1 /* 2 * NET An implementation of the SOCKET network access protocol. 3 * 4 * Version: @(#)socket.c 1.1.93 18/02/95 5 * 6 * Authors: Orest Zborowski, <obz@Kodak.COM> 7 * Ross Biro 8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 9 * 10 * Fixes: 11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in 12 * shutdown() 13 * Alan Cox : verify_area() fixes 14 * Alan Cox : Removed DDI 15 * Jonathan Kamens : SOCK_DGRAM reconnect bug 16 * Alan Cox : Moved a load of checks to the very 17 * top level. 18 * Alan Cox : Move address structures to/from user 19 * mode above the protocol layers. 20 * Rob Janssen : Allow 0 length sends. 21 * Alan Cox : Asynchronous I/O support (cribbed from the 22 * tty drivers). 23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 24 * Jeff Uphoff : Made max number of sockets command-line 25 * configurable. 26 * Matti Aarnio : Made the number of sockets dynamic, 27 * to be allocated when needed, and mr. 28 * Uphoff's max is used as max to be 29 * allowed to allocate. 30 * Linus : Argh. removed all the socket allocation 31 * altogether: it's in the inode now. 32 * Alan Cox : Made sock_alloc()/sock_release() public 33 * for NetROM and future kernel nfsd type 34 * stuff. 35 * Alan Cox : sendmsg/recvmsg basics. 36 * Tom Dyas : Export net symbols. 37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 38 * Alan Cox : Added thread locking to sys_* calls 39 * for sockets. May have errors at the 40 * moment. 41 * Kevin Buhr : Fixed the dumb errors in the above. 42 * Andi Kleen : Some small cleanups, optimizations, 43 * and fixed a copy_from_user() bug. 44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 45 * Tigran Aivazian : Made listen(2) backlog sanity checks 46 * protocol-independent 47 * 48 * 49 * This program is free software; you can redistribute it and/or 50 * modify it under the terms of the GNU General Public License 51 * as published by the Free Software Foundation; either version 52 * 2 of the License, or (at your option) any later version. 53 * 54 * 55 * This module is effectively the top level interface to the BSD socket 56 * paradigm. 57 * 58 * Based upon Swansea University Computer Society NET3.039 59 */ 60 61 #include <linux/mm.h> 62 #include <linux/socket.h> 63 #include <linux/file.h> 64 #include <linux/net.h> 65 #include <linux/interrupt.h> 66 #include <linux/thread_info.h> 67 #include <linux/rcupdate.h> 68 #include <linux/netdevice.h> 69 #include <linux/proc_fs.h> 70 #include <linux/seq_file.h> 71 #include <linux/mutex.h> 72 #include <linux/if_bridge.h> 73 #include <linux/if_frad.h> 74 #include <linux/if_vlan.h> 75 #include <linux/ptp_classify.h> 76 #include <linux/init.h> 77 #include <linux/poll.h> 78 #include <linux/cache.h> 79 #include <linux/module.h> 80 #include <linux/highmem.h> 81 #include <linux/mount.h> 82 #include <linux/security.h> 83 #include <linux/syscalls.h> 84 #include <linux/compat.h> 85 #include <linux/kmod.h> 86 #include <linux/audit.h> 87 #include <linux/wireless.h> 88 #include <linux/nsproxy.h> 89 #include <linux/magic.h> 90 #include <linux/slab.h> 91 #include <linux/xattr.h> 92 93 #include <linux/uaccess.h> 94 #include <asm/unistd.h> 95 96 #include <net/compat.h> 97 #include <net/wext.h> 98 #include <net/cls_cgroup.h> 99 100 #include <net/sock.h> 101 #include <linux/netfilter.h> 102 103 #include <linux/if_tun.h> 104 #include <linux/ipv6_route.h> 105 #include <linux/route.h> 106 #include <linux/sockios.h> 107 #include <linux/atalk.h> 108 #include <net/busy_poll.h> 109 #include <linux/errqueue.h> 110 111 #ifdef CONFIG_NET_RX_BUSY_POLL 112 unsigned int sysctl_net_busy_read __read_mostly; 113 unsigned int sysctl_net_busy_poll __read_mostly; 114 #endif 115 116 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 117 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 118 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 119 120 static int sock_close(struct inode *inode, struct file *file); 121 static unsigned int sock_poll(struct file *file, 122 struct poll_table_struct *wait); 123 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 124 #ifdef CONFIG_COMPAT 125 static long compat_sock_ioctl(struct file *file, 126 unsigned int cmd, unsigned long arg); 127 #endif 128 static int sock_fasync(int fd, struct file *filp, int on); 129 static ssize_t sock_sendpage(struct file *file, struct page *page, 130 int offset, size_t size, loff_t *ppos, int more); 131 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 132 struct pipe_inode_info *pipe, size_t len, 133 unsigned int flags); 134 135 /* 136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 137 * in the operation structures but are done directly via the socketcall() multiplexor. 138 */ 139 140 static const struct file_operations socket_file_ops = { 141 .owner = THIS_MODULE, 142 .llseek = no_llseek, 143 .read_iter = sock_read_iter, 144 .write_iter = sock_write_iter, 145 .poll = sock_poll, 146 .unlocked_ioctl = sock_ioctl, 147 #ifdef CONFIG_COMPAT 148 .compat_ioctl = compat_sock_ioctl, 149 #endif 150 .mmap = sock_mmap, 151 .release = sock_close, 152 .fasync = sock_fasync, 153 .sendpage = sock_sendpage, 154 .splice_write = generic_splice_sendpage, 155 .splice_read = sock_splice_read, 156 }; 157 158 /* 159 * The protocol list. Each protocol is registered in here. 160 */ 161 162 static DEFINE_SPINLOCK(net_family_lock); 163 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 164 165 /* 166 * Support routines. 167 * Move socket addresses back and forth across the kernel/user 168 * divide and look after the messy bits. 169 */ 170 171 /** 172 * move_addr_to_kernel - copy a socket address into kernel space 173 * @uaddr: Address in user space 174 * @kaddr: Address in kernel space 175 * @ulen: Length in user space 176 * 177 * The address is copied into kernel space. If the provided address is 178 * too long an error code of -EINVAL is returned. If the copy gives 179 * invalid addresses -EFAULT is returned. On a success 0 is returned. 180 */ 181 182 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 183 { 184 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 185 return -EINVAL; 186 if (ulen == 0) 187 return 0; 188 if (copy_from_user(kaddr, uaddr, ulen)) 189 return -EFAULT; 190 return audit_sockaddr(ulen, kaddr); 191 } 192 193 /** 194 * move_addr_to_user - copy an address to user space 195 * @kaddr: kernel space address 196 * @klen: length of address in kernel 197 * @uaddr: user space address 198 * @ulen: pointer to user length field 199 * 200 * The value pointed to by ulen on entry is the buffer length available. 201 * This is overwritten with the buffer space used. -EINVAL is returned 202 * if an overlong buffer is specified or a negative buffer size. -EFAULT 203 * is returned if either the buffer or the length field are not 204 * accessible. 205 * After copying the data up to the limit the user specifies, the true 206 * length of the data is written over the length limit the user 207 * specified. Zero is returned for a success. 208 */ 209 210 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 211 void __user *uaddr, int __user *ulen) 212 { 213 int err; 214 int len; 215 216 BUG_ON(klen > sizeof(struct sockaddr_storage)); 217 err = get_user(len, ulen); 218 if (err) 219 return err; 220 if (len > klen) 221 len = klen; 222 if (len < 0) 223 return -EINVAL; 224 if (len) { 225 if (audit_sockaddr(klen, kaddr)) 226 return -ENOMEM; 227 if (copy_to_user(uaddr, kaddr, len)) 228 return -EFAULT; 229 } 230 /* 231 * "fromlen shall refer to the value before truncation.." 232 * 1003.1g 233 */ 234 return __put_user(klen, ulen); 235 } 236 237 static struct kmem_cache *sock_inode_cachep __read_mostly; 238 239 static struct inode *sock_alloc_inode(struct super_block *sb) 240 { 241 struct socket_alloc *ei; 242 struct socket_wq *wq; 243 244 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 245 if (!ei) 246 return NULL; 247 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 248 if (!wq) { 249 kmem_cache_free(sock_inode_cachep, ei); 250 return NULL; 251 } 252 init_waitqueue_head(&wq->wait); 253 wq->fasync_list = NULL; 254 wq->flags = 0; 255 RCU_INIT_POINTER(ei->socket.wq, wq); 256 257 ei->socket.state = SS_UNCONNECTED; 258 ei->socket.flags = 0; 259 ei->socket.ops = NULL; 260 ei->socket.sk = NULL; 261 ei->socket.file = NULL; 262 263 return &ei->vfs_inode; 264 } 265 266 static void sock_destroy_inode(struct inode *inode) 267 { 268 struct socket_alloc *ei; 269 struct socket_wq *wq; 270 271 ei = container_of(inode, struct socket_alloc, vfs_inode); 272 wq = rcu_dereference_protected(ei->socket.wq, 1); 273 kfree_rcu(wq, rcu); 274 kmem_cache_free(sock_inode_cachep, ei); 275 } 276 277 static void init_once(void *foo) 278 { 279 struct socket_alloc *ei = (struct socket_alloc *)foo; 280 281 inode_init_once(&ei->vfs_inode); 282 } 283 284 static void init_inodecache(void) 285 { 286 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 287 sizeof(struct socket_alloc), 288 0, 289 (SLAB_HWCACHE_ALIGN | 290 SLAB_RECLAIM_ACCOUNT | 291 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 292 init_once); 293 BUG_ON(sock_inode_cachep == NULL); 294 } 295 296 static const struct super_operations sockfs_ops = { 297 .alloc_inode = sock_alloc_inode, 298 .destroy_inode = sock_destroy_inode, 299 .statfs = simple_statfs, 300 }; 301 302 /* 303 * sockfs_dname() is called from d_path(). 304 */ 305 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 306 { 307 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 308 d_inode(dentry)->i_ino); 309 } 310 311 static const struct dentry_operations sockfs_dentry_operations = { 312 .d_dname = sockfs_dname, 313 }; 314 315 static int sockfs_xattr_get(const struct xattr_handler *handler, 316 struct dentry *dentry, struct inode *inode, 317 const char *suffix, void *value, size_t size) 318 { 319 if (value) { 320 if (dentry->d_name.len + 1 > size) 321 return -ERANGE; 322 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 323 } 324 return dentry->d_name.len + 1; 325 } 326 327 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 328 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 329 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 330 331 static const struct xattr_handler sockfs_xattr_handler = { 332 .name = XATTR_NAME_SOCKPROTONAME, 333 .get = sockfs_xattr_get, 334 }; 335 336 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 337 struct dentry *dentry, struct inode *inode, 338 const char *suffix, const void *value, 339 size_t size, int flags) 340 { 341 /* Handled by LSM. */ 342 return -EAGAIN; 343 } 344 345 static const struct xattr_handler sockfs_security_xattr_handler = { 346 .prefix = XATTR_SECURITY_PREFIX, 347 .set = sockfs_security_xattr_set, 348 }; 349 350 static const struct xattr_handler *sockfs_xattr_handlers[] = { 351 &sockfs_xattr_handler, 352 &sockfs_security_xattr_handler, 353 NULL 354 }; 355 356 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 357 int flags, const char *dev_name, void *data) 358 { 359 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 360 sockfs_xattr_handlers, 361 &sockfs_dentry_operations, SOCKFS_MAGIC); 362 } 363 364 static struct vfsmount *sock_mnt __read_mostly; 365 366 static struct file_system_type sock_fs_type = { 367 .name = "sockfs", 368 .mount = sockfs_mount, 369 .kill_sb = kill_anon_super, 370 }; 371 372 /* 373 * Obtains the first available file descriptor and sets it up for use. 374 * 375 * These functions create file structures and maps them to fd space 376 * of the current process. On success it returns file descriptor 377 * and file struct implicitly stored in sock->file. 378 * Note that another thread may close file descriptor before we return 379 * from this function. We use the fact that now we do not refer 380 * to socket after mapping. If one day we will need it, this 381 * function will increment ref. count on file by 1. 