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/pcounter.h> 51 #include <linux/skbuff.h> /* struct sk_buff */ 52 #include <linux/mm.h> 53 #include <linux/security.h> 54 55 #include <linux/filter.h> 56 57 #include <asm/atomic.h> 58 #include <net/dst.h> 59 #include <net/checksum.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 struct net; 98 99 /** 100 * struct sock_common - minimal network layer representation of sockets 101 * @skc_family: network address family 102 * @skc_state: Connection state 103 * @skc_reuse: %SO_REUSEADDR setting 104 * @skc_bound_dev_if: bound device index if != 0 105 * @skc_node: main hash linkage for various protocol lookup tables 106 * @skc_bind_node: bind hash linkage for various protocol lookup tables 107 * @skc_refcnt: reference count 108 * @skc_hash: hash value used with various protocol lookup tables 109 * @skc_prot: protocol handlers inside a network family 110 * @skc_net: reference to the network namespace of this socket 111 * 112 * This is the minimal network layer representation of sockets, the header 113 * for struct sock and struct inet_timewait_sock. 114 */ 115 struct sock_common { 116 unsigned short skc_family; 117 volatile unsigned char skc_state; 118 unsigned char skc_reuse; 119 int skc_bound_dev_if; 120 struct hlist_node skc_node; 121 struct hlist_node skc_bind_node; 122 atomic_t skc_refcnt; 123 unsigned int skc_hash; 124 struct proto *skc_prot; 125 struct net *skc_net; 126 }; 127 128 /** 129 * struct sock - network layer representation of sockets 130 * @__sk_common: shared layout with inet_timewait_sock 131 * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN 132 * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings 133 * @sk_lock: synchronizer 134 * @sk_rcvbuf: size of receive buffer in bytes 135 * @sk_sleep: sock wait queue 136 * @sk_dst_cache: destination cache 137 * @sk_dst_lock: destination cache lock 138 * @sk_policy: flow policy 139 * @sk_rmem_alloc: receive queue bytes committed 140 * @sk_receive_queue: incoming packets 141 * @sk_wmem_alloc: transmit queue bytes committed 142 * @sk_write_queue: Packet sending queue 143 * @sk_async_wait_queue: DMA copied packets 144 * @sk_omem_alloc: "o" is "option" or "other" 145 * @sk_wmem_queued: persistent queue size 146 * @sk_forward_alloc: space allocated forward 147 * @sk_allocation: allocation mode 148 * @sk_sndbuf: size of send buffer in bytes 149 * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, 150 * %SO_OOBINLINE settings 151 * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets 152 * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) 153 * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) 154 * @sk_lingertime: %SO_LINGER l_linger setting 155 * @sk_backlog: always used with the per-socket spinlock held 156 * @sk_callback_lock: used with the callbacks in the end of this struct 157 * @sk_error_queue: rarely used 158 * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, 159 * IPV6_ADDRFORM for instance) 160 * @sk_err: last error 161 * @sk_err_soft: errors that don't cause failure but are the cause of a 162 * persistent failure not just 'timed out' 163 * @sk_drops: raw drops counter 164 * @sk_ack_backlog: current listen backlog 165 * @sk_max_ack_backlog: listen backlog set in listen() 166 * @sk_priority: %SO_PRIORITY setting 167 * @sk_type: socket type (%SOCK_STREAM, etc) 168 * @sk_protocol: which protocol this socket belongs in this network family 169 * @sk_peercred: %SO_PEERCRED setting 170 * @sk_rcvlowat: %SO_RCVLOWAT setting 171 * @sk_rcvtimeo: %SO_RCVTIMEO setting 172 * @sk_sndtimeo: %SO_SNDTIMEO setting 173 * @sk_filter: socket filtering instructions 174 * @sk_protinfo: private area, net family specific, when not using slab 175 * @sk_timer: sock cleanup timer 176 * @sk_stamp: time stamp of last packet received 177 * @sk_socket: Identd and reporting IO signals 178 * @sk_user_data: RPC layer private data 179 * @sk_sndmsg_page: cached page for sendmsg 180 * @sk_sndmsg_off: cached offset for sendmsg 181 * @sk_send_head: front of stuff to transmit 182 * @sk_security: used by security modules 183 * @sk_mark: generic packet mark 184 * @sk_write_pending: a write to stream socket waits to start 185 * @sk_state_change: callback to indicate change in the state of the sock 186 * @sk_data_ready: callback to indicate there is data to be processed 187 * @sk_write_space: callback to indicate there is bf sending space available 188 * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) 189 * @sk_backlog_rcv: callback to process the backlog 190 * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 191 */ 192 struct sock { 193 /* 194 * Now struct inet_timewait_sock also uses sock_common, so please just 195 * don't add nothing before this first member (__sk_common) --acme 196 */ 197 struct sock_common __sk_common; 198 #define sk_family __sk_common.skc_family 199 #define sk_state __sk_common.skc_state 200 #define sk_reuse __sk_common.skc_reuse 201 #define sk_bound_dev_if __sk_common.skc_bound_dev_if 202 #define sk_node __sk_common.skc_node 203 #define sk_bind_node __sk_common.skc_bind_node 204 #define sk_refcnt __sk_common.skc_refcnt 205 #define sk_hash __sk_common.skc_hash 206 #define sk_prot __sk_common.skc_prot 207 #define sk_net __sk_common.skc_net 208 unsigned char sk_shutdown : 2, 209 sk_no_check : 2, 210 sk_userlocks : 4; 211 unsigned char sk_protocol; 212 unsigned short sk_type; 213 int sk_rcvbuf; 214 socket_lock_t sk_lock; 215 /* 216 * The backlog queue is special, it is always used with 217 * the per-socket spinlock held and requires low latency 218 * access. Therefore we special case it's implementation. 