1 /* 2 * NET An implementation of the SOCKET network access protocol. 3 * 4 * Version: @(#)socket.c 1.1.93 18/02/95 5 * 6 * Authors: Orest Zborowski, <obz@Kodak.COM> 7 * Ross Biro 8 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 9 * 10 * Fixes: 11 * Anonymous : NOTSOCK/BADF cleanup. Error fix in 12 * shutdown() 13 * Alan Cox : verify_area() fixes 14 * Alan Cox : Removed DDI 15 * Jonathan Kamens : SOCK_DGRAM reconnect bug 16 * Alan Cox : Moved a load of checks to the very 17 * top level. 18 * Alan Cox : Move address structures to/from user 19 * mode above the protocol layers. 20 * Rob Janssen : Allow 0 length sends. 21 * Alan Cox : Asynchronous I/O support (cribbed from the 22 * tty drivers). 23 * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) 24 * Jeff Uphoff : Made max number of sockets command-line 25 * configurable. 26 * Matti Aarnio : Made the number of sockets dynamic, 27 * to be allocated when needed, and mr. 28 * Uphoff's max is used as max to be 29 * allowed to allocate. 30 * Linus : Argh. removed all the socket allocation 31 * altogether: it's in the inode now. 32 * Alan Cox : Made sock_alloc()/sock_release() public 33 * for NetROM and future kernel nfsd type 34 * stuff. 35 * Alan Cox : sendmsg/recvmsg basics. 36 * Tom Dyas : Export net symbols. 37 * Marcin Dalecki : Fixed problems with CONFIG_NET="n". 38 * Alan Cox : Added thread locking to sys_* calls 39 * for sockets. May have errors at the 40 * moment. 41 * Kevin Buhr : Fixed the dumb errors in the above. 42 * Andi Kleen : Some small cleanups, optimizations, 43 * and fixed a copy_from_user() bug. 44 * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) 45 * Tigran Aivazian : Made listen(2) backlog sanity checks 46 * protocol-independent 47 * 48 * 49 * This program is free software; you can redistribute it and/or 50 * modify it under the terms of the GNU General Public License 51 * as published by the Free Software Foundation; either version 52 * 2 of the License, or (at your option) any later version. 53 * 54 * 55 * This module is effectively the top level interface to the BSD socket 56 * paradigm. 57 * 58 * Based upon Swansea University Computer Society NET3.039 59 */ 60 61 #include <linux/mm.h> 62 #include <linux/socket.h> 63 #include <linux/file.h> 64 #include <linux/net.h> 65 #include <linux/interrupt.h> 66 #include <linux/thread_info.h> 67 #include <linux/rcupdate.h> 68 #include <linux/netdevice.h> 69 #include <linux/proc_fs.h> 70 #include <linux/seq_file.h> 71 #include <linux/mutex.h> 72 #include <linux/if_bridge.h> 73 #include <linux/if_frad.h> 74 #include <linux/if_vlan.h> 75 #include <linux/ptp_classify.h> 76 #include <linux/init.h> 77 #include <linux/poll.h> 78 #include <linux/cache.h> 79 #include <linux/module.h> 80 #include <linux/highmem.h> 81 #include <linux/mount.h> 82 #include <linux/security.h> 83 #include <linux/syscalls.h> 84 #include <linux/compat.h> 85 #include <linux/kmod.h> 86 #include <linux/audit.h> 87 #include <linux/wireless.h> 88 #include <linux/nsproxy.h> 89 #include <linux/magic.h> 90 #include <linux/slab.h> 91 #include <linux/xattr.h> 92 93 #include <linux/uaccess.h> 94 #include <asm/unistd.h> 95 96 #include <net/compat.h> 97 #include <net/wext.h> 98 #include <net/cls_cgroup.h> 99 100 #include <net/sock.h> 101 #include <linux/netfilter.h> 102 103 #include <linux/if_tun.h> 104 #include <linux/ipv6_route.h> 105 #include <linux/route.h> 106 #include <linux/sockios.h> 107 #include <linux/atalk.h> 108 #include <net/busy_poll.h> 109 #include <linux/errqueue.h> 110 111 #ifdef CONFIG_NET_RX_BUSY_POLL 112 unsigned int sysctl_net_busy_read __read_mostly; 113 unsigned int sysctl_net_busy_poll __read_mostly; 114 #endif 115 116 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); 117 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); 118 static int sock_mmap(struct file *file, struct vm_area_struct *vma); 119 120 static int sock_close(struct inode *inode, struct file *file); 121 static unsigned int sock_poll(struct file *file, 122 struct poll_table_struct *wait); 123 static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 124 #ifdef CONFIG_COMPAT 125 static long compat_sock_ioctl(struct file *file, 126 unsigned int cmd, unsigned long arg); 127 #endif 128 static int sock_fasync(int fd, struct file *filp, int on); 129 static ssize_t sock_sendpage(struct file *file, struct page *page, 130 int offset, size_t size, loff_t *ppos, int more); 131 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 132 struct pipe_inode_info *pipe, size_t len, 133 unsigned int flags); 134 135 /* 136 * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear 137 * in the operation structures but are done directly via the socketcall() multiplexor. 138 */ 139 140 static const struct file_operations socket_file_ops = { 141 .owner = THIS_MODULE, 142 .llseek = no_llseek, 143 .read_iter = sock_read_iter, 144 .write_iter = sock_write_iter, 145 .poll = sock_poll, 146 .unlocked_ioctl = sock_ioctl, 147 #ifdef CONFIG_COMPAT 148 .compat_ioctl = compat_sock_ioctl, 149 #endif 150 .mmap = sock_mmap, 151 .release = sock_close, 152 .fasync = sock_fasync, 153 .sendpage = sock_sendpage, 154 .splice_write = generic_splice_sendpage, 155 .splice_read = sock_splice_read, 156 }; 157 158 /* 159 * The protocol list. Each protocol is registered in here. 160 */ 161 162 static DEFINE_SPINLOCK(net_family_lock); 163 static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; 164 165 /* 166 * Statistics counters of the socket lists 167 */ 168 169 static DEFINE_PER_CPU(int, sockets_in_use); 170 171 /* 172 * Support routines. 173 * Move socket addresses back and forth across the kernel/user 174 * divide and look after the messy bits. 175 */ 176 177 /** 178 * move_addr_to_kernel - copy a socket address into kernel space 179 * @uaddr: Address in user space 180 * @kaddr: Address in kernel space 181 * @ulen: Length in user space 182 * 183 * The address is copied into kernel space. If the provided address is 184 * too long an error code of -EINVAL is returned. If the copy gives 185 * invalid addresses -EFAULT is returned. On a success 0 is returned. 186 */ 187 188 int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) 189 { 190 if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) 191 return -EINVAL; 192 if (ulen == 0) 193 return 0; 194 if (copy_from_user(kaddr, uaddr, ulen)) 195 return -EFAULT; 196 return audit_sockaddr(ulen, kaddr); 197 } 198 199 /** 200 * move_addr_to_user - copy an address to user space 201 * @kaddr: kernel space address 202 * @klen: length of address in kernel 203 * @uaddr: user space address 204 * @ulen: pointer to user length field 205 * 206 * The value pointed to by ulen on entry is the buffer length available. 207 * This is overwritten with the buffer space used. -EINVAL is returned 208 * if an overlong buffer is specified or a negative buffer size. -EFAULT 209 * is returned if either the buffer or the length field are not 210 * accessible. 211 * After copying the data up to the limit the user specifies, the true 212 * length of the data is written over the length limit the user 213 * specified. Zero is returned for a success. 214 */ 215 216 static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, 217 void __user *uaddr, int __user *ulen) 218 { 219 int err; 220 int len; 221 222 BUG_ON(klen > sizeof(struct sockaddr_storage)); 223 err = get_user(len, ulen); 224 if (err) 225 return err; 226 if (len > klen) 227 len = klen; 228 if (len < 0) 229 return -EINVAL; 230 if (len) { 231 if (audit_sockaddr(klen, kaddr)) 232 return -ENOMEM; 233 if (copy_to_user(uaddr, kaddr, len)) 234 return -EFAULT; 235 } 236 /* 237 * "fromlen shall refer to the value before truncation.." 238 * 1003.1g 239 */ 240 return __put_user(klen, ulen); 241 } 242 243 static struct kmem_cache *sock_inode_cachep __read_mostly; 244 245 static struct inode *sock_alloc_inode(struct super_block *sb) 246 { 247 struct socket_alloc *ei; 248 struct socket_wq *wq; 249 250 ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); 251 if (!ei) 252 return NULL; 253 wq = kmalloc(sizeof(*wq), GFP_KERNEL); 254 if (!wq) { 255 kmem_cache_free(sock_inode_cachep, ei); 256 return NULL; 257 } 258 init_waitqueue_head(&wq->wait); 259 wq->fasync_list = NULL; 260 wq->flags = 0; 261 RCU_INIT_POINTER(ei->socket.wq, wq); 262 263 ei->socket.state = SS_UNCONNECTED; 264 ei->socket.flags = 0; 265 ei->socket.ops = NULL; 266 ei->socket.sk = NULL; 267 ei->socket.file = NULL; 268 269 return &ei->vfs_inode; 270 } 271 272 static void sock_destroy_inode(struct inode *inode) 273 { 274 struct socket_alloc *ei; 275 struct socket_wq *wq; 276 277 ei = container_of(inode, struct socket_alloc, vfs_inode); 278 wq = rcu_dereference_protected(ei->socket.wq, 1); 279 kfree_rcu(wq, rcu); 280 kmem_cache_free(sock_inode_cachep, ei); 281 } 282 283 static void init_once(void *foo) 284 { 285 struct socket_alloc *ei = (struct socket_alloc *)foo; 286 287 inode_init_once(&ei->vfs_inode); 288 } 289 290 static void init_inodecache(void) 291 { 292 sock_inode_cachep = kmem_cache_create("sock_inode_cache", 293 sizeof(struct socket_alloc), 294 0, 295 (SLAB_HWCACHE_ALIGN | 296 SLAB_RECLAIM_ACCOUNT | 297 SLAB_MEM_SPREAD | SLAB_ACCOUNT), 298 init_once); 299 BUG_ON(sock_inode_cachep == NULL); 300 } 301 302 static const struct super_operations sockfs_ops = { 303 .alloc_inode = sock_alloc_inode, 304 .destroy_inode = sock_destroy_inode, 305 .statfs = simple_statfs, 306 }; 307 308 /* 309 * sockfs_dname() is called from d_path(). 310 */ 311 static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) 312 { 313 return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", 314 d_inode(dentry)->i_ino); 315 } 316 317 static const struct dentry_operations sockfs_dentry_operations = { 318 .d_dname = sockfs_dname, 319 }; 320 321 static int sockfs_xattr_get(const struct xattr_handler *handler, 322 struct dentry *dentry, struct inode *inode, 323 const char *suffix, void *value, size_t size) 324 { 325 if (value) { 326 if (dentry->d_name.len + 1 > size) 327 return -ERANGE; 328 memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); 329 } 330 return dentry->d_name.len + 1; 331 } 332 333 #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" 334 #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) 335 #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) 336 337 static const struct xattr_handler sockfs_xattr_handler = { 338 .name = XATTR_NAME_SOCKPROTONAME, 339 .get = sockfs_xattr_get, 340 }; 341 342 static int sockfs_security_xattr_set(const struct xattr_handler *handler, 343 struct dentry *dentry, struct inode *inode, 344 const char *suffix, const void *value, 345 size_t size, int flags) 346 { 347 /* Handled by LSM. */ 348 return -EAGAIN; 349 } 350 351 static const struct xattr_handler sockfs_security_xattr_handler = { 352 .prefix = XATTR_SECURITY_PREFIX, 353 .set = sockfs_security_xattr_set, 354 }; 355 356 static const struct xattr_handler *sockfs_xattr_handlers[] = { 357 &sockfs_xattr_handler, 358 &sockfs_security_xattr_handler, 359 NULL 360 }; 361 362 static struct dentry *sockfs_mount(struct file_system_type *fs_type, 363 int flags, const char *dev_name, void *data) 364 { 365 return mount_pseudo_xattr(fs_type, "socket:", &sockfs_ops, 366 sockfs_xattr_handlers, 367 &sockfs_dentry_operations, SOCKFS_MAGIC); 368 } 369 370 static struct vfsmount *sock_mnt __read_mostly; 371 372 static struct file_system_type sock_fs_type = { 373 .name = "sockfs", 374 .mount = sockfs_mount, 375 .kill_sb = kill_anon_super, 376 }; 377 378 /* 379 * Obtains the first available file descriptor and sets it up for use. 380 * 381 * These functions create file structures and maps them to fd space 382 * of the current process. On success it returns file descriptor 383 * and file struct implicitly stored in sock->file. 384 * Note that another thread may close file descriptor before we return 385 * from this function. We use the fact that now we do not refer 386 * to socket after mapping. If one day we will need it, this 387 * function will increment ref. count on file by 1. 