382 * 383 * In any case returned fd MAY BE not valid! 384 * This race condition is unavoidable 385 * with shared fd spaces, we cannot solve it inside kernel, 386 * but we take care of internal coherence yet. 387 */ 388 389 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 390 { 391 struct qstr name = { .name = "" }; 392 struct path path; 393 struct file *file; 394 395 if (dname) { 396 name.name = dname; 397 name.len = strlen(name.name); 398 } else if (sock->sk) { 399 name.name = sock->sk->sk_prot_creator->name; 400 name.len = strlen(name.name); 401 } 402 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 403 if (unlikely(!path.dentry)) { 404 sock_release(sock); 405 return ERR_PTR(-ENOMEM); 406 } 407 path.mnt = mntget(sock_mnt); 408 409 d_instantiate(path.dentry, SOCK_INODE(sock)); 410 411 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 412 &socket_file_ops); 413 if (IS_ERR(file)) { 414 /* drop dentry, keep inode for a bit */ 415 ihold(d_inode(path.dentry)); 416 path_put(&path); 417 /* ... and now kill it properly */ 418 sock_release(sock); 419 return file; 420 } 421 422 sock->file = file; 423 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 424 file->private_data = sock; 425 return file; 426 } 427 EXPORT_SYMBOL(sock_alloc_file); 428 429 static int sock_map_fd(struct socket *sock, int flags) 430 { 431 struct file *newfile; 432 int fd = get_unused_fd_flags(flags); 433 if (unlikely(fd < 0)) 434 return fd; 435 436 newfile = sock_alloc_file(sock, flags, NULL); 437 if (likely(!IS_ERR(newfile))) { 438 fd_install(fd, newfile); 439 return fd; 440 } 441 442 put_unused_fd(fd); 443 return PTR_ERR(newfile); 444 } 445 446 struct socket *sock_from_file(struct file *file, int *err) 447 { 448 if (file->f_op == &socket_file_ops) 449 return file->private_data; /* set in sock_map_fd */ 450 451 *err = -ENOTSOCK; 452 return NULL; 453 } 454 EXPORT_SYMBOL(sock_from_file); 455 456 /** 457 * sockfd_lookup - Go from a file number to its socket slot 458 * @fd: file handle 459 * @err: pointer to an error code return 460 * 461 * The file handle passed in is locked and the socket it is bound 462 * to is returned. If an error occurs the err pointer is overwritten 463 * with a negative errno code and NULL is returned. The function checks 464 * for both invalid handles and passing a handle which is not a socket. 465 * 466 * On a success the socket object pointer is returned. 467 */ 468 469 struct socket *sockfd_lookup(int fd, int *err) 470 { 471 struct file *file; 472 struct socket *sock; 473 474 file = fget(fd); 475 if (!file) { 476 *err = -EBADF; 477 return NULL; 478 } 479 480 sock = sock_from_file(file, err); 481 if (!sock) 482 fput(file); 483 return sock; 484 } 485 EXPORT_SYMBOL(sockfd_lookup); 486 487 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 488 { 489 struct fd f = fdget(fd); 490 struct socket *sock; 491 492 *err = -EBADF; 493 if (f.file) { 494 sock = sock_from_file(f.file, err); 495 if (likely(sock)) { 496 *fput_needed = f.flags; 497 return sock; 498 } 499 fdput(f); 500 } 501 return NULL; 502 } 503 504 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 505 size_t size) 506 { 507 ssize_t len; 508 ssize_t used = 0; 509 510 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 511 if (len < 0) 512 return len; 513 used += len; 514 if (buffer) { 515 if (size < used) 516 return -ERANGE; 517 buffer += len; 518 } 519 520 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 521 used += len; 522 if (buffer) { 523 if (size < used) 524 return -ERANGE; 525 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 526 buffer += len; 527 } 528 529 return used; 530 } 531 532 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 533 { 534 int err = simple_setattr(dentry, iattr); 535 536 if (!err && (iattr->ia_valid & ATTR_UID)) { 537 struct socket *sock = SOCKET_I(d_inode(dentry)); 538 539 sock->sk->sk_uid = iattr->ia_uid; 540 } 541 542 return err; 543 } 544 545 static const struct inode_operations sockfs_inode_ops = { 546 .listxattr = sockfs_listxattr, 547 .setattr = sockfs_setattr, 548 }; 549 550 /** 551 * sock_alloc - allocate a socket 552 * 553 * Allocate a new inode and socket object. The two are bound together 554 * and initialised. The socket is then returned. If we are out of inodes 555 * NULL is returned. 556 */ 557 558 struct socket *sock_alloc(void) 559 { 560 struct inode *inode; 561 struct socket *sock; 562 563 inode = new_inode_pseudo(sock_mnt->mnt_sb); 564 if (!inode) 565 return NULL; 566 567 sock = SOCKET_I(inode); 568 569 inode->i_ino = get_next_ino(); 570 inode->i_mode = S_IFSOCK | S_IRWXUGO; 571 inode->i_uid = current_fsuid(); 572 inode->i_gid = current_fsgid(); 573 inode->i_op = &sockfs_inode_ops; 574 575 return sock; 576 } 577 EXPORT_SYMBOL(sock_alloc); 578 579 /** 580 * sock_release - close a socket 581 * @sock: socket to close 582 * 583 * The socket is released from the protocol stack if it has a release 584 * callback, and the inode is then released if the socket is bound to 585 * an inode not a file. 586 */ 587 588 void sock_release(struct socket *sock) 589 { 590 if (sock->ops) { 591 struct module *owner = sock->ops->owner; 592 593 sock->ops->release(sock); 594 sock->ops = NULL; 595 module_put(owner); 596 } 597 598 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 599 pr_err("%s: fasync list not empty!\n", __func__); 600 601 if (!sock->file) { 602 iput(SOCK_INODE(sock)); 603 return; 604 } 605 sock->file = NULL; 606 } 607 EXPORT_SYMBOL(sock_release); 608 609 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 610 { 611 u8 flags = *tx_flags; 612 613 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 614 flags |= SKBTX_HW_TSTAMP; 615 616 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 617 flags |= SKBTX_SW_TSTAMP; 618 619 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 620 flags |= SKBTX_SCHED_TSTAMP; 621 622 *tx_flags = flags; 623 } 624 EXPORT_SYMBOL(__sock_tx_timestamp); 625 626 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 627 { 628 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 629 BUG_ON(ret == -EIOCBQUEUED); 630 return ret; 631 } 632 633 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 634 { 635 int err = security_socket_sendmsg(sock, msg, 636 msg_data_left(msg)); 637 638 return err ?: sock_sendmsg_nosec(sock, msg); 639 } 640 EXPORT_SYMBOL(sock_sendmsg); 641 642 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 643 struct kvec *vec, size_t num, size_t size) 644 { 645 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 646 return sock_sendmsg(sock, msg); 647 } 648 EXPORT_SYMBOL(kernel_sendmsg); 649 650 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 651 struct kvec *vec, size_t num, size_t size) 652 { 653 struct socket *sock = sk->sk_socket; 654 655 if (!sock->ops->sendmsg_locked) 656 return sock_no_sendmsg_locked(sk, msg, size); 657 658 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 659 660 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 661 } 662 EXPORT_SYMBOL(kernel_sendmsg_locked); 663 664 static bool skb_is_err_queue(const struct sk_buff *skb) 665 { 666 /* pkt_type of skbs enqueued on the error queue are set to 667 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 668 * in recvmsg, since skbs received on a local socket will never 669 * have a pkt_type of PACKET_OUTGOING. 670 */ 671 return skb->pkt_type == PACKET_OUTGOING; 672 } 673 674 /* On transmit, software and hardware timestamps are returned independently. 675 * As the two skb clones share the hardware timestamp, which may be updated 676 * before the software timestamp is received, a hardware TX timestamp may be 677 * returned only if there is no software TX timestamp. Ignore false software 678 * timestamps, which may be made in the __sock_recv_timestamp() call when the 679 * option SO_TIMESTAMP(NS) is enabled on the socket, even when the skb has a 680 * hardware timestamp. 681 */ 682 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 683 { 684 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 685 } 686 687 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 688 { 689 struct scm_ts_pktinfo ts_pktinfo; 690 struct net_device *orig_dev; 691 692 if (!skb_mac_header_was_set(skb)) 693 return; 694 695 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 696 697 rcu_read_lock(); 698 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 699 if (orig_dev) 700 ts_pktinfo.if_index = orig_dev->ifindex; 701 rcu_read_unlock(); 702 703 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 704 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 705 sizeof(ts_pktinfo), &ts_pktinfo); 706 } 707 708 /* 709 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 710 */ 711 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 712 struct sk_buff *skb) 713 { 714 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 715 struct scm_timestamping tss; 716 int empty = 1, false_tstamp = 0; 717 struct skb_shared_hwtstamps *shhwtstamps = 718 skb_hwtstamps(skb); 719 720 /* Race occurred between timestamp enabling and packet 721 receiving. Fill in the current time for now. */ 722 if (need_software_tstamp && skb->tstamp == 0) { 723 __net_timestamp(skb); 724 false_tstamp = 1; 725 } 726 727 if (need_software_tstamp) { 728 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 729 struct timeval tv; 730 skb_get_timestamp(skb, &tv); 731 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 732 sizeof(tv), &tv); 733 } else { 734 struct timespec ts; 735 skb_get_timestampns(skb, &ts); 736 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 737 sizeof(ts), &ts); 738 } 739 } 740 741 memset(&tss, 0, sizeof(tss)); 742 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 743 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 744 empty = 0; 745 if (shhwtstamps && 746 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 747 !skb_is_swtx_tstamp(skb, false_tstamp) && 748 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 749 empty = 0; 750 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 751 !skb_is_err_queue(skb)) 752 put_ts_pktinfo(msg, skb); 753 } 754 if (!empty) { 755 put_cmsg(msg, SOL_SOCKET, 756 SCM_TIMESTAMPING, sizeof(tss), &tss); 757 758 if (skb_is_err_queue(skb) && skb->len && 759 SKB_EXT_ERR(skb)->opt_stats) 760 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 761 skb->len, skb->data); 762 } 763 } 764 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 765 766 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 767 struct sk_buff *skb) 768 { 769 int ack; 770 771 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 772 return; 773 if (!skb->wifi_acked_valid) 774 return; 775 776 ack = skb->wifi_acked; 777 778 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 779 } 780 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 781 782 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 783 struct sk_buff *skb) 784 { 785 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 786 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 787 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 788 } 789 790 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 791 struct sk_buff *skb) 792 { 793 sock_recv_timestamp(msg, sk, skb); 794 sock_recv_drops(msg, sk, skb); 795 } 796 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 797 798 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 799 int flags) 800 { 801 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 802 } 803 804 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 805 { 806 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 807 808 return err ?: sock_recvmsg_nosec(sock, msg, flags); 809 } 810 EXPORT_SYMBOL(sock_recvmsg); 811 812 /** 813 * kernel_recvmsg - Receive a message from a socket (kernel space) 814 * @sock: The socket to receive the message from 815 * @msg: Received message 816 * @vec: Input s/g array for message data 817 * @num: Size of input s/g array 818 * @size: Number of bytes to read 819 * @flags: Message flags (MSG_DONTWAIT, etc...) 820 * 821 * On return the msg structure contains the scatter/gather array passed in the 822 * vec argument. The array is modified so that it consists of the unfilled 823 * portion of the original array. 