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/ptp_classify.h> 76 #include <linux/init.h> 77 #include <linux/poll.h> 78 #include <linux/cache.h> 79 #include <linux/module.h> 80 #include <linux/highmem.h> 81 #include <linux/mount.h> 82 #include <linux/security.h> 83 #include <linux/syscalls.h> 84 #include <linux/compat.h> 85 #include <linux/kmod.h> 86 #include <linux/audit.h> 87 #include <linux/wireless.h> 88 #include <linux/nsproxy.h> 89 #include <linux/magic.h> 90 #include <linux/slab.h> 91 #include <linux/xattr.h> 92 93 #include <asm/uaccess.h> 94 #include <asm/unistd.h> 95 96 #include <net/compat.h> 97 #include <net/wext.h> 98 #include <net/cls_cgroup.h> 99 100 #include <net/sock.h> 101 #include <linux/netfilter.h> 102 103 #include <linux/if_tun.h> 104 #include <linux/ipv6_route.h> 105 #include <linux/route.h> 106 #include <linux/sockios.h> 107 #include <linux/atalk.h> 108 #include <net/busy_poll.h> 109 #include <linux/errqueue.h> 110 111 #ifdef CONFIG_NET_RX_BUSY_POLL 112 unsigned int sysctl_net_busy_read __read_mostly; 113 unsigned int sysctl_net_busy_poll __read_mostly; 114 #endif 115 116 static int sock_no_open(struct inode *irrelevant, struct file *dontcare); 117 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 118 unsigned long nr_segs, loff_t pos); 119 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 120 unsigned long nr_segs, loff_t pos); 121 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 122 123 static int sock_close(struct inode *inode, struct file *file); 124 static unsigned int sock_poll(struct file *file, 125 struct poll_table_struct *wait); 126 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 127 #ifdef CONFIG_COMPAT 128 static long compat_sock_ioctl(struct file *file, 129 unsigned int cmd, unsigned long arg); 130 #endif 131 static int sock_fasync(int fd, struct file *filp, int on); 132 static ssize_t sock_sendpage(struct file *file, struct page *page, 133 int offset, size_t size, loff_t *ppos, int more); 134 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 135 struct pipe_inode_info *pipe, size_t len, 136 unsigned int flags); 137 138 /* 139 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 140 * in the operation structures but are done directly via the socketcall() multiplexor. 141 */ 142 143 static const struct file_operations socket_file_ops = { 144 .owner = THIS_MODULE, 145 .llseek = no_llseek, 146 .aio_read = sock_aio_read, 147 .aio_write = sock_aio_write, 148 .poll = sock_poll, 149 .unlocked_ioctl = sock_ioctl, 150 #ifdef CONFIG_COMPAT 151 .compat_ioctl = compat_sock_ioctl, 152 #endif 153 .mmap = sock_mmap, 154 .open = sock_no_open, /* special open code to disallow open via /proc */ 155 .release = sock_close, 156 .fasync = sock_fasync, 157 .sendpage = sock_sendpage, 158 .splice_write = generic_splice_sendpage, 159 .splice_read = sock_splice_read, 160 }; 161 162 /* 163 * The protocol list. Each protocol is registered in here. 164 */ 165 166 static DEFINE_SPINLOCK(net_family_lock); 167 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 168 169 /* 170 * Statistics counters of the socket lists 171 */ 172 173 static DEFINE_PER_CPU(int, sockets_in_use); 174 175 /* 176 * Support routines. 177 * Move socket addresses back and forth across the kernel/user 178 * divide and look after the messy bits. 179 */ 180 181 /** 182 * move_addr_to_kernel - copy a socket address into kernel space 183 * @uaddr: Address in user space 184 * @kaddr: Address in kernel space 185 * @ulen: Length in user space 186 * 187 * The address is copied into kernel space. If the provided address is 188 * too long an error code of -EINVAL is returned. If the copy gives 189 * invalid addresses -EFAULT is returned. On a success 0 is returned. 190 */ 191 192 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 193 { 194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 195 return -EINVAL; 196 if (ulen == 0) 197 return 0; 198 if (copy_from_user(kaddr, uaddr, ulen)) 199 return -EFAULT; 200 return audit_sockaddr(ulen, kaddr); 201 } 202 203 /** 204 * move_addr_to_user - copy an address to user space 205 * @kaddr: kernel space address 206 * @klen: length of address in kernel 207 * @uaddr: user space address 208 * @ulen: pointer to user length field 209 * 210 * The value pointed to by ulen on entry is the buffer length available. 211 * This is overwritten with the buffer space used. -EINVAL is returned 212 * if an overlong buffer is specified or a negative buffer size. -EFAULT 213 * is returned if either the buffer or the length field are not 214 * accessible. 215 * After copying the data up to the limit the user specifies, the true 216 * length of the data is written over the length limit the user 217 * specified. Zero is returned for a success. 218 */ 219 220 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 221 void __user *uaddr, int __user *ulen) 222 { 223 int err; 224 int len; 225 226 BUG_ON(klen > sizeof(struct sockaddr_storage)); 227 err = get_user(len, ulen); 228 if (err) 229 return err; 230 if (len > klen) 231 len = klen; 232 if (len < 0) 233 return -EINVAL; 234 if (len) { 235 if (audit_sockaddr(klen, kaddr)) 236 return -ENOMEM; 237 if (copy_to_user(uaddr, kaddr, len)) 238 return -EFAULT; 239 } 240 /* 241 * "fromlen shall refer to the value before truncation.." 242 * 1003.1g 243 */ 244 return __put_user(klen, ulen); 245 } 246 247 static struct kmem_cache *sock_inode_cachep __read_mostly; 248 249 static struct inode *sock_alloc_inode(struct super_block *sb) 250 { 251 struct socket_alloc *ei; 252 struct socket_wq *wq; 253 254 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 255 if (!ei) 256 return NULL; 257 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 258 if (!wq) { 259 kmem_cache_free(sock_inode_cachep, ei); 260 return NULL; 261 } 262 init_waitqueue_head(&wq->wait); 263 wq->fasync_list = NULL; 264 RCU_INIT_POINTER(ei->socket.wq, wq); 265 266 ei->socket.state = SS_UNCONNECTED; 267 ei->socket.flags = 0; 268 ei->socket.ops = NULL; 269 ei->socket.sk = NULL; 270 ei->socket.file = NULL; 271 272 return &ei->vfs_inode; 273 } 274 275 static void sock_destroy_inode(struct inode *inode) 276 { 277 struct socket_alloc *ei; 278 struct socket_wq *wq; 279 280 ei = container_of(inode, struct socket_alloc, vfs_inode); 281 wq = rcu_dereference_protected(ei->socket.wq, 1); 282 kfree_rcu(wq, rcu); 283 kmem_cache_free(sock_inode_cachep, ei); 284 } 285 286 static void init_once(void *foo) 287 { 288 struct socket_alloc *ei = (struct socket_alloc *)foo; 289 290 inode_init_once(&ei->vfs_inode); 291 } 292 293 static int init_inodecache(void) 294 { 295 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 296 sizeof(struct socket_alloc), 297 0, 298 (SLAB_HWCACHE_ALIGN | 299 SLAB_RECLAIM_ACCOUNT | 300 SLAB_MEM_SPREAD), 301 init_once); 302 if (sock_inode_cachep == NULL) 303 return -ENOMEM; 304 return 0; 305 } 306 307 static const struct super_operations sockfs_ops = { 308 .alloc_inode = sock_alloc_inode, 309 .destroy_inode = sock_destroy_inode, 310 .statfs = simple_statfs, 311 }; 312 313 /* 314 * sockfs_dname() is called from d_path(). 315 */ 316 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 317 { 318 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 319 dentry->d_inode->i_ino); 320 } 321 322 static const struct dentry_operations sockfs_dentry_operations = { 323 .d_dname = sockfs_dname, 324 }; 325 326 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 327 int flags, const char *dev_name, void *data) 328 { 329 return mount_pseudo(fs_type, "socket:", &sockfs_ops, 330 &sockfs_dentry_operations, SOCKFS_MAGIC); 331 } 332 333 static struct vfsmount *sock_mnt __read_mostly; 334 335 static struct file_system_type sock_fs_type = { 336 .name = "sockfs", 337 .mount = sockfs_mount, 338 .kill_sb = kill_anon_super, 339 }; 340 341 /* 342 * Obtains the first available file descriptor and sets it up for use. 343 * 344 * These functions create file structures and maps them to fd space 345 * of the current process. On success it returns file descriptor 346 * and file struct implicitly stored in sock->file. 347 * Note that another thread may close file descriptor before we return 348 * from this function. We use the fact that now we do not refer 349 * to socket after mapping. If one day we will need it, this 350 * function will increment ref. count on file by 1. 351 * 352 * In any case returned fd MAY BE not valid! 353 * This race condition is unavoidable 354 * with shared fd spaces, we cannot solve it inside kernel, 355 * but we take care of internal coherence yet. 356 */ 357 358 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 359 { 360 struct qstr name = { .name = "" }; 361 struct path path; 362 struct file *file; 363 364 if (dname) { 365 name.name = dname; 366 name.len = strlen(name.name); 367 } else if (sock->sk) { 368 name.name = sock->sk->sk_prot_creator->name; 369 name.len = strlen(name.name); 370 } 371 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 372 if (unlikely(!path.dentry)) 373 return ERR_PTR(-ENOMEM); 374 path.mnt = mntget(sock_mnt); 375 376 d_instantiate(path.dentry, SOCK_INODE(sock)); 377 SOCK_INODE(sock)->i_fop = &socket_file_ops; 378 379 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 380 &socket_file_ops); 381 if (unlikely(IS_ERR(file))) { 382 /* drop dentry, keep inode */ 383 ihold(path.dentry->d_inode); 384 path_put(&path); 385 return file; 386 } 387 388 sock->file = file; 389 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 390 file->private_data = sock; 391 return file; 392 } 393 EXPORT_SYMBOL(sock_alloc_file); 394 395 static int sock_map_fd(struct socket *sock, int flags) 396 { 397 struct file *newfile; 398 int fd = get_unused_fd_flags(flags); 399 if (unlikely(fd < 0)) 400 return fd; 401 402 newfile = sock_alloc_file(sock, flags, NULL); 403 if (likely(!IS_ERR(newfile))) { 404 fd_install(fd, newfile); 405 return fd; 406 } 407 408 put_unused_fd(fd); 409 return PTR_ERR(newfile); 410 } 411 412 struct socket *sock_from_file(struct file *file, int *err) 413 { 414 if (file->f_op == &socket_file_ops) 415 return file->private_data; /* set in sock_map_fd */ 416 417 *err = -ENOTSOCK; 418 return NULL; 419 } 420 EXPORT_SYMBOL(sock_from_file); 421 422 /** 423 * sockfd_lookup - Go from a file number to its socket slot 424 * @fd: file handle 425 * @err: pointer to an error code return 426 * 427 * The file handle passed in is locked and the socket it is bound 428 * too is returned. If an error occurs the err pointer is overwritten 429 * with a negative errno code and NULL is returned. The function checks 430 * for both invalid handles and passing a handle which is not a socket. 431 * 432 * On a success the socket object pointer is returned. 