sock.c revision 8fb974c937570be38f944986456467b39a2dc252
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Generic socket support routines. Memory allocators, socket lock/release 7 * handler for protocols to use and generic option handler. 8 * 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 * This program is free software; you can redistribute it and/or 87 * modify it under the terms of the GNU General Public License 88 * as published by the Free Software Foundation; either version 89 * 2 of the License, or (at your option) any later version. 90 */ 91 92#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 93 94#include <linux/capability.h> 95#include <linux/errno.h> 96#include <linux/types.h> 97#include <linux/socket.h> 98#include <linux/in.h> 99#include <linux/kernel.h> 100#include <linux/module.h> 101#include <linux/proc_fs.h> 102#include <linux/seq_file.h> 103#include <linux/sched.h> 104#include <linux/timer.h> 105#include <linux/string.h> 106#include <linux/sockios.h> 107#include <linux/net.h> 108#include <linux/mm.h> 109#include <linux/slab.h> 110#include <linux/interrupt.h> 111#include <linux/poll.h> 112#include <linux/tcp.h> 113#include <linux/init.h> 114#include <linux/highmem.h> 115#include <linux/user_namespace.h> 116#include <linux/static_key.h> 117#include <linux/memcontrol.h> 118#include <linux/prefetch.h> 119 120#include <asm/uaccess.h> 121 122#include <linux/netdevice.h> 123#include <net/protocol.h> 124#include <linux/skbuff.h> 125#include <net/net_namespace.h> 126#include <net/request_sock.h> 127#include <net/sock.h> 128#include <linux/net_tstamp.h> 129#include <net/xfrm.h> 130#include <linux/ipsec.h> 131#include <net/cls_cgroup.h> 132#include <net/netprio_cgroup.h> 133 134#include <linux/filter.h> 135 136#include <trace/events/sock.h> 137 138#ifdef CONFIG_INET 139#include <net/tcp.h> 140#endif 141 142static DEFINE_MUTEX(proto_list_mutex); 143static LIST_HEAD(proto_list); 144 145#ifdef CONFIG_MEMCG_KMEM 146int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) 147{ 148 struct proto *proto; 149 int ret = 0; 150 151 mutex_lock(&proto_list_mutex); 152 list_for_each_entry(proto, &proto_list, node) { 153 if (proto->init_cgroup) { 154 ret = proto->init_cgroup(memcg, ss); 155 if (ret) 156 goto out; 157 } 158 } 159 160 mutex_unlock(&proto_list_mutex); 161 return ret; 162out: 163 list_for_each_entry_continue_reverse(proto, &proto_list, node) 164 if (proto->destroy_cgroup) 165 proto->destroy_cgroup(memcg); 166 mutex_unlock(&proto_list_mutex); 167 return ret; 168} 169 170void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) 171{ 172 struct proto *proto; 173 174 mutex_lock(&proto_list_mutex); 175 list_for_each_entry_reverse(proto, &proto_list, node) 176 if (proto->destroy_cgroup) 177 proto->destroy_cgroup(memcg); 178 mutex_unlock(&proto_list_mutex); 179} 180#endif 181 182/* 183 * Each address family might have different locking rules, so we have 184 * one slock key per address family: 185 */ 186static struct lock_class_key af_family_keys[AF_MAX]; 187static struct lock_class_key af_family_slock_keys[AF_MAX]; 188 189struct static_key memcg_socket_limit_enabled; 190EXPORT_SYMBOL(memcg_socket_limit_enabled); 191 192/* 193 * Make lock validator output more readable. (we pre-construct these 194 * strings build-time, so that runtime initialization of socket 195 * locks is fast): 196 */ 197static const char *const af_family_key_strings[AF_MAX+1] = { 198 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 199 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 200 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 201 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 202 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 203 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 204 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 205 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 206 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 207 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , 208 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 209 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , 210 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , 211 "sk_lock-AF_NFC" , "sk_lock-AF_MAX" 212}; 213static const char *const af_family_slock_key_strings[AF_MAX+1] = { 214 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 215 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 216 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 217 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 218 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 219 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 220 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 221 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , 222 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 223 "slock-27" , "slock-28" , "slock-AF_CAN" , 224 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 225 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 226 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , 227 "slock-AF_NFC" , "slock-AF_MAX" 228}; 229static const char *const af_family_clock_key_strings[AF_MAX+1] = { 230 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 231 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 232 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 233 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 234 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 235 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 236 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 237 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , 238 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 239 "clock-27" , "clock-28" , "clock-AF_CAN" , 240 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 241 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 242 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , 243 "clock-AF_NFC" , "clock-AF_MAX" 244}; 245 246/* 247 * sk_callback_lock locking rules are per-address-family, 248 * so split the lock classes by using a per-AF key: 249 */ 250static struct lock_class_key af_callback_keys[AF_MAX]; 251 252/* Take into consideration the size of the struct sk_buff overhead in the 253 * determination of these values, since that is non-constant across 254 * platforms. This makes socket queueing behavior and performance 255 * not depend upon such differences. 256 */ 257#define _SK_MEM_PACKETS 256 258#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) 259#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 260#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 261 262/* Run time adjustable parameters. */ 263__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 264EXPORT_SYMBOL(sysctl_wmem_max); 265__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 266EXPORT_SYMBOL(sysctl_rmem_max); 267__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 268__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 269 270/* Maximal space eaten by iovec or ancillary data plus some space */ 271int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 272EXPORT_SYMBOL(sysctl_optmem_max); 273 274struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; 275EXPORT_SYMBOL_GPL(memalloc_socks); 276 277/** 278 * sk_set_memalloc - sets %SOCK_MEMALLOC 279 * @sk: socket to set it on 280 * 281 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. 282 * It's the responsibility of the admin to adjust min_free_kbytes 283 * to meet the requirements 284 */ 285void sk_set_memalloc(struct sock *sk) 286{ 287 sock_set_flag(sk, SOCK_MEMALLOC); 288 sk->sk_allocation |= __GFP_MEMALLOC; 289 static_key_slow_inc(&memalloc_socks); 290} 291EXPORT_SYMBOL_GPL(sk_set_memalloc); 292 293void sk_clear_memalloc(struct sock *sk) 294{ 295 sock_reset_flag(sk, SOCK_MEMALLOC); 296 sk->sk_allocation &= ~__GFP_MEMALLOC; 297 static_key_slow_dec(&memalloc_socks); 298 299 /* 300 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward 301 * progress of swapping. However, if SOCK_MEMALLOC is cleared while 302 * it has rmem allocations there is a risk that the user of the 303 * socket cannot make forward progress due to exceeding the rmem 304 * limits. By rights, sk_clear_memalloc() should only be called 305 * on sockets being torn down but warn and reset the accounting if 306 * that assumption breaks. 