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 * Definitions for the AF_INET socket handler. 7 * 8 * Version: @(#)sock.h 1.0.4 05/13/93 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Corey Minyard <wf-rch!minyard@relay.EU.net> 13 * Florian La Roche <flla@stud.uni-sb.de> 14 * 15 * Fixes: 16 * Alan Cox : Volatiles in skbuff pointers. See 17 * skbuff comments. May be overdone, 18 * better to prove they can be removed 19 * than the reverse. 20 * Alan Cox : Added a zapped field for tcp to note 21 * a socket is reset and must stay shut up 22 * Alan Cox : New fields for options 23 * Pauline Middelink : identd support 24 * Alan Cox : Eliminate low level recv/recvfrom 25 * David S. Miller : New socket lookup architecture. 26 * Steve Whitehouse: Default routines for sock_ops 27 * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made 28 * protinfo be just a void pointer, as the 29 * protocol specific parts were moved to 30 * respective headers and ipv4/v6, etc now 31 * use private slabcaches for its socks 32 * Pedro Hortas : New flags field for socket options 33 * 34 * 35 * This program is free software; you can redistribute it and/or 36 * modify it under the terms of the GNU General Public License 37 * as published by the Free Software Foundation; either version 38 * 2 of the License, or (at your option) any later version. 39 */ 40 #ifndef _SOCK_H 41 #define _SOCK_H 42 43 #include <linux/kernel.h> 44 #include <linux/list.h> 45 #include <linux/timer.h> 46 #include <linux/cache.h> 47 #include <linux/module.h> 48 #include <linux/lockdep.h> 49 #include <linux/netdevice.h> 50 #include <linux/skbuff.h> /* struct sk_buff */ 51 #include <linux/mm.h> 52 #include <linux/security.h> 53 54 #include <linux/filter.h> 55 56 #include <asm/atomic.h> 57 #include <net/dst.h> 58 #include <net/checksum.h> 59 #include <net/net_namespace.h> 60 61 /* 62 * This structure really needs to be cleaned up. 63 * Most of it is for TCP, and not used by any of 64 * the other protocols. 65 */ 66 67 /* Define this to get the SOCK_DBG debugging facility. */ 68 #define SOCK_DEBUGGING 69 #ifdef SOCK_DEBUGGING 70 #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ 71 printk(KERN_DEBUG msg); } while (0) 72 #else 73 #define SOCK_DEBUG(sk, msg...) do { } while (0) 74 #endif 75 76 /* This is the per-socket lock. The spinlock provides a synchronization 77 * between user contexts and software interrupt processing, whereas the 78 * mini-semaphore synchronizes multiple users amongst themselves. 79 */ 80 typedef struct { 81 spinlock_t slock; 82 int owned; 83 wait_queue_head_t wq; 84 /* 85 * We express the mutex-alike socket_lock semantics 86 * to the lock validator by explicitly managing 87 * the slock as a lock variant (in addition to 88 * the slock itself): 89 */ 90 #ifdef CONFIG_DEBUG_LOCK_ALLOC 91 struct lockdep_map dep_map; 92 #endif 93 } socket_lock_t; 94 95 struct sock; 96 struct proto; 97 98 /** 99 * struct sock_common - minimal network layer representation of sockets 100 * @skc_family: network address family 101 * @skc_state: Connection state 102 * @skc_reuse: %SO_REUSEADDR setting 103 * @skc_bound_dev_if: bound device index if != 0 104 * @skc_node: main hash linkage for various protocol lookup tables 105 * @skc_bind_node: bind hash linkage for various protocol lookup tables 106 * @skc_refcnt: reference count 107 * @skc_hash: hash value used with various protocol lookup tables 108 * @skc_prot: protocol handlers inside a network family 109 * @skc_net: reference to the network namespace of this socket 110 * 111 * This is the minimal network layer representation of sockets, the header 112 * for struct sock and struct inet_timewait_sock. 113 */ 114 struct sock_common { 115 unsigned short skc_family; 116 volatile unsigned char skc_state; 117 unsigned char skc_reuse; 118 int skc_bound_dev_if; 119 struct hlist_node skc_node; 120 struct hlist_node skc_bind_node; 121 atomic_t skc_refcnt; 122 unsigned int skc_hash; 123 struct proto *skc_prot; 124 struct net *skc_net; 125 }; 126 127 /** 128 * struct sock - network layer representation of sockets 129 * @__sk_common: shared layout with inet_timewait_sock 130 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN 131 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings 132 * @sk_lock: synchronizer 133 * @sk_rcvbuf: size of receive buffer in bytes 134 * @sk_sleep: sock wait queue 135 * @sk_dst_cache: destination cache 136 * @sk_dst_lock: destination cache lock 137 * @sk_policy: flow policy 138 * @sk_rmem_alloc: receive queue bytes committed 139 * @sk_receive_queue: incoming packets 140 * @sk_wmem_alloc: transmit queue bytes committed 141 * @sk_write_queue: Packet sending queue 142 * @sk_async_wait_queue: DMA copied packets 143 * @sk_omem_alloc: "o" is "option" or "other" 144 * @sk_wmem_queued: persistent queue size 145 * @sk_forward_alloc: space allocated forward 146 * @sk_allocation: allocation mode 147 * @sk_sndbuf: size of send buffer in bytes 148 * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, %SO_OOBINLINE settings 149 * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets 150 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) 151 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) 152 * @sk_lingertime: %SO_LINGER l_linger setting 153 * @sk_backlog: always used with the per-socket spinlock held 154 * @sk_callback_lock: used with the