1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * NET An implementation of the SOCKET network access protocol. 4 * 5 * Version: @(#)socket.c 1.1.93 18/02/95 6 * 7 * Authors: Orest Zborowski, <obz@Kodak.COM> 8 * Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * 11 * Fixes: 12 * Anonymous : NOTSOCK/BADF cleanup. Error fix in 13 * shutdown() 14 * Alan Cox : verify_area() fixes 15 * Alan Cox : Removed DDI 16 * Jonathan Kamens : SOCK_DGRAM reconnect bug 17 * Alan Cox : Moved a load of checks to the very 18 * top level. 19 * Alan Cox : Move address structures to/from user 20 * mode above the protocol layers. 21 * Rob Janssen : Allow 0 length sends. 22 * Alan Cox : Asynchronous I/O support (cribbed from the 23 * tty drivers). 24 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 25 * Jeff Uphoff : Made max number of sockets command-line 26 * configurable. 27 * Matti Aarnio : Made the number of sockets dynamic, 28 * to be allocated when needed, and mr. 29 * Uphoff's max is used as max to be 30 * allowed to allocate. 31 * Linus : Argh. removed all the socket allocation 32 * altogether: it's in the inode now. 33 * Alan Cox : Made sock_alloc()/sock_release() public 34 * for NetROM and future kernel nfsd type 35 * stuff. 36 * Alan Cox : sendmsg/recvmsg basics. 37 * Tom Dyas : Export net symbols. 38 * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 39 * Alan Cox : Added thread locking to sys_* calls 40 * for sockets. May have errors at the 41 * moment. 42 * Kevin Buhr : Fixed the dumb errors in the above. 43 * Andi Kleen : Some small cleanups, optimizations, 44 * and fixed a copy_from_user() bug. 45 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 46 * Tigran Aivazian : Made listen(2) backlog sanity checks 47 * protocol-independent 48 * 49 * This module is effectively the top level interface to the BSD socket 50 * paradigm. 51 * 52 * Based upon Swansea University Computer Society NET3.039 53 */ 54 55 #include <linux/bpf-cgroup.h> 56 #include <linux/ethtool.h> 57 #include <linux/mm.h> 58 #include <linux/socket.h> 59 #include <linux/file.h> 60 #include <linux/net.h> 61 #include <linux/interrupt.h> 62 #include <linux/thread_info.h> 63 #include <linux/rcupdate.h> 64 #include <linux/netdevice.h> 65 #include <linux/proc_fs.h> 66 #include <linux/seq_file.h> 67 #include <linux/mutex.h> 68 #include <linux/if_bridge.h> 69 #include <linux/if_vlan.h> 70 #include <linux/ptp_classify.h> 71 #include <linux/init.h> 72 #include <linux/poll.h> 73 #include <linux/cache.h> 74 #include <linux/module.h> 75 #include <linux/highmem.h> 76 #include <linux/mount.h> 77 #include <linux/pseudo_fs.h> 78 #include <linux/security.h> 79 #include <linux/syscalls.h> 80 #include <linux/compat.h> 81 #include <linux/kmod.h> 82 #include <linux/audit.h> 83 #include <linux/wireless.h> 84 #include <linux/nsproxy.h> 85 #include <linux/magic.h> 86 #include <linux/slab.h> 87 #include <linux/xattr.h> 88 #include <linux/nospec.h> 89 #include <linux/indirect_call_wrapper.h> 90 91 #include <linux/uaccess.h> 92 #include <asm/unistd.h> 93 94 #include <net/compat.h> 95 #include <net/wext.h> 96 #include <net/cls_cgroup.h> 97 98 #include <net/sock.h> 99 #include <linux/netfilter.h> 100 101 #include <linux/if_tun.h> 102 #include <linux/ipv6_route.h> 103 #include <linux/route.h> 104 #include <linux/termios.h> 105 #include <linux/sockios.h> 106 #include <net/busy_poll.h> 107 #include <linux/errqueue.h> 108 #include <linux/ptp_clock_kernel.h> 109 110 #ifdef CONFIG_NET_RX_BUSY_POLL 111 unsigned int sysctl_net_busy_read __read_mostly; 112 unsigned int sysctl_net_busy_poll __read_mostly; 113 #endif 114 115 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 116 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 117 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 118 119 static int sock_close(struct inode *inode, struct file *file); 120 static __poll_t sock_poll(struct file *file, 121 struct poll_table_struct *wait); 122 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 123 #ifdef CONFIG_COMPAT 124 static long compat_sock_ioctl(struct file *file, 125 unsigned int cmd, unsigned long arg); 126 #endif 127 static int sock_fasync(int fd, struct file *filp, int on); 128 static ssize_t sock_sendpage(struct file *file, struct page *page, 129 int offset, size_t size, loff_t *ppos, int more); 130 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 131 struct pipe_inode_info *pipe, size_t len, 132 unsigned int flags); 133 134 #ifdef CONFIG_PROC_FS 135 static void sock_show_fdinfo(struct seq_file *m, struct file *f) 136 { 137 struct socket *sock = f->private_data; 138 139 if (sock->ops->show_fdinfo) 140 sock->ops->show_fdinfo(m, sock); 141 } 142 #else 143 #define sock_show_fdinfo NULL 144 #endif 145 146 /* 147 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 148 * in the operation structures but are done directly via the socketcall() multiplexor. 149 */ 150 151 static const struct file_operations socket_file_ops = { 152 .owner = THIS_MODULE, 153 .llseek = no_llseek, 154 .read_iter = sock_read_iter, 155 .write_iter = sock_write_iter, 156 .poll = sock_poll, 157 .unlocked_ioctl = sock_ioctl, 158 #ifdef CONFIG_COMPAT 159 .compat_ioctl = compat_sock_ioctl, 160 #endif 161 .mmap = sock_mmap, 162 .release = sock_close, 163 .fasync = sock_fasync, 164 .sendpage = sock_sendpage, 165 .splice_write = generic_splice_sendpage, 166 .splice_read = sock_splice_read, 167 .show_fdinfo = sock_show_fdinfo, 168 }; 169 170 static const char * const pf_family_names[] = { 171 [PF_UNSPEC] = "PF_UNSPEC", 172 [PF_UNIX] = "PF_UNIX/PF_LOCAL", 173 [PF_INET] = "PF_INET", 174 [PF_AX25] = "PF_AX25", 175 [PF_IPX] = "PF_IPX", 176 [PF_APPLETALK] = "PF_APPLETALK", 177 [PF_NETROM] = "PF_NETROM", 178 [PF_BRIDGE] = "PF_BRIDGE", 179 [PF_ATMPVC] = "PF_ATMPVC", 180 [PF_X25] = "PF_X25", 181 [PF_INET6] = "PF_INET6", 182 [PF_ROSE] = "PF_ROSE", 183 [PF_DECnet] = "PF_DECnet", 184 [PF_NETBEUI] = "PF_NETBEUI", 185 [PF_SECURITY] = "PF_SECURITY", 186 [PF_KEY] = "PF_KEY", 187 [PF_NETLINK] = "PF_NETLINK/PF_ROUTE", 188 [PF_PACKET] = "PF_PACKET", 189 [PF_ASH] = "PF_ASH", 190 [PF_ECONET] = "PF_ECONET", 191 [PF_ATMSVC] = "PF_ATMSVC", 192 [PF_RDS] = "PF_RDS", 193 [PF_SNA] = "PF_SNA", 194 [PF_IRDA] = "PF_IRDA", 195 [PF_PPPOX] = "PF_PPPOX", 196 [PF_WANPIPE] = "PF_WANPIPE", 197 [PF_LLC] = "PF_LLC", 198 [PF_IB] = "PF_IB", 199 [PF_MPLS] = "PF_MPLS", 200 [PF_CAN] = "PF_CAN", 201 [PF_TIPC] = "PF_TIPC", 202 [PF_BLUETOOTH] = "PF_BLUETOOTH", 203 [PF_IUCV] = "PF_IUCV", 204 [PF_RXRPC] = "PF_RXRPC", 205 [PF_ISDN] = "PF_ISDN", 206 [PF_PHONET] = "PF_PHONET", 207 [PF_IEEE802154] = "PF_IEEE802154", 208 [PF_CAIF] = "PF_CAIF", 209 [PF_ALG] = "PF_ALG", 210 [PF_NFC] = "PF_NFC", 211 [PF_VSOCK] = "PF_VSOCK", 212 [PF_KCM] = "PF_KCM", 213 [PF_QIPCRTR] = "PF_QIPCRTR", 214 [PF_SMC] = "PF_SMC", 215 [PF_XDP] = "PF_XDP", 216 [PF_MCTP] = "PF_MCTP", 217 }; 218 219 /* 220 * The protocol list. Each protocol is registered in here. 221 */ 222 223 static DEFINE_SPINLOCK(net_family_lock); 224 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 225 226 /* 227 * Support routines. 228 * Move socket addresses back and forth across the kernel/user 229 * divide and look after the messy bits. 230 */ 231 232 /** 233 * move_addr_to_kernel - copy a socket address into kernel space 234 * @uaddr: Address in user space 235 * @kaddr: Address in kernel space 236 * @ulen: Length in user space 237 * 238 * The address is copied into kernel space. If the provided address is 239 * too long an error code of -EINVAL is returned. If the copy gives 240 * invalid addresses -EFAULT is returned. On a success 0 is returned. 241 */ 242 243 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 244 { 245 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 246 return -EINVAL; 247 if (ulen == 0) 248 return 0; 249 if (copy_from_user(kaddr, uaddr, ulen)) 250 return -EFAULT; 251 return audit_sockaddr(ulen, kaddr); 252 } 253 254 /** 255 * move_addr_to_user - copy an address to user space 256 * @kaddr: kernel space address 257 * @klen: length of address in kernel 258 * @uaddr: user space address 259 * @ulen: pointer to user length field 260 * 261 * The value pointed to by ulen on entry is the buffer length available. 262 * This is overwritten with the buffer space used. -EINVAL is returned 263 * if an overlong buffer is specified or a negative buffer size. -EFAULT 264 * is returned if either the buffer or the length field are not 265 * accessible. 266 * After copying the data up to the limit the user specifies, the true 267 * length of the data is written over the length limit the user 268 * specified. Zero is returned for a success. 269 */ 270 271 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 272 void __user *uaddr, int __user *ulen) 273 { 274 int err; 275 int len; 276 277 BUG_ON(klen > sizeof(struct sockaddr_storage)); 278 err = get_user(len, ulen); 279 if (err) 280 return err; 281 if (len > klen) 282 len = klen; 283 if (len < 0) 284 return -EINVAL; 285 if (len) { 286 if (audit_sockaddr(klen, kaddr)) 287 return -ENOMEM; 288 if (copy_to_user(uaddr, kaddr, len)) 289 return -EFAULT; 290 } 291 /* 292 * "fromlen shall refer to the value before truncation.." 293 * 1003.1g 294 */ 295 return __put_user(klen, ulen); 296 } 297 298 static struct kmem_cache *sock_inode_cachep __ro_after_init; 299 300 static struct inode *sock_alloc_inode(struct super_block *sb) 301 { 302 struct socket_alloc *ei; 303 304 ei = alloc_inode_sb(sb, sock_inode_cachep, GFP_KERNEL); 305 if (!ei) 306 return NULL; 307 init_waitqueue_head(&ei->socket.wq.wait); 308 ei->socket.wq.fasync_list = NULL; 309 ei->socket.wq.flags = 0; 310 311 ei->socket.state = SS_UNCONNECTED; 312 ei->socket.flags = 0; 313 ei->socket.ops = NULL; 314 ei->socket.sk = NULL; 315 ei->socket.file = NULL; 316 317 return &ei->vfs_inode; 318 } 319 320 static void sock_free_inode(struct inode *inode) 321 { 322 struct socket_alloc *ei; 323 324 ei = container_of(inode, struct socket_alloc, vfs_inode); 325 kmem_cache_free(sock_inode_cachep, ei); 326 } 327 328 static void init_once(void *foo) 329 { 330 struct socket_alloc *ei = (struct socket_alloc *)foo; 331 332 inode_init_once(&ei->vfs_inode); 333 } 334 335 static void init_inodecache(void) 336 { 337 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 338 sizeof(struct socket_alloc), 339 0, 340 (SLAB_HWCACHE_ALIGN | 341 SLAB_RECLAIM_ACCOUNT | 342 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 343 init_once); 344 BUG_ON(sock_inode_cachep == NULL); 345 } 346 347 static const struct super_operations sockfs_ops = { 348 .alloc_inode = sock_alloc_inode, 349 .free_inode = sock_free_inode, 350 .statfs = simple_statfs, 351 }; 352 353 /* 354 * sockfs_dname() is called from d_path(). 355 */ 356 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 357 { 358 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 359 d_inode(dentry)->i_ino); 360 } 361 362 static const struct dentry_operations sockfs_dentry_operations = { 363 .d_dname = sockfs_dname, 364 }; 365 366 static int sockfs_xattr_get(const struct xattr_handler *handler, 367 struct dentry *dentry, struct inode *inode, 368 const char *suffix, void *value, size_t size) 369 { 370 if (value) { 371 if (dentry->d_name.len + 1 > size) 372 return -ERANGE; 373 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 374 } 375 return dentry->d_name.len + 1; 376 } 377 378 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 379 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 380 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 381 382 static const struct xattr_handler sockfs_xattr_handler = { 383 .name = XATTR_NAME_SOCKPROTONAME, 384 .get = sockfs_xattr_get, 385 }; 386 387 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 388 struct user_namespace *mnt_userns, 389 struct dentry *dentry, struct inode *inode, 390 const char *suffix, const void *value, 391 size_t size, int flags) 392 { 393 /* Handled by LSM. */ 394 return -EAGAIN; 395 } 396 397 static const struct xattr_handler sockfs_security_xattr_handler = { 398 .prefix = XATTR_SECURITY_PREFIX, 399 .set = sockfs_security_xattr_set, 400 }; 401 402 static const struct xattr_handler *sockfs_xattr_handlers[] = { 403 &sockfs_xattr_handler, 404 &sockfs_security_xattr_handler, 405 NULL 406 }; 407 408 static int sockfs_init_fs_context(struct fs_context *fc) 409 { 410 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); 411 if (!ctx) 412 return -ENOMEM; 413 ctx->ops = &sockfs_ops; 414 ctx->dops = &sockfs_dentry_operations; 415 ctx->xattr = sockfs_xattr_handlers; 416 return 0; 417 } 418 419 static struct vfsmount *sock_mnt __read_mostly; 420 421 static struct file_system_type sock_fs_type = { 422 .name = "sockfs", 423 .init_fs_context = sockfs_init_fs_context, 424 .kill_sb = kill_anon_super, 425 }; 426 427 /* 428 * Obtains the first available file descriptor and sets it up for use. 429 * 430 * These functions create file structures and maps them to fd space 431 * of the current process. On success it returns file descriptor 432 * and file struct implicitly stored in sock->file. 433 * Note that another thread may close file descriptor before we return 434 * from this function. We use the fact that now we do not refer 435 * to socket after mapping. If one day we will need it, this 436 * function will increment ref. count on file by 1. 