307 */ 308 if (WARN_ON(sk->sk_forward_alloc)) 309 sk_mem_reclaim(sk); 310} 311EXPORT_SYMBOL_GPL(sk_clear_memalloc); 312 313int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 314{ 315 int ret; 316 unsigned long pflags = current->flags; 317 318 /* these should have been dropped before queueing */ 319 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); 320 321 current->flags |= PF_MEMALLOC; 322 ret = sk->sk_backlog_rcv(sk, skb); 323 tsk_restore_flags(current, pflags, PF_MEMALLOC); 324 325 return ret; 326} 327EXPORT_SYMBOL(__sk_backlog_rcv); 328 329#if defined(CONFIG_CGROUPS) 330#if !defined(CONFIG_NET_CLS_CGROUP) 331int net_cls_subsys_id = -1; 332EXPORT_SYMBOL_GPL(net_cls_subsys_id); 333#endif 334#if !defined(CONFIG_NETPRIO_CGROUP) 335int net_prio_subsys_id = -1; 336EXPORT_SYMBOL_GPL(net_prio_subsys_id); 337#endif 338#endif 339 340static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 341{ 342 struct timeval tv; 343 344 if (optlen < sizeof(tv)) 345 return -EINVAL; 346 if (copy_from_user(&tv, optval, sizeof(tv))) 347 return -EFAULT; 348 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 349 return -EDOM; 350 351 if (tv.tv_sec < 0) { 352 static int warned __read_mostly; 353 354 *timeo_p = 0; 355 if (warned < 10 && net_ratelimit()) { 356 warned++; 357 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", 358 __func__, current->comm, task_pid_nr(current)); 359 } 360 return 0; 361 } 362 *timeo_p = MAX_SCHEDULE_TIMEOUT; 363 if (tv.tv_sec == 0 && tv.tv_usec == 0) 364 return 0; 365 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 366 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 367 return 0; 368} 369 370static void sock_warn_obsolete_bsdism(const char *name) 371{ 372 static int warned; 373 static char warncomm[TASK_COMM_LEN]; 374 if (strcmp(warncomm, current->comm) && warned < 5) { 375 strcpy(warncomm, current->comm); 376 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", 377 warncomm, name); 378 warned++; 379 } 380} 381 382#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) 383 384static void sock_disable_timestamp(struct sock *sk, unsigned long flags) 385{ 386 if (sk->sk_flags & flags) { 387 sk->sk_flags &= ~flags; 388 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) 389 net_disable_timestamp(); 390 } 391} 392 393 394int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 395{ 396 int err; 397 int skb_len; 398 unsigned long flags; 399 struct sk_buff_head *list = &sk->sk_receive_queue; 400 401 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { 402 atomic_inc(&sk->sk_drops); 403 trace_sock_rcvqueue_full(sk, skb); 404 return -ENOMEM; 405 } 406 407 err = sk_filter(sk, skb); 408 if (err) 409 return err; 410 411 if (!sk_rmem_schedule(sk, skb, skb->truesize)) { 412 atomic_inc(&sk->sk_drops); 413 return -ENOBUFS; 414 } 415 416 skb->dev = NULL; 417 skb_set_owner_r(skb, sk); 418 419 /* Cache the SKB length before we tack it onto the receive 420 * queue. Once it is added it no longer belongs to us and 421 * may be freed by other threads of control pulling packets 422 * from the queue. 423 */ 424 skb_len = skb->len; 425 426 /* we escape from rcu protected region, make sure we dont leak 427 * a norefcounted dst 428 */ 429 skb_dst_force(skb); 430 431 spin_lock_irqsave(&list->lock, flags); 432 skb->dropcount = atomic_read(&sk->sk_drops); 433 __skb_queue_tail(list, skb); 434 spin_unlock_irqrestore(&list->lock, flags); 435 436 if (!sock_flag(sk, SOCK_DEAD)) 437 sk->sk_data_ready(sk, skb_len); 438 return 0; 439} 440EXPORT_SYMBOL(sock_queue_rcv_skb); 441 442int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 443{ 444 int rc = NET_RX_SUCCESS; 445 446 if (sk_filter(sk, skb)) 447 goto discard_and_relse; 448 449 skb->dev = NULL; 450 451 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { 452 atomic_inc(&sk->sk_drops); 453 goto discard_and_relse; 454 } 455 if (nested) 456 bh_lock_sock_nested(sk); 457 else 458 bh_lock_sock(sk); 459 if (!sock_owned_by_user(sk)) { 460 /* 461 * trylock + unlock semantics: 462 */ 463 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 464 465 rc = sk_backlog_rcv(sk, skb); 466 467 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 468 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 469 bh_unlock_sock(sk); 470 atomic_inc(&sk->sk_drops); 471 goto discard_and_relse; 472 } 473 474 bh_unlock_sock(sk); 475out: 476 sock_put(sk); 477 return rc; 478discard_and_relse: 479 kfree_skb(skb); 480 goto out; 481} 482EXPORT_SYMBOL(sk_receive_skb); 483 484void sk_reset_txq(struct sock *sk) 485{ 486 sk_tx_queue_clear(sk); 487} 488EXPORT_SYMBOL(sk_reset_txq); 489 490struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 491{ 492 struct dst_entry *dst = __sk_dst_get(sk); 493 494 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 495 sk_tx_queue_clear(sk); 496 RCU_INIT_POINTER(sk->sk_dst_cache, NULL); 497 dst_release(dst); 498 return NULL; 499 } 500 501 return dst; 502} 503EXPORT_SYMBOL(__sk_dst_check); 504 505struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 506{ 507 struct dst_entry *dst = sk_dst_get(sk); 508 509 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 510 sk_dst_reset(sk); 511 dst_release(dst); 512 return NULL; 513 } 514 515 return dst; 516} 517EXPORT_SYMBOL(sk_dst_check); 518 519static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 520{ 521 int ret = -ENOPROTOOPT; 522#ifdef CONFIG_NETDEVICES 523 struct net *net = sock_net(sk); 524 char devname[IFNAMSIZ]; 525 int index; 526 527 /* Sorry... */ 528 ret = -EPERM; 529 if (!capable(CAP_NET_RAW)) 530 goto out; 531 532 ret = -EINVAL; 533 if (optlen < 0) 534 goto out; 535 536 /* Bind this socket to a particular device like "eth0", 537 * as specified in the passed interface name. If the 538 * name is "" or the option length is zero the socket 539 * is not bound. 540 */ 541 if (optlen > IFNAMSIZ - 1) 542 optlen = IFNAMSIZ - 1; 543 memset(devname, 0, sizeof(devname)); 544 545 ret = -EFAULT; 546 if (copy_from_user(devname, optval, optlen)) 547 goto out; 548 549 index = 0; 550 if (devname[0] != '\0') { 551 struct net_device *dev; 552 553 rcu_read_lock(); 554 dev = dev_get_by_name_rcu(net, devname); 555 if (dev) 556 index = dev->ifindex; 557 rcu_read_unlock(); 558 ret = -ENODEV; 559 if (!dev) 560 goto out; 561 } 562 563 lock_sock(sk); 564 sk->sk_bound_dev_if = index; 565 sk_dst_reset(sk); 566 release_sock(sk); 567 568 ret = 0; 569 570out: 571#endif 572 573 return ret; 574} 575 576static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 577{ 578 if (valbool) 579 sock_set_flag(sk, bit); 580 else 581 sock_reset_flag(sk, bit); 582} 583 584/* 585 * This is meant for all protocols to use and covers goings on 586 * at the socket level. Everything here is generic. 587 */ 588 589int sock_setsockopt(struct socket *sock, int level, int optname, 590 char __user *optval, unsigned int optlen) 591{ 592 struct sock *sk = sock->sk; 593 int val; 594 int valbool; 595 struct linger ling; 596 int ret = 0; 597 598 /* 599 * Options without arguments 600 */ 601 602 if (optname == SO_BINDTODEVICE) 603 return sock_bindtodevice(sk, optval, optlen); 604 605 if (optlen < sizeof(int)) 606 return -EINVAL; 607 608 if (get_user(val, (int __user *)optval)) 609 return -EFAULT; 610 611 valbool = val ? 1 : 0; 612 613 lock_sock(sk); 614 615 switch (optname) { 616 case SO_DEBUG: 617 if (val && !capable(CAP_NET_ADMIN)) 618 ret = -EACCES; 619 else 620 sock_valbool_flag(sk, SOCK_DBG, valbool); 621 break; 622 case SO_REUSEADDR: 623 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); 624 break; 625 case SO_TYPE: 626 case SO_PROTOCOL: 627 case SO_DOMAIN: 628 case SO_ERROR: 629 ret = -ENOPROTOOPT; 630 break; 631 case SO_DONTROUTE: 632 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 633 break; 634 case SO_BROADCAST: 635 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 636 break; 637 case SO_SNDBUF: 638 /* Don't error on this BSD doesn't and if you think 639 * about it this is right. Otherwise apps have to 640 * play 'guess the biggest size' games. RCVBUF/SNDBUF 641 * are treated in BSD as hints 642 */ 643 val = min_t(u32, val, sysctl_wmem_max); 644set_sndbuf: 645 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 646 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); 647 /* Wake up sending tasks if we upped the value. */ 648 sk->sk_write_space(sk); 649 break; 650 651 case SO_SNDBUFFORCE: 652 if (!capable(CAP_NET_ADMIN)) { 653 ret = -EPERM; 654 break; 655 } 656 goto set_sndbuf; 657 658 case SO_RCVBUF: 659 /* Don't error on this BSD doesn't and if you think 660 * about it this is right. Otherwise apps have to 661 * play 'guess the biggest size' games. RCVBUF/SNDBUF 662 * are treated in BSD as hints 663 */ 664 val = min_t(u32, val, sysctl_rmem_max); 665set_rcvbuf: 666 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 667 /* 668 * We double it on the way in to account for 669 * "struct sk_buff" etc. overhead. Applications 670 * assume that the SO_RCVBUF setting they make will 671 * allow that much actual data to be received on that 672 * socket. 673 * 674 * Applications are unaware that "struct sk_buff" and 675 * other overheads allocate from the receive buffer 676 * during socket buffer allocation. 677 * 678 * And after considering the possible alternatives, 679 * returning the value we actually used in getsockopt 680 * is the most desirable behavior. 