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 <linux/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 ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 117 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 118 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 119 120 static int sock_close(struct inode *inode, struct file *file); 121 static unsigned int sock_poll(struct file *file, 122 struct poll_table_struct *wait); 123 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 124 #ifdef CONFIG_COMPAT 125 static long compat_sock_ioctl(struct file *file, 126 unsigned int cmd, unsigned long arg); 127 #endif 128 static int sock_fasync(int fd, struct file *filp, int on); 129 static ssize_t sock_sendpage(struct file *file, struct page *page, 130 int offset, size_t size, loff_t *ppos, int more); 131 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 132 struct pipe_inode_info *pipe, size_t len, 133 unsigned int flags); 134 135 /* 136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 137 * in the operation structures but are done directly via the socketcall() multiplexor. 138 */ 139 140 static const struct file_operations socket_file_ops = { 141 .owner = THIS_MODULE, 142 .llseek = no_llseek, 143 .read_iter = sock_read_iter, 144 .write_iter = sock_write_iter, 145 .poll = sock_poll, 146 .unlocked_ioctl = sock_ioctl, 147 #ifdef CONFIG_COMPAT 148 .compat_ioctl = compat_sock_ioctl, 149 #endif 150 .mmap = sock_mmap, 151 .release = sock_close, 152 .fasync = sock_fasync, 153 .sendpage = sock_sendpage, 154 .splice_write = generic_splice_sendpage, 155 .splice_read = sock_splice_read, 156 }; 157 158 /* 159 * The protocol list. Each protocol is registered in here. 160 */ 161 162 static DEFINE_SPINLOCK(net_family_lock); 163 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 164 165 /* 166 * Statistics counters of the socket lists 167 */ 168 169 static DEFINE_PER_CPU(int, sockets_in_use); 170 171 /* 172 * Support routines. 173 * Move socket addresses back and forth across the kernel/user 174 * divide and look after the messy bits. 175 */ 176 177 /** 178 * move_addr_to_kernel - copy a socket address into kernel space 179 * @uaddr: Address in user space 180 * @kaddr: Address in kernel space 181 * @ulen: Length in user space 182 * 183 * The address is copied into kernel space. If the provided address is 184 * too long an error code of -EINVAL is returned. If the copy gives 185 * invalid addresses -EFAULT is returned. On a success 0 is returned. 186 */ 187 188 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 189 { 190 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 191 return -EINVAL; 192 if (ulen == 0) 193 return 0; 194 if (copy_from_user(kaddr, uaddr, ulen)) 195 return -EFAULT; 196 return audit_sockaddr(ulen, kaddr); 197 } 198 199 /** 200 * move_addr_to_user - copy an address to user space 201 * @kaddr: kernel space address 202 * @klen: length of address in kernel 203 * @uaddr: user space address 204 * @ulen: pointer to user length field 205 * 206 * The value pointed to by ulen on entry is the buffer length available. 207 * This is overwritten with the buffer space used. -EINVAL is returned 208 * if an overlong buffer is specified or a negative buffer size. -EFAULT 209 * is returned if either the buffer or the length field are not 210 * accessible. 211 * After copying the data up to the limit the user specifies, the true 212 * length of the data is written over the length limit the user 213 * specified. Zero is returned for a success. 214 */ 215 216 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 217 void __user *uaddr, int __user *ulen) 218 { 219 int err; 220 int len; 221 222 BUG_ON(klen > sizeof(struct sockaddr_storage)); 223 err = get_user(len, ulen); 224 if (err) 225 return err; 226 if (len > klen) 227 len = klen; 228 if (len < 0) 229 return -EINVAL; 230 if (len) { 231 if (audit_sockaddr(klen, kaddr)) 232 return -ENOMEM; 233 if (copy_to_user(uaddr, kaddr, len)) 234 return -EFAULT; 235 } 236 /* 237 * "fromlen shall refer to the value before truncation.." 238 * 1003.1g 239 */ 240 return __put_user(klen, ulen); 241 } 242 243 static struct kmem_cache *sock_inode_cachep __read_mostly; 244 245 static struct inode *sock_alloc_inode(struct super_block *sb) 246 { 247 struct socket_alloc *ei; 248 struct socket_wq *wq; 249 250 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 251 if (!ei) 252 return NULL; 253 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 254 if (!wq) { 255 kmem_cache_free(sock_inode_cachep, ei); 256 return NULL; 257 } 258 init_waitqueue_head(&wq->wait); 259 wq->fasync_list = NULL; 260 wq->flags = 0; 261 RCU_INIT_POINTER(ei->socket.wq, wq); 262 263 ei->socket.state = SS_UNCONNECTED; 264 ei->socket.flags = 0; 265 ei->socket.ops = NULL; 266 ei->socket.sk = NULL; 267 ei->socket.file = NULL; 268 269 return &ei->vfs_inode; 270 } 271 272 static void sock_destroy_inode(struct inode *inode) 273 { 274 struct socket_alloc *ei; 275 struct socket_wq *wq; 276 277 ei = container_of(inode, struct socket_alloc, vfs_inode); 278 wq = rcu_dereference_protected(ei->socket.wq, 1); 279 kfree_rcu(wq, rcu); 280 kmem_cache_free(sock_inode_cachep, ei); 281 } 282 283 static void init_once(void *foo) 284 { 285 struct socket_alloc *ei = (struct socket_alloc *)foo; 286 287 inode_init_once(&ei->vfs_inode); 288 } 289 290 static void init_inodecache(void) 291 { 292 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 293 sizeof(struct socket_alloc), 294 0, 295 (SLAB_HWCACHE_ALIGN | 296 SLAB_RECLAIM_ACCOUNT | 297 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 298 init_once); 299 BUG_ON(sock_inode_cachep == NULL); 300 } 301 302 static const struct super_operations sockfs_ops = { 303 .alloc_inode = sock_alloc_inode, 304 .destroy_inode = sock_destroy_inode, 305 .statfs = simple_statfs, 306 }; 307 308 /* 309 * sockfs_dname() is called from d_path(). 310 */ 311 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 312 { 313 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 314 d_inode(dentry)->i_ino); 315 } 316 317 static const struct dentry_operations sockfs_dentry_operations = { 318 .d_dname = sockfs_dname, 319 }; 320 321 static int sockfs_xattr_get(const struct xattr_handler *handler, 322 struct dentry *dentry, struct inode *inode, 323 const char *suffix, void *value, size_t size) 324 { 325 if (value) { 326 if (dentry->d_name.len + 1 > size) 327 return -ERANGE; 328 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 329 } 330 return dentry->d_name.len + 1; 331 } 332 333 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 334 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 335 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 336 337 static const struct xattr_handler sockfs_xattr_handler = { 338 .name = XATTR_NAME_SOCKPROTONAME, 339 .get = sockfs_xattr_get, 340 }; 341 342 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 343 struct dentry *dentry, struct inode *inode, 344 const char *suffix, const void *value, 345 size_t size, int flags) 346 { 347 /* Handled by LSM. */ 348 return -EAGAIN; 349 } 350 351 static const struct xattr_handler sockfs_security_xattr_handler = { 352 .prefix = XATTR_SECURITY_PREFIX, 353 .set = sockfs_security_xattr_set, 354 }; 355 356 static const struct xattr_handler *sockfs_xattr_handlers[] = { 357 &sockfs_xattr_handler, 358 &sockfs_security_xattr_handler, 359 NULL 360 }; 361 362 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 363 int flags, const char *dev_name, void *data) 364 { 365 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 366 sockfs_xattr_handlers, 367 &sockfs_dentry_operations, SOCKFS_MAGIC); 368 } 369 370 static struct vfsmount *sock_mnt __read_mostly; 371 372 static struct file_system_type sock_fs_type = { 373 .name = "sockfs", 374 .mount = sockfs_mount, 375 .kill_sb = kill_anon_super, 376 }; 377 378 /* 379 * Obtains the first available file descriptor and sets it up for use. 380 * 381 * These functions create file structures and maps them to fd space 382 * of the current process. On success it returns file descriptor 383 * and file struct implicitly stored in sock->file. 384 * Note that another thread may close file descriptor before we return 385 * from this function. We use the fact that now we do not refer 386 * to socket after mapping. If one day we will need it, this 387 * function will increment ref. count on file by 1. 388 * 389 * In any case returned fd MAY BE not valid! 390 * This race condition is unavoidable 391 * with shared fd spaces, we cannot solve it inside kernel, 392 * but we take care of internal coherence yet. 393 */ 394 395 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 396 { 397 struct qstr name = { .name = "" }; 398 struct path path; 399 struct file *file; 400 401 if (dname) { 402 name.name = dname; 403 name.len = strlen(name.name); 404 } else if (sock->sk) { 405 name.name = sock->sk->sk_prot_creator->name; 406 name.len = strlen(name.name); 407 } 408 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 409 if (unlikely(!path.dentry)) { 410 sock_release(sock); 411 return ERR_PTR(-ENOMEM); 412 } 413 path.mnt = mntget(sock_mnt); 414 415 d_instantiate(path.dentry, SOCK_INODE(sock)); 416 417 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 418 &socket_file_ops); 419 if (IS_ERR(file)) { 420 /* drop dentry, keep inode for a bit */ 421 ihold(d_inode(path.dentry)); 422 path_put(&path); 423 /* ... and now kill it properly */ 424 sock_release(sock); 425 return file; 426 } 427 428 sock->file = file; 429 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 430 file->private_data = sock; 431 return file; 432 } 433 EXPORT_SYMBOL(sock_alloc_file); 434 435 static int sock_map_fd(struct socket *sock, int flags) 436 { 437 struct file *newfile; 438 int fd = get_unused_fd_flags(flags); 439 if (unlikely(fd < 0)) { 440 sock_release(sock); 441 return fd; 442 } 443 444 newfile = sock_alloc_file(sock, flags, NULL); 445 if (likely(!IS_ERR(newfile))) { 446 fd_install(fd, newfile); 447 return fd; 448 } 449 450 put_unused_fd(fd); 451 return PTR_ERR(newfile); 452 } 453 454 struct socket *sock_from_file(struct file *file, int *err) 455 { 456 if (file->f_op == &socket_file_ops) 457 return file->private_data; /* set in sock_map_fd */ 458 459 *err = -ENOTSOCK; 460 return NULL; 461 } 462 EXPORT_SYMBOL(sock_from_file); 463 464 /** 465 * sockfd_lookup - Go from a file number to its socket slot 466 * @fd: file handle 467 * @err: pointer to an error code return 468 * 469 * The file handle passed in is locked and the socket it is bound 470 * to is returned. If an error occurs the err pointer is overwritten 471 * with a negative errno code and NULL is returned. The function checks 472 * for both invalid handles and passing a handle which is not a socket. 473 * 474 * On a success the socket object pointer is returned. 