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/if_bridge.h> 73 #include <linux/if_frad.h> 74 #include <linux/if_vlan.h> 75 #include <linux/init.h> 76 #include <linux/poll.h> 77 #include <linux/cache.h> 78 #include <linux/module.h> 79 #include <linux/highmem.h> 80 #include <linux/mount.h> 81 #include <linux/security.h> 82 #include <linux/syscalls.h> 83 #include <linux/compat.h> 84 #include <linux/kmod.h> 85 #include <linux/audit.h> 86 #include <linux/wireless.h> 87 #include <linux/nsproxy.h> 88 #include <linux/magic.h> 89 #include <linux/slab.h> 90 #include <linux/xattr.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 __rcu *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); 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 /** 174 * move_addr_to_kernel - copy a socket address into kernel space 175 * @uaddr: Address in user space 176 * @kaddr: Address in kernel space 177 * @ulen: Length in user space 178 * 179 * The address is copied into kernel space. If the provided address is 180 * too long an error code of -EINVAL is returned. If the copy gives 181 * invalid addresses -EFAULT is returned. On a success 0 is returned. 182 */ 183 184 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 185 { 186 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 187 return -EINVAL; 188 if (ulen == 0) 189 return 0; 190 if (copy_from_user(kaddr, uaddr, ulen)) 191 return -EFAULT; 192 return audit_sockaddr(ulen, kaddr); 193 } 194 195 /** 196 * move_addr_to_user - copy an address to user space 197 * @kaddr: kernel space address 198 * @klen: length of address in kernel 199 * @uaddr: user space address 200 * @ulen: pointer to user length field 201 * 202 * The value pointed to by ulen on entry is the buffer length available. 203 * This is overwritten with the buffer space used. -EINVAL is returned 204 * if an overlong buffer is specified or a negative buffer size. -EFAULT 205 * is returned if either the buffer or the length field are not 206 * accessible. 207 * After copying the data up to the limit the user specifies, the true 208 * length of the data is written over the length limit the user 209 * specified. Zero is returned for a success. 210 */ 211 212 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 213 void __user *uaddr, int __user *ulen) 214 { 215 int err; 216 int len; 217 218 err = get_user(len, ulen); 219 if (err) 220 return err; 221 if (len > klen) 222 len = klen; 223 if (len < 0 || len > sizeof(struct sockaddr_storage)) 224 return -EINVAL; 225 if (len) { 226 if (audit_sockaddr(klen, kaddr)) 227 return -ENOMEM; 228 if (copy_to_user(uaddr, kaddr, len)) 229 return -EFAULT; 230 } 231 /* 232 * "fromlen shall refer to the value before truncation.." 233 * 1003.1g 234 */ 235 return __put_user(klen, ulen); 236 } 237 238 static struct kmem_cache *sock_inode_cachep __read_mostly; 239 240 static struct inode *sock_alloc_inode(struct super_block *sb) 241 { 242 struct socket_alloc *ei; 243 struct socket_wq *wq; 244 245 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 246 if (!ei) 247 return NULL; 248 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 249 if (!wq) { 250 kmem_cache_free(sock_inode_cachep, ei); 251 return NULL; 252 } 253 init_waitqueue_head(&wq->wait); 254 wq->fasync_list = NULL; 255 RCU_INIT_POINTER(ei->socket.wq, wq); 256 257 ei->socket.state = SS_UNCONNECTED; 258 ei->socket.flags = 0; 259 ei->socket.ops = NULL; 260 ei->socket.sk = NULL; 261 ei->socket.file = NULL; 262 263 return &ei->vfs_inode; 264 } 265 266 static void sock_destroy_inode(struct inode *inode) 267 { 268 struct socket_alloc *ei; 269 struct socket_wq *wq; 270 271 ei = container_of(inode, struct socket_alloc, vfs_inode); 272 wq = rcu_dereference_protected(ei->socket.wq, 1); 273 kfree_rcu(wq, rcu); 274 kmem_cache_free(sock_inode_cachep, ei); 275 } 276 277 static void init_once(void *foo) 278 { 279 struct socket_alloc *ei = (struct socket_alloc *)foo; 280 281 inode_init_once(&ei->vfs_inode); 282 } 283 284 static int init_inodecache(void) 285 { 286 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 287 sizeof(struct socket_alloc), 288 0, 289 (SLAB_HWCACHE_ALIGN | 290 SLAB_RECLAIM_ACCOUNT | 291 SLAB_MEM_SPREAD), 292 init_once); 293 if (sock_inode_cachep == NULL) 294 return -ENOMEM; 295 return 0; 296 } 297 298 static const struct super_operations sockfs_ops = { 299 .alloc_inode = sock_alloc_inode, 300 .destroy_inode = sock_destroy_inode, 301 .statfs = simple_statfs, 302 }; 303 304 /* 305 * sockfs_dname() is called from d_path(). 306 */ 307 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 308 { 309 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 310 dentry->d_inode->i_ino); 311 } 312 313 static const struct dentry_operations sockfs_dentry_operations = { 314 .d_dname = sockfs_dname, 315 }; 316 317 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 318 int flags, const char *dev_name, void *data) 319 { 320 return mount_pseudo(fs_type, "socket:", &sockfs_ops, 321 &sockfs_dentry_operations, SOCKFS_MAGIC); 322 } 323 324 static struct vfsmount *sock_mnt __read_mostly; 325 326 static struct file_system_type sock_fs_type = { 327 .name = "sockfs", 328 .mount = sockfs_mount, 329 .kill_sb = kill_anon_super, 330 }; 331 332 /* 333 * Obtains the first available file descriptor and sets it up for use. 334 * 335 * These functions create file structures and maps them to fd space 336 * of the current process. On success it returns file descriptor 337 * and file struct implicitly stored in sock->file. 338 * Note that another thread may close file descriptor before we return 339 * from this function. We use the fact that now we do not refer 340 * to socket after mapping. If one day we will need it, this 341 * function will increment ref. count on file by 1. 342 * 343 * In any case returned fd MAY BE not valid! 344 * This race condition is unavoidable 345 * with shared fd spaces, we cannot solve it inside kernel, 346 * but we take care of internal coherence yet. 347 */ 348 349 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 350 { 351 struct qstr name = { .name = "" }; 352 struct path path; 353 struct file *file; 354 355 if (dname) { 356 name.name = dname; 357 name.len = strlen(name.name); 358 } else if (sock->sk) { 359 name.name = sock->sk->sk_prot_creator->name; 360 name.len = strlen(name.name); 361 } 362 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 363 if (unlikely(!path.dentry)) 364 return ERR_PTR(-ENOMEM); 365 path.mnt = mntget(sock_mnt); 366 367 d_instantiate(path.dentry, SOCK_INODE(sock)); 368 SOCK_INODE(sock)->i_fop = &socket_file_ops; 369 370 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 371 &socket_file_ops); 372 if (unlikely(IS_ERR(file))) { 373 /* drop dentry, keep inode */ 374 ihold(path.dentry->d_inode); 375 path_put(&path); 376 return file; 377 } 378 379 sock->file = file; 380 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 381 file->private_data = sock; 382 return file; 383 } 384 EXPORT_SYMBOL(sock_alloc_file); 385 386 static int sock_map_fd(struct socket *sock, int flags) 387 { 388 struct file *newfile; 389 int fd = get_unused_fd_flags(flags); 390 if (unlikely(fd < 0)) 391 return fd; 392 393 newfile = sock_alloc_file(sock, flags, NULL); 394 if (likely(!IS_ERR(newfile))) { 395 fd_install(fd, newfile); 396 return fd; 397 } 398 399 put_unused_fd(fd); 400 return PTR_ERR(newfile); 401 } 402 403 struct socket *sock_from_file(struct file *file, int *err) 404 { 405 if (file->f_op == &socket_file_ops) 406 return file->private_data; /* set in sock_map_fd */ 407 408 *err = -ENOTSOCK; 409 return NULL; 410 } 411 EXPORT_SYMBOL(sock_from_file); 412 413 /** 414 * sockfd_lookup - Go from a file number to its socket slot 415 * @fd: file handle 416 * @err: pointer to an error code return 417 * 418 * The file handle passed in is locked and the socket it is bound 419 * too is returned. If an error occurs the err pointer is overwritten 420 * with a negative errno code and NULL is returned. The function checks 421 * for both invalid handles and passing a handle which is not a socket. 422 * 423 * On a success the socket object pointer is returned. 424 */ 425 426 struct socket *sockfd_lookup(int fd, int *err) 427 { 428 struct file *file; 429 struct socket *sock; 430 431 file = fget(fd); 432 if (!file) { 433 *err = -EBADF; 434 return NULL; 435 } 436 437 sock = sock_from_file(file, err); 438 if (!sock) 439 fput(file); 440 return sock; 441 } 442 EXPORT_SYMBOL(sockfd_lookup); 443 444 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 445 { 446 struct file *file; 447 struct socket *sock; 448 449 *err = -EBADF; 450 file = fget_light(fd, fput_needed); 451 if (file) { 452 sock = sock_from_file(file, err); 453 if (sock) 454 return sock; 455 fput_light(file, *fput_needed); 456 } 457 return NULL; 458 } 459 460 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 461 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 462 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 463 static ssize_t sockfs_getxattr(struct dentry *dentry, 464 const char *name, void *value, size_t size) 465 { 466 const char *proto_name; 467 size_t proto_size; 468 int error; 469 470 error = -ENODATA; 471 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { 472 proto_name = dentry->d_name.name; 473 proto_size = strlen(proto_name); 474 475 if (value) { 476 error = -ERANGE; 477 if (proto_size + 1 > size) 478 goto out; 479 480 strncpy(value, proto_name, proto_size + 1); 481 } 482 error = proto_size + 1; 483 } 484 485 out: 486 return error; 487 } 488 489 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 490 size_t size) 491 { 492 ssize_t len; 493 ssize_t used = 0; 494 495 len = security_inode_listsecurity(dentry->d_inode, buffer, size); 496 if (len < 0) 497 return len; 498 used += len; 499 if (buffer) { 500 if (size < used) 501 return -ERANGE; 502 buffer += len; 503 } 504 505 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 506 used += len; 507 if (buffer) { 508 if (size < used) 509 return -ERANGE; 510 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 511 buffer += len; 512 } 513 514 return used; 515 } 516 517 static const struct inode_operations sockfs_inode_ops = { 518 .getxattr = sockfs_getxattr, 519 .listxattr = sockfs_listxattr, 520 }; 521 522 /** 523 * sock_alloc - allocate a socket 524 * 525 * Allocate a new inode and socket object. The two are bound together 526 * and initialised. The socket is then returned. If we are out of inodes 527 * NULL is returned. 