681 */ 682 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); 683 break; 684 685 case SO_RCVBUFFORCE: 686 if (!capable(CAP_NET_ADMIN)) { 687 ret = -EPERM; 688 break; 689 } 690 goto set_rcvbuf; 691 692 case SO_KEEPALIVE: 693#ifdef CONFIG_INET 694 if (sk->sk_protocol == IPPROTO_TCP) 695 tcp_set_keepalive(sk, valbool); 696#endif 697 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 698 break; 699 700 case SO_OOBINLINE: 701 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 702 break; 703 704 case SO_NO_CHECK: 705 sk->sk_no_check = valbool; 706 break; 707 708 case SO_PRIORITY: 709 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 710 sk->sk_priority = val; 711 else 712 ret = -EPERM; 713 break; 714 715 case SO_LINGER: 716 if (optlen < sizeof(ling)) { 717 ret = -EINVAL; /* 1003.1g */ 718 break; 719 } 720 if (copy_from_user(&ling, optval, sizeof(ling))) { 721 ret = -EFAULT; 722 break; 723 } 724 if (!ling.l_onoff) 725 sock_reset_flag(sk, SOCK_LINGER); 726 else { 727#if (BITS_PER_LONG == 32) 728 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 729 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 730 else 731#endif 732 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 733 sock_set_flag(sk, SOCK_LINGER); 734 } 735 break; 736 737 case SO_BSDCOMPAT: 738 sock_warn_obsolete_bsdism("setsockopt"); 739 break; 740 741 case SO_PASSCRED: 742 if (valbool) 743 set_bit(SOCK_PASSCRED, &sock->flags); 744 else 745 clear_bit(SOCK_PASSCRED, &sock->flags); 746 break; 747 748 case SO_TIMESTAMP: 749 case SO_TIMESTAMPNS: 750 if (valbool) { 751 if (optname == SO_TIMESTAMP) 752 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 753 else 754 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 755 sock_set_flag(sk, SOCK_RCVTSTAMP); 756 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 757 } else { 758 sock_reset_flag(sk, SOCK_RCVTSTAMP); 759 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 760 } 761 break; 762 763 case SO_TIMESTAMPING: 764 if (val & ~SOF_TIMESTAMPING_MASK) { 765 ret = -EINVAL; 766 break; 767 } 768 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, 769 val & SOF_TIMESTAMPING_TX_HARDWARE); 770 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, 771 val & SOF_TIMESTAMPING_TX_SOFTWARE); 772 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, 773 val & SOF_TIMESTAMPING_RX_HARDWARE); 774 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 775 sock_enable_timestamp(sk, 776 SOCK_TIMESTAMPING_RX_SOFTWARE); 777 else 778 sock_disable_timestamp(sk, 779 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); 780 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, 781 val & SOF_TIMESTAMPING_SOFTWARE); 782 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, 783 val & SOF_TIMESTAMPING_SYS_HARDWARE); 784 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, 785 val & SOF_TIMESTAMPING_RAW_HARDWARE); 786 break; 787 788 case SO_RCVLOWAT: 789 if (val < 0) 790 val = INT_MAX; 791 sk->sk_rcvlowat = val ? : 1; 792 break; 793 794 case SO_RCVTIMEO: 795 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 796 break; 797 798 case SO_SNDTIMEO: 799 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 800 break; 801 802 case SO_ATTACH_FILTER: 803 ret = -EINVAL; 804 if (optlen == sizeof(struct sock_fprog)) { 805 struct sock_fprog fprog; 806 807 ret = -EFAULT; 808 if (copy_from_user(&fprog, optval, sizeof(fprog))) 809 break; 810 811 ret = sk_attach_filter(&fprog, sk); 812 } 813 break; 814 815 case SO_DETACH_FILTER: 816 ret = sk_detach_filter(sk); 817 break; 818 819 case SO_PASSSEC: 820 if (valbool) 821 set_bit(SOCK_PASSSEC, &sock->flags); 822 else 823 clear_bit(SOCK_PASSSEC, &sock->flags); 824 break; 825 case SO_MARK: 826 if (!capable(CAP_NET_ADMIN)) 827 ret = -EPERM; 828 else 829 sk->sk_mark = val; 830 break; 831 832 /* We implement the SO_SNDLOWAT etc to 833 not be settable (1003.1g 5.3) */ 834 case SO_RXQ_OVFL: 835 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); 836 break; 837 838 case SO_WIFI_STATUS: 839 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); 840 break; 841 842 case SO_PEEK_OFF: 843 if (sock->ops->set_peek_off) 844 sock->ops->set_peek_off(sk, val); 845 else 846 ret = -EOPNOTSUPP; 847 break; 848 849 case SO_NOFCS: 850 sock_valbool_flag(sk, SOCK_NOFCS, valbool); 851 break; 852 853 default: 854 ret = -ENOPROTOOPT; 855 break; 856 } 857 release_sock(sk); 858 return ret; 859} 860EXPORT_SYMBOL(sock_setsockopt); 861 862 863void cred_to_ucred(struct pid *pid, const struct cred *cred, 864 struct ucred *ucred) 865{ 866 ucred->pid = pid_vnr(pid); 867 ucred->uid = ucred->gid = -1; 868 if (cred) { 869 struct user_namespace *current_ns = current_user_ns(); 870 871 ucred->uid = from_kuid(current_ns, cred->euid); 872 ucred->gid = from_kgid(current_ns, cred->egid); 873 } 874} 875EXPORT_SYMBOL_GPL(cred_to_ucred); 876 877int sock_getsockopt(struct socket *sock, int level, int optname, 878 char __user *optval, int __user *optlen) 879{ 880 struct sock *sk = sock->sk; 881 882 union { 883 int val; 884 struct linger ling; 885 struct timeval tm; 886 } v; 887 888 int lv = sizeof(int); 889 int len; 890 891 if (get_user(len, optlen)) 892 return -EFAULT; 893 if (len < 0) 894 return -EINVAL; 895 896 memset(&v, 0, sizeof(v)); 897 898 switch (optname) { 899 case SO_DEBUG: 900 v.val = sock_flag(sk, SOCK_DBG); 901 break; 902 903 case SO_DONTROUTE: 904 v.val = sock_flag(sk, SOCK_LOCALROUTE); 905 break; 906 907 case SO_BROADCAST: 908 v.val = sock_flag(sk, SOCK_BROADCAST); 909 break; 910 911 case SO_SNDBUF: 912 v.val = sk->sk_sndbuf; 913 break; 914 915 case SO_RCVBUF: 916 v.val = sk->sk_rcvbuf; 917 break; 918 919 case SO_REUSEADDR: 920 v.val = sk->sk_reuse; 921 break; 922 923 case SO_KEEPALIVE: 924 v.val = sock_flag(sk, SOCK_KEEPOPEN); 925 break; 926 927 case SO_TYPE: 928 v.val = sk->sk_type; 929 break; 930 931 case SO_PROTOCOL: 932 v.val = sk->sk_protocol; 933 break; 934 935 case SO_DOMAIN: 936 v.val = sk->sk_family; 937 break; 938 939 case SO_ERROR: 940 v.val = -sock_error(sk); 941 if (v.val == 0) 942 v.val = xchg(&sk->sk_err_soft, 0); 943 break; 944 945 case SO_OOBINLINE: 946 v.val = sock_flag(sk, SOCK_URGINLINE); 947 break; 948 949 case SO_NO_CHECK: 950 v.val = sk->sk_no_check; 951 break; 952 953 case SO_PRIORITY: 954 v.val = sk->sk_priority; 955 break; 956 957 case SO_LINGER: 958 lv = sizeof(v.ling); 959 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); 960 v.ling.l_linger = sk->sk_lingertime / HZ; 961 break; 962 963 case SO_BSDCOMPAT: 964 sock_warn_obsolete_bsdism("getsockopt"); 965 break; 966 967 case SO_TIMESTAMP: 968 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 969 !sock_flag(sk, SOCK_RCVTSTAMPNS); 970 break; 971 972 case SO_TIMESTAMPNS: 973 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 974 break; 975 976 case SO_TIMESTAMPING: 977 v.val = 0; 978 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 979 v.val |= SOF_TIMESTAMPING_TX_HARDWARE; 980 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 981 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; 982 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) 983 v.val |= SOF_TIMESTAMPING_RX_HARDWARE; 984 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 985 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; 986 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) 987 v.val |= SOF_TIMESTAMPING_SOFTWARE; 988 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) 989 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; 990 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) 991 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; 992 break; 993 994 case SO_RCVTIMEO: 995 lv = sizeof(struct timeval); 996 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 997 v.tm.tv_sec = 0; 998 v.tm.tv_usec = 0; 999 } else { 1000 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 1001 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 1002 } 1003 break; 1004 1005 case SO_SNDTIMEO: 1006 lv = sizeof(struct timeval); 1007 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 1008 v.tm.tv_sec = 0; 1009 v.tm.tv_usec = 0; 1010 } else { 1011 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 1012 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 1013 } 1014 break; 1015 1016 case SO_RCVLOWAT: 1017 v.val = sk->sk_rcvlowat; 1018 break; 1019 1020 case SO_SNDLOWAT: 1021 v.val = 1; 1022 break; 1023 1024 case SO_PASSCRED: 1025 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); 1026 break; 1027 1028 case SO_PEERCRED: 1029 { 1030 struct ucred peercred; 1031 if (len > sizeof(peercred)) 1032 len = sizeof(peercred); 1033 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); 1034 if (copy_to_user(optval, &peercred, len)) 1035 return -EFAULT; 1036 goto lenout; 1037 } 1038 1039 case SO_PEERNAME: 1040 { 1041 char address[128]; 1042 1043 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 1044 return -ENOTCONN; 1045 if (lv < len) 1046 return -EINVAL; 1047 if (copy_to_user(optval, address, len)) 1048 return -EFAULT; 1049 goto lenout; 1050 } 1051 1052 /* Dubious BSD thing... Probably nobody even uses it, but 1053 * the UNIX standard wants it for whatever reason... -DaveM 1054 */ 1055 case SO_ACCEPTCONN: 1056 v.val = sk->sk_state == TCP_LISTEN; 1057 break; 1058 1059 case SO_PASSSEC: 1060 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); 1061 break; 1062 1063 case SO_PEERSEC: 1064 return security_socket_getpeersec_stream(sock, optval, optlen, len); 1065 1066 case SO_MARK: 1067 v.val = sk->sk_mark; 1068 break; 1069 1070 case SO_RXQ_OVFL: 1071 v.val = sock_flag(sk, SOCK_RXQ_OVFL); 1072 break; 1073 1074 case SO_WIFI_STATUS: 1075 v.val = sock_flag(sk, SOCK_WIFI_STATUS); 1076 break; 1077 1078 case SO_PEEK_OFF: 1079 if (!sock->ops->set_peek_off) 1080 return -EOPNOTSUPP; 1081 1082 v.val = sk->sk_peek_off; 1083 break; 1084 case SO_NOFCS: 1085 v.val = sock_flag(sk, SOCK_NOFCS); 1086 break; 1087 default: 1088 return -ENOPROTOOPT; 1089 } 1090 1091 if (len > lv) 1092 len = lv; 1093 if (copy_to_user(optval, &v, len)) 1094 return -EFAULT; 1095lenout: 1096 if (put_user(len, optlen)) 1097 return -EFAULT; 1098 return 0; 1099} 1100 1101/* 1102 * Initialize an sk_lock. 1103 * 1104 * (We also register the sk_lock with the lock validator.) 