| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * NET An implementation of the SOCKET network access protocol. |
| 4 | * |
| 5 | * Version: @(#)socket.c 1.1.93 18/02/95 |
| 6 | * |
| 7 | * Authors: Orest Zborowski, <obz@Kodak.COM> |
| 8 | * Ross Biro |
| 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * |
| 11 | * Fixes: |
| 12 | * Anonymous : NOTSOCK/BADF cleanup. Error fix in |
| 13 | * shutdown() |
| 14 | * Alan Cox : verify_area() fixes |
| 15 | * Alan Cox : Removed DDI |
| 16 | * Jonathan Kamens : SOCK_DGRAM reconnect bug |
| 17 | * Alan Cox : Moved a load of checks to the very |
| 18 | * top level. |
| 19 | * Alan Cox : Move address structures to/from user |
| 20 | * mode above the protocol layers. |
| 21 | * Rob Janssen : Allow 0 length sends. |
| 22 | * Alan Cox : Asynchronous I/O support (cribbed from the |
| 23 | * tty drivers). |
| 24 | * Niibe Yutaka : Asynchronous I/O for writes (4.4BSD style) |
| 25 | * Jeff Uphoff : Made max number of sockets command-line |
| 26 | * configurable. |
| 27 | * Matti Aarnio : Made the number of sockets dynamic, |
| 28 | * to be allocated when needed, and mr. |
| 29 | * Uphoff's max is used as max to be |
| 30 | * allowed to allocate. |
| 31 | * Linus : Argh. removed all the socket allocation |
| 32 | * altogether: it's in the inode now. |
| 33 | * Alan Cox : Made sock_alloc()/sock_release() public |
| 34 | * for NetROM and future kernel nfsd type |
| 35 | * stuff. |
| 36 | * Alan Cox : sendmsg/recvmsg basics. |
| 37 | * Tom Dyas : Export net symbols. |
| 38 | * Marcin Dalecki : Fixed problems with CONFIG_NET="n". |
| 39 | * Alan Cox : Added thread locking to sys_* calls |
| 40 | * for sockets. May have errors at the |
| 41 | * moment. |
| 42 | * Kevin Buhr : Fixed the dumb errors in the above. |
| 43 | * Andi Kleen : Some small cleanups, optimizations, |
| 44 | * and fixed a copy_from_user() bug. |
| 45 | * Tigran Aivazian : sys_send(args) calls sys_sendto(args, NULL, 0) |
| 46 | * Tigran Aivazian : Made listen(2) backlog sanity checks |
| 47 | * protocol-independent |
| 48 | * |
| 49 | * This module is effectively the top level interface to the BSD socket |
| 50 | * paradigm. |
| 51 | * |
| 52 | * Based upon Swansea University Computer Society NET3.039 |
| 53 | */ |
| 54 | |
| 55 | #include <linux/mm.h> |
| 56 | #include <linux/socket.h> |
| 57 | #include <linux/file.h> |
| 58 | #include <linux/net.h> |
| 59 | #include <linux/interrupt.h> |
| 60 | #include <linux/thread_info.h> |
| 61 | #include <linux/rcupdate.h> |
| 62 | #include <linux/netdevice.h> |
| 63 | #include <linux/proc_fs.h> |
| 64 | #include <linux/seq_file.h> |
| 65 | #include <linux/mutex.h> |
| 66 | #include <linux/if_bridge.h> |
| 67 | #include <linux/if_frad.h> |
| 68 | #include <linux/if_vlan.h> |
| 69 | #include <linux/ptp_classify.h> |
| 70 | #include <linux/init.h> |
| 71 | #include <linux/poll.h> |
| 72 | #include <linux/cache.h> |
| 73 | #include <linux/module.h> |
| 74 | #include <linux/highmem.h> |
| 75 | #include <linux/mount.h> |
| 76 | #include <linux/pseudo_fs.h> |
| 77 | #include <linux/security.h> |
| 78 | #include <linux/syscalls.h> |
| 79 | #include <linux/compat.h> |
| 80 | #include <linux/kmod.h> |
| 81 | #include <linux/audit.h> |
| 82 | #include <linux/wireless.h> |
| 83 | #include <linux/nsproxy.h> |
| 84 | #include <linux/magic.h> |
| 85 | #include <linux/slab.h> |
| 86 | #include <linux/xattr.h> |
| 87 | #include <linux/nospec.h> |
| 88 | #include <linux/indirect_call_wrapper.h> |
| 89 | |
| 90 | #include <linux/uaccess.h> |
| 91 | #include <asm/unistd.h> |
| 92 | |
| 93 | #include <net/compat.h> |
| 94 | #include <net/wext.h> |
| 95 | #include <net/cls_cgroup.h> |
| 96 | |
| 97 | #include <net/sock.h> |
| 98 | #include <linux/netfilter.h> |
| 99 | |
| 100 | #include <linux/if_tun.h> |
| 101 | #include <linux/ipv6_route.h> |
| 102 | #include <linux/route.h> |
| 103 | #include <linux/sockios.h> |
| 104 | #include <net/busy_poll.h> |
| 105 | #include <linux/errqueue.h> |
| 106 | |
| 107 | #ifdef CONFIG_NET_RX_BUSY_POLL |
| 108 | unsigned int sysctl_net_busy_read __read_mostly; |
| 109 | unsigned int sysctl_net_busy_poll __read_mostly; |
| 110 | #endif |
| 111 | |
| 112 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to); |
| 113 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from); |
| 114 | static int sock_mmap(struct file *file, struct vm_area_struct *vma); |
| 115 | |
| 116 | static int sock_close(struct inode *inode, struct file *file); |
| 117 | static __poll_t sock_poll(struct file *file, |
| 118 | struct poll_table_struct *wait); |
| 119 | static long sock_ioctl(struct file *file, unsigned int cmd, unsigned long arg); |
| 120 | #ifdef CONFIG_COMPAT |
| 121 | static long compat_sock_ioctl(struct file *file, |
| 122 | unsigned int cmd, unsigned long arg); |
| 123 | #endif |
| 124 | static int sock_fasync(int fd, struct file *filp, int on); |
| 125 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 126 | int offset, size_t size, loff_t *ppos, int more); |
| 127 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
| 128 | struct pipe_inode_info *pipe, size_t len, |
| 129 | unsigned int flags); |
| 130 | |
| 131 | /* |
| 132 | * Socket files have a set of 'special' operations as well as the generic file ones. These don't appear |
| 133 | * in the operation structures but are done directly via the socketcall() multiplexor. |
| 134 | */ |
| 135 | |
| 136 | static const struct file_operations socket_file_ops = { |
| 137 | .owner = THIS_MODULE, |
| 138 | .llseek = no_llseek, |
| 139 | .read_iter = sock_read_iter, |
| 140 | .write_iter = sock_write_iter, |
| 141 | .poll = sock_poll, |
| 142 | .unlocked_ioctl = sock_ioctl, |
| 143 | #ifdef CONFIG_COMPAT |
| 144 | .compat_ioctl = compat_sock_ioctl, |
| 145 | #endif |
| 146 | .mmap = sock_mmap, |
| 147 | .release = sock_close, |
| 148 | .fasync = sock_fasync, |
| 149 | .sendpage = sock_sendpage, |
| 150 | .splice_write = generic_splice_sendpage, |
| 151 | .splice_read = sock_splice_read, |
| 152 | }; |
| 153 | |
| 154 | /* |
| 155 | * The protocol list. Each protocol is registered in here. |
| 156 | */ |
| 157 | |
| 158 | static DEFINE_SPINLOCK(net_family_lock); |
| 159 | static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly; |
| 160 | |
| 161 | /* |
| 162 | * Support routines. |
| 163 | * Move socket addresses back and forth across the kernel/user |
| 164 | * divide and look after the messy bits. |
| 165 | */ |
| 166 | |
| 167 | /** |
| 168 | * move_addr_to_kernel - copy a socket address into kernel space |
| 169 | * @uaddr: Address in user space |
| 170 | * @kaddr: Address in kernel space |
| 171 | * @ulen: Length in user space |
| 172 | * |
| 173 | * The address is copied into kernel space. If the provided address is |
| 174 | * too long an error code of -EINVAL is returned. If the copy gives |
| 175 | * invalid addresses -EFAULT is returned. On a success 0 is returned. |
| 176 | */ |
| 177 | |
| 178 | int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr) |
| 179 | { |
| 180 | if (ulen < 0 || ulen > sizeof(struct sockaddr_storage)) |
| 181 | return -EINVAL; |
| 182 | if (ulen == 0) |
| 183 | return 0; |
| 184 | if (copy_from_user(kaddr, uaddr, ulen)) |
| 185 | return -EFAULT; |
| 186 | return audit_sockaddr(ulen, kaddr); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * move_addr_to_user - copy an address to user space |
| 191 | * @kaddr: kernel space address |
| 192 | * @klen: length of address in kernel |
| 193 | * @uaddr: user space address |
| 194 | * @ulen: pointer to user length field |
| 195 | * |
| 196 | * The value pointed to by ulen on entry is the buffer length available. |
| 197 | * This is overwritten with the buffer space used. -EINVAL is returned |
| 198 | * if an overlong buffer is specified or a negative buffer size. -EFAULT |
| 199 | * is returned if either the buffer or the length field are not |
| 200 | * accessible. |
| 201 | * After copying the data up to the limit the user specifies, the true |
| 202 | * length of the data is written over the length limit the user |
| 203 | * specified. Zero is returned for a success. |
| 204 | */ |
| 205 | |
| 206 | static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, |
| 207 | void __user *uaddr, int __user *ulen) |
| 208 | { |
| 209 | int err; |
| 210 | int len; |
| 211 | |
| 212 | BUG_ON(klen > sizeof(struct sockaddr_storage)); |
| 213 | err = get_user(len, ulen); |
| 214 | if (err) |
| 215 | return err; |
| 216 | if (len > klen) |
| 217 | len = klen; |
| 218 | if (len < 0) |
| 219 | return -EINVAL; |
| 220 | if (len) { |
| 221 | if (audit_sockaddr(klen, kaddr)) |
| 222 | return -ENOMEM; |
| 223 | if (copy_to_user(uaddr, kaddr, len)) |
| 224 | return -EFAULT; |
| 225 | } |
| 226 | /* |
| 227 | * "fromlen shall refer to the value before truncation.." |
| 228 | * 1003.1g |
| 229 | */ |
| 230 | return __put_user(klen, ulen); |
| 231 | } |
| 232 | |
| 233 | static struct kmem_cache *sock_inode_cachep __ro_after_init; |
| 234 | |
| 235 | static struct inode *sock_alloc_inode(struct super_block *sb) |
| 236 | { |
| 237 | struct socket_alloc *ei; |
| 238 | |
| 239 | ei = kmem_cache_alloc(sock_inode_cachep, GFP_KERNEL); |
| 240 | if (!ei) |
| 241 | return NULL; |
| 242 | init_waitqueue_head(&ei->socket.wq.wait); |
| 243 | ei->socket.wq.fasync_list = NULL; |
| 244 | ei->socket.wq.flags = 0; |
| 245 | |
| 246 | ei->socket.state = SS_UNCONNECTED; |
| 247 | ei->socket.flags = 0; |
| 248 | ei->socket.ops = NULL; |
| 249 | ei->socket.sk = NULL; |
| 250 | ei->socket.file = NULL; |
| 251 | |
| 252 | return &ei->vfs_inode; |
| 253 | } |
| 254 | |
| 255 | static void sock_free_inode(struct inode *inode) |
| 256 | { |
| 257 | struct socket_alloc *ei; |
| 258 | |
| 259 | ei = container_of(inode, struct socket_alloc, vfs_inode); |
| 260 | kmem_cache_free(sock_inode_cachep, ei); |
| 261 | } |
| 262 | |
| 263 | static void init_once(void *foo) |
| 264 | { |
| 265 | struct socket_alloc *ei = (struct socket_alloc *)foo; |
| 266 | |
| 267 | inode_init_once(&ei->vfs_inode); |
| 268 | } |
| 269 | |
| 270 | static void init_inodecache(void) |
| 271 | { |
| 272 | sock_inode_cachep = kmem_cache_create("sock_inode_cache", |
| 273 | sizeof(struct socket_alloc), |
| 274 | 0, |
| 275 | (SLAB_HWCACHE_ALIGN | |
| 276 | SLAB_RECLAIM_ACCOUNT | |
| 277 | SLAB_MEM_SPREAD | SLAB_ACCOUNT), |
| 278 | init_once); |
| 279 | BUG_ON(sock_inode_cachep == NULL); |
| 280 | } |
| 281 | |
| 282 | static const struct super_operations sockfs_ops = { |
| 283 | .alloc_inode = sock_alloc_inode, |
| 284 | .free_inode = sock_free_inode, |
| 285 | .statfs = simple_statfs, |
| 286 | }; |
| 287 | |
| 288 | /* |
| 289 | * sockfs_dname() is called from d_path(). |
| 290 | */ |
| 291 | static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen) |
| 292 | { |
| 293 | return dynamic_dname(dentry, buffer, buflen, "socket:[%lu]", |
| 294 | d_inode(dentry)->i_ino); |
| 295 | } |
| 296 | |
| 297 | static const struct dentry_operations sockfs_dentry_operations = { |
| 298 | .d_dname = sockfs_dname, |
| 299 | }; |
| 300 | |
| 301 | static int sockfs_xattr_get(const struct xattr_handler *handler, |
| 302 | struct dentry *dentry, struct inode *inode, |
| 303 | const char *suffix, void *value, size_t size) |
| 304 | { |
| 305 | if (value) { |
| 306 | if (dentry->d_name.len + 1 > size) |
| 307 | return -ERANGE; |
| 308 | memcpy(value, dentry->d_name.name, dentry->d_name.len + 1); |
| 309 | } |
| 310 | return dentry->d_name.len + 1; |
| 311 | } |
| 312 | |
| 313 | #define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname" |
| 314 | #define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX) |
| 315 | #define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1) |
| 316 | |
| 317 | static const struct xattr_handler sockfs_xattr_handler = { |
| 318 | .name = XATTR_NAME_SOCKPROTONAME, |
| 319 | .get = sockfs_xattr_get, |
| 320 | }; |
| 321 | |
| 322 | static int sockfs_security_xattr_set(const struct xattr_handler *handler, |
| 323 | struct dentry *dentry, struct inode *inode, |
| 324 | const char *suffix, const void *value, |
| 325 | size_t size, int flags) |
| 326 | { |
| 327 | /* Handled by LSM. */ |
| 328 | return -EAGAIN; |
| 329 | } |
| 330 | |
| 331 | static const struct xattr_handler sockfs_security_xattr_handler = { |
| 332 | .prefix = XATTR_SECURITY_PREFIX, |
| 333 | .set = sockfs_security_xattr_set, |
| 334 | }; |
| 335 | |
| 336 | static const struct xattr_handler *sockfs_xattr_handlers[] = { |
| 337 | &sockfs_xattr_handler, |
| 338 | &sockfs_security_xattr_handler, |
| 339 | NULL |
| 340 | }; |
| 341 | |
| 342 | static int sockfs_init_fs_context(struct fs_context *fc) |
| 343 | { |
| 344 | struct pseudo_fs_context *ctx = init_pseudo(fc, SOCKFS_MAGIC); |
| 345 | if (!ctx) |
| 346 | return -ENOMEM; |
| 347 | ctx->ops = &sockfs_ops; |
| 348 | ctx->dops = &sockfs_dentry_operations; |
| 349 | ctx->xattr = sockfs_xattr_handlers; |
| 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static struct vfsmount *sock_mnt __read_mostly; |
| 354 | |
| 355 | static struct file_system_type sock_fs_type = { |
| 356 | .name = "sockfs", |
| 357 | .init_fs_context = sockfs_init_fs_context, |
| 358 | .kill_sb = kill_anon_super, |
| 359 | }; |
| 360 | |
| 361 | /* |
| 362 | * Obtains the first available file descriptor and sets it up for use. |
| 363 | * |
| 364 | * These functions create file structures and maps them to fd space |
| 365 | * of the current process. On success it returns file descriptor |
| 366 | * and file struct implicitly stored in sock->file. |
| 367 | * Note that another thread may close file descriptor before we return |
| 368 | * from this function. We use the fact that now we do not refer |
| 369 | * to socket after mapping. If one day we will need it, this |
| 370 | * function will increment ref. count on file by 1. |
| 371 | * |
| 372 | * In any case returned fd MAY BE not valid! |
| 373 | * This race condition is unavoidable |
| 374 | * with shared fd spaces, we cannot solve it inside kernel, |
| 375 | * but we take care of internal coherence yet. |
| 376 | */ |
| 377 | |
| 378 | /** |
| 379 | * sock_alloc_file - Bind a &socket to a &file |
| 380 | * @sock: socket |
| 381 | * @flags: file status flags |
| 382 | * @dname: protocol name |
| 383 | * |
| 384 | * Returns the &file bound with @sock, implicitly storing it |
| 385 | * in sock->file. If dname is %NULL, sets to "". |
| 386 | * On failure the return is a ERR pointer (see linux/err.h). |
| 387 | * This function uses GFP_KERNEL internally. |
| 388 | */ |
| 389 | |
| 390 | struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname) |
| 391 | { |
| 392 | struct file *file; |
| 393 | |
| 394 | if (!dname) |
| 395 | dname = sock->sk ? sock->sk->sk_prot_creator->name : ""; |
| 396 | |
| 397 | file = alloc_file_pseudo(SOCK_INODE(sock), sock_mnt, dname, |
| 398 | O_RDWR | (flags & O_NONBLOCK), |
| 399 | &socket_file_ops); |
| 400 | if (IS_ERR(file)) { |
| 401 | sock_release(sock); |
| 402 | return file; |
| 403 | } |
| 404 | |
| 405 | sock->file = file; |
| 406 | file->private_data = sock; |
| 407 | return file; |
| 408 | } |
| 409 | EXPORT_SYMBOL(sock_alloc_file); |
| 410 | |
| 411 | static int sock_map_fd(struct socket *sock, int flags) |
| 412 | { |
| 413 | struct file *newfile; |
| 414 | int fd = get_unused_fd_flags(flags); |
| 415 | if (unlikely(fd < 0)) { |
| 416 | sock_release(sock); |
| 417 | return fd; |
| 418 | } |
| 419 | |
| 420 | newfile = sock_alloc_file(sock, flags, NULL); |
| 421 | if (!IS_ERR(newfile)) { |
| 422 | fd_install(fd, newfile); |
| 423 | return fd; |
| 424 | } |
| 425 | |
| 426 | put_unused_fd(fd); |
| 427 | return PTR_ERR(newfile); |
| 428 | } |
| 429 | |
| 430 | /** |
| 431 | * sock_from_file - Return the &socket bounded to @file. |
| 432 | * @file: file |
| 433 | * @err: pointer to an error code return |
| 434 | * |
| 435 | * On failure returns %NULL and assigns -ENOTSOCK to @err. |
| 436 | */ |
| 437 | |
| 438 | struct socket *sock_from_file(struct file *file, int *err) |
| 439 | { |
| 440 | if (file->f_op == &socket_file_ops) |
| 441 | return file->private_data; /* set in sock_map_fd */ |