475 */ 476 477 struct socket *sockfd_lookup(int fd, int *err) 478 { 479 struct file *file; 480 struct socket *sock; 481 482 file = fget(fd); 483 if (!file) { 484 *err = -EBADF; 485 return NULL; 486 } 487 488 sock = sock_from_file(file, err); 489 if (!sock) 490 fput(file); 491 return sock; 492 } 493 EXPORT_SYMBOL(sockfd_lookup); 494 495 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 496 { 497 struct fd f = fdget(fd); 498 struct socket *sock; 499 500 *err = -EBADF; 501 if (f.file) { 502 sock = sock_from_file(f.file, err); 503 if (likely(sock)) { 504 *fput_needed = f.flags; 505 return sock; 506 } 507 fdput(f); 508 } 509 return NULL; 510 } 511 512 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 513 size_t size) 514 { 515 ssize_t len; 516 ssize_t used = 0; 517 518 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 519 if (len < 0) 520 return len; 521 used += len; 522 if (buffer) { 523 if (size < used) 524 return -ERANGE; 525 buffer += len; 526 } 527 528 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 529 used += len; 530 if (buffer) { 531 if (size < used) 532 return -ERANGE; 533 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 534 buffer += len; 535 } 536 537 return used; 538 } 539 540 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 541 { 542 int err = simple_setattr(dentry, iattr); 543 544 if (!err && (iattr->ia_valid & ATTR_UID)) { 545 struct socket *sock = SOCKET_I(d_inode(dentry)); 546 547 sock->sk->sk_uid = iattr->ia_uid; 548 } 549 550 return err; 551 } 552 553 static const struct inode_operations sockfs_inode_ops = { 554 .listxattr = sockfs_listxattr, 555 .setattr = sockfs_setattr, 556 }; 557 558 /** 559 * sock_alloc - allocate a socket 560 * 561 * Allocate a new inode and socket object. The two are bound together 562 * and initialised. The socket is then returned. If we are out of inodes 563 * NULL is returned. 564 */ 565 566 struct socket *sock_alloc(void) 567 { 568 struct inode *inode; 569 struct socket *sock; 570 571 inode = new_inode_pseudo(sock_mnt->mnt_sb); 572 if (!inode) 573 return NULL; 574 575 sock = SOCKET_I(inode); 576 577 inode->i_ino = get_next_ino(); 578 inode->i_mode = S_IFSOCK | S_IRWXUGO; 579 inode->i_uid = current_fsuid(); 580 inode->i_gid = current_fsgid(); 581 inode->i_op = &sockfs_inode_ops; 582 583 this_cpu_add(sockets_in_use, 1); 584 return sock; 585 } 586 EXPORT_SYMBOL(sock_alloc); 587 588 /** 589 * sock_release - close a socket 590 * @sock: socket to close 591 * 592 * The socket is released from the protocol stack if it has a release 593 * callback, and the inode is then released if the socket is bound to 594 * an inode not a file. 595 */ 596 597 void sock_release(struct socket *sock) 598 { 599 if (sock->ops) { 600 struct module *owner = sock->ops->owner; 601 602 sock->ops->release(sock); 603 sock->ops = NULL; 604 module_put(owner); 605 } 606 607 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 608 pr_err("%s: fasync list not empty!\n", __func__); 609 610 this_cpu_sub(sockets_in_use, 1); 611 if (!sock->file) { 612 iput(SOCK_INODE(sock)); 613 return; 614 } 615 sock->file = NULL; 616 } 617 EXPORT_SYMBOL(sock_release); 618 619 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 620 { 621 u8 flags = *tx_flags; 622 623 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 624 flags |= SKBTX_HW_TSTAMP; 625 626 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 627 flags |= SKBTX_SW_TSTAMP; 628 629 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 630 flags |= SKBTX_SCHED_TSTAMP; 631 632 *tx_flags = flags; 633 } 634 EXPORT_SYMBOL(__sock_tx_timestamp); 635 636 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 637 { 638 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 639 BUG_ON(ret == -EIOCBQUEUED); 640 return ret; 641 } 642 643 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 644 { 645 int err = security_socket_sendmsg(sock, msg, 646 msg_data_left(msg)); 647 648 return err ?: sock_sendmsg_nosec(sock, msg); 649 } 650 EXPORT_SYMBOL(sock_sendmsg); 651 652 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 653 struct kvec *vec, size_t num, size_t size) 654 { 655 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 656 return sock_sendmsg(sock, msg); 657 } 658 EXPORT_SYMBOL(kernel_sendmsg); 659 660 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 661 struct kvec *vec, size_t num, size_t size) 662 { 663 struct socket *sock = sk->sk_socket; 664 665 if (!sock->ops->sendmsg_locked) 666 return sock_no_sendmsg_locked(sk, msg, size); 667 668 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 669 670 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 671 } 672 EXPORT_SYMBOL(kernel_sendmsg_locked); 673 674 static bool skb_is_err_queue(const struct sk_buff *skb) 675 { 676 /* pkt_type of skbs enqueued on the error queue are set to 677 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 678 * in recvmsg, since skbs received on a local socket will never 679 * have a pkt_type of PACKET_OUTGOING. 680 */ 681 return skb->pkt_type == PACKET_OUTGOING; 682 } 683 684 /* On transmit, software and hardware timestamps are returned independently. 685 * As the two skb clones share the hardware timestamp, which may be updated 686 * before the software timestamp is received, a hardware TX timestamp may be 687 * returned only if there is no software TX timestamp. Ignore false software 688 * timestamps, which may be made in the __sock_recv_timestamp() call when the 689 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a 690 * hardware timestamp. 691 */ 692 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 693 { 694 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 695 } 696 697 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 698 { 699 struct scm_ts_pktinfo ts_pktinfo; 700 struct net_device *orig_dev; 701 702 if (!skb_mac_header_was_set(skb)) 703 return; 704 705 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 706 707 rcu_read_lock(); 708 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 709 if (orig_dev) 710 ts_pktinfo.if_index = orig_dev->ifindex; 711 rcu_read_unlock(); 712 713 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 714 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 715 sizeof(ts_pktinfo), &ts_pktinfo); 716 } 717 718 /* 719 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 720 */ 721 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 722 struct sk_buff *skb) 723 { 724 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 725 struct scm_timestamping tss; 726 int empty = 1, false_tstamp = 0; 727 struct skb_shared_hwtstamps *shhwtstamps = 728 skb_hwtstamps(skb); 729 730 /* Race occurred between timestamp enabling and packet 731 receiving. Fill in the current time for now. */ 732 if (need_software_tstamp && skb->tstamp == 0) { 733 __net_timestamp(skb); 734 false_tstamp = 1; 735 } 736 737 if (need_software_tstamp) { 738 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 739 struct timeval tv; 740 skb_get_timestamp(skb, &tv); 741 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 742 sizeof(tv), &tv); 743 } else { 744 struct timespec ts; 745 skb_get_timestampns(skb, &ts); 746 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 747 sizeof(ts), &ts); 748 } 749 } 750 751 memset(&tss, 0, sizeof(tss)); 752 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 753 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 754 empty = 0; 755 if (shhwtstamps && 756 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 757 !skb_is_swtx_tstamp(skb, false_tstamp) && 758 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 759 empty = 0; 760 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 761 !skb_is_err_queue(skb)) 762 put_ts_pktinfo(msg, skb); 763 } 764 if (!empty) { 765 put_cmsg(msg, SOL_SOCKET, 766 SCM_TIMESTAMPING, sizeof(tss), &tss); 767 768 if (skb_is_err_queue(skb) && skb->len && 769 SKB_EXT_ERR(skb)->opt_stats) 770 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 771 skb->len, skb->data); 772 } 773 } 774 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 775 776 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 777 struct sk_buff *skb) 778 { 779 int ack; 780 781 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 782 return; 783 if (!skb->wifi_acked_valid) 784 return; 785 786 ack = skb->wifi_acked; 787 788 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 789 } 790 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 791 792 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 793 struct sk_buff *skb) 794 { 795 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 796 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 797 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 798 } 799 800 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 801 struct sk_buff *skb) 802 { 803 sock_recv_timestamp(msg, sk, skb); 804 sock_recv_drops(msg, sk, skb); 805 } 806 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 807 808 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 809 int flags) 810 { 811 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 812 } 813 814 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 815 { 816 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 817 818 return err ?: sock_recvmsg_nosec(sock, msg, flags); 819 } 820 EXPORT_SYMBOL(sock_recvmsg); 821 822 /** 823 * kernel_recvmsg - Receive a message from a socket (kernel space) 824 * @sock: The socket to receive the message from 825 * @msg: Received message 826 * @vec: Input s/g array for message data 827 * @num: Size of input s/g array 828 * @size: Number of bytes to read 829 * @flags: Message flags (MSG_DONTWAIT, etc...) 830 * 831 * On return the msg structure contains the scatter/gather array passed in the 832 * vec argument. The array is modified so that it consists of the unfilled 833 * portion of the original array. 834 * 835 * The returned value is the total number of bytes received, or an error. 836 */ 837 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 838 struct kvec *vec, size_t num, size_t size, int flags) 839 { 840 mm_segment_t oldfs = get_fs(); 841 int result; 842 843 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); 844 set_fs(KERNEL_DS); 845 result = sock_recvmsg(sock, msg, flags); 846 set_fs(oldfs); 847 return result; 848 } 849 EXPORT_SYMBOL(kernel_recvmsg); 850 851 static ssize_t sock_sendpage(struct file *file, struct page *page, 852 int offset, size_t size, loff_t *ppos, int more) 853 { 854 struct socket *sock; 855 int flags; 856 857 sock = file->private_data; 858 859 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 860 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 861 flags |= more; 862 863 return kernel_sendpage(sock, page, offset, size, flags); 864 } 865 866 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 867 struct pipe_inode_info *pipe, size_t len, 868 unsigned int flags) 869 { 870 struct socket *sock = file->private_data; 871 872 if (unlikely(!sock->ops->splice_read)) 873 return -EINVAL; 874 875 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 876 } 877 878 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 879 { 880 struct file *file = iocb->ki_filp; 881 struct socket *sock = file->private_data; 882 struct msghdr msg = {.msg_iter = *to, 883 .msg_iocb = iocb}; 884 ssize_t res; 885 886 if (file->f_flags & O_NONBLOCK) 887 msg.msg_flags = MSG_DONTWAIT; 888 889 if (iocb->ki_pos != 0) 890 return -ESPIPE; 891 892 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 893 return 0; 894 895 res = sock_recvmsg(sock, &msg, msg.msg_flags); 896 *to = msg.msg_iter; 897 return res; 898 } 899 900 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 901 { 902 struct file *file = iocb->ki_filp; 903 struct socket *sock = file->private_data; 904 struct msghdr msg = {.msg_iter = *from, 905 .msg_iocb = iocb}; 906 ssize_t res; 907 908 if (iocb->ki_pos != 0) 909 return -ESPIPE; 910 911 if (file->f_flags & O_NONBLOCK) 912 msg.msg_flags = MSG_DONTWAIT; 913 914 if (sock->type == SOCK_SEQPACKET) 915 msg.msg_flags |= MSG_EOR; 916 917 res = sock_sendmsg(sock, &msg); 918 *from = msg.msg_iter; 919 return res; 920 } 921 922 /* 923 * Atomic setting of ioctl hooks to avoid race 924 * with module unload. 