1105 */ 1106static inline void sock_lock_init(struct sock *sk) 1107{ 1108 sock_lock_init_class_and_name(sk, 1109 af_family_slock_key_strings[sk->sk_family], 1110 af_family_slock_keys + sk->sk_family, 1111 af_family_key_strings[sk->sk_family], 1112 af_family_keys + sk->sk_family); 1113} 1114 1115/* 1116 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 1117 * even temporarly, because of RCU lookups. sk_node should also be left as is. 1118 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end 1119 */ 1120static void sock_copy(struct sock *nsk, const struct sock *osk) 1121{ 1122#ifdef CONFIG_SECURITY_NETWORK 1123 void *sptr = nsk->sk_security; 1124#endif 1125 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); 1126 1127 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, 1128 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); 1129 1130#ifdef CONFIG_SECURITY_NETWORK 1131 nsk->sk_security = sptr; 1132 security_sk_clone(osk, nsk); 1133#endif 1134} 1135 1136/* 1137 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes 1138 * un-modified. Special care is taken when initializing object to zero. 1139 */ 1140static inline void sk_prot_clear_nulls(struct sock *sk, int size) 1141{ 1142 if (offsetof(struct sock, sk_node.next) != 0) 1143 memset(sk, 0, offsetof(struct sock, sk_node.next)); 1144 memset(&sk->sk_node.pprev, 0, 1145 size - offsetof(struct sock, sk_node.pprev)); 1146} 1147 1148void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) 1149{ 1150 unsigned long nulls1, nulls2; 1151 1152 nulls1 = offsetof(struct sock, __sk_common.skc_node.next); 1153 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); 1154 if (nulls1 > nulls2) 1155 swap(nulls1, nulls2); 1156 1157 if (nulls1 != 0) 1158 memset((char *)sk, 0, nulls1); 1159 memset((char *)sk + nulls1 + sizeof(void *), 0, 1160 nulls2 - nulls1 - sizeof(void *)); 1161 memset((char *)sk + nulls2 + sizeof(void *), 0, 1162 size - nulls2 - sizeof(void *)); 1163} 1164EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); 1165 1166static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1167 int family) 1168{ 1169 struct sock *sk; 1170 struct kmem_cache *slab; 1171 1172 slab = prot->slab; 1173 if (slab != NULL) { 1174 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1175 if (!sk) 1176 return sk; 1177 if (priority & __GFP_ZERO) { 1178 if (prot->clear_sk) 1179 prot->clear_sk(sk, prot->obj_size); 1180 else 1181 sk_prot_clear_nulls(sk, prot->obj_size); 1182 } 1183 } else 1184 sk = kmalloc(prot->obj_size, priority); 1185 1186 if (sk != NULL) { 1187 kmemcheck_annotate_bitfield(sk, flags); 1188 1189 if (security_sk_alloc(sk, family, priority)) 1190 goto out_free; 1191 1192 if (!try_module_get(prot->owner)) 1193 goto out_free_sec; 1194 sk_tx_queue_clear(sk); 1195 } 1196 1197 return sk; 1198 1199out_free_sec: 1200 security_sk_free(sk); 1201out_free: 1202 if (slab != NULL) 1203 kmem_cache_free(slab, sk); 1204 else 1205 kfree(sk); 1206 return NULL; 1207} 1208 1209static void sk_prot_free(struct proto *prot, struct sock *sk) 1210{ 1211 struct kmem_cache *slab; 1212 struct module *owner; 1213 1214 owner = prot->owner; 1215 slab = prot->slab; 1216 1217 security_sk_free(sk); 1218 if (slab != NULL) 1219 kmem_cache_free(slab, sk); 1220 else 1221 kfree(sk); 1222 module_put(owner); 1223} 1224 1225#ifdef CONFIG_CGROUPS 1226#if IS_ENABLED(CONFIG_NET_CLS_CGROUP) 1227void sock_update_classid(struct sock *sk) 1228{ 1229 u32 classid; 1230 1231 rcu_read_lock(); /* doing current task, which cannot vanish. */ 1232 classid = task_cls_classid(current); 1233 rcu_read_unlock(); 1234 if (classid && classid != sk->sk_classid) 1235 sk->sk_classid = classid; 1236} 1237EXPORT_SYMBOL(sock_update_classid); 1238#endif 1239 1240void sock_update_netprioidx(struct sock *sk, struct task_struct *task) 1241{ 1242 if (in_interrupt()) 1243 return; 1244 1245 sk->sk_cgrp_prioidx = task_netprioidx(task); 1246} 1247EXPORT_SYMBOL_GPL(sock_update_netprioidx); 1248#endif 1249 1250/** 1251 * sk_alloc - All socket objects are allocated here 1252 * @net: the applicable net namespace 1253 * @family: protocol family 1254 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1255 * @prot: struct proto associated with this new sock instance 1256 */ 1257struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1258 struct proto *prot) 1259{ 1260 struct sock *sk; 1261 1262 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1263 if (sk) { 1264 sk->sk_family = family; 1265 /* 1266 * See comment in struct sock definition to understand 1267 * why we need sk_prot_creator -acme 1268 */ 1269 sk->sk_prot = sk->sk_prot_creator = prot; 1270 sock_lock_init(sk); 1271 sock_net_set(sk, get_net(net)); 1272 atomic_set(&sk->sk_wmem_alloc, 1); 1273 1274 sock_update_classid(sk); 1275 sock_update_netprioidx(sk, current); 1276 } 1277 1278 return sk; 1279} 1280EXPORT_SYMBOL(sk_alloc); 1281 1282static void __sk_free(struct sock *sk) 1283{ 1284 struct sk_filter *filter; 1285 1286 if (sk->sk_destruct) 1287 sk->sk_destruct(sk); 1288 1289 filter = rcu_dereference_check(sk->sk_filter, 1290 atomic_read(&sk->sk_wmem_alloc) == 0); 1291 if (filter) { 1292 sk_filter_uncharge(sk, filter); 1293 RCU_INIT_POINTER(sk->sk_filter, NULL); 1294 } 1295 1296 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); 1297 1298 if (atomic_read(&sk->sk_omem_alloc)) 1299 pr_debug("%s: optmem leakage (%d bytes) detected\n", 1300 __func__, atomic_read(&sk->sk_omem_alloc)); 1301 1302 if (sk->sk_peer_cred) 1303 put_cred(sk->sk_peer_cred); 1304 put_pid(sk->sk_peer_pid); 1305 put_net(sock_net(sk)); 1306 sk_prot_free(sk->sk_prot_creator, sk); 1307} 1308 1309void sk_free(struct sock *sk) 1310{ 1311 /* 1312 * We subtract one from sk_wmem_alloc and can know if 1313 * some packets are still in some tx queue. 1314 * If not null, sock_wfree() will call __sk_free(sk) later 1315 */ 1316 if (atomic_dec_and_test(&sk->sk_wmem_alloc)) 1317 __sk_free(sk); 1318} 1319EXPORT_SYMBOL(sk_free); 1320 1321/* 1322 * Last sock_put should drop reference to sk->sk_net. It has already 1323 * been dropped in sk_change_net. Taking reference to stopping namespace 1324 * is not an option. 1325 * Take reference to a socket to remove it from hash _alive_ and after that 1326 * destroy it in the context of init_net. 1327 */ 1328void sk_release_kernel(struct sock *sk) 1329{ 1330 if (sk == NULL || sk->sk_socket == NULL) 1331 return; 1332 1333 sock_hold(sk); 1334 sock_release(sk->sk_socket); 1335 release_net(sock_net(sk)); 1336 sock_net_set(sk, get_net(&init_net)); 1337 sock_put(sk); 1338} 1339EXPORT_SYMBOL(sk_release_kernel); 1340 1341static void sk_update_clone(const struct sock *sk, struct sock *newsk) 1342{ 1343 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) 1344 sock_update_memcg(newsk); 1345} 1346 1347/** 1348 * sk_clone_lock - clone a socket, and lock its clone 1349 * @sk: the socket to clone 1350 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1351 * 1352 * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) 1353 */ 1354struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) 1355{ 1356 struct sock *newsk; 1357 1358 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1359 if (newsk != NULL) { 1360 struct sk_filter *filter; 1361 1362 sock_copy(newsk, sk); 1363 1364 /* SANITY */ 1365 get_net(sock_net(newsk)); 1366 sk_node_init(&newsk->sk_node); 1367 sock_lock_init(newsk); 1368 bh_lock_sock(newsk); 1369 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1370 newsk->sk_backlog.len = 0; 1371 1372 atomic_set(&newsk->sk_rmem_alloc, 0); 1373 /* 1374 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1375 */ 1376 atomic_set(&newsk->sk_wmem_alloc, 1); 1377 atomic_set(&newsk->sk_omem_alloc, 0); 1378 skb_queue_head_init(&newsk->sk_receive_queue); 1379 skb_queue_head_init(&newsk->sk_write_queue); 1380#ifdef CONFIG_NET_DMA 1381 skb_queue_head_init(&newsk->sk_async_wait_queue); 1382#endif 1383 1384 spin_lock_init(&newsk->sk_dst_lock); 1385 rwlock_init(&newsk->sk_callback_lock); 1386 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1387 af_callback_keys + newsk->sk_family, 1388 af_family_clock_key_strings[newsk->sk_family]); 1389 1390 newsk->sk_dst_cache = NULL; 1391 newsk->sk_wmem_queued = 0; 1392 newsk->sk_forward_alloc = 0; 1393 newsk->sk_send_head = NULL; 1394 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1395 1396 sock_reset_flag(newsk, SOCK_DONE); 1397 skb_queue_head_init(&newsk->sk_error_queue); 1398 1399 filter = rcu_dereference_protected(newsk->sk_filter, 1); 1400 if (filter != NULL) 1401 sk_filter_charge(newsk, filter); 1402 1403 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1404 /* It is still raw copy of parent, so invalidate 1405 * destructor and make plain sk_free() */ 1406 newsk->sk_destruct = NULL; 1407 bh_unlock_sock(newsk); 1408 sk_free(newsk); 1409 newsk = NULL; 1410 goto out; 1411 } 1412 1413 newsk->sk_err = 0; 1414 newsk->sk_priority = 0; 1415 /* 1416 * Before updating sk_refcnt, we must commit prior changes to memory 1417 * (Documentation/RCU/rculist_nulls.txt for details) 1418 */ 1419 smp_wmb(); 1420 atomic_set(&newsk->sk_refcnt, 2); 1421 1422 /* 1423 * Increment the counter in the same struct proto as the master 1424 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1425 * is the same as sk->sk_prot->socks, as this field was copied 1426 * with memcpy). 