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/ethtool.h> 56 #include <linux/mm.h> 57 #include <linux/socket.h> 58 #include <linux/file.h> 59 #include <linux/net.h> 60 #include <linux/interrupt.h> 61 #include <linux/thread_info.h> 62 #include <linux/rcupdate.h> 63 #include <linux/netdevice.h> 64 #include <linux/proc_fs.h> 65 #include <linux/seq_file.h> 66 #include <linux/mutex.h> 67 #include <linux/if_bridge.h> 68 #include <linux/if_vlan.h> 69 #include <linux/ptp_classify.h> 70 #include <linux/init.h> 71 #include <linux/poll.h> 72 #include <linux/cache.h> 73 #include <linux/module.h> 74 #include <linux/highmem.h> 75 #include <linux/mount.h> 76 #include <linux/pseudo_fs.h> 77 #include <linux/security.h> 78 #include <linux/syscalls.h> 79 #include <linux/compat.h> 80 #include <linux/kmod.h> 81 #include <linux/audit.h> 82 #include <linux/wireless.h> 83 #include <linux/nsproxy.h> 84 #include <linux/magic.h> 85 #include <linux/slab.h> 86 #include <linux/xattr.h> 87 #include <linux/nospec.h> 88 #include <linux/indirect_call_wrapper.h> 89 90 #include <linux/uaccess.h> 91 #include <asm/unistd.h> 92 93 #include <net/compat.h> 94 #include <net/wext.h> 95 #include <net/cls_cgroup.h> 96 97 #include <net/sock.h> 98 #include <linux/netfilter.h> 99 100 #include <linux/if_tun.h> 101 #include <linux/ipv6_route.h> 102 #include <linux/route.h> 103 #include <linux/termios.h> 104 #include <linux/sockios.h> 105 #include <net/busy_poll.h> 106 #include <linux/errqueue.h> 107 108 #ifdef CONFIG_NET_RX_BUSY_POLL 109 unsigned int sysctl_net_busy_read __read_mostly; 110 unsigned int sysctl_net_busy_poll __read_mostly; 111 #endif 112 113 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 114 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 115 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 116 117 static int sock_close(struct inode *inode, struct file *file); 118 static __poll_t sock_poll(struct file *file, 119 struct poll_table_struct *wait); 120 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 121 #ifdef CONFIG_COMPAT 122 static long compat_sock_ioctl(struct file *file, 123 unsigned int cmd, unsigned long arg); 124 #endif 125 static int sock_fasync(int fd, struct file *filp, int on); 126 static ssize_t sock_sendpage(struct file *file, struct page *page, 127 int offset, size_t size, loff_t *ppos, int more); 128 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 129 struct pipe_inode_info *pipe, size_t len, 130 unsigned int flags); 131 132 #ifdef CONFIG_PROC_FS 133 static void sock_show_fdinfo(struct seq_file *m, struct file *f) 134 { 135 struct socket *sock = f->private_data; 136 137 if (sock->ops->show_fdinfo) 138 sock->ops->show_fdinfo(m, sock); 139 } 140 #else 141 #define sock_show_fdinfo NULL 142 #endif 143 144 /* 145 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 146 * in the operation structures but are done directly via the socketcall() multiplexor. 147 */ 148 149 static const struct file_operations socket_file_ops = { 150 .owner = THIS_MODULE, 151 .llseek = no_llseek, 152 .read_iter = sock_read_iter, 153 .write_iter = sock_write_iter, 154 .poll = sock_poll, 155 .unlocked_ioctl = sock_ioctl, 156 #ifdef CONFIG_COMPAT 157 .compat_ioctl = compat_sock_ioctl, 158 #endif 159 .mmap = sock_mmap, 160 .release = sock_close, 161 .fasync = sock_fasync, 162 .sendpage = sock_sendpage, 163 .splice_write = generic_splice_sendpage, 164 .splice_read = sock_splice_read, 165 .show_fdinfo = sock_show_fdinfo, 166 }; 167 168 /* 169 * The protocol list. Each protocol is registered in here. 170 */ 171 172 static DEFINE_SPINLOCK(net_family_lock); 173 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 174 175 /* 176 * Support routines. 177 * Move socket addresses back and forth across the kernel/user 178 * divide and look after the messy bits. 179 */ 180 181 /** 182 * move_addr_to_kernel - copy a socket address into kernel space 183 * @uaddr: Address in user space 184 * @kaddr: Address in kernel space 185 * @ulen: Length in user space 186 * 187 * The address is copied into kernel space. If the provided address is 188 * too long an error code of -EINVAL is returned. If the copy gives 189 * invalid addresses -EFAULT is returned. On a success 0 is returned. 190 */ 191 192 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 193 { 194 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 195 return -EINVAL; 196 if (ulen == 0) 197 return 0; 198 if (copy_from_user(kaddr, uaddr, ulen)) 199 return -EFAULT; 200 return audit_sockaddr(ulen, kaddr); 201 } 202 203 /** 204 * move_addr_to_user - copy an address to user space 205 * @kaddr: kernel space address 206 * @klen: length of address in kernel 207 * @uaddr: user space address 208 * @ulen: pointer to user length field 209 * 210 * The value pointed to by ulen on entry is the buffer length available. 211 * This is overwritten with the buffer space used. -EINVAL is returned 212 * if an overlong buffer is specified or a negative buffer size. -EFAULT 213 * is returned if either the buffer or the length field are not 214 * accessible. 215 * After copying the data up to the limit the user specifies, the true 216 * length of the data is written over the length limit the user 217 * specified. Zero is returned for a success. 218 */ 219 220 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 221 void __user *uaddr, int __user *ulen) 222 { 223 int err; 224 int len; 225 226 BUG_ON(klen > sizeof(struct sockaddr_storage)); 227 err = get_user(len, ulen); 228 if (err) 229 return err; 230 if (len > klen) 231 len = klen; 232 if (len < 0) 233 return -EINVAL; 234 if (len) { 235 if (audit_sockaddr(klen, kaddr)) 236 return -ENOMEM; 237 if (copy_to_user(uaddr, kaddr, len)) 238 return -EFAULT; 239 } 240 /* 241 * "fromlen shall refer to the value before truncation.." 242 * 1003.1g 243 */ 244 return __put_user(klen, ulen); 245 } 246 247 static struct kmem_cache *sock_inode_cachep __ro_after_init; 248 249 static struct inode *sock_alloc_inode(struct super_block *sb) 250 { 251 struct socket_alloc *ei; 252 253 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 254 if (!ei) 255 return NULL; 256 init_waitqueue_head(&ei->socket.wq.wait); 257 ei->socket.wq.fasync_list = NULL; 258 ei->socket.wq.flags = 0; 259 260 ei->socket.state = SS_UNCONNECTED; 261 ei->socket.flags = 0; 262 ei->socket.ops = NULL; 263 ei->socket.sk = NULL; 264 ei->socket.file = NULL; 265 266 return &ei->vfs_inode; 267 } 268 269 static void sock_free_inode(struct inode *inode) 270 { 271 struct socket_alloc *ei; 272 273 ei = container_of(inode, struct socket_alloc, vfs_inode); 274 kmem_cache_free(sock_inode_cachep, ei); 275 } 276 277 static void init_once(void *foo) 278 { 279 struct socket_alloc *ei = (struct socket_alloc *)foo; 280 281 inode_init_once(&ei->vfs_inode); 282 } 283 284 static void init_inodecache(void) 285 { 286 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 287 sizeof(struct socket_alloc), 288 0, 289 (SLAB_HWCACHE_ALIGN | 290 SLAB_RECLAIM_ACCOUNT | 291 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 292 init_once); 293 BUG_ON(sock_inode_cachep == NULL); 294 } 295 296 static const struct super_operations sockfs_ops = { 297 .alloc_inode = sock_alloc_inode, 298 .free_inode = sock_free_inode, 299 .statfs = simple_statfs, 300 }; 301 302 /* 303 * sockfs_dname() is called from d_path(). 304 */ 305 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 306 { 307 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 308 d_inode(dentry)->i_ino); 309 } 310 311 static const struct dentry_operations sockfs_dentry_operations = { 312 .d_dname = sockfs_dname, 313 }; 314 315 static int sockfs_xattr_get(const struct xattr_handler *handler, 316 struct dentry *dentry, struct inode *inode, 317 const char *suffix, void *value, size_t size) 318 { 319 if (value) { 320 if (dentry->d_name.len + 1 > size) 321 return -ERANGE; 322 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 323 } 324 return dentry->d_name.len + 1; 325 } 326 327 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 328 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 329 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 330 331 static const struct xattr_handler sockfs_xattr_handler = { 332 .name = XATTR_NAME_SOCKPROTONAME, 333 .get = sockfs_xattr_get, 334 }; 335 336 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 337 struct dentry *dentry, struct inode *inode, 338 const char *suffix, const void *value, 339 size_t size, int flags) 340 { 341 /* Handled by LSM. */ 342 return -EAGAIN; 343 } 344 345 static const struct xattr_handler sockfs_security_xattr_handler = { 346 .prefix = XATTR_SECURITY_PREFIX, 347 .set = sockfs_security_xattr_set, 348 }; 349 350 static const struct xattr_handler *sockfs_xattr_handlers[] = { 351 &sockfs_xattr_handler, 352 &sockfs_security_xattr_handler, 353 NULL 354 }; 355 356 static int sockfs_init_fs_context(struct fs_context *fc) 357 { 358 struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); 359 if (!ctx) 360 return -ENOMEM; 361 ctx->ops = &sockfs_ops; 362 ctx->dops = &sockfs_dentry_operations; 363 ctx->xattr = sockfs_xattr_handlers; 364 return 0; 365 } 366 367 static struct vfsmount *sock_mnt __read_mostly; 368 369 static struct file_system_type sock_fs_type = { 370 .name = "sockfs", 371 .init_fs_context = sockfs_init_fs_context, 372 .kill_sb = kill_anon_super, 373 }; 374 375 /* 376 * Obtains the first available file descriptor and sets it up for use. 377 * 378 * These functions create file structures and maps them to fd space 379 * of the current process. On success it returns file descriptor 380 * and file struct implicitly stored in sock->file. 381 * Note that another thread may close file descriptor before we return 382 * from this function. We use the fact that now we do not refer 383 * to socket after mapping. If one day we will need it, this 384 * function will increment ref. count on file by 1. 385 * 386 * In any case returned fd MAY BE not valid! 387 * This race condition is unavoidable 388 * with shared fd spaces, we cannot solve it inside kernel, 389 * but we take care of internal coherence yet. 390 */ 391 392 /** 393 * sock_alloc_file - Bind a &socket to a &file 394 * @sock: socket 395 * @flags: file status flags 396 * @dname: protocol name 397 * 398 * Returns the &file bound with @sock, implicitly storing it 399 * in sock->file. If dname is %NULL, sets to "". 400 * On failure the return is a ERR pointer (see linux/err.h). 401 * This function uses GFP_KERNEL internally. 402 */ 403 404 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 405 { 406 struct file *file; 407 408 if (!dname) 409 dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; 410 411 file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, 412 O_RDWR | (flags & O_NONBLOCK), 413 &socket_file_ops); 414 if (IS_ERR(file)) { 415 sock_release(sock); 416 return file; 417 } 418 419 sock->file = file; 420 file->private_data = sock; 421 stream_open(SOCK_INODE(sock), file); 422 return file; 423 } 424 EXPORT_SYMBOL(sock_alloc_file); 425 426 static int sock_map_fd(struct socket *sock, int flags) 427 { 428 struct file *newfile; 429 int fd = get_unused_fd_flags(flags); 430 if (unlikely(fd < 0)) { 431 sock_release(sock); 432 return fd; 433 } 434 435 newfile = sock_alloc_file(sock, flags, NULL); 436 if (!IS_ERR(newfile)) { 437 fd_install(fd, newfile); 438 return fd; 439 } 440 441 put_unused_fd(fd); 442 return PTR_ERR(newfile); 443 } 444 445 /** 446 * sock_from_file - Return the &socket bounded to @file. 447 * @file: file 448 * @err: pointer to an error code return 449 * 450 * On failure returns %NULL and assigns -ENOTSOCK to @err. 451 */ 452 453 struct socket *sock_from_file(struct file *file, int *err) 454 { 455 if (file->f_op == &socket_file_ops) 456 return file->private_data; /* set in sock_map_fd */ 457 458 *err = -ENOTSOCK; 459 return NULL; 460 } 461 EXPORT_SYMBOL(sock_from_file); 462 463 /** 464 * sockfd_lookup - Go from a file number to its socket slot 465 * @fd: file handle 466 * @err: pointer to an error code return 467 * 468 * The file handle passed in is locked and the socket it is bound 469 * to is returned. If an error occurs the err pointer is overwritten 470 * with a negative errno code and NULL is returned. The function checks 471 * for both invalid handles and passing a handle which is not a socket. 472 * 473 * On a success the socket object pointer is returned. 