219 */ 220 struct { 221 struct sk_buff *head; 222 struct sk_buff *tail; 223 } sk_backlog; 224 wait_queue_head_t *sk_sleep; 225 struct dst_entry *sk_dst_cache; 226 struct xfrm_policy *sk_policy[2]; 227 rwlock_t sk_dst_lock; 228 atomic_t sk_rmem_alloc; 229 atomic_t sk_wmem_alloc; 230 atomic_t sk_omem_alloc; 231 int sk_sndbuf; 232 struct sk_buff_head sk_receive_queue; 233 struct sk_buff_head sk_write_queue; 234 struct sk_buff_head sk_async_wait_queue; 235 int sk_wmem_queued; 236 int sk_forward_alloc; 237 gfp_t sk_allocation; 238 int sk_route_caps; 239 int sk_gso_type; 240 int sk_rcvlowat; 241 unsigned long sk_flags; 242 unsigned long sk_lingertime; 243 struct sk_buff_head sk_error_queue; 244 struct proto *sk_prot_creator; 245 rwlock_t sk_callback_lock; 246 int sk_err, 247 sk_err_soft; 248 atomic_t sk_drops; 249 unsigned short sk_ack_backlog; 250 unsigned short sk_max_ack_backlog; 251 __u32 sk_priority; 252 struct ucred sk_peercred; 253 long sk_rcvtimeo; 254 long sk_sndtimeo; 255 struct sk_filter *sk_filter; 256 void *sk_protinfo; 257 struct timer_list sk_timer; 258 ktime_t sk_stamp; 259 struct socket *sk_socket; 260 void *sk_user_data; 261 struct page *sk_sndmsg_page; 262 struct sk_buff *sk_send_head; 263 __u32 sk_sndmsg_off; 264 int sk_write_pending; 265 void *sk_security; 266 __u32 sk_mark; 267 /* XXX 4 bytes hole on 64 bit */ 268 void (*sk_state_change)(struct sock *sk); 269 void (*sk_data_ready)(struct sock *sk, int bytes); 270 void (*sk_write_space)(struct sock *sk); 271 void (*sk_error_report)(struct sock *sk); 272 int (*sk_backlog_rcv)(struct sock *sk, 273 struct sk_buff *skb); 274 void (*sk_destruct)(struct sock *sk); 275 }; 276 277 /* 278 * Hashed lists helper routines 279 */ 280 static inline struct sock *__sk_head(const struct hlist_head *head) 281 { 282 return hlist_entry(head->first, struct sock, sk_node); 283 } 284 285 static inline struct sock *sk_head(const struct hlist_head *head) 286 { 287 return hlist_empty(head) ? NULL : __sk_head(head); 288 } 289 290 static inline struct sock *sk_next(const struct sock *sk) 291 { 292 return sk->sk_node.next ? 293 hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; 294 } 295 296 static inline int sk_unhashed(const struct sock *sk) 297 { 298 return hlist_unhashed(&sk->sk_node); 299 } 300 301 static inline int sk_hashed(const struct sock *sk) 302 { 303 return !sk_unhashed(sk); 304 } 305 306 static __inline__ void sk_node_init(struct hlist_node *node) 307 { 308 node->pprev = NULL; 309 } 310 311 static __inline__ void __sk_del_node(struct sock *sk) 312 { 313 __hlist_del(&sk->sk_node); 314 } 315 316 static __inline__ int __sk_del_node_init(struct sock *sk) 317 { 318 if (sk_hashed(sk)) { 319 __sk_del_node(sk); 320 sk_node_init(&sk->sk_node); 321 return 1; 322 } 323 return 0; 324 } 325 326 /* Grab socket reference count. This operation is valid only 327 when sk is ALREADY grabbed f.e. it is found in hash table 328 or a list and the lookup is made under lock preventing hash table 329 modifications. 330 */ 331 332 static inline void sock_hold(struct sock *sk) 333 { 334 atomic_inc(&sk->sk_refcnt); 335 } 336 337 /* Ungrab socket in the context, which assumes that socket refcnt 338 cannot hit zero, f.e. it is true in context of any socketcall. 339 */ 340 static inline void __sock_put(struct sock *sk) 341 { 342 atomic_dec(&sk->sk_refcnt); 343 } 344 345 static __inline__ int sk_del_node_init(struct sock *sk) 346 { 347 int rc = __sk_del_node_init(sk); 348 349 if (rc) { 350 /* paranoid for a while -acme */ 351 WARN_ON(atomic_read(&sk->sk_refcnt) == 1); 352 __sock_put(sk); 353 } 354 return rc; 355 } 356 357 static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list) 358 { 359 hlist_add_head(&sk->sk_node, list); 360 } 361 362 static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list) 363 { 364 sock_hold(sk); 365 __sk_add_node(sk, list); 366 } 367 368 static __inline__ void __sk_del_bind_node(struct sock *sk) 369 { 370 __hlist_del(&sk->sk_bind_node); 371 } 372 373 static __inline__ void sk_add_bind_node(struct sock *sk, 374 struct hlist_head *list) 375 { 376 hlist_add_head(&sk->sk_bind_node, list); 377 } 378 379 #define sk_for_each(__sk, node, list) \ 380 hlist_for_each_entry(__sk, node, list, sk_node) 381 #define sk_for_each_from(__sk, node) \ 382 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ 383 hlist_for_each_entry_from(__sk, node, sk_node) 384 #define sk_for_each_continue(__sk, node) \ 385 if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ 386 hlist_for_each_entry_continue(__sk, node, sk_node) 387 #define sk_for_each_safe(__sk, node, tmp, list) \ 388 hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) 389 #define sk_for_each_bound(__sk, node, list) \ 390 hlist_for_each_entry(__sk, node, list, sk_bind_node) 391 392 /* Sock flags */ 393 enum sock_flags { 394 SOCK_DEAD, 395 SOCK_DONE, 396 SOCK_URGINLINE, 397 SOCK_KEEPOPEN, 398 SOCK_LINGER, 399 SOCK_DESTROY, 400 SOCK_BROADCAST, 401 SOCK_TIMESTAMP, 402 SOCK_ZAPPED, 403 SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */ 404 SOCK_DBG, /* %SO_DEBUG setting */ 405 SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */ 406 SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ 407 SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ 408 SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ 409 }; 410 411 static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) 412 { 413 nsk->sk_flags = osk->sk_flags; 414 } 415 416 static inline void sock_set_flag(struct sock *sk, enum sock_flags flag) 417 { 418 __set_bit(flag, &sk->sk_flags); 419 } 420 421 static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag) 422 { 423 __clear_bit(flag, &sk->sk_flags); 424 } 425 426 static inline int sock_flag(struct sock *sk, enum sock_flags flag) 427 { 428 return test_bit(flag, &sk->sk_flags); 429 } 430 431 static inline void sk_acceptq_removed(struct sock *sk) 432 { 433 sk->sk_ack_backlog--; 434 } 435 436 static inline void sk_acceptq_added(struct sock *sk) 437 { 438 sk->sk_ack_backlog++; 439 } 440 441 static inline int sk_acceptq_is_full(struct sock *sk) 442 { 443 return sk->sk_ack_backlog > sk->sk_max_ack_backlog; 444 } 445 446 /* 447 * Compute minimal free write space needed to queue new packets. 448 */ 449 static inline int sk_stream_min_wspace(struct sock *sk) 450 { 451 return sk->sk_wmem_queued >> 1; 452 } 453 454 static inline int sk_stream_wspace(struct sock *sk) 455 { 456 return sk->sk_sndbuf - sk->sk_wmem_queued; 457 } 458 459 extern void sk_stream_write_space(struct sock *sk); 460 461 static inline int sk_stream_memory_free(struct sock *sk) 462 { 463 return sk->sk_wmem_queued < sk->sk_sndbuf; 464 } 465 466 /* The per-socket spinlock must be held here. */ 467 static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) 468 { 469 if (!sk->sk_backlog.tail) { 470 sk->sk_backlog.head = sk->sk_backlog.tail = skb; 471 } else { 472 sk->sk_backlog.tail->next = skb; 473 sk->sk_backlog.tail = skb; 474 } 475 skb->next = NULL; 476 } 477 478 #define sk_wait_event(__sk, __timeo, __condition) \ 479 ({ int __rc; \ 480 release_sock(__sk); \ 481 __rc = __condition; \ 482 if (!__rc) { \ 483 *(__timeo) = schedule_timeout(*(__timeo)); \ 484 } \ 485 lock_sock(__sk); \ 486 __rc = __condition; \ 487 __rc; \ 488 }) 489 490 extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); 491 extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); 492 extern void sk_stream_wait_close(struct sock *sk, long timeo_p); 493 extern int sk_stream_error(struct sock *sk, int flags, int err); 494 extern void sk_stream_kill_queues(struct sock *sk); 495 496 extern int sk_wait_data(struct sock *sk, long *timeo); 497 498 struct request_sock_ops; 499 struct timewait_sock_ops; 500 struct inet_hashinfo; 501 502 /* Networking protocol blocks we attach to sockets. 503 * socket layer -> transport layer interface 504 * transport -> network interface is defined by struct inet_proto 505 */ 506 struct proto { 507 void (*close)(struct sock *sk, 508 long timeout); 509 int (*connect)(struct sock *sk, 510 struct sockaddr *uaddr, 511 int addr_len); 512 int (*disconnect)(struct sock *sk, int flags); 513 514 struct sock * (*accept) (struct sock *sk, int flags, int *err); 515 516 int (*ioctl)(struct sock *sk, int cmd, 517 unsigned long arg); 518 int (*init)(struct sock *sk); 519 int (*destroy)(struct sock *sk); 520 void (*shutdown)(struct sock *sk, int how); 521 int (*setsockopt)(struct sock *sk, int level, 522 int optname, char __user *optval, 523 int optlen); 524 int (*getsockopt)(struct sock *sk, int level, 525 int optname, char __user *optval, 526 int __user *option); 527 int (*compat_setsockopt)(struct sock *sk, 528 int level, 529 int optname, char __user *optval, 530 int optlen); 531 int (*compat_getsockopt)(struct sock *sk, 532 int level, 533 int optname, char __user *optval, 534 int __user *option); 535 int (*sendmsg)(struct kiocb *iocb, struct sock *sk, 536 struct msghdr *msg, size_t len); 537 int (*recvmsg)(struct kiocb *iocb, struct sock *sk, 538 struct msghdr *msg, 539 size_t len, int noblock, int flags, 540 int *addr_len); 541 int (*sendpage)(struct sock *sk, struct page *page, 542 int offset, size_t size, int flags); 543 int (*bind)(struct sock *sk, 544 struct sockaddr *uaddr, int addr_len); 545 546 int (*backlog_rcv) (struct sock *sk, 547 struct sk_buff *skb); 548 549 /* Keeping track of sk's, looking them up, and port selection methods. */ 550 void (*hash)(struct sock *sk); 551 void (*unhash)(struct sock *sk); 552 int (*get_port)(struct sock *sk, unsigned short snum); 553 554 /* Keeping track of sockets in use */ 555 #ifdef CONFIG_PROC_FS 556 struct pcounter inuse; 557 #endif 558 559 /* Memory pressure */ 560 void (*enter_memory_pressure)(void); 561 atomic_t *memory_allocated; /* Current allocated memory. */ 562 atomic_t *sockets_allocated; /* Current number of sockets. */ 563 /* 564 * Pressure flag: try to collapse. 