433 */ 434 435 struct socket *sockfd_lookup(int fd, int *err) 436 { 437 struct file *file; 438 struct socket *sock; 439 440 file = fget(fd); 441 if (!file) { 442 *err = -EBADF; 443 return NULL; 444 } 445 446 sock = sock_from_file(file, err); 447 if (!sock) 448 fput(file); 449 return sock; 450 } 451 EXPORT_SYMBOL(sockfd_lookup); 452 453 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 454 { 455 struct fd f = fdget(fd); 456 struct socket *sock; 457 458 *err = -EBADF; 459 if (f.file) { 460 sock = sock_from_file(f.file, err); 461 if (likely(sock)) { 462 *fput_needed = f.flags; 463 return sock; 464 } 465 fdput(f); 466 } 467 return NULL; 468 } 469 470 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 471 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 472 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 473 static ssize_t sockfs_getxattr(struct dentry *dentry, 474 const char *name, void *value, size_t size) 475 { 476 const char *proto_name; 477 size_t proto_size; 478 int error; 479 480 error = -ENODATA; 481 if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) { 482 proto_name = dentry->d_name.name; 483 proto_size = strlen(proto_name); 484 485 if (value) { 486 error = -ERANGE; 487 if (proto_size + 1 > size) 488 goto out; 489 490 strncpy(value, proto_name, proto_size + 1); 491 } 492 error = proto_size + 1; 493 } 494 495 out: 496 return error; 497 } 498 499 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 500 size_t size) 501 { 502 ssize_t len; 503 ssize_t used = 0; 504 505 len = security_inode_listsecurity(dentry->d_inode, buffer, size); 506 if (len < 0) 507 return len; 508 used += len; 509 if (buffer) { 510 if (size < used) 511 return -ERANGE; 512 buffer += len; 513 } 514 515 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 516 used += len; 517 if (buffer) { 518 if (size < used) 519 return -ERANGE; 520 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 521 buffer += len; 522 } 523 524 return used; 525 } 526 527 static const struct inode_operations sockfs_inode_ops = { 528 .getxattr = sockfs_getxattr, 529 .listxattr = sockfs_listxattr, 530 }; 531 532 /** 533 * sock_alloc - allocate a socket 534 * 535 * Allocate a new inode and socket object. The two are bound together 536 * and initialised. The socket is then returned. If we are out of inodes 537 * NULL is returned. 538 */ 539 540 static struct socket *sock_alloc(void) 541 { 542 struct inode *inode; 543 struct socket *sock; 544 545 inode = new_inode_pseudo(sock_mnt->mnt_sb); 546 if (!inode) 547 return NULL; 548 549 sock = SOCKET_I(inode); 550 551 kmemcheck_annotate_bitfield(sock, type); 552 inode->i_ino = get_next_ino(); 553 inode->i_mode = S_IFSOCK | S_IRWXUGO; 554 inode->i_uid = current_fsuid(); 555 inode->i_gid = current_fsgid(); 556 inode->i_op = &sockfs_inode_ops; 557 558 this_cpu_add(sockets_in_use, 1); 559 return sock; 560 } 561 562 /* 563 * In theory you can't get an open on this inode, but /proc provides 564 * a back door. Remember to keep it shut otherwise you'll let the 565 * creepy crawlies in. 566 */ 567 568 static int sock_no_open(struct inode *irrelevant, struct file *dontcare) 569 { 570 return -ENXIO; 571 } 572 573 const struct file_operations bad_sock_fops = { 574 .owner = THIS_MODULE, 575 .open = sock_no_open, 576 .llseek = noop_llseek, 577 }; 578 579 /** 580 * sock_release - close a socket 581 * @sock: socket to close 582 * 583 * The socket is released from the protocol stack if it has a release 584 * callback, and the inode is then released if the socket is bound to 585 * an inode not a file. 586 */ 587 588 void sock_release(struct socket *sock) 589 { 590 if (sock->ops) { 591 struct module *owner = sock->ops->owner; 592 593 sock->ops->release(sock); 594 sock->ops = NULL; 595 module_put(owner); 596 } 597 598 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 599 pr_err("%s: fasync list not empty!\n", __func__); 600 601 if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags)) 602 return; 603 604 this_cpu_sub(sockets_in_use, 1); 605 if (!sock->file) { 606 iput(SOCK_INODE(sock)); 607 return; 608 } 609 sock->file = NULL; 610 } 611 EXPORT_SYMBOL(sock_release); 612 613 void sock_tx_timestamp(const struct sock *sk, __u8 *tx_flags) 614 { 615 u8 flags = *tx_flags; 616 617 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 618 flags |= SKBTX_HW_TSTAMP; 619 620 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 621 flags |= SKBTX_SW_TSTAMP; 622 623 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED) 624 flags |= SKBTX_SCHED_TSTAMP; 625 626 if (sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK) 627 flags |= SKBTX_ACK_TSTAMP; 628 629 if (sock_flag(sk, SOCK_WIFI_STATUS)) 630 flags |= SKBTX_WIFI_STATUS; 631 632 *tx_flags = flags; 633 } 634 EXPORT_SYMBOL(sock_tx_timestamp); 635 636 static inline int __sock_sendmsg_nosec(struct kiocb *iocb, struct socket *sock, 637 struct msghdr *msg, size_t size) 638 { 639 struct sock_iocb *si = kiocb_to_siocb(iocb); 640 641 si->sock = sock; 642 si->scm = NULL; 643 si->msg = msg; 644 si->size = size; 645 646 return sock->ops->sendmsg(iocb, sock, msg, size); 647 } 648 649 static inline int __sock_sendmsg(struct kiocb *iocb, struct socket *sock, 650 struct msghdr *msg, size_t size) 651 { 652 int err = security_socket_sendmsg(sock, msg, size); 653 654 return err ?: __sock_sendmsg_nosec(iocb, sock, msg, size); 655 } 656 657 int sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) 658 { 659 struct kiocb iocb; 660 struct sock_iocb siocb; 661 int ret; 662 663 init_sync_kiocb(&iocb, NULL); 664 iocb.private = &siocb; 665 ret = __sock_sendmsg(&iocb, sock, msg, size); 666 if (-EIOCBQUEUED == ret) 667 ret = wait_on_sync_kiocb(&iocb); 668 return ret; 669 } 670 EXPORT_SYMBOL(sock_sendmsg); 671 672 static int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg, size_t size) 673 { 674 struct kiocb iocb; 675 struct sock_iocb siocb; 676 int ret; 677 678 init_sync_kiocb(&iocb, NULL); 679 iocb.private = &siocb; 680 ret = __sock_sendmsg_nosec(&iocb, sock, msg, size); 681 if (-EIOCBQUEUED == ret) 682 ret = wait_on_sync_kiocb(&iocb); 683 return ret; 684 } 685 686 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 687 struct kvec *vec, size_t num, size_t size) 688 { 689 mm_segment_t oldfs = get_fs(); 690 int result; 691 692 set_fs(KERNEL_DS); 693 /* 694 * the following is safe, since for compiler definitions of kvec and 695 * iovec are identical, yielding the same in-core layout and alignment 696 */ 697 msg->msg_iov = (struct iovec *)vec; 698 msg->msg_iovlen = num; 699 result = sock_sendmsg(sock, msg, size); 700 set_fs(oldfs); 701 return result; 702 } 703 EXPORT_SYMBOL(kernel_sendmsg); 704 705 /* 706 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 707 */ 708 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 709 struct sk_buff *skb) 710 { 711 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 712 struct scm_timestamping tss; 713 int empty = 1; 714 struct skb_shared_hwtstamps *shhwtstamps = 715 skb_hwtstamps(skb); 716 717 /* Race occurred between timestamp enabling and packet 718 receiving. Fill in the current time for now. */ 719 if (need_software_tstamp && skb->tstamp.tv64 == 0) 720 __net_timestamp(skb); 721 722 if (need_software_tstamp) { 723 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 724 struct timeval tv; 725 skb_get_timestamp(skb, &tv); 726 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 727 sizeof(tv), &tv); 728 } else { 729 struct timespec ts; 730 skb_get_timestampns(skb, &ts); 731 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 732 sizeof(ts), &ts); 733 } 734 } 735 736 memset(&tss, 0, sizeof(tss)); 737 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 738 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 739 empty = 0; 740 if (shhwtstamps && 741 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 742 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) 743 empty = 0; 744 if (!empty) 745 put_cmsg(msg, SOL_SOCKET, 746 SCM_TIMESTAMPING, sizeof(tss), &tss); 747 } 748 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 749 750 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 751 struct sk_buff *skb) 752 { 753 int ack; 754 755 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 756 return; 757 if (!skb->wifi_acked_valid) 758 return; 759 760 ack = skb->wifi_acked; 761 762 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 763 } 764 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 765 766 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 767 struct sk_buff *skb) 768 { 769 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && skb->dropcount) 770 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 771 sizeof(__u32), &skb->dropcount); 772 } 773 774 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 775 struct sk_buff *skb) 776 { 777 sock_recv_timestamp(msg, sk, skb); 778 sock_recv_drops(msg, sk, skb); 779 } 780 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 781 782 static inline int __sock_recvmsg_nosec(struct kiocb *iocb, struct socket *sock, 783 struct msghdr *msg, size_t size, int flags) 784 { 785 struct sock_iocb *si = kiocb_to_siocb(iocb); 786 787 si->sock = sock; 788 si->scm = NULL; 789 si->msg = msg; 790 si->size = size; 791 si->flags = flags; 792 793 return sock->ops->recvmsg(iocb, sock, msg, size, flags); 794 } 795 796 static inline int __sock_recvmsg(struct kiocb *iocb, struct socket *sock, 797 struct msghdr *msg, size_t size, int flags) 798 { 799 int err = security_socket_recvmsg(sock, msg, size, flags); 800 801 return err ?: __sock_recvmsg_nosec(iocb, sock, msg, size, flags); 802 } 803 804 int sock_recvmsg(struct socket *sock, struct msghdr *msg, 805 size_t size, int flags) 806 { 807 struct kiocb iocb; 808 struct sock_iocb siocb; 809 int ret; 810 811 init_sync_kiocb(&iocb, NULL); 812 iocb.private = &siocb; 813 ret = __sock_recvmsg(&iocb, sock, msg, size, flags); 814 if (-EIOCBQUEUED == ret) 815 ret = wait_on_sync_kiocb(&iocb); 816 return ret; 817 } 818 EXPORT_SYMBOL(sock_recvmsg); 819 820 static int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 821 size_t size, int flags) 822 { 823 struct kiocb iocb; 824 struct sock_iocb siocb; 825 int ret; 826 827 init_sync_kiocb(&iocb, NULL); 828 iocb.private = &siocb; 829 ret = __sock_recvmsg_nosec(&iocb, sock, msg, size, flags); 830 if (-EIOCBQUEUED == ret) 831 ret = wait_on_sync_kiocb(&iocb); 832 return ret; 833 } 834 835 /** 836 * kernel_recvmsg - Receive a message from a socket (kernel space) 837 * @sock: The socket to receive the message from 838 * @msg: Received message 839 * @vec: Input s/g array for message data 840 * @num: Size of input s/g array 841 * @size: Number of bytes to read 842 * @flags: Message flags (MSG_DONTWAIT, etc...) 843 * 844 * On return the msg structure contains the scatter/gather array passed in the 845 * vec argument. The array is modified so that it consists of the unfilled 846 * portion of the original array. 847 * 848 * The returned value is the total number of bytes received, or an error. 