sock.c revision 881d966b48b035ab3f3aeaae0f3d3f9b584f45b2
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 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $ 11 * 12 * Authors: Ross Biro 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 14 * Florian La Roche, <flla@stud.uni-sb.de> 15 * Alan Cox, <A.Cox@swansea.ac.uk> 16 * 17 * Fixes: 18 * Alan Cox : Numerous verify_area() problems 19 * Alan Cox : Connecting on a connecting socket 20 * now returns an error for tcp. 21 * Alan Cox : sock->protocol is set correctly. 22 * and is not sometimes left as 0. 23 * Alan Cox : connect handles icmp errors on a 24 * connect properly. Unfortunately there 25 * is a restart syscall nasty there. I 26 * can't match BSD without hacking the C 27 * library. Ideas urgently sought! 28 * Alan Cox : Disallow bind() to addresses that are 29 * not ours - especially broadcast ones!! 30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 32 * instead they leave that for the DESTROY timer. 33 * Alan Cox : Clean up error flag in accept 34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 35 * was buggy. Put a remove_sock() in the handler 36 * for memory when we hit 0. Also altered the timer 37 * code. The ACK stuff can wait and needs major 38 * TCP layer surgery. 39 * Alan Cox : Fixed TCP ack bug, removed remove sock 40 * and fixed timer/inet_bh race. 41 * Alan Cox : Added zapped flag for TCP 42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 47 * Rick Sladkey : Relaxed UDP rules for matching packets. 48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 49 * Pauline Middelink : identd support 50 * Alan Cox : Fixed connect() taking signals I think. 51 * Alan Cox : SO_LINGER supported 52 * Alan Cox : Error reporting fixes 53 * Anonymous : inet_create tidied up (sk->reuse setting) 54 * Alan Cox : inet sockets don't set sk->type! 55 * Alan Cox : Split socket option code 56 * Alan Cox : Callbacks 57 * Alan Cox : Nagle flag for Charles & Johannes stuff 58 * Alex : Removed restriction on inet fioctl 59 * Alan Cox : Splitting INET from NET core 60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 62 * Alan Cox : Split IP from generic code 63 * Alan Cox : New kfree_skbmem() 64 * Alan Cox : Make SO_DEBUG superuser only. 65 * Alan Cox : Allow anyone to clear SO_DEBUG 66 * (compatibility fix) 67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 68 * Alan Cox : Allocator for a socket is settable. 69 * Alan Cox : SO_ERROR includes soft errors. 70 * Alan Cox : Allow NULL arguments on some SO_ opts 71 * Alan Cox : Generic socket allocation to make hooks 72 * easier (suggested by Craig Metz). 73 * Michael Pall : SO_ERROR returns positive errno again 74 * Steve Whitehouse: Added default destructor to free 75 * protocol private data. 76 * Steve Whitehouse: Added various other default routines 77 * common to several socket families. 78 * Chris Evans : Call suser() check last on F_SETOWN 79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 81 * Andi Kleen : Fix write_space callback 82 * Chris Evans : Security fixes - signedness again 83 * Arnaldo C. Melo : cleanups, use skb_queue_purge 84 * 85 * To Fix: 86 * 87 * 88 * This program is free software; you can redistribute it and/or 89 * modify it under the terms of the GNU General Public License 90 * as published by the Free Software Foundation; either version 91 * 2 of the License, or (at your option) any later version. 92 */ 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> 115 116#include <asm/uaccess.h> 117#include <asm/system.h> 118 119#include <linux/netdevice.h> 120#include <net/protocol.h> 121#include <linux/skbuff.h> 122#include <net/net_namespace.h> 123#include <net/request_sock.h> 124#include <net/sock.h> 125#include <net/xfrm.h> 126#include <linux/ipsec.h> 127 128#include <linux/filter.h> 129 130#ifdef CONFIG_INET 131#include <net/tcp.h> 132#endif 133 134/* 135 * Each address family might have different locking rules, so we have 136 * one slock key per address family: 137 */ 138static struct lock_class_key af_family_keys[AF_MAX]; 139static struct lock_class_key af_family_slock_keys[AF_MAX]; 140 141#ifdef CONFIG_DEBUG_LOCK_ALLOC 142/* 143 * Make lock validator output more readable. (we pre-construct these 144 * strings build-time, so that runtime initialization of socket 145 * locks is fast): 146 */ 147static const char *af_family_key_strings[AF_MAX+1] = { 148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 157 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" , 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX" 160}; 161static const char *af_family_slock_key_strings[AF_MAX+1] = { 162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 171 "slock-27" , "slock-28" , "slock-29" , 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 173 "slock-AF_RXRPC" , "slock-AF_MAX" 174}; 175static const char *af_family_clock_key_strings[AF_MAX+1] = { 176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , 184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 185 "clock-27" , "clock-28" , "clock-29" , 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 187 "clock-AF_RXRPC" , "clock-AF_MAX" 188}; 189#endif 190 191/* 192 * sk_callback_lock locking rules are per-address-family, 193 * so split the lock classes by using a per-AF key: 194 */ 195static struct lock_class_key af_callback_keys[AF_MAX]; 196 197/* Take into consideration the size of the struct sk_buff overhead in the 198 * determination of these values, since that is non-constant across 199 * platforms. This makes socket queueing behavior and performance 200 * not depend upon such differences. 