565 * Technical note: it is used by multiple contexts non atomically. 566 * All the __sk_mem_schedule() is of this nature: accounting 567 * is strict, actions are advisory and have some latency. 568 */ 569 int *memory_pressure; 570 int *sysctl_mem; 571 int *sysctl_wmem; 572 int *sysctl_rmem; 573 int max_header; 574 575 struct kmem_cache *slab; 576 unsigned int obj_size; 577 578 atomic_t *orphan_count; 579 580 struct request_sock_ops *rsk_prot; 581 struct timewait_sock_ops *twsk_prot; 582 583 struct inet_hashinfo *hashinfo; 584 585 struct module *owner; 586 587 char name[32]; 588 589 struct list_head node; 590 #ifdef SOCK_REFCNT_DEBUG 591 atomic_t socks; 592 #endif 593 }; 594 595 extern int proto_register(struct proto *prot, int alloc_slab); 596 extern void proto_unregister(struct proto *prot); 597 598 #ifdef SOCK_REFCNT_DEBUG 599 static inline void sk_refcnt_debug_inc(struct sock *sk) 600 { 601 atomic_inc(&sk->sk_prot->socks); 602 } 603 604 static inline void sk_refcnt_debug_dec(struct sock *sk) 605 { 606 atomic_dec(&sk->sk_prot->socks); 607 printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", 608 sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); 609 } 610 611 static inline void sk_refcnt_debug_release(const struct sock *sk) 612 { 613 if (atomic_read(&sk->sk_refcnt) != 1) 614 printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", 615 sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); 616 } 617 #else /* SOCK_REFCNT_DEBUG */ 618 #define sk_refcnt_debug_inc(sk) do { } while (0) 619 #define sk_refcnt_debug_dec(sk) do { } while (0) 620 #define sk_refcnt_debug_release(sk) do { } while (0) 621 #endif /* SOCK_REFCNT_DEBUG */ 622 623 624 #ifdef CONFIG_PROC_FS 625 # define DEFINE_PROTO_INUSE(NAME) DEFINE_PCOUNTER(NAME) 626 # define REF_PROTO_INUSE(NAME) PCOUNTER_MEMBER_INITIALIZER(NAME, .inuse) 627 /* Called with local bh disabled */ 628 static inline void sock_prot_inuse_add(struct proto *prot, int inc) 629 { 630 pcounter_add(&prot->inuse, inc); 631 } 632 static inline int sock_prot_inuse_init(struct proto *proto) 633 { 634 return pcounter_alloc(&proto->inuse); 635 } 636 static inline int sock_prot_inuse_get(struct proto *proto) 637 { 638 return pcounter_getval(&proto->inuse); 639 } 640 static inline void sock_prot_inuse_free(struct proto *proto) 641 { 642 pcounter_free(&proto->inuse); 643 } 644 #else 645 # define DEFINE_PROTO_INUSE(NAME) 646 # define REF_PROTO_INUSE(NAME) 647 static void inline sock_prot_inuse_add(struct proto *prot, int inc) 648 { 649 } 650 static int inline sock_prot_inuse_init(struct proto *proto) 651 { 652 return 0; 653 } 654 static void inline sock_prot_inuse_free(struct proto *proto) 655 { 656 } 657 #endif 658 659 660 /* With per-bucket locks this operation is not-atomic, so that 661 * this version is not worse. 662 */ 663 static inline void __sk_prot_rehash(struct sock *sk) 664 { 665 sk->sk_prot->unhash(sk); 666 sk->sk_prot->hash(sk); 667 } 668 669 /* About 10 seconds */ 670 #define SOCK_DESTROY_TIME (10*HZ) 671 672 /* Sockets 0-1023 can't be bound to unless you are superuser */ 673 #define PROT_SOCK 1024 674 675 #define SHUTDOWN_MASK 3 676 #define RCV_SHUTDOWN 1 677 #define SEND_SHUTDOWN 2 678 679 #define SOCK_SNDBUF_LOCK 1 680 #define SOCK_RCVBUF_LOCK 2 681 #define SOCK_BINDADDR_LOCK 4 682 #define SOCK_BINDPORT_LOCK 8 683 684 /* sock_iocb: used to kick off async processing of socket ios */ 685 struct sock_iocb { 686 struct list_head list; 687 688 int flags; 689 int size; 690 struct socket *sock; 691 struct sock *sk; 692 struct scm_cookie *scm; 693 struct msghdr *msg, async_msg; 694 struct kiocb *kiocb; 695 }; 696 697 static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) 698 { 699 return (struct sock_iocb *)iocb->private; 700 } 701 702 static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) 703 { 704 return si->kiocb; 705 } 706 707 struct socket_alloc { 708 struct socket socket; 709 struct inode vfs_inode; 710 }; 711 712 static inline struct socket *SOCKET_I(struct inode *inode) 713 { 714 return &container_of(inode, struct socket_alloc, vfs_inode)->socket; 715 } 716 717 static inline struct inode *SOCK_INODE(struct socket *socket) 718 { 719 return &container_of(socket, struct socket_alloc, socket)->vfs_inode; 720 } 721 722 /* 723 * Functions for memory accounting 724 */ 725 extern int __sk_mem_schedule(struct sock *sk, int size, int kind); 726 extern void __sk_mem_reclaim(struct sock *sk); 727 728 #define SK_MEM_QUANTUM ((int)PAGE_SIZE) 729 #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) 730 #define SK_MEM_SEND 0 731 #define SK_MEM_RECV 1 732 733 static inline int sk_mem_pages(int amt) 734 { 735 return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; 