1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * Generic socket support routines. Memory allocators, socket lock/release 8 * handler for protocols to use and generic option handler. 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Florian La Roche, <flla@stud.uni-sb.de> 13 * Alan Cox, <A.Cox@swansea.ac.uk> 14 * 15 * Fixes: 16 * Alan Cox : Numerous verify_area() problems 17 * Alan Cox : Connecting on a connecting socket 18 * now returns an error for tcp. 19 * Alan Cox : sock->protocol is set correctly. 20 * and is not sometimes left as 0. 21 * Alan Cox : connect handles icmp errors on a 22 * connect properly. Unfortunately there 23 * is a restart syscall nasty there. I 24 * can't match BSD without hacking the C 25 * library. Ideas urgently sought! 26 * Alan Cox : Disallow bind() to addresses that are 27 * not ours - especially broadcast ones!! 28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 30 * instead they leave that for the DESTROY timer. 31 * Alan Cox : Clean up error flag in accept 32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 33 * was buggy. Put a remove_sock() in the handler 34 * for memory when we hit 0. Also altered the timer 35 * code. The ACK stuff can wait and needs major 36 * TCP layer surgery. 37 * Alan Cox : Fixed TCP ack bug, removed remove sock 38 * and fixed timer/inet_bh race. 39 * Alan Cox : Added zapped flag for TCP 40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 45 * Rick Sladkey : Relaxed UDP rules for matching packets. 46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 47 * Pauline Middelink : identd support 48 * Alan Cox : Fixed connect() taking signals I think. 49 * Alan Cox : SO_LINGER supported 50 * Alan Cox : Error reporting fixes 51 * Anonymous : inet_create tidied up (sk->reuse setting) 52 * Alan Cox : inet sockets don't set sk->type! 53 * Alan Cox : Split socket option code 54 * Alan Cox : Callbacks 55 * Alan Cox : Nagle flag for Charles & Johannes stuff 56 * Alex : Removed restriction on inet fioctl 57 * Alan Cox : Splitting INET from NET core 58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 60 * Alan Cox : Split IP from generic code 61 * Alan Cox : New kfree_skbmem() 62 * Alan Cox : Make SO_DEBUG superuser only. 63 * Alan Cox : Allow anyone to clear SO_DEBUG 64 * (compatibility fix) 65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 66 * Alan Cox : Allocator for a socket is settable. 67 * Alan Cox : SO_ERROR includes soft errors. 68 * Alan Cox : Allow NULL arguments on some SO_ opts 69 * Alan Cox : Generic socket allocation to make hooks 70 * easier (suggested by Craig Metz). 71 * Michael Pall : SO_ERROR returns positive errno again 72 * Steve Whitehouse: Added default destructor to free 73 * protocol private data. 74 * Steve Whitehouse: Added various other default routines 75 * common to several socket families. 76 * Chris Evans : Call suser() check last on F_SETOWN 77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 79 * Andi Kleen : Fix write_space callback 80 * Chris Evans : Security fixes - signedness again 81 * Arnaldo C. Melo : cleanups, use skb_queue_purge 82 * 83 * To Fix: 84 */ 85 86 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 87 88 #include <asm/unaligned.h> 89 #include <linux/capability.h> 90 #include <linux/errno.h> 91 #include <linux/errqueue.h> 92 #include <linux/types.h> 93 #include <linux/socket.h> 94 #include <linux/in.h> 95 #include <linux/kernel.h> 96 #include <linux/module.h> 97 #include <linux/proc_fs.h> 98 #include <linux/seq_file.h> 99 #include <linux/sched.h> 100 #include <linux/sched/mm.h> 101 #include <linux/timer.h> 102 #include <linux/string.h> 103 #include <linux/sockios.h> 104 #include <linux/net.h> 105 #include <linux/mm.h> 106 #include <linux/slab.h> 107 #include <linux/interrupt.h> 108 #include <linux/poll.h> 109 #include <linux/tcp.h> 110 #include <linux/init.h> 111 #include <linux/highmem.h> 112 #include <linux/user_namespace.h> 113 #include <linux/static_key.h> 114 #include <linux/memcontrol.h> 115 #include <linux/prefetch.h> 116 117 #include <linux/uaccess.h> 118 119 #include <linux/netdevice.h> 120 #include <net/protocol.h> 121 #include <linux/skbuff.h> 122 #include <net/net_namespace.h> 123 #include <net/request_sock.h> 124 #include <net/sock.h> 125 #include <linux/net_tstamp.h> 126 #include <net/xfrm.h> 127 #include <linux/ipsec.h> 128 #include <net/cls_cgroup.h> 129 #include <net/netprio_cgroup.h> 130 #include <linux/sock_diag.h> 131 132 #include <linux/filter.h> 133 #include <net/sock_reuseport.h> 134 #include <net/bpf_sk_storage.h> 135 136 #include <trace/events/sock.h> 137 138 #include <net/tcp.h> 139 #include <net/busy_poll.h> 140 141 static DEFINE_MUTEX(proto_list_mutex); 142 static LIST_HEAD(proto_list); 143 144 static void sock_inuse_add(struct net *net, int val); 145 146 /** 147 * sk_ns_capable - General socket capability test 148 * @sk: Socket to use a capability on or through 149 * @user_ns: The user namespace of the capability to use 150 * @cap: The capability to use 151 * 152 * Test to see if the opener of the socket had when the socket was 153 * created and the current process has the capability @cap in the user 154 * namespace @user_ns. 155 */ 156 bool sk_ns_capable(const struct sock *sk, 157 struct user_namespace *user_ns, int cap) 158 { 159 return file_ns_capable(sk->sk_socket->file, user_ns, cap) && 160 ns_capable(user_ns, cap); 161 } 162 EXPORT_SYMBOL(sk_ns_capable); 163 164 /** 165 * sk_capable - Socket global capability test 166 * @sk: Socket to use a capability on or through 167 * @cap: The global capability to use 168 * 169 * Test to see if the opener of the socket had when the socket was 170 * created and the current process has the capability @cap in all user 171 * namespaces. 172 */ 173 bool sk_capable(const struct sock *sk, int cap) 174 { 175 return sk_ns_capable(sk, &init_user_ns, cap); 176 } 177 EXPORT_SYMBOL(sk_capable); 178 179 /** 180 * sk_net_capable - Network namespace socket capability test 181 * @sk: Socket to use a capability on or through 182 * @cap: The capability to use 183 * 184 * Test to see if the opener of the socket had when the socket was created 185 * and the current process has the capability @cap over the network namespace 186 * the socket is a member of. 187 */ 188 bool sk_net_capable(const struct sock *sk, int cap) 189 { 190 return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); 191 } 192 EXPORT_SYMBOL(sk_net_capable); 193 194 /* 195 * Each address family might have different locking rules, so we have 196 * one slock key per address family and separate keys for internal and 197 * userspace sockets. 198 */ 199 static struct lock_class_key af_family_keys[AF_MAX]; 200 static struct lock_class_key af_family_kern_keys[AF_MAX]; 201 static struct lock_class_key af_family_slock_keys[AF_MAX]; 202 static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; 203 204 /* 205 * Make lock validator output more readable. (we pre-construct these 206 * strings build-time, so that runtime initialization of socket 207 * locks is fast): 208 */ 209 210 #define _sock_locks(x) \ 211 x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ 212 x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ 213 x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ 214 x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ 215 x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ 216 x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ 217 x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ 218 x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ 219 x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ 220 x "27" , x "28" , x "AF_CAN" , \ 221 x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ 222 x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ 223 x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ 224 x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ 225 x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \ 226 x "AF_MAX" 227 228 static const char *const af_family_key_strings[AF_MAX+1] = { 229 _sock_locks("sk_lock-") 230 }; 231 static const char *const af_family_slock_key_strings[AF_MAX+1] = { 232 _sock_locks("slock-") 233 }; 234 static const char *const af_family_clock_key_strings[AF_MAX+1] = { 235 _sock_locks("clock-") 236 }; 237 238 static const char *const af_family_kern_key_strings[AF_MAX+1] = { 239 _sock_locks("k-sk_lock-") 240 }; 241 static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { 242 _sock_locks("k-slock-") 243 }; 244 static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { 245 _sock_locks("k-clock-") 246 }; 247 static const char *const af_family_rlock_key_strings[AF_MAX+1] = { 248 _sock_locks("rlock-") 249 }; 250 static const char *const af_family_wlock_key_strings[AF_MAX+1] = { 251 _sock_locks("wlock-") 252 }; 253 static const char *const af_family_elock_key_strings[AF_MAX+1] = { 254 _sock_locks("elock-") 255 }; 256 257 /* 258 * sk_callback_lock and sk queues locking rules are per-address-family, 259 * so split the lock classes by using a per-AF key: 260 */ 261 static struct lock_class_key af_callback_keys[AF_MAX]; 262 static struct lock_class_key af_rlock_keys[AF_MAX]; 263 static struct lock_class_key af_wlock_keys[AF_MAX]; 264 static struct lock_class_key af_elock_keys[AF_MAX]; 265 static struct lock_class_key af_kern_callback_keys[AF_MAX]; 266 267 /* Run time adjustable parameters. */ 268 __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 269 EXPORT_SYMBOL(sysctl_wmem_max); 270 __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 271 EXPORT_SYMBOL(sysctl_rmem_max); 272 __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 273 __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 274 275 /* Maximal space eaten by iovec or ancillary data plus some space */ 276 int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 277 EXPORT_SYMBOL(sysctl_optmem_max); 278 279 int sysctl_tstamp_allow_data __read_mostly = 1; 280 281 DEFINE_STATIC_KEY_FALSE(memalloc_socks_key); 282 EXPORT_SYMBOL_GPL(memalloc_socks_key); 283 284 /** 285 * sk_set_memalloc - sets %SOCK_MEMALLOC 286 * @sk: socket to set it on 287 * 288 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. 289 * It's the responsibility of the admin to adjust min_free_kbytes 290 * to meet the requirements 291 */ 292 void sk_set_memalloc(struct sock *sk) 293 { 294 sock_set_flag(sk, SOCK_MEMALLOC); 295 sk->sk_allocation |= __GFP_MEMALLOC; 296 static_branch_inc(&memalloc_socks_key); 297 } 298 EXPORT_SYMBOL_GPL(sk_set_memalloc); 299 300 void sk_clear_memalloc(struct sock *sk) 301 { 302 sock_reset_flag(sk, SOCK_MEMALLOC); 303 sk->sk_allocation &= ~__GFP_MEMALLOC; 304 static_branch_dec(&memalloc_socks_key); 305 306 /* 307 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward 308 * progress of swapping. SOCK_MEMALLOC may be cleared while 309 * it has rmem allocations due to the last swapfile being deactivated 310 * but there is a risk that the socket is unusable due to exceeding 311 * the rmem limits. Reclaim the reserves and obey rmem limits again. 