting the address of the 32/64 bit 1855 * fields which are the same type (int / unsigned) on our platforms. 1856 */ 1857 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1858 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1859 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1860 1861 /* 1862 * BSD sendmsg interface 1863 */ 1864 1865 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags) 1866 { 1867 struct compat_msghdr __user *msg_compat = 1868 (struct compat_msghdr __user *)msg; 1869 struct socket *sock; 1870 struct sockaddr_storage address; 1871 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1872 unsigned char ctl[sizeof(struct cmsghdr) + 20] 1873 __attribute__ ((aligned(sizeof(__kernel_size_t)))); 1874 /* 20 is size of ipv6_pktinfo */ 1875 unsigned char *ctl_buf = ctl; 1876 struct msghdr msg_sys; 1877 int err, ctl_len, iov_size, total_len; 1878 int fput_needed; 1879 1880 err = -EFAULT; 1881 if (MSG_CMSG_COMPAT & flags) { 1882 if (get_compat_msghdr(&msg_sys, msg_compat)) 1883 return -EFAULT; 1884 } 1885 else if (copy_from_user(&msg_sys, msg, sizeof(struct msghdr))) 1886 return -EFAULT; 1887 1888 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1889 if (!sock) 1890 goto out; 1891 1892 /* do not move before msg_sys is valid */ 1893 err = -EMSGSIZE; 1894 if (msg_sys.msg_iovlen > UIO_MAXIOV) 1895 goto out_put; 1896 1897 /* Check whether to allocate the iovec area */ 1898 err = -ENOMEM; 1899 iov_size = msg_sys.msg_iovlen * sizeof(struct iovec); 1900 if (msg_sys.msg_iovlen > UIO_FASTIOV) { 1901 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 1902 if (!iov) 1903 goto out_put; 1904 } 1905 1906 /* This will also move the address data into kernel space */ 1907 if (MSG_CMSG_COMPAT & flags) { 1908 err = verify_compat_iovec(&msg_sys, iov, 1909 (struct sockaddr *)&address, 1910 VERIFY_READ); 1911 } else 1912 err = verify_iovec(&msg_sys, iov, 1913 (struct sockaddr *)&address, 1914 VERIFY_READ); 1915 if (err < 0) 1916 goto out_freeiov; 1917 total_len = err; 1918 1919 err = -ENOBUFS; 1920 1921 if (msg_sys.msg_controllen > INT_MAX) 1922 goto out_freeiov; 1923 ctl_len = msg_sys.msg_controllen; 1924 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 1925 err = 1926 cmsghdr_from_user_compat_to_kern(&msg_sys, sock->sk, ctl, 1927 sizeof(ctl)); 1928 if (err) 1929 goto out_freeiov; 1930 ctl_buf = msg_sys.msg_control; 1931 ctl_len = msg_sys.msg_controllen; 1932 } else if (ctl_len) { 1933 if (ctl_len > sizeof(ctl)) { 1934 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 1935 if (ctl_buf == NULL) 1936 goto out_freeiov; 1937 } 1938 err = -EFAULT; 1939 /* 1940 * Careful! Before this, msg_sys.msg_control contains a user pointer. 1941 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 1942 * checking falls down on this. 1943 */ 1944 if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control, 1945 ctl_len)) 1946 goto out_freectl; 1947 msg_sys.msg_control = ctl_buf; 1948 } 1949 msg_sys.msg_flags = flags; 1950 1951 if (sock->file->f_flags & O_NONBLOCK) 1952 msg_sys.msg_flags |= MSG_DONTWAIT; 1953 err = sock_sendmsg(sock, &msg_sys, total_len); 1954 1955 out_freectl: 1956 if (ctl_buf != ctl) 1957 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 1958 out_freeiov: 1959 if (iov != iovstack) 1960 sock_kfree_s(sock->sk, iov, iov_size); 1961 out_put: 1962 fput_light(sock->file, fput_needed); 1963 out: 1964 return err; 1965 } 1966 1967 static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg, 1968 struct msghdr *msg_sys, unsigned flags, int nosec) 1969 { 1970 struct compat_msghdr __user *msg_compat = 1971 (struct compat_msghdr __user *)msg; 1972 struct iovec iovstack[UIO_FASTIOV]; 1973 struct iovec *iov = iovstack; 1974 unsigned long cmsg_ptr; 1975 int err, iov_size, total_len, len; 1976 1977 /* kernel mode address */ 1978 struct sockaddr_storage addr; 1979 1980 /* user mode address pointers */ 1981 struct sockaddr __user *uaddr; 1982 int __user *uaddr_len; 1983 1984 if (MSG_CMSG_COMPAT & flags) { 1985 if (get_compat_msghdr(msg_sys, msg_compat)) 1986 return -EFAULT; 1987 } 1988 else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) 1989 return -EFAULT; 1990 1991 err = -EMSGSIZE; 1992 if (msg_sys->msg_iovlen > UIO_MAXIOV) 1993 goto out; 1994 1995 /* Check whether to allocate the iovec area */ 1996 err = -ENOMEM; 1997 iov_size = msg_sys->msg_iovlen * sizeof(struct iovec); 1998 if (msg_sys->msg_iovlen > UIO_FASTIOV) { 1999 