437 * 438 * In any case returned fd MAY BE not valid! 439 * This race condition is unavoidable 440 * with shared fd spaces, we cannot solve it inside kernel, 441 * but we take care of internal coherence yet. 442 */ 443 444 /** 445 * sock_alloc_file - Bind a &socket to a &file 446 * @sock: socket 447 * @flags: file status flags 448 * @dname: protocol name 449 * 450 * Returns the &file bound with @sock, implicitly storing it 451 * in sock->file. If dname is %NULL, sets to "". 452 * On failure the return is a ERR pointer (see linux/err.h). 453 * This function uses GFP_KERNEL internally. 454 */ 455 456 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 457 { 458 struct file *file; 459 460 if (!dname) 461 dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; 462 463 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, 464 O_RDWR | (flags & O_NONBLOCK), 465 &socket_file_ops); 466 if (IS_ERR(file)) { 467 sock_release(sock); 468 return file; 469 } 470 471 sock->file = file; 472 file->private_data = sock; 473 stream_open(SOCK_INODE(sock), file); 474 return file; 475 } 476 EXPORT_SYMBOL(sock_alloc_file); 477 478 static int sock_map_fd(struct socket *sock, int flags) 479 { 480 struct file *newfile; 481 int fd = get_unused_fd_flags(flags); 482 if (unlikely(fd < 0)) { 483 sock_release(sock); 484 return fd; 485 } 486 487 newfile = sock_alloc_file(sock, flags, NULL); 488 if (!IS_ERR(newfile)) { 489 fd_install(fd, newfile); 490 return fd; 491 } 492 493 put_unused_fd(fd); 494 return PTR_ERR(newfile); 495 } 496 497 /** 498 * sock_from_file - Return the &socket bounded to @file. 499 * @file: file 500 * 501 * On failure returns %NULL. 502 */ 503 504 struct socket *sock_from_file(struct file *file) 505 { 506 if (file->f_op == &socket_file_ops) 507 return file->private_data; /* set in sock_alloc_file */ 508 509 return NULL; 510 } 511 EXPORT_SYMBOL(sock_from_file); 512 513 /** 514 * sockfd_lookup - Go from a file number to its socket slot 515 * @fd: file handle 516 * @err: pointer to an error code return 517 * 518 * The file handle passed in is locked and the socket it is bound 519 * to is returned. If an error occurs the err pointer is overwritten 520 * with a negative errno code and NULL is returned. The function checks 521 * for both invalid handles and passing a handle which is not a socket. 522 * 523 * On a success the socket object pointer is returned. 524 */ 525 526 struct socket *sockfd_lookup(int fd, int *err) 527 { 528 struct file *file; 529 struct socket *sock; 530 531 file = fget(fd); 532 if (!file) { 533 *err = -EBADF; 534 return NULL; 535 } 536 537 sock = sock_from_file(file); 538 if (!sock) { 539 *err = -ENOTSOCK; 540 fput(file); 541 } 542 return sock; 543 } 544 EXPORT_SYMBOL(sockfd_lookup); 545 546 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 547 { 548 struct fd f = fdget(fd); 549 struct socket *sock; 550 551 *err = -EBADF; 552 if (f.file) { 553 sock = sock_from_file(f.file); 554 if (likely(sock)) { 555 *fput_needed = f.flags & FDPUT_FPUT; 556 return sock; 557 } 558 *err = -ENOTSOCK; 559 fdput(f); 560 } 561 return NULL; 562 } 563 564 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 565 size_t size) 566 { 567 ssize_t len; 568 ssize_t used = 0; 569 570 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 571 if (len < 0) 572 return len; 573 used += len; 574 if (buffer) { 575 if (size < used) 576 return -ERANGE; 577 buffer += len; 578 } 579 580 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 581 used += len; 582 if (buffer) { 583 if (size < used) 584 return -ERANGE; 585 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 586 buffer += len; 587 } 588 589 return used; 590 } 591 592 static int sockfs_setattr(struct user_namespace *mnt_userns, 593 struct dentry *dentry, struct iattr *iattr) 594 { 595 int err = simple_setattr(&init_user_ns, dentry, iattr); 596 597 if (!err && (iattr->ia_valid & ATTR_UID)) { 598 struct socket *sock = SOCKET_I(d_inode(dentry)); 599 600 if (sock->sk) 601 sock->sk->sk_uid = iattr->ia_uid; 602 else 603 err = -ENOENT; 604 } 605 606 return err; 607 } 608 609 static const struct inode_operations sockfs_inode_ops = { 610 .listxattr = sockfs_listxattr, 611 .setattr = sockfs_setattr, 612 }; 613 614 /** 615 * sock_alloc - allocate a socket 616 * 617 * Allocate a new inode and socket object. The two are bound together 618 * and initialised. The socket is then returned. If we are out of inodes 619 * NULL is returned. This functions uses GFP_KERNEL internally. 620 */ 621 622 struct socket *sock_alloc(void) 623 { 624 struct inode *inode; 625 struct socket *sock; 626 627 inode = new_inode_pseudo(sock_mnt->mnt_sb); 628 if (!inode) 629 return NULL; 630 631 sock = SOCKET_I(inode); 632 633 inode->i_ino = get_next_ino(); 634 inode->i_mode = S_IFSOCK | S_IRWXUGO; 635 inode->i_uid = current_fsuid(); 636 inode->i_gid = current_fsgid(); 637 inode->i_op = &sockfs_inode_ops; 638 639 return sock; 640 } 641 EXPORT_SYMBOL(sock_alloc); 642 643 static void __sock_release(struct socket *sock, struct inode *inode) 644 { 645 if (sock->ops) { 646 struct module *owner = sock->ops->owner; 647 648 if (inode) 649 inode_lock(inode); 650 sock->ops->release(sock); 651 sock->sk = NULL; 652 if (inode) 653 inode_unlock(inode); 654 sock->ops = NULL; 655 module_put(owner); 656 } 657 658 if (sock->wq.fasync_list) 659 pr_err("%s: fasync list not empty!\n", __func__); 660 661 if (!sock->file) { 662 iput(SOCK_INODE(sock)); 663 return; 664 } 665 sock->file = NULL; 666 } 667 668 /** 669 * sock_release - close a socket 670 * @sock: socket to close 671 * 672 * The socket is released from the protocol stack if it has a release 673 * callback, and the inode is then released if the socket is bound to 674 * an inode not a file. 675 */ 676 void sock_release(struct socket *sock) 677 { 678 __sock_release(sock, NULL); 679 } 680 EXPORT_SYMBOL(sock_release); 681 682 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 683 { 684 u8 flags = *tx_flags; 685 686 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) { 687 flags |= SKBTX_HW_TSTAMP; 688 689 /* PTP hardware clocks can provide a free running cycle counter 690 * as a time base for virtual clocks. Tell driver to use the 691 * free running cycle counter for timestamp if socket is bound 692 * to virtual clock. 693 */ 694 if (tsflags & SOF_TIMESTAMPING_BIND_PHC) 695 flags |= SKBTX_HW_TSTAMP_USE_CYCLES; 696 } 697 698 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 699 flags |= SKBTX_SW_TSTAMP; 700 701 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 702 flags |= SKBTX_SCHED_TSTAMP; 703 704 *tx_flags = flags; 705 } 706 EXPORT_SYMBOL(__sock_tx_timestamp); 707 708 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, 709 size_t)); 710 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, 711 size_t)); 712 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 713 { 714 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, 715 inet_sendmsg, sock, msg, 716 msg_data_left(msg)); 717 BUG_ON(ret == -EIOCBQUEUED); 718 return ret; 719 } 720 721 /** 722 * sock_sendmsg - send a message through @sock 723 * @sock: socket 724 * @msg: message to send 725 * 726 * Sends @msg through @sock, passing through LSM. 727 * Returns the number of bytes sent, or an error code. 728 */ 729 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 730 { 731 int err = security_socket_sendmsg(sock, msg, 732 msg_data_left(msg)); 733 734 return err ?: sock_sendmsg_nosec(sock, msg); 735 } 736 EXPORT_SYMBOL(sock_sendmsg); 737 738 /** 739 * kernel_sendmsg - send a message through @sock (kernel-space) 740 * @sock: socket 741 * @msg: message header 742 * @vec: kernel vec 743 * @num: vec array length 744 * @size: total message data size 745 * 746 * Builds the message data with @vec and sends it through @sock. 747 * Returns the number of bytes sent, or an error code. 748 */ 749 750 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 751 struct kvec *vec, size_t num, size_t size) 752 { 753 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 754 return sock_sendmsg(sock, msg); 755 } 756 EXPORT_SYMBOL(kernel_sendmsg); 757 758 /** 759 * kernel_sendmsg_locked - send a message through @sock (kernel-space) 760 * @sk: sock 761 * @msg: message header 762 * @vec: output s/g array 763 * @num: output s/g array length 764 * @size: total message data size 765 * 766 * Builds the message data with @vec and sends it through @sock. 767 * Returns the number of bytes sent, or an error code. 768 * Caller must hold @sk. 769 */ 770 771 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 772 struct kvec *vec, size_t num, size_t size) 773 { 774 struct socket *sock = sk->sk_socket; 775 776 if (!sock->ops->sendmsg_locked) 777 return sock_no_sendmsg_locked(sk, msg, size); 778 779 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 780 781 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 782 } 783 EXPORT_SYMBOL(kernel_sendmsg_locked); 784 785 static bool skb_is_err_queue(const struct sk_buff *skb) 786 { 787 /* pkt_type of skbs enqueued on the error queue are set to 788 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 789 * in recvmsg, since skbs received on a local socket will never 790 * have a pkt_type of PACKET_OUTGOING. 791 */ 792 return skb->pkt_type == PACKET_OUTGOING; 793 } 794 795 /* On transmit, software and hardware timestamps are returned independently. 796 * As the two skb clones share the hardware timestamp, which may be updated 797 * before the software timestamp is received, a hardware TX timestamp may be 798 * returned only if there is no software TX timestamp. Ignore false software 799 * timestamps, which may be made in the __sock_recv_timestamp() call when the 800 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a 801 * hardware timestamp. 802 */ 803 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 804 { 805 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 806 } 807 808 static ktime_t get_timestamp(struct sock *sk, struct sk_buff *skb, int *if_index) 809 { 810 bool cycles = sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC; 811 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); 812 struct net_device *orig_dev; 813 ktime_t hwtstamp; 814 815 rcu_read_lock(); 816 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 817 if (orig_dev) { 818 *if_index = orig_dev->ifindex; 819 hwtstamp = netdev_get_tstamp(orig_dev, shhwtstamps, cycles); 820 } else { 821 hwtstamp = shhwtstamps->hwtstamp; 822 } 823 rcu_read_unlock(); 824 825 return hwtstamp; 826 } 827 828 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb, 829 int if_index) 830 { 831 struct scm_ts_pktinfo ts_pktinfo; 832 struct net_device *orig_dev; 833 834 if (!skb_mac_header_was_set(skb)) 835 return; 836 837 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 838 839 if (!if_index) { 840 rcu_read_lock(); 841 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 842 if (orig_dev) 843 if_index = orig_dev->ifindex; 844 rcu_read_unlock(); 845 } 846 ts_pktinfo.if_index = if_index; 847 848 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 849 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 850 sizeof(ts_pktinfo), &ts_pktinfo); 851 } 852 853 /* 854 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 855 */ 856 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 857 struct sk_buff *skb) 858 { 859 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 860 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); 861 struct scm_timestamping_internal tss; 862 863 int empty = 1, false_tstamp = 0; 864 struct skb_shared_hwtstamps *shhwtstamps = 865 skb_hwtstamps(skb); 866 int if_index; 867 ktime_t hwtstamp; 868 869 /* Race occurred between timestamp enabling and packet 870 receiving. Fill in the current time for now. */ 871 if (need_software_tstamp && skb->tstamp == 0) { 872 __net_timestamp(skb); 873 false_tstamp = 1; 874 } 875 876 if (need_software_tstamp) { 877 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 878 if (new_tstamp) { 879 struct __kernel_sock_timeval tv; 880 881 skb_get_new_timestamp(skb, &tv); 882 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, 883 sizeof(tv), &tv); 884 } else { 885 struct __kernel_old_timeval tv; 886 887 skb_get_timestamp(skb, &tv); 888 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, 889 sizeof(tv), &tv); 890 } 891 } else { 892 if (new_tstamp) { 893 struct __kernel_timespec ts; 894 895 skb_get_new_timestampns(skb, &ts); 896 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, 897 sizeof(ts), &ts); 898 } else { 899 struct __kernel_old_timespec ts; 900 901 skb_get_timestampns(skb, &ts); 902 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, 903 sizeof(ts), &ts); 904 } 905 } 906 } 907 908 memset(&tss, 0, sizeof(tss)); 909 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 910 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) 911 empty = 0; 912 if (shhwtstamps && 913 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 914 !skb_is_swtx_tstamp(skb, false_tstamp)) { 915 if_index = 0; 916 if (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP_NETDEV) 917 hwtstamp = get_timestamp(sk, skb, &if_index); 918 else 919 hwtstamp = shhwtstamps->hwtstamp; 920 921 if (sk->sk_tsflags & SOF_TIMESTAMPING_BIND_PHC) 922 hwtstamp = ptp_convert_timestamp(&hwtstamp, 923 sk->sk_bind_phc); 924 925 if (ktime_to_timespec64_cond(hwtstamp, tss.ts + 2)) { 926 empty = 0; 927 928 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 929 !skb_is_err_queue(skb)) 930 put_ts_pktinfo(msg, skb, if_index); 931 } 932 } 933 if (!empty) { 934 if (sock_flag(sk, SOCK_TSTAMP_NEW)) 935 put_cmsg_scm_timestamping64(msg, &tss); 936 else 937 put_cmsg_scm_timestamping(msg, &tss); 938 939 if (skb_is_err_queue(skb) && skb->len && 940 SKB_EXT_ERR(skb)->opt_stats) 941 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 942 skb->len, skb->data); 943 } 944 } 945 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 946 947 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 948 struct sk_buff *skb) 949 { 950 int ack; 951 952 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 953 return; 954 if (!skb->wifi_acked_valid) 955 return; 956 957 ack = skb->wifi_acked; 958 959 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 960 } 961 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 962 963 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 964 struct sk_buff *skb) 965 { 966 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 967 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 968 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 969 } 970 971 static void sock_recv_mark(struct msghdr *msg, struct sock *sk, 972 struct sk_buff *skb) 973 { 974 if (sock_flag(sk, SOCK_RCVMARK) && skb) 975 put_cmsg(msg, SOL_SOCKET, SO_MARK, sizeof(__u32), 976 &skb->mark); 977 } 978 979 void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk, 980 struct sk_buff *skb) 981 { 982 sock_recv_timestamp(msg, sk, skb); 983 sock_recv_drops(msg, sk, skb); 984 sock_recv_mark(msg, sk, skb); 985 } 986 EXPORT_SYMBOL_GPL(__sock_recv_cmsgs); 987 988 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, 989 size_t, int)); 990 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, 991 size_t, int)); 992 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 993 int flags) 994 { 995 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, 996 inet_recvmsg, sock, msg, msg_data_left(msg), 997 flags); 998 } 999 1000 /** 1001 * sock_recvmsg - receive a message from @sock 1002 * @sock: socket 1003 * @msg: message to receive 1004 * @flags: message flags 1005 * 1006 * Receives @msg from @sock, passing through LSM. Returns the total number 1007 * of bytes received, or an error. 1008 */ 1009 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 1010 { 1011 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 1012 1013 return err ?: sock_recvmsg_nosec(sock, msg, flags); 1014 } 1015 EXPORT_SYMBOL(sock_recvmsg); 1016 1017 /** 1018 * kernel_recvmsg - Receive a message from a socket (kernel space) 1019 * @sock: The socket to receive the message from 1020 * @msg: Received message 1021 * @vec: Input s/g array for message data 1022 * @num: Size of input s/g array 1023 * @size: Number of bytes to read 1024 * @flags: Message flags (MSG_DONTWAIT, etc...) 1025 * 1026 * On return the msg structure contains the scatter/gather array passed in the 1027 * vec argument. The array is modified so that it consists of the unfilled 1028 * portion of the original array. 1029 * 1030 * The returned value is the total number of bytes received, or an error. 1031 */ 1032 1033 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 1034 struct kvec *vec, size_t num, size_t size, int flags) 1035 { 1036 msg->msg_control_is_user = false; 1037 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); 1038 return sock_recvmsg(sock, msg, flags); 1039 } 1040 EXPORT_SYMBOL(kernel_recvmsg); 1041 1042 static ssize_t sock_sendpage(struct file *file, struct page *page, 1043 int offset, size_t size, loff_t *ppos, int more) 1044 { 1045 struct socket *sock; 1046 int flags; 1047 1048 sock = file->private_data; 1049 1050 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 1051 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 1052 flags |= more; 1053 1054 return kernel_sendpage(sock, page, offset, size, flags); 1055 } 1056 1057 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 1058 struct pipe_inode_info *pipe, size_t len, 1059 unsigned int flags) 1060 { 1061 struct socket *sock = file->private_data; 1062 1063 if (unlikely(!sock->ops->splice_read)) 1064 return generic_file_splice_read(file, ppos, pipe, len, flags); 1065 1066 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 1067 } 1068 1069 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 1070 { 1071 struct file *file = iocb->ki_filp; 1072 struct socket *sock = file->private_data; 1073 struct msghdr msg = {.msg_iter = *to, 1074 .msg_iocb = iocb}; 1075 ssize_t res; 1076 1077 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) 1078 msg.msg_flags = MSG_DONTWAIT; 1079 1080 if (iocb->ki_pos != 0) 1081 return -ESPIPE; 1082 1083 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 1084 return 0; 1085 1086 res = sock_recvmsg(sock, &msg, msg.msg_flags); 1087 *to = msg.msg_iter; 1088 return res; 1089 } 1090 1091 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 1092 { 1093 struct file *file = iocb->ki_filp; 1094 struct socket *sock = file->private_data; 1095 struct msghdr msg = {.msg_iter = *from, 1096 .msg_iocb = iocb}; 1097 ssize_t res; 1098 1099 if (iocb->ki_pos != 0) 1100 return -ESPIPE; 1101 1102 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) 1103 msg.msg_flags = MSG_DONTWAIT; 1104 1105 if (sock->type == SOCK_SEQPACKET) 1106 msg.msg_flags |= MSG_EOR; 1107 1108 res = sock_sendmsg(sock, &msg); 1109 *from = msg.msg_iter; 1110 return res; 1111 } 1112 1113 /* 1114 * Atomic setting of ioctl hooks to avoid race 1115 * with module unload. 1116 */ 1117 1118 static DEFINE_MUTEX(br_ioctl_mutex); 1119 static int (*br_ioctl_hook)(struct net *net, struct net_bridge *br, 1120 unsigned int cmd, struct ifreq *ifr, 1121 void __user *uarg); 1122 1123 void brioctl_set(int (*hook)(struct net *net, struct net_bridge *br, 1124 unsigned int cmd, struct ifreq *ifr, 1125 void __user *uarg)) 1126 { 1127 mutex_lock(&br_ioctl_mutex); 1128 br_ioctl_hook = hook; 1129 mutex_unlock(&br_ioctl_mutex); 1130 } 1131 EXPORT_SYMBOL(brioctl_set); 1132 1133 int br_ioctl_call(struct net *net, struct net_bridge *br, unsigned int cmd, 1134 struct ifreq *ifr, void __user *uarg) 1135 { 1136 int err = -ENOPKG; 1137 1138 if (!br_ioctl_hook) 1139 request_module("bridge"); 1140 1141 mutex_lock(&br_ioctl_mutex); 1142 if (br_ioctl_hook) 1143 err = br_ioctl_hook(net, br, cmd, ifr, uarg); 1144 mutex_unlock(&br_ioctl_mutex); 1145 1146 return err; 1147 } 1148 1149 static DEFINE_MUTEX(vlan_ioctl_mutex); 1150 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 1151 1152 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 1153 { 1154 mutex_lock(&vlan_ioctl_mutex); 1155 vlan_ioctl_hook = hook; 1156 mutex_unlock(&vlan_ioctl_mutex); 1157 } 1158 EXPORT_SYMBOL(vlan_ioctl_set); 1159 1160 static long sock_do_ioctl(struct net *net, struct socket *sock, 1161 unsigned int cmd, unsigned long arg) 1162 { 1163 struct ifreq ifr; 1164 bool need_copyout; 1165 int err; 1166 void __user *argp = (void __user *)arg; 1167 void __user *data; 1168 1169 err = sock->ops->ioctl(sock, cmd, arg); 1170 1171 /* 1172 * If this ioctl is unknown try to hand it down 1173 * to the NIC driver. 1174 */ 1175 if (err != -ENOIOCTLCMD) 1176 return err; 1177 1178 if (!is_socket_ioctl_cmd(cmd)) 1179 return -ENOTTY; 1180 1181 if (get_user_ifreq(&ifr, &data, argp)) 1182 return -EFAULT; 1183 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); 1184 if (!err && need_copyout) 1185 if (put_user_ifreq(&ifr, argp)) 1186 return -EFAULT; 1187 1188 return err; 1189 } 1190 1191 /* 1192 * With an ioctl, arg may well be a user mode pointer, but we don't know 1193 * what to do with it - that's up to the protocol still. 1194 */ 1195 1196 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 1197 { 1198 struct socket *sock; 1199 struct sock *sk; 1200 void __user *argp = (void __user *)arg; 1201 int pid, err; 1202 struct net *net; 1203 1204 sock = file->private_data; 1205 sk = sock->sk; 1206 net = sock_net(sk); 1207 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { 1208 struct ifreq ifr; 1209 void __user *data; 1210 bool need_copyout; 1211 if (get_user_ifreq(&ifr, &data, argp)) 1212 return -EFAULT; 1213 err = dev_ioctl(net, cmd, &ifr, data, &need_copyout); 1214 if (!err && need_copyout) 1215 if (put_user_ifreq(&ifr, argp)) 1216 return -EFAULT; 1217 } else 1218 #ifdef CONFIG_WEXT_CORE 1219 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1220 err = wext_handle_ioctl(net, cmd, argp); 1221 } else 1222 #endif 1223 switch (cmd) { 1224 case FIOSETOWN: 1225 case SIOCSPGRP: 1226 err = -EFAULT; 1227 if (get_user(pid, (int __user *)argp)) 1228 break; 1229 err = f_setown(sock->file, pid, 1); 1230 break; 1231 case FIOGETOWN: 1232 case SIOCGPGRP: 1233 err = put_user(f_getown(sock->file), 1234 (int __user *)argp); 1235 break; 1236 case SIOCGIFBR: 1237 case SIOCSIFBR: 1238 case SIOCBRADDBR: 1239 case SIOCBRDELBR: 1240 err = br_ioctl_call(net, NULL, cmd, NULL, argp); 1241 break; 1242 case SIOCGIFVLAN: 1243 case SIOCSIFVLAN: 1244 err = -ENOPKG; 1245 if (!vlan_ioctl_hook) 1246 request_module("8021q"); 1247 1248 mutex_lock(&vlan_ioctl_mutex); 1249 if (vlan_ioctl_hook) 1250 err = vlan_ioctl_hook(net, argp); 1251 mutex_unlock(&vlan_ioctl_mutex); 1252 break; 1253 case SIOCGSKNS: 1254 err = -EPERM; 1255 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1256 break; 1257 1258 err = open_related_ns(&net->ns, get_net_ns); 1259 break; 1260 case SIOCGSTAMP_OLD: 1261 case SIOCGSTAMPNS_OLD: 1262 if (!sock->ops->gettstamp) { 1263 err = -ENOIOCTLCMD; 1264 break; 1265 } 1266 err = sock->ops->gettstamp(sock, argp, 1267 cmd == SIOCGSTAMP_OLD, 1268 !IS_ENABLED(CONFIG_64BIT)); 1269 break; 1270 case SIOCGSTAMP_NEW: 1271 case SIOCGSTAMPNS_NEW: 1272 if (!sock->ops->gettstamp) { 1273 err = -ENOIOCTLCMD; 1274 break; 1275 } 1276 err = sock->ops->gettstamp(sock, argp, 1277 cmd == SIOCGSTAMP_NEW, 1278 false); 1279 break; 1280 1281 case SIOCGIFCONF: 1282 err = dev_ifconf(net, argp); 1283 break; 1284 1285 default: 1286 err = sock_do_ioctl(net, sock, cmd, arg); 1287 break; 1288 } 1289 return err; 1290 } 1291 1292 /** 1293 * sock_create_lite - creates a socket 1294 * @family: protocol family (AF_INET, ...) 1295 * @type: communication type (SOCK_STREAM, ...) 1296 * @protocol: protocol (0, ...) 1297 * @res: new socket 1298 * 1299 * Creates a new socket and assigns it to @res, passing through LSM. 1300 * The new socket initialization is not complete, see kernel_accept(). 1301 * Returns 0 or an error. On failure @res is set to %NULL. 1302 * This function internally uses GFP_KERNEL. 