| 442 | |
| 443 | *err = -ENOTSOCK; |
| 444 | return NULL; |
| 445 | } |
| 446 | EXPORT_SYMBOL(sock_from_file); |
| 447 | |
| 448 | /** |
| 449 | * sockfd_lookup - Go from a file number to its socket slot |
| 450 | * @fd: file handle |
| 451 | * @err: pointer to an error code return |
| 452 | * |
| 453 | * The file handle passed in is locked and the socket it is bound |
| 454 | * to is returned. If an error occurs the err pointer is overwritten |
| 455 | * with a negative errno code and NULL is returned. The function checks |
| 456 | * for both invalid handles and passing a handle which is not a socket. |
| 457 | * |
| 458 | * On a success the socket object pointer is returned. |
| 459 | */ |
| 460 | |
| 461 | struct socket *sockfd_lookup(int fd, int *err) |
| 462 | { |
| 463 | struct file *file; |
| 464 | struct socket *sock; |
| 465 | |
| 466 | file = fget(fd); |
| 467 | if (!file) { |
| 468 | *err = -EBADF; |
| 469 | return NULL; |
| 470 | } |
| 471 | |
| 472 | sock = sock_from_file(file, err); |
| 473 | if (!sock) |
| 474 | fput(file); |
| 475 | return sock; |
| 476 | } |
| 477 | EXPORT_SYMBOL(sockfd_lookup); |
| 478 | |
| 479 | static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed) |
| 480 | { |
| 481 | struct fd f = fdget(fd); |
| 482 | struct socket *sock; |
| 483 | |
| 484 | *err = -EBADF; |
| 485 | if (f.file) { |
| 486 | sock = sock_from_file(f.file, err); |
| 487 | if (likely(sock)) { |
| 488 | *fput_needed = f.flags; |
| 489 | return sock; |
| 490 | } |
| 491 | fdput(f); |
| 492 | } |
| 493 | return NULL; |
| 494 | } |
| 495 | |
| 496 | static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer, |
| 497 | size_t size) |
| 498 | { |
| 499 | ssize_t len; |
| 500 | ssize_t used = 0; |
| 501 | |
| 502 | len = security_inode_listsecurity(d_inode(dentry), buffer, size); |
| 503 | if (len < 0) |
| 504 | return len; |
| 505 | used += len; |
| 506 | if (buffer) { |
| 507 | if (size < used) |
| 508 | return -ERANGE; |
| 509 | buffer += len; |
| 510 | } |
| 511 | |
| 512 | len = (XATTR_NAME_SOCKPROTONAME_LEN + 1); |
| 513 | used += len; |
| 514 | if (buffer) { |
| 515 | if (size < used) |
| 516 | return -ERANGE; |
| 517 | memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len); |
| 518 | buffer += len; |
| 519 | } |
| 520 | |
| 521 | return used; |
| 522 | } |
| 523 | |
| 524 | static int sockfs_setattr(struct dentry *dentry, struct iattr *iattr) |
| 525 | { |
| 526 | int err = simple_setattr(dentry, iattr); |
| 527 | |
| 528 | if (!err && (iattr->ia_valid & ATTR_UID)) { |
| 529 | struct socket *sock = SOCKET_I(d_inode(dentry)); |
| 530 | |
| 531 | if (sock->sk) |
| 532 | sock->sk->sk_uid = iattr->ia_uid; |
| 533 | else |
| 534 | err = -ENOENT; |
| 535 | } |
| 536 | |
| 537 | return err; |
| 538 | } |
| 539 | |
| 540 | static const struct inode_operations sockfs_inode_ops = { |
| 541 | .listxattr = sockfs_listxattr, |
| 542 | .setattr = sockfs_setattr, |
| 543 | }; |
| 544 | |
| 545 | /** |
| 546 | * sock_alloc - allocate a socket |
| 547 | * |
| 548 | * Allocate a new inode and socket object. The two are bound together |
| 549 | * and initialised. The socket is then returned. If we are out of inodes |
| 550 | * NULL is returned. This functions uses GFP_KERNEL internally. |
| 551 | */ |
| 552 | |
| 553 | struct socket *sock_alloc(void) |
| 554 | { |
| 555 | struct inode *inode; |
| 556 | struct socket *sock; |
| 557 | |
| 558 | inode = new_inode_pseudo(sock_mnt->mnt_sb); |
| 559 | if (!inode) |
| 560 | return NULL; |
| 561 | |
| 562 | sock = SOCKET_I(inode); |
| 563 | |
| 564 | inode->i_ino = get_next_ino(); |
| 565 | inode->i_mode = S_IFSOCK | S_IRWXUGO; |
| 566 | inode->i_uid = current_fsuid(); |
| 567 | inode->i_gid = current_fsgid(); |
| 568 | inode->i_op = &sockfs_inode_ops; |
| 569 | |
| 570 | return sock; |
| 571 | } |
| 572 | EXPORT_SYMBOL(sock_alloc); |
| 573 | |
| 574 | /** |
| 575 | * sock_release - close a socket |
| 576 | * @sock: socket to close |
| 577 | * |
| 578 | * The socket is released from the protocol stack if it has a release |
| 579 | * callback, and the inode is then released if the socket is bound to |
| 580 | * an inode not a file. |
| 581 | */ |
| 582 | |
| 583 | static void __sock_release(struct socket *sock, struct inode *inode) |
| 584 | { |
| 585 | if (sock->ops) { |
| 586 | struct module *owner = sock->ops->owner; |
| 587 | |
| 588 | if (inode) |
| 589 | inode_lock(inode); |
| 590 | sock->ops->release(sock); |
| 591 | sock->sk = NULL; |
| 592 | if (inode) |
| 593 | inode_unlock(inode); |
| 594 | sock->ops = NULL; |
| 595 | module_put(owner); |
| 596 | } |
| 597 | |
| 598 | if (sock->wq.fasync_list) |
| 599 | pr_err("%s: fasync list not empty!\n", __func__); |
| 600 | |
| 601 | if (!sock->file) { |
| 602 | iput(SOCK_INODE(sock)); |
| 603 | return; |
| 604 | } |
| 605 | sock->file = NULL; |
| 606 | } |
| 607 | |
| 608 | void sock_release(struct socket *sock) |
| 609 | { |
| 610 | __sock_release(sock, 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 | INDIRECT_CALLABLE_DECLARE(int inet_sendmsg(struct socket *, struct msghdr *, |
| 632 | size_t)); |
| 633 | INDIRECT_CALLABLE_DECLARE(int inet6_sendmsg(struct socket *, struct msghdr *, |
| 634 | size_t)); |
| 635 | static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg) |
| 636 | { |
| 637 | int ret = INDIRECT_CALL_INET(sock->ops->sendmsg, inet6_sendmsg, |
| 638 | inet_sendmsg, sock, msg, |
| 639 | msg_data_left(msg)); |
| 640 | BUG_ON(ret == -EIOCBQUEUED); |
| 641 | return ret; |
| 642 | } |
| 643 | |
| 644 | /** |
| 645 | * sock_sendmsg - send a message through @sock |
| 646 | * @sock: socket |
| 647 | * @msg: message to send |
| 648 | * |
| 649 | * Sends @msg through @sock, passing through LSM. |
| 650 | * Returns the number of bytes sent, or an error code. |
| 651 | */ |
| 652 | int sock_sendmsg(struct socket *sock, struct msghdr *msg) |
| 653 | { |
| 654 | int err = security_socket_sendmsg(sock, msg, |
| 655 | msg_data_left(msg)); |
| 656 | |
| 657 | return err ?: sock_sendmsg_nosec(sock, msg); |
| 658 | } |
| 659 | EXPORT_SYMBOL(sock_sendmsg); |
| 660 | |
| 661 | /** |
| 662 | * kernel_sendmsg - send a message through @sock (kernel-space) |
| 663 | * @sock: socket |
| 664 | * @msg: message header |
| 665 | * @vec: kernel vec |
| 666 | * @num: vec array length |
| 667 | * @size: total message data size |
| 668 | * |
| 669 | * Builds the message data with @vec and sends it through @sock. |
| 670 | * Returns the number of bytes sent, or an error code. |
| 671 | */ |
| 672 | |
| 673 | int kernel_sendmsg(struct socket *sock, struct msghdr *msg, |
| 674 | struct kvec *vec, size_t num, size_t size) |
| 675 | { |
| 676 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
| 677 | return sock_sendmsg(sock, msg); |
| 678 | } |
| 679 | EXPORT_SYMBOL(kernel_sendmsg); |
| 680 | |
| 681 | /** |
| 682 | * kernel_sendmsg_locked - send a message through @sock (kernel-space) |
| 683 | * @sk: sock |
| 684 | * @msg: message header |
| 685 | * @vec: output s/g array |
| 686 | * @num: output s/g array length |
| 687 | * @size: total message data size |
| 688 | * |
| 689 | * Builds the message data with @vec and sends it through @sock. |
| 690 | * Returns the number of bytes sent, or an error code. |
| 691 | * Caller must hold @sk. |
| 692 | */ |
| 693 | |
| 694 | int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg, |
| 695 | struct kvec *vec, size_t num, size_t size) |
| 696 | { |
| 697 | struct socket *sock = sk->sk_socket; |
| 698 | |
| 699 | if (!sock->ops->sendmsg_locked) |
| 700 | return sock_no_sendmsg_locked(sk, msg, size); |
| 701 | |
| 702 | iov_iter_kvec(&msg->msg_iter, WRITE, vec, num, size); |
| 703 | |
| 704 | return sock->ops->sendmsg_locked(sk, msg, msg_data_left(msg)); |
| 705 | } |
| 706 | EXPORT_SYMBOL(kernel_sendmsg_locked); |
| 707 | |
| 708 | static bool skb_is_err_queue(const struct sk_buff *skb) |
| 709 | { |
| 710 | /* pkt_type of skbs enqueued on the error queue are set to |
| 711 | * PACKET_OUTGOING in skb_set_err_queue(). This is only safe to do |
| 712 | * in recvmsg, since skbs received on a local socket will never |
| 713 | * have a pkt_type of PACKET_OUTGOING. |
| 714 | */ |
| 715 | return skb->pkt_type == PACKET_OUTGOING; |
| 716 | } |
| 717 | |
| 718 | /* On transmit, software and hardware timestamps are returned independently. |
| 719 | * As the two skb clones share the hardware timestamp, which may be updated |
| 720 | * before the software timestamp is received, a hardware TX timestamp may be |
| 721 | * returned only if there is no software TX timestamp. Ignore false software |
| 722 | * timestamps, which may be made in the __sock_recv_timestamp() call when the |
| 723 | * option SO_TIMESTAMP_OLD(NS) is enabled on the socket, even when the skb has a |
| 724 | * hardware timestamp. |
| 725 | */ |
| 726 | static bool skb_is_swtx_tstamp(const struct sk_buff *skb, int false_tstamp) |
| 727 | { |
| 728 | return skb->tstamp && !false_tstamp && skb_is_err_queue(skb); |
| 729 | } |
| 730 | |
| 731 | static void put_ts_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 732 | { |
| 733 | struct scm_ts_pktinfo ts_pktinfo; |
| 734 | struct net_device *orig_dev; |
| 735 | |
| 736 | if (!skb_mac_header_was_set(skb)) |
| 737 | return; |
| 738 | |
| 739 | memset(&ts_pktinfo, 0, sizeof(ts_pktinfo)); |
| 740 | |
| 741 | rcu_read_lock(); |
| 742 | orig_dev = dev_get_by_napi_id(skb_napi_id(skb)); |
| 743 | if (orig_dev) |
| 744 | ts_pktinfo.if_index = orig_dev->ifindex; |
| 745 | rcu_read_unlock(); |
| 746 | |
| 747 | ts_pktinfo.pkt_length = skb->len - skb_mac_offset(skb); |
| 748 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO, |
| 749 | sizeof(ts_pktinfo), &ts_pktinfo); |
| 750 | } |
| 751 | |
| 752 | /* |
| 753 | * called from sock_recv_timestamp() if sock_flag(sk, SOCK_RCVTSTAMP) |
| 754 | */ |
| 755 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, |
| 756 | struct sk_buff *skb) |
| 757 | { |
| 758 | int need_software_tstamp = sock_flag(sk, SOCK_RCVTSTAMP); |
| 759 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
| 760 | struct scm_timestamping_internal tss; |
| 761 | |
| 762 | int empty = 1, false_tstamp = 0; |
| 763 | struct skb_shared_hwtstamps *shhwtstamps = |
| 764 | skb_hwtstamps(skb); |
| 765 | |
| 766 | /* Race occurred between timestamp enabling and packet |
| 767 | receiving. Fill in the current time for now. */ |
| 768 | if (need_software_tstamp && skb->tstamp == 0) { |
| 769 | __net_timestamp(skb); |
| 770 | false_tstamp = 1; |
| 771 | } |
| 772 | |
| 773 | if (need_software_tstamp) { |
| 774 | if (!sock_flag(sk, SOCK_RCVTSTAMPNS)) { |
| 775 | if (new_tstamp) { |
| 776 | struct __kernel_sock_timeval tv; |
| 777 | |
| 778 | skb_get_new_timestamp(skb, &tv); |
| 779 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, |
| 780 | sizeof(tv), &tv); |
| 781 | } else { |
| 782 | struct __kernel_old_timeval tv; |
| 783 | |
| 784 | skb_get_timestamp(skb, &tv); |
| 785 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, |
| 786 | sizeof(tv), &tv); |
| 787 | } |
| 788 | } else { |
| 789 | if (new_tstamp) { |
| 790 | struct __kernel_timespec ts; |
| 791 | |
| 792 | skb_get_new_timestampns(skb, &ts); |
| 793 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, |
| 794 | sizeof(ts), &ts); |
| 795 | } else { |
| 796 | struct timespec ts; |
| 797 | |
| 798 | skb_get_timestampns(skb, &ts); |
| 799 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, |
| 800 | sizeof(ts), &ts); |
| 801 | } |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | memset(&tss, 0, sizeof(tss)); |
| 806 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) && |
| 807 | ktime_to_timespec64_cond(skb->tstamp, tss.ts + 0)) |
| 808 | empty = 0; |
| 809 | if (shhwtstamps && |
| 810 | (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
| 811 | !skb_is_swtx_tstamp(skb, false_tstamp) && |
| 812 | ktime_to_timespec64_cond(shhwtstamps->hwtstamp, tss.ts + 2)) { |
| 813 | empty = 0; |
| 814 | if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_PKTINFO) && |
| 815 | !skb_is_err_queue(skb)) |
| 816 | put_ts_pktinfo(msg, skb); |
| 817 | } |
| 818 | if (!empty) { |
| 819 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) |
| 820 | put_cmsg_scm_timestamping64(msg, &tss); |
| 821 | else |
| 822 | put_cmsg_scm_timestamping(msg, &tss); |
| 823 | |
| 824 | if (skb_is_err_queue(skb) && skb->len && |
| 825 | SKB_EXT_ERR(skb)->opt_stats) |
| 826 | put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING_OPT_STATS, |
| 827 | skb->len, skb->data); |
| 828 | } |
| 829 | } |
| 830 | EXPORT_SYMBOL_GPL(__sock_recv_timestamp); |
| 831 | |
| 832 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk, |
| 833 | struct sk_buff *skb) |
| 834 | { |
| 835 | int ack; |
| 836 | |
| 837 | if (!sock_flag(sk, SOCK_WIFI_STATUS)) |
| 838 | return; |
| 839 | if (!skb->wifi_acked_valid) |
| 840 | return; |
| 841 | |
| 842 | ack = skb->wifi_acked; |
| 843 | |
| 844 | put_cmsg(msg, SOL_SOCKET, SCM_WIFI_STATUS, sizeof(ack), &ack); |
| 845 | } |
| 846 | EXPORT_SYMBOL_GPL(__sock_recv_wifi_status); |
| 847 | |
| 848 | static inline void sock_recv_drops(struct msghdr *msg, struct sock *sk, |
| 849 | struct sk_buff *skb) |
| 850 | { |
| 851 | if (sock_flag(sk, SOCK_RXQ_OVFL) && skb && SOCK_SKB_CB(skb)->dropcount) |
| 852 | put_cmsg(msg, SOL_SOCKET, SO_RXQ_OVFL, |
| 853 | sizeof(__u32), &SOCK_SKB_CB(skb)->dropcount); |
| 854 | } |
| 855 | |
| 856 | void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk, |
| 857 | struct sk_buff *skb) |
| 858 | { |
| 859 | sock_recv_timestamp(msg, sk, skb); |
| 860 | sock_recv_drops(msg, sk, skb); |
| 861 | } |
| 862 | EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops); |
| 863 | |
| 864 | INDIRECT_CALLABLE_DECLARE(int inet_recvmsg(struct socket *, struct msghdr *, |
| 865 | size_t, int)); |
| 866 | INDIRECT_CALLABLE_DECLARE(int inet6_recvmsg(struct socket *, struct msghdr *, |
| 867 | size_t, int)); |
| 868 | static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg, |
| 869 | int flags) |
| 870 | { |
| 871 | return INDIRECT_CALL_INET(sock->ops->recvmsg, inet6_recvmsg, |
| 872 | inet_recvmsg, sock, msg, msg_data_left(msg), |
| 873 | flags); |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * sock_recvmsg - receive a message from @sock |
| 878 | * @sock: socket |
| 879 | * @msg: message to receive |
| 880 | * @flags: message flags |
| 881 | * |
| 882 | * Receives @msg from @sock, passing through LSM. Returns the total number |
| 883 | * of bytes received, or an error. |
| 884 | */ |
| 885 | int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags) |
| 886 | { |
| 887 | int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags); |
| 888 | |
| 889 | return err ?: sock_recvmsg_nosec(sock, msg, flags); |
| 890 | } |
| 891 | EXPORT_SYMBOL(sock_recvmsg); |
| 892 | |
| 893 | /** |
| 894 | * kernel_recvmsg - Receive a message from a socket (kernel space) |
| 895 | * @sock: The socket to receive the message from |
| 896 | * @msg: Received message |
| 897 | * @vec: Input s/g array for message data |
| 898 | * @num: Size of input s/g array |
| 899 | * @size: Number of bytes to read |
| 900 | * @flags: Message flags (MSG_DONTWAIT, etc...) |
| 901 | * |
| 902 | * On return the msg structure contains the scatter/gather array passed in the |
| 903 | * vec argument. The array is modified so that it consists of the unfilled |
| 904 | * portion of the original array. |
| 905 | * |
| 906 | * The returned value is the total number of bytes received, or an error. |
| 907 | */ |
| 908 | |
| 909 | int kernel_recvmsg(struct socket *sock, struct msghdr *msg, |
| 910 | struct kvec *vec, size_t num, size_t size, int flags) |
| 911 | { |
| 912 | mm_segment_t oldfs = get_fs(); |
| 913 | int result; |
| 914 | |
| 915 | iov_iter_kvec(&msg->msg_iter, READ, vec, num, size); |
| 916 | set_fs(KERNEL_DS); |
| 917 | result = sock_recvmsg(sock, msg, flags); |
| 918 | set_fs(oldfs); |
| 919 | return result; |
| 920 | } |
| 921 | EXPORT_SYMBOL(kernel_recvmsg); |
| 922 | |
| 923 | static ssize_t sock_sendpage(struct file *file, struct page *page, |