736 } 737 738 static inline int sk_has_account(struct sock *sk) 739 { 740 /* return true if protocol supports memory accounting */ 741 return !!sk->sk_prot->memory_allocated; 742 } 743 744 static inline int sk_wmem_schedule(struct sock *sk, int size) 745 { 746 if (!sk_has_account(sk)) 747 return 1; 748 return size <= sk->sk_forward_alloc || 749 __sk_mem_schedule(sk, size, SK_MEM_SEND); 750 } 751 752 static inline int sk_rmem_schedule(struct sock *sk, int size) 753 { 754 if (!sk_has_account(sk)) 755 return 1; 756 return size <= sk->sk_forward_alloc || 757 __sk_mem_schedule(sk, size, SK_MEM_RECV); 758 } 759 760 static inline void sk_mem_reclaim(struct sock *sk) 761 { 762 if (!sk_has_account(sk)) 763 return; 764 if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) 765 __sk_mem_reclaim(sk); 766 } 767 768 static inline void sk_mem_reclaim_partial(struct sock *sk) 769 { 770 if (!sk_has_account(sk)) 771 return; 772 if (sk->sk_forward_alloc > SK_MEM_QUANTUM) 773 __sk_mem_reclaim(sk); 774 } 775 776 static inline void sk_mem_charge(struct sock *sk, int size) 777 { 778 if (!sk_has_account(sk)) 779 return; 780 sk->sk_forward_alloc -= size; 781 } 782 783 static inline void sk_mem_uncharge(struct sock *sk, int size) 784 { 785 if (!sk_has_account(sk)) 786 return; 787 sk->sk_forward_alloc += size; 788 } 789 790 static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) 791 { 792 skb_truesize_check(skb); 793 sock_set_flag(sk, SOCK_QUEUE_SHRUNK); 794 sk->sk_wmem_queued -= skb->truesize; 795 sk_mem_uncharge(sk, skb->truesize); 796 __kfree_skb(skb); 797 } 798 799 /* Used by processes to "lock" a socket state, so that 800 * interrupts and bottom half handlers won't change it 801 * from under us. It essentially blocks any incoming 802 * packets, so that we won't get any new data or any 803 * packets that change the state of the socket. 804 * 805 * While locked, BH processing will add new packets to 806 * the backlog queue. This queue is processed by the 807 * owner of the socket lock right before it is released. 808 * 809 * Since ~2.3.5 it is also exclusive sleep lock serializing 810 * accesses from user process context. 811 */ 812 #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) 813 814 /* 815 * Macro so as to not evaluate some arguments when 816 * lockdep is not enabled. 817 * 818 * Mark both the sk_lock and the sk_lock.slock as a 819 * per-address-family lock class. 820 */ 821 #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ 822 do { \ 823 sk->sk_lock.owned = 0; \ 824 init_waitqueue_head(&sk->sk_lock.wq); \ 825 spin_lock_init(&(sk)->sk_lock.slock); \ 826 debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ 827 sizeof((sk)->sk_lock)); \ 828 lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ 829 (skey), (sname)); \ 830 lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ 831 } while (0) 832 833 extern void lock_sock_nested(struct sock *sk, int subclass); 834 835 static inline void lock_sock(struct sock *sk) 836 { 837 lock_sock_nested(sk, 0); 838 } 839 840 extern void release_sock(struct sock *sk); 841 842 /* BH context may only use the following locking interface. */ 843 #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) 844 #define bh_lock_sock_nested(__sk) \ 845 spin_lock_nested(&((__sk)->sk_lock.slock), \ 846 SINGLE_DEPTH_NESTING) 847 #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) 848 849 extern struct sock *sk_alloc(struct net *net, int family, 850 gfp_t priority, 851 struct proto *prot); 852 extern void sk_free(struct sock *sk); 853 extern struct sock *sk_clone(const struct sock *sk, 854 const gfp_t priority); 855 856 extern struct sk_buff *sock_wmalloc(struct sock *sk, 857 unsigned long size, int force, 858 gfp_t priority); 859 extern struct sk_buff *sock_rmalloc(struct sock *sk, 860 unsigned long size, int force, 861 gfp_t priority); 862 extern void sock_wfree(struct sk_buff *skb); 863 extern void sock_rfree(struct sk_buff *skb); 864 865 extern int sock_setsockopt(struct socket *sock, int level, 866 int op, char __user *optval, 867 int optlen); 868 869 extern int sock_getsockopt(struct socket *sock, int level, 870 int op, char __user *optval, 871 int __user *optlen); 872 extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, 873 unsigned long size, 874 int noblock, 875 int *errcode); 876 extern void *sock_kmalloc(struct sock *sk, int size, 877 gfp_t priority); 878 extern void sock_kfree_s(struct sock *sk, void *mem, int size); 879 extern void sk_send_sigurg(struct sock *sk); 880 881 /* 882 * Functions to fill in entries in struct proto_ops when a protocol 883 * does not implement a particular function. 