312 */ 313 sk_mem_reclaim(sk); 314 } 315 EXPORT_SYMBOL_GPL(sk_clear_memalloc); 316 317 int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 318 { 319 int ret; 320 unsigned int noreclaim_flag; 321 322 /* these should have been dropped before queueing */ 323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); 324 325 noreclaim_flag = memalloc_noreclaim_save(); 326 ret = sk->sk_backlog_rcv(sk, skb); 327 memalloc_noreclaim_restore(noreclaim_flag); 328 329 return ret; 330 } 331 EXPORT_SYMBOL(__sk_backlog_rcv); 332 333 static int sock_get_timeout(long timeo, void *optval, bool old_timeval) 334 { 335 struct __kernel_sock_timeval tv; 336 int size; 337 338 if (timeo == MAX_SCHEDULE_TIMEOUT) { 339 tv.tv_sec = 0; 340 tv.tv_usec = 0; 341 } else { 342 tv.tv_sec = timeo / HZ; 343 tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ; 344 } 345 346 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { 347 struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec }; 348 *(struct old_timeval32 *)optval = tv32; 349 return sizeof(tv32); 350 } 351 352 if (old_timeval) { 353 struct __kernel_old_timeval old_tv; 354 old_tv.tv_sec = tv.tv_sec; 355 old_tv.tv_usec = tv.tv_usec; 356 *(struct __kernel_old_timeval *)optval = old_tv; 357 size = sizeof(old_tv); 358 } else { 359 *(struct __kernel_sock_timeval *)optval = tv; 360 size = sizeof(tv); 361 } 362 363 return size; 364 } 365 366 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval) 367 { 368 struct __kernel_sock_timeval tv; 369 370 if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { 371 struct old_timeval32 tv32; 372 373 if (optlen < sizeof(tv32)) 374 return -EINVAL; 375 376 if (copy_from_user(&tv32, optval, sizeof(tv32))) 377 return -EFAULT; 378 tv.tv_sec = tv32.tv_sec; 379 tv.tv_usec = tv32.tv_usec; 380 } else if (old_timeval) { 381 struct __kernel_old_timeval old_tv; 382 383 if (optlen < sizeof(old_tv)) 384 return -EINVAL; 385 if (copy_from_user(&old_tv, optval, sizeof(old_tv))) 386 return -EFAULT; 387 tv.tv_sec = old_tv.tv_sec; 388 tv.tv_usec = old_tv.tv_usec; 389 } else { 390 if (optlen < sizeof(tv)) 391 return -EINVAL; 392 if (copy_from_user(&tv, optval, sizeof(tv))) 393 return -EFAULT; 394 } 395 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 396 return -EDOM; 397 398 if (tv.tv_sec < 0) { 399 static int warned __read_mostly; 400 401 *timeo_p = 0; 402 if (warned < 10 && net_ratelimit()) { 403 warned++; 404 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", 405 __func__, current->comm, task_pid_nr(current)); 406 } 407 return 0; 408 } 409 *timeo_p = MAX_SCHEDULE_TIMEOUT; 410 if (tv.tv_sec == 0 && tv.tv_usec == 0) 411 return 0; 412 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) 413 *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ); 414 return 0; 415 } 416 417 static void sock_warn_obsolete_bsdism(const char *name) 418 { 419 static int warned; 420 static char warncomm[TASK_COMM_LEN]; 421 if (strcmp(warncomm, current->comm) && warned < 5) { 422 strcpy(warncomm, current->comm); 423 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", 424 warncomm, name); 425 warned++; 426 } 427 } 428 429 static bool sock_needs_netstamp(const struct sock *sk) 430 { 431 switch (sk->sk_family) { 432 case AF_UNSPEC: 433 case AF_UNIX: 434 return false; 435 default: 436 return true; 437 } 438 } 439 440 static void sock_disable_timestamp(struct sock *sk, unsigned long flags) 441 { 442 if (sk->sk_flags & flags) { 443 sk->sk_flags &= ~flags; 444 if (sock_needs_netstamp(sk) && 445 !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) 446 net_disable_timestamp(); 447 } 448 } 449 450 451 int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 452 { 453 unsigned long flags; 454 struct sk_buff_head *list = &sk->sk_receive_queue; 455 456 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { 457 atomic_inc(&sk->sk_drops); 458 trace_sock_rcvqueue_full(sk, skb); 459 return -ENOMEM; 460 } 461 462 if (!sk_rmem_schedule(sk, skb, skb->truesize)) { 463 atomic_inc(&sk->sk_drops); 464 return -ENOBUFS; 465 } 466 467 skb->dev = NULL; 468 skb_set_owner_r(skb, sk); 469 470 /* we escape from rcu protected region, make sure we dont leak 471 * a norefcounted dst 472 */ 473 skb_dst_force(skb); 474 475 spin_lock_irqsave(&list->lock, flags); 476 sock_skb_set_dropcount(sk, skb); 477 __skb_queue_tail(list, skb); 478 spin_unlock_irqrestore(&list->lock, flags); 479 480 if (!sock_flag(sk, SOCK_DEAD)) 481 sk->sk_data_ready(sk); 482 return 0; 483 } 484 EXPORT_SYMBOL(__sock_queue_rcv_skb); 485 486 int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 487 { 488 int err; 489 490 err = sk_filter(sk, skb); 491 if (err) 492 return err; 493 494 return __sock_queue_rcv_skb(sk, skb); 495 } 496 EXPORT_SYMBOL(sock_queue_rcv_skb); 497 498 int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, 499 const int nested, unsigned int trim_cap, bool refcounted) 500 { 501 int rc = NET_RX_SUCCESS; 502 503 if (sk_filter_trim_cap(sk, skb, trim_cap)) 504 goto discard_and_relse; 505 506 skb->dev = NULL; 507 508 if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { 509 atomic_inc(&sk->sk_drops); 510 goto discard_and_relse; 511 } 512 if (nested) 513 bh_lock_sock_nested(sk); 514 else 515 bh_lock_sock(sk); 516 if (!sock_owned_by_user(sk)) { 517 /* 518 * trylock + unlock semantics: 519 */ 520 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 521 522 rc = sk_backlog_rcv(sk, skb); 523 524 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 525 } else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) { 526 bh_unlock_sock(sk); 527 atomic_inc(&sk->sk_drops); 528 goto discard_and_relse; 529 } 530 531 bh_unlock_sock(sk); 532 out: 533 if (refcounted) 534 sock_put(sk); 535 return rc; 536 discard_and_relse: 537 kfree_skb(skb); 538 goto out; 539 } 540 EXPORT_SYMBOL(__sk_receive_skb); 541 542 struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 543 { 544 struct dst_entry *dst = __sk_dst_get(sk); 545 546 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 547 sk_tx_queue_clear(sk); 548 sk->sk_dst_pending_confirm = 0; 549 RCU_INIT_POINTER(sk->sk_dst_cache, NULL); 550 dst_release(dst); 551 return NULL; 552 } 553 554 return dst; 555 } 556 EXPORT_SYMBOL(__sk_dst_check); 557 558 struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 559 { 560 struct dst_entry *dst = sk_dst_get(sk); 561 562 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 563 sk_dst_reset(sk); 564 dst_release(dst); 565 return NULL; 566 } 567 568 return dst; 569 } 570 EXPORT_SYMBOL(sk_dst_check); 571 572 static int sock_setbindtodevice_locked(struct sock *sk, int ifindex) 573 { 574 int ret = -ENOPROTOOPT; 575 #ifdef CONFIG_NETDEVICES 576 struct net *net = sock_net(sk); 577 578 /* Sorry... */ 579 ret = -EPERM; 580 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 581 goto out; 582 583 ret = -EINVAL; 584 if (ifindex < 0) 585 goto out; 586 587 sk->sk_bound_dev_if = ifindex; 588 if (sk->sk_prot->rehash) 589 sk->sk_prot->rehash(sk); 590 sk_dst_reset(sk); 591 592 ret = 0; 593 594 out: 595 #endif 596 597 return ret; 598 } 599 600 static int sock_setbindtodevice(struct sock *sk, char __user *optval, 601 int optlen) 602 { 603 int ret = -ENOPROTOOPT; 604 #ifdef CONFIG_NETDEVICES 605 struct net *net = sock_net(sk); 606 char devname[IFNAMSIZ]; 607 int index; 608 609 ret = -EINVAL; 610 if (optlen < 0) 611 goto out; 612 613 /* Bind this socket to a particular device like "eth0", 614 * as specified in the passed interface name. If the 615 * name is "" or the option length is zero the socket 616 * is not bound. 617 */ 618 if (optlen > IFNAMSIZ - 1) 619 optlen = IFNAMSIZ - 1; 620 memset(devname, 0, sizeof(devname)); 621 622 ret = -EFAULT; 623 if (copy_from_user(devname, optval, optlen)) 624 goto out; 625 626 index = 0; 627 if (devname[0] != '\0') { 628 struct net_device *dev; 629 630 rcu_read_lock(); 631 dev = dev_get_by_name_rcu(net, devname); 632 if (dev) 633 index = dev->ifindex; 634 rcu_read_unlock(); 635 ret = -ENODEV; 636 if (!dev) 637 goto out; 638 } 639 640 lock_sock(sk); 641 ret = sock_setbindtodevice_locked(sk, index); 642 release_sock(sk); 643 644 out: 645 #endif 646 647 return ret; 648 } 649 650 static int sock_getbindtodevice(struct sock *sk, char __user *optval, 651 int __user *optlen, int len) 652 { 653 int ret = -ENOPROTOOPT; 654 #ifdef CONFIG_NETDEVICES 655 struct net *net = sock_net(sk); 656 char devname[IFNAMSIZ]; 657 658 if (sk->sk_bound_dev_if == 0) { 659 len = 0; 660 goto zero; 661 } 662 663 ret = -EINVAL; 664 if (len < IFNAMSIZ) 665 goto out; 666 667 ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); 668 if (ret) 669 goto out; 670 671 len = strlen(devname) + 1; 672 673 ret = -EFAULT; 674 if (copy_to_user(optval, devname, len)) 675 goto out; 676 677 zero: 678 ret = -EFAULT; 679 if (put_user(len, optlen)) 680 goto out; 681 682 ret = 0; 683 684 out: 685 #endif 686 687 return ret; 688 } 689 690 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 691 { 692 if (valbool) 693 sock_set_flag(sk, bit); 694 else 695 sock_reset_flag(sk, bit); 696 } 697 698 bool sk_mc_loop(struct sock *sk) 699 { 700 if (dev_recursion_level()) 701 return false; 702 if (!sk) 703 return true; 704 switch (sk->sk_family) { 705 case AF_INET: 706 return inet_sk(sk)->mc_loop; 707 #if IS_ENABLED(CONFIG_IPV6) 708 case AF_INET6: 709 return inet6_sk(sk)->mc_loop; 710 #endif 711 } 712 WARN_ON(1); 713 return true; 714 } 715 EXPORT_SYMBOL(sk_mc_loop); 716 717 /* 718 * This is meant for all protocols to use and covers goings on 719 * at the socket level. Everything here is generic. 720 */ 721 722 int sock_setsockopt(struct socket *sock, int level, int optname, 723 char __user *optval, unsigned int optlen) 724 { 725 struct sock_txtime sk_txtime; 726 struct sock *sk = sock->sk; 727 int val; 728 int valbool; 729 struct linger ling; 730 int ret = 0; 731 732 /* 733 * Options without arguments 734 */ 735 736 if (optname == SO_BINDTODEVICE) 737 return sock_setbindtodevice(sk, optval, optlen); 738 739 if (optlen < sizeof(int)) 740 return -EINVAL; 741 742 if (get_user(val, (int __user *)optval)) 743 return -EFAULT; 744 745 valbool = val ? 1 : 0; 746 747 lock_sock(sk); 748 749 switch (optname) { 750 case SO_DEBUG: 751 if (val && !capable(CAP_NET_ADMIN)) 752 ret = -EACCES; 753 else 754 sock_valbool_flag(sk, SOCK_DBG, valbool); 755 break; 756 case SO_REUSEADDR: 757 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); 758 break; 759 case SO_REUSEPORT: 760 sk->sk_reuseport = valbool; 761 break; 762 case SO_TYPE: 763 case SO_PROTOCOL: 764 case SO_DOMAIN: 765 case SO_ERROR: 766 ret = -ENOPROTOOPT; 767 break; 768 case SO_DONTROUTE: 769 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 770 sk_dst_reset(sk); 771 break; 772 case SO_BROADCAST: 773 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 774 break; 775 case SO_SNDBUF: 776 /* Don't error on this BSD doesn't and if you think 777 * about it this is right. Otherwise apps have to 778 * play 'guess the biggest size' games. RCVBUF/SNDBUF 779 * are treated in BSD as hints 780 */ 781 val = min_t(u32, val, sysctl_wmem_max); 782 set_sndbuf: 783 /* Ensure val * 2 fits into an int, to prevent max_t() 784 * from treating it as a negative value. 785 */ 786 val = min_t(int, val, INT_MAX / 2); 787 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 788 WRITE_ONCE(sk->sk_sndbuf, 789 max_t(int, val * 2, SOCK_MIN_SNDBUF)); 790 /* Wake up sending tasks if we upped the value. */ 791 sk->sk_write_space(sk); 792 break; 793 794 case SO_SNDBUFFORCE: 795 if (!capable(CAP_NET_ADMIN)) { 796 ret = -EPERM; 797 break; 798 } 799 800 /* No negative values (to prevent underflow, as val will be 801 * multiplied by 2). 802 */ 803 if (val < 0) 804 val = 0; 805 goto set_sndbuf; 806 807 case SO_RCVBUF: 808 /* Don't error on this BSD doesn't and if you think 809 * about it this is right. Otherwise apps have to 810 * play 'guess the biggest size' games. RCVBUF/SNDBUF 811 * are treated in BSD as hints 812 */ 813 val = min_t(u32, val, sysctl_rmem_max); 814 set_rcvbuf: 815 /* Ensure val * 2 fits into an int, to prevent max_t() 816 * from treating it as a negative value. 817 */ 818 val = min_t(int, val, INT_MAX / 2); 819 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 820 /* 821 * We double it on the way in to account for 822 * "struct sk_buff" etc. overhead. Applications 823 * assume that the SO_RCVBUF setting they make will 824 * allow that much actual data to be received on that 825 * socket. 826 * 827 * Applications are unaware that "struct sk_buff" and 828 * other overheads allocate from the receive buffer 829 * during socket buffer allocation. 830 * 831 * And after considering the possible alternatives, 832 * returning the value we actually used in getsockopt 833 * is the most desirable behavior. 834 */ 835 WRITE_ONCE(sk->sk_rcvbuf, 836 max_t(int, val * 2, SOCK_MIN_RCVBUF)); 837 break; 838 839 case SO_RCVBUFFORCE: 840 if (!capable(CAP_NET_ADMIN)) { 841 ret = -EPERM; 842 break; 843 } 844 845 /* No negative values (to prevent underflow, as val will be 846 * multiplied by 2). 