528 */ 529 530 static struct socket *sock_alloc(void) 531 { 532 struct inode *inode; 533 struct socket *sock; 534 535 inode = new_inode_pseudo(sock_mnt->mnt_sb); 536 if (!inode) 537 return NULL; 538 539 sock = SOCKET_I(inode); 540 541 kmemcheck_annotate_bitfield(sock, type); 542 inode->i_ino = get_next_ino(); 543 inode->i_mode = S_IFSOCK | S_IRWXUGO; 544 inode->i_uid = current_fsuid(); 545 inode->i_gid = current_fsgid(); 546 inode->i_op = &sockfs_inode_ops; 547 548 this_cpu_add(sockets_in_use, 1); 549 return sock; 550 } 551 552 /* 553 * In theory you can't get an open on this inode, but /proc provides 554 * a back door. Remember to keep it shut otherwise you'll let the 555 * creepy crawlies in. 556 */ 557 558 static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 559 { 560 return -ENXIO; 561 } 562 563 const struct file_operations bad_sock_fops = { 564 .owner = THIS_MODULE, 565 .open = sock_no_open, 566 .llseek = noop_llseek, 567 }; 568 569 /** 570 * sock_release - close a socket 571 * @sock: socket to close 572 * 573 * The socket is released from the protocol stack if it has a release 574 * callback, and the inode is then released if the socket is bound to 575 * an inode not a file. 576 */ 577 578 void sock_release(struct socket *sock) 579 { 580 if (sock->ops) { 581 struct module *owner = sock->ops->owner; 582 583 sock->ops->release(sock); 584 sock->ops = NULL; 585 module_put(owner); 586 } 587 588 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 589 printk(KERN_ERR "sock_release: fasync list not empty!\n"); 590 591 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags)) 592 return; 593 594 this_cpu_sub(sockets_in_use, 1); 595 if (!sock->file) { 596 iput(SOCK_INODE(sock)); 597 return; 598 } 599 sock->file = NULL; 600 } 601 EXPORT_SYMBOL(sock_release); 602 603 int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags) 604 { 605 *tx_flags = 0; 606 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 607 *tx_flags |= SKBTX_HW_TSTAMP; 608 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 609 *tx_flags |= SKBTX_SW_TSTAMP; 610 if (sock_flag(sk, SOCK_WIFI_STATUS)) 611 *tx_flags |= SKBTX_WIFI_STATUS; 612 return 0; 613 } 614 EXPORT_SYMBOL(sock_tx_timestamp); 615 616 static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock, 617 struct msghdr *msg, size_t size) 618 { 619 struct sock_iocb *si = kiocb_to_siocb(iocb); 620 621 si->sock = sock; 622 si->scm = NULL; 623 si->msg = msg; 624 si->size = size; 625 626 return sock->ops->sendmsg(iocb, sock, msg, size); 627 } 628 629 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 630 struct msghdr *msg, size_t size) 631 { 632 int err = security_socket_sendmsg(sock, msg, size); 633 634 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size); 635 } 636 637 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 638 { 639 struct kiocb iocb; 640 struct sock_iocb siocb; 641 int ret; 642 643 init_sync_kiocb(&iocb, NULL); 644 iocb.private = &siocb; 645 ret = __sock_sendmsg(&iocb, sock, msg, size); 646 if (-EIOCBQUEUED == ret) 647 ret = wait_on_sync_kiocb(&iocb); 648 return ret; 649 } 650 EXPORT_SYMBOL(sock_sendmsg); 651 652 static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size) 653 { 654 struct kiocb iocb; 655 struct sock_iocb siocb; 656 int ret; 657 658 init_sync_kiocb(&iocb, NULL); 659 iocb.private = &siocb; 660 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size); 661 if (-EIOCBQUEUED == ret) 662 ret = wait_on_sync_kiocb(&iocb); 663 return ret; 664 } 665 666 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 667 struct kvec *vec, size_t num, size_t size) 668 { 669 mm_segment_t oldfs = get_fs(); 670 int result; 671 672 set_fs(KERNEL_DS); 673 /* 674 * the following is safe, since for compiler definitions of kvec and 675 * iovec are identical, yielding the same in-core layout and alignment 676 */ 677 msg->msg_iov = (struct iovec *)vec; 678 msg->msg_iovlen = num; 679 result = sock_sendmsg(sock, msg, size); 680 set_fs(oldfs); 681 return result; 682 } 683 EXPORT_SYMBOL(kernel_sendmsg); 684 685 static int ktime2ts(ktime_t kt, struct timespec *ts) 686 { 687 if (kt.tv64) { 688 *ts = ktime_to_timespec(kt); 689 return 1; 690 } else { 691 return 0; 692 } 693 } 694 695 /* 696 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 697 */ 698 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 699 struct sk_buff *skb) 700 { 701 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 702 struct timespec ts[3]; 703 int empty = 1; 704 struct skb_shared_hwtstamps *shhwtstamps = 705 skb_hwtstamps(skb); 706 707 /* Race occurred between timestamp enabling and packet 708 receiving. Fill in the current time for now. */ 709 if (need_software_tstamp && skb->tstamp.tv64 == 0) 710 __net_timestamp(skb); 711 712 if (need_software_tstamp) { 713 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 714 struct timeval tv; 715 skb_get_timestamp(skb, &tv); 716 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 717 sizeof(tv), &tv); 718 } else { 719 skb_get_timestampns(skb, &ts[0]); 720 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 721 sizeof(ts[0]), &ts[0]); 722 } 723 } 724 725 726 memset(ts, 0, sizeof(ts)); 727 if (skb->tstamp.tv64 && 728 sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) { 729 skb_get_timestampns(skb, ts + 0); 730 empty = 0; 731 } 732 if (shhwtstamps) { 733 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE) && 734 ktime2ts(shhwtstamps->syststamp, ts + 1)) 735 empty = 0; 736 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE) && 737 ktime2ts(shhwtstamps->hwtstamp, ts + 2)) 738 empty = 0; 739 } 740 if (!empty) 741 put_cmsg(msg, SOL_SOCKET, 742 SCM_TIMESTAMPING, sizeof(ts), &ts); 743 } 744 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 745 746 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 747 struct sk_buff *skb) 748 { 749 int ack; 750 751 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 752 return; 753 if (!skb->wifi_acked_valid) 754 return; 755 756 ack = skb->wifi_acked; 757 758 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 759 } 760 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 761 762 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 763 struct sk_buff *skb) 764 { 765 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) 766 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 767 sizeof(__u32), &skb->dropcount); 768 } 769 770 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 771 struct sk_buff *skb) 772 { 773 sock_recv_timestamp(msg, sk, skb); 774 sock_recv_drops(msg, sk, skb); 775 } 776 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 777 778 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, 779 struct msghdr *msg, size_t size, int flags) 780 { 781 struct sock_iocb *si = kiocb_to_siocb(iocb); 782 783 si->sock = sock; 784 si->scm = NULL; 785 si->msg = msg; 786 si->size = size; 787 si->flags = flags; 788 789 return sock->ops->recvmsg(iocb, sock, msg, size, flags); 790 } 791 792 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 793 struct msghdr *msg, size_t size, int flags) 794 { 795 int err = security_socket_recvmsg(sock, msg, size, flags); 796 797 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); 798 } 799 800 int sock_recvmsg(struct socket *sock, struct msghdr *msg, 801 size_t size, int flags) 802 { 803 struct kiocb iocb; 804 struct sock_iocb siocb; 805 int ret; 806 807 init_sync_kiocb(&iocb, NULL); 808 iocb.private = &siocb; 809 ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 810 if (-EIOCBQUEUED == ret) 811 ret = wait_on_sync_kiocb(&iocb); 812 return ret; 813 } 814 EXPORT_SYMBOL(sock_recvmsg); 815 816 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 817 size_t size, int flags) 818 { 819 struct kiocb iocb; 820 struct sock_iocb siocb; 821 int ret; 822 823 init_sync_kiocb(&iocb, NULL); 824 iocb.private = &siocb; 825 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); 826 if (-EIOCBQUEUED == ret) 827 ret = wait_on_sync_kiocb(&iocb); 828 return ret; 829 } 830 831 /** 832 * kernel_recvmsg - Receive a message from a socket (kernel space) 833 * @sock: The socket to receive the message from 834 * @msg: Received message 835 * @vec: Input s/g array for message data 836 * @num: Size of input s/g array 837 * @size: Number of bytes to read 838 * @flags: Message flags (MSG_DONTWAIT, etc...) 839 * 840 * On return the msg structure contains the scatter/gather array passed in the 841 * vec argument. The array is modified so that it consists of the unfilled 842 * portion of the original array. 843 * 844 * The returned value is the total number of bytes received, or an error. 845 */ 846 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 847 struct kvec *vec, size_t num, size_t size, int flags) 848 { 849 mm_segment_t oldfs = get_fs(); 850 int result; 851 852 set_fs(KERNEL_DS); 853 /* 854 * the following is safe, since for compiler definitions of kvec and 855 * iovec are identical, yielding the same in-core layout and alignment 856 */ 857 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; 858 result = sock_recvmsg(sock, msg, size, flags); 859 set_fs(oldfs); 860 return result; 861 } 862 EXPORT_SYMBOL(kernel_recvmsg); 863 864 static void sock_aio_dtor(struct kiocb *iocb) 865 { 866 kfree(iocb->private); 867 } 868 869 static ssize_t sock_sendpage(struct file *file, struct page *page, 870 int offset, size_t size, loff_t *ppos, int more) 871 { 872 struct socket *sock; 873 int flags; 874 875 sock = file->private_data; 876 877 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 878 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 879 flags |= more; 880 881 return kernel_sendpage(sock, page, offset, size, flags); 882 } 883 884 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 885 struct pipe_inode_info *pipe, size_t len, 886 unsigned int flags) 887 { 888 struct socket *sock = file->private_data; 889 890 if (unlikely(!sock->ops->splice_read)) 891 return -EINVAL; 892 893 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 894 } 895 896 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 897 struct sock_iocb *siocb) 898 { 899 if (!is_sync_kiocb(iocb)) { 900 siocb = kmalloc(sizeof(*siocb), GFP_KERNEL); 901 if (!siocb) 902 return NULL; 903 iocb->ki_dtor = sock_aio_dtor; 904 } 905 906 siocb->kiocb = iocb; 907 iocb->private = siocb; 908 return siocb; 909 } 910 911 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 912 struct file *file, const struct iovec *iov, 913 unsigned long nr_segs) 914 { 915 struct socket *sock = file->private_data; 916 size_t size = 0; 917 int i; 918 919 for (i = 0; i < nr_segs; i++) 920 size += iov[i].iov_len; 921 922 msg->msg_name = NULL; 923 msg->msg_namelen = 0; 924 msg->msg_control = NULL; 925 msg->msg_controllen = 0; 926 msg->msg_iov = (struct iovec *)iov; 927 msg->msg_iovlen = nr_segs; 928 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 929 930 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 931 } 932 933 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 934 unsigned long nr_segs, loff_t pos) 935 { 936 struct sock_iocb siocb, *x; 937 938 if (pos != 0) 939 return -ESPIPE; 940 941 if (iocb->ki_left == 0) /* Match SYS5 behaviour */ 942 return 0; 943 944 945 x = alloc_sock_iocb(iocb, &siocb); 946 if (!x) 947 return -ENOMEM; 948 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 949 } 950 951 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 952 struct file *file, const struct iovec *iov, 953 unsigned long nr_segs) 954 { 955 struct socket *sock = file->private_data; 956 size_t size = 0; 957 int i; 958 959 for (i = 0; i < nr_segs; i++) 960 size += iov[i].iov_len; 961 962 msg->msg_name = NULL; 963 msg->msg_namelen = 0; 964 msg->msg_control = NULL; 965 msg->msg_controllen = 0; 966 msg->msg_iov = (struct iovec *)iov; 967 msg->msg_iovlen = nr_segs; 968 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 969 if (sock->type == SOCK_SEQPACKET) 970 msg->msg_flags |= MSG_EOR; 971 972 return __sock_sendmsg(iocb, sock, msg, size); 973 } 974 975 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 976 unsigned long nr_segs, loff_t pos) 977 { 978 struct sock_iocb siocb, *x; 979 980 if (pos != 0) 981 return -ESPIPE; 982 983 x = alloc_sock_iocb(iocb, &siocb); 984 if (!x) 985 return -ENOMEM; 986 987 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 988 } 989 990 /* 991 * Atomic setting of ioctl hooks to avoid race 992 * with module unload. 