201 */ 202#define _SK_MEM_PACKETS 256 203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 206 207/* Run time adjustable parameters. */ 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 212 213/* Maximal space eaten by iovec or ancilliary data plus some space */ 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 215 216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 217{ 218 struct timeval tv; 219 220 if (optlen < sizeof(tv)) 221 return -EINVAL; 222 if (copy_from_user(&tv, optval, sizeof(tv))) 223 return -EFAULT; 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 225 return -EDOM; 226 227 if (tv.tv_sec < 0) { 228 static int warned __read_mostly; 229 230 *timeo_p = 0; 231 if (warned < 10 && net_ratelimit()) 232 warned++; 233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 234 "tries to set negative timeout\n", 235 current->comm, current->pid); 236 return 0; 237 } 238 *timeo_p = MAX_SCHEDULE_TIMEOUT; 239 if (tv.tv_sec == 0 && tv.tv_usec == 0) 240 return 0; 241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 243 return 0; 244} 245 246static void sock_warn_obsolete_bsdism(const char *name) 247{ 248 static int warned; 249 static char warncomm[TASK_COMM_LEN]; 250 if (strcmp(warncomm, current->comm) && warned < 5) { 251 strcpy(warncomm, current->comm); 252 printk(KERN_WARNING "process `%s' is using obsolete " 253 "%s SO_BSDCOMPAT\n", warncomm, name); 254 warned++; 255 } 256} 257 258static void sock_disable_timestamp(struct sock *sk) 259{ 260 if (sock_flag(sk, SOCK_TIMESTAMP)) { 261 sock_reset_flag(sk, SOCK_TIMESTAMP); 262 net_disable_timestamp(); 263 } 264} 265 266 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 268{ 269 int err = 0; 270 int skb_len; 271 272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 273 number of warnings when compiling with -W --ANK 274 */ 275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 276 (unsigned)sk->sk_rcvbuf) { 277 err = -ENOMEM; 278 goto out; 279 } 280 281 err = sk_filter(sk, skb); 282 if (err) 283 goto out; 284 285 skb->dev = NULL; 286 skb_set_owner_r(skb, sk); 287 288 /* Cache the SKB length before we tack it onto the receive 289 * queue. Once it is added it no longer belongs to us and 290 * may be freed by other threads of control pulling packets 291 * from the queue. 292 */ 293 skb_len = skb->len; 294 295 skb_queue_tail(&sk->sk_receive_queue, skb); 296 297 if (!sock_flag(sk, SOCK_DEAD)) 298 sk->sk_data_ready(sk, skb_len); 299out: 300 return err; 301} 302EXPORT_SYMBOL(sock_queue_rcv_skb); 303 304int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 305{ 306 int rc = NET_RX_SUCCESS; 307 308 if (sk_filter(sk, skb)) 309 goto discard_and_relse; 310 311 skb->dev = NULL; 312 313 if (nested) 314 bh_lock_sock_nested(sk); 315 else 316 bh_lock_sock(sk); 317 if (!sock_owned_by_user(sk)) { 318 /* 319 * trylock + unlock semantics: 320 */ 321 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 322 323 rc = sk->sk_backlog_rcv(sk, skb); 324 325 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 326 } else 327 sk_add_backlog(sk, skb); 328 bh_unlock_sock(sk); 329out: 330 sock_put(sk); 331 return rc; 332discard_and_relse: 333 kfree_skb(skb); 334 goto out; 335} 336EXPORT_SYMBOL(sk_receive_skb); 337 338struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 339{ 340 struct dst_entry *dst = sk->sk_dst_cache; 341 342 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 343 sk->sk_dst_cache = NULL; 344 dst_release(dst); 345 return NULL; 346 } 347 348 return dst; 349} 350EXPORT_SYMBOL(__sk_dst_check); 351 352struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 353{ 354 struct dst_entry *dst = sk_dst_get(sk); 355 356 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 357 sk_dst_reset(sk); 358 dst_release(dst); 359 return NULL; 360 } 361 362 return dst; 363} 364EXPORT_SYMBOL(sk_dst_check); 365 366static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 367{ 368 int ret = -ENOPROTOOPT; 369#ifdef CONFIG_NETDEVICES 370 struct net *net = sk->sk_net; 371 char devname[IFNAMSIZ]; 372 int index; 373 374 /* Sorry... */ 375 ret = -EPERM; 376 if (!capable(CAP_NET_RAW)) 377 goto out; 378 379 ret = -EINVAL; 380 if (optlen < 0) 381 goto out; 382 383 /* Bind this socket to a particular device like "eth0", 384 * as specified in the passed interface name. If the 385 * name is "" or the option length is zero the socket 386 * is not bound. 387 */ 388 if (optlen > IFNAMSIZ - 1) 389 optlen = IFNAMSIZ - 1; 390 memset(devname, 0, sizeof(devname)); 391 392 ret = -EFAULT; 393 if (copy_from_user(devname, optval, optlen)) 394 goto out; 395 396 if (devname[0] == '\0') { 397 index = 0; 398 } else { 399 struct net_device *dev = dev_get_by_name(net, devname); 400 401 ret = -ENODEV; 402 if (!dev) 403 goto out; 404 405 index = dev->ifindex; 406 dev_put(dev); 407 } 408 409 lock_sock(sk); 410 sk->sk_bound_dev_if = index; 411 sk_dst_reset(sk); 412 release_sock(sk); 413 414 ret = 0; 415 416out: 417#endif 418 419 return ret; 420} 421 422/* 423 * This is meant for all protocols to use and covers goings on 424 * at the socket level. Everything here is generic. 425 */ 426 427int sock_setsockopt(struct socket *sock, int level, int optname, 428 char __user *optval, int optlen) 429{ 430 struct sock *sk=sock->sk; 431 struct sk_filter *filter; 432 int val; 433 int valbool; 434 struct linger ling; 435 int ret = 0; 436 437 /* 438 * Options without arguments 439 */ 440 441#ifdef SO_DONTLINGER /* Compatibility item... */ 442 if (optname == SO_DONTLINGER) { 443 lock_sock(sk); 444 sock_reset_flag(sk, SOCK_LINGER); 445 release_sock(sk); 446 return 0; 447 } 448#endif 449 450 if (optname == SO_BINDTODEVICE) 451 return sock_bindtodevice(sk, optval, optlen); 452 453 if (optlen < sizeof(int)) 454 return -EINVAL; 455 456 if (get_user(val, (int __user *)optval)) 457 return -EFAULT; 458 459 valbool = val?1:0; 460 461 lock_sock(sk); 462 463 switch(optname) { 464 case SO_DEBUG: 465 if (val && !capable(CAP_NET_ADMIN)) { 466 ret = -EACCES; 467 } 468 else if (valbool) 469 sock_set_flag(sk, SOCK_DBG); 470 else 471 sock_reset_flag(sk, SOCK_DBG); 472 break; 473 case SO_REUSEADDR: 474 sk->sk_reuse = valbool; 475 break; 476 case SO_TYPE: 477 case SO_ERROR: 478 ret = -ENOPROTOOPT; 479 break; 480 case SO_DONTROUTE: 481 if (valbool) 482 sock_set_flag(sk, SOCK_LOCALROUTE); 483 else 484 sock_reset_flag(sk, SOCK_LOCALROUTE); 485 break; 486 case SO_BROADCAST: 487 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 488 break; 489 case SO_SNDBUF: 490 /* Don't error on this BSD doesn't and if you think 491 about it this is right. Otherwise apps have to 492 play 'guess the biggest size' games. RCVBUF/SNDBUF 493 are treated in BSD as hints */ 494 495 if (val > sysctl_wmem_max) 496 val = sysctl_wmem_max; 497set_sndbuf: 498 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 499 if ((val * 2) < SOCK_MIN_SNDBUF) 500 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 501 else 502 sk->sk_sndbuf = val * 2; 503 504 /* 505 * Wake up sending tasks if we 506 * upped the value. 507 */ 508 sk->sk_write_space(sk); 509 break; 510 511 case SO_SNDBUFFORCE: 512 if (!capable(CAP_NET_ADMIN)) { 513 ret = -EPERM; 514 break; 515 } 516 goto set_sndbuf; 517 518 case SO_RCVBUF: 519 /* Don't error on this BSD doesn't and if you think 520 about it this is right. Otherwise apps have to 521 play 'guess the biggest size' games. RCVBUF/SNDBUF 522 are treated in BSD as hints */ 523 524 if (val > sysctl_rmem_max) 525 val = sysctl_rmem_max; 526set_rcvbuf: 527 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 528 /* 529 * We double it on the way in to account for 530 * "struct sk_buff" etc. overhead. Applications 531 * assume that the SO_RCVBUF setting they make will 532 * allow that much actual data to be received on that 533 * socket. 