847 */ 848 if (val < 0) 849 val = 0; 850 goto set_rcvbuf; 851 852 case SO_KEEPALIVE: 853 if (sk->sk_prot->keepalive) 854 sk->sk_prot->keepalive(sk, valbool); 855 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 856 break; 857 858 case SO_OOBINLINE: 859 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 860 break; 861 862 case SO_NO_CHECK: 863 sk->sk_no_check_tx = valbool; 864 break; 865 866 case SO_PRIORITY: 867 if ((val >= 0 && val <= 6) || 868 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 869 sk->sk_priority = val; 870 else 871 ret = -EPERM; 872 break; 873 874 case SO_LINGER: 875 if (optlen < sizeof(ling)) { 876 ret = -EINVAL; /* 1003.1g */ 877 break; 878 } 879 if (copy_from_user(&ling, optval, sizeof(ling))) { 880 ret = -EFAULT; 881 break; 882 } 883 if (!ling.l_onoff) 884 sock_reset_flag(sk, SOCK_LINGER); 885 else { 886 #if (BITS_PER_LONG == 32) 887 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 888 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 889 else 890 #endif 891 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 892 sock_set_flag(sk, SOCK_LINGER); 893 } 894 break; 895 896 case SO_BSDCOMPAT: 897 sock_warn_obsolete_bsdism("setsockopt"); 898 break; 899 900 case SO_PASSCRED: 901 if (valbool) 902 set_bit(SOCK_PASSCRED, &sock->flags); 903 else 904 clear_bit(SOCK_PASSCRED, &sock->flags); 905 break; 906 907 case SO_TIMESTAMP_OLD: 908 case SO_TIMESTAMP_NEW: 909 case SO_TIMESTAMPNS_OLD: 910 case SO_TIMESTAMPNS_NEW: 911 if (valbool) { 912 if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW) 913 sock_set_flag(sk, SOCK_TSTAMP_NEW); 914 else 915 sock_reset_flag(sk, SOCK_TSTAMP_NEW); 916 917 if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW) 918 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 919 else 920 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 921 sock_set_flag(sk, SOCK_RCVTSTAMP); 922 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 923 } else { 924 sock_reset_flag(sk, SOCK_RCVTSTAMP); 925 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 926 sock_reset_flag(sk, SOCK_TSTAMP_NEW); 927 } 928 break; 929 930 case SO_TIMESTAMPING_NEW: 931 sock_set_flag(sk, SOCK_TSTAMP_NEW); 932 /* fall through */ 933 case SO_TIMESTAMPING_OLD: 934 if (val & ~SOF_TIMESTAMPING_MASK) { 935 ret = -EINVAL; 936 break; 937 } 938 939 if (val & SOF_TIMESTAMPING_OPT_ID && 940 !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { 941 if (sk->sk_protocol == IPPROTO_TCP && 942 sk->sk_type == SOCK_STREAM) { 943 if ((1 << sk->sk_state) & 944 (TCPF_CLOSE | TCPF_LISTEN)) { 945 ret = -EINVAL; 946 break; 947 } 948 sk->sk_tskey = tcp_sk(sk)->snd_una; 949 } else { 950 sk->sk_tskey = 0; 951 } 952 } 953 954 if (val & SOF_TIMESTAMPING_OPT_STATS && 955 !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { 956 ret = -EINVAL; 957 break; 958 } 959 960 sk->sk_tsflags = val; 961 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 962 sock_enable_timestamp(sk, 963 SOCK_TIMESTAMPING_RX_SOFTWARE); 964 else { 965 if (optname == SO_TIMESTAMPING_NEW) 966 sock_reset_flag(sk, SOCK_TSTAMP_NEW); 967 968 sock_disable_timestamp(sk, 969 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); 970 } 971 break; 972 973 case SO_RCVLOWAT: 974 if (val < 0) 975 val = INT_MAX; 976 if (sock->ops->set_rcvlowat) 977 ret = sock->ops->set_rcvlowat(sk, val); 978 else 979 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 980 break; 981 982 case SO_RCVTIMEO_OLD: 983 case SO_RCVTIMEO_NEW: 984 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD); 985 break; 986 987 case SO_SNDTIMEO_OLD: 988 case SO_SNDTIMEO_NEW: 989 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD); 990 break; 991 992 case SO_ATTACH_FILTER: 993 ret = -EINVAL; 994 if (optlen == sizeof(struct sock_fprog)) { 995 struct sock_fprog fprog; 996 997 ret = -EFAULT; 998 if (copy_from_user(&fprog, optval, sizeof(fprog))) 999 break; 1000 1001 ret = sk_attach_filter(&fprog, sk); 1002 } 1003 break; 1004 1005 case SO_ATTACH_BPF: 1006 ret = -EINVAL; 1007 if (optlen == sizeof(u32)) { 1008 u32 ufd; 1009 1010 ret = -EFAULT; 1011 if (copy_from_user(&ufd, optval, sizeof(ufd))) 1012 break; 1013 1014 ret = sk_attach_bpf(ufd, sk); 1015 } 1016 break; 1017 1018 case SO_ATTACH_REUSEPORT_CBPF: 1019 ret = -EINVAL; 1020 if (optlen == sizeof(struct sock_fprog)) { 1021 struct sock_fprog fprog; 1022 1023 ret = -EFAULT; 1024 if (copy_from_user(&fprog, optval, sizeof(fprog))) 1025 break; 1026 1027 ret = sk_reuseport_attach_filter(&fprog, sk); 1028 } 1029 break; 1030 1031 case SO_ATTACH_REUSEPORT_EBPF: 1032 ret = -EINVAL; 1033 if (optlen == sizeof(u32)) { 1034 u32 ufd; 1035 1036 ret = -EFAULT; 1037 if (copy_from_user(&ufd, optval, sizeof(ufd))) 1038 break; 1039 1040 ret = sk_reuseport_attach_bpf(ufd, sk); 1041 } 1042 break; 1043 1044 case SO_DETACH_REUSEPORT_BPF: 1045 ret = reuseport_detach_prog(sk); 1046 break; 1047 1048 case SO_DETACH_FILTER: 1049 ret = sk_detach_filter(sk); 1050 break; 1051 1052 case SO_LOCK_FILTER: 1053 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) 1054 ret = -EPERM; 1055 else 1056 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); 1057 break; 1058 1059 case SO_PASSSEC: 1060 if (valbool) 1061 set_bit(SOCK_PASSSEC, &sock->flags); 1062 else 1063 clear_bit(SOCK_PASSSEC, &sock->flags); 1064 break; 1065 case SO_MARK: 1066 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1067 ret = -EPERM; 1068 } else if (val != sk->sk_mark) { 1069 sk->sk_mark = val; 1070 sk_dst_reset(sk); 1071 } 1072 break; 1073 1074 case SO_RXQ_OVFL: 1075 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); 1076 break; 1077 1078 case SO_WIFI_STATUS: 1079 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); 1080 break; 1081 1082 case SO_PEEK_OFF: 1083 if (sock->ops->set_peek_off) 1084 ret = sock->ops->set_peek_off(sk, val); 1085 else 1086 ret = -EOPNOTSUPP; 1087 break; 1088 1089 case SO_NOFCS: 1090 sock_valbool_flag(sk, SOCK_NOFCS, valbool); 1091 break; 1092 1093 case SO_SELECT_ERR_QUEUE: 1094 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); 1095 break; 1096 1097 #ifdef CONFIG_NET_RX_BUSY_POLL 1098 case SO_BUSY_POLL: 1099 /* allow unprivileged users to decrease the value */ 1100 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) 1101 ret = -EPERM; 1102 else { 1103 if (val < 0) 1104 ret = -EINVAL; 1105 else 1106 sk->sk_ll_usec = val; 1107 } 1108 break; 1109 #endif 1110 1111 case SO_MAX_PACING_RATE: 1112 { 1113 unsigned long ulval = (val == ~0U) ? ~0UL : val; 1114 1115 if (sizeof(ulval) != sizeof(val) && 1116 optlen >= sizeof(ulval) && 1117 get_user(ulval, (unsigned long __user *)optval)) { 1118 ret = -EFAULT; 1119 break; 1120 } 1121 if (ulval != ~0UL) 1122 cmpxchg(&sk->sk_pacing_status, 1123 SK_PACING_NONE, 1124 SK_PACING_NEEDED); 1125 sk->sk_max_pacing_rate = ulval; 1126 sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval); 1127 break; 1128 } 1129 case SO_INCOMING_CPU: 1130 WRITE_ONCE(sk->sk_incoming_cpu, val); 1131 break; 1132 1133 case SO_CNX_ADVICE: 1134 if (val == 1) 1135 dst_negative_advice(sk); 1136 break; 1137 1138 case SO_ZEROCOPY: 1139 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) { 1140 if (!((sk->sk_type == SOCK_STREAM && 1141 sk->sk_protocol == IPPROTO_TCP) || 1142 (sk->sk_type == SOCK_DGRAM && 1143 sk->sk_protocol == IPPROTO_UDP))) 1144 ret = -ENOTSUPP; 1145 } else if (sk->sk_family != PF_RDS) { 1146 ret = -ENOTSUPP; 1147 } 1148 if (!ret) { 1149 if (val < 0 || val > 1) 1150 ret = -EINVAL; 1151 else 1152 sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); 1153 } 1154 break; 1155 1156 case SO_TXTIME: 1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { 1158 ret = -EPERM; 1159 } else if (optlen != sizeof(struct sock_txtime)) { 1160 ret = -EINVAL; 1161 } else if (copy_from_user(&sk_txtime, optval, 1162 sizeof(struct sock_txtime))) { 1163 ret = -EFAULT; 1164 } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) { 1165 ret = -EINVAL; 1166 } else { 1167 sock_valbool_flag(sk, SOCK_TXTIME, true); 1168 sk->sk_clockid = sk_txtime.clockid; 1169 sk->sk_txtime_deadline_mode = 1170 !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE); 1171 sk->sk_txtime_report_errors = 1172 !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS); 1173 } 1174 break; 1175 1176 case SO_BINDTOIFINDEX: 1177 ret = sock_setbindtodevice_locked(sk, val); 1178 break; 1179 1180 default: 1181 ret = -ENOPROTOOPT; 1182 break; 1183 } 1184 release_sock(sk); 1185 return ret; 1186 } 1187 EXPORT_SYMBOL(sock_setsockopt); 1188 1189 1190 static void cred_to_ucred(struct pid *pid, const struct cred *cred, 1191 struct ucred *ucred) 1192 { 1193 ucred->pid = pid_vnr(pid); 1194 ucred->uid = ucred->gid = -1; 1195 if (cred) { 1196 struct user_namespace *current_ns = current_user_ns(); 1197 1198 ucred->uid = from_kuid_munged(current_ns, cred->euid); 1199 ucred->gid = from_kgid_munged(current_ns, cred->egid); 1200 } 1201 } 1202 1203 static int groups_to_user(gid_t __user *dst, const struct group_info *src) 1204 { 1205 struct user_namespace *user_ns = current_user_ns(); 1206 int i; 1207 1208 for (i = 0; i < src->ngroups; i++) 1209 if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) 1210 return -EFAULT; 1211 1212 return 0; 1213 } 1214 1215 int sock_getsockopt(struct socket *sock, int level, int optname, 1216 char __user *optval, int __user *optlen) 1217 { 1218 struct sock *sk = sock->sk; 1219 1220 union { 1221 int val; 1222 u64 val64; 1223 unsigned long ulval; 1224 struct linger ling; 1225 struct old_timeval32 tm32; 1226 struct __kernel_old_timeval tm; 1227 struct __kernel_sock_timeval stm; 1228 struct sock_txtime txtime; 1229 } v; 1230 1231 int lv = sizeof(int); 1232 int len; 1233 1234 if (get_user(len, optlen)) 1235 return -EFAULT; 1236 if (len < 0) 1237 return -EINVAL; 1238 1239 memset(&v, 0, sizeof(v)); 1240 1241 switch (optname) { 1242 case SO_DEBUG: 1243 v.val = sock_flag(sk, SOCK_DBG); 1244 break; 1245 1246 case SO_DONTROUTE: 1247 v.val = sock_flag(sk, SOCK_LOCALROUTE); 1248 break; 1249 1250 case SO_BROADCAST: 1251 v.val = sock_flag(sk, SOCK_BROADCAST); 1252 break; 1253 1254 case SO_SNDBUF: 1255 v.val = sk->sk_sndbuf; 1256 break; 1257 1258 case SO_RCVBUF: 1259 v.val = sk->sk_rcvbuf; 1260 break; 1261 1262 case SO_REUSEADDR: 1263 v.val = sk->sk_reuse; 1264 break; 1265 1266 case SO_REUSEPORT: 1267 v.val = sk->sk_reuseport; 1268 break; 1269 1270 case SO_KEEPALIVE: 1271 v.val = sock_flag(sk, SOCK_KEEPOPEN); 1272 break; 1273 1274 case SO_TYPE: 1275 v.val = sk->sk_type; 1276 break; 1277 1278 case SO_PROTOCOL: 1279 v.val = sk->sk_protocol; 1280 break; 1281 1282 case SO_DOMAIN: 1283 v.val = sk->sk_family; 1284 break; 1285 1286 case SO_ERROR: 1287 v.val = -sock_error(sk); 1288 if (v.val == 0) 1289 v.val = xchg(&sk->sk_err_soft, 0); 1290 break; 1291 1292 case SO_OOBINLINE: 1293 v.val = sock_flag(sk, SOCK_URGINLINE); 1294 break; 1295 1296 case SO_NO_CHECK: 1297 v.val = sk->sk_no_check_tx; 1298 break; 1299 1300 case SO_PRIORITY: 1301 v.val = sk->sk_priority; 1302 break; 1303 1304 case SO_LINGER: 1305 lv = sizeof(v.ling); 1306 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); 1307 v.ling.l_linger = sk->sk_lingertime / HZ; 1308 break; 1309 1310 case SO_BSDCOMPAT: 1311 sock_warn_obsolete_bsdism("getsockopt"); 1312 break; 1313 1314 case SO_TIMESTAMP_OLD: 1315 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 1316 !sock_flag(sk, SOCK_TSTAMP_NEW) && 1317 !sock_flag(sk, SOCK_RCVTSTAMPNS); 1318 break; 1319 1320 case SO_TIMESTAMPNS_OLD: 1321 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW); 1322 break; 1323 1324 case SO_TIMESTAMP_NEW: 1325 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW); 1326 break; 1327 1328 case SO_TIMESTAMPNS_NEW: 1329 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW); 1330 break; 1331 1332 case SO_TIMESTAMPING_OLD: 1333 v.val = sk->sk_tsflags; 1334 break; 1335 1336 case SO_RCVTIMEO_OLD: 1337 case SO_RCVTIMEO_NEW: 1338 lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname); 1339 break; 1340 1341 case SO_SNDTIMEO_OLD: 1342 case SO_SNDTIMEO_NEW: 1343 lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname); 1344 break; 1345 1346 case SO_RCVLOWAT: 1347 v.val = sk->sk_rcvlowat; 1348 break; 1349 1350 case SO_SNDLOWAT: 1351 v.val = 1; 1352 break; 1353 1354 case SO_PASSCRED: 1355 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); 1356 break; 1357 1358 case SO_PEERCRED: 1359 { 1360 struct ucred peercred; 1361 if (len > sizeof(peercred)) 1362 len = sizeof(peercred); 1363 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); 1364 if (copy_to_user(optval, &peercred, len)) 1365 return -EFAULT; 1366 goto lenout; 1367 } 1368 1369 case SO_PEERGROUPS: 1370 { 1371 int ret, n; 1372 1373 if (!sk->sk_peer_cred) 1374 return -ENODATA; 1375 1376 n = sk->sk_peer_cred->group_info->ngroups; 1377 if (len < n * sizeof(gid_t)) { 1378 len = n * sizeof(gid_t); 1379 return put_user(len, optlen) ? -EFAULT : -ERANGE; 1380 } 1381 len = n * sizeof(gid_t); 1382 1383 ret = groups_to_user((gid_t __user *)optval, 1384 sk->sk_peer_cred->group_info); 1385 if (ret) 1386 return