884 */ 885 extern int sock_no_bind(struct socket *, 886 struct sockaddr *, int); 887 extern int sock_no_connect(struct socket *, 888 struct sockaddr *, int, int); 889 extern int sock_no_socketpair(struct socket *, 890 struct socket *); 891 extern int sock_no_accept(struct socket *, 892 struct socket *, int); 893 extern int sock_no_getname(struct socket *, 894 struct sockaddr *, int *, int); 895 extern unsigned int sock_no_poll(struct file *, struct socket *, 896 struct poll_table_struct *); 897 extern int sock_no_ioctl(struct socket *, unsigned int, 898 unsigned long); 899 extern int sock_no_listen(struct socket *, int); 900 extern int sock_no_shutdown(struct socket *, int); 901 extern int sock_no_getsockopt(struct socket *, int , int, 902 char __user *, int __user *); 903 extern int sock_no_setsockopt(struct socket *, int, int, 904 char __user *, int); 905 extern int sock_no_sendmsg(struct kiocb *, struct socket *, 906 struct msghdr *, size_t); 907 extern int sock_no_recvmsg(struct kiocb *, struct socket *, 908 struct msghdr *, size_t, int); 909 extern int sock_no_mmap(struct file *file, 910 struct socket *sock, 911 struct vm_area_struct *vma); 912 extern ssize_t sock_no_sendpage(struct socket *sock, 913 struct page *page, 914 int offset, size_t size, 915 int flags); 916 917 /* 918 * Functions to fill in entries in struct proto_ops when a protocol 919 * uses the inet style. 920 */ 921 extern int sock_common_getsockopt(struct socket *sock, int level, int optname, 922 char __user *optval, int __user *optlen); 923 extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 924 struct msghdr *msg, size_t size, int flags); 925 extern int sock_common_setsockopt(struct socket *sock, int level, int optname, 926 char __user *optval, int optlen); 927 extern int compat_sock_common_getsockopt(struct socket *sock, int level, 928 int optname, char __user *optval, int __user *optlen); 929 extern int compat_sock_common_setsockopt(struct socket *sock, int level, 930 int optname, char __user *optval, int optlen); 931 932 extern void sk_common_release(struct sock *sk); 933 934 /* 935 * Default socket callbacks and setup code 936 */ 937 938 /* Initialise core socket variables */ 939 extern void sock_init_data(struct socket *sock, struct sock *sk); 940 941 /** 942 * sk_filter - run a packet through a socket filter 943 * @sk: sock associated with &sk_buff 944 * @skb: buffer to filter 945 * @needlock: set to 1 if the sock is not locked by caller. 946 * 947 * Run the filter code and then cut skb->data to correct size returned by 948 * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller 949 * than pkt_len we keep whole skb->data. This is the socket level 950 * wrapper to sk_run_filter. It returns 0 if the packet should 951 * be accepted or -EPERM if the packet should be tossed. 952 * 953 */ 954 955 static inline int sk_filter(struct sock *sk, struct sk_buff *skb) 956 { 957 int err; 958 struct sk_filter *filter; 959 960 err = security_sock_rcv_skb(sk, skb); 961 if (err) 962 return err; 963 964 rcu_read_lock_bh(); 965 filter = rcu_dereference(sk->sk_filter); 966 if (filter) { 967 unsigned int pkt_len = sk_run_filter(skb, filter->insns, 968 filter->len); 969 err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM; 970 } 971 rcu_read_unlock_bh(); 972 973 return err; 974 } 975 976 /** 977 * sk_filter_release: Release a socket filter 978 * @sk: socket 979 * @fp: filter to remove 980 * 981 * Remove a filter from a socket and release its resources. 982 */ 983 984 static inline void sk_filter_release(struct sk_filter *fp) 985 { 986 if (atomic_dec_and_test(&fp->refcnt)) 987 kfree(fp); 988 } 989 990 static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 991 { 992 unsigned int size = sk_filter_len(fp); 993 994 atomic_sub(size, &sk->sk_omem_alloc); 995 sk_filter_release(fp); 996 } 997 998 static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) 999 { 1000 atomic_inc(&fp->refcnt); 1001 atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); 1002 } 1003 1004 /* 1005 * Socket reference counting postulates. 1006 * 1007 * * Each user of socket SHOULD hold a reference count. 1008 * * Each access point to socket (an hash table bucket, reference from a list, 1009 * running timer, skb in flight MUST hold a reference count. 1010 * * When reference count hits 0, it means it will never increase back. 1011 * * When reference count hits 0, it means that no references from 1012 * outside exist to this socket and current process on current CPU 1013 * is last user and may/should destroy this socket. 1014 * * sk_free is called from any context: process, BH, IRQ. When 1015 * it is called, socket has no references from outside -> sk_free 1016 * may release descendant resources allocated by the socket, but 1017 * to the time when it is called, socket is NOT referenced by any 1018 * hash tables, lists etc. 1019 * * Packets, delivered from outside (from network or from another process) 1020 * and enqueued on receive/error queues SHOULD NOT grab reference count, 1021 * when they sit in queue. Otherwise, packets will leak to hole, when 1022 * socket is looked up by one cpu and unhasing is made by another CPU. 1023 * It is true for udp/raw, netlink (leak to receive and error queues), tcp 1024 * (leak to backlog). Packet socket does all the processing inside 1025 * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets 1026 * use separate SMP lock, so that they are prone too. 1027 */ 1028 1029 /* Ungrab socket and destroy it, if it was the last reference. */ 1030 static inline void sock_put(struct sock *sk) 1031 { 1032 if (atomic_dec_and_test(&sk->sk_refcnt)) 1033 sk_free(sk); 1034 } 1035 1036 extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, 1037 const int nested); 1038 1039 /* Detach socket from process context. 