1427 * 1428 * This _changes_ the previous behaviour, where 1429 * tcp_create_openreq_child always was incrementing the 1430 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1431 * to be taken into account in all callers. -acme 1432 */ 1433 sk_refcnt_debug_inc(newsk); 1434 sk_set_socket(newsk, NULL); 1435 newsk->sk_wq = NULL; 1436 1437 sk_update_clone(sk, newsk); 1438 1439 if (newsk->sk_prot->sockets_allocated) 1440 sk_sockets_allocated_inc(newsk); 1441 1442 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) 1443 net_enable_timestamp(); 1444 } 1445out: 1446 return newsk; 1447} 1448EXPORT_SYMBOL_GPL(sk_clone_lock); 1449 1450void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1451{ 1452 __sk_dst_set(sk, dst); 1453 sk->sk_route_caps = dst->dev->features; 1454 if (sk->sk_route_caps & NETIF_F_GSO) 1455 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1456 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1457 if (sk_can_gso(sk)) { 1458 if (dst->header_len) { 1459 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1460 } else { 1461 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1462 sk->sk_gso_max_size = dst->dev->gso_max_size; 1463 sk->sk_gso_max_segs = dst->dev->gso_max_segs; 1464 } 1465 } 1466} 1467EXPORT_SYMBOL_GPL(sk_setup_caps); 1468 1469void __init sk_init(void) 1470{ 1471 if (totalram_pages <= 4096) { 1472 sysctl_wmem_max = 32767; 1473 sysctl_rmem_max = 32767; 1474 sysctl_wmem_default = 32767; 1475 sysctl_rmem_default = 32767; 1476 } else if (totalram_pages >= 131072) { 1477 sysctl_wmem_max = 131071; 1478 sysctl_rmem_max = 131071; 1479 } 1480} 1481 1482/* 1483 * Simple resource managers for sockets. 1484 */ 1485 1486 1487/* 1488 * Write buffer destructor automatically called from kfree_skb. 1489 */ 1490void sock_wfree(struct sk_buff *skb) 1491{ 1492 struct sock *sk = skb->sk; 1493 unsigned int len = skb->truesize; 1494 1495 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1496 /* 1497 * Keep a reference on sk_wmem_alloc, this will be released 1498 * after sk_write_space() call 1499 */ 1500 atomic_sub(len - 1, &sk->sk_wmem_alloc); 1501 sk->sk_write_space(sk); 1502 len = 1; 1503 } 1504 /* 1505 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1506 * could not do because of in-flight packets 1507 */ 1508 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) 1509 __sk_free(sk); 1510} 1511EXPORT_SYMBOL(sock_wfree); 1512 1513/* 1514 * Read buffer destructor automatically called from kfree_skb. 1515 */ 1516void sock_rfree(struct sk_buff *skb) 1517{ 1518 struct sock *sk = skb->sk; 1519 unsigned int len = skb->truesize; 1520 1521 atomic_sub(len, &sk->sk_rmem_alloc); 1522 sk_mem_uncharge(sk, len); 1523} 1524EXPORT_SYMBOL(sock_rfree); 1525 1526void sock_edemux(struct sk_buff *skb) 1527{ 1528 sock_put(skb->sk); 1529} 1530EXPORT_SYMBOL(sock_edemux); 1531 1532int sock_i_uid(struct sock *sk) 1533{ 1534 int uid; 1535 1536 read_lock_bh(&sk->sk_callback_lock); 1537 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1538 read_unlock_bh(&sk->sk_callback_lock); 1539 return uid; 1540} 1541EXPORT_SYMBOL(sock_i_uid); 1542 1543unsigned long sock_i_ino(struct sock *sk) 1544{ 1545 unsigned long ino; 1546 1547 read_lock_bh(&sk->sk_callback_lock); 1548 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1549 read_unlock_bh(&sk->sk_callback_lock); 1550 return ino; 1551} 1552EXPORT_SYMBOL(sock_i_ino); 1553 1554/* 1555 * Allocate a skb from the socket's send buffer. 1556 */ 1557struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1558 gfp_t priority) 1559{ 1560 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1561 struct sk_buff *skb = alloc_skb(size, priority); 1562 if (skb) { 1563 skb_set_owner_w(skb, sk); 1564 return skb; 1565 } 1566 } 1567 return NULL; 1568} 1569EXPORT_SYMBOL(sock_wmalloc); 1570 1571/* 1572 * Allocate a skb from the socket's receive buffer. 1573 */ 1574struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1575 gfp_t priority) 1576{ 1577 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1578 struct sk_buff *skb = alloc_skb(size, priority); 1579 if (skb) { 1580 skb_set_owner_r(skb, sk); 1581 return skb; 1582 } 1583 } 1584 return NULL; 1585} 1586 1587/* 1588 * Allocate a memory block from the socket's option memory buffer. 1589 */ 1590void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1591{ 1592 if ((unsigned int)size <= sysctl_optmem_max && 1593 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1594 void *mem; 1595 /* First do the add, to avoid the race if kmalloc 1596 * might sleep. 1597 */ 1598 atomic_add(size, &sk->sk_omem_alloc); 1599 mem = kmalloc(size, priority); 1600 if (mem) 1601 return mem; 1602 atomic_sub(size, &sk->sk_omem_alloc); 1603 } 1604 return NULL; 1605} 1606EXPORT_SYMBOL(sock_kmalloc); 1607 1608/* 1609 * Free an option memory block. 1610 */ 1611void sock_kfree_s(struct sock *sk, void *mem, int size) 1612{ 1613 kfree(mem); 1614 atomic_sub(size, &sk->sk_omem_alloc); 1615} 1616EXPORT_SYMBOL(sock_kfree_s); 1617 1618/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1619 I think, these locks should be removed for datagram sockets. 1620 */ 1621static long sock_wait_for_wmem(struct sock *sk, long timeo) 1622{ 1623 DEFINE_WAIT(wait); 1624 1625 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1626 for (;;) { 1627 if (!timeo) 1628 break; 1629 if (signal_pending(current)) 1630 break; 1631 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1632 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1633 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1634 break; 1635 if (sk->sk_shutdown & SEND_SHUTDOWN) 1636 break; 1637 if (sk->sk_err) 1638 break; 1639 timeo = schedule_timeout(timeo); 1640 } 1641 finish_wait(sk_sleep(sk), &wait); 1642 return timeo; 1643} 1644 1645 1646/* 1647 * Generic send/receive buffer handlers 1648 */ 1649 1650struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1651 unsigned long data_len, int noblock, 1652 int *errcode) 1653{ 1654 struct sk_buff *skb; 1655 gfp_t gfp_mask; 1656 long timeo; 1657 int err; 1658 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1659 1660 err = -EMSGSIZE; 1661 if (npages > MAX_SKB_FRAGS) 1662 goto failure; 1663 1664 gfp_mask = sk->sk_allocation; 1665 if (gfp_mask & __GFP_WAIT) 1666 gfp_mask |= __GFP_REPEAT; 1667 1668 timeo = sock_sndtimeo(sk, noblock); 1669 while (1) { 1670 err = sock_error(sk); 1671 if (err != 0) 1672 goto failure; 1673 1674 err = -EPIPE; 1675 if (sk->sk_shutdown & SEND_SHUTDOWN) 1676 goto failure; 1677 1678 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1679 skb = alloc_skb(header_len, gfp_mask); 1680 if (skb) { 1681 int i; 1682 1683 /* No pages, we're done... */ 1684 if (!data_len) 1685 break; 1686 1687 skb->truesize += data_len; 1688 skb_shinfo(skb)->nr_frags = npages; 1689 for (i = 0; i < npages; i++) { 1690 struct page *page; 1691 1692 page = alloc_pages(sk->sk_allocation, 0); 1693 if (!page) { 1694 err = -ENOBUFS; 1695 skb_shinfo(skb)->nr_frags = i; 1696 kfree_skb(skb); 1697 goto failure; 1698 } 1699 1700 __skb_fill_page_desc(skb, i, 1701 page, 0, 1702 (data_len >= PAGE_SIZE ? 1703 PAGE_SIZE : 1704 data_len)); 1705 data_len -= PAGE_SIZE; 1706 } 1707 1708 /* Full success... */ 1709 break; 1710 } 1711 err = -ENOBUFS; 1712 goto failure; 1713 } 1714 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1715 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1716 err = -EAGAIN; 1717 if (!timeo) 1718 goto failure; 1719 if (signal_pending(current)) 1720 goto interrupted; 1721 timeo = sock_wait_for_wmem(sk, timeo); 1722 } 1723 1724 skb_set_owner_w(skb, sk); 1725 return skb; 1726 1727interrupted: 1728 err = sock_intr_errno(timeo); 1729failure: 1730 *errcode = err; 1731 return NULL; 1732} 1733EXPORT_SYMBOL(sock_alloc_send_pskb); 1734 1735struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1736 int noblock, int *errcode) 1737{ 1738 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1739} 1740EXPORT_SYMBOL(sock_alloc_send_skb); 1741 1742static void __lock_sock(struct sock *sk) 1743 __releases(&sk->sk_lock.slock) 1744 __acquires(&sk->sk_lock.slock) 1745{ 1746 DEFINE_WAIT(wait); 1747 1748 for (;;) { 1749 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1750 TASK_UNINTERRUPTIBLE); 1751 spin_unlock_bh(&sk->sk_lock.slock); 1752 schedule(); 1753 spin_lock_bh(&sk->sk_lock.slock); 1754 if (!sock_owned_by_user(sk)) 1755 break; 1756 } 1757 finish_wait(&sk->sk_lock.wq, &wait); 1758} 1759 1760static void __release_sock(struct sock *sk) 1761 __releases(&sk->sk_lock.slock) 1762 __acquires(&sk->sk_lock.slock) 1763{ 1764 struct sk_buff *skb = sk->sk_backlog.head; 1765 1766 do { 1767 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1768 bh_unlock_sock(sk); 1769 1770 do { 1771 struct sk_buff *next = skb->next; 1772 1773 prefetch(next); 1774 WARN_ON_ONCE(skb_dst_is_noref(skb)); 1775 skb->next = NULL; 1776 sk_backlog_rcv(sk, skb); 1777 1778 /* 1779 * We are in process context here with softirqs 1780 * disabled, use cond_resched_softirq() to preempt. 