925 */ 926 927 static DEFINE_MUTEX(br_ioctl_mutex); 928 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 929 930 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 931 { 932 mutex_lock(&br_ioctl_mutex); 933 br_ioctl_hook = hook; 934 mutex_unlock(&br_ioctl_mutex); 935 } 936 EXPORT_SYMBOL(brioctl_set); 937 938 static DEFINE_MUTEX(vlan_ioctl_mutex); 939 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 940 941 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 942 { 943 mutex_lock(&vlan_ioctl_mutex); 944 vlan_ioctl_hook = hook; 945 mutex_unlock(&vlan_ioctl_mutex); 946 } 947 EXPORT_SYMBOL(vlan_ioctl_set); 948 949 static DEFINE_MUTEX(dlci_ioctl_mutex); 950 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 951 952 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 953 { 954 mutex_lock(&dlci_ioctl_mutex); 955 dlci_ioctl_hook = hook; 956 mutex_unlock(&dlci_ioctl_mutex); 957 } 958 EXPORT_SYMBOL(dlci_ioctl_set); 959 960 static long sock_do_ioctl(struct net *net, struct socket *sock, 961 unsigned int cmd, unsigned long arg) 962 { 963 int err; 964 void __user *argp = (void __user *)arg; 965 966 err = sock->ops->ioctl(sock, cmd, arg); 967 968 /* 969 * If this ioctl is unknown try to hand it down 970 * to the NIC driver. 971 */ 972 if (err == -ENOIOCTLCMD) 973 err = dev_ioctl(net, cmd, argp); 974 975 return err; 976 } 977 978 /* 979 * With an ioctl, arg may well be a user mode pointer, but we don't know 980 * what to do with it - that's up to the protocol still. 981 */ 982 983 static struct ns_common *get_net_ns(struct ns_common *ns) 984 { 985 return &get_net(container_of(ns, struct net, ns))->ns; 986 } 987 988 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 989 { 990 struct socket *sock; 991 struct sock *sk; 992 void __user *argp = (void __user *)arg; 993 int pid, err; 994 struct net *net; 995 996 sock = file->private_data; 997 sk = sock->sk; 998 net = sock_net(sk); 999 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 1000 err = dev_ioctl(net, cmd, argp); 1001 } else 1002 #ifdef CONFIG_WEXT_CORE 1003 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1004 err = dev_ioctl(net, cmd, argp); 1005 } else 1006 #endif 1007 switch (cmd) { 1008 case FIOSETOWN: 1009 case SIOCSPGRP: 1010 err = -EFAULT; 1011 if (get_user(pid, (int __user *)argp)) 1012 break; 1013 err = f_setown(sock->file, pid, 1); 1014 break; 1015 case FIOGETOWN: 1016 case SIOCGPGRP: 1017 err = put_user(f_getown(sock->file), 1018 (int __user *)argp); 1019 break; 1020 case SIOCGIFBR: 1021 case SIOCSIFBR: 1022 case SIOCBRADDBR: 1023 case SIOCBRDELBR: 1024 err = -ENOPKG; 1025 if (!br_ioctl_hook) 1026 request_module("bridge"); 1027 1028 mutex_lock(&br_ioctl_mutex); 1029 if (br_ioctl_hook) 1030 err = br_ioctl_hook(net, cmd, argp); 1031 mutex_unlock(&br_ioctl_mutex); 1032 break; 1033 case SIOCGIFVLAN: 1034 case SIOCSIFVLAN: 1035 err = -ENOPKG; 1036 if (!vlan_ioctl_hook) 1037 request_module("8021q"); 1038 1039 mutex_lock(&vlan_ioctl_mutex); 1040 if (vlan_ioctl_hook) 1041 err = vlan_ioctl_hook(net, argp); 1042 mutex_unlock(&vlan_ioctl_mutex); 1043 break; 1044 case SIOCADDDLCI: 1045 case SIOCDELDLCI: 1046 err = -ENOPKG; 1047 if (!dlci_ioctl_hook) 1048 request_module("dlci"); 1049 1050 mutex_lock(&dlci_ioctl_mutex); 1051 if (dlci_ioctl_hook) 1052 err = dlci_ioctl_hook(cmd, argp); 1053 mutex_unlock(&dlci_ioctl_mutex); 1054 break; 1055 case SIOCGSKNS: 1056 err = -EPERM; 1057 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1058 break; 1059 1060 err = open_related_ns(&net->ns, get_net_ns); 1061 break; 1062 default: 1063 err = sock_do_ioctl(net, sock, cmd, arg); 1064 break; 1065 } 1066 return err; 1067 } 1068 1069 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1070 { 1071 int err; 1072 struct socket *sock = NULL; 1073 1074 err = security_socket_create(family, type, protocol, 1); 1075 if (err) 1076 goto out; 1077 1078 sock = sock_alloc(); 1079 if (!sock) { 1080 err = -ENOMEM; 1081 goto out; 1082 } 1083 1084 sock->type = type; 1085 err = security_socket_post_create(sock, family, type, protocol, 1); 1086 if (err) 1087 goto out_release; 1088 1089 out: 1090 *res = sock; 1091 return err; 1092 out_release: 1093 sock_release(sock); 1094 sock = NULL; 1095 goto out; 1096 } 1097 EXPORT_SYMBOL(sock_create_lite); 1098 1099 /* No kernel lock held - perfect */ 1100 static unsigned int sock_poll(struct file *file, poll_table *wait) 1101 { 1102 unsigned int busy_flag = 0; 1103 struct socket *sock; 1104 1105 /* 1106 * We can't return errors to poll, so it's either yes or no. 1107 */ 1108 sock = file->private_data; 1109 1110 if (sk_can_busy_loop(sock->sk)) { 1111 /* this socket can poll_ll so tell the system call */ 1112 busy_flag = POLL_BUSY_LOOP; 1113 1114 /* once, only if requested by syscall */ 1115 if (wait && (wait->_key & POLL_BUSY_LOOP)) 1116 sk_busy_loop(sock->sk, 1); 1117 } 1118 1119 return busy_flag | sock->ops->poll(file, sock, wait); 1120 } 1121 1122 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1123 { 1124 struct socket *sock = file->private_data; 1125 1126 return sock->ops->mmap(file, sock, vma); 1127 } 1128 1129 static int sock_close(struct inode *inode, struct file *filp) 1130 { 1131 sock_release(SOCKET_I(inode)); 1132 return 0; 1133 } 1134 1135 /* 1136 * Update the socket async list 1137 * 1138 * Fasync_list locking strategy. 1139 * 1140 * 1. fasync_list is modified only under process context socket lock 1141 * i.e. under semaphore. 1142 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1143 * or under socket lock 1144 */ 1145 1146 static int sock_fasync(int fd, struct file *filp, int on) 1147 { 1148 struct socket *sock = filp->private_data; 1149 struct sock *sk = sock->sk; 1150 struct socket_wq *wq; 1151 1152 if (sk == NULL) 1153 return -EINVAL; 1154 1155 lock_sock(sk); 1156 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); 1157 fasync_helper(fd, filp, on, &wq->fasync_list); 1158 1159 if (!wq->fasync_list) 1160 sock_reset_flag(sk, SOCK_FASYNC); 1161 else 1162 sock_set_flag(sk, SOCK_FASYNC); 1163 1164 release_sock(sk); 1165 return 0; 1166 } 1167 1168 /* This function may be called only under rcu_lock */ 1169 1170 int sock_wake_async(struct socket_wq *wq, int how, int band) 1171 { 1172 if (!wq || !wq->fasync_list) 1173 return -1; 1174 1175 switch (how) { 1176 case SOCK_WAKE_WAITD: 1177 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1178 break; 1179 goto call_kill; 1180 case SOCK_WAKE_SPACE: 1181 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1182 break; 1183 /* fall through */ 1184 case SOCK_WAKE_IO: 1185 call_kill: 1186 kill_fasync(&wq->fasync_list, SIGIO, band); 1187 break; 1188 case SOCK_WAKE_URG: 1189 kill_fasync(&wq->fasync_list, SIGURG, band); 1190 } 1191 1192 return 0; 1193 } 1194 EXPORT_SYMBOL(sock_wake_async); 1195 1196 int __sock_create(struct net *net, int family, int type, int protocol, 1197 struct socket **res, int kern) 1198 { 1199 int err; 1200 struct socket *sock; 1201 const struct net_proto_family *pf; 1202 1203 /* 1204 * Check protocol is in range 1205 */ 1206 if (family < 0 || family >= NPROTO) 1207 return -EAFNOSUPPORT; 1208 if (type < 0 || type >= SOCK_MAX) 1209 return -EINVAL; 1210 1211 /* Compatibility. 1212 1213 This uglymoron is moved from INET layer to here to avoid 1214 deadlock in module load. 1215 */ 1216 if (family == PF_INET && type == SOCK_PACKET) { 1217 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1218 current->comm); 1219 family = PF_PACKET; 1220 } 1221 1222 err = security_socket_create(family, type, protocol, kern); 1223 if (err) 1224 return err; 1225 1226 /* 1227 * Allocate the socket and allow the family to set things up. if 1228 * the protocol is 0, the family is instructed to select an appropriate 1229 * default. 1230 */ 1231 sock = sock_alloc(); 1232 if (!sock) { 1233 net_warn_ratelimited("socket: no more sockets\n"); 1234 return -ENFILE; /* Not exactly a match, but its the 1235 closest posix thing */ 1236 } 1237 1238 sock->type = type; 1239 1240 #ifdef CONFIG_MODULES 1241 /* Attempt to load a protocol module if the find failed. 1242 * 1243 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1244 * requested real, full-featured networking support upon configuration. 1245 * Otherwise module support will break! 1246 */ 1247 if (rcu_access_pointer(net_families[family]) == NULL) 1248 request_module("net-pf-%d", family); 1249 #endif 1250 1251 rcu_read_lock(); 1252 pf = rcu_dereference(net_families[family]); 1253 err = -EAFNOSUPPORT; 1254 if (!pf) 1255 goto out_release; 1256 1257 /* 1258 * We will call the ->create function, that possibly is in a loadable 1259 * module, so we have to bump that loadable module refcnt first. 1260 */ 1261 if (!try_module_get(pf->owner)) 1262 goto out_release; 1263 1264 /* Now protected by module ref count */ 1265 rcu_read_unlock(); 1266 1267 err = pf->create(net, sock, protocol, kern); 1268 if (err < 0) 1269 goto out_module_put; 1270 1271 /* 1272 * Now to bump the refcnt of the [loadable] module that owns this 1273 * socket at sock_release time we decrement its refcnt. 1274 */ 1275 if (!try_module_get(sock->ops->owner)) 1276 goto out_module_busy; 1277 1278 /* 1279 * Now that we're done with the ->create function, the [loadable] 1280 * module can have its refcnt decremented 1281 */ 1282 module_put(pf->owner); 1283 err = security_socket_post_create(sock, family, type, protocol, kern); 1284 if (err) 1285 goto out_sock_release; 1286 *res = sock; 1287 1288 return 0; 1289 1290 out_module_busy: 1291 err = -EAFNOSUPPORT; 1292 out_module_put: 1293 sock->ops = NULL; 1294 module_put(pf->owner); 1295 out_sock_release: 1296 sock_release(sock); 1297 return err; 1298 1299 out_release: 1300 rcu_read_unlock(); 1301 goto out_sock_release; 1302 } 1303 EXPORT_SYMBOL(__sock_create); 1304 1305 int sock_create(int family, int type, int protocol, struct socket **res) 1306 { 1307 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1308 } 1309 EXPORT_SYMBOL(sock_create); 1310 1311 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1312 { 1313 return __sock_create(net, family, type, protocol, res, 1); 1314 } 1315 EXPORT_SYMBOL(sock_create_kern); 1316 1317 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1318 { 1319 int retval; 1320 struct socket *sock; 1321 int flags; 1322 1323 /* Check the SOCK_* constants for consistency. */ 1324 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1325 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1326 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1327 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1328 1329 flags = type & ~SOCK_TYPE_MASK; 1330 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1331 return -EINVAL; 1332 type &= SOCK_TYPE_MASK; 1333 1334 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1335 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1336 1337 retval = sock_create(family, type, protocol, &sock); 1338 if (retval < 0) 1339 return retval; 1340 1341 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1342 } 1343 1344 /* 1345 * Create a pair of connected sockets. 