1303 */ 1304 1305 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1306 { 1307 int err; 1308 struct socket *sock = NULL; 1309 1310 err = security_socket_create(family, type, protocol, 1); 1311 if (err) 1312 goto out; 1313 1314 sock = sock_alloc(); 1315 if (!sock) { 1316 err = -ENOMEM; 1317 goto out; 1318 } 1319 1320 sock->type = type; 1321 err = security_socket_post_create(sock, family, type, protocol, 1); 1322 if (err) 1323 goto out_release; 1324 1325 out: 1326 *res = sock; 1327 return err; 1328 out_release: 1329 sock_release(sock); 1330 sock = NULL; 1331 goto out; 1332 } 1333 EXPORT_SYMBOL(sock_create_lite); 1334 1335 /* No kernel lock held - perfect */ 1336 static __poll_t sock_poll(struct file *file, poll_table *wait) 1337 { 1338 struct socket *sock = file->private_data; 1339 __poll_t events = poll_requested_events(wait), flag = 0; 1340 1341 if (!sock->ops->poll) 1342 return 0; 1343 1344 if (sk_can_busy_loop(sock->sk)) { 1345 /* poll once if requested by the syscall */ 1346 if (events & POLL_BUSY_LOOP) 1347 sk_busy_loop(sock->sk, 1); 1348 1349 /* if this socket can poll_ll, tell the system call */ 1350 flag = POLL_BUSY_LOOP; 1351 } 1352 1353 return sock->ops->poll(file, sock, wait) | flag; 1354 } 1355 1356 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1357 { 1358 struct socket *sock = file->private_data; 1359 1360 return sock->ops->mmap(file, sock, vma); 1361 } 1362 1363 static int sock_close(struct inode *inode, struct file *filp) 1364 { 1365 __sock_release(SOCKET_I(inode), inode); 1366 return 0; 1367 } 1368 1369 /* 1370 * Update the socket async list 1371 * 1372 * Fasync_list locking strategy. 1373 * 1374 * 1. fasync_list is modified only under process context socket lock 1375 * i.e. under semaphore. 1376 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1377 * or under socket lock 1378 */ 1379 1380 static int sock_fasync(int fd, struct file *filp, int on) 1381 { 1382 struct socket *sock = filp->private_data; 1383 struct sock *sk = sock->sk; 1384 struct socket_wq *wq = &sock->wq; 1385 1386 if (sk == NULL) 1387 return -EINVAL; 1388 1389 lock_sock(sk); 1390 fasync_helper(fd, filp, on, &wq->fasync_list); 1391 1392 if (!wq->fasync_list) 1393 sock_reset_flag(sk, SOCK_FASYNC); 1394 else 1395 sock_set_flag(sk, SOCK_FASYNC); 1396 1397 release_sock(sk); 1398 return 0; 1399 } 1400 1401 /* This function may be called only under rcu_lock */ 1402 1403 int sock_wake_async(struct socket_wq *wq, int how, int band) 1404 { 1405 if (!wq || !wq->fasync_list) 1406 return -1; 1407 1408 switch (how) { 1409 case SOCK_WAKE_WAITD: 1410 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1411 break; 1412 goto call_kill; 1413 case SOCK_WAKE_SPACE: 1414 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1415 break; 1416 fallthrough; 1417 case SOCK_WAKE_IO: 1418 call_kill: 1419 kill_fasync(&wq->fasync_list, SIGIO, band); 1420 break; 1421 case SOCK_WAKE_URG: 1422 kill_fasync(&wq->fasync_list, SIGURG, band); 1423 } 1424 1425 return 0; 1426 } 1427 EXPORT_SYMBOL(sock_wake_async); 1428 1429 /** 1430 * __sock_create - creates a socket 1431 * @net: net namespace 1432 * @family: protocol family (AF_INET, ...) 1433 * @type: communication type (SOCK_STREAM, ...) 1434 * @protocol: protocol (0, ...) 1435 * @res: new socket 1436 * @kern: boolean for kernel space sockets 1437 * 1438 * Creates a new socket and assigns it to @res, passing through LSM. 1439 * Returns 0 or an error. On failure @res is set to %NULL. @kern must 1440 * be set to true if the socket resides in kernel space. 1441 * This function internally uses GFP_KERNEL. 1442 */ 1443 1444 int __sock_create(struct net *net, int family, int type, int protocol, 1445 struct socket **res, int kern) 1446 { 1447 int err; 1448 struct socket *sock; 1449 const struct net_proto_family *pf; 1450 1451 /* 1452 * Check protocol is in range 1453 */ 1454 if (family < 0 || family >= NPROTO) 1455 return -EAFNOSUPPORT; 1456 if (type < 0 || type >= SOCK_MAX) 1457 return -EINVAL; 1458 1459 /* Compatibility. 1460 1461 This uglymoron is moved from INET layer to here to avoid 1462 deadlock in module load. 1463 */ 1464 if (family == PF_INET && type == SOCK_PACKET) { 1465 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1466 current->comm); 1467 family = PF_PACKET; 1468 } 1469 1470 err = security_socket_create(family, type, protocol, kern); 1471 if (err) 1472 return err; 1473 1474 /* 1475 * Allocate the socket and allow the family to set things up. if 1476 * the protocol is 0, the family is instructed to select an appropriate 1477 * default. 1478 */ 1479 sock = sock_alloc(); 1480 if (!sock) { 1481 net_warn_ratelimited("socket: no more sockets\n"); 1482 return -ENFILE; /* Not exactly a match, but its the 1483 closest posix thing */ 1484 } 1485 1486 sock->type = type; 1487 1488 #ifdef CONFIG_MODULES 1489 /* Attempt to load a protocol module if the find failed. 1490 * 1491 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1492 * requested real, full-featured networking support upon configuration. 1493 * Otherwise module support will break! 1494 */ 1495 if (rcu_access_pointer(net_families[family]) == NULL) 1496 request_module("net-pf-%d", family); 1497 #endif 1498 1499 rcu_read_lock(); 1500 pf = rcu_dereference(net_families[family]); 1501 err = -EAFNOSUPPORT; 1502 if (!pf) 1503 goto out_release; 1504 1505 /* 1506 * We will call the ->create function, that possibly is in a loadable 1507 * module, so we have to bump that loadable module refcnt first. 1508 */ 1509 if (!try_module_get(pf->owner)) 1510 goto out_release; 1511 1512 /* Now protected by module ref count */ 1513 rcu_read_unlock(); 1514 1515 err = pf->create(net, sock, protocol, kern); 1516 if (err < 0) 1517 goto out_module_put; 1518 1519 /* 1520 * Now to bump the refcnt of the [loadable] module that owns this 1521 * socket at sock_release time we decrement its refcnt. 1522 */ 1523 if (!try_module_get(sock->ops->owner)) 1524 goto out_module_busy; 1525 1526 /* 1527 * Now that we're done with the ->create function, the [loadable] 1528 * module can have its refcnt decremented 1529 */ 1530 module_put(pf->owner); 1531 err = security_socket_post_create(sock, family, type, protocol, kern); 1532 if (err) 1533 goto out_sock_release; 1534 *res = sock; 1535 1536 return 0; 1537 1538 out_module_busy: 1539 err = -EAFNOSUPPORT; 1540 out_module_put: 1541 sock->ops = NULL; 1542 module_put(pf->owner); 1543 out_sock_release: 1544 sock_release(sock); 1545 return err; 1546 1547 out_release: 1548 rcu_read_unlock(); 1549 goto out_sock_release; 1550 } 1551 EXPORT_SYMBOL(__sock_create); 1552 1553 /** 1554 * sock_create - creates a socket 1555 * @family: protocol family (AF_INET, ...) 1556 * @type: communication type (SOCK_STREAM, ...) 1557 * @protocol: protocol (0, ...) 1558 * @res: new socket 1559 * 1560 * A wrapper around __sock_create(). 1561 * Returns 0 or an error. This function internally uses GFP_KERNEL. 1562 */ 1563 1564 int sock_create(int family, int type, int protocol, struct socket **res) 1565 { 1566 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1567 } 1568 EXPORT_SYMBOL(sock_create); 1569 1570 /** 1571 * sock_create_kern - creates a socket (kernel space) 1572 * @net: net namespace 1573 * @family: protocol family (AF_INET, ...) 1574 * @type: communication type (SOCK_STREAM, ...) 1575 * @protocol: protocol (0, ...) 1576 * @res: new socket 1577 * 1578 * A wrapper around __sock_create(). 1579 * Returns 0 or an error. This function internally uses GFP_KERNEL. 1580 */ 1581 1582 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1583 { 1584 return __sock_create(net, family, type, protocol, res, 1); 1585 } 1586 EXPORT_SYMBOL(sock_create_kern); 1587 1588 static struct socket *__sys_socket_create(int family, int type, int protocol) 1589 { 1590 struct socket *sock; 1591 int retval; 1592 1593 /* Check the SOCK_* constants for consistency. */ 1594 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1595 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1596 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1597 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1598 1599 if ((type & ~SOCK_TYPE_MASK) & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1600 return ERR_PTR(-EINVAL); 1601 type &= SOCK_TYPE_MASK; 1602 1603 retval = sock_create(family, type, protocol, &sock); 1604 if (retval < 0) 1605 return ERR_PTR(retval); 1606 1607 return sock; 1608 } 1609 1610 struct file *__sys_socket_file(int family, int type, int protocol) 1611 { 1612 struct socket *sock; 1613 struct file *file; 1614 int flags; 1615 1616 sock = __sys_socket_create(family, type, protocol); 1617 if (IS_ERR(sock)) 1618 return ERR_CAST(sock); 1619 1620 flags = type & ~SOCK_TYPE_MASK; 1621 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1622 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1623 1624 file = sock_alloc_file(sock, flags, NULL); 1625 if (IS_ERR(file)) 1626 sock_release(sock); 1627 1628 return file; 1629 } 1630 1631 int __sys_socket(int family, int type, int protocol) 1632 { 1633 struct socket *sock; 1634 int flags; 1635 1636 sock = __sys_socket_create(family, type, protocol); 1637 if (IS_ERR(sock)) 1638 return PTR_ERR(sock); 1639 1640 flags = type & ~SOCK_TYPE_MASK; 1641 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1642 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1643 1644 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1645 } 1646 1647 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1648 { 1649 return __sys_socket(family, type, protocol); 1650 } 1651 1652 /* 1653 * Create a pair of connected sockets. 1654 */ 1655 1656 int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) 1657 { 1658 struct socket *sock1, *sock2; 1659 int fd1, fd2, err; 1660 struct file *newfile1, *newfile2; 1661 int flags; 1662 1663 flags = type & ~SOCK_TYPE_MASK; 1664 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1665 return -EINVAL; 1666 type &= SOCK_TYPE_MASK; 1667 1668 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1669 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1670 1671 /* 1672 * reserve descriptors and make sure we won't fail 1673 * to return them to userland. 1674 */ 1675 fd1 = get_unused_fd_flags(flags); 1676 if (unlikely(fd1 < 0)) 1677 return fd1; 1678 1679 fd2 = get_unused_fd_flags(flags); 1680 if (unlikely(fd2 < 0)) { 1681 put_unused_fd(fd1); 1682 return fd2; 1683 } 1684 1685 err = put_user(fd1, &usockvec[0]); 1686 if (err) 1687 goto out; 1688 1689 err = put_user(fd2, &usockvec[1]); 1690 if (err) 1691 goto out; 1692 1693 /* 1694 * Obtain the first socket and check if the underlying protocol 1695 * supports the socketpair call. 1696 */ 1697 1698 err = sock_create(family, type, protocol, &sock1); 1699 if (unlikely(err < 0)) 1700 goto out; 1701 1702 err = sock_create(family, type, protocol, &sock2); 1703 if (unlikely(err < 0)) { 1704 sock_release(sock1); 1705 goto out; 1706 } 1707 1708 err = security_socket_socketpair(sock1, sock2); 1709 if (unlikely(err)) { 1710 sock_release(sock2); 1711 sock_release(sock1); 1712 goto out; 1713 } 1714 1715 err = sock1->ops->socketpair(sock1, sock2); 1716 if (unlikely(err < 0)) { 1717 sock_release(sock2); 1718 sock_release(sock1); 1719 goto out; 1720 } 1721 1722 newfile1 = sock_alloc_file(sock1, flags, NULL); 1723 if (IS_ERR(newfile1)) { 1724 err = PTR_ERR(newfile1); 1725 sock_release(sock2); 1726 goto out; 1727 } 1728 1729 newfile2 = sock_alloc_file(sock2, flags, NULL); 1730 if (IS_ERR(newfile2)) { 1731 err = PTR_ERR(newfile2); 1732 fput(newfile1); 1733 goto out; 1734 } 1735 1736 audit_fd_pair(fd1, fd2); 1737 1738 fd_install(fd1, newfile1); 1739 fd_install(fd2, newfile2); 1740 return 0; 1741 1742 out: 1743 put_unused_fd(fd2); 1744 put_unused_fd(fd1); 1745 return err; 1746 } 1747 1748 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1749 int __user *, usockvec) 1750 { 1751 return __sys_socketpair(family, type, protocol, usockvec); 1752 } 1753 1754 /* 1755 * Bind a name to a socket. Nothing much to do here since it's 1756 * the protocol's responsibility to handle the local address. 1757 * 1758 * We move the socket address to kernel space before we call 1759 * the protocol layer (having also checked the address is ok). 1760 */ 1761 1762 int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 1763 { 1764 struct socket *sock; 1765 struct sockaddr_storage address; 1766 int err, fput_needed; 1767 1768 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1769 if (sock) { 1770 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1771 if (!err) { 1772 err = security_socket_bind(sock, 1773 (struct sockaddr *)&address, 1774 addrlen); 1775 if (!err) 1776 err = sock->ops->bind(sock, 1777 (struct sockaddr *) 1778 &address, addrlen); 1779 } 1780 fput_light(sock->file, fput_needed); 1781 } 1782 return err; 1783 } 1784 1785 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1786 { 1787 return __sys_bind(fd, umyaddr, addrlen); 1788 } 1789 1790 /* 1791 * Perform a listen. Basically, we allow the protocol to do anything 1792 * necessary for a listen, and if that works, we mark the socket as 1793 * ready for listening. 