callbacks in the end of this struct 155 * @sk_error_queue: rarely used 156 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, IPV6_ADDRFORM for instance) 157 * @sk_err: last error 158 * @sk_err_soft: errors that don't cause failure but are the cause of a persistent failure not just 'timed out' 159 * @sk_ack_backlog: current listen backlog 160 * @sk_max_ack_backlog: listen backlog set in listen() 161 * @sk_priority: %SO_PRIORITY setting 162 * @sk_type: socket type (%SOCK_STREAM, etc) 163 * @sk_protocol: which protocol this socket belongs in this network family 164 * @sk_peercred: %SO_PEERCRED setting 165 * @sk_rcvlowat: %SO_RCVLOWAT setting 166 * @sk_rcvtimeo: %SO_RCVTIMEO setting 167 * @sk_sndtimeo: %SO_SNDTIMEO setting 168 * @sk_filter: socket filtering instructions 169 * @sk_protinfo: private area, net family specific, when not using slab 170 * @sk_timer: sock cleanup timer 171 * @sk_stamp: time stamp of last packet received 172 * @sk_socket: Identd and reporting IO signals 173 * @sk_user_data: RPC layer private data 174 * @sk_sndmsg_page: cached page for sendmsg 175 * @sk_sndmsg_off: cached offset for sendmsg 176 * @sk_send_head: front of stuff to transmit 177 * @sk_security: used by security modules 178 * @sk_write_pending: a write to stream socket waits to start 179 * @sk_state_change: callback to indicate change in the state of the sock 180 * @sk_data_ready: callback to indicate there is data to be processed 181 * @sk_write_space: callback to indicate there is bf sending space available 182 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) 183 * @sk_backlog_rcv: callback to process the backlog 184 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 185 */ 186 struct sock { 187 /* 188 * Now struct inet_timewait_sock also uses sock_common, so please just 189 * don't add nothing before this first member (__sk_common) --acme 190 */ 191 struct sock_common __sk_common; 192 #define sk_family __sk_common.skc_family 193 #define sk_state __sk_common.skc_state 194 #define sk_reuse __sk_common.skc_reuse 195 #define sk_bound_dev_if __sk_common.skc_bound_dev_if 196 #define sk_node __sk_common.skc_node 197 #define sk_bind_node __sk_common.skc_bind_node 198 #define sk_refcnt __sk_common.skc_refcnt 199 #define sk_hash __sk_common.skc_hash 200 #define sk_prot __sk_common.skc_prot 201 #define sk_net __sk_common.skc_net 202 unsigned char sk_shutdown : 2, 203 sk_no_check : 2, 204 sk_userlocks : 4; 205 unsigned char sk_protocol; 206 unsigned short sk_type; 207 int sk_rcvbuf; 208 socket_lock_t sk_lock; 209 /* 210 * The backlog queue is special, it is always used with 211 * the per-socket spinlock held and requires low latency 212 * access. Therefore we special case it's implementation. 213 */ 214 struct { 215 struct sk_buff *head; 216 struct sk_buff *tail; 217 } sk_backlog; 218 wait_queue_head_t *sk_sleep; 219 struct dst_entry *sk_dst_cache; 220 struct xfrm_policy *sk_policy[2]; 221 rwlock_t sk_dst_lock; 222 atomic_t sk_rmem_alloc; 223 atomic_t sk_wmem_alloc; 224 atomic_t sk_omem_alloc; 225 int sk_sndbuf; 226 struct sk_buff_head sk_receive_queue; 227 struct sk_buff_head sk_write_queue; 228 struct sk_buff_head sk_async_wait_queue; 229 int sk_wmem_queued; 230 int sk_forward_alloc; 231 gfp_t sk_allocation; 232 int sk_route_caps; 233 int sk_gso_type; 234 int sk_rcvlowat; 235 unsigned long sk_flags; 236 unsigned long sk_lingertime; 237 struct sk_buff_head sk_error_queue; 238 struct proto *sk_prot_creator; 239 rwlock_t sk_callback_lock; 240 int sk_err, 241 sk_err_soft; 242 unsigned short sk_ack_backlog; 243 unsigned short sk_max_ack_backlog; 244 __u32 sk_priority; 245 struct ucred sk_peercred; 246 long sk_rcvtimeo; 247 long sk_sndtimeo; 248 struct sk_filter *sk_filter; 249 void *sk_protinfo; 250 struct timer_list sk_timer; 251 ktime_t sk_stamp; 252 struct socket *sk_socket; 253 void *sk_user_data; 254 struct page *sk_sndmsg_page; 255 struct sk_buff *sk_send_head; 256 __u32 sk_sndmsg_off; 257 int sk_write_pending; 258 void *sk_security; 259 void (*sk_state_change)(struct sock *sk); 260 void (*sk_data_ready)(struct sock *sk, int bytes); 261 void (*sk_write_space)(struct sock *sk); 262 void (*sk_error_report)(struct sock *sk); 263 int (*sk_backlog_rcv)(struct sock *sk, 264 struct sk_buff *skb); 265 void (*sk_destruct)(struct sock *sk); 266 }; 267 268 /* 269 * Hashed lists helper routines 270 */ 271 static inline struct sock *__sk_head(const struct hlist_head *head) 272 { 273 return hlist_entry(head->first, struct sock, sk_node); 274 } 275 276 static inline struct sock *sk_head(const struct hlist_head *head) 277 { 278 return hlist_empty(head) ? NULL : __sk_head(head); 279 } 280 281 static inline struct sock *sk_next(const struct sock *sk) 282 { 283 return sk->sk_node.next ? 284 hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; 285 } 286 287 static inline int sk_unhashed(const struct sock *sk) 288 { 289 return hlist_unhashed(&sk->sk_node); 290 } 291 292 static inline int sk_hashed(const struct sock *sk) 293 { 294 return !sk_unhashed(sk); 295 } 296 297 static __inline__ void sk_node_init(struct hlist_node *node) 298 { 299 node->pprev = NULL; 300 } 301 302 static __inline__ void __sk_del_node(struct sock *sk) 303 { 304 __hlist_del(&sk->sk_node); 305 } 306 307 static __inline__ int __sk_del_node_init(struct sock *sk) 308 { 309 if (sk_hashed(sk)) { 310 __sk_del_node(sk); 311 sk_node_init(&sk->sk_node); 312 return 1; 313 } 314 return 0; 315 } 316 317 /* Grab socket reference count. This operation is valid only 318 when sk is ALREADY grabbed f.e. it is found in hash table 319 or a list and the lookup is made under lock preventing hash table 320 modifications. 