| 924 | int offset, size_t size, loff_t *ppos, int more) |
| 925 | { |
| 926 | struct socket *sock; |
| 927 | int flags; |
| 928 | |
| 929 | sock = file->private_data; |
| 930 | |
| 931 | flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0; |
| 932 | /* more is a combination of MSG_MORE and MSG_SENDPAGE_NOTLAST */ |
| 933 | flags |= more; |
| 934 | |
| 935 | return kernel_sendpage(sock, page, offset, size, flags); |
| 936 | } |
| 937 | |
| 938 | static ssize_t sock_splice_read(struct file *file, loff_t *ppos, |
| 939 | struct pipe_inode_info *pipe, size_t len, |
| 940 | unsigned int flags) |
| 941 | { |
| 942 | struct socket *sock = file->private_data; |
| 943 | |
| 944 | if (unlikely(!sock->ops->splice_read)) |
| 945 | return generic_file_splice_read(file, ppos, pipe, len, flags); |
| 946 | |
| 947 | return sock->ops->splice_read(sock, ppos, pipe, len, flags); |
| 948 | } |
| 949 | |
| 950 | static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to) |
| 951 | { |
| 952 | struct file *file = iocb->ki_filp; |
| 953 | struct socket *sock = file->private_data; |
| 954 | struct msghdr msg = {.msg_iter = *to, |
| 955 | .msg_iocb = iocb}; |
| 956 | ssize_t res; |
| 957 | |
| 958 | if (file->f_flags & O_NONBLOCK) |
| 959 | msg.msg_flags = MSG_DONTWAIT; |
| 960 | |
| 961 | if (iocb->ki_pos != 0) |
| 962 | return -ESPIPE; |
| 963 | |
| 964 | if (!iov_iter_count(to)) /* Match SYS5 behaviour */ |
| 965 | return 0; |
| 966 | |
| 967 | res = sock_recvmsg(sock, &msg, msg.msg_flags); |
| 968 | *to = msg.msg_iter; |
| 969 | return res; |
| 970 | } |
| 971 | |
| 972 | static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from) |
| 973 | { |
| 974 | struct file *file = iocb->ki_filp; |
| 975 | struct socket *sock = file->private_data; |
| 976 | struct msghdr msg = {.msg_iter = *from, |
| 977 | .msg_iocb = iocb}; |
| 978 | ssize_t res; |
| 979 | |
| 980 | if (iocb->ki_pos != 0) |
| 981 | return -ESPIPE; |
| 982 | |
| 983 | if (file->f_flags & O_NONBLOCK) |
| 984 | msg.msg_flags = MSG_DONTWAIT; |
| 985 | |
| 986 | if (sock->type == SOCK_SEQPACKET) |
| 987 | msg.msg_flags |= MSG_EOR; |
| 988 | |
| 989 | res = sock_sendmsg(sock, &msg); |
| 990 | *from = msg.msg_iter; |
| 991 | return res; |
| 992 | } |
| 993 | |
| 994 | /* |
| 995 | * Atomic setting of ioctl hooks to avoid race |
| 996 | * with module unload. |
| 997 | */ |
| 998 | |
| 999 | static DEFINE_MUTEX(br_ioctl_mutex); |
| 1000 | static int (*br_ioctl_hook) (struct net *, unsigned int cmd, void __user *arg); |
| 1001 | |
| 1002 | void brioctl_set(int (*hook) (struct net *, unsigned int, void __user *)) |
| 1003 | { |
| 1004 | mutex_lock(&br_ioctl_mutex); |
| 1005 | br_ioctl_hook = hook; |
| 1006 | mutex_unlock(&br_ioctl_mutex); |
| 1007 | } |
| 1008 | EXPORT_SYMBOL(brioctl_set); |
| 1009 | |
| 1010 | static DEFINE_MUTEX(vlan_ioctl_mutex); |
| 1011 | static int (*vlan_ioctl_hook) (struct net *, void __user *arg); |
| 1012 | |
| 1013 | void vlan_ioctl_set(int (*hook) (struct net *, void __user *)) |
| 1014 | { |
| 1015 | mutex_lock(&vlan_ioctl_mutex); |
| 1016 | vlan_ioctl_hook = hook; |
| 1017 | mutex_unlock(&vlan_ioctl_mutex); |
| 1018 | } |
| 1019 | EXPORT_SYMBOL(vlan_ioctl_set); |
| 1020 | |
| 1021 | static DEFINE_MUTEX(dlci_ioctl_mutex); |
| 1022 | static int (*dlci_ioctl_hook) (unsigned int, void __user *); |
| 1023 | |
| 1024 | void dlci_ioctl_set(int (*hook) (unsigned int, void __user *)) |
| 1025 | { |
| 1026 | mutex_lock(&dlci_ioctl_mutex); |
| 1027 | dlci_ioctl_hook = hook; |
| 1028 | mutex_unlock(&dlci_ioctl_mutex); |
| 1029 | } |
| 1030 | EXPORT_SYMBOL(dlci_ioctl_set); |
| 1031 | |
| 1032 | static long sock_do_ioctl(struct net *net, struct socket *sock, |
| 1033 | unsigned int cmd, unsigned long arg) |
| 1034 | { |
| 1035 | int err; |
| 1036 | void __user *argp = (void __user *)arg; |
| 1037 | |
| 1038 | err = sock->ops->ioctl(sock, cmd, arg); |
| 1039 | |
| 1040 | /* |
| 1041 | * If this ioctl is unknown try to hand it down |
| 1042 | * to the NIC driver. |
| 1043 | */ |
| 1044 | if (err != -ENOIOCTLCMD) |
| 1045 | return err; |
| 1046 | |
| 1047 | if (cmd == SIOCGIFCONF) { |
| 1048 | struct ifconf ifc; |
| 1049 | if (copy_from_user(&ifc, argp, sizeof(struct ifconf))) |
| 1050 | return -EFAULT; |
| 1051 | rtnl_lock(); |
| 1052 | err = dev_ifconf(net, &ifc, sizeof(struct ifreq)); |
| 1053 | rtnl_unlock(); |
| 1054 | if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf))) |
| 1055 | err = -EFAULT; |
| 1056 | } else { |
| 1057 | struct ifreq ifr; |
| 1058 | bool need_copyout; |
| 1059 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) |
| 1060 | return -EFAULT; |
| 1061 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); |
| 1062 | if (!err && need_copyout) |
| 1063 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) |
| 1064 | return -EFAULT; |
| 1065 | } |
| 1066 | return err; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * With an ioctl, arg may well be a user mode pointer, but we don't know |
| 1071 | * what to do with it - that's up to the protocol still. |
| 1072 | */ |
| 1073 | |
| 1074 | /** |
| 1075 | * get_net_ns - increment the refcount of the network namespace |
| 1076 | * @ns: common namespace (net) |
| 1077 | * |
| 1078 | * Returns the net's common namespace. |
| 1079 | */ |
| 1080 | |
| 1081 | struct ns_common *get_net_ns(struct ns_common *ns) |
| 1082 | { |
| 1083 | return &get_net(container_of(ns, struct net, ns))->ns; |
| 1084 | } |
| 1085 | EXPORT_SYMBOL_GPL(get_net_ns); |
| 1086 | |
| 1087 | static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
| 1088 | { |
| 1089 | struct socket *sock; |
| 1090 | struct sock *sk; |
| 1091 | void __user *argp = (void __user *)arg; |
| 1092 | int pid, err; |
| 1093 | struct net *net; |
| 1094 | |
| 1095 | sock = file->private_data; |
| 1096 | sk = sock->sk; |
| 1097 | net = sock_net(sk); |
| 1098 | if (unlikely(cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15))) { |
| 1099 | struct ifreq ifr; |
| 1100 | bool need_copyout; |
| 1101 | if (copy_from_user(&ifr, argp, sizeof(struct ifreq))) |
| 1102 | return -EFAULT; |
| 1103 | err = dev_ioctl(net, cmd, &ifr, &need_copyout); |
| 1104 | if (!err && need_copyout) |
| 1105 | if (copy_to_user(argp, &ifr, sizeof(struct ifreq))) |
| 1106 | return -EFAULT; |
| 1107 | } else |
| 1108 | #ifdef CONFIG_WEXT_CORE |
| 1109 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { |
| 1110 | err = wext_handle_ioctl(net, cmd, argp); |
| 1111 | } else |
| 1112 | #endif |
| 1113 | switch (cmd) { |
| 1114 | case FIOSETOWN: |
| 1115 | case SIOCSPGRP: |
| 1116 | err = -EFAULT; |
| 1117 | if (get_user(pid, (int __user *)argp)) |
| 1118 | break; |
| 1119 | err = f_setown(sock->file, pid, 1); |
| 1120 | break; |
| 1121 | case FIOGETOWN: |
| 1122 | case SIOCGPGRP: |
| 1123 | err = put_user(f_getown(sock->file), |
| 1124 | (int __user *)argp); |
| 1125 | break; |
| 1126 | case SIOCGIFBR: |
| 1127 | case SIOCSIFBR: |
| 1128 | case SIOCBRADDBR: |
| 1129 | case SIOCBRDELBR: |
| 1130 | err = -ENOPKG; |
| 1131 | if (!br_ioctl_hook) |
| 1132 | request_module("bridge"); |
| 1133 | |
| 1134 | mutex_lock(&br_ioctl_mutex); |
| 1135 | if (br_ioctl_hook) |
| 1136 | err = br_ioctl_hook(net, cmd, argp); |
| 1137 | mutex_unlock(&br_ioctl_mutex); |
| 1138 | break; |
| 1139 | case SIOCGIFVLAN: |
| 1140 | case SIOCSIFVLAN: |
| 1141 | err = -ENOPKG; |
| 1142 | if (!vlan_ioctl_hook) |
| 1143 | request_module("8021q"); |
| 1144 | |
| 1145 | mutex_lock(&vlan_ioctl_mutex); |
| 1146 | if (vlan_ioctl_hook) |
| 1147 | err = vlan_ioctl_hook(net, argp); |
| 1148 | mutex_unlock(&vlan_ioctl_mutex); |
| 1149 | break; |
| 1150 | case SIOCADDDLCI: |
| 1151 | case SIOCDELDLCI: |
| 1152 | err = -ENOPKG; |
| 1153 | if (!dlci_ioctl_hook) |
| 1154 | request_module("dlci"); |
| 1155 | |
| 1156 | mutex_lock(&dlci_ioctl_mutex); |
| 1157 | if (dlci_ioctl_hook) |
| 1158 | err = dlci_ioctl_hook(cmd, argp); |
| 1159 | mutex_unlock(&dlci_ioctl_mutex); |
| 1160 | break; |
| 1161 | case SIOCGSKNS: |
| 1162 | err = -EPERM; |
| 1163 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 1164 | break; |
| 1165 | |
| 1166 | err = open_related_ns(&net->ns, get_net_ns); |
| 1167 | break; |
| 1168 | case SIOCGSTAMP_OLD: |
| 1169 | case SIOCGSTAMPNS_OLD: |
| 1170 | if (!sock->ops->gettstamp) { |
| 1171 | err = -ENOIOCTLCMD; |
| 1172 | break; |
| 1173 | } |
| 1174 | err = sock->ops->gettstamp(sock, argp, |
| 1175 | cmd == SIOCGSTAMP_OLD, |
| 1176 | !IS_ENABLED(CONFIG_64BIT)); |
| 1177 | break; |
| 1178 | case SIOCGSTAMP_NEW: |
| 1179 | case SIOCGSTAMPNS_NEW: |
| 1180 | if (!sock->ops->gettstamp) { |
| 1181 | err = -ENOIOCTLCMD; |
| 1182 | break; |
| 1183 | } |
| 1184 | err = sock->ops->gettstamp(sock, argp, |
| 1185 | cmd == SIOCGSTAMP_NEW, |
| 1186 | false); |
| 1187 | break; |
| 1188 | default: |
| 1189 | err = sock_do_ioctl(net, sock, cmd, arg); |
| 1190 | break; |
| 1191 | } |
| 1192 | return err; |
| 1193 | } |
| 1194 | |
| 1195 | /** |
| 1196 | * sock_create_lite - creates a socket |
| 1197 | * @family: protocol family (AF_INET, ...) |
| 1198 | * @type: communication type (SOCK_STREAM, ...) |
| 1199 | * @protocol: protocol (0, ...) |
| 1200 | * @res: new socket |
| 1201 | * |
| 1202 | * Creates a new socket and assigns it to @res, passing through LSM. |
| 1203 | * The new socket initialization is not complete, see kernel_accept(). |
| 1204 | * Returns 0 or an error. On failure @res is set to %NULL. |
| 1205 | * This function internally uses GFP_KERNEL. |
| 1206 | */ |
| 1207 | |
| 1208 | int sock_create_lite(int family, int type, int protocol, struct socket **res) |
| 1209 | { |
| 1210 | int err; |
| 1211 | struct socket *sock = NULL; |
| 1212 | |
| 1213 | err = security_socket_create(family, type, protocol, 1); |
| 1214 | if (err) |
| 1215 | goto out; |
| 1216 | |
| 1217 | sock = sock_alloc(); |
| 1218 | if (!sock) { |
| 1219 | err = -ENOMEM; |
| 1220 | goto out; |
| 1221 | } |
| 1222 | |
| 1223 | sock->type = type; |
| 1224 | err = security_socket_post_create(sock, family, type, protocol, 1); |
| 1225 | if (err) |
| 1226 | goto out_release; |
| 1227 | |
| 1228 | out: |
| 1229 | *res = sock; |
| 1230 | return err; |
| 1231 | out_release: |
| 1232 | sock_release(sock); |
| 1233 | sock = NULL; |
| 1234 | goto out; |
| 1235 | } |
| 1236 | EXPORT_SYMBOL(sock_create_lite); |
| 1237 | |
| 1238 | /* No kernel lock held - perfect */ |
| 1239 | static __poll_t sock_poll(struct file *file, poll_table *wait) |
| 1240 | { |
| 1241 | struct socket *sock = file->private_data; |
| 1242 | __poll_t events = poll_requested_events(wait), flag = 0; |
| 1243 | |
| 1244 | if (!sock->ops->poll) |
| 1245 | return 0; |
| 1246 | |
| 1247 | if (sk_can_busy_loop(sock->sk)) { |
| 1248 | /* poll once if requested by the syscall */ |
| 1249 | if (events & POLL_BUSY_LOOP) |
| 1250 | sk_busy_loop(sock->sk, 1); |
| 1251 | |
| 1252 | /* if this socket can poll_ll, tell the system call */ |
| 1253 | flag = POLL_BUSY_LOOP; |
| 1254 | } |
| 1255 | |
| 1256 | return sock->ops->poll(file, sock, wait) | flag; |
| 1257 | } |
| 1258 | |
| 1259 | static int sock_mmap(struct file *file, struct vm_area_struct *vma) |
| 1260 | { |
| 1261 | struct socket *sock = file->private_data; |
| 1262 | |
| 1263 | return sock->ops->mmap(file, sock, vma); |
| 1264 | } |
| 1265 | |
| 1266 | static int sock_close(struct inode *inode, struct file *filp) |
| 1267 | { |
| 1268 | __sock_release(SOCKET_I(inode), inode); |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | /* |
| 1273 | * Update the socket async list |
| 1274 | * |
| 1275 | * Fasync_list locking strategy. |
| 1276 | * |
| 1277 | * 1. fasync_list is modified only under process context socket lock |
| 1278 | * i.e. under semaphore. |
| 1279 | * 2. fasync_list is used under read_lock(&sk->sk_callback_lock) |
| 1280 | * or under socket lock |
| 1281 | */ |
| 1282 | |
| 1283 | static int sock_fasync(int fd, struct file *filp, int on) |
| 1284 | { |
| 1285 | struct socket *sock = filp->private_data; |
| 1286 | struct sock *sk = sock->sk; |
| 1287 | struct socket_wq *wq = &sock->wq; |
| 1288 | |
| 1289 | if (sk == NULL) |
| 1290 | return -EINVAL; |
| 1291 | |
| 1292 | lock_sock(sk); |
| 1293 | fasync_helper(fd, filp, on, &wq->fasync_list); |
| 1294 | |
| 1295 | if (!wq->fasync_list) |
| 1296 | sock_reset_flag(sk, SOCK_FASYNC); |
| 1297 | else |
| 1298 | sock_set_flag(sk, SOCK_FASYNC); |
| 1299 | |
| 1300 | release_sock(sk); |
| 1301 | return 0; |
| 1302 | } |
| 1303 | |
| 1304 | /* This function may be called only under rcu_lock */ |
| 1305 | |
| 1306 | int sock_wake_async(struct socket_wq *wq, int how, int band) |
| 1307 | { |
| 1308 | if (!wq || !wq->fasync_list) |
| 1309 | return -1; |
| 1310 | |
| 1311 | switch (how) { |
| 1312 | case SOCK_WAKE_WAITD: |
| 1313 | if (test_bit(SOCKWQ_ASYNC_WAITDATA, &wq->flags)) |
| 1314 | break; |
| 1315 | goto call_kill; |
| 1316 | case SOCK_WAKE_SPACE: |
| 1317 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags)) |
| 1318 | break; |
| 1319 | /* fall through */ |
| 1320 | case SOCK_WAKE_IO: |
| 1321 | call_kill: |
| 1322 | kill_fasync(&wq->fasync_list, SIGIO, band); |
| 1323 | break; |
| 1324 | case SOCK_WAKE_URG: |
| 1325 | kill_fasync(&wq->fasync_list, SIGURG, band); |
| 1326 | } |
| 1327 | |
| 1328 | return 0; |
| 1329 | } |
| 1330 | EXPORT_SYMBOL(sock_wake_async); |
| 1331 | |
| 1332 | /** |
| 1333 | * __sock_create - creates a socket |
| 1334 | * @net: net namespace |
| 1335 | * @family: protocol family (AF_INET, ...) |
| 1336 | * @type: communication type (SOCK_STREAM, ...) |
| 1337 | * @protocol: protocol (0, ...) |
| 1338 | * @res: new socket |
| 1339 | * @kern: boolean for kernel space sockets |
| 1340 | * |
| 1341 | * Creates a new socket and assigns it to @res, passing through LSM. |
| 1342 | * Returns 0 or an error. On failure @res is set to %NULL. @kern must |
| 1343 | * be set to true if the socket resides in kernel space. |
| 1344 | * This function internally uses GFP_KERNEL. |
| 1345 | */ |
| 1346 | |
| 1347 | int __sock_create(struct net *net, int family, int type, int protocol, |
| 1348 | struct socket **res, int kern) |
| 1349 | { |
| 1350 | int err; |
| 1351 | struct socket *sock; |
| 1352 | const struct net_proto_family *pf; |
| 1353 | |
| 1354 | /* |
| 1355 | * Check protocol is in range |
| 1356 | */ |
| 1357 | if (family < 0 || family >= NPROTO) |
| 1358 | return -EAFNOSUPPORT; |
| 1359 | if (type < 0 || type >= SOCK_MAX) |
| 1360 | return -EINVAL; |
| 1361 | |
| 1362 | /* Compatibility. |
| 1363 | |
| 1364 | This uglymoron is moved from INET layer to here to avoid |
| 1365 | deadlock in module load. |
| 1366 | */ |
| 1367 | if (family == PF_INET && type == SOCK_PACKET) { |
| 1368 | pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n", |
| 1369 | current->comm); |
| 1370 | family = PF_PACKET; |
| 1371 | } |
| 1372 | |
| 1373 | err = security_socket_create(family, type, protocol, kern); |
| 1374 | if (err) |
| 1375 | return err; |
| 1376 | |
| 1377 | /* |
| 1378 | * Allocate the socket and allow the family to set things up. if |
| 1379 | * the protocol is 0, the family is instructed to select an appropriate |
| 1380 | * default. |
| 1381 | */ |
| 1382 | sock = sock_alloc(); |
| 1383 | if (!sock) { |
| 1384 | net_warn_ratelimited("socket: no more sockets\n"); |
| 1385 | return -ENFILE; /* Not exactly a match, but its the |
| 1386 | closest posix thing */ |
| 1387 | } |
| 1388 | |
| 1389 | sock->type = type; |
| 1390 | |
| 1391 | #ifdef CONFIG_MODULES |
| 1392 | /* Attempt to load a protocol module if the find failed. |
| 1393 | * |
| 1394 | * 12/09/1996 Marcin: But! this makes REALLY only sense, if the user |
| 1395 | * requested real, full-featured networking support upon configuration. |
| 1396 | * Otherwise module support will break! |
| 1397 | */ |
| 1398 | if (rcu_access_pointer(net_families[family]) == NULL) |
| 1399 | request_module("net-pf-%d", family); |
| 1400 | #endif |
| 1401 | |
| 1402 | rcu_read_lock(); |
| 1403 | pf = rcu_dereference(net_families[family]); |
| 1404 | err = -EAFNOSUPPORT; |
| 1405 | if (!pf) |
| 1406 | goto out_release; |
| 1407 | |
| 1408 | /* |
| 1409 | * We will call the ->create function, that possibly is in a loadable |