1346 */ 1347 1348 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1349 int __user *, usockvec) 1350 { 1351 struct socket *sock1, *sock2; 1352 int fd1, fd2, err; 1353 struct file *newfile1, *newfile2; 1354 int flags; 1355 1356 flags = type & ~SOCK_TYPE_MASK; 1357 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1358 return -EINVAL; 1359 type &= SOCK_TYPE_MASK; 1360 1361 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1362 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1363 1364 /* 1365 * reserve descriptors and make sure we won't fail 1366 * to return them to userland. 1367 */ 1368 fd1 = get_unused_fd_flags(flags); 1369 if (unlikely(fd1 < 0)) 1370 return fd1; 1371 1372 fd2 = get_unused_fd_flags(flags); 1373 if (unlikely(fd2 < 0)) { 1374 put_unused_fd(fd1); 1375 return fd2; 1376 } 1377 1378 err = put_user(fd1, &usockvec[0]); 1379 if (err) 1380 goto out; 1381 1382 err = put_user(fd2, &usockvec[1]); 1383 if (err) 1384 goto out; 1385 1386 /* 1387 * Obtain the first socket and check if the underlying protocol 1388 * supports the socketpair call. 1389 */ 1390 1391 err = sock_create(family, type, protocol, &sock1); 1392 if (unlikely(err < 0)) 1393 goto out; 1394 1395 err = sock_create(family, type, protocol, &sock2); 1396 if (unlikely(err < 0)) { 1397 sock_release(sock1); 1398 goto out; 1399 } 1400 1401 err = sock1->ops->socketpair(sock1, sock2); 1402 if (unlikely(err < 0)) { 1403 sock_release(sock2); 1404 sock_release(sock1); 1405 goto out; 1406 } 1407 1408 newfile1 = sock_alloc_file(sock1, flags, NULL); 1409 if (IS_ERR(newfile1)) { 1410 err = PTR_ERR(newfile1); 1411 sock_release(sock2); 1412 goto out; 1413 } 1414 1415 newfile2 = sock_alloc_file(sock2, flags, NULL); 1416 if (IS_ERR(newfile2)) { 1417 err = PTR_ERR(newfile2); 1418 fput(newfile1); 1419 goto out; 1420 } 1421 1422 audit_fd_pair(fd1, fd2); 1423 1424 fd_install(fd1, newfile1); 1425 fd_install(fd2, newfile2); 1426 return 0; 1427 1428 out: 1429 put_unused_fd(fd2); 1430 put_unused_fd(fd1); 1431 return err; 1432 } 1433 1434 /* 1435 * Bind a name to a socket. Nothing much to do here since it's 1436 * the protocol's responsibility to handle the local address. 1437 * 1438 * We move the socket address to kernel space before we call 1439 * the protocol layer (having also checked the address is ok). 1440 */ 1441 1442 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1443 { 1444 struct socket *sock; 1445 struct sockaddr_storage address; 1446 int err, fput_needed; 1447 1448 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1449 if (sock) { 1450 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1451 if (err >= 0) { 1452 err = security_socket_bind(sock, 1453 (struct sockaddr *)&address, 1454 addrlen); 1455 if (!err) 1456 err = sock->ops->bind(sock, 1457 (struct sockaddr *) 1458 &address, addrlen); 1459 } 1460 fput_light(sock->file, fput_needed); 1461 } 1462 return err; 1463 } 1464 1465 /* 1466 * Perform a listen. Basically, we allow the protocol to do anything 1467 * necessary for a listen, and if that works, we mark the socket as 1468 * ready for listening. 1469 */ 1470 1471 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1472 { 1473 struct socket *sock; 1474 int err, fput_needed; 1475 int somaxconn; 1476 1477 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1478 if (sock) { 1479 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1480 if ((unsigned int)backlog > somaxconn) 1481 backlog = somaxconn; 1482 1483 err = security_socket_listen(sock, backlog); 1484 if (!err) 1485 err = sock->ops->listen(sock, backlog); 1486 1487 fput_light(sock->file, fput_needed); 1488 } 1489 return err; 1490 } 1491 1492 /* 1493 * For accept, we attempt to create a new socket, set up the link 1494 * with the client, wake up the client, then return the new 1495 * connected fd. We collect the address of the connector in kernel 1496 * space and move it to user at the very end. This is unclean because 1497 * we open the socket then return an error. 1498 * 1499 * 1003.1g adds the ability to recvmsg() to query connection pending 1500 * status to recvmsg. We need to add that support in a way thats 1501 * clean when we restucture accept also. 1502 */ 1503 1504 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1505 int __user *, upeer_addrlen, int, flags) 1506 { 1507 struct socket *sock, *newsock; 1508 struct file *newfile; 1509 int err, len, newfd, fput_needed; 1510 struct sockaddr_storage address; 1511 1512 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1513 return -EINVAL; 1514 1515 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1516 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1517 1518 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1519 if (!sock) 1520 goto out; 1521 1522 err = -ENFILE; 1523 newsock = sock_alloc(); 1524 if (!newsock) 1525 goto out_put; 1526 1527 newsock->type = sock->type; 1528 newsock->ops = sock->ops; 1529 1530 /* 1531 * We don't need try_module_get here, as the listening socket (sock) 1532 * has the protocol module (sock->ops->owner) held. 1533 */ 1534 __module_get(newsock->ops->owner); 1535 1536 newfd = get_unused_fd_flags(flags); 1537 if (unlikely(newfd < 0)) { 1538 err = newfd; 1539 sock_release(newsock); 1540 goto out_put; 1541 } 1542 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1543 if (IS_ERR(newfile)) { 1544 err = PTR_ERR(newfile); 1545 put_unused_fd(newfd); 1546 goto out_put; 1547 } 1548 1549 err = security_socket_accept(sock, newsock); 1550 if (err) 1551 goto out_fd; 1552 1553 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 1554 if (err < 0) 1555 goto out_fd; 1556 1557 if (upeer_sockaddr) { 1558 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1559 &len, 2) < 0) { 1560 err = -ECONNABORTED; 1561 goto out_fd; 1562 } 1563 err = move_addr_to_user(&address, 1564 len, upeer_sockaddr, upeer_addrlen); 1565 if (err < 0) 1566 goto out_fd; 1567 } 1568 1569 /* File flags are not inherited via accept() unlike another OSes. */ 1570 1571 fd_install(newfd, newfile); 1572 err = newfd; 1573 1574 out_put: 1575 fput_light(sock->file, fput_needed); 1576 out: 1577 return err; 1578 out_fd: 1579 fput(newfile); 1580 put_unused_fd(newfd); 1581 goto out_put; 1582 } 1583 1584 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1585 int __user *, upeer_addrlen) 1586 { 1587 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1588 } 1589 1590 /* 1591 * Attempt to connect to a socket with the server address. The address 1592 * is in user space so we verify it is OK and move it to kernel space. 1593 * 1594 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1595 * break bindings 1596 * 1597 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1598 * other SEQPACKET protocols that take time to connect() as it doesn't 1599 * include the -EINPROGRESS status for such sockets. 1600 */ 1601 1602 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1603 int, addrlen) 1604 { 1605 struct socket *sock; 1606 struct sockaddr_storage address; 1607 int err, fput_needed; 1608 1609 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1610 if (!sock) 1611 goto out; 1612 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1613 if (err < 0) 1614 goto out_put; 1615 1616 err = 1617 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1618 if (err) 1619 goto out_put; 1620 1621 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1622 sock->file->f_flags); 1623 out_put: 1624 fput_light(sock->file, fput_needed); 1625 out: 1626 return err; 1627 } 1628 1629 /* 1630 * Get the local address ('name') of a socket object. Move the obtained 1631 * name to user space. 1632 */ 1633 1634 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1635 int __user *, usockaddr_len) 1636 { 1637 struct socket *sock; 1638 struct sockaddr_storage address; 1639 int len, err, fput_needed; 1640 1641 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1642 if (!sock) 1643 goto out; 1644 1645 err = security_socket_getsockname(sock); 1646 if (err) 1647 goto out_put; 1648 1649 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1650 if (err) 1651 goto out_put; 1652 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 1653 1654 out_put: 1655 fput_light(sock->file, fput_needed); 1656 out: 1657 return err; 1658 } 1659 1660 /* 1661 * Get the remote address ('name') of a socket object. Move the obtained 1662 * name to user space. 1663 */ 1664 1665 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1666 int __user *, usockaddr_len) 1667 { 1668 struct socket *sock; 1669 struct sockaddr_storage address; 1670 int len, err, fput_needed; 1671 1672 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1673 if (sock != NULL) { 1674 err = security_socket_getpeername(sock); 1675 if (err) { 1676 fput_light(sock->file, fput_needed); 1677 return err; 1678 } 1679 1680 err = 1681 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1682 1); 1683 if (!err) 1684 err = move_addr_to_user(&address, len, usockaddr, 1685 usockaddr_len); 1686 fput_light(sock->file, fput_needed); 1687 } 1688 return err; 1689 } 1690 1691 /* 1692 * Send a datagram to a given address. We move the address into kernel 1693 * space and check the user space data area is readable before invoking 1694 * the protocol. 1695 */ 1696 1697 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1698 unsigned int, flags, struct sockaddr __user *, addr, 1699 int, addr_len) 1700 { 1701 struct socket *sock; 1702 struct sockaddr_storage address; 1703 int err; 1704 struct msghdr msg; 1705 struct iovec iov; 1706 int fput_needed; 1707 1708 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1709 if (unlikely(err)) 1710 return err; 1711 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1712 if (!sock) 1713 goto out; 1714 1715 msg.msg_name = NULL; 1716 msg.msg_control = NULL; 1717 msg.msg_controllen = 0; 1718 msg.msg_namelen = 0; 1719 if (addr) { 1720 err = move_addr_to_kernel(addr, addr_len, &address); 1721 if (err < 0) 1722 goto out_put; 1723 msg.msg_name = (struct sockaddr *)&address; 1724 msg.msg_namelen = addr_len; 1725 } 1726 if (sock->file->f_flags & O_NONBLOCK) 1727 flags |= MSG_DONTWAIT; 1728 msg.msg_flags = flags; 1729 err = sock_sendmsg(sock, &msg); 1730 1731 out_put: 1732 fput_light(sock->file, fput_needed); 1733 out: 1734 return err; 1735 } 1736 1737 /* 1738 * Send a datagram down a socket. 1739 */ 1740 1741 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1742 unsigned int, flags) 1743 { 1744 return sys_sendto(fd, buff, len, flags, NULL, 0); 1745 } 1746 1747 /* 1748 * Receive a frame from the socket and optionally record the address of the 1749 * sender. We verify the buffers are writable and if needed move the 1750 * sender address from kernel to user space. 1751 */ 1752 1753 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1754 unsigned int, flags, struct sockaddr __user *, addr, 1755 int __user *, addr_len) 1756 { 1757 struct socket *sock; 1758 struct iovec iov; 1759 struct msghdr msg; 1760 struct sockaddr_storage address; 1761 int err, err2; 1762 int fput_needed; 1763 1764 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1765 if (unlikely(err)) 1766 return err; 1767 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1768 if (!sock) 1769 goto out; 1770 1771 msg.msg_control = NULL; 1772 msg.msg_controllen = 0; 1773 /* Save some cycles and don't copy the address if not needed */ 1774 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1775 /* We assume all kernel code knows the size of sockaddr_storage */ 1776 msg.msg_namelen = 0; 1777 msg.msg_iocb = NULL; 1778 msg.msg_flags = 0; 1779 if (sock->file->f_flags & O_NONBLOCK) 1780 flags |= MSG_DONTWAIT; 1781 err = sock_recvmsg(sock, &msg, flags); 1782 1783 if (err >= 0 && addr != NULL) { 1784 err2 = move_addr_to_user(&address, 1785 msg.msg_namelen, addr, addr_len); 1786 if (err2 < 0) 1787 err = err2; 1788 } 1789 1790 fput_light(sock->file, fput_needed); 1791 out: 1792 return err; 1793 } 1794 1795 /* 1796 * Receive a datagram from a socket. 