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 #include <linux/nospec.h> 93 94 #include <linux/uaccess.h> 95 #include <asm/unistd.h> 96 97 #include <net/compat.h> 98 #include <net/wext.h> 99 #include <net/cls_cgroup.h> 100 101 #include <net/sock.h> 102 #include <linux/netfilter.h> 103 104 #include <linux/if_tun.h> 105 #include <linux/ipv6_route.h> 106 #include <linux/route.h> 107 #include <linux/sockios.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 __poll_t 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 * Support routines. 167 * Move socket addresses back and forth across the kernel/user 168 * divide and look after the messy bits. 169 */ 170 171 /** 172 * move_addr_to_kernel - copy a socket address into kernel space 173 * @uaddr: Address in user space 174 * @kaddr: Address in kernel space 175 * @ulen: Length in user space 176 * 177 * The address is copied into kernel space. If the provided address is 178 * too long an error code of -EINVAL is returned. If the copy gives 179 * invalid addresses -EFAULT is returned. On a success 0 is returned. 180 */ 181 182 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 183 { 184 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 185 return -EINVAL; 186 if (ulen == 0) 187 return 0; 188 if (copy_from_user(kaddr, uaddr, ulen)) 189 return -EFAULT; 190 return audit_sockaddr(ulen, kaddr); 191 } 192 193 /** 194 * move_addr_to_user - copy an address to user space 195 * @kaddr: kernel space address 196 * @klen: length of address in kernel 197 * @uaddr: user space address 198 * @ulen: pointer to user length field 199 * 200 * The value pointed to by ulen on entry is the buffer length available. 201 * This is overwritten with the buffer space used. -EINVAL is returned 202 * if an overlong buffer is specified or a negative buffer size. -EFAULT 203 * is returned if either the buffer or the length field are not 204 * accessible. 205 * After copying the data up to the limit the user specifies, the true 206 * length of the data is written over the length limit the user 207 * specified. Zero is returned for a success. 208 */ 209 210 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 211 void __user *uaddr, int __user *ulen) 212 { 213 int err; 214 int len; 215 216 BUG_ON(klen > sizeof(struct sockaddr_storage)); 217 err = get_user(len, ulen); 218 if (err) 219 return err; 220 if (len > klen) 221 len = klen; 222 if (len < 0) 223 return -EINVAL; 224 if (len) { 225 if (audit_sockaddr(klen, kaddr)) 226 return -ENOMEM; 227 if (copy_to_user(uaddr, kaddr, len)) 228 return -EFAULT; 229 } 230 /* 231 * "fromlen shall refer to the value before truncation.." 232 * 1003.1g 233 */ 234 return __put_user(klen, ulen); 235 } 236 237 static struct kmem_cache *sock_inode_cachep __ro_after_init; 238 239 static struct inode *sock_alloc_inode(struct super_block *sb) 240 { 241 struct socket_alloc *ei; 242 struct socket_wq *wq; 243 244 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 245 if (!ei) 246 return NULL; 247 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 248 if (!wq) { 249 kmem_cache_free(sock_inode_cachep, ei); 250 return NULL; 251 } 252 init_waitqueue_head(&wq->wait); 253 wq->fasync_list = NULL; 254 wq->flags = 0; 255 ei->socket.wq = wq; 256 257 ei->socket.state = SS_UNCONNECTED; 258 ei->socket.flags = 0; 259 ei->socket.ops = NULL; 260 ei->socket.sk = NULL; 261 ei->socket.file = NULL; 262 263 return &ei->vfs_inode; 264 } 265 266 static void sock_destroy_inode(struct inode *inode) 267 { 268 struct socket_alloc *ei; 269 270 ei = container_of(inode, struct socket_alloc, vfs_inode); 271 kfree_rcu(ei->socket.wq, rcu); 272 kmem_cache_free(sock_inode_cachep, ei); 273 } 274 275 static void init_once(void *foo) 276 { 277 struct socket_alloc *ei = (struct socket_alloc *)foo; 278 279 inode_init_once(&ei->vfs_inode); 280 } 281 282 static void init_inodecache(void) 283 { 284 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 285 sizeof(struct socket_alloc), 286 0, 287 (SLAB_HWCACHE_ALIGN | 288 SLAB_RECLAIM_ACCOUNT | 289 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 290 init_once); 291 BUG_ON(sock_inode_cachep == NULL); 292 } 293 294 static const struct super_operations sockfs_ops = { 295 .alloc_inode = sock_alloc_inode, 296 .destroy_inode = sock_destroy_inode, 297 .statfs = simple_statfs, 298 }; 299 300 /* 301 * sockfs_dname() is called from d_path(). 302 */ 303 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 304 { 305 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 306 d_inode(dentry)->i_ino); 307 } 308 309 static const struct dentry_operations sockfs_dentry_operations = { 310 .d_dname = sockfs_dname, 311 }; 312 313 static int sockfs_xattr_get(const struct xattr_handler *handler, 314 struct dentry *dentry, struct inode *inode, 315 const char *suffix, void *value, size_t size) 316 { 317 if (value) { 318 if (dentry->d_name.len + 1 > size) 319 return -ERANGE; 320 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 321 } 322 return dentry->d_name.len + 1; 323 } 324 325 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 326 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 327 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 328 329 static const struct xattr_handler sockfs_xattr_handler = { 330 .name = XATTR_NAME_SOCKPROTONAME, 331 .get = sockfs_xattr_get, 332 }; 333 334 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 335 struct dentry *dentry, struct inode *inode, 336 const char *suffix, const void *value, 337 size_t size, int flags) 338 { 339 /* Handled by LSM. */ 340 return -EAGAIN; 341 } 342 343 static const struct xattr_handler sockfs_security_xattr_handler = { 344 .prefix = XATTR_SECURITY_PREFIX, 345 .set = sockfs_security_xattr_set, 346 }; 347 348 static const struct xattr_handler *sockfs_xattr_handlers[] = { 349 &sockfs_xattr_handler, 350 &sockfs_security_xattr_handler, 351 NULL 352 }; 353 354 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 355 int flags, const char *dev_name, void *data) 356 { 357 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 358 sockfs_xattr_handlers, 359 &sockfs_dentry_operations, SOCKFS_MAGIC); 360 } 361 362 static struct vfsmount *sock_mnt __read_mostly; 363 364 static struct file_system_type sock_fs_type = { 365 .name = "sockfs", 366 .mount = sockfs_mount, 367 .kill_sb = kill_anon_super, 368 }; 369 370 /* 371 * Obtains the first available file descriptor and sets it up for use. 372 * 373 * These functions create file structures and maps them to fd space 374 * of the current process. On success it returns file descriptor 375 * and file struct implicitly stored in sock->file. 376 * Note that another thread may close file descriptor before we return 377 * from this function. We use the fact that now we do not refer 378 * to socket after mapping. If one day we will need it, this 379 * function will increment ref. count on file by 1. 380 * 381 * In any case returned fd MAY BE not valid! 382 * This race condition is unavoidable 383 * with shared fd spaces, we cannot solve it inside kernel, 384 * but we take care of internal coherence yet. 385 */ 386 387 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 388 { 389 struct file *file; 390 391 if (!dname) 392 dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; 393 394 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, 395 O_RDWR | (flags & O_NONBLOCK), 396 &socket_file_ops); 397 if (IS_ERR(file)) { 398 sock_release(sock); 399 return file; 400 } 401 402 sock->file = file; 403 file->private_data = sock; 404 return file; 405 } 406 EXPORT_SYMBOL(sock_alloc_file); 407 408 static int sock_map_fd(struct socket *sock, int flags) 409 { 410 struct file *newfile; 411 int fd = get_unused_fd_flags(flags); 412 if (unlikely(fd < 0)) { 413 sock_release(sock); 414 return fd; 415 } 416 417 newfile = sock_alloc_file(sock, flags, NULL); 418 if (likely(!IS_ERR(newfile))) { 419 fd_install(fd, newfile); 420 return fd; 421 } 422 423 put_unused_fd(fd); 424 return PTR_ERR(newfile); 425 } 426 427 struct socket *sock_from_file(struct file *file, int *err) 428 { 429 if (file->f_op == &socket_file_ops) 430 return file->private_data; /* set in sock_map_fd */ 431 432 *err = -ENOTSOCK; 433 return NULL; 434 } 435 EXPORT_SYMBOL(sock_from_file); 436 437 /** 438 * sockfd_lookup - Go from a file number to its socket slot 439 * @fd: file handle 440 * @err: pointer to an error code return 441 * 442 * The file handle passed in is locked and the socket it is bound 443 * to is returned. If an error occurs the err pointer is overwritten 444 * with a negative errno code and NULL is returned. The function checks 445 * for both invalid handles and passing a handle which is not a socket. 446 * 447 * On a success the socket object pointer is returned. 448 */ 449 450 struct socket *sockfd_lookup(int fd, int *err) 451 { 452 struct file *file; 453 struct socket *sock; 454 455 file = fget(fd); 456 if (!file) { 457 *err = -EBADF; 458 return NULL; 459 } 460 461 sock = sock_from_file(file, err); 462 if (!sock) 463 fput(file); 464 return sock; 465 } 466 EXPORT_SYMBOL(sockfd_lookup); 467 468 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 469 { 470 struct fd f = fdget(fd); 471 struct socket *sock; 472 473 *err = -EBADF; 474 if (f.file) { 475 sock = sock_from_file(f.file, err); 476 if (likely(sock)) { 477 *fput_needed = f.flags; 478 return sock; 479 } 480 fdput(f); 481 } 482 return NULL; 483 } 484 485 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 486 size_t size) 487 { 488 ssize_t len; 489 ssize_t used = 0; 490 491 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 492 if (len < 0) 493 return len; 494 used += len; 495 if (buffer) { 496 if (size < used) 497 return -ERANGE; 498 buffer += len; 499 } 500 501 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 502 used += len; 503 if (buffer) { 504 if (size < used) 505 return -ERANGE; 506 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 507 buffer += len; 508 } 509 510 return used; 511 } 512 513 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 514 { 515 int err = simple_setattr(dentry, iattr); 516 517 if (!err && (iattr->ia_valid & ATTR_UID)) { 518 struct socket *sock = SOCKET_I(d_inode(dentry)); 519 520 if (sock->sk) 521 sock->sk->sk_uid = iattr->ia_uid; 522 else 523 err = -ENOENT; 524 } 525 526 return err; 527 } 528 529 static const struct inode_operations sockfs_inode_ops = { 530 .listxattr = sockfs_listxattr, 531 .setattr = sockfs_setattr, 532 }; 533 534 /** 535 * sock_alloc - allocate a socket 536 * 537 * Allocate a new inode and socket object. The two are bound together 538 * and initialised. The socket is then returned. If we are out of inodes 539 * NULL is returned. 540 */ 541 542 struct socket *sock_alloc(void) 543 { 544 struct inode *inode; 545 struct socket *sock; 546 547 inode = new_inode_pseudo(sock_mnt->mnt_sb); 548 if (!inode) 549 return NULL; 550 551 sock = SOCKET_I(inode); 552 553 inode->i_ino = get_next_ino(); 554 inode->i_mode = S_IFSOCK | S_IRWXUGO; 555 inode->i_uid = current_fsuid(); 556 inode->i_gid = current_fsgid(); 557 inode->i_op = &sockfs_inode_ops; 558 559 return sock; 560 } 561 EXPORT_SYMBOL(sock_alloc); 562 563 /** 564 * sock_release - close a socket 565 * @sock: socket to close 566 * 567 * The socket is released from the protocol stack if it has a release 568 * callback, and the inode is then released if the socket is bound to 569 * an inode not a file. 570 */ 571 572 static void __sock_release(struct socket *sock, struct inode *inode) 573 { 574 if (sock->ops) { 575 struct module *owner = sock->ops->owner; 576 577 if (inode) 578 inode_lock(inode); 579 sock->ops->release(sock); 580 if (inode) 581 inode_unlock(inode); 582 sock->ops = NULL; 583 module_put(owner); 584 } 585 586 if (sock->wq->fasync_list) 587 pr_err("%s: fasync list not empty!