824 * 825 * The returned value is the total number of bytes received, or an error. 826 */ 827 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 828 struct kvec *vec, size_t num, size_t size, int flags) 829 { 830 mm_segment_t oldfs = get_fs(); 831 int result; 832 833 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); 834 set_fs(KERNEL_DS); 835 result = sock_recvmsg(sock, msg, flags); 836 set_fs(oldfs); 837 return result; 838 } 839 EXPORT_SYMBOL(kernel_recvmsg); 840 841 static ssize_t sock_sendpage(struct file *file, struct page *page, 842 int offset, size_t size, loff_t *ppos, int more) 843 { 844 struct socket *sock; 845 int flags; 846 847 sock = file->private_data; 848 849 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 850 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 851 flags |= more; 852 853 return kernel_sendpage(sock, page, offset, size, flags); 854 } 855 856 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 857 struct pipe_inode_info *pipe, size_t len, 858 unsigned int flags) 859 { 860 struct socket *sock = file->private_data; 861 862 if (unlikely(!sock->ops->splice_read)) 863 return -EINVAL; 864 865 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 866 } 867 868 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 869 { 870 struct file *file = iocb->ki_filp; 871 struct socket *sock = file->private_data; 872 struct msghdr msg = {.msg_iter = *to, 873 .msg_iocb = iocb}; 874 ssize_t res; 875 876 if (file->f_flags & O_NONBLOCK) 877 msg.msg_flags = MSG_DONTWAIT; 878 879 if (iocb->ki_pos != 0) 880 return -ESPIPE; 881 882 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 883 return 0; 884 885 res = sock_recvmsg(sock, &msg, msg.msg_flags); 886 *to = msg.msg_iter; 887 return res; 888 } 889 890 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 891 { 892 struct file *file = iocb->ki_filp; 893 struct socket *sock = file->private_data; 894 struct msghdr msg = {.msg_iter = *from, 895 .msg_iocb = iocb}; 896 ssize_t res; 897 898 if (iocb->ki_pos != 0) 899 return -ESPIPE; 900 901 if (file->f_flags & O_NONBLOCK) 902 msg.msg_flags = MSG_DONTWAIT; 903 904 if (sock->type == SOCK_SEQPACKET) 905 msg.msg_flags |= MSG_EOR; 906 907 res = sock_sendmsg(sock, &msg); 908 *from = msg.msg_iter; 909 return res; 910 } 911 912 /* 913 * Atomic setting of ioctl hooks to avoid race 914 * with module unload. 915 */ 916 917 static DEFINE_MUTEX(br_ioctl_mutex); 918 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 919 920 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 921 { 922 mutex_lock(&br_ioctl_mutex); 923 br_ioctl_hook = hook; 924 mutex_unlock(&br_ioctl_mutex); 925 } 926 EXPORT_SYMBOL(brioctl_set); 927 928 static DEFINE_MUTEX(vlan_ioctl_mutex); 929 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 930 931 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 932 { 933 mutex_lock(&vlan_ioctl_mutex); 934 vlan_ioctl_hook = hook; 935 mutex_unlock(&vlan_ioctl_mutex); 936 } 937 EXPORT_SYMBOL(vlan_ioctl_set); 938 939 static DEFINE_MUTEX(dlci_ioctl_mutex); 940 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 941 942 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 943 { 944 mutex_lock(&dlci_ioctl_mutex); 945 dlci_ioctl_hook = hook; 946 mutex_unlock(&dlci_ioctl_mutex); 947 } 948 EXPORT_SYMBOL(dlci_ioctl_set); 949 950 static long sock_do_ioctl(struct net *net, struct socket *sock, 951 unsigned int cmd, unsigned long arg) 952 { 953 int err; 954 void __user *argp = (void __user *)arg; 955 956 err = sock->ops->ioctl(sock, cmd, arg); 957 958 /* 959 * If this ioctl is unknown try to hand it down 960 * to the NIC driver. 961 */ 962 if (err == -ENOIOCTLCMD) 963 err = dev_ioctl(net, cmd, argp); 964 965 return err; 966 } 967 968 /* 969 * With an ioctl, arg may well be a user mode pointer, but we don't know 970 * what to do with it - that's up to the protocol still. 971 */ 972 973 static struct ns_common *get_net_ns(struct ns_common *ns) 974 { 975 return &get_net(container_of(ns, struct net, ns))->ns; 976 } 977 978 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 979 { 980 struct socket *sock; 981 struct sock *sk; 982 void __user *argp = (void __user *)arg; 983 int pid, err; 984 struct net *net; 985 986 sock = file->private_data; 987 sk = sock->sk; 988 net = sock_net(sk); 989 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 990 err = dev_ioctl(net, cmd, argp); 991 } else 992 #ifdef CONFIG_WEXT_CORE 993 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 994 err = dev_ioctl(net, cmd, argp); 995 } else 996 #endif 997 switch (cmd) { 998 case FIOSETOWN: 999 case SIOCSPGRP: 1000 err = -EFAULT; 1001 if (get_user(pid, (int __user *)argp)) 1002 break; 1003 err = f_setown(sock->file, pid, 1); 1004 break; 1005 case FIOGETOWN: 1006 case SIOCGPGRP: 1007 err = put_user(f_getown(sock->file), 1008 (int __user *)argp); 1009 break; 1010 case SIOCGIFBR: 1011 case SIOCSIFBR: 1012 case SIOCBRADDBR: 1013 case SIOCBRDELBR: 1014 err = -ENOPKG; 1015 if (!br_ioctl_hook) 1016 request_module("bridge"); 1017 1018 mutex_lock(&br_ioctl_mutex); 1019 if (br_ioctl_hook) 1020 err = br_ioctl_hook(net, cmd, argp); 1021 mutex_unlock(&br_ioctl_mutex); 1022 break; 1023 case SIOCGIFVLAN: 1024 case SIOCSIFVLAN: 1025 err = -ENOPKG; 1026 if (!vlan_ioctl_hook) 1027 request_module("8021q"); 1028 1029 mutex_lock(&vlan_ioctl_mutex); 1030 if (vlan_ioctl_hook) 1031 err = vlan_ioctl_hook(net, argp); 1032 mutex_unlock(&vlan_ioctl_mutex); 1033 break; 1034 case SIOCADDDLCI: 1035 case SIOCDELDLCI: 1036 err = -ENOPKG; 1037 if (!dlci_ioctl_hook) 1038 request_module("dlci"); 1039 1040 mutex_lock(&dlci_ioctl_mutex); 1041 if (dlci_ioctl_hook) 1042 err = dlci_ioctl_hook(cmd, argp); 1043 mutex_unlock(&dlci_ioctl_mutex); 1044 break; 1045 case SIOCGSKNS: 1046 err = -EPERM; 1047 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1048 break; 1049 1050 err = open_related_ns(&net->ns, get_net_ns); 1051 break; 1052 default: 1053 err = sock_do_ioctl(net, sock, cmd, arg); 1054 break; 1055 } 1056 return err; 1057 } 1058 1059 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1060 { 1061 int err; 1062 struct socket *sock = NULL; 1063 1064 err = security_socket_create(family, type, protocol, 1); 1065 if (err) 1066 goto out; 1067 1068 sock = sock_alloc(); 1069 if (!sock) { 1070 err = -ENOMEM; 1071 goto out; 1072 } 1073 1074 sock->type = type; 1075 err = security_socket_post_create(sock, family, type, protocol, 1); 1076 if (err) 1077 goto out_release; 1078 1079 out: 1080 *res = sock; 1081 return err; 1082 out_release: 1083 sock_release(sock); 1084 sock = NULL; 1085 goto out; 1086 } 1087 EXPORT_SYMBOL(sock_create_lite); 1088 1089 /* No kernel lock held - perfect */ 1090 static unsigned int sock_poll(struct file *file, poll_table *wait) 1091 { 1092 unsigned int busy_flag = 0; 1093 struct socket *sock; 1094 1095 /* 1096 * We can't return errors to poll, so it's either yes or no. 1097 */ 1098 sock = file->private_data; 1099 1100 if (sk_can_busy_loop(sock->sk)) { 1101 /* this socket can poll_ll so tell the system call */ 1102 busy_flag = POLL_BUSY_LOOP; 1103 1104 /* once, only if requested by syscall */ 1105 if (wait && (wait->_key & POLL_BUSY_LOOP)) 1106 sk_busy_loop(sock->sk, 1); 1107 } 1108 1109 return busy_flag | sock->ops->poll(file, sock, wait); 1110 } 1111 1112 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1113 { 1114 struct socket *sock = file->private_data; 1115 1116 return sock->ops->mmap(file, sock, vma); 1117 } 1118 1119 static int sock_close(struct inode *inode, struct file *filp) 1120 { 1121 sock_release(SOCKET_I(inode)); 1122 return 0; 1123 } 1124 1125 /* 1126 * Update the socket async list 1127 * 1128 * Fasync_list locking strategy. 1129 * 1130 * 1. fasync_list is modified only under process context socket lock 1131 * i.e. under semaphore. 1132 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1133 * or under socket lock 1134 */ 1135 1136 static int sock_fasync(int fd, struct file *filp, int on) 1137 { 1138 struct socket *sock = filp->private_data; 1139 struct sock *sk = sock->sk; 1140 struct socket_wq *wq; 1141 1142 if (sk == NULL) 1143 return -EINVAL; 1144 1145 lock_sock(sk); 1146 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); 1147 fasync_helper(fd, filp, on, &wq->fasync_list); 1148 1149 if (!wq->fasync_list) 1150 sock_reset_flag(sk, SOCK_FASYNC); 1151 else 1152 sock_set_flag(sk, SOCK_FASYNC); 1153 1154 release_sock(sk); 1155 return 0; 1156 } 1157 1158 /* This function may be called only under rcu_lock */ 1159 1160 int sock_wake_async(struct socket_wq *wq, int how, int band) 1161 { 1162 if (!wq || !wq->fasync_list) 1163 return -1; 1164 1165 switch (how) { 1166 case SOCK_WAKE_WAITD: 1167 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1168 break; 1169 goto call_kill; 1170 case SOCK_WAKE_SPACE: 1171 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1172 break; 1173 /* fall through */ 1174 case SOCK_WAKE_IO: 1175 call_kill: 1176 kill_fasync(&wq->fasync_list, SIGIO, band); 1177 break; 1178 case SOCK_WAKE_URG: 1179 kill_fasync(&wq->fasync_list, SIGURG, band); 1180 } 1181 1182 return 0; 1183 } 1184 EXPORT_SYMBOL(sock_wake_async); 1185 1186 int __sock_create(struct net *net, int family, int type, int protocol, 1187 struct socket **res, int kern) 1188 { 1189 int err; 1190 struct socket *sock; 1191 const struct net_proto_family *pf; 1192 1193 /* 1194 * Check protocol is in range 1195 */ 1196 if (family < 0 || family >= NPROTO) 1197 return -EAFNOSUPPORT; 1198 if (type < 0 || type >= SOCK_MAX) 1199 return -EINVAL; 1200 1201 /* Compatibility. 1202 1203 This uglymoron is moved from INET layer to here to avoid 1204 deadlock in module load. 1205 */ 1206 if (family == PF_INET && type == SOCK_PACKET) { 1207 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1208 current->comm); 1209 family = PF_PACKET; 1210 } 1211 1212 err = security_socket_create(family, type, protocol, kern); 1213 if (err) 1214 return err; 1215 1216 /* 1217 * Allocate the socket and allow the family to set things up. if 1218 * the protocol is 0, the family is instructed to select an appropriate 1219 * default. 1220 */ 1221 sock = sock_alloc(); 1222 if (!sock) { 1223 net_warn_ratelimited("socket: no more sockets\n"); 1224 return -ENFILE; /* Not exactly a match, but its the 1225 closest posix thing */ 1226 } 1227 1228 sock->type = type; 1229 1230 #ifdef CONFIG_MODULES 1231 /* Attempt to load a protocol module if the find failed. 1232 * 1233 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1234 * requested real, full-featured networking support upon configuration. 1235 * Otherwise module support will break! 1236 */ 1237 if (rcu_access_pointer(net_families[family]) == NULL) 1238 request_module("net-pf-%d", family); 1239 #endif 1240 1241 rcu_read_lock(); 1242 pf = rcu_dereference(net_families[family]); 1243 err = -EAFNOSUPPORT; 1244 if (!pf) 1245 goto out_release; 1246 1247 /* 1248 * We will call the ->create function, that possibly is in a loadable 1249 * module, so we have to bump that loadable module refcnt first. 