534 * 535 * Applications are unaware that "struct sk_buff" and 536 * other overheads allocate from the receive buffer 537 * during socket buffer allocation. 538 * 539 * And after considering the possible alternatives, 540 * returning the value we actually used in getsockopt 541 * is the most desirable behavior. 542 */ 543 if ((val * 2) < SOCK_MIN_RCVBUF) 544 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 545 else 546 sk->sk_rcvbuf = val * 2; 547 break; 548 549 case SO_RCVBUFFORCE: 550 if (!capable(CAP_NET_ADMIN)) { 551 ret = -EPERM; 552 break; 553 } 554 goto set_rcvbuf; 555 556 case SO_KEEPALIVE: 557#ifdef CONFIG_INET 558 if (sk->sk_protocol == IPPROTO_TCP) 559 tcp_set_keepalive(sk, valbool); 560#endif 561 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 562 break; 563 564 case SO_OOBINLINE: 565 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 566 break; 567 568 case SO_NO_CHECK: 569 sk->sk_no_check = valbool; 570 break; 571 572 case SO_PRIORITY: 573 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 574 sk->sk_priority = val; 575 else 576 ret = -EPERM; 577 break; 578 579 case SO_LINGER: 580 if (optlen < sizeof(ling)) { 581 ret = -EINVAL; /* 1003.1g */ 582 break; 583 } 584 if (copy_from_user(&ling,optval,sizeof(ling))) { 585 ret = -EFAULT; 586 break; 587 } 588 if (!ling.l_onoff) 589 sock_reset_flag(sk, SOCK_LINGER); 590 else { 591#if (BITS_PER_LONG == 32) 592 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 593 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 594 else 595#endif 596 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 597 sock_set_flag(sk, SOCK_LINGER); 598 } 599 break; 600 601 case SO_BSDCOMPAT: 602 sock_warn_obsolete_bsdism("setsockopt"); 603 break; 604 605 case SO_PASSCRED: 606 if (valbool) 607 set_bit(SOCK_PASSCRED, &sock->flags); 608 else 609 clear_bit(SOCK_PASSCRED, &sock->flags); 610 break; 611 612 case SO_TIMESTAMP: 613 case SO_TIMESTAMPNS: 614 if (valbool) { 615 if (optname == SO_TIMESTAMP) 616 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 617 else 618 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 619 sock_set_flag(sk, SOCK_RCVTSTAMP); 620 sock_enable_timestamp(sk); 621 } else { 622 sock_reset_flag(sk, SOCK_RCVTSTAMP); 623 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 624 } 625 break; 626 627 case SO_RCVLOWAT: 628 if (val < 0) 629 val = INT_MAX; 630 sk->sk_rcvlowat = val ? : 1; 631 break; 632 633 case SO_RCVTIMEO: 634 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 635 break; 636 637 case SO_SNDTIMEO: 638 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 639 break; 640 641 case SO_ATTACH_FILTER: 642 ret = -EINVAL; 643 if (optlen == sizeof(struct sock_fprog)) { 644 struct sock_fprog fprog; 645 646 ret = -EFAULT; 647 if (copy_from_user(&fprog, optval, sizeof(fprog))) 648 break; 649 650 ret = sk_attach_filter(&fprog, sk); 651 } 652 break; 653 654 case SO_DETACH_FILTER: 655 rcu_read_lock_bh(); 656 filter = rcu_dereference(sk->sk_filter); 657 if (filter) { 658 rcu_assign_pointer(sk->sk_filter, NULL); 659 sk_filter_release(sk, filter); 660 rcu_read_unlock_bh(); 661 break; 662 } 663 rcu_read_unlock_bh(); 664 ret = -ENONET; 665 break; 666 667 case SO_PASSSEC: 668 if (valbool) 669 set_bit(SOCK_PASSSEC, &sock->flags); 670 else 671 clear_bit(SOCK_PASSSEC, &sock->flags); 672 break; 673 674 /* We implement the SO_SNDLOWAT etc to 675 not be settable (1003.1g 5.3) */ 676 default: 677 ret = -ENOPROTOOPT; 678 break; 679 } 680 release_sock(sk); 681 return ret; 682} 683 684 685int sock_getsockopt(struct socket *sock, int level, int optname, 686 char __user *optval, int __user *optlen) 687{ 688 struct sock *sk = sock->sk; 689 690 union { 691 int val; 692 struct linger ling; 693 struct timeval tm; 694 } v; 695 696 unsigned int lv = sizeof(int); 697 int len; 698 699 if (get_user(len, optlen)) 700 return -EFAULT; 701 if (len < 0) 702 return -EINVAL; 703 704 switch(optname) { 705 case SO_DEBUG: 706 v.val = sock_flag(sk, SOCK_DBG); 707 break; 708 709 case SO_DONTROUTE: 710 v.val = sock_flag(sk, SOCK_LOCALROUTE); 711 break; 712 713 case SO_BROADCAST: 714 v.val = !!sock_flag(sk, SOCK_BROADCAST); 715 break; 716 717 case SO_SNDBUF: 718 v.val = sk->sk_sndbuf; 719 break; 720 721 case SO_RCVBUF: 722 v.val = sk->sk_rcvbuf; 723 break; 724 725 case SO_REUSEADDR: 726 v.val = sk->sk_reuse; 727 break; 728 729 case SO_KEEPALIVE: 730 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 731 break; 732 733 case SO_TYPE: 734 v.val = sk->sk_type; 735 break; 736 737 case SO_ERROR: 738 v.val = -sock_error(sk); 739 if (v.val==0) 740 v.val = xchg(&sk->sk_err_soft, 0); 741 break; 742 743 case SO_OOBINLINE: 744 v.val = !!sock_flag(sk, SOCK_URGINLINE); 745 break; 746 747 case SO_NO_CHECK: 748 v.val = sk->sk_no_check; 749 break; 750 751 case SO_PRIORITY: 752 v.val = sk->sk_priority; 753 break; 754 755 case SO_LINGER: 756 lv = sizeof(v.ling); 757 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 758 v.ling.l_linger = sk->sk_lingertime / HZ; 759 break; 760 761 case SO_BSDCOMPAT: 762 sock_warn_obsolete_bsdism("getsockopt"); 763 break; 764 765 case SO_TIMESTAMP: 766 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 767 !sock_flag(sk, SOCK_RCVTSTAMPNS); 768 break; 769 770 case SO_TIMESTAMPNS: 771 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 772 break; 773 774 case SO_RCVTIMEO: 775 lv=sizeof(struct timeval); 776 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 777 v.tm.tv_sec = 0; 778 v.tm.tv_usec = 0; 779 } else { 780 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 781 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 782 } 783 break; 784 785 case SO_SNDTIMEO: 786 lv=sizeof(struct timeval); 787 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 788 v.tm.tv_sec = 0; 789 v.tm.tv_usec = 0; 790 } else { 791 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 792 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 793 } 794 break; 795 796 case SO_RCVLOWAT: 797 v.val = sk->sk_rcvlowat; 798 break; 799 800 case SO_SNDLOWAT: 801 v.val=1; 802 break; 803 804 case SO_PASSCRED: 805 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 806 break; 807 808 case SO_PEERCRED: 809 if (len > sizeof(sk->sk_peercred)) 810 len = sizeof(sk->sk_peercred); 811 if (copy_to_user(optval, &sk->sk_peercred, len)) 812 