iov = sock_kmalloc(sock->sk, iov_size, GFP_KERNEL); 2000 if (!iov) 2001 goto out; 2002 } 2003 2004 /* 2005 * Save the user-mode address (verify_iovec will change the 2006 * kernel msghdr to use the kernel address space) 2007 */ 2008 2009 uaddr = (__force void __user *)msg_sys->msg_name; 2010 uaddr_len = COMPAT_NAMELEN(msg); 2011 if (MSG_CMSG_COMPAT & flags) { 2012 err = verify_compat_iovec(msg_sys, iov, 2013 (struct sockaddr *)&addr, 2014 VERIFY_WRITE); 2015 } else 2016 err = verify_iovec(msg_sys, iov, 2017 (struct sockaddr *)&addr, 2018 VERIFY_WRITE); 2019 if (err < 0) 2020 goto out_freeiov; 2021 total_len = err; 2022 2023 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2024 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2025 2026 if (sock->file->f_flags & O_NONBLOCK) 2027 flags |= MSG_DONTWAIT; 2028 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, 2029 total_len, flags); 2030 if (err < 0) 2031 goto out_freeiov; 2032 len = err; 2033 2034 if (uaddr != NULL) { 2035 err = move_addr_to_user((struct sockaddr *)&addr, 2036 msg_sys->msg_namelen, uaddr, 2037 uaddr_len); 2038 if (err < 0) 2039 goto out_freeiov; 2040 } 2041 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2042 COMPAT_FLAGS(msg)); 2043 if (err) 2044 goto out_freeiov; 2045 if (MSG_CMSG_COMPAT & flags) 2046 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2047 &msg_compat->msg_controllen); 2048 else 2049 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2050 &msg->msg_controllen); 2051 if (err) 2052 goto out_freeiov; 2053 err = len; 2054 2055 out_freeiov: 2056 if (iov != iovstack) 2057 sock_kfree_s(sock->sk, iov, iov_size); 2058 out: 2059 return err; 2060 } 2061 2062 /* 2063 * BSD recvmsg interface 2064 */ 2065 2066 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, 2067 unsigned int, flags) 2068 { 2069 int fput_needed, err; 2070 struct msghdr msg_sys; 2071 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); 2072 2073 if (!sock) 2074 goto out; 2075 2076 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2077 2078 fput_light(sock->file, fput_needed); 2079 out: 2080 return err; 2081 } 2082 2083 /* 2084 * Linux recvmmsg interface 2085 */ 2086 2087 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2088 unsigned int flags, struct timespec *timeout) 2089 { 2090 int fput_needed, err, datagrams; 2091 struct socket *sock; 2092 struct mmsghdr __user *entry; 2093 struct compat_mmsghdr __user *compat_entry; 2094 struct msghdr msg_sys; 2095 struct timespec end_time; 2096 2097 if (timeout && 2098 poll_select_set_timeout(&end_time, timeout->tv_sec, 2099 timeout->tv_nsec)) 2100 return -EINVAL; 2101 2102 datagrams = 0; 2103 2104 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2105 if (!sock) 2106 return err; 2107 2108 err = sock_error(sock->sk); 2109 if (err) 2110 goto out_put; 2111 2112 entry = mmsg; 2113 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2114 2115 while (datagrams < vlen) { 2116 /* 2117 * No need to ask LSM for more than the first datagram. 2118 */ 2119 if (MSG_CMSG_COMPAT & flags) { 2120 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry, 2121 &msg_sys, flags, datagrams); 2122 if (err < 0) 2123 break; 2124 err = __put_user(err, &compat_entry->msg_len); 2125 ++compat_entry; 2126 } else { 2127 err = __sys_recvmsg(sock, (struct msghdr __user *)entry, 2128 &msg_sys, flags, datagrams); 2129 if (err < 0) 2130 break; 2131 err = put_user(err, &entry->msg_len); 2132 ++entry; 2133 } 2134 2135 if (err) 2136 break; 2137 ++datagrams; 2138 2139 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2140 if (flags & MSG_WAITFORONE) 2141 flags |= MSG_DONTWAIT; 2142 2143 if (timeout) { 2144 ktime_get_ts(timeout); 2145 *timeout = timespec_sub(end_time, *timeout); 2146 if (timeout->tv_sec < 0) { 2147 timeout->tv_sec = timeout->tv_nsec = 0; 2148 break; 2149 } 2150 2151 /* Timeout, return less than vlen datagrams */ 2152 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2153 break; 2154 } 2155 2156 /* Out of band data, return right away */ 2157 if (msg_sys.msg_flags & MSG_OOB) 2158 break; 2159 } 2160 2161 out_put: 2162 fput_light(sock->file, fput_needed); 2163 2164 if (err == 0) 2165 return datagrams; 2166 2167 if (datagrams != 0) { 2168 /* 2169 * We may return less entries than requested (vlen) if the 2170 * sock is non block and there aren't enough datagrams... 