474 */ 475 476 struct socket *sockfd_lookup(int fd, int *err) 477 { 478 struct file *file; 479 struct socket *sock; 480 481 file = fget(fd); 482 if (!file) { 483 *err = -EBADF; 484 return NULL; 485 } 486 487 sock = sock_from_file(file, err); 488 if (!sock) 489 fput(file); 490 return sock; 491 } 492 EXPORT_SYMBOL(sockfd_lookup); 493 494 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 495 { 496 struct fd f = fdget(fd); 497 struct socket *sock; 498 499 *err = -EBADF; 500 if (f.file) { 501 sock = sock_from_file(f.file, err); 502 if (likely(sock)) { 503 *fput_needed = f.flags & FDPUT_FPUT; 504 return sock; 505 } 506 fdput(f); 507 } 508 return NULL; 509 } 510 511 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 512 size_t size) 513 { 514 ssize_t len; 515 ssize_t used = 0; 516 517 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 518 if (len < 0) 519 return len; 520 used += len; 521 if (buffer) { 522 if (size < used) 523 return -ERANGE; 524 buffer += len; 525 } 526 527 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 528 used += len; 529 if (buffer) { 530 if (size < used) 531 return -ERANGE; 532 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 533 buffer += len; 534 } 535 536 return used; 537 } 538 539 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 540 { 541 int err = simple_setattr(dentry, iattr); 542 543 if (!err && (iattr->ia_valid & ATTR_UID)) { 544 struct socket *sock = SOCKET_I(d_inode(dentry)); 545 546 if (sock->sk) 547 sock->sk->sk_uid = iattr->ia_uid; 548 else 549 err = -ENOENT; 550 } 551 552 return err; 553 } 554 555 static const struct inode_operations sockfs_inode_ops = { 556 .listxattr = sockfs_listxattr, 557 .setattr = sockfs_setattr, 558 }; 559 560 /** 561 * sock_alloc - allocate a socket 562 * 563 * Allocate a new inode and socket object. The two are bound together 564 * and initialised. The socket is then returned. If we are out of inodes 565 * NULL is returned. This functions uses GFP_KERNEL internally. 566 */ 567 568 struct socket *sock_alloc(void) 569 { 570 struct inode *inode; 571 struct socket *sock; 572 573 inode = new_inode_pseudo(sock_mnt->mnt_sb); 574 if (!inode) 575 return NULL; 576 577 sock = SOCKET_I(inode); 578 579 inode->i_ino = get_next_ino(); 580 inode->i_mode = S_IFSOCK | S_IRWXUGO; 581 inode->i_uid = current_fsuid(); 582 inode->i_gid = current_fsgid(); 583 inode->i_op = &sockfs_inode_ops; 584 585 return sock; 586 } 587 EXPORT_SYMBOL(sock_alloc); 588 589 static void __sock_release(struct socket *sock, struct inode *inode) 590 { 591 if (sock->ops) { 592 struct module *owner = sock->ops->owner; 593 594 if (inode) 595 inode_lock(inode); 596 sock->ops->release(sock); 597 sock->sk = NULL; 598 if (inode) 599 inode_unlock(inode); 600 sock->ops = NULL; 601 module_put(owner); 602 } 603 604 if (sock->wq.fasync_list) 605 pr_err("%s: fasync list not empty!\n", __func__); 606 607 if (!sock->file) { 608 iput(SOCK_INODE(sock)); 609 return; 610 } 611 sock->file = NULL; 612 } 613 614 /** 615 * sock_release - close a socket 616 * @sock: socket to close 617 * 618 * The socket is released from the protocol stack if it has a release 619 * callback, and the inode is then released if the socket is bound to 620 * an inode not a file. 621 */ 622 void sock_release(struct socket *sock) 623 { 624 __sock_release(sock, NULL); 625 } 626 EXPORT_SYMBOL(sock_release); 627 628 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 629 { 630 u8 flags = *tx_flags; 631 632 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 633 flags |= SKBTX_HW_TSTAMP; 634 635 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 636 flags |= SKBTX_SW_TSTAMP; 637 638 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 639 flags |= SKBTX_SCHED_TSTAMP; 640 641 *tx_flags = flags; 642 } 643 EXPORT_SYMBOL(__sock_tx_timestamp); 644 645 INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, 646 size_t)); 647 INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, 648 size_t)); 649 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 650 { 651 int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, 652 inet_sendmsg, sock, msg, 653 msg_data_left(msg)); 654 BUG_ON(ret == -EIOCBQUEUED); 655 return ret; 656 } 657 658 /** 659 * sock_sendmsg - send a message through @sock 660 * @sock: socket 661 * @msg: message to send 662 * 663 * Sends @msg through @sock, passing through LSM. 664 * Returns the number of bytes sent, or an error code. 665 */ 666 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 667 { 668 int err = security_socket_sendmsg(sock, msg, 669 msg_data_left(msg)); 670 671 return err ?: sock_sendmsg_nosec(sock, msg); 672 } 673 EXPORT_SYMBOL(sock_sendmsg); 674 675 /** 676 * kernel_sendmsg - send a message through @sock (kernel-space) 677 * @sock: socket 678 * @msg: message header 679 * @vec: kernel vec 680 * @num: vec array length 681 * @size: total message data size 682 * 683 * Builds the message data with @vec and sends it through @sock. 684 * Returns the number of bytes sent, or an error code. 685 */ 686 687 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 688 struct kvec *vec, size_t num, size_t size) 689 { 690 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 691 return sock_sendmsg(sock, msg); 692 } 693 EXPORT_SYMBOL(kernel_sendmsg); 694 695 /** 696 * kernel_sendmsg_locked - send a message through @sock (kernel-space) 697 * @sk: sock 698 * @msg: message header 699 * @vec: output s/g array 700 * @num: output s/g array length 701 * @size: total message data size 702 * 703 * Builds the message data with @vec and sends it through @sock. 704 * Returns the number of bytes sent, or an error code. 705 * Caller must hold @sk. 706 */ 707 708 int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, 709 struct kvec *vec, size_t num, size_t size) 710 { 711 struct socket *sock = sk->sk_socket; 712 713 if (!sock->ops->sendmsg_locked) 714 return sock_no_sendmsg_locked(sk, msg, size); 715 716 iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); 717 718 return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); 719 } 720 EXPORT_SYMBOL(kernel_sendmsg_locked); 721 722 static bool skb_is_err_queue(const struct sk_buff *skb) 723 { 724 /* pkt_type of skbs enqueued on the error queue are set to 725 * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do 726 * in recvmsg, since skbs received on a local socket will never 727 * have a pkt_type of PACKET_OUTGOING. 728 */ 729 return skb->pkt_type == PACKET_OUTGOING; 730 } 731 732 /* On transmit, software and hardware timestamps are returned independently. 733 * As the two skb clones share the hardware timestamp, which may be updated 734 * before the software timestamp is received, a hardware TX timestamp may be 735 * returned only if there is no software TX timestamp. Ignore false software 736 * timestamps, which may be made in the __sock_recv_timestamp() call when the 737 * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a 738 * hardware timestamp. 739 */ 740 static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) 741 { 742 return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); 743 } 744 745 static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) 746 { 747 struct scm_ts_pktinfo ts_pktinfo; 748 struct net_device *orig_dev; 749 750 if (!skb_mac_header_was_set(skb)) 751 return; 752 753 memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); 754 755 rcu_read_lock(); 756 orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); 757 if (orig_dev) 758 ts_pktinfo.if_index = orig_dev->ifindex; 759 rcu_read_unlock(); 760 761 ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); 762 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, 763 sizeof(ts_pktinfo), &ts_pktinfo); 764 } 765 766 /* 767 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 768 */ 769 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 770 struct sk_buff *skb) 771 { 772 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 773 int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); 774 struct scm_timestamping_internal tss; 775 776 int empty = 1, false_tstamp = 0; 777 struct skb_shared_hwtstamps *shhwtstamps = 778 skb_hwtstamps(skb); 779 780 /* Race occurred between timestamp enabling and packet 781 receiving. Fill in the current time for now. */ 782 if (need_software_tstamp && skb->tstamp == 0) { 783 __net_timestamp(skb); 784 false_tstamp = 1; 785 } 786 787 if (need_software_tstamp) { 788 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 789 if (new_tstamp) { 790 struct __kernel_sock_timeval tv; 791 792 skb_get_new_timestamp(skb, &tv); 793 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, 794 sizeof(tv), &tv); 795 } else { 796 struct __kernel_old_timeval tv; 797 798 skb_get_timestamp(skb, &tv); 799 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, 800 sizeof(tv), &tv); 801 } 802 } else { 803 if (new_tstamp) { 804 struct __kernel_timespec ts; 805 806 skb_get_new_timestampns(skb, &ts); 807 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, 808 sizeof(ts), &ts); 809 } else { 810 struct __kernel_old_timespec ts; 811 812 skb_get_timestampns(skb, &ts); 813 put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, 814 sizeof(ts), &ts); 815 } 816 } 817 } 818 819 memset(&tss, 0, sizeof(tss)); 820 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 821 ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) 822 empty = 0; 823 if (shhwtstamps && 824 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 825 !skb_is_swtx_tstamp(skb, false_tstamp) && 826 ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { 827 empty = 0; 828 if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && 829 !skb_is_err_queue(skb)) 830 put_ts_pktinfo(msg, skb); 831 } 832 if (!empty) { 833 if (sock_flag(sk, SOCK_TSTAMP_NEW)) 834 put_cmsg_scm_timestamping64(msg, &tss); 835 else 836 put_cmsg_scm_timestamping(msg, &tss); 837 838 if (skb_is_err_queue(skb) && skb->len && 839 SKB_EXT_ERR(skb)->opt_stats) 840 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 841 skb->len, skb->data); 842 } 843 } 844 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 845 846 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 847 struct sk_buff *skb) 848 { 849 int ack; 850 851 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 852 return; 853 if (!skb->wifi_acked_valid) 854 return; 855 856 ack = skb->wifi_acked; 857 858 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 859 } 860 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 861 862 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 863 struct sk_buff *skb) 864 { 865 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 866 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 867 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 868 } 869 870 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 871 struct sk_buff *skb) 872 { 873 sock_recv_timestamp(msg, sk, skb); 874 sock_recv_drops(msg, sk, skb); 875 } 876 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 877 878 INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, 879 size_t, int)); 880 INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, 881 size_t, int)); 882 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 883 int flags) 884 { 885 return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, 886 inet_recvmsg, sock, msg, msg_data_left(msg), 887 flags); 888 } 889 890 /** 891 * sock_recvmsg - receive a message from @sock 892 * @sock: socket 893 * @msg: message to receive 894 * @flags: message flags 895 * 896 * Receives @msg from @sock, passing through LSM. Returns the total number 897 * of bytes received, or an error. 898 */ 899 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 900 { 901 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 902 903 return err ?: sock_recvmsg_nosec(sock, msg, flags); 904 } 905 EXPORT_SYMBOL(sock_recvmsg); 906 907 /** 908 * kernel_recvmsg - Receive a message from a socket (kernel space) 909 * @sock: The socket to receive the message from 910 * @msg: Received message 911 * @vec: Input s/g array for message data 912 * @num: Size of input s/g array 913 * @size: Number of bytes to read 914 * @flags: Message flags (MSG_DONTWAIT, etc...) 915 * 916 * On return the msg structure contains the scatter/gather array passed in the 917 * vec argument. The array is modified so that it consists of the unfilled 918 * portion of the original array. 919 * 920 * The returned value is the total number of bytes received, or an error. 