321 */ 322 323 static inline void sock_hold(struct sock *sk) 324 { 325 atomic_inc(&sk->sk_refcnt); 326 } 327 328 /* Ungrab socket in the context, which assumes that socket refcnt 329 cannot hit zero, f.e. it is true in context of any socketcall. 330 */ 331 static inline void __sock_put(struct sock *sk) 332 { 333 atomic_dec(&sk->sk_refcnt); 334 } 335 336 static __inline__ int sk_del_node_init(struct sock *sk) 337 { 338 int rc = __sk_del_node_init(sk); 339 340 if (rc) { 341 /* paranoid for a while -acme */ 342 WARN_ON(atomic_read(&sk->sk_refcnt) == 1); 343 __sock_put(sk); 344 } 345 return rc; 346 } 347 348 static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) 349 { 350 hlist_add_head(&sk->sk_node, list); 351 } 352 353 static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) 354 { 355 sock_hold(sk); 356 __sk_add_node(sk, list); 357 } 358 359 static __inline__ void __sk_del_bind_node(struct sock *sk) 360 { 361 __hlist_del(&sk->sk_bind_node); 362 } 363 364 static __inline__ void sk_add_bind_node(struct sock *sk, 365 struct hlist_head *list) 366 { 367 hlist_add_head(&sk->sk_bind_node, list); 368 } 369 370 #define sk_for_each(__sk, node, list) \ 371 hlist_for_each_entry(__sk, node, list, sk_node) 372 #define sk_for_each_from(__sk, node) \ 373 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ 374 hlist_for_each_entry_from(__sk, node, sk_node) 375 #define sk_for_each_continue(__sk, node) \ 376 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ 377 hlist_for_each_entry_continue(__sk, node, sk_node) 378 #define sk_for_each_safe(__sk, node, tmp, list) \ 379 hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) 380 #define sk_for_each_bound(__sk, node, list) \ 381 hlist_for_each_entry(__sk, node, list, sk_bind_node) 382 383 /* Sock flags */ 384 enum sock_flags { 385 SOCK_DEAD, 386 SOCK_DONE, 387 SOCK_URGINLINE, 388 SOCK_KEEPOPEN, 389 SOCK_LINGER, 390 SOCK_DESTROY, 391 SOCK_BROADCAST, 392 SOCK_TIMESTAMP, 393 SOCK_ZAPPED, 394 SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ 395 SOCK_DBG, /* %SO_DEBUG setting */ 396 SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ 397 SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ 398 SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ 399 SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ 400 }; 401 402 static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) 403 { 404 nsk->sk_flags = osk->sk_flags; 405 } 406 407 static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) 408 { 409 __set_bit(flag, &sk->sk_flags); 410 } 411 412 static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) 413 { 414 __clear_bit(flag, &sk->sk_flags); 415 } 416 417 static inline int sock_flag(struct sock *sk, enum sock_flags flag) 418 { 419 return test_bit(flag, &sk->sk_flags); 420 } 421 422 static inline void sk_acceptq_removed(struct sock *sk) 423 { 424 sk->sk_ack_backlog--; 425 } 426 427 static inline void sk_acceptq_added(struct sock *sk) 428 { 429 sk->sk_ack_backlog++; 430 } 431 432 static inline int sk_acceptq_is_full(struct sock *sk) 433 { 434 return sk->sk_ack_backlog > sk->sk_max_ack_backlog; 435 } 436 437 /* 438 * Compute minimal free write space needed to queue new packets. 439 */ 440 static inline int sk_stream_min_wspace(struct sock *sk) 441 { 442 return sk->sk_wmem_queued / 2; 443 } 444 445 static inline int sk_stream_wspace(struct sock *sk) 446 { 447 return sk->sk_sndbuf - sk->sk_wmem_queued; 448 } 449 450 extern void sk_stream_write_space(struct sock *sk); 451 452 static inline int sk_stream_memory_free(struct sock *sk) 453 { 454 return sk->sk_wmem_queued < sk->sk_sndbuf; 455 } 456 457 extern void sk_stream_rfree(struct sk_buff *skb); 458 459 static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk) 460 { 461 skb->sk = sk; 462 skb->destructor = sk_stream_rfree; 463 atomic_add(skb->truesize, &sk->sk_rmem_alloc); 464 sk->sk_forward_alloc -= skb->truesize; 465 } 466 467 static inline void sk_stream_free_skb(struct sock *sk, struct sk_buff *skb) 468 { 469 skb_truesize_check(skb); 470 sock_set_flag(sk, SOCK_QUEUE_SHRUNK); 471 sk->sk_wmem_queued -= skb->truesize; 472 sk->sk_forward_alloc += skb->truesize; 473 __kfree_skb(skb); 474 } 475 476 /* The per-socket spinlock must be held here. */ 477 static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) 478 { 479 if (!sk->sk_backlog.tail) { 480 sk->sk_backlog.head = sk->sk_backlog.tail = skb; 481 } else { 482 sk->sk_backlog.tail->next = skb; 483 sk->sk_backlog.tail = skb; 484 } 485 skb->next = NULL; 486 } 487 488 #define sk_wait_event(__sk, __timeo, __condition) \ 489 ({ int __rc; \ 490 release_sock(__sk); \ 491 __rc = __condition; \ 492 if (!__rc) { \ 493 *(__timeo) = schedule_timeout(*(__timeo)); \ 494 } \ 495 lock_sock(__sk); \ 496 __rc = __condition; \ 497 __rc; \ 498 }) 499 500 extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); 501 extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); 502 extern void sk_stream_wait_close(struct sock *sk, long timeo_p); 503 extern int sk_stream_error(struct sock *sk, int flags, int err); 504 extern void sk_stream_kill_queues(struct sock *sk); 505 506 extern int sk_wait_data(struct sock *sk, long *timeo); 507 508 struct request_sock_ops; 509 struct timewait_sock_ops; 510 511 /* Networking protocol blocks we attach to sockets. 