1781 * This is safe to do because we've taken the backlog 1782 * queue private: 1783 */ 1784 cond_resched_softirq(); 1785 1786 skb = next; 1787 } while (skb != NULL); 1788 1789 bh_lock_sock(sk); 1790 } while ((skb = sk->sk_backlog.head) != NULL); 1791 1792 /* 1793 * Doing the zeroing here guarantee we can not loop forever 1794 * while a wild producer attempts to flood us. 1795 */ 1796 sk->sk_backlog.len = 0; 1797} 1798 1799/** 1800 * sk_wait_data - wait for data to arrive at sk_receive_queue 1801 * @sk: sock to wait on 1802 * @timeo: for how long 1803 * 1804 * Now socket state including sk->sk_err is changed only under lock, 1805 * hence we may omit checks after joining wait queue. 1806 * We check receive queue before schedule() only as optimization; 1807 * it is very likely that release_sock() added new data. 1808 */ 1809int sk_wait_data(struct sock *sk, long *timeo) 1810{ 1811 int rc; 1812 DEFINE_WAIT(wait); 1813 1814 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1815 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1816 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1817 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1818 finish_wait(sk_sleep(sk), &wait); 1819 return rc; 1820} 1821EXPORT_SYMBOL(sk_wait_data); 1822 1823/** 1824 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1825 * @sk: socket 1826 * @size: memory size to allocate 1827 * @kind: allocation type 1828 * 1829 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1830 * rmem allocation. This function assumes that protocols which have 1831 * memory_pressure use sk_wmem_queued as write buffer accounting. 1832 */ 1833int __sk_mem_schedule(struct sock *sk, int size, int kind) 1834{ 1835 struct proto *prot = sk->sk_prot; 1836 int amt = sk_mem_pages(size); 1837 long allocated; 1838 int parent_status = UNDER_LIMIT; 1839 1840 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1841 1842 allocated = sk_memory_allocated_add(sk, amt, &parent_status); 1843 1844 /* Under limit. */ 1845 if (parent_status == UNDER_LIMIT && 1846 allocated <= sk_prot_mem_limits(sk, 0)) { 1847 sk_leave_memory_pressure(sk); 1848 return 1; 1849 } 1850 1851 /* Under pressure. (we or our parents) */ 1852 if ((parent_status > SOFT_LIMIT) || 1853 allocated > sk_prot_mem_limits(sk, 1)) 1854 sk_enter_memory_pressure(sk); 1855 1856 /* Over hard limit (we or our parents) */ 1857 if ((parent_status == OVER_LIMIT) || 1858 (allocated > sk_prot_mem_limits(sk, 2))) 1859 goto suppress_allocation; 1860 1861 /* guarantee minimum buffer size under pressure */ 1862 if (kind == SK_MEM_RECV) { 1863 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1864 return 1; 1865 1866 } else { /* SK_MEM_SEND */ 1867 if (sk->sk_type == SOCK_STREAM) { 1868 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1869 return 1; 1870 } else if (atomic_read(&sk->sk_wmem_alloc) < 1871 prot->sysctl_wmem[0]) 1872 return 1; 1873 } 1874 1875 if (sk_has_memory_pressure(sk)) { 1876 int alloc; 1877 1878 if (!sk_under_memory_pressure(sk)) 1879 return 1; 1880 alloc = sk_sockets_allocated_read_positive(sk); 1881 if (sk_prot_mem_limits(sk, 2) > alloc * 1882 sk_mem_pages(sk->sk_wmem_queued + 1883 atomic_read(&sk->sk_rmem_alloc) + 1884 sk->sk_forward_alloc)) 1885 return 1; 1886 } 1887 1888suppress_allocation: 1889 1890 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1891 sk_stream_moderate_sndbuf(sk); 1892 1893 /* Fail only if socket is _under_ its sndbuf. 1894 * In this case we cannot block, so that we have to fail. 1895 */ 1896 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1897 return 1; 1898 } 1899 1900 trace_sock_exceed_buf_limit(sk, prot, allocated); 1901 1902 /* Alas. Undo changes. */ 1903 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1904 1905 sk_memory_allocated_sub(sk, amt); 1906 1907 return 0; 1908} 1909EXPORT_SYMBOL(__sk_mem_schedule); 1910 1911/** 1912 * __sk_reclaim - reclaim memory_allocated 1913 * @sk: socket 1914 */ 1915void __sk_mem_reclaim(struct sock *sk) 1916{ 1917 sk_memory_allocated_sub(sk, 1918 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); 1919 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1920 1921 if (sk_under_memory_pressure(sk) && 1922 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) 1923 sk_leave_memory_pressure(sk); 1924} 1925EXPORT_SYMBOL(__sk_mem_reclaim); 1926 1927 1928/* 1929 * Set of default routines for initialising struct proto_ops when 1930 * the protocol does not support a particular function. In certain 1931 * cases where it makes no sense for a protocol to have a "do nothing" 1932 * function, some default processing is provided. 1933 */ 1934 1935int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1936{ 1937 return -EOPNOTSUPP; 1938} 1939EXPORT_SYMBOL(sock_no_bind); 1940 1941int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1942 int len, int flags) 1943{ 1944 return -EOPNOTSUPP; 1945} 1946EXPORT_SYMBOL(sock_no_connect); 1947 1948int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1949{ 1950 return -EOPNOTSUPP; 1951} 1952EXPORT_SYMBOL(sock_no_socketpair); 1953 1954int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1955{ 1956 return -EOPNOTSUPP; 1957} 1958EXPORT_SYMBOL(sock_no_accept); 1959 1960int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1961 int *len, int peer) 1962{ 1963 return -EOPNOTSUPP; 1964} 1965EXPORT_SYMBOL(sock_no_getname); 1966 1967unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 1968{ 1969 return 0; 1970} 1971EXPORT_SYMBOL(sock_no_poll); 1972 1973int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1974{ 1975 return -EOPNOTSUPP; 1976} 1977EXPORT_SYMBOL(sock_no_ioctl); 1978 1979int sock_no_listen(struct socket *sock, int backlog) 1980{ 1981 return -EOPNOTSUPP; 1982} 1983EXPORT_SYMBOL(sock_no_listen); 1984 1985int sock_no_shutdown(struct socket *sock, int how) 1986{ 1987 return -EOPNOTSUPP; 1988} 1989EXPORT_SYMBOL(sock_no_shutdown); 1990 1991int sock_no_setsockopt(struct socket *sock, int level, int optname, 1992 char __user *optval, unsigned int optlen) 1993{ 1994 return -EOPNOTSUPP; 1995} 1996EXPORT_SYMBOL(sock_no_setsockopt); 1997 1998int sock_no_getsockopt(struct socket *sock, int level, int optname, 1999 char __user *optval, int __user *optlen) 2000{ 2001 return -EOPNOTSUPP; 2002} 2003EXPORT_SYMBOL(sock_no_getsockopt); 2004 2005int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 2006 size_t len) 2007{ 2008 return -EOPNOTSUPP; 2009} 2010EXPORT_SYMBOL(sock_no_sendmsg); 2011 2012int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 2013 size_t len, int flags) 2014{ 2015 return -EOPNOTSUPP; 2016} 2017EXPORT_SYMBOL(sock_no_recvmsg); 2018 2019int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 2020{ 2021 /* Mirror missing mmap method error code */ 2022 return -ENODEV; 2023} 2024EXPORT_SYMBOL(sock_no_mmap); 2025 2026ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 2027{ 2028 ssize_t res; 2029 struct msghdr msg = {.msg_flags = flags}; 2030 struct kvec iov; 2031 char *kaddr = kmap(page); 2032 iov.iov_base = kaddr + offset; 2033 iov.iov_len = size; 2034 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 2035 kunmap(page); 2036 return res; 2037} 2038EXPORT_SYMBOL(sock_no_sendpage); 2039 2040/* 2041 * Default Socket Callbacks 2042 */ 2043 2044static void sock_def_wakeup(struct sock *sk) 2045{ 2046 struct socket_wq *wq; 2047 2048 rcu_read_lock(); 2049 wq = rcu_dereference(sk->sk_wq); 2050 if (wq_has_sleeper(wq)) 2051 wake_up_interruptible_all(&wq->wait); 2052 rcu_read_unlock(); 2053} 2054 2055static void sock_def_error_report(struct sock *sk) 2056{ 2057 struct socket_wq *wq; 2058 2059 rcu_read_lock(); 2060 wq = rcu_dereference(sk->sk_wq); 2061 if (wq_has_sleeper(wq)) 2062 wake_up_interruptible_poll(&wq->wait, POLLERR); 2063 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 2064 rcu_read_unlock(); 2065} 2066 2067static void sock_def_readable(struct sock *sk, int len) 2068{ 2069 struct socket_wq *wq; 2070 2071 rcu_read_lock(); 2072 wq = rcu_dereference(sk->sk_wq); 2073 if (wq_has_sleeper(wq)) 2074 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | 2075 POLLRDNORM | POLLRDBAND); 2076 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 2077 rcu_read_unlock(); 2078} 2079 2080static void sock_def_write_space(struct sock *sk) 2081{ 2082 struct socket_wq *wq; 2083 2084 rcu_read_lock(); 2085 2086 /* Do not wake up a writer until he can make "significant" 2087 * progress. --DaveM 2088 */ 2089 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 2090 wq = rcu_dereference(sk->sk_wq); 2091 if (wq_has_sleeper(wq)) 2092 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 2093 POLLWRNORM | POLLWRBAND); 2094 2095 /* Should agree with poll, otherwise some programs break */ 2096 if (sock_writeable(sk)) 2097 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 2098 } 2099 2100 rcu_read_unlock(); 2101} 2102 2103static void sock_def_destruct(struct sock *sk) 2104{ 2105 kfree(sk->sk_protinfo); 2106} 2107 2108void sk_send_sigurg(struct sock *sk) 2109{ 2110 if (sk->sk_socket && sk->sk_socket->file) 2111 if (send_sigurg(&sk->sk_socket->file->f_owner)) 2112 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 2113} 2114EXPORT_SYMBOL(sk_send_sigurg); 2115 2116void sk_reset_timer(struct sock *sk, struct timer_list* timer, 2117 unsigned long expires) 2118{ 2119 if (!mod_timer(timer, expires)) 2120 sock_hold(sk); 2121} 2122EXPORT_SYMBOL(sk_reset_timer); 2123 2124void sk_stop_timer(struct sock *sk, struct timer_list* timer) 2125{ 2126 if (timer_pending(timer) && del_timer(timer)) 2127 __sock_put(sk); 2128} 2129EXPORT_SYMBOL(sk_stop_timer); 2130 2131void sock_init_data(struct socket *sock, struct sock *sk) 2132{ 2133 skb_queue_head_init(&sk->sk_receive_queue); 2134 skb_queue_head_init(&sk->sk_write_queue); 2135 skb_queue_head_init(&sk->sk_error_queue); 2136#ifdef CONFIG_NET_DMA 2137 skb_queue_head_init(&sk->sk_async_wait_queue); 2138#endif 2139 2140 sk->sk_send_head = NULL; 2141 2142 init_timer(&sk->sk_timer); 2143 2144 sk->sk_allocation = GFP_KERNEL; 2145 sk->sk_rcvbuf = sysctl_rmem_default; 2146 sk->sk_sndbuf = sysctl_wmem_default; 2147 sk->sk_state = TCP_CLOSE; 2148 sk_set_socket(sk, sock); 2149 2150 sock_set_flag(sk, SOCK_ZAPPED); 2151 2152 if (sock) { 2153 sk->sk_type = sock->type; 2154 sk->sk_wq = sock->wq; 2155 sock->sk = sk; 2156 } else 2157 sk->sk_wq = NULL; 2158 2159 spin_lock_init(&sk->sk_dst_lock); 2160 rwlock_init(&sk->sk_callback_lock); 2161 lockdep_set_class_and_name(&sk->sk_callback_lock, 2162 af_callback_keys + sk->sk_family, 2163 af_family_clock_key_strings[sk->sk_family]); 2164 2165 sk->sk_state_change = sock_def_wakeup; 2166 sk->sk_data_ready = sock_def_readable; 2167 sk->sk_write_space = sock_def_write_space; 2168 sk->sk_error_report = sock_def_error_report; 2169 sk->sk_destruct = sock_def_destruct; 2170 2171 sk->sk_sndmsg_page = NULL; 2172 sk->sk_sndmsg_off = 0; 2173 sk->sk_peek_off = -1; 2174 2175 sk->sk_peer_pid = NULL; 2176 sk->sk_peer_cred = NULL; 2177 sk->sk_write_pending = 0; 2178 sk->sk_rcvlowat = 1; 2179 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2180 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2181 2182 sk->sk_stamp = ktime_set(-1L, 0); 2183 2184 /* 2185 * Before updating sk_refcnt, we must commit prior changes to memory 2186 * (Documentation/RCU/rculist_nulls.txt for details) 2187 */ 2188 smp_wmb(); 2189 atomic_set(&sk->sk_refcnt, 1); 2190 atomic_set(&sk->sk_drops, 0); 2191} 2192EXPORT_SYMBOL(sock_init_data); 2193 2194void lock_sock_nested(struct sock *sk, int subclass) 2195{ 2196 might_sleep(); 2197 spin_lock_bh(&sk->sk_lock.slock); 2198 if (sk->sk_lock.owned) 2199 __lock_sock(sk); 2200 sk->sk_lock.owned = 1; 2201 spin_unlock(&sk->sk_lock.slock); 2202 /* 2203 * The sk_lock has mutex_lock() semantics here: 2204 */ 2205 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2206 local_bh_enable(); 2207} 2208EXPORT_SYMBOL(lock_sock_nested); 2209 2210void release_sock(struct sock *sk) 2211{ 2212 /* 2213 * The sk_lock has mutex_unlock() semantics: 2214 */ 2215 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 2216 2217 spin_lock_bh(&sk->sk_lock.slock); 2218 if (sk->sk_backlog.tail) 2219 __release_sock(sk); 2220 2221 if (sk->sk_prot->release_cb) 2222 sk->sk_prot->release_cb(sk); 2223 2224 sk->sk_lock.owned = 0; 2225 if (waitqueue_active(&sk->sk_lock.wq)) 2226 wake_up(&sk->sk_lock.wq); 2227 spin_unlock_bh(&sk->sk_lock.slock); 2228} 2229EXPORT_SYMBOL(release_sock); 2230 2231/** 2232 * lock_sock_fast - fast version of lock_sock 2233 * @sk: socket 2234 * 2235 * This version should be used for very small section, where process wont block 2236 * return false if fast path is taken 2237 * sk_lock.slock locked, owned = 0, BH disabled 2238 * return true if slow path is taken 2239 * sk_lock.slock unlocked, owned = 1, BH enabled 2240 */ 2241bool lock_sock_fast(struct sock *sk) 2242{ 2243 might_sleep(); 2244 spin_lock_bh(&sk->sk_lock.slock); 2245 2246 if (!sk->sk_lock.owned) 2247 /* 2248 * Note : We must disable BH 2249 */ 2250 return false; 2251 2252 __lock_sock(sk); 2253 sk->sk_lock.owned = 1; 2254 spin_unlock(&sk->sk_lock.slock); 2255 /* 2256 * The sk_lock has mutex_lock() semantics here: 2257 */ 2258 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2259 local_bh_enable(); 2260 return true; 2261} 2262EXPORT_SYMBOL(lock_sock_fast); 2263 2264int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2265{ 2266 struct timeval tv; 2267 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2268 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2269 tv = ktime_to_timeval(sk->sk_stamp); 2270 if (tv.tv_sec == -1) 2271 return -ENOENT; 2272 if (tv.tv_sec == 0) { 2273 sk->sk_stamp = ktime_get_real(); 2274 tv = ktime_to_timeval(sk->sk_stamp); 2275 } 2276 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2277} 2278EXPORT_SYMBOL(sock_get_timestamp); 2279 2280int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2281{ 2282 struct timespec ts; 2283 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2284 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2285 ts = ktime_to_timespec(sk->sk_stamp); 2286 if (ts.tv_sec == -1) 2287 return -ENOENT; 2288 if (ts.tv_sec == 0) { 2289 sk->sk_stamp = ktime_get_real(); 2290 ts = ktime_to_timespec(sk->sk_stamp); 2291 } 2292 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2293} 2294EXPORT_SYMBOL(sock_get_timestampns); 2295 2296void sock_enable_timestamp(struct sock *sk, int flag) 2297{ 2298 if (!sock_flag(sk, flag)) { 2299 unsigned long previous_flags = sk->sk_flags; 2300 2301 sock_set_flag(sk, flag); 2302 /* 2303 * we just set one of the two flags which require net 2304 * time stamping, but time stamping might have been on 2305 * already because of the other one 2306 */ 2307 if (!(previous_flags & SK_FLAGS_TIMESTAMP)) 2308 net_enable_timestamp(); 2309 } 2310} 2311 2312/* 2313 * Get a socket option on an socket. 2314 * 2315 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2316 * asynchronous errors should be reported by getsockopt. We assume 2317 * this means if you specify SO_ERROR (otherwise whats the point of it). 2318 */ 2319int sock_common_getsockopt(struct socket *sock, int level, int optname, 2320 char __user *optval, int __user *optlen) 2321{ 2322 struct sock *sk = sock->sk; 2323 2324 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2325} 2326EXPORT_SYMBOL(sock_common_getsockopt); 2327 2328#ifdef CONFIG_COMPAT 2329int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2330 char __user *optval, int __user *optlen) 2331{ 2332 struct sock *sk = sock->sk; 2333 2334 if (sk->sk_prot->compat_getsockopt != NULL) 2335 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2336 optval, optlen); 2337 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2338} 2339EXPORT_SYMBOL(compat_sock_common_getsockopt); 2340#endif 2341 2342int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 2343 struct msghdr *msg, size_t size, int flags) 2344{ 2345 struct sock *sk = sock->sk; 2346 int addr_len = 0; 2347 int err; 2348 2349 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 2350 flags & ~MSG_DONTWAIT, &addr_len); 2351 if (err >= 0) 2352 msg->msg_namelen = addr_len; 2353 return err; 2354} 2355EXPORT_SYMBOL(sock_common_recvmsg); 2356 2357/* 2358 * Set socket options on an inet socket. 2359 */ 2360int sock_common_setsockopt(struct socket *sock, int level, int optname, 2361 char __user *optval, unsigned int optlen) 2362{ 2363 struct sock *sk = sock->sk; 2364 2365 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2366} 2367EXPORT_SYMBOL(sock_common_setsockopt); 2368 2369#ifdef CONFIG_COMPAT 2370int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2371 char __user *optval, unsigned int optlen) 2372{ 2373 struct sock *sk = sock->sk; 2374 2375 if (sk->sk_prot->compat_setsockopt != NULL) 2376 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2377 optval, optlen); 2378 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2379} 2380EXPORT_SYMBOL(compat_sock_common_setsockopt); 2381#endif 2382 2383void sk_common_release(struct sock *sk) 2384{ 2385 if (sk->sk_prot->destroy) 2386 sk->sk_prot->destroy(sk); 2387 2388 /* 2389 * Observation: when sock_common_release is called, processes have 2390 * no access to socket. But net still has. 2391 * Step one, detach it from networking: 2392 * 2393 * A. Remove from hash tables. 2394 */ 2395 2396 sk->sk_prot->unhash(sk); 2397 2398 /* 2399 * In this point socket cannot receive new packets, but it is possible 2400 * that some packets are in flight because some CPU runs receiver and 2401 * did hash table lookup before we unhashed socket. They will achieve 2402 * receive queue and will be purged by socket destructor. 2403 * 2404 * Also we still have packets pending on receive queue and probably, 2405 * our own packets waiting in device queues. sock_destroy will drain 2406 * receive queue, but transmitted packets will delay socket destruction 2407 * until the last reference will be released. 