1 /* 2 * NET An implementation of the SOCKET network access protocol. 3 * 4 * Version: @(#)socket.c 1.1.93 18/02/95 5 * 6 * Authors: Orest Zborowski, <obz@Kodak.COM> 7 * Ross Biro 8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 9 * 10 * Fixes: 11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in 12 * shutdown() 13 * Alan Cox : verify_area() fixes 14 * Alan Cox : Removed DDI 15 * Jonathan Kamens : SOCK_DGRAM reconnect bug 16 * Alan Cox : Moved a load of checks to the very 17 * top level. 18 * Alan Cox : Move address structures to/from user 19 * mode above the protocol layers. 20 * Rob Janssen : Allow 0 length sends. 21 * Alan Cox : Asynchronous I/O support (cribbed from the 22 * tty drivers). 23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 24 * Jeff Uphoff : Made max number of sockets command-line 25 * configurable. 26 * Matti Aarnio : Made the number of sockets dynamic, 27 * to be allocated when needed, and mr. 28 * Uphoff's max is used as max to be 29 * allowed to allocate. 30 * Linus : Argh. removed all the socket allocation 31 * altogether: it's in the inode now. 32 * Alan Cox : Made sock_alloc()/sock_release() public 33 * for NetROM and future kernel nfsd type 34 * stuff. 35 * Alan Cox : sendmsg/recvmsg basics. 36 * Tom Dyas : Export net symbols. 37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 38 * Alan Cox : Added thread locking to sys_* calls 39 * for sockets. May have errors at the 40 * moment. 41 * Kevin Buhr : Fixed the dumb errors in the above. 42 * Andi Kleen : Some small cleanups, optimizations, 43 * and fixed a copy_from_user() bug. 44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 45 * Tigran Aivazian : Made listen(2) backlog sanity checks 46 * protocol-independent 47 * 48 * 49 * This program is free software; you can redistribute it and/or 50 * modify it under the terms of the GNU General Public License 51 * as published by the Free Software Foundation; either version 52 * 2 of the License, or (at your option) any later version. 53 * 54 * 55 * This module is effectively the top level interface to the BSD socket 56 * paradigm. 57 * 58 * Based upon Swansea University Computer Society NET3.039 59 */ 60 61 #include <linux/mm.h> 62 #include <linux/socket.h> 63 #include <linux/file.h> 64 #include <linux/net.h> 65 #include <linux/interrupt.h> 66 #include <linux/thread_info.h> 67 #include <linux/rcupdate.h> 68 #include <linux/netdevice.h> 69 #include <linux/proc_fs.h> 70 #include <linux/seq_file.h> 71 #include <linux/mutex.h> 72 #include <linux/if_bridge.h> 73 #include <linux/if_frad.h> 74 #include <linux/if_vlan.h> 75 #include <linux/ptp_classify.h> 76 #include <linux/init.h> 77 #include <linux/poll.h> 78 #include <linux/cache.h> 79 #include <linux/module.h> 80 #include <linux/highmem.h> 81 #include <linux/mount.h> 82 #include <linux/security.h> 83 #include <linux/syscalls.h> 84 #include <linux/compat.h> 85 #include <linux/kmod.h> 86 #include <linux/audit.h> 87 #include <linux/wireless.h> 88 #include <linux/nsproxy.h> 89 #include <linux/magic.h> 90 #include <linux/slab.h> 91 #include <linux/xattr.h> 92 93 #include <linux/uaccess.h> 94 #include <asm/unistd.h> 95 96 #include <net/compat.h> 97 #include <net/wext.h> 98 #include <net/cls_cgroup.h> 99 100 #include <net/sock.h> 101 #include <linux/netfilter.h> 102 103 #include <linux/if_tun.h> 104 #include <linux/ipv6_route.h> 105 #include <linux/route.h> 106 #include <linux/sockios.h> 107 #include <net/busy_poll.h> 108 #include <linux/errqueue.h> 109 110 #ifdef CONFIG_NET_RX_BUSY_POLL 111 unsigned int sysctl_net_busy_read __read_mostly; 112 unsigned int sysctl_net_busy_poll __read_mostly; 113 #endif 114 115 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 116 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 117 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 118 119 static int sock_close(struct inode *inode, struct file *file); 120 static struct wait_queue_head *sock_get_poll_head(struct file *file, 121 __poll_t events); 122 static __poll_t sock_poll_mask(struct file *file, __poll_t); 123 static __poll_t sock_poll(struct file *file, struct poll_table_struct *wait); 124 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 125 #ifdef CONFIG_COMPAT 126 static long compat_sock_ioctl(struct file *file, 127 unsigned int cmd, unsigned long arg); 128 #endif 129 static int sock_fasync(int fd, struct file *filp, int on); 130 static ssize_t sock_sendpage(struct file *file, struct page *page, 131 int offset, size_t size, loff_t *ppos, int more); 132 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 133 struct pipe_inode_info *pipe, size_t len, 134 unsigned int flags); 135 136 /* 137 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 138 * in the operation structures but are done directly via the socketcall() multiplexor. 139 */ 140 141 static const struct file_operations socket_file_ops = { 142 .owner = THIS_MODULE, 143 .llseek = no_llseek, 144 .read_iter = sock_read_iter, 145 .write_iter = sock_write_iter, 146 .get_poll_head = sock_get_poll_head, 147 .poll_mask = sock_poll_mask, 148 .poll = sock_poll, 149 .unlocked_ioctl = sock_ioctl, 150 #ifdef CONFIG_COMPAT 151 .compat_ioctl = compat_sock_ioctl, 152 #endif 153 .mmap = sock_mmap, 154 .release = sock_close, 155 .fasync = sock_fasync, 156 .sendpage = sock_sendpage, 157 .splice_write = generic_splice_sendpage, 158 .splice_read = sock_splice_read, 159 }; 160 161 /* 162 * The protocol list. Each protocol is registered in here. 163 */ 164 165 static DEFINE_SPINLOCK(net_family_lock); 166 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 167 168 /* 169 * Support routines. 170 * Move socket addresses back and forth across the kernel/user 171 * divide and look after the messy bits. 172 */ 173 174 /** 175 * move_addr_to_kernel - copy a socket address into kernel space 176 * @uaddr: Address in user space 177 * @kaddr: Address in kernel space 178 * @ulen: Length in user space 179 * 180 * The address is copied into kernel space. If the provided address is 181 * too long an error code of -EINVAL is returned. If the copy gives 182 * invalid addresses -EFAULT is returned. On a success 0 is returned. 183 */ 184 185 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 186 { 187 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 188 return -EINVAL; 189 if (ulen == 0) 190 return 0; 191 if (copy_from_user(kaddr, uaddr, ulen)) 192 return -EFAULT; 193 return audit_sockaddr(ulen, kaddr); 194 } 195 196 /** 197 * move_addr_to_user - copy an address to user space 198 * @kaddr: kernel space address 199 * @klen: length of address in kernel 200 * @uaddr: user space address 201 * @ulen: pointer to user length field 202 * 203 * The value pointed to by ulen on entry is the buffer length available. 204 * This is overwritten with the buffer space used. -EINVAL is returned 205 * if an overlong buffer is specified or a negative buffer size. -EFAULT 206 * is returned if either the buffer or the length field are not 207 * accessible. 208 * After copying the data up to the limit the user specifies, the true 209 * length of the data is written over the length limit the user 210 * specified. Zero is returned for a success. 211 */ 212 213 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 214 void __user *uaddr, int __user *ulen) 215 { 216 int err; 217 int len; 218 219 BUG_ON(klen > sizeof(struct sockaddr_storage)); 220 err = get_user(len, ulen); 221 if (err) 222 return err; 223 if (len > klen) 224 len = klen; 225 if (len < 0) 226 return -EINVAL; 227 if (len) { 228 if (audit_sockaddr(klen, kaddr)) 229 return -ENOMEM; 230 if (copy_to_user(uaddr, kaddr, len)) 231 return -EFAULT; 232 } 233 /* 234 * "fromlen shall refer to the value before truncation.." 235 * 1003.1g 236 */ 237 return __put_user(klen, ulen); 238 } 239 240 static struct kmem_cache *sock_inode_cachep __ro_after_init; 241 242 static struct inode *sock_alloc_inode(struct super_block *sb) 243 { 244 struct socket_alloc *ei; 245 struct socket_wq *wq; 246 247 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 248 if (!ei) 249 return NULL; 250 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 251 if (!wq) { 252 kmem_cache_free(sock_inode_cachep, ei); 253 return NULL; 254 } 255 init_waitqueue_head(&wq->wait); 256 wq->fasync_list = NULL; 257 wq->flags = 0; 258 RCU_INIT_POINTER(ei->socket.wq, wq); 259 260 ei->socket.state = SS_UNCONNECTED; 261 ei->socket.flags = 0; 262 ei->socket.ops = NULL; 263 ei->socket.sk = NULL; 264 ei->socket.file = NULL; 265 266 return &ei->vfs_inode; 267 } 268 269 static void sock_destroy_inode(struct inode *inode) 270 { 271 struct socket_alloc *ei; 272 struct socket_wq *wq; 273 274 ei = container_of(inode, struct socket_alloc, vfs_inode); 275 wq = rcu_dereference_protected(ei->socket.wq, 1); 276 kfree_rcu(wq, rcu); 277 kmem_cache_free(sock_inode_cachep, ei); 278 } 279 280 static void init_once(void *foo) 281 { 282 struct socket_alloc *ei = (struct socket_alloc *)foo; 283 284 inode_init_once(&ei->vfs_inode); 285 } 286 287 static void init_inodecache(void) 288 { 289 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 290 sizeof(struct socket_alloc), 291 0, 292 (SLAB_HWCACHE_ALIGN | 293 SLAB_RECLAIM_ACCOUNT | 294 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 295 init_once); 296 BUG_ON(sock_inode_cachep == NULL); 297 } 298 299 static const struct super_operations sockfs_ops = { 300 .alloc_inode = sock_alloc_inode, 301 .destroy_inode = sock_destroy_inode, 302 .statfs = simple_statfs, 303 }; 304 305 /* 306 * sockfs_dname() is called from d_path(). 307 */ 308 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 309 { 310 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 311 d_inode(dentry)->i_ino); 312 } 313 314 static const struct dentry_operations sockfs_dentry_operations = { 315 .d_dname = sockfs_dname, 316 }; 317 318 static int sockfs_xattr_get(const struct xattr_handler *handler, 319 struct dentry *dentry, struct inode *inode, 320 const char *suffix, void *value, size_t size) 321 { 322 if (value) { 323 if (dentry->d_name.len + 1 > size) 324 return -ERANGE; 325 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 326 } 327 return dentry->d_name.len + 1; 328 } 329 330 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 331 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 332 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 333 334 static const struct xattr_handler sockfs_xattr_handler = { 335 .name = XATTR_NAME_SOCKPROTONAME, 336 .get = sockfs_xattr_get, 337 }; 338 339 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 340 struct dentry *dentry, struct inode *inode, 341 const char *suffix, const void *value, 342 size_t size, int flags) 343 { 344 /* Handled by LSM. */ 345 return -EAGAIN; 346 } 347 348 static const struct xattr_handler sockfs_security_xattr_handler = { 349 .prefix = XATTR_SECURITY_PREFIX, 350 .set = sockfs_security_xattr_set, 351 }; 352 353 static const struct xattr_handler *sockfs_xattr_handlers[] = { 354 &sockfs_xattr_handler, 355 &sockfs_security_xattr_handler, 356 NULL 357 }; 358 359 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 360 int flags, const char *dev_name, void *data) 361 { 362 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 363 sockfs_xattr_handlers, 364 &sockfs_dentry_operations, SOCKFS_MAGIC); 365 } 366 367 static struct vfsmount *sock_mnt __read_mostly; 368 369 static struct file_system_type sock_fs_type = { 370 .name = "sockfs", 371 .mount = sockfs_mount, 372 .kill_sb = kill_anon_super, 373 }; 374 375 /* 376 * Obtains the first available file descriptor and sets it up for use. 377 * 378 * These functions create file structures and maps them to fd space 379 * of the current process. On success it returns file descriptor 380 * and file struct implicitly stored in sock->file. 381 * Note that another thread may close file descriptor before we return 382 * from this function. We use the fact that now we do not refer 383 * to socket after mapping. If one day we will need it, this 384 * function will increment ref. count on file by 1. 