return -EFAULT; 813 goto lenout; 814 815 case SO_PEERNAME: 816 { 817 char address[128]; 818 819 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 820 return -ENOTCONN; 821 if (lv < len) 822 return -EINVAL; 823 if (copy_to_user(optval, address, len)) 824 return -EFAULT; 825 goto lenout; 826 } 827 828 /* Dubious BSD thing... Probably nobody even uses it, but 829 * the UNIX standard wants it for whatever reason... -DaveM 830 */ 831 case SO_ACCEPTCONN: 832 v.val = sk->sk_state == TCP_LISTEN; 833 break; 834 835 case SO_PASSSEC: 836 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 837 break; 838 839 case SO_PEERSEC: 840 return security_socket_getpeersec_stream(sock, optval, optlen, len); 841 842 default: 843 return -ENOPROTOOPT; 844 } 845 846 if (len > lv) 847 len = lv; 848 if (copy_to_user(optval, &v, len)) 849 return -EFAULT; 850lenout: 851 if (put_user(len, optlen)) 852 return -EFAULT; 853 return 0; 854} 855 856/* 857 * Initialize an sk_lock. 858 * 859 * (We also register the sk_lock with the lock validator.) 860 */ 861static inline void sock_lock_init(struct sock *sk) 862{ 863 sock_lock_init_class_and_name(sk, 864 af_family_slock_key_strings[sk->sk_family], 865 af_family_slock_keys + sk->sk_family, 866 af_family_key_strings[sk->sk_family], 867 af_family_keys + sk->sk_family); 868} 869 870/** 871 * sk_alloc - All socket objects are allocated here 872 * @family: protocol family 873 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 874 * @prot: struct proto associated with this new sock instance 875 * @zero_it: if we should zero the newly allocated sock 876 */ 877struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 878 struct proto *prot, int zero_it) 879{ 880 struct sock *sk = NULL; 881 struct kmem_cache *slab = prot->slab; 882 883 if (slab != NULL) 884 sk = kmem_cache_alloc(slab, priority); 885 else 886 sk = kmalloc(prot->obj_size, priority); 887 888 if (sk) { 889 if (zero_it) { 890 memset(sk, 0, prot->obj_size); 891 sk->sk_family = family; 892 /* 893 * See comment in struct sock definition to understand 894 * why we need sk_prot_creator -acme 895 */ 896 sk->sk_prot = sk->sk_prot_creator = prot; 897 sock_lock_init(sk); 898 sk->sk_net = get_net(net); 899 } 900 901 if (security_sk_alloc(sk, family, priority)) 902 goto out_free; 903 904 if (!try_module_get(prot->owner)) 905 goto out_free; 906 } 907 return sk; 908 909out_free: 910 if (slab != NULL) 911 kmem_cache_free(slab, sk); 912 else 913 kfree(sk); 914 return NULL; 915} 916 917void sk_free(struct sock *sk) 918{ 919 struct sk_filter *filter; 920 struct module *owner = sk->sk_prot_creator->owner; 921 922 if (sk->sk_destruct) 923 sk->sk_destruct(sk); 924 925 filter = rcu_dereference(sk->sk_filter); 926 if (filter) { 927 sk_filter_release(sk, filter); 928 rcu_assign_pointer(sk->sk_filter, NULL); 929 } 930 931 sock_disable_timestamp(sk); 932 933 if (atomic_read(&sk->sk_omem_alloc)) 934 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 935 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 936 937 security_sk_free(sk); 938 put_net(sk->sk_net); 939 if (sk->sk_prot_creator->slab != NULL) 940 kmem_cache_free(sk->sk_prot_creator->slab, sk); 941 else 942 kfree(sk); 943 module_put(owner); 944} 945 946struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 947{ 948 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0); 949 950 if (newsk != NULL) { 951 struct sk_filter *filter; 952 953 sock_copy(newsk, sk); 954 955 /* SANITY */ 956 sk_node_init(&newsk->sk_node); 957 sock_lock_init(newsk); 958 bh_lock_sock(newsk); 959 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 960 961 atomic_set(&newsk->sk_rmem_alloc, 0); 962 atomic_set(&newsk->sk_wmem_alloc, 0); 963 atomic_set(&newsk->sk_omem_alloc, 0); 964 skb_queue_head_init(&newsk->sk_receive_queue); 965 skb_queue_head_init(&newsk->sk_write_queue); 966#ifdef CONFIG_NET_DMA 967 skb_queue_head_init(&newsk->sk_async_wait_queue); 968#endif 969 970 rwlock_init(&newsk->sk_dst_lock); 971 rwlock_init(&newsk->sk_callback_lock); 972 lockdep_set_class_and_name(&newsk->sk_callback_lock, 973 af_callback_keys + newsk->sk_family, 974 af_family_clock_key_strings[newsk->sk_family]); 975 976 newsk->sk_dst_cache = NULL; 977 newsk->sk_wmem_queued = 0; 978 newsk->sk_forward_alloc = 0; 979 newsk->sk_send_head = NULL; 980 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 981 982 sock_reset_flag(newsk, SOCK_DONE); 983 skb_queue_head_init(&newsk->sk_error_queue); 984 985 filter = newsk->sk_filter; 986 if (filter != NULL) 987 sk_filter_charge(newsk, filter); 988 989 if (unlikely(xfrm_sk_clone_policy(newsk))) { 990 /* It is still raw copy of parent, so invalidate 991 * destructor and make plain sk_free() */ 992 newsk->sk_destruct = NULL; 993 sk_free(newsk); 994 newsk = NULL; 995 goto out; 996 } 997 998 newsk->sk_err = 0; 999 newsk->sk_priority = 0; 1000 atomic_set(&newsk->sk_refcnt, 2); 1001 1002 /* 1003 * Increment the counter in the same struct proto as the master 1004 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1005 * is the same as sk->sk_prot->socks, as this field was copied 1006 * with memcpy). 1007 * 1008 * This _changes_ the previous behaviour, where 1009 * tcp_create_openreq_child always was incrementing the 1010 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1011 * to be taken into account in all callers. -acme 1012 */ 1013 sk_refcnt_debug_inc(newsk); 1014 newsk->sk_socket = NULL; 1015 newsk->sk_sleep = NULL; 1016 1017 if (newsk->sk_prot->sockets_allocated) 1018 atomic_inc(newsk->sk_prot->sockets_allocated); 1019 } 1020out: 1021 return newsk; 1022} 1023 1024EXPORT_SYMBOL_GPL(sk_clone); 1025 1026void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1027{ 1028 __sk_dst_set(sk, dst); 1029 sk->sk_route_caps = dst->dev->features; 1030 if (sk->sk_route_caps & NETIF_F_GSO) 1031 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1032 if (sk_can_gso(sk)) { 1033 if (dst->header_len) 1034 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1035 else 1036 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1037 } 1038} 1039EXPORT_SYMBOL_GPL(sk_setup_caps); 1040 1041void __init sk_init(void) 1042{ 1043 if (num_physpages <= 4096) { 1044 sysctl_wmem_max = 32767; 1045 sysctl_rmem_max = 32767; 1046 sysctl_wmem_default = 32767; 1047 sysctl_rmem_default = 32767; 1048 } else if (num_physpages >= 131072) { 1049 sysctl_wmem_max = 131071; 1050 sysctl_rmem_max = 131071; 1051 } 1052} 1053 1054/* 1055 * Simple resource managers for sockets. 