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