385 * 386 * In any case returned fd MAY BE not valid! 387 * This race condition is unavoidable 388 * with shared fd spaces, we cannot solve it inside kernel, 389 * but we take care of internal coherence yet. 390 */ 391 392 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 393 { 394 struct file *file; 395 396 if (!dname) 397 dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; 398 399 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, 400 O_RDWR | (flags & O_NONBLOCK), 401 &socket_file_ops); 402 if (IS_ERR(file)) { 403 sock_release(sock); 404 return file; 405 } 406 407 sock->file = file; 408 file->private_data = sock; 409 return file; 410 } 411 EXPORT_SYMBOL(sock_alloc_file); 412 413 static int sock_map_fd(struct socket *sock, int flags) 414 { 415 struct file *newfile; 416 int fd = get_unused_fd_flags(flags); 417 if (unlikely(fd < 0)) { 418 sock_release(sock); 419 return fd; 420 } 421 422 newfile = sock_alloc_file(sock, flags, NULL); 423 if (likely(!IS_ERR(newfile))) { 424 fd_install(fd, newfile); 425 return fd; 426 } 427 428 put_unused_fd(fd); 429 return PTR_ERR(newfile); 430 } 431 432 struct socket *sock_from_file(struct file *file, int *err) 433 { 434 if (file->f_op == &socket_file_ops) 435 return file->private_data; /* set in sock_map_fd */ 436 437 *err = -ENOTSOCK; 438 return NULL; 439 } 440 EXPORT_SYMBOL(sock_from_file); 441 442 /** 443 * sockfd_lookup - Go from a file number to its socket slot 444 * @fd: file handle 445 * @err: pointer to an error code return 446 * 447 * The file handle passed in is locked and the socket it is bound 448 * to is returned. If an error occurs the err pointer is overwritten 449 * with a negative errno code and NULL is returned. The function checks 450 * for both invalid handles and passing a handle which is not a socket. 451 * 452 * On a success the socket object pointer is returned. 453 */ 454 455 struct socket *sockfd_lookup(int fd, int *err) 456 { 457 struct file *file; 458 struct socket *sock; 459 460 file = fget(fd); 461 if (!file) { 462 *err = -EBADF; 463 return NULL; 464 } 465 466 sock = sock_from_file(file, err); 467 if (!sock) 468 fput(file); 469 return sock; 470 } 471 EXPORT_SYMBOL(sockfd_lookup); 472 473 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 474 { 475 struct fd f = fdget(fd); 476 struct socket *sock; 477 478 *err = -EBADF; 479 if (f.file) { 480 sock = sock_from_file(f.file, err); 481 if (likely(sock)) { 482 *fput_needed = f.flags; 483 return sock; 484 } 485 fdput(f); 486 } 487 return NULL; 488 } 489 490 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 491 size_t size) 492 { 493 ssize_t len; 494 ssize_t used = 0; 495 496 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 497 if (len < 0) 498 return len; 499 used += len; 500 if (buffer) { 501 if (size < used) 502 return -ERANGE; 503 buffer += len; 504 } 505 506 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 507 used += len; 508 if (buffer) { 509 if (size < used) 510 return -ERANGE; 511 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 512 buffer += len; 513 } 514 515 return used; 516 } 517 518 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 519 { 520 int err = simple_setattr(dentry, iattr); 521 522 if (!err && (iattr->ia_valid & ATTR_UID)) { 523 struct socket *sock = SOCKET_I(d_inode(dentry)); 524 525 if (sock->sk) 526 sock->sk->sk_uid = iattr->ia_uid; 527 else 528 err = -ENOENT; 529 } 530 531 return err; 532 } 533 534 static const struct inode_operations sockfs_inode_ops = { 535 .listxattr = sockfs_listxattr, 536 .setattr = sockfs_setattr, 537 }; 538 539 /** 540 * sock_alloc - allocate a socket 541 * 542 * Allocate a new inode and socket object. The two are bound together 543 * and initialised. The socket is then returned. If we are out of inodes 544 * NULL is returned. 545 */ 546 547 struct socket *sock_alloc(void) 548 { 549 struct inode *inode; 550 struct socket *sock; 551 552 inode = new_inode_pseudo(sock_mnt->mnt_sb); 553 if (!inode) 554 return NULL; 555 556 sock = SOCKET_I(inode); 557 558 inode->i_ino = get_next_ino(); 559 inode->i_mode = S_IFSOCK | S_IRWXUGO; 560 inode->i_uid = current_fsuid(); 561 inode->i_gid = current_fsgid(); 562 inode->i_op = &sockfs_inode_ops; 563 564 return sock; 565 } 566 EXPORT_SYMBOL(sock_alloc); 567 568 /** 569 * sock_release - close a socket 570 * @sock: socket to close 571 * 572 * The socket is released from the protocol stack if it has a release 573 * callback, and the inode is then released if the socket is bound to 574 * an inode not a file. 575 */ 576 577 static void __sock_release(struct socket *sock, struct inode *inode) 578 { 579 if (sock->ops) { 580 struct module *owner = sock->ops->owner; 581 582 if (inode) 583 inode_lock(inode); 584 sock->ops->release(sock); 585 if (inode) 586 inode_unlock(inode); 587 sock->ops = NULL; 588 module_put(owner); 589 } 590 591 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 592 pr_err("%s: fasync list not empty!\n", __func__); 593 594 if (!sock->file) { 595 iput(SOCK_INODE(sock)); 596 return; 597 } 598 sock->file = NULL; 599 } 600 601 void sock_release(struct socket *sock) 602 { 603 __sock_release(sock, NULL); 604 } 605 EXPORT_SYMBOL(sock_release); 606 607 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 608 { 609 u8 flags = *tx_flags; 610 611 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 612 flags |= SKBTX_HW_TSTAMP; 613 614 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 615 flags |= SKBTX_SW_TSTAMP; 616 617 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 618 flags |= SKBTX_SCHED_TSTAMP; 619 620 *tx_flags = flags; 621 } 622 EXPORT_SYMBOL(__sock_tx_timestamp); 623 624 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 625 { 626 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 627 BUG_ON(ret == -EIOCBQUEUED); 628 return ret; 629 } 630 631 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 632 { 633 int err = security_socket_sendmsg(sock, msg, 634 msg_data_left(msg)); 635 636 return err ?: sock_sendmsg_nosec(sock, msg); 637 } 638 EXPORT_SYMBOL(sock_sendmsg); 639 640 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 641 struct kvec *vec, size_t num, size_t size) 642 { 643 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 644 return sock_sendmsg(sock, msg); 645 } 646 EXPORT_SYMBOL(kernel_sendmsg); 647 648 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 649 struct kvec *vec, size_t num, size_t size) 650 { 651 struct socket *sock = sk->sk_socket; 652 653 if (!sock->ops->sendmsg_locked) 654 return sock_no_sendmsg_locked(sk, msg, size); 655 656 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 657 658 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 659 } 660 EXPORT_SYMBOL(kernel_sendmsg_locked); 661 662 static bool skb_is_err_queue(const struct sk_buff *skb) 663 { 664 /* pkt_type of skbs enqueued on the error queue are set to 665 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 666 * in recvmsg, since skbs received on a local socket will never 667 * have a pkt_type of PACKET_OUTGOING. 668 */ 669 return skb->pkt_type == PACKET_OUTGOING; 670 } 671 672 /* On transmit, software and hardware timestamps are returned independently. 673 * As the two skb clones share the hardware timestamp, which may be updated 674 * before the software timestamp is received, a hardware TX timestamp may be 675 * returned only if there is no software TX timestamp. Ignore false software 676 * timestamps, which may be made in the __sock_recv_timestamp() call when the 677 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a 678 * hardware timestamp. 679 */ 680 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 681 { 682 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 683 } 684 685 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 686 { 687 struct scm_ts_pktinfo ts_pktinfo; 688 struct net_device *orig_dev; 689 690 if (!skb_mac_header_was_set(skb)) 691 return; 692 693 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 694 695 rcu_read_lock(); 696 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 697 if (orig_dev) 698 ts_pktinfo.if_index = orig_dev->ifindex; 699 rcu_read_unlock(); 700 701 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 702 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 703 sizeof(ts_pktinfo), &ts_pktinfo); 704 } 705 706 /* 707 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 708 */ 709 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 710 struct sk_buff *skb) 711 { 712 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 713 struct scm_timestamping tss; 714 int empty = 1, false_tstamp = 0; 715 struct skb_shared_hwtstamps *shhwtstamps = 716 skb_hwtstamps(skb); 717 718 /* Race occurred between timestamp enabling and packet 719 receiving. Fill in the current time for now. */ 720 if (need_software_tstamp && skb->tstamp == 0) { 721 __net_timestamp(skb); 722 false_tstamp = 1; 723 } 724 725 if (need_software_tstamp) { 726 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 727 struct timeval tv; 728 skb_get_timestamp(skb, &tv); 729 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 730 sizeof(tv), &tv); 731 } else { 732 struct timespec ts; 733 skb_get_timestampns(skb, &ts); 734 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 735 sizeof(ts), &ts); 736 } 737 } 738 739 memset(&tss, 0, sizeof(tss)); 740 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 741 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 742 empty = 0; 743 if (shhwtstamps && 744 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 745 !skb_is_swtx_tstamp(skb, false_tstamp) && 746 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 747 empty = 0; 748 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 749 !skb_is_err_queue(skb)) 750 put_ts_pktinfo(msg, skb); 751 } 752 if (!empty) { 753 put_cmsg(msg, SOL_SOCKET, 754 SCM_TIMESTAMPING, sizeof(tss), &tss); 755 756 if (skb_is_err_queue(skb) && skb->len && 757 SKB_EXT_ERR(skb)->opt_stats) 758 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 759 skb->len, skb->data); 760 } 761 } 762 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 763 764 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 765 struct sk_buff *skb) 766 { 767 int ack; 768 769 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 770 return; 771 if (!skb->wifi_acked_valid) 772 return; 773 774 ack = skb->wifi_acked; 775 776 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 777 } 778 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 779 780 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 781 struct sk_buff *skb) 782 { 783 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 784 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 785 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 786 } 787 788 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 789 struct sk_buff *skb) 790 { 791 sock_recv_timestamp(msg, sk, skb); 792 sock_recv_drops(msg, sk, skb); 793 } 794 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 795 796 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 797 int flags) 798 { 799 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 800 } 801 802 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 803 { 804 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 805 806 return err ?: sock_recvmsg_nosec(sock, msg, flags); 807 } 808 EXPORT_SYMBOL(sock_recvmsg); 809 810 /** 811 * kernel_recvmsg - Receive a message from a socket (kernel space) 812 * @sock: The socket to receive the message from 813 * @msg: Received message 814 * @vec: Input s/g array for message data 815 * @num: Size of input s/g array 816 * @size: Number of bytes to read 817 * @flags: Message flags (MSG_DONTWAIT, etc...) 818 * 819 * On return the msg structure contains the scatter/gather array passed in the 820 * vec argument. The array is modified so that it consists of the unfilled 821 * portion of the original array. 