849 */ 850 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 851 struct kvec *vec, size_t num, size_t size, int flags) 852 { 853 mm_segment_t oldfs = get_fs(); 854 int result; 855 856 set_fs(KERNEL_DS); 857 /* 858 * the following is safe, since for compiler definitions of kvec and 859 * iovec are identical, yielding the same in-core layout and alignment 860 */ 861 msg->msg_iov = (struct iovec *)vec, msg->msg_iovlen = num; 862 result = sock_recvmsg(sock, msg, size, flags); 863 set_fs(oldfs); 864 return result; 865 } 866 EXPORT_SYMBOL(kernel_recvmsg); 867 868 static ssize_t sock_sendpage(struct file *file, struct page *page, 869 int offset, size_t size, loff_t *ppos, int more) 870 { 871 struct socket *sock; 872 int flags; 873 874 sock = file->private_data; 875 876 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 877 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 878 flags |= more; 879 880 return kernel_sendpage(sock, page, offset, size, flags); 881 } 882 883 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 884 struct pipe_inode_info *pipe, size_t len, 885 unsigned int flags) 886 { 887 struct socket *sock = file->private_data; 888 889 if (unlikely(!sock->ops->splice_read)) 890 return -EINVAL; 891 892 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 893 } 894 895 static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb, 896 struct sock_iocb *siocb) 897 { 898 if (!is_sync_kiocb(iocb)) 899 BUG(); 900 901 siocb->kiocb = iocb; 902 iocb->private = siocb; 903 return siocb; 904 } 905 906 static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb, 907 struct file *file, const struct iovec *iov, 908 unsigned long nr_segs) 909 { 910 struct socket *sock = file->private_data; 911 size_t size = 0; 912 int i; 913 914 for (i = 0; i < nr_segs; i++) 915 size += iov[i].iov_len; 916 917 msg->msg_name = NULL; 918 msg->msg_namelen = 0; 919 msg->msg_control = NULL; 920 msg->msg_controllen = 0; 921 msg->msg_iov = (struct iovec *)iov; 922 msg->msg_iovlen = nr_segs; 923 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 924 925 return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags); 926 } 927 928 static ssize_t sock_aio_read(struct kiocb *iocb, const struct iovec *iov, 929 unsigned long nr_segs, loff_t pos) 930 { 931 struct sock_iocb siocb, *x; 932 933 if (pos != 0) 934 return -ESPIPE; 935 936 if (iocb->ki_nbytes == 0) /* Match SYS5 behaviour */ 937 return 0; 938 939 940 x = alloc_sock_iocb(iocb, &siocb); 941 if (!x) 942 return -ENOMEM; 943 return do_sock_read(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 944 } 945 946 static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb, 947 struct file *file, const struct iovec *iov, 948 unsigned long nr_segs) 949 { 950 struct socket *sock = file->private_data; 951 size_t size = 0; 952 int i; 953 954 for (i = 0; i < nr_segs; i++) 955 size += iov[i].iov_len; 956 957 msg->msg_name = NULL; 958 msg->msg_namelen = 0; 959 msg->msg_control = NULL; 960 msg->msg_controllen = 0; 961 msg->msg_iov = (struct iovec *)iov; 962 msg->msg_iovlen = nr_segs; 963 msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 964 if (sock->type == SOCK_SEQPACKET) 965 msg->msg_flags |= MSG_EOR; 966 967 return __sock_sendmsg(iocb, sock, msg, size); 968 } 969 970 static ssize_t sock_aio_write(struct kiocb *iocb, const struct iovec *iov, 971 unsigned long nr_segs, loff_t pos) 972 { 973 struct sock_iocb siocb, *x; 974 975 if (pos != 0) 976 return -ESPIPE; 977 978 x = alloc_sock_iocb(iocb, &siocb); 979 if (!x) 980 return -ENOMEM; 981 982 return do_sock_write(&x->async_msg, iocb, iocb->ki_filp, iov, nr_segs); 983 } 984 985 /* 986 * Atomic setting of ioctl hooks to avoid race 987 * with module unload. 988 */ 989 990 static DEFINE_MUTEX(br_ioctl_mutex); 991 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 992 993 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 994 { 995 mutex_lock(&br_ioctl_mutex); 996 br_ioctl_hook = hook; 997 mutex_unlock(&br_ioctl_mutex); 998 } 999 EXPORT_SYMBOL(brioctl_set); 1000 1001 static DEFINE_MUTEX(vlan_ioctl_mutex); 1002 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 1003 1004 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 1005 { 1006 mutex_lock(&vlan_ioctl_mutex); 1007 vlan_ioctl_hook = hook; 1008 mutex_unlock(&vlan_ioctl_mutex); 1009 } 1010 EXPORT_SYMBOL(vlan_ioctl_set); 1011 1012 static DEFINE_MUTEX(dlci_ioctl_mutex); 1013 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 1014 1015 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 1016 { 1017 mutex_lock(&dlci_ioctl_mutex); 1018 dlci_ioctl_hook = hook; 1019 mutex_unlock(&dlci_ioctl_mutex); 1020 } 1021 EXPORT_SYMBOL(dlci_ioctl_set); 1022 1023 static long sock_do_ioctl(struct net *net, struct socket *sock, 1024 unsigned int cmd, unsigned long arg) 1025 { 1026 int err; 1027 void __user *argp = (void __user *)arg; 1028 1029 err = sock->ops->ioctl(sock, cmd, arg); 1030 1031 /* 1032 * If this ioctl is unknown try to hand it down 1033 * to the NIC driver. 1034 */ 1035 if (err == -ENOIOCTLCMD) 1036 err = dev_ioctl(net, cmd, argp); 1037 1038 return err; 1039 } 1040 1041 /* 1042 * With an ioctl, arg may well be a user mode pointer, but we don't know 1043 * what to do with it - that's up to the protocol still. 1044 */ 1045 1046 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 1047 { 1048 struct socket *sock; 1049 struct sock *sk; 1050 void __user *argp = (void __user *)arg; 1051 int pid, err; 1052 struct net *net; 1053 1054 sock = file->private_data; 1055 sk = sock->sk; 1056 net = sock_net(sk); 1057 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 1058 err = dev_ioctl(net, cmd, argp); 1059 } else 1060 #ifdef CONFIG_WEXT_CORE 1061 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1062 err = dev_ioctl(net, cmd, argp); 1063 } else 1064 #endif 1065 switch (cmd) { 1066 case FIOSETOWN: 1067 case SIOCSPGRP: 1068 err = -EFAULT; 1069 if (get_user(pid, (int __user *)argp)) 1070 break; 1071 err = f_setown(sock->file, pid, 1); 1072 break; 1073 case FIOGETOWN: 1074 case SIOCGPGRP: 1075 err = put_user(f_getown(sock->file), 1076 (int __user *)argp); 1077 break; 1078 case SIOCGIFBR: 1079 case SIOCSIFBR: 1080 case SIOCBRADDBR: 1081 case SIOCBRDELBR: 1082 err = -ENOPKG; 1083 if (!br_ioctl_hook) 1084 request_module("bridge"); 1085 1086 mutex_lock(&br_ioctl_mutex); 1087 if (br_ioctl_hook) 1088 err = br_ioctl_hook(net, cmd, argp); 1089 mutex_unlock(&br_ioctl_mutex); 1090 break; 1091 case SIOCGIFVLAN: 1092 case SIOCSIFVLAN: 1093 err = -ENOPKG; 1094 if (!vlan_ioctl_hook) 1095 request_module("8021q"); 1096 1097 mutex_lock(&vlan_ioctl_mutex); 1098 if (vlan_ioctl_hook) 1099 err = vlan_ioctl_hook(net, argp); 1100 mutex_unlock(&vlan_ioctl_mutex); 1101 break; 1102 case SIOCADDDLCI: 1103 case SIOCDELDLCI: 1104 err = -ENOPKG; 1105 if (!dlci_ioctl_hook) 1106 request_module("dlci"); 1107 1108 mutex_lock(&dlci_ioctl_mutex); 1109 if (dlci_ioctl_hook) 1110 err = dlci_ioctl_hook(cmd, argp); 1111 mutex_unlock(&dlci_ioctl_mutex); 1112 break; 1113 default: 1114 err = sock_do_ioctl(net, sock, cmd, arg); 1115 break; 1116 } 1117 return err; 1118 } 1119 1120 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1121 { 1122 int err; 1123 struct socket *sock = NULL; 1124 1125 err = security_socket_create(family, type, protocol, 1); 1126 if (err) 1127 goto out; 1128 1129 sock = sock_alloc(); 1130 if (!sock) { 1131 err = -ENOMEM; 1132 goto out; 1133 } 1134 1135 sock->type = type; 1136 err = security_socket_post_create(sock, family, type, protocol, 1); 1137 if (err) 1138 goto out_release; 1139 1140 out: 1141 *res = sock; 1142 return err; 1143 out_release: 1144 sock_release(sock); 1145 sock = NULL; 1146 goto out; 1147 } 1148 EXPORT_SYMBOL(sock_create_lite); 1149 1150 /* No kernel lock held - perfect */ 1151 static unsigned int sock_poll(struct file *file, poll_table *wait) 1152 { 1153 unsigned int busy_flag = 0; 1154 struct socket *sock; 1155 1156 /* 1157 * We can't return errors to poll, so it's either yes or no. 1158 */ 1159 sock = file->private_data; 1160 1161 if (sk_can_busy_loop(sock->sk)) { 1162 /* this socket can poll_ll so tell the system call */ 1163 busy_flag = POLL_BUSY_LOOP; 1164 1165 /* once, only if requested by syscall */ 1166 if (wait && (wait->_key & POLL_BUSY_LOOP)) 1167 sk_busy_loop(sock->sk, 1); 1168 } 1169 1170 return busy_flag | sock->ops->poll(file, sock, wait); 1171 } 1172 1173 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1174 { 1175 struct socket *sock = file->private_data; 1176 1177 return sock->ops->mmap(file, sock, vma); 1178 } 1179 1180 static int sock_close(struct inode *inode, struct file *filp) 1181 { 1182 sock_release(SOCKET_I(inode)); 1183 return 0; 1184 } 1185 1186 /* 1187 * Update the socket async list 1188 * 1189 * Fasync_list locking strategy. 1190 * 1191 * 1. fasync_list is modified only under process context socket lock 1192 * i.e. under semaphore. 1193 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1194 * or under socket lock 1195 */ 1196 1197 static int sock_fasync(int fd, struct file *filp, int on) 1198 { 1199 struct socket *sock = filp->private_data; 1200 struct sock *sk = sock->sk; 1201 struct socket_wq *wq; 1202 1203 if (sk == NULL) 1204 return -EINVAL; 1205 1206 lock_sock(sk); 1207 wq = rcu_dereference_protected(sock->wq, sock_owned_by_user(sk)); 1208 fasync_helper(fd, filp, on, &wq->fasync_list); 1209 1210 if (!wq->fasync_list) 1211 sock_reset_flag(sk, SOCK_FASYNC); 1212 else 1213 sock_set_flag(sk, SOCK_FASYNC); 1214 1215 release_sock(sk); 1216 return 0; 1217 } 1218 1219 /* This function may be called only under socket lock or callback_lock or rcu_lock */ 1220 1221 int sock_wake_async(struct socket *sock, int how, int band) 1222 { 1223 struct socket_wq *wq; 1224 1225 if (!sock) 1226 return -1; 1227 rcu_read_lock(); 1228 wq = rcu_dereference(sock->wq); 1229 if (!wq || !wq->fasync_list) { 1230 rcu_read_unlock(); 1231 return -1; 1232 } 1233 switch (how) { 1234 case SOCK_WAKE_WAITD: 1235 if (test_bit(SOCK_ASYNC_WAITDATA, &sock->flags)) 1236 break; 1237 goto call_kill; 1238 case SOCK_WAKE_SPACE: 1239 if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags)) 1240 break; 1241 /* fall through */ 1242 case SOCK_WAKE_IO: 1243 call_kill: 1244 kill_fasync(&wq->fasync_list, SIGIO, band); 1245 break; 1246 case SOCK_WAKE_URG: 1247 kill_fasync(&wq->fasync_list, SIGURG, band); 1248 } 1249 rcu_read_unlock(); 1250 return 0; 1251 } 1252 EXPORT_SYMBOL(sock_wake_async); 1253 1254 int __sock_create(struct net *net, int family, int type, int protocol, 1255 struct socket **res, int kern) 1256 { 1257 int err; 1258 struct socket *sock; 1259 const struct net_proto_family *pf; 1260 1261 /* 1262 * Check protocol is in range 1263 */ 1264 if (family < 0 || family >= NPROTO) 1265 return -EAFNOSUPPORT; 1266 if (type < 0 || type >= SOCK_MAX) 1267 return -EINVAL; 1268 1269 /* Compatibility. 1270 1271 This uglymoron is moved from INET layer to here to avoid 1272 deadlock in module load. 1273 */ 1274 if (family == PF_INET && type == SOCK_PACKET) { 1275 static int warned; 1276 if (!warned) { 1277 warned = 1; 1278 pr_info("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1279 current->comm); 1280 } 1281 family = PF_PACKET; 1282 } 1283 1284 err = security_socket_create(family, type, protocol, kern); 1285 if (err) 1286 return err; 1287 1288 /* 1289 * Allocate the socket and allow the family to set things up. if 1290 * the protocol is 0, the family is instructed to select an appropriate 1291 * default. 1292 */ 1293 sock = sock_alloc(); 1294 if (!sock) { 1295 net_warn_ratelimited("socket: no more sockets\n"); 1296 return -ENFILE; /* Not exactly a match, but its the 1297 closest posix thing */ 1298 } 1299 1300 sock->type = type; 1301 1302 #ifdef CONFIG_MODULES 1303 /* Attempt to load a protocol module if the find failed. 1304 * 1305 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1306 * requested real, full-featured networking support upon configuration. 1307 * Otherwise module support will break! 1308 */ 1309 if (rcu_access_pointer(net_families[family]) == NULL) 1310 request_module("net-pf-%d", family); 1311 #endif 1312 1313 rcu_read_lock(); 1314 pf = rcu_dereference(net_families[family]); 1315 err = -EAFNOSUPPORT; 1316 if (!pf) 1317 goto out_release; 1318 1319 /* 1320 * We will call the ->create function, that possibly is in a loadable 1321 * module, so we have to bump that loadable module refcnt first. 1322 */ 1323 if (!try_module_get(pf->owner)) 1324 goto out_release; 1325 1326 /* Now protected by module ref count */ 1327 rcu_read_unlock(); 1328 1329 err = pf->create(net, sock, protocol, kern); 1330 if (err < 0) 1331 goto out_module_put; 1332 1333 /* 1334 * Now to bump the refcnt of the [loadable] module that owns this 1335 * socket at sock_release time we decrement its refcnt. 