921 */ 922 923 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 924 struct kvec *vec, size_t num, size_t size, int flags) 925 { 926 msg->msg_control_is_user = false; 927 iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); 928 return sock_recvmsg(sock, msg, flags); 929 } 930 EXPORT_SYMBOL(kernel_recvmsg); 931 932 static ssize_t sock_sendpage(struct file *file, struct page *page, 933 int offset, size_t size, loff_t *ppos, int more) 934 { 935 struct socket *sock; 936 int flags; 937 938 sock = file->private_data; 939 940 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 941 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 942 flags |= more; 943 944 return kernel_sendpage(sock, page, offset, size, flags); 945 } 946 947 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 948 struct pipe_inode_info *pipe, size_t len, 949 unsigned int flags) 950 { 951 struct socket *sock = file->private_data; 952 953 if (unlikely(!sock->ops->splice_read)) 954 return generic_file_splice_read(file, ppos, pipe, len, flags); 955 956 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 957 } 958 959 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 960 { 961 struct file *file = iocb->ki_filp; 962 struct socket *sock = file->private_data; 963 struct msghdr msg = {.msg_iter = *to, 964 .msg_iocb = iocb}; 965 ssize_t res; 966 967 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) 968 msg.msg_flags = MSG_DONTWAIT; 969 970 if (iocb->ki_pos != 0) 971 return -ESPIPE; 972 973 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 974 return 0; 975 976 res = sock_recvmsg(sock, &msg, msg.msg_flags); 977 *to = msg.msg_iter; 978 return res; 979 } 980 981 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 982 { 983 struct file *file = iocb->ki_filp; 984 struct socket *sock = file->private_data; 985 struct msghdr msg = {.msg_iter = *from, 986 .msg_iocb = iocb}; 987 ssize_t res; 988 989 if (iocb->ki_pos != 0) 990 return -ESPIPE; 991 992 if (file->f_flags & O_NONBLOCK || (iocb->ki_flags & IOCB_NOWAIT)) 993 msg.msg_flags = MSG_DONTWAIT; 994 995 if (sock->type == SOCK_SEQPACKET) 996 msg.msg_flags |= MSG_EOR; 997 998 res = sock_sendmsg(sock, &msg); 999 *from = msg.msg_iter; 1000 return res; 1001 } 1002 1003 /* 1004 * Atomic setting of ioctl hooks to avoid race 1005 * with module unload. 1006 */ 1007 1008 static DEFINE_MUTEX(br_ioctl_mutex); 1009 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 1010 1011 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 1012 { 1013 mutex_lock(&br_ioctl_mutex); 1014 br_ioctl_hook = hook; 1015 mutex_unlock(&br_ioctl_mutex); 1016 } 1017 EXPORT_SYMBOL(brioctl_set); 1018 1019 static DEFINE_MUTEX(vlan_ioctl_mutex); 1020 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 1021 1022 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 1023 { 1024 mutex_lock(&vlan_ioctl_mutex); 1025 vlan_ioctl_hook = hook; 1026 mutex_unlock(&vlan_ioctl_mutex); 1027 } 1028 EXPORT_SYMBOL(vlan_ioctl_set); 1029 1030 static long sock_do_ioctl(struct net *net, struct socket *sock, 1031 unsigned int cmd, unsigned long arg) 1032 { 1033 int err; 1034 void __user *argp = (void __user *)arg; 1035 1036 err = sock->ops->ioctl(sock, cmd, arg); 1037 1038 /* 1039 * If this ioctl is unknown try to hand it down 1040 * to the NIC driver. 1041 */ 1042 if (err != -ENOIOCTLCMD) 1043 return err; 1044 1045 if (cmd == SIOCGIFCONF) { 1046 struct ifconf ifc; 1047 if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) 1048 return -EFAULT; 1049 rtnl_lock(); 1050 err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); 1051 rtnl_unlock(); 1052 if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) 1053 err = -EFAULT; 1054 } else { 1055 struct ifreq ifr; 1056 bool need_copyout; 1057 if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 1058 return -EFAULT; 1059 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 1060 if (!err && need_copyout) 1061 if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 1062 return -EFAULT; 1063 } 1064 return err; 1065 } 1066 1067 /* 1068 * With an ioctl, arg may well be a user mode pointer, but we don't know 1069 * what to do with it - that's up to the protocol still. 1070 */ 1071 1072 /** 1073 * get_net_ns - increment the refcount of the network namespace 1074 * @ns: common namespace (net) 1075 * 1076 * Returns the net's common namespace. 1077 */ 1078 1079 struct ns_common *get_net_ns(struct ns_common *ns) 1080 { 1081 return &get_net(container_of(ns, struct net, ns))->ns; 1082 } 1083 EXPORT_SYMBOL_GPL(get_net_ns); 1084 1085 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 1086 { 1087 struct socket *sock; 1088 struct sock *sk; 1089 void __user *argp = (void __user *)arg; 1090 int pid, err; 1091 struct net *net; 1092 1093 sock = file->private_data; 1094 sk = sock->sk; 1095 net = sock_net(sk); 1096 if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { 1097 struct ifreq ifr; 1098 bool need_copyout; 1099 if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) 1100 return -EFAULT; 1101 err = dev_ioctl(net, cmd, &ifr, &need_copyout); 1102 if (!err && need_copyout) 1103 if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) 1104 return -EFAULT; 1105 } else 1106 #ifdef CONFIG_WEXT_CORE 1107 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 1108 err = wext_handle_ioctl(net, cmd, argp); 1109 } else 1110 #endif 1111 switch (cmd) { 1112 case FIOSETOWN: 1113 case SIOCSPGRP: 1114 err = -EFAULT; 1115 if (get_user(pid, (int __user *)argp)) 1116 break; 1117 err = f_setown(sock->file, pid, 1); 1118 break; 1119 case FIOGETOWN: 1120 case SIOCGPGRP: 1121 err = put_user(f_getown(sock->file), 1122 (int __user *)argp); 1123 break; 1124 case SIOCGIFBR: 1125 case SIOCSIFBR: 1126 case SIOCBRADDBR: 1127 case SIOCBRDELBR: 1128 err = -ENOPKG; 1129 if (!br_ioctl_hook) 1130 request_module("bridge"); 1131 1132 mutex_lock(&br_ioctl_mutex); 1133 if (br_ioctl_hook) 1134 err = br_ioctl_hook(net, cmd, argp); 1135 mutex_unlock(&br_ioctl_mutex); 1136 break; 1137 case SIOCGIFVLAN: 1138 case SIOCSIFVLAN: 1139 err = -ENOPKG; 1140 if (!vlan_ioctl_hook) 1141 request_module("8021q"); 1142 1143 mutex_lock(&vlan_ioctl_mutex); 1144 if (vlan_ioctl_hook) 1145 err = vlan_ioctl_hook(net, argp); 1146 mutex_unlock(&vlan_ioctl_mutex); 1147 break; 1148 case SIOCGSKNS: 1149 err = -EPERM; 1150 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1151 break; 1152 1153 err = open_related_ns(&net->ns, get_net_ns); 1154 break; 1155 case SIOCGSTAMP_OLD: 1156 case SIOCGSTAMPNS_OLD: 1157 if (!sock->ops->gettstamp) { 1158 err = -ENOIOCTLCMD; 1159 break; 1160 } 1161 err = sock->ops->gettstamp(sock, argp, 1162 cmd == SIOCGSTAMP_OLD, 1163 !IS_ENABLED(CONFIG_64BIT)); 1164 break; 1165 case SIOCGSTAMP_NEW: 1166 case SIOCGSTAMPNS_NEW: 1167 if (!sock->ops->gettstamp) { 1168 err = -ENOIOCTLCMD; 1169 break; 1170 } 1171 err = sock->ops->gettstamp(sock, argp, 1172 cmd == SIOCGSTAMP_NEW, 1173 false); 1174 break; 1175 default: 1176 err = sock_do_ioctl(net, sock, cmd, arg); 1177 break; 1178 } 1179 return err; 1180 } 1181 1182 /** 1183 * sock_create_lite - creates a socket 1184 * @family: protocol family (AF_INET, ...) 1185 * @type: communication type (SOCK_STREAM, ...) 1186 * @protocol: protocol (0, ...) 1187 * @res: new socket 1188 * 1189 * Creates a new socket and assigns it to @res, passing through LSM. 1190 * The new socket initialization is not complete, see kernel_accept(). 1191 * Returns 0 or an error. On failure @res is set to %NULL. 1192 * This function internally uses GFP_KERNEL. 1193 */ 1194 1195 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1196 { 1197 int err; 1198 struct socket *sock = NULL; 1199 1200 err = security_socket_create(family, type, protocol, 1); 1201 if (err) 1202 goto out; 1203 1204 sock = sock_alloc(); 1205 if (!sock) { 1206 err = -ENOMEM; 1207 goto out; 1208 } 1209 1210 sock->type = type; 1211 err = security_socket_post_create(sock, family, type, protocol, 1); 1212 if (err) 1213 goto out_release; 1214 1215 out: 1216 *res = sock; 1217 return err; 1218 out_release: 1219 sock_release(sock); 1220 sock = NULL; 1221 goto out; 1222 } 1223 EXPORT_SYMBOL(sock_create_lite); 1224 1225 /* No kernel lock held - perfect */ 1226 static __poll_t sock_poll(struct file *file, poll_table *wait) 1227 { 1228 struct socket *sock = file->private_data; 1229 __poll_t events = poll_requested_events(wait), flag = 0; 1230 1231 if (!sock->ops->poll) 1232 return 0; 1233 1234 if (sk_can_busy_loop(sock->sk)) { 1235 /* poll once if requested by the syscall */ 1236 if (events & POLL_BUSY_LOOP) 1237 sk_busy_loop(sock->sk, 1); 1238 1239 /* if this socket can poll_ll, tell the system call */ 1240 flag = POLL_BUSY_LOOP; 1241 } 1242 1243 return sock->ops->poll(file, sock, wait) | flag; 1244 } 1245 1246 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1247 { 1248 struct socket *sock = file->private_data; 1249 1250 return sock->ops->mmap(file, sock, vma); 1251 } 1252 1253 static int sock_close(struct inode *inode, struct file *filp) 1254 { 1255 __sock_release(SOCKET_I(inode), inode); 1256 return 0; 1257 } 1258 1259 /* 1260 * Update the socket async list 1261 * 1262 * Fasync_list locking strategy. 1263 * 1264 * 1. fasync_list is modified only under process context socket lock 1265 * i.e. under semaphore. 1266 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1267 * or under socket lock 1268 */ 1269 1270 static int sock_fasync(int fd, struct file *filp, int on) 1271 { 1272 struct socket *sock = filp->private_data; 1273 struct sock *sk = sock->sk; 1274 struct socket_wq *wq = &sock->wq; 1275 1276 if (sk == NULL) 1277 return -EINVAL; 1278 1279 lock_sock(sk); 1280 fasync_helper(fd, filp, on, &wq->fasync_list); 1281 1282 if (!wq->fasync_list) 1283 sock_reset_flag(sk, SOCK_FASYNC); 1284 else 1285 sock_set_flag(sk, SOCK_FASYNC); 1286 1287 release_sock(sk); 1288 return 0; 1289 } 1290 1291 /* This function may be called only under rcu_lock */ 1292 1293 int sock_wake_async(struct socket_wq *wq, int how, int band) 1294 { 1295 if (!wq || !wq->fasync_list) 1296 return -1; 1297 1298 switch (how) { 1299 case SOCK_WAKE_WAITD: 1300 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1301 break; 1302 goto call_kill; 1303 case SOCK_WAKE_SPACE: 1304 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1305 break; 1306 fallthrough; 1307 case SOCK_WAKE_IO: 1308 call_kill: 1309 kill_fasync(&wq->fasync_list, SIGIO, band); 1310 break; 1311 case SOCK_WAKE_URG: 1312 kill_fasync(&wq->fasync_list, SIGURG, band); 1313 } 1314 1315 return 0; 1316 } 1317 EXPORT_SYMBOL(sock_wake_async); 1318 1319 /** 1320 * __sock_create - creates a socket 1321 * @net: net namespace 1322 * @family: protocol family (AF_INET, ...) 1323 * @type: communication type (SOCK_STREAM, ...) 1324 * @protocol: protocol (0, ...) 1325 * @res: new socket 1326 * @kern: boolean for kernel space sockets 1327 * 1328 * Creates a new socket and assigns it to @res, passing through LSM. 1329 * Returns 0 or an error. On failure @res is set to %NULL. @kern must 1330 * be set to true if the socket resides in kernel space. 1331 * This function internally uses GFP_KERNEL. 1332 */ 1333 1334 int __sock_create(struct net *net, int family, int type, int protocol, 1335 struct socket **res, int kern) 1336 { 1337 int err; 1338 struct socket *sock; 1339 const struct net_proto_family *pf; 1340 1341 /* 1342 * Check protocol is in range 1343 */ 1344 if (family < 0 || family >= NPROTO) 1345 return -EAFNOSUPPORT; 1346 if (type < 0 || type >= SOCK_MAX) 1347 return -EINVAL; 1348 1349 /* Compatibility. 1350 1351 This uglymoron is moved from INET layer to here to avoid 1352 deadlock in module load. 1353 */ 1354 if (family == PF_INET && type == SOCK_PACKET) { 1355 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1356 current->comm); 1357 family = PF_PACKET; 1358 } 1359 1360 err = security_socket_create(family, type, protocol, kern); 1361 if (err) 1362 return err; 1363 1364 /* 1365 * Allocate the socket and allow the family to set things up. if 1366 * the protocol is 0, the family is instructed to select an appropriate 1367 * default. 1368 */ 1369 sock = sock_alloc(); 1370 if (!sock) { 1371 net_warn_ratelimited("socket: no more sockets\n"); 1372 return -ENFILE; /* Not exactly a match, but its the 1373 closest posix thing */ 1374 } 1375 1376 sock->type = type; 1377 1378 #ifdef CONFIG_MODULES 1379 /* Attempt to load a protocol module if the find failed. 1380 * 1381 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1382 * requested real, full-featured networking support upon configuration. 1383 * Otherwise module support will break! 1384 */ 1385 if (rcu_access_pointer(net_families[family]) == NULL) 1386 request_module("net-pf-%d", family); 1387 #endif 1388 1389 rcu_read_lock(); 1390 pf = rcu_dereference(net_families[family]); 1391 err = -EAFNOSUPPORT; 1392 if (!pf) 1393 goto out_release; 1394 1395 /* 1396 * We will call the ->create function, that possibly is in a loadable 1397 * module, so we have to bump that loadable module refcnt first. 1398 */ 1399 if (!try_module_get(pf->owner)) 1400 goto out_release; 1401 1402 /* Now protected by module ref count */ 1403 rcu_read_unlock(); 1404 1405 err = pf->create(net, sock, protocol, kern); 1406 if (err < 0) 1407 goto out_module_put; 1408 1409 /* 1410 * Now to bump the refcnt of the [loadable] module that owns this 1411 * socket at sock_release time we decrement its refcnt. 