822 * 823 * The returned value is the total number of bytes received, or an error. 824 */ 825 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 826 struct kvec *vec, size_t num, size_t size, int flags) 827 { 828 mm_segment_t oldfs = get_fs(); 829 int result; 830 831 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); 832 set_fs(KERNEL_DS); 833 result = sock_recvmsg(sock, msg, flags); 834 set_fs(oldfs); 835 return result; 836 } 837 EXPORT_SYMBOL(kernel_recvmsg); 838 839 static ssize_t sock_sendpage(struct file *file, struct page *page, 840 int offset, size_t size, loff_t *ppos, int more) 841 { 842 struct socket *sock; 843 int flags; 844 845 sock = file->private_data; 846 847 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 848 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 849 flags |= more; 850 851 return kernel_sendpage(sock, page, offset, size, flags); 852 } 853 854 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 855 struct pipe_inode_info *pipe, size_t len, 856 unsigned int flags) 857 { 858 struct socket *sock = file->private_data; 859 860 if (unlikely(!sock->ops->splice_read)) 861 return -EINVAL; 862 863 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 864 } 865 866 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 867 { 868 struct file *file = iocb->ki_filp; 869 struct socket *sock = file->private_data; 870 struct msghdr msg = {.msg_iter = *to, 871 .msg_iocb = iocb}; 872 ssize_t res; 873 874 if (file->f_flags & O_NONBLOCK) 875 msg.msg_flags = MSG_DONTWAIT; 876 877 if (iocb->ki_pos != 0) 878 return -ESPIPE; 879 880 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 881 return 0; 882 883 res = sock_recvmsg(sock, &msg, msg.msg_flags); 884 *to = msg.msg_iter; 885 return res; 886 } 887 888 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 889 { 890 struct file *file = iocb->ki_filp; 891 struct socket *sock = file->private_data; 892 struct msghdr msg = {.msg_iter = *from, 893 .msg_iocb = iocb}; 894 ssize_t res; 895 896 if (iocb->ki_pos != 0) 897 return -ESPIPE; 898 899 if (file->f_flags & O_NONBLOCK) 900 msg.msg_flags = MSG_DONTWAIT; 901 902 if (sock->type == SOCK_SEQPACKET) 903 msg.msg_flags |= MSG_EOR; 904 905 res = sock_sendmsg(sock, &msg); 906 *from = msg.msg_iter; 907 return res; 908 } 909 910 /* 911 * Atomic setting of ioctl hooks to avoid race 912 * with module unload. 913 */ 914 915 static DEFINE_MUTEX(br_ioctl_mutex); 916 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 917 918 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 919 { 920 mutex_lock(&br_ioctl_mutex); 921 br_ioctl_hook = hook; 922 mutex_unlock(&br_ioctl_mutex); 923 } 924 EXPORT_SYMBOL(brioctl_set); 925 926 static DEFINE_MUTEX(vlan_ioctl_mutex); 927 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 928 929 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 930 { 931 mutex_lock(&vlan_ioctl_mutex); 932 vlan_ioctl_hook = hook; 933 mutex_unlock(&vlan_ioctl_mutex); 934 } 935 EXPORT_SYMBOL(vlan_ioctl_set); 936 937 static DEFINE_MUTEX(dlci_ioctl_mutex); 938 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 939 940 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 941 { 942 mutex_lock(&dlci_ioctl_mutex); 943 dlci_ioctl_hook = hook; 944 mutex_unlock(&dlci_ioctl_mutex); 945 } 946 EXPORT_SYMBOL(dlci_ioctl_set); 947 948 static long sock_do_ioctl(struct net *net, struct socket *sock, 949 unsigned int cmd, unsigned long arg) 950 { 951 int err; 952 void __user *argp = (void __user *)arg; 953 954 err = sock->ops->ioctl(sock, cmd, arg); 955 956 /* 957 * If this ioctl is unknown try to hand it down 958 * to the NIC driver. 959 */ 960 if (err != -ENOIOCTLCMD) 961 return err; 962 963 if (cmd == SIOCGIFCONF) { 964 struct ifconf ifc; 965 if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) 966 return -EFAULT; 967 rtnl_lock(); 968 err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); 969 rtnl_unlock(); 970 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) 971 err = -EFAULT; 972 } else { 973 struct ifreq ifr; 974 bool need_copyout; 975 if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 976 return -EFAULT; 977 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 978 if (!err && need_copyout) 979 if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 980 return -EFAULT; 981 } 982 return err; 983 } 984 985 /* 986 * With an ioctl, arg may well be a user mode pointer, but we don't know 987 * what to do with it - that's up to the protocol still. 988 */ 989 990 struct ns_common *get_net_ns(struct ns_common *ns) 991 { 992 return &get_net(container_of(ns, struct net, ns))->ns; 993 } 994 EXPORT_SYMBOL_GPL(get_net_ns); 995 996 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 997 { 998 struct socket *sock; 999 struct sock *sk; 1000 void __user *argp = (void __user *)arg; 1001 int pid, err; 1002 struct net *net; 1003 1004 sock = file->private_data; 1005 sk = sock->sk; 1006 net = sock_net(sk); 1007 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { 1008 struct ifreq ifr; 1009 bool need_copyout; 1010 if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 1011 return -EFAULT; 1012 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 1013 if (!err && need_copyout) 1014 if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 1015 return -EFAULT; 1016 } else 1017 #ifdef CONFIG_WEXT_CORE 1018 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1019 err = wext_handle_ioctl(net, cmd, argp); 1020 } else 1021 #endif 1022 switch (cmd) { 1023 case FIOSETOWN: 1024 case SIOCSPGRP: 1025 err = -EFAULT; 1026 if (get_user(pid, (int __user *)argp)) 1027 break; 1028 err = f_setown(sock->file, pid, 1); 1029 break; 1030 case FIOGETOWN: 1031 case SIOCGPGRP: 1032 err = put_user(f_getown(sock->file), 1033 (int __user *)argp); 1034 break; 1035 case SIOCGIFBR: 1036 case SIOCSIFBR: 1037 case SIOCBRADDBR: 1038 case SIOCBRDELBR: 1039 err = -ENOPKG; 1040 if (!br_ioctl_hook) 1041 request_module("bridge"); 1042 1043 mutex_lock(&br_ioctl_mutex); 1044 if (br_ioctl_hook) 1045 err = br_ioctl_hook(net, cmd, argp); 1046 mutex_unlock(&br_ioctl_mutex); 1047 break; 1048 case SIOCGIFVLAN: 1049 case SIOCSIFVLAN: 1050 err = -ENOPKG; 1051 if (!vlan_ioctl_hook) 1052 request_module("8021q"); 1053 1054 mutex_lock(&vlan_ioctl_mutex); 1055 if (vlan_ioctl_hook) 1056 err = vlan_ioctl_hook(net, argp); 1057 mutex_unlock(&vlan_ioctl_mutex); 1058 break; 1059 case SIOCADDDLCI: 1060 case SIOCDELDLCI: 1061 err = -ENOPKG; 1062 if (!dlci_ioctl_hook) 1063 request_module("dlci"); 1064 1065 mutex_lock(&dlci_ioctl_mutex); 1066 if (dlci_ioctl_hook) 1067 err = dlci_ioctl_hook(cmd, argp); 1068 mutex_unlock(&dlci_ioctl_mutex); 1069 break; 1070 case SIOCGSKNS: 1071 err = -EPERM; 1072 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1073 break; 1074 1075 err = open_related_ns(&net->ns, get_net_ns); 1076 break; 1077 default: 1078 err = sock_do_ioctl(net, sock, cmd, arg); 1079 break; 1080 } 1081 return err; 1082 } 1083 1084 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1085 { 1086 int err; 1087 struct socket *sock = NULL; 1088 1089 err = security_socket_create(family, type, protocol, 1); 1090 if (err) 1091 goto out; 1092 1093 sock = sock_alloc(); 1094 if (!sock) { 1095 err = -ENOMEM; 1096 goto out; 1097 } 1098 1099 sock->type = type; 1100 err = security_socket_post_create(sock, family, type, protocol, 1); 1101 if (err) 1102 goto out_release; 1103 1104 out: 1105 *res = sock; 1106 return err; 1107 out_release: 1108 sock_release(sock); 1109 sock = NULL; 1110 goto out; 1111 } 1112 EXPORT_SYMBOL(sock_create_lite); 1113 1114 static struct wait_queue_head *sock_get_poll_head(struct file *file, 1115 __poll_t events) 1116 { 1117 struct socket *sock = file->private_data; 1118 1119 if (!sock->ops->poll_mask) 1120 return NULL; 1121 sock_poll_busy_loop(sock, events); 1122 return sk_sleep(sock->sk); 1123 } 1124 1125 static __poll_t sock_poll_mask(struct file *file, __poll_t events) 1126 { 1127 struct socket *sock = file->private_data; 1128 1129 /* 1130 * We need to be sure we are in sync with the socket flags modification. 1131 * 1132 * This memory barrier is paired in the wq_has_sleeper. 1133 */ 1134 smp_mb(); 1135 1136 /* this socket can poll_ll so tell the system call */ 1137 return sock->ops->poll_mask(sock, events) | 1138 (sk_can_busy_loop(sock->sk) ? POLL_BUSY_LOOP : 0); 1139 } 1140 1141 /* No kernel lock held - perfect */ 1142 static __poll_t sock_poll(struct file *file, poll_table *wait) 1143 { 1144 struct socket *sock = file->private_data; 1145 __poll_t events = poll_requested_events(wait), mask = 0; 1146 1147 if (sock->ops->poll) { 1148 sock_poll_busy_loop(sock, events); 1149 mask = sock->ops->poll(file, sock, wait); 1150 } else if (sock->ops->poll_mask) { 1151 sock_poll_wait(file, sock_get_poll_head(file, events), wait); 1152 mask = sock->ops->poll_mask(sock, events); 1153 } 1154 1155 return mask | sock_poll_busy_flag(sock); 1156 } 1157 1158 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1159 { 1160 struct socket *sock = file->private_data; 1161 1162 return sock->ops->mmap(file, sock, vma); 1163 } 1164 1165 static int sock_close(struct inode *inode, struct file *filp) 1166 { 1167 __sock_release(SOCKET_I(inode), inode); 1168 return 0; 1169 } 1170 1171 /* 1172 * Update the socket async list 1173 * 1174 * Fasync_list locking strategy. 1175 * 1176 * 1. fasync_list is modified only under process context socket lock 1177 * i.e. under semaphore. 1178 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1179 * or under socket lock 1180 */ 1181 1182 static int sock_fasync(int fd, struct file *filp, int on) 1183 { 1184 struct socket *sock = filp->private_data; 1185 struct sock *sk = sock->sk; 1186 struct socket_wq *wq; 1187 1188 if (sk == NULL) 1189 return -EINVAL; 1190 1191 lock_sock(sk); 1192 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); 1193 fasync_helper(fd, filp, on, &wq->fasync_list); 1194 1195 if (!wq->fasync_list) 1196 sock_reset_flag(sk, SOCK_FASYNC); 1197 else 1198 sock_set_flag(sk, SOCK_FASYNC); 1199 1200 release_sock(sk); 1201 return 0; 1202 } 1203 1204 /* This function may be called only under rcu_lock */ 1205 1206 int sock_wake_async(struct socket_wq *wq, int how, int band) 1207 { 1208 if (!wq || !wq->fasync_list) 1209 return -1; 1210 1211 switch (how) { 1212 case SOCK_WAKE_WAITD: 1213 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1214 break; 1215 goto call_kill; 1216 case SOCK_WAKE_SPACE: 1217 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1218 break; 1219 /* fall through */ 1220 case SOCK_WAKE_IO: 1221 call_kill: 1222 kill_fasync(&wq->fasync_list, SIGIO, band); 1223 break; 1224 case SOCK_WAKE_URG: 1225 kill_fasync(&wq->fasync_list, SIGURG, band); 1226 } 1227 1228 return 0; 1229 } 1230 EXPORT_SYMBOL(sock_wake_async); 1231 1232 int __sock_create(struct net *net, int family, int type, int protocol, 1233 struct socket **res, int kern) 1234 { 1235 int err; 1236 struct socket *sock; 1237 const struct net_proto_family *pf; 1238 1239 /* 1240 * Check protocol is in range 1241 */ 1242 if (family < 0 || family >= NPROTO) 1243 return -EAFNOSUPPORT; 1244 if (type < 0 || type >= SOCK_MAX) 1245 return -EINVAL; 1246 1247 /* Compatibility. 1248 1249 This uglymoron is moved from INET layer to here to avoid 1250 deadlock in module load. 1251 */ 1252 if (family == PF_INET && type == SOCK_PACKET) { 1253 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1254 current->comm); 1255 family = PF_PACKET; 1256 } 1257 1258 err = security_socket_create(family, type, protocol, kern); 1259 if (err) 1260 return err; 1261 1262 /* 1263 * Allocate the socket and allow the family to set things up. if 1264 * the protocol is 0, the family is instructed to select an appropriate 1265 * default. 