2171 */ 2172 if (err != -EAGAIN) { 2173 /* 2174 * ... or if recvmsg returns an error after we 2175 * received some datagrams, where we record the 2176 * error to return on the next call or if the 2177 * app asks about it using getsockopt(SO_ERROR). 2178 */ 2179 sock->sk->sk_err = -err; 2180 } 2181 2182 return datagrams; 2183 } 2184 2185 return err; 2186 } 2187 2188 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2189 unsigned int, vlen, unsigned int, flags, 2190 struct timespec __user *, timeout) 2191 { 2192 int datagrams; 2193 struct timespec timeout_sys; 2194 2195 if (!timeout) 2196 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2197 2198 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2199 return -EFAULT; 2200 2201 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2202 2203 if (datagrams > 0 && 2204 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2205 datagrams = -EFAULT; 2206 2207 return datagrams; 2208 } 2209 2210 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2211 /* Argument list sizes for sys_socketcall */ 2212 #define AL(x) ((x) * sizeof(unsigned long)) 2213 static const unsigned char nargs[20] = { 2214 AL(0),AL(3),AL(3),AL(3),AL(2),AL(3), 2215 AL(3),AL(3),AL(4),AL(4),AL(4),AL(6), 2216 AL(6),AL(2),AL(5),AL(5),AL(3),AL(3), 2217 AL(4),AL(5) 2218 }; 2219 2220 #undef AL 2221 2222 /* 2223 * System call vectors. 2224 * 2225 * Argument checking cleaned up. Saved 20% in size. 2226 * This function doesn't need to set the kernel lock because 2227 * it is set by the callees. 2228 */ 2229 2230 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2231 { 2232 unsigned long a[6]; 2233 unsigned long a0, a1; 2234 int err; 2235 unsigned int len; 2236 2237 if (call < 1 || call > SYS_RECVMMSG) 2238 return -EINVAL; 2239 2240 len = nargs[call]; 2241 if (len > sizeof(a)) 2242 return -EINVAL; 2243 2244 /* copy_from_user should be SMP safe. */ 2245 if (copy_from_user(a, args, len)) 2246 return -EFAULT; 2247 2248 audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2249 2250 a0 = a[0]; 2251 a1 = a[1]; 2252 2253 switch (call) { 2254 case SYS_SOCKET: 2255 err = sys_socket(a0, a1, a[2]); 2256 break; 2257 case SYS_BIND: 2258 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2259 break; 2260 case SYS_CONNECT: 2261 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2262 break; 2263 case SYS_LISTEN: 2264 err = sys_listen(a0, a1); 2265 break; 2266 case SYS_ACCEPT: 2267 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2268 (int __user *)a[2], 0); 2269 break; 2270 case SYS_GETSOCKNAME: 2271 err = 2272 sys_getsockname(a0, (struct sockaddr __user *)a1, 2273 (int __user *)a[2]); 2274 break; 2275 case SYS_GETPEERNAME: 2276 err = 2277 sys_getpeername(a0, (struct sockaddr __user *)a1, 2278 (int __user *)a[2]); 2279 break; 2280 case SYS_SOCKETPAIR: 2281 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2282 break; 2283 case SYS_SEND: 2284 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2285 break; 2286 case SYS_SENDTO: 2287 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2288 (struct sockaddr __user *)a[4], a[5]); 2289 break; 2290 case SYS_RECV: 2291 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2292 break; 2293 case SYS_RECVFROM: 2294 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2295 (struct sockaddr __user *)a[4], 2296 (int __user *)a[5]); 2297 break; 2298 case SYS_SHUTDOWN: 2299 err = sys_shutdown(a0, a1); 2300 break; 2301 case SYS_SETSOCKOPT: 2302 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2303 break; 2304 case SYS_GETSOCKOPT: 2305 err = 2306 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2307 (int __user *)a[4]); 2308 break; 2309 case SYS_SENDMSG: 2310 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); 2311 break; 2312 case SYS_RECVMSG: 2313 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); 2314 break; 2315 case SYS_RECVMMSG: 2316 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2317 (struct timespec __user *)a[4]); 2318 break; 2319 case SYS_ACCEPT4: 2320 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2321 (int __user *)a[2], a[3]); 2322 break; 2323 default: 2324 err = -EINVAL; 2325 break; 2326 } 2327 return err; 2328 } 2329 2330 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2331 2332 /** 2333 * sock_register - add a socket protocol handler 2334 * @ops: description of protocol 2335 * 2336 * This function is called by a protocol handler that wants to 2337 * advertise its address family, and have it linked into the 2338 * socket interface. The value ops->family coresponds to the 2339 * socket system call protocol family. 