1412 */ 1413 if (!try_module_get(sock->ops->owner)) 1414 goto out_module_busy; 1415 1416 /* 1417 * Now that we're done with the ->create function, the [loadable] 1418 * module can have its refcnt decremented 1419 */ 1420 module_put(pf->owner); 1421 err = security_socket_post_create(sock, family, type, protocol, kern); 1422 if (err) 1423 goto out_sock_release; 1424 *res = sock; 1425 1426 return 0; 1427 1428 out_module_busy: 1429 err = -EAFNOSUPPORT; 1430 out_module_put: 1431 sock->ops = NULL; 1432 module_put(pf->owner); 1433 out_sock_release: 1434 sock_release(sock); 1435 return err; 1436 1437 out_release: 1438 rcu_read_unlock(); 1439 goto out_sock_release; 1440 } 1441 EXPORT_SYMBOL(__sock_create); 1442 1443 /** 1444 * sock_create - creates a socket 1445 * @family: protocol family (AF_INET, ...) 1446 * @type: communication type (SOCK_STREAM, ...) 1447 * @protocol: protocol (0, ...) 1448 * @res: new socket 1449 * 1450 * A wrapper around __sock_create(). 1451 * Returns 0 or an error. This function internally uses GFP_KERNEL. 1452 */ 1453 1454 int sock_create(int family, int type, int protocol, struct socket **res) 1455 { 1456 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1457 } 1458 EXPORT_SYMBOL(sock_create); 1459 1460 /** 1461 * sock_create_kern - creates a socket (kernel space) 1462 * @net: net namespace 1463 * @family: protocol family (AF_INET, ...) 1464 * @type: communication type (SOCK_STREAM, ...) 1465 * @protocol: protocol (0, ...) 1466 * @res: new socket 1467 * 1468 * A wrapper around __sock_create(). 1469 * Returns 0 or an error. This function internally uses GFP_KERNEL. 1470 */ 1471 1472 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1473 { 1474 return __sock_create(net, family, type, protocol, res, 1); 1475 } 1476 EXPORT_SYMBOL(sock_create_kern); 1477 1478 int __sys_socket(int family, int type, int protocol) 1479 { 1480 int retval; 1481 struct socket *sock; 1482 int flags; 1483 1484 /* Check the SOCK_* constants for consistency. */ 1485 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1486 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1487 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1488 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1489 1490 flags = type & ~SOCK_TYPE_MASK; 1491 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1492 return -EINVAL; 1493 type &= SOCK_TYPE_MASK; 1494 1495 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1496 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1497 1498 retval = sock_create(family, type, protocol, &sock); 1499 if (retval < 0) 1500 return retval; 1501 1502 return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1503 } 1504 1505 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1506 { 1507 return __sys_socket(family, type, protocol); 1508 } 1509 1510 /* 1511 * Create a pair of connected sockets. 1512 */ 1513 1514 int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) 1515 { 1516 struct socket *sock1, *sock2; 1517 int fd1, fd2, err; 1518 struct file *newfile1, *newfile2; 1519 int flags; 1520 1521 flags = type & ~SOCK_TYPE_MASK; 1522 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1523 return -EINVAL; 1524 type &= SOCK_TYPE_MASK; 1525 1526 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1527 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1528 1529 /* 1530 * reserve descriptors and make sure we won't fail 1531 * to return them to userland. 1532 */ 1533 fd1 = get_unused_fd_flags(flags); 1534 if (unlikely(fd1 < 0)) 1535 return fd1; 1536 1537 fd2 = get_unused_fd_flags(flags); 1538 if (unlikely(fd2 < 0)) { 1539 put_unused_fd(fd1); 1540 return fd2; 1541 } 1542 1543 err = put_user(fd1, &usockvec[0]); 1544 if (err) 1545 goto out; 1546 1547 err = put_user(fd2, &usockvec[1]); 1548 if (err) 1549 goto out; 1550 1551 /* 1552 * Obtain the first socket and check if the underlying protocol 1553 * supports the socketpair call. 1554 */ 1555 1556 err = sock_create(family, type, protocol, &sock1); 1557 if (unlikely(err < 0)) 1558 goto out; 1559 1560 err = sock_create(family, type, protocol, &sock2); 1561 if (unlikely(err < 0)) { 1562 sock_release(sock1); 1563 goto out; 1564 } 1565 1566 err = security_socket_socketpair(sock1, sock2); 1567 if (unlikely(err)) { 1568 sock_release(sock2); 1569 sock_release(sock1); 1570 goto out; 1571 } 1572 1573 err = sock1->ops->socketpair(sock1, sock2); 1574 if (unlikely(err < 0)) { 1575 sock_release(sock2); 1576 sock_release(sock1); 1577 goto out; 1578 } 1579 1580 newfile1 = sock_alloc_file(sock1, flags, NULL); 1581 if (IS_ERR(newfile1)) { 1582 err = PTR_ERR(newfile1); 1583 sock_release(sock2); 1584 goto out; 1585 } 1586 1587 newfile2 = sock_alloc_file(sock2, flags, NULL); 1588 if (IS_ERR(newfile2)) { 1589 err = PTR_ERR(newfile2); 1590 fput(newfile1); 1591 goto out; 1592 } 1593 1594 audit_fd_pair(fd1, fd2); 1595 1596 fd_install(fd1, newfile1); 1597 fd_install(fd2, newfile2); 1598 return 0; 1599 1600 out: 1601 put_unused_fd(fd2); 1602 put_unused_fd(fd1); 1603 return err; 1604 } 1605 1606 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1607 int __user *, usockvec) 1608 { 1609 return __sys_socketpair(family, type, protocol, usockvec); 1610 } 1611 1612 /* 1613 * Bind a name to a socket. Nothing much to do here since it's 1614 * the protocol's responsibility to handle the local address. 1615 * 1616 * We move the socket address to kernel space before we call 1617 * the protocol layer (having also checked the address is ok). 1618 */ 1619 1620 int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) 1621 { 1622 struct socket *sock; 1623 struct sockaddr_storage address; 1624 int err, fput_needed; 1625 1626 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1627 if (sock) { 1628 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1629 if (!err) { 1630 err = security_socket_bind(sock, 1631 (struct sockaddr *)&address, 1632 addrlen); 1633 if (!err) 1634 err = sock->ops->bind(sock, 1635 (struct sockaddr *) 1636 &address, addrlen); 1637 } 1638 fput_light(sock->file, fput_needed); 1639 } 1640 return err; 1641 } 1642 1643 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1644 { 1645 return __sys_bind(fd, umyaddr, addrlen); 1646 } 1647 1648 /* 1649 * Perform a listen. Basically, we allow the protocol to do anything 1650 * necessary for a listen, and if that works, we mark the socket as 1651 * ready for listening. 1652 */ 1653 1654 int __sys_listen(int fd, int backlog) 1655 { 1656 struct socket *sock; 1657 int err, fput_needed; 1658 int somaxconn; 1659 1660 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1661 if (sock) { 1662 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1663 if ((unsigned int)backlog > somaxconn) 1664 backlog = somaxconn; 1665 1666 err = security_socket_listen(sock, backlog); 1667 if (!err) 1668 err = sock->ops->listen(sock, backlog); 1669 1670 fput_light(sock->file, fput_needed); 1671 } 1672 return err; 1673 } 1674 1675 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1676 { 1677 return __sys_listen(fd, backlog); 1678 } 1679 1680 int __sys_accept4_file(struct file *file, unsigned file_flags, 1681 struct sockaddr __user *upeer_sockaddr, 1682 int __user *upeer_addrlen, int flags, 1683 unsigned long nofile) 1684 { 1685 struct socket *sock, *newsock; 1686 struct file *newfile; 1687 int err, len, newfd; 1688 struct sockaddr_storage address; 1689 1690 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1691 return -EINVAL; 1692 1693 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1694 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1695 1696 sock = sock_from_file(file, &err); 1697 if (!sock) 1698 goto out; 1699 1700 err = -ENFILE; 1701 newsock = sock_alloc(); 1702 if (!newsock) 1703 goto out; 1704 1705 newsock->type = sock->type; 1706 newsock->ops = sock->ops; 1707 1708 /* 1709 * We don't need try_module_get here, as the listening socket (sock) 1710 * has the protocol module (sock->ops->owner) held. 1711 */ 1712 __module_get(newsock->ops->owner); 1713 1714 newfd = __get_unused_fd_flags(flags, nofile); 1715 if (unlikely(newfd < 0)) { 1716 err = newfd; 1717 sock_release(newsock); 1718 goto out; 1719 } 1720 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1721 if (IS_ERR(newfile)) { 1722 err = PTR_ERR(newfile); 1723 put_unused_fd(newfd); 1724 goto out; 1725 } 1726 1727 err = security_socket_accept(sock, newsock); 1728 if (err) 1729 goto out_fd; 1730 1731 err = sock->ops->accept(sock, newsock, sock->file->f_flags | file_flags, 1732 false); 1733 if (err < 0) 1734 goto out_fd; 1735 1736 if (upeer_sockaddr) { 1737 len = newsock->ops->getname(newsock, 1738 (struct sockaddr *)&address, 2); 1739 if (len < 0) { 1740 err = -ECONNABORTED; 1741 goto out_fd; 1742 } 1743 err = move_addr_to_user(&address, 1744 len, upeer_sockaddr, upeer_addrlen); 1745 if (err < 0) 1746 goto out_fd; 1747 } 1748 1749 /* File flags are not inherited via accept() unlike another OSes. */ 1750 1751 fd_install(newfd, newfile); 1752 err = newfd; 1753 out: 1754 return err; 1755 out_fd: 1756 fput(newfile); 1757 put_unused_fd(newfd); 1758 goto out; 1759 1760 } 1761 1762 /* 1763 * For accept, we attempt to create a new socket, set up the link 1764 * with the client, wake up the client, then return the new 1765 * connected fd. We collect the address of the connector in kernel 1766 * space and move it to user at the very end. This is unclean because 1767 * we open the socket then return an error. 1768 * 1769 * 1003.1g adds the ability to recvmsg() to query connection pending 1770 * status to recvmsg. We need to add that support in a way thats 1771 * clean when we restructure accept also. 1772 */ 1773 1774 int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, 1775 int __user *upeer_addrlen, int flags) 1776 { 1777 int ret = -EBADF; 1778 struct fd f; 1779 1780 f = fdget(fd); 1781 if (f.file) { 1782 ret = __sys_accept4_file(f.file, 0, upeer_sockaddr, 1783 upeer_addrlen, flags, 1784 rlimit(RLIMIT_NOFILE)); 1785 fdput(f); 1786 } 1787 1788 return ret; 1789 } 1790 1791 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1792 int __user *, upeer_addrlen, int, flags) 1793 { 1794 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); 1795 } 1796 1797 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1798 int __user *, upeer_addrlen) 1799 { 1800 return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1801 } 1802 1803 /* 1804 * Attempt to connect to a socket with the server address. The address 1805 * is in user space so we verify it is OK and move it to kernel space. 1806 * 1807 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1808 * break bindings 1809 * 1810 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1811 * other SEQPACKET protocols that take time to connect() as it doesn't 1812 * include the -EINPROGRESS status for such sockets. 1813 */ 1814 1815 int __sys_connect_file(struct file *file, struct sockaddr_storage *address, 1816 int addrlen, int file_flags) 1817 { 1818 struct socket *sock; 1819 int err; 1820 1821 sock = sock_from_file(file, &err); 1822 if (!sock) 1823 goto out; 1824 1825 err = 1826 security_socket_connect(sock, (struct sockaddr *)address, addrlen); 1827 if (err) 1828 goto out; 1829 1830 err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen, 1831 sock->file->f_flags | file_flags); 1832 out: 1833 return err; 1834 } 1835 1836 int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) 1837 { 1838 int ret = -EBADF; 1839 struct fd f; 1840 1841 f = fdget(fd); 1842 if (f.file) { 1843 struct sockaddr_storage address; 1844 1845 ret = move_addr_to_kernel(uservaddr, addrlen, &address); 1846 if (!ret) 1847 ret = __sys_connect_file(f.file, &address, addrlen, 0); 1848 fdput(f); 1849 } 1850 1851 return ret; 1852 } 1853 1854 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1855 int, addrlen) 1856 { 1857 return __sys_connect(fd, uservaddr, addrlen); 1858 } 1859 1860 /* 1861 * Get the local address ('name') of a socket object. Move the obtained 1862 * name to user space. 1863 */ 1864 1865 int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, 1866 int __user *usockaddr_len) 1867 { 1868 struct socket *sock; 1869 struct sockaddr_storage address; 1870 int err, fput_needed; 1871 1872 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1873 if (!sock) 1874 goto out; 1875 1876 err = security_socket_getsockname(sock); 1877 if (err) 1878 goto out_put; 1879 1880 err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); 1881 if (err < 0) 1882 goto out_put; 1883 /* "err" is actually length in this case */ 1884 err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); 1885 1886 out_put: 1887 fput_light(sock->file, fput_needed); 1888 out: 1889 return err; 1890 } 1891 1892 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1893 int __user *, usockaddr_len) 1894 { 1895 return __sys_getsockname(fd, usockaddr, usockaddr_len); 1896 } 1897 1898 /* 1899 * Get the remote address ('name') of a socket object. Move the obtained 1900 * name to user space. 