1266 */ 1267 sock = sock_alloc(); 1268 if (!sock) { 1269 net_warn_ratelimited("socket: no more sockets\n"); 1270 return -ENFILE; /* Not exactly a match, but its the 1271 closest posix thing */ 1272 } 1273 1274 sock->type = type; 1275 1276 #ifdef CONFIG_MODULES 1277 /* Attempt to load a protocol module if the find failed. 1278 * 1279 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1280 * requested real, full-featured networking support upon configuration. 1281 * Otherwise module support will break! 1282 */ 1283 if (rcu_access_pointer(net_families[family]) == NULL) 1284 request_module("net-pf-%d", family); 1285 #endif 1286 1287 rcu_read_lock(); 1288 pf = rcu_dereference(net_families[family]); 1289 err = -EAFNOSUPPORT; 1290 if (!pf) 1291 goto out_release; 1292 1293 /* 1294 * We will call the ->create function, that possibly is in a loadable 1295 * module, so we have to bump that loadable module refcnt first. 1296 */ 1297 if (!try_module_get(pf->owner)) 1298 goto out_release; 1299 1300 /* Now protected by module ref count */ 1301 rcu_read_unlock(); 1302 1303 err = pf->create(net, sock, protocol, kern); 1304 if (err < 0) 1305 goto out_module_put; 1306 1307 /* 1308 * Now to bump the refcnt of the [loadable] module that owns this 1309 * socket at sock_release time we decrement its refcnt. 1310 */ 1311 if (!try_module_get(sock->ops->owner)) 1312 goto out_module_busy; 1313 1314 /* 1315 * Now that we're done with the ->create function, the [loadable] 1316 * module can have its refcnt decremented 1317 */ 1318 module_put(pf->owner); 1319 err = security_socket_post_create(sock, family, type, protocol, kern); 1320 if (err) 1321 goto out_sock_release; 1322 *res = sock; 1323 1324 return 0; 1325 1326 out_module_busy: 1327 err = -EAFNOSUPPORT; 1328 out_module_put: 1329 sock->ops = NULL; 1330 module_put(pf->owner); 1331 out_sock_release: 1332 sock_release(sock); 1333 return err; 1334 1335 out_release: 1336 rcu_read_unlock(); 1337 goto out_sock_release; 1338 } 1339 EXPORT_SYMBOL(__sock_create); 1340 1341 int sock_create(int family, int type, int protocol, struct socket **res) 1342 { 1343 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1344 } 1345 EXPORT_SYMBOL(sock_create); 1346 1347 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1348 { 1349 return __sock_create(net, family, type, protocol, res, 1); 1350 } 1351 EXPORT_SYMBOL(sock_create_kern); 1352 1353 int __sys_socket(int family, int type, int protocol) 1354 { 1355 int retval; 1356 struct socket *sock; 1357 int flags; 1358 1359 /* Check the SOCK_* constants for consistency. */ 1360 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1361 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1362 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1363 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1364 1365 flags = type & ~SOCK_TYPE_MASK; 1366 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1367 return -EINVAL; 1368 type &= SOCK_TYPE_MASK; 1369 1370 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1371 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1372 1373 retval = sock_create(family, type, protocol, &sock); 1374 if (retval < 0) 1375 return retval; 1376 1377 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1378 } 1379 1380 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1381 { 1382 return __sys_socket(family, type, protocol); 1383 } 1384 1385 /* 1386 * Create a pair of connected sockets. 1387 */ 1388 1389 int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) 1390 { 1391 struct socket *sock1, *sock2; 1392 int fd1, fd2, err; 1393 struct file *newfile1, *newfile2; 1394 int flags; 1395 1396 flags = type & ~SOCK_TYPE_MASK; 1397 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1398 return -EINVAL; 1399 type &= SOCK_TYPE_MASK; 1400 1401 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1402 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1403 1404 /* 1405 * reserve descriptors and make sure we won't fail 1406 * to return them to userland. 1407 */ 1408 fd1 = get_unused_fd_flags(flags); 1409 if (unlikely(fd1 < 0)) 1410 return fd1; 1411 1412 fd2 = get_unused_fd_flags(flags); 1413 if (unlikely(fd2 < 0)) { 1414 put_unused_fd(fd1); 1415 return fd2; 1416 } 1417 1418 err = put_user(fd1, &usockvec[0]); 1419 if (err) 1420 goto out; 1421 1422 err = put_user(fd2, &usockvec[1]); 1423 if (err) 1424 goto out; 1425 1426 /* 1427 * Obtain the first socket and check if the underlying protocol 1428 * supports the socketpair call. 1429 */ 1430 1431 err = sock_create(family, type, protocol, &sock1); 1432 if (unlikely(err < 0)) 1433 goto out; 1434 1435 err = sock_create(family, type, protocol, &sock2); 1436 if (unlikely(err < 0)) { 1437 sock_release(sock1); 1438 goto out; 1439 } 1440 1441 err = security_socket_socketpair(sock1, sock2); 1442 if (unlikely(err)) { 1443 sock_release(sock2); 1444 sock_release(sock1); 1445 goto out; 1446 } 1447 1448 err = sock1->ops->socketpair(sock1, sock2); 1449 if (unlikely(err < 0)) { 1450 sock_release(sock2); 1451 sock_release(sock1); 1452 goto out; 1453 } 1454 1455 newfile1 = sock_alloc_file(sock1, flags, NULL); 1456 if (IS_ERR(newfile1)) { 1457 err = PTR_ERR(newfile1); 1458 sock_release(sock2); 1459 goto out; 1460 } 1461 1462 newfile2 = sock_alloc_file(sock2, flags, NULL); 1463 if (IS_ERR(newfile2)) { 1464 err = PTR_ERR(newfile2); 1465 fput(newfile1); 1466 goto out; 1467 } 1468 1469 audit_fd_pair(fd1, fd2); 1470 1471 fd_install(fd1, newfile1); 1472 fd_install(fd2, newfile2); 1473 return 0; 1474 1475 out: 1476 put_unused_fd(fd2); 1477 put_unused_fd(fd1); 1478 return err; 1479 } 1480 1481 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1482 int __user *, usockvec) 1483 { 1484 return __sys_socketpair(family, type, protocol, usockvec); 1485 } 1486 1487 /* 1488 * Bind a name to a socket. Nothing much to do here since it's 1489 * the protocol's responsibility to handle the local address. 1490 * 1491 * We move the socket address to kernel space before we call 1492 * the protocol layer (having also checked the address is ok). 1493 */ 1494 1495 int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 1496 { 1497 struct socket *sock; 1498 struct sockaddr_storage address; 1499 int err, fput_needed; 1500 1501 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1502 if (sock) { 1503 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1504 if (err >= 0) { 1505 err = security_socket_bind(sock, 1506 (struct sockaddr *)&address, 1507 addrlen); 1508 if (!err) 1509 err = sock->ops->bind(sock, 1510 (struct sockaddr *) 1511 &address, addrlen); 1512 } 1513 fput_light(sock->file, fput_needed); 1514 } 1515 return err; 1516 } 1517 1518 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1519 { 1520 return __sys_bind(fd, umyaddr, addrlen); 1521 } 1522 1523 /* 1524 * Perform a listen. Basically, we allow the protocol to do anything 1525 * necessary for a listen, and if that works, we mark the socket as 1526 * ready for listening. 1527 */ 1528 1529 int __sys_listen(int fd, int backlog) 1530 { 1531 struct socket *sock; 1532 int err, fput_needed; 1533 int somaxconn; 1534 1535 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1536 if (sock) { 1537 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1538 if ((unsigned int)backlog > somaxconn) 1539 backlog = somaxconn; 1540 1541 err = security_socket_listen(sock, backlog); 1542 if (!err) 1543 err = sock->ops->listen(sock, backlog); 1544 1545 fput_light(sock->file, fput_needed); 1546 } 1547 return err; 1548 } 1549 1550 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1551 { 1552 return __sys_listen(fd, backlog); 1553 } 1554 1555 /* 1556 * For accept, we attempt to create a new socket, set up the link 1557 * with the client, wake up the client, then return the new 1558 * connected fd. We collect the address of the connector in kernel 1559 * space and move it to user at the very end. This is unclean because 1560 * we open the socket then return an error. 1561 * 1562 * 1003.1g adds the ability to recvmsg() to query connection pending 1563 * status to recvmsg. We need to add that support in a way thats 1564 * clean when we restructure accept also. 1565 */ 1566 1567 int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 1568 int __user *upeer_addrlen, int flags) 1569 { 1570 struct socket *sock, *newsock; 1571 struct file *newfile; 1572 int err, len, newfd, fput_needed; 1573 struct sockaddr_storage address; 1574 1575 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1576 return -EINVAL; 1577 1578 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1579 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1580 1581 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1582 if (!sock) 1583 goto out; 1584 1585 err = -ENFILE; 1586 newsock = sock_alloc(); 1587 if (!newsock) 1588 goto out_put; 1589 1590 newsock->type = sock->type; 1591 newsock->ops = sock->ops; 1592 1593 /* 1594 * We don't need try_module_get here, as the listening socket (sock) 1595 * has the protocol module (sock->ops->owner) held. 1596 */ 1597 __module_get(newsock->ops->owner); 1598 1599 newfd = get_unused_fd_flags(flags); 1600 if (unlikely(newfd < 0)) { 1601 err = newfd; 1602 sock_release(newsock); 1603 goto out_put; 1604 } 1605 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1606 if (IS_ERR(newfile)) { 1607 err = PTR_ERR(newfile); 1608 put_unused_fd(newfd); 1609 goto out_put; 1610 } 1611 1612 err = security_socket_accept(sock, newsock); 1613 if (err) 1614 goto out_fd; 1615 1616 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 1617 if (err < 0) 1618 goto out_fd; 1619 1620 if (upeer_sockaddr) { 1621 len = newsock->ops->getname(newsock, 1622 (struct sockaddr *)&address, 2); 1623 if (len < 0) { 1624 err = -ECONNABORTED; 1625 goto out_fd; 1626 } 1627 err = move_addr_to_user(&address, 1628 len, upeer_sockaddr, upeer_addrlen); 1629 if (err < 0) 1630 goto out_fd; 1631 } 1632 1633 /* File flags are not inherited via accept() unlike another OSes. */ 1634 1635 fd_install(newfd, newfile); 1636 err = newfd; 1637 1638 out_put: 1639 fput_light(sock->file, fput_needed); 1640 out: 1641 return err; 1642 out_fd: 1643 fput(newfile); 1644 put_unused_fd(newfd); 1645 goto out_put; 1646 } 1647 1648 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1649 int __user *, upeer_addrlen, int, flags) 1650 { 1651 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); 1652 } 1653 1654 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1655 int __user *, upeer_addrlen) 1656 { 1657 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1658 } 1659 1660 /* 1661 * Attempt to connect to a socket with the server address. The address 1662 * is in user space so we verify it is OK and move it to kernel space. 1663 * 1664 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1665 * break bindings 1666 * 1667 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1668 * other SEQPACKET protocols that take time to connect() as it doesn't 1669 * include the -EINPROGRESS status for such sockets. 1670 */ 1671 1672 int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 1673 { 1674 struct socket *sock; 1675 struct sockaddr_storage address; 1676 int err, fput_needed; 1677 1678 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1679 if (!sock) 1680 goto out; 1681 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1682 if (err < 0) 1683 goto out_put; 1684 1685 err = 1686 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1687 if (err) 1688 goto out_put; 1689 1690 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1691 sock->file->f_flags); 1692 out_put: 1693 fput_light(sock->file, fput_needed); 1694 out: 1695 return err; 1696 } 1697 1698 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1699 int, addrlen) 1700 { 1701 return __sys_connect(fd, uservaddr, addrlen); 1702 } 1703 1704 /* 1705 * Get the local address ('name') of a socket object. Move the obtained 1706 * name to user space. 