1794 */ 1795 1796 int __sys_listen(int fd, int backlog) 1797 { 1798 struct socket *sock; 1799 int err, fput_needed; 1800 int somaxconn; 1801 1802 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1803 if (sock) { 1804 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1805 if ((unsigned int)backlog > somaxconn) 1806 backlog = somaxconn; 1807 1808 err = security_socket_listen(sock, backlog); 1809 if (!err) 1810 err = sock->ops->listen(sock, backlog); 1811 1812 fput_light(sock->file, fput_needed); 1813 } 1814 return err; 1815 } 1816 1817 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1818 { 1819 return __sys_listen(fd, backlog); 1820 } 1821 1822 struct file *do_accept(struct file *file, unsigned file_flags, 1823 struct sockaddr __user *upeer_sockaddr, 1824 int __user *upeer_addrlen, int flags) 1825 { 1826 struct socket *sock, *newsock; 1827 struct file *newfile; 1828 int err, len; 1829 struct sockaddr_storage address; 1830 1831 sock = sock_from_file(file); 1832 if (!sock) 1833 return ERR_PTR(-ENOTSOCK); 1834 1835 newsock = sock_alloc(); 1836 if (!newsock) 1837 return ERR_PTR(-ENFILE); 1838 1839 newsock->type = sock->type; 1840 newsock->ops = sock->ops; 1841 1842 /* 1843 * We don't need try_module_get here, as the listening socket (sock) 1844 * has the protocol module (sock->ops->owner) held. 1845 */ 1846 __module_get(newsock->ops->owner); 1847 1848 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1849 if (IS_ERR(newfile)) 1850 return newfile; 1851 1852 err = security_socket_accept(sock, newsock); 1853 if (err) 1854 goto out_fd; 1855 1856 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, 1857 false); 1858 if (err < 0) 1859 goto out_fd; 1860 1861 if (upeer_sockaddr) { 1862 len = newsock->ops->getname(newsock, 1863 (struct sockaddr *)&address, 2); 1864 if (len < 0) { 1865 err = -ECONNABORTED; 1866 goto out_fd; 1867 } 1868 err = move_addr_to_user(&address, 1869 len, upeer_sockaddr, upeer_addrlen); 1870 if (err < 0) 1871 goto out_fd; 1872 } 1873 1874 /* File flags are not inherited via accept() unlike another OSes. */ 1875 return newfile; 1876 out_fd: 1877 fput(newfile); 1878 return ERR_PTR(err); 1879 } 1880 1881 static int __sys_accept4_file(struct file *file, struct sockaddr __user *upeer_sockaddr, 1882 int __user *upeer_addrlen, int flags) 1883 { 1884 struct file *newfile; 1885 int newfd; 1886 1887 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1888 return -EINVAL; 1889 1890 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1891 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1892 1893 newfd = get_unused_fd_flags(flags); 1894 if (unlikely(newfd < 0)) 1895 return newfd; 1896 1897 newfile = do_accept(file, 0, upeer_sockaddr, upeer_addrlen, 1898 flags); 1899 if (IS_ERR(newfile)) { 1900 put_unused_fd(newfd); 1901 return PTR_ERR(newfile); 1902 } 1903 fd_install(newfd, newfile); 1904 return newfd; 1905 } 1906 1907 /* 1908 * For accept, we attempt to create a new socket, set up the link 1909 * with the client, wake up the client, then return the new 1910 * connected fd. We collect the address of the connector in kernel 1911 * space and move it to user at the very end. This is unclean because 1912 * we open the socket then return an error. 1913 * 1914 * 1003.1g adds the ability to recvmsg() to query connection pending 1915 * status to recvmsg. We need to add that support in a way thats 1916 * clean when we restructure accept also. 1917 */ 1918 1919 int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 1920 int __user *upeer_addrlen, int flags) 1921 { 1922 int ret = -EBADF; 1923 struct fd f; 1924 1925 f = fdget(fd); 1926 if (f.file) { 1927 ret = __sys_accept4_file(f.file, upeer_sockaddr, 1928 upeer_addrlen, flags); 1929 fdput(f); 1930 } 1931 1932 return ret; 1933 } 1934 1935 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1936 int __user *, upeer_addrlen, int, flags) 1937 { 1938 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); 1939 } 1940 1941 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1942 int __user *, upeer_addrlen) 1943 { 1944 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1945 } 1946 1947 /* 1948 * Attempt to connect to a socket with the server address. The address 1949 * is in user space so we verify it is OK and move it to kernel space. 1950 * 1951 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1952 * break bindings 1953 * 1954 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1955 * other SEQPACKET protocols that take time to connect() as it doesn't 1956 * include the -EINPROGRESS status for such sockets. 1957 */ 1958 1959 int __sys_connect_file(struct file *file, struct sockaddr_storage *address, 1960 int addrlen, int file_flags) 1961 { 1962 struct socket *sock; 1963 int err; 1964 1965 sock = sock_from_file(file); 1966 if (!sock) { 1967 err = -ENOTSOCK; 1968 goto out; 1969 } 1970 1971 err = 1972 security_socket_connect(sock, (struct sockaddr *)address, addrlen); 1973 if (err) 1974 goto out; 1975 1976 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, 1977 sock->file->f_flags | file_flags); 1978 out: 1979 return err; 1980 } 1981 1982 int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 1983 { 1984 int ret = -EBADF; 1985 struct fd f; 1986 1987 f = fdget(fd); 1988 if (f.file) { 1989 struct sockaddr_storage address; 1990 1991 ret = move_addr_to_kernel(uservaddr, addrlen, &address); 1992 if (!ret) 1993 ret = __sys_connect_file(f.file, &address, addrlen, 0); 1994 fdput(f); 1995 } 1996 1997 return ret; 1998 } 1999 2000 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 2001 int, addrlen) 2002 { 2003 return __sys_connect(fd, uservaddr, addrlen); 2004 } 2005 2006 /* 2007 * Get the local address ('name') of a socket object. Move the obtained 2008 * name to user space. 2009 */ 2010 2011 int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, 2012 int __user *usockaddr_len) 2013 { 2014 struct socket *sock; 2015 struct sockaddr_storage address; 2016 int err, fput_needed; 2017 2018 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2019 if (!sock) 2020 goto out; 2021 2022 err = security_socket_getsockname(sock); 2023 if (err) 2024 goto out_put; 2025 2026 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); 2027 if (err < 0) 2028 goto out_put; 2029 /* "err" is actually length in this case */ 2030 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); 2031 2032 out_put: 2033 fput_light(sock->file, fput_needed); 2034 out: 2035 return err; 2036 } 2037 2038 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 2039 int __user *, usockaddr_len) 2040 { 2041 return __sys_getsockname(fd, usockaddr, usockaddr_len); 2042 } 2043 2044 /* 2045 * Get the remote address ('name') of a socket object. Move the obtained 2046 * name to user space. 2047 */ 2048 2049 int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, 2050 int __user *usockaddr_len) 2051 { 2052 struct socket *sock; 2053 struct sockaddr_storage address; 2054 int err, fput_needed; 2055 2056 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2057 if (sock != NULL) { 2058 err = security_socket_getpeername(sock); 2059 if (err) { 2060 fput_light(sock->file, fput_needed); 2061 return err; 2062 } 2063 2064 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); 2065 if (err >= 0) 2066 /* "err" is actually length in this case */ 2067 err = move_addr_to_user(&address, err, usockaddr, 2068 usockaddr_len); 2069 fput_light(sock->file, fput_needed); 2070 } 2071 return err; 2072 } 2073 2074 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 2075 int __user *, usockaddr_len) 2076 { 2077 return __sys_getpeername(fd, usockaddr, usockaddr_len); 2078 } 2079 2080 /* 2081 * Send a datagram to a given address. We move the address into kernel 2082 * space and check the user space data area is readable before invoking 2083 * the protocol. 2084 */ 2085 int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, 2086 struct sockaddr __user *addr, int addr_len) 2087 { 2088 struct socket *sock; 2089 struct sockaddr_storage address; 2090 int err; 2091 struct msghdr msg; 2092 struct iovec iov; 2093 int fput_needed; 2094 2095 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 2096 if (unlikely(err)) 2097 return err; 2098 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2099 if (!sock) 2100 goto out; 2101 2102 msg.msg_name = NULL; 2103 msg.msg_control = NULL; 2104 msg.msg_controllen = 0; 2105 msg.msg_namelen = 0; 2106 if (addr) { 2107 err = move_addr_to_kernel(addr, addr_len, &address); 2108 if (err < 0) 2109 goto out_put; 2110 msg.msg_name = (struct sockaddr *)&address; 2111 msg.msg_namelen = addr_len; 2112 } 2113 if (sock->file->f_flags & O_NONBLOCK) 2114 flags |= MSG_DONTWAIT; 2115 msg.msg_flags = flags; 2116 err = sock_sendmsg(sock, &msg); 2117 2118 out_put: 2119 fput_light(sock->file, fput_needed); 2120 out: 2121 return err; 2122 } 2123 2124 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 2125 unsigned int, flags, struct sockaddr __user *, addr, 2126 int, addr_len) 2127 { 2128 return __sys_sendto(fd, buff, len, flags, addr, addr_len); 2129 } 2130 2131 /* 2132 * Send a datagram down a socket. 2133 */ 2134 2135 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 2136 unsigned int, flags) 2137 { 2138 return __sys_sendto(fd, buff, len, flags, NULL, 0); 2139 } 2140 2141 /* 2142 * Receive a frame from the socket and optionally record the address of the 2143 * sender. We verify the buffers are writable and if needed move the 2144 * sender address from kernel to user space. 2145 */ 2146 int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, 2147 struct sockaddr __user *addr, int __user *addr_len) 2148 { 2149 struct socket *sock; 2150 struct iovec iov; 2151 struct msghdr msg; 2152 struct sockaddr_storage address; 2153 int err, err2; 2154 int fput_needed; 2155 2156 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 2157 if (unlikely(err)) 2158 return err; 2159 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2160 if (!sock) 2161 goto out; 2162 2163 msg.msg_control = NULL; 2164 msg.msg_controllen = 0; 2165 /* Save some cycles and don't copy the address if not needed */ 2166 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 2167 /* We assume all kernel code knows the size of sockaddr_storage */ 2168 msg.msg_namelen = 0; 2169 msg.msg_iocb = NULL; 2170 msg.msg_flags = 0; 2171 if (sock->file->f_flags & O_NONBLOCK) 2172 flags |= MSG_DONTWAIT; 2173 err = sock_recvmsg(sock, &msg, flags); 2174 2175 if (err >= 0 && addr != NULL) { 2176 err2 = move_addr_to_user(&address, 2177 msg.msg_namelen, addr, addr_len); 2178 if (err2 < 0) 2179 err = err2; 2180 } 2181 2182 fput_light(sock->file, fput_needed); 2183 out: 2184 return err; 2185 } 2186 2187 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 2188 unsigned int, flags, struct sockaddr __user *, addr, 2189 int __user *, addr_len) 2190 { 2191 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); 2192 } 2193 2194 /* 2195 * Receive a datagram from a socket. 2196 */ 2197 2198 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 2199 unsigned int, flags) 2200 { 2201 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 2202 } 2203 2204 static bool sock_use_custom_sol_socket(const struct socket *sock) 2205 { 2206 const struct sock *sk = sock->sk; 2207 2208 /* Use sock->ops->setsockopt() for MPTCP */ 2209 return IS_ENABLED(CONFIG_MPTCP) && 2210 sk->sk_protocol == IPPROTO_MPTCP && 2211 sk->sk_type == SOCK_STREAM && 2212 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6); 2213 } 2214 2215 /* 2216 * Set a socket option. Because we don't know the option lengths we have 2217 * to pass the user mode parameter for the protocols to sort out. 2218 */ 2219 int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, 2220 int optlen) 2221 { 2222 sockptr_t optval = USER_SOCKPTR(user_optval); 2223 char *kernel_optval = NULL; 2224 int err, fput_needed; 2225 struct socket *sock; 2226 2227 if (optlen < 0) 2228 return -EINVAL; 2229 2230 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2231 if (!sock) 2232 return err; 2233 2234 err = security_socket_setsockopt(sock, level, optname); 2235 if (err) 2236 goto out_put; 2237 2238 if (!in_compat_syscall()) 2239 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, 2240 user_optval, &optlen, 2241 &kernel_optval); 2242 if (err < 0) 2243 goto out_put; 2244 if (err > 0) { 2245 err = 0; 2246 goto out_put; 2247 } 2248 2249 if (kernel_optval) 2250 optval = KERNEL_SOCKPTR(kernel_optval); 2251 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) 2252 err = sock_setsockopt(sock, level, optname, optval, optlen); 2253 else if (unlikely(!sock->ops->setsockopt)) 2254 err = -EOPNOTSUPP; 2255 else 2256 err = sock->ops->setsockopt(sock, level, optname, optval, 2257 optlen); 2258 kfree(kernel_optval); 2259 out_put: 2260 fput_light(sock->file, fput_needed); 2261 return err; 2262 } 2263 2264 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 2265 char __user *, optval, int, optlen) 2266 { 2267 return __sys_setsockopt(fd, level, optname, optval, optlen); 2268 } 2269 2270 INDIRECT_CALLABLE_DECLARE(bool tcp_bpf_bypass_getsockopt(int level, 2271 int optname)); 2272 2273 /* 2274 * Get a socket option. Because we don't know the option lengths we have 2275 * to pass a user mode parameter for the protocols to sort out. 2276 */ 2277 int __sys_getsockopt(int fd, int level, int optname, char __user *optval, 2278 int __user *optlen) 2279 { 2280 int err, fput_needed; 2281 struct socket *sock; 2282 int max_optlen; 2283 2284 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2285 if (!sock) 2286 return err; 2287 2288 err = security_socket_getsockopt(sock, level, optname); 2289 if (err) 2290 goto out_put; 2291 2292 if (!in_compat_syscall()) 2293 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); 2294 2295 if (level == SOL_SOCKET) 2296 err = sock_getsockopt(sock, level, optname, optval, optlen); 2297 else if (unlikely(!sock->ops->getsockopt)) 2298 err = -EOPNOTSUPP; 2299 else 2300 err = sock->ops->getsockopt(sock, level, optname, optval, 2301 optlen); 2302 2303 if (!in_compat_syscall()) 2304 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, 2305 optval, optlen, max_optlen, 2306 err); 2307 out_put: 2308 fput_light(sock->file, fput_needed); 2309 return err; 2310 } 2311 2312 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 2313 char __user *, optval, int __user *, optlen) 2314 { 2315 return __sys_getsockopt(fd, level, optname, optval, optlen); 2316 } 2317 2318 /* 2319 * Shutdown a socket. 