993 */ 994 995 static DEFINE_MUTEX(br_ioctl_mutex); 996 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 997 998 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 999 { 1000 mutex_lock(&br_ioctl_mutex); 1001 br_ioctl_hook = hook; 1002 mutex_unlock(&br_ioctl_mutex); 1003 } 1004 EXPORT_SYMBOL(brioctl_set); 1005 1006 static DEFINE_MUTEX(vlan_ioctl_mutex); 1007 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 1008 1009 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 1010 { 1011 mutex_lock(&vlan_ioctl_mutex); 1012 vlan_ioctl_hook = hook; 1013 mutex_unlock(&vlan_ioctl_mutex); 1014 } 1015 EXPORT_SYMBOL(vlan_ioctl_set); 1016 1017 static DEFINE_MUTEX(dlci_ioctl_mutex); 1018 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 1019 1020 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 1021 { 1022 mutex_lock(&dlci_ioctl_mutex); 1023 dlci_ioctl_hook = hook; 1024 mutex_unlock(&dlci_ioctl_mutex); 1025 } 1026 EXPORT_SYMBOL(dlci_ioctl_set); 1027 1028 static long sock_do_ioctl(struct net *net, struct socket *sock, 1029 unsigned int cmd, unsigned long arg) 1030 { 1031 int err; 1032 void __user *argp = (void __user *)arg; 1033 1034 err = sock->ops->ioctl(sock, cmd, arg); 1035 1036 /* 1037 * If this ioctl is unknown try to hand it down 1038 * to the NIC driver. 1039 */ 1040 if (err == -ENOIOCTLCMD) 1041 err = dev_ioctl(net, cmd, argp); 1042 1043 return err; 1044 } 1045 1046 /* 1047 * With an ioctl, arg may well be a user mode pointer, but we don't know 1048 * what to do with it - that's up to the protocol still. 1049 */ 1050 1051 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 1052 { 1053 struct socket *sock; 1054 struct sock *sk; 1055 void __user *argp = (void __user *)arg; 1056 int pid, err; 1057 struct net *net; 1058 1059 sock = file->private_data; 1060 sk = sock->sk; 1061 net = sock_net(sk); 1062 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 1063 err = dev_ioctl(net, cmd, argp); 1064 } else 1065 #ifdef CONFIG_WEXT_CORE 1066 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1067 err = dev_ioctl(net, cmd, argp); 1068 } else 1069 #endif 1070 switch (cmd) { 1071 case FIOSETOWN: 1072 case SIOCSPGRP: 1073 err = -EFAULT; 1074 if (get_user(pid, (int __user *)argp)) 1075 break; 1076 err = f_setown(sock->file, pid, 1); 1077 break; 1078 case FIOGETOWN: 1079 case SIOCGPGRP: 1080 err = put_user(f_getown(sock->file), 1081 (int __user *)argp); 1082 break; 1083 case SIOCGIFBR: 1084 case SIOCSIFBR: 1085 case SIOCBRADDBR: 1086 case SIOCBRDELBR: 1087 err = -ENOPKG; 1088 if (!br_ioctl_hook) 1089 request_module("bridge"); 1090 1091 mutex_lock(&br_ioctl_mutex); 1092 if (br_ioctl_hook) 1093 err = br_ioctl_hook(net, cmd, argp); 1094 mutex_unlock(&br_ioctl_mutex); 1095 break; 1096 case SIOCGIFVLAN: 1097 case SIOCSIFVLAN: 1098 err = -ENOPKG; 1099 if (!vlan_ioctl_hook) 1100 request_module("8021q"); 1101 1102 mutex_lock(&vlan_ioctl_mutex); 1103 if (vlan_ioctl_hook) 1104 err = vlan_ioctl_hook(net, argp); 1105 mutex_unlock(&vlan_ioctl_mutex); 1106 break; 1107 case SIOCADDDLCI: 1108 case SIOCDELDLCI: 1109 err = -ENOPKG; 1110 if (!dlci_ioctl_hook) 1111 request_module("dlci"); 1112 1113 mutex_lock(&dlci_ioctl_mutex); 1114 if (dlci_ioctl_hook) 1115 err = dlci_ioctl_hook(cmd, argp); 1116 mutex_unlock(&dlci_ioctl_mutex); 1117 break; 1118 default: 1119 err = sock_do_ioctl(net, sock, cmd, arg); 1120 break; 1121 } 1122 return err; 1123 } 1124 1125 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1126 { 1127 int err; 1128 struct socket *sock = NULL; 1129 1130 err = security_socket_create(family, type, protocol, 1); 1131 if (err) 1132 goto out; 1133 1134 sock = sock_alloc(); 1135 if (!sock) { 1136 err = -ENOMEM; 1137 goto out; 1138 } 1139 1140 sock->type = type; 1141 err = security_socket_post_create(sock, family, type, protocol, 1); 1142 if (err) 1143 goto out_release; 1144 1145 out: 1146 *res = sock; 1147 return err; 1148 out_release: 1149 sock_release(sock); 1150 sock = NULL; 1151 goto out; 1152 } 1153 EXPORT_SYMBOL(sock_create_lite); 1154 1155 /* No kernel lock held - perfect */ 1156 static unsigned int sock_poll(struct file *file, poll_table *wait) 1157 { 1158 struct socket *sock; 1159 1160 /* 1161 * We can't return errors to poll, so it's either yes or no. 1162 */ 1163 sock = file->private_data; 1164 return sock->ops->poll(file, sock, wait); 1165 } 1166 1167 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1168 { 1169 struct socket *sock = file->private_data; 1170 1171 return sock->ops->mmap(file, sock, vma); 1172 } 1173 1174 static int sock_close(struct inode *inode, struct file *filp) 1175 { 1176 /* 1177 * It was possible the inode is NULL we were 1178 * closing an unfinished socket. 1179 */ 1180 1181 if (!inode) { 1182 printk(KERN_DEBUG "sock_close: NULL inode\n"); 1183 return 0; 1184 } 1185 sock_release(SOCKET_I(inode)); 1186 return 0; 1187 } 1188 1189 /* 1190 * Update the socket async list 1191 * 1192 * Fasync_list locking strategy. 1193 * 1194 * 1. fasync_list is modified only under process context socket lock 1195 * i.e. under semaphore. 1196 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1197 * or under socket lock 1198 */ 1199 1200 static int sock_fasync(int fd, struct file *filp, int on) 1201 { 1202 struct socket *sock = filp->private_data; 1203 struct sock *sk = sock->sk; 1204 struct socket_wq *wq; 1205 1206 if (sk == NULL) 1207 return -EINVAL; 1208 1209 lock_sock(sk); 1210 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); 1211 fasync_helper(fd, filp, on, &wq->fasync_list); 1212 1213 if (!wq->fasync_list) 1214 sock_reset_flag(sk, SOCK_FASYNC); 1215 else 1216 sock_set_flag(sk, SOCK_FASYNC); 1217 1218 release_sock(sk); 1219 return 0; 1220 } 1221 1222 /* This function may be called only under socket lock or callback_lock or rcu_lock */ 1223 1224 int sock_wake_async(struct socket *sock, int how, int band) 1225 { 1226 struct socket_wq *wq; 1227 1228 if (!sock) 1229 return -1; 1230 rcu_read_lock(); 1231 wq = rcu_dereference(sock->wq); 1232 if (!wq || !wq->fasync_list) { 1233 rcu_read_unlock(); 1234 return -1; 1235 } 1236 switch (how) { 1237 case SOCK_WAKE_WAITD: 1238 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 1239 break; 1240 goto call_kill; 1241 case SOCK_WAKE_SPACE: 1242 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 1243 break; 1244 /* fall through */ 1245 case SOCK_WAKE_IO: 1246 call_kill: 1247 kill_fasync(&wq->fasync_list, SIGIO, band); 1248 break; 1249 case SOCK_WAKE_URG: 1250 kill_fasync(&wq->fasync_list, SIGURG, band); 1251 } 1252 rcu_read_unlock(); 1253 return 0; 1254 } 1255 EXPORT_SYMBOL(sock_wake_async); 1256 1257 int __sock_create(struct net *net, int family, int type, int protocol, 1258 struct socket **res, int kern) 1259 { 1260 int err; 1261 struct socket *sock; 1262 const struct net_proto_family *pf; 1263 1264 /* 1265 * Check protocol is in range 1266 */ 1267 if (family < 0 || family >= NPROTO) 1268 return -EAFNOSUPPORT; 1269 if (type < 0 || type >= SOCK_MAX) 1270 return -EINVAL; 1271 1272 /* Compatibility. 1273 1274 This uglymoron is moved from INET layer to here to avoid 1275 deadlock in module load. 1276 */ 1277 if (family == PF_INET && type == SOCK_PACKET) { 1278 static int warned; 1279 if (!warned) { 1280 warned = 1; 1281 printk(KERN_INFO "%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1282 current->comm); 1283 } 1284 family = PF_PACKET; 1285 } 1286 1287 err = security_socket_create(family, type, protocol, kern); 1288 if (err) 1289 return err; 1290 1291 /* 1292 * Allocate the socket and allow the family to set things up. if 1293 * the protocol is 0, the family is instructed to select an appropriate 1294 * default. 1295 */ 1296 sock = sock_alloc(); 1297 if (!sock) { 1298 net_warn_ratelimited("socket: no more sockets\n"); 1299 return -ENFILE; /* Not exactly a match, but its the 1300 closest posix thing */ 1301 } 1302 1303 sock->type = type; 1304 1305 #ifdef CONFIG_MODULES 1306 /* Attempt to load a protocol module if the find failed. 1307 * 1308 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1309 * requested real, full-featured networking support upon configuration. 1310 * Otherwise module support will break! 1311 */ 1312 if (rcu_access_pointer(net_families[family]) == NULL) 1313 request_module("net-pf-%d", family); 1314 #endif 1315 1316 rcu_read_lock(); 1317 pf = rcu_dereference(net_families[family]); 1318 err = -EAFNOSUPPORT; 1319 if (!pf) 1320 goto out_release; 1321 1322 /* 1323 * We will call the ->create function, that possibly is in a loadable 1324 * module, so we have to bump that loadable module refcnt first. 1325 */ 1326 if (!try_module_get(pf->owner)) 1327 goto out_release; 1328 1329 /* Now protected by module ref count */ 1330 rcu_read_unlock(); 1331 1332 err = pf->create(net, sock, protocol, kern); 1333 if (err < 0) 1334 goto out_module_put; 1335 1336 /* 1337 * Now to bump the refcnt of the [loadable] module that owns this 1338 * socket at sock_release time we decrement its refcnt. 1339 */ 1340 if (!try_module_get(sock->ops->owner)) 1341 goto out_module_busy; 1342 1343 /* 1344 * Now that we're done with the ->create function, the [loadable] 1345 * module can have its refcnt decremented 1346 */ 1347 module_put(pf->owner); 1348 err = security_socket_post_create(sock, family, type, protocol, kern); 1349 if (err) 1350 goto out_sock_release; 1351 *res = sock; 1352 1353 return 0; 1354 1355 out_module_busy: 1356 err = -EAFNOSUPPORT; 1357 out_module_put: 1358 sock->ops = NULL; 1359 module_put(pf->owner); 1360 out_sock_release: 1361 sock_release(sock); 1362 return err; 1363 1364 out_release: 1365 rcu_read_unlock(); 1366 goto out_sock_release; 1367 } 1368 EXPORT_SYMBOL(__sock_create); 1369 1370 int sock_create(int family, int type, int protocol, struct socket **res) 1371 { 1372 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1373 } 1374 EXPORT_SYMBOL(sock_create); 1375 1376 int sock_create_kern(int family, int type, int protocol, struct socket **res) 1377 { 1378 return __sock_create(&init_net, family, type, protocol, res, 1); 1379 } 1380 EXPORT_SYMBOL(sock_create_kern); 1381 1382 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1383 { 1384 int retval; 1385 struct socket *sock; 1386 int flags; 1387 1388 /* Check the SOCK_* constants for consistency. */ 1389 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1390 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1391 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1392 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1393 1394 flags = type & ~SOCK_TYPE_MASK; 1395 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1396 return -EINVAL; 1397 type &= SOCK_TYPE_MASK; 1398 1399 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1400 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1401 1402 retval = sock_create(family, type, protocol, &sock); 1403 if (retval < 0) 1404 goto out; 1405 1406 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1407 if (retval < 0) 1408 goto out_release; 1409 1410 out: 1411 /* It may be already another descriptor 8) Not kernel problem. */ 1412 return retval; 1413 1414 out_release: 1415 sock_release(sock); 1416 return retval; 1417 } 1418 1419 /* 1420 * Create a pair of connected sockets. 