\n", __func__); 588 589 if (!sock->file) { 590 iput(SOCK_INODE(sock)); 591 return; 592 } 593 sock->file = NULL; 594 } 595 596 void sock_release(struct socket *sock) 597 { 598 __sock_release(sock, NULL); 599 } 600 EXPORT_SYMBOL(sock_release); 601 602 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 603 { 604 u8 flags = *tx_flags; 605 606 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 607 flags |= SKBTX_HW_TSTAMP; 608 609 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 610 flags |= SKBTX_SW_TSTAMP; 611 612 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 613 flags |= SKBTX_SCHED_TSTAMP; 614 615 *tx_flags = flags; 616 } 617 EXPORT_SYMBOL(__sock_tx_timestamp); 618 619 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 620 { 621 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 622 BUG_ON(ret == -EIOCBQUEUED); 623 return ret; 624 } 625 626 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 627 { 628 int err = security_socket_sendmsg(sock, msg, 629 msg_data_left(msg)); 630 631 return err ?: sock_sendmsg_nosec(sock, msg); 632 } 633 EXPORT_SYMBOL(sock_sendmsg); 634 635 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 636 struct kvec *vec, size_t num, size_t size) 637 { 638 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 639 return sock_sendmsg(sock, msg); 640 } 641 EXPORT_SYMBOL(kernel_sendmsg); 642 643 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 644 struct kvec *vec, size_t num, size_t size) 645 { 646 struct socket *sock = sk->sk_socket; 647 648 if (!sock->ops->sendmsg_locked) 649 return sock_no_sendmsg_locked(sk, msg, size); 650 651 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 652 653 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 654 } 655 EXPORT_SYMBOL(kernel_sendmsg_locked); 656 657 static bool skb_is_err_queue(const struct sk_buff *skb) 658 { 659 /* pkt_type of skbs enqueued on the error queue are set to 660 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 661 * in recvmsg, since skbs received on a local socket will never 662 * have a pkt_type of PACKET_OUTGOING. 663 */ 664 return skb->pkt_type == PACKET_OUTGOING; 665 } 666 667 /* On transmit, software and hardware timestamps are returned independently. 668 * As the two skb clones share the hardware timestamp, which may be updated 669 * before the software timestamp is received, a hardware TX timestamp may be 670 * returned only if there is no software TX timestamp. Ignore false software 671 * timestamps, which may be made in the __sock_recv_timestamp() call when the 672 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a 673 * hardware timestamp. 674 */ 675 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 676 { 677 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 678 } 679 680 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 681 { 682 struct scm_ts_pktinfo ts_pktinfo; 683 struct net_device *orig_dev; 684 685 if (!skb_mac_header_was_set(skb)) 686 return; 687 688 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 689 690 rcu_read_lock(); 691 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 692 if (orig_dev) 693 ts_pktinfo.if_index = orig_dev->ifindex; 694 rcu_read_unlock(); 695 696 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 697 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 698 sizeof(ts_pktinfo), &ts_pktinfo); 699 } 700 701 /* 702 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 703 */ 704 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 705 struct sk_buff *skb) 706 { 707 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 708 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); 709 struct scm_timestamping tss; 710 int empty = 1, false_tstamp = 0; 711 struct skb_shared_hwtstamps *shhwtstamps = 712 skb_hwtstamps(skb); 713 714 /* Race occurred between timestamp enabling and packet 715 receiving. Fill in the current time for now. */ 716 if (need_software_tstamp && skb->tstamp == 0) { 717 __net_timestamp(skb); 718 false_tstamp = 1; 719 } 720 721 if (need_software_tstamp) { 722 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 723 if (new_tstamp) { 724 struct __kernel_sock_timeval tv; 725 726 skb_get_new_timestamp(skb, &tv); 727 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, 728 sizeof(tv), &tv); 729 } else { 730 struct __kernel_old_timeval tv; 731 732 skb_get_timestamp(skb, &tv); 733 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, 734 sizeof(tv), &tv); 735 } 736 } else { 737 if (new_tstamp) { 738 struct __kernel_timespec ts; 739 740 skb_get_new_timestampns(skb, &ts); 741 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, 742 sizeof(ts), &ts); 743 } else { 744 struct timespec ts; 745 746 skb_get_timestampns(skb, &ts); 747 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, 748 sizeof(ts), &ts); 749 } 750 } 751 } 752 753 memset(&tss, 0, sizeof(tss)); 754 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 755 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 756 empty = 0; 757 if (shhwtstamps && 758 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 759 !skb_is_swtx_tstamp(skb, false_tstamp) && 760 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 761 empty = 0; 762 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 763 !skb_is_err_queue(skb)) 764 put_ts_pktinfo(msg, skb); 765 } 766 if (!empty) { 767 put_cmsg(msg, SOL_SOCKET, 768 SO_TIMESTAMPING_OLD, sizeof(tss), &tss); 769 770 if (skb_is_err_queue(skb) && skb->len && 771 SKB_EXT_ERR(skb)->opt_stats) 772 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 773 skb->len, skb->data); 774 } 775 } 776 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 777 778 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 779 struct sk_buff *skb) 780 { 781 int ack; 782 783 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 784 return; 785 if (!skb->wifi_acked_valid) 786 return; 787 788 ack = skb->wifi_acked; 789 790 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 791 } 792 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 793 794 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 795 struct sk_buff *skb) 796 { 797 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 798 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 799 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 800 } 801 802 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 803 struct sk_buff *skb) 804 { 805 sock_recv_timestamp(msg, sk, skb); 806 sock_recv_drops(msg, sk, skb); 807 } 808 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 809 810 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 811 int flags) 812 { 813 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 814 } 815 816 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 817 { 818 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 819 820 return err ?: sock_recvmsg_nosec(sock, msg, flags); 821 } 822 EXPORT_SYMBOL(sock_recvmsg); 823 824 /** 825 * kernel_recvmsg - Receive a message from a socket (kernel space) 826 * @sock: The socket to receive the message from 827 * @msg: Received message 828 * @vec: Input s/g array for message data 829 * @num: Size of input s/g array 830 * @size: Number of bytes to read 831 * @flags: Message flags (MSG_DONTWAIT, etc...) 832 * 833 * On return the msg structure contains the scatter/gather array passed in the 834 * vec argument. The array is modified so that it consists of the unfilled 835 * portion of the original array. 836 * 837 * The returned value is the total number of bytes received, or an error. 838 */ 839 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 840 struct kvec *vec, size_t num, size_t size, int flags) 841 { 842 mm_segment_t oldfs = get_fs(); 843 int result; 844 845 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); 846 set_fs(KERNEL_DS); 847 result = sock_recvmsg(sock, msg, flags); 848 set_fs(oldfs); 849 return result; 850 } 851 EXPORT_SYMBOL(kernel_recvmsg); 852 853 static ssize_t sock_sendpage(struct file *file, struct page *page, 854 int offset, size_t size, loff_t *ppos, int more) 855 { 856 struct socket *sock; 857 int flags; 858 859 sock = file->private_data; 860 861 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 862 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 863 flags |= more; 864 865 return kernel_sendpage(sock, page, offset, size, flags); 866 } 867 868 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 869 struct pipe_inode_info *pipe, size_t len, 870 unsigned int flags) 871 { 872 struct socket *sock = file->private_data; 873 874 if (unlikely(!sock->ops->splice_read)) 875 return generic_file_splice_read(file, ppos, pipe, len, flags); 876 877 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 878 } 879 880 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 881 { 882 struct file *file = iocb->ki_filp; 883 struct socket *sock = file->private_data; 884 struct msghdr msg = {.msg_iter = *to, 885 .msg_iocb = iocb}; 886 ssize_t res; 887 888 if (file->f_flags & O_NONBLOCK) 889 msg.msg_flags = MSG_DONTWAIT; 890 891 if (iocb->ki_pos != 0) 892 return -ESPIPE; 893 894 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 895 return 0; 896 897 res = sock_recvmsg(sock, &msg, msg.msg_flags); 898 *to = msg.msg_iter; 899 return res; 900 } 901 902 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 903 { 904 struct file *file = iocb->ki_filp; 905 struct socket *sock = file->private_data; 906 struct msghdr msg = {.msg_iter = *from, 907 .msg_iocb = iocb}; 908 ssize_t res; 909 910 if (iocb->ki_pos != 0) 911 return -ESPIPE; 912 913 if (file->f_flags & O_NONBLOCK) 914 msg.msg_flags = MSG_DONTWAIT; 915 916 if (sock->type == SOCK_SEQPACKET) 917 msg.msg_flags |= MSG_EOR; 918 919 res = sock_sendmsg(sock, &msg); 920 *from = msg.msg_iter; 921 return res; 922 } 923 924 /* 925 * Atomic setting of ioctl hooks to avoid race 926 * with module unload. 927 */ 928 929 static DEFINE_MUTEX(br_ioctl_mutex); 930 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 931 932 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 933 { 934 mutex_lock(&br_ioctl_mutex); 935 br_ioctl_hook = hook; 936 mutex_unlock(&br_ioctl_mutex); 937 } 938 EXPORT_SYMBOL(brioctl_set); 939 940 static DEFINE_MUTEX(vlan_ioctl_mutex); 941 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 942 943 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 944 { 945 mutex_lock(&vlan_ioctl_mutex); 946 vlan_ioctl_hook = hook; 947 mutex_unlock(&vlan_ioctl_mutex); 948 } 949 EXPORT_SYMBOL(vlan_ioctl_set); 950 951 static DEFINE_MUTEX(dlci_ioctl_mutex); 952 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 953 954 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 955 { 956 mutex_lock(&dlci_ioctl_mutex); 957 dlci_ioctl_hook = hook; 958 mutex_unlock(&dlci_ioctl_mutex); 959 } 960 EXPORT_SYMBOL(dlci_ioctl_set); 961 962 static long sock_do_ioctl(struct net *net, struct socket *sock, 963 unsigned int cmd, unsigned long arg, 964 unsigned int ifreq_size) 965 { 966 int err; 967 void __user *argp = (void __user *)arg; 968 969 err = sock->ops->ioctl(sock, cmd, arg); 970 971 /* 972 * If this ioctl is unknown try to hand it down 973 * to the NIC driver. 