2408 */ 2409 2410 sock_orphan(sk); 2411 2412 xfrm_sk_free_policy(sk); 2413 2414 sk_refcnt_debug_release(sk); 2415 sock_put(sk); 2416} 2417EXPORT_SYMBOL(sk_common_release); 2418 2419#ifdef CONFIG_PROC_FS 2420#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 2421struct prot_inuse { 2422 int val[PROTO_INUSE_NR]; 2423}; 2424 2425static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2426 2427#ifdef CONFIG_NET_NS 2428void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2429{ 2430 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 2431} 2432EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2433 2434int sock_prot_inuse_get(struct net *net, struct proto *prot) 2435{ 2436 int cpu, idx = prot->inuse_idx; 2437 int res = 0; 2438 2439 for_each_possible_cpu(cpu) 2440 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2441 2442 return res >= 0 ? res : 0; 2443} 2444EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2445 2446static int __net_init sock_inuse_init_net(struct net *net) 2447{ 2448 net->core.inuse = alloc_percpu(struct prot_inuse); 2449 return net->core.inuse ? 0 : -ENOMEM; 2450} 2451 2452static void __net_exit sock_inuse_exit_net(struct net *net) 2453{ 2454 free_percpu(net->core.inuse); 2455} 2456 2457static struct pernet_operations net_inuse_ops = { 2458 .init = sock_inuse_init_net, 2459 .exit = sock_inuse_exit_net, 2460}; 2461 2462static __init int net_inuse_init(void) 2463{ 2464 if (register_pernet_subsys(&net_inuse_ops)) 2465 panic("Cannot initialize net inuse counters"); 2466 2467 return 0; 2468} 2469 2470core_initcall(net_inuse_init); 2471#else 2472static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2473 2474void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2475{ 2476 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 2477} 2478EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2479 2480int sock_prot_inuse_get(struct net *net, struct proto *prot) 2481{ 2482 int cpu, idx = prot->inuse_idx; 2483 int res = 0; 2484 2485 for_each_possible_cpu(cpu) 2486 res += per_cpu(prot_inuse, cpu).val[idx]; 2487 2488 return res >= 0 ? res : 0; 2489} 2490EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2491#endif 2492 2493static void assign_proto_idx(struct proto *prot) 2494{ 2495 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2496 2497 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2498 pr_err("PROTO_INUSE_NR exhausted\n"); 2499 return; 2500 } 2501 2502 set_bit(prot->inuse_idx, proto_inuse_idx); 2503} 2504 2505static void release_proto_idx(struct proto *prot) 2506{ 2507 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2508 clear_bit(prot->inuse_idx, proto_inuse_idx); 2509} 2510#else 2511static inline void assign_proto_idx(struct proto *prot) 2512{ 2513} 2514 2515static inline void release_proto_idx(struct proto *prot) 2516{ 2517} 2518#endif 2519 2520int proto_register(struct proto *prot, int alloc_slab) 2521{ 2522 if (alloc_slab) { 2523 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2524 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2525 NULL); 2526 2527 if (prot->slab == NULL) { 2528 pr_crit("%s: Can't create sock SLAB cache!\n", 2529 prot->name); 2530 goto out; 2531 } 2532 2533 if (prot->rsk_prot != NULL) { 2534 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); 2535 if (prot->rsk_prot->slab_name == NULL) 2536 goto out_free_sock_slab; 2537 2538 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2539 prot->rsk_prot->obj_size, 0, 2540 SLAB_HWCACHE_ALIGN, NULL); 2541 2542 if (prot->rsk_prot->slab == NULL) { 2543 pr_crit("%s: Can't create request sock SLAB cache!\n", 2544 prot->name); 2545 goto out_free_request_sock_slab_name; 2546 } 2547 } 2548 2549 if (prot->twsk_prot != NULL) { 2550 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 2551 2552 if (prot->twsk_prot->twsk_slab_name == NULL) 2553 goto out_free_request_sock_slab; 2554 2555 prot->twsk_prot->twsk_slab = 2556 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2557 prot->twsk_prot->twsk_obj_size, 2558 0, 2559 SLAB_HWCACHE_ALIGN | 2560 prot->slab_flags, 2561 NULL); 2562 if (prot->twsk_prot->twsk_slab == NULL) 2563 goto out_free_timewait_sock_slab_name; 2564 } 2565 } 2566 2567 mutex_lock(&proto_list_mutex); 2568 list_add(&prot->node, &proto_list); 2569 assign_proto_idx(prot); 2570 mutex_unlock(&proto_list_mutex); 2571 return 0; 2572 2573out_free_timewait_sock_slab_name: 2574 kfree(prot->twsk_prot->twsk_slab_name); 2575out_free_request_sock_slab: 2576 if (prot->rsk_prot && prot->rsk_prot->slab) { 2577 kmem_cache_destroy(prot->rsk_prot->slab); 2578 prot->rsk_prot->slab = NULL; 2579 } 2580out_free_request_sock_slab_name: 2581 if (prot->rsk_prot) 2582 kfree(prot->rsk_prot->slab_name); 2583out_free_sock_slab: 2584 kmem_cache_destroy(prot->slab); 2585 prot->slab = NULL; 2586out: 2587 return -ENOBUFS; 2588} 2589EXPORT_SYMBOL(proto_register); 2590 2591void proto_unregister(struct proto *prot) 2592{ 2593 mutex_lock(&proto_list_mutex); 2594 release_proto_idx(prot); 2595 list_del(&prot->node); 2596 mutex_unlock(&proto_list_mutex); 2597 2598 if (prot->slab != NULL) { 2599 kmem_cache_destroy(prot->slab); 2600 prot->slab = NULL; 2601 } 2602 2603 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2604 kmem_cache_destroy(prot->rsk_prot->slab); 2605 kfree(prot->rsk_prot->slab_name); 2606 prot->rsk_prot->slab = NULL; 2607 } 2608 2609 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2610 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2611 kfree(prot->twsk_prot->twsk_slab_name); 2612 prot->twsk_prot->twsk_slab = NULL; 2613 } 2614} 2615EXPORT_SYMBOL(proto_unregister); 2616 2617#ifdef CONFIG_PROC_FS 2618static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2619 __acquires(proto_list_mutex) 2620{ 2621 mutex_lock(&proto_list_mutex); 2622 return seq_list_start_head(&proto_list, *pos); 2623} 2624 2625static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2626{ 2627 return seq_list_next(v, &proto_list, pos); 2628} 2629 2630static void proto_seq_stop(struct seq_file *seq, void *v) 2631 __releases(proto_list_mutex) 2632{ 2633 mutex_unlock(&proto_list_mutex); 2634} 2635 2636static char proto_method_implemented(const void *method) 2637{ 2638 return method == NULL ? 'n' : 'y'; 2639} 2640static long sock_prot_memory_allocated(struct proto *proto) 2641{ 2642 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; 2643} 2644 2645static char *sock_prot_memory_pressure(struct proto *proto) 2646{ 2647 return proto->memory_pressure != NULL ? 2648 proto_memory_pressure(proto) ? "yes" : "no" : "NI"; 2649} 2650 2651static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2652{ 2653 2654 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 2655 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2656 proto->name, 2657 proto->obj_size, 2658 sock_prot_inuse_get(seq_file_net(seq), proto), 2659 sock_prot_memory_allocated(proto), 2660 sock_prot_memory_pressure(proto), 2661 proto->max_header, 2662 proto->slab == NULL ? "no" : "yes", 2663 module_name(proto->owner), 2664 proto_method_implemented(proto->close), 2665 proto_method_implemented(proto->connect), 2666 proto_method_implemented(proto->disconnect), 2667 proto_method_implemented(proto->accept), 2668 proto_method_implemented(proto->ioctl), 2669 proto_method_implemented(proto->init), 2670 proto_method_implemented(proto->destroy), 2671 proto_method_implemented(proto->shutdown), 2672 proto_method_implemented(proto->setsockopt), 2673 proto_method_implemented(proto->getsockopt), 2674 proto_method_implemented(proto->sendmsg), 2675 proto_method_implemented(proto->recvmsg), 2676 proto_method_implemented(proto->sendpage), 2677 proto_method_implemented(proto->bind), 2678 proto_method_implemented(proto->backlog_rcv), 2679 proto_method_implemented(proto->hash), 2680 proto_method_implemented(proto->unhash), 2681 proto_method_implemented(proto->get_port), 2682 proto_method_implemented(proto->enter_memory_pressure)); 2683} 2684 2685static int proto_seq_show(struct seq_file *seq, void *v) 2686{ 2687 if (v == &proto_list) 2688 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2689 "protocol", 2690 "size", 2691 "sockets", 2692 "memory", 2693 "press", 2694 "maxhdr", 2695 "slab", 2696 "module", 2697 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2698 else 2699 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2700 return 0; 2701} 2702 2703static const struct seq_operations proto_seq_ops = { 2704 .start = proto_seq_start, 2705 .next = proto_seq_next, 2706 .stop = proto_seq_stop, 2707 .show = proto_seq_show, 2708}; 2709 2710static int proto_seq_open(struct inode *inode, struct file *file) 2711{ 2712 return seq_open_net(inode, file, &proto_seq_ops, 2713 sizeof(struct seq_net_private)); 2714} 2715 2716static const struct file_operations proto_seq_fops = { 2717 .owner = THIS_MODULE, 2718 .open = proto_seq_open, 2719 .read = seq_read, 2720 .llseek = seq_lseek, 2721 .release = seq_release_net, 2722}; 2723 2724static __net_init int proto_init_net(struct net *net) 2725{ 2726 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2727 return -ENOMEM; 2728 2729 return 0; 2730} 2731 2732static __net_exit void proto_exit_net(struct net *net) 2733{ 2734 proc_net_remove(net, "protocols"); 2735} 2736 2737 2738static __net_initdata struct pernet_operations proto_net_ops = { 2739 .init = proto_init_net, 2740 .exit = proto_exit_net, 2741}; 2742 2743static int __init proto_init(void) 2744{ 2745 return register_pernet_subsys(&proto_net_ops); 2746} 2747 2748subsys_initcall(proto_init); 2749 2750#endif /* PROC_FS */ 2751