1336 */ 1337 if (!try_module_get(sock->ops->owner)) 1338 goto out_module_busy; 1339 1340 /* 1341 * Now that we're done with the ->create function, the [loadable] 1342 * module can have its refcnt decremented 1343 */ 1344 module_put(pf->owner); 1345 err = security_socket_post_create(sock, family, type, protocol, kern); 1346 if (err) 1347 goto out_sock_release; 1348 *res = sock; 1349 1350 return 0; 1351 1352 out_module_busy: 1353 err = -EAFNOSUPPORT; 1354 out_module_put: 1355 sock->ops = NULL; 1356 module_put(pf->owner); 1357 out_sock_release: 1358 sock_release(sock); 1359 return err; 1360 1361 out_release: 1362 rcu_read_unlock(); 1363 goto out_sock_release; 1364 } 1365 EXPORT_SYMBOL(__sock_create); 1366 1367 int sock_create(int family, int type, int protocol, struct socket **res) 1368 { 1369 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1370 } 1371 EXPORT_SYMBOL(sock_create); 1372 1373 int sock_create_kern(int family, int type, int protocol, struct socket **res) 1374 { 1375 return __sock_create(&init_net, family, type, protocol, res, 1); 1376 } 1377 EXPORT_SYMBOL(sock_create_kern); 1378 1379 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1380 { 1381 int retval; 1382 struct socket *sock; 1383 int flags; 1384 1385 /* Check the SOCK_* constants for consistency. */ 1386 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1387 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1388 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1389 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1390 1391 flags = type & ~SOCK_TYPE_MASK; 1392 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1393 return -EINVAL; 1394 type &= SOCK_TYPE_MASK; 1395 1396 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1397 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1398 1399 retval = sock_create(family, type, protocol, &sock); 1400 if (retval < 0) 1401 goto out; 1402 1403 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1404 if (retval < 0) 1405 goto out_release; 1406 1407 out: 1408 /* It may be already another descriptor 8) Not kernel problem. */ 1409 return retval; 1410 1411 out_release: 1412 sock_release(sock); 1413 return retval; 1414 } 1415 1416 /* 1417 * Create a pair of connected sockets. 1418 */ 1419 1420 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1421 int __user *, usockvec) 1422 { 1423 struct socket *sock1, *sock2; 1424 int fd1, fd2, err; 1425 struct file *newfile1, *newfile2; 1426 int flags; 1427 1428 flags = type & ~SOCK_TYPE_MASK; 1429 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1430 return -EINVAL; 1431 type &= SOCK_TYPE_MASK; 1432 1433 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1434 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1435 1436 /* 1437 * Obtain the first socket and check if the underlying protocol 1438 * supports the socketpair call. 1439 */ 1440 1441 err = sock_create(family, type, protocol, &sock1); 1442 if (err < 0) 1443 goto out; 1444 1445 err = sock_create(family, type, protocol, &sock2); 1446 if (err < 0) 1447 goto out_release_1; 1448 1449 err = sock1->ops->socketpair(sock1, sock2); 1450 if (err < 0) 1451 goto out_release_both; 1452 1453 fd1 = get_unused_fd_flags(flags); 1454 if (unlikely(fd1 < 0)) { 1455 err = fd1; 1456 goto out_release_both; 1457 } 1458 1459 fd2 = get_unused_fd_flags(flags); 1460 if (unlikely(fd2 < 0)) { 1461 err = fd2; 1462 goto out_put_unused_1; 1463 } 1464 1465 newfile1 = sock_alloc_file(sock1, flags, NULL); 1466 if (unlikely(IS_ERR(newfile1))) { 1467 err = PTR_ERR(newfile1); 1468 goto out_put_unused_both; 1469 } 1470 1471 newfile2 = sock_alloc_file(sock2, flags, NULL); 1472 if (IS_ERR(newfile2)) { 1473 err = PTR_ERR(newfile2); 1474 goto out_fput_1; 1475 } 1476 1477 err = put_user(fd1, &usockvec[0]); 1478 if (err) 1479 goto out_fput_both; 1480 1481 err = put_user(fd2, &usockvec[1]); 1482 if (err) 1483 goto out_fput_both; 1484 1485 audit_fd_pair(fd1, fd2); 1486 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 return 0; 1494 1495 out_fput_both: 1496 fput(newfile2); 1497 fput(newfile1); 1498 put_unused_fd(fd2); 1499 put_unused_fd(fd1); 1500 goto out; 1501 1502 out_fput_1: 1503 fput(newfile1); 1504 put_unused_fd(fd2); 1505 put_unused_fd(fd1); 1506 sock_release(sock2); 1507 goto out; 1508 1509 out_put_unused_both: 1510 put_unused_fd(fd2); 1511 out_put_unused_1: 1512 put_unused_fd(fd1); 1513 out_release_both: 1514 sock_release(sock2); 1515 out_release_1: 1516 sock_release(sock1); 1517 out: 1518 return err; 1519 } 1520 1521 /* 1522 * Bind a name to a socket. Nothing much to do here since it's 1523 * the protocol's responsibility to handle the local address. 1524 * 1525 * We move the socket address to kernel space before we call 1526 * the protocol layer (having also checked the address is ok). 1527 */ 1528 1529 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1530 { 1531 struct socket *sock; 1532 struct sockaddr_storage address; 1533 int err, fput_needed; 1534 1535 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1536 if (sock) { 1537 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1538 if (err >= 0) { 1539 err = security_socket_bind(sock, 1540 (struct sockaddr *)&address, 1541 addrlen); 1542 if (!err) 1543 err = sock->ops->bind(sock, 1544 (struct sockaddr *) 1545 &address, addrlen); 1546 } 1547 fput_light(sock->file, fput_needed); 1548 } 1549 return err; 1550 } 1551 1552 /* 1553 * Perform a listen. Basically, we allow the protocol to do anything 1554 * necessary for a listen, and if that works, we mark the socket as 1555 * ready for listening. 1556 */ 1557 1558 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1559 { 1560 struct socket *sock; 1561 int err, fput_needed; 1562 int somaxconn; 1563 1564 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1565 if (sock) { 1566 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1567 if ((unsigned int)backlog > somaxconn) 1568 backlog = somaxconn; 1569 1570 err = security_socket_listen(sock, backlog); 1571 if (!err) 1572 err = sock->ops->listen(sock, backlog); 1573 1574 fput_light(sock->file, fput_needed); 1575 } 1576 return err; 1577 } 1578 1579 /* 1580 * For accept, we attempt to create a new socket, set up the link 1581 * with the client, wake up the client, then return the new 1582 * connected fd. We collect the address of the connector in kernel 1583 * space and move it to user at the very end. This is unclean because 1584 * we open the socket then return an error. 1585 * 1586 * 1003.1g adds the ability to recvmsg() to query connection pending 1587 * status to recvmsg. We need to add that support in a way thats 1588 * clean when we restucture accept also. 1589 */ 1590 1591 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1592 int __user *, upeer_addrlen, int, flags) 1593 { 1594 struct socket *sock, *newsock; 1595 struct file *newfile; 1596 int err, len, newfd, fput_needed; 1597 struct sockaddr_storage address; 1598 1599 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1600 return -EINVAL; 1601 1602 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1603 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1604 1605 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1606 if (!sock) 1607 goto out; 1608 1609 err = -ENFILE; 1610 newsock = sock_alloc(); 1611 if (!newsock) 1612 goto out_put; 1613 1614 newsock->type = sock->type; 1615 newsock->ops = sock->ops; 1616 1617 /* 1618 * We don't need try_module_get here, as the listening socket (sock) 1619 * has the protocol module (sock->ops->owner) held. 1620 */ 1621 __module_get(newsock->ops->owner); 1622 1623 newfd = get_unused_fd_flags(flags); 1624 if (unlikely(newfd < 0)) { 1625 err = newfd; 1626 sock_release(newsock); 1627 goto out_put; 1628 } 1629 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1630 if (unlikely(IS_ERR(newfile))) { 1631 err = PTR_ERR(newfile); 1632 put_unused_fd(newfd); 1633 sock_release(newsock); 1634 goto out_put; 1635 } 1636 1637 err = security_socket_accept(sock, newsock); 1638 if (err) 1639 goto out_fd; 1640 1641 err = sock->ops->accept(sock, newsock, sock->file->f_flags); 1642 if (err < 0) 1643 goto out_fd; 1644 1645 if (upeer_sockaddr) { 1646 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1647 &len, 2) < 0) { 1648 err = -ECONNABORTED; 1649 goto out_fd; 1650 } 1651 err = move_addr_to_user(&address, 1652 len, upeer_sockaddr, upeer_addrlen); 1653 if (err < 0) 1654 goto out_fd; 1655 } 1656 1657 /* File flags are not inherited via accept() unlike another OSes. */ 1658 1659 fd_install(newfd, newfile); 1660 err = newfd; 1661 1662 out_put: 1663 fput_light(sock->file, fput_needed); 1664 out: 1665 return err; 1666 out_fd: 1667 fput(newfile); 1668 put_unused_fd(newfd); 1669 goto out_put; 1670 } 1671 1672 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1673 int __user *, upeer_addrlen) 1674 { 1675 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1676 } 1677 1678 /* 1679 * Attempt to connect to a socket with the server address. The address 1680 * is in user space so we verify it is OK and move it to kernel space. 1681 * 1682 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1683 * break bindings 1684 * 1685 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1686 * other SEQPACKET protocols that take time to connect() as it doesn't 1687 * include the -EINPROGRESS status for such sockets. 1688 */ 1689 1690 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1691 int, addrlen) 1692 { 1693 struct socket *sock; 1694 struct sockaddr_storage address; 1695 int err, fput_needed; 1696 1697 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1698 if (!sock) 1699 goto out; 1700 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1701 if (err < 0) 1702 goto out_put; 1703 1704 err = 1705 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1706 if (err) 1707 goto out_put; 1708 1709 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1710 sock->file->f_flags); 1711 out_put: 1712 fput_light(sock->file, fput_needed); 1713 out: 1714 return err; 1715 } 1716 1717 /* 1718 * Get the local address ('name') of a socket object. Move the obtained 1719 * name to user space. 1720 */ 1721 1722 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1723 int __user *, usockaddr_len) 1724 { 1725 struct socket *sock; 1726 struct sockaddr_storage address; 1727 int len, err, fput_needed; 1728 1729 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1730 if (!sock) 1731 goto out; 1732 1733 err = security_socket_getsockname(sock); 1734 if (err) 1735 goto out_put; 1736 1737 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1738 if (err) 1739 goto out_put; 1740 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 1741 1742 out_put: 1743 fput_light(sock->file, fput_needed); 1744 out: 1745 return err; 1746 } 1747 1748 /* 1749 * Get the remote address ('name') of a socket object. Move the obtained 1750 * name to user space. 1751 */ 1752 1753 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1754 int __user *, usockaddr_len) 1755 { 1756 struct socket *sock; 1757 struct sockaddr_storage address; 1758 int len, err, fput_needed; 1759 1760 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1761 if (sock != NULL) { 1762 err = security_socket_getpeername(sock); 1763 if (err) { 1764 fput_light(sock->file, fput_needed); 1765 return err; 1766 } 1767 1768 err = 1769 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1770 1); 1771 if (!err) 1772 err = move_addr_to_user(&address, len, usockaddr, 1773 usockaddr_len); 1774 fput_light(sock->file, fput_needed); 1775 } 1776 return err; 1777 } 1778 1779 /* 1780 * Send a datagram to a given address. We move the address into kernel 1781 * space and check the user space data area is readable before invoking 1782 * the protocol. 