1707 */ 1708 1709 int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, 1710 int __user *usockaddr_len) 1711 { 1712 struct socket *sock; 1713 struct sockaddr_storage address; 1714 int err, fput_needed; 1715 1716 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1717 if (!sock) 1718 goto out; 1719 1720 err = security_socket_getsockname(sock); 1721 if (err) 1722 goto out_put; 1723 1724 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); 1725 if (err < 0) 1726 goto out_put; 1727 /* "err" is actually length in this case */ 1728 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); 1729 1730 out_put: 1731 fput_light(sock->file, fput_needed); 1732 out: 1733 return err; 1734 } 1735 1736 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1737 int __user *, usockaddr_len) 1738 { 1739 return __sys_getsockname(fd, usockaddr, usockaddr_len); 1740 } 1741 1742 /* 1743 * Get the remote address ('name') of a socket object. Move the obtained 1744 * name to user space. 1745 */ 1746 1747 int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, 1748 int __user *usockaddr_len) 1749 { 1750 struct socket *sock; 1751 struct sockaddr_storage address; 1752 int err, fput_needed; 1753 1754 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1755 if (sock != NULL) { 1756 err = security_socket_getpeername(sock); 1757 if (err) { 1758 fput_light(sock->file, fput_needed); 1759 return err; 1760 } 1761 1762 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); 1763 if (err >= 0) 1764 /* "err" is actually length in this case */ 1765 err = move_addr_to_user(&address, err, usockaddr, 1766 usockaddr_len); 1767 fput_light(sock->file, fput_needed); 1768 } 1769 return err; 1770 } 1771 1772 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1773 int __user *, usockaddr_len) 1774 { 1775 return __sys_getpeername(fd, usockaddr, usockaddr_len); 1776 } 1777 1778 /* 1779 * Send a datagram to a given address. We move the address into kernel 1780 * space and check the user space data area is readable before invoking 1781 * the protocol. 1782 */ 1783 int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, 1784 struct sockaddr __user *addr, int addr_len) 1785 { 1786 struct socket *sock; 1787 struct sockaddr_storage address; 1788 int err; 1789 struct msghdr msg; 1790 struct iovec iov; 1791 int fput_needed; 1792 1793 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1794 if (unlikely(err)) 1795 return err; 1796 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1797 if (!sock) 1798 goto out; 1799 1800 msg.msg_name = NULL; 1801 msg.msg_control = NULL; 1802 msg.msg_controllen = 0; 1803 msg.msg_namelen = 0; 1804 if (addr) { 1805 err = move_addr_to_kernel(addr, addr_len, &address); 1806 if (err < 0) 1807 goto out_put; 1808 msg.msg_name = (struct sockaddr *)&address; 1809 msg.msg_namelen = addr_len; 1810 } 1811 if (sock->file->f_flags & O_NONBLOCK) 1812 flags |= MSG_DONTWAIT; 1813 msg.msg_flags = flags; 1814 err = sock_sendmsg(sock, &msg); 1815 1816 out_put: 1817 fput_light(sock->file, fput_needed); 1818 out: 1819 return err; 1820 } 1821 1822 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1823 unsigned int, flags, struct sockaddr __user *, addr, 1824 int, addr_len) 1825 { 1826 return __sys_sendto(fd, buff, len, flags, addr, addr_len); 1827 } 1828 1829 /* 1830 * Send a datagram down a socket. 1831 */ 1832 1833 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1834 unsigned int, flags) 1835 { 1836 return __sys_sendto(fd, buff, len, flags, NULL, 0); 1837 } 1838 1839 /* 1840 * Receive a frame from the socket and optionally record the address of the 1841 * sender. We verify the buffers are writable and if needed move the 1842 * sender address from kernel to user space. 1843 */ 1844 int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, 1845 struct sockaddr __user *addr, int __user *addr_len) 1846 { 1847 struct socket *sock; 1848 struct iovec iov; 1849 struct msghdr msg; 1850 struct sockaddr_storage address; 1851 int err, err2; 1852 int fput_needed; 1853 1854 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1855 if (unlikely(err)) 1856 return err; 1857 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1858 if (!sock) 1859 goto out; 1860 1861 msg.msg_control = NULL; 1862 msg.msg_controllen = 0; 1863 /* Save some cycles and don't copy the address if not needed */ 1864 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1865 /* We assume all kernel code knows the size of sockaddr_storage */ 1866 msg.msg_namelen = 0; 1867 msg.msg_iocb = NULL; 1868 msg.msg_flags = 0; 1869 if (sock->file->f_flags & O_NONBLOCK) 1870 flags |= MSG_DONTWAIT; 1871 err = sock_recvmsg(sock, &msg, flags); 1872 1873 if (err >= 0 && addr != NULL) { 1874 err2 = move_addr_to_user(&address, 1875 msg.msg_namelen, addr, addr_len); 1876 if (err2 < 0) 1877 err = err2; 1878 } 1879 1880 fput_light(sock->file, fput_needed); 1881 out: 1882 return err; 1883 } 1884 1885 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1886 unsigned int, flags, struct sockaddr __user *, addr, 1887 int __user *, addr_len) 1888 { 1889 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); 1890 } 1891 1892 /* 1893 * Receive a datagram from a socket. 1894 */ 1895 1896 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1897 unsigned int, flags) 1898 { 1899 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1900 } 1901 1902 /* 1903 * Set a socket option. Because we don't know the option lengths we have 1904 * to pass the user mode parameter for the protocols to sort out. 1905 */ 1906 1907 static int __sys_setsockopt(int fd, int level, int optname, 1908 char __user *optval, int optlen) 1909 { 1910 int err, fput_needed; 1911 struct socket *sock; 1912 1913 if (optlen < 0) 1914 return -EINVAL; 1915 1916 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1917 if (sock != NULL) { 1918 err = security_socket_setsockopt(sock, level, optname); 1919 if (err) 1920 goto out_put; 1921 1922 if (level == SOL_SOCKET) 1923 err = 1924 sock_setsockopt(sock, level, optname, optval, 1925 optlen); 1926 else 1927 err = 1928 sock->ops->setsockopt(sock, level, optname, optval, 1929 optlen); 1930 out_put: 1931 fput_light(sock->file, fput_needed); 1932 } 1933 return err; 1934 } 1935 1936 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1937 char __user *, optval, int, optlen) 1938 { 1939 return __sys_setsockopt(fd, level, optname, optval, optlen); 1940 } 1941 1942 /* 1943 * Get a socket option. Because we don't know the option lengths we have 1944 * to pass a user mode parameter for the protocols to sort out. 1945 */ 1946 1947 static int __sys_getsockopt(int fd, int level, int optname, 1948 char __user *optval, int __user *optlen) 1949 { 1950 int err, fput_needed; 1951 struct socket *sock; 1952 1953 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1954 if (sock != NULL) { 1955 err = security_socket_getsockopt(sock, level, optname); 1956 if (err) 1957 goto out_put; 1958 1959 if (level == SOL_SOCKET) 1960 err = 1961 sock_getsockopt(sock, level, optname, optval, 1962 optlen); 1963 else 1964 err = 1965 sock->ops->getsockopt(sock, level, optname, optval, 1966 optlen); 1967 out_put: 1968 fput_light(sock->file, fput_needed); 1969 } 1970 return err; 1971 } 1972 1973 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1974 char __user *, optval, int __user *, optlen) 1975 { 1976 return __sys_getsockopt(fd, level, optname, optval, optlen); 1977 } 1978 1979 /* 1980 * Shutdown a socket. 1981 */ 1982 1983 int __sys_shutdown(int fd, int how) 1984 { 1985 int err, fput_needed; 1986 struct socket *sock; 1987 1988 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1989 if (sock != NULL) { 1990 err = security_socket_shutdown(sock, how); 1991 if (!err) 1992 err = sock->ops->shutdown(sock, how); 1993 fput_light(sock->file, fput_needed); 1994 } 1995 return err; 1996 } 1997 1998 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1999 { 2000 return __sys_shutdown(fd, how); 2001 } 2002 2003 /* A couple of helpful macros for getting the address of the 32/64 bit 2004 * fields which are the same type (int / unsigned) on our platforms. 2005 */ 2006 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 2007 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 2008 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 2009 2010 struct used_address { 2011 struct sockaddr_storage name; 2012 unsigned int name_len; 2013 }; 2014 2015 static int copy_msghdr_from_user(struct msghdr *kmsg, 2016 struct user_msghdr __user *umsg, 2017 struct sockaddr __user **save_addr, 2018 struct iovec **iov) 2019 { 2020 struct user_msghdr msg; 2021 ssize_t err; 2022 2023 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 2024 return -EFAULT; 2025 2026 kmsg->msg_control = (void __force *)msg.msg_control; 2027 kmsg->msg_controllen = msg.msg_controllen; 2028 kmsg->msg_flags = msg.msg_flags; 2029 2030 kmsg->msg_namelen = msg.msg_namelen; 2031 if (!msg.msg_name) 2032 kmsg->msg_namelen = 0; 2033 2034 if (kmsg->msg_namelen < 0) 2035 return -EINVAL; 2036 2037 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 2038 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 2039 2040 if (save_addr) 2041 *save_addr = msg.msg_name; 2042 2043 if (msg.msg_name && kmsg->msg_namelen) { 2044 if (!save_addr) { 2045 err = move_addr_to_kernel(msg.msg_name, 2046 kmsg->msg_namelen, 2047 kmsg->msg_name); 2048 if (err < 0) 2049 return err; 2050 } 2051 } else { 2052 kmsg->msg_name = NULL; 2053 kmsg->msg_namelen = 0; 2054 } 2055 2056 if (msg.msg_iovlen > UIO_MAXIOV) 2057 return -EMSGSIZE; 2058 2059 kmsg->msg_iocb = NULL; 2060 2061 return import_iovec(save_addr ? READ : WRITE, 2062 msg.msg_iov, msg.msg_iovlen, 2063 UIO_FASTIOV, iov, &kmsg->msg_iter); 2064 } 2065 2066 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 2067 struct msghdr *msg_sys, unsigned int flags, 2068 struct used_address *used_address, 2069 unsigned int allowed_msghdr_flags) 2070 { 2071 struct compat_msghdr __user *msg_compat = 2072 (struct compat_msghdr __user *)msg; 2073 struct sockaddr_storage address; 2074 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2075 unsigned char ctl[sizeof(struct cmsghdr) + 20] 2076 __aligned(sizeof(__kernel_size_t)); 2077 /* 20 is size of ipv6_pktinfo */ 2078 unsigned char *ctl_buf = ctl; 2079 int ctl_len; 2080 ssize_t err; 2081 2082 msg_sys->msg_name = &address; 2083 2084 if (MSG_CMSG_COMPAT & flags) 2085 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 2086 else 2087 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 2088 if (err < 0) 2089 return err; 2090 2091 err = -ENOBUFS; 2092 2093 if (msg_sys->msg_controllen > INT_MAX) 2094 goto out_freeiov; 2095 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 2096 ctl_len = msg_sys->msg_controllen; 2097 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2098 err = 2099 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2100 sizeof(ctl)); 2101 if (err) 2102 goto out_freeiov; 2103 ctl_buf = msg_sys->msg_control; 2104 ctl_len = msg_sys->msg_controllen; 2105 } else if (ctl_len) { 2106 BUILD_BUG_ON(sizeof(struct cmsghdr) != 2107 CMSG_ALIGN(sizeof(struct cmsghdr))); 2108 if (ctl_len > sizeof(ctl)) { 2109 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2110 if (ctl_buf == NULL) 2111 goto out_freeiov; 2112 } 2113 err = -EFAULT; 2114 /* 2115 * Careful! Before this, msg_sys->msg_control contains a user pointer. 2116 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 2117 * checking falls down on this. 2118 */ 2119 if (copy_from_user(ctl_buf, 2120 (void __user __force *)msg_sys->msg_control, 2121 ctl_len)) 2122 goto out_freectl; 2123 msg_sys->msg_control = ctl_buf; 2124 } 2125 msg_sys->msg_flags = flags; 2126 2127 if (sock->file->f_flags & O_NONBLOCK) 2128 msg_sys->msg_flags |= MSG_DONTWAIT; 2129 /* 2130 * If this is sendmmsg() and current destination address is same as 2131 * previously succeeded address, omit asking LSM's decision. 