| 1410 | * module, so we have to bump that loadable module refcnt first. |
| 1411 | */ |
| 1412 | if (!try_module_get(pf->owner)) |
| 1413 | goto out_release; |
| 1414 | |
| 1415 | /* Now protected by module ref count */ |
| 1416 | rcu_read_unlock(); |
| 1417 | |
| 1418 | err = pf->create(net, sock, protocol, kern); |
| 1419 | if (err < 0) |
| 1420 | goto out_module_put; |
| 1421 | |
| 1422 | /* |
| 1423 | * Now to bump the refcnt of the [loadable] module that owns this |
| 1424 | * socket at sock_release time we decrement its refcnt. |
| 1425 | */ |
| 1426 | if (!try_module_get(sock->ops->owner)) |
| 1427 | goto out_module_busy; |
| 1428 | |
| 1429 | /* |
| 1430 | * Now that we're done with the ->create function, the [loadable] |
| 1431 | * module can have its refcnt decremented |
| 1432 | */ |
| 1433 | module_put(pf->owner); |
| 1434 | err = security_socket_post_create(sock, family, type, protocol, kern); |
| 1435 | if (err) |
| 1436 | goto out_sock_release; |
| 1437 | *res = sock; |
| 1438 | |
| 1439 | return 0; |
| 1440 | |
| 1441 | out_module_busy: |
| 1442 | err = -EAFNOSUPPORT; |
| 1443 | out_module_put: |
| 1444 | sock->ops = NULL; |
| 1445 | module_put(pf->owner); |
| 1446 | out_sock_release: |
| 1447 | sock_release(sock); |
| 1448 | return err; |
| 1449 | |
| 1450 | out_release: |
| 1451 | rcu_read_unlock(); |
| 1452 | goto out_sock_release; |
| 1453 | } |
| 1454 | EXPORT_SYMBOL(__sock_create); |
| 1455 | |
| 1456 | /** |
| 1457 | * sock_create - creates a socket |
| 1458 | * @family: protocol family (AF_INET, ...) |
| 1459 | * @type: communication type (SOCK_STREAM, ...) |
| 1460 | * @protocol: protocol (0, ...) |
| 1461 | * @res: new socket |
| 1462 | * |
| 1463 | * A wrapper around __sock_create(). |
| 1464 | * Returns 0 or an error. This function internally uses GFP_KERNEL. |
| 1465 | */ |
| 1466 | |
| 1467 | int sock_create(int family, int type, int protocol, struct socket **res) |
| 1468 | { |
| 1469 | return __sock_create(current->nsproxy->net_ns, family, type, protocol, res, 0); |
| 1470 | } |
| 1471 | EXPORT_SYMBOL(sock_create); |
| 1472 | |
| 1473 | /** |
| 1474 | * sock_create_kern - creates a socket (kernel space) |
| 1475 | * @net: net namespace |
| 1476 | * @family: protocol family (AF_INET, ...) |
| 1477 | * @type: communication type (SOCK_STREAM, ...) |
| 1478 | * @protocol: protocol (0, ...) |
| 1479 | * @res: new socket |
| 1480 | * |
| 1481 | * A wrapper around __sock_create(). |
| 1482 | * Returns 0 or an error. This function internally uses GFP_KERNEL. |
| 1483 | */ |
| 1484 | |
| 1485 | int sock_create_kern(struct net *net, int family, int type, int protocol, struct socket **res) |
| 1486 | { |
| 1487 | return __sock_create(net, family, type, protocol, res, 1); |
| 1488 | } |
| 1489 | EXPORT_SYMBOL(sock_create_kern); |
| 1490 | |
| 1491 | int __sys_socket(int family, int type, int protocol) |
| 1492 | { |
| 1493 | int retval; |
| 1494 | struct socket *sock; |
| 1495 | int flags; |
| 1496 | |
| 1497 | /* Check the SOCK_* constants for consistency. */ |
| 1498 | BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC); |
| 1499 | BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK); |
| 1500 | BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK); |
| 1501 | BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK); |
| 1502 | |
| 1503 | flags = type & ~SOCK_TYPE_MASK; |
| 1504 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 1505 | return -EINVAL; |
| 1506 | type &= SOCK_TYPE_MASK; |
| 1507 | |
| 1508 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
| 1509 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
| 1510 | |
| 1511 | retval = sock_create(family, type, protocol, &sock); |
| 1512 | if (retval < 0) |
| 1513 | return retval; |
| 1514 | |
| 1515 | return sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK)); |
| 1516 | } |
| 1517 | |
| 1518 | SYSCALL_DEFINE3(socket, int, family, int, type, int, protocol) |
| 1519 | { |
| 1520 | return __sys_socket(family, type, protocol); |
| 1521 | } |
| 1522 | |
| 1523 | /* |
| 1524 | * Create a pair of connected sockets. |
| 1525 | */ |
| 1526 | |
| 1527 | int __sys_socketpair(int family, int type, int protocol, int __user *usockvec) |
| 1528 | { |
| 1529 | struct socket *sock1, *sock2; |
| 1530 | int fd1, fd2, err; |
| 1531 | struct file *newfile1, *newfile2; |
| 1532 | int flags; |
| 1533 | |
| 1534 | flags = type & ~SOCK_TYPE_MASK; |
| 1535 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 1536 | return -EINVAL; |
| 1537 | type &= SOCK_TYPE_MASK; |
| 1538 | |
| 1539 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
| 1540 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
| 1541 | |
| 1542 | /* |
| 1543 | * reserve descriptors and make sure we won't fail |
| 1544 | * to return them to userland. |
| 1545 | */ |
| 1546 | fd1 = get_unused_fd_flags(flags); |
| 1547 | if (unlikely(fd1 < 0)) |
| 1548 | return fd1; |
| 1549 | |
| 1550 | fd2 = get_unused_fd_flags(flags); |
| 1551 | if (unlikely(fd2 < 0)) { |
| 1552 | put_unused_fd(fd1); |
| 1553 | return fd2; |
| 1554 | } |
| 1555 | |
| 1556 | err = put_user(fd1, &usockvec[0]); |
| 1557 | if (err) |
| 1558 | goto out; |
| 1559 | |
| 1560 | err = put_user(fd2, &usockvec[1]); |
| 1561 | if (err) |
| 1562 | goto out; |
| 1563 | |
| 1564 | /* |
| 1565 | * Obtain the first socket and check if the underlying protocol |
| 1566 | * supports the socketpair call. |
| 1567 | */ |
| 1568 | |
| 1569 | err = sock_create(family, type, protocol, &sock1); |
| 1570 | if (unlikely(err < 0)) |
| 1571 | goto out; |
| 1572 | |
| 1573 | err = sock_create(family, type, protocol, &sock2); |
| 1574 | if (unlikely(err < 0)) { |
| 1575 | sock_release(sock1); |
| 1576 | goto out; |
| 1577 | } |
| 1578 | |
| 1579 | err = security_socket_socketpair(sock1, sock2); |
| 1580 | if (unlikely(err)) { |
| 1581 | sock_release(sock2); |
| 1582 | sock_release(sock1); |
| 1583 | goto out; |
| 1584 | } |
| 1585 | |
| 1586 | err = sock1->ops->socketpair(sock1, sock2); |
| 1587 | if (unlikely(err < 0)) { |
| 1588 | sock_release(sock2); |
| 1589 | sock_release(sock1); |
| 1590 | goto out; |
| 1591 | } |
| 1592 | |
| 1593 | newfile1 = sock_alloc_file(sock1, flags, NULL); |
| 1594 | if (IS_ERR(newfile1)) { |
| 1595 | err = PTR_ERR(newfile1); |
| 1596 | sock_release(sock2); |
| 1597 | goto out; |
| 1598 | } |
| 1599 | |
| 1600 | newfile2 = sock_alloc_file(sock2, flags, NULL); |
| 1601 | if (IS_ERR(newfile2)) { |
| 1602 | err = PTR_ERR(newfile2); |
| 1603 | fput(newfile1); |
| 1604 | goto out; |
| 1605 | } |
| 1606 | |
| 1607 | audit_fd_pair(fd1, fd2); |
| 1608 | |
| 1609 | fd_install(fd1, newfile1); |
| 1610 | fd_install(fd2, newfile2); |
| 1611 | return 0; |
| 1612 | |
| 1613 | out: |
| 1614 | put_unused_fd(fd2); |
| 1615 | put_unused_fd(fd1); |
| 1616 | return err; |
| 1617 | } |
| 1618 | |
| 1619 | SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol, |
| 1620 | int __user *, usockvec) |
| 1621 | { |
| 1622 | return __sys_socketpair(family, type, protocol, usockvec); |
| 1623 | } |
| 1624 | |
| 1625 | /* |
| 1626 | * Bind a name to a socket. Nothing much to do here since it's |
| 1627 | * the protocol's responsibility to handle the local address. |
| 1628 | * |
| 1629 | * We move the socket address to kernel space before we call |
| 1630 | * the protocol layer (having also checked the address is ok). |
| 1631 | */ |
| 1632 | |
| 1633 | int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen) |
| 1634 | { |
| 1635 | struct socket *sock; |
| 1636 | struct sockaddr_storage address; |
| 1637 | int err, fput_needed; |
| 1638 | |
| 1639 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1640 | if (sock) { |
| 1641 | err = move_addr_to_kernel(umyaddr, addrlen, &address); |
| 1642 | if (!err) { |
| 1643 | err = security_socket_bind(sock, |
| 1644 | (struct sockaddr *)&address, |
| 1645 | addrlen); |
| 1646 | if (!err) |
| 1647 | err = sock->ops->bind(sock, |
| 1648 | (struct sockaddr *) |
| 1649 | &address, addrlen); |
| 1650 | } |
| 1651 | fput_light(sock->file, fput_needed); |
| 1652 | } |
| 1653 | return err; |
| 1654 | } |
| 1655 | |
| 1656 | SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen) |
| 1657 | { |
| 1658 | return __sys_bind(fd, umyaddr, addrlen); |
| 1659 | } |
| 1660 | |
| 1661 | /* |
| 1662 | * Perform a listen. Basically, we allow the protocol to do anything |
| 1663 | * necessary for a listen, and if that works, we mark the socket as |
| 1664 | * ready for listening. |
| 1665 | */ |
| 1666 | |
| 1667 | int __sys_listen(int fd, int backlog) |
| 1668 | { |
| 1669 | struct socket *sock; |
| 1670 | int err, fput_needed; |
| 1671 | int somaxconn; |
| 1672 | |
| 1673 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1674 | if (sock) { |
| 1675 | somaxconn = sock_net(sock->sk)->core.sysctl_somaxconn; |
| 1676 | if ((unsigned int)backlog > somaxconn) |
| 1677 | backlog = somaxconn; |
| 1678 | |
| 1679 | err = security_socket_listen(sock, backlog); |
| 1680 | if (!err) |
| 1681 | err = sock->ops->listen(sock, backlog); |
| 1682 | |
| 1683 | fput_light(sock->file, fput_needed); |
| 1684 | } |
| 1685 | return err; |
| 1686 | } |
| 1687 | |
| 1688 | SYSCALL_DEFINE2(listen, int, fd, int, backlog) |
| 1689 | { |
| 1690 | return __sys_listen(fd, backlog); |
| 1691 | } |
| 1692 | |
| 1693 | /* |
| 1694 | * For accept, we attempt to create a new socket, set up the link |
| 1695 | * with the client, wake up the client, then return the new |
| 1696 | * connected fd. We collect the address of the connector in kernel |
| 1697 | * space and move it to user at the very end. This is unclean because |
| 1698 | * we open the socket then return an error. |
| 1699 | * |
| 1700 | * 1003.1g adds the ability to recvmsg() to query connection pending |
| 1701 | * status to recvmsg. We need to add that support in a way thats |
| 1702 | * clean when we restructure accept also. |
| 1703 | */ |
| 1704 | |
| 1705 | int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr, |
| 1706 | int __user *upeer_addrlen, int flags) |
| 1707 | { |
| 1708 | struct socket *sock, *newsock; |
| 1709 | struct file *newfile; |
| 1710 | int err, len, newfd, fput_needed; |
| 1711 | struct sockaddr_storage address; |
| 1712 | |
| 1713 | if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 1714 | return -EINVAL; |
| 1715 | |
| 1716 | if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK)) |
| 1717 | flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
| 1718 | |
| 1719 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1720 | if (!sock) |
| 1721 | goto out; |
| 1722 | |
| 1723 | err = -ENFILE; |
| 1724 | newsock = sock_alloc(); |
| 1725 | if (!newsock) |
| 1726 | goto out_put; |
| 1727 | |
| 1728 | newsock->type = sock->type; |
| 1729 | newsock->ops = sock->ops; |
| 1730 | |
| 1731 | /* |
| 1732 | * We don't need try_module_get here, as the listening socket (sock) |
| 1733 | * has the protocol module (sock->ops->owner) held. |
| 1734 | */ |
| 1735 | __module_get(newsock->ops->owner); |
| 1736 | |
| 1737 | newfd = get_unused_fd_flags(flags); |
| 1738 | if (unlikely(newfd < 0)) { |
| 1739 | err = newfd; |
| 1740 | sock_release(newsock); |
| 1741 | goto out_put; |
| 1742 | } |
| 1743 | newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name); |
| 1744 | if (IS_ERR(newfile)) { |
| 1745 | err = PTR_ERR(newfile); |
| 1746 | put_unused_fd(newfd); |
| 1747 | goto out_put; |
| 1748 | } |
| 1749 | |
| 1750 | err = security_socket_accept(sock, newsock); |
| 1751 | if (err) |
| 1752 | goto out_fd; |
| 1753 | |
| 1754 | err = sock->ops->accept(sock, newsock, sock->file->f_flags, false); |
| 1755 | if (err < 0) |
| 1756 | goto out_fd; |
| 1757 | |
| 1758 | if (upeer_sockaddr) { |
| 1759 | len = newsock->ops->getname(newsock, |
| 1760 | (struct sockaddr *)&address, 2); |
| 1761 | if (len < 0) { |
| 1762 | err = -ECONNABORTED; |
| 1763 | goto out_fd; |
| 1764 | } |
| 1765 | err = move_addr_to_user(&address, |
| 1766 | len, upeer_sockaddr, upeer_addrlen); |
| 1767 | if (err < 0) |
| 1768 | goto out_fd; |
| 1769 | } |
| 1770 | |
| 1771 | /* File flags are not inherited via accept() unlike another OSes. */ |
| 1772 | |
| 1773 | fd_install(newfd, newfile); |
| 1774 | err = newfd; |
| 1775 | |
| 1776 | out_put: |
| 1777 | fput_light(sock->file, fput_needed); |
| 1778 | out: |
| 1779 | return err; |
| 1780 | out_fd: |
| 1781 | fput(newfile); |
| 1782 | put_unused_fd(newfd); |
| 1783 | goto out_put; |
| 1784 | } |
| 1785 | |
| 1786 | SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr, |
| 1787 | int __user *, upeer_addrlen, int, flags) |
| 1788 | { |
| 1789 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, flags); |
| 1790 | } |
| 1791 | |
| 1792 | SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr, |
| 1793 | int __user *, upeer_addrlen) |
| 1794 | { |
| 1795 | return __sys_accept4(fd, upeer_sockaddr, upeer_addrlen, 0); |
| 1796 | } |
| 1797 | |
| 1798 | /* |
| 1799 | * Attempt to connect to a socket with the server address. The address |
| 1800 | * is in user space so we verify it is OK and move it to kernel space. |
| 1801 | * |
| 1802 | * For 1003.1g we need to add clean support for a bind to AF_UNSPEC to |
| 1803 | * break bindings |
| 1804 | * |
| 1805 | * NOTE: 1003.1g draft 6.3 is broken with respect to AX.25/NetROM and |
| 1806 | * other SEQPACKET protocols that take time to connect() as it doesn't |
| 1807 | * include the -EINPROGRESS status for such sockets. |
| 1808 | */ |
| 1809 | |
| 1810 | int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen) |
| 1811 | { |
| 1812 | struct socket *sock; |
| 1813 | struct sockaddr_storage address; |
| 1814 | int err, fput_needed; |
| 1815 | |
| 1816 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1817 | if (!sock) |
| 1818 | goto out; |
| 1819 | err = move_addr_to_kernel(uservaddr, addrlen, &address); |
| 1820 | if (err < 0) |
| 1821 | goto out_put; |
| 1822 | |
| 1823 | err = |
| 1824 | security_socket_connect(sock, (struct sockaddr *)&address, addrlen); |
| 1825 | if (err) |
| 1826 | goto out_put; |
| 1827 | |
| 1828 | err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen, |
| 1829 | sock->file->f_flags); |
| 1830 | out_put: |
| 1831 | fput_light(sock->file, fput_needed); |
| 1832 | out: |
| 1833 | return err; |
| 1834 | } |
| 1835 | |
| 1836 | SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr, |
| 1837 | int, addrlen) |
| 1838 | { |
| 1839 | return __sys_connect(fd, uservaddr, addrlen); |
| 1840 | } |
| 1841 | |
| 1842 | /* |
| 1843 | * Get the local address ('name') of a socket object. Move the obtained |
| 1844 | * name to user space. |
| 1845 | */ |
| 1846 | |
| 1847 | int __sys_getsockname(int fd, struct sockaddr __user *usockaddr, |
| 1848 | int __user *usockaddr_len) |
| 1849 | { |
| 1850 | struct socket *sock; |
| 1851 | struct sockaddr_storage address; |
| 1852 | int err, fput_needed; |
| 1853 | |
| 1854 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1855 | if (!sock) |
| 1856 | goto out; |
| 1857 | |
| 1858 | err = security_socket_getsockname(sock); |
| 1859 | if (err) |
| 1860 | goto out_put; |
| 1861 | |
| 1862 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 0); |
| 1863 | if (err < 0) |
| 1864 | goto out_put; |
| 1865 | /* "err" is actually length in this case */ |
| 1866 | err = move_addr_to_user(&address, err, usockaddr, usockaddr_len); |
| 1867 | |
| 1868 | out_put: |
| 1869 | fput_light(sock->file, fput_needed); |
| 1870 | out: |
| 1871 | return err; |
| 1872 | } |
| 1873 | |
| 1874 | SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr, |
| 1875 | int __user *, usockaddr_len) |
| 1876 | { |
| 1877 | return __sys_getsockname(fd, usockaddr, usockaddr_len); |
| 1878 | } |
| 1879 | |
| 1880 | /* |
| 1881 | * Get the remote address ('name') of a socket object. Move the obtained |
| 1882 | * name to user space. |
| 1883 | */ |
| 1884 | |
| 1885 | int __sys_getpeername(int fd, struct sockaddr __user *usockaddr, |
| 1886 | int __user *usockaddr_len) |
| 1887 | { |
| 1888 | struct socket *sock; |
| 1889 | struct sockaddr_storage address; |
| 1890 | int err, fput_needed; |
| 1891 | |