974 */ 975 if (err != -ENOIOCTLCMD) 976 return err; 977 978 if (cmd == SIOCGIFCONF) { 979 struct ifconf ifc; 980 if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) 981 return -EFAULT; 982 rtnl_lock(); 983 err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); 984 rtnl_unlock(); 985 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) 986 err = -EFAULT; 987 } else { 988 struct ifreq ifr; 989 bool need_copyout; 990 if (copy_from_user(&ifr, argp, ifreq_size)) 991 return -EFAULT; 992 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 993 if (!err && need_copyout) 994 if (copy_to_user(argp, &ifr, ifreq_size)) 995 return -EFAULT; 996 } 997 return err; 998 } 999 1000 /* 1001 * With an ioctl, arg may well be a user mode pointer, but we don't know 1002 * what to do with it - that's up to the protocol still. 1003 */ 1004 1005 struct ns_common *get_net_ns(struct ns_common *ns) 1006 { 1007 return &get_net(container_of(ns, struct net, ns))->ns; 1008 } 1009 EXPORT_SYMBOL_GPL(get_net_ns); 1010 1011 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 1012 { 1013 struct socket *sock; 1014 struct sock *sk; 1015 void __user *argp = (void __user *)arg; 1016 int pid, err; 1017 struct net *net; 1018 1019 sock = file->private_data; 1020 sk = sock->sk; 1021 net = sock_net(sk); 1022 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { 1023 struct ifreq ifr; 1024 bool need_copyout; 1025 if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 1026 return -EFAULT; 1027 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 1028 if (!err && need_copyout) 1029 if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 1030 return -EFAULT; 1031 } else 1032 #ifdef CONFIG_WEXT_CORE 1033 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1034 err = wext_handle_ioctl(net, cmd, argp); 1035 } else 1036 #endif 1037 switch (cmd) { 1038 case FIOSETOWN: 1039 case SIOCSPGRP: 1040 err = -EFAULT; 1041 if (get_user(pid, (int __user *)argp)) 1042 break; 1043 err = f_setown(sock->file, pid, 1); 1044 break; 1045 case FIOGETOWN: 1046 case SIOCGPGRP: 1047 err = put_user(f_getown(sock->file), 1048 (int __user *)argp); 1049 break; 1050 case SIOCGIFBR: 1051 case SIOCSIFBR: 1052 case SIOCBRADDBR: 1053 case SIOCBRDELBR: 1054 err = -ENOPKG; 1055 if (!br_ioctl_hook) 1056 request_module("bridge"); 1057 1058 mutex_lock(&br_ioctl_mutex); 1059 if (br_ioctl_hook) 1060 err = br_ioctl_hook(net, cmd, argp); 1061 mutex_unlock(&br_ioctl_mutex); 1062 break; 1063 case SIOCGIFVLAN: 1064 case SIOCSIFVLAN: 1065 err = -ENOPKG; 1066 if (!vlan_ioctl_hook) 1067 request_module("8021q"); 1068 1069 mutex_lock(&vlan_ioctl_mutex); 1070 if (vlan_ioctl_hook) 1071 err = vlan_ioctl_hook(net, argp); 1072 mutex_unlock(&vlan_ioctl_mutex); 1073 break; 1074 case SIOCADDDLCI: 1075 case SIOCDELDLCI: 1076 err = -ENOPKG; 1077 if (!dlci_ioctl_hook) 1078 request_module("dlci"); 1079 1080 mutex_lock(&dlci_ioctl_mutex); 1081 if (dlci_ioctl_hook) 1082 err = dlci_ioctl_hook(cmd, argp); 1083 mutex_unlock(&dlci_ioctl_mutex); 1084 break; 1085 case SIOCGSKNS: 1086 err = -EPERM; 1087 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1088 break; 1089 1090 err = open_related_ns(&net->ns, get_net_ns); 1091 break; 1092 default: 1093 err = sock_do_ioctl(net, sock, cmd, arg, 1094 sizeof(struct ifreq)); 1095 break; 1096 } 1097 return err; 1098 } 1099 1100 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1101 { 1102 int err; 1103 struct socket *sock = NULL; 1104 1105 err = security_socket_create(family, type, protocol, 1); 1106 if (err) 1107 goto out; 1108 1109 sock = sock_alloc(); 1110 if (!sock) { 1111 err = -ENOMEM; 1112 goto out; 1113 } 1114 1115 sock->type = type; 1116 err = security_socket_post_create(sock, family, type, protocol, 1); 1117 if (err) 1118 goto out_release; 1119 1120 out: 1121 *res = sock; 1122 return err; 1123 out_release: 1124 sock_release(sock); 1125 sock = NULL; 1126 goto out; 1127 } 1128 EXPORT_SYMBOL(sock_create_lite); 1129 1130 /* No kernel lock held - perfect */ 1131 static __poll_t sock_poll(struct file *file, poll_table *wait) 1132 { 1133 struct socket *sock = file->private_data; 1134 __poll_t events = poll_requested_events(wait), flag = 0; 1135 1136 if (!sock->ops->poll) 1137 return 0; 1138 1139 if (sk_can_busy_loop(sock->sk)) { 1140 /* poll once if requested by the syscall */ 1141 if (events & POLL_BUSY_LOOP) 1142 sk_busy_loop(sock->sk, 1); 1143 1144 /* if this socket can poll_ll, tell the system call */ 1145 flag = POLL_BUSY_LOOP; 1146 } 1147 1148 return sock->ops->poll(file, sock, wait) | flag; 1149 } 1150 1151 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1152 { 1153 struct socket *sock = file->private_data; 1154 1155 return sock->ops->mmap(file, sock, vma); 1156 } 1157 1158 static int sock_close(struct inode *inode, struct file *filp) 1159 { 1160 __sock_release(SOCKET_I(inode), inode); 1161 return 0; 1162 } 1163 1164 /* 1165 * Update the socket async list 1166 * 1167 * Fasync_list locking strategy. 1168 * 1169 * 1. fasync_list is modified only under process context socket lock 1170 * i.e. under semaphore. 1171 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1172 * or under socket lock 1173 */ 1174 1175 static int sock_fasync(int fd, struct file *filp, int on) 1176 { 1177 struct socket *sock = filp->private_data; 1178 struct sock *sk = sock->sk; 1179 struct socket_wq *wq; 1180 1181 if (sk == NULL) 1182 return -EINVAL; 1183 1184 lock_sock(sk); 1185 wq = sock->wq; 1186 fasync_helper(fd, filp, on, &wq->fasync_list); 1187 1188 if (!wq->fasync_list) 1189 sock_reset_flag(sk, SOCK_FASYNC); 1190 else 1191 sock_set_flag(sk, SOCK_FASYNC); 1192 1193 release_sock(sk); 1194 return 0; 1195 } 1196 1197 /* This function may be called only under rcu_lock */ 1198 1199 int sock_wake_async(struct socket_wq *wq, int how, int band) 1200 { 1201 if (!wq || !wq->fasync_list) 1202 return -1; 1203 1204 switch (how) { 1205 case SOCK_WAKE_WAITD: 1206 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1207 break; 1208 goto call_kill; 1209 case SOCK_WAKE_SPACE: 1210 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1211 break; 1212 /* fall through */ 1213 case SOCK_WAKE_IO: 1214 call_kill: 1215 kill_fasync(&wq->fasync_list, SIGIO, band); 1216 break; 1217 case SOCK_WAKE_URG: 1218 kill_fasync(&wq->fasync_list, SIGURG, band); 1219 } 1220 1221 return 0; 1222 } 1223 EXPORT_SYMBOL(sock_wake_async); 1224 1225 int __sock_create(struct net *net, int family, int type, int protocol, 1226 struct socket **res, int kern) 1227 { 1228 int err; 1229 struct socket *sock; 1230 const struct net_proto_family *pf; 1231 1232 /* 1233 * Check protocol is in range 1234 */ 1235 if (family < 0 || family >= NPROTO) 1236 return -EAFNOSUPPORT; 1237 if (type < 0 || type >= SOCK_MAX) 1238 return -EINVAL; 1239 1240 /* Compatibility. 1241 1242 This uglymoron is moved from INET layer to here to avoid 1243 deadlock in module load. 1244 */ 1245 if (family == PF_INET && type == SOCK_PACKET) { 1246 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1247 current->comm); 1248 family = PF_PACKET; 1249 } 1250 1251 err = security_socket_create(family, type, protocol, kern); 1252 if (err) 1253 return err; 1254 1255 /* 1256 * Allocate the socket and allow the family to set things up. if 1257 * the protocol is 0, the family is instructed to select an appropriate 1258 * default. 1259 */ 1260 sock = sock_alloc(); 1261 if (!sock) { 1262 net_warn_ratelimited("socket: no more sockets\n"); 1263 return -ENFILE; /* Not exactly a match, but its the 1264 closest posix thing */ 1265 } 1266 1267 sock->type = type; 1268 1269 #ifdef CONFIG_MODULES 1270 /* Attempt to load a protocol module if the find failed. 1271 * 1272 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1273 * requested real, full-featured networking support upon configuration. 1274 * Otherwise module support will break! 1275 */ 1276 if (rcu_access_pointer(net_families[family]) == NULL) 1277 request_module("net-pf-%d", family); 1278 #endif 1279 1280 rcu_read_lock(); 1281 pf = rcu_dereference(net_families[family]); 1282 err = -EAFNOSUPPORT; 1283 if (!pf) 1284 goto out_release; 1285 1286 /* 1287 * We will call the ->create function, that possibly is in a loadable 1288 * module, so we have to bump that loadable module refcnt first. 1289 */ 1290 if (!try_module_get(pf->owner)) 1291 goto out_release; 1292 1293 /* Now protected by module ref count */ 1294 rcu_read_unlock(); 1295 1296 err = pf->create(net, sock, protocol, kern); 1297 if (err < 0) 1298 goto out_module_put; 1299 1300 /* 1301 * Now to bump the refcnt of the [loadable] module that owns this 1302 * socket at sock_release time we decrement its refcnt. 1303 */ 1304 if (!try_module_get(sock->ops->owner)) 1305 goto out_module_busy; 1306 1307 /* 1308 * Now that we're done with the ->create function, the [loadable] 1309 * module can have its refcnt decremented 1310 */ 1311 module_put(pf->owner); 1312 err = security_socket_post_create(sock, family, type, protocol, kern); 1313 if (err) 1314 goto out_sock_release; 1315 *res = sock; 1316 1317 return 0; 1318 1319 out_module_busy: 1320 err = -EAFNOSUPPORT; 1321 out_module_put: 1322 sock->ops = NULL; 1323 module_put(pf->owner); 1324 out_sock_release: 1325 sock_release(sock); 1326 return err; 1327 1328 out_release: 1329 rcu_read_unlock(); 1330 goto out_sock_release; 1331 } 1332 EXPORT_SYMBOL(__sock_create); 1333 1334 int sock_create(int family, int type, int protocol, struct socket **res) 1335 { 1336 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1337 } 1338 EXPORT_SYMBOL(sock_create); 1339 1340 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1341 { 1342 return __sock_create(net, family, type, protocol, res, 1); 1343 } 1344 EXPORT_SYMBOL(sock_create_kern); 1345 1346 int __sys_socket(int family, int type, int protocol) 1347 { 1348 int retval; 1349 struct socket *sock; 1350 int flags; 1351 1352 /* Check the SOCK_* constants for consistency. */ 1353 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1354 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1355 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1356 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1357 1358 flags = type & ~SOCK_TYPE_MASK; 1359 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1360 return -EINVAL; 1361 type &= SOCK_TYPE_MASK; 1362 1363 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1364 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1365 1366 retval = sock_create(family, type, protocol, &sock); 1367 if (retval < 0) 1368 return retval; 1369 1370 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1371 } 1372 1373 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1374 { 1375 return __sys_socket(family, type, protocol); 1376 } 1377 1378 /* 1379 * Create a pair of connected sockets. 1380 */ 1381 1382 int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) 1383 { 1384 struct socket *sock1, *sock2; 1385 int fd1, fd2, err; 1386 struct file *newfile1, *newfile2; 1387 int flags; 1388 1389 flags = type & ~SOCK_TYPE_MASK; 1390 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1391 return -EINVAL; 1392 type &= SOCK_TYPE_MASK; 1393 1394 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1395 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1396 1397 /* 1398 * reserve descriptors and make sure we won't fail 1399 * to return them to userland. 