1040 * Announce socket dead, detach it from wait queue and inode. 1041 * Note that parent inode held reference count on this struct sock, 1042 * we do not release it in this function, because protocol 1043 * probably wants some additional cleanups or even continuing 1044 * to work with this socket (TCP). 1045 */ 1046 static inline void sock_orphan(struct sock *sk) 1047 { 1048 write_lock_bh(&sk->sk_callback_lock); 1049 sock_set_flag(sk, SOCK_DEAD); 1050 sk->sk_socket = NULL; 1051 sk->sk_sleep = NULL; 1052 write_unlock_bh(&sk->sk_callback_lock); 1053 } 1054 1055 static inline void sock_graft(struct sock *sk, struct socket *parent) 1056 { 1057 write_lock_bh(&sk->sk_callback_lock); 1058 sk->sk_sleep = &parent->wait; 1059 parent->sk = sk; 1060 sk->sk_socket = parent; 1061 security_sock_graft(sk, parent); 1062 write_unlock_bh(&sk->sk_callback_lock); 1063 } 1064 1065 extern int sock_i_uid(struct sock *sk); 1066 extern unsigned long sock_i_ino(struct sock *sk); 1067 1068 static inline struct dst_entry * 1069 __sk_dst_get(struct sock *sk) 1070 { 1071 return sk->sk_dst_cache; 1072 } 1073 1074 static inline struct dst_entry * 1075 sk_dst_get(struct sock *sk) 1076 { 1077 struct dst_entry *dst; 1078 1079 read_lock(&sk->sk_dst_lock); 1080 dst = sk->sk_dst_cache; 1081 if (dst) 1082 dst_hold(dst); 1083 read_unlock(&sk->sk_dst_lock); 1084 return dst; 1085 } 1086 1087 static inline void 1088 __sk_dst_set(struct sock *sk, struct dst_entry *dst) 1089 { 1090 struct dst_entry *old_dst; 1091 1092 old_dst = sk->sk_dst_cache; 1093 sk->sk_dst_cache = dst; 1094 dst_release(old_dst); 1095 } 1096 1097 static inline void 1098 sk_dst_set(struct sock *sk, struct dst_entry *dst) 1099 { 1100 write_lock(&sk->sk_dst_lock); 1101 __sk_dst_set(sk, dst); 1102 write_unlock(&sk->sk_dst_lock); 1103 } 1104 1105 static inline void 1106 __sk_dst_reset(struct sock *sk) 1107 { 1108 struct dst_entry *old_dst; 1109 1110 old_dst = sk->sk_dst_cache; 1111 sk->sk_dst_cache = NULL; 1112 dst_release(old_dst); 1113 } 1114 1115 static inline void 1116 sk_dst_reset(struct sock *sk) 1117 { 1118 write_lock(&sk->sk_dst_lock); 1119 __sk_dst_reset(sk); 1120 write_unlock(&sk->sk_dst_lock); 1121 } 1122 1123 extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); 1124 1125 extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); 1126 1127 static inline int sk_can_gso(const struct sock *sk) 1128 { 1129 return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); 1130 } 1131 1132 extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); 1133 1134 static inline int skb_copy_to_page(struct sock *sk, char __user *from, 1135 struct sk_buff *skb, struct page *page, 1136 int off, int copy) 1137 { 1138 if (skb->ip_summed == CHECKSUM_NONE) { 1139 int err = 0; 1140 __wsum csum = csum_and_copy_from_user(from, 1141 page_address(page) + off, 1142 copy, 0, &err); 1143 if (err) 1144 return err; 1145 skb->csum = csum_block_add(skb->csum, csum, skb->len); 1146 } else if (copy_from_user(page_address(page) + off, from, copy)) 1147 return -EFAULT; 1148 1149 skb->len += copy; 1150 skb->data_len += copy; 1151 skb->truesize += copy; 1152 sk->sk_wmem_queued += copy; 1153 sk_mem_charge(sk, copy); 1154 return 0; 1155 } 1156 1157 /* 1158 * Queue a received datagram if it will fit. Stream and sequenced 1159 * protocols can't normally use this as they need to fit buffers in 1160 * and play with them. 1161 * 1162 * Inlined as it's very short and called for pretty much every 1163 * packet ever received. 1164 */ 1165 1166 static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) 1167 { 1168 sock_hold(sk); 1169 skb->sk = sk; 1170 skb->destructor = sock_wfree; 1171 atomic_add(skb->truesize, &sk->sk_wmem_alloc); 1172 } 1173 1174 static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) 1175 { 1176 skb->sk = sk; 1177 skb->destructor = sock_rfree; 1178 atomic_add(skb->truesize, &sk->sk_rmem_alloc); 1179 sk_mem_charge(sk, skb->truesize); 1180 } 1181 1182 extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1183 unsigned long expires); 1184 1185 extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); 1186 1187 extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); 1188 1189 static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb) 1190 { 1191 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 1192 number of warnings when compiling with -W --ANK 1193 */ 1194 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 1195 (unsigned)sk->sk_rcvbuf) 1196 return -ENOMEM; 1197 skb_set_owner_r(skb, sk); 1198 skb_queue_tail(&sk->sk_error_queue, skb); 1199 if (!sock_flag(sk, SOCK_DEAD)) 1200 sk->sk_data_ready(sk, skb->len); 1201 return 0; 1202 } 1203 1204 /* 1205 * Recover an error report and clear atomically 1206 */ 1207 1208 static