388 * 389 * In any case returned fd MAY BE not valid! 390 * This race condition is unavoidable 391 * with shared fd spaces, we cannot solve it inside kernel, 392 * but we take care of internal coherence yet. 393 */ 394 395 struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) 396 { 397 struct qstr name = { .name = "" }; 398 struct path path; 399 struct file *file; 400 401 if (dname) { 402 name.name = dname; 403 name.len = strlen(name.name); 404 } else if (sock->sk) { 405 name.name = sock->sk->sk_prot_creator->name; 406 name.len = strlen(name.name); 407 } 408 path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name); 409 if (unlikely(!path.dentry)) 410 return ERR_PTR(-ENOMEM); 411 path.mnt = mntget(sock_mnt); 412 413 d_instantiate(path.dentry, SOCK_INODE(sock)); 414 415 file = alloc_file(&path, FMODE_READ | FMODE_WRITE, 416 &socket_file_ops); 417 if (IS_ERR(file)) { 418 /* drop dentry, keep inode */ 419 ihold(d_inode(path.dentry)); 420 path_put(&path); 421 return file; 422 } 423 424 sock->file = file; 425 file->f_flags = O_RDWR | (flags & O_NONBLOCK); 426 file->private_data = sock; 427 return file; 428 } 429 EXPORT_SYMBOL(sock_alloc_file); 430 431 static int sock_map_fd(struct socket *sock, int flags) 432 { 433 struct file *newfile; 434 int fd = get_unused_fd_flags(flags); 435 if (unlikely(fd < 0)) 436 return fd; 437 438 newfile = sock_alloc_file(sock, flags, NULL); 439 if (likely(!IS_ERR(newfile))) { 440 fd_install(fd, newfile); 441 return fd; 442 } 443 444 put_unused_fd(fd); 445 return PTR_ERR(newfile); 446 } 447 448 struct socket *sock_from_file(struct file *file, int *err) 449 { 450 if (file->f_op == &socket_file_ops) 451 return file->private_data; /* set in sock_map_fd */ 452 453 *err = -ENOTSOCK; 454 return NULL; 455 } 456 EXPORT_SYMBOL(sock_from_file); 457 458 /** 459 * sockfd_lookup - Go from a file number to its socket slot 460 * @fd: file handle 461 * @err: pointer to an error code return 462 * 463 * The file handle passed in is locked and the socket it is bound 464 * too is returned. If an error occurs the err pointer is overwritten 465 * with a negative errno code and NULL is returned. The function checks 466 * for both invalid handles and passing a handle which is not a socket. 467 * 468 * On a success the socket object pointer is returned. 469 */ 470 471 struct socket *sockfd_lookup(int fd, int *err) 472 { 473 struct file *file; 474 struct socket *sock; 475 476 file = fget(fd); 477 if (!file) { 478 *err = -EBADF; 479 return NULL; 480 } 481 482 sock = sock_from_file(file, err); 483 if (!sock) 484 fput(file); 485 return sock; 486 } 487 EXPORT_SYMBOL(sockfd_lookup); 488 489 static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) 490 { 491 struct fd f = fdget(fd); 492 struct socket *sock; 493 494 *err = -EBADF; 495 if (f.file) { 496 sock = sock_from_file(f.file, err); 497 if (likely(sock)) { 498 *fput_needed = f.flags; 499 return sock; 500 } 501 fdput(f); 502 } 503 return NULL; 504 } 505 506 static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, 507 size_t size) 508 { 509 ssize_t len; 510 ssize_t used = 0; 511 512 len = security_inode_listsecurity(d_inode(dentry), buffer, size); 513 if (len < 0) 514 return len; 515 used += len; 516 if (buffer) { 517 if (size < used) 518 return -ERANGE; 519 buffer += len; 520 } 521 522 len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); 523 used += len; 524 if (buffer) { 525 if (size < used) 526 return -ERANGE; 527 memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); 528 buffer += len; 529 } 530 531 return used; 532 } 533 534 static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) 535 { 536 int err = simple_setattr(dentry, iattr); 537 538 if (!err && (iattr->ia_valid & ATTR_UID)) { 539 struct socket *sock = SOCKET_I(d_inode(dentry)); 540 541 sock->sk->sk_uid = iattr->ia_uid; 542 } 543 544 return err; 545 } 546 547 static const struct inode_operations sockfs_inode_ops = { 548 .listxattr = sockfs_listxattr, 549 .setattr = sockfs_setattr, 550 }; 551 552 /** 553 * sock_alloc - allocate a socket 554 * 555 * Allocate a new inode and socket object. The two are bound together 556 * and initialised. The socket is then returned. If we are out of inodes 557 * NULL is returned. 558 */ 559 560 struct socket *sock_alloc(void) 561 { 562 struct inode *inode; 563 struct socket *sock; 564 565 inode = new_inode_pseudo(sock_mnt->mnt_sb); 566 if (!inode) 567 return NULL; 568 569 sock = SOCKET_I(inode); 570 571 kmemcheck_annotate_bitfield(sock, type); 572 inode->i_ino = get_next_ino(); 573 inode->i_mode = S_IFSOCK | S_IRWXUGO; 574 inode->i_uid = current_fsuid(); 575 inode->i_gid = current_fsgid(); 576 inode->i_op = &sockfs_inode_ops; 577 578 this_cpu_add(sockets_in_use, 1); 579 return sock; 580 } 581 EXPORT_SYMBOL(sock_alloc); 582 583 /** 584 * sock_release - close a socket 585 * @sock: socket to close 586 * 587 * The socket is released from the protocol stack if it has a release 588 * callback, and the inode is then released if the socket is bound to 589 * an inode not a file. 590 */ 591 592 void sock_release(struct socket *sock) 593 { 594 if (sock->ops) { 595 struct module *owner = sock->ops->owner; 596 597 sock->ops->release(sock); 598 sock->ops = NULL; 599 module_put(owner); 600 } 601 602 if (rcu_dereference_protected(sock->wq, 1)->fasync_list) 603 pr_err("%s: fasync list not empty!\n", __func__); 604 605 this_cpu_sub(sockets_in_use, 1); 606 if (!sock->file) { 607 iput(SOCK_INODE(sock)); 608 return; 609 } 610 sock->file = NULL; 611 } 612 EXPORT_SYMBOL(sock_release); 613 614 void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags) 615 { 616 u8 flags = *tx_flags; 617 618 if (tsflags & SOF_TIMESTAMPING_TX_HARDWARE) 619 flags |= SKBTX_HW_TSTAMP; 620 621 if (tsflags & SOF_TIMESTAMPING_TX_SOFTWARE) 622 flags |= SKBTX_SW_TSTAMP; 623 624 if (tsflags & SOF_TIMESTAMPING_TX_SCHED) 625 flags |= SKBTX_SCHED_TSTAMP; 626 627 *tx_flags = flags; 628 } 629 EXPORT_SYMBOL(__sock_tx_timestamp); 630 631 static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) 632 { 633 int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg)); 634 BUG_ON(ret == -EIOCBQUEUED); 635 return ret; 636 } 637 638 int sock_sendmsg(struct socket *sock, struct msghdr *msg) 639 { 640 int err = security_socket_sendmsg(sock, msg, 641 msg_data_left(msg)); 642 643 return err ?: sock_sendmsg_nosec(sock, msg); 644 } 645 EXPORT_SYMBOL(sock_sendmsg); 646 647 int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 648 struct kvec *vec, size_t num, size_t size) 649 { 650 iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size); 651 return sock_sendmsg(sock, msg); 652 } 653 EXPORT_SYMBOL(kernel_sendmsg); 654 655 /* 656 * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) 657 */ 658 void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 659 struct sk_buff *skb) 660 { 661 int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); 662 struct scm_timestamping tss; 663 int empty = 1; 664 struct skb_shared_hwtstamps *shhwtstamps = 665 skb_hwtstamps(skb); 666 667 /* Race occurred between timestamp enabling and packet 668 receiving. Fill in the current time for now. */ 669 if (need_software_tstamp && skb->tstamp == 0) 670 __net_timestamp(skb); 671 672 if (need_software_tstamp) { 673 if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { 674 struct timeval tv; 675 skb_get_timestamp(skb, &tv); 676 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP, 677 sizeof(tv), &tv); 678 } else { 679 struct timespec ts; 680 skb_get_timestampns(skb, &ts); 681 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS, 682 sizeof(ts), &ts); 683 } 684 } 685 686 memset(&tss, 0, sizeof(tss)); 687 if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && 688 ktime_to_timespec_cond(skb->tstamp, tss.ts + 0)) 689 empty = 0; 690 if (shhwtstamps && 691 (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && 692 ktime_to_timespec_cond(shhwtstamps->hwtstamp, tss.ts + 2)) 693 empty = 0; 694 if (!empty) { 695 put_cmsg(msg, SOL_SOCKET, 696 SCM_TIMESTAMPING, sizeof(tss), &tss); 697 698 if (skb->len && (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS)) 699 put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, 700 skb->len, skb->data); 701 } 702 } 703 EXPORT_SYMBOL_GPL(__sock_recv_timestamp); 704 705 void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, 706 struct sk_buff *skb) 707 { 708 int ack; 709 710 if (!sock_flag(sk, SOCK_WIFI_STATUS)) 711 return; 712 if (!skb->wifi_acked_valid) 713 return; 714 715 ack = skb->wifi_acked; 716 717 put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); 718 } 719 EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); 720 721 static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, 722 struct sk_buff *skb) 723 { 724 if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) 725 put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, 726 sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); 727 } 728 729 void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, 730 struct sk_buff *skb) 731 { 732 sock_recv_timestamp(msg, sk, skb); 733 sock_recv_drops(msg, sk, skb); 734 } 735 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); 736 737 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, 738 int flags) 739 { 740 return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags); 741 } 742 743 int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) 744 { 745 int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); 746 747 return err ?: sock_recvmsg_nosec(sock, msg, flags); 748 } 749 EXPORT_SYMBOL(sock_recvmsg); 750 751 /** 752 * kernel_recvmsg - Receive a message from a socket (kernel space) 753 * @sock: The socket to receive the message from 754 * @msg: Received message 755 * @vec: Input s/g array for message data 756 * @num: Size of input s/g array 757 * @size: Number of bytes to read 758 * @flags: Message flags (MSG_DONTWAIT, etc...) 759 * 760 * On return the msg structure contains the scatter/gather array passed in the 761 * vec argument. The array is modified so that it consists of the unfilled 762 * portion of the original array. 763 * 764 * The returned value is the total number of bytes received, or an error. 