1400 */ 1401 fd1 = get_unused_fd_flags(flags); 1402 if (unlikely(fd1 < 0)) 1403 return fd1; 1404 1405 fd2 = get_unused_fd_flags(flags); 1406 if (unlikely(fd2 < 0)) { 1407 put_unused_fd(fd1); 1408 return fd2; 1409 } 1410 1411 err = put_user(fd1, &usockvec[0]); 1412 if (err) 1413 goto out; 1414 1415 err = put_user(fd2, &usockvec[1]); 1416 if (err) 1417 goto out; 1418 1419 /* 1420 * Obtain the first socket and check if the underlying protocol 1421 * supports the socketpair call. 1422 */ 1423 1424 err = sock_create(family, type, protocol, &sock1); 1425 if (unlikely(err < 0)) 1426 goto out; 1427 1428 err = sock_create(family, type, protocol, &sock2); 1429 if (unlikely(err < 0)) { 1430 sock_release(sock1); 1431 goto out; 1432 } 1433 1434 err = security_socket_socketpair(sock1, sock2); 1435 if (unlikely(err)) { 1436 sock_release(sock2); 1437 sock_release(sock1); 1438 goto out; 1439 } 1440 1441 err = sock1->ops->socketpair(sock1, sock2); 1442 if (unlikely(err < 0)) { 1443 sock_release(sock2); 1444 sock_release(sock1); 1445 goto out; 1446 } 1447 1448 newfile1 = sock_alloc_file(sock1, flags, NULL); 1449 if (IS_ERR(newfile1)) { 1450 err = PTR_ERR(newfile1); 1451 sock_release(sock2); 1452 goto out; 1453 } 1454 1455 newfile2 = sock_alloc_file(sock2, flags, NULL); 1456 if (IS_ERR(newfile2)) { 1457 err = PTR_ERR(newfile2); 1458 fput(newfile1); 1459 goto out; 1460 } 1461 1462 audit_fd_pair(fd1, fd2); 1463 1464 fd_install(fd1, newfile1); 1465 fd_install(fd2, newfile2); 1466 return 0; 1467 1468 out: 1469 put_unused_fd(fd2); 1470 put_unused_fd(fd1); 1471 return err; 1472 } 1473 1474 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1475 int __user *, usockvec) 1476 { 1477 return __sys_socketpair(family, type, protocol, usockvec); 1478 } 1479 1480 /* 1481 * Bind a name to a socket. Nothing much to do here since it's 1482 * the protocol's responsibility to handle the local address. 1483 * 1484 * We move the socket address to kernel space before we call 1485 * the protocol layer (having also checked the address is ok). 1486 */ 1487 1488 int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 1489 { 1490 struct socket *sock; 1491 struct sockaddr_storage address; 1492 int err, fput_needed; 1493 1494 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1495 if (sock) { 1496 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1497 if (!err) { 1498 err = security_socket_bind(sock, 1499 (struct sockaddr *)&address, 1500 addrlen); 1501 if (!err) 1502 err = sock->ops->bind(sock, 1503 (struct sockaddr *) 1504 &address, addrlen); 1505 } 1506 fput_light(sock->file, fput_needed); 1507 } 1508 return err; 1509 } 1510 1511 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1512 { 1513 return __sys_bind(fd, umyaddr, addrlen); 1514 } 1515 1516 /* 1517 * Perform a listen. Basically, we allow the protocol to do anything 1518 * necessary for a listen, and if that works, we mark the socket as 1519 * ready for listening. 1520 */ 1521 1522 int __sys_listen(int fd, int backlog) 1523 { 1524 struct socket *sock; 1525 int err, fput_needed; 1526 int somaxconn; 1527 1528 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1529 if (sock) { 1530 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1531 if ((unsigned int)backlog > somaxconn) 1532 backlog = somaxconn; 1533 1534 err = security_socket_listen(sock, backlog); 1535 if (!err) 1536 err = sock->ops->listen(sock, backlog); 1537 1538 fput_light(sock->file, fput_needed); 1539 } 1540 return err; 1541 } 1542 1543 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1544 { 1545 return __sys_listen(fd, backlog); 1546 } 1547 1548 /* 1549 * For accept, we attempt to create a new socket, set up the link 1550 * with the client, wake up the client, then return the new 1551 * connected fd. We collect the address of the connector in kernel 1552 * space and move it to user at the very end. This is unclean because 1553 * we open the socket then return an error. 1554 * 1555 * 1003.1g adds the ability to recvmsg() to query connection pending 1556 * status to recvmsg. We need to add that support in a way thats 1557 * clean when we restructure accept also. 1558 */ 1559 1560 int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 1561 int __user *upeer_addrlen, int flags) 1562 { 1563 struct socket *sock, *newsock; 1564 struct file *newfile; 1565 int err, len, newfd, fput_needed; 1566 struct sockaddr_storage address; 1567 1568 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1569 return -EINVAL; 1570 1571 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1572 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1573 1574 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1575 if (!sock) 1576 goto out; 1577 1578 err = -ENFILE; 1579 newsock = sock_alloc(); 1580 if (!newsock) 1581 goto out_put; 1582 1583 newsock->type = sock->type; 1584 newsock->ops = sock->ops; 1585 1586 /* 1587 * We don't need try_module_get here, as the listening socket (sock) 1588 * has the protocol module (sock->ops->owner) held. 1589 */ 1590 __module_get(newsock->ops->owner); 1591 1592 newfd = get_unused_fd_flags(flags); 1593 if (unlikely(newfd < 0)) { 1594 err = newfd; 1595 sock_release(newsock); 1596 goto out_put; 1597 } 1598 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1599 if (IS_ERR(newfile)) { 1600 err = PTR_ERR(newfile); 1601 put_unused_fd(newfd); 1602 goto out_put; 1603 } 1604 1605 err = security_socket_accept(sock, newsock); 1606 if (err) 1607 goto out_fd; 1608 1609 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 1610 if (err < 0) 1611 goto out_fd; 1612 1613 if (upeer_sockaddr) { 1614 len = newsock->ops->getname(newsock, 1615 (struct sockaddr *)&address, 2); 1616 if (len < 0) { 1617 err = -ECONNABORTED; 1618 goto out_fd; 1619 } 1620 err = move_addr_to_user(&address, 1621 len, upeer_sockaddr, upeer_addrlen); 1622 if (err < 0) 1623 goto out_fd; 1624 } 1625 1626 /* File flags are not inherited via accept() unlike another OSes. */ 1627 1628 fd_install(newfd, newfile); 1629 err = newfd; 1630 1631 out_put: 1632 fput_light(sock->file, fput_needed); 1633 out: 1634 return err; 1635 out_fd: 1636 fput(newfile); 1637 put_unused_fd(newfd); 1638 goto out_put; 1639 } 1640 1641 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1642 int __user *, upeer_addrlen, int, flags) 1643 { 1644 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); 1645 } 1646 1647 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1648 int __user *, upeer_addrlen) 1649 { 1650 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1651 } 1652 1653 /* 1654 * Attempt to connect to a socket with the server address. The address 1655 * is in user space so we verify it is OK and move it to kernel space. 1656 * 1657 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1658 * break bindings 1659 * 1660 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1661 * other SEQPACKET protocols that take time to connect() as it doesn't 1662 * include the -EINPROGRESS status for such sockets. 1663 */ 1664 1665 int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 1666 { 1667 struct socket *sock; 1668 struct sockaddr_storage address; 1669 int err, fput_needed; 1670 1671 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1672 if (!sock) 1673 goto out; 1674 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1675 if (err < 0) 1676 goto out_put; 1677 1678 err = 1679 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1680 if (err) 1681 goto out_put; 1682 1683 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1684 sock->file->f_flags); 1685 out_put: 1686 fput_light(sock->file, fput_needed); 1687 out: 1688 return err; 1689 } 1690 1691 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1692 int, addrlen) 1693 { 1694 return __sys_connect(fd, uservaddr, addrlen); 1695 } 1696 1697 /* 1698 * Get the local address ('name') of a socket object. Move the obtained 1699 * name to user space. 1700 */ 1701 1702 int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, 1703 int __user *usockaddr_len) 1704 { 1705 struct socket *sock; 1706 struct sockaddr_storage address; 1707 int err, fput_needed; 1708 1709 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1710 if (!sock) 1711 goto out; 1712 1713 err = security_socket_getsockname(sock); 1714 if (err) 1715 goto out_put; 1716 1717 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); 1718 if (err < 0) 1719 goto out_put; 1720 /* "err" is actually length in this case */ 1721 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); 1722 1723 out_put: 1724 fput_light(sock->file, fput_needed); 1725 out: 1726 return err; 1727 } 1728 1729 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1730 int __user *, usockaddr_len) 1731 { 1732 return __sys_getsockname(fd, usockaddr, usockaddr_len); 1733 } 1734 1735 /* 1736 * Get the remote address ('name') of a socket object. Move the obtained 1737 * name to user space. 1738 */ 1739 1740 int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, 1741 int __user *usockaddr_len) 1742 { 1743 struct socket *sock; 1744 struct sockaddr_storage address; 1745 int err, fput_needed; 1746 1747 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1748 if (sock != NULL) { 1749 err = security_socket_getpeername(sock); 1750 if (err) { 1751 fput_light(sock->file, fput_needed); 1752 return err; 1753 } 1754 1755 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); 1756 if (err >= 0) 1757 /* "err" is actually length in this case */ 1758 err = move_addr_to_user(&address, err, usockaddr, 1759 usockaddr_len); 1760 fput_light(sock->file, fput_needed); 1761 } 1762 return err; 1763 } 1764 1765 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1766 int __user *, usockaddr_len) 1767 { 1768 return __sys_getpeername(fd, usockaddr, usockaddr_len); 1769 } 1770 1771 /* 1772 * Send a datagram to a given address. We move the address into kernel 1773 * space and check the user space data area is readable before invoking 1774 * the protocol. 1775 */ 1776 int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, 1777 struct sockaddr __user *addr, int addr_len) 1778 { 1779 struct socket *sock; 1780 struct sockaddr_storage address; 1781 int err; 1782 struct msghdr msg; 1783 struct iovec iov; 1784 int fput_needed; 1785 1786 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1787 if (unlikely(err)) 1788 return err; 1789 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1790 if (!sock) 1791 goto out; 1792 1793 msg.msg_name = NULL; 1794 msg.msg_control = NULL; 1795 msg.msg_controllen = 0; 1796 msg.msg_namelen = 0; 1797 if (addr) { 1798 err = move_addr_to_kernel(addr, addr_len, &address); 1799 if (err < 0) 1800 goto out_put; 1801 msg.msg_name = (struct sockaddr *)&address; 1802 msg.msg_namelen = addr_len; 1803 } 1804 if (sock->file->f_flags & O_NONBLOCK) 1805 flags |= MSG_DONTWAIT; 1806 msg.msg_flags = flags; 1807 err = sock_sendmsg(sock, &msg); 1808 1809 out_put: 1810 fput_light(sock->file, fput_needed); 1811 out: 1812 return err; 1813 } 1814 1815 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1816 unsigned int, flags, struct sockaddr __user *, addr, 1817 int, addr_len) 1818 { 1819 return __sys_sendto(fd, buff, len, flags, addr, addr_len); 1820 } 1821 1822 /* 1823 * Send a datagram down a socket. 