512 * socket layer -> transport layer interface 513 * transport -> network interface is defined by struct inet_proto 514 */ 515 struct proto { 516 void (*close)(struct sock *sk, 517 long timeout); 518 int (*connect)(struct sock *sk, 519 struct sockaddr *uaddr, 520 int addr_len); 521 int (*disconnect)(struct sock *sk, int flags); 522 523 struct sock * (*accept) (struct sock *sk, int flags, int *err); 524 525 int (*ioctl)(struct sock *sk, int cmd, 526 unsigned long arg); 527 int (*init)(struct sock *sk); 528 int (*destroy)(struct sock *sk); 529 void (*shutdown)(struct sock *sk, int how); 530 int (*setsockopt)(struct sock *sk, int level, 531 int optname, char __user *optval, 532 int optlen); 533 int (*getsockopt)(struct sock *sk, int level, 534 int optname, char __user *optval, 535 int __user *option); 536 int (*compat_setsockopt)(struct sock *sk, 537 int level, 538 int optname, char __user *optval, 539 int optlen); 540 int (*compat_getsockopt)(struct sock *sk, 541 int level, 542 int optname, char __user *optval, 543 int __user *option); 544 int (*sendmsg)(struct kiocb *iocb, struct sock *sk, 545 struct msghdr *msg, size_t len); 546 int (*recvmsg)(struct kiocb *iocb, struct sock *sk, 547 struct msghdr *msg, 548 size_t len, int noblock, int flags, 549 int *addr_len); 550 int (*sendpage)(struct sock *sk, struct page *page, 551 int offset, size_t size, int flags); 552 int (*bind)(struct sock *sk, 553 struct sockaddr *uaddr, int addr_len); 554 555 int (*backlog_rcv) (struct sock *sk, 556 struct sk_buff *skb); 557 558 /* Keeping track of sk's, looking them up, and port selection methods. */ 559 void (*hash)(struct sock *sk); 560 void (*unhash)(struct sock *sk); 561 int (*get_port)(struct sock *sk, unsigned short snum); 562 563 /* Memory pressure */ 564 void (*enter_memory_pressure)(void); 565 atomic_t *memory_allocated; /* Current allocated memory. */ 566 atomic_t *sockets_allocated; /* Current number of sockets. */ 567 /* 568 * Pressure flag: try to collapse. 569 * Technical note: it is used by multiple contexts non atomically. 570 * All the sk_stream_mem_schedule() is of this nature: accounting 571 * is strict, actions are advisory and have some latency. 572 */ 573 int *memory_pressure; 574 int *sysctl_mem; 575 int *sysctl_wmem; 576 int *sysctl_rmem; 577 int max_header; 578 579 struct kmem_cache *slab; 580 unsigned int obj_size; 581 582 atomic_t *orphan_count; 583 584 struct request_sock_ops *rsk_prot; 585 struct timewait_sock_ops *twsk_prot; 586 587 struct module *owner; 588 589 char name[32]; 590 591 struct list_head node; 592 #ifdef SOCK_REFCNT_DEBUG 593 atomic_t socks; 594 #endif 595 struct { 596 int inuse; 597 u8 __pad[SMP_CACHE_BYTES - sizeof(int)]; 598 } stats[NR_CPUS]; 599 }; 600 601 extern int proto_register(struct proto *prot, int alloc_slab); 602 extern void proto_unregister(struct proto *prot); 603 604 #ifdef SOCK_REFCNT_DEBUG 605 static inline void sk_refcnt_debug_inc(struct sock *sk) 606 { 607 atomic_inc(&sk->sk_prot->socks); 608 } 609 610 static inline void sk_refcnt_debug_dec(struct sock *sk) 611 { 612 atomic_dec(&sk->sk_prot->socks); 613 printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", 614 sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); 615 } 616 617 static inline void sk_refcnt_debug_release(const struct sock *sk) 618 { 619 if (atomic_read(&sk->sk_refcnt) != 1) 620 printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", 621 sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); 622 } 623 #else /* SOCK_REFCNT_DEBUG */ 624 #define sk_refcnt_debug_inc(sk) do { } while (0) 625 #define sk_refcnt_debug_dec(sk) do { } while (0) 626 #define sk_refcnt_debug_release(sk) do { } while (0) 627 #endif /* SOCK_REFCNT_DEBUG */ 628 629 /* Called with local bh disabled */ 630 static __inline__ void sock_prot_inc_use(struct proto *prot) 631 { 632 prot->stats[smp_processor_id()].inuse++; 633 } 634 635 static __inline__ void sock_prot_dec_use(struct proto *prot) 636 { 637 prot->stats[smp_processor_id()].inuse--; 638 } 639 640 /* With per-bucket locks this operation is not-atomic, so that 641 * this version is not worse. 642 */ 643 static inline void __sk_prot_rehash(struct sock *sk) 644 { 645 sk->sk_prot->unhash(sk); 646 sk->sk_prot->hash(sk); 647 } 648 649 /* About 10 seconds */ 650 #define SOCK_DESTROY_TIME (10*HZ) 651 652 /* Sockets 0-1023 can't be bound to unless you are superuser */ 653 #define PROT_SOCK 1024 654 655 #define SHUTDOWN_MASK 3 656 #define RCV_SHUTDOWN 1 657 #define SEND_SHUTDOWN 2 658 659 #define SOCK_SNDBUF_LOCK 1 660 #define SOCK_RCVBUF_LOCK 2 661 #define SOCK_BINDADDR_LOCK 4 662 #define SOCK_BINDPORT_LOCK 8 663 664 /* sock_iocb: used to kick off async processing of socket ios */ 665 struct sock_iocb { 666 struct list_head list; 667 668 int flags; 669 int size; 670 struct socket *sock; 671 struct sock *sk; 672 struct scm_cookie *scm; 673 struct msghdr *msg, async_msg; 674 struct kiocb *kiocb; 675 }; 676 677 static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) 678 { 679 return (struct sock_iocb *)iocb->private; 680 } 681 682 static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) 683 { 684 return si->kiocb; 685 } 686 687 struct