sock.c revision c308c1b20e2eb7b13f200a7c18b3f23561318367
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, task_pid_nr(current)); 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 int val; 432 int valbool; 433 struct linger ling; 434 int ret = 0; 435 436 /* 437 * Options without arguments 438 */ 439 440#ifdef SO_DONTLINGER /* Compatibility item... */ 441 if (optname == SO_DONTLINGER) { 442 lock_sock(sk); 443 sock_reset_flag(sk, SOCK_LINGER); 444 release_sock(sk); 445 return 0; 446 } 447#endif 448 449 if (optname == SO_BINDTODEVICE) 450 return sock_bindtodevice(sk, optval, optlen); 451 452 if (optlen < sizeof(int)) 453 return -EINVAL; 454 455 if (get_user(val, (int __user *)optval)) 456 return -EFAULT; 457 458 valbool = val?1:0; 459 460 lock_sock(sk); 461 462 switch(optname) { 463 case SO_DEBUG: 464 if (val && !capable(CAP_NET_ADMIN)) { 465 ret = -EACCES; 466 } 467 else if (valbool) 468 sock_set_flag(sk, SOCK_DBG); 469 else 470 sock_reset_flag(sk, SOCK_DBG); 471 break; 472 case SO_REUSEADDR: 473 sk->sk_reuse = valbool; 474 break; 475 case SO_TYPE: 476 case SO_ERROR: 477 ret = -ENOPROTOOPT; 478 break; 479 case SO_DONTROUTE: 480 if (valbool) 481 sock_set_flag(sk, SOCK_LOCALROUTE); 482 else 483 sock_reset_flag(sk, SOCK_LOCALROUTE); 484 break; 485 case SO_BROADCAST: 486 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 487 break; 488 case SO_SNDBUF: 489 /* Don't error on this BSD doesn't and if you think 490 about it this is right. Otherwise apps have to 491 play 'guess the biggest size' games. RCVBUF/SNDBUF 492 are treated in BSD as hints */ 493 494 if (val > sysctl_wmem_max) 495 val = sysctl_wmem_max; 496set_sndbuf: 497 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 498 if ((val * 2) < SOCK_MIN_SNDBUF) 499 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 500 else 501 sk->sk_sndbuf = val * 2; 502 503 /* 504 * Wake up sending tasks if we 505 * upped the value. 506 */ 507 sk->sk_write_space(sk); 508 break; 509 510 case SO_SNDBUFFORCE: 511 if (!capable(CAP_NET_ADMIN)) { 512 ret = -EPERM; 513 break; 514 } 515 goto set_sndbuf; 516 517 case SO_RCVBUF: 518 /* Don't error on this BSD doesn't and if you think 519 about it this is right. Otherwise apps have to 520 play 'guess the biggest size' games. RCVBUF/SNDBUF 521 are treated in BSD as hints */ 522 523 if (val > sysctl_rmem_max) 524 val = sysctl_rmem_max; 525set_rcvbuf: 526 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 527 /* 528 * We double it on the way in to account for 529 * "struct sk_buff" etc. overhead. Applications 530 * assume that the SO_RCVBUF setting they make will 531 * allow that much actual data to be received on that 532 * socket. 533 * 534 * Applications are unaware that "struct sk_buff" and 535 * other overheads allocate from the receive buffer 536 * during socket buffer allocation. 537 * 538 * And after considering the possible alternatives, 539 * returning the value we actually used in getsockopt 540 * is the most desirable behavior. 541 */ 542 if ((val * 2) < SOCK_MIN_RCVBUF) 543 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 544 else 545 sk->sk_rcvbuf = val * 2; 546 break; 547 548 case SO_RCVBUFFORCE: 549 if (!capable(CAP_NET_ADMIN)) { 550 ret = -EPERM; 551 break; 552 } 553 goto set_rcvbuf; 554 555 case SO_KEEPALIVE: 556#ifdef CONFIG_INET 557 if (sk->sk_protocol == IPPROTO_TCP) 558 tcp_set_keepalive(sk, valbool); 559#endif 560 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 561 break; 562 563 case SO_OOBINLINE: 564 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 565 break; 566 567 case SO_NO_CHECK: 568 sk->sk_no_check = valbool; 569 break; 570 571 case SO_PRIORITY: 572 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 573 sk->sk_priority = val; 574 else 575 ret = -EPERM; 576 break; 577 578 case SO_LINGER: 579 if (optlen < sizeof(ling)) { 580 ret = -EINVAL; /* 1003.1g */ 581 break; 582 } 583 if (copy_from_user(&ling,optval,sizeof(ling))) { 584 ret = -EFAULT; 585 break; 586 } 587 if (!ling.l_onoff) 588 sock_reset_flag(sk, SOCK_LINGER); 589 else { 