| 1892 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1893 | if (sock != NULL) { |
| 1894 | err = security_socket_getpeername(sock); |
| 1895 | if (err) { |
| 1896 | fput_light(sock->file, fput_needed); |
| 1897 | return err; |
| 1898 | } |
| 1899 | |
| 1900 | err = sock->ops->getname(sock, (struct sockaddr *)&address, 1); |
| 1901 | if (err >= 0) |
| 1902 | /* "err" is actually length in this case */ |
| 1903 | err = move_addr_to_user(&address, err, usockaddr, |
| 1904 | usockaddr_len); |
| 1905 | fput_light(sock->file, fput_needed); |
| 1906 | } |
| 1907 | return err; |
| 1908 | } |
| 1909 | |
| 1910 | SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr, |
| 1911 | int __user *, usockaddr_len) |
| 1912 | { |
| 1913 | return __sys_getpeername(fd, usockaddr, usockaddr_len); |
| 1914 | } |
| 1915 | |
| 1916 | /* |
| 1917 | * Send a datagram to a given address. We move the address into kernel |
| 1918 | * space and check the user space data area is readable before invoking |
| 1919 | * the protocol. |
| 1920 | */ |
| 1921 | int __sys_sendto(int fd, void __user *buff, size_t len, unsigned int flags, |
| 1922 | struct sockaddr __user *addr, int addr_len) |
| 1923 | { |
| 1924 | struct socket *sock; |
| 1925 | struct sockaddr_storage address; |
| 1926 | int err; |
| 1927 | struct msghdr msg; |
| 1928 | struct iovec iov; |
| 1929 | int fput_needed; |
| 1930 | |
| 1931 | err = import_single_range(WRITE, buff, len, &iov, &msg.msg_iter); |
| 1932 | if (unlikely(err)) |
| 1933 | return err; |
| 1934 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1935 | if (!sock) |
| 1936 | goto out; |
| 1937 | |
| 1938 | msg.msg_name = NULL; |
| 1939 | msg.msg_control = NULL; |
| 1940 | msg.msg_controllen = 0; |
| 1941 | msg.msg_namelen = 0; |
| 1942 | if (addr) { |
| 1943 | err = move_addr_to_kernel(addr, addr_len, &address); |
| 1944 | if (err < 0) |
| 1945 | goto out_put; |
| 1946 | msg.msg_name = (struct sockaddr *)&address; |
| 1947 | msg.msg_namelen = addr_len; |
| 1948 | } |
| 1949 | if (sock->file->f_flags & O_NONBLOCK) |
| 1950 | flags |= MSG_DONTWAIT; |
| 1951 | msg.msg_flags = flags; |
| 1952 | err = sock_sendmsg(sock, &msg); |
| 1953 | |
| 1954 | out_put: |
| 1955 | fput_light(sock->file, fput_needed); |
| 1956 | out: |
| 1957 | return err; |
| 1958 | } |
| 1959 | |
| 1960 | SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len, |
| 1961 | unsigned int, flags, struct sockaddr __user *, addr, |
| 1962 | int, addr_len) |
| 1963 | { |
| 1964 | return __sys_sendto(fd, buff, len, flags, addr, addr_len); |
| 1965 | } |
| 1966 | |
| 1967 | /* |
| 1968 | * Send a datagram down a socket. |
| 1969 | */ |
| 1970 | |
| 1971 | SYSCALL_DEFINE4(send, int, fd, void __user *, buff, size_t, len, |
| 1972 | unsigned int, flags) |
| 1973 | { |
| 1974 | return __sys_sendto(fd, buff, len, flags, NULL, 0); |
| 1975 | } |
| 1976 | |
| 1977 | /* |
| 1978 | * Receive a frame from the socket and optionally record the address of the |
| 1979 | * sender. We verify the buffers are writable and if needed move the |
| 1980 | * sender address from kernel to user space. |
| 1981 | */ |
| 1982 | int __sys_recvfrom(int fd, void __user *ubuf, size_t size, unsigned int flags, |
| 1983 | struct sockaddr __user *addr, int __user *addr_len) |
| 1984 | { |
| 1985 | struct socket *sock; |
| 1986 | struct iovec iov; |
| 1987 | struct msghdr msg; |
| 1988 | struct sockaddr_storage address; |
| 1989 | int err, err2; |
| 1990 | int fput_needed; |
| 1991 | |
| 1992 | err = import_single_range(READ, ubuf, size, &iov, &msg.msg_iter); |
| 1993 | if (unlikely(err)) |
| 1994 | return err; |
| 1995 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 1996 | if (!sock) |
| 1997 | goto out; |
| 1998 | |
| 1999 | msg.msg_control = NULL; |
| 2000 | msg.msg_controllen = 0; |
| 2001 | /* Save some cycles and don't copy the address if not needed */ |
| 2002 | msg.msg_name = addr ? (struct sockaddr *)&address : NULL; |
| 2003 | /* We assume all kernel code knows the size of sockaddr_storage */ |
| 2004 | msg.msg_namelen = 0; |
| 2005 | msg.msg_iocb = NULL; |
| 2006 | msg.msg_flags = 0; |
| 2007 | if (sock->file->f_flags & O_NONBLOCK) |
| 2008 | flags |= MSG_DONTWAIT; |
| 2009 | err = sock_recvmsg(sock, &msg, flags); |
| 2010 | |
| 2011 | if (err >= 0 && addr != NULL) { |
| 2012 | err2 = move_addr_to_user(&address, |
| 2013 | msg.msg_namelen, addr, addr_len); |
| 2014 | if (err2 < 0) |
| 2015 | err = err2; |
| 2016 | } |
| 2017 | |
| 2018 | fput_light(sock->file, fput_needed); |
| 2019 | out: |
| 2020 | return err; |
| 2021 | } |
| 2022 | |
| 2023 | SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, |
| 2024 | unsigned int, flags, struct sockaddr __user *, addr, |
| 2025 | int __user *, addr_len) |
| 2026 | { |
| 2027 | return __sys_recvfrom(fd, ubuf, size, flags, addr, addr_len); |
| 2028 | } |
| 2029 | |
| 2030 | /* |
| 2031 | * Receive a datagram from a socket. |
| 2032 | */ |
| 2033 | |
| 2034 | SYSCALL_DEFINE4(recv, int, fd, void __user *, ubuf, size_t, size, |
| 2035 | unsigned int, flags) |
| 2036 | { |
| 2037 | return __sys_recvfrom(fd, ubuf, size, flags, NULL, NULL); |
| 2038 | } |
| 2039 | |
| 2040 | /* |
| 2041 | * Set a socket option. Because we don't know the option lengths we have |
| 2042 | * to pass the user mode parameter for the protocols to sort out. |
| 2043 | */ |
| 2044 | |
| 2045 | static int __sys_setsockopt(int fd, int level, int optname, |
| 2046 | char __user *optval, int optlen) |
| 2047 | { |
| 2048 | mm_segment_t oldfs = get_fs(); |
| 2049 | char *kernel_optval = NULL; |
| 2050 | int err, fput_needed; |
| 2051 | struct socket *sock; |
| 2052 | |
| 2053 | if (optlen < 0) |
| 2054 | return -EINVAL; |
| 2055 | |
| 2056 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2057 | if (sock != NULL) { |
| 2058 | err = security_socket_setsockopt(sock, level, optname); |
| 2059 | if (err) |
| 2060 | goto out_put; |
| 2061 | |
| 2062 | err = BPF_CGROUP_RUN_PROG_SETSOCKOPT(sock->sk, &level, |
| 2063 | &optname, optval, &optlen, |
| 2064 | &kernel_optval); |
| 2065 | |
| 2066 | if (err < 0) { |
| 2067 | goto out_put; |
| 2068 | } else if (err > 0) { |
| 2069 | err = 0; |
| 2070 | goto out_put; |
| 2071 | } |
| 2072 | |
| 2073 | if (kernel_optval) { |
| 2074 | set_fs(KERNEL_DS); |
| 2075 | optval = (char __user __force *)kernel_optval; |
| 2076 | } |
| 2077 | |
| 2078 | if (level == SOL_SOCKET) |
| 2079 | err = |
| 2080 | sock_setsockopt(sock, level, optname, optval, |
| 2081 | optlen); |
| 2082 | else |
| 2083 | err = |
| 2084 | sock->ops->setsockopt(sock, level, optname, optval, |
| 2085 | optlen); |
| 2086 | |
| 2087 | if (kernel_optval) { |
| 2088 | set_fs(oldfs); |
| 2089 | kfree(kernel_optval); |
| 2090 | } |
| 2091 | out_put: |
| 2092 | fput_light(sock->file, fput_needed); |
| 2093 | } |
| 2094 | return err; |
| 2095 | } |
| 2096 | |
| 2097 | SYSCALL_DEFINE5(setsockopt, int, fd, int, level, int, optname, |
| 2098 | char __user *, optval, int, optlen) |
| 2099 | { |
| 2100 | return __sys_setsockopt(fd, level, optname, optval, optlen); |
| 2101 | } |
| 2102 | |
| 2103 | /* |
| 2104 | * Get a socket option. Because we don't know the option lengths we have |
| 2105 | * to pass a user mode parameter for the protocols to sort out. |
| 2106 | */ |
| 2107 | |
| 2108 | static int __sys_getsockopt(int fd, int level, int optname, |
| 2109 | char __user *optval, int __user *optlen) |
| 2110 | { |
| 2111 | int err, fput_needed; |
| 2112 | struct socket *sock; |
| 2113 | int max_optlen; |
| 2114 | |
| 2115 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2116 | if (sock != NULL) { |
| 2117 | err = security_socket_getsockopt(sock, level, optname); |
| 2118 | if (err) |
| 2119 | goto out_put; |
| 2120 | |
| 2121 | max_optlen = BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN(optlen); |
| 2122 | |
| 2123 | if (level == SOL_SOCKET) |
| 2124 | err = |
| 2125 | sock_getsockopt(sock, level, optname, optval, |
| 2126 | optlen); |
| 2127 | else |
| 2128 | err = |
| 2129 | sock->ops->getsockopt(sock, level, optname, optval, |
| 2130 | optlen); |
| 2131 | |
| 2132 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT(sock->sk, level, optname, |
| 2133 | optval, optlen, |
| 2134 | max_optlen, err); |
| 2135 | out_put: |
| 2136 | fput_light(sock->file, fput_needed); |
| 2137 | } |
| 2138 | return err; |
| 2139 | } |
| 2140 | |
| 2141 | SYSCALL_DEFINE5(getsockopt, int, fd, int, level, int, optname, |
| 2142 | char __user *, optval, int __user *, optlen) |
| 2143 | { |
| 2144 | return __sys_getsockopt(fd, level, optname, optval, optlen); |
| 2145 | } |
| 2146 | |
| 2147 | /* |
| 2148 | * Shutdown a socket. |
| 2149 | */ |
| 2150 | |
| 2151 | int __sys_shutdown(int fd, int how) |
| 2152 | { |
| 2153 | int err, fput_needed; |
| 2154 | struct socket *sock; |
| 2155 | |
| 2156 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2157 | if (sock != NULL) { |
| 2158 | err = security_socket_shutdown(sock, how); |
| 2159 | if (!err) |
| 2160 | err = sock->ops->shutdown(sock, how); |
| 2161 | fput_light(sock->file, fput_needed); |
| 2162 | } |
| 2163 | return err; |
| 2164 | } |
| 2165 | |
| 2166 | SYSCALL_DEFINE2(shutdown, int, fd, int, how) |
| 2167 | { |
| 2168 | return __sys_shutdown(fd, how); |
| 2169 | } |
| 2170 | |
| 2171 | /* A couple of helpful macros for getting the address of the 32/64 bit |
| 2172 | * fields which are the same type (int / unsigned) on our platforms. |
| 2173 | */ |
| 2174 | #define COMPAT_MSG(msg, member) ((MSG_CMSG_COMPAT & flags) ? &msg##_compat->member : &msg->member) |
| 2175 | #define COMPAT_NAMELEN(msg) COMPAT_MSG(msg, msg_namelen) |
| 2176 | #define COMPAT_FLAGS(msg) COMPAT_MSG(msg, msg_flags) |
| 2177 | |
| 2178 | struct used_address { |
| 2179 | struct sockaddr_storage name; |
| 2180 | unsigned int name_len; |
| 2181 | }; |
| 2182 | |
| 2183 | static int copy_msghdr_from_user(struct msghdr *kmsg, |
| 2184 | struct user_msghdr __user *umsg, |
| 2185 | struct sockaddr __user **save_addr, |
| 2186 | struct iovec **iov) |
| 2187 | { |
| 2188 | struct user_msghdr msg; |
| 2189 | ssize_t err; |
| 2190 | |
| 2191 | if (copy_from_user(&msg, umsg, sizeof(*umsg))) |
| 2192 | return -EFAULT; |
| 2193 | |
| 2194 | kmsg->msg_control = (void __force *)msg.msg_control; |
| 2195 | kmsg->msg_controllen = msg.msg_controllen; |
| 2196 | kmsg->msg_flags = msg.msg_flags; |
| 2197 | |
| 2198 | kmsg->msg_namelen = msg.msg_namelen; |
| 2199 | if (!msg.msg_name) |
| 2200 | kmsg->msg_namelen = 0; |
| 2201 | |
| 2202 | if (kmsg->msg_namelen < 0) |
| 2203 | return -EINVAL; |
| 2204 | |
| 2205 | if (kmsg->msg_namelen > sizeof(struct sockaddr_storage)) |
| 2206 | kmsg->msg_namelen = sizeof(struct sockaddr_storage); |
| 2207 | |
| 2208 | if (save_addr) |
| 2209 | *save_addr = msg.msg_name; |
| 2210 | |
| 2211 | if (msg.msg_name && kmsg->msg_namelen) { |
| 2212 | if (!save_addr) { |
| 2213 | err = move_addr_to_kernel(msg.msg_name, |
| 2214 | kmsg->msg_namelen, |
| 2215 | kmsg->msg_name); |
| 2216 | if (err < 0) |
| 2217 | return err; |
| 2218 | } |
| 2219 | } else { |
| 2220 | kmsg->msg_name = NULL; |
| 2221 | kmsg->msg_namelen = 0; |
| 2222 | } |
| 2223 | |
| 2224 | if (msg.msg_iovlen > UIO_MAXIOV) |
| 2225 | return -EMSGSIZE; |
| 2226 | |
| 2227 | kmsg->msg_iocb = NULL; |
| 2228 | |
| 2229 | err = import_iovec(save_addr ? READ : WRITE, |
| 2230 | msg.msg_iov, msg.msg_iovlen, |
| 2231 | UIO_FASTIOV, iov, &kmsg->msg_iter); |
| 2232 | return err < 0 ? err : 0; |
| 2233 | } |
| 2234 | |
| 2235 | static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, |
| 2236 | struct msghdr *msg_sys, unsigned int flags, |
| 2237 | struct used_address *used_address, |
| 2238 | unsigned int allowed_msghdr_flags) |
| 2239 | { |
| 2240 | struct compat_msghdr __user *msg_compat = |
| 2241 | (struct compat_msghdr __user *)msg; |
| 2242 | struct sockaddr_storage address; |
| 2243 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
| 2244 | unsigned char ctl[sizeof(struct cmsghdr) + 20] |
| 2245 | __aligned(sizeof(__kernel_size_t)); |
| 2246 | /* 20 is size of ipv6_pktinfo */ |
| 2247 | unsigned char *ctl_buf = ctl; |
| 2248 | int ctl_len; |
| 2249 | ssize_t err; |
| 2250 | |
| 2251 | msg_sys->msg_name = &address; |
| 2252 | |
| 2253 | if (MSG_CMSG_COMPAT & flags) |
| 2254 | err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov); |
| 2255 | else |
| 2256 | err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov); |
| 2257 | if (err < 0) |
| 2258 | return err; |
| 2259 | |
| 2260 | err = -ENOBUFS; |
| 2261 | |
| 2262 | if (msg_sys->msg_controllen > INT_MAX) |
| 2263 | goto out_freeiov; |
| 2264 | flags |= (msg_sys->msg_flags & allowed_msghdr_flags); |
| 2265 | ctl_len = msg_sys->msg_controllen; |
| 2266 | if ((MSG_CMSG_COMPAT & flags) && ctl_len) { |
| 2267 | err = |
| 2268 | cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl, |
| 2269 | sizeof(ctl)); |
| 2270 | if (err) |
| 2271 | goto out_freeiov; |
| 2272 | ctl_buf = msg_sys->msg_control; |
| 2273 | ctl_len = msg_sys->msg_controllen; |
| 2274 | } else if (ctl_len) { |
| 2275 | BUILD_BUG_ON(sizeof(struct cmsghdr) != |
| 2276 | CMSG_ALIGN(sizeof(struct cmsghdr))); |
| 2277 | if (ctl_len > sizeof(ctl)) { |
| 2278 | ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL); |
| 2279 | if (ctl_buf == NULL) |
| 2280 | goto out_freeiov; |
| 2281 | } |
| 2282 | err = -EFAULT; |
| 2283 | /* |
| 2284 | * Careful! Before this, msg_sys->msg_control contains a user pointer. |
| 2285 | * Afterwards, it will be a kernel pointer. Thus the compiler-assisted |
| 2286 | * checking falls down on this. |
| 2287 | */ |
| 2288 | if (copy_from_user(ctl_buf, |
| 2289 | (void __user __force *)msg_sys->msg_control, |
| 2290 | ctl_len)) |
| 2291 | goto out_freectl; |
| 2292 | msg_sys->msg_control = ctl_buf; |
| 2293 | } |
| 2294 | msg_sys->msg_flags = flags; |
| 2295 | |
| 2296 | if (sock->file->f_flags & O_NONBLOCK) |
| 2297 | msg_sys->msg_flags |= MSG_DONTWAIT; |
| 2298 | /* |
| 2299 | * If this is sendmmsg() and current destination address is same as |
| 2300 | * previously succeeded address, omit asking LSM's decision. |
| 2301 | * used_address->name_len is initialized to UINT_MAX so that the first |
| 2302 | * destination address never matches. |
| 2303 | */ |
| 2304 | if (used_address && msg_sys->msg_name && |
| 2305 | used_address->name_len == msg_sys->msg_namelen && |
| 2306 | !memcmp(&used_address->name, msg_sys->msg_name, |
| 2307 | used_address->name_len)) { |
| 2308 | err = sock_sendmsg_nosec(sock, msg_sys); |
| 2309 | goto out_freectl; |
| 2310 | } |
| 2311 | err = sock_sendmsg(sock, msg_sys); |
| 2312 | /* |
| 2313 | * If this is sendmmsg() and sending to current destination address was |
| 2314 | * successful, remember it. |
| 2315 | */ |
| 2316 | if (used_address && err >= 0) { |
| 2317 | used_address->name_len = msg_sys->msg_namelen; |
| 2318 | if (msg_sys->msg_name) |
| 2319 | memcpy(&used_address->name, msg_sys->msg_name, |
| 2320 | used_address->name_len); |
| 2321 | } |
| 2322 | |
| 2323 | out_freectl: |
| 2324 | if (ctl_buf != ctl) |
| 2325 | sock_kfree_s(sock->sk, ctl_buf, ctl_len); |
| 2326 | out_freeiov: |
| 2327 | kfree(iov); |
| 2328 | return err; |
| 2329 | } |
| 2330 | |
| 2331 | /* |
| 2332 | * BSD sendmsg interface |
| 2333 | */ |
| 2334 | long __sys_sendmsg_sock(struct socket *sock, struct user_msghdr __user *msg, |
| 2335 | unsigned int flags) |
| 2336 | { |
| 2337 | struct msghdr msg_sys; |
| 2338 | |
| 2339 | return ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
| 2340 | } |
| 2341 | |
| 2342 | long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
| 2343 | bool forbid_cmsg_compat) |
| 2344 | { |
| 2345 | int fput_needed, err; |
| 2346 | struct msghdr msg_sys; |
| 2347 | struct socket *sock; |
| 2348 | |
| 2349 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
| 2350 | return -EINVAL; |
| 2351 | |
| 2352 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2353 | if (!sock) |
| 2354 | goto out; |
| 2355 | |
| 2356 | err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); |
| 2357 | |
| 2358 | fput_light(sock->file, fput_needed); |
| 2359 | out: |
| 2360 | return err; |