2320 */ 2321 2322 int __sys_shutdown_sock(struct socket *sock, int how) 2323 { 2324 int err; 2325 2326 err = security_socket_shutdown(sock, how); 2327 if (!err) 2328 err = sock->ops->shutdown(sock, how); 2329 2330 return err; 2331 } 2332 2333 int __sys_shutdown(int fd, int how) 2334 { 2335 int err, fput_needed; 2336 struct socket *sock; 2337 2338 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2339 if (sock != NULL) { 2340 err = __sys_shutdown_sock(sock, how); 2341 fput_light(sock->file, fput_needed); 2342 } 2343 return err; 2344 } 2345 2346 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 2347 { 2348 return __sys_shutdown(fd, how); 2349 } 2350 2351 /* A couple of helpful macros for getting the address of the 32/64 bit 2352 * fields which are the same type (int / unsigned) on our platforms. 2353 */ 2354 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 2355 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 2356 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 2357 2358 struct used_address { 2359 struct sockaddr_storage name; 2360 unsigned int name_len; 2361 }; 2362 2363 int __copy_msghdr_from_user(struct msghdr *kmsg, 2364 struct user_msghdr __user *umsg, 2365 struct sockaddr __user **save_addr, 2366 struct iovec __user **uiov, size_t *nsegs) 2367 { 2368 struct user_msghdr msg; 2369 ssize_t err; 2370 2371 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 2372 return -EFAULT; 2373 2374 kmsg->msg_control_is_user = true; 2375 kmsg->msg_control_user = msg.msg_control; 2376 kmsg->msg_controllen = msg.msg_controllen; 2377 kmsg->msg_flags = msg.msg_flags; 2378 2379 kmsg->msg_namelen = msg.msg_namelen; 2380 if (!msg.msg_name) 2381 kmsg->msg_namelen = 0; 2382 2383 if (kmsg->msg_namelen < 0) 2384 return -EINVAL; 2385 2386 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 2387 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 2388 2389 if (save_addr) 2390 *save_addr = msg.msg_name; 2391 2392 if (msg.msg_name && kmsg->msg_namelen) { 2393 if (!save_addr) { 2394 err = move_addr_to_kernel(msg.msg_name, 2395 kmsg->msg_namelen, 2396 kmsg->msg_name); 2397 if (err < 0) 2398 return err; 2399 } 2400 } else { 2401 kmsg->msg_name = NULL; 2402 kmsg->msg_namelen = 0; 2403 } 2404 2405 if (msg.msg_iovlen > UIO_MAXIOV) 2406 return -EMSGSIZE; 2407 2408 kmsg->msg_iocb = NULL; 2409 *uiov = msg.msg_iov; 2410 *nsegs = msg.msg_iovlen; 2411 return 0; 2412 } 2413 2414 static int copy_msghdr_from_user(struct msghdr *kmsg, 2415 struct user_msghdr __user *umsg, 2416 struct sockaddr __user **save_addr, 2417 struct iovec **iov) 2418 { 2419 struct user_msghdr msg; 2420 ssize_t err; 2421 2422 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, 2423 &msg.msg_iovlen); 2424 if (err) 2425 return err; 2426 2427 err = import_iovec(save_addr ? READ : WRITE, 2428 msg.msg_iov, msg.msg_iovlen, 2429 UIO_FASTIOV, iov, &kmsg->msg_iter); 2430 return err < 0 ? err : 0; 2431 } 2432 2433 static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, 2434 unsigned int flags, struct used_address *used_address, 2435 unsigned int allowed_msghdr_flags) 2436 { 2437 unsigned char ctl[sizeof(struct cmsghdr) + 20] 2438 __aligned(sizeof(__kernel_size_t)); 2439 /* 20 is size of ipv6_pktinfo */ 2440 unsigned char *ctl_buf = ctl; 2441 int ctl_len; 2442 ssize_t err; 2443 2444 err = -ENOBUFS; 2445 2446 if (msg_sys->msg_controllen > INT_MAX) 2447 goto out; 2448 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 2449 ctl_len = msg_sys->msg_controllen; 2450 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2451 err = 2452 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2453 sizeof(ctl)); 2454 if (err) 2455 goto out; 2456 ctl_buf = msg_sys->msg_control; 2457 ctl_len = msg_sys->msg_controllen; 2458 } else if (ctl_len) { 2459 BUILD_BUG_ON(sizeof(struct cmsghdr) != 2460 CMSG_ALIGN(sizeof(struct cmsghdr))); 2461 if (ctl_len > sizeof(ctl)) { 2462 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2463 if (ctl_buf == NULL) 2464 goto out; 2465 } 2466 err = -EFAULT; 2467 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) 2468 goto out_freectl; 2469 msg_sys->msg_control = ctl_buf; 2470 msg_sys->msg_control_is_user = false; 2471 } 2472 msg_sys->msg_flags = flags; 2473 2474 if (sock->file->f_flags & O_NONBLOCK) 2475 msg_sys->msg_flags |= MSG_DONTWAIT; 2476 /* 2477 * If this is sendmmsg() and current destination address is same as 2478 * previously succeeded address, omit asking LSM's decision. 2479 * used_address->name_len is initialized to UINT_MAX so that the first 2480 * destination address never matches. 2481 */ 2482 if (used_address && msg_sys->msg_name && 2483 used_address->name_len == msg_sys->msg_namelen && 2484 !memcmp(&used_address->name, msg_sys->msg_name, 2485 used_address->name_len)) { 2486 err = sock_sendmsg_nosec(sock, msg_sys); 2487 goto out_freectl; 2488 } 2489 err = sock_sendmsg(sock, msg_sys); 2490 /* 2491 * If this is sendmmsg() and sending to current destination address was 2492 * successful, remember it. 2493 */ 2494 if (used_address && err >= 0) { 2495 used_address->name_len = msg_sys->msg_namelen; 2496 if (msg_sys->msg_name) 2497 memcpy(&used_address->name, msg_sys->msg_name, 2498 used_address->name_len); 2499 } 2500 2501 out_freectl: 2502 if (ctl_buf != ctl) 2503 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2504 out: 2505 return err; 2506 } 2507 2508 int sendmsg_copy_msghdr(struct msghdr *msg, 2509 struct user_msghdr __user *umsg, unsigned flags, 2510 struct iovec **iov) 2511 { 2512 int err; 2513 2514 if (flags & MSG_CMSG_COMPAT) { 2515 struct compat_msghdr __user *msg_compat; 2516 2517 msg_compat = (struct compat_msghdr __user *) umsg; 2518 err = get_compat_msghdr(msg, msg_compat, NULL, iov); 2519 } else { 2520 err = copy_msghdr_from_user(msg, umsg, NULL, iov); 2521 } 2522 if (err < 0) 2523 return err; 2524 2525 return 0; 2526 } 2527 2528 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 2529 struct msghdr *msg_sys, unsigned int flags, 2530 struct used_address *used_address, 2531 unsigned int allowed_msghdr_flags) 2532 { 2533 struct sockaddr_storage address; 2534 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2535 ssize_t err; 2536 2537 msg_sys->msg_name = &address; 2538 2539 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); 2540 if (err < 0) 2541 return err; 2542 2543 err = ____sys_sendmsg(sock, msg_sys, flags, used_address, 2544 allowed_msghdr_flags); 2545 kfree(iov); 2546 return err; 2547 } 2548 2549 /* 2550 * BSD sendmsg interface 2551 */ 2552 long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, 2553 unsigned int flags) 2554 { 2555 return ____sys_sendmsg(sock, msg, flags, NULL, 0); 2556 } 2557 2558 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2559 bool forbid_cmsg_compat) 2560 { 2561 int fput_needed, err; 2562 struct msghdr msg_sys; 2563 struct socket *sock; 2564 2565 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2566 return -EINVAL; 2567 2568 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2569 if (!sock) 2570 goto out; 2571 2572 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2573 2574 fput_light(sock->file, fput_needed); 2575 out: 2576 return err; 2577 } 2578 2579 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2580 { 2581 return __sys_sendmsg(fd, msg, flags, true); 2582 } 2583 2584 /* 2585 * Linux sendmmsg interface 2586 */ 2587 2588 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2589 unsigned int flags, bool forbid_cmsg_compat) 2590 { 2591 int fput_needed, err, datagrams; 2592 struct socket *sock; 2593 struct mmsghdr __user *entry; 2594 struct compat_mmsghdr __user *compat_entry; 2595 struct msghdr msg_sys; 2596 struct used_address used_address; 2597 unsigned int oflags = flags; 2598 2599 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2600 return -EINVAL; 2601 2602 if (vlen > UIO_MAXIOV) 2603 vlen = UIO_MAXIOV; 2604 2605 datagrams = 0; 2606 2607 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2608 if (!sock) 2609 return err; 2610 2611 used_address.name_len = UINT_MAX; 2612 entry = mmsg; 2613 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2614 err = 0; 2615 flags |= MSG_BATCH; 2616 2617 while (datagrams < vlen) { 2618 if (datagrams == vlen - 1) 2619 flags = oflags; 2620 2621 if (MSG_CMSG_COMPAT & flags) { 2622 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2623 &msg_sys, flags, &used_address, MSG_EOR); 2624 if (err < 0) 2625 break; 2626 err = __put_user(err, &compat_entry->msg_len); 2627 ++compat_entry; 2628 } else { 2629 err = ___sys_sendmsg(sock, 2630 (struct user_msghdr __user *)entry, 2631 &msg_sys, flags, &used_address, MSG_EOR); 2632 if (err < 0) 2633 break; 2634 err = put_user(err, &entry->msg_len); 2635 ++entry; 2636 } 2637 2638 if (err) 2639 break; 2640 ++datagrams; 2641 if (msg_data_left(&msg_sys)) 2642 break; 2643 cond_resched(); 2644 } 2645 2646 fput_light(sock->file, fput_needed); 2647 2648 /* We only return an error if no datagrams were able to be sent */ 2649 if (datagrams != 0) 2650 return datagrams; 2651 2652 return err; 2653 } 2654 2655 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2656 unsigned int, vlen, unsigned int, flags) 2657 { 2658 return __sys_sendmmsg(fd, mmsg, vlen, flags, true); 2659 } 2660 2661 int recvmsg_copy_msghdr(struct msghdr *msg, 2662 struct user_msghdr __user *umsg, unsigned flags, 2663 struct sockaddr __user **uaddr, 2664 struct iovec **iov) 2665 { 2666 ssize_t err; 2667 2668 if (MSG_CMSG_COMPAT & flags) { 2669 struct compat_msghdr __user *msg_compat; 2670 2671 msg_compat = (struct compat_msghdr __user *) umsg; 2672 err = get_compat_msghdr(msg, msg_compat, uaddr, iov); 2673 } else { 2674 err = copy_msghdr_from_user(msg, umsg, uaddr, iov); 2675 } 2676 if (err < 0) 2677 return err; 2678 2679 return 0; 2680 } 2681 2682 static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, 2683 struct user_msghdr __user *msg, 2684 struct sockaddr __user *uaddr, 2685 unsigned int flags, int nosec) 2686 { 2687 struct compat_msghdr __user *msg_compat = 2688 (struct compat_msghdr __user *) msg; 2689 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2690 struct sockaddr_storage addr; 2691 unsigned long cmsg_ptr; 2692 int len; 2693 ssize_t err; 2694 2695 msg_sys->msg_name = &addr; 2696 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2697 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2698 2699 /* We assume all kernel code knows the size of sockaddr_storage */ 2700 msg_sys->msg_namelen = 0; 2701 2702 if (sock->file->f_flags & O_NONBLOCK) 2703 flags |= MSG_DONTWAIT; 2704 2705 if (unlikely(nosec)) 2706 err = sock_recvmsg_nosec(sock, msg_sys, flags); 2707 else 2708 err = sock_recvmsg(sock, msg_sys, flags); 2709 2710 if (err < 0) 2711 goto out; 2712 len = err; 2713 2714 if (uaddr != NULL) { 2715 err = move_addr_to_user(&addr, 2716 msg_sys->msg_namelen, uaddr, 2717 uaddr_len); 2718 if (err < 0) 2719 goto out; 2720 } 2721 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2722 COMPAT_FLAGS(msg)); 2723 if (err) 2724 goto out; 2725 if (MSG_CMSG_COMPAT & flags) 2726 