1824 */ 1825 1826 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1827 unsigned int, flags) 1828 { 1829 return __sys_sendto(fd, buff, len, flags, NULL, 0); 1830 } 1831 1832 /* 1833 * Receive a frame from the socket and optionally record the address of the 1834 * sender. We verify the buffers are writable and if needed move the 1835 * sender address from kernel to user space. 1836 */ 1837 int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, 1838 struct sockaddr __user *addr, int __user *addr_len) 1839 { 1840 struct socket *sock; 1841 struct iovec iov; 1842 struct msghdr msg; 1843 struct sockaddr_storage address; 1844 int err, err2; 1845 int fput_needed; 1846 1847 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1848 if (unlikely(err)) 1849 return err; 1850 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1851 if (!sock) 1852 goto out; 1853 1854 msg.msg_control = NULL; 1855 msg.msg_controllen = 0; 1856 /* Save some cycles and don't copy the address if not needed */ 1857 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1858 /* We assume all kernel code knows the size of sockaddr_storage */ 1859 msg.msg_namelen = 0; 1860 msg.msg_iocb = NULL; 1861 msg.msg_flags = 0; 1862 if (sock->file->f_flags & O_NONBLOCK) 1863 flags |= MSG_DONTWAIT; 1864 err = sock_recvmsg(sock, &msg, flags); 1865 1866 if (err >= 0 && addr != NULL) { 1867 err2 = move_addr_to_user(&address, 1868 msg.msg_namelen, addr, addr_len); 1869 if (err2 < 0) 1870 err = err2; 1871 } 1872 1873 fput_light(sock->file, fput_needed); 1874 out: 1875 return err; 1876 } 1877 1878 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1879 unsigned int, flags, struct sockaddr __user *, addr, 1880 int __user *, addr_len) 1881 { 1882 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); 1883 } 1884 1885 /* 1886 * Receive a datagram from a socket. 1887 */ 1888 1889 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1890 unsigned int, flags) 1891 { 1892 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1893 } 1894 1895 /* 1896 * Set a socket option. Because we don't know the option lengths we have 1897 * to pass the user mode parameter for the protocols to sort out. 1898 */ 1899 1900 static int __sys_setsockopt(int fd, int level, int optname, 1901 char __user *optval, int optlen) 1902 { 1903 int err, fput_needed; 1904 struct socket *sock; 1905 1906 if (optlen < 0) 1907 return -EINVAL; 1908 1909 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1910 if (sock != NULL) { 1911 err = security_socket_setsockopt(sock, level, optname); 1912 if (err) 1913 goto out_put; 1914 1915 if (level == SOL_SOCKET) 1916 err = 1917 sock_setsockopt(sock, level, optname, optval, 1918 optlen); 1919 else 1920 err = 1921 sock->ops->setsockopt(sock, level, optname, optval, 1922 optlen); 1923 out_put: 1924 fput_light(sock->file, fput_needed); 1925 } 1926 return err; 1927 } 1928 1929 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1930 char __user *, optval, int, optlen) 1931 { 1932 return __sys_setsockopt(fd, level, optname, optval, optlen); 1933 } 1934 1935 /* 1936 * Get a socket option. Because we don't know the option lengths we have 1937 * to pass a user mode parameter for the protocols to sort out. 1938 */ 1939 1940 static int __sys_getsockopt(int fd, int level, int optname, 1941 char __user *optval, int __user *optlen) 1942 { 1943 int err, fput_needed; 1944 struct socket *sock; 1945 1946 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1947 if (sock != NULL) { 1948 err = security_socket_getsockopt(sock, level, optname); 1949 if (err) 1950 goto out_put; 1951 1952 if (level == SOL_SOCKET) 1953 err = 1954 sock_getsockopt(sock, level, optname, optval, 1955 optlen); 1956 else 1957 err = 1958 sock->ops->getsockopt(sock, level, optname, optval, 1959 optlen); 1960 out_put: 1961 fput_light(sock->file, fput_needed); 1962 } 1963 return err; 1964 } 1965 1966 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1967 char __user *, optval, int __user *, optlen) 1968 { 1969 return __sys_getsockopt(fd, level, optname, optval, optlen); 1970 } 1971 1972 /* 1973 * Shutdown a socket. 1974 */ 1975 1976 int __sys_shutdown(int fd, int how) 1977 { 1978 int err, fput_needed; 1979 struct socket *sock; 1980 1981 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1982 if (sock != NULL) { 1983 err = security_socket_shutdown(sock, how); 1984 if (!err) 1985 err = sock->ops->shutdown(sock, how); 1986 fput_light(sock->file, fput_needed); 1987 } 1988 return err; 1989 } 1990 1991 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1992 { 1993 return __sys_shutdown(fd, how); 1994 } 1995 1996 /* A couple of helpful macros for getting the address of the 32/64 bit 1997 * fields which are the same type (int / unsigned) on our platforms. 1998 */ 1999 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 2000 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 2001 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 2002 2003 struct used_address { 2004 struct sockaddr_storage name; 2005 unsigned int name_len; 2006 }; 2007 2008 static int copy_msghdr_from_user(struct msghdr *kmsg, 2009 struct user_msghdr __user *umsg, 2010 struct sockaddr __user **save_addr, 2011 struct iovec **iov) 2012 { 2013 struct user_msghdr msg; 2014 ssize_t err; 2015 2016 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 2017 return -EFAULT; 2018 2019 kmsg->msg_control = (void __force *)msg.msg_control; 2020 kmsg->msg_controllen = msg.msg_controllen; 2021 kmsg->msg_flags = msg.msg_flags; 2022 2023 kmsg->msg_namelen = msg.msg_namelen; 2024 if (!msg.msg_name) 2025 kmsg->msg_namelen = 0; 2026 2027 if (kmsg->msg_namelen < 0) 2028 return -EINVAL; 2029 2030 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 2031 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 2032 2033 if (save_addr) 2034 *save_addr = msg.msg_name; 2035 2036 if (msg.msg_name && kmsg->msg_namelen) { 2037 if (!save_addr) { 2038 err = move_addr_to_kernel(msg.msg_name, 2039 kmsg->msg_namelen, 2040 kmsg->msg_name); 2041 if (err < 0) 2042 return err; 2043 } 2044 } else { 2045 kmsg->msg_name = NULL; 2046 kmsg->msg_namelen = 0; 2047 } 2048 2049 if (msg.msg_iovlen > UIO_MAXIOV) 2050 return -EMSGSIZE; 2051 2052 kmsg->msg_iocb = NULL; 2053 2054 return import_iovec(save_addr ? READ : WRITE, 2055 msg.msg_iov, msg.msg_iovlen, 2056 UIO_FASTIOV, iov, &kmsg->msg_iter); 2057 } 2058 2059 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 2060 struct msghdr *msg_sys, unsigned int flags, 2061 struct used_address *used_address, 2062 unsigned int allowed_msghdr_flags) 2063 { 2064 struct compat_msghdr __user *msg_compat = 2065 (struct compat_msghdr __user *)msg; 2066 struct sockaddr_storage address; 2067 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2068 unsigned char ctl[sizeof(struct cmsghdr) + 20] 2069 __aligned(sizeof(__kernel_size_t)); 2070 /* 20 is size of ipv6_pktinfo */ 2071 unsigned char *ctl_buf = ctl; 2072 int ctl_len; 2073 ssize_t err; 2074 2075 msg_sys->msg_name = &address; 2076 2077 if (MSG_CMSG_COMPAT & flags) 2078 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 2079 else 2080 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 2081 if (err < 0) 2082 return err; 2083 2084 err = -ENOBUFS; 2085 2086 if (msg_sys->msg_controllen > INT_MAX) 2087 goto out_freeiov; 2088 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 2089 ctl_len = msg_sys->msg_controllen; 2090 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2091 err = 2092 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2093 sizeof(ctl)); 2094 if (err) 2095 goto out_freeiov; 2096 ctl_buf = msg_sys->msg_control; 2097 ctl_len = msg_sys->msg_controllen; 2098 } else if (ctl_len) { 2099 BUILD_BUG_ON(sizeof(struct cmsghdr) != 2100 CMSG_ALIGN(sizeof(struct cmsghdr))); 2101 if (ctl_len > sizeof(ctl)) { 2102 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2103 if (ctl_buf == NULL) 2104 goto out_freeiov; 2105 } 2106 err = -EFAULT; 2107 /* 2108 * Careful! Before this, msg_sys->msg_control contains a user pointer. 2109 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 2110 * checking falls down on this. 2111 */ 2112 if (copy_from_user(ctl_buf, 2113 (void __user __force *)msg_sys->msg_control, 2114 ctl_len)) 2115 goto out_freectl; 2116 msg_sys->msg_control = ctl_buf; 2117 } 2118 msg_sys->msg_flags = flags; 2119 2120 if (sock->file->f_flags & O_NONBLOCK) 2121 msg_sys->msg_flags |= MSG_DONTWAIT; 2122 /* 2123 * If this is sendmmsg() and current destination address is same as 2124 * previously succeeded address, omit asking LSM's decision. 2125 * used_address->name_len is initialized to UINT_MAX so that the first 2126 * destination address never matches. 2127 */ 2128 if (used_address && msg_sys->msg_name && 2129 used_address->name_len == msg_sys->msg_namelen && 2130 !memcmp(&used_address->name, msg_sys->msg_name, 2131 used_address->name_len)) { 2132 err = sock_sendmsg_nosec(sock, msg_sys); 2133 goto out_freectl; 2134 } 2135 err = sock_sendmsg(sock, msg_sys); 2136 /* 2137 * If this is sendmmsg() and sending to current destination address was 2138 * successful, remember it. 2139 */ 2140 if (used_address && err >= 0) { 2141 used_address->name_len = msg_sys->msg_namelen; 2142 if (msg_sys->msg_name) 2143 memcpy(&used_address->name, msg_sys->msg_name, 2144 used_address->name_len); 2145 } 2146 2147 out_freectl: 2148 if (ctl_buf != ctl) 2149 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2150 out_freeiov: 2151 kfree(iov); 2152 return err; 2153 } 2154 2155 /* 2156 * BSD sendmsg interface 2157 */ 2158 2159 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2160 bool forbid_cmsg_compat) 2161 { 2162 int fput_needed, err; 2163 struct msghdr msg_sys; 2164 struct socket *sock; 2165 2166 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2167 return -EINVAL; 2168 2169 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2170 if (!sock) 2171 goto out; 2172 2173 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2174 2175 fput_light(sock->file, fput_needed); 2176 out: 2177 return err; 2178 } 2179 2180 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2181 { 2182 return __sys_sendmsg(fd, msg, flags, true); 2183 } 2184 2185 /* 2186 * Linux sendmmsg interface 2187 */ 2188 2189 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2190 unsigned int flags, bool forbid_cmsg_compat) 2191 { 2192 int fput_needed, err, datagrams; 2193 struct socket *sock; 2194 struct mmsghdr __user *entry; 2195 struct compat_mmsghdr __user *compat_entry; 2196 struct msghdr msg_sys; 2197 struct used_address used_address; 2198 unsigned int oflags = flags; 2199 2200 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2201 return -EINVAL; 2202 2203 if (vlen > UIO_MAXIOV) 2204 vlen = UIO_MAXIOV; 2205 2206 datagrams = 0; 2207 2208 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2209 if (!sock) 2210 return err; 2211 2212 used_address.name_len = UINT_MAX; 2213 entry = mmsg; 2214 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2215 err = 0; 2216 flags |= MSG_BATCH; 2217 2218 while (datagrams < vlen) { 2219 if (datagrams == vlen - 1) 2220 flags = oflags; 2221 2222 if (MSG_CMSG_COMPAT & flags) { 2223 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2224 &msg_sys, flags, &used_address, MSG_EOR); 