1797 */ 1798 1799 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1800 unsigned int, flags) 1801 { 1802 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1803 } 1804 1805 /* 1806 * Set a socket option. Because we don't know the option lengths we have 1807 * to pass the user mode parameter for the protocols to sort out. 1808 */ 1809 1810 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1811 char __user *, optval, int, optlen) 1812 { 1813 int err, fput_needed; 1814 struct socket *sock; 1815 1816 if (optlen < 0) 1817 return -EINVAL; 1818 1819 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1820 if (sock != NULL) { 1821 err = security_socket_setsockopt(sock, level, optname); 1822 if (err) 1823 goto out_put; 1824 1825 if (level == SOL_SOCKET) 1826 err = 1827 sock_setsockopt(sock, level, optname, optval, 1828 optlen); 1829 else 1830 err = 1831 sock->ops->setsockopt(sock, level, optname, optval, 1832 optlen); 1833 out_put: 1834 fput_light(sock->file, fput_needed); 1835 } 1836 return err; 1837 } 1838 1839 /* 1840 * Get a socket option. Because we don't know the option lengths we have 1841 * to pass a user mode parameter for the protocols to sort out. 1842 */ 1843 1844 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1845 char __user *, optval, int __user *, optlen) 1846 { 1847 int err, fput_needed; 1848 struct socket *sock; 1849 1850 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1851 if (sock != NULL) { 1852 err = security_socket_getsockopt(sock, level, optname); 1853 if (err) 1854 goto out_put; 1855 1856 if (level == SOL_SOCKET) 1857 err = 1858 sock_getsockopt(sock, level, optname, optval, 1859 optlen); 1860 else 1861 err = 1862 sock->ops->getsockopt(sock, level, optname, optval, 1863 optlen); 1864 out_put: 1865 fput_light(sock->file, fput_needed); 1866 } 1867 return err; 1868 } 1869 1870 /* 1871 * Shutdown a socket. 1872 */ 1873 1874 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1875 { 1876 int err, fput_needed; 1877 struct socket *sock; 1878 1879 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1880 if (sock != NULL) { 1881 err = security_socket_shutdown(sock, how); 1882 if (!err) 1883 err = sock->ops->shutdown(sock, how); 1884 fput_light(sock->file, fput_needed); 1885 } 1886 return err; 1887 } 1888 1889 /* A couple of helpful macros for getting the address of the 32/64 bit 1890 * fields which are the same type (int / unsigned) on our platforms. 1891 */ 1892 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1893 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1894 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1895 1896 struct used_address { 1897 struct sockaddr_storage name; 1898 unsigned int name_len; 1899 }; 1900 1901 static int copy_msghdr_from_user(struct msghdr *kmsg, 1902 struct user_msghdr __user *umsg, 1903 struct sockaddr __user **save_addr, 1904 struct iovec **iov) 1905 { 1906 struct user_msghdr msg; 1907 ssize_t err; 1908 1909 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 1910 return -EFAULT; 1911 1912 kmsg->msg_control = (void __force *)msg.msg_control; 1913 kmsg->msg_controllen = msg.msg_controllen; 1914 kmsg->msg_flags = msg.msg_flags; 1915 1916 kmsg->msg_namelen = msg.msg_namelen; 1917 if (!msg.msg_name) 1918 kmsg->msg_namelen = 0; 1919 1920 if (kmsg->msg_namelen < 0) 1921 return -EINVAL; 1922 1923 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 1924 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 1925 1926 if (save_addr) 1927 *save_addr = msg.msg_name; 1928 1929 if (msg.msg_name && kmsg->msg_namelen) { 1930 if (!save_addr) { 1931 err = move_addr_to_kernel(msg.msg_name, 1932 kmsg->msg_namelen, 1933 kmsg->msg_name); 1934 if (err < 0) 1935 return err; 1936 } 1937 } else { 1938 kmsg->msg_name = NULL; 1939 kmsg->msg_namelen = 0; 1940 } 1941 1942 if (msg.msg_iovlen > UIO_MAXIOV) 1943 return -EMSGSIZE; 1944 1945 kmsg->msg_iocb = NULL; 1946 1947 return import_iovec(save_addr ? READ : WRITE, 1948 msg.msg_iov, msg.msg_iovlen, 1949 UIO_FASTIOV, iov, &kmsg->msg_iter); 1950 } 1951 1952 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 1953 struct msghdr *msg_sys, unsigned int flags, 1954 struct used_address *used_address, 1955 unsigned int allowed_msghdr_flags) 1956 { 1957 struct compat_msghdr __user *msg_compat = 1958 (struct compat_msghdr __user *)msg; 1959 struct sockaddr_storage address; 1960 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1961 unsigned char ctl[sizeof(struct cmsghdr) + 20] 1962 __aligned(sizeof(__kernel_size_t)); 1963 /* 20 is size of ipv6_pktinfo */ 1964 unsigned char *ctl_buf = ctl; 1965 int ctl_len; 1966 ssize_t err; 1967 1968 msg_sys->msg_name = &address; 1969 1970 if (MSG_CMSG_COMPAT & flags) 1971 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 1972 else 1973 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 1974 if (err < 0) 1975 return err; 1976 1977 err = -ENOBUFS; 1978 1979 if (msg_sys->msg_controllen > INT_MAX) 1980 goto out_freeiov; 1981 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 1982 ctl_len = msg_sys->msg_controllen; 1983 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 1984 err = 1985 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 1986 sizeof(ctl)); 1987 if (err) 1988 goto out_freeiov; 1989 ctl_buf = msg_sys->msg_control; 1990 ctl_len = msg_sys->msg_controllen; 1991 } else if (ctl_len) { 1992 BUILD_BUG_ON(sizeof(struct cmsghdr) != 1993 CMSG_ALIGN(sizeof(struct cmsghdr))); 1994 if (ctl_len > sizeof(ctl)) { 1995 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 1996 if (ctl_buf == NULL) 1997 goto out_freeiov; 1998 } 1999 err = -EFAULT; 2000 /* 2001 * Careful! Before this, msg_sys->msg_control contains a user pointer. 2002 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 2003 * checking falls down on this. 2004 */ 2005 if (copy_from_user(ctl_buf, 2006 (void __user __force *)msg_sys->msg_control, 2007 ctl_len)) 2008 goto out_freectl; 2009 msg_sys->msg_control = ctl_buf; 2010 } 2011 msg_sys->msg_flags = flags; 2012 2013 if (sock->file->f_flags & O_NONBLOCK) 2014 msg_sys->msg_flags |= MSG_DONTWAIT; 2015 /* 2016 * If this is sendmmsg() and current destination address is same as 2017 * previously succeeded address, omit asking LSM's decision. 2018 * used_address->name_len is initialized to UINT_MAX so that the first 2019 * destination address never matches. 2020 */ 2021 if (used_address && msg_sys->msg_name && 2022 used_address->name_len == msg_sys->msg_namelen && 2023 !memcmp(&used_address->name, msg_sys->msg_name, 2024 used_address->name_len)) { 2025 err = sock_sendmsg_nosec(sock, msg_sys); 2026 goto out_freectl; 2027 } 2028 err = sock_sendmsg(sock, msg_sys); 2029 /* 2030 * If this is sendmmsg() and sending to current destination address was 2031 * successful, remember it. 2032 */ 2033 if (used_address && err >= 0) { 2034 used_address->name_len = msg_sys->msg_namelen; 2035 if (msg_sys->msg_name) 2036 memcpy(&used_address->name, msg_sys->msg_name, 2037 used_address->name_len); 2038 } 2039 2040 out_freectl: 2041 if (ctl_buf != ctl) 2042 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2043 out_freeiov: 2044 kfree(iov); 2045 return err; 2046 } 2047 2048 /* 2049 * BSD sendmsg interface 2050 */ 2051 2052 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2053 { 2054 int fput_needed, err; 2055 struct msghdr msg_sys; 2056 struct socket *sock; 2057 2058 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2059 if (!sock) 2060 goto out; 2061 2062 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2063 2064 fput_light(sock->file, fput_needed); 2065 out: 2066 return err; 2067 } 2068 2069 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2070 { 2071 if (flags & MSG_CMSG_COMPAT) 2072 return -EINVAL; 2073 return __sys_sendmsg(fd, msg, flags); 2074 } 2075 2076 /* 2077 * Linux sendmmsg interface 2078 */ 2079 2080 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2081 unsigned int flags) 2082 { 2083 int fput_needed, err, datagrams; 2084 struct socket *sock; 2085 struct mmsghdr __user *entry; 2086 struct compat_mmsghdr __user *compat_entry; 2087 struct msghdr msg_sys; 2088 struct used_address used_address; 2089 unsigned int oflags = flags; 2090 2091 if (vlen > UIO_MAXIOV) 2092 vlen = UIO_MAXIOV; 2093 2094 datagrams = 0; 2095 2096 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2097 if (!sock) 2098 return err; 2099 2100 used_address.name_len = UINT_MAX; 2101 entry = mmsg; 2102 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2103 err = 0; 2104 flags |= MSG_BATCH; 2105 2106 while (datagrams < vlen) { 2107 if (datagrams == vlen - 1) 2108 flags = oflags; 2109 2110 if (MSG_CMSG_COMPAT & flags) { 2111 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2112 &msg_sys, flags, &used_address, MSG_EOR); 2113 if (err < 0) 2114 break; 2115 err = __put_user(err, &compat_entry->msg_len); 2116 ++compat_entry; 2117 } else { 2118 err = ___sys_sendmsg(sock, 2119 (struct user_msghdr __user *)entry, 2120 &msg_sys, flags, &used_address, MSG_EOR); 2121 if (err < 0) 2122 break; 2123 err = put_user(err, &entry->msg_len); 2124 ++entry; 2125 } 2126 2127 if (err) 2128 break; 2129 ++datagrams; 2130 if (msg_data_left(&msg_sys)) 2131 break; 2132 cond_resched(); 2133 } 2134 2135 fput_light(sock->file, fput_needed); 2136 2137 /* We only return an error if no datagrams were able to be sent */ 2138 if (datagrams != 0) 2139 return datagrams; 2140 2141 return err; 2142 } 2143 2144 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2145 unsigned int, vlen, unsigned int, flags) 2146 { 2147 if (flags & MSG_CMSG_COMPAT) 2148 return -EINVAL; 2149 return __sys_sendmmsg(fd, mmsg, vlen, flags); 2150 } 2151 2152 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2153 struct msghdr *msg_sys, unsigned int flags, int nosec) 2154 { 2155 struct compat_msghdr __user *msg_compat = 2156 (struct compat_msghdr __user *)msg; 2157 struct iovec iovstack[UIO_FASTIOV]; 2158 struct iovec *iov = iovstack; 2159 unsigned long cmsg_ptr; 2160 int len; 2161 ssize_t err; 2162 2163 /* kernel mode address */ 2164 struct sockaddr_storage addr; 2165 2166 /* user mode address pointers */ 2167 struct sockaddr __user *uaddr; 2168 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2169 2170 msg_sys->msg_name = &addr; 2171 2172 if (MSG_CMSG_COMPAT & flags) 2173 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2174 else 2175 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 2176 if (err < 0) 2177 return err; 2178 2179 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2180 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2181 2182 /* We assume all kernel code knows the size of sockaddr_storage */ 2183 msg_sys->msg_namelen = 0; 2184 2185 if (sock->file->f_flags & O_NONBLOCK) 2186 flags |= MSG_DONTWAIT; 2187 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 2188 if (err < 0) 2189 goto out_freeiov; 2190 len = err; 2191 2192 if (uaddr != NULL) { 2193 err = move_addr_to_user(&addr, 2194 msg_sys->msg_namelen, uaddr, 2195 uaddr_len); 2196 if (err < 0) 2197 goto out_freeiov; 2198 } 2199 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2200 COMPAT_FLAGS(msg)); 2201 if (err) 2202 goto out_freeiov; 2203 if (MSG_CMSG_COMPAT & flags) 2204 