2132 * used_address->name_len is initialized to UINT_MAX so that the first 2133 * destination address never matches. 2134 */ 2135 if (used_address && msg_sys->msg_name && 2136 used_address->name_len == msg_sys->msg_namelen && 2137 !memcmp(&used_address->name, msg_sys->msg_name, 2138 used_address->name_len)) { 2139 err = sock_sendmsg_nosec(sock, msg_sys); 2140 goto out_freectl; 2141 } 2142 err = sock_sendmsg(sock, msg_sys); 2143 /* 2144 * If this is sendmmsg() and sending to current destination address was 2145 * successful, remember it. 2146 */ 2147 if (used_address && err >= 0) { 2148 used_address->name_len = msg_sys->msg_namelen; 2149 if (msg_sys->msg_name) 2150 memcpy(&used_address->name, msg_sys->msg_name, 2151 used_address->name_len); 2152 } 2153 2154 out_freectl: 2155 if (ctl_buf != ctl) 2156 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2157 out_freeiov: 2158 kfree(iov); 2159 return err; 2160 } 2161 2162 /* 2163 * BSD sendmsg interface 2164 */ 2165 2166 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2167 bool forbid_cmsg_compat) 2168 { 2169 int fput_needed, err; 2170 struct msghdr msg_sys; 2171 struct socket *sock; 2172 2173 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2174 return -EINVAL; 2175 2176 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2177 if (!sock) 2178 goto out; 2179 2180 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2181 2182 fput_light(sock->file, fput_needed); 2183 out: 2184 return err; 2185 } 2186 2187 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2188 { 2189 return __sys_sendmsg(fd, msg, flags, true); 2190 } 2191 2192 /* 2193 * Linux sendmmsg interface 2194 */ 2195 2196 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2197 unsigned int flags, bool forbid_cmsg_compat) 2198 { 2199 int fput_needed, err, datagrams; 2200 struct socket *sock; 2201 struct mmsghdr __user *entry; 2202 struct compat_mmsghdr __user *compat_entry; 2203 struct msghdr msg_sys; 2204 struct used_address used_address; 2205 unsigned int oflags = flags; 2206 2207 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2208 return -EINVAL; 2209 2210 if (vlen > UIO_MAXIOV) 2211 vlen = UIO_MAXIOV; 2212 2213 datagrams = 0; 2214 2215 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2216 if (!sock) 2217 return err; 2218 2219 used_address.name_len = UINT_MAX; 2220 entry = mmsg; 2221 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2222 err = 0; 2223 flags |= MSG_BATCH; 2224 2225 while (datagrams < vlen) { 2226 if (datagrams == vlen - 1) 2227 flags = oflags; 2228 2229 if (MSG_CMSG_COMPAT & flags) { 2230 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2231 &msg_sys, flags, &used_address, MSG_EOR); 2232 if (err < 0) 2233 break; 2234 err = __put_user(err, &compat_entry->msg_len); 2235 ++compat_entry; 2236 } else { 2237 err = ___sys_sendmsg(sock, 2238 (struct user_msghdr __user *)entry, 2239 &msg_sys, flags, &used_address, MSG_EOR); 2240 if (err < 0) 2241 break; 2242 err = put_user(err, &entry->msg_len); 2243 ++entry; 2244 } 2245 2246 if (err) 2247 break; 2248 ++datagrams; 2249 if (msg_data_left(&msg_sys)) 2250 break; 2251 cond_resched(); 2252 } 2253 2254 fput_light(sock->file, fput_needed); 2255 2256 /* We only return an error if no datagrams were able to be sent */ 2257 if (datagrams != 0) 2258 return datagrams; 2259 2260 return err; 2261 } 2262 2263 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2264 unsigned int, vlen, unsigned int, flags) 2265 { 2266 return __sys_sendmmsg(fd, mmsg, vlen, flags, true); 2267 } 2268 2269 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2270 struct msghdr *msg_sys, unsigned int flags, int nosec) 2271 { 2272 struct compat_msghdr __user *msg_compat = 2273 (struct compat_msghdr __user *)msg; 2274 struct iovec iovstack[UIO_FASTIOV]; 2275 struct iovec *iov = iovstack; 2276 unsigned long cmsg_ptr; 2277 int len; 2278 ssize_t err; 2279 2280 /* kernel mode address */ 2281 struct sockaddr_storage addr; 2282 2283 /* user mode address pointers */ 2284 struct sockaddr __user *uaddr; 2285 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2286 2287 msg_sys->msg_name = &addr; 2288 2289 if (MSG_CMSG_COMPAT & flags) 2290 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2291 else 2292 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 2293 if (err < 0) 2294 return err; 2295 2296 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2297 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2298 2299 /* We assume all kernel code knows the size of sockaddr_storage */ 2300 msg_sys->msg_namelen = 0; 2301 2302 if (sock->file->f_flags & O_NONBLOCK) 2303 flags |= MSG_DONTWAIT; 2304 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 2305 if (err < 0) 2306 goto out_freeiov; 2307 len = err; 2308 2309 if (uaddr != NULL) { 2310 err = move_addr_to_user(&addr, 2311 msg_sys->msg_namelen, uaddr, 2312 uaddr_len); 2313 if (err < 0) 2314 goto out_freeiov; 2315 } 2316 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2317 COMPAT_FLAGS(msg)); 2318 if (err) 2319 goto out_freeiov; 2320 if (MSG_CMSG_COMPAT & flags) 2321 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2322 &msg_compat->msg_controllen); 2323 else 2324 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2325 &msg->msg_controllen); 2326 if (err) 2327 goto out_freeiov; 2328 err = len; 2329 2330 out_freeiov: 2331 kfree(iov); 2332 return err; 2333 } 2334 2335 /* 2336 * BSD recvmsg interface 2337 */ 2338 2339 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2340 bool forbid_cmsg_compat) 2341 { 2342 int fput_needed, err; 2343 struct msghdr msg_sys; 2344 struct socket *sock; 2345 2346 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2347 return -EINVAL; 2348 2349 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2350 if (!sock) 2351 goto out; 2352 2353 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2354 2355 fput_light(sock->file, fput_needed); 2356 out: 2357 return err; 2358 } 2359 2360 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2361 unsigned int, flags) 2362 { 2363 return __sys_recvmsg(fd, msg, flags, true); 2364 } 2365 2366 /* 2367 * Linux recvmmsg interface 2368 */ 2369 2370 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2371 unsigned int flags, struct timespec *timeout) 2372 { 2373 int fput_needed, err, datagrams; 2374 struct socket *sock; 2375 struct mmsghdr __user *entry; 2376 struct compat_mmsghdr __user *compat_entry; 2377 struct msghdr msg_sys; 2378 struct timespec64 end_time; 2379 struct timespec64 timeout64; 2380 2381 if (timeout && 2382 poll_select_set_timeout(&end_time, timeout->tv_sec, 2383 timeout->tv_nsec)) 2384 return -EINVAL; 2385 2386 datagrams = 0; 2387 2388 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2389 if (!sock) 2390 return err; 2391 2392 if (likely(!(flags & MSG_ERRQUEUE))) { 2393 err = sock_error(sock->sk); 2394 if (err) { 2395 datagrams = err; 2396 goto out_put; 2397 } 2398 } 2399 2400 entry = mmsg; 2401 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2402 2403 while (datagrams < vlen) { 2404 /* 2405 * No need to ask LSM for more than the first datagram. 2406 */ 2407 if (MSG_CMSG_COMPAT & flags) { 2408 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2409 &msg_sys, flags & ~MSG_WAITFORONE, 2410 datagrams); 2411 if (err < 0) 2412 break; 2413 err = __put_user(err, &compat_entry->msg_len); 2414 ++compat_entry; 2415 } else { 2416 err = ___sys_recvmsg(sock, 2417 (struct user_msghdr __user *)entry, 2418 &msg_sys, flags & ~MSG_WAITFORONE, 2419 datagrams); 2420 if (err < 0) 2421 break; 2422 err = put_user(err, &entry->msg_len); 2423 ++entry; 2424 } 2425 2426 if (err) 2427 break; 2428 ++datagrams; 2429 2430 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2431 if (flags & MSG_WAITFORONE) 2432 flags |= MSG_DONTWAIT; 2433 2434 if (timeout) { 2435 ktime_get_ts64(&timeout64); 2436 *timeout = timespec64_to_timespec( 2437 timespec64_sub(end_time, timeout64)); 2438 if (timeout->tv_sec < 0) { 2439 timeout->tv_sec = timeout->tv_nsec = 0; 2440 break; 2441 } 2442 2443 /* Timeout, return less than vlen datagrams */ 2444 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2445 break; 2446 } 2447 2448 /* Out of band data, return right away */ 2449 if (msg_sys.msg_flags & MSG_OOB) 2450 break; 2451 cond_resched(); 2452 } 2453 2454 if (err == 0) 2455 goto out_put; 2456 2457 if (datagrams == 0) { 2458 datagrams = err; 2459 goto out_put; 2460 } 2461 2462 /* 2463 * We may return less entries than requested (vlen) if the 2464 * sock is non block and there aren't enough datagrams... 2465 */ 2466 if (err != -EAGAIN) { 2467 /* 2468 * ... or if recvmsg returns an error after we 2469 * received some datagrams, where we record the 2470 * error to return on the next call or if the 2471 * app asks about it using getsockopt(SO_ERROR). 2472 */ 2473 sock->sk->sk_err = -err; 2474 } 2475 out_put: 2476 fput_light(sock->file, fput_needed); 2477 2478 return datagrams; 2479 } 2480 2481 static int do_sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2482 unsigned int vlen, unsigned int flags, 2483 struct timespec __user *timeout) 2484 { 2485 int datagrams; 2486 struct timespec timeout_sys; 2487 2488 if (flags & MSG_CMSG_COMPAT) 2489 return -EINVAL; 2490 2491 if (!timeout) 2492 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2493 2494 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2495 return -EFAULT; 2496 2497 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2498 2499 if (datagrams > 0 && 2500 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2501 datagrams = -EFAULT; 2502 2503 return datagrams; 2504 } 2505 2506 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2507 unsigned int, vlen, unsigned int, flags, 2508 struct timespec __user *, timeout) 2509 { 2510 return do_sys_recvmmsg(fd, mmsg, vlen, flags, timeout); 2511 } 2512 2513 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2514 /* Argument list sizes for sys_socketcall */ 2515 #define AL(x) ((x) * sizeof(unsigned long)) 2516 static const unsigned char nargs[21] = { 2517 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2518 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2519 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2520 AL(4), AL(5), AL(4) 2521 }; 2522 2523 #undef AL 2524 2525 /* 2526 * System call vectors. 2527 * 2528 * Argument checking cleaned up. Saved 20% in size. 2529 * This function doesn't need to set the kernel lock because 2530 * it is set by the callees. 