1056 */ 1057 1058 1059/* 1060 * Write buffer destructor automatically called from kfree_skb. 1061 */ 1062void sock_wfree(struct sk_buff *skb) 1063{ 1064 struct sock *sk = skb->sk; 1065 1066 /* In case it might be waiting for more memory. */ 1067 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1068 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1069 sk->sk_write_space(sk); 1070 sock_put(sk); 1071} 1072 1073/* 1074 * Read buffer destructor automatically called from kfree_skb. 1075 */ 1076void sock_rfree(struct sk_buff *skb) 1077{ 1078 struct sock *sk = skb->sk; 1079 1080 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1081} 1082 1083 1084int sock_i_uid(struct sock *sk) 1085{ 1086 int uid; 1087 1088 read_lock(&sk->sk_callback_lock); 1089 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1090 read_unlock(&sk->sk_callback_lock); 1091 return uid; 1092} 1093 1094unsigned long sock_i_ino(struct sock *sk) 1095{ 1096 unsigned long ino; 1097 1098 read_lock(&sk->sk_callback_lock); 1099 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1100 read_unlock(&sk->sk_callback_lock); 1101 return ino; 1102} 1103 1104/* 1105 * Allocate a skb from the socket's send buffer. 1106 */ 1107struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1108 gfp_t priority) 1109{ 1110 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1111 struct sk_buff * skb = alloc_skb(size, priority); 1112 if (skb) { 1113 skb_set_owner_w(skb, sk); 1114 return skb; 1115 } 1116 } 1117 return NULL; 1118} 1119 1120/* 1121 * Allocate a skb from the socket's receive buffer. 1122 */ 1123struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1124 gfp_t priority) 1125{ 1126 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1127 struct sk_buff *skb = alloc_skb(size, priority); 1128 if (skb) { 1129 skb_set_owner_r(skb, sk); 1130 return skb; 1131 } 1132 } 1133 return NULL; 1134} 1135 1136/* 1137 * Allocate a memory block from the socket's option memory buffer. 1138 */ 1139void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1140{ 1141 if ((unsigned)size <= sysctl_optmem_max && 1142 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1143 void *mem; 1144 /* First do the add, to avoid the race if kmalloc 1145 * might sleep. 1146 */ 1147 atomic_add(size, &sk->sk_omem_alloc); 1148 mem = kmalloc(size, priority); 1149 if (mem) 1150 return mem; 1151 atomic_sub(size, &sk->sk_omem_alloc); 1152 } 1153 return NULL; 1154} 1155 1156/* 1157 * Free an option memory block. 1158 */ 1159void sock_kfree_s(struct sock *sk, void *mem, int size) 1160{ 1161 kfree(mem); 1162 atomic_sub(size, &sk->sk_omem_alloc); 1163} 1164 1165/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1166 I think, these locks should be removed for datagram sockets. 1167 */ 1168static long sock_wait_for_wmem(struct sock * sk, long timeo) 1169{ 1170 DEFINE_WAIT(wait); 1171 1172 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1173 for (;;) { 1174 if (!timeo) 1175 break; 1176 if (signal_pending(current)) 1177 break; 1178 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1179 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1180 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1181 break; 1182 if (sk->sk_shutdown & SEND_SHUTDOWN) 1183 break; 1184 if (sk->sk_err) 1185 break; 1186 timeo = schedule_timeout(timeo); 1187 } 1188 finish_wait(sk->sk_sleep, &wait); 1189 return timeo; 1190} 1191 1192 1193/* 1194 * Generic send/receive buffer handlers 1195 */ 1196 1197static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1198 unsigned long header_len, 1199 unsigned long data_len, 1200 int noblock, int *errcode) 1201{ 1202 struct sk_buff *skb; 1203 gfp_t gfp_mask; 1204 long timeo; 1205 int err; 1206 1207 gfp_mask = sk->sk_allocation; 1208 if (gfp_mask & __GFP_WAIT) 1209 gfp_mask |= __GFP_REPEAT; 1210 1211 timeo = sock_sndtimeo(sk, noblock); 1212 while (1) { 1213 err = sock_error(sk); 1214 if (err != 0) 1215 goto failure; 1216 1217 err = -EPIPE; 1218 if (sk->sk_shutdown & SEND_SHUTDOWN) 1219 goto failure; 1220 1221 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1222 skb = alloc_skb(header_len, gfp_mask); 1223 if (skb) { 1224 int npages; 1225 int i; 1226 1227 /* No pages, we're done... */ 1228 if (!data_len) 1229 break; 1230 1231 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1232 skb->truesize += data_len; 1233 skb_shinfo(skb)->nr_frags = npages; 1234 for (i = 0; i < npages; i++) { 1235 struct page *page; 1236 skb_frag_t *frag; 1237 1238 page = alloc_pages(sk->sk_allocation, 0); 1239 if (!page) { 1240 err = -ENOBUFS; 1241 skb_shinfo(skb)->nr_frags = i; 1242 kfree_skb(skb); 1243 goto failure; 1244 } 1245 1246 frag = &skb_shinfo(skb)->frags[i]; 1247 frag->page = page; 1248 frag->page_offset = 0; 1249 frag->size = (data_len >= PAGE_SIZE ? 1250 PAGE_SIZE : 1251 data_len); 1252 data_len -= PAGE_SIZE; 1253 } 1254 1255 /* Full success... */ 1256 break; 1257 } 1258 err = -ENOBUFS; 1259 goto failure; 1260 } 1261 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1262 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1263 err = -EAGAIN; 1264 if (!timeo) 1265 goto failure; 1266 if (signal_pending(current)) 1267 goto interrupted; 1268 timeo = sock_wait_for_wmem(sk, timeo); 1269 } 1270 1271 skb_set_owner_w(skb, sk); 1272 return skb; 1273 1274interrupted: 1275 err = sock_intr_errno(timeo); 1276failure: 1277 *errcode = err; 1278 return NULL; 1279} 1280 1281struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1282 int noblock, int *errcode) 1283{ 1284 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1285} 1286 1287static void __lock_sock(struct sock *sk) 1288{ 1289 DEFINE_WAIT(wait); 1290 1291 for (;;) { 1292 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1293 TASK_UNINTERRUPTIBLE); 1294 spin_unlock_bh(&sk->sk_lock.slock); 1295 schedule(); 1296 spin_lock_bh(&sk->sk_lock.slock); 1297 if (!sock_owned_by_user(sk)) 1298 break; 1299 } 1300 finish_wait(&sk->sk_lock.wq, &wait); 1301} 1302 1303static void __release_sock(struct sock *sk) 1304{ 1305 struct sk_buff *skb = sk->sk_backlog.head; 1306 1307 do { 1308 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1309 bh_unlock_sock(sk); 1310 1311 do { 1312 struct sk_buff *next = skb->next; 1313 1314 skb->next = NULL; 1315 sk->sk_backlog_rcv(sk, skb); 1316 1317 /* 1318 * We are in process context here with softirqs 1319 * disabled, use cond_resched_softirq() to preempt. 