2225 if (err < 0) 2226 break; 2227 err = __put_user(err, &compat_entry->msg_len); 2228 ++compat_entry; 2229 } else { 2230 err = ___sys_sendmsg(sock, 2231 (struct user_msghdr __user *)entry, 2232 &msg_sys, flags, &used_address, MSG_EOR); 2233 if (err < 0) 2234 break; 2235 err = put_user(err, &entry->msg_len); 2236 ++entry; 2237 } 2238 2239 if (err) 2240 break; 2241 ++datagrams; 2242 if (msg_data_left(&msg_sys)) 2243 break; 2244 cond_resched(); 2245 } 2246 2247 fput_light(sock->file, fput_needed); 2248 2249 /* We only return an error if no datagrams were able to be sent */ 2250 if (datagrams != 0) 2251 return datagrams; 2252 2253 return err; 2254 } 2255 2256 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2257 unsigned int, vlen, unsigned int, flags) 2258 { 2259 return __sys_sendmmsg(fd, mmsg, vlen, flags, true); 2260 } 2261 2262 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2263 struct msghdr *msg_sys, unsigned int flags, int nosec) 2264 { 2265 struct compat_msghdr __user *msg_compat = 2266 (struct compat_msghdr __user *)msg; 2267 struct iovec iovstack[UIO_FASTIOV]; 2268 struct iovec *iov = iovstack; 2269 unsigned long cmsg_ptr; 2270 int len; 2271 ssize_t err; 2272 2273 /* kernel mode address */ 2274 struct sockaddr_storage addr; 2275 2276 /* user mode address pointers */ 2277 struct sockaddr __user *uaddr; 2278 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2279 2280 msg_sys->msg_name = &addr; 2281 2282 if (MSG_CMSG_COMPAT & flags) 2283 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2284 else 2285 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 2286 if (err < 0) 2287 return err; 2288 2289 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2290 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2291 2292 /* We assume all kernel code knows the size of sockaddr_storage */ 2293 msg_sys->msg_namelen = 0; 2294 2295 if (sock->file->f_flags & O_NONBLOCK) 2296 flags |= MSG_DONTWAIT; 2297 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 2298 if (err < 0) 2299 goto out_freeiov; 2300 len = err; 2301 2302 if (uaddr != NULL) { 2303 err = move_addr_to_user(&addr, 2304 msg_sys->msg_namelen, uaddr, 2305 uaddr_len); 2306 if (err < 0) 2307 goto out_freeiov; 2308 } 2309 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2310 COMPAT_FLAGS(msg)); 2311 if (err) 2312 goto out_freeiov; 2313 if (MSG_CMSG_COMPAT & flags) 2314 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2315 &msg_compat->msg_controllen); 2316 else 2317 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2318 &msg->msg_controllen); 2319 if (err) 2320 goto out_freeiov; 2321 err = len; 2322 2323 out_freeiov: 2324 kfree(iov); 2325 return err; 2326 } 2327 2328 /* 2329 * BSD recvmsg interface 2330 */ 2331 2332 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2333 bool forbid_cmsg_compat) 2334 { 2335 int fput_needed, err; 2336 struct msghdr msg_sys; 2337 struct socket *sock; 2338 2339 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2340 return -EINVAL; 2341 2342 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2343 if (!sock) 2344 goto out; 2345 2346 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2347 2348 fput_light(sock->file, fput_needed); 2349 out: 2350 return err; 2351 } 2352 2353 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2354 unsigned int, flags) 2355 { 2356 return __sys_recvmsg(fd, msg, flags, true); 2357 } 2358 2359 /* 2360 * Linux recvmmsg interface 2361 */ 2362 2363 static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2364 unsigned int vlen, unsigned int flags, 2365 struct timespec64 *timeout) 2366 { 2367 int fput_needed, err, datagrams; 2368 struct socket *sock; 2369 struct mmsghdr __user *entry; 2370 struct compat_mmsghdr __user *compat_entry; 2371 struct msghdr msg_sys; 2372 struct timespec64 end_time; 2373 struct timespec64 timeout64; 2374 2375 if (timeout && 2376 poll_select_set_timeout(&end_time, timeout->tv_sec, 2377 timeout->tv_nsec)) 2378 return -EINVAL; 2379 2380 datagrams = 0; 2381 2382 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2383 if (!sock) 2384 return err; 2385 2386 if (likely(!(flags & MSG_ERRQUEUE))) { 2387 err = sock_error(sock->sk); 2388 if (err) { 2389 datagrams = err; 2390 goto out_put; 2391 } 2392 } 2393 2394 entry = mmsg; 2395 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2396 2397 while (datagrams < vlen) { 2398 /* 2399 * No need to ask LSM for more than the first datagram. 2400 */ 2401 if (MSG_CMSG_COMPAT & flags) { 2402 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2403 &msg_sys, flags & ~MSG_WAITFORONE, 2404 datagrams); 2405 if (err < 0) 2406 break; 2407 err = __put_user(err, &compat_entry->msg_len); 2408 ++compat_entry; 2409 } else { 2410 err = ___sys_recvmsg(sock, 2411 (struct user_msghdr __user *)entry, 2412 &msg_sys, flags & ~MSG_WAITFORONE, 2413 datagrams); 2414 if (err < 0) 2415 break; 2416 err = put_user(err, &entry->msg_len); 2417 ++entry; 2418 } 2419 2420 if (err) 2421 break; 2422 ++datagrams; 2423 2424 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2425 if (flags & MSG_WAITFORONE) 2426 flags |= MSG_DONTWAIT; 2427 2428 if (timeout) { 2429 ktime_get_ts64(&timeout64); 2430 *timeout = timespec64_sub(end_time, timeout64); 2431 if (timeout->tv_sec < 0) { 2432 timeout->tv_sec = timeout->tv_nsec = 0; 2433 break; 2434 } 2435 2436 /* Timeout, return less than vlen datagrams */ 2437 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2438 break; 2439 } 2440 2441 /* Out of band data, return right away */ 2442 if (msg_sys.msg_flags & MSG_OOB) 2443 break; 2444 cond_resched(); 2445 } 2446 2447 if (err == 0) 2448 goto out_put; 2449 2450 if (datagrams == 0) { 2451 datagrams = err; 2452 goto out_put; 2453 } 2454 2455 /* 2456 * We may return less entries than requested (vlen) if the 2457 * sock is non block and there aren't enough datagrams... 2458 */ 2459 if (err != -EAGAIN) { 2460 /* 2461 * ... or if recvmsg returns an error after we 2462 * received some datagrams, where we record the 2463 * error to return on the next call or if the 2464 * app asks about it using getsockopt(SO_ERROR). 2465 */ 2466 sock->sk->sk_err = -err; 2467 } 2468 out_put: 2469 fput_light(sock->file, fput_needed); 2470 2471 return datagrams; 2472 } 2473 2474 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2475 unsigned int vlen, unsigned int flags, 2476 struct __kernel_timespec __user *timeout, 2477 struct old_timespec32 __user *timeout32) 2478 { 2479 int datagrams; 2480 struct timespec64 timeout_sys; 2481 2482 if (timeout && get_timespec64(&timeout_sys, timeout)) 2483 return -EFAULT; 2484 2485 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) 2486 return -EFAULT; 2487 2488 if (!timeout && !timeout32) 2489 return do_recvmmsg(fd, mmsg, vlen, flags, NULL); 2490 2491 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2492 2493 if (datagrams <= 0) 2494 return datagrams; 2495 2496 if (timeout && put_timespec64(&timeout_sys, timeout)) 2497 datagrams = -EFAULT; 2498 2499 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) 2500 datagrams = -EFAULT; 2501 2502 return datagrams; 2503 } 2504 2505 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2506 unsigned int, vlen, unsigned int, flags, 2507 struct __kernel_timespec __user *, timeout) 2508 { 2509 if (flags & MSG_CMSG_COMPAT) 2510 return -EINVAL; 2511 2512 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); 2513 } 2514 2515 #ifdef CONFIG_COMPAT_32BIT_TIME 2516 SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, 2517 unsigned int, vlen, unsigned int, flags, 2518 struct old_timespec32 __user *, timeout) 2519 { 2520 if (flags & MSG_CMSG_COMPAT) 2521 return -EINVAL; 2522 2523 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); 2524 } 2525 #endif 2526 2527 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2528 /* Argument list sizes for sys_socketcall */ 2529 #define AL(x) ((x) * sizeof(unsigned long)) 2530 static const unsigned char nargs[21] = { 2531 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2532 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2533 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2534 AL(4), AL(5), AL(4) 2535 }; 2536 2537 #undef AL 2538 2539 /* 2540 * System call vectors. 2541 * 2542 * Argument checking cleaned up. Saved 20% in size. 2543 * This function doesn't need to set the kernel lock because 2544 * it is set by the callees. 2545 */ 2546 2547 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2548 { 2549 unsigned long a[AUDITSC_ARGS]; 2550 unsigned long a0, a1; 2551 int err; 2552 unsigned int len; 2553 2554 if (call < 1 || call > SYS_SENDMMSG) 2555 return -EINVAL; 2556 call = array_index_nospec(call, SYS_SENDMMSG + 1); 2557 2558 len = nargs[call]; 2559 if (len > sizeof(a)) 2560 return -EINVAL; 2561 2562 /* copy_from_user should be SMP safe. */ 2563 if (copy_from_user(a, args, len)) 2564 return -EFAULT; 2565 2566 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2567 if (err) 2568 return err; 2569 2570 a0 = a[0]; 2571 a1 = a[1]; 2572 2573 switch (call) { 2574 case SYS_SOCKET: 2575 err = __sys_socket(a0, a1, a[2]); 2576 break; 2577 case SYS_BIND: 2578 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2579 break; 2580 case SYS_CONNECT: 2581 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2582 break; 2583 case SYS_LISTEN: 2584 err = __sys_listen(a0, a1); 2585 break; 2586 case SYS_ACCEPT: 2587 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2588 (int __user *)a[2], 0); 2589 break; 2590 case SYS_GETSOCKNAME: 2591 err = 2592 __sys_getsockname(a0, (struct sockaddr __user *)a1, 2593 (int __user *)a[2]); 2594 break; 2595 case SYS_GETPEERNAME: 2596 err = 2597 __sys_getpeername(a0, (struct sockaddr __user *)a1, 2598 (int __user *)a[2]); 2599 break; 2600 case SYS_SOCKETPAIR: 2601 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2602 break; 2603 case SYS_SEND: 2604 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2605 NULL, 0); 2606 break; 2607 case SYS_SENDTO: 2608 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2609 (struct sockaddr __user *)a[4], a[5]); 2610 break; 2611 case SYS_RECV: 2612 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2613 NULL, NULL); 2614 break; 2615 case SYS_RECVFROM: 2616 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2617 (struct sockaddr __user *)a[4], 2618 (int __user *)a[5]); 2619 break; 2620 case SYS_SHUTDOWN: 2621 err = __sys_shutdown(a0, a1); 2622 break; 2623 case SYS_SETSOCKOPT: 2624 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], 2625 a[4]); 2626 break; 2627 case SYS_GETSOCKOPT: 2628 err = 2629 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2630 (int __user *)a[4]); 2631 break; 2632 case SYS_SENDMSG: 2633 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, 2634 a[2], true); 2635 break; 2636 case SYS_SENDMMSG: 2637 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], 2638 a[3], true); 2639 break; 2640 case SYS_RECVMSG: 2641 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, 2642 a[2], true); 2643 break; 2644 case SYS_RECVMMSG: 2645 if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME)) 2646 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 2647 a[2], a[3], 2648 (struct __kernel_timespec __user *)a[4], 2649 NULL); 2650 else 2651 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 2652 a[2], a[3], NULL, 2653 (struct old_timespec32 __user *)a[4]); 2654 break; 2655 case SYS_ACCEPT4: 2656 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2657 (int __user *)a[2], a[3]); 2658 break; 2659 default: 2660 err = -EINVAL; 2661 break; 2662 } 2663 return err; 2664 } 2665 2666 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2667 2668 /** 2669 * sock_register - add a socket protocol handler 2670 * @ops: description of protocol 2671 * 2672 * This function is called by a protocol handler that wants to 2673 * advertise its address family, and have it linked into the 2674 * socket interface. The value ops->family corresponds to the 2675 * socket system call protocol family. 