1250 */ 1251 if (!try_module_get(pf->owner)) 1252 goto out_release; 1253 1254 /* Now protected by module ref count */ 1255 rcu_read_unlock(); 1256 1257 err = pf->create(net, sock, protocol, kern); 1258 if (err < 0) 1259 goto out_module_put; 1260 1261 /* 1262 * Now to bump the refcnt of the [loadable] module that owns this 1263 * socket at sock_release time we decrement its refcnt. 1264 */ 1265 if (!try_module_get(sock->ops->owner)) 1266 goto out_module_busy; 1267 1268 /* 1269 * Now that we're done with the ->create function, the [loadable] 1270 * module can have its refcnt decremented 1271 */ 1272 module_put(pf->owner); 1273 err = security_socket_post_create(sock, family, type, protocol, kern); 1274 if (err) 1275 goto out_sock_release; 1276 *res = sock; 1277 1278 return 0; 1279 1280 out_module_busy: 1281 err = -EAFNOSUPPORT; 1282 out_module_put: 1283 sock->ops = NULL; 1284 module_put(pf->owner); 1285 out_sock_release: 1286 sock_release(sock); 1287 return err; 1288 1289 out_release: 1290 rcu_read_unlock(); 1291 goto out_sock_release; 1292 } 1293 EXPORT_SYMBOL(__sock_create); 1294 1295 int sock_create(int family, int type, int protocol, struct socket **res) 1296 { 1297 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1298 } 1299 EXPORT_SYMBOL(sock_create); 1300 1301 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1302 { 1303 return __sock_create(net, family, type, protocol, res, 1); 1304 } 1305 EXPORT_SYMBOL(sock_create_kern); 1306 1307 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1308 { 1309 int retval; 1310 struct socket *sock; 1311 int flags; 1312 1313 /* Check the SOCK_* constants for consistency. */ 1314 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1315 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1316 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1317 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1318 1319 flags = type & ~SOCK_TYPE_MASK; 1320 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1321 return -EINVAL; 1322 type &= SOCK_TYPE_MASK; 1323 1324 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1325 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1326 1327 retval = sock_create(family, type, protocol, &sock); 1328 if (retval < 0) 1329 return retval; 1330 1331 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1332 } 1333 1334 /* 1335 * Create a pair of connected sockets. 1336 */ 1337 1338 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1339 int __user *, usockvec) 1340 { 1341 struct socket *sock1, *sock2; 1342 int fd1, fd2, err; 1343 struct file *newfile1, *newfile2; 1344 int flags; 1345 1346 flags = type & ~SOCK_TYPE_MASK; 1347 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1348 return -EINVAL; 1349 type &= SOCK_TYPE_MASK; 1350 1351 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1352 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1353 1354 /* 1355 * reserve descriptors and make sure we won't fail 1356 * to return them to userland. 1357 */ 1358 fd1 = get_unused_fd_flags(flags); 1359 if (unlikely(fd1 < 0)) 1360 return fd1; 1361 1362 fd2 = get_unused_fd_flags(flags); 1363 if (unlikely(fd2 < 0)) { 1364 put_unused_fd(fd1); 1365 return fd2; 1366 } 1367 1368 err = put_user(fd1, &usockvec[0]); 1369 if (err) 1370 goto out; 1371 1372 err = put_user(fd2, &usockvec[1]); 1373 if (err) 1374 goto out; 1375 1376 /* 1377 * Obtain the first socket and check if the underlying protocol 1378 * supports the socketpair call. 1379 */ 1380 1381 err = sock_create(family, type, protocol, &sock1); 1382 if (unlikely(err < 0)) 1383 goto out; 1384 1385 err = sock_create(family, type, protocol, &sock2); 1386 if (unlikely(err < 0)) { 1387 sock_release(sock1); 1388 goto out; 1389 } 1390 1391 err = sock1->ops->socketpair(sock1, sock2); 1392 if (unlikely(err < 0)) { 1393 sock_release(sock2); 1394 sock_release(sock1); 1395 goto out; 1396 } 1397 1398 newfile1 = sock_alloc_file(sock1, flags, NULL); 1399 if (IS_ERR(newfile1)) { 1400 err = PTR_ERR(newfile1); 1401 sock_release(sock2); 1402 goto out; 1403 } 1404 1405 newfile2 = sock_alloc_file(sock2, flags, NULL); 1406 if (IS_ERR(newfile2)) { 1407 err = PTR_ERR(newfile2); 1408 fput(newfile1); 1409 goto out; 1410 } 1411 1412 audit_fd_pair(fd1, fd2); 1413 1414 fd_install(fd1, newfile1); 1415 fd_install(fd2, newfile2); 1416 return 0; 1417 1418 out: 1419 put_unused_fd(fd2); 1420 put_unused_fd(fd1); 1421 return err; 1422 } 1423 1424 /* 1425 * Bind a name to a socket. Nothing much to do here since it's 1426 * the protocol's responsibility to handle the local address. 1427 * 1428 * We move the socket address to kernel space before we call 1429 * the protocol layer (having also checked the address is ok). 1430 */ 1431 1432 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1433 { 1434 struct socket *sock; 1435 struct sockaddr_storage address; 1436 int err, fput_needed; 1437 1438 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1439 if (sock) { 1440 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1441 if (err >= 0) { 1442 err = security_socket_bind(sock, 1443 (struct sockaddr *)&address, 1444 addrlen); 1445 if (!err) 1446 err = sock->ops->bind(sock, 1447 (struct sockaddr *) 1448 &address, addrlen); 1449 } 1450 fput_light(sock->file, fput_needed); 1451 } 1452 return err; 1453 } 1454 1455 /* 1456 * Perform a listen. Basically, we allow the protocol to do anything 1457 * necessary for a listen, and if that works, we mark the socket as 1458 * ready for listening. 1459 */ 1460 1461 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1462 { 1463 struct socket *sock; 1464 int err, fput_needed; 1465 int somaxconn; 1466 1467 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1468 if (sock) { 1469 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1470 if ((unsigned int)backlog > somaxconn) 1471 backlog = somaxconn; 1472 1473 err = security_socket_listen(sock, backlog); 1474 if (!err) 1475 err = sock->ops->listen(sock, backlog); 1476 1477 fput_light(sock->file, fput_needed); 1478 } 1479 return err; 1480 } 1481 1482 /* 1483 * For accept, we attempt to create a new socket, set up the link 1484 * with the client, wake up the client, then return the new 1485 * connected fd. We collect the address of the connector in kernel 1486 * space and move it to user at the very end. This is unclean because 1487 * we open the socket then return an error. 1488 * 1489 * 1003.1g adds the ability to recvmsg() to query connection pending 1490 * status to recvmsg. We need to add that support in a way thats 1491 * clean when we restucture accept also. 1492 */ 1493 1494 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1495 int __user *, upeer_addrlen, int, flags) 1496 { 1497 struct socket *sock, *newsock; 1498 struct file *newfile; 1499 int err, len, newfd, fput_needed; 1500 struct sockaddr_storage address; 1501 1502 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1503 return -EINVAL; 1504 1505 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1506 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1507 1508 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1509 if (!sock) 1510 goto out; 1511 1512 err = -ENFILE; 1513 newsock = sock_alloc(); 1514 if (!newsock) 1515 goto out_put; 1516 1517 newsock->type = sock->type; 1518 newsock->ops = sock->ops; 1519 1520 /* 1521 * We don't need try_module_get here, as the listening socket (sock) 1522 * has the protocol module (sock->ops->owner) held. 1523 */ 1524 __module_get(newsock->ops->owner); 1525 1526 newfd = get_unused_fd_flags(flags); 1527 if (unlikely(newfd < 0)) { 1528 err = newfd; 1529 sock_release(newsock); 1530 goto out_put; 1531 } 1532 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1533 if (IS_ERR(newfile)) { 1534 err = PTR_ERR(newfile); 1535 put_unused_fd(newfd); 1536 goto out_put; 1537 } 1538 1539 err = security_socket_accept(sock, newsock); 1540 if (err) 1541 goto out_fd; 1542 1543 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 1544 if (err < 0) 1545 goto out_fd; 1546 1547 if (upeer_sockaddr) { 1548 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1549 &len, 2) < 0) { 1550 err = -ECONNABORTED; 1551 goto out_fd; 1552 } 1553 err = move_addr_to_user(&address, 1554 len, upeer_sockaddr, upeer_addrlen); 1555 if (err < 0) 1556 goto out_fd; 1557 } 1558 1559 /* File flags are not inherited via accept() unlike another OSes. */ 1560 1561 fd_install(newfd, newfile); 1562 err = newfd; 1563 1564 out_put: 1565 fput_light(sock->file, fput_needed); 1566 out: 1567 return err; 1568 out_fd: 1569 fput(newfile); 1570 put_unused_fd(newfd); 1571 goto out_put; 1572 } 1573 1574 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1575 int __user *, upeer_addrlen) 1576 { 1577 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1578 } 1579 1580 /* 1581 * Attempt to connect to a socket with the server address. The address 1582 * is in user space so we verify it is OK and move it to kernel space. 1583 * 1584 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1585 * break bindings 1586 * 1587 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1588 * other SEQPACKET protocols that take time to connect() as it doesn't 1589 * include the -EINPROGRESS status for such sockets. 1590 */ 1591 1592 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1593 int, addrlen) 1594 { 1595 struct socket *sock; 1596 struct sockaddr_storage address; 1597 int err, fput_needed; 1598 1599 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1600 if (!sock) 1601 goto out; 1602 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1603 if (err < 0) 1604 goto out_put; 1605 1606 err = 1607 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1608 if (err) 1609 goto out_put; 1610 1611 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1612 sock->file->f_flags); 1613 out_put: 1614 fput_light(sock->file, fput_needed); 1615 out: 1616 return err; 1617 } 1618 1619 /* 1620 * Get the local address ('name') of a socket object. Move the obtained 1621 * name to user space. 1622 */ 1623 1624 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1625 int __user *, usockaddr_len) 1626 { 1627 struct socket *sock; 1628 struct sockaddr_storage address; 1629 int len, err, fput_needed; 1630 1631 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1632 if (!sock) 1633 goto out; 1634 1635 err = security_socket_getsockname(sock); 1636 if (err) 1637 goto out_put; 1638 1639 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1640 if (err) 1641 goto out_put; 1642 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 1643 1644 out_put: 1645 fput_light(sock->file, fput_needed); 1646 out: 1647 return err; 1648 } 1649 1650 /* 1651 * Get the remote address ('name') of a socket object. Move the obtained 1652 * name to user space. 1653 */ 1654 1655 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1656 int __user *, usockaddr_len) 1657 { 1658 struct socket *sock; 1659 struct sockaddr_storage address; 1660 int len, err, fput_needed; 1661 1662 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1663 if (sock != NULL) { 1664 err = security_socket_getpeername(sock); 1665 if (err) { 1666 fput_light(sock->file, fput_needed); 1667 return err; 1668 } 1669 1670 err = 1671 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1672 1); 1673 if (!err) 1674 err = move_addr_to_user(&address, len, usockaddr, 1675 usockaddr_len); 1676 fput_light(sock->file, fput_needed); 1677 } 1678 return err; 1679 } 1680 1681 /* 1682 * Send a datagram to a given address. We move the address into kernel 1683 * space and check the user space data area is readable before invoking 1684 * the protocol. 