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2205 &msg_compat->msg_controllen); 2206 else 2207 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2208 &msg->msg_controllen); 2209 if (err) 2210 goto out_freeiov; 2211 err = len; 2212 2213 out_freeiov: 2214 kfree(iov); 2215 return err; 2216 } 2217 2218 /* 2219 * BSD recvmsg interface 2220 */ 2221 2222 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2223 { 2224 int fput_needed, err; 2225 struct msghdr msg_sys; 2226 struct socket *sock; 2227 2228 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2229 if (!sock) 2230 goto out; 2231 2232 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2233 2234 fput_light(sock->file, fput_needed); 2235 out: 2236 return err; 2237 } 2238 2239 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2240 unsigned int, flags) 2241 { 2242 if (flags & MSG_CMSG_COMPAT) 2243 return -EINVAL; 2244 return __sys_recvmsg(fd, msg, flags); 2245 } 2246 2247 /* 2248 * Linux recvmmsg interface 2249 */ 2250 2251 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2252 unsigned int flags, struct timespec *timeout) 2253 { 2254 int fput_needed, err, datagrams; 2255 struct socket *sock; 2256 struct mmsghdr __user *entry; 2257 struct compat_mmsghdr __user *compat_entry; 2258 struct msghdr msg_sys; 2259 struct timespec64 end_time; 2260 struct timespec64 timeout64; 2261 2262 if (timeout && 2263 poll_select_set_timeout(&end_time, timeout->tv_sec, 2264 timeout->tv_nsec)) 2265 return -EINVAL; 2266 2267 datagrams = 0; 2268 2269 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2270 if (!sock) 2271 return err; 2272 2273 err = sock_error(sock->sk); 2274 if (err) { 2275 datagrams = err; 2276 goto out_put; 2277 } 2278 2279 entry = mmsg; 2280 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2281 2282 while (datagrams < vlen) { 2283 /* 2284 * No need to ask LSM for more than the first datagram. 2285 */ 2286 if (MSG_CMSG_COMPAT & flags) { 2287 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2288 &msg_sys, flags & ~MSG_WAITFORONE, 2289 datagrams); 2290 if (err < 0) 2291 break; 2292 err = __put_user(err, &compat_entry->msg_len); 2293 ++compat_entry; 2294 } else { 2295 err = ___sys_recvmsg(sock, 2296 (struct user_msghdr __user *)entry, 2297 &msg_sys, flags & ~MSG_WAITFORONE, 2298 datagrams); 2299 if (err < 0) 2300 break; 2301 err = put_user(err, &entry->msg_len); 2302 ++entry; 2303 } 2304 2305 if (err) 2306 break; 2307 ++datagrams; 2308 2309 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2310 if (flags & MSG_WAITFORONE) 2311 flags |= MSG_DONTWAIT; 2312 2313 if (timeout) { 2314 ktime_get_ts64(&timeout64); 2315 *timeout = timespec64_to_timespec( 2316 timespec64_sub(end_time, timeout64)); 2317 if (timeout->tv_sec < 0) { 2318 timeout->tv_sec = timeout->tv_nsec = 0; 2319 break; 2320 } 2321 2322 /* Timeout, return less than vlen datagrams */ 2323 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2324 break; 2325 } 2326 2327 /* Out of band data, return right away */ 2328 if (msg_sys.msg_flags & MSG_OOB) 2329 break; 2330 cond_resched(); 2331 } 2332 2333 if (err == 0) 2334 goto out_put; 2335 2336 if (datagrams == 0) { 2337 datagrams = err; 2338 goto out_put; 2339 } 2340 2341 /* 2342 * We may return less entries than requested (vlen) if the 2343 * sock is non block and there aren't enough datagrams... 2344 */ 2345 if (err != -EAGAIN) { 2346 /* 2347 * ... or if recvmsg returns an error after we 2348 * received some datagrams, where we record the 2349 * error to return on the next call or if the 2350 * app asks about it using getsockopt(SO_ERROR). 2351 */ 2352 sock->sk->sk_err = -err; 2353 } 2354 out_put: 2355 fput_light(sock->file, fput_needed); 2356 2357 return datagrams; 2358 } 2359 2360 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2361 unsigned int, vlen, unsigned int, flags, 2362 struct timespec __user *, timeout) 2363 { 2364 int datagrams; 2365 struct timespec timeout_sys; 2366 2367 if (flags & MSG_CMSG_COMPAT) 2368 return -EINVAL; 2369 2370 if (!timeout) 2371 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2372 2373 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2374 return -EFAULT; 2375 2376 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2377 2378 if (datagrams > 0 && 2379 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2380 datagrams = -EFAULT; 2381 2382 return datagrams; 2383 } 2384 2385 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2386 /* Argument list sizes for sys_socketcall */ 2387 #define AL(x) ((x) * sizeof(unsigned long)) 2388 static const unsigned char nargs[21] = { 2389 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2390 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2391 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2392 AL(4), AL(5), AL(4) 2393 }; 2394 2395 #undef AL 2396 2397 /* 2398 * System call vectors. 2399 * 2400 * Argument checking cleaned up. Saved 20% in size. 2401 * This function doesn't need to set the kernel lock because 2402 * it is set by the callees. 2403 */ 2404 2405 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2406 { 2407 unsigned long a[AUDITSC_ARGS]; 2408 unsigned long a0, a1; 2409 int err; 2410 unsigned int len; 2411 2412 if (call < 1 || call > SYS_SENDMMSG) 2413 return -EINVAL; 2414 2415 len = nargs[call]; 2416 if (len > sizeof(a)) 2417 return -EINVAL; 2418 2419 /* copy_from_user should be SMP safe. */ 2420 if (copy_from_user(a, args, len)) 2421 return -EFAULT; 2422 2423 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2424 if (err) 2425 return err; 2426 2427 a0 = a[0]; 2428 a1 = a[1]; 2429 2430 switch (call) { 2431 case SYS_SOCKET: 2432 err = sys_socket(a0, a1, a[2]); 2433 break; 2434 case SYS_BIND: 2435 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2436 break; 2437 case SYS_CONNECT: 2438 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2439 break; 2440 case SYS_LISTEN: 2441 err = sys_listen(a0, a1); 2442 break; 2443 case SYS_ACCEPT: 2444 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2445 (int __user *)a[2], 0); 2446 break; 2447 case SYS_GETSOCKNAME: 2448 err = 2449 sys_getsockname(a0, (struct sockaddr __user *)a1, 2450 (int __user *)a[2]); 2451 break; 2452 case SYS_GETPEERNAME: 2453 err = 2454 sys_getpeername(a0, (struct sockaddr __user *)a1, 2455 (int __user *)a[2]); 2456 break; 2457 case SYS_SOCKETPAIR: 2458 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2459 break; 2460 case SYS_SEND: 2461 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2462 break; 2463 case SYS_SENDTO: 2464 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2465 (struct sockaddr __user *)a[4], a[5]); 2466 break; 2467 case SYS_RECV: 2468 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2469 break; 2470 case SYS_RECVFROM: 2471 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2472 (struct sockaddr __user *)a[4], 2473 (int __user *)a[5]); 2474 break; 2475 case SYS_SHUTDOWN: 2476 err = sys_shutdown(a0, a1); 2477 break; 2478 case SYS_SETSOCKOPT: 2479 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2480 break; 2481 case SYS_GETSOCKOPT: 2482 err = 2483 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2484 (int __user *)a[4]); 2485 break; 2486 case SYS_SENDMSG: 2487 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2488 break; 2489 case SYS_SENDMMSG: 2490 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2491 break; 2492 case SYS_RECVMSG: 2493 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2494 break; 2495 case SYS_RECVMMSG: 2496 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2497 (struct timespec __user *)a[4]); 2498 break; 2499 case SYS_ACCEPT4: 2500 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2501 (int __user *)a[2], a[3]); 2502 break; 2503 default: 2504 err = -EINVAL; 2505 break; 2506 } 2507 return err; 2508 } 2509 2510 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2511 2512 /** 2513 * sock_register - add a socket protocol handler 2514 * @ops: description of protocol 2515 * 2516 * This function is called by a protocol handler that wants to 2517 * advertise its address family, and have it linked into the 2518 * socket interface. The value ops->family corresponds to the 2519 * socket system call protocol family. 2520 */ 2521 int sock_register(const struct net_proto_family *ops) 2522 { 2523 int err; 2524 2525 if (ops->family >= NPROTO) { 2526 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2527 return -ENOBUFS; 2528 } 2529 2530 spin_lock(&net_family_lock); 2531 if (rcu_dereference_protected(net_families[ops->family], 2532 lockdep_is_held(&net_family_lock))) 2533 err = -EEXIST; 2534 else { 2535 rcu_assign_pointer(net_families[ops->family], ops); 2536 err = 0; 2537 } 2538 spin_unlock(&net_family_lock); 2539 2540 pr_info("NET: Registered protocol family %d\n", ops->family); 2541 return err; 2542 } 2543 EXPORT_SYMBOL(sock_register); 2544 2545 /** 2546 * sock_unregister - remove a protocol handler 2547 * @family: protocol family to remove 2548 * 2549 * This function is called by a protocol handler that wants to 2550 * remove its address family, and have it unlinked from the 2551 * new socket creation. 2552 * 2553 * If protocol handler is a module, then it can use module reference 2554 * counts to protect against new references. If protocol handler is not 2555 * a module then it needs to provide its own protection in 2556 * the ops->create routine. 2557 */ 2558 void sock_unregister(int family) 2559 { 2560 BUG_ON(family < 0 || family >= NPROTO); 2561 2562 spin_lock(&net_family_lock); 2563 RCU_INIT_POINTER(net_families[family], NULL); 2564 spin_unlock(&net_family_lock); 2565 2566 synchronize_rcu(); 2567 2568 pr_info("NET: Unregistered protocol family %d\n", family); 2569 } 2570 EXPORT_SYMBOL(sock_unregister); 2571 2572 static int __init sock_init(void) 2573 { 2574 int err; 2575 /* 2576 * Initialize the network sysctl infrastructure. 2577 */ 2578 err = net_sysctl_init(); 2579 if (err) 2580 goto out; 2581 2582 /* 2583 * Initialize skbuff SLAB cache 2584 */ 2585 skb_init(); 2586 2587 /* 2588 * Initialize the protocols module. 2589 */ 2590 2591 init_inodecache(); 2592 2593 err = register_filesystem(&sock_fs_type); 2594 if (err) 2595 goto out_fs; 2596 sock_mnt = kern_mount(&sock_fs_type); 2597 if (IS_ERR(sock_mnt)) { 2598 err = PTR_ERR(sock_mnt); 2599 goto out_mount; 2600 } 2601 2602 /* The real protocol initialization is performed in later initcalls. 