1901 */ 1902 1903 int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, 1904 int __user *usockaddr_len) 1905 { 1906 struct socket *sock; 1907 struct sockaddr_storage address; 1908 int err, fput_needed; 1909 1910 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1911 if (sock != NULL) { 1912 err = security_socket_getpeername(sock); 1913 if (err) { 1914 fput_light(sock->file, fput_needed); 1915 return err; 1916 } 1917 1918 err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); 1919 if (err >= 0) 1920 /* "err" is actually length in this case */ 1921 err = move_addr_to_user(&address, err, usockaddr, 1922 usockaddr_len); 1923 fput_light(sock->file, fput_needed); 1924 } 1925 return err; 1926 } 1927 1928 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1929 int __user *, usockaddr_len) 1930 { 1931 return __sys_getpeername(fd, usockaddr, usockaddr_len); 1932 } 1933 1934 /* 1935 * Send a datagram to a given address. We move the address into kernel 1936 * space and check the user space data area is readable before invoking 1937 * the protocol. 1938 */ 1939 int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, 1940 struct sockaddr __user *addr, int addr_len) 1941 { 1942 struct socket *sock; 1943 struct sockaddr_storage address; 1944 int err; 1945 struct msghdr msg; 1946 struct iovec iov; 1947 int fput_needed; 1948 1949 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1950 if (unlikely(err)) 1951 return err; 1952 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1953 if (!sock) 1954 goto out; 1955 1956 msg.msg_name = NULL; 1957 msg.msg_control = NULL; 1958 msg.msg_controllen = 0; 1959 msg.msg_namelen = 0; 1960 if (addr) { 1961 err = move_addr_to_kernel(addr, addr_len, &address); 1962 if (err < 0) 1963 goto out_put; 1964 msg.msg_name = (struct sockaddr *)&address; 1965 msg.msg_namelen = addr_len; 1966 } 1967 if (sock->file->f_flags & O_NONBLOCK) 1968 flags |= MSG_DONTWAIT; 1969 msg.msg_flags = flags; 1970 err = sock_sendmsg(sock, &msg); 1971 1972 out_put: 1973 fput_light(sock->file, fput_needed); 1974 out: 1975 return err; 1976 } 1977 1978 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1979 unsigned int, flags, struct sockaddr __user *, addr, 1980 int, addr_len) 1981 { 1982 return __sys_sendto(fd, buff, len, flags, addr, addr_len); 1983 } 1984 1985 /* 1986 * Send a datagram down a socket. 1987 */ 1988 1989 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1990 unsigned int, flags) 1991 { 1992 return __sys_sendto(fd, buff, len, flags, NULL, 0); 1993 } 1994 1995 /* 1996 * Receive a frame from the socket and optionally record the address of the 1997 * sender. We verify the buffers are writable and if needed move the 1998 * sender address from kernel to user space. 1999 */ 2000 int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, 2001 struct sockaddr __user *addr, int __user *addr_len) 2002 { 2003 struct socket *sock; 2004 struct iovec iov; 2005 struct msghdr msg; 2006 struct sockaddr_storage address; 2007 int err, err2; 2008 int fput_needed; 2009 2010 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 2011 if (unlikely(err)) 2012 return err; 2013 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2014 if (!sock) 2015 goto out; 2016 2017 msg.msg_control = NULL; 2018 msg.msg_controllen = 0; 2019 /* Save some cycles and don't copy the address if not needed */ 2020 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 2021 /* We assume all kernel code knows the size of sockaddr_storage */ 2022 msg.msg_namelen = 0; 2023 msg.msg_iocb = NULL; 2024 msg.msg_flags = 0; 2025 if (sock->file->f_flags & O_NONBLOCK) 2026 flags |= MSG_DONTWAIT; 2027 err = sock_recvmsg(sock, &msg, flags); 2028 2029 if (err >= 0 && addr != NULL) { 2030 err2 = move_addr_to_user(&address, 2031 msg.msg_namelen, addr, addr_len); 2032 if (err2 < 0) 2033 err = err2; 2034 } 2035 2036 fput_light(sock->file, fput_needed); 2037 out: 2038 return err; 2039 } 2040 2041 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 2042 unsigned int, flags, struct sockaddr __user *, addr, 2043 int __user *, addr_len) 2044 { 2045 return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); 2046 } 2047 2048 /* 2049 * Receive a datagram from a socket. 2050 */ 2051 2052 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 2053 unsigned int, flags) 2054 { 2055 return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 2056 } 2057 2058 static bool sock_use_custom_sol_socket(const struct socket *sock) 2059 { 2060 const struct sock *sk = sock->sk; 2061 2062 /* Use sock->ops->setsockopt() for MPTCP */ 2063 return IS_ENABLED(CONFIG_MPTCP) && 2064 sk->sk_protocol == IPPROTO_MPTCP && 2065 sk->sk_type == SOCK_STREAM && 2066 (sk->sk_family == AF_INET || sk->sk_family == AF_INET6); 2067 } 2068 2069 /* 2070 * Set a socket option. Because we don't know the option lengths we have 2071 * to pass the user mode parameter for the protocols to sort out. 2072 */ 2073 int __sys_setsockopt(int fd, int level, int optname, char __user *user_optval, 2074 int optlen) 2075 { 2076 sockptr_t optval = USER_SOCKPTR(user_optval); 2077 char *kernel_optval = NULL; 2078 int err, fput_needed; 2079 struct socket *sock; 2080 2081 if (optlen < 0) 2082 return -EINVAL; 2083 2084 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2085 if (!sock) 2086 return err; 2087 2088 err = security_socket_setsockopt(sock, level, optname); 2089 if (err) 2090 goto out_put; 2091 2092 if (!in_compat_syscall()) 2093 err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, &optname, 2094 user_optval, &optlen, 2095 &kernel_optval); 2096 if (err < 0) 2097 goto out_put; 2098 if (err > 0) { 2099 err = 0; 2100 goto out_put; 2101 } 2102 2103 if (kernel_optval) 2104 optval = KERNEL_SOCKPTR(kernel_optval); 2105 if (level == SOL_SOCKET && !sock_use_custom_sol_socket(sock)) 2106 err = sock_setsockopt(sock, level, optname, optval, optlen); 2107 else if (unlikely(!sock->ops->setsockopt)) 2108 err = -EOPNOTSUPP; 2109 else 2110 err = sock->ops->setsockopt(sock, level, optname, optval, 2111 optlen); 2112 kfree(kernel_optval); 2113 out_put: 2114 fput_light(sock->file, fput_needed); 2115 return err; 2116 } 2117 2118 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 2119 char __user *, optval, int, optlen) 2120 { 2121 return __sys_setsockopt(fd, level, optname, optval, optlen); 2122 } 2123 2124 /* 2125 * Get a socket option. Because we don't know the option lengths we have 2126 * to pass a user mode parameter for the protocols to sort out. 2127 */ 2128 int __sys_getsockopt(int fd, int level, int optname, char __user *optval, 2129 int __user *optlen) 2130 { 2131 int err, fput_needed; 2132 struct socket *sock; 2133 int max_optlen; 2134 2135 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2136 if (!sock) 2137 return err; 2138 2139 err = security_socket_getsockopt(sock, level, optname); 2140 if (err) 2141 goto out_put; 2142 2143 if (!in_compat_syscall()) 2144 max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); 2145 2146 if (level == SOL_SOCKET) 2147 err = sock_getsockopt(sock, level, optname, optval, optlen); 2148 else if (unlikely(!sock->ops->getsockopt)) 2149 err = -EOPNOTSUPP; 2150 else 2151 err = sock->ops->getsockopt(sock, level, optname, optval, 2152 optlen); 2153 2154 if (!in_compat_syscall()) 2155 err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, 2156 optval, optlen, max_optlen, 2157 err); 2158 out_put: 2159 fput_light(sock->file, fput_needed); 2160 return err; 2161 } 2162 2163 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 2164 char __user *, optval, int __user *, optlen) 2165 { 2166 return __sys_getsockopt(fd, level, optname, optval, optlen); 2167 } 2168 2169 /* 2170 * Shutdown a socket. 2171 */ 2172 2173 int __sys_shutdown(int fd, int how) 2174 { 2175 int err, fput_needed; 2176 struct socket *sock; 2177 2178 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2179 if (sock != NULL) { 2180 err = security_socket_shutdown(sock, how); 2181 if (!err) 2182 err = sock->ops->shutdown(sock, how); 2183 fput_light(sock->file, fput_needed); 2184 } 2185 return err; 2186 } 2187 2188 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 2189 { 2190 return __sys_shutdown(fd, how); 2191 } 2192 2193 /* A couple of helpful macros for getting the address of the 32/64 bit 2194 * fields which are the same type (int / unsigned) on our platforms. 2195 */ 2196 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 2197 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 2198 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 2199 2200 struct used_address { 2201 struct sockaddr_storage name; 2202 unsigned int name_len; 2203 }; 2204 2205 int __copy_msghdr_from_user(struct msghdr *kmsg, 2206 struct user_msghdr __user *umsg, 2207 struct sockaddr __user **save_addr, 2208 struct iovec __user **uiov, size_t *nsegs) 2209 { 2210 struct user_msghdr msg; 2211 ssize_t err; 2212 2213 if (copy_from_user(&msg, umsg, sizeof(*umsg))) 2214 return -EFAULT; 2215 2216 kmsg->msg_control_is_user = true; 2217 kmsg->msg_control_user = msg.msg_control; 2218 kmsg->msg_controllen = msg.msg_controllen; 2219 kmsg->msg_flags = msg.msg_flags; 2220 2221 kmsg->msg_namelen = msg.msg_namelen; 2222 if (!msg.msg_name) 2223 kmsg->msg_namelen = 0; 2224 2225 if (kmsg->msg_namelen < 0) 2226 return -EINVAL; 2227 2228 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 2229 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 2230 2231 if (save_addr) 2232 *save_addr = msg.msg_name; 2233 2234 if (msg.msg_name && kmsg->msg_namelen) { 2235 if (!save_addr) { 2236 err = move_addr_to_kernel(msg.msg_name, 2237 kmsg->msg_namelen, 2238 kmsg->msg_name); 2239 if (err < 0) 2240 return err; 2241 } 2242 } else { 2243 kmsg->msg_name = NULL; 2244 kmsg->msg_namelen = 0; 2245 } 2246 2247 if (msg.msg_iovlen > UIO_MAXIOV) 2248 return -EMSGSIZE; 2249 2250 kmsg->msg_iocb = NULL; 2251 *uiov = msg.msg_iov; 2252 *nsegs = msg.msg_iovlen; 2253 return 0; 2254 } 2255 2256 static int copy_msghdr_from_user(struct msghdr *kmsg, 2257 struct user_msghdr __user *umsg, 2258 struct sockaddr __user **save_addr, 2259 struct iovec **iov) 2260 { 2261 struct user_msghdr msg; 2262 ssize_t err; 2263 2264 err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov, 2265 &msg.msg_iovlen); 2266 if (err) 2267 return err; 2268 2269 err = import_iovec(save_addr ? READ : WRITE, 2270 msg.msg_iov, msg.msg_iovlen, 2271 UIO_FASTIOV, iov, &kmsg->msg_iter); 2272 return err < 0 ? err : 0; 2273 } 2274 2275 static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys, 2276 unsigned int flags, struct used_address *used_address, 2277 unsigned int allowed_msghdr_flags) 2278 { 2279 unsigned char ctl[sizeof(struct cmsghdr) + 20] 2280 __aligned(sizeof(__kernel_size_t)); 2281 /* 20 is size of ipv6_pktinfo */ 2282 unsigned char *ctl_buf = ctl; 2283 int ctl_len; 2284 ssize_t err; 2285 2286 err = -ENOBUFS; 2287 2288 if (msg_sys->msg_controllen > INT_MAX) 2289 goto out; 2290 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 2291 ctl_len = msg_sys->msg_controllen; 2292 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 2293 err = 2294 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 2295 sizeof(ctl)); 2296 if (err) 2297 goto out; 2298 ctl_buf = msg_sys->msg_control; 2299 ctl_len = msg_sys->msg_controllen; 2300 } else if (ctl_len) { 2301 BUILD_BUG_ON(sizeof(struct cmsghdr) != 2302 CMSG_ALIGN(sizeof(struct cmsghdr))); 2303 if (ctl_len > sizeof(ctl)) { 2304 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 2305 if (ctl_buf == NULL) 2306 goto out; 2307 } 2308 err = -EFAULT; 2309 if (copy_from_user(ctl_buf, msg_sys->msg_control_user, ctl_len)) 2310 goto out_freectl; 2311 msg_sys->msg_control = ctl_buf; 2312 msg_sys->msg_control_is_user = false; 2313 } 2314 msg_sys->msg_flags = flags; 2315 2316 if (sock->file->f_flags & O_NONBLOCK) 2317 msg_sys->msg_flags |= MSG_DONTWAIT; 2318 /* 2319 * If this is sendmmsg() and current destination address is same as 2320 * previously succeeded address, omit asking LSM's decision. 2321 * used_address->name_len is initialized to UINT_MAX so that the first 2322 * destination address never matches. 