| 2361 | } |
| 2362 | |
| 2363 | SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags) |
| 2364 | { |
| 2365 | return __sys_sendmsg(fd, msg, flags, true); |
| 2366 | } |
| 2367 | |
| 2368 | /* |
| 2369 | * Linux sendmmsg interface |
| 2370 | */ |
| 2371 | |
| 2372 | int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, |
| 2373 | unsigned int flags, bool forbid_cmsg_compat) |
| 2374 | { |
| 2375 | int fput_needed, err, datagrams; |
| 2376 | struct socket *sock; |
| 2377 | struct mmsghdr __user *entry; |
| 2378 | struct compat_mmsghdr __user *compat_entry; |
| 2379 | struct msghdr msg_sys; |
| 2380 | struct used_address used_address; |
| 2381 | unsigned int oflags = flags; |
| 2382 | |
| 2383 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
| 2384 | return -EINVAL; |
| 2385 | |
| 2386 | if (vlen > UIO_MAXIOV) |
| 2387 | vlen = UIO_MAXIOV; |
| 2388 | |
| 2389 | datagrams = 0; |
| 2390 | |
| 2391 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2392 | if (!sock) |
| 2393 | return err; |
| 2394 | |
| 2395 | used_address.name_len = UINT_MAX; |
| 2396 | entry = mmsg; |
| 2397 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
| 2398 | err = 0; |
| 2399 | flags |= MSG_BATCH; |
| 2400 | |
| 2401 | while (datagrams < vlen) { |
| 2402 | if (datagrams == vlen - 1) |
| 2403 | flags = oflags; |
| 2404 | |
| 2405 | if (MSG_CMSG_COMPAT & flags) { |
| 2406 | err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry, |
| 2407 | &msg_sys, flags, &used_address, MSG_EOR); |
| 2408 | if (err < 0) |
| 2409 | break; |
| 2410 | err = __put_user(err, &compat_entry->msg_len); |
| 2411 | ++compat_entry; |
| 2412 | } else { |
| 2413 | err = ___sys_sendmsg(sock, |
| 2414 | (struct user_msghdr __user *)entry, |
| 2415 | &msg_sys, flags, &used_address, MSG_EOR); |
| 2416 | if (err < 0) |
| 2417 | break; |
| 2418 | err = put_user(err, &entry->msg_len); |
| 2419 | ++entry; |
| 2420 | } |
| 2421 | |
| 2422 | if (err) |
| 2423 | break; |
| 2424 | ++datagrams; |
| 2425 | if (msg_data_left(&msg_sys)) |
| 2426 | break; |
| 2427 | cond_resched(); |
| 2428 | } |
| 2429 | |
| 2430 | fput_light(sock->file, fput_needed); |
| 2431 | |
| 2432 | /* We only return an error if no datagrams were able to be sent */ |
| 2433 | if (datagrams != 0) |
| 2434 | return datagrams; |
| 2435 | |
| 2436 | return err; |
| 2437 | } |
| 2438 | |
| 2439 | SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg, |
| 2440 | unsigned int, vlen, unsigned int, flags) |
| 2441 | { |
| 2442 | return __sys_sendmmsg(fd, mmsg, vlen, flags, true); |
| 2443 | } |
| 2444 | |
| 2445 | static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, |
| 2446 | struct msghdr *msg_sys, unsigned int flags, int nosec) |
| 2447 | { |
| 2448 | struct compat_msghdr __user *msg_compat = |
| 2449 | (struct compat_msghdr __user *)msg; |
| 2450 | struct iovec iovstack[UIO_FASTIOV]; |
| 2451 | struct iovec *iov = iovstack; |
| 2452 | unsigned long cmsg_ptr; |
| 2453 | int len; |
| 2454 | ssize_t err; |
| 2455 | |
| 2456 | /* kernel mode address */ |
| 2457 | struct sockaddr_storage addr; |
| 2458 | |
| 2459 | /* user mode address pointers */ |
| 2460 | struct sockaddr __user *uaddr; |
| 2461 | int __user *uaddr_len = COMPAT_NAMELEN(msg); |
| 2462 | |
| 2463 | msg_sys->msg_name = &addr; |
| 2464 | |
| 2465 | if (MSG_CMSG_COMPAT & flags) |
| 2466 | err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov); |
| 2467 | else |
| 2468 | err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov); |
| 2469 | if (err < 0) |
| 2470 | return err; |
| 2471 | |
| 2472 | cmsg_ptr = (unsigned long)msg_sys->msg_control; |
| 2473 | msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); |
| 2474 | |
| 2475 | /* We assume all kernel code knows the size of sockaddr_storage */ |
| 2476 | msg_sys->msg_namelen = 0; |
| 2477 | |
| 2478 | if (sock->file->f_flags & O_NONBLOCK) |
| 2479 | flags |= MSG_DONTWAIT; |
| 2480 | err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags); |
| 2481 | if (err < 0) |
| 2482 | goto out_freeiov; |
| 2483 | len = err; |
| 2484 | |
| 2485 | if (uaddr != NULL) { |
| 2486 | err = move_addr_to_user(&addr, |
| 2487 | msg_sys->msg_namelen, uaddr, |
| 2488 | uaddr_len); |
| 2489 | if (err < 0) |
| 2490 | goto out_freeiov; |
| 2491 | } |
| 2492 | err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT), |
| 2493 | COMPAT_FLAGS(msg)); |
| 2494 | if (err) |
| 2495 | goto out_freeiov; |
| 2496 | if (MSG_CMSG_COMPAT & flags) |
| 2497 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
| 2498 | &msg_compat->msg_controllen); |
| 2499 | else |
| 2500 | err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr, |
| 2501 | &msg->msg_controllen); |
| 2502 | if (err) |
| 2503 | goto out_freeiov; |
| 2504 | err = len; |
| 2505 | |
| 2506 | out_freeiov: |
| 2507 | kfree(iov); |
| 2508 | return err; |
| 2509 | } |
| 2510 | |
| 2511 | /* |
| 2512 | * BSD recvmsg interface |
| 2513 | */ |
| 2514 | |
| 2515 | long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *msg, |
| 2516 | unsigned int flags) |
| 2517 | { |
| 2518 | struct msghdr msg_sys; |
| 2519 | |
| 2520 | return ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
| 2521 | } |
| 2522 | |
| 2523 | long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, |
| 2524 | bool forbid_cmsg_compat) |
| 2525 | { |
| 2526 | int fput_needed, err; |
| 2527 | struct msghdr msg_sys; |
| 2528 | struct socket *sock; |
| 2529 | |
| 2530 | if (forbid_cmsg_compat && (flags & MSG_CMSG_COMPAT)) |
| 2531 | return -EINVAL; |
| 2532 | |
| 2533 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2534 | if (!sock) |
| 2535 | goto out; |
| 2536 | |
| 2537 | err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); |
| 2538 | |
| 2539 | fput_light(sock->file, fput_needed); |
| 2540 | out: |
| 2541 | return err; |
| 2542 | } |
| 2543 | |
| 2544 | SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg, |
| 2545 | unsigned int, flags) |
| 2546 | { |
| 2547 | return __sys_recvmsg(fd, msg, flags, true); |
| 2548 | } |
| 2549 | |
| 2550 | /* |
| 2551 | * Linux recvmmsg interface |
| 2552 | */ |
| 2553 | |
| 2554 | static int do_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
| 2555 | unsigned int vlen, unsigned int flags, |
| 2556 | struct timespec64 *timeout) |
| 2557 | { |
| 2558 | int fput_needed, err, datagrams; |
| 2559 | struct socket *sock; |
| 2560 | struct mmsghdr __user *entry; |
| 2561 | struct compat_mmsghdr __user *compat_entry; |
| 2562 | struct msghdr msg_sys; |
| 2563 | struct timespec64 end_time; |
| 2564 | struct timespec64 timeout64; |
| 2565 | |
| 2566 | if (timeout && |
| 2567 | poll_select_set_timeout(&end_time, timeout->tv_sec, |
| 2568 | timeout->tv_nsec)) |
| 2569 | return -EINVAL; |
| 2570 | |
| 2571 | datagrams = 0; |
| 2572 | |
| 2573 | sock = sockfd_lookup_light(fd, &err, &fput_needed); |
| 2574 | if (!sock) |
| 2575 | return err; |
| 2576 | |
| 2577 | if (likely(!(flags & MSG_ERRQUEUE))) { |
| 2578 | err = sock_error(sock->sk); |
| 2579 | if (err) { |
| 2580 | datagrams = err; |
| 2581 | goto out_put; |
| 2582 | } |
| 2583 | } |
| 2584 | |
| 2585 | entry = mmsg; |
| 2586 | compat_entry = (struct compat_mmsghdr __user *)mmsg; |
| 2587 | |
| 2588 | while (datagrams < vlen) { |
| 2589 | /* |
| 2590 | * No need to ask LSM for more than the first datagram. |
| 2591 | */ |
| 2592 | if (MSG_CMSG_COMPAT & flags) { |
| 2593 | err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry, |
| 2594 | &msg_sys, flags & ~MSG_WAITFORONE, |
| 2595 | datagrams); |
| 2596 | if (err < 0) |
| 2597 | break; |
| 2598 | err = __put_user(err, &compat_entry->msg_len); |
| 2599 | ++compat_entry; |
| 2600 | } else { |
| 2601 | err = ___sys_recvmsg(sock, |
| 2602 | (struct user_msghdr __user *)entry, |
| 2603 | &msg_sys, flags & ~MSG_WAITFORONE, |
| 2604 | datagrams); |
| 2605 | if (err < 0) |
| 2606 | break; |
| 2607 | err = put_user(err, &entry->msg_len); |
| 2608 | ++entry; |
| 2609 | } |
| 2610 | |
| 2611 | if (err) |
| 2612 | break; |
| 2613 | ++datagrams; |
| 2614 | |
| 2615 | /* MSG_WAITFORONE turns on MSG_DONTWAIT after one packet */ |
| 2616 | if (flags & MSG_WAITFORONE) |
| 2617 | flags |= MSG_DONTWAIT; |
| 2618 | |
| 2619 | if (timeout) { |
| 2620 | ktime_get_ts64(&timeout64); |
| 2621 | *timeout = timespec64_sub(end_time, timeout64); |
| 2622 | if (timeout->tv_sec < 0) { |
| 2623 | timeout->tv_sec = timeout->tv_nsec = 0; |
| 2624 | break; |
| 2625 | } |
| 2626 | |
| 2627 | /* Timeout, return less than vlen datagrams */ |
| 2628 | if (timeout->tv_nsec == 0 && timeout->tv_sec == 0) |
| 2629 | break; |
| 2630 | } |
| 2631 | |
| 2632 | /* Out of band data, return right away */ |
| 2633 | if (msg_sys.msg_flags & MSG_OOB) |
| 2634 | break; |
| 2635 | cond_resched(); |
| 2636 | } |
| 2637 | |
| 2638 | if (err == 0) |
| 2639 | goto out_put; |
| 2640 | |
| 2641 | if (datagrams == 0) { |
| 2642 | datagrams = err; |
| 2643 | goto out_put; |
| 2644 | } |
| 2645 | |
| 2646 | /* |
| 2647 | * We may return less entries than requested (vlen) if the |
| 2648 | * sock is non block and there aren't enough datagrams... |
| 2649 | */ |
| 2650 | if (err != -EAGAIN) { |
| 2651 | /* |
| 2652 | * ... or if recvmsg returns an error after we |
| 2653 | * received some datagrams, where we record the |
| 2654 | * error to return on the next call or if the |
| 2655 | * app asks about it using getsockopt(SO_ERROR). |
| 2656 | */ |
| 2657 | sock->sk->sk_err = -err; |
| 2658 | } |
| 2659 | out_put: |
| 2660 | fput_light(sock->file, fput_needed); |
| 2661 | |
| 2662 | return datagrams; |
| 2663 | } |
| 2664 | |
| 2665 | int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, |
| 2666 | unsigned int vlen, unsigned int flags, |
| 2667 | struct __kernel_timespec __user *timeout, |
| 2668 | struct old_timespec32 __user *timeout32) |
| 2669 | { |
| 2670 | int datagrams; |
| 2671 | struct timespec64 timeout_sys; |
| 2672 | |
| 2673 | if (timeout && get_timespec64(&timeout_sys, timeout)) |
| 2674 | return -EFAULT; |
| 2675 | |
| 2676 | if (timeout32 && get_old_timespec32(&timeout_sys, timeout32)) |
| 2677 | return -EFAULT; |
| 2678 | |
| 2679 | if (!timeout && !timeout32) |
| 2680 | return do_recvmmsg(fd, mmsg, vlen, flags, NULL); |
| 2681 | |
| 2682 | datagrams = do_recvmmsg(fd, mmsg, vlen, flags, &timeout_sys); |
| 2683 | |
| 2684 | if (datagrams <= 0) |
| 2685 | return datagrams; |
| 2686 | |
| 2687 | if (timeout && put_timespec64(&timeout_sys, timeout)) |
| 2688 | datagrams = -EFAULT; |
| 2689 | |
| 2690 | if (timeout32 && put_old_timespec32(&timeout_sys, timeout32)) |
| 2691 | datagrams = -EFAULT; |
| 2692 | |
| 2693 | return datagrams; |
| 2694 | } |
| 2695 | |
| 2696 | SYSCALL_DEFINE5(recvmmsg, int, fd, struct mmsghdr __user *, mmsg, |
| 2697 | unsigned int, vlen, unsigned int, flags, |
| 2698 | struct __kernel_timespec __user *, timeout) |
| 2699 | { |
| 2700 | if (flags & MSG_CMSG_COMPAT) |
| 2701 | return -EINVAL; |
| 2702 | |
| 2703 | return __sys_recvmmsg(fd, mmsg, vlen, flags, timeout, NULL); |
| 2704 | } |
| 2705 | |
| 2706 | #ifdef CONFIG_COMPAT_32BIT_TIME |
| 2707 | SYSCALL_DEFINE5(recvmmsg_time32, int, fd, struct mmsghdr __user *, mmsg, |
| 2708 | unsigned int, vlen, unsigned int, flags, |
| 2709 | struct old_timespec32 __user *, timeout) |
| 2710 | { |
| 2711 | if (flags & MSG_CMSG_COMPAT) |
| 2712 | return -EINVAL; |
| 2713 | |
| 2714 | return __sys_recvmmsg(fd, mmsg, vlen, flags, NULL, timeout); |
| 2715 | } |
| 2716 | #endif |
| 2717 | |
| 2718 | #ifdef __ARCH_WANT_SYS_SOCKETCALL |
| 2719 | /* Argument list sizes for sys_socketcall */ |
| 2720 | #define AL(x) ((x) * sizeof(unsigned long)) |
| 2721 | static const unsigned char nargs[21] = { |
| 2722 | AL(0), AL(3), AL(3), AL(3), AL(2), AL(3), |
| 2723 | AL(3), AL(3), AL(4), AL(4), AL(4), AL(6), |
| 2724 | AL(6), AL(2), AL(5), AL(5), AL(3), AL(3), |
| 2725 | AL(4), AL(5), AL(4) |
| 2726 | }; |
| 2727 | |
| 2728 | #undef AL |
| 2729 | |
| 2730 | /* |
| 2731 | * System call vectors. |
| 2732 | * |
| 2733 | * Argument checking cleaned up. Saved 20% in size. |
| 2734 | * This function doesn't need to set the kernel lock because |
| 2735 | * it is set by the callees. |
| 2736 | */ |
| 2737 | |
| 2738 | SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args) |
| 2739 | { |
| 2740 | unsigned long a[AUDITSC_ARGS]; |
| 2741 | unsigned long a0, a1; |
| 2742 | int err; |
| 2743 | unsigned int len; |
| 2744 | |
| 2745 | if (call < 1 || call > SYS_SENDMMSG) |
| 2746 | return -EINVAL; |
| 2747 | call = array_index_nospec(call, SYS_SENDMMSG + 1); |
| 2748 | |
| 2749 | len = nargs[call]; |
| 2750 | if (len > sizeof(a)) |
| 2751 | return -EINVAL; |
| 2752 | |
| 2753 | /* copy_from_user should be SMP safe. */ |
| 2754 | if (copy_from_user(a, args, len)) |
| 2755 | return -EFAULT; |
| 2756 | |
| 2757 | err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); |
| 2758 | if (err) |
| 2759 | return err; |
| 2760 | |
| 2761 | a0 = a[0]; |
| 2762 | a1 = a[1]; |
| 2763 | |
| 2764 | switch (call) { |
| 2765 | case SYS_SOCKET: |
| 2766 | err = __sys_socket(a0, a1, a[2]); |
| 2767 | break; |
| 2768 | case SYS_BIND: |
| 2769 | err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]); |
| 2770 | break; |
| 2771 | case SYS_CONNECT: |
| 2772 | err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]); |
| 2773 | break; |
| 2774 | case SYS_LISTEN: |
| 2775 | err = __sys_listen(a0, a1); |
| 2776 | break; |
| 2777 | case SYS_ACCEPT: |
| 2778 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
| 2779 | (int __user *)a[2], 0); |
| 2780 | break; |
| 2781 | case SYS_GETSOCKNAME: |
| 2782 | err = |
| 2783 | __sys_getsockname(a0, (struct sockaddr __user *)a1, |
| 2784 | (int __user *)a[2]); |
| 2785 | break; |
| 2786 | case SYS_GETPEERNAME: |
| 2787 | err = |
| 2788 | __sys_getpeername(a0, (struct sockaddr __user *)a1, |
| 2789 | (int __user *)a[2]); |
| 2790 | break; |
| 2791 | case SYS_SOCKETPAIR: |
| 2792 | err = __sys_socketpair(a0, a1, a[2], (int __user *)a[3]); |
| 2793 | break; |
| 2794 | case SYS_SEND: |
| 2795 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
| 2796 | NULL, 0); |
| 2797 | break; |
| 2798 | case SYS_SENDTO: |
| 2799 | err = __sys_sendto(a0, (void __user *)a1, a[2], a[3], |
| 2800 | (struct sockaddr __user *)a[4], a[5]); |
| 2801 | break; |
| 2802 | case SYS_RECV: |
| 2803 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
| 2804 | NULL, NULL); |
| 2805 | break; |
| 2806 | case SYS_RECVFROM: |
| 2807 | err = __sys_recvfrom(a0, (void __user *)a1, a[2], a[3], |
| 2808 | (struct sockaddr __user *)a[4], |
| 2809 | (int __user *)a[5]); |
| 2810 | break; |
| 2811 | case SYS_SHUTDOWN: |
| 2812 | err = __sys_shutdown(a0, a1); |
| 2813 | break; |
| 2814 | case SYS_SETSOCKOPT: |
| 2815 | err = __sys_setsockopt(a0, a1, a[2], (char __user *)a[3], |
| 2816 | a[4]); |
| 2817 | break; |
| 2818 | case SYS_GETSOCKOPT: |
| 2819 | err = |
| 2820 | __sys_getsockopt(a0, a1, a[2], (char __user *)a[3], |
| 2821 | (int __user *)a[4]); |
| 2822 | break; |
| 2823 | case SYS_SENDMSG: |
| 2824 | err = __sys_sendmsg(a0, (struct user_msghdr __user *)a1, |
| 2825 | a[2], true); |
| 2826 | break; |
| 2827 | case SYS_SENDMMSG: |
| 2828 | err = __sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], |
| 2829 | a[3], true); |
| 2830 | break; |
| 2831 | case SYS_RECVMSG: |
| 2832 | err = __sys_recvmsg(a0, (struct user_msghdr __user *)a1, |
| 2833 | a[2], true); |
| 2834 | break; |
| 2835 | case SYS_RECVMMSG: |
| 2836 | if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME)) |
| 2837 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
| 2838 | a[2], a[3], |
| 2839 | (struct __kernel_timespec __user *)a[4], |
| 2840 | NULL); |
| 2841 | else |
| 2842 | err = __sys_recvmmsg(a0, (struct mmsghdr __user *)a1, |
| 2843 | a[2], a[3], NULL, |
| 2844 | (struct old_timespec32 __user *)a[4]); |
| 2845 | break; |
| 2846 | case SYS_ACCEPT4: |
| 2847 | err = __sys_accept4(a0, (struct sockaddr __user *)a1, |
| 2848 | (int __user *)a[2], a[3]); |
| 2849 | break; |
| 2850 | default: |
| 2851 | err = -EINVAL; |
| 2852 | break; |
| 2853 | } |
| 2854 | return err; |
| 2855 | } |
| 2856 | |
| 2857 | #endif /* __ARCH_WANT_SYS_SOCKETCALL */ |