ret; 1387 goto lenout; 1388 } 1389 1390 case SO_PEERNAME: 1391 { 1392 char address[128]; 1393 1394 lv = sock->ops->getname(sock, (struct sockaddr *)address, 2); 1395 if (lv < 0) 1396 return -ENOTCONN; 1397 if (lv < len) 1398 return -EINVAL; 1399 if (copy_to_user(optval, address, len)) 1400 return -EFAULT; 1401 goto lenout; 1402 } 1403 1404 /* Dubious BSD thing... Probably nobody even uses it, but 1405 * the UNIX standard wants it for whatever reason... -DaveM 1406 */ 1407 case SO_ACCEPTCONN: 1408 v.val = sk->sk_state == TCP_LISTEN; 1409 break; 1410 1411 case SO_PASSSEC: 1412 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); 1413 break; 1414 1415 case SO_PEERSEC: 1416 return security_socket_getpeersec_stream(sock, optval, optlen, len); 1417 1418 case SO_MARK: 1419 v.val = sk->sk_mark; 1420 break; 1421 1422 case SO_RXQ_OVFL: 1423 v.val = sock_flag(sk, SOCK_RXQ_OVFL); 1424 break; 1425 1426 case SO_WIFI_STATUS: 1427 v.val = sock_flag(sk, SOCK_WIFI_STATUS); 1428 break; 1429 1430 case SO_PEEK_OFF: 1431 if (!sock->ops->set_peek_off) 1432 return -EOPNOTSUPP; 1433 1434 v.val = sk->sk_peek_off; 1435 break; 1436 case SO_NOFCS: 1437 v.val = sock_flag(sk, SOCK_NOFCS); 1438 break; 1439 1440 case SO_BINDTODEVICE: 1441 return sock_getbindtodevice(sk, optval, optlen, len); 1442 1443 case SO_GET_FILTER: 1444 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); 1445 if (len < 0) 1446 return len; 1447 1448 goto lenout; 1449 1450 case SO_LOCK_FILTER: 1451 v.val = sock_flag(sk, SOCK_FILTER_LOCKED); 1452 break; 1453 1454 case SO_BPF_EXTENSIONS: 1455 v.val = bpf_tell_extensions(); 1456 break; 1457 1458 case SO_SELECT_ERR_QUEUE: 1459 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); 1460 break; 1461 1462 #ifdef CONFIG_NET_RX_BUSY_POLL 1463 case SO_BUSY_POLL: 1464 v.val = sk->sk_ll_usec; 1465 break; 1466 #endif 1467 1468 case SO_MAX_PACING_RATE: 1469 if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) { 1470 lv = sizeof(v.ulval); 1471 v.ulval = sk->sk_max_pacing_rate; 1472 } else { 1473 /* 32bit version */ 1474 v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U); 1475 } 1476 break; 1477 1478 case SO_INCOMING_CPU: 1479 v.val = READ_ONCE(sk->sk_incoming_cpu); 1480 break; 1481 1482 case SO_MEMINFO: 1483 { 1484 u32 meminfo[SK_MEMINFO_VARS]; 1485 1486 sk_get_meminfo(sk, meminfo); 1487 1488 len = min_t(unsigned int, len, sizeof(meminfo)); 1489 if (copy_to_user(optval, &meminfo, len)) 1490 return -EFAULT; 1491 1492 goto lenout; 1493 } 1494 1495 #ifdef CONFIG_NET_RX_BUSY_POLL 1496 case SO_INCOMING_NAPI_ID: 1497 v.val = READ_ONCE(sk->sk_napi_id); 1498 1499 /* aggregate non-NAPI IDs down to 0 */ 1500 if (v.val < MIN_NAPI_ID) 1501 v.val = 0; 1502 1503 break; 1504 #endif 1505 1506 case SO_COOKIE: 1507 lv = sizeof(u64); 1508 if (len < lv) 1509 return -EINVAL; 1510 v.val64 = sock_gen_cookie(sk); 1511 break; 1512 1513 case SO_ZEROCOPY: 1514 v.val = sock_flag(sk, SOCK_ZEROCOPY); 1515 break; 1516 1517 case SO_TXTIME: 1518 lv = sizeof(v.txtime); 1519 v.txtime.clockid = sk->sk_clockid; 1520 v.txtime.flags |= sk->sk_txtime_deadline_mode ? 1521 SOF_TXTIME_DEADLINE_MODE : 0; 1522 v.txtime.flags |= sk->sk_txtime_report_errors ? 1523 SOF_TXTIME_REPORT_ERRORS : 0; 1524 break; 1525 1526 case SO_BINDTOIFINDEX: 1527 v.val = sk->sk_bound_dev_if; 1528 break; 1529 1530 default: 1531 /* We implement the SO_SNDLOWAT etc to not be settable 1532 * (1003.1g 7). 1533 */ 1534 return -ENOPROTOOPT; 1535 } 1536 1537 if (len > lv) 1538 len = lv; 1539 if (copy_to_user(optval, &v, len)) 1540 return -EFAULT; 1541 lenout: 1542 if (put_user(len, optlen)) 1543 return -EFAULT; 1544 return 0; 1545 } 1546 1547 /* 1548 * Initialize an sk_lock. 1549 * 1550 * (We also register the sk_lock with the lock validator.) 1551 */ 1552 static inline void sock_lock_init(struct sock *sk) 1553 { 1554 if (sk->sk_kern_sock) 1555 sock_lock_init_class_and_name( 1556 sk, 1557 af_family_kern_slock_key_strings[sk->sk_family], 1558 af_family_kern_slock_keys + sk->sk_family, 1559 af_family_kern_key_strings[sk->sk_family], 1560 af_family_kern_keys + sk->sk_family); 1561 else 1562 sock_lock_init_class_and_name( 1563 sk, 1564 af_family_slock_key_strings[sk->sk_family], 1565 af_family_slock_keys + sk->sk_family, 1566 af_family_key_strings[sk->sk_family], 1567 af_family_keys + sk->sk_family); 1568 } 1569 1570 /* 1571 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 1572 * even temporarly, because of RCU lookups. sk_node should also be left as is. 1573 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end 1574 */ 1575 static void sock_copy(struct sock *nsk, const struct sock *osk) 1576 { 1577 #ifdef CONFIG_SECURITY_NETWORK 1578 void *sptr = nsk->sk_security; 1579 #endif 1580 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); 1581 1582 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, 1583 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); 1584 1585 #ifdef CONFIG_SECURITY_NETWORK 1586 nsk->sk_security = sptr; 1587 security_sk_clone(osk, nsk); 1588 #endif 1589 } 1590 1591 static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1592 int family) 1593 { 1594 struct sock *sk; 1595 struct kmem_cache *slab; 1596 1597 slab = prot->slab; 1598 if (slab != NULL) { 1599 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1600 if (!sk) 1601 return sk; 1602 if (want_init_on_alloc(priority)) 1603 sk_prot_clear_nulls(sk, prot->obj_size); 1604 } else 1605 sk = kmalloc(prot->obj_size, priority); 1606 1607 if (sk != NULL) { 1608 if (security_sk_alloc(sk, family, priority)) 1609 goto out_free; 1610 1611 if (!try_module_get(prot->owner)) 1612 goto out_free_sec; 1613 sk_tx_queue_clear(sk); 1614 } 1615 1616 return sk; 1617 1618 out_free_sec: 1619 security_sk_free(sk); 1620 out_free: 1621 if (slab != NULL) 1622 kmem_cache_free(slab, sk); 1623 else 1624 kfree(sk); 1625 return NULL; 1626 } 1627 1628 static void sk_prot_free(struct proto *prot, struct sock *sk) 1629 { 1630 struct kmem_cache *slab; 1631 struct module *owner; 1632 1633 owner = prot->owner; 1634 slab = prot->slab; 1635 1636 cgroup_sk_free(&sk->sk_cgrp_data); 1637 mem_cgroup_sk_free(sk); 1638 security_sk_free(sk); 1639 if (slab != NULL) 1640 kmem_cache_free(slab, sk); 1641 else 1642 kfree(sk); 1643 module_put(owner); 1644 } 1645 1646 /** 1647 * sk_alloc - All socket objects are allocated here 1648 * @net: the applicable net namespace 1649 * @family: protocol family 1650 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1651 * @prot: struct proto associated with this new sock instance 1652 * @kern: is this to be a kernel socket? 1653 */ 1654 struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1655 struct proto *prot, int kern) 1656 { 1657 struct sock *sk; 1658 1659 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1660 if (sk) { 1661 sk->sk_family = family; 1662 /* 1663 * See comment in struct sock definition to understand 1664 * why we need sk_prot_creator -acme 1665 */ 1666 sk->sk_prot = sk->sk_prot_creator = prot; 1667 sk->sk_kern_sock = kern; 1668 sock_lock_init(sk); 1669 sk->sk_net_refcnt = kern ? 0 : 1; 1670 if (likely(sk->sk_net_refcnt)) { 1671 get_net(net); 1672 sock_inuse_add(net, 1); 1673 } 1674 1675 sock_net_set(sk, net); 1676 refcount_set(&sk->sk_wmem_alloc, 1); 1677 1678 mem_cgroup_sk_alloc(sk); 1679 cgroup_sk_alloc(&sk->sk_cgrp_data); 1680 sock_update_classid(&sk->sk_cgrp_data); 1681 sock_update_netprioidx(&sk->sk_cgrp_data); 1682 } 1683 1684 return sk; 1685 } 1686 EXPORT_SYMBOL(sk_alloc); 1687 1688 /* Sockets having SOCK_RCU_FREE will call this function after one RCU 1689 * grace period. This is the case for UDP sockets and TCP listeners. 1690 */ 1691 static void __sk_destruct(struct rcu_head *head) 1692 { 1693 struct sock *sk = container_of(head, struct sock, sk_rcu); 1694 struct sk_filter *filter; 1695 1696 if (sk->sk_destruct) 1697 sk->sk_destruct(sk); 1698 1699 filter = rcu_dereference_check(sk->sk_filter, 1700 refcount_read(&sk->sk_wmem_alloc) == 0); 1701 if (filter) { 1702 sk_filter_uncharge(sk, filter); 1703 RCU_INIT_POINTER(sk->sk_filter, NULL); 1704 } 1705 1706 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); 1707 1708 #ifdef CONFIG_BPF_SYSCALL 1709 bpf_sk_storage_free(sk); 1710 #endif 1711 1712 if (atomic_read(&sk->sk_omem_alloc)) 1713 pr_debug("%s: optmem leakage (%d bytes) detected\n", 1714 __func__, atomic_read(&sk->sk_omem_alloc)); 1715 1716 if (sk->sk_frag.page) { 1717 put_page(sk->sk_frag.page); 1718 sk->sk_frag.page = NULL; 1719 } 1720 1721 if (sk->sk_peer_cred) 1722 put_cred(sk->sk_peer_cred); 1723 put_pid(sk->sk_peer_pid); 1724 if (likely(sk->sk_net_refcnt)) 1725 put_net(sock_net(sk)); 1726 sk_prot_free(sk->sk_prot_creator, sk); 1727 } 1728 1729 void sk_destruct(struct sock *sk) 1730 { 1731 bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE); 1732 1733 if (rcu_access_pointer(sk->sk_reuseport_cb)) { 1734 reuseport_detach_sock(sk); 1735 use_call_rcu = true; 1736 } 1737 1738 if (use_call_rcu) 1739 call_rcu(&sk->sk_rcu, __sk_destruct); 1740 else 1741 __sk_destruct(&sk->sk_rcu); 1742 } 1743 1744 static void __sk_free(struct sock *sk) 1745 { 1746 if (likely(sk->sk_net_refcnt)) 1747 sock_inuse_add(sock_net(sk), -1); 1748 1749 if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) 1750 sock_diag_broadcast_destroy(sk); 1751 else 1752 sk_destruct(sk); 1753 } 1754 1755 void sk_free(struct sock *sk) 1756 { 1757 /* 1758 * We subtract one from sk_wmem_alloc and can know if 1759 * some packets are still in some tx queue. 1760 * If not null, sock_wfree() will call __sk_free(sk) later 1761 */ 1762 if (refcount_dec_and_test(&sk->sk_wmem_alloc)) 1763 __sk_free(sk); 1764 } 1765 EXPORT_SYMBOL(sk_free); 1766 1767 static void sk_init_common(struct sock *sk) 1768 { 1769 skb_queue_head_init(&sk->sk_receive_queue); 1770 skb_queue_head_init(&sk->sk_write_queue); 1771 skb_queue_head_init(&sk->sk_error_queue); 1772 1773 rwlock_init(&sk->sk_callback_lock); 1774 lockdep_set_class_and_name(&sk->sk_receive_queue.lock, 1775 af_rlock_keys + sk->sk_family, 1776 af_family_rlock_key_strings[sk->sk_family]); 1777 lockdep_set_class_and_name(&sk->sk_write_queue.lock, 1778 af_wlock_keys + sk->sk_family, 1779 af_family_wlock_key_strings[sk->sk_family]); 1780 lockdep_set_class_and_name(&sk->sk_error_queue.lock, 1781 af_elock_keys + sk->sk_family, 1782 af_family_elock_key_strings[sk->sk_family]); 1783 lockdep_set_class_and_name(&sk->sk_callback_lock, 1784 af_callback_keys + sk->sk_family, 1785 af_family_clock_key_strings[sk->sk_family]); 1786 } 1787 1788 /** 1789 * sk_clone_lock - clone a socket, and lock its clone 1790 * @sk: the socket to clone 1791 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1792 * 1793 * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) 1794 */ 1795 struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) 1796 { 1797 struct sock *newsk; 1798 bool is_charged = true; 1799 1800 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1801 if (newsk != NULL) { 1802 struct sk_filter *filter; 1803 1804 sock_copy(newsk, sk); 1805 1806 newsk->sk_prot_creator = sk->sk_prot; 1807 1808 /* SANITY */ 1809 if (likely(newsk->sk_net_refcnt)) 1810 get_net(sock_net(newsk)); 1811 sk_node_init(&newsk->sk_node); 1812 sock_lock_init(newsk); 1813 bh_lock_sock(newsk); 1814 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1815 newsk->sk_backlog.len = 0; 1816 1817 atomic_set(&newsk->sk_rmem_alloc, 0); 1818 /* 1819 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1820 */ 1821 refcount_set(&newsk->sk_wmem_alloc, 1); 1822 atomic_set(&newsk->sk_omem_alloc, 0); 1823 sk_init_common(newsk); 1824 1825 newsk->sk_dst_cache = NULL; 1826 newsk->sk_dst_pending_confirm = 0; 1827 newsk->sk_wmem_queued = 0; 1828 newsk->sk_forward_alloc = 0; 1829 atomic_set(&newsk->sk_drops, 0); 1830 newsk->sk_send_head = NULL; 1831 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1832 atomic_set(&newsk->sk_zckey, 0); 1833 1834 sock_reset_flag(newsk, SOCK_DONE); 1835 mem_cgroup_sk_alloc(newsk); 1836 cgroup_sk_alloc(&newsk->sk_cgrp_data); 1837 1838 rcu_read_lock(); 1839 filter = rcu_dereference(sk->sk_filter); 1840 if (filter != NULL) 1841 /* though it's an empty new sock, the charging may fail 1842 * if sysctl_optmem_max was changed between creation of 1843 * original socket and cloning 1844 */ 1845 is_charged = sk_filter_charge(newsk, filter); 1846 RCU_INIT_POINTER(newsk->sk_filter, filter); 1847 rcu_read_unlock(); 1848 1849 if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { 1850 /* We need to make sure that we don't uncharge the new 1851 * socket if we couldn't charge it in the first place 1852 * as otherwise we uncharge the parent's filter. 