2603 */ 2604 2605 #ifdef CONFIG_NETFILTER 2606 err = netfilter_init(); 2607 if (err) 2608 goto out; 2609 #endif 2610 2611 ptp_classifier_init(); 2612 2613 out: 2614 return err; 2615 2616 out_mount: 2617 unregister_filesystem(&sock_fs_type); 2618 out_fs: 2619 goto out; 2620 } 2621 2622 core_initcall(sock_init); /* early initcall */ 2623 2624 static int __init jit_init(void) 2625 { 2626 #ifdef CONFIG_BPF_JIT_ALWAYS_ON 2627 bpf_jit_enable = 1; 2628 #endif 2629 return 0; 2630 } 2631 pure_initcall(jit_init); 2632 2633 #ifdef CONFIG_PROC_FS 2634 void socket_seq_show(struct seq_file *seq) 2635 { 2636 int cpu; 2637 int counter = 0; 2638 2639 for_each_possible_cpu(cpu) 2640 counter += per_cpu(sockets_in_use, cpu); 2641 2642 /* It can be negative, by the way. 8) */ 2643 if (counter < 0) 2644 counter = 0; 2645 2646 seq_printf(seq, "sockets: used %d\n", counter); 2647 } 2648 #endif /* CONFIG_PROC_FS */ 2649 2650 #ifdef CONFIG_COMPAT 2651 static int do_siocgstamp(struct net *net, struct socket *sock, 2652 unsigned int cmd, void __user *up) 2653 { 2654 mm_segment_t old_fs = get_fs(); 2655 struct timeval ktv; 2656 int err; 2657 2658 set_fs(KERNEL_DS); 2659 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2660 set_fs(old_fs); 2661 if (!err) 2662 err = compat_put_timeval(&ktv, up); 2663 2664 return err; 2665 } 2666 2667 static int do_siocgstampns(struct net *net, struct socket *sock, 2668 unsigned int cmd, void __user *up) 2669 { 2670 mm_segment_t old_fs = get_fs(); 2671 struct timespec kts; 2672 int err; 2673 2674 set_fs(KERNEL_DS); 2675 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2676 set_fs(old_fs); 2677 if (!err) 2678 err = compat_put_timespec(&kts, up); 2679 2680 return err; 2681 } 2682 2683 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2684 { 2685 struct ifreq __user *uifr; 2686 int err; 2687 2688 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2689 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2690 return -EFAULT; 2691 2692 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2693 if (err) 2694 return err; 2695 2696 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2697 return -EFAULT; 2698 2699 return 0; 2700 } 2701 2702 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2703 { 2704 struct compat_ifconf ifc32; 2705 struct ifconf ifc; 2706 struct ifconf __user *uifc; 2707 struct compat_ifreq __user *ifr32; 2708 struct ifreq __user *ifr; 2709 unsigned int i, j; 2710 int err; 2711 2712 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2713 return -EFAULT; 2714 2715 memset(&ifc, 0, sizeof(ifc)); 2716 if (ifc32.ifcbuf == 0) { 2717 ifc32.ifc_len = 0; 2718 ifc.ifc_len = 0; 2719 ifc.ifc_req = NULL; 2720 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2721 } else { 2722 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * 2723 sizeof(struct ifreq); 2724 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2725 ifc.ifc_len = len; 2726 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2727 ifr32 = compat_ptr(ifc32.ifcbuf); 2728 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { 2729 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2730 return -EFAULT; 2731 ifr++; 2732 ifr32++; 2733 } 2734 } 2735 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2736 return -EFAULT; 2737 2738 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2739 if (err) 2740 return err; 2741 2742 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2743 return -EFAULT; 2744 2745 ifr = ifc.ifc_req; 2746 ifr32 = compat_ptr(ifc32.ifcbuf); 2747 for (i = 0, j = 0; 2748 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2749 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { 2750 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) 2751 return -EFAULT; 2752 ifr32++; 2753 ifr++; 2754 } 2755 2756 if (ifc32.ifcbuf == 0) { 2757 /* Translate from 64-bit structure multiple to 2758 * a 32-bit one. 2759 */ 2760 i = ifc.ifc_len; 2761 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2762 ifc32.ifc_len = i; 2763 } else { 2764 ifc32.ifc_len = i; 2765 } 2766 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2767 return -EFAULT; 2768 2769 return 0; 2770 } 2771 2772 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2773 { 2774 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2775 bool convert_in = false, convert_out = false; 2776 size_t buf_size = ALIGN(sizeof(struct ifreq), 8); 2777 struct ethtool_rxnfc __user *rxnfc; 2778 struct ifreq __user *ifr; 2779 u32 rule_cnt = 0, actual_rule_cnt; 2780 u32 ethcmd; 2781 u32 data; 2782 int ret; 2783 2784 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2785 return -EFAULT; 2786 2787 compat_rxnfc = compat_ptr(data); 2788 2789 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2790 return -EFAULT; 2791 2792 /* Most ethtool structures are defined without padding. 2793 * Unfortunately struct ethtool_rxnfc is an exception. 2794 */ 2795 switch (ethcmd) { 2796 default: 2797 break; 2798 case ETHTOOL_GRXCLSRLALL: 2799 /* Buffer size is variable */ 2800 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2801 return -EFAULT; 2802 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2803 return -ENOMEM; 2804 buf_size += rule_cnt * sizeof(u32); 2805 /* fall through */ 2806 case ETHTOOL_GRXRINGS: 2807 case ETHTOOL_GRXCLSRLCNT: 2808 case ETHTOOL_GRXCLSRULE: 2809 case ETHTOOL_SRXCLSRLINS: 2810 convert_out = true; 2811 /* fall through */ 2812 case ETHTOOL_SRXCLSRLDEL: 2813 buf_size += sizeof(struct ethtool_rxnfc); 2814 convert_in = true; 2815 break; 2816 } 2817 2818 ifr = compat_alloc_user_space(buf_size); 2819 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); 2820 2821 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2822 return -EFAULT; 2823 2824 if (put_user(convert_in ? rxnfc : compat_ptr(data), 2825 &ifr->ifr_ifru.ifru_data)) 2826 return -EFAULT; 2827 2828 if (convert_in) { 2829 /* We expect there to be holes between fs.m_ext and 2830 * fs.ring_cookie and at the end of fs, but nowhere else. 2831 */ 2832 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2833 sizeof(compat_rxnfc->fs.m_ext) != 2834 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2835 sizeof(rxnfc->fs.m_ext)); 2836 BUILD_BUG_ON( 2837 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2838 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2839 offsetof(struct ethtool_rxnfc, fs.location) - 2840 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2841 2842 if (copy_in_user(rxnfc, compat_rxnfc, 2843 (void __user *)(&rxnfc->fs.m_ext + 1) - 2844 (void __user *)rxnfc) || 2845 copy_in_user(&rxnfc->fs.ring_cookie, 2846 &compat_rxnfc->fs.ring_cookie, 2847 (void __user *)(&rxnfc->fs.location + 1) - 2848 (void __user *)&rxnfc->fs.ring_cookie) || 2849 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2850 sizeof(rxnfc->rule_cnt))) 2851 return -EFAULT; 2852 } 2853 2854 ret = dev_ioctl(net, SIOCETHTOOL, ifr); 2855 if (ret) 2856 return ret; 2857 2858 if (convert_out) { 2859 if (copy_in_user(compat_rxnfc, rxnfc, 2860 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2861 (const void __user *)rxnfc) || 2862 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2863 &rxnfc->fs.ring_cookie, 2864 (const void __user *)(&rxnfc->fs.location + 1) - 2865 (const void __user *)&rxnfc->fs.ring_cookie) || 2866 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2867 sizeof(rxnfc->rule_cnt))) 2868 return -EFAULT; 2869 2870 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2871 /* As an optimisation, we only copy the actual 2872 * number of rules that the underlying 2873 * function returned. Since Mallory might 2874 * change the rule count in user memory, we 2875 * check that it is less than the rule count 2876 * originally given (as the user buffer size), 2877 * which has been range-checked. 2878 */ 2879 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2880 return -EFAULT; 2881 if (actual_rule_cnt < rule_cnt) 2882 rule_cnt = actual_rule_cnt; 2883 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2884 &rxnfc->rule_locs[0], 2885 rule_cnt * sizeof(u32))) 2886 return -EFAULT; 2887 } 2888 } 2889 2890 return 0; 2891 } 2892 2893 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2894 { 2895 void __user *uptr; 2896 compat_uptr_t uptr32; 2897 struct ifreq __user *uifr; 2898 2899 uifr = compat_alloc_user_space(sizeof(*uifr)); 2900 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2901 return -EFAULT; 2902 2903 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2904 return -EFAULT; 2905 2906 uptr = compat_ptr(uptr32); 2907 2908 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2909 return -EFAULT; 2910 2911 return dev_ioctl(net, SIOCWANDEV, uifr); 2912 } 2913 2914 static int bond_ioctl(struct net *net, unsigned int cmd, 2915 struct compat_ifreq __user *ifr32) 2916 { 2917 struct ifreq kifr; 2918 mm_segment_t old_fs; 2919 int err; 2920 2921 switch (cmd) { 2922 case SIOCBONDENSLAVE: 2923 case SIOCBONDRELEASE: 2924 case SIOCBONDSETHWADDR: 2925 case SIOCBONDCHANGEACTIVE: 2926 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 2927 return -EFAULT; 2928 2929 old_fs = get_fs(); 2930 set_fs(KERNEL_DS); 2931 err = dev_ioctl(net, cmd, 2932 (struct ifreq __user __force *) &kifr); 2933 set_fs(old_fs); 2934 2935 return err; 2936 default: 2937 return -ENOIOCTLCMD; 2938 } 2939 } 2940 2941 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 2942 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 2943 struct compat_ifreq __user *u_ifreq32) 2944 { 2945 struct ifreq __user *u_ifreq64; 2946 char tmp_buf[IFNAMSIZ]; 2947 void __user *data64; 2948 u32 data32; 2949 2950 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 2951 IFNAMSIZ)) 2952 return -EFAULT; 2953 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 2954 return -EFAULT; 2955 data64 = compat_ptr(data32); 2956 2957 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 2958 2959 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 2960 IFNAMSIZ)) 2961 return -EFAULT; 2962 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 2963 return -EFAULT; 2964 2965 return dev_ioctl(net, cmd, u_ifreq64); 2966 } 2967 2968 static int dev_ifsioc(struct net *net, struct socket *sock, 2969 unsigned int cmd, struct compat_ifreq __user *uifr32) 2970 { 2971 struct ifreq __user *uifr; 2972 int err; 2973 2974 uifr = compat_alloc_user_space(sizeof(*uifr)); 2975 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 2976 return -EFAULT; 2977 2978 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 2979 2980 if (!err) { 2981 switch (cmd) { 2982 case SIOCGIFFLAGS: 2983 case SIOCGIFMETRIC: 2984 case SIOCGIFMTU: 2985 case SIOCGIFMEM: 2986 case SIOCGIFHWADDR: 2987 case SIOCGIFINDEX: 2988 case SIOCGIFADDR: 2989 case SIOCGIFBRDADDR: 2990 case SIOCGIFDSTADDR: 2991 case SIOCGIFNETMASK: 2992 case SIOCGIFPFLAGS: 2993 case SIOCGIFTXQLEN: 2994 case SIOCGMIIPHY: 2995 case SIOCGMIIREG: 2996 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 2997 err = -EFAULT; 2998 break; 2999 } 3000 } 3001 return err; 3002 } 3003 3004 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 3005 struct compat_ifreq __user *uifr32) 3006 { 3007 struct ifreq ifr; 3008 struct compat_ifmap __user *uifmap32; 3009 mm_segment_t old_fs; 3010 int err; 3011 3012 uifmap32 = &uifr32->ifr_ifru.ifru_map; 3013 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 3014 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3015 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3016 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3017 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 3018 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 3019 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 3020 if (err) 3021 return -EFAULT; 3022 3023 old_fs = get_fs(); 3024 set_fs(KERNEL_DS); 3025 err = dev_ioctl(net, cmd, (void __user __force *)&ifr); 3026 set_fs(old_fs); 3027 3028 if (cmd == SIOCGIFMAP && !err) { 3029 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3030 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3031 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3032 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3033 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3034 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3035 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3036 if (err) 3037 err = -EFAULT; 3038 } 3039 return err; 3040 } 3041 3042 struct rtentry32 { 3043 u32 rt_pad1; 3044 struct sockaddr rt_dst; /* target address */ 3045 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3046 struct sockaddr