2531 */ 2532 2533 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2534 { 2535 unsigned long a[AUDITSC_ARGS]; 2536 unsigned long a0, a1; 2537 int err; 2538 unsigned int len; 2539 2540 if (call < 1 || call > SYS_SENDMMSG) 2541 return -EINVAL; 2542 2543 len = nargs[call]; 2544 if (len > sizeof(a)) 2545 return -EINVAL; 2546 2547 /* copy_from_user should be SMP safe. */ 2548 if (copy_from_user(a, args, len)) 2549 return -EFAULT; 2550 2551 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2552 if (err) 2553 return err; 2554 2555 a0 = a[0]; 2556 a1 = a[1]; 2557 2558 switch (call) { 2559 case SYS_SOCKET: 2560 err = __sys_socket(a0, a1, a[2]); 2561 break; 2562 case SYS_BIND: 2563 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2564 break; 2565 case SYS_CONNECT: 2566 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2567 break; 2568 case SYS_LISTEN: 2569 err = __sys_listen(a0, a1); 2570 break; 2571 case SYS_ACCEPT: 2572 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2573 (int __user *)a[2], 0); 2574 break; 2575 case SYS_GETSOCKNAME: 2576 err = 2577 __sys_getsockname(a0, (struct sockaddr __user *)a1, 2578 (int __user *)a[2]); 2579 break; 2580 case SYS_GETPEERNAME: 2581 err = 2582 __sys_getpeername(a0, (struct sockaddr __user *)a1, 2583 (int __user *)a[2]); 2584 break; 2585 case SYS_SOCKETPAIR: 2586 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2587 break; 2588 case SYS_SEND: 2589 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2590 NULL, 0); 2591 break; 2592 case SYS_SENDTO: 2593 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2594 (struct sockaddr __user *)a[4], a[5]); 2595 break; 2596 case SYS_RECV: 2597 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2598 NULL, NULL); 2599 break; 2600 case SYS_RECVFROM: 2601 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2602 (struct sockaddr __user *)a[4], 2603 (int __user *)a[5]); 2604 break; 2605 case SYS_SHUTDOWN: 2606 err = __sys_shutdown(a0, a1); 2607 break; 2608 case SYS_SETSOCKOPT: 2609 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], 2610 a[4]); 2611 break; 2612 case SYS_GETSOCKOPT: 2613 err = 2614 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2615 (int __user *)a[4]); 2616 break; 2617 case SYS_SENDMSG: 2618 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, 2619 a[2], true); 2620 break; 2621 case SYS_SENDMMSG: 2622 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], 2623 a[3], true); 2624 break; 2625 case SYS_RECVMSG: 2626 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, 2627 a[2], true); 2628 break; 2629 case SYS_RECVMMSG: 2630 err = do_sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], 2631 a[3], (struct timespec __user *)a[4]); 2632 break; 2633 case SYS_ACCEPT4: 2634 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2635 (int __user *)a[2], a[3]); 2636 break; 2637 default: 2638 err = -EINVAL; 2639 break; 2640 } 2641 return err; 2642 } 2643 2644 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2645 2646 /** 2647 * sock_register - add a socket protocol handler 2648 * @ops: description of protocol 2649 * 2650 * This function is called by a protocol handler that wants to 2651 * advertise its address family, and have it linked into the 2652 * socket interface. The value ops->family corresponds to the 2653 * socket system call protocol family. 2654 */ 2655 int sock_register(const struct net_proto_family *ops) 2656 { 2657 int err; 2658 2659 if (ops->family >= NPROTO) { 2660 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2661 return -ENOBUFS; 2662 } 2663 2664 spin_lock(&net_family_lock); 2665 if (rcu_dereference_protected(net_families[ops->family], 2666 lockdep_is_held(&net_family_lock))) 2667 err = -EEXIST; 2668 else { 2669 rcu_assign_pointer(net_families[ops->family], ops); 2670 err = 0; 2671 } 2672 spin_unlock(&net_family_lock); 2673 2674 pr_info("NET: Registered protocol family %d\n", ops->family); 2675 return err; 2676 } 2677 EXPORT_SYMBOL(sock_register); 2678 2679 /** 2680 * sock_unregister - remove a protocol handler 2681 * @family: protocol family to remove 2682 * 2683 * This function is called by a protocol handler that wants to 2684 * remove its address family, and have it unlinked from the 2685 * new socket creation. 2686 * 2687 * If protocol handler is a module, then it can use module reference 2688 * counts to protect against new references. If protocol handler is not 2689 * a module then it needs to provide its own protection in 2690 * the ops->create routine. 2691 */ 2692 void sock_unregister(int family) 2693 { 2694 BUG_ON(family < 0 || family >= NPROTO); 2695 2696 spin_lock(&net_family_lock); 2697 RCU_INIT_POINTER(net_families[family], NULL); 2698 spin_unlock(&net_family_lock); 2699 2700 synchronize_rcu(); 2701 2702 pr_info("NET: Unregistered protocol family %d\n", family); 2703 } 2704 EXPORT_SYMBOL(sock_unregister); 2705 2706 bool sock_is_registered(int family) 2707 { 2708 return family < NPROTO && rcu_access_pointer(net_families[family]); 2709 } 2710 2711 static int __init sock_init(void) 2712 { 2713 int err; 2714 /* 2715 * Initialize the network sysctl infrastructure. 2716 */ 2717 err = net_sysctl_init(); 2718 if (err) 2719 goto out; 2720 2721 /* 2722 * Initialize skbuff SLAB cache 2723 */ 2724 skb_init(); 2725 2726 /* 2727 * Initialize the protocols module. 2728 */ 2729 2730 init_inodecache(); 2731 2732 err = register_filesystem(&sock_fs_type); 2733 if (err) 2734 goto out_fs; 2735 sock_mnt = kern_mount(&sock_fs_type); 2736 if (IS_ERR(sock_mnt)) { 2737 err = PTR_ERR(sock_mnt); 2738 goto out_mount; 2739 } 2740 2741 /* The real protocol initialization is performed in later initcalls. 2742 */ 2743 2744 #ifdef CONFIG_NETFILTER 2745 err = netfilter_init(); 2746 if (err) 2747 goto out; 2748 #endif 2749 2750 ptp_classifier_init(); 2751 2752 out: 2753 return err; 2754 2755 out_mount: 2756 unregister_filesystem(&sock_fs_type); 2757 out_fs: 2758 goto out; 2759 } 2760 2761 core_initcall(sock_init); /* early initcall */ 2762 2763 #ifdef CONFIG_PROC_FS 2764 void socket_seq_show(struct seq_file *seq) 2765 { 2766 seq_printf(seq, "sockets: used %d\n", 2767 sock_inuse_get(seq->private)); 2768 } 2769 #endif /* CONFIG_PROC_FS */ 2770 2771 #ifdef CONFIG_COMPAT 2772 static int do_siocgstamp(struct net *net, struct socket *sock, 2773 unsigned int cmd, void __user *up) 2774 { 2775 mm_segment_t old_fs = get_fs(); 2776 struct timeval ktv; 2777 int err; 2778 2779 set_fs(KERNEL_DS); 2780 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2781 set_fs(old_fs); 2782 if (!err) 2783 err = compat_put_timeval(&ktv, up); 2784 2785 return err; 2786 } 2787 2788 static int do_siocgstampns(struct net *net, struct socket *sock, 2789 unsigned int cmd, void __user *up) 2790 { 2791 mm_segment_t old_fs = get_fs(); 2792 struct timespec kts; 2793 int err; 2794 2795 set_fs(KERNEL_DS); 2796 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2797 set_fs(old_fs); 2798 if (!err) 2799 err = compat_put_timespec(&kts, up); 2800 2801 return err; 2802 } 2803 2804 static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2805 { 2806 struct compat_ifconf ifc32; 2807 struct ifconf ifc; 2808 int err; 2809 2810 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2811 return -EFAULT; 2812 2813 ifc.ifc_len = ifc32.ifc_len; 2814 ifc.ifc_req = compat_ptr(ifc32.ifcbuf); 2815 2816 rtnl_lock(); 2817 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); 2818 rtnl_unlock(); 2819 if (err) 2820 return err; 2821 2822 ifc32.ifc_len = ifc.ifc_len; 2823 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2824 return -EFAULT; 2825 2826 return 0; 2827 } 2828 2829 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2830 { 2831 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2832 bool convert_in = false, convert_out = false; 2833 size_t buf_size = 0; 2834 struct ethtool_rxnfc __user *rxnfc = NULL; 2835 struct ifreq ifr; 2836 u32 rule_cnt = 0, actual_rule_cnt; 2837 u32 ethcmd; 2838 u32 data; 2839 int ret; 2840 2841 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2842 return -EFAULT; 2843 2844 compat_rxnfc = compat_ptr(data); 2845 2846 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2847 return -EFAULT; 2848 2849 /* Most ethtool structures are defined without padding. 2850 * Unfortunately struct ethtool_rxnfc is an exception. 2851 */ 2852 switch (ethcmd) { 2853 default: 2854 break; 2855 case ETHTOOL_GRXCLSRLALL: 2856 /* Buffer size is variable */ 2857 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2858 return -EFAULT; 2859 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2860 return -ENOMEM; 2861 buf_size += rule_cnt * sizeof(u32); 2862 /* fall through */ 2863 case ETHTOOL_GRXRINGS: 2864 case ETHTOOL_GRXCLSRLCNT: 2865 case ETHTOOL_GRXCLSRULE: 2866 case ETHTOOL_SRXCLSRLINS: 2867 convert_out = true; 2868 /* fall through */ 2869 case ETHTOOL_SRXCLSRLDEL: 2870 buf_size += sizeof(struct ethtool_rxnfc); 2871 convert_in = true; 2872 rxnfc = compat_alloc_user_space(buf_size); 2873 break; 2874 } 2875 2876 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2877 return -EFAULT; 2878 2879 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; 2880 2881 if (convert_in) { 2882 /* We expect there to be holes between fs.m_ext and 2883 * fs.ring_cookie and at the end of fs, but nowhere else. 2884 */ 2885 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2886 sizeof(compat_rxnfc->fs.m_ext) != 2887 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2888 sizeof(rxnfc->fs.m_ext)); 2889 BUILD_BUG_ON( 2890 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2891 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2892 offsetof(struct ethtool_rxnfc, fs.location) - 2893 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2894 2895 if (copy_in_user(rxnfc, compat_rxnfc, 2896 (void __user *)(&rxnfc->fs.m_ext + 1) - 2897 (void __user *)rxnfc) || 2898 copy_in_user(&rxnfc->fs.ring_cookie, 2899 &compat_rxnfc->fs.ring_cookie, 2900 (void __user *)(&rxnfc->fs.location + 1) - 2901 (void __user *)&rxnfc->fs.ring_cookie) || 2902 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2903 sizeof(rxnfc->rule_cnt))) 2904 return -EFAULT; 2905 } 2906 2907 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); 2908 if (ret) 2909 return ret; 2910 2911 if (convert_out) { 2912 if (copy_in_user(compat_rxnfc, rxnfc, 2913 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2914 (const void __user *)rxnfc) || 2915 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2916 &rxnfc->fs.ring_cookie, 2917 (const void __user *)(&rxnfc->fs.location + 1) - 2918 (const void __user *)&rxnfc->fs.ring_cookie) || 2919 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2920 sizeof(rxnfc->rule_cnt))) 2921 return -EFAULT; 2922 2923 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2924 /* As an optimisation, we only copy the actual 2925 * number of rules that the underlying 2926 * function returned. Since Mallory might 2927 * change the rule count in user memory, we 2928 * check that it is less than the rule count 2929 * originally given (as the user buffer size), 2930 * which has been range-checked. 2931 */ 2932 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2933 return -EFAULT; 2934 if (actual_rule_cnt < rule_cnt) 2935 rule_cnt = actual_rule_cnt; 2936 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2937 &rxnfc->rule_locs[0], 2938 rule_cnt * sizeof(u32))) 2939 return -EFAULT; 2940 } 2941 } 2942 2943 return 0; 2944 } 2945 2946 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2947 { 2948 compat_uptr_t uptr32; 2949 struct ifreq ifr; 2950 void __user *saved; 2951 int err; 2952 2953 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) 2954 return -EFAULT; 2955 2956 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2957 return -EFAULT; 2958 2959 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; 2960 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); 2961 2962 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); 2963 if (!err) { 2964 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; 2965 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) 2966 err = -EFAULT; 2967 } 2968 return err; 2969 } 2970 2971 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 2972 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 2973 struct compat_ifreq __user *u_ifreq32) 2974 { 2975 struct ifreq ifreq; 2976 u32 data32; 2977 2978 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) 2979 return -EFAULT; 2980 if (get_user(data32, &u_ifreq32->ifr_data)) 2981 return -EFAULT; 2982 ifreq.ifr_data = compat_ptr(data32); 2983 2984 return dev_ioctl(net, cmd, &ifreq, NULL); 2985 } 2986 2987 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 2988 struct compat_ifreq __user *uifr32) 2989 { 2990 struct ifreq ifr; 2991 struct compat_ifmap __user *uifmap32; 2992 int err; 2993 2994 uifmap32 = &uifr32->ifr_ifru.ifru_map; 2995 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 2996 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2997 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2998 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2999 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 3000 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 