1685 */ 1686 1687 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1688 unsigned int, flags, struct sockaddr __user *, addr, 1689 int, addr_len) 1690 { 1691 struct socket *sock; 1692 struct sockaddr_storage address; 1693 int err; 1694 struct msghdr msg; 1695 struct iovec iov; 1696 int fput_needed; 1697 1698 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1699 if (unlikely(err)) 1700 return err; 1701 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1702 if (!sock) 1703 goto out; 1704 1705 msg.msg_name = NULL; 1706 msg.msg_control = NULL; 1707 msg.msg_controllen = 0; 1708 msg.msg_namelen = 0; 1709 if (addr) { 1710 err = move_addr_to_kernel(addr, addr_len, &address); 1711 if (err < 0) 1712 goto out_put; 1713 msg.msg_name = (struct sockaddr *)&address; 1714 msg.msg_namelen = addr_len; 1715 } 1716 if (sock->file->f_flags & O_NONBLOCK) 1717 flags |= MSG_DONTWAIT; 1718 msg.msg_flags = flags; 1719 err = sock_sendmsg(sock, &msg); 1720 1721 out_put: 1722 fput_light(sock->file, fput_needed); 1723 out: 1724 return err; 1725 } 1726 1727 /* 1728 * Send a datagram down a socket. 1729 */ 1730 1731 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1732 unsigned int, flags) 1733 { 1734 return sys_sendto(fd, buff, len, flags, NULL, 0); 1735 } 1736 1737 /* 1738 * Receive a frame from the socket and optionally record the address of the 1739 * sender. We verify the buffers are writable and if needed move the 1740 * sender address from kernel to user space. 1741 */ 1742 1743 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1744 unsigned int, flags, struct sockaddr __user *, addr, 1745 int __user *, addr_len) 1746 { 1747 struct socket *sock; 1748 struct iovec iov; 1749 struct msghdr msg; 1750 struct sockaddr_storage address; 1751 int err, err2; 1752 int fput_needed; 1753 1754 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1755 if (unlikely(err)) 1756 return err; 1757 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1758 if (!sock) 1759 goto out; 1760 1761 msg.msg_control = NULL; 1762 msg.msg_controllen = 0; 1763 /* Save some cycles and don't copy the address if not needed */ 1764 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1765 /* We assume all kernel code knows the size of sockaddr_storage */ 1766 msg.msg_namelen = 0; 1767 msg.msg_iocb = NULL; 1768 msg.msg_flags = 0; 1769 if (sock->file->f_flags & O_NONBLOCK) 1770 flags |= MSG_DONTWAIT; 1771 err = sock_recvmsg(sock, &msg, flags); 1772 1773 if (err >= 0 && addr != NULL) { 1774 err2 = move_addr_to_user(&address, 1775 msg.msg_namelen, addr, addr_len); 1776 if (err2 < 0) 1777 err = err2; 1778 } 1779 1780 fput_light(sock->file, fput_needed); 1781 out: 1782 return err; 1783 } 1784 1785 /* 1786 * Receive a datagram from a socket. 1787 */ 1788 1789 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1790 unsigned int, flags) 1791 { 1792 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1793 } 1794 1795 /* 1796 * Set a socket option. Because we don't know the option lengths we have 1797 * to pass the user mode parameter for the protocols to sort out. 1798 */ 1799 1800 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1801 char __user *, optval, int, optlen) 1802 { 1803 int err, fput_needed; 1804 struct socket *sock; 1805 1806 if (optlen < 0) 1807 return -EINVAL; 1808 1809 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1810 if (sock != NULL) { 1811 err = security_socket_setsockopt(sock, level, optname); 1812 if (err) 1813 goto out_put; 1814 1815 if (level == SOL_SOCKET) 1816 err = 1817 sock_setsockopt(sock, level, optname, optval, 1818 optlen); 1819 else 1820 err = 1821 sock->ops->setsockopt(sock, level, optname, optval, 1822 optlen); 1823 out_put: 1824 fput_light(sock->file, fput_needed); 1825 } 1826 return err; 1827 } 1828 1829 /* 1830 * Get a socket option. Because we don't know the option lengths we have 1831 * to pass a user mode parameter for the protocols to sort out. 1832 */ 1833 1834 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1835 char __user *, optval, int __user *, optlen) 1836 { 1837 int err, fput_needed; 1838 struct socket *sock; 1839 1840 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1841 if (sock != NULL) { 1842 err = security_socket_getsockopt(sock, level, optname); 1843 if (err) 1844 goto out_put; 1845 1846 if (level == SOL_SOCKET) 1847 err = 1848 sock_getsockopt(sock, level, optname, optval, 1849 optlen); 1850 else 1851 err = 1852 sock->ops->getsockopt(sock, level, optname, optval, 1853 optlen); 1854 out_put: 1855 fput_light(sock->file, fput_needed); 1856 } 1857 return err; 1858 } 1859 1860 /* 1861 * Shutdown a socket. 1862 */ 1863 1864 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1865 { 1866 int err, fput_needed; 1867 struct socket *sock; 1868 1869 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1870 if (sock != NULL) { 1871 err = security_socket_shutdown(sock, how); 1872 if (!err) 1873 err = sock->ops->shutdown(sock, how); 1874 fput_light(sock->file, fput_needed); 1875 } 1876 return err; 1877 } 1878 1879 /* A couple of helpful macros for getting the address of the 32/64 bit 1880 * fields which are the same type (int / unsigned) on our platforms. 1881 */ 1882 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1883 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1884 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1885 1886 struct used_address { 1887 struct sockaddr_storage name; 1888 unsigned int name_len; 1889 }; 1890 1891 static int copy_msghdr_from_user(struct msghdr *kmsg, 1892 struct user_msghdr __user *umsg, 1893 struct sockaddr __user **save_addr, 1894 struct iovec **iov) 1895 { 1896 struct user_msghdr msg; 1897 ssize_t err; 1898 1899 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 1900 return -EFAULT; 1901 1902 kmsg->msg_control = (void __force *)msg.msg_control; 1903 kmsg->msg_controllen = msg.msg_controllen; 1904 kmsg->msg_flags = msg.msg_flags; 1905 1906 kmsg->msg_namelen = msg.msg_namelen; 1907 if (!msg.msg_name) 1908 kmsg->msg_namelen = 0; 1909 1910 if (kmsg->msg_namelen < 0) 1911 return -EINVAL; 1912 1913 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 1914 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 1915 1916 if (save_addr) 1917 *save_addr = msg.msg_name; 1918 1919 if (msg.msg_name && kmsg->msg_namelen) { 1920 if (!save_addr) { 1921 err = move_addr_to_kernel(msg.msg_name, 1922 kmsg->msg_namelen, 1923 kmsg->msg_name); 1924 if (err < 0) 1925 return err; 1926 } 1927 } else { 1928 kmsg->msg_name = NULL; 1929 kmsg->msg_namelen = 0; 1930 } 1931 1932 if (msg.msg_iovlen > UIO_MAXIOV) 1933 return -EMSGSIZE; 1934 1935 kmsg->msg_iocb = NULL; 1936 1937 return import_iovec(save_addr ? READ : WRITE, 1938 msg.msg_iov, msg.msg_iovlen, 1939 UIO_FASTIOV, iov, &kmsg->msg_iter); 1940 } 1941 1942 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 1943 struct msghdr *msg_sys, unsigned int flags, 1944 struct used_address *used_address, 1945 unsigned int allowed_msghdr_flags) 1946 { 1947 struct compat_msghdr __user *msg_compat = 1948 (struct compat_msghdr __user *)msg; 1949 struct sockaddr_storage address; 1950 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1951 unsigned char ctl[sizeof(struct cmsghdr) + 20] 1952 __aligned(sizeof(__kernel_size_t)); 1953 /* 20 is size of ipv6_pktinfo */ 1954 unsigned char *ctl_buf = ctl; 1955 int ctl_len; 1956 ssize_t err; 1957 1958 msg_sys->msg_name = &address; 1959 1960 if (MSG_CMSG_COMPAT & flags) 1961 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 1962 else 1963 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 1964 if (err < 0) 1965 return err; 1966 1967 err = -ENOBUFS; 1968 1969 if (msg_sys->msg_controllen > INT_MAX) 1970 goto out_freeiov; 1971 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 1972 ctl_len = msg_sys->msg_controllen; 1973 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 1974 err = 1975 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 1976 sizeof(ctl)); 1977 if (err) 1978 goto out_freeiov; 1979 ctl_buf = msg_sys->msg_control; 1980 ctl_len = msg_sys->msg_controllen; 1981 } else if (ctl_len) { 1982 BUILD_BUG_ON(sizeof(struct cmsghdr) != 1983 CMSG_ALIGN(sizeof(struct cmsghdr))); 1984 if (ctl_len > sizeof(ctl)) { 1985 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 1986 if (ctl_buf == NULL) 1987 goto out_freeiov; 1988 } 1989 err = -EFAULT; 1990 /* 1991 * Careful! Before this, msg_sys->msg_control contains a user pointer. 1992 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 1993 * checking falls down on this. 1994 */ 1995 if (copy_from_user(ctl_buf, 1996 (void __user __force *)msg_sys->msg_control, 1997 ctl_len)) 1998 goto out_freectl; 1999 msg_sys->msg_control = ctl_buf; 2000 } 2001 msg_sys->msg_flags = flags; 2002 2003 if (sock->file->f_flags & O_NONBLOCK) 2004 msg_sys->msg_flags |= MSG_DONTWAIT; 2005 /* 2006 * If this is sendmmsg() and current destination address is same as 2007 * previously succeeded address, omit asking LSM's decision. 2008 * used_address->name_len is initialized to UINT_MAX so that the first 2009 * destination address never matches. 2010 */ 2011 if (used_address && msg_sys->msg_name && 2012 used_address->name_len == msg_sys->msg_namelen && 2013 !memcmp(&used_address->name, msg_sys->msg_name, 2014 used_address->name_len)) { 2015 err = sock_sendmsg_nosec(sock, msg_sys); 2016 goto out_freectl; 2017 } 2018 err = sock_sendmsg(sock, msg_sys); 2019 /* 2020 * If this is sendmmsg() and sending to current destination address was 2021 * successful, remember it. 2022 */ 2023 if (used_address && err >= 0) { 2024 used_address->name_len = msg_sys->msg_namelen; 2025 if (msg_sys->msg_name) 2026 memcpy(&used_address->name, msg_sys->msg_name, 2027 used_address->name_len); 2028 } 2029 2030 out_freectl: 2031 if (ctl_buf != ctl) 2032 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2033 out_freeiov: 2034 kfree(iov); 2035 return err; 2036 } 2037 2038 /* 2039 * BSD sendmsg interface 2040 */ 2041 2042 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2043 { 2044 int fput_needed, err; 2045 struct msghdr msg_sys; 2046 struct socket *sock; 2047 2048 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2049 if (!sock) 2050 goto out; 2051 2052 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2053 2054 fput_light(sock->file, fput_needed); 2055 out: 2056 return err; 2057 } 2058 2059 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2060 { 2061 if (flags & MSG_CMSG_COMPAT) 2062 return -EINVAL; 2063 return __sys_sendmsg(fd, msg, flags); 2064 } 2065 2066 /* 2067 * Linux sendmmsg interface 2068 */ 2069 2070 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2071 unsigned int flags) 2072 { 2073 int fput_needed, err, datagrams; 2074 struct socket *sock; 2075 struct mmsghdr __user *entry; 2076 struct compat_mmsghdr __user *compat_entry; 2077 struct msghdr msg_sys; 2078 struct used_address used_address; 2079 unsigned int oflags = flags; 2080 2081 if (vlen > UIO_MAXIOV) 2082 vlen = UIO_MAXIOV; 2083 2084 datagrams = 0; 2085 2086 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2087 if (!sock) 2088 return err; 2089 2090 used_address.name_len = UINT_MAX; 2091 entry = mmsg; 2092 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2093 err = 0; 2094 flags |= MSG_BATCH; 2095 2096 while (datagrams < vlen) { 2097 if (datagrams == vlen - 1) 2098 flags = oflags; 2099 2100 if (MSG_CMSG_COMPAT & flags) { 2101 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2102 &msg_sys, flags, &used_address, MSG_EOR); 2103 if (err < 0) 2104 break; 2105 err = __put_user(err, &compat_entry->msg_len); 2106 ++compat_entry; 2107 } else { 2108 err = ___sys_sendmsg(sock, 2109 (struct user_msghdr __user *)entry, 2110 &msg_sys, flags, &used_address, MSG_EOR); 2111 if (err < 0) 2112 break; 2113 err = put_user(err, &entry->msg_len); 2114 ++entry; 2115 } 2116 2117 if (err) 2118 break; 2119 ++datagrams; 2120 if (msg_data_left(&msg_sys)) 2121 break; 2122 cond_resched(); 2123 } 2124 2125 fput_light(sock->file, fput_needed); 2126 2127 /* We only return an error if no datagrams were able to be sent */ 2128 if (datagrams != 0) 2129 return datagrams; 2130 2131 return err; 2132 } 2133 2134 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2135 unsigned int, vlen, unsigned int, flags) 2136 { 2137 if (flags & MSG_CMSG_COMPAT) 2138 return -EINVAL; 2139 return __sys_sendmmsg(fd, mmsg, vlen, flags); 2140 } 2141 2142 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2143 struct msghdr *msg_sys, unsigned int flags, int nosec) 2144 { 2145 struct compat_msghdr __user *msg_compat = 2146 (struct compat_msghdr __user *)msg; 2147 struct iovec iovstack[UIO_FASTIOV]; 2148 struct iovec *iov = iovstack; 2149 unsigned long cmsg_ptr; 2150 int len; 2151 ssize_t err; 2152 2153 /* kernel mode address */ 2154 struct sockaddr_storage addr; 2155 2156 /* user mode address pointers */ 2157 struct sockaddr __user *uaddr; 2158 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2159 2160 msg_sys->msg_name = &addr; 2161 2162 if (MSG_CMSG_COMPAT & flags) 2163 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2164 else 2165 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 2166 if (err < 0) 2167 return err; 2168 2169 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2170 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2171 2172 /* We assume all kernel code knows the size of sockaddr_storage */ 2173 msg_sys->msg_namelen = 0; 2174 2175 if (sock->file->f_flags & O_NONBLOCK) 2176 flags |= MSG_DONTWAIT; 2177 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 2178 if (err < 0) 2179 goto out_freeiov; 2180 len = err; 2181 2182 if (uaddr != NULL) { 2183 err = move_addr_to_user(&addr, 2184 msg_sys->msg_namelen, uaddr, 2185 uaddr_len); 2186 if (err < 0) 2187 goto out_freeiov; 2188 } 2189 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2190 COMPAT_FLAGS(msg)); 2191 if (err) 2192 goto out_freeiov; 2193 if (MSG_CMSG_COMPAT & flags) 2194 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2195 &msg_compat->msg_controllen); 2196 else 2197 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2198 &msg->msg_controllen); 2199 if (err) 2200 goto out_freeiov; 2201 err = len; 2202 2203 out_freeiov: 2204 kfree(iov); 2205 return err; 2206 } 2207 2208 /* 2209 * BSD recvmsg interface 2210 */ 2211 2212 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2213 { 2214 int fput_needed, err; 2215 struct msghdr msg_sys; 2216 struct socket *sock; 2217 2218 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2219 if (!sock) 2220 goto out; 2221 2222 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2223 2224 fput_light(sock->file, fput_needed); 2225 out: 2226 return err; 2227 } 2228 2229 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2230 unsigned int, flags) 2231 { 2232 if (flags & MSG_CMSG_COMPAT) 2233 return -EINVAL; 2234 return __sys_recvmsg(fd, msg, flags); 2235 } 2236 2237 /* 2238 * Linux recvmmsg interface 2239 */ 2240 2241 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2242 unsigned int flags, struct timespec *timeout) 2243 { 2244 int fput_needed, err, datagrams; 2245 struct socket *sock; 2246 struct mmsghdr __user *entry; 2247 struct compat_mmsghdr __user *compat_entry; 2248 struct msghdr msg_sys; 2249 struct timespec64 end_time; 2250 struct timespec64 timeout64; 2251 2252 if (timeout && 2253 poll_select_set_timeout(&end_time, timeout->tv_sec, 2254 timeout->tv_nsec)) 2255 return -EINVAL; 2256 2257 datagrams = 0; 2258 2259 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2260 if (!sock) 2261 return err; 2262 2263 err = sock_error(sock->sk); 2264 if (err) { 2265 datagrams = err; 2266 goto out_put; 2267 } 2268 2269 entry = mmsg; 2270 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2271 2272 while (datagrams < vlen) { 2273 /* 2274 * No need to ask LSM for more than the first datagram. 2275 */ 2276 if (MSG_CMSG_COMPAT & flags) { 2277 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2278 &msg_sys, flags & ~MSG_WAITFORONE, 2279 datagrams); 2280 if (err < 0) 2281 break; 2282 err = __put_user(err, &compat_entry->msg_len); 2283 ++compat_entry; 2284 } else { 2285 err = ___sys_recvmsg(sock, 2286 (struct user_msghdr __user *)entry, 2287 &msg_sys, flags & ~MSG_WAITFORONE, 2288 datagrams); 2289 if (err < 0) 2290 break; 2291 err = put_user(err, &entry->msg_len); 2292 ++entry; 2293 } 2294 2295 if (err) 2296 break; 2297 ++datagrams; 2298 2299 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2300 if (flags & MSG_WAITFORONE) 2301 flags |= MSG_DONTWAIT; 2302 2303 if (timeout) { 2304 ktime_get_ts64(&timeout64); 2305 *timeout = timespec64_to_timespec( 2306 timespec64_sub(end_time, timeout64)); 2307 if (timeout->tv_sec < 0) { 2308 timeout->tv_sec = timeout->tv_nsec = 0; 2309 break; 2310 } 2311 2312 /* Timeout, return less than vlen datagrams */ 2313 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2314 break; 2315 } 2316 2317 /* Out of band data, return right away */ 2318 if (msg_sys.msg_flags & MSG_OOB) 2319 break; 2320 cond_resched(); 2321 } 2322 2323 if (err == 0) 2324 goto out_put; 2325 2326 if (datagrams == 0) { 2327 datagrams = err; 2328 goto out_put; 2329 } 2330 2331 /* 2332 * We may return less entries than requested (vlen) if the 2333 * sock is non block and there aren't enough datagrams... 2334 */ 2335 if (err != -EAGAIN) { 2336 /* 2337 * ... or if recvmsg returns an error after we 2338 * received some datagrams, where we record the 2339 * error to return on the next call or if the 2340 * app asks about it using getsockopt(SO_ERROR). 2341 */ 2342 sock->sk->sk_err = -err; 2343 } 2344 out_put: 2345 fput_light(sock->file, fput_needed); 2346 2347 return datagrams; 2348 } 2349 2350 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2351 unsigned int, vlen, unsigned int, flags, 2352 struct timespec __user *, timeout) 2353 { 2354 int datagrams; 2355 struct timespec timeout_sys; 2356 2357 if (flags & MSG_CMSG_COMPAT) 2358 return -EINVAL; 2359 2360 if (!timeout) 2361 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2362 2363 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2364 return -EFAULT; 2365 2366 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2367 2368 if (datagrams > 0 && 2369 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2370 datagrams = -EFAULT; 2371 2372 return datagrams; 2373 } 2374 2375 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2376 /* Argument list sizes for sys_socketcall */ 2377 #define AL(x) ((x) * sizeof(unsigned long)) 2378 static const unsigned char nargs[21] = { 2379 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2380 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2381 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2382 AL(4), AL(5), AL(4) 2383 }; 2384 2385 #undef AL 2386 2387 /* 2388 * System call vectors. 2389 * 2390 * Argument checking cleaned up. Saved 20% in size. 2391 * This function doesn't need to set the kernel lock because 2392 * it is set by the callees. 2393 */ 2394 2395 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2396 { 2397 unsigned long a[AUDITSC_ARGS]; 2398 unsigned long a0, a1; 2399 int err; 2400 unsigned int len; 2401 2402 if (call < 1 || call > SYS_SENDMMSG) 2403 return -EINVAL; 2404 2405 len = nargs[call]; 2406 if (len > sizeof(a)) 2407 return -EINVAL; 2408 2409 /* copy_from_user should be SMP safe. */ 2410 if (copy_from_user(a, args, len)) 2411 return -EFAULT; 2412 2413 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2414 if (err) 2415 return err; 2416 2417 a0 = a[0]; 2418 a1 = a[1]; 2419 2420 switch (call) { 2421 case SYS_SOCKET: 2422 err = sys_socket(a0, a1, a[2]); 2423 break; 2424 case SYS_BIND: 2425 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2426 break; 2427 case SYS_CONNECT: 2428 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2429 break; 2430 case SYS_LISTEN: 2431 err = sys_listen(a0, a1); 2432 break; 2433 case SYS_ACCEPT: 2434 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2435 (int __user *)a[2], 0); 2436 break; 2437 case SYS_GETSOCKNAME: 2438 err = 2439 sys_getsockname(a0, (struct sockaddr __user *)a1, 2440 (int __user *)a[2]); 2441 break; 2442 case SYS_GETPEERNAME: 2443 err = 2444 sys_getpeername(a0, (struct sockaddr __user *)a1, 2445 (int __user *)a[2]); 2446 break; 2447 case SYS_SOCKETPAIR: 2448 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2449 break; 2450 case SYS_SEND: 2451 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2452 break; 2453 case SYS_SENDTO: 2454 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2455 (struct sockaddr __user *)a[4], a[5]); 2456 break; 2457 case SYS_RECV: 2458 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2459 break; 2460 case SYS_RECVFROM: 2461 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2462 (struct sockaddr __user *)a[4], 2463 (int __user *)a[5]); 2464 break; 2465 case SYS_SHUTDOWN: 2466 err = sys_shutdown(a0, a1); 2467 break; 2468 case SYS_SETSOCKOPT: 2469 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2470 break; 2471 case SYS_GETSOCKOPT: 2472 err = 2473 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2474 (int __user *)a[4]); 2475 break; 2476 case SYS_SENDMSG: 2477 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2478 break; 2479 case SYS_SENDMMSG: 2480 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2481 break; 2482 case SYS_RECVMSG: 2483 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2484 break; 2485 case SYS_RECVMMSG: 2486 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2487 (struct timespec __user *)a[4]); 2488 break; 2489 case SYS_ACCEPT4: 2490 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2491 (int __user *)a[2], a[3]); 2492 break; 2493 default: 2494 err = -EINVAL; 2495 break; 2496 } 2497 return err; 2498 } 2499 2500 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2501 2502 /** 2503 * sock_register - add a socket protocol handler 2504 * @ops: description of protocol 2505 * 2506 * This function is called by a protocol handler that wants to 2507 * advertise its address family, and have it linked into the 2508 * socket interface. The value ops->family corresponds to the 2509 * socket system call protocol family. 2510 */ 2511 int sock_register(const struct net_proto_family *ops) 2512 { 2513 int err; 2514 2515 if (ops->family >= NPROTO) { 2516 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2517 return -ENOBUFS; 2518 } 2519 2520 spin_lock(&net_family_lock); 2521 if (rcu_dereference_protected(net_families[ops->family], 2522 lockdep_is_held(&net_family_lock))) 2523 err = -EEXIST; 2524 else { 2525 rcu_assign_pointer(net_families[ops->family], ops); 2526 err = 0; 2527 } 2528 spin_unlock(&net_family_lock); 2529 2530 pr_info("NET: Registered protocol family %d\n", ops->family); 2531 return err; 2532 } 2533 EXPORT_SYMBOL(sock_register); 2534 2535 /** 2536 * sock_unregister - remove a protocol handler 2537 * @family: protocol family to remove 2538 * 2539 * This function is called by a protocol handler that wants to 2540 * remove its address family, and have it unlinked from the 2541 * new socket creation. 2542 * 2543 * If protocol handler is a module, then it can use module reference 2544 * counts to protect against new references. If protocol handler is not 2545 * a module then it needs to provide its own protection in 2546 * the ops->create routine. 