2340 */ 2341 int sock_register(const struct net_proto_family *ops) 2342 { 2343 int err; 2344 2345 if (ops->family >= NPROTO) { 2346 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, 2347 NPROTO); 2348 return -ENOBUFS; 2349 } 2350 2351 spin_lock(&net_family_lock); 2352 if (net_families[ops->family]) 2353 err = -EEXIST; 2354 else { 2355 net_families[ops->family] = ops; 2356 err = 0; 2357 } 2358 spin_unlock(&net_family_lock); 2359 2360 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); 2361 return err; 2362 } 2363 2364 /** 2365 * sock_unregister - remove a protocol handler 2366 * @family: protocol family to remove 2367 * 2368 * This function is called by a protocol handler that wants to 2369 * remove its address family, and have it unlinked from the 2370 * new socket creation. 2371 * 2372 * If protocol handler is a module, then it can use module reference 2373 * counts to protect against new references. If protocol handler is not 2374 * a module then it needs to provide its own protection in 2375 * the ops->create routine. 2376 */ 2377 void sock_unregister(int family) 2378 { 2379 BUG_ON(family < 0 || family >= NPROTO); 2380 2381 spin_lock(&net_family_lock); 2382 net_families[family] = NULL; 2383 spin_unlock(&net_family_lock); 2384 2385 synchronize_rcu(); 2386 2387 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); 2388 } 2389 2390 static int __init sock_init(void) 2391 { 2392 /* 2393 * Initialize sock SLAB cache. 2394 */ 2395 2396 sk_init(); 2397 2398 /* 2399 * Initialize skbuff SLAB cache 2400 */ 2401 skb_init(); 2402 2403 /* 2404 * Initialize the protocols module. 2405 */ 2406 2407 init_inodecache(); 2408 register_filesystem(&sock_fs_type); 2409 sock_mnt = kern_mount(&sock_fs_type); 2410 2411 /* The real protocol initialization is performed in later initcalls. 2412 */ 2413 2414 #ifdef CONFIG_NETFILTER 2415 netfilter_init(); 2416 #endif 2417 2418 return 0; 2419 } 2420 2421 core_initcall(sock_init); /* early initcall */ 2422 2423 #ifdef CONFIG_PROC_FS 2424 void socket_seq_show(struct seq_file *seq) 2425 { 2426 int cpu; 2427 int counter = 0; 2428 2429 for_each_possible_cpu(cpu) 2430 counter += per_cpu(sockets_in_use, cpu); 2431 2432 /* It can be negative, by the way. 8) */ 2433 if (counter < 0) 2434 counter = 0; 2435 2436 seq_printf(seq, "sockets: used %d\n", counter); 2437 } 2438 #endif /* CONFIG_PROC_FS */ 2439 2440 #ifdef CONFIG_COMPAT 2441 static int do_siocgstamp(struct net *net, struct socket *sock, 2442 unsigned int cmd, struct compat_timeval __user *up) 2443 { 2444 mm_segment_t old_fs = get_fs(); 2445 struct timeval ktv; 2446 int err; 2447 2448 set_fs(KERNEL_DS); 2449 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2450 set_fs(old_fs); 2451 if (!err) { 2452 err = put_user(ktv.tv_sec, &up->tv_sec); 2453 err |= __put_user(ktv.tv_usec, &up->tv_usec); 2454 } 2455 return err; 2456 } 2457 2458 static int do_siocgstampns(struct net *net, struct socket *sock, 2459 unsigned int cmd, struct compat_timespec __user *up) 2460 { 2461 mm_segment_t old_fs = get_fs(); 2462 struct timespec kts; 2463 int err; 2464 2465 set_fs(KERNEL_DS); 2466 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2467 set_fs(old_fs); 2468 if (!err) { 2469 err = put_user(kts.tv_sec, &up->tv_sec); 2470 err |= __put_user(kts.tv_nsec, &up->tv_nsec); 2471 } 2472 return err; 2473 } 2474 2475 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2476 { 2477 struct ifreq __user *uifr; 2478 int err; 2479 2480 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2481 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2482 return -EFAULT; 2483 2484 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2485 if (err) 2486 return err; 2487 2488 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2489 return -EFAULT; 2490 2491 return 0; 2492 } 2493 2494 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2495 { 2496 struct compat_ifconf ifc32; 2497 struct ifconf ifc; 2498 struct ifconf __user *uifc; 2499 struct compat_ifreq __user *ifr32; 2500 struct ifreq __user *ifr; 2501 unsigned int i, j; 2502 int err; 2503 2504 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2505 return -EFAULT; 2506 2507 if (ifc32.ifcbuf == 0) { 2508 ifc32.ifc_len = 0; 2509 ifc.ifc_len = 0; 2510 ifc.ifc_req = NULL; 2511 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2512 } else { 2513 size_t len =((ifc32.ifc_len / sizeof (struct compat_ifreq)) + 1) * 2514 sizeof (struct ifreq); 2515 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2516 ifc.ifc_len = len; 2517 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2518 ifr32 = compat_ptr(ifc32.ifcbuf); 2519 for (i = 0; i < ifc32.ifc_len; i += sizeof (struct compat_ifreq)) { 2520 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2521 return -EFAULT; 2522 ifr++; 2523 ifr32++; 2524 } 2525 } 2526 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2527 return -EFAULT; 2528 2529 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2530 if (err) 2531 return err; 2532 2533 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2534 return -EFAULT; 2535 2536 ifr = ifc.ifc_req; 2537 ifr32 = compat_ptr(ifc32.ifcbuf); 2538 for (i = 0, j = 0; 2539 i + sizeof (struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2540 i += sizeof (struct compat_ifreq), j += sizeof (struct ifreq)) { 2541 if (copy_in_user(ifr32, ifr, sizeof (struct compat_ifreq))) 2542 return -EFAULT; 2543 ifr32++; 2544 ifr++; 2545 } 2546 2547 if (ifc32.ifcbuf == 0) { 2548 /* Translate from 64-bit structure multiple to 2549 * a 32-bit one. 2550 */ 2551 i = ifc.ifc_len; 2552 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2553 ifc32.ifc_len = i; 2554 } else { 2555 ifc32.ifc_len = i; 2556 } 2557 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2558 return -EFAULT; 2559 2560 return 0; 2561 } 2562 2563 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2564 { 2565 struct ifreq __user *ifr; 2566 u32 data; 2567 void __user *datap; 2568 2569 ifr = compat_alloc_user_space(sizeof(*ifr)); 2570 2571 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2572 return -EFAULT; 2573 2574 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2575 return -EFAULT; 2576 2577 datap = compat_ptr(data); 2578 if (put_user(datap, &ifr->ifr_ifru.ifru_data)) 2579 return -EFAULT; 2580 2581 return dev_ioctl(net, SIOCETHTOOL, ifr); 2582 } 2583 2584 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2585 { 2586 void __user *uptr; 2587 compat_uptr_t uptr32; 2588 struct ifreq __user *uifr; 2589 2590 uifr = compat_alloc_user_space(sizeof (*uifr)); 2591 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2592 return -EFAULT; 2593 2594 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2595 return -EFAULT; 2596 2597 uptr = compat_ptr(uptr32); 2598 2599 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2600 return -EFAULT; 2601 2602 return dev_ioctl(net, SIOCWANDEV, uifr); 2603 } 2604 2605 static int bond_ioctl(struct net *net, unsigned int cmd, 2606 struct compat_ifreq __user *ifr32) 2607 { 2608 struct ifreq kifr; 2609 struct ifreq __user *uifr; 2610 mm_segment_t old_fs; 2611 int err; 2612 u32 data; 2613 void __user *datap; 2614 2615 switch (cmd) { 2616 case SIOCBONDENSLAVE: 2617 case SIOCBONDRELEASE: 2618 case SIOCBONDSETHWADDR: 2619 case SIOCBONDCHANGEACTIVE: 2620 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 2621 return -EFAULT; 2622 2623 old_fs = get_fs(); 2624 set_fs (KERNEL_DS); 2625 err = dev_ioctl(net, cmd, &kifr); 2626 set_fs (old_fs); 2627 2628 return err; 2629 case SIOCBONDSLAVEINFOQUERY: 2630 case SIOCBONDINFOQUERY: 2631 uifr = compat_alloc_user_space(sizeof(*uifr)); 2632 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2633 return -EFAULT; 2634 2635 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2636 return -EFAULT; 2637 2638 datap = compat_ptr(data); 2639 if (put_user(datap, &uifr->ifr_ifru.ifru_data)) 2640 return -EFAULT; 2641 2642 return dev_ioctl(net, cmd, uifr); 2643 default: 2644 return -EINVAL; 2645 }; 2646 } 2647 2648 static int siocdevprivate_ioctl(struct net *net, unsigned int cmd, 2649 struct compat_ifreq __user *u_ifreq32) 2650 { 2651 struct ifreq __user *u_ifreq64; 2652 char tmp_buf[IFNAMSIZ]; 2653 void __user *data64; 2654 u32 data32; 2655 2656 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 2657 IFNAMSIZ)) 2658 return -EFAULT; 2659 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 2660 return -EFAULT; 2661 data64 = compat_ptr(data32); 2662 2663 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 2664 2665 /* Don't check these user accesses, just let that get trapped 2666 * in the ioctl handler instead. 