| 2858 | |
| 2859 | /** |
| 2860 | * sock_register - add a socket protocol handler |
| 2861 | * @ops: description of protocol |
| 2862 | * |
| 2863 | * This function is called by a protocol handler that wants to |
| 2864 | * advertise its address family, and have it linked into the |
| 2865 | * socket interface. The value ops->family corresponds to the |
| 2866 | * socket system call protocol family. |
| 2867 | */ |
| 2868 | int sock_register(const struct net_proto_family *ops) |
| 2869 | { |
| 2870 | int err; |
| 2871 | |
| 2872 | if (ops->family >= NPROTO) { |
| 2873 | pr_crit("protocol %d >= NPROTO(%d)\n", ops->family, NPROTO); |
| 2874 | return -ENOBUFS; |
| 2875 | } |
| 2876 | |
| 2877 | spin_lock(&net_family_lock); |
| 2878 | if (rcu_dereference_protected(net_families[ops->family], |
| 2879 | lockdep_is_held(&net_family_lock))) |
| 2880 | err = -EEXIST; |
| 2881 | else { |
| 2882 | rcu_assign_pointer(net_families[ops->family], ops); |
| 2883 | err = 0; |
| 2884 | } |
| 2885 | spin_unlock(&net_family_lock); |
| 2886 | |
| 2887 | pr_info("NET: Registered protocol family %d\n", ops->family); |
| 2888 | return err; |
| 2889 | } |
| 2890 | EXPORT_SYMBOL(sock_register); |
| 2891 | |
| 2892 | /** |
| 2893 | * sock_unregister - remove a protocol handler |
| 2894 | * @family: protocol family to remove |
| 2895 | * |
| 2896 | * This function is called by a protocol handler that wants to |
| 2897 | * remove its address family, and have it unlinked from the |
| 2898 | * new socket creation. |
| 2899 | * |
| 2900 | * If protocol handler is a module, then it can use module reference |
| 2901 | * counts to protect against new references. If protocol handler is not |
| 2902 | * a module then it needs to provide its own protection in |
| 2903 | * the ops->create routine. |
| 2904 | */ |
| 2905 | void sock_unregister(int family) |
| 2906 | { |
| 2907 | BUG_ON(family < 0 || family >= NPROTO); |
| 2908 | |
| 2909 | spin_lock(&net_family_lock); |
| 2910 | RCU_INIT_POINTER(net_families[family], NULL); |
| 2911 | spin_unlock(&net_family_lock); |
| 2912 | |
| 2913 | synchronize_rcu(); |
| 2914 | |
| 2915 | pr_info("NET: Unregistered protocol family %d\n", family); |
| 2916 | } |
| 2917 | EXPORT_SYMBOL(sock_unregister); |
| 2918 | |
| 2919 | bool sock_is_registered(int family) |
| 2920 | { |
| 2921 | return family < NPROTO && rcu_access_pointer(net_families[family]); |
| 2922 | } |
| 2923 | |
| 2924 | static int __init sock_init(void) |
| 2925 | { |
| 2926 | int err; |
| 2927 | /* |
| 2928 | * Initialize the network sysctl infrastructure. |
| 2929 | */ |
| 2930 | err = net_sysctl_init(); |
| 2931 | if (err) |
| 2932 | goto out; |
| 2933 | |
| 2934 | /* |
| 2935 | * Initialize skbuff SLAB cache |
| 2936 | */ |
| 2937 | skb_init(); |
| 2938 | |
| 2939 | /* |
| 2940 | * Initialize the protocols module. |
| 2941 | */ |
| 2942 | |
| 2943 | init_inodecache(); |
| 2944 | |
| 2945 | err = register_filesystem(&sock_fs_type); |
| 2946 | if (err) |
| 2947 | goto out_fs; |
| 2948 | sock_mnt = kern_mount(&sock_fs_type); |
| 2949 | if (IS_ERR(sock_mnt)) { |
| 2950 | err = PTR_ERR(sock_mnt); |
| 2951 | goto out_mount; |
| 2952 | } |
| 2953 | |
| 2954 | /* The real protocol initialization is performed in later initcalls. |
| 2955 | */ |
| 2956 | |
| 2957 | #ifdef CONFIG_NETFILTER |
| 2958 | err = netfilter_init(); |
| 2959 | if (err) |
| 2960 | goto out; |
| 2961 | #endif |
| 2962 | |
| 2963 | ptp_classifier_init(); |
| 2964 | |
| 2965 | out: |
| 2966 | return err; |
| 2967 | |
| 2968 | out_mount: |
| 2969 | unregister_filesystem(&sock_fs_type); |
| 2970 | out_fs: |
| 2971 | goto out; |
| 2972 | } |
| 2973 | |
| 2974 | core_initcall(sock_init); /* early initcall */ |
| 2975 | |
| 2976 | #ifdef CONFIG_PROC_FS |
| 2977 | void socket_seq_show(struct seq_file *seq) |
| 2978 | { |
| 2979 | seq_printf(seq, "sockets: used %d\n", |
| 2980 | sock_inuse_get(seq->private)); |
| 2981 | } |
| 2982 | #endif /* CONFIG_PROC_FS */ |
| 2983 | |
| 2984 | #ifdef CONFIG_COMPAT |
| 2985 | static int compat_dev_ifconf(struct net *net, struct compat_ifconf __user *uifc32) |
| 2986 | { |
| 2987 | struct compat_ifconf ifc32; |
| 2988 | struct ifconf ifc; |
| 2989 | int err; |
| 2990 | |
| 2991 | if (copy_from_user(&ifc32, uifc32, sizeof(struct compat_ifconf))) |
| 2992 | return -EFAULT; |
| 2993 | |
| 2994 | ifc.ifc_len = ifc32.ifc_len; |
| 2995 | ifc.ifc_req = compat_ptr(ifc32.ifcbuf); |
| 2996 | |
| 2997 | rtnl_lock(); |
| 2998 | err = dev_ifconf(net, &ifc, sizeof(struct compat_ifreq)); |
| 2999 | rtnl_unlock(); |
| 3000 | if (err) |
| 3001 | return err; |
| 3002 | |
| 3003 | ifc32.ifc_len = ifc.ifc_len; |
| 3004 | if (copy_to_user(uifc32, &ifc32, sizeof(struct compat_ifconf))) |
| 3005 | return -EFAULT; |
| 3006 | |
| 3007 | return 0; |
| 3008 | } |
| 3009 | |
| 3010 | static int ethtool_ioctl(struct net *net, struct compat_ifreq __user *ifr32) |
| 3011 | { |
| 3012 | struct compat_ethtool_rxnfc __user *compat_rxnfc; |
| 3013 | bool convert_in = false, convert_out = false; |
| 3014 | size_t buf_size = 0; |
| 3015 | struct ethtool_rxnfc __user *rxnfc = NULL; |
| 3016 | struct ifreq ifr; |
| 3017 | u32 rule_cnt = 0, actual_rule_cnt; |
| 3018 | u32 ethcmd; |
| 3019 | u32 data; |
| 3020 | int ret; |
| 3021 | |
| 3022 | if (get_user(data, &ifr32->ifr_ifru.ifru_data)) |
| 3023 | return -EFAULT; |
| 3024 | |
| 3025 | compat_rxnfc = compat_ptr(data); |
| 3026 | |
| 3027 | if (get_user(ethcmd, &compat_rxnfc->cmd)) |
| 3028 | return -EFAULT; |
| 3029 | |
| 3030 | /* Most ethtool structures are defined without padding. |
| 3031 | * Unfortunately struct ethtool_rxnfc is an exception. |
| 3032 | */ |
| 3033 | switch (ethcmd) { |
| 3034 | default: |
| 3035 | break; |
| 3036 | case ETHTOOL_GRXCLSRLALL: |
| 3037 | /* Buffer size is variable */ |
| 3038 | if (get_user(rule_cnt, &compat_rxnfc->rule_cnt)) |
| 3039 | return -EFAULT; |
| 3040 | if (rule_cnt > KMALLOC_MAX_SIZE / sizeof(u32)) |
| 3041 | return -ENOMEM; |
| 3042 | buf_size += rule_cnt * sizeof(u32); |
| 3043 | /* fall through */ |
| 3044 | case ETHTOOL_GRXRINGS: |
| 3045 | case ETHTOOL_GRXCLSRLCNT: |
| 3046 | case ETHTOOL_GRXCLSRULE: |
| 3047 | case ETHTOOL_SRXCLSRLINS: |
| 3048 | convert_out = true; |
| 3049 | /* fall through */ |
| 3050 | case ETHTOOL_SRXCLSRLDEL: |
| 3051 | buf_size += sizeof(struct ethtool_rxnfc); |
| 3052 | convert_in = true; |
| 3053 | rxnfc = compat_alloc_user_space(buf_size); |
| 3054 | break; |
| 3055 | } |
| 3056 | |
| 3057 | if (copy_from_user(&ifr.ifr_name, &ifr32->ifr_name, IFNAMSIZ)) |
| 3058 | return -EFAULT; |
| 3059 | |
| 3060 | ifr.ifr_data = convert_in ? rxnfc : (void __user *)compat_rxnfc; |
| 3061 | |
| 3062 | if (convert_in) { |
| 3063 | /* We expect there to be holes between fs.m_ext and |
| 3064 | * fs.ring_cookie and at the end of fs, but nowhere else. |
| 3065 | */ |
| 3066 | BUILD_BUG_ON(offsetof(struct compat_ethtool_rxnfc, fs.m_ext) + |
| 3067 | sizeof(compat_rxnfc->fs.m_ext) != |
| 3068 | offsetof(struct ethtool_rxnfc, fs.m_ext) + |
| 3069 | sizeof(rxnfc->fs.m_ext)); |
| 3070 | BUILD_BUG_ON( |
| 3071 | offsetof(struct compat_ethtool_rxnfc, fs.location) - |
| 3072 | offsetof(struct compat_ethtool_rxnfc, fs.ring_cookie) != |
| 3073 | offsetof(struct ethtool_rxnfc, fs.location) - |
| 3074 | offsetof(struct ethtool_rxnfc, fs.ring_cookie)); |
| 3075 | |
| 3076 | if (copy_in_user(rxnfc, compat_rxnfc, |
| 3077 | (void __user *)(&rxnfc->fs.m_ext + 1) - |
| 3078 | (void __user *)rxnfc) || |
| 3079 | copy_in_user(&rxnfc->fs.ring_cookie, |
| 3080 | &compat_rxnfc->fs.ring_cookie, |
| 3081 | (void __user *)(&rxnfc->fs.location + 1) - |
| 3082 | (void __user *)&rxnfc->fs.ring_cookie)) |
| 3083 | return -EFAULT; |
| 3084 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { |
| 3085 | if (put_user(rule_cnt, &rxnfc->rule_cnt)) |
| 3086 | return -EFAULT; |
| 3087 | } else if (copy_in_user(&rxnfc->rule_cnt, |
| 3088 | &compat_rxnfc->rule_cnt, |
| 3089 | sizeof(rxnfc->rule_cnt))) |
| 3090 | return -EFAULT; |
| 3091 | } |
| 3092 | |
| 3093 | ret = dev_ioctl(net, SIOCETHTOOL, &ifr, NULL); |
| 3094 | if (ret) |
| 3095 | return ret; |
| 3096 | |
| 3097 | if (convert_out) { |
| 3098 | if (copy_in_user(compat_rxnfc, rxnfc, |
| 3099 | (const void __user *)(&rxnfc->fs.m_ext + 1) - |
| 3100 | (const void __user *)rxnfc) || |
| 3101 | copy_in_user(&compat_rxnfc->fs.ring_cookie, |
| 3102 | &rxnfc->fs.ring_cookie, |
| 3103 | (const void __user *)(&rxnfc->fs.location + 1) - |
| 3104 | (const void __user *)&rxnfc->fs.ring_cookie) || |
| 3105 | copy_in_user(&compat_rxnfc->rule_cnt, &rxnfc->rule_cnt, |
| 3106 | sizeof(rxnfc->rule_cnt))) |
| 3107 | return -EFAULT; |
| 3108 | |
| 3109 | if (ethcmd == ETHTOOL_GRXCLSRLALL) { |
| 3110 | /* As an optimisation, we only copy the actual |
| 3111 | * number of rules that the underlying |
| 3112 | * function returned. Since Mallory might |
| 3113 | * change the rule count in user memory, we |
| 3114 | * check that it is less than the rule count |
| 3115 | * originally given (as the user buffer size), |
| 3116 | * which has been range-checked. |
| 3117 | */ |
| 3118 | if (get_user(actual_rule_cnt, &rxnfc->rule_cnt)) |
| 3119 | return -EFAULT; |
| 3120 | if (actual_rule_cnt < rule_cnt) |
| 3121 | rule_cnt = actual_rule_cnt; |
| 3122 | if (copy_in_user(&compat_rxnfc->rule_locs[0], |
| 3123 | &rxnfc->rule_locs[0], |
| 3124 | rule_cnt * sizeof(u32))) |
| 3125 | return -EFAULT; |
| 3126 | } |
| 3127 | } |
| 3128 | |
| 3129 | return 0; |
| 3130 | } |
| 3131 | |
| 3132 | static int compat_siocwandev(struct net *net, struct compat_ifreq __user *uifr32) |
| 3133 | { |
| 3134 | compat_uptr_t uptr32; |
| 3135 | struct ifreq ifr; |
| 3136 | void __user *saved; |
| 3137 | int err; |
| 3138 | |
| 3139 | if (copy_from_user(&ifr, uifr32, sizeof(struct compat_ifreq))) |
| 3140 | return -EFAULT; |
| 3141 | |
| 3142 | if (get_user(uptr32, &uifr32->ifr_settings.ifs_ifsu)) |
| 3143 | return -EFAULT; |
| 3144 | |
| 3145 | saved = ifr.ifr_settings.ifs_ifsu.raw_hdlc; |
| 3146 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = compat_ptr(uptr32); |
| 3147 | |
| 3148 | err = dev_ioctl(net, SIOCWANDEV, &ifr, NULL); |
| 3149 | if (!err) { |
| 3150 | ifr.ifr_settings.ifs_ifsu.raw_hdlc = saved; |
| 3151 | if (copy_to_user(uifr32, &ifr, sizeof(struct compat_ifreq))) |
| 3152 | err = -EFAULT; |
| 3153 | } |
| 3154 | return err; |
| 3155 | } |
| 3156 | |
| 3157 | /* Handle ioctls that use ifreq::ifr_data and just need struct ifreq converted */ |
| 3158 | static int compat_ifr_data_ioctl(struct net *net, unsigned int cmd, |
| 3159 | struct compat_ifreq __user *u_ifreq32) |
| 3160 | { |
| 3161 | struct ifreq ifreq; |
| 3162 | u32 data32; |
| 3163 | |
| 3164 | if (copy_from_user(ifreq.ifr_name, u_ifreq32->ifr_name, IFNAMSIZ)) |
| 3165 | return -EFAULT; |
| 3166 | if (get_user(data32, &u_ifreq32->ifr_data)) |
| 3167 | return -EFAULT; |
| 3168 | ifreq.ifr_data = compat_ptr(data32); |
| 3169 | |
| 3170 | return dev_ioctl(net, cmd, &ifreq, NULL); |
| 3171 | } |
| 3172 | |
| 3173 | static int compat_ifreq_ioctl(struct net *net, struct socket *sock, |
| 3174 | unsigned int cmd, |
| 3175 | struct compat_ifreq __user *uifr32) |
| 3176 | { |
| 3177 | struct ifreq __user *uifr; |
| 3178 | int err; |
| 3179 | |
| 3180 | /* Handle the fact that while struct ifreq has the same *layout* on |
| 3181 | * 32/64 for everything but ifreq::ifru_ifmap and ifreq::ifru_data, |
| 3182 | * which are handled elsewhere, it still has different *size* due to |
| 3183 | * ifreq::ifru_ifmap (which is 16 bytes on 32 bit, 24 bytes on 64-bit, |
| 3184 | * resulting in struct ifreq being 32 and 40 bytes respectively). |
| 3185 | * As a result, if the struct happens to be at the end of a page and |
| 3186 | * the next page isn't readable/writable, we get a fault. To prevent |
| 3187 | * that, copy back and forth to the full size. |
| 3188 | */ |
| 3189 | |
| 3190 | uifr = compat_alloc_user_space(sizeof(*uifr)); |
| 3191 | if (copy_in_user(uifr, uifr32, sizeof(*uifr32))) |
| 3192 | return -EFAULT; |
| 3193 | |
| 3194 | err = sock_do_ioctl(net, sock, cmd, (unsigned long)uifr); |
| 3195 | |
| 3196 | if (!err) { |
| 3197 | switch (cmd) { |
| 3198 | case SIOCGIFFLAGS: |
| 3199 | case SIOCGIFMETRIC: |
| 3200 | case SIOCGIFMTU: |
| 3201 | case SIOCGIFMEM: |
| 3202 | case SIOCGIFHWADDR: |
| 3203 | case SIOCGIFINDEX: |
| 3204 | case SIOCGIFADDR: |
| 3205 | case SIOCGIFBRDADDR: |
| 3206 | case SIOCGIFDSTADDR: |
| 3207 | case SIOCGIFNETMASK: |
| 3208 | case SIOCGIFPFLAGS: |
| 3209 | case SIOCGIFTXQLEN: |
| 3210 | case SIOCGMIIPHY: |
| 3211 | case SIOCGMIIREG: |
| 3212 | case SIOCGIFNAME: |
| 3213 | if (copy_in_user(uifr32, uifr, sizeof(*uifr32))) |
| 3214 | err = -EFAULT; |
| 3215 | break; |
| 3216 | } |
| 3217 | } |
| 3218 | return err; |
| 3219 | } |
| 3220 | |
| 3221 | static int compat_sioc_ifmap(struct net *net, unsigned int cmd, |
| 3222 | struct compat_ifreq __user *uifr32) |
| 3223 | { |
| 3224 | struct ifreq ifr; |
| 3225 | struct compat_ifmap __user *uifmap32; |
| 3226 | int err; |
| 3227 | |
| 3228 | uifmap32 = &uifr32->ifr_ifru.ifru_map; |
| 3229 | err = copy_from_user(&ifr, uifr32, sizeof(ifr.ifr_name)); |
| 3230 | err |= get_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
| 3231 | err |= get_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
| 3232 | err |= get_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
| 3233 | err |= get_user(ifr.ifr_map.irq, &uifmap32->irq); |
| 3234 | err |= get_user(ifr.ifr_map.dma, &uifmap32->dma); |
| 3235 | err |= get_user(ifr.ifr_map.port, &uifmap32->port); |
| 3236 | if (err) |
| 3237 | return -EFAULT; |
| 3238 | |
| 3239 | err = dev_ioctl(net, cmd, &ifr, NULL); |
| 3240 | |
| 3241 | if (cmd == SIOCGIFMAP && !err) { |
| 3242 | err = copy_to_user(uifr32, &ifr, sizeof(ifr.ifr_name)); |
| 3243 | err |= put_user(ifr.ifr_map.mem_start, &uifmap32->mem_start); |
| 3244 | err |= put_user(ifr.ifr_map.mem_end, &uifmap32->mem_end); |
| 3245 | err |= put_user(ifr.ifr_map.base_addr, &uifmap32->base_addr); |
| 3246 | err |= put_user(ifr.ifr_map.irq, &uifmap32->irq); |
| 3247 | err |= put_user(ifr.ifr_map.dma, &uifmap32->dma); |
| 3248 | err |= put_user(ifr.ifr_map.port, &uifmap32->port); |
| 3249 | if (err) |
| 3250 | err = -EFAULT; |
| 3251 | } |
| 3252 | return err; |
| 3253 | } |
| 3254 | |
| 3255 | struct rtentry32 { |
| 3256 | u32 rt_pad1; |
| 3257 | struct sockaddr rt_dst; /* target address */ |
| 3258 | struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */ |
| 3259 | struct sockaddr rt_genmask; /* target network mask (IP) */ |
| 3260 | unsigned short rt_flags; |
| 3261 | short rt_pad2; |
| 3262 | u32 rt_pad3; |
| 3263 | unsigned char rt_tos; |
| 3264 | unsigned char rt_class; |
| 3265 | short rt_pad4; |
| 3266 | short rt_metric; /* +1 for binary compatibility! */ |
| 3267 | /* char * */ u32 rt_dev; /* forcing the device at add */ |
| 3268 | u32 rt_mtu; /* per route MTU/Window */ |
| 3269 | u32 rt_window; /* Window clamping */ |
| 3270 | unsigned short rt_irtt; /* Initial RTT */ |
| 3271 | }; |
| 3272 | |
| 3273 | struct in6_rtmsg32 { |
| 3274 | struct in6_addr rtmsg_dst; |
| 3275 | struct in6_addr rtmsg_src; |
| 3276 | struct in6_addr rtmsg_gateway; |
| 3277 | u32 rtmsg_type; |
| 3278 | u16 rtmsg_dst_len; |
| 3279 | u16 rtmsg_src_len; |
| 3280 | u32 rtmsg_metric; |
| 3281 | u32 rtmsg_info; |
| 3282 | u32 rtmsg_flags; |
| 3283 | s32 rtmsg_ifindex; |
| 3284 | }; |
| 3285 | |
| 3286 | static int routing_ioctl(struct net *net, struct socket *sock, |
| 3287 | unsigned int cmd, void __user *argp) |
| 3288 | { |
| 3289 | int ret; |
| 3290 | void *r = NULL; |
| 3291 | struct in6_rtmsg r6; |
| 3292 | struct rtentry r4; |
| 3293 | char devname[16]; |
| 3294 | u32 rtdev; |
| 3295 | mm_segment_t old_fs = get_fs(); |
| 3296 | |
| 3297 | if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */ |
| 3298 | struct in6_rtmsg32 __user *ur6 = argp; |
| 3299 | ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst), |
| 3300 | 3 * sizeof(struct in6_addr)); |
| 3301 | ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type)); |
| 3302 | ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len)); |