2676 */ 2677 int sock_register(const struct net_proto_family *ops) 2678 { 2679 int err; 2680 2681 if (ops->family >= NPROTO) { 2682 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2683 return -ENOBUFS; 2684 } 2685 2686 spin_lock(&net_family_lock); 2687 if (rcu_dereference_protected(net_families[ops->family], 2688 lockdep_is_held(&net_family_lock))) 2689 err = -EEXIST; 2690 else { 2691 rcu_assign_pointer(net_families[ops->family], ops); 2692 err = 0; 2693 } 2694 spin_unlock(&net_family_lock); 2695 2696 pr_info("NET: Registered protocol family %d\n", ops->family); 2697 return err; 2698 } 2699 EXPORT_SYMBOL(sock_register); 2700 2701 /** 2702 * sock_unregister - remove a protocol handler 2703 * @family: protocol family to remove 2704 * 2705 * This function is called by a protocol handler that wants to 2706 * remove its address family, and have it unlinked from the 2707 * new socket creation. 2708 * 2709 * If protocol handler is a module, then it can use module reference 2710 * counts to protect against new references. If protocol handler is not 2711 * a module then it needs to provide its own protection in 2712 * the ops->create routine. 2713 */ 2714 void sock_unregister(int family) 2715 { 2716 BUG_ON(family < 0 || family >= NPROTO); 2717 2718 spin_lock(&net_family_lock); 2719 RCU_INIT_POINTER(net_families[family], NULL); 2720 spin_unlock(&net_family_lock); 2721 2722 synchronize_rcu(); 2723 2724 pr_info("NET: Unregistered protocol family %d\n", family); 2725 } 2726 EXPORT_SYMBOL(sock_unregister); 2727 2728 bool sock_is_registered(int family) 2729 { 2730 return family < NPROTO && rcu_access_pointer(net_families[family]); 2731 } 2732 2733 static int __init sock_init(void) 2734 { 2735 int err; 2736 /* 2737 * Initialize the network sysctl infrastructure. 2738 */ 2739 err = net_sysctl_init(); 2740 if (err) 2741 goto out; 2742 2743 /* 2744 * Initialize skbuff SLAB cache 2745 */ 2746 skb_init(); 2747 2748 /* 2749 * Initialize the protocols module. 2750 */ 2751 2752 init_inodecache(); 2753 2754 err = register_filesystem(&sock_fs_type); 2755 if (err) 2756 goto out_fs; 2757 sock_mnt = kern_mount(&sock_fs_type); 2758 if (IS_ERR(sock_mnt)) { 2759 err = PTR_ERR(sock_mnt); 2760 goto out_mount; 2761 } 2762 2763 /* The real protocol initialization is performed in later initcalls. 2764 */ 2765 2766 #ifdef CONFIG_NETFILTER 2767 err = netfilter_init(); 2768 if (err) 2769 goto out; 2770 #endif 2771 2772 ptp_classifier_init(); 2773 2774 out: 2775 return err; 2776 2777 out_mount: 2778 unregister_filesystem(&sock_fs_type); 2779 out_fs: 2780 goto out; 2781 } 2782 2783 core_initcall(sock_init); /* early initcall */ 2784 2785 #ifdef CONFIG_PROC_FS 2786 void socket_seq_show(struct seq_file *seq) 2787 { 2788 seq_printf(seq, "sockets: used %d\n", 2789 sock_inuse_get(seq->private)); 2790 } 2791 #endif /* CONFIG_PROC_FS */ 2792 2793 #ifdef CONFIG_COMPAT 2794 static int do_siocgstamp(struct net *net, struct socket *sock, 2795 unsigned int cmd, void __user *up) 2796 { 2797 mm_segment_t old_fs = get_fs(); 2798 struct timeval ktv; 2799 int err; 2800 2801 set_fs(KERNEL_DS); 2802 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv, 2803 sizeof(struct compat_ifreq)); 2804 set_fs(old_fs); 2805 if (!err) 2806 err = compat_put_timeval(&ktv, up); 2807 2808 return err; 2809 } 2810 2811 static int do_siocgstampns(struct net *net, struct socket *sock, 2812 unsigned int cmd, void __user *up) 2813 { 2814 mm_segment_t old_fs = get_fs(); 2815 struct timespec kts; 2816 int err; 2817 2818 set_fs(KERNEL_DS); 2819 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts, 2820 sizeof(struct compat_ifreq)); 2821 set_fs(old_fs); 2822 if (!err) 2823 err = compat_put_timespec(&kts, up); 2824 2825 return err; 2826 } 2827 2828 static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2829 { 2830 struct compat_ifconf ifc32; 2831 struct ifconf ifc; 2832 int err; 2833 2834 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2835 return -EFAULT; 2836 2837 ifc.ifc_len = ifc32.ifc_len; 2838 ifc.ifc_req = compat_ptr(ifc32.ifcbuf); 2839 2840 rtnl_lock(); 2841 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); 2842 rtnl_unlock(); 2843 if (err) 2844 return err; 2845 2846 ifc32.ifc_len = ifc.ifc_len; 2847 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2848 return -EFAULT; 2849 2850 return 0; 2851 } 2852 2853 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2854 { 2855 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2856 bool convert_in = false, convert_out = false; 2857 size_t buf_size = 0; 2858 struct ethtool_rxnfc __user *rxnfc = NULL; 2859 struct ifreq ifr; 2860 u32 rule_cnt = 0, actual_rule_cnt; 2861 u32 ethcmd; 2862 u32 data; 2863 int ret; 2864 2865 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2866 return -EFAULT; 2867 2868 compat_rxnfc = compat_ptr(data); 2869 2870 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2871 return -EFAULT; 2872 2873 /* Most ethtool structures are defined without padding. 2874 * Unfortunately struct ethtool_rxnfc is an exception. 2875 */ 2876 switch (ethcmd) { 2877 default: 2878 break; 2879 case ETHTOOL_GRXCLSRLALL: 2880 /* Buffer size is variable */ 2881 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2882 return -EFAULT; 2883 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2884 return -ENOMEM; 2885 buf_size += rule_cnt * sizeof(u32); 2886 /* fall through */ 2887 case ETHTOOL_GRXRINGS: 2888 case ETHTOOL_GRXCLSRLCNT: 2889 case ETHTOOL_GRXCLSRULE: 2890 case ETHTOOL_SRXCLSRLINS: 2891 convert_out = true; 2892 /* fall through */ 2893 case ETHTOOL_SRXCLSRLDEL: 2894 buf_size += sizeof(struct ethtool_rxnfc); 2895 convert_in = true; 2896 rxnfc = compat_alloc_user_space(buf_size); 2897 break; 2898 } 2899 2900 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2901 return -EFAULT; 2902 2903 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; 2904 2905 if (convert_in) { 2906 /* We expect there to be holes between fs.m_ext and 2907 * fs.ring_cookie and at the end of fs, but nowhere else. 2908 */ 2909 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2910 sizeof(compat_rxnfc->fs.m_ext) != 2911 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2912 sizeof(rxnfc->fs.m_ext)); 2913 BUILD_BUG_ON( 2914 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2915 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2916 offsetof(struct ethtool_rxnfc, fs.location) - 2917 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2918 2919 if (copy_in_user(rxnfc, compat_rxnfc, 2920 (void __user *)(&rxnfc->fs.m_ext + 1) - 2921 (void __user *)rxnfc) || 2922 copy_in_user(&rxnfc->fs.ring_cookie, 2923 &compat_rxnfc->fs.ring_cookie, 2924 (void __user *)(&rxnfc->fs.location + 1) - 2925 (void __user *)&rxnfc->fs.ring_cookie)) 2926 return -EFAULT; 2927 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2928 if (put_user(rule_cnt, &rxnfc->rule_cnt)) 2929 return -EFAULT; 2930 } else if (copy_in_user(&rxnfc->rule_cnt, 2931 &compat_rxnfc->rule_cnt, 2932 sizeof(rxnfc->rule_cnt))) 2933 return -EFAULT; 2934 } 2935 2936 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); 2937 if (ret) 2938 return ret; 2939 2940 if (convert_out) { 2941 if (copy_in_user(compat_rxnfc, rxnfc, 2942 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2943 (const void __user *)rxnfc) || 2944 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2945 &rxnfc->fs.ring_cookie, 2946 (const void __user *)(&rxnfc->fs.location + 1) - 2947 (const void __user *)&rxnfc->fs.ring_cookie) || 2948 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2949 sizeof(rxnfc->rule_cnt))) 2950 return -EFAULT; 2951 2952 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2953 /* As an optimisation, we only copy the actual 2954 * number of rules that the underlying 2955 * function returned. Since Mallory might 2956 * change the rule count in user memory, we 2957 * check that it is less than the rule count 2958 * originally given (as the user buffer size), 2959 * which has been range-checked. 2960 */ 2961 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2962 return -EFAULT; 2963 if (actual_rule_cnt < rule_cnt) 2964 rule_cnt = actual_rule_cnt; 2965 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2966 &rxnfc->rule_locs[0], 2967 rule_cnt * sizeof(u32))) 2968 return -EFAULT; 2969 } 2970 } 2971 2972 return 0; 2973 } 2974 2975 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2976 { 2977 compat_uptr_t uptr32; 2978 struct ifreq ifr; 2979 void __user *saved; 2980 int err; 2981 2982 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) 2983 return -EFAULT; 2984 2985 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2986 return -EFAULT; 2987 2988 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; 2989 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); 2990 2991 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); 2992 if (!err) { 2993 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; 2994 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) 2995 err = -EFAULT; 2996 } 2997 return err; 2998 } 2999 3000 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 3001 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 3002 struct compat_ifreq __user *u_ifreq32) 3003 { 3004 struct ifreq ifreq; 3005 u32 data32; 3006 3007 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) 3008 return -EFAULT; 3009 if (get_user(data32, &u_ifreq32->ifr_data)) 3010 return -EFAULT; 3011 ifreq.ifr_data = compat_ptr(data32); 3012 3013 return dev_ioctl(net, cmd, &ifreq, NULL); 3014 } 3015 3016 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 3017 struct compat_ifreq __user *uifr32) 3018 { 3019 struct ifreq ifr; 3020 struct compat_ifmap __user *uifmap32; 3021 int err; 3022 3023 uifmap32 = &uifr32->ifr_ifru.ifru_map; 3024 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 3025 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3026 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3027 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3028 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 3029 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 3030 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 3031 if (err) 3032 return -EFAULT; 3033 3034 err = dev_ioctl(net, cmd, &ifr, NULL); 3035 3036 if (cmd == SIOCGIFMAP && !err) { 3037 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3038 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3039 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3040 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3041 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3042 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3043 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3044 