socket_alloc { 688 struct socket socket; 689 struct inode vfs_inode; 690 }; 691 692 static inline struct socket *SOCKET_I(struct inode *inode) 693 { 694 return &container_of(inode, struct socket_alloc, vfs_inode)->socket; 695 } 696 697 static inline struct inode *SOCK_INODE(struct socket *socket) 698 { 699 return &container_of(socket, struct socket_alloc, socket)->vfs_inode; 700 } 701 702 extern void __sk_stream_mem_reclaim(struct sock *sk); 703 extern int sk_stream_mem_schedule(struct sock *sk, int size, int kind); 704 705 #define SK_STREAM_MEM_QUANTUM ((int)PAGE_SIZE) 706 707 static inline int sk_stream_pages(int amt) 708 { 709 return DIV_ROUND_UP(amt, SK_STREAM_MEM_QUANTUM); 710 } 711 712 static inline void sk_stream_mem_reclaim(struct sock *sk) 713 { 714 if (sk->sk_forward_alloc >= SK_STREAM_MEM_QUANTUM) 715 __sk_stream_mem_reclaim(sk); 716 } 717 718 static inline int sk_stream_rmem_schedule(struct sock *sk, struct sk_buff *skb) 719 { 720 return (int)skb->truesize <= sk->sk_forward_alloc || 721 sk_stream_mem_schedule(sk, skb->truesize, 1); 722 } 723 724 static inline int sk_stream_wmem_schedule(struct sock *sk, int size) 725 { 726 return size <= sk->sk_forward_alloc || 727 sk_stream_mem_schedule(sk, size, 0); 728 } 729 730 /* Used by processes to "lock" a socket state, so that 731 * interrupts and bottom half handlers won't change it 732 * from under us. It essentially blocks any incoming 733 * packets, so that we won't get any new data or any 734 * packets that change the state of the socket. 735 * 736 * While locked, BH processing will add new packets to 737 * the backlog queue. This queue is processed by the 738 * owner of the socket lock right before it is released. 739 * 740 * Since ~2.3.5 it is also exclusive sleep lock serializing 741 * accesses from user process context. 742 */ 743 #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) 744 745 /* 746 * Macro so as to not evaluate some arguments when 747 * lockdep is not enabled. 748 * 749 * Mark both the sk_lock and the sk_lock.slock as a 750 * per-address-family lock class. 751 */ 752 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ 753 do { \ 754 sk->sk_lock.owned = 0; \ 755 init_waitqueue_head(&sk->sk_lock.wq); \ 756 spin_lock_init(&(sk)->sk_lock.slock); \ 757 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ 758 sizeof((sk)->sk_lock)); \ 759 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ 760 (skey), (sname)); \ 761 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ 762 } while (0) 763 764 extern void FASTCALL(lock_sock_nested(struct sock *sk, int subclass)); 765 766 static inline void lock_sock(struct sock *sk) 767 { 768 lock_sock_nested(sk, 0); 769 } 770 771 extern void FASTCALL(release_sock(struct sock *sk)); 772 773 /* BH context may only use the following locking interface. */ 774 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) 775 #define bh_lock_sock_nested(__sk) \ 776 spin_lock_nested(&((__sk)->sk_lock.slock), \ 777 SINGLE_DEPTH_NESTING) 778 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) 779 780 extern struct sock *sk_alloc(struct net *net, int family, 781 gfp_t priority, 782 struct proto *prot, int zero_it); 783 extern void sk_free(struct sock *sk); 784 extern struct sock *sk_clone(const struct sock *sk, 785 const gfp_t priority); 786 787 extern struct sk_buff *sock_wmalloc(struct sock *sk, 788 unsigned long size, int force, 789 gfp_t priority); 790 extern struct sk_buff *sock_rmalloc(struct sock *sk, 791 unsigned long size, int force, 792 gfp_t priority); 793 extern void sock_wfree(struct sk_buff *skb); 794 extern void sock_rfree(struct sk_buff *skb); 795 796 extern int sock_setsockopt(struct socket *sock, int level, 797 int op, char __user *optval, 798 int optlen); 799 800 extern int sock_getsockopt(struct socket *sock, int level, 801 int op, char __user *optval, 802 int __user *optlen); 803 extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, 804 unsigned long size, 805 int noblock, 806 int *errcode); 807 extern void *sock_kmalloc(struct sock *sk, int size, 808 gfp_t priority); 809 extern void sock_kfree_s(struct sock *sk, void *mem, int size); 810 extern void sk_send_sigurg(struct sock *sk); 811 812 /* 813 * Functions to fill in entries in struct proto_ops when a protocol 814 * does not implement a particular function. 815 */ 816 extern int sock_no_bind(struct socket *, 817 struct sockaddr *, int); 818 extern int sock_no_connect(struct socket *, 819 struct sockaddr *, int, int); 820 extern int sock_no_socketpair(struct socket *, 821 struct socket *); 822 extern int sock_no_accept(struct socket *, 823 struct socket *, int); 824 extern int sock_no_getname(struct socket *, 825 struct sockaddr *, int *, int); 826 extern unsigned int sock_no_poll(struct file *, struct socket *, 827 struct poll_table_struct *); 828 extern int sock_no_ioctl(struct socket *, unsigned int, 829 unsigned long); 830 extern int sock_no_listen(struct socket *, int); 831 extern int sock_no_shutdown(struct socket *, int); 832 extern int sock_no_getsockopt(struct socket *, int , int, 833 char __user *, int __user *); 834 extern int sock_no_setsockopt(struct socket *, int, int, 835 char __user *, int); 836 extern int sock_no_sendmsg(struct kiocb *, struct socket *, 837 struct msghdr *, size_t); 838 extern int sock_no_recvmsg(struct kiocb *, struct socket *, 839 struct msghdr *, size_t, int); 840 extern int sock_no_mmap(struct file *file, 841 struct socket *sock, 842 struct vm_area_struct *vma); 843 extern ssize_t sock_no_sendpage(struct socket *sock, 844 struct page *page, 845 int offset, size_t size, 846 int flags); 847 848 /* 849 * Functions to fill in entries in struct proto_ops when a protocol 850 * uses the inet style. 