765 */ 766 int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 767 struct kvec *vec, size_t num, size_t size, int flags) 768 { 769 mm_segment_t oldfs = get_fs(); 770 int result; 771 772 iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size); 773 set_fs(KERNEL_DS); 774 result = sock_recvmsg(sock, msg, flags); 775 set_fs(oldfs); 776 return result; 777 } 778 EXPORT_SYMBOL(kernel_recvmsg); 779 780 static ssize_t sock_sendpage(struct file *file, struct page *page, 781 int offset, size_t size, loff_t *ppos, int more) 782 { 783 struct socket *sock; 784 int flags; 785 786 sock = file->private_data; 787 788 flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; 789 /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ 790 flags |= more; 791 792 return kernel_sendpage(sock, page, offset, size, flags); 793 } 794 795 static ssize_t sock_splice_read(struct file *file, loff_t *ppos, 796 struct pipe_inode_info *pipe, size_t len, 797 unsigned int flags) 798 { 799 struct socket *sock = file->private_data; 800 801 if (unlikely(!sock->ops->splice_read)) 802 return -EINVAL; 803 804 return sock->ops->splice_read(sock, ppos, pipe, len, flags); 805 } 806 807 static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) 808 { 809 struct file *file = iocb->ki_filp; 810 struct socket *sock = file->private_data; 811 struct msghdr msg = {.msg_iter = *to, 812 .msg_iocb = iocb}; 813 ssize_t res; 814 815 if (file->f_flags & O_NONBLOCK) 816 msg.msg_flags = MSG_DONTWAIT; 817 818 if (iocb->ki_pos != 0) 819 return -ESPIPE; 820 821 if (!iov_iter_count(to)) /* Match SYS5 behaviour */ 822 return 0; 823 824 res = sock_recvmsg(sock, &msg, msg.msg_flags); 825 *to = msg.msg_iter; 826 return res; 827 } 828 829 static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) 830 { 831 struct file *file = iocb->ki_filp; 832 struct socket *sock = file->private_data; 833 struct msghdr msg = {.msg_iter = *from, 834 .msg_iocb = iocb}; 835 ssize_t res; 836 837 if (iocb->ki_pos != 0) 838 return -ESPIPE; 839 840 if (file->f_flags & O_NONBLOCK) 841 msg.msg_flags = MSG_DONTWAIT; 842 843 if (sock->type == SOCK_SEQPACKET) 844 msg.msg_flags |= MSG_EOR; 845 846 res = sock_sendmsg(sock, &msg); 847 *from = msg.msg_iter; 848 return res; 849 } 850 851 /* 852 * Atomic setting of ioctl hooks to avoid race 853 * with module unload. 854 */ 855 856 static DEFINE_MUTEX(br_ioctl_mutex); 857 static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); 858 859 void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) 860 { 861 mutex_lock(&br_ioctl_mutex); 862 br_ioctl_hook = hook; 863 mutex_unlock(&br_ioctl_mutex); 864 } 865 EXPORT_SYMBOL(brioctl_set); 866 867 static DEFINE_MUTEX(vlan_ioctl_mutex); 868 static int (*vlan_ioctl_hook) (struct net *, void __user *arg); 869 870 void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) 871 { 872 mutex_lock(&vlan_ioctl_mutex); 873 vlan_ioctl_hook = hook; 874 mutex_unlock(&vlan_ioctl_mutex); 875 } 876 EXPORT_SYMBOL(vlan_ioctl_set); 877 878 static DEFINE_MUTEX(dlci_ioctl_mutex); 879 static int (*dlci_ioctl_hook) (unsigned int, void __user *); 880 881 void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) 882 { 883 mutex_lock(&dlci_ioctl_mutex); 884 dlci_ioctl_hook = hook; 885 mutex_unlock(&dlci_ioctl_mutex); 886 } 887 EXPORT_SYMBOL(dlci_ioctl_set); 888 889 static long sock_do_ioctl(struct net *net, struct socket *sock, 890 unsigned int cmd, unsigned long arg) 891 { 892 int err; 893 void __user *argp = (void __user *)arg; 894 895 err = sock->ops->ioctl(sock, cmd, arg); 896 897 /* 898 * If this ioctl is unknown try to hand it down 899 * to the NIC driver. 900 */ 901 if (err == -ENOIOCTLCMD) 902 err = dev_ioctl(net, cmd, argp); 903 904 return err; 905 } 906 907 /* 908 * With an ioctl, arg may well be a user mode pointer, but we don't know 909 * what to do with it - that's up to the protocol still. 910 */ 911 912 static struct ns_common *get_net_ns(struct ns_common *ns) 913 { 914 return &get_net(container_of(ns, struct net, ns))->ns; 915 } 916 917 static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) 918 { 919 struct socket *sock; 920 struct sock *sk; 921 void __user *argp = (void __user *)arg; 922 int pid, err; 923 struct net *net; 924 925 sock = file->private_data; 926 sk = sock->sk; 927 net = sock_net(sk); 928 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) { 929 err = dev_ioctl(net, cmd, argp); 930 } else 931 #ifdef CONFIG_WEXT_CORE 932 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { 933 err = dev_ioctl(net, cmd, argp); 934 } else 935 #endif 936 switch (cmd) { 937 case FIOSETOWN: 938 case SIOCSPGRP: 939 err = -EFAULT; 940 if (get_user(pid, (int __user *)argp)) 941 break; 942 f_setown(sock->file, pid, 1); 943 err = 0; 944 break; 945 case FIOGETOWN: 946 case SIOCGPGRP: 947 err = put_user(f_getown(sock->file), 948 (int __user *)argp); 949 break; 950 case SIOCGIFBR: 951 case SIOCSIFBR: 952 case SIOCBRADDBR: 953 case SIOCBRDELBR: 954 err = -ENOPKG; 955 if (!br_ioctl_hook) 956 request_module("bridge"); 957 958 mutex_lock(&br_ioctl_mutex); 959 if (br_ioctl_hook) 960 err = br_ioctl_hook(net, cmd, argp); 961 mutex_unlock(&br_ioctl_mutex); 962 break; 963 case SIOCGIFVLAN: 964 case SIOCSIFVLAN: 965 err = -ENOPKG; 966 if (!vlan_ioctl_hook) 967 request_module("8021q"); 968 969 mutex_lock(&vlan_ioctl_mutex); 970 if (vlan_ioctl_hook) 971 err = vlan_ioctl_hook(net, argp); 972 mutex_unlock(&vlan_ioctl_mutex); 973 break; 974 case SIOCADDDLCI: 975 case SIOCDELDLCI: 976 err = -ENOPKG; 977 if (!dlci_ioctl_hook) 978 request_module("dlci"); 979 980 mutex_lock(&dlci_ioctl_mutex); 981 if (dlci_ioctl_hook) 982 err = dlci_ioctl_hook(cmd, argp); 983 mutex_unlock(&dlci_ioctl_mutex); 984 break; 985 case SIOCGSKNS: 986 err = -EPERM; 987 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 988 break; 989 990 err = open_related_ns(&net->ns, get_net_ns); 991 break; 992 default: 993 err = sock_do_ioctl(net, sock, cmd, arg); 994 break; 995 } 996 return err; 997 } 998 999 int sock_create_lite(int family, int type, int protocol, struct socket **res) 1000 { 1001 int err; 1002 struct socket *sock = NULL; 1003 1004 err = security_socket_create(family, type, protocol, 1); 1005 if (err) 1006 goto out; 1007 1008 sock = sock_alloc(); 1009 if (!sock) { 1010 err = -ENOMEM; 1011 goto out; 1012 } 1013 1014 sock->type = type; 1015 err = security_socket_post_create(sock, family, type, protocol, 1); 1016 if (err) 1017 goto out_release; 1018 1019 out: 1020 *res = sock; 1021 return err; 1022 out_release: 1023 sock_release(sock); 1024 sock = NULL; 1025 goto out; 1026 } 1027 EXPORT_SYMBOL(sock_create_lite); 1028 1029 /* No kernel lock held - perfect */ 1030 static unsigned int sock_poll(struct file *file, poll_table *wait) 1031 { 1032 unsigned int busy_flag = 0; 1033 struct socket *sock; 1034 1035 /* 1036 * We can't return errors to poll, so it's either yes or no. 1037 */ 1038 sock = file->private_data; 1039 1040 if (sk_can_busy_loop(sock->sk)) { 1041 /* this socket can poll_ll so tell the system call */ 1042 busy_flag = POLL_BUSY_LOOP; 1043 1044 /* once, only if requested by syscall */ 1045 if (wait && (wait->_key & POLL_BUSY_LOOP)) 1046 sk_busy_loop(sock->sk, 1); 1047 } 1048 1049 return busy_flag | sock->ops->poll(file, sock, wait); 1050 } 1051 1052 static int sock_mmap(struct file *file, struct vm_area_struct *vma) 1053 { 1054 struct socket *sock = file->private_data; 1055 1056 return sock->ops->mmap(file, sock, vma); 1057 } 1058 1059 static int sock_close(struct inode *inode, struct file *filp) 1060 { 1061 sock_release(SOCKET_I(inode)); 1062 return 0; 1063 } 1064 1065 /* 1066 * Update the socket async list 1067 * 1068 * Fasync_list locking strategy. 1069 * 1070 * 1. fasync_list is modified only under process context socket lock 1071 * i.e. under semaphore. 1072 * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) 1073 * or under socket lock 1074 */ 1075 1076 static int sock_fasync(int fd, struct file *filp, int on) 1077 { 1078 struct socket *sock = filp->private_data; 1079 struct sock *sk = sock->sk; 1080 struct socket_wq *wq; 1081 1082 if (sk == NULL) 1083 return -EINVAL; 1084 1085 lock_sock(sk); 1086 wq = rcu_dereference_protected(sock->wq, lockdep_sock_is_held(sk)); 1087 fasync_helper(fd, filp, on, &wq->fasync_list); 1088 1089 if (!wq->fasync_list) 1090 sock_reset_flag(sk, SOCK_FASYNC); 1091 else 1092 sock_set_flag(sk, SOCK_FASYNC); 1093 1094 release_sock(sk); 1095 return 0; 1096 } 1097 1098 /* This function may be called only under rcu_lock */ 1099 1100 int sock_wake_async(struct socket_wq *wq, int how, int band) 1101 { 1102 if (!wq || !wq->fasync_list) 1103 return -1; 1104 1105 switch (how) { 1106 case SOCK_WAKE_WAITD: 1107 if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) 1108 break; 1109 goto call_kill; 1110 case SOCK_WAKE_SPACE: 1111 if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) 1112 break; 1113 /* fall through */ 1114 case SOCK_WAKE_IO: 1115 call_kill: 1116 kill_fasync(&wq->fasync_list, SIGIO, band); 1117 break; 1118 case SOCK_WAKE_URG: 1119 kill_fasync(&wq->fasync_list, SIGURG, band); 1120 } 1121 1122 return 0; 1123 } 1124 EXPORT_SYMBOL(sock_wake_async); 1125 1126 int __sock_create(struct net *net, int family, int type, int protocol, 1127 struct socket **res, int kern) 1128 { 1129 int err; 1130 struct socket *sock; 1131 const struct net_proto_family *pf; 1132 1133 /* 1134 * Check protocol is in range 1135 */ 1136 if (family < 0 || family >= NPROTO) 1137 return -EAFNOSUPPORT; 1138 if (type < 0 || type >= SOCK_MAX) 1139 return -EINVAL; 1140 1141 /* Compatibility. 1142 1143 This uglymoron is moved from INET layer to here to avoid 1144 deadlock in module load. 1145 */ 1146 if (family == PF_INET && type == SOCK_PACKET) { 1147 pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", 1148 current->comm); 1149 family = PF_PACKET; 1150 } 1151 1152 err = security_socket_create(family, type, protocol, kern); 1153 if (err) 1154 return err; 1155 1156 /* 1157 * Allocate the socket and allow the family to set things up. if 1158 * the protocol is 0, the family is instructed to select an appropriate 1159 * default. 1160 */ 1161 sock = sock_alloc(); 1162 if (!sock) { 1163 net_warn_ratelimited("socket: no more sockets\n"); 1164 return -ENFILE; /* Not exactly a match, but its the 1165 closest posix thing */ 1166 } 1167 1168 sock->type = type; 1169 1170 #ifdef CONFIG_MODULES 1171 /* Attempt to load a protocol module if the find failed. 1172 * 1173 * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user 1174 * requested real, full-featured networking support upon configuration. 1175 * Otherwise module support will break! 1176 */ 1177 if (rcu_access_pointer(net_families[family]) == NULL) 1178 request_module("net-pf-%d", family); 1179 #endif 1180 1181 rcu_read_lock(); 1182 pf = rcu_dereference(net_families[family]); 1183 err = -EAFNOSUPPORT; 1184 if (!pf) 1185 goto out_release; 1186 1187 /* 1188 * We will call the ->create function, that possibly is in a loadable 1189 * module, so we have to bump that loadable module refcnt first. 1190 */ 1191 if (!try_module_get(pf->owner)) 1192 goto out_release; 1193 1194 /* Now protected by module ref count */ 1195 rcu_read_unlock(); 1196 1197 err = pf->create(net, sock, protocol, kern); 1198 if (err < 0) 1199 goto out_module_put; 1200 1201 /* 1202 * Now to bump the refcnt of the [loadable] module that owns this 1203 * socket at sock_release time we decrement its refcnt. 