1783 */ 1784 1785 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1786 unsigned int, flags, struct sockaddr __user *, addr, 1787 int, addr_len) 1788 { 1789 struct socket *sock; 1790 struct sockaddr_storage address; 1791 int err; 1792 struct msghdr msg; 1793 struct iovec iov; 1794 int fput_needed; 1795 1796 if (len > INT_MAX) 1797 len = INT_MAX; 1798 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1799 if (!sock) 1800 goto out; 1801 1802 iov.iov_base = buff; 1803 iov.iov_len = len; 1804 msg.msg_name = NULL; 1805 msg.msg_iov = &iov; 1806 msg.msg_iovlen = 1; 1807 msg.msg_control = NULL; 1808 msg.msg_controllen = 0; 1809 msg.msg_namelen = 0; 1810 if (addr) { 1811 err = move_addr_to_kernel(addr, addr_len, &address); 1812 if (err < 0) 1813 goto out_put; 1814 msg.msg_name = (struct sockaddr *)&address; 1815 msg.msg_namelen = addr_len; 1816 } 1817 if (sock->file->f_flags & O_NONBLOCK) 1818 flags |= MSG_DONTWAIT; 1819 msg.msg_flags = flags; 1820 err = sock_sendmsg(sock, &msg, len); 1821 1822 out_put: 1823 fput_light(sock->file, fput_needed); 1824 out: 1825 return err; 1826 } 1827 1828 /* 1829 * Send a datagram down a socket. 1830 */ 1831 1832 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1833 unsigned int, flags) 1834 { 1835 return sys_sendto(fd, buff, len, flags, NULL, 0); 1836 } 1837 1838 /* 1839 * Receive a frame from the socket and optionally record the address of the 1840 * sender. We verify the buffers are writable and if needed move the 1841 * sender address from kernel to user space. 1842 */ 1843 1844 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1845 unsigned int, flags, struct sockaddr __user *, addr, 1846 int __user *, addr_len) 1847 { 1848 struct socket *sock; 1849 struct iovec iov; 1850 struct msghdr msg; 1851 struct sockaddr_storage address; 1852 int err, err2; 1853 int fput_needed; 1854 1855 if (size > INT_MAX) 1856 size = INT_MAX; 1857 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1858 if (!sock) 1859 goto out; 1860 1861 msg.msg_control = NULL; 1862 msg.msg_controllen = 0; 1863 msg.msg_iovlen = 1; 1864 msg.msg_iov = &iov; 1865 iov.iov_len = size; 1866 iov.iov_base = ubuf; 1867 /* Save some cycles and don't copy the address if not needed */ 1868 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1869 /* We assume all kernel code knows the size of sockaddr_storage */ 1870 msg.msg_namelen = 0; 1871 if (sock->file->f_flags & O_NONBLOCK) 1872 flags |= MSG_DONTWAIT; 1873 err = sock_recvmsg(sock, &msg, size, flags); 1874 1875 if (err >= 0 && addr != NULL) { 1876 err2 = move_addr_to_user(&address, 1877 msg.msg_namelen, addr, addr_len); 1878 if (err2 < 0) 1879 err = err2; 1880 } 1881 1882 fput_light(sock->file, fput_needed); 1883 out: 1884 return err; 1885 } 1886 1887 /* 1888 * Receive a datagram from a socket. 1889 */ 1890 1891 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1892 unsigned int, flags) 1893 { 1894 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1895 } 1896 1897 /* 1898 * Set a socket option. Because we don't know the option lengths we have 1899 * to pass the user mode parameter for the protocols to sort out. 1900 */ 1901 1902 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1903 char __user *, optval, int, optlen) 1904 { 1905 int err, fput_needed; 1906 struct socket *sock; 1907 1908 if (optlen < 0) 1909 return -EINVAL; 1910 1911 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1912 if (sock != NULL) { 1913 err = security_socket_setsockopt(sock, level, optname); 1914 if (err) 1915 goto out_put; 1916 1917 if (level == SOL_SOCKET) 1918 err = 1919 sock_setsockopt(sock, level, optname, optval, 1920 optlen); 1921 else 1922 err = 1923 sock->ops->setsockopt(sock, level, optname, optval, 1924 optlen); 1925 out_put: 1926 fput_light(sock->file, fput_needed); 1927 } 1928 return err; 1929 } 1930 1931 /* 1932 * Get a socket option. Because we don't know the option lengths we have 1933 * to pass a user mode parameter for the protocols to sort out. 1934 */ 1935 1936 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1937 char __user *, optval, int __user *, optlen) 1938 { 1939 int err, fput_needed; 1940 struct socket *sock; 1941 1942 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1943 if (sock != NULL) { 1944 err = security_socket_getsockopt(sock, level, optname); 1945 if (err) 1946 goto out_put; 1947 1948 if (level == SOL_SOCKET) 1949 err = 1950 sock_getsockopt(sock, level, optname, optval, 1951 optlen); 1952 else 1953 err = 1954 sock->ops->getsockopt(sock, level, optname, optval, 1955 optlen); 1956 out_put: 1957 fput_light(sock->file, fput_needed); 1958 } 1959 return err; 1960 } 1961 1962 /* 1963 * Shutdown a socket. 1964 */ 1965 1966 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1967 { 1968 int err, fput_needed; 1969 struct socket *sock; 1970 1971 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1972 if (sock != NULL) { 1973 err = security_socket_shutdown(sock, how); 1974 if (!err) 1975 err = sock->ops->shutdown(sock, how); 1976 fput_light(sock->file, fput_needed); 1977 } 1978 return err; 1979 } 1980 1981 /* A couple of helpful macros for getting the address of the 32/64 bit 1982 * fields which are the same type (int / unsigned) on our platforms. 1983 */ 1984 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1985 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1986 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1987 1988 struct used_address { 1989 struct sockaddr_storage name; 1990 unsigned int name_len; 1991 }; 1992 1993 static int copy_msghdr_from_user(struct msghdr *kmsg, 1994 struct msghdr __user *umsg) 1995 { 1996 if (copy_from_user(kmsg, umsg, sizeof(struct msghdr))) 1997 return -EFAULT; 1998 1999 if (kmsg->msg_name == NULL) 2000 kmsg->msg_namelen = 0; 2001 2002 if (kmsg->msg_namelen < 0) 2003 return -EINVAL; 2004 2005 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 2006 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 2007 return 0; 2008 } 2009 2010 static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg, 2011 struct msghdr *msg_sys, unsigned int flags, 2012 struct used_address *used_address) 2013 { 2014 struct compat_msghdr __user *msg_compat = 2015 (struct compat_msghdr __user *)msg; 2016 struct sockaddr_storage address; 2017 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2018 unsigned char ctl[sizeof(struct cmsghdr) + 20] 2019 __attribute__ ((aligned(sizeof(__kernel_size_t)))); 2020 /* 20 is size of ipv6_pktinfo */ 2021 unsigned char *ctl_buf = ctl; 2022 int err, ctl_len, total_len; 2023 2024 err = -EFAULT; 2025 if (MSG_CMSG_COMPAT & flags) { 2026 if (get_compat_msghdr(msg_sys, msg_compat)) 2027 return -EFAULT; 2028 } else { 2029 err = copy_msghdr_from_user(msg_sys, msg); 2030 if (err) 2031 return err; 2032 } 2033 2034 if (msg_sys->msg_iovlen > UIO_FASTIOV) { 2035 err = -EMSGSIZE; 2036 if (msg_sys->msg_iovlen > UIO_MAXIOV) 2037 goto out; 2038 err = -ENOMEM; 2039 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), 2040 GFP_KERNEL); 2041 if (!iov) 2042 goto out; 2043 } 2044 2045 /* This will also move the address data into kernel space */ 2046 if (MSG_CMSG_COMPAT & flags) { 2047 err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ); 2048 } else 2049 err = verify_iovec(msg_sys, iov, &address, VERIFY_READ); 2050 if (err < 0) 2051 goto out_freeiov; 2052 total_len = err; 2053 2054 err = -ENOBUFS; 2055 2056 if (msg_sys->msg_controllen > INT_MAX) 2057 goto out_freeiov; 2058 ctl_len = msg_sys->msg_controllen; 2059 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2060 err = 2061 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2062 sizeof(ctl)); 2063 if (err) 2064 goto out_freeiov; 2065 ctl_buf = msg_sys->msg_control; 2066 ctl_len = msg_sys->msg_controllen; 2067 } else if (ctl_len) { 2068 if (ctl_len > sizeof(ctl)) { 2069 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2070 if (ctl_buf == NULL) 2071 goto out_freeiov; 2072 } 2073 err = -EFAULT; 2074 /* 2075 * Careful! Before this, msg_sys->msg_control contains a user pointer. 2076 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 2077 * checking falls down on this. 2078 */ 2079 if (copy_from_user(ctl_buf, 2080 (void __user __force *)msg_sys->msg_control, 2081 ctl_len)) 2082 goto out_freectl; 2083 msg_sys->msg_control = ctl_buf; 2084 } 2085 msg_sys->msg_flags = flags; 2086 2087 if (sock->file->f_flags & O_NONBLOCK) 2088 msg_sys->msg_flags |= MSG_DONTWAIT; 2089 /* 2090 * If this is sendmmsg() and current destination address is same as 2091 * previously succeeded address, omit asking LSM's decision. 2092 * used_address->name_len is initialized to UINT_MAX so that the first 2093 * destination address never matches. 2094 */ 2095 if (used_address && msg_sys->msg_name && 2096 used_address->name_len == msg_sys->msg_namelen && 2097 !memcmp(&used_address->name, msg_sys->msg_name, 2098 used_address->name_len)) { 2099 err = sock_sendmsg_nosec(sock, msg_sys, total_len); 2100 goto out_freectl; 2101 } 2102 err = sock_sendmsg(sock, msg_sys, total_len); 2103 /* 2104 * If this is sendmmsg() and sending to current destination address was 2105 * successful, remember it. 2106 */ 2107 if (used_address && err >= 0) { 2108 used_address->name_len = msg_sys->msg_namelen; 2109 if (msg_sys->msg_name) 2110 memcpy(&used_address->name, msg_sys->msg_name, 2111 used_address->name_len); 2112 } 2113 2114 out_freectl: 2115 if (ctl_buf != ctl) 2116 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2117 out_freeiov: 2118 if (iov != iovstack) 2119 kfree(iov); 2120 out: 2121 return err; 2122 } 2123 2124 /* 2125 * BSD sendmsg interface 2126 */ 2127 2128 long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags) 2129 { 2130 int fput_needed, err; 2131 struct msghdr msg_sys; 2132 struct socket *sock; 2133 2134 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2135 if (!sock) 2136 goto out; 2137 2138 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL); 2139 2140 fput_light(sock->file, fput_needed); 2141 out: 2142 return err; 2143 } 2144 2145 SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags) 2146 { 2147 if (flags & MSG_CMSG_COMPAT) 2148 return -EINVAL; 2149 return __sys_sendmsg(fd, msg, flags); 2150 } 2151 2152 /* 2153 * Linux sendmmsg interface 2154 */ 2155 2156 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2157 unsigned int flags) 2158 { 2159 int fput_needed, err, datagrams; 2160 struct socket *sock; 2161 struct mmsghdr __user *entry; 2162 struct compat_mmsghdr __user *compat_entry; 2163 struct msghdr msg_sys; 2164 struct used_address used_address; 2165 2166 if (vlen > UIO_MAXIOV) 2167 vlen = UIO_MAXIOV; 2168 2169 datagrams = 0; 2170 2171 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2172 if (!sock) 2173 return err; 2174 2175 used_address.name_len = UINT_MAX; 2176 entry = mmsg; 2177 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2178 err = 0; 2179 2180 while (datagrams < vlen) { 2181 if (MSG_CMSG_COMPAT & flags) { 2182 err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry, 2183 &msg_sys, flags, &used_address); 2184 if (err < 0) 2185 break; 2186 err = __put_user(err, &compat_entry->msg_len); 2187 ++compat_entry; 2188 } else { 2189 err = ___sys_sendmsg(sock, 2190 (struct msghdr __user *)entry, 2191 &msg_sys, flags, &used_address); 2192 if (err < 0) 2193 break; 2194 err = put_user(err, &entry->msg_len); 2195 ++entry; 2196 } 2197 2198 if (err) 2199 break; 2200 ++datagrams; 2201 } 2202 2203 fput_light(sock->file, fput_needed); 2204 2205 /* We only return an error if no datagrams were able to be sent */ 2206 if (datagrams != 0) 2207 return datagrams; 2208 2209 return err; 2210 } 2211 2212 