851 */ 852 extern int sock_common_getsockopt(struct socket *sock, int level, int optname, 853 char __user *optval, int __user *optlen); 854 extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 855 struct msghdr *msg, size_t size, int flags); 856 extern int sock_common_setsockopt(struct socket *sock, int level, int optname, 857 char __user *optval, int optlen); 858 extern int compat_sock_common_getsockopt(struct socket *sock, int level, 859 int optname, char __user *optval, int __user *optlen); 860 extern int compat_sock_common_setsockopt(struct socket *sock, int level, 861 int optname, char __user *optval, int optlen); 862 863 extern void sk_common_release(struct sock *sk); 864 865 /* 866 * Default socket callbacks and setup code 867 */ 868 869 /* Initialise core socket variables */ 870 extern void sock_init_data(struct socket *sock, struct sock *sk); 871 872 /** 873 * sk_filter - run a packet through a socket filter 874 * @sk: sock associated with &sk_buff 875 * @skb: buffer to filter 876 * @needlock: set to 1 if the sock is not locked by caller. 877 * 878 * Run the filter code and then cut skb->data to correct size returned by 879 * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller 880 * than pkt_len we keep whole skb->data. This is the socket level 881 * wrapper to sk_run_filter. It returns 0 if the packet should 882 * be accepted or -EPERM if the packet should be tossed. 883 * 884 */ 885 886 static inline int sk_filter(struct sock *sk, struct sk_buff *skb) 887 { 888 int err; 889 struct sk_filter *filter; 890 891 err = security_sock_rcv_skb(sk, skb); 892 if (err) 893 return err; 894 895 rcu_read_lock_bh(); 896 filter = sk->sk_filter; 897 if (filter) { 898 unsigned int pkt_len = sk_run_filter(skb, filter->insns, 899 filter->len); 900 err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM; 901 } 902 rcu_read_unlock_bh(); 903 904 return err; 905 } 906 907 /** 908 * sk_filter_rcu_free: Free a socket filter 909 * @rcu: rcu_head that contains the sk_filter to free 910 */ 911 static inline void sk_filter_rcu_free(struct rcu_head *rcu) 912 { 913 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 914 kfree(fp); 915 } 916 917 /** 918 * sk_filter_release: Release a socket filter 919 * @sk: socket 920 * @fp: filter to remove 921 * 922 * Remove a filter from a socket and release its resources. 923 */ 924 925 static inline void sk_filter_release(struct sock *sk, struct sk_filter *fp) 926 { 927 unsigned int size = sk_filter_len(fp); 928 929 atomic_sub(size, &sk->sk_omem_alloc); 930 931 if (atomic_dec_and_test(&fp->refcnt)) 932 call_rcu_bh(&fp->rcu, sk_filter_rcu_free); 933 } 934 935 static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) 936 { 937 atomic_inc(&fp->refcnt); 938 atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); 939 } 940 941 /* 942 * Socket reference counting postulates. 943 * 944 * * Each user of socket SHOULD hold a reference count. 945 * * Each access point to socket (an hash table bucket, reference from a list, 946 * running timer, skb in flight MUST hold a reference count. 947 * * When reference count hits 0, it means it will never increase back. 948 * * When reference count hits 0, it means that no references from 949 * outside exist to this socket and current process on current CPU 950 * is last user and may/should destroy this socket. 951 * * sk_free is called from any context: process, BH, IRQ. When 952 * it is called, socket has no references from outside -> sk_free 953 * may release descendant resources allocated by the socket, but 954 * to the time when it is called, socket is NOT referenced by any 955 * hash tables, lists etc. 956 * * Packets, delivered from outside (from network or from another process) 957 * and enqueued on receive/error queues SHOULD NOT grab reference count, 958 * when they sit in queue. Otherwise, packets will leak to hole, when 959 * socket is looked up by one cpu and unhasing is made by another CPU. 960 * It is true for udp/raw, netlink (leak to receive and error queues), tcp 961 * (leak to backlog). Packet socket does all the processing inside 962 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets 963 * use separate SMP lock, so that they are prone too. 964 */ 965 966 /* Ungrab socket and destroy it, if it was the last reference. */ 967 static inline void sock_put(struct sock *sk) 968 { 969 if (atomic_dec_and_test(&sk->sk_refcnt)) 970 sk_free(sk); 971 } 972 973 extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, 974 const int nested); 975 976 /* Detach socket from process context. 977 * Announce socket dead, detach it from wait queue and inode. 978 * Note that parent inode held reference count on this struct sock, 979 * we do not release it in this function, because protocol 980 * probably wants some additional cleanups or even continuing 981 * to work with this socket (TCP). 