2667 */ 2668 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 2669 IFNAMSIZ)) 2670 return -EFAULT; 2671 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 2672 return -EFAULT; 2673 2674 return dev_ioctl(net, cmd, u_ifreq64); 2675 } 2676 2677 static int dev_ifsioc(struct net *net, struct socket *sock, 2678 unsigned int cmd, struct compat_ifreq __user *uifr32) 2679 { 2680 struct ifreq __user *uifr; 2681 int err; 2682 2683 uifr = compat_alloc_user_space(sizeof(*uifr)); 2684 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 2685 return -EFAULT; 2686 2687 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 2688 2689 if (!err) { 2690 switch (cmd) { 2691 case SIOCGIFFLAGS: 2692 case SIOCGIFMETRIC: 2693 case SIOCGIFMTU: 2694 case SIOCGIFMEM: 2695 case SIOCGIFHWADDR: 2696 case SIOCGIFINDEX: 2697 case SIOCGIFADDR: 2698 case SIOCGIFBRDADDR: 2699 case SIOCGIFDSTADDR: 2700 case SIOCGIFNETMASK: 2701 case SIOCGIFPFLAGS: 2702 case SIOCGIFTXQLEN: 2703 case SIOCGMIIPHY: 2704 case SIOCGMIIREG: 2705 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 2706 err = -EFAULT; 2707 break; 2708 } 2709 } 2710 return err; 2711 } 2712 2713 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 2714 struct compat_ifreq __user *uifr32) 2715 { 2716 struct ifreq ifr; 2717 struct compat_ifmap __user *uifmap32; 2718 mm_segment_t old_fs; 2719 int err; 2720 2721 uifmap32 = &uifr32->ifr_ifru.ifru_map; 2722 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 2723 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2724 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2725 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2726 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq); 2727 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma); 2728 err |= __get_user(ifr.ifr_map.port, &uifmap32->port); 2729 if (err) 2730 return -EFAULT; 2731 2732 old_fs = get_fs(); 2733 set_fs (KERNEL_DS); 2734 err = dev_ioctl(net, cmd, (void __user *)&ifr); 2735 set_fs (old_fs); 2736 2737 if (cmd == SIOCGIFMAP && !err) { 2738 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 2739 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2740 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2741 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2742 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq); 2743 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma); 2744 err |= __put_user(ifr.ifr_map.port, &uifmap32->port); 2745 if (err) 2746 err = -EFAULT; 2747 } 2748 return err; 2749 } 2750 2751 static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32) 2752 { 2753 void __user *uptr; 2754 compat_uptr_t uptr32; 2755 struct ifreq __user *uifr; 2756 2757 uifr = compat_alloc_user_space(sizeof (*uifr)); 2758 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2759 return -EFAULT; 2760 2761 if (get_user(uptr32, &uifr32->ifr_data)) 2762 return -EFAULT; 2763 2764 uptr = compat_ptr(uptr32); 2765 2766 if (put_user(uptr, &uifr->ifr_data)) 2767 return -EFAULT; 2768 2769 return dev_ioctl(net, SIOCSHWTSTAMP, uifr); 2770 } 2771 2772 struct rtentry32 { 2773 u32 rt_pad1; 2774 struct sockaddr rt_dst; /* target address */ 2775 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 2776 struct sockaddr rt_genmask; /* target network mask (IP) */ 2777 unsigned short rt_flags; 2778 short rt_pad2; 2779 u32 rt_pad3; 2780 unsigned char rt_tos; 2781 unsigned char rt_class; 2782 short rt_pad4; 2783 short rt_metric; /* +1 for binary compatibility! */ 2784 /* char * */ u32 rt_dev; /* forcing the device at add */ 2785 u32 rt_mtu; /* per route MTU/Window */ 2786 u32 rt_window; /* Window clamping */ 2787 unsigned short rt_irtt; /* Initial RTT */ 2788 }; 2789 2790 struct in6_rtmsg32 { 2791 struct in6_addr rtmsg_dst; 2792 struct in6_addr rtmsg_src; 2793 struct in6_addr rtmsg_gateway; 2794 u32 rtmsg_type; 2795 u16 rtmsg_dst_len; 2796 u16 rtmsg_src_len; 2797 u32 rtmsg_metric; 2798 u32 rtmsg_info; 2799 u32 rtmsg_flags; 2800 s32 rtmsg_ifindex; 2801 }; 2802 2803 static int routing_ioctl(struct net *net, struct socket *sock, 2804 unsigned int cmd, void __user *argp) 2805 { 2806 int ret; 2807 void *r = NULL; 2808 struct in6_rtmsg r6; 2809 struct rtentry r4; 2810 char devname[16]; 2811 u32 rtdev; 2812 mm_segment_t old_fs = get_fs(); 2813 2814 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 2815 struct in6_rtmsg32 __user *ur6 = argp; 2816 ret = copy_from_user (&r6.rtmsg_dst, &(ur6->rtmsg_dst), 2817 3 * sizeof(struct in6_addr)); 2818 ret |= __get_user (r6.rtmsg_type, &(ur6->rtmsg_type)); 2819 ret |= __get_user (r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 2820 ret |= __get_user (r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 2821 ret |= __get_user (r6.rtmsg_metric, &(ur6->rtmsg_metric)); 2822 ret |= __get_user (r6.rtmsg_info, &(ur6->rtmsg_info)); 2823 ret |= __get_user (r6.rtmsg_flags, &(ur6->rtmsg_flags)); 2824 ret |= __get_user (r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 2825 2826 r = (void *) &r6; 2827 } else { /* ipv4 */ 2828 struct rtentry32 __user *ur4 = argp; 2829 ret = copy_from_user (&r4.rt_dst, &(ur4->rt_dst), 2830 3 * sizeof(struct sockaddr)); 2831 ret |= __get_user (r4.rt_flags, &(ur4->rt_flags)); 2832 ret |= __get_user (r4.rt_metric, &(ur4->rt_metric)); 2833 ret |= __get_user (r4.rt_mtu, &(ur4->rt_mtu)); 2834 ret |= __get_user (r4.rt_window, &(ur4->rt_window)); 2835 ret |= __get_user (r4.rt_irtt, &(ur4->rt_irtt)); 2836 ret |= __get_user (rtdev, &(ur4->rt_dev)); 2837 if (rtdev) { 2838 ret |= copy_from_user (devname, compat_ptr(rtdev), 15); 2839 r4.rt_dev = devname; devname[15] = 0; 2840 } else 2841 r4.rt_dev = NULL; 2842 2843 r = (void *) &r4; 2844 } 2845 2846 if (ret) { 2847 ret = -EFAULT; 2848 goto out; 2849 } 2850 2851 set_fs (KERNEL_DS); 2852 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 2853 set_fs (old_fs); 2854 2855 out: 2856 return ret; 2857 } 2858 2859 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 2860 * for some operations; this forces use of the newer bridge-utils that 2861 * use compatiable ioctls 2862 */ 2863 static int old_bridge_ioctl(compat_ulong_t __user *argp) 2864 { 2865 compat_ulong_t tmp; 2866 2867 if (get_user(tmp, argp)) 2868 return -EFAULT; 2869 if (tmp == BRCTL_GET_VERSION) 2870 return BRCTL_VERSION + 1; 2871 return -EINVAL; 2872 } 2873 2874 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 2875 unsigned int cmd, unsigned long arg) 2876 { 2877 void __user *argp = compat_ptr(arg); 2878 struct sock *sk = sock->sk; 2879 struct net *net = sock_net(sk); 2880 2881 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 2882 return siocdevprivate_ioctl(net, cmd, argp); 2883 2884 switch (cmd) { 2885 case SIOCSIFBR: 2886 case SIOCGIFBR: 2887 return old_bridge_ioctl(argp); 2888 case SIOCGIFNAME: 2889 return dev_ifname32(net, argp); 2890 case SIOCGIFCONF: 2891 return dev_ifconf(net, argp); 2892 case SIOCETHTOOL: 2893 return ethtool_ioctl(net, argp); 2894 case SIOCWANDEV: 2895 return compat_siocwandev(net, argp); 2896 case SIOCGIFMAP: 2897 case SIOCSIFMAP: 2898 return compat_sioc_ifmap(net, cmd, argp); 2899 case SIOCBONDENSLAVE: 2900 case SIOCBONDRELEASE: 2901 case SIOCBONDSETHWADDR: 2902 case SIOCBONDSLAVEINFOQUERY: 2903 case SIOCBONDINFOQUERY: 2904 case SIOCBONDCHANGEACTIVE: 2905 return bond_ioctl(net, cmd, argp); 2906 case SIOCADDRT: 2907 case SIOCDELRT: 2908 return routing_ioctl(net, sock, cmd, argp); 2909 case SIOCGSTAMP: 2910 return do_siocgstamp(net, sock, cmd, argp); 2911 case SIOCGSTAMPNS: 2912 return do_siocgstampns(net, sock, cmd, argp); 2913 case SIOCSHWTSTAMP: 2914 return compat_siocshwtstamp(net, argp); 2915 2916 case FIOSETOWN: 2917 case SIOCSPGRP: 2918 case FIOGETOWN: 2919 case SIOCGPGRP: 2920 case SIOCBRADDBR: 2921 case SIOCBRDELBR: 2922 case SIOCGIFVLAN: 2923 case SIOCSIFVLAN: 2924 case SIOCADDDLCI: 2925 case SIOCDELDLCI: 2926 return sock_ioctl(file, cmd, arg); 2927 2928 case SIOCGIFFLAGS: 2929 case SIOCSIFFLAGS: 2930 case SIOCGIFMETRIC: 2931 case SIOCSIFMETRIC: 2932 case SIOCGIFMTU: 2933 case SIOCSIFMTU: 2934 case SIOCGIFMEM: 2935 case SIOCSIFMEM: 2936 case SIOCGIFHWADDR: 2937 case SIOCSIFHWADDR: 2938 case SIOCADDMULTI: 2939 case SIOCDELMULTI: 2940 case SIOCGIFINDEX: 2941 case SIOCGIFADDR: 2942 case SIOCSIFADDR: 2943 case SIOCSIFHWBROADCAST: 2944 case SIOCDIFADDR: 2945 case SIOCGIFBRDADDR: 2946 case SIOCSIFBRDADDR: 2947 case SIOCGIFDSTADDR: 2948 case SIOCSIFDSTADDR: 2949 case SIOCGIFNETMASK: 2950 case SIOCSIFNETMASK: 2951 case SIOCSIFPFLAGS: 2952 case SIOCGIFPFLAGS: 2953 case SIOCGIFTXQLEN: 2954 case SIOCSIFTXQLEN: 2955 case SIOCBRADDIF: 2956 case SIOCBRDELIF: 2957 case SIOCSIFNAME: 2958 case SIOCGMIIPHY: 2959 case SIOCGMIIREG: 2960 case SIOCSMIIREG: 2961 return dev_ifsioc(net, sock, cmd, argp); 2962 2963 case SIOCSARP: 2964 case SIOCGARP: 2965 case SIOCDARP: 2966 case SIOCATMARK: 2967 return sock_do_ioctl(net, sock, cmd, arg); 2968 } 2969 2970 /* Prevent warning from compat_sys_ioctl, these always 2971 * result in -EINVAL in the native case anyway. */ 2972 switch (cmd) { 2973 case SIOCRTMSG: 2974 case SIOCGIFCOUNT: 2975 case