1421 */ 1422 1423 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1424 int __user *, usockvec) 1425 { 1426 struct socket *sock1, *sock2; 1427 int fd1, fd2, err; 1428 struct file *newfile1, *newfile2; 1429 int flags; 1430 1431 flags = type & ~SOCK_TYPE_MASK; 1432 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1433 return -EINVAL; 1434 type &= SOCK_TYPE_MASK; 1435 1436 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1437 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1438 1439 /* 1440 * Obtain the first socket and check if the underlying protocol 1441 * supports the socketpair call. 1442 */ 1443 1444 err = sock_create(family, type, protocol, &sock1); 1445 if (err < 0) 1446 goto out; 1447 1448 err = sock_create(family, type, protocol, &sock2); 1449 if (err < 0) 1450 goto out_release_1; 1451 1452 err = sock1->ops->socketpair(sock1, sock2); 1453 if (err < 0) 1454 goto out_release_both; 1455 1456 fd1 = get_unused_fd_flags(flags); 1457 if (unlikely(fd1 < 0)) { 1458 err = fd1; 1459 goto out_release_both; 1460 } 1461 fd2 = get_unused_fd_flags(flags); 1462 if (unlikely(fd2 < 0)) { 1463 err = fd2; 1464 put_unused_fd(fd1); 1465 goto out_release_both; 1466 } 1467 1468 newfile1 = sock_alloc_file(sock1, flags, NULL); 1469 if (unlikely(IS_ERR(newfile1))) { 1470 err = PTR_ERR(newfile1); 1471 put_unused_fd(fd1); 1472 put_unused_fd(fd2); 1473 goto out_release_both; 1474 } 1475 1476 newfile2 = sock_alloc_file(sock2, flags, NULL); 1477 if (IS_ERR(newfile2)) { 1478 err = PTR_ERR(newfile2); 1479 fput(newfile1); 1480 put_unused_fd(fd1); 1481 put_unused_fd(fd2); 1482 sock_release(sock2); 1483 goto out; 1484 } 1485 1486 audit_fd_pair(fd1, fd2); 1487 fd_install(fd1, newfile1); 1488 fd_install(fd2, newfile2); 1489 /* fd1 and fd2 may be already another descriptors. 1490 * Not kernel problem. 1491 */ 1492 1493 err = put_user(fd1, &usockvec[0]); 1494 if (!err) 1495 err = put_user(fd2, &usockvec[1]); 1496 if (!err) 1497 return 0; 1498 1499 sys_close(fd2); 1500 sys_close(fd1); 1501 return err; 1502 1503 out_release_both: 1504 sock_release(sock2); 1505 out_release_1: 1506 sock_release(sock1); 1507 out: 1508 return err; 1509 } 1510 1511 /* 1512 * Bind a name to a socket. Nothing much to do here since it's 1513 * the protocol's responsibility to handle the local address. 1514 * 1515 * We move the socket address to kernel space before we call 1516 * the protocol layer (having also checked the address is ok). 1517 */ 1518 1519 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1520 { 1521 struct socket *sock; 1522 struct sockaddr_storage address; 1523 int err, fput_needed; 1524 1525 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1526 if (sock) { 1527 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1528 if (err >= 0) { 1529 err = security_socket_bind(sock, 1530 (struct sockaddr *)&address, 1531 addrlen); 1532 if (!err) 1533 err = sock->ops->bind(sock, 1534 (struct sockaddr *) 1535 &address, addrlen); 1536 } 1537 fput_light(sock->file, fput_needed); 1538 } 1539 return err; 1540 } 1541 1542 /* 1543 * Perform a listen. Basically, we allow the protocol to do anything 1544 * necessary for a listen, and if that works, we mark the socket as 1545 * ready for listening. 1546 */ 1547 1548 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1549 { 1550 struct socket *sock; 1551 int err, fput_needed; 1552 int somaxconn; 1553 1554 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1555 if (sock) { 1556 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1557 if ((unsigned int)backlog > somaxconn) 1558 backlog = somaxconn; 1559 1560 err = security_socket_listen(sock, backlog); 1561 if (!err) 1562 err = sock->ops->listen(sock, backlog); 1563 1564 fput_light(sock->file, fput_needed); 1565 } 1566 return err; 1567 } 1568 1569 /* 1570 * For accept, we attempt to create a new socket, set up the link 1571 * with the client, wake up the client, then return the new 1572 * connected fd. We collect the address of the connector in kernel 1573 * space and move it to user at the very end. This is unclean because 1574 * we open the socket then return an error. 1575 * 1576 * 1003.1g adds the ability to recvmsg() to query connection pending 1577 * status to recvmsg. We need to add that support in a way thats 1578 * clean when we restucture accept also. 1579 */ 1580 1581 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1582 int __user *, upeer_addrlen, int, flags) 1583 { 1584 struct socket *sock, *newsock; 1585 struct file *newfile; 1586 int err, len, newfd, fput_needed; 1587 struct sockaddr_storage address; 1588 1589 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1590 return -EINVAL; 1591 1592 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1593 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1594 1595 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1596 if (!sock) 1597 goto out; 1598 1599 err = -ENFILE; 1600 newsock = sock_alloc(); 1601 if (!newsock) 1602 goto out_put; 1603 1604 newsock->type = sock->type; 1605 newsock->ops = sock->ops; 1606 1607 /* 1608 * We don't need try_module_get here, as the listening socket (sock) 1609 * has the protocol module (sock->ops->owner) held. 1610 */ 1611 __module_get(newsock->ops->owner); 1612 1613 newfd = get_unused_fd_flags(flags); 1614 if (unlikely(newfd < 0)) { 1615 err = newfd; 1616 sock_release(newsock); 1617 goto out_put; 1618 } 1619 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1620 if (unlikely(IS_ERR(newfile))) { 1621 err = PTR_ERR(newfile); 1622 put_unused_fd(newfd); 1623 sock_release(newsock); 1624 goto out_put; 1625 } 1626 1627 err = security_socket_accept(sock, newsock); 1628 if (err) 1629 goto out_fd; 1630 1631 err = sock->ops->accept(sock, newsock, sock->file->f_flags); 1632 if (err < 0) 1633 goto out_fd; 1634 1635 if (upeer_sockaddr) { 1636 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1637 &len, 2) < 0) { 1638 err = -ECONNABORTED; 1639 goto out_fd; 1640 } 1641 err = move_addr_to_user(&address, 1642 len, upeer_sockaddr, upeer_addrlen); 1643 if (err < 0) 1644 goto out_fd; 1645 } 1646 1647 /* File flags are not inherited via accept() unlike another OSes. */ 1648 1649 fd_install(newfd, newfile); 1650 err = newfd; 1651 1652 out_put: 1653 fput_light(sock->file, fput_needed); 1654 out: 1655 return err; 1656 out_fd: 1657 fput(newfile); 1658 put_unused_fd(newfd); 1659 goto out_put; 1660 } 1661 1662 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1663 int __user *, upeer_addrlen) 1664 { 1665 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1666 } 1667 1668 /* 1669 * Attempt to connect to a socket with the server address. The address 1670 * is in user space so we verify it is OK and move it to kernel space. 1671 * 1672 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1673 * break bindings 1674 * 1675 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1676 * other SEQPACKET protocols that take time to connect() as it doesn't 1677 * include the -EINPROGRESS status for such sockets. 1678 */ 1679 1680 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1681 int, addrlen) 1682 { 1683 struct socket *sock; 1684 struct sockaddr_storage address; 1685 int err, fput_needed; 1686 1687 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1688 if (!sock) 1689 goto out; 1690 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1691 if (err < 0) 1692 goto out_put; 1693 1694 err = 1695 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1696 if (err) 1697 goto out_put; 1698 1699 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1700 sock->file->f_flags); 1701 out_put: 1702 fput_light(sock->file, fput_needed); 1703 out: 1704 return err; 1705 } 1706 1707 /* 1708 * Get the local address ('name') of a socket object. Move the obtained 1709 * name to user space. 1710 */ 1711 1712 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1713 int __user *, usockaddr_len) 1714 { 1715 struct socket *sock; 1716 struct sockaddr_storage address; 1717 int len, err, fput_needed; 1718 1719 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1720 if (!sock) 1721 goto out; 1722 1723 err = security_socket_getsockname(sock); 1724 if (err) 1725 goto out_put; 1726 1727 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1728 if (err) 1729 goto out_put; 1730 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 1731 1732 out_put: 1733 fput_light(sock->file, fput_needed); 1734 out: 1735 return err; 1736 } 1737 1738 /* 1739 * Get the remote address ('name') of a socket object. Move the obtained 1740 * name to user space. 1741 */ 1742 1743 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1744 int __user *, usockaddr_len) 1745 { 1746 struct socket *sock; 1747 struct sockaddr_storage address; 1748 int len, err, fput_needed; 1749 1750 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1751 if (sock != NULL) { 1752 err = security_socket_getpeername(sock); 1753 if (err) { 1754 fput_light(sock->file, fput_needed); 1755 return err; 1756 } 1757 1758 err = 1759 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1760 1); 1761 if (!err) 1762 err = move_addr_to_user(&address, len, usockaddr, 1763 usockaddr_len); 1764 fput_light(sock->file, fput_needed); 1765 } 1766 return err; 1767 } 1768 1769 /* 1770 * Send a datagram to a given address. We move the address into kernel 1771 * space and check the user space data area is readable before invoking 1772 * the protocol. 1773 */ 1774 1775 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1776 unsigned int, flags, struct sockaddr __user *, addr, 1777 int, addr_len) 1778 { 1779 struct socket *sock; 1780 struct sockaddr_storage address; 1781 int err; 1782 struct msghdr msg; 1783 struct iovec iov; 1784 int fput_needed; 1785 1786 if (len > INT_MAX) 1787 len = INT_MAX; 1788 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1789 if (!sock) 1790 goto out; 1791 1792 iov.iov_base = buff; 1793 iov.iov_len = len; 1794 msg.msg_name = NULL; 1795 msg.msg_iov = &iov; 1796 msg.msg_iovlen = 1; 1797 msg.msg_control = NULL; 1798 msg.msg_controllen = 0; 1799 msg.msg_namelen = 0; 1800 if (addr) { 1801 err = move_addr_to_kernel(addr, addr_len, &address); 1802 if (err < 0) 1803 goto out_put; 1804 msg.msg_name = (struct sockaddr *)&address; 1805 msg.msg_namelen = addr_len; 1806 } 1807 if (sock->file->f_flags & O_NONBLOCK) 1808 flags |= MSG_DONTWAIT; 1809 msg.msg_flags = flags; 1810 err = sock_sendmsg(sock, &msg, len); 1811 1812 out_put: 1813 fput_light(sock->file, fput_needed); 1814 out: 1815 return err; 1816 } 1817 1818 /* 1819 * Send a datagram down a socket. 1820 */ 1821 1822 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1823 unsigned int, flags) 1824 { 1825 return sys_sendto(fd, buff, len, flags, NULL, 0); 1826 } 1827 1828 /* 1829 * Receive a frame from the socket and optionally record the address of the 1830 * sender. We verify the buffers are writable and if needed move the 1831 * sender address from kernel to user space. 