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