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2213 unsigned int, vlen, unsigned int, flags) 2214 { 2215 if (flags & MSG_CMSG_COMPAT) 2216 return -EINVAL; 2217 return __sys_sendmmsg(fd, mmsg, vlen, flags); 2218 } 2219 2220 static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg, 2221 struct msghdr *msg_sys, unsigned int flags, int nosec) 2222 { 2223 struct compat_msghdr __user *msg_compat = 2224 (struct compat_msghdr __user *)msg; 2225 struct iovec iovstack[UIO_FASTIOV]; 2226 struct iovec *iov = iovstack; 2227 unsigned long cmsg_ptr; 2228 int err, total_len, len; 2229 2230 /* kernel mode address */ 2231 struct sockaddr_storage addr; 2232 2233 /* user mode address pointers */ 2234 struct sockaddr __user *uaddr; 2235 int __user *uaddr_len; 2236 2237 if (MSG_CMSG_COMPAT & flags) { 2238 if (get_compat_msghdr(msg_sys, msg_compat)) 2239 return -EFAULT; 2240 } else { 2241 err = copy_msghdr_from_user(msg_sys, msg); 2242 if (err) 2243 return err; 2244 } 2245 2246 if (msg_sys->msg_iovlen > UIO_FASTIOV) { 2247 err = -EMSGSIZE; 2248 if (msg_sys->msg_iovlen > UIO_MAXIOV) 2249 goto out; 2250 err = -ENOMEM; 2251 iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec), 2252 GFP_KERNEL); 2253 if (!iov) 2254 goto out; 2255 } 2256 2257 /* Save the user-mode address (verify_iovec will change the 2258 * kernel msghdr to use the kernel address space) 2259 */ 2260 uaddr = (__force void __user *)msg_sys->msg_name; 2261 uaddr_len = COMPAT_NAMELEN(msg); 2262 if (MSG_CMSG_COMPAT & flags) 2263 err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE); 2264 else 2265 err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE); 2266 if (err < 0) 2267 goto out_freeiov; 2268 total_len = err; 2269 2270 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2271 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2272 2273 /* We assume all kernel code knows the size of sockaddr_storage */ 2274 msg_sys->msg_namelen = 0; 2275 2276 if (sock->file->f_flags & O_NONBLOCK) 2277 flags |= MSG_DONTWAIT; 2278 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, 2279 total_len, flags); 2280 if (err < 0) 2281 goto out_freeiov; 2282 len = err; 2283 2284 if (uaddr != NULL) { 2285 err = move_addr_to_user(&addr, 2286 msg_sys->msg_namelen, uaddr, 2287 uaddr_len); 2288 if (err < 0) 2289 goto out_freeiov; 2290 } 2291 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2292 COMPAT_FLAGS(msg)); 2293 if (err) 2294 goto out_freeiov; 2295 if (MSG_CMSG_COMPAT & flags) 2296 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2297 &msg_compat->msg_controllen); 2298 else 2299 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2300 &msg->msg_controllen); 2301 if (err) 2302 goto out_freeiov; 2303 err = len; 2304 2305 out_freeiov: 2306 if (iov != iovstack) 2307 kfree(iov); 2308 out: 2309 return err; 2310 } 2311 2312 /* 2313 * BSD recvmsg interface 2314 */ 2315 2316 long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags) 2317 { 2318 int fput_needed, err; 2319 struct msghdr msg_sys; 2320 struct socket *sock; 2321 2322 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2323 if (!sock) 2324 goto out; 2325 2326 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2327 2328 fput_light(sock->file, fput_needed); 2329 out: 2330 return err; 2331 } 2332 2333 SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, 2334 unsigned int, flags) 2335 { 2336 if (flags & MSG_CMSG_COMPAT) 2337 return -EINVAL; 2338 return __sys_recvmsg(fd, msg, flags); 2339 } 2340 2341 /* 2342 * Linux recvmmsg interface 2343 */ 2344 2345 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2346 unsigned int flags, struct timespec *timeout) 2347 { 2348 int fput_needed, err, datagrams; 2349 struct socket *sock; 2350 struct mmsghdr __user *entry; 2351 struct compat_mmsghdr __user *compat_entry; 2352 struct msghdr msg_sys; 2353 struct timespec end_time; 2354 2355 if (timeout && 2356 poll_select_set_timeout(&end_time, timeout->tv_sec, 2357 timeout->tv_nsec)) 2358 return -EINVAL; 2359 2360 datagrams = 0; 2361 2362 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2363 if (!sock) 2364 return err; 2365 2366 err = sock_error(sock->sk); 2367 if (err) 2368 goto out_put; 2369 2370 entry = mmsg; 2371 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2372 2373 while (datagrams < vlen) { 2374 /* 2375 * No need to ask LSM for more than the first datagram. 2376 */ 2377 if (MSG_CMSG_COMPAT & flags) { 2378 err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry, 2379 &msg_sys, flags & ~MSG_WAITFORONE, 2380 datagrams); 2381 if (err < 0) 2382 break; 2383 err = __put_user(err, &compat_entry->msg_len); 2384 ++compat_entry; 2385 } else { 2386 err = ___sys_recvmsg(sock, 2387 (struct msghdr __user *)entry, 2388 &msg_sys, flags & ~MSG_WAITFORONE, 2389 datagrams); 2390 if (err < 0) 2391 break; 2392 err = put_user(err, &entry->msg_len); 2393 ++entry; 2394 } 2395 2396 if (err) 2397 break; 2398 ++datagrams; 2399 2400 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2401 if (flags & MSG_WAITFORONE) 2402 flags |= MSG_DONTWAIT; 2403 2404 if (timeout) { 2405 ktime_get_ts(timeout); 2406 *timeout = timespec_sub(end_time, *timeout); 2407 if (timeout->tv_sec < 0) { 2408 timeout->tv_sec = timeout->tv_nsec = 0; 2409 break; 2410 } 2411 2412 /* Timeout, return less than vlen datagrams */ 2413 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2414 break; 2415 } 2416 2417 /* Out of band data, return right away */ 2418 if (msg_sys.msg_flags & MSG_OOB) 2419 break; 2420 } 2421 2422 out_put: 2423 fput_light(sock->file, fput_needed); 2424 2425 if (err == 0) 2426 return datagrams; 2427 2428 if (datagrams != 0) { 2429 /* 2430 * We may return less entries than requested (vlen) if the 2431 * sock is non block and there aren't enough datagrams... 2432 */ 2433 if (err != -EAGAIN) { 2434 /* 2435 * ... or if recvmsg returns an error after we 2436 * received some datagrams, where we record the 2437 * error to return on the next call or if the 2438 * app asks about it using getsockopt(SO_ERROR). 2439 */ 2440 sock->sk->sk_err = -err; 2441 } 2442 2443 return datagrams; 2444 } 2445 2446 return err; 2447 } 2448 2449 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2450 unsigned int, vlen, unsigned int, flags, 2451 struct timespec __user *, timeout) 2452 { 2453 int datagrams; 2454 struct timespec timeout_sys; 2455 2456 if (flags & MSG_CMSG_COMPAT) 2457 return -EINVAL; 2458 2459 if (!timeout) 2460 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2461 2462 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2463 return -EFAULT; 2464 2465 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2466 2467 if (datagrams > 0 && 2468 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2469 datagrams = -EFAULT; 2470 2471 return datagrams; 2472 } 2473 2474 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2475 /* Argument list sizes for sys_socketcall */ 2476 #define AL(x) ((x) * sizeof(unsigned long)) 2477 static const unsigned char nargs[21] = { 2478 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2479 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2480 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2481 AL(4), AL(5), AL(4) 2482 }; 2483 2484 #undef AL 2485 2486 /* 2487 * System call vectors. 2488 * 2489 * Argument checking cleaned up. Saved 20% in size. 2490 * This function doesn't need to set the kernel lock because 2491 * it is set by the callees. 2492 */ 2493 2494 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2495 { 2496 unsigned long a[AUDITSC_ARGS]; 2497 unsigned long a0, a1; 2498 int err; 2499 unsigned int len; 2500 2501 if (call < 1 || call > SYS_SENDMMSG) 2502 return -EINVAL; 2503 2504 len = nargs[call]; 2505 if (len > sizeof(a)) 2506 return -EINVAL; 2507 2508 /* copy_from_user should be SMP safe. */ 2509 if (copy_from_user(a, args, len)) 2510 return -EFAULT; 2511 2512 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2513 if (err) 2514 return err; 2515 2516 a0 = a[0]; 2517 a1 = a[1]; 2518 2519 switch (call) { 2520 case SYS_SOCKET: 2521 err = sys_socket(a0, a1, a[2]); 2522 break; 2523 case SYS_BIND: 2524 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2525 break; 2526 case SYS_CONNECT: 2527 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2528 break; 2529 case SYS_LISTEN: 2530 err = sys_listen(a0, a1); 2531 break; 2532 case SYS_ACCEPT: 2533 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2534 (int __user *)a[2], 0); 2535 break; 2536 case SYS_GETSOCKNAME: 2537 err = 2538 sys_getsockname(a0, (struct sockaddr __user *)a1, 2539 (int __user *)a[2]); 2540 break; 2541 case SYS_GETPEERNAME: 2542 err = 2543 sys_getpeername(a0, (struct sockaddr __user *)a1, 2544 (int __user *)a[2]); 2545 break; 2546 case SYS_SOCKETPAIR: 2547 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2548 break; 2549 case SYS_SEND: 2550 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2551 break; 2552 case SYS_SENDTO: 2553 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2554 (struct sockaddr __user *)a[4], a[5]); 2555 break; 2556 case SYS_RECV: 2557 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2558 break; 2559 case SYS_RECVFROM: 2560 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2561 (struct sockaddr __user *)a[4], 2562 (int __user *)a[5]); 2563 break; 2564 case SYS_SHUTDOWN: 2565 err = sys_shutdown(a0, a1); 2566 break; 2567 case SYS_SETSOCKOPT: 2568 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2569 break; 2570 case SYS_GETSOCKOPT: 2571 err = 2572 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2573 (int __user *)a[4]); 2574 break; 2575 case SYS_SENDMSG: 2576 err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); 2577 break; 2578 case SYS_SENDMMSG: 2579 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2580 break; 2581 case SYS_RECVMSG: 2582 err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); 2583 break; 2584 case SYS_RECVMMSG: 2585 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2586 (struct timespec __user *)a[4]); 2587 break; 2588 case SYS_ACCEPT4: 2589 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2590 (int __user *)a[2], a[3]); 2591 break; 2592 default: 2593 err = -EINVAL; 2594 break; 2595 } 2596 return err; 2597 } 2598 2599 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2600 2601 /** 2602 * sock_register - add a socket protocol handler 2603 * @ops: description of protocol 2604 * 2605 * This function is called by a protocol handler that wants to 2606 * advertise its address family, and have it linked into the 2607 * socket interface. The value ops->family corresponds to the 2608 * socket system call protocol family. 2609 */ 2610 int sock_register(const struct net_proto_family *ops) 2611 { 2612 int err; 2613 2614 if (ops->family >= NPROTO) { 2615 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2616 return -ENOBUFS; 2617 } 2618 2619 spin_lock(&net_family_lock); 2620 if (rcu_dereference_protected(net_families[ops->family], 2621 lockdep_is_held(&net_family_lock))) 2622 err = -EEXIST; 2623 else { 2624 rcu_assign_pointer(net_families[ops->family], ops); 2625 err = 0; 2626 } 2627 spin_unlock(&net_family_lock); 2628 2629 pr_info("NET: Registered protocol family %d\n", ops->family); 2630 return err; 2631 } 2632 EXPORT_SYMBOL(sock_register); 2633 2634 /** 2635 * sock_unregister - remove a protocol handler 2636 * @family: protocol family to remove 2637 * 2638 * This function is called by a protocol handler that wants to 2639 * remove its address family, and have it unlinked from the 2640 * new socket creation. 