982 */ 983 static inline void sock_orphan(struct sock *sk) 984 { 985 write_lock_bh(&sk->sk_callback_lock); 986 sock_set_flag(sk, SOCK_DEAD); 987 sk->sk_socket = NULL; 988 sk->sk_sleep = NULL; 989 write_unlock_bh(&sk->sk_callback_lock); 990 } 991 992 static inline void sock_graft(struct sock *sk, struct socket *parent) 993 { 994 write_lock_bh(&sk->sk_callback_lock); 995 sk->sk_sleep = &parent->wait; 996 parent->sk = sk; 997 sk->sk_socket = parent; 998 security_sock_graft(sk, parent); 999 write_unlock_bh(&sk->sk_callback_lock); 1000 } 1001 1002 static inline void sock_copy(struct sock *nsk, const struct sock *osk) 1003 { 1004 #ifdef CONFIG_SECURITY_NETWORK 1005 void *sptr = nsk->sk_security; 1006 #endif 1007 1008 memcpy(nsk, osk, osk->sk_prot->obj_size); 1009 get_net(nsk->sk_net); 1010 #ifdef CONFIG_SECURITY_NETWORK 1011 nsk->sk_security = sptr; 1012 security_sk_clone(osk, nsk); 1013 #endif 1014 } 1015 1016 extern int sock_i_uid(struct sock *sk); 1017 extern unsigned long sock_i_ino(struct sock *sk); 1018 1019 static inline struct dst_entry * 1020 __sk_dst_get(struct sock *sk) 1021 { 1022 return sk->sk_dst_cache; 1023 } 1024 1025 static inline struct dst_entry * 1026 sk_dst_get(struct sock *sk) 1027 { 1028 struct dst_entry *dst; 1029 1030 read_lock(&sk->sk_dst_lock); 1031 dst = sk->sk_dst_cache; 1032 if (dst) 1033 dst_hold(dst); 1034 read_unlock(&sk->sk_dst_lock); 1035 return dst; 1036 } 1037 1038 static inline void 1039 __sk_dst_set(struct sock *sk, struct dst_entry *dst) 1040 { 1041 struct dst_entry *old_dst; 1042 1043 old_dst = sk->sk_dst_cache; 1044 sk->sk_dst_cache = dst; 1045 dst_release(old_dst); 1046 } 1047 1048 static inline void 1049 sk_dst_set(struct sock *sk, struct dst_entry *dst) 1050 { 1051 write_lock(&sk->sk_dst_lock); 1052 __sk_dst_set(sk, dst); 1053 write_unlock(&sk->sk_dst_lock); 1054 } 1055 1056 static inline void 1057 __sk_dst_reset(struct sock *sk) 1058 { 1059 struct dst_entry *old_dst; 1060 1061 old_dst = sk->sk_dst_cache; 1062 sk->sk_dst_cache = NULL; 1063 dst_release(old_dst); 1064 } 1065 1066 static inline void 1067 sk_dst_reset(struct sock *sk) 1068 { 1069 write_lock(&sk->sk_dst_lock); 1070 __sk_dst_reset(sk); 1071 write_unlock(&sk->sk_dst_lock); 1072 } 1073 1074 extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); 1075 1076 extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); 1077 1078 static inline int sk_can_gso(const struct sock *sk) 1079 { 1080 return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); 1081 } 1082 1083 extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); 1084 1085 static inline void sk_charge_skb(struct sock *sk, struct sk_buff *skb) 1086 { 1087 sk->sk_wmem_queued += skb->truesize; 1088 sk->sk_forward_alloc -= skb->truesize; 1089 } 1090 1091 static inline int skb_copy_to_page(struct sock *sk, char __user *from, 1092 struct sk_buff *skb, struct page *page, 1093 int off, int copy) 1094 { 1095 if (skb->ip_summed == CHECKSUM_NONE) { 1096 int err = 0; 1097 __wsum csum = csum_and_copy_from_user(from, 1098 page_address(page) + off, 1099 copy, 0, &err); 1100 if (err) 1101 return err; 1102 skb->csum = csum_block_add(skb->csum, csum, skb->len); 1103 } else if (copy_from_user(page_address(page) + off, from, copy)) 1104 return -EFAULT; 1105 1106 skb->len += copy; 1107 skb->data_len += copy; 1108 skb->truesize += copy; 1109 sk->sk_wmem_queued += copy; 1110 sk->sk_forward_alloc -= copy; 1111 return 0; 1112 } 1113 1114 /* 1115 * Queue a received datagram if it will fit. Stream and sequenced 1116 * protocols can't normally use this as they need to fit buffers in 1117 * and play with them. 1118 * 1119 * Inlined as it's very short and called for pretty much every 1120 * packet ever received. 1121 */ 1122 1123 static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) 1124 { 1125 sock_hold(sk); 1126 skb->sk = sk; 1127 skb->destructor = sock_wfree; 1128 atomic_add(skb->truesize, &sk->sk_wmem_alloc); 1129 } 1130 1131 static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 1132 { 1133 skb->sk = sk; 1134 skb->destructor = sock_rfree; 1135 atomic_add(skb->truesize, &sk->sk_rmem_alloc); 1136 } 1137 1138 extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1139 unsigned long expires); 1140 1141 extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); 1142 1143 extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 1144 1145 static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) 1146 { 1147 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 1148 number of warnings when compiling with -W --ANK 1149 */ 1150 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 1151 (unsigned)sk->sk_rcvbuf) 1152 return -ENOMEM; 1153 skb_set_owner_r(skb, sk); 1154 skb_queue_tail(&sk->sk_error_queue, skb); 1155 if (!sock_flag(sk, SOCK_DEAD)) 1156 sk->sk_data_ready(sk, skb->len); 1157 return 0; 1158 } 1159 1160 /* 1161 * Recover an error report and clear atomically 1162 */ 1163 1164 static inline int sock_error(struct sock *sk) 1165 { 1166 int err; 1167 if (likely(!sk->sk_err)) 1168 return 0; 1169 err = xchg(&sk->sk_err, 0); 1170 return -err; 1171 } 1172 1173 static inline unsigned long sock_wspace(struct sock *sk) 1174 { 1175 int amt = 0; 1176 1177 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1178 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1179 if (amt < 0) 1180 amt = 0; 1181 } 1182 return amt; 1183 } 1184 1185 static inline void sk_wake_async(struct sock *sk, int how, int band) 1186 { 1187 if (sk->sk_socket && sk->sk_socket->fasync_list) 1188 sock_wake_async(sk->sk_socket, how, band); 