1832 */ 1833 1834 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1835 unsigned int, flags, struct sockaddr __user *, addr, 1836 int __user *, addr_len) 1837 { 1838 struct socket *sock; 1839 struct iovec iov; 1840 struct msghdr msg; 1841 struct sockaddr_storage address; 1842 int err, err2; 1843 int fput_needed; 1844 1845 if (size > INT_MAX) 1846 size = INT_MAX; 1847 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1848 if (!sock) 1849 goto out; 1850 1851 msg.msg_control = NULL; 1852 msg.msg_controllen = 0; 1853 msg.msg_iovlen = 1; 1854 msg.msg_iov = &iov; 1855 iov.iov_len = size; 1856 iov.iov_base = ubuf; 1857 msg.msg_name = (struct sockaddr *)&address; 1858 msg.msg_namelen = sizeof(address); 1859 if (sock->file->f_flags & O_NONBLOCK) 1860 flags |= MSG_DONTWAIT; 1861 err = sock_recvmsg(sock, &msg, size, flags); 1862 1863 if (err >= 0 && addr != NULL) { 1864 err2 = move_addr_to_user(&address, 1865 msg.msg_namelen, addr, addr_len); 1866 if (err2 < 0) 1867 err = err2; 1868 } 1869 1870 fput_light(sock->file, fput_needed); 1871 out: 1872 return err; 1873 } 1874 1875 /* 1876 * Receive a datagram from a socket. 1877 */ 1878 1879 asmlinkage long sys_recv(int fd, void __user *ubuf, size_t size, 1880 unsigned int flags) 1881 { 1882 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1883 } 1884 1885 /* 1886 * Set a socket option. Because we don't know the option lengths we have 1887 * to pass the user mode parameter for the protocols to sort out. 1888 */ 1889 1890 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1891 char __user *, optval, int, optlen) 1892 { 1893 int err, fput_needed; 1894 struct socket *sock; 1895 1896 if (optlen < 0) 1897 return -EINVAL; 1898 1899 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1900 if (sock != NULL) { 1901 err = security_socket_setsockopt(sock, level, optname); 1902 if (err) 1903 goto out_put; 1904 1905 if (level == SOL_SOCKET) 1906 err = 1907 sock_setsockopt(sock, level, optname, optval, 1908 optlen); 1909 else 1910 err = 1911 sock->ops->setsockopt(sock, level, optname, optval, 1912 optlen); 1913 out_put: 1914 fput_light(sock->file, fput_needed); 1915 } 1916 return err; 1917 } 1918 1919 /* 1920 * Get a socket option. Because we don't know the option lengths we have 1921 * to pass a user mode parameter for the protocols to sort out. 1922 */ 1923 1924 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1925 char __user *, optval, int __user *, optlen) 1926 { 1927 int err, fput_needed; 1928 struct socket *sock; 1929 1930 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1931 if (sock != NULL) { 1932 err = security_socket_getsockopt(sock, level, optname); 1933 if (err) 1934 goto out_put; 1935 1936 if (level == SOL_SOCKET) 1937 err = 1938 sock_getsockopt(sock, level, optname, optval, 1939 optlen); 1940 else 1941 err = 1942 sock->ops->getsockopt(sock, level, optname, optval, 1943 optlen); 1944 out_put: 1945 fput_light(sock->file, fput_needed); 1946 } 1947 return err; 1948 } 1949 1950 /* 1951 * Shutdown a socket. 1952 */ 1953 1954 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1955 { 1956 int err, fput_needed; 1957 struct socket *sock; 1958 1959 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1960 if (sock != NULL) { 1961 err = security_socket_shutdown(sock, how); 1962 if (!err) 1963 err = sock->ops->shutdown(sock, how); 1964 fput_light(sock->file, fput_needed); 1965 } 1966 return err; 1967 } 1968 1969 /* A couple of helpful macros for getting the address of the 32/64 bit 1970 * fields which are the same type (int / unsigned) on our platforms. 1971 */ 1972 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1973 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1974 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1975 1976 struct used_address { 1977 struct sockaddr_storage name; 1978 unsigned int name_len; 1979 }; 1980 1981 static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg, 1982 struct msghdr *msg_sys, unsigned int flags, 1983 struct used_address *used_address) 1984 { 1985 struct compat_msghdr __user *msg_compat = 1986 (struct compat_msghdr __user *)msg; 1987 struct sockaddr_storage address; 1988 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1989 unsigned char ctl[sizeof(struct cmsghdr) + 20] 1990 __attribute__ ((aligned(sizeof(__kernel_size_t)))); 1991 /* 20 is size of ipv6_pktinfo */ 1992 unsigned char *ctl_buf = ctl; 1993 int err, ctl_len, total_len; 1994 1995 err = -EFAULT; 1996 if (MSG_CMSG_COMPAT & flags) { 1997 if (get_compat_msghdr(msg_sys, msg_compat)) 1998 return -EFAULT; 1999 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) 2000 return -EFAULT; 2001 2002 if (msg_sys->msg_iovlen > UIO_FASTIOV) { 2003 err = -EMSGSIZE; 2004 if (msg_sys->msg_iovlen > UIO_MAXIOV) 2005 goto out; 2006 err = -ENOMEM; 2007 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), 2008 GFP_KERNEL); 2009 if (!iov) 2010 goto out; 2011 } 2012 2013 /* This will also move the address data into kernel space */ 2014 if (MSG_CMSG_COMPAT & flags) { 2015 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ); 2016 } else 2017 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ); 2018 if (err < 0) 2019 goto out_freeiov; 2020 total_len = err; 2021 2022 err = -ENOBUFS; 2023 2024 if (msg_sys->msg_controllen > INT_MAX) 2025 goto out_freeiov; 2026 ctl_len = msg_sys->msg_controllen; 2027 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2028 err = 2029 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2030 sizeof(ctl)); 2031 if (err) 2032 goto out_freeiov; 2033 ctl_buf = msg_sys->msg_control; 2034 ctl_len = msg_sys->msg_controllen; 2035 } else if (ctl_len) { 2036 if (ctl_len > sizeof(ctl)) { 2037 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2038 if (ctl_buf == NULL) 2039 goto out_freeiov; 2040 } 2041 err = -EFAULT; 2042 /* 2043 * Careful! Before this, msg_sys->msg_control contains a user pointer. 2044 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 2045 * checking falls down on this. 2046 */ 2047 if (copy_from_user(ctl_buf, 2048 (void __user __force *)msg_sys->msg_control, 2049 ctl_len)) 2050 goto out_freectl; 2051 msg_sys->msg_control = ctl_buf; 2052 } 2053 msg_sys->msg_flags = flags; 2054 2055 if (sock->file->f_flags & O_NONBLOCK) 2056 msg_sys->msg_flags |= MSG_DONTWAIT; 2057 /* 2058 * If this is sendmmsg() and current destination address is same as 2059 * previously succeeded address, omit asking LSM's decision. 2060 * used_address->name_len is initialized to UINT_MAX so that the first 2061 * destination address never matches. 2062 */ 2063 if (used_address && msg_sys->msg_name && 2064 used_address->name_len == msg_sys->msg_namelen && 2065 !memcmp(&used_address->name, msg_sys->msg_name, 2066 used_address->name_len)) { 2067 err = sock_sendmsg_nosec(sock, msg_sys, total_len); 2068 goto out_freectl; 2069 } 2070 err = sock_sendmsg(sock, msg_sys, total_len); 2071 /* 2072 * If this is sendmmsg() and sending to current destination address was 2073 * successful, remember it. 2074 */ 2075 if (used_address && err >= 0) { 2076 used_address->name_len = msg_sys->msg_namelen; 2077 if (msg_sys->msg_name) 2078 memcpy(&used_address->name, msg_sys->msg_name, 2079 used_address->name_len); 2080 } 2081 2082 out_freectl: 2083 if (ctl_buf != ctl) 2084 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2085 out_freeiov: 2086 if (iov != iovstack) 2087 kfree(iov); 2088 out: 2089 return err; 2090 } 2091 2092 /* 2093 * BSD sendmsg interface 2094 */ 2095 2096 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags) 2097 { 2098 int fput_needed, err; 2099 struct msghdr msg_sys; 2100 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); 2101 2102 if (!sock) 2103 goto out; 2104 2105 err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL); 2106 2107 fput_light(sock->file, fput_needed); 2108 out: 2109 return err; 2110 } 2111 2112 /* 2113 * Linux sendmmsg interface 2114 */ 2115 2116 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2117 unsigned int flags) 2118 { 2119 int fput_needed, err, datagrams; 2120 struct socket *sock; 2121 struct mmsghdr __user *entry; 2122 struct compat_mmsghdr __user *compat_entry; 2123 struct msghdr msg_sys; 2124 struct used_address used_address; 2125 2126 if (vlen > UIO_MAXIOV) 2127 vlen = UIO_MAXIOV; 2128 2129 datagrams = 0; 2130 2131 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2132 if (!sock) 2133 return err; 2134 2135 used_address.name_len = UINT_MAX; 2136 entry = mmsg; 2137 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2138 err = 0; 2139 2140 while (datagrams < vlen) { 2141 if (MSG_CMSG_COMPAT & flags) { 2142 err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry, 2143 &msg_sys, flags, &used_address); 2144 if (err < 0) 2145 break; 2146 err = __put_user(err, &compat_entry->msg_len); 2147 ++compat_entry; 2148 } else { 2149 err = __sys_sendmsg(sock, (struct msghdr __user *)entry, 2150 &msg_sys, flags, &used_address); 2151 if (err < 0) 2152 break; 2153 err = put_user(err, &entry->msg_len); 2154 ++entry; 2155 } 2156 2157 if (err) 2158 break; 2159 ++datagrams; 2160 } 2161 2162 fput_light(sock->file, fput_needed); 2163 2164 /* We only return an error if no datagrams were able to be sent */ 2165 if (datagrams != 0) 2166 return datagrams; 2167 2168 return err; 2169 } 2170 2171 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2172 unsigned int, vlen, unsigned int, flags) 2173 { 2174 return __sys_sendmmsg(fd, mmsg, vlen, flags); 2175 } 2176 2177 static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg, 2178 struct msghdr *msg_sys, unsigned int flags, int nosec) 2179 { 2180 struct compat_msghdr __user *msg_compat = 2181 (struct compat_msghdr __user *)msg; 2182 struct iovec iovstack[UIO_FASTIOV]; 2183 struct iovec *iov = iovstack; 2184 unsigned long cmsg_ptr; 2185 int err, total_len, len; 2186 2187 /* kernel mode address */ 2188 struct sockaddr_storage addr; 2189 2190 /* user mode address pointers */ 2191 struct sockaddr __user *uaddr; 2192 int __user *uaddr_len; 2193 2194 if (MSG_CMSG_COMPAT & flags) { 2195 if (get_compat_msghdr(msg_sys, msg_compat)) 2196 return -EFAULT; 2197 } else if (copy_from_user(msg_sys, msg, sizeof(struct msghdr))) 2198 return -EFAULT; 2199 2200 if (msg_sys->msg_iovlen > UIO_FASTIOV) { 2201 err = -EMSGSIZE; 2202 if (msg_sys->msg_iovlen > UIO_MAXIOV) 2203 goto out; 2204 err = -ENOMEM; 2205 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), 2206 GFP_KERNEL); 2207 if (!iov) 2208 goto out; 2209 } 2210 2211 /* 2212 * Save the user-mode address (verify_iovec will change the 2213 * kernel msghdr to use the kernel address space) 2214 */ 2215 2216 uaddr = (__force void __user *)msg_sys->msg_name; 2217 uaddr_len = COMPAT_NAMELEN(msg); 2218 if (MSG_CMSG_COMPAT & flags) { 2219 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE); 2220 } else 2221 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE); 2222 if (err < 0) 2223 goto out_freeiov; 2224 total_len = err; 2225 2226 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2227 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2228 2229 if (sock->file->f_flags & O_NONBLOCK) 2230 flags |= MSG_DONTWAIT; 2231 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, 2232 total_len, flags); 2233 if (err < 0) 2234 goto out_freeiov; 2235 len = err; 2236 2237 if (uaddr != NULL) { 2238 err = move_addr_to_user(&addr, 2239 msg_sys->msg_namelen, uaddr, 2240 uaddr_len); 2241 if (err < 0) 2242 goto out_freeiov; 2243 } 2244 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2245 COMPAT_FLAGS(msg)); 2246 if (err) 2247 goto out_freeiov; 2248 if (MSG_CMSG_COMPAT & flags) 2249 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2250 &msg_compat->msg_controllen); 2251 else 2252 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2253 &msg->msg_controllen); 2254 if (err) 2255 goto out_freeiov; 2256 err = len; 2257 2258 out_freeiov: 2259 if (iov != iovstack) 2260 kfree(iov); 2261 out: 2262 return err; 2263 } 2264 2265 /* 2266 * BSD recvmsg interface 2267 */ 2268 2269 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, 2270 unsigned int, flags) 2271 { 2272 int fput_needed, err; 2273 struct msghdr msg_sys; 2274 struct socket *sock = sockfd_lookup_light(fd, &err, &fput_needed); 2275 2276 if (!sock) 2277 goto out; 2278 2279 err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2280 2281 fput_light(sock->file, fput_needed); 2282 out: 2283 return err; 2284 } 2285 2286 /* 2287 * Linux recvmmsg interface 2288 */ 2289 2290 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2291 unsigned int flags, struct timespec *timeout) 2292 { 2293 int fput_needed, err, datagrams; 2294 struct socket *sock; 2295 struct mmsghdr __user *entry; 2296 struct compat_mmsghdr __user *compat_entry; 2297 struct msghdr msg_sys; 2298 struct timespec end_time; 2299 2300 if (timeout && 2301 poll_select_set_timeout(&end_time, timeout->tv_sec, 2302 timeout->tv_nsec)) 2303 return -EINVAL; 2304 2305 datagrams = 0; 2306 2307 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2308 if (!sock) 2309 return err; 2310 2311 err = sock_error(sock->sk); 2312 if (err) 2313 goto out_put; 2314 2315 entry = mmsg; 2316 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2317 2318 while (datagrams < vlen) { 2319 /* 2320 * No need to ask LSM for more than the first datagram. 2321 */ 2322 if (MSG_CMSG_COMPAT & flags) { 2323 err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry, 2324 &msg_sys, flags & ~MSG_WAITFORONE, 2325 datagrams); 2326 if (err < 0) 2327 break; 2328 err = __put_user(err, &compat_entry->msg_len); 2329 ++compat_entry; 2330 } else { 2331 err = __sys_recvmsg(sock, (struct msghdr __user *)entry, 2332 &msg_sys, flags & ~MSG_WAITFORONE, 2333 datagrams); 2334 if (err < 0) 2335 break; 2336 err = put_user(err, &entry->msg_len); 2337 ++entry; 2338 } 2339 2340 if (err) 2341 break; 2342 ++datagrams; 2343 2344 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2345 if (flags & MSG_WAITFORONE) 2346 flags |= MSG_DONTWAIT; 2347 2348 if (timeout) { 2349 ktime_get_ts(timeout); 2350 *timeout = timespec_sub(end_time, *timeout); 2351 if (timeout->tv_sec < 0) { 2352 timeout->tv_sec = timeout->tv_nsec = 0; 2353 break; 2354 } 2355 2356 /* Timeout, return less than vlen datagrams */ 2357 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2358 break; 2359 } 2360 2361 /* Out of band data, return right away */ 2362 if (msg_sys.msg_flags & MSG_OOB) 2363 break; 2364 } 2365 2366 out_put: 2367 fput_light(sock->file, fput_needed); 2368 2369 if (err == 0) 2370 return datagrams; 2371 2372 if (datagrams != 0) { 2373 /* 2374 * We may return less entries than requested (vlen) if the 2375 * sock is non block and there aren't enough datagrams... 2376 */ 2377 if (err != -EAGAIN) { 2378 /* 2379 * ... or if recvmsg returns an error after we 2380 * received some datagrams, where we record the 2381 * error to return on the next call or if the 2382 * app asks about it using getsockopt(SO_ERROR). 2383 */ 2384 sock->sk->sk_err = -err; 2385 } 2386 2387 return datagrams; 2388 } 2389 2390 return err; 2391 } 2392 2393 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2394 unsigned int, vlen, unsigned int, flags, 2395 struct timespec __user *, timeout) 2396 { 2397 int datagrams; 2398 struct timespec timeout_sys; 2399 2400 if (!timeout) 2401 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2402 2403 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2404 return -EFAULT; 2405 2406 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2407 2408 if (datagrams > 0 && 2409 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2410 datagrams = -EFAULT; 2411 2412 return datagrams; 2413 } 2414 2415 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2416 /* Argument list sizes for sys_socketcall */ 2417 #define AL(x) ((x) * sizeof(unsigned long)) 2418 static const unsigned char nargs[21] = { 2419 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2420 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2421 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2422 AL(4), AL(5), AL(4) 2423 }; 2424 2425 #undef AL 2426 2427 /* 2428 * System call vectors. 2429 * 2430 * Argument checking cleaned up. Saved 20% in size. 2431 * This function doesn't need to set the kernel lock because 2432 * it is set by the callees. 2433 */ 2434 2435 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2436 { 2437 unsigned long a[6]; 2438 unsigned long a0, a1; 2439 int err; 2440 unsigned int len; 2441 2442 if (call < 1 || call > SYS_SENDMMSG) 2443 return -EINVAL; 2444 2445 len = nargs[call]; 2446 if (len > sizeof(a)) 2447 return -EINVAL; 2448 2449 /* copy_from_user should be SMP safe. */ 2450 if (copy_from_user(a, args, len)) 2451 return -EFAULT; 2452 2453 audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2454 2455 a0 = a[0]; 2456 a1 = a[1]; 2457 2458 switch (call) { 2459 case SYS_SOCKET: 2460 err = sys_socket(a0, a1, a[2]); 2461 break; 2462 case SYS_BIND: 2463 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2464 break; 2465 case SYS_CONNECT: 2466 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2467 break; 2468 case SYS_LISTEN: 2469 err = sys_listen(a0, a1); 2470 break; 2471 case SYS_ACCEPT: 2472 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2473 (int __user *)a[2], 0); 2474 break; 2475 case SYS_GETSOCKNAME: 2476 err = 2477 sys_getsockname(a0, (struct sockaddr __user *)a1, 2478 (int __user *)a[2]); 2479 break; 2480 case SYS_GETPEERNAME: 2481 err = 2482 sys_getpeername(a0, (struct sockaddr __user *)a1, 2483 (int __user *)a[2]); 2484 break; 2485 case SYS_SOCKETPAIR: 2486 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2487 break; 2488 case SYS_SEND: 2489 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2490 break; 2491 case SYS_SENDTO: 2492 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2493 (struct sockaddr __user *)a[4], a[5]); 2494 break; 2495 case SYS_RECV: 2496 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2497 break; 2498 case SYS_RECVFROM: 2499 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2500 (struct sockaddr __user *)a[4], 2501 (int __user *)a[5]); 2502 break; 2503 case SYS_SHUTDOWN: 2504 err = sys_shutdown(a0, a1); 2505 break; 2506 case SYS_SETSOCKOPT: 2507 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2508 break; 2509 case SYS_GETSOCKOPT: 2510 err = 2511 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2512 (int __user *)a[4]); 2513 break; 2514 case SYS_SENDMSG: 2515 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); 2516 break; 2517 case SYS_SENDMMSG: 2518 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2519 break; 2520 case SYS_RECVMSG: 2521 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); 2522 break; 2523 case SYS_RECVMMSG: 2524 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2525 (struct timespec __user *)a[4]); 2526 break; 2527 case SYS_ACCEPT4: 2528 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2529 (int __user *)a[2], a[3]); 2530 break; 2531 default: 2532 err = -EINVAL; 2533 break; 2534 } 2535 return err; 2536 } 2537 2538 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2539 2540 /** 2541 * sock_register - add a socket protocol handler 2542 * @ops: description of protocol 2543 * 2544 * This function is called by a protocol handler that wants to 2545 * advertise its address family, and have it linked into the 2546 * socket interface. The value ops->family coresponds to the 2547 * socket system call protocol family. 2548 */ 2549 int sock_register(const struct net_proto_family *ops) 2550 { 2551 int err; 2552 2553 if (ops->family >= NPROTO) { 2554 printk(KERN_CRIT "protocol %d >= NPROTO(%d)\n", ops->family, 2555 NPROTO); 2556 return -ENOBUFS; 2557 } 2558 2559 spin_lock(&net_family_lock); 2560 if (rcu_dereference_protected(net_families[ops->family], 2561 lockdep_is_held(&net_family_lock))) 2562 err = -EEXIST; 2563 else { 2564 rcu_assign_pointer(net_families[ops->family], ops); 2565 err = 0; 2566 } 2567 spin_unlock(&net_family_lock); 2568 2569 printk(KERN_INFO "NET: Registered protocol family %d\n", ops->family); 2570 return err; 2571 } 2572 EXPORT_SYMBOL(sock_register); 2573 2574 /** 2575 * sock_unregister - remove a protocol handler 2576 * @family: protocol family to remove 2577 * 2578 * This function is called by a protocol handler that wants to 2579 * remove its address family, and have it unlinked from the 2580 * new socket creation. 2581 * 2582 * If protocol handler is a module, then it can use module reference 2583 * counts to protect against new references. If protocol handler is not 2584 * a module then it needs to provide its own protection in 2585 * the ops->create routine. 2586 */ 2587 void sock_unregister(int family) 2588 { 2589 BUG_ON(family < 0 || family >= NPROTO); 2590 2591 spin_lock(&net_family_lock); 2592 RCU_INIT_POINTER(net_families[family], NULL); 2593 spin_unlock(&net_family_lock); 2594 2595 synchronize_rcu(); 2596 2597 printk(KERN_INFO "NET: Unregistered protocol family %d\n", family); 2598 } 2599 EXPORT_SYMBOL(sock_unregister); 2600 2601 static int __init sock_init(void) 2602 { 2603 int err; 2604 /* 2605 * Initialize the network sysctl infrastructure. 2606 */ 2607 err = net_sysctl_init(); 2608 if (err) 2609 goto out; 2610 2611 /* 2612 * Initialize skbuff SLAB cache 2613 */ 2614 skb_init(); 2615 2616 /* 2617 * Initialize the protocols module. 2618 */ 2619 2620 init_inodecache(); 2621 2622 err = register_filesystem(&sock_fs_type); 2623 if (err) 2624 goto out_fs; 2625 sock_mnt = kern_mount(&sock_fs_type); 2626 if (IS_ERR(sock_mnt)) { 2627 err = PTR_ERR(sock_mnt); 2628 goto out_mount; 2629 } 2630 2631 /* The real protocol initialization is performed in later initcalls. 