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2727 &msg_compat->msg_controllen); 2728 else 2729 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2730 &msg->msg_controllen); 2731 if (err) 2732 goto out; 2733 err = len; 2734 out: 2735 return err; 2736 } 2737 2738 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2739 struct msghdr *msg_sys, unsigned int flags, int nosec) 2740 { 2741 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2742 /* user mode address pointers */ 2743 struct sockaddr __user *uaddr; 2744 ssize_t err; 2745 2746 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); 2747 if (err < 0) 2748 return err; 2749 2750 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); 2751 kfree(iov); 2752 return err; 2753 } 2754 2755 /* 2756 * BSD recvmsg interface 2757 */ 2758 2759 long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, 2760 struct user_msghdr __user *umsg, 2761 struct sockaddr __user *uaddr, unsigned int flags) 2762 { 2763 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); 2764 } 2765 2766 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2767 bool forbid_cmsg_compat) 2768 { 2769 int fput_needed, err; 2770 struct msghdr msg_sys; 2771 struct socket *sock; 2772 2773 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2774 return -EINVAL; 2775 2776 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2777 if (!sock) 2778 goto out; 2779 2780 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2781 2782 fput_light(sock->file, fput_needed); 2783 out: 2784 return err; 2785 } 2786 2787 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2788 unsigned int, flags) 2789 { 2790 return __sys_recvmsg(fd, msg, flags, true); 2791 } 2792 2793 /* 2794 * Linux recvmmsg interface 2795 */ 2796 2797 static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2798 unsigned int vlen, unsigned int flags, 2799 struct timespec64 *timeout) 2800 { 2801 int fput_needed, err, datagrams; 2802 struct socket *sock; 2803 struct mmsghdr __user *entry; 2804 struct compat_mmsghdr __user *compat_entry; 2805 struct msghdr msg_sys; 2806 struct timespec64 end_time; 2807 struct timespec64 timeout64; 2808 2809 if (timeout && 2810 poll_select_set_timeout(&end_time, timeout->tv_sec, 2811 timeout->tv_nsec)) 2812 return -EINVAL; 2813 2814 datagrams = 0; 2815 2816 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2817 if (!sock) 2818 return err; 2819 2820 if (likely(!(flags & MSG_ERRQUEUE))) { 2821 err = sock_error(sock->sk); 2822 if (err) { 2823 datagrams = err; 2824 goto out_put; 2825 } 2826 } 2827 2828 entry = mmsg; 2829 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2830 2831 while (datagrams < vlen) { 2832 /* 2833 * No need to ask LSM for more than the first datagram. 2834 */ 2835 if (MSG_CMSG_COMPAT & flags) { 2836 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2837 &msg_sys, flags & ~MSG_WAITFORONE, 2838 datagrams); 2839 if (err < 0) 2840 break; 2841 err = __put_user(err, &compat_entry->msg_len); 2842 ++compat_entry; 2843 } else { 2844 err = ___sys_recvmsg(sock, 2845 (struct user_msghdr __user *)entry, 2846 &msg_sys, flags & ~MSG_WAITFORONE, 2847 datagrams); 2848 if (err < 0) 2849 break; 2850 err = put_user(err, &entry->msg_len); 2851 ++entry; 2852 } 2853 2854 if (err) 2855 break; 2856 ++datagrams; 2857 2858 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2859 if (flags & MSG_WAITFORONE) 2860 flags |= MSG_DONTWAIT; 2861 2862 if (timeout) { 2863 ktime_get_ts64(&timeout64); 2864 *timeout = timespec64_sub(end_time, timeout64); 2865 if (timeout->tv_sec < 0) { 2866 timeout->tv_sec = timeout->tv_nsec = 0; 2867 break; 2868 } 2869 2870 /* Timeout, return less than vlen datagrams */ 2871 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2872 break; 2873 } 2874 2875 /* Out of band data, return right away */ 2876 if (msg_sys.msg_flags & MSG_OOB) 2877 break; 2878 cond_resched(); 2879 } 2880 2881 if (err == 0) 2882 goto out_put; 2883 2884 if (datagrams == 0) { 2885 datagrams = err; 2886 goto out_put; 2887 } 2888 2889 /* 2890 * We may return less entries than requested (vlen) if the 2891 * sock is non block and there aren't enough datagrams... 2892 */ 2893 if (err != -EAGAIN) { 2894 /* 2895 * ... or if recvmsg returns an error after we 2896 * received some datagrams, where we record the 2897 * error to return on the next call or if the 2898 * app asks about it using getsockopt(SO_ERROR). 2899 */ 2900 sock->sk->sk_err = -err; 2901 } 2902 out_put: 2903 fput_light(sock->file, fput_needed); 2904 2905 return datagrams; 2906 } 2907 2908 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2909 unsigned int vlen, unsigned int flags, 2910 struct __kernel_timespec __user *timeout, 2911 struct old_timespec32 __user *timeout32) 2912 { 2913 int datagrams; 2914 struct timespec64 timeout_sys; 2915 2916 if (timeout && get_timespec64(&timeout_sys, timeout)) 2917 return -EFAULT; 2918 2919 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) 2920 return -EFAULT; 2921 2922 if (!timeout && !timeout32) 2923 return do_recvmmsg(fd, mmsg, vlen, flags, NULL); 2924 2925 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2926 2927 if (datagrams <= 0) 2928 return datagrams; 2929 2930 if (timeout && put_timespec64(&timeout_sys, timeout)) 2931 datagrams = -EFAULT; 2932 2933 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) 2934 datagrams = -EFAULT; 2935 2936 return datagrams; 2937 } 2938 2939 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2940 unsigned int, vlen, unsigned int, flags, 2941 struct __kernel_timespec __user *, timeout) 2942 { 2943 if (flags & MSG_CMSG_COMPAT) 2944 return -EINVAL; 2945 2946 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); 2947 } 2948 2949 #ifdef CONFIG_COMPAT_32BIT_TIME 2950 SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, 2951 unsigned int, vlen, unsigned int, flags, 2952 struct old_timespec32 __user *, timeout) 2953 { 2954 if (flags & MSG_CMSG_COMPAT) 2955 return -EINVAL; 2956 2957 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); 2958 } 2959 #endif 2960 2961 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2962 /* Argument list sizes for sys_socketcall */ 2963 #define AL(x) ((x) * sizeof(unsigned long)) 2964 static const unsigned char nargs[21] = { 2965 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2966 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2967 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2968 AL(4), AL(5), AL(4) 2969 }; 2970 2971 #undef AL 2972 2973 /* 2974 * System call vectors. 2975 * 2976 * Argument checking cleaned up. Saved 20% in size. 2977 * This function doesn't need to set the kernel lock because 2978 * it is set by the callees. 2979 */ 2980 2981 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2982 { 2983 unsigned long a[AUDITSC_ARGS]; 2984 unsigned long a0, a1; 2985 int err; 2986 unsigned int len; 2987 2988 if (call < 1 || call > SYS_SENDMMSG) 2989 return -EINVAL; 2990 call = array_index_nospec(call, SYS_SENDMMSG + 1); 2991 2992 len = nargs[call]; 2993 if (len > sizeof(a)) 2994 return -EINVAL; 2995 2996 /* copy_from_user should be SMP safe. */ 2997 if (copy_from_user(a, args, len)) 2998 return -EFAULT; 2999 3000 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 3001 if (err) 3002 return err; 3003 3004 a0 = a[0]; 3005 a1 = a[1]; 3006 3007 switch (call) { 3008 case SYS_SOCKET: 3009 err = __sys_socket(a0, a1, a[2]); 3010 break; 3011 case SYS_BIND: 3012 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 3013 break; 3014 case SYS_CONNECT: 3015 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 3016 break; 3017 case SYS_LISTEN: 3018 err = __sys_listen(a0, a1); 3019 break; 3020 case SYS_ACCEPT: 3021 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 3022 (int __user *)a[2], 0); 3023 break; 3024 case SYS_GETSOCKNAME: 3025 err = 3026 __sys_getsockname(a0, (struct sockaddr __user *)a1, 3027 (int __user *)a[2]); 3028 break; 3029 case SYS_GETPEERNAME: 3030 err = 3031 __sys_getpeername(a0, (struct sockaddr __user *)a1, 3032 (int __user *)a[2]); 3033 break; 3034 case SYS_SOCKETPAIR: 3035 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 3036 break; 3037 case SYS_SEND: 3038 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 3039 NULL, 0); 3040 break; 3041 case SYS_SENDTO: 3042 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 3043 (struct sockaddr __user *)a[4], a[5]); 3044 break; 3045 case SYS_RECV: 3046 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 3047 NULL, NULL); 3048 break; 3049 case SYS_RECVFROM: 3050 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 3051 (struct sockaddr __user *)a[4], 3052 (int __user *)a[5]); 3053 break; 3054 case SYS_SHUTDOWN: 3055 err = __sys_shutdown(a0, a1); 3056 break; 3057 case SYS_SETSOCKOPT: 3058 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], 3059 a[4]); 3060 break; 3061 case SYS_GETSOCKOPT: 3062 err = 3063 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 3064 (int __user *)a[4]); 3065 break; 3066 case SYS_SENDMSG: 3067 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, 3068 a[2], true); 3069 break; 3070 case SYS_SENDMMSG: 3071 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], 3072 a[3], true); 3073 break; 3074 case SYS_RECVMSG: 3075 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, 3076 a[2], true); 3077 break; 3078 case SYS_RECVMMSG: 3079 if (IS_ENABLED(CONFIG_64BIT)) 3080 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 3081 a[2], a[3], 3082 (struct __kernel_timespec __user *)a[4], 3083 NULL); 3084 else 3085 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 3086 a[2], a[3], NULL, 3087 (struct old_timespec32 __user *)a[4]); 3088 break; 3089 case SYS_ACCEPT4: 3090 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 3091 (int __user *)a[2], a[3]); 3092 break; 3093 default: 3094 err = -EINVAL; 3095 break; 3096 } 3097 return err; 3098 } 3099 3100 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 3101 3102 /** 3103 * sock_register - add a socket protocol handler 3104 * @ops: description of protocol 3105 * 3106 * This function is called by a protocol handler that wants to 3107 * advertise its address family, and have it linked into the 3108 * socket interface. The value ops->family corresponds to the 3109 * socket system call protocol family. 3110 */ 3111 int sock_register(const struct net_proto_family *ops) 3112 { 3113 int err; 3114 3115 if (ops->family >= NPROTO) { 3116 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 3117 return -ENOBUFS; 3118 } 3119 3120 spin_lock(&net_family_lock); 3121 if (rcu_dereference_protected(net_families[ops->family], 3122 lockdep_is_held(&net_family_lock))) 3123 err = -EEXIST; 3124 else { 3125 rcu_assign_pointer(net_families[ops->family], ops); 3126 err = 0; 3127 } 3128 spin_unlock(&net_family_lock); 3129 3130 pr_info("NET: Registered %s protocol family\n", pf_family_names[ops->family]); 3131 return err; 3132 } 3133 EXPORT_SYMBOL(sock_register); 3134 3135 /** 3136 * sock_unregister - remove a protocol handler 3137 * @family: protocol family to remove 3138 * 3139 * This function is called by a protocol handler that wants to 3140 * remove its address family, and have it unlinked from the 3141 * new socket creation. 3142 * 3143 * If protocol handler is a module, then it can use module reference 3144 * counts to protect against new references. If protocol handler is not 3145 * a module then it needs to provide its own protection in 3146 * the ops->create routine. 3147 */ 3148 void sock_unregister(int family) 3149 { 3150 BUG_ON(family < 0 || family >= NPROTO); 3151 3152 spin_lock(&net_family_lock); 3153 RCU_INIT_POINTER(net_families[family], NULL); 3154 spin_unlock(&net_family_lock); 3155 3156 synchronize_rcu(); 3157 3158 pr_info("NET: Unregistered %s protocol family\n", pf_family_names[family]); 3159 } 3160 EXPORT_SYMBOL(sock_unregister); 3161 3162 bool sock_is_registered(int family) 3163 { 3164 return family < NPROTO && rcu_access_pointer(net_families[family]); 3165 } 3166 3167 static int __init sock_init(void) 3168 { 3169 int err; 3170 /* 3171 * Initialize the network sysctl infrastructure. 3172 */ 3173 err = net_sysctl_init(); 3174 if (err) 3175 goto out; 3176 3177 /* 3178 * Initialize skbuff SLAB cache 3179 */ 3180 skb_init(); 3181 3182 /* 3183 * Initialize the protocols module. 3184 */ 3185 3186 init_inodecache(); 3187 3188 err = register_filesystem(&sock_fs_type); 3189 if (err) 3190 goto out; 3191 sock_mnt = kern_mount(&sock_fs_type); 3192 if (IS_ERR(sock_mnt)) { 3193 err = PTR_ERR(sock_mnt); 3194 goto out_mount; 3195 } 3196 3197 /* The real protocol initialization is performed in later initcalls. 