1320 * This is safe to do because we've taken the backlog 1321 * queue private: 1322 */ 1323 cond_resched_softirq(); 1324 1325 skb = next; 1326 } while (skb != NULL); 1327 1328 bh_lock_sock(sk); 1329 } while ((skb = sk->sk_backlog.head) != NULL); 1330} 1331 1332/** 1333 * sk_wait_data - wait for data to arrive at sk_receive_queue 1334 * @sk: sock to wait on 1335 * @timeo: for how long 1336 * 1337 * Now socket state including sk->sk_err is changed only under lock, 1338 * hence we may omit checks after joining wait queue. 1339 * We check receive queue before schedule() only as optimization; 1340 * it is very likely that release_sock() added new data. 1341 */ 1342int sk_wait_data(struct sock *sk, long *timeo) 1343{ 1344 int rc; 1345 DEFINE_WAIT(wait); 1346 1347 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1348 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1349 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1350 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1351 finish_wait(sk->sk_sleep, &wait); 1352 return rc; 1353} 1354 1355EXPORT_SYMBOL(sk_wait_data); 1356 1357/* 1358 * Set of default routines for initialising struct proto_ops when 1359 * the protocol does not support a particular function. In certain 1360 * cases where it makes no sense for a protocol to have a "do nothing" 1361 * function, some default processing is provided. 1362 */ 1363 1364int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1365{ 1366 return -EOPNOTSUPP; 1367} 1368 1369int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1370 int len, int flags) 1371{ 1372 return -EOPNOTSUPP; 1373} 1374 1375int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1376{ 1377 return -EOPNOTSUPP; 1378} 1379 1380int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1381{ 1382 return -EOPNOTSUPP; 1383} 1384 1385int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1386 int *len, int peer) 1387{ 1388 return -EOPNOTSUPP; 1389} 1390 1391unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1392{ 1393 return 0; 1394} 1395 1396int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1397{ 1398 return -EOPNOTSUPP; 1399} 1400 1401int sock_no_listen(struct socket *sock, int backlog) 1402{ 1403 return -EOPNOTSUPP; 1404} 1405 1406int sock_no_shutdown(struct socket *sock, int how) 1407{ 1408 return -EOPNOTSUPP; 1409} 1410 1411int sock_no_setsockopt(struct socket *sock, int level, int optname, 1412 char __user *optval, int optlen) 1413{ 1414 return -EOPNOTSUPP; 1415} 1416 1417int sock_no_getsockopt(struct socket *sock, int level, int optname, 1418 char __user *optval, int __user *optlen) 1419{ 1420 return -EOPNOTSUPP; 1421} 1422 1423int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1424 size_t len) 1425{ 1426 return -EOPNOTSUPP; 1427} 1428 1429int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1430 size_t len, int flags) 1431{ 1432 return -EOPNOTSUPP; 1433} 1434 1435int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1436{ 1437 /* Mirror missing mmap method error code */ 1438 return -ENODEV; 1439} 1440 1441ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1442{ 1443 ssize_t res; 1444 struct msghdr msg = {.msg_flags = flags}; 1445 struct kvec iov; 1446 char *kaddr = kmap(page); 1447 iov.iov_base = kaddr + offset; 1448 iov.iov_len = size; 1449 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1450 kunmap(page); 1451 return res; 1452} 1453 1454/* 1455 * Default Socket Callbacks 1456 */ 1457 1458static void sock_def_wakeup(struct sock *sk) 1459{ 1460 read_lock(&sk->sk_callback_lock); 1461 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1462 wake_up_interruptible_all(sk->sk_sleep); 1463 read_unlock(&sk->sk_callback_lock); 1464} 1465 1466static void sock_def_error_report(struct sock *sk) 1467{ 1468 read_lock(&sk->sk_callback_lock); 1469 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1470 wake_up_interruptible(sk->sk_sleep); 1471 sk_wake_async(sk,0,POLL_ERR); 1472 read_unlock(&sk->sk_callback_lock); 1473} 1474 1475static void sock_def_readable(struct sock *sk, int len) 1476{ 1477 read_lock(&sk->sk_callback_lock); 1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1479 wake_up_interruptible(sk->sk_sleep); 1480 sk_wake_async(sk,1,POLL_IN); 1481 read_unlock(&sk->sk_callback_lock); 1482} 1483 1484static void sock_def_write_space(struct sock *sk) 1485{ 1486 read_lock(&sk->sk_callback_lock); 1487 1488 /* Do not wake up a writer until he can make "significant" 1489 * progress. --DaveM 1490 */ 1491 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1492 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1493 wake_up_interruptible(sk->sk_sleep); 1494 1495 /* Should agree with poll, otherwise some programs break */ 1496 if (sock_writeable(sk)) 1497 sk_wake_async(sk, 2, POLL_OUT); 1498 } 1499 1500 read_unlock(&sk->sk_callback_lock); 1501} 1502 1503static void sock_def_destruct(struct sock *sk) 1504{ 1505 kfree(sk->sk_protinfo); 1506} 1507 1508void sk_send_sigurg(struct sock *sk) 1509{ 1510 if (sk->sk_socket && sk->sk_socket->file) 1511 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1512 sk_wake_async(sk, 3, POLL_PRI); 1513} 1514 1515void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1516 unsigned long expires) 1517{ 1518 if (!mod_timer(timer, expires)) 1519 sock_hold(sk); 1520} 1521 1522EXPORT_SYMBOL(sk_reset_timer); 1523 1524void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1525{ 1526 if (timer_pending(timer) && del_timer(timer)) 1527 __sock_put(sk); 1528} 1529 1530EXPORT_SYMBOL(sk_stop_timer); 1531 1532void sock_init_data(struct socket *sock, struct sock *sk) 1533{ 1534 skb_queue_head_init(&sk->sk_receive_queue); 1535 skb_queue_head_init(&sk->sk_write_queue); 1536 skb_queue_head_init(&sk->sk_error_queue); 1537#ifdef CONFIG_NET_DMA 1538 skb_queue_head_init(&sk->sk_async_wait_queue); 1539#endif 1540 1541 sk->sk_send_head = NULL; 1542 1543 init_timer(&sk->sk_timer); 1544 1545 sk->sk_allocation = GFP_KERNEL; 1546 sk->sk_rcvbuf = sysctl_rmem_default; 1547 sk->sk_sndbuf = sysctl_wmem_default; 1548 sk->sk_state = TCP_CLOSE; 1549 sk->sk_socket = sock; 1550 1551 sock_set_flag(sk, SOCK_ZAPPED); 1552 1553 if (sock) { 1554 sk->sk_type = sock->type; 1555 sk->sk_sleep = &sock->wait; 1556 sock->sk = sk; 1557 } else 1558 sk->sk_sleep = NULL; 1559 1560 rwlock_init(&sk->sk_dst_lock); 1561 rwlock_init(&sk->sk_callback_lock); 1562 lockdep_set_class_and_name(&sk->sk_callback_lock, 1563 af_callback_keys + sk->sk_family, 1564 af_family_clock_key_strings[sk->sk_family]); 1565 1566 sk->sk_state_change = sock_def_wakeup; 1567 sk->sk_data_ready = sock_def_readable; 1568 sk->sk_write_space = sock_def_write_space; 1569 sk->sk_error_report = sock_def_error_report; 1570 sk->sk_destruct = sock_def_destruct; 1571 1572 sk->sk_sndmsg_page = NULL; 1573 sk->sk_sndmsg_off = 0; 1574 1575 