2323 */ 2324 if (used_address && msg_sys->msg_name && 2325 used_address->name_len == msg_sys->msg_namelen && 2326 !memcmp(&used_address->name, msg_sys->msg_name, 2327 used_address->name_len)) { 2328 err = sock_sendmsg_nosec(sock, msg_sys); 2329 goto out_freectl; 2330 } 2331 err = sock_sendmsg(sock, msg_sys); 2332 /* 2333 * If this is sendmmsg() and sending to current destination address was 2334 * successful, remember it. 2335 */ 2336 if (used_address && err >= 0) { 2337 used_address->name_len = msg_sys->msg_namelen; 2338 if (msg_sys->msg_name) 2339 memcpy(&used_address->name, msg_sys->msg_name, 2340 used_address->name_len); 2341 } 2342 2343 out_freectl: 2344 if (ctl_buf != ctl) 2345 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2346 out: 2347 return err; 2348 } 2349 2350 int sendmsg_copy_msghdr(struct msghdr *msg, 2351 struct user_msghdr __user *umsg, unsigned flags, 2352 struct iovec **iov) 2353 { 2354 int err; 2355 2356 if (flags & MSG_CMSG_COMPAT) { 2357 struct compat_msghdr __user *msg_compat; 2358 2359 msg_compat = (struct compat_msghdr __user *) umsg; 2360 err = get_compat_msghdr(msg, msg_compat, NULL, iov); 2361 } else { 2362 err = copy_msghdr_from_user(msg, umsg, NULL, iov); 2363 } 2364 if (err < 0) 2365 return err; 2366 2367 return 0; 2368 } 2369 2370 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 2371 struct msghdr *msg_sys, unsigned int flags, 2372 struct used_address *used_address, 2373 unsigned int allowed_msghdr_flags) 2374 { 2375 struct sockaddr_storage address; 2376 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2377 ssize_t err; 2378 2379 msg_sys->msg_name = &address; 2380 2381 err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov); 2382 if (err < 0) 2383 return err; 2384 2385 err = ____sys_sendmsg(sock, msg_sys, flags, used_address, 2386 allowed_msghdr_flags); 2387 kfree(iov); 2388 return err; 2389 } 2390 2391 /* 2392 * BSD sendmsg interface 2393 */ 2394 long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg, 2395 unsigned int flags) 2396 { 2397 /* disallow ancillary data requests from this path */ 2398 if (msg->msg_control || msg->msg_controllen) 2399 return -EINVAL; 2400 2401 return ____sys_sendmsg(sock, msg, flags, NULL, 0); 2402 } 2403 2404 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2405 bool forbid_cmsg_compat) 2406 { 2407 int fput_needed, err; 2408 struct msghdr msg_sys; 2409 struct socket *sock; 2410 2411 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2412 return -EINVAL; 2413 2414 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2415 if (!sock) 2416 goto out; 2417 2418 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2419 2420 fput_light(sock->file, fput_needed); 2421 out: 2422 return err; 2423 } 2424 2425 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2426 { 2427 return __sys_sendmsg(fd, msg, flags, true); 2428 } 2429 2430 /* 2431 * Linux sendmmsg interface 2432 */ 2433 2434 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2435 unsigned int flags, bool forbid_cmsg_compat) 2436 { 2437 int fput_needed, err, datagrams; 2438 struct socket *sock; 2439 struct mmsghdr __user *entry; 2440 struct compat_mmsghdr __user *compat_entry; 2441 struct msghdr msg_sys; 2442 struct used_address used_address; 2443 unsigned int oflags = flags; 2444 2445 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2446 return -EINVAL; 2447 2448 if (vlen > UIO_MAXIOV) 2449 vlen = UIO_MAXIOV; 2450 2451 datagrams = 0; 2452 2453 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2454 if (!sock) 2455 return err; 2456 2457 used_address.name_len = UINT_MAX; 2458 entry = mmsg; 2459 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2460 err = 0; 2461 flags |= MSG_BATCH; 2462 2463 while (datagrams < vlen) { 2464 if (datagrams == vlen - 1) 2465 flags = oflags; 2466 2467 if (MSG_CMSG_COMPAT & flags) { 2468 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2469 &msg_sys, flags, &used_address, MSG_EOR); 2470 if (err < 0) 2471 break; 2472 err = __put_user(err, &compat_entry->msg_len); 2473 ++compat_entry; 2474 } else { 2475 err = ___sys_sendmsg(sock, 2476 (struct user_msghdr __user *)entry, 2477 &msg_sys, flags, &used_address, MSG_EOR); 2478 if (err < 0) 2479 break; 2480 err = put_user(err, &entry->msg_len); 2481 ++entry; 2482 } 2483 2484 if (err) 2485 break; 2486 ++datagrams; 2487 if (msg_data_left(&msg_sys)) 2488 break; 2489 cond_resched(); 2490 } 2491 2492 fput_light(sock->file, fput_needed); 2493 2494 /* We only return an error if no datagrams were able to be sent */ 2495 if (datagrams != 0) 2496 return datagrams; 2497 2498 return err; 2499 } 2500 2501 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2502 unsigned int, vlen, unsigned int, flags) 2503 { 2504 return __sys_sendmmsg(fd, mmsg, vlen, flags, true); 2505 } 2506 2507 int recvmsg_copy_msghdr(struct msghdr *msg, 2508 struct user_msghdr __user *umsg, unsigned flags, 2509 struct sockaddr __user **uaddr, 2510 struct iovec **iov) 2511 { 2512 ssize_t err; 2513 2514 if (MSG_CMSG_COMPAT & flags) { 2515 struct compat_msghdr __user *msg_compat; 2516 2517 msg_compat = (struct compat_msghdr __user *) umsg; 2518 err = get_compat_msghdr(msg, msg_compat, uaddr, iov); 2519 } else { 2520 err = copy_msghdr_from_user(msg, umsg, uaddr, iov); 2521 } 2522 if (err < 0) 2523 return err; 2524 2525 return 0; 2526 } 2527 2528 static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys, 2529 struct user_msghdr __user *msg, 2530 struct sockaddr __user *uaddr, 2531 unsigned int flags, int nosec) 2532 { 2533 struct compat_msghdr __user *msg_compat = 2534 (struct compat_msghdr __user *) msg; 2535 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2536 struct sockaddr_storage addr; 2537 unsigned long cmsg_ptr; 2538 int len; 2539 ssize_t err; 2540 2541 msg_sys->msg_name = &addr; 2542 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2543 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2544 2545 /* We assume all kernel code knows the size of sockaddr_storage */ 2546 msg_sys->msg_namelen = 0; 2547 2548 if (sock->file->f_flags & O_NONBLOCK) 2549 flags |= MSG_DONTWAIT; 2550 2551 if (unlikely(nosec)) 2552 err = sock_recvmsg_nosec(sock, msg_sys, flags); 2553 else 2554 err = sock_recvmsg(sock, msg_sys, flags); 2555 2556 if (err < 0) 2557 goto out; 2558 len = err; 2559 2560 if (uaddr != NULL) { 2561 err = move_addr_to_user(&addr, 2562 msg_sys->msg_namelen, uaddr, 2563 uaddr_len); 2564 if (err < 0) 2565 goto out; 2566 } 2567 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2568 COMPAT_FLAGS(msg)); 2569 if (err) 2570 goto out; 2571 if (MSG_CMSG_COMPAT & flags) 2572 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2573 &msg_compat->msg_controllen); 2574 else 2575 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2576 &msg->msg_controllen); 2577 if (err) 2578 goto out; 2579 err = len; 2580 out: 2581 return err; 2582 } 2583 2584 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2585 struct msghdr *msg_sys, unsigned int flags, int nosec) 2586 { 2587 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 2588 /* user mode address pointers */ 2589 struct sockaddr __user *uaddr; 2590 ssize_t err; 2591 2592 err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov); 2593 if (err < 0) 2594 return err; 2595 2596 err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec); 2597 kfree(iov); 2598 return err; 2599 } 2600 2601 /* 2602 * BSD recvmsg interface 2603 */ 2604 2605 long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg, 2606 struct user_msghdr __user *umsg, 2607 struct sockaddr __user *uaddr, unsigned int flags) 2608 { 2609 if (msg->msg_control || msg->msg_controllen) { 2610 /* disallow ancillary data reqs unless cmsg is plain data */ 2611 if (!(sock->ops->flags & PROTO_CMSG_DATA_ONLY)) 2612 return -EINVAL; 2613 } 2614 2615 return ____sys_recvmsg(sock, msg, umsg, uaddr, flags, 0); 2616 } 2617 2618 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, 2619 bool forbid_cmsg_compat) 2620 { 2621 int fput_needed, err; 2622 struct msghdr msg_sys; 2623 struct socket *sock; 2624 2625 if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) 2626 return -EINVAL; 2627 2628 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2629 if (!sock) 2630 goto out; 2631 2632 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2633 2634 fput_light(sock->file, fput_needed); 2635 out: 2636 return err; 2637 } 2638 2639 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2640 unsigned int, flags) 2641 { 2642 return __sys_recvmsg(fd, msg, flags, true); 2643 } 2644 2645 /* 2646 * Linux recvmmsg interface 2647 */ 2648 2649 static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2650 unsigned int vlen, unsigned int flags, 2651 struct timespec64 *timeout) 2652 { 2653 int fput_needed, err, datagrams; 2654 struct socket *sock; 2655 struct mmsghdr __user *entry; 2656 struct compat_mmsghdr __user *compat_entry; 2657 struct msghdr msg_sys; 2658 struct timespec64 end_time; 2659 struct timespec64 timeout64; 2660 2661 if (timeout && 2662 poll_select_set_timeout(&end_time, timeout->tv_sec, 2663 timeout->tv_nsec)) 2664 return -EINVAL; 2665 2666 datagrams = 0; 2667 2668 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2669 if (!sock) 2670 return err; 2671 2672 if (likely(!(flags & MSG_ERRQUEUE))) { 2673 err = sock_error(sock->sk); 2674 if (err) { 2675 datagrams = err; 2676 goto out_put; 2677 } 2678 } 2679 2680 entry = mmsg; 2681 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2682 2683 while (datagrams < vlen) { 2684 /* 2685 * No need to ask LSM for more than the first datagram. 2686 */ 2687 if (MSG_CMSG_COMPAT & flags) { 2688 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2689 &msg_sys, flags & ~MSG_WAITFORONE, 2690 datagrams); 2691 if (err < 0) 2692 break; 2693 err = __put_user(err, &compat_entry->msg_len); 2694 ++compat_entry; 2695 } else { 2696 err = ___sys_recvmsg(sock, 2697 (struct user_msghdr __user *)entry, 2698 &msg_sys, flags & ~MSG_WAITFORONE, 2699 datagrams); 2700 if (err < 0) 2701 break; 2702 err = put_user(err, &entry->msg_len); 2703 ++entry; 2704 } 2705 2706 if (err) 2707 break; 2708 ++datagrams; 2709 2710 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2711 if (flags & MSG_WAITFORONE) 2712 flags |= MSG_DONTWAIT; 2713 2714 if (timeout) { 2715 ktime_get_ts64(&timeout64); 2716 *timeout = timespec64_sub(end_time, timeout64); 2717 if (timeout->tv_sec < 0) { 2718 timeout->tv_sec = timeout->tv_nsec = 0; 2719 break; 2720 } 2721 2722 /* Timeout, return less than vlen datagrams */ 2723 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2724 break; 2725 } 2726 2727 /* Out of band data, return right away */ 2728 if (msg_sys.msg_flags & MSG_OOB) 2729 break; 2730 cond_resched(); 2731 } 2732 2733 if (err == 0) 2734 goto out_put; 2735 2736 if (datagrams == 0) { 2737 datagrams = err; 2738 goto out_put; 2739 } 2740 2741 /* 2742 * We may return less entries than requested (vlen) if the 2743 * sock is non block and there aren't enough datagrams... 2744 */ 2745 if (err != -EAGAIN) { 2746 /* 2747 * ... or if recvmsg returns an error after we 2748 * received some datagrams, where we record the 2749 * error to return on the next call or if the 2750 * app asks about it using getsockopt(SO_ERROR). 2751 */ 2752 sock->sk->sk_err = -err; 2753 } 2754 out_put: 2755 fput_light(sock->file, fput_needed); 2756 2757 return datagrams; 2758 } 2759 2760 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, 2761 unsigned int vlen, unsigned int flags, 2762 struct __kernel_timespec __user *timeout, 2763 struct old_timespec32 __user *timeout32) 2764 { 2765 int datagrams; 2766 struct timespec64 timeout_sys; 2767 2768 if (timeout && get_timespec64(&timeout_sys, timeout)) 2769 return -EFAULT; 2770 2771 if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) 2772 return -EFAULT; 2773 2774 if (!timeout && !timeout32) 2775 return do_recvmmsg(fd, mmsg, vlen, flags, NULL); 2776 2777 datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2778 2779 if (datagrams <= 0) 2780 return datagrams; 2781 2782 if (timeout && put_timespec64(&timeout_sys, timeout)) 2783 datagrams = -EFAULT; 2784 2785 if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) 2786 datagrams = -EFAULT; 2787 2788 return datagrams; 2789 } 2790 2791 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2792 unsigned int, vlen, unsigned int, flags, 2793 struct __kernel_timespec __user *, timeout) 2794 { 2795 if (flags & MSG_CMSG_COMPAT) 2796 return -EINVAL; 2797 2798 return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); 2799 } 2800 2801 #ifdef CONFIG_COMPAT_32BIT_TIME 2802 SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, 2803 unsigned int, vlen, unsigned int, flags, 2804 struct old_timespec32 __user *, timeout) 2805 { 2806 if (flags & MSG_CMSG_COMPAT) 2807 return -EINVAL; 2808 2809 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); 2810 } 2811 #endif 2812 2813 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2814 /* Argument list sizes for sys_socketcall */ 2815 #define AL(x) ((x) * sizeof(unsigned long)) 2816 static const unsigned char nargs[21] = { 2817 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2818 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2819 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2820 AL(4), AL(5), AL(4) 2821 }; 2822 2823 #undef AL 2824 2825 /* 2826 * System call vectors. 