1204 */ 1205 if (!try_module_get(sock->ops->owner)) 1206 goto out_module_busy; 1207 1208 /* 1209 * Now that we're done with the ->create function, the [loadable] 1210 * module can have its refcnt decremented 1211 */ 1212 module_put(pf->owner); 1213 err = security_socket_post_create(sock, family, type, protocol, kern); 1214 if (err) 1215 goto out_sock_release; 1216 *res = sock; 1217 1218 return 0; 1219 1220 out_module_busy: 1221 err = -EAFNOSUPPORT; 1222 out_module_put: 1223 sock->ops = NULL; 1224 module_put(pf->owner); 1225 out_sock_release: 1226 sock_release(sock); 1227 return err; 1228 1229 out_release: 1230 rcu_read_unlock(); 1231 goto out_sock_release; 1232 } 1233 EXPORT_SYMBOL(__sock_create); 1234 1235 int sock_create(int family, int type, int protocol, struct socket **res) 1236 { 1237 return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); 1238 } 1239 EXPORT_SYMBOL(sock_create); 1240 1241 int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) 1242 { 1243 return __sock_create(net, family, type, protocol, res, 1); 1244 } 1245 EXPORT_SYMBOL(sock_create_kern); 1246 1247 SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) 1248 { 1249 int retval; 1250 struct socket *sock; 1251 int flags; 1252 1253 /* Check the SOCK_* constants for consistency. */ 1254 BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); 1255 BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); 1256 BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); 1257 BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); 1258 1259 flags = type & ~SOCK_TYPE_MASK; 1260 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1261 return -EINVAL; 1262 type &= SOCK_TYPE_MASK; 1263 1264 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1265 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1266 1267 retval = sock_create(family, type, protocol, &sock); 1268 if (retval < 0) 1269 goto out; 1270 1271 retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); 1272 if (retval < 0) 1273 goto out_release; 1274 1275 out: 1276 /* It may be already another descriptor 8) Not kernel problem. */ 1277 return retval; 1278 1279 out_release: 1280 sock_release(sock); 1281 return retval; 1282 } 1283 1284 /* 1285 * Create a pair of connected sockets. 1286 */ 1287 1288 SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, 1289 int __user *, usockvec) 1290 { 1291 struct socket *sock1, *sock2; 1292 int fd1, fd2, err; 1293 struct file *newfile1, *newfile2; 1294 int flags; 1295 1296 flags = type & ~SOCK_TYPE_MASK; 1297 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1298 return -EINVAL; 1299 type &= SOCK_TYPE_MASK; 1300 1301 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1302 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1303 1304 /* 1305 * Obtain the first socket and check if the underlying protocol 1306 * supports the socketpair call. 1307 */ 1308 1309 err = sock_create(family, type, protocol, &sock1); 1310 if (err < 0) 1311 goto out; 1312 1313 err = sock_create(family, type, protocol, &sock2); 1314 if (err < 0) 1315 goto out_release_1; 1316 1317 err = sock1->ops->socketpair(sock1, sock2); 1318 if (err < 0) 1319 goto out_release_both; 1320 1321 fd1 = get_unused_fd_flags(flags); 1322 if (unlikely(fd1 < 0)) { 1323 err = fd1; 1324 goto out_release_both; 1325 } 1326 1327 fd2 = get_unused_fd_flags(flags); 1328 if (unlikely(fd2 < 0)) { 1329 err = fd2; 1330 goto out_put_unused_1; 1331 } 1332 1333 newfile1 = sock_alloc_file(sock1, flags, NULL); 1334 if (IS_ERR(newfile1)) { 1335 err = PTR_ERR(newfile1); 1336 goto out_put_unused_both; 1337 } 1338 1339 newfile2 = sock_alloc_file(sock2, flags, NULL); 1340 if (IS_ERR(newfile2)) { 1341 err = PTR_ERR(newfile2); 1342 goto out_fput_1; 1343 } 1344 1345 err = put_user(fd1, &usockvec[0]); 1346 if (err) 1347 goto out_fput_both; 1348 1349 err = put_user(fd2, &usockvec[1]); 1350 if (err) 1351 goto out_fput_both; 1352 1353 audit_fd_pair(fd1, fd2); 1354 1355 fd_install(fd1, newfile1); 1356 fd_install(fd2, newfile2); 1357 /* fd1 and fd2 may be already another descriptors. 1358 * Not kernel problem. 1359 */ 1360 1361 return 0; 1362 1363 out_fput_both: 1364 fput(newfile2); 1365 fput(newfile1); 1366 put_unused_fd(fd2); 1367 put_unused_fd(fd1); 1368 goto out; 1369 1370 out_fput_1: 1371 fput(newfile1); 1372 put_unused_fd(fd2); 1373 put_unused_fd(fd1); 1374 sock_release(sock2); 1375 goto out; 1376 1377 out_put_unused_both: 1378 put_unused_fd(fd2); 1379 out_put_unused_1: 1380 put_unused_fd(fd1); 1381 out_release_both: 1382 sock_release(sock2); 1383 out_release_1: 1384 sock_release(sock1); 1385 out: 1386 return err; 1387 } 1388 1389 /* 1390 * Bind a name to a socket. Nothing much to do here since it's 1391 * the protocol's responsibility to handle the local address. 1392 * 1393 * We move the socket address to kernel space before we call 1394 * the protocol layer (having also checked the address is ok). 1395 */ 1396 1397 SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) 1398 { 1399 struct socket *sock; 1400 struct sockaddr_storage address; 1401 int err, fput_needed; 1402 1403 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1404 if (sock) { 1405 err = move_addr_to_kernel(umyaddr, addrlen, &address); 1406 if (err >= 0) { 1407 err = security_socket_bind(sock, 1408 (struct sockaddr *)&address, 1409 addrlen); 1410 if (!err) 1411 err = sock->ops->bind(sock, 1412 (struct sockaddr *) 1413 &address, addrlen); 1414 } 1415 fput_light(sock->file, fput_needed); 1416 } 1417 return err; 1418 } 1419 1420 /* 1421 * Perform a listen. Basically, we allow the protocol to do anything 1422 * necessary for a listen, and if that works, we mark the socket as 1423 * ready for listening. 1424 */ 1425 1426 SYSCALL_DEFINE2(listen, int, fd, int, backlog) 1427 { 1428 struct socket *sock; 1429 int err, fput_needed; 1430 int somaxconn; 1431 1432 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1433 if (sock) { 1434 somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; 1435 if ((unsigned int)backlog > somaxconn) 1436 backlog = somaxconn; 1437 1438 err = security_socket_listen(sock, backlog); 1439 if (!err) 1440 err = sock->ops->listen(sock, backlog); 1441 1442 fput_light(sock->file, fput_needed); 1443 } 1444 return err; 1445 } 1446 1447 /* 1448 * For accept, we attempt to create a new socket, set up the link 1449 * with the client, wake up the client, then return the new 1450 * connected fd. We collect the address of the connector in kernel 1451 * space and move it to user at the very end. This is unclean because 1452 * we open the socket then return an error. 1453 * 1454 * 1003.1g adds the ability to recvmsg() to query connection pending 1455 * status to recvmsg. We need to add that support in a way thats 1456 * clean when we restucture accept also. 1457 */ 1458 1459 SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, 1460 int __user *, upeer_addrlen, int, flags) 1461 { 1462 struct socket *sock, *newsock; 1463 struct file *newfile; 1464 int err, len, newfd, fput_needed; 1465 struct sockaddr_storage address; 1466 1467 if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1468 return -EINVAL; 1469 1470 if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) 1471 flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1472 1473 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1474 if (!sock) 1475 goto out; 1476 1477 err = -ENFILE; 1478 newsock = sock_alloc(); 1479 if (!newsock) 1480 goto out_put; 1481 1482 newsock->type = sock->type; 1483 newsock->ops = sock->ops; 1484 1485 /* 1486 * We don't need try_module_get here, as the listening socket (sock) 1487 * has the protocol module (sock->ops->owner) held. 1488 */ 1489 __module_get(newsock->ops->owner); 1490 1491 newfd = get_unused_fd_flags(flags); 1492 if (unlikely(newfd < 0)) { 1493 err = newfd; 1494 sock_release(newsock); 1495 goto out_put; 1496 } 1497 newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); 1498 if (IS_ERR(newfile)) { 1499 err = PTR_ERR(newfile); 1500 put_unused_fd(newfd); 1501 sock_release(newsock); 1502 goto out_put; 1503 } 1504 1505 err = security_socket_accept(sock, newsock); 1506 if (err) 1507 goto out_fd; 1508 1509 err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); 1510 if (err < 0) 1511 goto out_fd; 1512 1513 if (upeer_sockaddr) { 1514 if (newsock->ops->getname(newsock, (struct sockaddr *)&address, 1515 &len, 2) < 0) { 1516 err = -ECONNABORTED; 1517 goto out_fd; 1518 } 1519 err = move_addr_to_user(&address, 1520 len, upeer_sockaddr, upeer_addrlen); 1521 if (err < 0) 1522 goto out_fd; 1523 } 1524 1525 /* File flags are not inherited via accept() unlike another OSes. */ 1526 1527 fd_install(newfd, newfile); 1528 err = newfd; 1529 1530 out_put: 1531 fput_light(sock->file, fput_needed); 1532 out: 1533 return err; 1534 out_fd: 1535 fput(newfile); 1536 put_unused_fd(newfd); 1537 goto out_put; 1538 } 1539 1540 SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, 1541 int __user *, upeer_addrlen) 1542 { 1543 return sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); 1544 } 1545 1546 /* 1547 * Attempt to connect to a socket with the server address. The address 1548 * is in user space so we verify it is OK and move it to kernel space. 1549 * 1550 * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to 1551 * break bindings 1552 * 1553 * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and 1554 * other SEQPACKET protocols that take time to connect() as it doesn't 1555 * include the -EINPROGRESS status for such sockets. 1556 */ 1557 1558 SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, 1559 int, addrlen) 1560 { 1561 struct socket *sock; 1562 struct sockaddr_storage address; 1563 int err, fput_needed; 1564 1565 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1566 if (!sock) 1567 goto out; 1568 err = move_addr_to_kernel(uservaddr, addrlen, &address); 1569 if (err < 0) 1570 goto out_put; 1571 1572 err = 1573 security_socket_connect(sock, (struct sockaddr *)&address, addrlen); 1574 if (err) 1575 goto out_put; 1576 1577 err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, 1578 sock->file->f_flags); 1579 out_put: 1580 fput_light(sock->file, fput_needed); 1581 out: 1582 return err; 1583 } 1584 1585 /* 1586 * Get the local address ('name') of a socket object. Move the obtained 1587 * name to user space. 1588 */ 1589 1590 SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, 1591 int __user *, usockaddr_len) 1592 { 1593 struct socket *sock; 1594 struct sockaddr_storage address; 1595 int len, err, fput_needed; 1596 1597 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1598 if (!sock) 1599 goto out; 1600 1601 err = security_socket_getsockname(sock); 1602 if (err) 1603 goto out_put; 1604 1605 err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0); 1606 if (err) 1607 goto out_put; 1608 err = move_addr_to_user(&address, len, usockaddr, usockaddr_len); 1609 1610 out_put: 1611 fput_light(sock->file, fput_needed); 1612 out: 1613 return err; 1614 } 1615 1616 /* 1617 * Get the remote address ('name') of a socket object. Move the obtained 1618 * name to user space. 1619 */ 1620 1621 SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, 1622 int __user *, usockaddr_len) 1623 { 1624 struct socket *sock; 1625 struct sockaddr_storage address; 1626 int len, err, fput_needed; 1627 1628 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1629 if (sock != NULL) { 1630 err = security_socket_getpeername(sock); 1631 if (err) { 1632 fput_light(sock->file, fput_needed); 1633 return err; 1634 } 1635 1636 err = 1637 sock->ops->getname(sock, (struct sockaddr *)&address, &len, 1638 1); 1639 if (!err) 1640 err = move_addr_to_user(&address, len, usockaddr, 1641 usockaddr_len); 1642 fput_light(sock->file, fput_needed); 1643 } 1644 return err; 1645 } 1646 1647 /* 1648 * Send a datagram to a given address. We move the address into kernel 1649 * space and check the user space data area is readable before invoking 1650 * the protocol. 1651 */ 1652 1653 SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, 1654 unsigned int, flags, struct sockaddr __user *, addr, 1655 int, addr_len) 1656 { 1657 struct socket *sock; 1658 struct sockaddr_storage address; 1659 int err; 1660 struct msghdr msg; 1661 struct iovec iov; 1662 int fput_needed; 1663 1664 err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); 1665 if (unlikely(err)) 1666 return err; 1667 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1668 if (!sock) 1669 goto out; 1670 1671 msg.msg_name = NULL; 1672 msg.msg_control = NULL; 1673 msg.msg_controllen = 0; 1674 msg.msg_namelen = 0; 1675 if (addr) { 1676 err = move_addr_to_kernel(addr, addr_len, &address); 1677 if (err < 0) 1678 goto out_put; 1679 msg.msg_name = (struct sockaddr *)&address; 1680 msg.msg_namelen = addr_len; 1681 } 1682 if (sock->file->f_flags & O_NONBLOCK) 1683 flags |= MSG_DONTWAIT; 1684 msg.msg_flags = flags; 1685 err = sock_sendmsg(sock, &msg); 1686 1687 out_put: 1688 fput_light(sock->file, fput_needed); 1689 out: 1690 return err; 1691 } 1692 1693 /* 1694 * Send a datagram down a socket. 