3001 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 3002 if (err) 3003 return -EFAULT; 3004 3005 err = dev_ioctl(net, cmd, &ifr, NULL); 3006 3007 if (cmd == SIOCGIFMAP && !err) { 3008 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3009 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3010 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3011 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3012 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3013 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3014 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3015 if (err) 3016 err = -EFAULT; 3017 } 3018 return err; 3019 } 3020 3021 struct rtentry32 { 3022 u32 rt_pad1; 3023 struct sockaddr rt_dst; /* target address */ 3024 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3025 struct sockaddr rt_genmask; /* target network mask (IP) */ 3026 unsigned short rt_flags; 3027 short rt_pad2; 3028 u32 rt_pad3; 3029 unsigned char rt_tos; 3030 unsigned char rt_class; 3031 short rt_pad4; 3032 short rt_metric; /* +1 for binary compatibility! */ 3033 /* char * */ u32 rt_dev; /* forcing the device at add */ 3034 u32 rt_mtu; /* per route MTU/Window */ 3035 u32 rt_window; /* Window clamping */ 3036 unsigned short rt_irtt; /* Initial RTT */ 3037 }; 3038 3039 struct in6_rtmsg32 { 3040 struct in6_addr rtmsg_dst; 3041 struct in6_addr rtmsg_src; 3042 struct in6_addr rtmsg_gateway; 3043 u32 rtmsg_type; 3044 u16 rtmsg_dst_len; 3045 u16 rtmsg_src_len; 3046 u32 rtmsg_metric; 3047 u32 rtmsg_info; 3048 u32 rtmsg_flags; 3049 s32 rtmsg_ifindex; 3050 }; 3051 3052 static int routing_ioctl(struct net *net, struct socket *sock, 3053 unsigned int cmd, void __user *argp) 3054 { 3055 int ret; 3056 void *r = NULL; 3057 struct in6_rtmsg r6; 3058 struct rtentry r4; 3059 char devname[16]; 3060 u32 rtdev; 3061 mm_segment_t old_fs = get_fs(); 3062 3063 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3064 struct in6_rtmsg32 __user *ur6 = argp; 3065 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3066 3 * sizeof(struct in6_addr)); 3067 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3068 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3069 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3070 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3071 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3072 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3073 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3074 3075 r = (void *) &r6; 3076 } else { /* ipv4 */ 3077 struct rtentry32 __user *ur4 = argp; 3078 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3079 3 * sizeof(struct sockaddr)); 3080 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3081 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3082 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3083 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3084 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3085 ret |= get_user(rtdev, &(ur4->rt_dev)); 3086 if (rtdev) { 3087 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3088 r4.rt_dev = (char __user __force *)devname; 3089 devname[15] = 0; 3090 } else 3091 r4.rt_dev = NULL; 3092 3093 r = (void *) &r4; 3094 } 3095 3096 if (ret) { 3097 ret = -EFAULT; 3098 goto out; 3099 } 3100 3101 set_fs(KERNEL_DS); 3102 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3103 set_fs(old_fs); 3104 3105 out: 3106 return ret; 3107 } 3108 3109 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3110 * for some operations; this forces use of the newer bridge-utils that 3111 * use compatible ioctls 3112 */ 3113 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3114 { 3115 compat_ulong_t tmp; 3116 3117 if (get_user(tmp, argp)) 3118 return -EFAULT; 3119 if (tmp == BRCTL_GET_VERSION) 3120 return BRCTL_VERSION + 1; 3121 return -EINVAL; 3122 } 3123 3124 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3125 unsigned int cmd, unsigned long arg) 3126 { 3127 void __user *argp = compat_ptr(arg); 3128 struct sock *sk = sock->sk; 3129 struct net *net = sock_net(sk); 3130 3131 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3132 return compat_ifr_data_ioctl(net, cmd, argp); 3133 3134 switch (cmd) { 3135 case SIOCSIFBR: 3136 case SIOCGIFBR: 3137 return old_bridge_ioctl(argp); 3138 case SIOCGIFCONF: 3139 return compat_dev_ifconf(net, argp); 3140 case SIOCETHTOOL: 3141 return ethtool_ioctl(net, argp); 3142 case SIOCWANDEV: 3143 return compat_siocwandev(net, argp); 3144 case SIOCGIFMAP: 3145 case SIOCSIFMAP: 3146 return compat_sioc_ifmap(net, cmd, argp); 3147 case SIOCADDRT: 3148 case SIOCDELRT: 3149 return routing_ioctl(net, sock, cmd, argp); 3150 case SIOCGSTAMP: 3151 return do_siocgstamp(net, sock, cmd, argp); 3152 case SIOCGSTAMPNS: 3153 return do_siocgstampns(net, sock, cmd, argp); 3154 case SIOCBONDSLAVEINFOQUERY: 3155 case SIOCBONDINFOQUERY: 3156 case SIOCSHWTSTAMP: 3157 case SIOCGHWTSTAMP: 3158 return compat_ifr_data_ioctl(net, cmd, argp); 3159 3160 case FIOSETOWN: 3161 case SIOCSPGRP: 3162 case FIOGETOWN: 3163 case SIOCGPGRP: 3164 case SIOCBRADDBR: 3165 case SIOCBRDELBR: 3166 case SIOCGIFVLAN: 3167 case SIOCSIFVLAN: 3168 case SIOCADDDLCI: 3169 case SIOCDELDLCI: 3170 case SIOCGSKNS: 3171 return sock_ioctl(file, cmd, arg); 3172 3173 case SIOCGIFFLAGS: 3174 case SIOCSIFFLAGS: 3175 case SIOCGIFMETRIC: 3176 case SIOCSIFMETRIC: 3177 case SIOCGIFMTU: 3178 case SIOCSIFMTU: 3179 case SIOCGIFMEM: 3180 case SIOCSIFMEM: 3181 case SIOCGIFHWADDR: 3182 case SIOCSIFHWADDR: 3183 case SIOCADDMULTI: 3184 case SIOCDELMULTI: 3185 case SIOCGIFINDEX: 3186 case SIOCGIFADDR: 3187 case SIOCSIFADDR: 3188 case SIOCSIFHWBROADCAST: 3189 case SIOCDIFADDR: 3190 case SIOCGIFBRDADDR: 3191 case SIOCSIFBRDADDR: 3192 case SIOCGIFDSTADDR: 3193 case SIOCSIFDSTADDR: 3194 case SIOCGIFNETMASK: 3195 case SIOCSIFNETMASK: 3196 case SIOCSIFPFLAGS: 3197 case SIOCGIFPFLAGS: 3198 case SIOCGIFTXQLEN: 3199 case SIOCSIFTXQLEN: 3200 case SIOCBRADDIF: 3201 case SIOCBRDELIF: 3202 case SIOCSIFNAME: 3203 case SIOCGMIIPHY: 3204 case SIOCGMIIREG: 3205 case SIOCSMIIREG: 3206 case SIOCSARP: 3207 case SIOCGARP: 3208 case SIOCDARP: 3209 case SIOCATMARK: 3210 case SIOCBONDENSLAVE: 3211 case SIOCBONDRELEASE: 3212 case SIOCBONDSETHWADDR: 3213 case SIOCBONDCHANGEACTIVE: 3214 case SIOCGIFNAME: 3215 return sock_do_ioctl(net, sock, cmd, arg); 3216 } 3217 3218 return -ENOIOCTLCMD; 3219 } 3220 3221 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3222 unsigned long arg) 3223 { 3224 struct socket *sock = file->private_data; 3225 int ret = -ENOIOCTLCMD; 3226 struct sock *sk; 3227 struct net *net; 3228 3229 sk = sock->sk; 3230 net = sock_net(sk); 3231 3232 if (sock->ops->compat_ioctl) 3233 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3234 3235 if (ret == -ENOIOCTLCMD && 3236 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3237 ret = compat_wext_handle_ioctl(net, cmd, arg); 3238 3239 if (ret == -ENOIOCTLCMD) 3240 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3241 3242 return ret; 3243 } 3244 #endif 3245 3246 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3247 { 3248 return sock->ops->bind(sock, addr, addrlen); 3249 } 3250 EXPORT_SYMBOL(kernel_bind); 3251 3252 int kernel_listen(struct socket *sock, int backlog) 3253 { 3254 return sock->ops->listen(sock, backlog); 3255 } 3256 EXPORT_SYMBOL(kernel_listen); 3257 3258 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3259 { 3260 struct sock *sk = sock->sk; 3261 int err; 3262 3263 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3264 newsock); 3265 if (err < 0) 3266 goto done; 3267 3268 err = sock->ops->accept(sock, *newsock, flags, true); 3269 if (err < 0) { 3270 sock_release(*newsock); 3271 *newsock = NULL; 3272 goto done; 3273 } 3274 3275 (*newsock)->ops = sock->ops; 3276 __module_get((*newsock)->ops->owner); 3277 3278 done: 3279 return err; 3280 } 3281 EXPORT_SYMBOL(kernel_accept); 3282 3283 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3284 int flags) 3285 { 3286 return sock->ops->connect(sock, addr, addrlen, flags); 3287 } 3288 EXPORT_SYMBOL(kernel_connect); 3289 3290 int kernel_getsockname(struct socket *sock, struct sockaddr *addr) 3291 { 3292 return sock->ops->getname(sock, addr, 0); 3293 } 3294 EXPORT_SYMBOL(kernel_getsockname); 3295 3296 int kernel_getpeername(struct socket *sock, struct sockaddr *addr) 3297 { 3298 return sock->ops->getname(sock, addr, 1); 3299 } 3300 EXPORT_SYMBOL(kernel_getpeername); 3301 3302 int kernel_getsockopt(struct socket *sock, int level, int optname, 3303 char *optval, int *optlen) 3304 { 3305 mm_segment_t oldfs = get_fs(); 3306 char __user *uoptval; 3307 int __user *uoptlen; 3308 int err; 3309 3310 uoptval = (char __user __force *) optval; 3311 uoptlen = (int __user __force *) optlen; 3312 3313 set_fs(KERNEL_DS); 3314 if (level == SOL_SOCKET) 3315 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3316 else 3317 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3318 uoptlen); 3319 set_fs(oldfs); 3320 return err; 3321 } 3322 EXPORT_SYMBOL(kernel_getsockopt); 3323 3324 int kernel_setsockopt(struct socket *sock, int level, int optname, 3325 char *optval, unsigned int optlen) 3326 { 3327 mm_segment_t oldfs = get_fs(); 3328 char __user *uoptval; 3329 int err; 3330 3331 uoptval = (char __user __force *) optval; 3332 3333 set_fs(KERNEL_DS); 3334 if (level == SOL_SOCKET) 3335 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3336 else 3337 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3338 optlen); 3339 set_fs(oldfs); 3340 return err; 3341 } 3342 EXPORT_SYMBOL(kernel_setsockopt); 3343 3344 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3345 size_t size, int flags) 3346 { 3347 if (sock->ops->sendpage) 3348 return sock->ops->sendpage(sock, page, offset, size, flags); 3349 3350 return sock_no_sendpage(sock, page, offset, size, flags); 3351 } 3352 EXPORT_SYMBOL(kernel_sendpage); 3353 3354 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3355 size_t size, int flags) 3356 { 3357 struct socket *sock = sk->sk_socket; 3358 3359 if (sock->ops->sendpage_locked) 3360 return sock->ops->sendpage_locked(sk, page, offset, size, 3361 flags); 3362 3363 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3364 } 3365 EXPORT_SYMBOL(kernel_sendpage_locked); 3366 3367 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3368 { 3369 return sock->ops->shutdown(sock, how); 3370 } 3371 EXPORT_SYMBOL(kernel_sock_shutdown); 3372 3373 /* This routine returns the IP overhead imposed by a socket i.e. 3374 * the length of the underlying IP header, depending on whether 3375 * this is an IPv4 or IPv6 socket and the length from IP options turned 3376 * on at the socket. Assumes that the caller has a lock on the socket. 3377 */ 3378 u32 kernel_sock_ip_overhead(struct sock *sk) 3379 { 3380 struct inet_sock *inet; 3381 struct ip_options_rcu *opt; 3382 u32 overhead = 0; 3383 #if IS_ENABLED(CONFIG_IPV6) 3384 struct ipv6_pinfo *np; 3385 struct ipv6_txoptions *optv6 = NULL; 3386 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3387 3388 if (!sk) 3389 return overhead; 3390 3391 switch (sk->sk_family) { 3392 case AF_INET: 3393 inet = inet_sk(sk); 3394 overhead += sizeof(struct iphdr); 3395 opt = rcu_dereference_protected(inet->inet_opt, 3396 sock_owned_by_user(sk)); 3397 if (opt) 3398 overhead += opt->opt.optlen; 3399 return overhead; 3400 #if IS_ENABLED(CONFIG_IPV6) 3401 case AF_INET6: 3402 np = inet6_sk(sk); 3403 overhead += sizeof(struct ipv6hdr); 3404 if (np) 3405 optv6 = rcu_dereference_protected(np->opt, 3406 sock_owned_by_user(sk)); 3407 if (optv6) 3408 overhead += (optv6->opt_flen + optv6->opt_nflen); 3409 return overhead; 3410 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3411 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3412 return overhead; 3413 } 3414 } 3415 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3416