sk->sk_peercred.pid = 0; 1576 sk->sk_peercred.uid = -1; 1577 sk->sk_peercred.gid = -1; 1578 sk->sk_write_pending = 0; 1579 sk->sk_rcvlowat = 1; 1580 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1581 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1582 1583 sk->sk_stamp = ktime_set(-1L, -1L); 1584 1585 atomic_set(&sk->sk_refcnt, 1); 1586} 1587 1588void fastcall lock_sock_nested(struct sock *sk, int subclass) 1589{ 1590 might_sleep(); 1591 spin_lock_bh(&sk->sk_lock.slock); 1592 if (sk->sk_lock.owned) 1593 __lock_sock(sk); 1594 sk->sk_lock.owned = 1; 1595 spin_unlock(&sk->sk_lock.slock); 1596 /* 1597 * The sk_lock has mutex_lock() semantics here: 1598 */ 1599 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1600 local_bh_enable(); 1601} 1602 1603EXPORT_SYMBOL(lock_sock_nested); 1604 1605void fastcall release_sock(struct sock *sk) 1606{ 1607 /* 1608 * The sk_lock has mutex_unlock() semantics: 1609 */ 1610 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1611 1612 spin_lock_bh(&sk->sk_lock.slock); 1613 if (sk->sk_backlog.tail) 1614 __release_sock(sk); 1615 sk->sk_lock.owned = 0; 1616 if (waitqueue_active(&sk->sk_lock.wq)) 1617 wake_up(&sk->sk_lock.wq); 1618 spin_unlock_bh(&sk->sk_lock.slock); 1619} 1620EXPORT_SYMBOL(release_sock); 1621 1622int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1623{ 1624 struct timeval tv; 1625 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1626 sock_enable_timestamp(sk); 1627 tv = ktime_to_timeval(sk->sk_stamp); 1628 if (tv.tv_sec == -1) 1629 return -ENOENT; 1630 if (tv.tv_sec == 0) { 1631 sk->sk_stamp = ktime_get_real(); 1632 tv = ktime_to_timeval(sk->sk_stamp); 1633 } 1634 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1635} 1636EXPORT_SYMBOL(sock_get_timestamp); 1637 1638int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1639{ 1640 struct timespec ts; 1641 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1642 sock_enable_timestamp(sk); 1643 ts = ktime_to_timespec(sk->sk_stamp); 1644 if (ts.tv_sec == -1) 1645 return -ENOENT; 1646 if (ts.tv_sec == 0) { 1647 sk->sk_stamp = ktime_get_real(); 1648 ts = ktime_to_timespec(sk->sk_stamp); 1649 } 1650 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1651} 1652EXPORT_SYMBOL(sock_get_timestampns); 1653 1654void sock_enable_timestamp(struct sock *sk) 1655{ 1656 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1657 sock_set_flag(sk, SOCK_TIMESTAMP); 1658 net_enable_timestamp(); 1659 } 1660} 1661EXPORT_SYMBOL(sock_enable_timestamp); 1662 1663/* 1664 * Get a socket option on an socket. 1665 * 1666 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1667 * asynchronous errors should be reported by getsockopt. We assume 1668 * this means if you specify SO_ERROR (otherwise whats the point of it). 1669 */ 1670int sock_common_getsockopt(struct socket *sock, int level, int optname, 1671 char __user *optval, int __user *optlen) 1672{ 1673 struct sock *sk = sock->sk; 1674 1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1676} 1677 1678EXPORT_SYMBOL(sock_common_getsockopt); 1679 1680#ifdef CONFIG_COMPAT 1681int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1682 char __user *optval, int __user *optlen) 1683{ 1684 struct sock *sk = sock->sk; 1685 1686 if (sk->sk_prot->compat_getsockopt != NULL) 1687 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1688 optval, optlen); 1689 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1690} 1691EXPORT_SYMBOL(compat_sock_common_getsockopt); 1692#endif 1693 1694int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1695 struct msghdr *msg, size_t size, int flags) 1696{ 1697 struct sock *sk = sock->sk; 1698 int addr_len = 0; 1699 int err; 1700 1701 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1702 flags & ~MSG_DONTWAIT, &addr_len); 1703 if (err >= 0) 1704 msg->msg_namelen = addr_len; 1705 return err; 1706} 1707 1708EXPORT_SYMBOL(sock_common_recvmsg); 1709 1710/* 1711 * Set socket options on an inet socket. 1712 */ 1713int sock_common_setsockopt(struct socket *sock, int level, int optname, 1714 char __user *optval, int optlen) 1715{ 1716 struct sock *sk = sock->sk; 1717 1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1719} 1720 1721EXPORT_SYMBOL(sock_common_setsockopt); 1722 1723#ifdef CONFIG_COMPAT 1724int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1725 char __user *optval, int optlen) 1726{ 1727 struct sock *sk = sock->sk; 1728 1729 if (sk->sk_prot->compat_setsockopt != NULL) 1730 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1731 optval, optlen); 1732 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1733} 1734EXPORT_SYMBOL(compat_sock_common_setsockopt); 1735#endif 1736 1737void sk_common_release(struct sock *sk) 1738{ 1739 if (sk->sk_prot->destroy) 1740 sk->sk_prot->destroy(sk); 1741 1742 /* 1743 * Observation: when sock_common_release is called, processes have 1744 * no access to socket. But net still has. 1745 * Step one, detach it from networking: 1746 * 1747 * A. Remove from hash tables. 1748 */ 1749 1750 sk->sk_prot->unhash(sk); 1751 1752 /* 1753 * In this point socket cannot receive new packets, but it is possible 1754 * that some packets are in flight because some CPU runs receiver and 1755 * did hash table lookup before we unhashed socket. They will achieve 1756 * receive queue and will be purged by socket destructor. 1757 * 1758 * Also we still have packets pending on receive queue and probably, 1759 * our own packets waiting in device queues. sock_destroy will drain 1760 * receive queue, but transmitted packets will delay socket destruction 1761 * until the last reference will be released. 