if (err) 3045 err = -EFAULT; 3046 } 3047 return err; 3048 } 3049 3050 struct rtentry32 { 3051 u32 rt_pad1; 3052 struct sockaddr rt_dst; /* target address */ 3053 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3054 struct sockaddr rt_genmask; /* target network mask (IP) */ 3055 unsigned short rt_flags; 3056 short rt_pad2; 3057 u32 rt_pad3; 3058 unsigned char rt_tos; 3059 unsigned char rt_class; 3060 short rt_pad4; 3061 short rt_metric; /* +1 for binary compatibility! */ 3062 /* char * */ u32 rt_dev; /* forcing the device at add */ 3063 u32 rt_mtu; /* per route MTU/Window */ 3064 u32 rt_window; /* Window clamping */ 3065 unsigned short rt_irtt; /* Initial RTT */ 3066 }; 3067 3068 struct in6_rtmsg32 { 3069 struct in6_addr rtmsg_dst; 3070 struct in6_addr rtmsg_src; 3071 struct in6_addr rtmsg_gateway; 3072 u32 rtmsg_type; 3073 u16 rtmsg_dst_len; 3074 u16 rtmsg_src_len; 3075 u32 rtmsg_metric; 3076 u32 rtmsg_info; 3077 u32 rtmsg_flags; 3078 s32 rtmsg_ifindex; 3079 }; 3080 3081 static int routing_ioctl(struct net *net, struct socket *sock, 3082 unsigned int cmd, void __user *argp) 3083 { 3084 int ret; 3085 void *r = NULL; 3086 struct in6_rtmsg r6; 3087 struct rtentry r4; 3088 char devname[16]; 3089 u32 rtdev; 3090 mm_segment_t old_fs = get_fs(); 3091 3092 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3093 struct in6_rtmsg32 __user *ur6 = argp; 3094 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3095 3 * sizeof(struct in6_addr)); 3096 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3097 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3098 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3099 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3100 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3101 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3102 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3103 3104 r = (void *) &r6; 3105 } else { /* ipv4 */ 3106 struct rtentry32 __user *ur4 = argp; 3107 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3108 3 * sizeof(struct sockaddr)); 3109 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3110 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3111 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3112 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3113 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3114 ret |= get_user(rtdev, &(ur4->rt_dev)); 3115 if (rtdev) { 3116 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3117 r4.rt_dev = (char __user __force *)devname; 3118 devname[15] = 0; 3119 } else 3120 r4.rt_dev = NULL; 3121 3122 r = (void *) &r4; 3123 } 3124 3125 if (ret) { 3126 ret = -EFAULT; 3127 goto out; 3128 } 3129 3130 set_fs(KERNEL_DS); 3131 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r, 3132 sizeof(struct compat_ifreq)); 3133 set_fs(old_fs); 3134 3135 out: 3136 return ret; 3137 } 3138 3139 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3140 * for some operations; this forces use of the newer bridge-utils that 3141 * use compatible ioctls 3142 */ 3143 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3144 { 3145 compat_ulong_t tmp; 3146 3147 if (get_user(tmp, argp)) 3148 return -EFAULT; 3149 if (tmp == BRCTL_GET_VERSION) 3150 return BRCTL_VERSION + 1; 3151 return -EINVAL; 3152 } 3153 3154 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3155 unsigned int cmd, unsigned long arg) 3156 { 3157 void __user *argp = compat_ptr(arg); 3158 struct sock *sk = sock->sk; 3159 struct net *net = sock_net(sk); 3160 3161 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3162 return compat_ifr_data_ioctl(net, cmd, argp); 3163 3164 switch (cmd) { 3165 case SIOCSIFBR: 3166 case SIOCGIFBR: 3167 return old_bridge_ioctl(argp); 3168 case SIOCGIFCONF: 3169 return compat_dev_ifconf(net, argp); 3170 case SIOCETHTOOL: 3171 return ethtool_ioctl(net, argp); 3172 case SIOCWANDEV: 3173 return compat_siocwandev(net, argp); 3174 case SIOCGIFMAP: 3175 case SIOCSIFMAP: 3176 return compat_sioc_ifmap(net, cmd, argp); 3177 case SIOCADDRT: 3178 case SIOCDELRT: 3179 return routing_ioctl(net, sock, cmd, argp); 3180 case SIOCGSTAMP: 3181 return do_siocgstamp(net, sock, cmd, argp); 3182 case SIOCGSTAMPNS: 3183 return do_siocgstampns(net, sock, cmd, argp); 3184 case SIOCBONDSLAVEINFOQUERY: 3185 case SIOCBONDINFOQUERY: 3186 case SIOCSHWTSTAMP: 3187 case SIOCGHWTSTAMP: 3188 return compat_ifr_data_ioctl(net, cmd, argp); 3189 3190 case FIOSETOWN: 3191 case SIOCSPGRP: 3192 case FIOGETOWN: 3193 case SIOCGPGRP: 3194 case SIOCBRADDBR: 3195 case SIOCBRDELBR: 3196 case SIOCGIFVLAN: 3197 case SIOCSIFVLAN: 3198 case SIOCADDDLCI: 3199 case SIOCDELDLCI: 3200 case SIOCGSKNS: 3201 return sock_ioctl(file, cmd, arg); 3202 3203 case SIOCGIFFLAGS: 3204 case SIOCSIFFLAGS: 3205 case SIOCGIFMETRIC: 3206 case SIOCSIFMETRIC: 3207 case SIOCGIFMTU: 3208 case SIOCSIFMTU: 3209 case SIOCGIFMEM: 3210 case SIOCSIFMEM: 3211 case SIOCGIFHWADDR: 3212 case SIOCSIFHWADDR: 3213 case SIOCADDMULTI: 3214 case SIOCDELMULTI: 3215 case SIOCGIFINDEX: 3216 case SIOCGIFADDR: 3217 case SIOCSIFADDR: 3218 case SIOCSIFHWBROADCAST: 3219 case SIOCDIFADDR: 3220 case SIOCGIFBRDADDR: 3221 case SIOCSIFBRDADDR: 3222 case SIOCGIFDSTADDR: 3223 case SIOCSIFDSTADDR: 3224 case SIOCGIFNETMASK: 3225 case SIOCSIFNETMASK: 3226 case SIOCSIFPFLAGS: 3227 case SIOCGIFPFLAGS: 3228 case SIOCGIFTXQLEN: 3229 case SIOCSIFTXQLEN: 3230 case SIOCBRADDIF: 3231 case SIOCBRDELIF: 3232 case SIOCSIFNAME: 3233 case SIOCGMIIPHY: 3234 case SIOCGMIIREG: 3235 case SIOCSMIIREG: 3236 case SIOCSARP: 3237 case SIOCGARP: 3238 case SIOCDARP: 3239 case SIOCATMARK: 3240 case SIOCBONDENSLAVE: 3241 case SIOCBONDRELEASE: 3242 case SIOCBONDSETHWADDR: 3243 case SIOCBONDCHANGEACTIVE: 3244 case SIOCGIFNAME: 3245 return sock_do_ioctl(net, sock, cmd, arg, 3246 sizeof(struct compat_ifreq)); 3247 } 3248 3249 return -ENOIOCTLCMD; 3250 } 3251 3252 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3253 unsigned long arg) 3254 { 3255 struct socket *sock = file->private_data; 3256 int ret = -ENOIOCTLCMD; 3257 struct sock *sk; 3258 struct net *net; 3259 3260 sk = sock->sk; 3261 net = sock_net(sk); 3262 3263 if (sock->ops->compat_ioctl) 3264 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3265 3266 if (ret == -ENOIOCTLCMD && 3267 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3268 ret = compat_wext_handle_ioctl(net, cmd, arg); 3269 3270 if (ret == -ENOIOCTLCMD) 3271 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3272 3273 return ret; 3274 } 3275 #endif 3276 3277 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3278 { 3279 return sock->ops->bind(sock, addr, addrlen); 3280 } 3281 EXPORT_SYMBOL(kernel_bind); 3282 3283 int kernel_listen(struct socket *sock, int backlog) 3284 { 3285 return sock->ops->listen(sock, backlog); 3286 } 3287 EXPORT_SYMBOL(kernel_listen); 3288 3289 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3290 { 3291 struct sock *sk = sock->sk; 3292 int err; 3293 3294 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3295 newsock); 3296 if (err < 0) 3297 goto done; 3298 3299 err = sock->ops->accept(sock, *newsock, flags, true); 3300 if (err < 0) { 3301 sock_release(*newsock); 3302 *newsock = NULL; 3303 goto done; 3304 } 3305 3306 (*newsock)->ops = sock->ops; 3307 __module_get((*newsock)->ops->owner); 3308 3309 done: 3310 return err; 3311 } 3312 EXPORT_SYMBOL(kernel_accept); 3313 3314 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3315 int flags) 3316 { 3317 return sock->ops->connect(sock, addr, addrlen, flags); 3318 } 3319 EXPORT_SYMBOL(kernel_connect); 3320 3321 int kernel_getsockname(struct socket *sock, struct sockaddr *addr) 3322 { 3323 return sock->ops->getname(sock, addr, 0); 3324 } 3325 EXPORT_SYMBOL(kernel_getsockname); 3326 3327 int kernel_getpeername(struct socket *sock, struct sockaddr *addr) 3328 { 3329 return sock->ops->getname(sock, addr, 1); 3330 } 3331 EXPORT_SYMBOL(kernel_getpeername); 3332 3333 int kernel_getsockopt(struct socket *sock, int level, int optname, 3334 char *optval, int *optlen) 3335 { 3336 mm_segment_t oldfs = get_fs(); 3337 char __user *uoptval; 3338 int __user *uoptlen; 3339 int err; 3340 3341 uoptval = (char __user __force *) optval; 3342 uoptlen = (int __user __force *) optlen; 3343 3344 set_fs(KERNEL_DS); 3345 if (level == SOL_SOCKET) 3346 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3347 else 3348 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3349 uoptlen); 3350 set_fs(oldfs); 3351 return err; 3352 } 3353 EXPORT_SYMBOL(kernel_getsockopt); 3354 3355 int kernel_setsockopt(struct socket *sock, int level, int optname, 3356 char *optval, unsigned int optlen) 3357 { 3358 mm_segment_t oldfs = get_fs(); 3359 char __user *uoptval; 3360 int err; 3361 3362 uoptval = (char __user __force *) optval; 3363 3364 set_fs(KERNEL_DS); 3365 if (level == SOL_SOCKET) 3366 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3367 else 3368 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3369 optlen); 3370 set_fs(oldfs); 3371 return err; 3372 } 3373 EXPORT_SYMBOL(kernel_setsockopt); 3374 3375 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3376 size_t size, int flags) 3377 { 3378 if (sock->ops->sendpage) 3379 return sock->ops->sendpage(sock, page, offset, size, flags); 3380 3381 return sock_no_sendpage(sock, page, offset, size, flags); 3382 } 3383 EXPORT_SYMBOL(kernel_sendpage); 3384 3385 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3386 size_t size, int flags) 3387 { 3388 struct socket *sock = sk->sk_socket; 3389 3390 if (sock->ops->sendpage_locked) 3391 return sock->ops->sendpage_locked(sk, page, offset, size, 3392 flags); 3393 3394 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3395 } 3396 EXPORT_SYMBOL(kernel_sendpage_locked); 3397 3398 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3399 { 3400 return sock->ops->shutdown(sock, how); 3401 } 3402 EXPORT_SYMBOL(kernel_sock_shutdown); 3403 3404 /* This routine returns the IP overhead imposed by a socket i.e. 3405 * the length of the underlying IP header, depending on whether 3406 * this is an IPv4 or IPv6 socket and the length from IP options turned 3407 * on at the socket. Assumes that the caller has a lock on the socket. 3408 */ 3409 u32 kernel_sock_ip_overhead(struct sock *sk) 3410 { 3411 struct inet_sock *inet; 3412 struct ip_options_rcu *opt; 3413 u32 overhead = 0; 3414 #if IS_ENABLED(CONFIG_IPV6) 3415 struct ipv6_pinfo *np; 3416 struct ipv6_txoptions *optv6 = NULL; 3417 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3418 3419 if (!sk) 3420 return overhead; 3421 3422 switch (sk->sk_family) { 3423 case AF_INET: 3424 inet = inet_sk(sk); 3425 overhead += sizeof(struct iphdr); 3426 opt = rcu_dereference_protected(inet->inet_opt, 3427 sock_owned_by_user(sk)); 3428 if (opt) 3429 overhead += opt->opt.optlen; 3430 return overhead; 3431 #if IS_ENABLED(CONFIG_IPV6) 3432 case AF_INET6: 3433 np = inet6_sk(sk); 3434 overhead += sizeof(struct ipv6hdr); 3435 if (np) 3436 optv6 = rcu_dereference_protected(np->opt, 3437 sock_owned_by_user(sk)); 3438 if (optv6) 3439 overhead += (optv6->opt_flen + optv6->opt_nflen); 3440 return overhead; 3441 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3442 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3443 return overhead; 3444 } 3445 } 3446 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3447