inline int sock_error(struct sock *sk) 1209 { 1210 int err; 1211 if (likely(!sk->sk_err)) 1212 return 0; 1213 err = xchg(&sk->sk_err, 0); 1214 return -err; 1215 } 1216 1217 static inline unsigned long sock_wspace(struct sock *sk) 1218 { 1219 int amt = 0; 1220 1221 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { 1222 amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); 1223 if (amt < 0) 1224 amt = 0; 1225 } 1226 return amt; 1227 } 1228 1229 static inline void sk_wake_async(struct sock *sk, int how, int band) 1230 { 1231 if (sk->sk_socket && sk->sk_socket->fasync_list) 1232 sock_wake_async(sk->sk_socket, how, band); 1233 } 1234 1235 #define SOCK_MIN_SNDBUF 2048 1236 #define SOCK_MIN_RCVBUF 256 1237 1238 static inline void sk_stream_moderate_sndbuf(struct sock *sk) 1239 { 1240 if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) { 1241 sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1); 1242 sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); 1243 } 1244 } 1245 1246 struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); 1247 1248 static inline struct page *sk_stream_alloc_page(struct sock *sk) 1249 { 1250 struct page *page = NULL; 1251 1252 page = alloc_pages(sk->sk_allocation, 0); 1253 if (!page) { 1254 sk->sk_prot->enter_memory_pressure(); 1255 sk_stream_moderate_sndbuf(sk); 1256 } 1257 return page; 1258 } 1259 1260 /* 1261 * Default write policy as shown to user space via poll/select/SIGIO 1262 */ 1263 static inline int sock_writeable(const struct sock *sk) 1264 { 1265 return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1); 1266 } 1267 1268 static inline gfp_t gfp_any(void) 1269 { 1270 return in_atomic() ? GFP_ATOMIC : GFP_KERNEL; 1271 } 1272 1273 static inline long sock_rcvtimeo(const struct sock *sk, int noblock) 1274 { 1275 return noblock ? 0 : sk->sk_rcvtimeo; 1276 } 1277 1278 static inline long sock_sndtimeo(const struct sock *sk, int noblock) 1279 { 1280 return noblock ? 0 : sk->sk_sndtimeo; 1281 } 1282 1283 static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) 1284 { 1285 return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; 1286 } 1287 1288 /* Alas, with timeout socket operations are not restartable. 1289 * Compare this to poll(). 1290 */ 1291 static inline int sock_intr_errno(long timeo) 1292 { 1293 return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; 1294 } 1295 1296 extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, 1297 struct sk_buff *skb); 1298 1299 static __inline__ void 1300 sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) 1301 { 1302 ktime_t kt = skb->tstamp; 1303 1304 if (sock_flag(sk, SOCK_RCVTSTAMP)) 1305 __sock_recv_timestamp(msg, sk, skb); 1306 else 1307 sk->sk_stamp = kt; 1308 } 1309 1310 /** 1311 * sk_eat_skb - Release a skb if it is no longer needed 1312 * @sk: socket to eat this skb from 1313 * @skb: socket buffer to eat 1314 * @copied_early: flag indicating whether DMA operations copied this data early 1315 * 1316 * This routine must be called with interrupts disabled or with the socket 1317 * locked so that the sk_buff queue operation is ok. 1318 */ 1319 #ifdef CONFIG_NET_DMA 1320 static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) 1321 { 1322 __skb_unlink(skb, &sk->sk_receive_queue); 1323 if (!copied_early) 1324 __kfree_skb(skb); 1325 else 1326 __skb_queue_tail(&sk->sk_async_wait_queue, skb); 1327 } 1328 #else 1329 static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) 1330 { 1331 __skb_unlink(skb, &sk->sk_receive_queue); 1332 __kfree_skb(skb); 1333 } 1334 #endif 1335 1336 extern void sock_enable_timestamp(struct sock *sk); 1337 extern int sock_get_timestamp(struct sock *, struct timeval __user *); 1338 extern int sock_get_timestampns(struct sock *, struct timespec __user *); 1339 1340 /* 1341 * Enable debug/info messages 1342 */ 1343 extern int net_msg_warn; 1344 #define NETDEBUG(fmt, args...) \ 1345 do { if (net_msg_warn) printk(fmt,##args); } while (0) 1346 1347 #define LIMIT_NETDEBUG(fmt, args...) \ 1348 do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) 1349 1350 /* 1351 * Macros for sleeping on a socket. Use them like this: 1352 * 1353 * SOCK_SLEEP_PRE(sk) 1354 * if (condition) 1355 * schedule(); 1356 * SOCK_SLEEP_POST(sk) 1357 * 1358 * N.B. These are now obsolete and were, afaik, only ever used in DECnet 1359 * and when the last use of them in DECnet has gone, I'm intending to 1360 * remove them. 1361 */ 1362 1363 #define SOCK_SLEEP_PRE(sk) { struct task_struct *tsk = current; \ 1364 DECLARE_WAITQUEUE(wait, tsk); \ 1365 tsk->state = TASK_INTERRUPTIBLE; \ 1366 add_wait_queue((sk)->sk_sleep, &wait); \ 1367 release_sock(sk); 1368 1369 #define SOCK_SLEEP_POST(sk) tsk->state = TASK_RUNNING; \ 1370 remove_wait_queue((sk)->sk_sleep, &wait); \ 1371 lock_sock(sk); \ 1372 } 1373 1374 extern __u32 sysctl_wmem_max; 1375 extern __u32 sysctl_rmem_max; 1376 1377 extern void sk_init(void); 1378 1379 extern int sysctl_optmem_max; 1380 1381 extern __u32 sysctl_wmem_default; 1382 extern __u32 sysctl_rmem_default; 1383 1384 #endif /* _SOCK_H */ 1385