SIOCSRARP: 2976 case SIOCGRARP: 2977 case SIOCDRARP: 2978 case SIOCSIFLINK: 2979 case SIOCGIFSLAVE: 2980 case SIOCSIFSLAVE: 2981 return -EINVAL; 2982 } 2983 2984 return -ENOIOCTLCMD; 2985 } 2986 2987 static long compat_sock_ioctl(struct file *file, unsigned cmd, 2988 unsigned long arg) 2989 { 2990 struct socket *sock = file->private_data; 2991 int ret = -ENOIOCTLCMD; 2992 struct sock *sk; 2993 struct net *net; 2994 2995 sk = sock->sk; 2996 net = sock_net(sk); 2997 2998 if (sock->ops->compat_ioctl) 2999 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3000 3001 if (ret == -ENOIOCTLCMD && 3002 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3003 ret = compat_wext_handle_ioctl(net, cmd, arg); 3004 3005 if (ret == -ENOIOCTLCMD) 3006 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3007 3008 return ret; 3009 } 3010 #endif 3011 3012 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3013 { 3014 return sock->ops->bind(sock, addr, addrlen); 3015 } 3016 3017 int kernel_listen(struct socket *sock, int backlog) 3018 { 3019 return sock->ops->listen(sock, backlog); 3020 } 3021 3022 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3023 { 3024 struct sock *sk = sock->sk; 3025 int err; 3026 3027 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3028 newsock); 3029 if (err < 0) 3030 goto done; 3031 3032 err = sock->ops->accept(sock, *newsock, flags); 3033 if (err < 0) { 3034 sock_release(*newsock); 3035 *newsock = NULL; 3036 goto done; 3037 } 3038 3039 (*newsock)->ops = sock->ops; 3040 __module_get((*newsock)->ops->owner); 3041 3042 done: 3043 return err; 3044 } 3045 3046 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3047 int flags) 3048 { 3049 return sock->ops->connect(sock, addr, addrlen, flags); 3050 } 3051 3052 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3053 int *addrlen) 3054 { 3055 return sock->ops->getname(sock, addr, addrlen, 0); 3056 } 3057 3058 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3059 int *addrlen) 3060 { 3061 return sock->ops->getname(sock, addr, addrlen, 1); 3062 } 3063 3064 int kernel_getsockopt(struct socket *sock, int level, int optname, 3065 char *optval, int *optlen) 3066 { 3067 mm_segment_t oldfs = get_fs(); 3068 int err; 3069 3070 set_fs(KERNEL_DS); 3071 if (level == SOL_SOCKET) 3072 err = sock_getsockopt(sock, level, optname, optval, optlen); 3073 else 3074 err = sock->ops->getsockopt(sock, level, optname, optval, 3075 optlen); 3076 set_fs(oldfs); 3077 return err; 3078 } 3079 3080 int kernel_setsockopt(struct socket *sock, int level, int optname, 3081 char *optval, unsigned int optlen) 3082 { 3083 mm_segment_t oldfs = get_fs(); 3084 int err; 3085 3086 set_fs(KERNEL_DS); 3087 if (level == SOL_SOCKET) 3088 err = sock_setsockopt(sock, level, optname, optval, optlen); 3089 else 3090 err = sock->ops->setsockopt(sock, level, optname, optval, 3091 optlen); 3092 set_fs(oldfs); 3093 return err; 3094 } 3095 3096 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3097 size_t size, int flags) 3098 { 3099 if (sock->ops->sendpage) 3100 return sock->ops->sendpage(sock, page, offset, size, flags); 3101 3102 return sock_no_sendpage(sock, page, offset, size, flags); 3103 } 3104 3105 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3106 { 3107 mm_segment_t oldfs = get_fs(); 3108 int err; 3109 3110 set_fs(KERNEL_DS); 3111 err = sock->ops->ioctl(sock, cmd, arg); 3112 set_fs(oldfs); 3113 3114 return err; 3115 } 3116 3117 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3118 { 3119 return sock->ops->shutdown(sock, how); 3120 } 3121 3122 EXPORT_SYMBOL(sock_create); 3123 EXPORT_SYMBOL(sock_create_kern); 3124 EXPORT_SYMBOL(sock_create_lite); 3125 EXPORT_SYMBOL(sock_map_fd); 3126 EXPORT_SYMBOL(sock_recvmsg); 3127 EXPORT_SYMBOL(sock_register); 3128 EXPORT_SYMBOL(sock_release); 3129 EXPORT_SYMBOL(sock_sendmsg); 3130 EXPORT_SYMBOL(sock_unregister); 3131 EXPORT_SYMBOL(sock_wake_async); 3132 EXPORT_SYMBOL(sockfd_lookup); 3133 EXPORT_SYMBOL(kernel_sendmsg); 3134 EXPORT_SYMBOL(kernel_recvmsg); 3135 EXPORT_SYMBOL(kernel_bind); 3136 EXPORT_SYMBOL(kernel_listen); 3137 EXPORT_SYMBOL(kernel_accept); 3138 EXPORT_SYMBOL(kernel_connect); 3139 EXPORT_SYMBOL(kernel_getsockname); 3140 EXPORT_SYMBOL(kernel_getpeername); 3141 EXPORT_SYMBOL(kernel_getsockopt); 3142 EXPORT_SYMBOL(kernel_setsockopt); 3143 EXPORT_SYMBOL(kernel_sendpage); 3144 EXPORT_SYMBOL(kernel_sock_ioctl); 3145 EXPORT_SYMBOL(kernel_sock_shutdown); 3146