| 3303 | ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len)); |
| 3304 | ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric)); |
| 3305 | ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info)); |
| 3306 | ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags)); |
| 3307 | ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex)); |
| 3308 | |
| 3309 | r = (void *) &r6; |
| 3310 | } else { /* ipv4 */ |
| 3311 | struct rtentry32 __user *ur4 = argp; |
| 3312 | ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst), |
| 3313 | 3 * sizeof(struct sockaddr)); |
| 3314 | ret |= get_user(r4.rt_flags, &(ur4->rt_flags)); |
| 3315 | ret |= get_user(r4.rt_metric, &(ur4->rt_metric)); |
| 3316 | ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu)); |
| 3317 | ret |= get_user(r4.rt_window, &(ur4->rt_window)); |
| 3318 | ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt)); |
| 3319 | ret |= get_user(rtdev, &(ur4->rt_dev)); |
| 3320 | if (rtdev) { |
| 3321 | ret |= copy_from_user(devname, compat_ptr(rtdev), 15); |
| 3322 | r4.rt_dev = (char __user __force *)devname; |
| 3323 | devname[15] = 0; |
| 3324 | } else |
| 3325 | r4.rt_dev = NULL; |
| 3326 | |
| 3327 | r = (void *) &r4; |
| 3328 | } |
| 3329 | |
| 3330 | if (ret) { |
| 3331 | ret = -EFAULT; |
| 3332 | goto out; |
| 3333 | } |
| 3334 | |
| 3335 | set_fs(KERNEL_DS); |
| 3336 | ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r); |
| 3337 | set_fs(old_fs); |
| 3338 | |
| 3339 | out: |
| 3340 | return ret; |
| 3341 | } |
| 3342 | |
| 3343 | /* Since old style bridge ioctl's endup using SIOCDEVPRIVATE |
| 3344 | * for some operations; this forces use of the newer bridge-utils that |
| 3345 | * use compatible ioctls |
| 3346 | */ |
| 3347 | static int old_bridge_ioctl(compat_ulong_t __user *argp) |
| 3348 | { |
| 3349 | compat_ulong_t tmp; |
| 3350 | |
| 3351 | if (get_user(tmp, argp)) |
| 3352 | return -EFAULT; |
| 3353 | if (tmp == BRCTL_GET_VERSION) |
| 3354 | return BRCTL_VERSION + 1; |
| 3355 | return -EINVAL; |
| 3356 | } |
| 3357 | |
| 3358 | static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, |
| 3359 | unsigned int cmd, unsigned long arg) |
| 3360 | { |
| 3361 | void __user *argp = compat_ptr(arg); |
| 3362 | struct sock *sk = sock->sk; |
| 3363 | struct net *net = sock_net(sk); |
| 3364 | |
| 3365 | if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) |
| 3366 | return compat_ifr_data_ioctl(net, cmd, argp); |
| 3367 | |
| 3368 | switch (cmd) { |
| 3369 | case SIOCSIFBR: |
| 3370 | case SIOCGIFBR: |
| 3371 | return old_bridge_ioctl(argp); |
| 3372 | case SIOCGIFCONF: |
| 3373 | return compat_dev_ifconf(net, argp); |
| 3374 | case SIOCETHTOOL: |
| 3375 | return ethtool_ioctl(net, argp); |
| 3376 | case SIOCWANDEV: |
| 3377 | return compat_siocwandev(net, argp); |
| 3378 | case SIOCGIFMAP: |
| 3379 | case SIOCSIFMAP: |
| 3380 | return compat_sioc_ifmap(net, cmd, argp); |
| 3381 | case SIOCADDRT: |
| 3382 | case SIOCDELRT: |
| 3383 | return routing_ioctl(net, sock, cmd, argp); |
| 3384 | case SIOCGSTAMP_OLD: |
| 3385 | case SIOCGSTAMPNS_OLD: |
| 3386 | if (!sock->ops->gettstamp) |
| 3387 | return -ENOIOCTLCMD; |
| 3388 | return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, |
| 3389 | !COMPAT_USE_64BIT_TIME); |
| 3390 | |
| 3391 | case SIOCBONDSLAVEINFOQUERY: |
| 3392 | case SIOCBONDINFOQUERY: |
| 3393 | case SIOCSHWTSTAMP: |
| 3394 | case SIOCGHWTSTAMP: |
| 3395 | return compat_ifr_data_ioctl(net, cmd, argp); |
| 3396 | |
| 3397 | case FIOSETOWN: |
| 3398 | case SIOCSPGRP: |
| 3399 | case FIOGETOWN: |
| 3400 | case SIOCGPGRP: |
| 3401 | case SIOCBRADDBR: |
| 3402 | case SIOCBRDELBR: |
| 3403 | case SIOCGIFVLAN: |
| 3404 | case SIOCSIFVLAN: |
| 3405 | case SIOCADDDLCI: |
| 3406 | case SIOCDELDLCI: |
| 3407 | case SIOCGSKNS: |
| 3408 | case SIOCGSTAMP_NEW: |
| 3409 | case SIOCGSTAMPNS_NEW: |
| 3410 | return sock_ioctl(file, cmd, arg); |
| 3411 | |
| 3412 | case SIOCGIFFLAGS: |
| 3413 | case SIOCSIFFLAGS: |
| 3414 | case SIOCGIFMETRIC: |
| 3415 | case SIOCSIFMETRIC: |
| 3416 | case SIOCGIFMTU: |
| 3417 | case SIOCSIFMTU: |
| 3418 | case SIOCGIFMEM: |
| 3419 | case SIOCSIFMEM: |
| 3420 | case SIOCGIFHWADDR: |
| 3421 | case SIOCSIFHWADDR: |
| 3422 | case SIOCADDMULTI: |
| 3423 | case SIOCDELMULTI: |
| 3424 | case SIOCGIFINDEX: |
| 3425 | case SIOCGIFADDR: |
| 3426 | case SIOCSIFADDR: |
| 3427 | case SIOCSIFHWBROADCAST: |
| 3428 | case SIOCDIFADDR: |
| 3429 | case SIOCGIFBRDADDR: |
| 3430 | case SIOCSIFBRDADDR: |
| 3431 | case SIOCGIFDSTADDR: |
| 3432 | case SIOCSIFDSTADDR: |
| 3433 | case SIOCGIFNETMASK: |
| 3434 | case SIOCSIFNETMASK: |
| 3435 | case SIOCSIFPFLAGS: |
| 3436 | case SIOCGIFPFLAGS: |
| 3437 | case SIOCGIFTXQLEN: |
| 3438 | case SIOCSIFTXQLEN: |
| 3439 | case SIOCBRADDIF: |
| 3440 | case SIOCBRDELIF: |
| 3441 | case SIOCGIFNAME: |
| 3442 | case SIOCSIFNAME: |
| 3443 | case SIOCGMIIPHY: |
| 3444 | case SIOCGMIIREG: |
| 3445 | case SIOCSMIIREG: |
| 3446 | case SIOCBONDENSLAVE: |
| 3447 | case SIOCBONDRELEASE: |
| 3448 | case SIOCBONDSETHWADDR: |
| 3449 | case SIOCBONDCHANGEACTIVE: |
| 3450 | return compat_ifreq_ioctl(net, sock, cmd, argp); |
| 3451 | |
| 3452 | case SIOCSARP: |
| 3453 | case SIOCGARP: |
| 3454 | case SIOCDARP: |
| 3455 | case SIOCATMARK: |
| 3456 | return sock_do_ioctl(net, sock, cmd, arg); |
| 3457 | } |
| 3458 | |
| 3459 | return -ENOIOCTLCMD; |
| 3460 | } |
| 3461 | |
| 3462 | static long compat_sock_ioctl(struct file *file, unsigned int cmd, |
| 3463 | unsigned long arg) |
| 3464 | { |
| 3465 | struct socket *sock = file->private_data; |
| 3466 | int ret = -ENOIOCTLCMD; |
| 3467 | struct sock *sk; |
| 3468 | struct net *net; |
| 3469 | |
| 3470 | sk = sock->sk; |
| 3471 | net = sock_net(sk); |
| 3472 | |
| 3473 | if (sock->ops->compat_ioctl) |
| 3474 | ret = sock->ops->compat_ioctl(sock, cmd, arg); |
| 3475 | |
| 3476 | if (ret == -ENOIOCTLCMD && |
| 3477 | (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)) |
| 3478 | ret = compat_wext_handle_ioctl(net, cmd, arg); |
| 3479 | |
| 3480 | if (ret == -ENOIOCTLCMD) |
| 3481 | ret = compat_sock_ioctl_trans(file, sock, cmd, arg); |
| 3482 | |
| 3483 | return ret; |
| 3484 | } |
| 3485 | #endif |
| 3486 | |
| 3487 | /** |
| 3488 | * kernel_bind - bind an address to a socket (kernel space) |
| 3489 | * @sock: socket |
| 3490 | * @addr: address |
| 3491 | * @addrlen: length of address |
| 3492 | * |
| 3493 | * Returns 0 or an error. |
| 3494 | */ |
| 3495 | |
| 3496 | int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen) |
| 3497 | { |
| 3498 | return sock->ops->bind(sock, addr, addrlen); |
| 3499 | } |
| 3500 | EXPORT_SYMBOL(kernel_bind); |
| 3501 | |
| 3502 | /** |
| 3503 | * kernel_listen - move socket to listening state (kernel space) |
| 3504 | * @sock: socket |
| 3505 | * @backlog: pending connections queue size |
| 3506 | * |
| 3507 | * Returns 0 or an error. |
| 3508 | */ |
| 3509 | |
| 3510 | int kernel_listen(struct socket *sock, int backlog) |
| 3511 | { |
| 3512 | return sock->ops->listen(sock, backlog); |
| 3513 | } |
| 3514 | EXPORT_SYMBOL(kernel_listen); |
| 3515 | |
| 3516 | /** |
| 3517 | * kernel_accept - accept a connection (kernel space) |
| 3518 | * @sock: listening socket |
| 3519 | * @newsock: new connected socket |
| 3520 | * @flags: flags |
| 3521 | * |
| 3522 | * @flags must be SOCK_CLOEXEC, SOCK_NONBLOCK or 0. |
| 3523 | * If it fails, @newsock is guaranteed to be %NULL. |
| 3524 | * Returns 0 or an error. |
| 3525 | */ |
| 3526 | |
| 3527 | int kernel_accept(struct socket *sock, struct socket **newsock, int flags) |
| 3528 | { |
| 3529 | struct sock *sk = sock->sk; |
| 3530 | int err; |
| 3531 | |
| 3532 | err = sock_create_lite(sk->sk_family, sk->sk_type, sk->sk_protocol, |
| 3533 | newsock); |
| 3534 | if (err < 0) |
| 3535 | goto done; |
| 3536 | |
| 3537 | err = sock->ops->accept(sock, *newsock, flags, true); |
| 3538 | if (err < 0) { |
| 3539 | sock_release(*newsock); |
| 3540 | *newsock = NULL; |
| 3541 | goto done; |
| 3542 | } |
| 3543 | |
| 3544 | (*newsock)->ops = sock->ops; |
| 3545 | __module_get((*newsock)->ops->owner); |
| 3546 | |
| 3547 | done: |
| 3548 | return err; |
| 3549 | } |
| 3550 | EXPORT_SYMBOL(kernel_accept); |
| 3551 | |
| 3552 | /** |
| 3553 | * kernel_connect - connect a socket (kernel space) |
| 3554 | * @sock: socket |
| 3555 | * @addr: address |
| 3556 | * @addrlen: address length |
| 3557 | * @flags: flags (O_NONBLOCK, ...) |
| 3558 | * |
| 3559 | * For datagram sockets, @addr is the addres to which datagrams are sent |
| 3560 | * by default, and the only address from which datagrams are received. |
| 3561 | * For stream sockets, attempts to connect to @addr. |
| 3562 | * Returns 0 or an error code. |
| 3563 | */ |
| 3564 | |
| 3565 | int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen, |
| 3566 | int flags) |
| 3567 | { |
| 3568 | return sock->ops->connect(sock, addr, addrlen, flags); |
| 3569 | } |
| 3570 | EXPORT_SYMBOL(kernel_connect); |
| 3571 | |
| 3572 | /** |
| 3573 | * kernel_getsockname - get the address which the socket is bound (kernel space) |
| 3574 | * @sock: socket |
| 3575 | * @addr: address holder |
| 3576 | * |
| 3577 | * Fills the @addr pointer with the address which the socket is bound. |
| 3578 | * Returns 0 or an error code. |
| 3579 | */ |
| 3580 | |
| 3581 | int kernel_getsockname(struct socket *sock, struct sockaddr *addr) |
| 3582 | { |
| 3583 | return sock->ops->getname(sock, addr, 0); |
| 3584 | } |
| 3585 | EXPORT_SYMBOL(kernel_getsockname); |
| 3586 | |
| 3587 | /** |
| 3588 | * kernel_peername - get the address which the socket is connected (kernel space) |
| 3589 | * @sock: socket |
| 3590 | * @addr: address holder |
| 3591 | * |
| 3592 | * Fills the @addr pointer with the address which the socket is connected. |
| 3593 | * Returns 0 or an error code. |
| 3594 | */ |
| 3595 | |
| 3596 | int kernel_getpeername(struct socket *sock, struct sockaddr *addr) |
| 3597 | { |
| 3598 | return sock->ops->getname(sock, addr, 1); |
| 3599 | } |
| 3600 | EXPORT_SYMBOL(kernel_getpeername); |
| 3601 | |
| 3602 | /** |
| 3603 | * kernel_getsockopt - get a socket option (kernel space) |
| 3604 | * @sock: socket |
| 3605 | * @level: API level (SOL_SOCKET, ...) |
| 3606 | * @optname: option tag |
| 3607 | * @optval: option value |
| 3608 | * @optlen: option length |
| 3609 | * |
| 3610 | * Assigns the option length to @optlen. |
| 3611 | * Returns 0 or an error. |
| 3612 | */ |
| 3613 | |
| 3614 | int kernel_getsockopt(struct socket *sock, int level, int optname, |
| 3615 | char *optval, int *optlen) |
| 3616 | { |
| 3617 | mm_segment_t oldfs = get_fs(); |
| 3618 | char __user *uoptval; |
| 3619 | int __user *uoptlen; |
| 3620 | int err; |
| 3621 | |
| 3622 | uoptval = (char __user __force *) optval; |
| 3623 | uoptlen = (int __user __force *) optlen; |
| 3624 | |
| 3625 | set_fs(KERNEL_DS); |
| 3626 | if (level == SOL_SOCKET) |
| 3627 | err = sock_getsockopt(sock, level, optname, uoptval, uoptlen); |
| 3628 | else |
| 3629 | err = sock->ops->getsockopt(sock, level, optname, uoptval, |
| 3630 | uoptlen); |
| 3631 | set_fs(oldfs); |
| 3632 | return err; |
| 3633 | } |
| 3634 | EXPORT_SYMBOL(kernel_getsockopt); |
| 3635 | |
| 3636 | /** |
| 3637 | * kernel_setsockopt - set a socket option (kernel space) |
| 3638 | * @sock: socket |
| 3639 | * @level: API level (SOL_SOCKET, ...) |
| 3640 | * @optname: option tag |
| 3641 | * @optval: option value |
| 3642 | * @optlen: option length |
| 3643 | * |
| 3644 | * Returns 0 or an error. |
| 3645 | */ |
| 3646 | |
| 3647 | int kernel_setsockopt(struct socket *sock, int level, int optname, |
| 3648 | char *optval, unsigned int optlen) |
| 3649 | { |
| 3650 | mm_segment_t oldfs = get_fs(); |
| 3651 | char __user *uoptval; |
| 3652 | int err; |
| 3653 | |
| 3654 | uoptval = (char __user __force *) optval; |
| 3655 | |
| 3656 | set_fs(KERNEL_DS); |
| 3657 | if (level == SOL_SOCKET) |
| 3658 | err = sock_setsockopt(sock, level, optname, uoptval, optlen); |
| 3659 | else |
| 3660 | err = sock->ops->setsockopt(sock, level, optname, uoptval, |
| 3661 | optlen); |
| 3662 | set_fs(oldfs); |
| 3663 | return err; |
| 3664 | } |
| 3665 | EXPORT_SYMBOL(kernel_setsockopt); |
| 3666 | |
| 3667 | /** |
| 3668 | * kernel_sendpage - send a &page through a socket (kernel space) |
| 3669 | * @sock: socket |
| 3670 | * @page: page |
| 3671 | * @offset: page offset |
| 3672 | * @size: total size in bytes |
| 3673 | * @flags: flags (MSG_DONTWAIT, ...) |
| 3674 | * |
| 3675 | * Returns the total amount sent in bytes or an error. |
| 3676 | */ |
| 3677 | |
| 3678 | int kernel_sendpage(struct socket *sock, struct page *page, int offset, |
| 3679 | size_t size, int flags) |
| 3680 | { |
| 3681 | if (sock->ops->sendpage) |
| 3682 | return sock->ops->sendpage(sock, page, offset, size, flags); |
| 3683 | |
| 3684 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 3685 | } |
| 3686 | EXPORT_SYMBOL(kernel_sendpage); |
| 3687 | |
| 3688 | /** |
| 3689 | * kernel_sendpage_locked - send a &page through the locked sock (kernel space) |
| 3690 | * @sk: sock |
| 3691 | * @page: page |
| 3692 | * @offset: page offset |
| 3693 | * @size: total size in bytes |
| 3694 | * @flags: flags (MSG_DONTWAIT, ...) |
| 3695 | * |
| 3696 | * Returns the total amount sent in bytes or an error. |
| 3697 | * Caller must hold @sk. |
| 3698 | */ |
| 3699 | |
| 3700 | int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset, |
| 3701 | size_t size, int flags) |
| 3702 | { |
| 3703 | struct socket *sock = sk->sk_socket; |
| 3704 | |
| 3705 | if (sock->ops->sendpage_locked) |
| 3706 | return sock->ops->sendpage_locked(sk, page, offset, size, |
| 3707 | flags); |
| 3708 | |
| 3709 | return sock_no_sendpage_locked(sk, page, offset, size, flags); |
| 3710 | } |
| 3711 | EXPORT_SYMBOL(kernel_sendpage_locked); |
| 3712 | |
| 3713 | /** |
| 3714 | * kernel_shutdown - shut down part of a full-duplex connection (kernel space) |
| 3715 | * @sock: socket |
| 3716 | * @how: connection part |
| 3717 | * |
| 3718 | * Returns 0 or an error. |
| 3719 | */ |
| 3720 | |
| 3721 | int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how) |
| 3722 | { |
| 3723 | return sock->ops->shutdown(sock, how); |
| 3724 | } |
| 3725 | EXPORT_SYMBOL(kernel_sock_shutdown); |
| 3726 | |
| 3727 | /** |
| 3728 | * kernel_sock_ip_overhead - returns the IP overhead imposed by a socket |
| 3729 | * @sk: socket |
| 3730 | * |
| 3731 | * This routine returns the IP overhead imposed by a socket i.e. |
| 3732 | * the length of the underlying IP header, depending on whether |
| 3733 | * this is an IPv4 or IPv6 socket and the length from IP options turned |
| 3734 | * on at the socket. Assumes that the caller has a lock on the socket. |
| 3735 | */ |
| 3736 | |
| 3737 | u32 kernel_sock_ip_overhead(struct sock *sk) |
| 3738 | { |
| 3739 | struct inet_sock *inet; |
| 3740 | struct ip_options_rcu *opt; |
| 3741 | u32 overhead = 0; |
| 3742 | #if IS_ENABLED(CONFIG_IPV6) |
| 3743 | struct ipv6_pinfo *np; |
| 3744 | struct ipv6_txoptions *optv6 = NULL; |
| 3745 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
| 3746 | |
| 3747 | if (!sk) |
| 3748 | return overhead; |
| 3749 | |
| 3750 | switch (sk->sk_family) { |
| 3751 | case AF_INET: |
| 3752 | inet = inet_sk(sk); |
| 3753 | overhead += sizeof(struct iphdr); |
| 3754 | opt = rcu_dereference_protected(inet->inet_opt, |
| 3755 | sock_owned_by_user(sk)); |
| 3756 | if (opt) |
| 3757 | overhead += opt->opt.optlen; |
| 3758 | return overhead; |
| 3759 | #if IS_ENABLED(CONFIG_IPV6) |
| 3760 | case AF_INET6: |
| 3761 | np = inet6_sk(sk); |
| 3762 | overhead += sizeof(struct ipv6hdr); |
| 3763 | if (np) |
| 3764 | optv6 = rcu_dereference_protected(np->opt, |
| 3765 | sock_owned_by_user(sk)); |
| 3766 | if (optv6) |
| 3767 | overhead += (optv6->opt_flen + optv6->opt_nflen); |
| 3768 | return overhead; |
| 3769 | #endif /* IS_ENABLED(CONFIG_IPV6) */ |
| 3770 | default: /* Returns 0 overhead if the socket is not ipv4 or ipv6 */ |
| 3771 | return overhead; |
| 3772 | } |
| 3773 | } |
| 3774 | EXPORT_SYMBOL(kernel_sock_ip_overhead); |