1853 */ 1854 if (!is_charged) 1855 RCU_INIT_POINTER(newsk->sk_filter, NULL); 1856 sk_free_unlock_clone(newsk); 1857 newsk = NULL; 1858 goto out; 1859 } 1860 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); 1861 1862 if (bpf_sk_storage_clone(sk, newsk)) { 1863 sk_free_unlock_clone(newsk); 1864 newsk = NULL; 1865 goto out; 1866 } 1867 1868 newsk->sk_err = 0; 1869 newsk->sk_err_soft = 0; 1870 newsk->sk_priority = 0; 1871 newsk->sk_incoming_cpu = raw_smp_processor_id(); 1872 if (likely(newsk->sk_net_refcnt)) 1873 sock_inuse_add(sock_net(newsk), 1); 1874 1875 /* 1876 * Before updating sk_refcnt, we must commit prior changes to memory 1877 * (Documentation/RCU/rculist_nulls.txt for details) 1878 */ 1879 smp_wmb(); 1880 refcount_set(&newsk->sk_refcnt, 2); 1881 1882 /* 1883 * Increment the counter in the same struct proto as the master 1884 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1885 * is the same as sk->sk_prot->socks, as this field was copied 1886 * with memcpy). 1887 * 1888 * This _changes_ the previous behaviour, where 1889 * tcp_create_openreq_child always was incrementing the 1890 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1891 * to be taken into account in all callers. -acme 1892 */ 1893 sk_refcnt_debug_inc(newsk); 1894 sk_set_socket(newsk, NULL); 1895 RCU_INIT_POINTER(newsk->sk_wq, NULL); 1896 1897 if (newsk->sk_prot->sockets_allocated) 1898 sk_sockets_allocated_inc(newsk); 1899 1900 if (sock_needs_netstamp(sk) && 1901 newsk->sk_flags & SK_FLAGS_TIMESTAMP) 1902 net_enable_timestamp(); 1903 } 1904 out: 1905 return newsk; 1906 } 1907 EXPORT_SYMBOL_GPL(sk_clone_lock); 1908 1909 void sk_free_unlock_clone(struct sock *sk) 1910 { 1911 /* It is still raw copy of parent, so invalidate 1912 * destructor and make plain sk_free() */ 1913 sk->sk_destruct = NULL; 1914 bh_unlock_sock(sk); 1915 sk_free(sk); 1916 } 1917 EXPORT_SYMBOL_GPL(sk_free_unlock_clone); 1918 1919 void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1920 { 1921 u32 max_segs = 1; 1922 1923 sk_dst_set(sk, dst); 1924 sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps; 1925 if (sk->sk_route_caps & NETIF_F_GSO) 1926 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1927 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1928 if (sk_can_gso(sk)) { 1929 if (dst->header_len && !xfrm_dst_offload_ok(dst)) { 1930 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1931 } else { 1932 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1933 sk->sk_gso_max_size = dst->dev->gso_max_size; 1934 max_segs = max_t(u32, dst->dev->gso_max_segs, 1); 1935 } 1936 } 1937 sk->sk_gso_max_segs = max_segs; 1938 } 1939 EXPORT_SYMBOL_GPL(sk_setup_caps); 1940 1941 /* 1942 * Simple resource managers for sockets. 1943 */ 1944 1945 1946 /* 1947 * Write buffer destructor automatically called from kfree_skb. 1948 */ 1949 void sock_wfree(struct sk_buff *skb) 1950 { 1951 struct sock *sk = skb->sk; 1952 unsigned int len = skb->truesize; 1953 1954 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1955 /* 1956 * Keep a reference on sk_wmem_alloc, this will be released 1957 * after sk_write_space() call 1958 */ 1959 WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); 1960 sk->sk_write_space(sk); 1961 len = 1; 1962 } 1963 /* 1964 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1965 * could not do because of in-flight packets 1966 */ 1967 if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) 1968 __sk_free(sk); 1969 } 1970 EXPORT_SYMBOL(sock_wfree); 1971 1972 /* This variant of sock_wfree() is used by TCP, 1973 * since it sets SOCK_USE_WRITE_QUEUE. 1974 */ 1975 void __sock_wfree(struct sk_buff *skb) 1976 { 1977 struct sock *sk = skb->sk; 1978 1979 if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) 1980 __sk_free(sk); 1981 } 1982 1983 void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) 1984 { 1985 skb_orphan(skb); 1986 skb->sk = sk; 1987 #ifdef CONFIG_INET 1988 if (unlikely(!sk_fullsock(sk))) { 1989 skb->destructor = sock_edemux; 1990 sock_hold(sk); 1991 return; 1992 } 1993 #endif 1994 skb->destructor = sock_wfree; 1995 skb_set_hash_from_sk(skb, sk); 1996 /* 1997 * We used to take a refcount on sk, but following operation 1998 * is enough to guarantee sk_free() wont free this sock until 1999 * all in-flight packets are completed 2000 */ 2001 refcount_add(skb->truesize, &sk->sk_wmem_alloc); 2002 } 2003 EXPORT_SYMBOL(skb_set_owner_w); 2004 2005 static bool can_skb_orphan_partial(const struct sk_buff *skb) 2006 { 2007 #ifdef CONFIG_TLS_DEVICE 2008 /* Drivers depend on in-order delivery for crypto offload, 2009 * partial orphan breaks out-of-order-OK logic. 2010 */ 2011 if (skb->decrypted) 2012 return false; 2013 #endif 2014 return (skb->destructor == sock_wfree || 2015 (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree)); 2016 } 2017 2018 /* This helper is used by netem, as it can hold packets in its 2019 * delay queue. We want to allow the owner socket to send more 2020 * packets, as if they were already TX completed by a typical driver. 2021 * But we also want to keep skb->sk set because some packet schedulers 2022 * rely on it (sch_fq for example). 2023 */ 2024 void skb_orphan_partial(struct sk_buff *skb) 2025 { 2026 if (skb_is_tcp_pure_ack(skb)) 2027 return; 2028 2029 if (can_skb_orphan_partial(skb)) { 2030 struct sock *sk = skb->sk; 2031 2032 if (refcount_inc_not_zero(&sk->sk_refcnt)) { 2033 WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); 2034 skb->destructor = sock_efree; 2035 } 2036 } else { 2037 skb_orphan(skb); 2038 } 2039 } 2040 EXPORT_SYMBOL(skb_orphan_partial); 2041 2042 /* 2043 * Read buffer destructor automatically called from kfree_skb. 2044 */ 2045 void sock_rfree(struct sk_buff *skb) 2046 { 2047 struct sock *sk = skb->sk; 2048 unsigned int len = skb->truesize; 2049 2050 atomic_sub(len, &sk->sk_rmem_alloc); 2051 sk_mem_uncharge(sk, len); 2052 } 2053 EXPORT_SYMBOL(sock_rfree); 2054 2055 /* 2056 * Buffer destructor for skbs that are not used directly in read or write 2057 * path, e.g. for error handler skbs. Automatically called from kfree_skb. 2058 */ 2059 void sock_efree(struct sk_buff *skb) 2060 { 2061 sock_put(skb->sk); 2062 } 2063 EXPORT_SYMBOL(sock_efree); 2064 2065 kuid_t sock_i_uid(struct sock *sk) 2066 { 2067 kuid_t uid; 2068 2069 read_lock_bh(&sk->sk_callback_lock); 2070 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; 2071 read_unlock_bh(&sk->sk_callback_lock); 2072 return uid; 2073 } 2074 EXPORT_SYMBOL(sock_i_uid); 2075 2076 unsigned long sock_i_ino(struct sock *sk) 2077 { 2078 unsigned long ino; 2079 2080 read_lock_bh(&sk->sk_callback_lock); 2081 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 2082 read_unlock_bh(&sk->sk_callback_lock); 2083 return ino; 2084 } 2085 EXPORT_SYMBOL(sock_i_ino); 2086 2087 /* 2088 * Allocate a skb from the socket's send buffer. 2089 */ 2090 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 2091 gfp_t priority) 2092 { 2093 if (force || 2094 refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) { 2095 struct sk_buff *skb = alloc_skb(size, priority); 2096 2097 if (skb) { 2098 skb_set_owner_w(skb, sk); 2099 return skb; 2100 } 2101 } 2102 return NULL; 2103 } 2104 EXPORT_SYMBOL(sock_wmalloc); 2105 2106 static void sock_ofree(struct sk_buff *skb) 2107 { 2108 struct sock *sk = skb->sk; 2109 2110 atomic_sub(skb->truesize, &sk->sk_omem_alloc); 2111 } 2112 2113 struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, 2114 gfp_t priority) 2115 { 2116 struct sk_buff *skb; 2117 2118 /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ 2119 if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > 2120 sysctl_optmem_max) 2121 return NULL; 2122 2123 skb = alloc_skb(size, priority); 2124 if (!skb) 2125 return NULL; 2126 2127 atomic_add(skb->truesize, &sk->sk_omem_alloc); 2128 skb->sk = sk; 2129 skb->destructor = sock_ofree; 2130 return skb; 2131 } 2132 2133 /* 2134 * Allocate a memory block from the socket's option memory buffer. 2135 */ 2136 void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 2137 { 2138 if ((unsigned int)size <= sysctl_optmem_max && 2139 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 2140 void *mem; 2141 /* First do the add, to avoid the race if kmalloc 2142 * might sleep. 2143 */ 2144 atomic_add(size, &sk->sk_omem_alloc); 2145 mem = kmalloc(size, priority); 2146 if (mem) 2147 return mem; 2148 atomic_sub(size, &sk->sk_omem_alloc); 2149 } 2150 return NULL; 2151 } 2152 EXPORT_SYMBOL(sock_kmalloc); 2153 2154 /* Free an option memory block. Note, we actually want the inline 2155 * here as this allows gcc to detect the nullify and fold away the 2156 * condition entirely. 2157 */ 2158 static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, 2159 const bool nullify) 2160 { 2161 if (WARN_ON_ONCE(!mem)) 2162 return; 2163 if (nullify) 2164 kzfree(mem); 2165 else 2166 kfree(mem); 2167 atomic_sub(size, &sk->sk_omem_alloc); 2168 } 2169 2170 void sock_kfree_s(struct sock *sk, void *mem, int size) 2171 { 2172 __sock_kfree_s(sk, mem, size, false); 2173 } 2174 EXPORT_SYMBOL(sock_kfree_s); 2175 2176 void sock_kzfree_s(struct sock *sk, void *mem, int size) 2177 { 2178 __sock_kfree_s(sk, mem, size, true); 2179 } 2180 EXPORT_SYMBOL(sock_kzfree_s); 2181 2182 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 2183 I think, these locks should be removed for datagram sockets. 2184 */ 2185 static long sock_wait_for_wmem(struct sock *sk, long timeo) 2186 { 2187 DEFINE_WAIT(wait); 2188 2189 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2190 for (;;) { 2191 if (!timeo) 2192 break; 2193 if (signal_pending(current)) 2194 break; 2195 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2196 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 2197 if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) 2198 break; 2199 if (sk->sk_shutdown & SEND_SHUTDOWN) 2200 break; 2201 if (sk->sk_err) 2202 break; 2203 timeo = schedule_timeout(timeo); 2204 } 2205 finish_wait(sk_sleep(sk), &wait); 2206 return timeo; 2207 } 2208 2209 2210 /* 2211 * Generic send/receive buffer handlers 2212 */ 2213 2214 struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 2215 unsigned long data_len, int noblock, 2216 int *errcode, int max_page_order) 2217 { 2218 struct sk_buff *skb; 2219 long timeo; 2220 int err; 2221 2222 timeo = sock_sndtimeo(sk, noblock); 2223 for (;;) { 2224 err = sock_error(sk); 2225 if (err != 0) 2226 goto failure; 2227 2228 err = -EPIPE; 2229 if (sk->sk_shutdown & SEND_SHUTDOWN) 2230 goto failure; 2231 2232 if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf)) 2233 break; 2234 2235 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 2236 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 2237 err = -EAGAIN; 2238 if (!timeo) 2239 goto failure; 2240 if (signal_pending(current)) 2241 goto interrupted; 2242 timeo = sock_wait_for_wmem(sk, timeo); 2243 } 2244 skb = alloc_skb_with_frags(header_len, data_len, max_page_order, 2245 errcode, sk->sk_allocation); 2246 if (skb) 2247 skb_set_owner_w(skb, sk); 2248 return skb; 2249 2250 interrupted: 2251 err = sock_intr_errno(timeo); 2252 failure: 2253 *errcode = err; 2254 return NULL; 2255 } 2256 EXPORT_SYMBOL(sock_alloc_send_pskb); 2257 2258 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 2259 int noblock, int *errcode) 2260 { 2261 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); 2262 } 2263 EXPORT_SYMBOL(sock_alloc_send_skb); 2264 2265 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, 2266 struct sockcm_cookie *sockc) 2267 { 2268 u32 tsflags; 2269 2270 switch (cmsg->cmsg_type) { 2271 case SO_MARK: 2272 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 2273 return -EPERM; 2274 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2275 return -EINVAL; 2276 sockc->mark = *(u32 *)CMSG_DATA(cmsg); 2277 break; 2278 case SO_TIMESTAMPING_OLD: 2279 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) 2280 return -EINVAL; 2281 2282 tsflags = *(u32 *)CMSG_DATA(cmsg); 2283 if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) 2284 return -EINVAL; 2285 2286 sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; 2287 sockc->tsflags |= tsflags; 2288 break; 2289 case SCM_TXTIME: 2290 if (!sock_flag(sk, SOCK_TXTIME)) 2291 return -EINVAL; 2292 if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64))) 2293 return -EINVAL; 2294 sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg)); 2295 break; 2296 /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ 2297 case SCM_RIGHTS: 2298 case SCM_CREDENTIALS: 2299 break; 2300 default: 2301 return -EINVAL; 2302 } 2303 return 0; 2304 } 2305 EXPORT_SYMBOL(__sock_cmsg_send); 2306 2307 int sock_cmsg_send(struct sock *sk, struct msghdr *msg, 2308 struct sockcm_cookie *sockc) 2309 { 2310 struct cmsghdr *cmsg; 2311 int ret; 2312 2313 for_each_cmsghdr(cmsg, msg) { 2314 if (!CMSG_OK(msg, cmsg)) 2315 return -EINVAL; 2316 if (cmsg->cmsg_level != SOL_SOCKET) 2317 continue; 2318 ret = __sock_cmsg_send(sk, msg, cmsg, sockc); 2319 if (ret) 2320 return ret; 2321 } 2322 return 0; 2323 } 2324 EXPORT_SYMBOL(sock_cmsg_send); 2325 2326 static void sk_enter_memory_pressure(struct sock *sk) 2327 { 2328 if (!sk->sk_prot->enter_memory_pressure) 2329 return; 2330 2331 sk->sk_prot->enter_memory_pressure(sk); 2332 } 2333 2334 static void sk_leave_memory_pressure(struct sock *sk) 2335 { 2336 if (sk->sk_prot->leave_memory_pressure) { 2337 sk->sk_prot->leave_memory_pressure(sk); 2338 } else { 2339 unsigned long *memory_pressure = sk->sk_prot->memory_pressure; 2340 2341 if (memory_pressure && READ_ONCE(*memory_pressure)) 2342 WRITE_ONCE(*memory_pressure, 0); 2343 } 2344 } 2345 2346 /* On 32bit arches, an skb frag is limited to 2^15 */ 2347 #define SKB_FRAG_PAGE_ORDER get_order(32768) 2348 DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key); 2349 2350 /** 2351 * skb_page_frag_refill - check that a page_frag contains enough room 2352 * @sz: minimum size of the fragment we want to get 2353 * @pfrag: pointer to page_frag 2354 * @gfp: priority for memory allocation 2355 * 2356 * Note: While this allocator tries to use high order pages, there is 2357 * no guarantee that allocations succeed. Therefore, @sz MUST be 2358 * less or equal than PAGE_SIZE. 2359 */ 2360 bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) 2361 { 2362 if (pfrag->page) { 2363 if (page_ref_count(pfrag->page) == 1) { 2364 pfrag->offset = 0; 2365 return true; 2366 } 2367 if (pfrag->offset + sz <= pfrag->size) 2368 return true; 2369 put_page(pfrag->page); 2370 } 2371 2372 pfrag->offset = 0; 2373 if (SKB_FRAG_PAGE_ORDER && 2374 !static_branch_unlikely(&net_high_order_alloc_disable_key)) { 2375 /* Avoid direct reclaim but allow kswapd to wake */ 2376 pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | 2377 __GFP_COMP | __GFP_NOWARN | 2378 __GFP_NORETRY, 2379 SKB_FRAG_PAGE_ORDER); 2380 if (likely(pfrag->page)) { 2381 pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; 2382 return true; 2383 } 2384 } 2385 pfrag->page = alloc_page(gfp); 2386 if (likely(pfrag->page)) { 2387 pfrag->size = PAGE_SIZE; 2388 return true; 2389 } 2390 return false; 2391 } 2392 EXPORT_SYMBOL(skb_page_frag_refill); 2393 2394 bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) 2395 { 2396 if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) 2397 return true; 2398 2399 sk_enter_memory_pressure(sk); 2400 sk_stream_moderate_sndbuf(sk); 2401 return false; 2402 } 2403 EXPORT_SYMBOL(sk_page_frag_refill); 2404 2405 static void __lock_sock(struct sock *sk) 2406 __releases(&sk->sk_lock.slock) 2407 __acquires(&sk->sk_lock.slock) 2408 { 2409 DEFINE_WAIT(wait); 2410 2411 for (;;) { 2412 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 2413 TASK_UNINTERRUPTIBLE); 2414 spin_unlock_bh(&sk->sk_lock.slock); 2415 schedule(); 2416 spin_lock_bh(&sk->sk_lock.slock); 2417 if (!sock_owned_by_user(sk)) 2418 break; 2419 } 2420 finish_wait(&sk->sk_lock.wq, &wait); 2421 } 2422 2423 void __release_sock(struct sock *sk) 2424 __releases(&sk->sk_lock.slock) 2425 __acquires(&sk->sk_lock.slock) 2426 { 2427 struct sk_buff *skb, *next; 2428 2429 while ((skb = sk->sk_backlog.head) != NULL) { 2430 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 2431 2432 spin_unlock_bh(&sk->sk_lock.slock); 2433 2434 do { 2435 next = skb->next; 2436 prefetch(next); 2437 WARN_ON_ONCE(skb_dst_is_noref(skb)); 2438 skb_mark_not_on_list(skb); 2439 sk_backlog_rcv(sk, skb); 2440 2441 cond_resched(); 2442 2443 skb = next; 2444 } while (skb != NULL); 2445 2446 spin_lock_bh(&sk->sk_lock.slock); 2447 } 2448 2449 /* 2450 * Doing the zeroing here guarantee we can not loop forever 2451 * while a wild producer attempts to flood us. 2452 */ 2453 sk->sk_backlog.len = 0; 2454 } 2455 2456 void __sk_flush_backlog(struct sock *sk) 2457 { 2458 spin_lock_bh(&sk->sk_lock.slock); 2459 __release_sock(sk); 2460 spin_unlock_bh(&sk->sk_lock.slock); 2461 } 2462 2463 /** 2464 * sk_wait_data - wait for data to arrive at sk_receive_queue 2465 * @sk: sock to wait on 2466 * @timeo: for how long 2467 * @skb: last skb seen on sk_receive_queue 2468 * 2469 * Now socket state including sk->sk_err is changed only under lock, 2470 * hence we may omit checks after joining wait queue. 2471 * We check receive queue before schedule() only as optimization; 2472 * it is very likely that release_sock() added new data. 2473 */ 2474 int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) 2475 { 2476 DEFINE_WAIT_FUNC(wait, woken_wake_function); 2477 int rc; 2478 2479 add_wait_queue(sk_sleep(sk), &wait); 2480 sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2481 rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); 2482 sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); 2483 remove_wait_queue(sk_sleep(sk), &wait); 2484 return rc; 2485 } 2486 EXPORT_SYMBOL(sk_wait_data); 2487 2488 /** 2489 * __sk_mem_raise_allocated - increase memory_allocated 2490 * @sk: socket 2491 * @size: memory size to allocate 2492 * @amt: pages to allocate 2493 * @kind: allocation type 2494 * 2495 * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc 2496 */ 2497 int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) 2498 { 2499 struct proto *prot = sk->sk_prot; 2500 long allocated = sk_memory_allocated_add(sk, amt); 2501 bool charged = true; 2502 2503 if (mem_cgroup_sockets_enabled && sk->sk_memcg && 2504 !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt))) 2505 goto suppress_allocation; 2506 2507 /* Under limit. */ 2508 if (allocated <= sk_prot_mem_limits(sk, 0)) { 2509 sk_leave_memory_pressure(sk); 2510 return 1; 2511 } 2512 2513 /* Under pressure. */ 2514 if (allocated > sk_prot_mem_limits(sk, 1)) 2515 sk_enter_memory_pressure(sk); 2516 2517 /* Over hard limit. */ 2518 if (allocated > sk_prot_mem_limits(sk, 2)) 2519 goto suppress_allocation; 2520 2521 /* guarantee minimum buffer size under pressure */ 2522 if (kind == SK_MEM_RECV) { 2523 if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot)) 2524 return 1; 2525 2526 } else { /* SK_MEM_SEND */ 2527 int wmem0 = sk_get_wmem0(sk, prot); 2528 2529 if (sk->sk_type == SOCK_STREAM) { 2530 if (sk->sk_wmem_queued < wmem0) 2531 return 1; 2532 } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) { 2533 return 1; 2534 } 2535 } 2536 2537 if (sk_has_memory_pressure(sk)) { 2538 u64 alloc; 2539 2540 if (!sk_under_memory_pressure(sk)) 2541 return 1; 2542 alloc = sk_sockets_allocated_read_positive(sk); 2543 if (sk_prot_mem_limits(sk, 2) > alloc * 2544 sk_mem_pages(sk->sk_wmem_queued + 2545 atomic_read(&sk->sk_rmem_alloc) + 2546 sk->sk_forward_alloc)) 2547 return 1; 2548 } 2549 2550 suppress_allocation: 2551 2552 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 2553 sk_stream_moderate_sndbuf(sk); 2554 2555 /* Fail only if socket is _under_ its sndbuf. 2556 * In this case we cannot block, so that we have to fail. 2557 */ 2558 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 2559 return 1; 2560 } 2561 2562 if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged)) 2563 trace_sock_exceed_buf_limit(sk, prot, allocated, kind); 2564 2565 sk_memory_allocated_sub(sk, amt); 2566 2567 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2568 mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); 2569 2570 return 0; 2571 } 2572 EXPORT_SYMBOL(__sk_mem_raise_allocated); 2573 2574 /** 2575 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 2576 * @sk: socket 2577 * @size: memory size to allocate 2578 * @kind: allocation type 2579 * 2580 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 2581 * rmem allocation. This function assumes that protocols which have 2582 * memory_pressure use sk_wmem_queued as write buffer accounting. 2583 */ 2584 int __sk_mem_schedule(struct sock *sk, int size, int kind) 2585 { 2586 int ret, amt = sk_mem_pages(size); 2587 2588 sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; 2589 ret = __sk_mem_raise_allocated(sk, size, amt, kind); 2590 if (!ret) 2591 sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; 2592 return ret; 2593 } 2594 EXPORT_SYMBOL(__sk_mem_schedule); 2595 2596 /** 2597 * __sk_mem_reduce_allocated - reclaim memory_allocated 2598 * @sk: socket 2599 * @amount: number of quanta 2600 * 2601 * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc 2602 */ 2603 void __sk_mem_reduce_allocated(struct sock *sk, int amount) 2604 { 2605 sk_memory_allocated_sub(sk, amount); 2606 2607 if (mem_cgroup_sockets_enabled && sk->sk_memcg) 2608 mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); 2609 2610 if (sk_under_memory_pressure(sk) && 2611 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) 2612 sk_leave_memory_pressure(sk); 2613 } 2614 EXPORT_SYMBOL(__sk_mem_reduce_allocated); 2615 2616 /** 2617 * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated 2618 * @sk: socket 2619 * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) 2620 */ 2621 void __sk_mem_reclaim(struct sock *sk, int amount) 2622 { 2623 amount >>= SK_MEM_QUANTUM_SHIFT; 2624 sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; 2625 __sk_mem_reduce_allocated(sk, amount); 2626 } 2627 EXPORT_SYMBOL(__sk_mem_reclaim); 2628 2629 int sk_set_peek_off(struct sock *sk, int val) 2630 { 2631 sk->sk_peek_off = val; 2632 return 0; 2633 } 2634 EXPORT_SYMBOL_GPL(sk_set_peek_off); 2635 2636 /* 2637 * Set of default routines for initialising struct proto_ops when 2638 * the protocol does not support a particular function. In certain 2639 * cases where it makes no sense for a protocol to have a "do nothing" 2640 * function, some default processing is provided. 2641 */ 2642 2643 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 2644 { 2645 return -EOPNOTSUPP; 2646 } 2647 EXPORT_SYMBOL(sock_no_bind); 2648 2649 int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 2650 int len, int flags) 2651 { 2652 return -EOPNOTSUPP; 2653 } 2654 EXPORT_SYMBOL(sock_no_connect); 2655 2656 int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 2657 { 2658 return -EOPNOTSUPP; 2659 } 2660 EXPORT_SYMBOL(sock_no_socketpair); 2661 2662 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, 2663 bool kern) 2664 { 2665 return -EOPNOTSUPP; 2666 } 2667 EXPORT_SYMBOL(sock_no_accept); 2668 2669 int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 2670 int peer) 2671 { 2672 return -EOPNOTSUPP; 2673 } 2674 EXPORT_SYMBOL(sock_no_getname); 2675 2676 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 2677 { 2678 return -EOPNOTSUPP; 2679 } 2680 EXPORT_SYMBOL(sock_no_ioctl); 2681 2682 int sock_no_listen(struct socket *sock, int backlog) 2683 { 2684 return -EOPNOTSUPP; 2685 } 2686 EXPORT_SYMBOL(sock_no_listen); 2687 2688 int sock_no_shutdown(struct socket *sock, int how) 2689 { 2690 return -EOPNOTSUPP; 2691 } 2692 EXPORT_SYMBOL(sock_no_shutdown); 2693 2694 int sock_no_setsockopt(struct socket *sock, int level, int optname, 2695 char __user *optval, unsigned int optlen) 2696 { 2697 return -EOPNOTSUPP; 2698 } 2699 EXPORT_SYMBOL(sock_no_setsockopt); 2700 2701 int sock_no_getsockopt(struct socket *sock, int level, int optname, 2702 char __user *optval, int __user *optlen) 2703 { 2704 return -EOPNOTSUPP; 2705 } 2706 EXPORT_SYMBOL(sock_no_getsockopt); 2707 2708 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) 2709 { 2710 return -EOPNOTSUPP; 2711 } 2712 EXPORT_SYMBOL(sock_no_sendmsg); 2713 2714 int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) 2715 { 2716 return -EOPNOTSUPP; 2717 } 2718 EXPORT_SYMBOL(sock_no_sendmsg_locked); 2719 2720 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, 2721 int flags) 2722 { 2723 