1695 */ 1696 1697 SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, 1698 unsigned int, flags) 1699 { 1700 return sys_sendto(fd, buff, len, flags, NULL, 0); 1701 } 1702 1703 /* 1704 * Receive a frame from the socket and optionally record the address of the 1705 * sender. We verify the buffers are writable and if needed move the 1706 * sender address from kernel to user space. 1707 */ 1708 1709 SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, 1710 unsigned int, flags, struct sockaddr __user *, addr, 1711 int __user *, addr_len) 1712 { 1713 struct socket *sock; 1714 struct iovec iov; 1715 struct msghdr msg; 1716 struct sockaddr_storage address; 1717 int err, err2; 1718 int fput_needed; 1719 1720 err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); 1721 if (unlikely(err)) 1722 return err; 1723 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1724 if (!sock) 1725 goto out; 1726 1727 msg.msg_control = NULL; 1728 msg.msg_controllen = 0; 1729 /* Save some cycles and don't copy the address if not needed */ 1730 msg.msg_name = addr ? (struct sockaddr *)&address : NULL; 1731 /* We assume all kernel code knows the size of sockaddr_storage */ 1732 msg.msg_namelen = 0; 1733 msg.msg_iocb = NULL; 1734 msg.msg_flags = 0; 1735 if (sock->file->f_flags & O_NONBLOCK) 1736 flags |= MSG_DONTWAIT; 1737 err = sock_recvmsg(sock, &msg, flags); 1738 1739 if (err >= 0 && addr != NULL) { 1740 err2 = move_addr_to_user(&address, 1741 msg.msg_namelen, addr, addr_len); 1742 if (err2 < 0) 1743 err = err2; 1744 } 1745 1746 fput_light(sock->file, fput_needed); 1747 out: 1748 return err; 1749 } 1750 1751 /* 1752 * Receive a datagram from a socket. 1753 */ 1754 1755 SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, 1756 unsigned int, flags) 1757 { 1758 return sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); 1759 } 1760 1761 /* 1762 * Set a socket option. Because we don't know the option lengths we have 1763 * to pass the user mode parameter for the protocols to sort out. 1764 */ 1765 1766 SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, 1767 char __user *, optval, int, optlen) 1768 { 1769 int err, fput_needed; 1770 struct socket *sock; 1771 1772 if (optlen < 0) 1773 return -EINVAL; 1774 1775 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1776 if (sock != NULL) { 1777 err = security_socket_setsockopt(sock, level, optname); 1778 if (err) 1779 goto out_put; 1780 1781 if (level == SOL_SOCKET) 1782 err = 1783 sock_setsockopt(sock, level, optname, optval, 1784 optlen); 1785 else 1786 err = 1787 sock->ops->setsockopt(sock, level, optname, optval, 1788 optlen); 1789 out_put: 1790 fput_light(sock->file, fput_needed); 1791 } 1792 return err; 1793 } 1794 1795 /* 1796 * Get a socket option. Because we don't know the option lengths we have 1797 * to pass a user mode parameter for the protocols to sort out. 1798 */ 1799 1800 SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, 1801 char __user *, optval, int __user *, optlen) 1802 { 1803 int err, fput_needed; 1804 struct socket *sock; 1805 1806 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1807 if (sock != NULL) { 1808 err = security_socket_getsockopt(sock, level, optname); 1809 if (err) 1810 goto out_put; 1811 1812 if (level == SOL_SOCKET) 1813 err = 1814 sock_getsockopt(sock, level, optname, optval, 1815 optlen); 1816 else 1817 err = 1818 sock->ops->getsockopt(sock, level, optname, optval, 1819 optlen); 1820 out_put: 1821 fput_light(sock->file, fput_needed); 1822 } 1823 return err; 1824 } 1825 1826 /* 1827 * Shutdown a socket. 1828 */ 1829 1830 SYSCALL_DEFINE2(shutdown, int, fd, int, how) 1831 { 1832 int err, fput_needed; 1833 struct socket *sock; 1834 1835 sock = sockfd_lookup_light(fd, &err, &fput_needed); 1836 if (sock != NULL) { 1837 err = security_socket_shutdown(sock, how); 1838 if (!err) 1839 err = sock->ops->shutdown(sock, how); 1840 fput_light(sock->file, fput_needed); 1841 } 1842 return err; 1843 } 1844 1845 /* A couple of helpful macros for getting the address of the 32/64 bit 1846 * fields which are the same type (int / unsigned) on our platforms. 1847 */ 1848 #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) 1849 #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) 1850 #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) 1851 1852 struct used_address { 1853 struct sockaddr_storage name; 1854 unsigned int name_len; 1855 }; 1856 1857 static int copy_msghdr_from_user(struct msghdr *kmsg, 1858 struct user_msghdr __user *umsg, 1859 struct sockaddr __user **save_addr, 1860 struct iovec **iov) 1861 { 1862 struct sockaddr __user *uaddr; 1863 struct iovec __user *uiov; 1864 size_t nr_segs; 1865 ssize_t err; 1866 1867 if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) || 1868 __get_user(uaddr, &umsg->msg_name) || 1869 __get_user(kmsg->msg_namelen, &umsg->msg_namelen) || 1870 __get_user(uiov, &umsg->msg_iov) || 1871 __get_user(nr_segs, &umsg->msg_iovlen) || 1872 __get_user(kmsg->msg_control, &umsg->msg_control) || 1873 __get_user(kmsg->msg_controllen, &umsg->msg_controllen) || 1874 __get_user(kmsg->msg_flags, &umsg->msg_flags)) 1875 return -EFAULT; 1876 1877 if (!uaddr) 1878 kmsg->msg_namelen = 0; 1879 1880 if (kmsg->msg_namelen < 0) 1881 return -EINVAL; 1882 1883 if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) 1884 kmsg->msg_namelen = sizeof(struct sockaddr_storage); 1885 1886 if (save_addr) 1887 *save_addr = uaddr; 1888 1889 if (uaddr && kmsg->msg_namelen) { 1890 if (!save_addr) { 1891 err = move_addr_to_kernel(uaddr, kmsg->msg_namelen, 1892 kmsg->msg_name); 1893 if (err < 0) 1894 return err; 1895 } 1896 } else { 1897 kmsg->msg_name = NULL; 1898 kmsg->msg_namelen = 0; 1899 } 1900 1901 if (nr_segs > UIO_MAXIOV) 1902 return -EMSGSIZE; 1903 1904 kmsg->msg_iocb = NULL; 1905 1906 return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs, 1907 UIO_FASTIOV, iov, &kmsg->msg_iter); 1908 } 1909 1910 static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, 1911 struct msghdr *msg_sys, unsigned int flags, 1912 struct used_address *used_address, 1913 unsigned int allowed_msghdr_flags) 1914 { 1915 struct compat_msghdr __user *msg_compat = 1916 (struct compat_msghdr __user *)msg; 1917 struct sockaddr_storage address; 1918 struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; 1919 unsigned char ctl[sizeof(struct cmsghdr) + 20] 1920 __aligned(sizeof(__kernel_size_t)); 1921 /* 20 is size of ipv6_pktinfo */ 1922 unsigned char *ctl_buf = ctl; 1923 int ctl_len; 1924 ssize_t err; 1925 1926 msg_sys->msg_name = &address; 1927 1928 if (MSG_CMSG_COMPAT & flags) 1929 err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); 1930 else 1931 err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); 1932 if (err < 0) 1933 return err; 1934 1935 err = -ENOBUFS; 1936 1937 if (msg_sys->msg_controllen > INT_MAX) 1938 goto out_freeiov; 1939 flags |= (msg_sys->msg_flags & allowed_msghdr_flags); 1940 ctl_len = msg_sys->msg_controllen; 1941 if ((MSG_CMSG_COMPAT & flags) && ctl_len) { 1942 err = 1943 cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, 1944 sizeof(ctl)); 1945 if (err) 1946 goto out_freeiov; 1947 ctl_buf = msg_sys->msg_control; 1948 ctl_len = msg_sys->msg_controllen; 1949 } else if (ctl_len) { 1950 BUILD_BUG_ON(sizeof(struct cmsghdr) != 1951 CMSG_ALIGN(sizeof(struct cmsghdr))); 1952 if (ctl_len > sizeof(ctl)) { 1953 ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); 1954 if (ctl_buf == NULL) 1955 goto out_freeiov; 1956 } 1957 err = -EFAULT; 1958 /* 1959 * Careful! Before this, msg_sys->msg_control contains a user pointer. 1960 * Afterwards, it will be a kernel pointer. Thus the compiler-assisted 1961 * checking falls down on this. 1962 */ 1963 if (copy_from_user(ctl_buf, 1964 (void __user __force *)msg_sys->msg_control, 1965 ctl_len)) 1966 goto out_freectl; 1967 msg_sys->msg_control = ctl_buf; 1968 } 1969 msg_sys->msg_flags = flags; 1970 1971 if (sock->file->f_flags & O_NONBLOCK) 1972 msg_sys->msg_flags |= MSG_DONTWAIT; 1973 /* 1974 * If this is sendmmsg() and current destination address is same as 1975 * previously succeeded address, omit asking LSM's decision. 1976 * used_address->name_len is initialized to UINT_MAX so that the first 1977 * destination address never matches. 1978 */ 1979 if (used_address && msg_sys->msg_name && 1980 used_address->name_len == msg_sys->msg_namelen && 1981 !memcmp(&used_address->name, msg_sys->msg_name, 1982 used_address->name_len)) { 1983 err = sock_sendmsg_nosec(sock, msg_sys); 1984 goto out_freectl; 1985 } 1986 err = sock_sendmsg(sock, msg_sys); 1987 /* 1988 * If this is sendmmsg() and sending to current destination address was 1989 * successful, remember it. 1990 */ 1991 if (used_address && err >= 0) { 1992 used_address->name_len = msg_sys->msg_namelen; 1993 if (msg_sys->msg_name) 1994 memcpy(&used_address->name, msg_sys->msg_name, 1995 used_address->name_len); 1996 } 1997 1998 out_freectl: 1999 if (ctl_buf != ctl) 2000 sock_kfree_s(sock->sk, ctl_buf, ctl_len); 2001 out_freeiov: 2002 kfree(iov); 2003 return err; 2004 } 2005 2006 /* 2007 * BSD sendmsg interface 2008 */ 2009 2010 long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2011 { 2012 int fput_needed, err; 2013 struct msghdr msg_sys; 2014 struct socket *sock; 2015 2016 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2017 if (!sock) 2018 goto out; 2019 2020 err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); 2021 2022 fput_light(sock->file, fput_needed); 2023 out: 2024 return err; 2025 } 2026 2027 SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) 2028 { 2029 if (flags & MSG_CMSG_COMPAT) 2030 return -EINVAL; 2031 return __sys_sendmsg(fd, msg, flags); 2032 } 2033 2034 /* 2035 * Linux sendmmsg interface 2036 */ 2037 2038 int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2039 unsigned int flags) 2040 { 2041 int fput_needed, err, datagrams; 2042 struct socket *sock; 2043 struct mmsghdr __user *entry; 2044 struct compat_mmsghdr __user *compat_entry; 2045 struct msghdr msg_sys; 2046 struct used_address used_address; 2047 unsigned int oflags = flags; 2048 2049 if (vlen > UIO_MAXIOV) 2050 vlen = UIO_MAXIOV; 2051 2052 datagrams = 0; 2053 2054 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2055 if (!sock) 2056 return err; 2057 2058 used_address.name_len = UINT_MAX; 2059 entry = mmsg; 2060 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2061 err = 0; 2062 flags |= MSG_BATCH; 2063 2064 while (datagrams < vlen) { 2065 if (datagrams == vlen - 1) 2066 flags = oflags; 2067 2068 if (MSG_CMSG_COMPAT & flags) { 2069 err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, 2070 &msg_sys, flags, &used_address, MSG_EOR); 2071 if (err < 0) 2072 break; 2073 err = __put_user(err, &compat_entry->msg_len); 2074 ++compat_entry; 2075 } else { 2076 err = ___sys_sendmsg(sock, 2077 (struct user_msghdr __user *)entry, 2078 &msg_sys, flags, &used_address, MSG_EOR); 2079 if (err < 0) 2080 break; 2081 err = put_user(err, &entry->msg_len); 2082 ++entry; 2083 } 2084 2085 if (err) 2086 break; 2087 ++datagrams; 2088 if (msg_data_left(&msg_sys)) 2089 break; 2090 cond_resched(); 2091 } 2092 2093 fput_light(sock->file, fput_needed); 2094 2095 /* We only return an error if no datagrams were able to be sent */ 2096 if (datagrams != 0) 2097 return datagrams; 2098 2099 return err; 2100 } 2101 2102 SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, 2103 unsigned int, vlen, unsigned int, flags) 2104 { 2105 if (flags & MSG_CMSG_COMPAT) 2106 return -EINVAL; 2107 return __sys_sendmmsg(fd, mmsg, vlen, flags); 2108 } 2109 2110 static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, 2111 struct msghdr *msg_sys, unsigned int flags, int nosec) 2112 { 2113 struct compat_msghdr __user *msg_compat = 2114 (struct compat_msghdr __user *)msg; 2115 struct iovec iovstack[UIO_FASTIOV]; 2116 struct iovec *iov = iovstack; 2117 unsigned long cmsg_ptr; 2118 int len; 2119 ssize_t err; 2120 2121 /* kernel mode address */ 2122 struct sockaddr_storage addr; 2123 2124 /* user mode address pointers */ 2125 struct sockaddr __user *uaddr; 2126 int __user *uaddr_len = COMPAT_NAMELEN(msg); 2127 2128 msg_sys->msg_name = &addr; 2129 2130 if (MSG_CMSG_COMPAT & flags) 2131 err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); 2132 else 2133 err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); 2134 if (err < 0) 2135 return err; 2136 2137 cmsg_ptr = (unsigned long)msg_sys->msg_control; 2138 msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 2139 2140 /* We assume all kernel code knows the size of sockaddr_storage */ 2141 msg_sys->msg_namelen = 0; 2142 2143 if (sock->file->f_flags & O_NONBLOCK) 2144 flags |= MSG_DONTWAIT; 2145 err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); 2146 if (err < 0) 2147 goto out_freeiov; 2148 len = err; 2149 2150 if (uaddr != NULL) { 2151 err = move_addr_to_user(&addr, 2152 msg_sys->msg_namelen, uaddr, 2153 uaddr_len); 2154 if (err < 0) 2155 goto out_freeiov; 2156 } 2157 err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), 2158 COMPAT_FLAGS(msg)); 2159 if (err) 2160 goto out_freeiov; 2161 if (MSG_CMSG_COMPAT & flags) 2162 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2163 &msg_compat->msg_controllen); 2164 else 2165 err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, 2166 &msg->msg_controllen); 2167 if (err) 2168 goto out_freeiov; 2169 err = len; 2170 2171 out_freeiov: 2172 kfree(iov); 2173 return err; 2174 } 2175 2176 /* 2177 * BSD recvmsg interface 2178 */ 2179 2180 long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags) 2181 { 2182 int fput_needed, err; 2183 struct msghdr msg_sys; 2184 struct socket *sock; 2185 2186 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2187 if (!sock) 2188 goto out; 2189 2190 err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); 2191 2192 fput_light(sock->file, fput_needed); 2193 out: 2194 return err; 2195 } 2196 2197 SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, 2198 unsigned int, flags) 2199 { 2200 if (flags & MSG_CMSG_COMPAT) 2201 return -EINVAL; 2202 return __sys_recvmsg(fd, msg, flags); 2203 } 2204 2205 /* 2206 * Linux recvmmsg interface 2207 */ 2208 2209 int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, 2210 unsigned int flags, struct timespec *timeout) 2211 { 2212 int fput_needed, err, datagrams; 2213 struct socket *sock; 2214 struct mmsghdr __user *entry; 2215 struct compat_mmsghdr __user *compat_entry; 2216 struct msghdr msg_sys; 2217 struct timespec64 end_time; 2218 struct timespec64 timeout64; 2219 2220 if (timeout && 2221 poll_select_set_timeout(&end_time, timeout->tv_sec, 2222 timeout->tv_nsec)) 2223 return -EINVAL; 2224 2225 datagrams = 0; 2226 2227 sock = sockfd_lookup_light(fd, &err, &fput_needed); 2228 if (!sock) 2229 return err; 2230 2231 err = sock_error(sock->sk); 2232 if (err) { 2233 datagrams = err; 2234 goto out_put; 2235 } 2236 2237 entry = mmsg; 2238 compat_entry = (struct compat_mmsghdr __user *)mmsg; 2239 2240 while (datagrams < vlen) { 2241 /* 2242 * No need to ask LSM for more than the first datagram. 2243 */ 2244 if (MSG_CMSG_COMPAT & flags) { 2245 err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, 2246 &msg_sys, flags & ~MSG_WAITFORONE, 2247 datagrams); 2248 if (err < 0) 2249 break; 2250 err = __put_user(err, &compat_entry->msg_len); 2251 ++compat_entry; 2252 } else { 2253 err = ___sys_recvmsg(sock, 2254 (struct user_msghdr __user *)entry, 2255 &msg_sys, flags & ~MSG_WAITFORONE, 2256 datagrams); 2257 if (err < 0) 2258 break; 2259 err = put_user(err, &entry->msg_len); 2260 ++entry; 2261 } 2262 2263 if (err) 2264 break; 2265 ++datagrams; 2266 2267 /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ 2268 if (flags & MSG_WAITFORONE) 2269 flags |= MSG_DONTWAIT; 2270 2271 if (timeout) { 2272 ktime_get_ts64(&timeout64); 2273 *timeout = timespec64_to_timespec( 2274 timespec64_sub(end_time, timeout64)); 2275 if (timeout->tv_sec < 0) { 2276 timeout->tv_sec = timeout->tv_nsec = 0; 2277 break; 2278 } 2279 2280 /* Timeout, return less than vlen datagrams */ 2281 if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) 2282 break; 2283 } 2284 2285 /* Out of band data, return right away */ 2286 if (msg_sys.msg_flags & MSG_OOB) 2287 break; 2288 cond_resched(); 2289 } 2290 2291 if (err == 0) 2292 goto out_put; 2293 2294 if (datagrams == 0) { 2295 datagrams = err; 2296 goto out_put; 2297 } 2298 2299 /* 2300 * We may return less entries than requested (vlen) if the 2301 * sock is non block and there aren't enough datagrams... 2302 */ 2303 if (err != -EAGAIN) { 2304 /* 2305 * ... or if recvmsg returns an error after we 2306 * received some datagrams, where we record the 2307 * error to return on the next call or if the 2308 * app asks about it using getsockopt(SO_ERROR). 2309 */ 2310 sock->sk->sk_err = -err; 2311 } 2312 out_put: 2313 fput_light(sock->file, fput_needed); 2314 2315 return datagrams; 2316 } 2317 2318 SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, 2319 unsigned int, vlen, unsigned int, flags, 2320 struct timespec __user *, timeout) 2321 { 2322 int datagrams; 2323 struct timespec timeout_sys; 2324 2325 if (flags & MSG_CMSG_COMPAT) 2326 return -EINVAL; 2327 2328 if (!timeout) 2329 return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL); 2330 2331 if (copy_from_user(&timeout_sys, timeout, sizeof(timeout_sys))) 2332 return -EFAULT; 2333 2334 datagrams = __sys_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); 2335 2336 if (datagrams > 0 && 2337 copy_to_user(timeout, &timeout_sys, sizeof(timeout_sys))) 2338 datagrams = -EFAULT; 2339 2340 return datagrams; 2341 } 2342 2343 #ifdef __ARCH_WANT_SYS_SOCKETCALL 2344 /* Argument list sizes for sys_socketcall */ 2345 #define AL(x) ((x) * sizeof(unsigned long)) 2346 static const unsigned char nargs[21] = { 2347 AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), 2348 AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), 2349 AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), 2350 AL(4), AL(5), AL(4) 2351 }; 2352 2353 #undef AL 2354 2355 /* 2356 * System call vectors. 2357 * 2358 * Argument checking cleaned up. Saved 20% in size. 2359 * This function doesn't need to set the kernel lock because 2360 * it is set by the callees. 2361 */ 2362 2363 SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) 2364 { 2365 unsigned long a[AUDITSC_ARGS]; 2366 unsigned long a0, a1; 2367 int err; 2368 unsigned int len; 2369 2370 if (call < 1 || call > SYS_SENDMMSG) 2371 return -EINVAL; 2372 2373 len = nargs[call]; 2374 if (len > sizeof(a)) 2375 return -EINVAL; 2376 2377 /* copy_from_user should be SMP safe. */ 2378 if (copy_from_user(a, args, len)) 2379 return -EFAULT; 2380 2381 err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); 2382 if (err) 2383 return err; 2384 2385 a0 = a[0]; 2386 a1 = a[1]; 2387 2388 switch (call) { 2389 case SYS_SOCKET: 2390 err = sys_socket(a0, a1, a[2]); 2391 break; 2392 case SYS_BIND: 2393 err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); 2394 break; 2395 case SYS_CONNECT: 2396 err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); 2397 break; 2398 case SYS_LISTEN: 2399 err = sys_listen(a0, a1); 2400 break; 2401 case SYS_ACCEPT: 2402 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2403 (int __user *)a[2], 0); 2404 break; 2405 case SYS_GETSOCKNAME: 2406 err = 2407 sys_getsockname(a0, (struct sockaddr __user *)a1, 2408 (int __user *)a[2]); 2409 break; 2410 case SYS_GETPEERNAME: 2411 err = 2412 sys_getpeername(a0, (struct sockaddr __user *)a1, 2413 (int __user *)a[2]); 2414 break; 2415 case SYS_SOCKETPAIR: 2416 err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); 2417 break; 2418 case SYS_SEND: 2419 err = sys_send(a0, (void __user *)a1, a[2], a[3]); 2420 break; 2421 case SYS_SENDTO: 2422 err = sys_sendto(a0, (void __user *)a1, a[2], a[3], 2423 (struct sockaddr __user *)a[4], a[5]); 2424 break; 2425 case SYS_RECV: 2426 err = sys_recv(a0, (void __user *)a1, a[2], a[3]); 2427 break; 2428 case SYS_RECVFROM: 2429 err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], 2430 (struct sockaddr __user *)a[4], 2431 (int __user *)a[5]); 2432 break; 2433 case SYS_SHUTDOWN: 2434 err = sys_shutdown(a0, a1); 2435 break; 2436 case SYS_SETSOCKOPT: 2437 err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); 2438 break; 2439 case SYS_GETSOCKOPT: 2440 err = 2441 sys_getsockopt(a0, a1, a[2], (char __user *)a[3], 2442 (int __user *)a[4]); 2443 break; 2444 case SYS_SENDMSG: 2445 err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2446 break; 2447 case SYS_SENDMMSG: 2448 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); 2449 break; 2450 case SYS_RECVMSG: 2451 err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]); 2452 break; 2453 case SYS_RECVMMSG: 2454 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], 2455 (struct timespec __user *)a[4]); 2456 break; 2457 case SYS_ACCEPT4: 2458 err = sys_accept4(a0, (struct sockaddr __user *)a1, 2459 (int __user *)a[2], a[3]); 2460 break; 2461 default: 2462 err = -EINVAL; 2463 break; 2464 } 2465 return err; 2466 } 2467 2468 #endif /* __ARCH_WANT_SYS_SOCKETCALL */ 2469 2470 /** 2471 * sock_register - add a socket protocol handler 2472 * @ops: description of protocol 2473 * 2474 * This function is called by a protocol handler that wants to 2475 * advertise its address family, and have it linked into the 2476 * socket interface. The value ops->family corresponds to the 2477 * socket system call protocol family. 2478 */ 2479 int sock_register(const struct net_proto_family *ops) 2480 { 2481 int err; 2482 2483 if (ops->family >= NPROTO) { 2484 pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); 2485 return -ENOBUFS; 2486 } 2487 2488 spin_lock(&net_family_lock); 2489 if (rcu_dereference_protected(net_families[ops->family], 2490 lockdep_is_held(&net_family_lock))) 2491 err = -EEXIST; 2492 else { 2493 rcu_assign_pointer(net_families[ops->family], ops); 2494 err = 0; 2495 } 2496 spin_unlock(&net_family_lock); 2497 2498 pr_info("NET: Registered protocol family %d\n", ops->family); 2499 return err; 2500 } 2501 EXPORT_SYMBOL(sock_register); 2502 2503 /** 2504 * sock_unregister - remove a protocol handler 2505 * @family: protocol family to remove 2506 * 2507 * This function is called by a protocol handler that wants to 2508 * remove its address family, and have it unlinked from the 2509 * new socket creation. 2510 * 2511 * If protocol handler is a module, then it can use module reference 2512 * counts to protect against new references. If protocol handler is not 2513 * a module then it needs to provide its own protection in 2514 * the ops->create routine. 