rt_genmask; /* target network mask (IP) */ 3047 unsigned short rt_flags; 3048 short rt_pad2; 3049 u32 rt_pad3; 3050 unsigned char rt_tos; 3051 unsigned char rt_class; 3052 short rt_pad4; 3053 short rt_metric; /* +1 for binary compatibility! */ 3054 /* char * */ u32 rt_dev; /* forcing the device at add */ 3055 u32 rt_mtu; /* per route MTU/Window */ 3056 u32 rt_window; /* Window clamping */ 3057 unsigned short rt_irtt; /* Initial RTT */ 3058 }; 3059 3060 struct in6_rtmsg32 { 3061 struct in6_addr rtmsg_dst; 3062 struct in6_addr rtmsg_src; 3063 struct in6_addr rtmsg_gateway; 3064 u32 rtmsg_type; 3065 u16 rtmsg_dst_len; 3066 u16 rtmsg_src_len; 3067 u32 rtmsg_metric; 3068 u32 rtmsg_info; 3069 u32 rtmsg_flags; 3070 s32 rtmsg_ifindex; 3071 }; 3072 3073 static int routing_ioctl(struct net *net, struct socket *sock, 3074 unsigned int cmd, void __user *argp) 3075 { 3076 int ret; 3077 void *r = NULL; 3078 struct in6_rtmsg r6; 3079 struct rtentry r4; 3080 char devname[16]; 3081 u32 rtdev; 3082 mm_segment_t old_fs = get_fs(); 3083 3084 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3085 struct in6_rtmsg32 __user *ur6 = argp; 3086 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3087 3 * sizeof(struct in6_addr)); 3088 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3089 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3090 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3091 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3092 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3093 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3094 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3095 3096 r = (void *) &r6; 3097 } else { /* ipv4 */ 3098 struct rtentry32 __user *ur4 = argp; 3099 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3100 3 * sizeof(struct sockaddr)); 3101 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3102 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3103 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3104 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3105 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3106 ret |= get_user(rtdev, &(ur4->rt_dev)); 3107 if (rtdev) { 3108 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3109 r4.rt_dev = (char __user __force *)devname; 3110 devname[15] = 0; 3111 } else 3112 r4.rt_dev = NULL; 3113 3114 r = (void *) &r4; 3115 } 3116 3117 if (ret) { 3118 ret = -EFAULT; 3119 goto out; 3120 } 3121 3122 set_fs(KERNEL_DS); 3123 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3124 set_fs(old_fs); 3125 3126 out: 3127 return ret; 3128 } 3129 3130 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3131 * for some operations; this forces use of the newer bridge-utils that 3132 * use compatible ioctls 3133 */ 3134 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3135 { 3136 compat_ulong_t tmp; 3137 3138 if (get_user(tmp, argp)) 3139 return -EFAULT; 3140 if (tmp == BRCTL_GET_VERSION) 3141 return BRCTL_VERSION + 1; 3142 return -EINVAL; 3143 } 3144 3145 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3146 unsigned int cmd, unsigned long arg) 3147 { 3148 void __user *argp = compat_ptr(arg); 3149 struct sock *sk = sock->sk; 3150 struct net *net = sock_net(sk); 3151 3152 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3153 return compat_ifr_data_ioctl(net, cmd, argp); 3154 3155 switch (cmd) { 3156 case SIOCSIFBR: 3157 case SIOCGIFBR: 3158 return old_bridge_ioctl(argp); 3159 case SIOCGIFNAME: 3160 return dev_ifname32(net, argp); 3161 case SIOCGIFCONF: 3162 return dev_ifconf(net, argp); 3163 case SIOCETHTOOL: 3164 return ethtool_ioctl(net, argp); 3165 case SIOCWANDEV: 3166 return compat_siocwandev(net, argp); 3167 case SIOCGIFMAP: 3168 case SIOCSIFMAP: 3169 return compat_sioc_ifmap(net, cmd, argp); 3170 case SIOCBONDENSLAVE: 3171 case SIOCBONDRELEASE: 3172 case SIOCBONDSETHWADDR: 3173 case SIOCBONDCHANGEACTIVE: 3174 return bond_ioctl(net, cmd, argp); 3175 case SIOCADDRT: 3176 case SIOCDELRT: 3177 return routing_ioctl(net, sock, cmd, argp); 3178 case SIOCGSTAMP: 3179 return do_siocgstamp(net, sock, cmd, argp); 3180 case SIOCGSTAMPNS: 3181 return do_siocgstampns(net, sock, cmd, argp); 3182 case SIOCBONDSLAVEINFOQUERY: 3183 case SIOCBONDINFOQUERY: 3184 case SIOCSHWTSTAMP: 3185 case SIOCGHWTSTAMP: 3186 return compat_ifr_data_ioctl(net, cmd, argp); 3187 3188 case FIOSETOWN: 3189 case SIOCSPGRP: 3190 case FIOGETOWN: 3191 case SIOCGPGRP: 3192 case SIOCBRADDBR: 3193 case SIOCBRDELBR: 3194 case SIOCGIFVLAN: 3195 case SIOCSIFVLAN: 3196 case SIOCADDDLCI: 3197 case SIOCDELDLCI: 3198 case SIOCGSKNS: 3199 return sock_ioctl(file, cmd, arg); 3200 3201 case SIOCGIFFLAGS: 3202 case SIOCSIFFLAGS: 3203 case SIOCGIFMETRIC: 3204 case SIOCSIFMETRIC: 3205 case SIOCGIFMTU: 3206 case SIOCSIFMTU: 3207 case SIOCGIFMEM: 3208 case SIOCSIFMEM: 3209 case SIOCGIFHWADDR: 3210 case SIOCSIFHWADDR: 3211 case SIOCADDMULTI: 3212 case SIOCDELMULTI: 3213 case SIOCGIFINDEX: 3214 case SIOCGIFADDR: 3215 case SIOCSIFADDR: 3216 case SIOCSIFHWBROADCAST: 3217 case SIOCDIFADDR: 3218 case SIOCGIFBRDADDR: 3219 case SIOCSIFBRDADDR: 3220 case SIOCGIFDSTADDR: 3221 case SIOCSIFDSTADDR: 3222 case SIOCGIFNETMASK: 3223 case SIOCSIFNETMASK: 3224 case SIOCSIFPFLAGS: 3225 case SIOCGIFPFLAGS: 3226 case SIOCGIFTXQLEN: 3227 case SIOCSIFTXQLEN: 3228 case SIOCBRADDIF: 3229 case SIOCBRDELIF: 3230 case SIOCSIFNAME: 3231 case SIOCGMIIPHY: 3232 case SIOCGMIIREG: 3233 case SIOCSMIIREG: 3234 return dev_ifsioc(net, sock, cmd, argp); 3235 3236 case SIOCSARP: 3237 case SIOCGARP: 3238 case SIOCDARP: 3239 case SIOCATMARK: 3240 return sock_do_ioctl(net, sock, cmd, arg); 3241 } 3242 3243 return -ENOIOCTLCMD; 3244 } 3245 3246 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3247 unsigned long arg) 3248 { 3249 struct socket *sock = file->private_data; 3250 int ret = -ENOIOCTLCMD; 3251 struct sock *sk; 3252 struct net *net; 3253 3254 sk = sock->sk; 3255 net = sock_net(sk); 3256 3257 if (sock->ops->compat_ioctl) 3258 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3259 3260 if (ret == -ENOIOCTLCMD && 3261 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3262 ret = compat_wext_handle_ioctl(net, cmd, arg); 3263 3264 if (ret == -ENOIOCTLCMD) 3265 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3266 3267 return ret; 3268 } 3269 #endif 3270 3271 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3272 { 3273 return sock->ops->bind(sock, addr, addrlen); 3274 } 3275 EXPORT_SYMBOL(kernel_bind); 3276 3277 int kernel_listen(struct socket *sock, int backlog) 3278 { 3279 return sock->ops->listen(sock, backlog); 3280 } 3281 EXPORT_SYMBOL(kernel_listen); 3282 3283 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3284 { 3285 struct sock *sk = sock->sk; 3286 int err; 3287 3288 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3289 newsock); 3290 if (err < 0) 3291 goto done; 3292 3293 err = sock->ops->accept(sock, *newsock, flags, true); 3294 if (err < 0) { 3295 sock_release(*newsock); 3296 *newsock = NULL; 3297 goto done; 3298 } 3299 3300 (*newsock)->ops = sock->ops; 3301 __module_get((*newsock)->ops->owner); 3302 3303 done: 3304 return err; 3305 } 3306 EXPORT_SYMBOL(kernel_accept); 3307 3308 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3309 int flags) 3310 { 3311 return sock->ops->connect(sock, addr, addrlen, flags); 3312 } 3313 EXPORT_SYMBOL(kernel_connect); 3314 3315 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3316 int *addrlen) 3317 { 3318 return sock->ops->getname(sock, addr, addrlen, 0); 3319 } 3320 EXPORT_SYMBOL(kernel_getsockname); 3321 3322 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3323 int *addrlen) 3324 { 3325 return sock->ops->getname(sock, addr, addrlen, 1); 3326 } 3327 EXPORT_SYMBOL(kernel_getpeername); 3328 3329 int kernel_getsockopt(struct socket *sock, int level, int optname, 3330 char *optval, int *optlen) 3331 { 3332 mm_segment_t oldfs = get_fs(); 3333 char __user *uoptval; 3334 int __user *uoptlen; 3335 int err; 3336 3337 uoptval = (char __user __force *) optval; 3338 uoptlen = (int __user __force *) optlen; 3339 3340 set_fs(KERNEL_DS); 3341 if (level == SOL_SOCKET) 3342 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3343 else 3344 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3345 uoptlen); 3346 set_fs(oldfs); 3347 return err; 3348 } 3349 EXPORT_SYMBOL(kernel_getsockopt); 3350 3351 int kernel_setsockopt(struct socket *sock, int level, int optname, 3352 char *optval, unsigned int optlen) 3353 { 3354 mm_segment_t oldfs = get_fs(); 3355 char __user *uoptval; 3356 int err; 3357 3358 uoptval = (char __user __force *) optval; 3359 3360 set_fs(KERNEL_DS); 3361 if (level == SOL_SOCKET) 3362 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3363 else 3364 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3365 optlen); 3366 set_fs(oldfs); 3367 return err; 3368 } 3369 EXPORT_SYMBOL(kernel_setsockopt); 3370 3371 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3372 size_t size, int flags) 3373 { 3374 if (sock->ops->sendpage) 3375 return sock->ops->sendpage(sock, page, offset, size, flags); 3376 3377 return sock_no_sendpage(sock, page, offset, size, flags); 3378 } 3379 EXPORT_SYMBOL(kernel_sendpage); 3380 3381 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3382 size_t size, int flags) 3383 { 3384 struct socket *sock = sk->sk_socket; 3385 3386 if (sock->ops->sendpage_locked) 3387 return sock->ops->sendpage_locked(sk, page, offset, size, 3388 flags); 3389 3390 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3391 } 3392 EXPORT_SYMBOL(kernel_sendpage_locked); 3393 3394 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3395 { 3396 mm_segment_t oldfs = get_fs(); 3397 int err; 3398 3399 set_fs(KERNEL_DS); 3400 err = sock->ops->ioctl(sock, cmd, arg); 3401 set_fs(oldfs); 3402 3403 return err; 3404 } 3405 EXPORT_SYMBOL(kernel_sock_ioctl); 3406 3407 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3408 { 3409 return sock->ops->shutdown(sock, how); 3410 } 3411 EXPORT_SYMBOL(kernel_sock_shutdown); 3412 3413 /* This routine returns the IP overhead imposed by a socket i.e. 3414 * the length of the underlying IP header, depending on whether 3415 * this is an IPv4 or IPv6 socket and the length from IP options turned 3416 * on at the socket. Assumes that the caller has a lock on the socket. 3417 */ 3418 u32 kernel_sock_ip_overhead(struct sock *sk) 3419 { 3420 struct inet_sock *inet; 3421 struct ip_options_rcu *opt; 3422 u32 overhead = 0; 3423 #if IS_ENABLED(CONFIG_IPV6) 3424 struct ipv6_pinfo *np; 3425 struct ipv6_txoptions *optv6 = NULL; 3426 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3427 3428 if (!sk) 3429 return overhead; 3430 3431 switch (sk->sk_family) { 3432 case AF_INET: 3433 inet = inet_sk(sk); 3434 overhead += sizeof(struct iphdr); 3435 opt = rcu_dereference_protected(inet->inet_opt, 3436 sock_owned_by_user(sk)); 3437 if (opt) 3438 overhead += opt->opt.optlen; 3439 return overhead; 3440 #if IS_ENABLED(CONFIG_IPV6) 3441 case AF_INET6: 3442 np = inet6_sk(sk); 3443 overhead += sizeof(struct ipv6hdr); 3444 if (np) 3445 optv6 = rcu_dereference_protected(np->opt, 3446 sock_owned_by_user(sk)); 3447 if (optv6) 3448 overhead += (optv6->opt_flen + optv6->opt_nflen); 3449 return overhead; 3450 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3451 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3452 return overhead; 3453 } 3454 } 3455 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3456