return -EOPNOTSUPP; 2724 } 2725 EXPORT_SYMBOL(sock_no_recvmsg); 2726 2727 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 2728 { 2729 /* Mirror missing mmap method error code */ 2730 return -ENODEV; 2731 } 2732 EXPORT_SYMBOL(sock_no_mmap); 2733 2734 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 2735 { 2736 ssize_t res; 2737 struct msghdr msg = {.msg_flags = flags}; 2738 struct kvec iov; 2739 char *kaddr = kmap(page); 2740 iov.iov_base = kaddr + offset; 2741 iov.iov_len = size; 2742 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 2743 kunmap(page); 2744 return res; 2745 } 2746 EXPORT_SYMBOL(sock_no_sendpage); 2747 2748 ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, 2749 int offset, size_t size, int flags) 2750 { 2751 ssize_t res; 2752 struct msghdr msg = {.msg_flags = flags}; 2753 struct kvec iov; 2754 char *kaddr = kmap(page); 2755 2756 iov.iov_base = kaddr + offset; 2757 iov.iov_len = size; 2758 res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); 2759 kunmap(page); 2760 return res; 2761 } 2762 EXPORT_SYMBOL(sock_no_sendpage_locked); 2763 2764 /* 2765 * Default Socket Callbacks 2766 */ 2767 2768 static void sock_def_wakeup(struct sock *sk) 2769 { 2770 struct socket_wq *wq; 2771 2772 rcu_read_lock(); 2773 wq = rcu_dereference(sk->sk_wq); 2774 if (skwq_has_sleeper(wq)) 2775 wake_up_interruptible_all(&wq->wait); 2776 rcu_read_unlock(); 2777 } 2778 2779 static void sock_def_error_report(struct sock *sk) 2780 { 2781 struct socket_wq *wq; 2782 2783 rcu_read_lock(); 2784 wq = rcu_dereference(sk->sk_wq); 2785 if (skwq_has_sleeper(wq)) 2786 wake_up_interruptible_poll(&wq->wait, EPOLLERR); 2787 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 2788 rcu_read_unlock(); 2789 } 2790 2791 static void sock_def_readable(struct sock *sk) 2792 { 2793 struct socket_wq *wq; 2794 2795 rcu_read_lock(); 2796 wq = rcu_dereference(sk->sk_wq); 2797 if (skwq_has_sleeper(wq)) 2798 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI | 2799 EPOLLRDNORM | EPOLLRDBAND); 2800 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 2801 rcu_read_unlock(); 2802 } 2803 2804 static void sock_def_write_space(struct sock *sk) 2805 { 2806 struct socket_wq *wq; 2807 2808 rcu_read_lock(); 2809 2810 /* Do not wake up a writer until he can make "significant" 2811 * progress. --DaveM 2812 */ 2813 if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) { 2814 wq = rcu_dereference(sk->sk_wq); 2815 if (skwq_has_sleeper(wq)) 2816 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | 2817 EPOLLWRNORM | EPOLLWRBAND); 2818 2819 /* Should agree with poll, otherwise some programs break */ 2820 if (sock_writeable(sk)) 2821 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 2822 } 2823 2824 rcu_read_unlock(); 2825 } 2826 2827 static void sock_def_destruct(struct sock *sk) 2828 { 2829 } 2830 2831 void sk_send_sigurg(struct sock *sk) 2832 { 2833 if (sk->sk_socket && sk->sk_socket->file) 2834 if (send_sigurg(&sk->sk_socket->file->f_owner)) 2835 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 2836 } 2837 EXPORT_SYMBOL(sk_send_sigurg); 2838 2839 void sk_reset_timer(struct sock *sk, struct timer_list* timer, 2840 unsigned long expires) 2841 { 2842 if (!mod_timer(timer, expires)) 2843 sock_hold(sk); 2844 } 2845 EXPORT_SYMBOL(sk_reset_timer); 2846 2847 void sk_stop_timer(struct sock *sk, struct timer_list* timer) 2848 { 2849 if (del_timer(timer)) 2850 __sock_put(sk); 2851 } 2852 EXPORT_SYMBOL(sk_stop_timer); 2853 2854 void sock_init_data(struct socket *sock, struct sock *sk) 2855 { 2856 sk_init_common(sk); 2857 sk->sk_send_head = NULL; 2858 2859 timer_setup(&sk->sk_timer, NULL, 0); 2860 2861 sk->sk_allocation = GFP_KERNEL; 2862 sk->sk_rcvbuf = sysctl_rmem_default; 2863 sk->sk_sndbuf = sysctl_wmem_default; 2864 sk->sk_state = TCP_CLOSE; 2865 sk_set_socket(sk, sock); 2866 2867 sock_set_flag(sk, SOCK_ZAPPED); 2868 2869 if (sock) { 2870 sk->sk_type = sock->type; 2871 RCU_INIT_POINTER(sk->sk_wq, &sock->wq); 2872 sock->sk = sk; 2873 sk->sk_uid = SOCK_INODE(sock)->i_uid; 2874 } else { 2875 RCU_INIT_POINTER(sk->sk_wq, NULL); 2876 sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); 2877 } 2878 2879 rwlock_init(&sk->sk_callback_lock); 2880 if (sk->sk_kern_sock) 2881 lockdep_set_class_and_name( 2882 &sk->sk_callback_lock, 2883 af_kern_callback_keys + sk->sk_family, 2884 af_family_kern_clock_key_strings[sk->sk_family]); 2885 else 2886 lockdep_set_class_and_name( 2887 &sk->sk_callback_lock, 2888 af_callback_keys + sk->sk_family, 2889 af_family_clock_key_strings[sk->sk_family]); 2890 2891 sk->sk_state_change = sock_def_wakeup; 2892 sk->sk_data_ready = sock_def_readable; 2893 sk->sk_write_space = sock_def_write_space; 2894 sk->sk_error_report = sock_def_error_report; 2895 sk->sk_destruct = sock_def_destruct; 2896 2897 sk->sk_frag.page = NULL; 2898 sk->sk_frag.offset = 0; 2899 sk->sk_peek_off = -1; 2900 2901 sk->sk_peer_pid = NULL; 2902 sk->sk_peer_cred = NULL; 2903 sk->sk_write_pending = 0; 2904 sk->sk_rcvlowat = 1; 2905 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2906 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2907 2908 sk->sk_stamp = SK_DEFAULT_STAMP; 2909 #if BITS_PER_LONG==32 2910 seqlock_init(&sk->sk_stamp_seq); 2911 #endif 2912 atomic_set(&sk->sk_zckey, 0); 2913 2914 #ifdef CONFIG_NET_RX_BUSY_POLL 2915 sk->sk_napi_id = 0; 2916 sk->sk_ll_usec = sysctl_net_busy_read; 2917 #endif 2918 2919 sk->sk_max_pacing_rate = ~0UL; 2920 sk->sk_pacing_rate = ~0UL; 2921 sk->sk_pacing_shift = 10; 2922 sk->sk_incoming_cpu = -1; 2923 2924 sk_rx_queue_clear(sk); 2925 /* 2926 * Before updating sk_refcnt, we must commit prior changes to memory 2927 * (Documentation/RCU/rculist_nulls.txt for details) 2928 */ 2929 smp_wmb(); 2930 refcount_set(&sk->sk_refcnt, 1); 2931 atomic_set(&sk->sk_drops, 0); 2932 } 2933 EXPORT_SYMBOL(sock_init_data); 2934 2935 void lock_sock_nested(struct sock *sk, int subclass) 2936 { 2937 might_sleep(); 2938 spin_lock_bh(&sk->sk_lock.slock); 2939 if (sk->sk_lock.owned) 2940 __lock_sock(sk); 2941 sk->sk_lock.owned = 1; 2942 spin_unlock(&sk->sk_lock.slock); 2943 /* 2944 * The sk_lock has mutex_lock() semantics here: 2945 */ 2946 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2947 local_bh_enable(); 2948 } 2949 EXPORT_SYMBOL(lock_sock_nested); 2950 2951 void release_sock(struct sock *sk) 2952 { 2953 spin_lock_bh(&sk->sk_lock.slock); 2954 if (sk->sk_backlog.tail) 2955 __release_sock(sk); 2956 2957 /* Warning : release_cb() might need to release sk ownership, 2958 * ie call sock_release_ownership(sk) before us. 2959 */ 2960 if (sk->sk_prot->release_cb) 2961 sk->sk_prot->release_cb(sk); 2962 2963 sock_release_ownership(sk); 2964 if (waitqueue_active(&sk->sk_lock.wq)) 2965 wake_up(&sk->sk_lock.wq); 2966 spin_unlock_bh(&sk->sk_lock.slock); 2967 } 2968 EXPORT_SYMBOL(release_sock); 2969 2970 /** 2971 * lock_sock_fast - fast version of lock_sock 2972 * @sk: socket 2973 * 2974 * This version should be used for very small section, where process wont block 2975 * return false if fast path is taken: 2976 * 2977 * sk_lock.slock locked, owned = 0, BH disabled 2978 * 2979 * return true if slow path is taken: 2980 * 2981 * sk_lock.slock unlocked, owned = 1, BH enabled 2982 */ 2983 bool lock_sock_fast(struct sock *sk) 2984 { 2985 might_sleep(); 2986 spin_lock_bh(&sk->sk_lock.slock); 2987 2988 if (!sk->sk_lock.owned) 2989 /* 2990 * Note : We must disable BH 2991 */ 2992 return false; 2993 2994 __lock_sock(sk); 2995 sk->sk_lock.owned = 1; 2996 spin_unlock(&sk->sk_lock.slock); 2997 /* 2998 * The sk_lock has mutex_lock() semantics here: 2999 */ 3000 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 3001 local_bh_enable(); 3002 return true; 3003 } 3004 EXPORT_SYMBOL(lock_sock_fast); 3005 3006 int sock_gettstamp(struct socket *sock, void __user *userstamp, 3007 bool timeval, bool time32) 3008 { 3009 struct sock *sk = sock->sk; 3010 struct timespec64 ts; 3011 3012 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 3013 ts = ktime_to_timespec64(sock_read_timestamp(sk)); 3014 if (ts.tv_sec == -1) 3015 return -ENOENT; 3016 if (ts.tv_sec == 0) { 3017 ktime_t kt = ktime_get_real(); 3018 sock_write_timestamp(sk, kt);; 3019 ts = ktime_to_timespec64(kt); 3020 } 3021 3022 if (timeval) 3023 ts.tv_nsec /= 1000; 3024 3025 #ifdef CONFIG_COMPAT_32BIT_TIME 3026 if (time32) 3027 return put_old_timespec32(&ts, userstamp); 3028 #endif 3029 #ifdef CONFIG_SPARC64 3030 /* beware of padding in sparc64 timeval */ 3031 if (timeval && !in_compat_syscall()) { 3032 struct __kernel_old_timeval __user tv = { 3033 .tv_sec = ts.tv_sec, 3034 .tv_usec = ts.tv_nsec, 3035 }; 3036 if (copy_to_user(userstamp, &tv, sizeof(tv))) 3037 return -EFAULT; 3038 return 0; 3039 } 3040 #endif 3041 return put_timespec64(&ts, userstamp); 3042 } 3043 EXPORT_SYMBOL(sock_gettstamp); 3044 3045 void sock_enable_timestamp(struct sock *sk, int flag) 3046 { 3047 if (!sock_flag(sk, flag)) { 3048 unsigned long previous_flags = sk->sk_flags; 3049 3050 sock_set_flag(sk, flag); 3051 /* 3052 * we just set one of the two flags which require net 3053 * time stamping, but time stamping might have been on 3054 * already because of the other one 3055 */ 3056 if (sock_needs_netstamp(sk) && 3057 !(previous_flags & SK_FLAGS_TIMESTAMP)) 3058 net_enable_timestamp(); 3059 } 3060 } 3061 3062 int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, 3063 int level, int type) 3064 { 3065 struct sock_exterr_skb *serr; 3066 struct sk_buff *skb; 3067 int copied, err; 3068 3069 err = -EAGAIN; 3070 skb = sock_dequeue_err_skb(sk); 3071 if (skb == NULL) 3072 goto out; 3073 3074 copied = skb->len; 3075 if (copied > len) { 3076 msg->msg_flags |= MSG_TRUNC; 3077 copied = len; 3078 } 3079 err = skb_copy_datagram_msg(skb, 0, msg, copied); 3080 if (err) 3081 goto out_free_skb; 3082 3083 sock_recv_timestamp(msg, sk, skb); 3084 3085 serr = SKB_EXT_ERR(skb); 3086 put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); 3087 3088 msg->msg_flags |= MSG_ERRQUEUE; 3089 err = copied; 3090 3091 out_free_skb: 3092 kfree_skb(skb); 3093 out: 3094 return err; 3095 } 3096 EXPORT_SYMBOL(sock_recv_errqueue); 3097 3098 /* 3099 * Get a socket option on an socket. 3100 * 3101 * FIX: POSIX 1003.1g is very ambiguous here. It states that 3102 * asynchronous errors should be reported by getsockopt. We assume 3103 * this means if you specify SO_ERROR (otherwise whats the point of it). 3104 */ 3105 int sock_common_getsockopt(struct socket *sock, int level, int optname, 3106 char __user *optval, int __user *optlen) 3107 { 3108 struct sock *sk = sock->sk; 3109 3110 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 3111 } 3112 EXPORT_SYMBOL(sock_common_getsockopt); 3113 3114 #ifdef CONFIG_COMPAT 3115 int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 3116 char __user *optval, int __user *optlen) 3117 { 3118 struct sock *sk = sock->sk; 3119 3120 if (sk->sk_prot->compat_getsockopt != NULL) 3121 return sk->sk_prot->compat_getsockopt(sk, level, optname, 3122 optval, optlen); 3123 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 3124 } 3125 EXPORT_SYMBOL(compat_sock_common_getsockopt); 3126 #endif 3127 3128 int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 3129 int flags) 3130 { 3131 struct sock *sk = sock->sk; 3132 int addr_len = 0; 3133 int err; 3134 3135 err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, 3136 flags & ~MSG_DONTWAIT, &addr_len); 3137 if (err >= 0) 3138 msg->msg_namelen = addr_len; 3139 return err; 3140 } 3141 EXPORT_SYMBOL(sock_common_recvmsg); 3142 3143 /* 3144 * Set socket options on an inet socket. 3145 */ 3146 int sock_common_setsockopt(struct socket *sock, int level, int optname, 3147 char __user *optval, unsigned int optlen) 3148 { 3149 struct sock *sk = sock->sk; 3150 3151 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 3152 } 3153 EXPORT_SYMBOL(sock_common_setsockopt); 3154 3155 #ifdef CONFIG_COMPAT 3156 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 3157 char __user *optval, unsigned int optlen) 3158 { 3159 struct sock *sk = sock->sk; 3160 3161 if (sk->sk_prot->compat_setsockopt != NULL) 3162 return sk->sk_prot->compat_setsockopt(sk, level, optname, 3163 optval, optlen); 3164 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 3165 } 3166 EXPORT_SYMBOL(compat_sock_common_setsockopt); 3167 #endif 3168 3169 void sk_common_release(struct sock *sk) 3170 { 3171 if (sk->sk_prot->destroy) 3172 sk->sk_prot->destroy(sk); 3173 3174 /* 3175 * Observation: when sock_common_release is called, processes have 3176 * no access to socket. But net still has. 3177 * Step one, detach it from networking: 3178 * 3179 * A. Remove from hash tables. 