2515 */ 2516 void sock_unregister(int family) 2517 { 2518 BUG_ON(family < 0 || family >= NPROTO); 2519 2520 spin_lock(&net_family_lock); 2521 RCU_INIT_POINTER(net_families[family], NULL); 2522 spin_unlock(&net_family_lock); 2523 2524 synchronize_rcu(); 2525 2526 pr_info("NET: Unregistered protocol family %d\n", family); 2527 } 2528 EXPORT_SYMBOL(sock_unregister); 2529 2530 static int __init sock_init(void) 2531 { 2532 int err; 2533 /* 2534 * Initialize the network sysctl infrastructure. 2535 */ 2536 err = net_sysctl_init(); 2537 if (err) 2538 goto out; 2539 2540 /* 2541 * Initialize skbuff SLAB cache 2542 */ 2543 skb_init(); 2544 2545 /* 2546 * Initialize the protocols module. 2547 */ 2548 2549 init_inodecache(); 2550 2551 err = register_filesystem(&sock_fs_type); 2552 if (err) 2553 goto out_fs; 2554 sock_mnt = kern_mount(&sock_fs_type); 2555 if (IS_ERR(sock_mnt)) { 2556 err = PTR_ERR(sock_mnt); 2557 goto out_mount; 2558 } 2559 2560 /* The real protocol initialization is performed in later initcalls. 2561 */ 2562 2563 #ifdef CONFIG_NETFILTER 2564 err = netfilter_init(); 2565 if (err) 2566 goto out; 2567 #endif 2568 2569 ptp_classifier_init(); 2570 2571 out: 2572 return err; 2573 2574 out_mount: 2575 unregister_filesystem(&sock_fs_type); 2576 out_fs: 2577 goto out; 2578 } 2579 2580 core_initcall(sock_init); /* early initcall */ 2581 2582 #ifdef CONFIG_PROC_FS 2583 void socket_seq_show(struct seq_file *seq) 2584 { 2585 int cpu; 2586 int counter = 0; 2587 2588 for_each_possible_cpu(cpu) 2589 counter += per_cpu(sockets_in_use, cpu); 2590 2591 /* It can be negative, by the way. 8) */ 2592 if (counter < 0) 2593 counter = 0; 2594 2595 seq_printf(seq, "sockets: used %d\n", counter); 2596 } 2597 #endif /* CONFIG_PROC_FS */ 2598 2599 #ifdef CONFIG_COMPAT 2600 static int do_siocgstamp(struct net *net, struct socket *sock, 2601 unsigned int cmd, void __user *up) 2602 { 2603 mm_segment_t old_fs = get_fs(); 2604 struct timeval ktv; 2605 int err; 2606 2607 set_fs(KERNEL_DS); 2608 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&ktv); 2609 set_fs(old_fs); 2610 if (!err) 2611 err = compat_put_timeval(&ktv, up); 2612 2613 return err; 2614 } 2615 2616 static int do_siocgstampns(struct net *net, struct socket *sock, 2617 unsigned int cmd, void __user *up) 2618 { 2619 mm_segment_t old_fs = get_fs(); 2620 struct timespec kts; 2621 int err; 2622 2623 set_fs(KERNEL_DS); 2624 err = sock_do_ioctl(net, sock, cmd, (unsigned long)&kts); 2625 set_fs(old_fs); 2626 if (!err) 2627 err = compat_put_timespec(&kts, up); 2628 2629 return err; 2630 } 2631 2632 static int dev_ifname32(struct net *net, struct compat_ifreq __user *uifr32) 2633 { 2634 struct ifreq __user *uifr; 2635 int err; 2636 2637 uifr = compat_alloc_user_space(sizeof(struct ifreq)); 2638 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2639 return -EFAULT; 2640 2641 err = dev_ioctl(net, SIOCGIFNAME, uifr); 2642 if (err) 2643 return err; 2644 2645 if (copy_in_user(uifr32, uifr, sizeof(struct compat_ifreq))) 2646 return -EFAULT; 2647 2648 return 0; 2649 } 2650 2651 static int dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) 2652 { 2653 struct compat_ifconf ifc32; 2654 struct ifconf ifc; 2655 struct ifconf __user *uifc; 2656 struct compat_ifreq __user *ifr32; 2657 struct ifreq __user *ifr; 2658 unsigned int i, j; 2659 int err; 2660 2661 if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) 2662 return -EFAULT; 2663 2664 memset(&ifc, 0, sizeof(ifc)); 2665 if (ifc32.ifcbuf == 0) { 2666 ifc32.ifc_len = 0; 2667 ifc.ifc_len = 0; 2668 ifc.ifc_req = NULL; 2669 uifc = compat_alloc_user_space(sizeof(struct ifconf)); 2670 } else { 2671 size_t len = ((ifc32.ifc_len / sizeof(struct compat_ifreq)) + 1) * 2672 sizeof(struct ifreq); 2673 uifc = compat_alloc_user_space(sizeof(struct ifconf) + len); 2674 ifc.ifc_len = len; 2675 ifr = ifc.ifc_req = (void __user *)(uifc + 1); 2676 ifr32 = compat_ptr(ifc32.ifcbuf); 2677 for (i = 0; i < ifc32.ifc_len; i += sizeof(struct compat_ifreq)) { 2678 if (copy_in_user(ifr, ifr32, sizeof(struct compat_ifreq))) 2679 return -EFAULT; 2680 ifr++; 2681 ifr32++; 2682 } 2683 } 2684 if (copy_to_user(uifc, &ifc, sizeof(struct ifconf))) 2685 return -EFAULT; 2686 2687 err = dev_ioctl(net, SIOCGIFCONF, uifc); 2688 if (err) 2689 return err; 2690 2691 if (copy_from_user(&ifc, uifc, sizeof(struct ifconf))) 2692 return -EFAULT; 2693 2694 ifr = ifc.ifc_req; 2695 ifr32 = compat_ptr(ifc32.ifcbuf); 2696 for (i = 0, j = 0; 2697 i + sizeof(struct compat_ifreq) <= ifc32.ifc_len && j < ifc.ifc_len; 2698 i += sizeof(struct compat_ifreq), j += sizeof(struct ifreq)) { 2699 if (copy_in_user(ifr32, ifr, sizeof(struct compat_ifreq))) 2700 return -EFAULT; 2701 ifr32++; 2702 ifr++; 2703 } 2704 2705 if (ifc32.ifcbuf == 0) { 2706 /* Translate from 64-bit structure multiple to 2707 * a 32-bit one. 2708 */ 2709 i = ifc.ifc_len; 2710 i = ((i / sizeof(struct ifreq)) * sizeof(struct compat_ifreq)); 2711 ifc32.ifc_len = i; 2712 } else { 2713 ifc32.ifc_len = i; 2714 } 2715 if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) 2716 return -EFAULT; 2717 2718 return 0; 2719 } 2720 2721 static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) 2722 { 2723 struct compat_ethtool_rxnfc __user *compat_rxnfc; 2724 bool convert_in = false, convert_out = false; 2725 size_t buf_size = ALIGN(sizeof(struct ifreq), 8); 2726 struct ethtool_rxnfc __user *rxnfc; 2727 struct ifreq __user *ifr; 2728 u32 rule_cnt = 0, actual_rule_cnt; 2729 u32 ethcmd; 2730 u32 data; 2731 int ret; 2732 2733 if (get_user(data, &ifr32->ifr_ifru.ifru_data)) 2734 return -EFAULT; 2735 2736 compat_rxnfc = compat_ptr(data); 2737 2738 if (get_user(ethcmd, &compat_rxnfc->cmd)) 2739 return -EFAULT; 2740 2741 /* Most ethtool structures are defined without padding. 2742 * Unfortunately struct ethtool_rxnfc is an exception. 2743 */ 2744 switch (ethcmd) { 2745 default: 2746 break; 2747 case ETHTOOL_GRXCLSRLALL: 2748 /* Buffer size is variable */ 2749 if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) 2750 return -EFAULT; 2751 if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) 2752 return -ENOMEM; 2753 buf_size += rule_cnt * sizeof(u32); 2754 /* fall through */ 2755 case ETHTOOL_GRXRINGS: 2756 case ETHTOOL_GRXCLSRLCNT: 2757 case ETHTOOL_GRXCLSRULE: 2758 case ETHTOOL_SRXCLSRLINS: 2759 convert_out = true; 2760 /* fall through */ 2761 case ETHTOOL_SRXCLSRLDEL: 2762 buf_size += sizeof(struct ethtool_rxnfc); 2763 convert_in = true; 2764 break; 2765 } 2766 2767 ifr = compat_alloc_user_space(buf_size); 2768 rxnfc = (void __user *)ifr + ALIGN(sizeof(struct ifreq), 8); 2769 2770 if (copy_in_user(&ifr->ifr_name, &ifr32->ifr_name, IFNAMSIZ)) 2771 return -EFAULT; 2772 2773 if (put_user(convert_in ? rxnfc : compat_ptr(data), 2774 &ifr->ifr_ifru.ifru_data)) 2775 return -EFAULT; 2776 2777 if (convert_in) { 2778 /* We expect there to be holes between fs.m_ext and 2779 * fs.ring_cookie and at the end of fs, but nowhere else. 2780 */ 2781 BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + 2782 sizeof(compat_rxnfc->fs.m_ext) != 2783 offsetof(struct ethtool_rxnfc, fs.m_ext) + 2784 sizeof(rxnfc->fs.m_ext)); 2785 BUILD_BUG_ON( 2786 offsetof(struct compat_ethtool_rxnfc, fs.location) - 2787 offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != 2788 offsetof(struct ethtool_rxnfc, fs.location) - 2789 offsetof(struct ethtool_rxnfc, fs.ring_cookie)); 2790 2791 if (copy_in_user(rxnfc, compat_rxnfc, 2792 (void __user *)(&rxnfc->fs.m_ext + 1) - 2793 (void __user *)rxnfc) || 2794 copy_in_user(&rxnfc->fs.ring_cookie, 2795 &compat_rxnfc->fs.ring_cookie, 2796 (void __user *)(&rxnfc->fs.location + 1) - 2797 (void __user *)&rxnfc->fs.ring_cookie) || 2798 copy_in_user(&rxnfc->rule_cnt, &compat_rxnfc->rule_cnt, 2799 sizeof(rxnfc->rule_cnt))) 2800 return -EFAULT; 2801 } 2802 2803 ret = dev_ioctl(net, SIOCETHTOOL, ifr); 2804 if (ret) 2805 return ret; 2806 2807 if (convert_out) { 2808 if (copy_in_user(compat_rxnfc, rxnfc, 2809 (const void __user *)(&rxnfc->fs.m_ext + 1) - 2810 (const void __user *)rxnfc) || 2811 copy_in_user(&compat_rxnfc->fs.ring_cookie, 2812 &rxnfc->fs.ring_cookie, 2813 (const void __user *)(&rxnfc->fs.location + 1) - 2814 (const void __user *)&rxnfc->fs.ring_cookie) || 2815 copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, 2816 sizeof(rxnfc->rule_cnt))) 2817 return -EFAULT; 2818 2819 if (ethcmd == ETHTOOL_GRXCLSRLALL) { 2820 /* As an optimisation, we only copy the actual 2821 * number of rules that the underlying 2822 * function returned. Since Mallory might 2823 * change the rule count in user memory, we 2824 * check that it is less than the rule count 2825 * originally given (as the user buffer size), 2826 * which has been range-checked. 2827 */ 2828 if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) 2829 return -EFAULT; 2830 if (actual_rule_cnt < rule_cnt) 2831 rule_cnt = actual_rule_cnt; 2832 if (copy_in_user(&compat_rxnfc->rule_locs[0], 2833 &rxnfc->rule_locs[0], 2834 rule_cnt * sizeof(u32))) 2835 return -EFAULT; 2836 } 2837 } 2838 2839 return 0; 2840 } 2841 2842 static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) 2843 { 2844 void __user *uptr; 2845 compat_uptr_t uptr32; 2846 struct ifreq __user *uifr; 2847 2848 uifr = compat_alloc_user_space(sizeof(*uifr)); 2849 if (copy_in_user(uifr, uifr32, sizeof(struct compat_ifreq))) 2850 return -EFAULT; 2851 2852 if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) 2853 return -EFAULT; 2854 2855 uptr = compat_ptr(uptr32); 2856 2857 if (put_user(uptr, &uifr->ifr_settings.ifs_ifsu.raw_hdlc)) 2858 return -EFAULT; 2859 2860 return dev_ioctl(net, SIOCWANDEV, uifr); 2861 } 2862 2863 static int bond_ioctl(struct net *net, unsigned int cmd, 2864 struct compat_ifreq __user *ifr32) 2865 { 2866 struct ifreq kifr; 2867 mm_segment_t old_fs; 2868 int err; 2869 2870 switch (cmd) { 2871 case SIOCBONDENSLAVE: 2872 case SIOCBONDRELEASE: 2873 case SIOCBONDSETHWADDR: 2874 case SIOCBONDCHANGEACTIVE: 2875 if (copy_from_user(&kifr, ifr32, sizeof(struct compat_ifreq))) 2876 return -EFAULT; 2877 2878 old_fs = get_fs(); 2879 set_fs(KERNEL_DS); 2880 err = dev_ioctl(net, cmd, 2881 (struct ifreq __user __force *) &kifr); 2882 set_fs(old_fs); 2883 2884 return err; 2885 default: 2886 return -ENOIOCTLCMD; 2887 } 2888 } 2889 2890 /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ 2891 static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, 2892 struct compat_ifreq __user *u_ifreq32) 2893 { 2894 struct ifreq __user *u_ifreq64; 2895 char tmp_buf[IFNAMSIZ]; 2896 void __user *data64; 2897 u32 data32; 2898 2899 if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]), 2900 IFNAMSIZ)) 2901 return -EFAULT; 2902 if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data)) 2903 return -EFAULT; 2904 data64 = compat_ptr(data32); 2905 2906 u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64)); 2907 2908 if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0], 2909 IFNAMSIZ)) 2910 return -EFAULT; 2911 if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data)) 2912 return -EFAULT; 2913 2914 return dev_ioctl(net, cmd, u_ifreq64); 2915 } 2916 2917 static int dev_ifsioc(struct net *net, struct socket *sock, 2918 unsigned int cmd, struct compat_ifreq __user *uifr32) 2919 { 2920 struct ifreq __user *uifr; 2921 int err; 2922 2923 uifr = compat_alloc_user_space(sizeof(*uifr)); 2924 if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) 2925 return -EFAULT; 2926 2927 err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); 2928 2929 if (!err) { 2930 switch (cmd) { 2931 case SIOCGIFFLAGS: 2932 case SIOCGIFMETRIC: 2933 case SIOCGIFMTU: 2934 case SIOCGIFMEM: 2935 case SIOCGIFHWADDR: 2936 case SIOCGIFINDEX: 2937 case SIOCGIFADDR: 2938 case SIOCGIFBRDADDR: 2939 case SIOCGIFDSTADDR: 2940 case SIOCGIFNETMASK: 2941 case SIOCGIFPFLAGS: 2942 case SIOCGIFTXQLEN: 2943 case