2641 * 2642 * If protocol handler is a module, then it can use module reference 2643 * counts to protect against new references. If protocol handler is not 2644 * a module then it needs to provide its own protection in 2645 * the ops->create routine. 2646 */ 2647 void sock_unregister(int family) 2648 { 2649 BUG_ON(family < 0 || family >= NPROTO); 2650 2651 spin_lock(&net_family_lock); 2652 RCU_INIT_POINTER(net_families[family], NULL); 2653 spin_unlock(&net_family_lock); 2654 2655 synchronize_rcu(); 2656 2657 pr_info("NET: Unregistered protocol family %d\n", family); 2658 } 2659 EXPORT_SYMBOL(sock_unregister); 2660 2661 static int __init sock_init(void) 2662 { 2663 int err; 2664 /* 2665 * Initialize the network sysctl infrastructure. 2666 */ 2667 err = net_sysctl_init(); 2668 if (err) 2669 goto out; 2670 2671 /* 2672 * Initialize skbuff SLAB cache 2673 */ 2674 skb_init(); 2675 2676 /* 2677 * Initialize the protocols module. 2678 */ 2679 2680 init_inodecache(); 2681 2682 err = register_filesystem(&sock_fs_type); 2683 if (err) 2684 goto out_fs; 2685 sock_mnt = kern_mount(&sock_fs_type); 2686 if (IS_ERR(sock_mnt)) { 2687 err = PTR_ERR(sock_mnt); 2688 goto out_mount; 2689 } 2690 2691 /* The real protocol initialization is performed in later initcalls. 2692 */ 2693 2694 #ifdef CONFIG_NETFILTER 2695 err = netfilter_init(); 2696 if (err) 2697 goto out; 2698 #endif 2699 2700 ptp_classifier_init(); 2701 2702 out: 2703 return err; 2704 2705 out_mount: 2706 unregister_filesystem(&sock_fs_type); 2707 out_fs: 2708 goto out; 2709 } 2710 2711 core_initcall(sock_init); /* early initcall */ 2712 2713 #ifdef CONFIG_PROC_FS 2714 void socket_seq_show(struct seq_file *seq) 2715 { 2716 int cpu; 2717 int counter = 0; 2718 2719 for_each_possible_cpu(cpu) 2720 counter += per_cpu(sockets_in_use, cpu); 2721 2722 /* It can be negative, by the way. 8) */ 2723 if (counter < 0) 2724 counter = 0; 2725 2726 seq_printf(seq, "sockets: used %d\n", counter); 2727 } 2728 #endif /* CONFIG_PROC_FS */ 2729 2730 #ifdef CONFIG_COMPAT 2731 static int do_siocgstamp(struct net *net, struct socket *sock, 2732 unsigned int cmd, void __user *up) 2733 { 2734 mm_segment_t old_fs = get_fs(); 2735 struct timeval ktv; 2736 int err; 2737 2738 set_fs(KERNEL_DS); 2739 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2740 set_fs(old_fs); 2741 if (!err) 2742 err = compat_put_timeval(&ktv, up); 2743 2744 return err; 2745 } 2746 2747 static int do_siocgstampns(struct net *net, struct socket *sock, 2748 unsigned int cmd, void __user *up) 2749 { 2750 mm_segment_t old_fs = get_fs(); 2751 struct timespec kts; 2752 int err; 2753 2754 set_fs(KERNEL_DS); 2755 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2756 set_fs(old_fs); 2757 if (!err) 2758 err = compat_put_timespec(&kts, up); 2759 2760 return err; 2761 } 2762 2763 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2764 { 2765 struct ifreq __user *uifr; 2766 int err; 2767 2768 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2769 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2770 return -EFAULT; 2771 2772 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2773 if (err) 2774 return err; 2775 2776 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2777 return -EFAULT; 2778 2779 return 0; 2780 } 2781 2782 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2783 { 2784 struct compat_ifconf ifc32; 2785 struct ifconf ifc; 2786 struct ifconf __user *uifc; 2787 struct compat_ifreq __user *ifr32; 2788 struct ifreq __user *ifr; 2789 unsigned int i, j; 2790 int err; 2791 2792 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2793 return -EFAULT; 2794 2795 memset(&ifc, 0, sizeof(ifc)); 2796 if (ifc32.ifcbuf == 0) { 2797 ifc32.ifc_len = 0; 2798 ifc.ifc_len = 0; 2799 ifc.ifc_req = NULL; 2800 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2801 } else { 2802 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * 2803 sizeof(struct ifreq); 2804 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2805 ifc.ifc_len = len; 2806 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2807 ifr32 = compat_ptr(ifc32.ifcbuf); 2808 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { 2809 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2810 return -EFAULT; 2811 ifr++; 2812 ifr32++; 2813 } 2814 } 2815 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2816 return -EFAULT; 2817 2818 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2819 if (err) 2820 return err; 2821 2822 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2823 return -EFAULT; 2824 2825 ifr = ifc.ifc_req; 2826 ifr32 = compat_ptr(ifc32.ifcbuf); 2827 for (i = 0, j = 0; 2828 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2829 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { 2830 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) 2831 return -EFAULT; 2832 ifr32++; 2833 ifr++; 2834 } 2835 2836 if (ifc32.ifcbuf == 0) { 2837 /* Translate from 64-bit structure multiple to 2838 * a 32-bit one. 2839 */ 2840 i = ifc.ifc_len; 2841 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2842 ifc32.ifc_len = i; 2843 } else { 2844 ifc32.ifc_len = i; 2845 } 2846 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2847 return -EFAULT; 2848 2849 return 0; 2850 } 2851 2852 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2853 { 2854 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2855 bool convert_in = false, convert_out = false; 2856 size_t buf_size = ALIGN(sizeof(struct ifreq), 8); 2857 struct ethtool_rxnfc __user *rxnfc; 2858 struct ifreq __user *ifr; 2859 u32 rule_cnt = 0, actual_rule_cnt; 2860 u32 ethcmd; 2861 u32 data; 2862 int ret; 2863 2864 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2865 return -EFAULT; 2866 2867 compat_rxnfc = compat_ptr(data); 2868 2869 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2870 return -EFAULT; 2871 2872 /* Most ethtool structures are defined without padding. 2873 * Unfortunately struct ethtool_rxnfc is an exception. 2874 */ 2875 switch (ethcmd) { 2876 default: 2877 break; 2878 case ETHTOOL_GRXCLSRLALL: 2879 /* Buffer size is variable */ 2880 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2881 return -EFAULT; 2882 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2883 return -ENOMEM; 2884 buf_size += rule_cnt * sizeof(u32); 2885 /* fall through */ 2886 case ETHTOOL_GRXRINGS: 2887 case ETHTOOL_GRXCLSRLCNT: 2888 case ETHTOOL_GRXCLSRULE: 2889 case ETHTOOL_SRXCLSRLINS: 2890 convert_out = true; 2891 /* fall through */ 2892 case ETHTOOL_SRXCLSRLDEL: 2893 buf_size += sizeof(struct ethtool_rxnfc); 2894 convert_in = true; 2895 break; 2896 } 2897 2898 ifr = compat_alloc_user_space(buf_size); 2899 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); 2900 2901 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2902 return -EFAULT; 2903 2904 if (put_user(convert_in ? rxnfc : compat_ptr(data), 2905 &ifr->ifr_ifru.ifru_data)) 2906 return -EFAULT; 2907 2908 if (convert_in) { 2909 /* We expect there to be holes between fs.m_ext and 2910 * fs.ring_cookie and at the end of fs, but nowhere else. 2911 */ 2912 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2913 sizeof(compat_rxnfc->fs.m_ext) != 2914 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2915 sizeof(rxnfc->fs.m_ext)); 2916 BUILD_BUG_ON( 2917 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2918 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2919 offsetof(struct ethtool_rxnfc, fs.location) - 2920 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2921 2922 if (copy_in_user(rxnfc, compat_rxnfc, 2923 (void __user *)(&rxnfc->fs.m_ext + 1) - 2924 (void __user *)rxnfc) || 2925 copy_in_user(&rxnfc->fs.ring_cookie, 2926 &compat_rxnfc->fs.ring_cookie, 2927 (void __user *)(&rxnfc->fs.location + 1) - 2928 (void __user *)&rxnfc->fs.ring_cookie) || 2929 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2930 sizeof(rxnfc->rule_cnt))) 2931 return -EFAULT; 2932 } 2933 2934 ret = dev_ioctl(net, SIOCETHTOOL, ifr); 2935 if (ret) 2936 return ret; 2937 2938 if (convert_out) { 2939 if (copy_in_user(compat_rxnfc, rxnfc, 2940 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2941 (const void __user *)rxnfc) || 2942 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2943 &rxnfc->fs.ring_cookie, 2944 (const void __user *)(&rxnfc->fs.location + 1) - 2945 (const void __user *)&rxnfc->fs.ring_cookie) || 2946 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2947 sizeof(rxnfc->rule_cnt))) 2948 return -EFAULT; 2949 2950 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2951 /* As an optimisation, we only copy the actual 2952 * number of rules that the underlying 2953 * function returned. Since Mallory might 2954 * change the rule count in user memory, we 2955 * check that it is less than the rule count 2956 * originally given (as the user buffer size), 2957 * which has been range-checked. 2958 */ 2959 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2960 return -EFAULT; 2961 if (actual_rule_cnt < rule_cnt) 2962 rule_cnt = actual_rule_cnt; 2963 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2964 &rxnfc->rule_locs[0], 2965 rule_cnt * sizeof(u32))) 2966 return -EFAULT; 2967 } 2968 } 2969 2970 return 0; 2971 } 2972 2973 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2974 { 2975 void __user *uptr; 2976 compat_uptr_t uptr32; 2977 struct ifreq __user *uifr; 2978 2979 uifr = compat_alloc_user_space(sizeof(*uifr)); 2980 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2981 return -EFAULT; 2982 2983 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2984 return -EFAULT; 2985 2986 uptr = compat_ptr(uptr32); 2987 2988 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2989 return -EFAULT; 2990 2991 return dev_ioctl(net, SIOCWANDEV, uifr); 2992 } 2993 2994 static int bond_ioctl(struct net *net, unsigned int cmd, 2995 struct compat_ifreq __user *ifr32) 2996 { 2997 struct ifreq kifr; 2998 mm_segment_t old_fs; 2999 int err; 3000 3001 switch (cmd) { 3002 case SIOCBONDENSLAVE: 3003 case SIOCBONDRELEASE: 3004 case SIOCBONDSETHWADDR: 3005 case SIOCBONDCHANGEACTIVE: 3006 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 3007 return -EFAULT; 3008 3009 old_fs = get_fs(); 3010 set_fs(KERNEL_DS); 3011 err = dev_ioctl(net, cmd, 3012 (struct ifreq __user __force *) &kifr); 3013 set_fs(old_fs); 3014 3015 return err; 3016 default: 3017 return -ENOIOCTLCMD; 3018 } 3019 } 3020 3021 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 3022 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 3023 struct compat_ifreq __user *u_ifreq32) 3024 { 3025 struct ifreq __user *u_ifreq64; 3026 char tmp_buf[IFNAMSIZ]; 3027 void __user *data64; 3028 u32 data32; 3029 3030 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 3031 IFNAMSIZ)) 3032 return -EFAULT; 3033 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 3034 return -EFAULT; 3035 data64 = compat_ptr(data32); 3036 3037 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 3038 3039 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 3040 IFNAMSIZ)) 3041 return -EFAULT; 3042 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 3043 return -EFAULT; 3044 3045 return dev_ioctl(net, cmd, u_ifreq64); 3046 } 3047 3048 static int dev_ifsioc(struct net *net, struct socket *sock, 3049 unsigned int cmd, struct compat_ifreq __user *uifr32) 3050 { 3051 struct ifreq __user *uifr; 3052 int err; 3053 3054 uifr = compat_alloc_user_space(sizeof(*uifr)); 3055 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 3056 return -EFAULT; 3057 3058 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 3059 3060 if (!err) { 3061 switch (cmd) { 3062 case SIOCGIFFLAGS: 3063 case SIOCGIFMETRIC: 