3198 */ 3199 3200 #ifdef CONFIG_NETFILTER 3201 err = netfilter_init(); 3202 if (err) 3203 goto out; 3204 #endif 3205 3206 ptp_classifier_init(); 3207 3208 out: 3209 return err; 3210 3211 out_mount: 3212 unregister_filesystem(&sock_fs_type); 3213 goto out; 3214 } 3215 3216 core_initcall(sock_init); /* early initcall */ 3217 3218 #ifdef CONFIG_PROC_FS 3219 void socket_seq_show(struct seq_file *seq) 3220 { 3221 seq_printf(seq, "sockets: used %d\n", 3222 sock_inuse_get(seq->private)); 3223 } 3224 #endif /* CONFIG_PROC_FS */ 3225 3226 /* Handle the fact that while struct ifreq has the same *layout* on 3227 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, 3228 * which are handled elsewhere, it still has different *size* due to 3229 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, 3230 * resulting in struct ifreq being 32 and 40 bytes respectively). 3231 * As a result, if the struct happens to be at the end of a page and 3232 * the next page isn't readable/writable, we get a fault. To prevent 3233 * that, copy back and forth to the full size. 3234 */ 3235 int get_user_ifreq(struct ifreq *ifr, void __user **ifrdata, void __user *arg) 3236 { 3237 if (in_compat_syscall()) { 3238 struct compat_ifreq *ifr32 = (struct compat_ifreq *)ifr; 3239 3240 memset(ifr, 0, sizeof(*ifr)); 3241 if (copy_from_user(ifr32, arg, sizeof(*ifr32))) 3242 return -EFAULT; 3243 3244 if (ifrdata) 3245 *ifrdata = compat_ptr(ifr32->ifr_data); 3246 3247 return 0; 3248 } 3249 3250 if (copy_from_user(ifr, arg, sizeof(*ifr))) 3251 return -EFAULT; 3252 3253 if (ifrdata) 3254 *ifrdata = ifr->ifr_data; 3255 3256 return 0; 3257 } 3258 EXPORT_SYMBOL(get_user_ifreq); 3259 3260 int put_user_ifreq(struct ifreq *ifr, void __user *arg) 3261 { 3262 size_t size = sizeof(*ifr); 3263 3264 if (in_compat_syscall()) 3265 size = sizeof(struct compat_ifreq); 3266 3267 if (copy_to_user(arg, ifr, size)) 3268 return -EFAULT; 3269 3270 return 0; 3271 } 3272 EXPORT_SYMBOL(put_user_ifreq); 3273 3274 #ifdef CONFIG_COMPAT 3275 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 3276 { 3277 compat_uptr_t uptr32; 3278 struct ifreq ifr; 3279 void __user *saved; 3280 int err; 3281 3282 if (get_user_ifreq(&ifr, NULL, uifr32)) 3283 return -EFAULT; 3284 3285 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 3286 return -EFAULT; 3287 3288 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; 3289 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); 3290 3291 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL, NULL); 3292 if (!err) { 3293 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; 3294 if (put_user_ifreq(&ifr, uifr32)) 3295 err = -EFAULT; 3296 } 3297 return err; 3298 } 3299 3300 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 3301 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 3302 struct compat_ifreq __user *u_ifreq32) 3303 { 3304 struct ifreq ifreq; 3305 void __user *data; 3306 3307 if (!is_socket_ioctl_cmd(cmd)) 3308 return -ENOTTY; 3309 if (get_user_ifreq(&ifreq, &data, u_ifreq32)) 3310 return -EFAULT; 3311 ifreq.ifr_data = data; 3312 3313 return dev_ioctl(net, cmd, &ifreq, data, NULL); 3314 } 3315 3316 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3317 unsigned int cmd, unsigned long arg) 3318 { 3319 void __user *argp = compat_ptr(arg); 3320 struct sock *sk = sock->sk; 3321 struct net *net = sock_net(sk); 3322 3323 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3324 return sock_ioctl(file, cmd, (unsigned long)argp); 3325 3326 switch (cmd) { 3327 case SIOCWANDEV: 3328 return compat_siocwandev(net, argp); 3329 case SIOCGSTAMP_OLD: 3330 case SIOCGSTAMPNS_OLD: 3331 if (!sock->ops->gettstamp) 3332 return -ENOIOCTLCMD; 3333 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, 3334 !COMPAT_USE_64BIT_TIME); 3335 3336 case SIOCETHTOOL: 3337 case SIOCBONDSLAVEINFOQUERY: 3338 case SIOCBONDINFOQUERY: 3339 case SIOCSHWTSTAMP: 3340 case SIOCGHWTSTAMP: 3341 return compat_ifr_data_ioctl(net, cmd, argp); 3342 3343 case FIOSETOWN: 3344 case SIOCSPGRP: 3345 case FIOGETOWN: 3346 case SIOCGPGRP: 3347 case SIOCBRADDBR: 3348 case SIOCBRDELBR: 3349 case SIOCGIFVLAN: 3350 case SIOCSIFVLAN: 3351 case SIOCGSKNS: 3352 case SIOCGSTAMP_NEW: 3353 case SIOCGSTAMPNS_NEW: 3354 case SIOCGIFCONF: 3355 case SIOCSIFBR: 3356 case SIOCGIFBR: 3357 return sock_ioctl(file, cmd, arg); 3358 3359 case SIOCGIFFLAGS: 3360 case SIOCSIFFLAGS: 3361 case SIOCGIFMAP: 3362 case SIOCSIFMAP: 3363 case SIOCGIFMETRIC: 3364 case SIOCSIFMETRIC: 3365 case SIOCGIFMTU: 3366 case SIOCSIFMTU: 3367 case SIOCGIFMEM: 3368 case SIOCSIFMEM: 3369 case SIOCGIFHWADDR: 3370 case SIOCSIFHWADDR: 3371 case SIOCADDMULTI: 3372 case SIOCDELMULTI: 3373 case SIOCGIFINDEX: 3374 case SIOCGIFADDR: 3375 case SIOCSIFADDR: 3376 case SIOCSIFHWBROADCAST: 3377 case SIOCDIFADDR: 3378 case SIOCGIFBRDADDR: 3379 case SIOCSIFBRDADDR: 3380 case SIOCGIFDSTADDR: 3381 case SIOCSIFDSTADDR: 3382 case SIOCGIFNETMASK: 3383 case SIOCSIFNETMASK: 3384 case SIOCSIFPFLAGS: 3385 case SIOCGIFPFLAGS: 3386 case SIOCGIFTXQLEN: 3387 case SIOCSIFTXQLEN: 3388 case SIOCBRADDIF: 3389 case SIOCBRDELIF: 3390 case SIOCGIFNAME: 3391 case SIOCSIFNAME: 3392 case SIOCGMIIPHY: 3393 case SIOCGMIIREG: 3394 case SIOCSMIIREG: 3395 case SIOCBONDENSLAVE: 3396 case SIOCBONDRELEASE: 3397 case SIOCBONDSETHWADDR: 3398 case SIOCBONDCHANGEACTIVE: 3399 case SIOCSARP: 3400 case SIOCGARP: 3401 case SIOCDARP: 3402 case SIOCOUTQ: 3403 case SIOCOUTQNSD: 3404 case SIOCATMARK: 3405 return sock_do_ioctl(net, sock, cmd, arg); 3406 } 3407 3408 return -ENOIOCTLCMD; 3409 } 3410 3411 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3412 unsigned long arg) 3413 { 3414 struct socket *sock = file->private_data; 3415 int ret = -ENOIOCTLCMD; 3416 struct sock *sk; 3417 struct net *net; 3418 3419 sk = sock->sk; 3420 net = sock_net(sk); 3421 3422 if (sock->ops->compat_ioctl) 3423 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3424 3425 if (ret == -ENOIOCTLCMD && 3426 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3427 ret = compat_wext_handle_ioctl(net, cmd, arg); 3428 3429 if (ret == -ENOIOCTLCMD) 3430 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3431 3432 return ret; 3433 } 3434 #endif 3435 3436 /** 3437 * kernel_bind - bind an address to a socket (kernel space) 3438 * @sock: socket 3439 * @addr: address 3440 * @addrlen: length of address 3441 * 3442 * Returns 0 or an error. 3443 */ 3444 3445 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3446 { 3447 return sock->ops->bind(sock, addr, addrlen); 3448 } 3449 EXPORT_SYMBOL(kernel_bind); 3450 3451 /** 3452 * kernel_listen - move socket to listening state (kernel space) 3453 * @sock: socket 3454 * @backlog: pending connections queue size 3455 * 3456 * Returns 0 or an error. 3457 */ 3458 3459 int kernel_listen(struct socket *sock, int backlog) 3460 { 3461 return sock->ops->listen(sock, backlog); 3462 } 3463 EXPORT_SYMBOL(kernel_listen); 3464 3465 /** 3466 * kernel_accept - accept a connection (kernel space) 3467 * @sock: listening socket 3468 * @newsock: new connected socket 3469 * @flags: flags 3470 * 3471 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. 3472 * If it fails, @newsock is guaranteed to be %NULL. 3473 * Returns 0 or an error. 3474 */ 3475 3476 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3477 { 3478 struct sock *sk = sock->sk; 3479 int err; 3480 3481 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3482 newsock); 3483 if (err < 0) 3484 goto done; 3485 3486 err = sock->ops->accept(sock, *newsock, flags, true); 3487 if (err < 0) { 3488 sock_release(*newsock); 3489 *newsock = NULL; 3490 goto done; 3491 } 3492 3493 (*newsock)->ops = sock->ops; 3494 __module_get((*newsock)->ops->owner); 3495 3496 done: 3497 return err; 3498 } 3499 EXPORT_SYMBOL(kernel_accept); 3500 3501 /** 3502 * kernel_connect - connect a socket (kernel space) 3503 * @sock: socket 3504 * @addr: address 3505 * @addrlen: address length 3506 * @flags: flags (O_NONBLOCK, ...) 3507 * 3508 * For datagram sockets, @addr is the address to which datagrams are sent 3509 * by default, and the only address from which datagrams are received. 3510 * For stream sockets, attempts to connect to @addr. 3511 * Returns 0 or an error code. 3512 */ 3513 3514 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3515 int flags) 3516 { 3517 return sock->ops->connect(sock, addr, addrlen, flags); 3518 } 3519 EXPORT_SYMBOL(kernel_connect); 3520 3521 /** 3522 * kernel_getsockname - get the address which the socket is bound (kernel space) 3523 * @sock: socket 3524 * @addr: address holder 3525 * 3526 * Fills the @addr pointer with the address which the socket is bound. 3527 * Returns the length of the address in bytes or an error code. 3528 */ 3529 3530 int kernel_getsockname(struct socket *sock, struct sockaddr *addr) 3531 { 3532 return sock->ops->getname(sock, addr, 0); 3533 } 3534 EXPORT_SYMBOL(kernel_getsockname); 3535 3536 /** 3537 * kernel_getpeername - get the address which the socket is connected (kernel space) 3538 * @sock: socket 3539 * @addr: address holder 3540 * 3541 * Fills the @addr pointer with the address which the socket is connected. 3542 * Returns the length of the address in bytes or an error code. 3543 */ 3544 3545 int kernel_getpeername(struct socket *sock, struct sockaddr *addr) 3546 { 3547 return sock->ops->getname(sock, addr, 1); 3548 } 3549 EXPORT_SYMBOL(kernel_getpeername); 3550 3551 /** 3552 * kernel_sendpage - send a &page through a socket (kernel space) 3553 * @sock: socket 3554 * @page: page 3555 * @offset: page offset 3556 * @size: total size in bytes 3557 * @flags: flags (MSG_DONTWAIT, ...) 3558 * 3559 * Returns the total amount sent in bytes or an error. 3560 */ 3561 3562 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3563 size_t size, int flags) 3564 { 3565 if (sock->ops->sendpage) { 3566 /* Warn in case the improper page to zero-copy send */ 3567 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send"); 3568 return sock->ops->sendpage(sock, page, offset, size, flags); 3569 } 3570 return sock_no_sendpage(sock, page, offset, size, flags); 3571 } 3572 EXPORT_SYMBOL(kernel_sendpage); 3573 3574 /** 3575 * kernel_sendpage_locked - send a &page through the locked sock (kernel space) 3576 * @sk: sock 3577 * @page: page 3578 * @offset: page offset 3579 * @size: total size in bytes 3580 * @flags: flags (MSG_DONTWAIT, ...) 3581 * 3582 * Returns the total amount sent in bytes or an error. 3583 * Caller must hold @sk. 3584 */ 3585 3586 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3587 size_t size, int flags) 3588 { 3589 struct socket *sock = sk->sk_socket; 3590 3591 if (sock->ops->sendpage_locked) 3592 return sock->ops->sendpage_locked(sk, page, offset, size, 3593 flags); 3594 3595 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3596 } 3597 EXPORT_SYMBOL(kernel_sendpage_locked); 3598 3599 /** 3600 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) 3601 * @sock: socket 3602 * @how: connection part 3603 * 3604 * Returns 0 or an error. 3605 */ 3606 3607 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3608 { 3609 return sock->ops->shutdown(sock, how); 3610 } 3611 EXPORT_SYMBOL(kernel_sock_shutdown); 3612 3613 /** 3614 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket 3615 * @sk: socket 3616 * 3617 * This routine returns the IP overhead imposed by a socket i.e. 3618 * the length of the underlying IP header, depending on whether 3619 * this is an IPv4 or IPv6 socket and the length from IP options turned 3620 * on at the socket. Assumes that the caller has a lock on the socket. 3621 */ 3622 3623 u32 kernel_sock_ip_overhead(struct sock *sk) 3624 { 3625 struct inet_sock *inet; 3626 struct ip_options_rcu *opt; 3627 u32 overhead = 0; 3628 #if IS_ENABLED(CONFIG_IPV6) 3629 struct ipv6_pinfo *np; 3630 struct ipv6_txoptions *optv6 = NULL; 3631 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3632 3633 if (!sk) 3634 return overhead; 3635 3636 switch (sk->sk_family) { 3637 case AF_INET: 3638 inet = inet_sk(sk); 3639 overhead += sizeof(struct iphdr); 3640 opt = rcu_dereference_protected(inet->inet_opt, 3641 sock_owned_by_user(sk)); 3642 if (opt) 3643 overhead += opt->opt.optlen; 3644 return overhead; 3645 #if IS_ENABLED(CONFIG_IPV6) 3646 case AF_INET6: 3647 np = inet6_sk(sk); 3648 overhead += sizeof(struct ipv6hdr); 3649 if (np) 3650 optv6 = rcu_dereference_protected(np->opt, 3651 sock_owned_by_user(sk)); 3652 if (optv6) 3653 overhead += (optv6->opt_flen + optv6->opt_nflen); 3654 return overhead; 3655 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3656 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3657 return overhead; 3658 } 3659 } 3660 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3661