SIOCGMIIPHY: 2944 case SIOCGMIIREG: 2945 if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) 2946 err = -EFAULT; 2947 break; 2948 } 2949 } 2950 return err; 2951 } 2952 2953 static int compat_sioc_ifmap(struct net *net, unsigned int cmd, 2954 struct compat_ifreq __user *uifr32) 2955 { 2956 struct ifreq ifr; 2957 struct compat_ifmap __user *uifmap32; 2958 mm_segment_t old_fs; 2959 int err; 2960 2961 uifmap32 = &uifr32->ifr_ifru.ifru_map; 2962 err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); 2963 err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2964 err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2965 err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2966 err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); 2967 err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); 2968 err |= get_user(ifr.ifr_map.port, &uifmap32->port); 2969 if (err) 2970 return -EFAULT; 2971 2972 old_fs = get_fs(); 2973 set_fs(KERNEL_DS); 2974 err = dev_ioctl(net, cmd, (void __user __force *)&ifr); 2975 set_fs(old_fs); 2976 2977 if (cmd == SIOCGIFMAP && !err) { 2978 err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); 2979 err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); 2980 err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); 2981 err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); 2982 err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); 2983 err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); 2984 err |= put_user(ifr.ifr_map.port, &uifmap32->port); 2985 if (err) 2986 err = -EFAULT; 2987 } 2988 return err; 2989 } 2990 2991 struct rtentry32 { 2992 u32 rt_pad1; 2993 struct sockaddr rt_dst; /* target address */ 2994 struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ 2995 struct sockaddr rt_genmask; /* target network mask (IP) */ 2996 unsigned short rt_flags; 2997 short rt_pad2; 2998 u32 rt_pad3; 2999 unsigned char rt_tos; 3000 unsigned char rt_class; 3001 short rt_pad4; 3002 short rt_metric; /* +1 for binary compatibility! */ 3003 /* char * */ u32 rt_dev; /* forcing the device at add */ 3004 u32 rt_mtu; /* per route MTU/Window */ 3005 u32 rt_window; /* Window clamping */ 3006 unsigned short rt_irtt; /* Initial RTT */ 3007 }; 3008 3009 struct in6_rtmsg32 { 3010 struct in6_addr rtmsg_dst; 3011 struct in6_addr rtmsg_src; 3012 struct in6_addr rtmsg_gateway; 3013 u32 rtmsg_type; 3014 u16 rtmsg_dst_len; 3015 u16 rtmsg_src_len; 3016 u32 rtmsg_metric; 3017 u32 rtmsg_info; 3018 u32 rtmsg_flags; 3019 s32 rtmsg_ifindex; 3020 }; 3021 3022 static int routing_ioctl(struct net *net, struct socket *sock, 3023 unsigned int cmd, void __user *argp) 3024 { 3025 int ret; 3026 void *r = NULL; 3027 struct in6_rtmsg r6; 3028 struct rtentry r4; 3029 char devname[16]; 3030 u32 rtdev; 3031 mm_segment_t old_fs = get_fs(); 3032 3033 if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ 3034 struct in6_rtmsg32 __user *ur6 = argp; 3035 ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), 3036 3 * sizeof(struct in6_addr)); 3037 ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); 3038 ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); 3039 ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); 3040 ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); 3041 ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); 3042 ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); 3043 ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); 3044 3045 r = (void *) &r6; 3046 } else { /* ipv4 */ 3047 struct rtentry32 __user *ur4 = argp; 3048 ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), 3049 3 * sizeof(struct sockaddr)); 3050 ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); 3051 ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); 3052 ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); 3053 ret |= get_user(r4.rt_window, &(ur4->rt_window)); 3054 ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); 3055 ret |= get_user(rtdev, &(ur4->rt_dev)); 3056 if (rtdev) { 3057 ret |= copy_from_user(devname, compat_ptr(rtdev), 15); 3058 r4.rt_dev = (char __user __force *)devname; 3059 devname[15] = 0; 3060 } else 3061 r4.rt_dev = NULL; 3062 3063 r = (void *) &r4; 3064 } 3065 3066 if (ret) { 3067 ret = -EFAULT; 3068 goto out; 3069 } 3070 3071 set_fs(KERNEL_DS); 3072 ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); 3073 set_fs(old_fs); 3074 3075 out: 3076 return ret; 3077 } 3078 3079 /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE 3080 * for some operations; this forces use of the newer bridge-utils that 3081 * use compatible ioctls 3082 */ 3083 static int old_bridge_ioctl(compat_ulong_t __user *argp) 3084 { 3085 compat_ulong_t tmp; 3086 3087 if (get_user(tmp, argp)) 3088 return -EFAULT; 3089 if (tmp == BRCTL_GET_VERSION) 3090 return BRCTL_VERSION + 1; 3091 return -EINVAL; 3092 } 3093 3094 static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, 3095 unsigned int cmd, unsigned long arg) 3096 { 3097 void __user *argp = compat_ptr(arg); 3098 struct sock *sk = sock->sk; 3099 struct net *net = sock_net(sk); 3100 3101 if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) 3102 return compat_ifr_data_ioctl(net, cmd, argp); 3103 3104 switch (cmd) { 3105 case SIOCSIFBR: 3106 case SIOCGIFBR: 3107 return old_bridge_ioctl(argp); 3108 case SIOCGIFNAME: 3109 return dev_ifname32(net, argp); 3110 case SIOCGIFCONF: 3111 return dev_ifconf(net, argp); 3112 case SIOCETHTOOL: 3113 return ethtool_ioctl(net, argp); 3114 case SIOCWANDEV: 3115 return compat_siocwandev(net, argp); 3116 case SIOCGIFMAP: 3117 case SIOCSIFMAP: 3118 return compat_sioc_ifmap(net, cmd, argp); 3119 case SIOCBONDENSLAVE: 3120 case SIOCBONDRELEASE: 3121 case SIOCBONDSETHWADDR: 3122 case SIOCBONDCHANGEACTIVE: 3123 return bond_ioctl(net, cmd, argp); 3124 case SIOCADDRT: 3125 case SIOCDELRT: 3126 return routing_ioctl(net, sock, cmd, argp); 3127 case SIOCGSTAMP: 3128 return do_siocgstamp(net, sock, cmd, argp); 3129 case SIOCGSTAMPNS: 3130 return do_siocgstampns(net, sock, cmd, argp); 3131 case SIOCBONDSLAVEINFOQUERY: 3132 case SIOCBONDINFOQUERY: 3133 case SIOCSHWTSTAMP: 3134 case SIOCGHWTSTAMP: 3135 return compat_ifr_data_ioctl(net, cmd, argp); 3136 3137 case FIOSETOWN: 3138 case SIOCSPGRP: 3139 case FIOGETOWN: 3140 case SIOCGPGRP: 3141 case SIOCBRADDBR: 3142 case SIOCBRDELBR: 3143 case SIOCGIFVLAN: 3144 case SIOCSIFVLAN: 3145 case SIOCADDDLCI: 3146 case SIOCDELDLCI: 3147 case SIOCGSKNS: 3148 return sock_ioctl(file, cmd, arg); 3149 3150 case SIOCGIFFLAGS: 3151 case SIOCSIFFLAGS: 3152 case SIOCGIFMETRIC: 3153 case SIOCSIFMETRIC: 3154 case SIOCGIFMTU: 3155 case SIOCSIFMTU: 3156 case SIOCGIFMEM: 3157 case SIOCSIFMEM: 3158 case SIOCGIFHWADDR: 3159 case SIOCSIFHWADDR: 3160 case SIOCADDMULTI: 3161 case SIOCDELMULTI: 3162 case SIOCGIFINDEX: 3163 case SIOCGIFADDR: 3164 case SIOCSIFADDR: 3165 case SIOCSIFHWBROADCAST: 3166 case SIOCDIFADDR: 3167 case SIOCGIFBRDADDR: 3168 case SIOCSIFBRDADDR: 3169 case SIOCGIFDSTADDR: 3170 case SIOCSIFDSTADDR: 3171 case SIOCGIFNETMASK: 3172 case SIOCSIFNETMASK: 3173 case SIOCSIFPFLAGS: 3174 case SIOCGIFPFLAGS: 3175 case SIOCGIFTXQLEN: 3176 case SIOCSIFTXQLEN: 3177 case SIOCBRADDIF: 3178 case SIOCBRDELIF: 3179 case SIOCSIFNAME: 3180 case SIOCGMIIPHY: 3181 case SIOCGMIIREG: 3182 case SIOCSMIIREG: 3183 return dev_ifsioc(net, sock, cmd, argp); 3184 3185 case SIOCSARP: 3186 case SIOCGARP: 3187 case SIOCDARP: 3188 case SIOCATMARK: 3189 return sock_do_ioctl(net, sock, cmd, arg); 3190 } 3191 3192 return -ENOIOCTLCMD; 3193 } 3194 3195 static long compat_sock_ioctl(struct file *file, unsigned int cmd, 3196 unsigned long arg) 3197 { 3198 struct socket *sock = file->private_data; 3199 int ret = -ENOIOCTLCMD; 3200 struct sock *sk; 3201 struct net *net; 3202 3203 sk = sock->sk; 3204 net = sock_net(sk); 3205 3206 if (sock->ops->compat_ioctl) 3207 ret = sock->ops->compat_ioctl(sock, cmd, arg); 3208 3209 if (ret == -ENOIOCTLCMD && 3210 (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) 3211 ret = compat_wext_handle_ioctl(net, cmd, arg); 3212 3213 if (ret == -ENOIOCTLCMD) 3214 ret = compat_sock_ioctl_trans(file, sock, cmd, arg); 3215 3216 return ret; 3217 } 3218 #endif 3219 3220 int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) 3221 { 3222 return sock->ops->bind(sock, addr, addrlen); 3223 } 3224 EXPORT_SYMBOL(kernel_bind); 3225 3226 int kernel_listen(struct socket *sock, int backlog) 3227 { 3228 return sock->ops->listen(sock, backlog); 3229 } 3230 EXPORT_SYMBOL(kernel_listen); 3231 3232 int kernel_accept(struct socket *sock, struct socket **newsock, int flags) 3233 { 3234 struct sock *sk = sock->sk; 3235 int err; 3236 3237 err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, 3238 newsock); 3239 if (err < 0) 3240 goto done; 3241 3242 err = sock->ops->accept(sock, *newsock, flags, true); 3243 if (err < 0) { 3244 sock_release(*newsock); 3245 *newsock = NULL; 3246 goto done; 3247 } 3248 3249 (*newsock)->ops = sock->ops; 3250 __module_get((*newsock)->ops->owner); 3251 3252 done: 3253 return err; 3254 } 3255 EXPORT_SYMBOL(kernel_accept); 3256 3257 int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, 3258 int flags) 3259 { 3260 return sock->ops->connect(sock, addr, addrlen, flags); 3261 } 3262 EXPORT_SYMBOL(kernel_connect); 3263 3264 int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 3265 int *addrlen) 3266 { 3267 return sock->ops->getname(sock, addr, addrlen, 0); 3268 } 3269 EXPORT_SYMBOL(kernel_getsockname); 3270 3271 int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 3272 int *addrlen) 3273 { 3274 return sock->ops->getname(sock, addr, addrlen, 1); 3275 } 3276 EXPORT_SYMBOL(kernel_getpeername); 3277 3278 int kernel_getsockopt(struct socket *sock, int level, int optname, 3279 char *optval, int *optlen) 3280 { 3281 mm_segment_t oldfs = get_fs(); 3282 char __user *uoptval; 3283 int __user *uoptlen; 3284 int err; 3285 3286 uoptval = (char __user __force *) optval; 3287 uoptlen = (int __user __force *) optlen; 3288 3289 set_fs(KERNEL_DS); 3290 if (level == SOL_SOCKET) 3291 err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); 3292 else 3293 err = sock->ops->getsockopt(sock, level, optname, uoptval, 3294 uoptlen); 3295 set_fs(oldfs); 3296 return err; 3297 } 3298 EXPORT_SYMBOL(kernel_getsockopt); 3299 3300 int kernel_setsockopt(struct socket *sock, int level, int optname, 3301 char *optval, unsigned int optlen) 3302 { 3303 mm_segment_t oldfs = get_fs(); 3304 char __user *uoptval; 3305 int err; 3306 3307 uoptval = (char __user __force *) optval; 3308 3309 set_fs(KERNEL_DS); 3310 if (level == SOL_SOCKET) 3311 err = sock_setsockopt(sock, level, optname, uoptval, optlen); 3312 else 3313 err = sock->ops->setsockopt(sock, level, optname, uoptval, 3314 optlen); 3315 set_fs(oldfs); 3316 return err; 3317 } 3318 EXPORT_SYMBOL(kernel_setsockopt); 3319 3320 int kernel_sendpage(struct socket *sock, struct page *page, int offset, 3321 size_t size, int flags) 3322 { 3323 if (sock->ops->sendpage) 3324 return sock->ops->sendpage(sock, page, offset, size, flags); 3325 3326 return sock_no_sendpage(sock, page, offset, size, flags); 3327 } 3328 EXPORT_SYMBOL(kernel_sendpage); 3329 3330 int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg) 3331 { 3332 mm_segment_t oldfs = get_fs(); 3333 int err; 3334 3335 set_fs(KERNEL_DS); 3336 err = sock->ops->ioctl(sock, cmd, arg); 3337 set_fs(oldfs); 3338 3339 return err; 3340 } 3341 EXPORT_SYMBOL(kernel_sock_ioctl); 3342 3343 int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) 3344 { 3345 return sock->ops->shutdown(sock, how); 3346 } 3347 EXPORT_SYMBOL(kernel_sock_shutdown); 3348