2827 * 2828 * Argument checking cleaned up. Saved 20% in size. 2829 * This function doesn't need to set the kernel lock because 2830 * it is set by the callees. 2831 */ 2832 2833 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2834 { 2835 unsigned long a[AUDITSC_ARGS]; 2836 unsigned long a0, a1; 2837 int err; 2838 unsigned int len; 2839 2840 if (call < 1 || call > SYS_SENDMMSG) 2841 return -EINVAL; 2842 call = array_index_nospec(call, SYS_SENDMMSG + 1); 2843 2844 len = nargs[call]; 2845 if (len > sizeof(a)) 2846 return -EINVAL; 2847 2848 /* copy_from_user should be SMP safe. */ 2849 if (copy_from_user(a, args, len)) 2850 return -EFAULT; 2851 2852 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2853 if (err) 2854 return err; 2855 2856 a0 = a[0]; 2857 a1 = a[1]; 2858 2859 switch (call) { 2860 case SYS_SOCKET: 2861 err = __sys_socket(a0, a1, a[2]); 2862 break; 2863 case SYS_BIND: 2864 err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2865 break; 2866 case SYS_CONNECT: 2867 err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2868 break; 2869 case SYS_LISTEN: 2870 err = __sys_listen(a0, a1); 2871 break; 2872 case SYS_ACCEPT: 2873 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2874 (int __user *)a[2], 0); 2875 break; 2876 case SYS_GETSOCKNAME: 2877 err = 2878 __sys_getsockname(a0, (struct sockaddr __user *)a1, 2879 (int __user *)a[2]); 2880 break; 2881 case SYS_GETPEERNAME: 2882 err = 2883 __sys_getpeername(a0, (struct sockaddr __user *)a1, 2884 (int __user *)a[2]); 2885 break; 2886 case SYS_SOCKETPAIR: 2887 err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2888 break; 2889 case SYS_SEND: 2890 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2891 NULL, 0); 2892 break; 2893 case SYS_SENDTO: 2894 err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], 2895 (struct sockaddr __user *)a[4], a[5]); 2896 break; 2897 case SYS_RECV: 2898 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2899 NULL, NULL); 2900 break; 2901 case SYS_RECVFROM: 2902 err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2903 (struct sockaddr __user *)a[4], 2904 (int __user *)a[5]); 2905 break; 2906 case SYS_SHUTDOWN: 2907 err = __sys_shutdown(a0, a1); 2908 break; 2909 case SYS_SETSOCKOPT: 2910 err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], 2911 a[4]); 2912 break; 2913 case SYS_GETSOCKOPT: 2914 err = 2915 __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2916 (int __user *)a[4]); 2917 break; 2918 case SYS_SENDMSG: 2919 err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, 2920 a[2], true); 2921 break; 2922 case SYS_SENDMMSG: 2923 err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], 2924 a[3], true); 2925 break; 2926 case SYS_RECVMSG: 2927 err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, 2928 a[2], true); 2929 break; 2930 case SYS_RECVMMSG: 2931 if (IS_ENABLED(CONFIG_64BIT)) 2932 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 2933 a[2], a[3], 2934 (struct __kernel_timespec __user *)a[4], 2935 NULL); 2936 else 2937 err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, 2938 a[2], a[3], NULL, 2939 (struct old_timespec32 __user *)a[4]); 2940 break; 2941 case SYS_ACCEPT4: 2942 err = __sys_accept4(a0, (struct sockaddr __user *)a1, 2943 (int __user *)a[2], a[3]); 2944 break; 2945 default: 2946 err = -EINVAL; 2947 break; 2948 } 2949 return err; 2950 } 2951 2952 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2953 2954 /** 2955 * sock_register - add a socket protocol handler 2956 * @ops: description of protocol 2957 * 2958 * This function is called by a protocol handler that wants to 2959 * advertise its address family, and have it linked into the 2960 * socket interface. The value ops->family corresponds to the 2961 * socket system call protocol family. 2962 */ 2963 int sock_register(const struct net_proto_family *ops) 2964 { 2965 int err; 2966 2967 if (ops->family >= NPROTO) { 2968 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2969 return -ENOBUFS; 2970 } 2971 2972 spin_lock(&net_family_lock); 2973 if (rcu_dereference_protected(net_families[ops->family], 2974 lockdep_is_held(&net_family_lock))) 2975 err = -EEXIST; 2976 else { 2977 rcu_assign_pointer(net_families[ops->family], ops); 2978 err = 0; 2979 } 2980 spin_unlock(&net_family_lock); 2981 2982 pr_info("NET: Registered protocol family %d\n", ops->family); 2983 return err; 2984 } 2985 EXPORT_SYMBOL(sock_register); 2986 2987 /** 2988 * sock_unregister - remove a protocol handler 2989 * @family: protocol family to remove 2990 * 2991 * This function is called by a protocol handler that wants to 2992 * remove its address family, and have it unlinked from the 2993 * new socket creation. 2994 * 2995 * If protocol handler is a module, then it can use module reference 2996 * counts to protect against new references. If protocol handler is not 2997 * a module then it needs to provide its own protection in 2998 * the ops->create routine. 2999 */ 3000 void sock_unregister(int family) 3001 { 3002 BUG_ON(family < 0 || family >= NPROTO); 3003 3004 spin_lock(&net_family_lock); 3005 RCU_INIT_POINTER(net_families[family], NULL); 3006 spin_unlock(&net_family_lock); 3007 3008 synchronize_rcu(); 3009 3010 pr_info("NET: Unregistered protocol family %d\n", family); 3011 } 3012 EXPORT_SYMBOL(sock_unregister); 3013 3014 bool sock_is_registered(int family) 3015 { 3016 return family < NPROTO && rcu_access_pointer(net_families[family]); 3017 } 3018 3019 static int __init sock_init(void) 3020 { 3021 int err; 3022 /* 3023 * Initialize the network sysctl infrastructure. 3024 */ 3025 err = net_sysctl_init(); 3026 if (err) 3027 goto out; 3028 3029 /* 3030 * Initialize skbuff SLAB cache 3031 */ 3032 skb_init(); 3033 3034 /* 3035 * Initialize the protocols module. 3036 */ 3037 3038 init_inodecache(); 3039 3040 err = register_filesystem(&sock_fs_type); 3041 if (err) 3042 goto out; 3043 sock_mnt = kern_mount(&sock_fs_type); 3044 if (IS_ERR(sock_mnt)) { 3045 err = PTR_ERR(sock_mnt); 3046 goto out_mount; 3047 } 3048 3049 /* The real protocol initialization is performed in later initcalls. 3050 */ 3051 3052 #ifdef CONFIG_NETFILTER 3053 err = netfilter_init(); 3054 if (err) 3055 goto out; 3056 #endif 3057 3058 ptp_classifier_init(); 3059 3060 out: 3061 return err; 3062 3063 out_mount: 3064 unregister_filesystem(&sock_fs_type); 3065 goto out; 3066 } 3067 3068 core_initcall(sock_init); /* early initcall */ 3069 3070 #ifdef CONFIG_PROC_FS 3071 void socket_seq_show(struct seq_file *seq) 3072 { 3073 seq_printf(seq, "sockets: used %d\n", 3074 sock_inuse_get(seq->private)); 3075 } 3076 #endif /* CONFIG_PROC_FS */ 3077 3078 #ifdef CONFIG_COMPAT 3079 static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 3080 { 3081 struct compat_ifconf ifc32; 3082 struct ifconf ifc; 3083 int err; 3084 3085 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 3086 return -EFAULT; 3087 3088 ifc.ifc_len = ifc32.ifc_len; 3089 ifc.ifc_req = compat_ptr(ifc32.ifcbuf); 3090 3091 rtnl_lock(); 3092 err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); 3093 rtnl_unlock(); 3094 if (err) 3095 return err; 3096 3097 ifc32.ifc_len = ifc.ifc_len; 3098 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 3099 return -EFAULT; 3100 3101 return 0; 3102 } 3103 3104 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 3105 { 3106 struct compat_ethtool_rxnfc __user *compat_rxnfc; 3107 bool convert_in = false, convert_out = false; 3108 size_t buf_size = 0; 3109 struct ethtool_rxnfc __user *rxnfc = NULL; 3110 struct ifreq ifr; 3111 u32 rule_cnt = 0, actual_rule_cnt; 3112 u32 ethcmd; 3113 u32 data; 3114 int ret; 3115 3116 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 3117 return -EFAULT; 3118 3119 compat_rxnfc = compat_ptr(data); 3120 3121 if (get_user(ethcmd, &compat_rxnfc->cmd)) 3122 return -EFAULT; 3123 3124 /* Most ethtool structures are defined without padding. 3125 * Unfortunately struct ethtool_rxnfc is an exception. 3126 */ 3127 switch (ethcmd) { 3128 default: 3129 break; 3130 case ETHTOOL_GRXCLSRLALL: 3131 /* Buffer size is variable */ 3132 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 3133 return -EFAULT; 3134 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 3135 return -ENOMEM; 3136 buf_size += rule_cnt * sizeof(u32); 3137 fallthrough; 3138 case ETHTOOL_GRXRINGS: 3139 case ETHTOOL_GRXCLSRLCNT: 3140 case ETHTOOL_GRXCLSRULE: 3141 case ETHTOOL_SRXCLSRLINS: 3142 convert_out = true; 3143 fallthrough; 3144 case ETHTOOL_SRXCLSRLDEL: 3145 buf_size += sizeof(struct ethtool_rxnfc); 3146 convert_in = true; 3147 rxnfc = compat_alloc_user_space(buf_size); 3148 break; 3149 } 3150 3151 if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 3152 return -EFAULT; 3153 3154 ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; 3155 3156 if (convert_in) { 3157 /* We expect there to be holes between fs.m_ext and 3158 * fs.ring_cookie and at the end of fs, but nowhere else. 3159 */ 3160 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 3161 sizeof(compat_rxnfc->fs.m_ext) != 3162 offsetof(struct ethtool_rxnfc, fs.m_ext) + 3163 sizeof(rxnfc->fs.m_ext)); 3164 BUILD_BUG_ON( 3165 offsetof(struct compat_ethtool_rxnfc, fs.location) - 3166 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 3167 offsetof(struct ethtool_rxnfc, fs.location) - 3168 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 3169 3170 if (copy_in_user(rxnfc, compat_rxnfc, 3171 (void __user *)(&rxnfc->fs.m_ext + 1) - 3172 (void __user *)rxnfc) || 3173 copy_in_user(&rxnfc->fs.ring_cookie, 3174 &compat_rxnfc->fs.ring_cookie, 3175 (void __user *)(&rxnfc->fs.location + 1) - 3176 (void __user *)&rxnfc->fs.ring_cookie)) 3177 return -EFAULT; 3178 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 3179 if (put_user(rule_cnt, &rxnfc->rule_cnt)) 3180 return -EFAULT; 3181 } else if (copy_in_user(&rxnfc->rule_cnt, 3182 &compat_rxnfc->rule_cnt, 3183 sizeof(rxnfc->rule_cnt))) 3184 return -EFAULT; 3185 } 3186 3187 ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); 3188 if (ret) 3189 return ret; 3190 3191 if (convert_out) { 3192 if (copy_in_user(compat_rxnfc, rxnfc, 3193 (const void __user *)(&rxnfc->fs.m_ext + 1) - 3194 (const void __user *)rxnfc) || 3195 copy_in_user(&compat_rxnfc->fs.ring_cookie, 3196 &rxnfc->fs.ring_cookie, 3197 (const void __user *)(&rxnfc->fs.location + 1) - 3198 (const void __user *)&rxnfc->fs.ring_cookie) || 3199 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 3200 sizeof(rxnfc->rule_cnt))) 3201 return -EFAULT; 3202 3203 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 3204 /* As an optimisation, we only copy the actual 3205 * number of rules that the underlying 3206 * function returned. Since Mallory might 3207 * change the rule count in user memory, we 3208 * check that it is less than the rule count 3209 * originally given (as the user buffer size), 3210 * which has been range-checked. 3211 */ 3212 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 3213 return -EFAULT; 3214 if (actual_rule_cnt < rule_cnt) 3215 rule_cnt = actual_rule_cnt; 3216 if (copy_in_user(&compat_rxnfc->rule_locs[0], 3217 &rxnfc->rule_locs[0], 3218 rule_cnt * sizeof(u32))) 3219 return -EFAULT; 3220 } 3221 } 3222 3223 return 0; 3224 } 3225 3226 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 3227 { 3228 compat_uptr_t uptr32; 3229 struct ifreq ifr; 3230 void __user *saved; 3231 int err; 3232 3233 if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) 3234 return -EFAULT; 3235 3236 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 3237 return -EFAULT; 3238 3239 saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; 3240 ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); 3241 3242 err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); 3243 if (!err) { 3244 ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; 3245 if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) 3246 err = -EFAULT; 3247 } 3248 return err; 3249 } 3250 3251 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 3252 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 3253 struct compat_ifreq __user *u_ifreq32) 3254 { 3255 struct ifreq ifreq; 3256 u32 data32; 3257 3258 if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) 3259 return -EFAULT; 3260 if (get_user(data32, &u_ifreq32->ifr_data)) 3261 return -EFAULT; 3262 ifreq.ifr_data = compat_ptr(data32); 3263 3264 return dev_ioctl(net, cmd, &ifreq, NULL); 3265 } 3266 3267 static int compat_ifreq_ioctl(struct net *net, struct socket *sock, 3268 unsigned int cmd, 3269 struct compat_ifreq __user *uifr32) 3270 { 3271 struct ifreq __user *uifr; 3272 int err; 3273 3274 /* Handle the fact that while struct ifreq has the same *layout* on 3275 * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, 3276 * which are handled elsewhere, it still has different *size* due to 3277 * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, 3278 * resulting in struct ifreq being 32 and 40 bytes respectively). 