3064 case SIOCGIFMTU: 3065 case SIOCGIFMEM: 3066 case SIOCGIFHWADDR: 3067 case SIOCGIFINDEX: 3068 case SIOCGIFADDR: 3069 case SIOCGIFBRDADDR: 3070 case SIOCGIFDSTADDR: 3071 case SIOCGIFNETMASK: 3072 case SIOCGIFPFLAGS: 3073 case SIOCGIFTXQLEN: 3074 case SIOCGMIIPHY: 3075 case SIOCGMIIREG: 3076 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 3077 err = -EFAULT; 3078 break; 3079 } 3080 } 3081 return err; 3082 } 3083 3084 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 3085 struct compat_ifreq __user *uifr32) 3086 { 3087 struct ifreq ifr; 3088 struct compat_ifmap __user *uifmap32; 3089 mm_segment_t old_fs; 3090 int err; 3091 3092 uifmap32 = &uifr32->ifr_ifru.ifru_map; 3093 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 3094 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3095 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3096 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3097 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 3098 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 3099 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 3100 if (err) 3101 return -EFAULT; 3102 3103 old_fs = get_fs(); 3104 set_fs(KERNEL_DS); 3105 err = dev_ioctl(net, cmd, (void __user __force *)&ifr); 3106 set_fs(old_fs); 3107 3108 if (cmd == SIOCGIFMAP && !err) { 3109 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3110 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3111 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3112 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3113 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3114 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3115 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3116 if (err) 3117 err = -EFAULT; 3118 } 3119 return err; 3120 } 3121 3122 struct rtentry32 { 3123 u32 rt_pad1; 3124 struct sockaddr rt_dst; /* target address */ 3125 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3126 struct sockaddr rt_genmask; /* target network mask (IP) */ 3127 unsigned short rt_flags; 3128 short rt_pad2; 3129 u32 rt_pad3; 3130 unsigned char rt_tos; 3131 unsigned char rt_class; 3132 short rt_pad4; 3133 short rt_metric; /* +1 for binary compatibility! */ 3134 /* char * */ u32 rt_dev; /* forcing the device at add */ 3135 u32 rt_mtu; /* per route MTU/Window */ 3136 u32 rt_window; /* Window clamping */ 3137 unsigned short rt_irtt; /* Initial RTT */ 3138 }; 3139 3140 struct in6_rtmsg32 { 3141 struct in6_addr rtmsg_dst; 3142 struct in6_addr rtmsg_src; 3143 struct in6_addr rtmsg_gateway; 3144 u32 rtmsg_type; 3145 u16 rtmsg_dst_len; 3146 u16 rtmsg_src_len; 3147 u32 rtmsg_metric; 3148 u32 rtmsg_info; 3149 u32 rtmsg_flags; 3150 s32 rtmsg_ifindex; 3151 }; 3152 3153 static int routing_ioctl(struct net *net, struct socket *sock, 3154 unsigned int cmd, void __user *argp) 3155 { 3156 int ret; 3157 void *r = NULL; 3158 struct in6_rtmsg r6; 3159 struct rtentry r4; 3160 char devname[16]; 3161 u32 rtdev; 3162 mm_segment_t old_fs = get_fs(); 3163 3164 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3165 struct in6_rtmsg32 __user *ur6 = argp; 3166 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3167 3 * sizeof(struct in6_addr)); 3168 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3169 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3170 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3171 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3172 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3173 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3174 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3175 3176 r = (void *) &r6; 3177 } else { /* ipv4 */ 3178 struct rtentry32 __user *ur4 = argp; 3179 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3180 3 * sizeof(struct sockaddr)); 3181 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3182 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3183 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3184 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3185 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3186 ret |= get_user(rtdev, &(ur4->rt_dev)); 3187 if (rtdev) { 3188 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3189 r4.rt_dev = (char __user __force *)devname; 3190 devname[15] = 0; 3191 } else 3192 r4.rt_dev = NULL; 3193 3194 r = (void *) &r4; 3195 } 3196 3197 if (ret) { 3198 ret = -EFAULT; 3199 goto out; 3200 } 3201 3202 set_fs(KERNEL_DS); 3203 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3204 set_fs(old_fs); 3205 3206 out: 3207 return ret; 3208 } 3209 3210 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3211 * for some operations; this forces use of the newer bridge-utils that 3212 * use compatible ioctls 3213 */ 3214 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3215 { 3216 compat_ulong_t tmp; 3217 3218 if (get_user(tmp, argp)) 3219 return -EFAULT; 3220 if (tmp == BRCTL_GET_VERSION) 3221 return BRCTL_VERSION + 1; 3222 return -EINVAL; 3223 } 3224 3225 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3226 unsigned int cmd, unsigned long arg) 3227 { 3228 void __user *argp = compat_ptr(arg); 3229 struct sock *sk = sock->sk; 3230 struct net *net = sock_net(sk); 3231 3232 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3233 return compat_ifr_data_ioctl(net, cmd, argp); 3234 3235 switch (cmd) { 3236 case SIOCSIFBR: 3237 case SIOCGIFBR: 3238 return old_bridge_ioctl(argp); 3239 case SIOCGIFNAME: 3240 return dev_ifname32(net, argp); 3241 case SIOCGIFCONF: 3242 return dev_ifconf(net, argp); 3243 case SIOCETHTOOL: 3244 return ethtool_ioctl(net, argp); 3245 case SIOCWANDEV: 3246 return compat_siocwandev(net, argp); 3247 case SIOCGIFMAP: 3248 case SIOCSIFMAP: 3249 return compat_sioc_ifmap(net, cmd, argp); 3250 case SIOCBONDENSLAVE: 3251 case SIOCBONDRELEASE: 3252 case SIOCBONDSETHWADDR: 3253 case SIOCBONDCHANGEACTIVE: 3254 return bond_ioctl(net, cmd, argp); 3255 case SIOCADDRT: 3256 case SIOCDELRT: 3257 return routing_ioctl(net, sock, cmd, argp); 3258 case SIOCGSTAMP: 3259 return do_siocgstamp(net, sock, cmd, argp); 3260 case SIOCGSTAMPNS: 3261 return do_siocgstampns(net, sock, cmd, argp); 3262 case SIOCBONDSLAVEINFOQUERY: 3263 case SIOCBONDINFOQUERY: 3264 case SIOCSHWTSTAMP: 3265 case SIOCGHWTSTAMP: 3266 return compat_ifr_data_ioctl(net, cmd, argp); 3267 3268 case FIOSETOWN: 3269 case SIOCSPGRP: 3270 case FIOGETOWN: 3271 case SIOCGPGRP: 3272 case SIOCBRADDBR: 3273 case SIOCBRDELBR: 3274 case SIOCGIFVLAN: 3275 case SIOCSIFVLAN: 3276 case SIOCADDDLCI: 3277 case SIOCDELDLCI: 3278 return sock_ioctl(file, cmd, arg); 3279 3280 case SIOCGIFFLAGS: 3281 case SIOCSIFFLAGS: 3282 case SIOCGIFMETRIC: 3283 case SIOCSIFMETRIC: 3284 case SIOCGIFMTU: 3285 case SIOCSIFMTU: 3286 case SIOCGIFMEM: 3287 case SIOCSIFMEM: 3288 case SIOCGIFHWADDR: 3289 case SIOCSIFHWADDR: 3290 case SIOCADDMULTI: 3291 case SIOCDELMULTI: 3292 case SIOCGIFINDEX: 3293 case SIOCGIFADDR: 3294 case SIOCSIFADDR: 3295 case SIOCSIFHWBROADCAST: 3296 case SIOCDIFADDR: 3297 case SIOCGIFBRDADDR: 3298 case SIOCSIFBRDADDR: 3299 case SIOCGIFDSTADDR: 3300 case SIOCSIFDSTADDR: 3301 case SIOCGIFNETMASK: 3302 case SIOCSIFNETMASK: 3303 case SIOCSIFPFLAGS: 3304 case SIOCGIFPFLAGS: 3305 case SIOCGIFTXQLEN: 3306 case SIOCSIFTXQLEN: 3307 case SIOCBRADDIF: 3308 case SIOCBRDELIF: 3309 case SIOCSIFNAME: 3310 case SIOCGMIIPHY: 3311 case SIOCGMIIREG: 3312 case SIOCSMIIREG: 3313 return dev_ifsioc(net, sock, cmd, argp); 3314 3315 case SIOCSARP: 3316 case SIOCGARP: 3317 case SIOCDARP: 3318 case SIOCATMARK: 3319 return sock_do_ioctl(net, sock, cmd, arg); 3320 } 3321 3322 return -ENOIOCTLCMD; 3323 } 3324 3325 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3326 unsigned long arg) 3327 { 3328 struct socket *sock = file->private_data; 3329 int ret = -ENOIOCTLCMD; 3330 struct sock *sk; 3331 struct net *net; 3332 3333 sk = sock->sk; 3334 net = sock_net(sk); 3335 3336 if (sock->ops->compat_ioctl) 3337 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3338 3339 if (ret == -ENOIOCTLCMD && 3340 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3341 ret = compat_wext_handle_ioctl(net, cmd, arg); 3342 3343 if (ret == -ENOIOCTLCMD) 3344 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3345 3346 return ret; 3347 } 3348 #endif 3349 3350 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3351 { 3352 return sock->ops->bind(sock, addr, addrlen); 3353 } 3354 EXPORT_SYMBOL(kernel_bind); 3355 3356 int kernel_listen(struct socket *sock, int backlog) 3357 { 3358 return sock->ops->listen(sock, backlog); 3359 } 3360 EXPORT_SYMBOL(kernel_listen); 3361 3362 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3363 { 3364 struct sock *sk = sock->sk; 3365 int err; 3366 3367 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3368 newsock); 3369 if (err < 0) 3370 goto done; 3371 3372 err = sock->ops->accept(sock, *newsock, flags); 3373 if (err < 0) { 3374 sock_release(*newsock); 3375 *newsock = NULL; 3376 goto done; 3377 } 3378 3379 (*newsock)->ops = sock->ops; 3380 __module_get((*newsock)->ops->owner); 3381 3382 done: 3383 return err; 3384 } 3385 EXPORT_SYMBOL(kernel_accept); 3386 3387 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3388 int flags) 3389 { 3390 return sock->ops->connect(sock, addr, addrlen, flags); 3391 } 3392 EXPORT_SYMBOL(kernel_connect); 3393 3394 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3395 int *addrlen) 3396 { 3397 return sock->ops->getname(sock, addr, addrlen, 0); 3398 } 3399 EXPORT_SYMBOL(kernel_getsockname); 3400 3401 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3402 int *addrlen) 3403 { 3404 return sock->ops->getname(sock, addr, addrlen, 1); 3405 } 3406 EXPORT_SYMBOL(kernel_getpeername); 3407 3408 int kernel_getsockopt(struct socket *sock, int level, int optname, 3409 char *optval, int *optlen) 3410 { 3411 mm_segment_t oldfs = get_fs(); 3412 char __user *uoptval; 3413 int __user *uoptlen; 3414 int err; 3415 3416 uoptval = (char __user __force *) optval; 3417 uoptlen = (int __user __force *) optlen; 3418 3419 set_fs(KERNEL_DS); 3420 if (level == SOL_SOCKET) 3421 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3422 else 3423 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3424 uoptlen); 3425 set_fs(oldfs); 3426 return err; 3427 } 3428 EXPORT_SYMBOL(kernel_getsockopt); 3429 3430 int kernel_setsockopt(struct socket *sock, int level, int optname, 3431 char *optval, unsigned int optlen) 3432 { 3433 mm_segment_t oldfs = get_fs(); 3434 char __user *uoptval; 3435 int err; 3436 3437 uoptval = (char __user __force *) optval; 3438 3439 set_fs(KERNEL_DS); 3440 if (level == SOL_SOCKET) 3441 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3442 else 3443 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3444 optlen); 3445 set_fs(oldfs); 3446 return err; 3447 } 3448 EXPORT_SYMBOL(kernel_setsockopt); 3449 3450 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3451 size_t size, int flags) 3452 { 3453 if (sock->ops->sendpage) 3454 return sock->ops->sendpage(sock, page, offset, size, flags); 3455 3456 return sock_no_sendpage(sock, page, offset, size, flags); 3457 } 3458 EXPORT_SYMBOL(kernel_sendpage); 3459 3460 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3461 { 3462 mm_segment_t oldfs = get_fs(); 3463 int err; 3464 3465 set_fs(KERNEL_DS); 3466 err = sock->ops->ioctl(sock, cmd, arg); 3467 set_fs(oldfs); 3468 3469 return err; 3470 } 3471 EXPORT_SYMBOL(kernel_sock_ioctl); 3472 3473 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3474 { 3475 return sock->ops->shutdown(sock, how); 3476 } 3477 EXPORT_SYMBOL(kernel_sock_shutdown); 3478