2547 */ 2548 void sock_unregister(int family) 2549 { 2550 BUG_ON(family < 0 || family >= NPROTO); 2551 2552 spin_lock(&net_family_lock); 2553 RCU_INIT_POINTER(net_families[family], NULL); 2554 spin_unlock(&net_family_lock); 2555 2556 synchronize_rcu(); 2557 2558 pr_info("NET: Unregistered protocol family %d\n", family); 2559 } 2560 EXPORT_SYMBOL(sock_unregister); 2561 2562 static int __init sock_init(void) 2563 { 2564 int err; 2565 /* 2566 * Initialize the network sysctl infrastructure. 2567 */ 2568 err = net_sysctl_init(); 2569 if (err) 2570 goto out; 2571 2572 /* 2573 * Initialize skbuff SLAB cache 2574 */ 2575 skb_init(); 2576 2577 /* 2578 * Initialize the protocols module. 2579 */ 2580 2581 init_inodecache(); 2582 2583 err = register_filesystem(&sock_fs_type); 2584 if (err) 2585 goto out_fs; 2586 sock_mnt = kern_mount(&sock_fs_type); 2587 if (IS_ERR(sock_mnt)) { 2588 err = PTR_ERR(sock_mnt); 2589 goto out_mount; 2590 } 2591 2592 /* The real protocol initialization is performed in later initcalls. 2593 */ 2594 2595 #ifdef CONFIG_NETFILTER 2596 err = netfilter_init(); 2597 if (err) 2598 goto out; 2599 #endif 2600 2601 ptp_classifier_init(); 2602 2603 out: 2604 return err; 2605 2606 out_mount: 2607 unregister_filesystem(&sock_fs_type); 2608 out_fs: 2609 goto out; 2610 } 2611 2612 core_initcall(sock_init); /* early initcall */ 2613 2614 #ifdef CONFIG_PROC_FS 2615 void socket_seq_show(struct seq_file *seq) 2616 { 2617 seq_printf(seq, "sockets: used %d\n", 2618 sock_inuse_get(seq->private)); 2619 } 2620 #endif /* CONFIG_PROC_FS */ 2621 2622 #ifdef CONFIG_COMPAT 2623 static int do_siocgstamp(struct net *net, struct socket *sock, 2624 unsigned int cmd, void __user *up) 2625 { 2626 mm_segment_t old_fs = get_fs(); 2627 struct timeval ktv; 2628 int err; 2629 2630 set_fs(KERNEL_DS); 2631 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2632 set_fs(old_fs); 2633 if (!err) 2634 err = compat_put_timeval(&ktv, up); 2635 2636 return err; 2637 } 2638 2639 static int do_siocgstampns(struct net *net, struct socket *sock, 2640 unsigned int cmd, void __user *up) 2641 { 2642 mm_segment_t old_fs = get_fs(); 2643 struct timespec kts; 2644 int err; 2645 2646 set_fs(KERNEL_DS); 2647 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2648 set_fs(old_fs); 2649 if (!err) 2650 err = compat_put_timespec(&kts, up); 2651 2652 return err; 2653 } 2654 2655 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2656 { 2657 struct ifreq __user *uifr; 2658 int err; 2659 2660 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2661 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2662 return -EFAULT; 2663 2664 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2665 if (err) 2666 return err; 2667 2668 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2669 return -EFAULT; 2670 2671 return 0; 2672 } 2673 2674 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2675 { 2676 struct compat_ifconf ifc32; 2677 struct ifconf ifc; 2678 struct ifconf __user *uifc; 2679 struct compat_ifreq __user *ifr32; 2680 struct ifreq __user *ifr; 2681 unsigned int i, j; 2682 int err; 2683 2684 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2685 return -EFAULT; 2686 2687 memset(&ifc, 0, sizeof(ifc)); 2688 if (ifc32.ifcbuf == 0) { 2689 ifc32.ifc_len = 0; 2690 ifc.ifc_len = 0; 2691 ifc.ifc_req = NULL; 2692 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2693 } else { 2694 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * 2695 sizeof(struct ifreq); 2696 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2697 ifc.ifc_len = len; 2698 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2699 ifr32 = compat_ptr(ifc32.ifcbuf); 2700 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { 2701 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2702 return -EFAULT; 2703 ifr++; 2704 ifr32++; 2705 } 2706 } 2707 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2708 return -EFAULT; 2709 2710 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2711 if (err) 2712 return err; 2713 2714 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2715 return -EFAULT; 2716 2717 ifr = ifc.ifc_req; 2718 ifr32 = compat_ptr(ifc32.ifcbuf); 2719 for (i = 0, j = 0; 2720 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2721 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { 2722 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) 2723 return -EFAULT; 2724 ifr32++; 2725 ifr++; 2726 } 2727 2728 if (ifc32.ifcbuf == 0) { 2729 /* Translate from 64-bit structure multiple to 2730 * a 32-bit one. 2731 */ 2732 i = ifc.ifc_len; 2733 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2734 ifc32.ifc_len = i; 2735 } else { 2736 ifc32.ifc_len = i; 2737 } 2738 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2739 return -EFAULT; 2740 2741 return 0; 2742 } 2743 2744 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2745 { 2746 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2747 bool convert_in = false, convert_out = false; 2748 size_t buf_size = ALIGN(sizeof(struct ifreq), 8); 2749 struct ethtool_rxnfc __user *rxnfc; 2750 struct ifreq __user *ifr; 2751 u32 rule_cnt = 0, actual_rule_cnt; 2752 u32 ethcmd; 2753 u32 data; 2754 int ret; 2755 2756 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2757 return -EFAULT; 2758 2759 compat_rxnfc = compat_ptr(data); 2760 2761 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2762 return -EFAULT; 2763 2764 /* Most ethtool structures are defined without padding. 2765 * Unfortunately struct ethtool_rxnfc is an exception. 2766 */ 2767 switch (ethcmd) { 2768 default: 2769 break; 2770 case ETHTOOL_GRXCLSRLALL: 2771 /* Buffer size is variable */ 2772 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2773 return -EFAULT; 2774 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2775 return -ENOMEM; 2776 buf_size += rule_cnt * sizeof(u32); 2777 /* fall through */ 2778 case ETHTOOL_GRXRINGS: 2779 case ETHTOOL_GRXCLSRLCNT: 2780 case ETHTOOL_GRXCLSRULE: 2781 case ETHTOOL_SRXCLSRLINS: 2782 convert_out = true; 2783 /* fall through */ 2784 case ETHTOOL_SRXCLSRLDEL: 2785 buf_size += sizeof(struct ethtool_rxnfc); 2786 convert_in = true; 2787 break; 2788 } 2789 2790 ifr = compat_alloc_user_space(buf_size); 2791 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); 2792 2793 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2794 return -EFAULT; 2795 2796 if (put_user(convert_in ? rxnfc : compat_ptr(data), 2797 &ifr->ifr_ifru.ifru_data)) 2798 return -EFAULT; 2799 2800 if (convert_in) { 2801 /* We expect there to be holes between fs.m_ext and 2802 * fs.ring_cookie and at the end of fs, but nowhere else. 2803 */ 2804 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2805 sizeof(compat_rxnfc->fs.m_ext) != 2806 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2807 sizeof(rxnfc->fs.m_ext)); 2808 BUILD_BUG_ON( 2809 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2810 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2811 offsetof(struct ethtool_rxnfc, fs.location) - 2812 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2813 2814 if (copy_in_user(rxnfc, compat_rxnfc, 2815 (void __user *)(&rxnfc->fs.m_ext + 1) - 2816 (void __user *)rxnfc) || 2817 copy_in_user(&rxnfc->fs.ring_cookie, 2818 &compat_rxnfc->fs.ring_cookie, 2819 (void __user *)(&rxnfc->fs.location + 1) - 2820 (void __user *)&rxnfc->fs.ring_cookie) || 2821 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2822 sizeof(rxnfc->rule_cnt))) 2823 return -EFAULT; 2824 } 2825 2826 ret = dev_ioctl(net, SIOCETHTOOL, ifr); 2827 if (ret) 2828 return ret; 2829 2830 if (convert_out) { 2831 if (copy_in_user(compat_rxnfc, rxnfc, 2832 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2833 (const void __user *)rxnfc) || 2834 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2835 &rxnfc->fs.ring_cookie, 2836 (const void __user *)(&rxnfc->fs.location + 1) - 2837 (const void __user *)&rxnfc->fs.ring_cookie) || 2838 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2839 sizeof(rxnfc->rule_cnt))) 2840 return -EFAULT; 2841 2842 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2843 /* As an optimisation, we only copy the actual 2844 * number of rules that the underlying 2845 * function returned. Since Mallory might 2846 * change the rule count in user memory, we 2847 * check that it is less than the rule count 2848 * originally given (as the user buffer size), 2849 * which has been range-checked. 2850 */ 2851 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2852 return -EFAULT; 2853 if (actual_rule_cnt < rule_cnt) 2854 rule_cnt = actual_rule_cnt; 2855 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2856 &rxnfc->rule_locs[0], 2857 rule_cnt * sizeof(u32))) 2858 return -EFAULT; 2859 } 2860 } 2861 2862 return 0; 2863 } 2864 2865 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2866 { 2867 void __user *uptr; 2868 compat_uptr_t uptr32; 2869 struct ifreq __user *uifr; 2870 2871 uifr = compat_alloc_user_space(sizeof(*uifr)); 2872 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2873 return -EFAULT; 2874 2875 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2876 return -EFAULT; 2877 2878 uptr = compat_ptr(uptr32); 2879 2880 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2881 return -EFAULT; 2882 2883 return dev_ioctl(net, SIOCWANDEV, uifr); 2884 } 2885 2886 static int bond_ioctl(struct net *net, unsigned int cmd, 2887 struct compat_ifreq __user *ifr32) 2888 { 2889 struct ifreq kifr; 2890 mm_segment_t old_fs; 2891 int err; 2892 2893 switch (cmd) { 2894 case SIOCBONDENSLAVE: 2895 case SIOCBONDRELEASE: 2896 case SIOCBONDSETHWADDR: 2897 case SIOCBONDCHANGEACTIVE: 2898 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 2899 return -EFAULT; 2900 2901 old_fs = get_fs(); 2902 set_fs(KERNEL_DS); 2903 err = dev_ioctl(net, cmd, 2904 (struct ifreq __user __force *) &kifr); 2905 set_fs(old_fs); 2906 2907 return err; 2908 default: 2909 return -ENOIOCTLCMD; 2910 } 2911 } 2912 2913 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 2914 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 2915 struct compat_ifreq __user *u_ifreq32) 2916 { 2917 struct ifreq __user *u_ifreq64; 2918 char tmp_buf[IFNAMSIZ]; 2919 void __user *data64; 2920 u32 data32; 2921 2922 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 2923 IFNAMSIZ)) 2924 return -EFAULT; 2925 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 2926 return -EFAULT; 2927 data64 = compat_ptr(data32); 2928 2929 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 2930 2931 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 2932 IFNAMSIZ)) 2933 return -EFAULT; 2934 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 2935 return -EFAULT; 2936 2937 return dev_ioctl(net, cmd, u_ifreq64); 2938 } 2939 2940 static int dev_ifsioc(struct net *net, struct socket *sock, 2941 unsigned int cmd, struct compat_ifreq __user *uifr32) 2942 { 2943 struct ifreq __user *uifr; 2944 int err; 2945 2946 uifr = compat_alloc_user_space(sizeof(*uifr)); 2947 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 2948 return -EFAULT; 2949 2950 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 2951 2952 if (!err) { 2953 switch (cmd) { 2954 case SIOCGIFFLAGS: 2955 case SIOCGIFMETRIC: 2956 case SIOCGIFMTU: 2957 case SIOCGIFMEM: 2958 case SIOCGIFHWADDR: 2959 case SIOCGIFINDEX: 2960 case SIOCGIFADDR: 2961 case SIOCGIFBRDADDR: 2962 case SIOCGIFDSTADDR: 2963 case SIOCGIFNETMASK: 2964 case SIOCGIFPFLAGS: 2965 case SIOCGIFTXQLEN: 2966 case SIOCGMIIPHY: 2967 case SIOCGMIIREG: 2968 