3180 */ 3181 3182 sk->sk_prot->unhash(sk); 3183 3184 /* 3185 * In this point socket cannot receive new packets, but it is possible 3186 * that some packets are in flight because some CPU runs receiver and 3187 * did hash table lookup before we unhashed socket. They will achieve 3188 * receive queue and will be purged by socket destructor. 3189 * 3190 * Also we still have packets pending on receive queue and probably, 3191 * our own packets waiting in device queues. sock_destroy will drain 3192 * receive queue, but transmitted packets will delay socket destruction 3193 * until the last reference will be released. 3194 */ 3195 3196 sock_orphan(sk); 3197 3198 xfrm_sk_free_policy(sk); 3199 3200 sk_refcnt_debug_release(sk); 3201 3202 sock_put(sk); 3203 } 3204 EXPORT_SYMBOL(sk_common_release); 3205 3206 void sk_get_meminfo(const struct sock *sk, u32 *mem) 3207 { 3208 memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); 3209 3210 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 3211 mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf); 3212 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 3213 mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf); 3214 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 3215 mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued); 3216 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 3217 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len); 3218 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); 3219 } 3220 3221 #ifdef CONFIG_PROC_FS 3222 #define PROTO_INUSE_NR 64 /* should be enough for the first time */ 3223 struct prot_inuse { 3224 int val[PROTO_INUSE_NR]; 3225 }; 3226 3227 static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 3228 3229 void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 3230 { 3231 __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val); 3232 } 3233 EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 3234 3235 int sock_prot_inuse_get(struct net *net, struct proto *prot) 3236 { 3237 int cpu, idx = prot->inuse_idx; 3238 int res = 0; 3239 3240 for_each_possible_cpu(cpu) 3241 res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx]; 3242 3243 return res >= 0 ? res : 0; 3244 } 3245 EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 3246 3247 static void sock_inuse_add(struct net *net, int val) 3248 { 3249 this_cpu_add(*net->core.sock_inuse, val); 3250 } 3251 3252 int sock_inuse_get(struct net *net) 3253 { 3254 int cpu, res = 0; 3255 3256 for_each_possible_cpu(cpu) 3257 res += *per_cpu_ptr(net->core.sock_inuse, cpu); 3258 3259 return res; 3260 } 3261 3262 EXPORT_SYMBOL_GPL(sock_inuse_get); 3263 3264 static int __net_init sock_inuse_init_net(struct net *net) 3265 { 3266 net->core.prot_inuse = alloc_percpu(struct prot_inuse); 3267 if (net->core.prot_inuse == NULL) 3268 return -ENOMEM; 3269 3270 net->core.sock_inuse = alloc_percpu(int); 3271 if (net->core.sock_inuse == NULL) 3272 goto out; 3273 3274 return 0; 3275 3276 out: 3277 free_percpu(net->core.prot_inuse); 3278 return -ENOMEM; 3279 } 3280 3281 static void __net_exit sock_inuse_exit_net(struct net *net) 3282 { 3283 free_percpu(net->core.prot_inuse); 3284 free_percpu(net->core.sock_inuse); 3285 } 3286 3287 static struct pernet_operations net_inuse_ops = { 3288 .init = sock_inuse_init_net, 3289 .exit = sock_inuse_exit_net, 3290 }; 3291 3292 static __init int net_inuse_init(void) 3293 { 3294 if (register_pernet_subsys(&net_inuse_ops)) 3295 panic("Cannot initialize net inuse counters"); 3296 3297 return 0; 3298 } 3299 3300 core_initcall(net_inuse_init); 3301 3302 static int assign_proto_idx(struct proto *prot) 3303 { 3304 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 3305 3306 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 3307 pr_err("PROTO_INUSE_NR exhausted\n"); 3308 return -ENOSPC; 3309 } 3310 3311 set_bit(prot->inuse_idx, proto_inuse_idx); 3312 return 0; 3313 } 3314 3315 static void release_proto_idx(struct proto *prot) 3316 { 3317 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 3318 clear_bit(prot->inuse_idx, proto_inuse_idx); 3319 } 3320 #else 3321 static inline int assign_proto_idx(struct proto *prot) 3322 { 3323 return 0; 3324 } 3325 3326 static inline void release_proto_idx(struct proto *prot) 3327 { 3328 } 3329 3330 static void sock_inuse_add(struct net *net, int val) 3331 { 3332 } 3333 #endif 3334 3335 static void req_prot_cleanup(struct request_sock_ops *rsk_prot) 3336 { 3337 if (!rsk_prot) 3338 return; 3339 kfree(rsk_prot->slab_name); 3340 rsk_prot->slab_name = NULL; 3341 kmem_cache_destroy(rsk_prot->slab); 3342 rsk_prot->slab = NULL; 3343 } 3344 3345 static int req_prot_init(const struct proto *prot) 3346 { 3347 struct request_sock_ops *rsk_prot = prot->rsk_prot; 3348 3349 if (!rsk_prot) 3350 return 0; 3351 3352 rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", 3353 prot->name); 3354 if (!rsk_prot->slab_name) 3355 return -ENOMEM; 3356 3357 rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, 3358 rsk_prot->obj_size, 0, 3359 SLAB_ACCOUNT | prot->slab_flags, 3360 NULL); 3361 3362 if (!rsk_prot->slab) { 3363 pr_crit("%s: Can't create request sock SLAB cache!\n", 3364 prot->name); 3365 return -ENOMEM; 3366 } 3367 return 0; 3368 } 3369 3370 int proto_register(struct proto *prot, int alloc_slab) 3371 { 3372 int ret = -ENOBUFS; 3373 3374 if (alloc_slab) { 3375 prot->slab = kmem_cache_create_usercopy(prot->name, 3376 prot->obj_size, 0, 3377 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT | 3378 prot->slab_flags, 3379 prot->useroffset, prot->usersize, 3380 NULL); 3381 3382 if (prot->slab == NULL) { 3383 pr_crit("%s: Can't create sock SLAB cache!\n", 3384 prot->name); 3385 goto out; 3386 } 3387 3388 if (req_prot_init(prot)) 3389 goto out_free_request_sock_slab; 3390 3391 if (prot->twsk_prot != NULL) { 3392 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 3393 3394 if (prot->twsk_prot->twsk_slab_name == NULL) 3395 goto out_free_request_sock_slab; 3396 3397 prot->twsk_prot->twsk_slab = 3398 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 3399 prot->twsk_prot->twsk_obj_size, 3400 0, 3401 SLAB_ACCOUNT | 3402 prot->slab_flags, 3403 NULL); 3404 if (prot->twsk_prot->twsk_slab == NULL) 3405 goto out_free_timewait_sock_slab_name; 3406 } 3407 } 3408 3409 mutex_lock(&proto_list_mutex); 3410 ret = assign_proto_idx(prot); 3411 if (ret) { 3412 mutex_unlock(&proto_list_mutex); 3413 goto out_free_timewait_sock_slab_name; 3414 } 3415 list_add(&prot->node, &proto_list); 3416 mutex_unlock(&proto_list_mutex); 3417 return ret; 3418 3419 out_free_timewait_sock_slab_name: 3420 if (alloc_slab && prot->twsk_prot) 3421 kfree(prot->twsk_prot->twsk_slab_name); 3422 out_free_request_sock_slab: 3423 if (alloc_slab) { 3424 req_prot_cleanup(prot->rsk_prot); 3425 3426 kmem_cache_destroy(prot->slab); 3427 prot->slab = NULL; 3428 } 3429 out: 3430 return ret; 3431 } 3432 EXPORT_SYMBOL(proto_register); 3433 3434 void proto_unregister(struct proto *prot) 3435 { 3436 mutex_lock(&proto_list_mutex); 3437 release_proto_idx(prot); 3438 list_del(&prot->node); 3439 mutex_unlock(&proto_list_mutex); 3440 3441 kmem_cache_destroy(prot->slab); 3442 prot->slab = NULL; 3443 3444 req_prot_cleanup(prot->rsk_prot); 3445 3446 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 3447 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 3448 kfree(prot->twsk_prot->twsk_slab_name); 3449 prot->twsk_prot->twsk_slab = NULL; 3450 } 3451 } 3452 EXPORT_SYMBOL(proto_unregister); 3453 3454 int sock_load_diag_module(int family, int protocol) 3455 { 3456 if (!protocol) { 3457 if (!sock_is_registered(family)) 3458 return -ENOENT; 3459 3460 return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 3461 NETLINK_SOCK_DIAG, family); 3462 } 3463 3464 #ifdef CONFIG_INET 3465 if (family == AF_INET && 3466 protocol != IPPROTO_RAW && 3467 !rcu_access_pointer(inet_protos[protocol])) 3468 return -ENOENT; 3469 #endif 3470 3471 return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, 3472 NETLINK_SOCK_DIAG, family, protocol); 3473 } 3474 EXPORT_SYMBOL(sock_load_diag_module); 3475 3476 #ifdef CONFIG_PROC_FS 3477 static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 3478 __acquires(proto_list_mutex) 3479 { 3480 mutex_lock(&proto_list_mutex); 3481 return seq_list_start_head(&proto_list, *pos); 3482 } 3483 3484 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3485 { 3486 return seq_list_next(v, &proto_list, pos); 3487 } 3488 3489 static void proto_seq_stop(struct seq_file *seq, void *v) 3490 __releases(proto_list_mutex) 3491 { 3492 mutex_unlock(&proto_list_mutex); 3493 } 3494 3495 static char proto_method_implemented(const void *method) 3496 { 3497 return method == NULL ? 'n' : 'y'; 3498 } 3499 static long sock_prot_memory_allocated(struct proto *proto) 3500 { 3501 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; 3502 } 3503 3504 static const char *sock_prot_memory_pressure(struct proto *proto) 3505 { 3506 return proto->memory_pressure != NULL ? 3507 proto_memory_pressure(proto) ? "yes" : "no" : "NI"; 3508 } 3509 3510 static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 3511 { 3512 3513 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 3514 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 3515 proto->name, 3516 proto->obj_size, 3517 sock_prot_inuse_get(seq_file_net(seq), proto), 3518 sock_prot_memory_allocated(proto), 3519 sock_prot_memory_pressure(proto), 3520 proto->max_header, 3521 proto->slab == NULL ? "no" : "yes", 3522 module_name(proto->owner), 3523 proto_method_implemented(proto->close), 3524 proto_method_implemented(proto->connect), 3525 proto_method_implemented(proto->disconnect), 3526 proto_method_implemented(proto->accept), 3527 proto_method_implemented(proto->ioctl), 3528 proto_method_implemented(proto->init), 3529 proto_method_implemented(proto->destroy), 3530 proto_method_implemented(proto->shutdown), 3531 proto_method_implemented(proto->setsockopt), 3532 proto_method_implemented(proto->getsockopt), 3533 proto_method_implemented(proto->sendmsg), 3534 proto_method_implemented(proto->recvmsg), 3535 proto_method_implemented(proto->sendpage), 3536 proto_method_implemented(proto->bind), 3537 proto_method_implemented(proto->backlog_rcv), 3538 proto_method_implemented(proto->hash), 3539 proto_method_implemented(proto->unhash), 3540 proto_method_implemented(proto->get_port), 3541 proto_method_implemented(proto->enter_memory_pressure)); 3542 } 3543 3544 static int proto_seq_show(struct seq_file *seq, void *v) 3545 { 3546 if (v == &proto_list) 3547 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 3548 "protocol", 3549 "size", 3550 "sockets", 3551 "memory", 3552 "press", 3553 "maxhdr", 3554 "slab", 3555 "module", 3556 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 3557 else 3558 proto_seq_printf(seq, list_entry(v, struct proto, node)); 3559 return 0; 3560 } 3561 3562 static const struct seq_operations proto_seq_ops = { 3563 .start = proto_seq_start, 3564 .next = proto_seq_next, 3565 .stop = proto_seq_stop, 3566 .show = proto_seq_show, 3567 }; 3568 3569 static __net_init int proto_init_net(struct net *net) 3570 { 3571 if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops, 3572 sizeof(struct seq_net_private))) 3573 return -ENOMEM; 3574 3575 return 0; 3576 } 3577 3578 static __net_exit void proto_exit_net(struct net *net) 3579 { 3580 remove_proc_entry("protocols", net->proc_net); 3581 } 3582 3583 3584 static __net_initdata struct pernet_operations proto_net_ops = { 3585 .init = proto_init_net, 3586 .exit = proto_exit_net, 3587 }; 3588 3589 static int __init proto_init(void) 3590 { 3591 return register_pernet_subsys(&proto_net_ops); 3592 } 3593 3594 subsys_initcall(proto_init); 3595 3596 #endif /* PROC_FS */ 3597 3598 #ifdef CONFIG_NET_RX_BUSY_POLL 3599 bool sk_busy_loop_end(void *p, unsigned long start_time) 3600 { 3601 struct sock *sk = p; 3602 3603 return !skb_queue_empty_lockless(&sk->sk_receive_queue) || 3604 sk_busy_loop_timeout(sk, start_time); 3605 } 3606 EXPORT_SYMBOL(sk_busy_loop_end); 3607 #endif /* CONFIG_NET_RX_BUSY_POLL */ 3608