2632 */ 2633 2634 #ifdef CONFIG_NETFILTER 2635 netfilter_init(); 2636 #endif 2637 2638 #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING 2639 skb_timestamping_init(); 2640 #endif 2641 2642 out: 2643 return err; 2644 2645 out_mount: 2646 unregister_filesystem(&sock_fs_type); 2647 out_fs: 2648 goto out; 2649 } 2650 2651 core_initcall(sock_init); /* early initcall */ 2652 2653 #ifdef CONFIG_PROC_FS 2654 void socket_seq_show(struct seq_file *seq) 2655 { 2656 int cpu; 2657 int counter = 0; 2658 2659 for_each_possible_cpu(cpu) 2660 counter += per_cpu(sockets_in_use, cpu); 2661 2662 /* It can be negative, by the way. 8) */ 2663 if (counter < 0) 2664 counter = 0; 2665 2666 seq_printf(seq, "sockets: used %d\n", counter); 2667 } 2668 #endif /* CONFIG_PROC_FS */ 2669 2670 #ifdef CONFIG_COMPAT 2671 static int do_siocgstamp(struct net *net, struct socket *sock, 2672 unsigned int cmd, void __user *up) 2673 { 2674 mm_segment_t old_fs = get_fs(); 2675 struct timeval ktv; 2676 int err; 2677 2678 set_fs(KERNEL_DS); 2679 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2680 set_fs(old_fs); 2681 if (!err) 2682 err = compat_put_timeval(&ktv, up); 2683 2684 return err; 2685 } 2686 2687 static int do_siocgstampns(struct net *net, struct socket *sock, 2688 unsigned int cmd, void __user *up) 2689 { 2690 mm_segment_t old_fs = get_fs(); 2691 struct timespec kts; 2692 int err; 2693 2694 set_fs(KERNEL_DS); 2695 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2696 set_fs(old_fs); 2697 if (!err) 2698 err = compat_put_timespec(&kts, up); 2699 2700 return err; 2701 } 2702 2703 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2704 { 2705 struct ifreq __user *uifr; 2706 int err; 2707 2708 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2709 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2710 return -EFAULT; 2711 2712 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2713 if (err) 2714 return err; 2715 2716 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2717 return -EFAULT; 2718 2719 return 0; 2720 } 2721 2722 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2723 { 2724 struct compat_ifconf ifc32; 2725 struct ifconf ifc; 2726 struct ifconf __user *uifc; 2727 struct compat_ifreq __user *ifr32; 2728 struct ifreq __user *ifr; 2729 unsigned int i, j; 2730 int err; 2731 2732 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2733 return -EFAULT; 2734 2735 memset(&ifc, 0, sizeof(ifc)); 2736 if (ifc32.ifcbuf == 0) { 2737 ifc32.ifc_len = 0; 2738 ifc.ifc_len = 0; 2739 ifc.ifc_req = NULL; 2740 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2741 } else { 2742 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * 2743 sizeof(struct ifreq); 2744 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2745 ifc.ifc_len = len; 2746 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2747 ifr32 = compat_ptr(ifc32.ifcbuf); 2748 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { 2749 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2750 return -EFAULT; 2751 ifr++; 2752 ifr32++; 2753 } 2754 } 2755 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2756 return -EFAULT; 2757 2758 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2759 if (err) 2760 return err; 2761 2762 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2763 return -EFAULT; 2764 2765 ifr = ifc.ifc_req; 2766 ifr32 = compat_ptr(ifc32.ifcbuf); 2767 for (i = 0, j = 0; 2768 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2769 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { 2770 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) 2771 return -EFAULT; 2772 ifr32++; 2773 ifr++; 2774 } 2775 2776 if (ifc32.ifcbuf == 0) { 2777 /* Translate from 64-bit structure multiple to 2778 * a 32-bit one. 2779 */ 2780 i = ifc.ifc_len; 2781 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2782 ifc32.ifc_len = i; 2783 } else { 2784 ifc32.ifc_len = i; 2785 } 2786 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2787 return -EFAULT; 2788 2789 return 0; 2790 } 2791 2792 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2793 { 2794 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2795 bool convert_in = false, convert_out = false; 2796 size_t buf_size = ALIGN(sizeof(struct ifreq), 8); 2797 struct ethtool_rxnfc __user *rxnfc; 2798 struct ifreq __user *ifr; 2799 u32 rule_cnt = 0, actual_rule_cnt; 2800 u32 ethcmd; 2801 u32 data; 2802 int ret; 2803 2804 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2805 return -EFAULT; 2806 2807 compat_rxnfc = compat_ptr(data); 2808 2809 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2810 return -EFAULT; 2811 2812 /* Most ethtool structures are defined without padding. 2813 * Unfortunately struct ethtool_rxnfc is an exception. 2814 */ 2815 switch (ethcmd) { 2816 default: 2817 break; 2818 case ETHTOOL_GRXCLSRLALL: 2819 /* Buffer size is variable */ 2820 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2821 return -EFAULT; 2822 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2823 return -ENOMEM; 2824 buf_size += rule_cnt * sizeof(u32); 2825 /* fall through */ 2826 case ETHTOOL_GRXRINGS: 2827 case ETHTOOL_GRXCLSRLCNT: 2828 case ETHTOOL_GRXCLSRULE: 2829 case ETHTOOL_SRXCLSRLINS: 2830 convert_out = true; 2831 /* fall through */ 2832 case ETHTOOL_SRXCLSRLDEL: 2833 buf_size += sizeof(struct ethtool_rxnfc); 2834 convert_in = true; 2835 break; 2836 } 2837 2838 ifr = compat_alloc_user_space(buf_size); 2839 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); 2840 2841 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2842 return -EFAULT; 2843 2844 if (put_user(convert_in ? rxnfc : compat_ptr(data), 2845 &ifr->ifr_ifru.ifru_data)) 2846 return -EFAULT; 2847 2848 if (convert_in) { 2849 /* We expect there to be holes between fs.m_ext and 2850 * fs.ring_cookie and at the end of fs, but nowhere else. 2851 */ 2852 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2853 sizeof(compat_rxnfc->fs.m_ext) != 2854 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2855 sizeof(rxnfc->fs.m_ext)); 2856 BUILD_BUG_ON( 2857 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2858 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2859 offsetof(struct ethtool_rxnfc, fs.location) - 2860 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2861 2862 if (copy_in_user(rxnfc, compat_rxnfc, 2863 (void __user *)(&rxnfc->fs.m_ext + 1) - 2864 (void __user *)rxnfc) || 2865 copy_in_user(&rxnfc->fs.ring_cookie, 2866 &compat_rxnfc->fs.ring_cookie, 2867 (void __user *)(&rxnfc->fs.location + 1) - 2868 (void __user *)&rxnfc->fs.ring_cookie) || 2869 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2870 sizeof(rxnfc->rule_cnt))) 2871 return -EFAULT; 2872 } 2873 2874 ret = dev_ioctl(net, SIOCETHTOOL, ifr); 2875 if (ret) 2876 return ret; 2877 2878 if (convert_out) { 2879 if (copy_in_user(compat_rxnfc, rxnfc, 2880 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2881 (const void __user *)rxnfc) || 2882 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2883 &rxnfc->fs.ring_cookie, 2884 (const void __user *)(&rxnfc->fs.location + 1) - 2885 (const void __user *)&rxnfc->fs.ring_cookie) || 2886 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2887 sizeof(rxnfc->rule_cnt))) 2888 return -EFAULT; 2889 2890 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2891 /* As an optimisation, we only copy the actual 2892 * number of rules that the underlying 2893 * function returned. Since Mallory might 2894 * change the rule count in user memory, we 2895 * check that it is less than the rule count 2896 * originally given (as the user buffer size), 2897 * which has been range-checked. 2898 */ 2899 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2900 return -EFAULT; 2901 if (actual_rule_cnt < rule_cnt) 2902 rule_cnt = actual_rule_cnt; 2903 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2904 &rxnfc->rule_locs[0], 2905 rule_cnt * sizeof(u32))) 2906 return -EFAULT; 2907 } 2908 } 2909 2910 return 0; 2911 } 2912 2913 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2914 { 2915 void __user *uptr; 2916 compat_uptr_t uptr32; 2917 struct ifreq __user *uifr; 2918 2919 uifr = compat_alloc_user_space(sizeof(*uifr)); 2920 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2921 return -EFAULT; 2922 2923 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2924 return -EFAULT; 2925 2926 uptr = compat_ptr(uptr32); 2927 2928 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2929 return -EFAULT; 2930 2931 return dev_ioctl(net, SIOCWANDEV, uifr); 2932 } 2933 2934 static int bond_ioctl(struct net *net, unsigned int cmd, 2935 struct compat_ifreq __user *ifr32) 2936 { 2937 struct ifreq kifr; 2938 struct ifreq __user *uifr; 2939 mm_segment_t old_fs; 2940 int err; 2941 u32 data; 2942 void __user *datap; 2943 2944 switch (cmd) { 2945 case SIOCBONDENSLAVE: 2946 case SIOCBONDRELEASE: 2947 case SIOCBONDSETHWADDR: 2948 case SIOCBONDCHANGEACTIVE: 2949 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 2950 return -EFAULT; 2951 2952 old_fs = get_fs(); 2953 set_fs(KERNEL_DS); 2954 err = dev_ioctl(net, cmd, 2955 (struct ifreq __user __force *) &kifr); 2956 set_fs(old_fs); 2957 2958 return err; 2959 case SIOCBONDSLAVEINFOQUERY: 2960 case SIOCBONDINFOQUERY: 2961 uifr = compat_alloc_user_space(sizeof(*uifr)); 2962 if (copy_in_user(&uifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2963 return -EFAULT; 2964 2965 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2966 return -EFAULT; 2967 2968 datap = compat_ptr(data); 2969 if (put_user(datap, &uifr->ifr_ifru.ifru_data)) 2970 return -EFAULT; 2971 2972 return dev_ioctl(net, cmd, uifr); 2973 default: 2974 return -ENOIOCTLCMD; 2975 } 2976 } 2977 2978 static int siocdevprivate_ioctl(struct net *net, unsigned int cmd, 2979 struct compat_ifreq __user *u_ifreq32) 2980 { 2981 struct ifreq __user *u_ifreq64; 2982 char tmp_buf[IFNAMSIZ]; 2983 void __user *data64; 2984 u32 data32; 2985 2986 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 2987 IFNAMSIZ)) 2988 return -EFAULT; 2989 if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 2990 return -EFAULT; 2991 data64 = compat_ptr(data32); 2992 2993 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 2994 2995 /* Don't check these user accesses, just let that get trapped 2996 * in the ioctl handler instead. 2997 */ 2998 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 2999 IFNAMSIZ)) 3000 return -EFAULT; 3001 if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 3002 return -EFAULT; 3003 3004 return dev_ioctl(net, cmd, u_ifreq64); 3005 } 3006 3007 static int dev_ifsioc(struct net *net, struct socket *sock, 3008 unsigned int cmd, struct compat_ifreq __user *uifr32) 3009 { 3010 struct ifreq __user *uifr; 3011 int err; 3012 3013 uifr = compat_alloc_user_space(sizeof(*uifr)); 3014 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 3015 return -EFAULT; 3016 3017 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 3018 3019 if (!err) { 3020 switch (cmd) { 3021 case SIOCGIFFLAGS: 3022 case SIOCGIFMETRIC: 3023 case SIOCGIFMTU: 3024 case SIOCGIFMEM: 3025 case SIOCGIFHWADDR: 3026 case SIOCGIFINDEX: 3027 case SIOCGIFADDR: 3028 case SIOCGIFBRDADDR: 3029 case SIOCGIFDSTADDR: 3030 case SIOCGIFNETMASK: 3031 case SIOCGIFPFLAGS: 3032 case SIOCGIFTXQLEN: 3033 case SIOCGMIIPHY: 3034 case SIOCGMIIREG: 3035 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 3036 err = -EFAULT; 3037 break; 3038 } 3039 } 3040 return err; 3041 } 3042 3043 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 3044 struct compat_ifreq __user *uifr32) 3045 { 3046 struct ifreq ifr; 3047 struct compat_ifmap __user *uifmap32; 3048 mm_segment_t old_fs; 3049 int err; 3050 3051 uifmap32 = &uifr32->ifr_ifru.ifru_map; 3052 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 3053 err |= __get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3054 err |= __get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3055 err |= __get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3056 err |= __get_user(ifr.ifr_map.irq, &uifmap32->irq); 3057 err |= __get_user(ifr.ifr_map.dma, &uifmap32->dma); 3058 err |= __get_user(ifr.ifr_map.port, &uifmap32->port); 3059 if (err) 3060 return -EFAULT; 3061 3062 old_fs = get_fs(); 3063 set_fs(KERNEL_DS); 3064 err = dev_ioctl(net, cmd, (void __user __force *)&ifr); 3065 set_fs(old_fs); 3066 3067 if (cmd == SIOCGIFMAP && !err) { 3068 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3069 err |= __put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3070 err |= __put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3071 err |= __put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3072 err |= __put_user(ifr.ifr_map.irq, &uifmap32->irq); 3073 err |= __put_user(ifr.ifr_map.dma, &uifmap32->dma); 3074 err |= __put_user(ifr.ifr_map.port, &uifmap32->port); 3075 if (err) 3076 err = -EFAULT; 3077 } 3078 return err; 3079 } 3080 3081 static int compat_siocshwtstamp(struct net *net, struct compat_ifreq __user *uifr32) 3082 { 3083 void __user *uptr; 3084 compat_uptr_t uptr32; 3085 struct ifreq __user *uifr; 3086 3087 uifr = compat_alloc_user_space(sizeof(*uifr)); 3088 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 3089 return -EFAULT; 3090 3091 if (get_user(uptr32, &uifr32->ifr_data)) 3092 return -EFAULT; 3093 3094 uptr = compat_ptr(uptr32); 3095 3096 if (put_user(uptr, &uifr->ifr_data)) 3097 return -EFAULT; 3098 3099 return dev_ioctl(net, SIOCSHWTSTAMP, uifr); 3100 } 3101 3102 struct rtentry32 { 3103 u32 rt_pad1; 3104 struct sockaddr rt_dst; /* target address */ 3105 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3106 struct sockaddr rt_genmask; /* target network mask (IP) */ 3107 unsigned short rt_flags; 3108 short rt_pad2; 3109 u32 rt_pad3; 3110 unsigned char rt_tos; 3111 unsigned char rt_class; 3112 short rt_pad4; 3113 short rt_metric; /* +1 for binary compatibility! */ 3114 /* char * */ u32 rt_dev; /* forcing the device at add */ 3115 u32 rt_mtu; /* per route MTU/Window */ 3116 u32 rt_window; /* Window clamping */ 3117 unsigned short rt_irtt; /* Initial RTT */ 3118 }; 3119 3120 struct in6_rtmsg32 { 3121 struct in6_addr rtmsg_dst; 3122 struct in6_addr rtmsg_src; 3123 struct in6_addr rtmsg_gateway; 3124 u32 rtmsg_type; 3125 u16 rtmsg_dst_len; 3126 u16 rtmsg_src_len; 3127 u32 rtmsg_metric; 3128 u32 rtmsg_info; 3129 u32 rtmsg_flags; 3130 s32 rtmsg_ifindex; 3131 }; 3132 3133 static int routing_ioctl(struct net *net, struct socket *sock, 3134 unsigned int cmd, void __user *argp) 3135 { 3136 int ret; 3137 void *r = NULL; 3138 struct in6_rtmsg r6; 3139 struct rtentry r4; 3140 char devname[16]; 3141 u32 rtdev; 3142 mm_segment_t old_fs = get_fs(); 3143 3144 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3145 struct in6_rtmsg32 __user *ur6 = argp; 3146 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3147 3 * sizeof(struct in6_addr)); 3148 ret |= __get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3149 ret |= __get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3150 ret |= __get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3151 ret |= __get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3152 ret |= __get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3153 ret |= __get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3154 ret |= __get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3155 3156 r = (void *) &r6; 3157 } else { /* ipv4 */ 3158 struct rtentry32 __user *ur4 = argp; 3159 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3160 3 * sizeof(struct sockaddr)); 3161 ret |= __get_user(r4.rt_flags, &(ur4->rt_flags)); 3162 ret |= __get_user(r4.rt_metric, &(ur4->rt_metric)); 3163 ret |= __get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3164 ret |= __get_user(r4.rt_window, &(ur4->rt_window)); 3165 ret |= __get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3166 ret |= __get_user(rtdev, &(ur4->rt_dev)); 3167 if (rtdev) { 3168 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3169 r4.rt_dev = (char __user __force *)devname; 3170 devname[15] = 0; 3171 } else 3172 r4.rt_dev = NULL; 3173 3174 r = (void *) &r4; 3175 } 3176 3177 if (ret) { 3178 ret = -EFAULT; 3179 goto out; 3180 } 3181 3182 set_fs(KERNEL_DS); 3183 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3184 set_fs(old_fs); 3185 3186 out: 3187 return ret; 3188 } 3189 3190 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3191 * for some operations; this forces use of the newer bridge-utils that 3192 * use compatible ioctls 3193 */ 3194 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3195 { 3196 compat_ulong_t tmp; 3197 3198 if (get_user(tmp, argp)) 3199 return -EFAULT; 3200 if (tmp == BRCTL_GET_VERSION) 3201 return BRCTL_VERSION + 1; 3202 return -EINVAL; 3203 } 3204 3205 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3206 unsigned int cmd, unsigned long arg) 3207 { 3208 void __user *argp = compat_ptr(arg); 3209 struct sock *sk = sock->sk; 3210 struct net *net = sock_net(sk); 3211 3212 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3213 return siocdevprivate_ioctl(net, cmd, argp); 3214 3215 switch (cmd) { 3216 case SIOCSIFBR: 3217 case SIOCGIFBR: 3218 return old_bridge_ioctl(argp); 3219 case SIOCGIFNAME: 3220 return dev_ifname32(net, argp); 3221 case SIOCGIFCONF: 3222 return dev_ifconf(net, argp); 3223 case SIOCETHTOOL: 3224 return ethtool_ioctl(net, argp); 3225 case SIOCWANDEV: 3226 return compat_siocwandev(net, argp); 3227 case SIOCGIFMAP: 3228 case SIOCSIFMAP: 3229 return compat_sioc_ifmap(net, cmd, argp); 3230 case SIOCBONDENSLAVE: 3231 case SIOCBONDRELEASE: 3232 case SIOCBONDSETHWADDR: 3233 case SIOCBONDSLAVEINFOQUERY: 3234 case SIOCBONDINFOQUERY: 3235 case SIOCBONDCHANGEACTIVE: 3236 return bond_ioctl(net, cmd, argp); 3237 case SIOCADDRT: 3238 case SIOCDELRT: 3239 return routing_ioctl(net, sock, cmd, argp); 3240 case SIOCGSTAMP: 3241 return do_siocgstamp(net, sock, cmd, argp); 3242 case SIOCGSTAMPNS: 3243 return do_siocgstampns(net, sock, cmd, argp); 3244 case SIOCSHWTSTAMP: 3245 return compat_siocshwtstamp(net, argp); 3246 3247 case FIOSETOWN: 3248 case SIOCSPGRP: 3249 case FIOGETOWN: 3250 case SIOCGPGRP: 3251 case SIOCBRADDBR: 3252 case SIOCBRDELBR: 3253 case SIOCGIFVLAN: 3254 case SIOCSIFVLAN: 3255 case SIOCADDDLCI: 3256 case SIOCDELDLCI: 3257 return sock_ioctl(file, cmd, arg); 3258 3259 case SIOCGIFFLAGS: 3260 case SIOCSIFFLAGS: 3261 case SIOCGIFMETRIC: 3262 case SIOCSIFMETRIC: 3263 case SIOCGIFMTU: 3264 case SIOCSIFMTU: 3265 case SIOCGIFMEM: 3266 case SIOCSIFMEM: 3267 case SIOCGIFHWADDR: 3268 case SIOCSIFHWADDR: 3269 case SIOCADDMULTI: 3270 case SIOCDELMULTI: 3271 case SIOCGIFINDEX: 3272 case SIOCGIFADDR: 3273 case SIOCSIFADDR: 3274 case SIOCSIFHWBROADCAST: 3275 case SIOCDIFADDR: 3276 case SIOCGIFBRDADDR: 3277 case SIOCSIFBRDADDR: 3278 case SIOCGIFDSTADDR: 3279 case SIOCSIFDSTADDR: 3280 case SIOCGIFNETMASK: 3281 case SIOCSIFNETMASK: 3282 case SIOCSIFPFLAGS: 3283 case SIOCGIFPFLAGS: 3284 case SIOCGIFTXQLEN: 3285 case SIOCSIFTXQLEN: 3286 case SIOCBRADDIF: 3287 case SIOCBRDELIF: 3288 case SIOCSIFNAME: 3289 case SIOCGMIIPHY: 3290 case SIOCGMIIREG: 3291 case SIOCSMIIREG: 3292 return dev_ifsioc(net, sock, cmd, argp); 3293 3294 case SIOCSARP: 3295 case SIOCGARP: 3296 case SIOCDARP: 3297 case SIOCATMARK: 3298 return sock_do_ioctl(net, sock, cmd, arg); 3299 } 3300 3301 return -ENOIOCTLCMD; 3302 } 3303 3304 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3305 unsigned long arg) 3306 { 3307 struct socket *sock = file->private_data; 3308 int ret = -ENOIOCTLCMD; 3309 struct sock *sk; 3310 struct net *net; 3311 3312 sk = sock->sk; 3313 net = sock_net(sk); 3314 3315 if (sock->ops->compat_ioctl) 3316 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3317 3318 if (ret == -ENOIOCTLCMD && 3319 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3320 ret = compat_wext_handle_ioctl(net, cmd, arg); 3321 3322 if (ret == -ENOIOCTLCMD) 3323 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3324 3325 return ret; 3326 } 3327 #endif 3328 3329 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3330 { 3331 return sock->ops->bind(sock, addr, addrlen); 3332 } 3333 EXPORT_SYMBOL(kernel_bind); 3334 3335 int kernel_listen(struct socket *sock, int backlog) 3336 { 3337 return sock->ops->listen(sock, backlog); 3338 } 3339 EXPORT_SYMBOL(kernel_listen); 3340 3341 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3342 { 3343 struct sock *sk = sock->sk; 3344 int err; 3345 3346 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3347 newsock); 3348 if (err < 0) 3349 goto done; 3350 3351 err = sock->ops->accept(sock, *newsock, flags); 3352 if (err < 0) { 3353 sock_release(*newsock); 3354 *newsock = NULL; 3355 goto done; 3356 } 3357 3358 (*newsock)->ops = sock->ops; 3359 __module_get((*newsock)->ops->owner); 3360 3361 done: 3362 return err; 3363 } 3364 EXPORT_SYMBOL(kernel_accept); 3365 3366 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3367 int flags) 3368 { 3369 return sock->ops->connect(sock, addr, addrlen, flags); 3370 } 3371 EXPORT_SYMBOL(kernel_connect); 3372 3373 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3374 int *addrlen) 3375 { 3376 return sock->ops->getname(sock, addr, addrlen, 0); 3377 } 3378 EXPORT_SYMBOL(kernel_getsockname); 3379 3380 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3381 int *addrlen) 3382 { 3383 return sock->ops->getname(sock, addr, addrlen, 1); 3384 } 3385 EXPORT_SYMBOL(kernel_getpeername); 3386 3387 int kernel_getsockopt(struct socket *sock, int level, int optname, 3388 char *optval, int *optlen) 3389 { 3390 mm_segment_t oldfs = get_fs(); 3391 char __user *uoptval; 3392 int __user *uoptlen; 3393 int err; 3394 3395 uoptval = (char __user __force *) optval; 3396 uoptlen = (int __user __force *) optlen; 3397 3398 set_fs(KERNEL_DS); 3399 if (level == SOL_SOCKET) 3400 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3401 else 3402 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3403 uoptlen); 3404 set_fs(oldfs); 3405 return err; 3406 } 3407 EXPORT_SYMBOL(kernel_getsockopt); 3408 3409 int kernel_setsockopt(struct socket *sock, int level, int optname, 3410 char *optval, unsigned int optlen) 3411 { 3412 mm_segment_t oldfs = get_fs(); 3413 char __user *uoptval; 3414 int err; 3415 3416 uoptval = (char __user __force *) optval; 3417 3418 set_fs(KERNEL_DS); 3419 if (level == SOL_SOCKET) 3420 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3421 else 3422 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3423 optlen); 3424 set_fs(oldfs); 3425 return err; 3426 } 3427 EXPORT_SYMBOL(kernel_setsockopt); 3428 3429 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3430 size_t size, int flags) 3431 { 3432 if (sock->ops->sendpage) 3433 return sock->ops->sendpage(sock, page, offset, size, flags); 3434 3435 return sock_no_sendpage(sock, page, offset, size, flags); 3436 } 3437 EXPORT_SYMBOL(kernel_sendpage); 3438 3439 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3440 { 3441 mm_segment_t oldfs = get_fs(); 3442 int err; 3443 3444 set_fs(KERNEL_DS); 3445 err = sock->ops->ioctl(sock, cmd, arg); 3446 set_fs(oldfs); 3447 3448 return err; 3449 } 3450 EXPORT_SYMBOL(kernel_sock_ioctl); 3451 3452 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3453 { 3454 return sock->ops->shutdown(sock, how); 3455 } 3456 EXPORT_SYMBOL(kernel_sock_shutdown); 3457