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 2969 err = -EFAULT; 2970 break; 2971 } 2972 } 2973 return err; 2974 } 2975 2976 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 2977 struct compat_ifreq __user *uifr32) 2978 { 2979 struct ifreq ifr; 2980 struct compat_ifmap __user *uifmap32; 2981 mm_segment_t old_fs; 2982 int err; 2983 2984 uifmap32 = &uifr32->ifr_ifru.ifru_map; 2985 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 2986 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2987 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2988 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2989 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 2990 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 2991 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 2992 if (err) 2993 return -EFAULT; 2994 2995 old_fs = get_fs(); 2996 set_fs(KERNEL_DS); 2997 err = dev_ioctl(net, cmd, (void __user __force *)&ifr); 2998 set_fs(old_fs); 2999 3000 if (cmd == SIOCGIFMAP && !err) { 3001 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3002 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3003 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3004 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3005 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3006 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3007 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3008 if (err) 3009 err = -EFAULT; 3010 } 3011 return err; 3012 } 3013 3014 struct rtentry32 { 3015 u32 rt_pad1; 3016 struct sockaddr rt_dst; /* target address */ 3017 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 3018 struct sockaddr rt_genmask; /* target network mask (IP) */ 3019 unsigned short rt_flags; 3020 short rt_pad2; 3021 u32 rt_pad3; 3022 unsigned char rt_tos; 3023 unsigned char rt_class; 3024 short rt_pad4; 3025 short rt_metric; /* +1 for binary compatibility! */ 3026 /* char * */ u32 rt_dev; /* forcing the device at add */ 3027 u32 rt_mtu; /* per route MTU/Window */ 3028 u32 rt_window; /* Window clamping */ 3029 unsigned short rt_irtt; /* Initial RTT */ 3030 }; 3031 3032 struct in6_rtmsg32 { 3033 struct in6_addr rtmsg_dst; 3034 struct in6_addr rtmsg_src; 3035 struct in6_addr rtmsg_gateway; 3036 u32 rtmsg_type; 3037 u16 rtmsg_dst_len; 3038 u16 rtmsg_src_len; 3039 u32 rtmsg_metric; 3040 u32 rtmsg_info; 3041 u32 rtmsg_flags; 3042 s32 rtmsg_ifindex; 3043 }; 3044 3045 static int routing_ioctl(struct net *net, struct socket *sock, 3046 unsigned int cmd, void __user *argp) 3047 { 3048 int ret; 3049 void *r = NULL; 3050 struct in6_rtmsg r6; 3051 struct rtentry r4; 3052 char devname[16]; 3053 u32 rtdev; 3054 mm_segment_t old_fs = get_fs(); 3055 3056 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3057 struct in6_rtmsg32 __user *ur6 = argp; 3058 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3059 3 * sizeof(struct in6_addr)); 3060 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3061 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3062 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3063 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3064 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3065 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3066 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3067 3068 r = (void *) &r6; 3069 } else { /* ipv4 */ 3070 struct rtentry32 __user *ur4 = argp; 3071 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3072 3 * sizeof(struct sockaddr)); 3073 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3074 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3075 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3076 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3077 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3078 ret |= get_user(rtdev, &(ur4->rt_dev)); 3079 if (rtdev) { 3080 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3081 r4.rt_dev = (char __user __force *)devname; 3082 devname[15] = 0; 3083 } else 3084 r4.rt_dev = NULL; 3085 3086 r = (void *) &r4; 3087 } 3088 3089 if (ret) { 3090 ret = -EFAULT; 3091 goto out; 3092 } 3093 3094 set_fs(KERNEL_DS); 3095 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3096 set_fs(old_fs); 3097 3098 out: 3099 return ret; 3100 } 3101 3102 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3103 * for some operations; this forces use of the newer bridge-utils that 3104 * use compatible ioctls 3105 */ 3106 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3107 { 3108 compat_ulong_t tmp; 3109 3110 if (get_user(tmp, argp)) 3111 return -EFAULT; 3112 if (tmp == BRCTL_GET_VERSION) 3113 return BRCTL_VERSION + 1; 3114 return -EINVAL; 3115 } 3116 3117 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3118 unsigned int cmd, unsigned long arg) 3119 { 3120 void __user *argp = compat_ptr(arg); 3121 struct sock *sk = sock->sk; 3122 struct net *net = sock_net(sk); 3123 3124 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3125 return compat_ifr_data_ioctl(net, cmd, argp); 3126 3127 switch (cmd) { 3128 case SIOCSIFBR: 3129 case SIOCGIFBR: 3130 return old_bridge_ioctl(argp); 3131 case SIOCGIFNAME: 3132 return dev_ifname32(net, argp); 3133 case SIOCGIFCONF: 3134 return dev_ifconf(net, argp); 3135 case SIOCETHTOOL: 3136 return ethtool_ioctl(net, argp); 3137 case SIOCWANDEV: 3138 return compat_siocwandev(net, argp); 3139 case SIOCGIFMAP: 3140 case SIOCSIFMAP: 3141 return compat_sioc_ifmap(net, cmd, argp); 3142 case SIOCBONDENSLAVE: 3143 case SIOCBONDRELEASE: 3144 case SIOCBONDSETHWADDR: 3145 case SIOCBONDCHANGEACTIVE: 3146 return bond_ioctl(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 return dev_ifsioc(net, sock, cmd, argp); 3207 3208 case SIOCSARP: 3209 case SIOCGARP: 3210 case SIOCDARP: 3211 case SIOCATMARK: 3212 return sock_do_ioctl(net, sock, cmd, arg); 3213 } 3214 3215 return -ENOIOCTLCMD; 3216 } 3217 3218 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3219 unsigned long arg) 3220 { 3221 struct socket *sock = file->private_data; 3222 int ret = -ENOIOCTLCMD; 3223 struct sock *sk; 3224 struct net *net; 3225 3226 sk = sock->sk; 3227 net = sock_net(sk); 3228 3229 if (sock->ops->compat_ioctl) 3230 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3231 3232 if (ret == -ENOIOCTLCMD && 3233 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3234 ret = compat_wext_handle_ioctl(net, cmd, arg); 3235 3236 if (ret == -ENOIOCTLCMD) 3237 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3238 3239 return ret; 3240 } 3241 #endif 3242 3243 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3244 { 3245 return sock->ops->bind(sock, addr, addrlen); 3246 } 3247 EXPORT_SYMBOL(kernel_bind); 3248 3249 int kernel_listen(struct socket *sock, int backlog) 3250 { 3251 return sock->ops->listen(sock, backlog); 3252 } 3253 EXPORT_SYMBOL(kernel_listen); 3254 3255 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3256 { 3257 struct sock *sk = sock->sk; 3258 int err; 3259 3260 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3261 newsock); 3262 if (err < 0) 3263 goto done; 3264 3265 err = sock->ops->accept(sock, *newsock, flags, true); 3266 if (err < 0) { 3267 sock_release(*newsock); 3268 *newsock = NULL; 3269 goto done; 3270 } 3271 3272 (*newsock)->ops = sock->ops; 3273 __module_get((*newsock)->ops->owner); 3274 3275 done: 3276 return err; 3277 } 3278 EXPORT_SYMBOL(kernel_accept); 3279 3280 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3281 int flags) 3282 { 3283 return sock->ops->connect(sock, addr, addrlen, flags); 3284 } 3285 EXPORT_SYMBOL(kernel_connect); 3286 3287 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3288 int *addrlen) 3289 { 3290 return sock->ops->getname(sock, addr, addrlen, 0); 3291 } 3292 EXPORT_SYMBOL(kernel_getsockname); 3293 3294 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3295 int *addrlen) 3296 { 3297 return sock->ops->getname(sock, addr, addrlen, 1); 3298 } 3299 EXPORT_SYMBOL(kernel_getpeername); 3300 3301 int kernel_getsockopt(struct socket *sock, int level, int optname, 3302 char *optval, int *optlen) 3303 { 3304 mm_segment_t oldfs = get_fs(); 3305 char __user *uoptval; 3306 int __user *uoptlen; 3307 int err; 3308 3309 uoptval = (char __user __force *) optval; 3310 uoptlen = (int __user __force *) optlen; 3311 3312 set_fs(KERNEL_DS); 3313 if (level == SOL_SOCKET) 3314 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3315 else 3316 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3317 uoptlen); 3318 set_fs(oldfs); 3319 return err; 3320 } 3321 EXPORT_SYMBOL(kernel_getsockopt); 3322 3323 int kernel_setsockopt(struct socket *sock, int level, int optname, 3324 char *optval, unsigned int optlen) 3325 { 3326 mm_segment_t oldfs = get_fs(); 3327 char __user *uoptval; 3328 int err; 3329 3330 uoptval = (char __user __force *) optval; 3331 3332 set_fs(KERNEL_DS); 3333 if (level == SOL_SOCKET) 3334 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3335 else 3336 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3337 optlen); 3338 set_fs(oldfs); 3339 return err; 3340 } 3341 EXPORT_SYMBOL(kernel_setsockopt); 3342 3343 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3344 size_t size, int flags) 3345 { 3346 if (sock->ops->sendpage) 3347 return sock->ops->sendpage(sock, page, offset, size, flags); 3348 3349 return sock_no_sendpage(sock, page, offset, size, flags); 3350 } 3351 EXPORT_SYMBOL(kernel_sendpage); 3352 3353 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3354 size_t size, int flags) 3355 { 3356 struct socket *sock = sk->sk_socket; 3357 3358 if (sock->ops->sendpage_locked) 3359 return sock->ops->sendpage_locked(sk, page, offset, size, 3360 flags); 3361 3362 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3363 } 3364 EXPORT_SYMBOL(kernel_sendpage_locked); 3365 3366 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3367 { 3368 mm_segment_t oldfs = get_fs(); 3369 int err; 3370 3371 set_fs(KERNEL_DS); 3372 err = sock->ops->ioctl(sock, cmd, arg); 3373 set_fs(oldfs); 3374 3375 return err; 3376 } 3377 EXPORT_SYMBOL(kernel_sock_ioctl); 3378 3379 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3380 { 3381 return sock->ops->shutdown(sock, how); 3382 } 3383 EXPORT_SYMBOL(kernel_sock_shutdown); 3384 3385 /* This routine returns the IP overhead imposed by a socket i.e. 3386 * the length of the underlying IP header, depending on whether 3387 * this is an IPv4 or IPv6 socket and the length from IP options turned 3388 * on at the socket. Assumes that the caller has a lock on the socket. 3389 */ 3390 u32 kernel_sock_ip_overhead(struct sock *sk) 3391 { 3392 struct inet_sock *inet; 3393 struct ip_options_rcu *opt; 3394 u32 overhead = 0; 3395 #if IS_ENABLED(CONFIG_IPV6) 3396 struct ipv6_pinfo *np; 3397 struct ipv6_txoptions *optv6 = NULL; 3398 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3399 3400 if (!sk) 3401 return overhead; 3402 3403 switch (sk->sk_family) { 3404 case AF_INET: 3405 inet = inet_sk(sk); 3406 overhead += sizeof(struct iphdr); 3407 opt = rcu_dereference_protected(inet->inet_opt, 3408 sock_owned_by_user(sk)); 3409 if (opt) 3410 overhead += opt->opt.optlen; 3411 return overhead; 3412 #if IS_ENABLED(CONFIG_IPV6) 3413 case AF_INET6: 3414 np = inet6_sk(sk); 3415 overhead += sizeof(struct ipv6hdr); 3416 if (np) 3417 optv6 = rcu_dereference_protected(np->opt, 3418 sock_owned_by_user(sk)); 3419 if (optv6) 3420 overhead += (optv6->opt_flen + optv6->opt_nflen); 3421 return overhead; 3422 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3423 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3424 return overhead; 3425 } 3426 } 3427 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3428