1189 } 1190 1191 #define SOCK_MIN_SNDBUF 2048 1192 #define SOCK_MIN_RCVBUF 256 1193 1194 static inline void sk_stream_moderate_sndbuf(struct sock *sk) 1195 { 1196 if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { 1197 sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued / 2); 1198 sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); 1199 } 1200 } 1201 1202 static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk, 1203 int size, int mem, 1204 gfp_t gfp) 1205 { 1206 struct sk_buff *skb; 1207 int hdr_len; 1208 1209 hdr_len = SKB_DATA_ALIGN(sk->sk_prot->max_header); 1210 skb = alloc_skb_fclone(size + hdr_len, gfp); 1211 if (skb) { 1212 skb->truesize += mem; 1213 if (sk_stream_wmem_schedule(sk, skb->truesize)) { 1214 skb_reserve(skb, hdr_len); 1215 return skb; 1216 } 1217 __kfree_skb(skb); 1218 } else { 1219 sk->sk_prot->enter_memory_pressure(); 1220 sk_stream_moderate_sndbuf(sk); 1221 } 1222 return NULL; 1223 } 1224 1225 static inline struct sk_buff *sk_stream_alloc_skb(struct sock *sk, 1226 int size, 1227 gfp_t gfp) 1228 { 1229 return sk_stream_alloc_pskb(sk, size, 0, gfp); 1230 } 1231 1232 static inline struct page *sk_stream_alloc_page(struct sock *sk) 1233 { 1234 struct page *page = NULL; 1235 1236 page = alloc_pages(sk->sk_allocation, 0); 1237 if (!page) { 1238 sk->sk_prot->enter_memory_pressure(); 1239 sk_stream_moderate_sndbuf(sk); 1240 } 1241 return page; 1242 } 1243 1244 /* 1245 * Default write policy as shown to user space via poll/select/SIGIO 1246 */ 1247 static inline int sock_writeable(const struct sock *sk) 1248 { 1249 return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf / 2); 1250 } 1251 1252 static inline gfp_t gfp_any(void) 1253 { 1254 return in_atomic() ? GFP_ATOMIC : GFP_KERNEL; 1255 } 1256 1257 static inline long sock_rcvtimeo(const struct sock *sk, int noblock) 1258 { 1259 return noblock ? 0 : sk->sk_rcvtimeo; 1260 } 1261 1262 static inline long sock_sndtimeo(const struct sock *sk, int noblock) 1263 { 1264 return noblock ? 0 : sk->sk_sndtimeo; 1265 } 1266 1267 static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) 1268 { 1269 return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; 1270 } 1271 1272 /* Alas, with timeout socket operations are not restartable. 1273 * Compare this to poll(). 1274 */ 1275 static inline int sock_intr_errno(long timeo) 1276 { 1277 return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; 1278 } 1279 1280 extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 1281 struct sk_buff *skb); 1282 1283 static __inline__ void 1284 sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) 1285 { 1286 ktime_t kt = skb->tstamp; 1287 1288 if (sock_flag(sk, SOCK_RCVTSTAMP)) 1289 __sock_recv_timestamp(msg, sk, skb); 1290 else 1291 sk->sk_stamp = kt; 1292 } 1293 1294 /** 1295 * sk_eat_skb - Release a skb if it is no longer needed 1296 * @sk: socket to eat this skb from 1297 * @skb: socket buffer to eat 1298 * @copied_early: flag indicating whether DMA operations copied this data early 1299 * 1300 * This routine must be called with interrupts disabled or with the socket 1301 * locked so that the sk_buff queue operation is ok. 1302 */ 1303 #ifdef CONFIG_NET_DMA 1304 static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) 1305 { 1306 __skb_unlink(skb, &sk->sk_receive_queue); 1307 if (!copied_early) 1308 __kfree_skb(skb); 1309 else 1310 __skb_queue_tail(&sk->sk_async_wait_queue, skb); 1311 } 1312 #else 1313 static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) 1314 { 1315 __skb_unlink(skb, &sk->sk_receive_queue); 1316 __kfree_skb(skb); 1317 } 1318 #endif 1319 1320 extern void sock_enable_timestamp(struct sock *sk); 1321 extern int sock_get_timestamp(struct sock *, struct timeval __user *); 1322 extern int sock_get_timestampns(struct sock *, struct timespec __user *); 1323 1324 /* 1325 * Enable debug/info messages 1326 */ 1327 extern int net_msg_warn; 1328 #define NETDEBUG(fmt, args...) \ 1329 do { if (net_msg_warn) printk(fmt,##args); } while (0) 1330 1331 #define LIMIT_NETDEBUG(fmt, args...) \ 1332 do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) 1333 1334 /* 1335 * Macros for sleeping on a socket. Use them like this: 1336 * 1337 * SOCK_SLEEP_PRE(sk) 1338 * if (condition) 1339 * schedule(); 1340 * SOCK_SLEEP_POST(sk) 1341 * 1342 * N.B. These are now obsolete and were, afaik, only ever used in DECnet 1343 * and when the last use of them in DECnet has gone, I'm intending to 1344 * remove them. 1345 */ 1346 1347 #define SOCK_SLEEP_PRE(sk) { struct task_struct *tsk = current; \ 1348 DECLARE_WAITQUEUE(wait, tsk); \ 1349 tsk->state = TASK_INTERRUPTIBLE; \ 1350 add_wait_queue((sk)->sk_sleep, &wait); \ 1351 release_sock(sk); 1352 1353 #define SOCK_SLEEP_POST(sk) tsk->state = TASK_RUNNING; \ 1354 remove_wait_queue((sk)->sk_sleep, &wait); \ 1355 lock_sock(sk); \ 1356 } 1357 1358 static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 1359 { 1360 if (valbool) 1361 sock_set_flag(sk, bit); 1362 else 1363 sock_reset_flag(sk, bit); 1364 } 1365 1366 extern __u32 sysctl_wmem_max; 1367 extern __u32 sysctl_rmem_max; 1368 1369 extern void sk_init(void); 1370 1371 #ifdef CONFIG_SYSCTL 1372 extern struct ctl_table core_table[]; 1373 #endif 1374 1375 extern int sysctl_optmem_max; 1376 1377 extern __u32 sysctl_wmem_default; 1378 extern __u32 sysctl_rmem_default; 1379 1380 #endif /* _SOCK_H */ 1381