1762 */ 1763 1764 sock_orphan(sk); 1765 1766 xfrm_sk_free_policy(sk); 1767 1768 sk_refcnt_debug_release(sk); 1769 sock_put(sk); 1770} 1771 1772EXPORT_SYMBOL(sk_common_release); 1773 1774static DEFINE_RWLOCK(proto_list_lock); 1775static LIST_HEAD(proto_list); 1776 1777int proto_register(struct proto *prot, int alloc_slab) 1778{ 1779 char *request_sock_slab_name = NULL; 1780 char *timewait_sock_slab_name; 1781 int rc = -ENOBUFS; 1782 1783 if (alloc_slab) { 1784 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1785 SLAB_HWCACHE_ALIGN, NULL); 1786 1787 if (prot->slab == NULL) { 1788 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1789 prot->name); 1790 goto out; 1791 } 1792 1793 if (prot->rsk_prot != NULL) { 1794 static const char mask[] = "request_sock_%s"; 1795 1796 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1797 if (request_sock_slab_name == NULL) 1798 goto out_free_sock_slab; 1799 1800 sprintf(request_sock_slab_name, mask, prot->name); 1801 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1802 prot->rsk_prot->obj_size, 0, 1803 SLAB_HWCACHE_ALIGN, NULL); 1804 1805 if (prot->rsk_prot->slab == NULL) { 1806 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1807 prot->name); 1808 goto out_free_request_sock_slab_name; 1809 } 1810 } 1811 1812 if (prot->twsk_prot != NULL) { 1813 static const char mask[] = "tw_sock_%s"; 1814 1815 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1816 1817 if (timewait_sock_slab_name == NULL) 1818 goto out_free_request_sock_slab; 1819 1820 sprintf(timewait_sock_slab_name, mask, prot->name); 1821 prot->twsk_prot->twsk_slab = 1822 kmem_cache_create(timewait_sock_slab_name, 1823 prot->twsk_prot->twsk_obj_size, 1824 0, SLAB_HWCACHE_ALIGN, 1825 NULL); 1826 if (prot->twsk_prot->twsk_slab == NULL) 1827 goto out_free_timewait_sock_slab_name; 1828 } 1829 } 1830 1831 write_lock(&proto_list_lock); 1832 list_add(&prot->node, &proto_list); 1833 write_unlock(&proto_list_lock); 1834 rc = 0; 1835out: 1836 return rc; 1837out_free_timewait_sock_slab_name: 1838 kfree(timewait_sock_slab_name); 1839out_free_request_sock_slab: 1840 if (prot->rsk_prot && prot->rsk_prot->slab) { 1841 kmem_cache_destroy(prot->rsk_prot->slab); 1842 prot->rsk_prot->slab = NULL; 1843 } 1844out_free_request_sock_slab_name: 1845 kfree(request_sock_slab_name); 1846out_free_sock_slab: 1847 kmem_cache_destroy(prot->slab); 1848 prot->slab = NULL; 1849 goto out; 1850} 1851 1852EXPORT_SYMBOL(proto_register); 1853 1854void proto_unregister(struct proto *prot) 1855{ 1856 write_lock(&proto_list_lock); 1857 list_del(&prot->node); 1858 write_unlock(&proto_list_lock); 1859 1860 if (prot->slab != NULL) { 1861 kmem_cache_destroy(prot->slab); 1862 prot->slab = NULL; 1863 } 1864 1865 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1866 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1867 1868 kmem_cache_destroy(prot->rsk_prot->slab); 1869 kfree(name); 1870 prot->rsk_prot->slab = NULL; 1871 } 1872 1873 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1874 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1875 1876 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1877 kfree(name); 1878 prot->twsk_prot->twsk_slab = NULL; 1879 } 1880} 1881 1882EXPORT_SYMBOL(proto_unregister); 1883 1884#ifdef CONFIG_PROC_FS 1885static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1886{ 1887 read_lock(&proto_list_lock); 1888 return seq_list_start_head(&proto_list, *pos); 1889} 1890 1891static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1892{ 1893 return seq_list_next(v, &proto_list, pos); 1894} 1895 1896static void proto_seq_stop(struct seq_file *seq, void *v) 1897{ 1898 read_unlock(&proto_list_lock); 1899} 1900 1901static char proto_method_implemented(const void *method) 1902{ 1903 return method == NULL ? 'n' : 'y'; 1904} 1905 1906static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1907{ 1908 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1909 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1910 proto->name, 1911 proto->obj_size, 1912 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1913 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1914 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1915 proto->max_header, 1916 proto->slab == NULL ? "no" : "yes", 1917 module_name(proto->owner), 1918 proto_method_implemented(proto->close), 1919 proto_method_implemented(proto->connect), 1920 proto_method_implemented(proto->disconnect), 1921 proto_method_implemented(proto->accept), 1922 proto_method_implemented(proto->ioctl), 1923 proto_method_implemented(proto->init), 1924 proto_method_implemented(proto->destroy), 1925 proto_method_implemented(proto->shutdown), 1926 proto_method_implemented(proto->setsockopt), 1927 proto_method_implemented(proto->getsockopt), 1928 proto_method_implemented(proto->sendmsg), 1929 proto_method_implemented(proto->recvmsg), 1930 proto_method_implemented(proto->sendpage), 1931 proto_method_implemented(proto->bind), 1932 proto_method_implemented(proto->backlog_rcv), 1933 proto_method_implemented(proto->hash), 1934 proto_method_implemented(proto->unhash), 1935 proto_method_implemented(proto->get_port), 1936 proto_method_implemented(proto->enter_memory_pressure)); 1937} 1938 1939static int proto_seq_show(struct seq_file *seq, void *v) 1940{ 1941 if (v == &proto_list) 1942 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1943 "protocol", 1944 "size", 1945 "sockets", 1946 "memory", 1947 "press", 1948 "maxhdr", 1949 "slab", 1950 "module", 1951 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1952 else 1953 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1954 return 0; 1955} 1956 1957static const struct seq_operations proto_seq_ops = { 1958 .start = proto_seq_start, 1959 .next = proto_seq_next, 1960 .stop = proto_seq_stop, 1961 .show = proto_seq_show, 1962}; 1963 1964static int proto_seq_open(struct inode *inode, struct file *file) 1965{ 1966 return seq_open(file, &proto_seq_ops); 1967} 1968 1969static const struct file_operations proto_seq_fops = { 1970 .owner = THIS_MODULE, 1971 .open = proto_seq_open, 1972 .read = seq_read, 1973 .llseek = seq_lseek, 1974 .release = seq_release, 1975}; 1976 1977static int __init proto_init(void) 1978{ 1979 /* register /proc/net/protocols */ 1980 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1981} 1982 1983subsys_initcall(proto_init); 1984 1985#endif /* PROC_FS */ 1986 1987EXPORT_SYMBOL(sk_alloc); 1988EXPORT_SYMBOL(sk_free); 1989EXPORT_SYMBOL(sk_send_sigurg); 1990EXPORT_SYMBOL(sock_alloc_send_skb); 1991EXPORT_SYMBOL(sock_init_data); 1992EXPORT_SYMBOL(sock_kfree_s); 1993EXPORT_SYMBOL(sock_kmalloc); 1994EXPORT_SYMBOL(sock_no_accept); 1995EXPORT_SYMBOL(sock_no_bind); 1996EXPORT_SYMBOL(sock_no_connect); 1997EXPORT_SYMBOL(sock_no_getname); 1998EXPORT_SYMBOL(sock_no_getsockopt); 1999EXPORT_SYMBOL(sock_no_ioctl); 2000EXPORT_SYMBOL(sock_no_listen); 2001EXPORT_SYMBOL(sock_no_mmap); 2002EXPORT_SYMBOL(sock_no_poll); 2003EXPORT_SYMBOL(sock_no_recvmsg); 2004EXPORT_SYMBOL(sock_no_sendmsg); 2005EXPORT_SYMBOL(sock_no_sendpage); 2006EXPORT_SYMBOL(sock_no_setsockopt); 2007EXPORT_SYMBOL(sock_no_shutdown); 2008EXPORT_SYMBOL(sock_no_socketpair); 2009EXPORT_SYMBOL(sock_rfree); 2010EXPORT_SYMBOL(sock_setsockopt); 2011EXPORT_SYMBOL(sock_wfree); 2012EXPORT_SYMBOL(sock_wmalloc); 2013EXPORT_SYMBOL(sock_i_uid); 2014EXPORT_SYMBOL(sock_i_ino); 2015EXPORT_SYMBOL(sysctl_optmem_max); 2016#ifdef CONFIG_SYSCTL 2017EXPORT_SYMBOL(sysctl_rmem_max); 2018EXPORT_SYMBOL(sysctl_wmem_max); 2019#endif 2020