3279 * As a result, if the struct happens to be at the end of a page and 3280 * the next page isn't readable/writable, we get a fault. To prevent 3281 * that, copy back and forth to the full size. 3282 */ 3283 3284 uifr = compat_alloc_user_space(sizeof(*uifr)); 3285 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 3286 return -EFAULT; 3287 3288 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 3289 3290 if (!err) { 3291 switch (cmd) { 3292 case SIOCGIFFLAGS: 3293 case SIOCGIFMETRIC: 3294 case SIOCGIFMTU: 3295 case SIOCGIFMEM: 3296 case SIOCGIFHWADDR: 3297 case SIOCGIFINDEX: 3298 case SIOCGIFADDR: 3299 case SIOCGIFBRDADDR: 3300 case SIOCGIFDSTADDR: 3301 case SIOCGIFNETMASK: 3302 case SIOCGIFPFLAGS: 3303 case SIOCGIFTXQLEN: 3304 case SIOCGMIIPHY: 3305 case SIOCGMIIREG: 3306 case SIOCGIFNAME: 3307 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 3308 err = -EFAULT; 3309 break; 3310 } 3311 } 3312 return err; 3313 } 3314 3315 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 3316 struct compat_ifreq __user *uifr32) 3317 { 3318 struct ifreq ifr; 3319 struct compat_ifmap __user *uifmap32; 3320 int err; 3321 3322 uifmap32 = &uifr32->ifr_ifru.ifru_map; 3323 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 3324 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3325 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3326 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3327 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 3328 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 3329 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 3330 if (err) 3331 return -EFAULT; 3332 3333 err = dev_ioctl(net, cmd, &ifr, NULL); 3334 3335 if (cmd == SIOCGIFMAP && !err) { 3336 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 3337 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 3338 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 3339 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 3340 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 3341 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 3342 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 3343 if (err) 3344 err = -EFAULT; 3345 } 3346 return err; 3347 } 3348 3349 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3350 * for some operations; this forces use of the newer bridge-utils that 3351 * use compatible ioctls 3352 */ 3353 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3354 { 3355 compat_ulong_t tmp; 3356 3357 if (get_user(tmp, argp)) 3358 return -EFAULT; 3359 if (tmp == BRCTL_GET_VERSION) 3360 return BRCTL_VERSION + 1; 3361 return -EINVAL; 3362 } 3363 3364 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3365 unsigned int cmd, unsigned long arg) 3366 { 3367 void __user *argp = compat_ptr(arg); 3368 struct sock *sk = sock->sk; 3369 struct net *net = sock_net(sk); 3370 3371 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3372 return compat_ifr_data_ioctl(net, cmd, argp); 3373 3374 switch (cmd) { 3375 case SIOCSIFBR: 3376 case SIOCGIFBR: 3377 return old_bridge_ioctl(argp); 3378 case SIOCGIFCONF: 3379 return compat_dev_ifconf(net, argp); 3380 case SIOCETHTOOL: 3381 return ethtool_ioctl(net, argp); 3382 case SIOCWANDEV: 3383 return compat_siocwandev(net, argp); 3384 case SIOCGIFMAP: 3385 case SIOCSIFMAP: 3386 return compat_sioc_ifmap(net, cmd, argp); 3387 case SIOCGSTAMP_OLD: 3388 case SIOCGSTAMPNS_OLD: 3389 if (!sock->ops->gettstamp) 3390 return -ENOIOCTLCMD; 3391 return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, 3392 !COMPAT_USE_64BIT_TIME); 3393 3394 case SIOCBONDSLAVEINFOQUERY: 3395 case SIOCBONDINFOQUERY: 3396 case SIOCSHWTSTAMP: 3397 case SIOCGHWTSTAMP: 3398 return compat_ifr_data_ioctl(net, cmd, argp); 3399 3400 case FIOSETOWN: 3401 case SIOCSPGRP: 3402 case FIOGETOWN: 3403 case SIOCGPGRP: 3404 case SIOCBRADDBR: 3405 case SIOCBRDELBR: 3406 case SIOCGIFVLAN: 3407 case SIOCSIFVLAN: 3408 case SIOCGSKNS: 3409 case SIOCGSTAMP_NEW: 3410 case SIOCGSTAMPNS_NEW: 3411 return sock_ioctl(file, cmd, arg); 3412 3413 case SIOCGIFFLAGS: 3414 case SIOCSIFFLAGS: 3415 case SIOCGIFMETRIC: 3416 case SIOCSIFMETRIC: 3417 case SIOCGIFMTU: 3418 case SIOCSIFMTU: 3419 case SIOCGIFMEM: 3420 case SIOCSIFMEM: 3421 case SIOCGIFHWADDR: 3422 case SIOCSIFHWADDR: 3423 case SIOCADDMULTI: 3424 case SIOCDELMULTI: 3425 case SIOCGIFINDEX: 3426 case SIOCGIFADDR: 3427 case SIOCSIFADDR: 3428 case SIOCSIFHWBROADCAST: 3429 case SIOCDIFADDR: 3430 case SIOCGIFBRDADDR: 3431 case SIOCSIFBRDADDR: 3432 case SIOCGIFDSTADDR: 3433 case SIOCSIFDSTADDR: 3434 case SIOCGIFNETMASK: 3435 case SIOCSIFNETMASK: 3436 case SIOCSIFPFLAGS: 3437 case SIOCGIFPFLAGS: 3438 case SIOCGIFTXQLEN: 3439 case SIOCSIFTXQLEN: 3440 case SIOCBRADDIF: 3441 case SIOCBRDELIF: 3442 case SIOCGIFNAME: 3443 case SIOCSIFNAME: 3444 case SIOCGMIIPHY: 3445 case SIOCGMIIREG: 3446 case SIOCSMIIREG: 3447 case SIOCBONDENSLAVE: 3448 case SIOCBONDRELEASE: 3449 case SIOCBONDSETHWADDR: 3450 case SIOCBONDCHANGEACTIVE: 3451 return compat_ifreq_ioctl(net, sock, cmd, argp); 3452 3453 case SIOCSARP: 3454 case SIOCGARP: 3455 case SIOCDARP: 3456 case SIOCOUTQ: 3457 case SIOCOUTQNSD: 3458 case SIOCATMARK: 3459 return sock_do_ioctl(net, sock, cmd, arg); 3460 } 3461 3462 return -ENOIOCTLCMD; 3463 } 3464 3465 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3466 unsigned long arg) 3467 { 3468 struct socket *sock = file->private_data; 3469 int ret = -ENOIOCTLCMD; 3470 struct sock *sk; 3471 struct net *net; 3472 3473 sk = sock->sk; 3474 net = sock_net(sk); 3475 3476 if (sock->ops->compat_ioctl) 3477 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3478 3479 if (ret == -ENOIOCTLCMD && 3480 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3481 ret = compat_wext_handle_ioctl(net, cmd, arg); 3482 3483 if (ret == -ENOIOCTLCMD) 3484 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3485 3486 return ret; 3487 } 3488 #endif 3489 3490 /** 3491 * kernel_bind - bind an address to a socket (kernel space) 3492 * @sock: socket 3493 * @addr: address 3494 * @addrlen: length of address 3495 * 3496 * Returns 0 or an error. 3497 */ 3498 3499 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3500 { 3501 return sock->ops->bind(sock, addr, addrlen); 3502 } 3503 EXPORT_SYMBOL(kernel_bind); 3504 3505 /** 3506 * kernel_listen - move socket to listening state (kernel space) 3507 * @sock: socket 3508 * @backlog: pending connections queue size 3509 * 3510 * Returns 0 or an error. 3511 */ 3512 3513 int kernel_listen(struct socket *sock, int backlog) 3514 { 3515 return sock->ops->listen(sock, backlog); 3516 } 3517 EXPORT_SYMBOL(kernel_listen); 3518 3519 /** 3520 * kernel_accept - accept a connection (kernel space) 3521 * @sock: listening socket 3522 * @newsock: new connected socket 3523 * @flags: flags 3524 * 3525 * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. 3526 * If it fails, @newsock is guaranteed to be %NULL. 3527 * Returns 0 or an error. 3528 */ 3529 3530 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3531 { 3532 struct sock *sk = sock->sk; 3533 int err; 3534 3535 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3536 newsock); 3537 if (err < 0) 3538 goto done; 3539 3540 err = sock->ops->accept(sock, *newsock, flags, true); 3541 if (err < 0) { 3542 sock_release(*newsock); 3543 *newsock = NULL; 3544 goto done; 3545 } 3546 3547 (*newsock)->ops = sock->ops; 3548 __module_get((*newsock)->ops->owner); 3549 3550 done: 3551 return err; 3552 } 3553 EXPORT_SYMBOL(kernel_accept); 3554 3555 /** 3556 * kernel_connect - connect a socket (kernel space) 3557 * @sock: socket 3558 * @addr: address 3559 * @addrlen: address length 3560 * @flags: flags (O_NONBLOCK, ...) 3561 * 3562 * For datagram sockets, @addr is the addres to which datagrams are sent 3563 * by default, and the only address from which datagrams are received. 3564 * For stream sockets, attempts to connect to @addr. 3565 * Returns 0 or an error code. 3566 */ 3567 3568 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3569 int flags) 3570 { 3571 return sock->ops->connect(sock, addr, addrlen, flags); 3572 } 3573 EXPORT_SYMBOL(kernel_connect); 3574 3575 /** 3576 * kernel_getsockname - get the address which the socket is bound (kernel space) 3577 * @sock: socket 3578 * @addr: address holder 3579 * 3580 * Fills the @addr pointer with the address which the socket is bound. 3581 * Returns 0 or an error code. 3582 */ 3583 3584 int kernel_getsockname(struct socket *sock, struct sockaddr *addr) 3585 { 3586 return sock->ops->getname(sock, addr, 0); 3587 } 3588 EXPORT_SYMBOL(kernel_getsockname); 3589 3590 /** 3591 * kernel_getpeername - get the address which the socket is connected (kernel space) 3592 * @sock: socket 3593 * @addr: address holder 3594 * 3595 * Fills the @addr pointer with the address which the socket is connected. 3596 * Returns 0 or an error code. 3597 */ 3598 3599 int kernel_getpeername(struct socket *sock, struct sockaddr *addr) 3600 { 3601 return sock->ops->getname(sock, addr, 1); 3602 } 3603 EXPORT_SYMBOL(kernel_getpeername); 3604 3605 /** 3606 * kernel_sendpage - send a &page through a socket (kernel space) 3607 * @sock: socket 3608 * @page: page 3609 * @offset: page offset 3610 * @size: total size in bytes 3611 * @flags: flags (MSG_DONTWAIT, ...) 3612 * 3613 * Returns the total amount sent in bytes or an error. 3614 */ 3615 3616 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3617 size_t size, int flags) 3618 { 3619 if (sock->ops->sendpage) { 3620 /* Warn in case the improper page to zero-copy send */ 3621 WARN_ONCE(!sendpage_ok(page), "improper page for zero-copy send"); 3622 return sock->ops->sendpage(sock, page, offset, size, flags); 3623 } 3624 return sock_no_sendpage(sock, page, offset, size, flags); 3625 } 3626 EXPORT_SYMBOL(kernel_sendpage); 3627 3628 /** 3629 * kernel_sendpage_locked - send a &page through the locked sock (kernel space) 3630 * @sk: sock 3631 * @page: page 3632 * @offset: page offset 3633 * @size: total size in bytes 3634 * @flags: flags (MSG_DONTWAIT, ...) 3635 * 3636 * Returns the total amount sent in bytes or an error. 3637 * Caller must hold @sk. 3638 */ 3639 3640 int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, 3641 size_t size, int flags) 3642 { 3643 struct socket *sock = sk->sk_socket; 3644 3645 if (sock->ops->sendpage_locked) 3646 return sock->ops->sendpage_locked(sk, page, offset, size, 3647 flags); 3648 3649 return sock_no_sendpage_locked(sk, page, offset, size, flags); 3650 } 3651 EXPORT_SYMBOL(kernel_sendpage_locked); 3652 3653 /** 3654 * kernel_sock_shutdown - shut down part of a full-duplex connection (kernel space) 3655 * @sock: socket 3656 * @how: connection part 3657 * 3658 * Returns 0 or an error. 3659 */ 3660 3661 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3662 { 3663 return sock->ops->shutdown(sock, how); 3664 } 3665 EXPORT_SYMBOL(kernel_sock_shutdown); 3666 3667 /** 3668 * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket 3669 * @sk: socket 3670 * 3671 * This routine returns the IP overhead imposed by a socket i.e. 3672 * the length of the underlying IP header, depending on whether 3673 * this is an IPv4 or IPv6 socket and the length from IP options turned 3674 * on at the socket. Assumes that the caller has a lock on the socket. 3675 */ 3676 3677 u32 kernel_sock_ip_overhead(struct sock *sk) 3678 { 3679 struct inet_sock *inet; 3680 struct ip_options_rcu *opt; 3681 u32 overhead = 0; 3682 #if IS_ENABLED(CONFIG_IPV6) 3683 struct ipv6_pinfo *np; 3684 struct ipv6_txoptions *optv6 = NULL; 3685 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3686 3687 if (!sk) 3688 return overhead; 3689 3690 switch (sk->sk_family) { 3691 case AF_INET: 3692 inet = inet_sk(sk); 3693 overhead += sizeof(struct iphdr); 3694 opt = rcu_dereference_protected(inet->inet_opt, 3695 sock_owned_by_user(sk)); 3696 if (opt) 3697 overhead += opt->opt.optlen; 3698 return overhead; 3699 #if IS_ENABLED(CONFIG_IPV6) 3700 case AF_INET6: 3701 np = inet6_sk(sk); 3702 overhead += sizeof(struct ipv6hdr); 3703 if (np) 3704 optv6 = rcu_dereference_protected(np->opt, 3705 sock_owned_by_user(sk)); 3706 if (optv6) 3707 overhead += (optv6->opt_flen + optv6->opt_nflen); 3708 return overhead; 3709 #endif /* IS_ENABLED(CONFIG_IPV6) */ 3710 default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ 3711 return overhead; 3712 } 3713 } 3714 EXPORT_SYMBOL(kernel_sock_ip_overhead); 3715