590#if (BITS_PER_LONG == 32) 591 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 592 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 593 else 594#endif 595 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 596 sock_set_flag(sk, SOCK_LINGER); 597 } 598 break; 599 600 case SO_BSDCOMPAT: 601 sock_warn_obsolete_bsdism("setsockopt"); 602 break; 603 604 case SO_PASSCRED: 605 if (valbool) 606 set_bit(SOCK_PASSCRED, &sock->flags); 607 else 608 clear_bit(SOCK_PASSCRED, &sock->flags); 609 break; 610 611 case SO_TIMESTAMP: 612 case SO_TIMESTAMPNS: 613 if (valbool) { 614 if (optname == SO_TIMESTAMP) 615 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 616 else 617 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 618 sock_set_flag(sk, SOCK_RCVTSTAMP); 619 sock_enable_timestamp(sk); 620 } else { 621 sock_reset_flag(sk, SOCK_RCVTSTAMP); 622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 623 } 624 break; 625 626 case SO_RCVLOWAT: 627 if (val < 0) 628 val = INT_MAX; 629 sk->sk_rcvlowat = val ? : 1; 630 break; 631 632 case SO_RCVTIMEO: 633 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 634 break; 635 636 case SO_SNDTIMEO: 637 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 638 break; 639 640 case SO_ATTACH_FILTER: 641 ret = -EINVAL; 642 if (optlen == sizeof(struct sock_fprog)) { 643 struct sock_fprog fprog; 644 645 ret = -EFAULT; 646 if (copy_from_user(&fprog, optval, sizeof(fprog))) 647 break; 648 649 ret = sk_attach_filter(&fprog, sk); 650 } 651 break; 652 653 case SO_DETACH_FILTER: 654 ret = sk_detach_filter(sk); 655 break; 656 657 case SO_PASSSEC: 658 if (valbool) 659 set_bit(SOCK_PASSSEC, &sock->flags); 660 else 661 clear_bit(SOCK_PASSSEC, &sock->flags); 662 break; 663 664 /* We implement the SO_SNDLOWAT etc to 665 not be settable (1003.1g 5.3) */ 666 default: 667 ret = -ENOPROTOOPT; 668 break; 669 } 670 release_sock(sk); 671 return ret; 672} 673 674 675int sock_getsockopt(struct socket *sock, int level, int optname, 676 char __user *optval, int __user *optlen) 677{ 678 struct sock *sk = sock->sk; 679 680 union { 681 int val; 682 struct linger ling; 683 struct timeval tm; 684 } v; 685 686 unsigned int lv = sizeof(int); 687 int len; 688 689 if (get_user(len, optlen)) 690 return -EFAULT; 691 if (len < 0) 692 return -EINVAL; 693 694 switch(optname) { 695 case SO_DEBUG: 696 v.val = sock_flag(sk, SOCK_DBG); 697 break; 698 699 case SO_DONTROUTE: 700 v.val = sock_flag(sk, SOCK_LOCALROUTE); 701 break; 702 703 case SO_BROADCAST: 704 v.val = !!sock_flag(sk, SOCK_BROADCAST); 705 break; 706 707 case SO_SNDBUF: 708 v.val = sk->sk_sndbuf; 709 break; 710 711 case SO_RCVBUF: 712 v.val = sk->sk_rcvbuf; 713 break; 714 715 case SO_REUSEADDR: 716 v.val = sk->sk_reuse; 717 break; 718 719 case SO_KEEPALIVE: 720 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 721 break; 722 723 case SO_TYPE: 724 v.val = sk->sk_type; 725 break; 726 727 case SO_ERROR: 728 v.val = -sock_error(sk); 729 if (v.val==0) 730 v.val = xchg(&sk->sk_err_soft, 0); 731 break; 732 733 case SO_OOBINLINE: 734 v.val = !!sock_flag(sk, SOCK_URGINLINE); 735 break; 736 737 case SO_NO_CHECK: 738 v.val = sk->sk_no_check; 739 break; 740 741 case SO_PRIORITY: 742 v.val = sk->sk_priority; 743 break; 744 745 case SO_LINGER: 746 lv = sizeof(v.ling); 747 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 748 v.ling.l_linger = sk->sk_lingertime / HZ; 749 break; 750 751 case SO_BSDCOMPAT: 752 sock_warn_obsolete_bsdism("getsockopt"); 753 break; 754 755 case SO_TIMESTAMP: 756 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 757 !sock_flag(sk, SOCK_RCVTSTAMPNS); 758 break; 759 760 case SO_TIMESTAMPNS: 761 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 762 break; 763 764 case SO_RCVTIMEO: 765 lv=sizeof(struct timeval); 766 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 767 v.tm.tv_sec = 0; 768 v.tm.tv_usec = 0; 769 } else { 770 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 771 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 772 } 773 break; 774 775 case SO_SNDTIMEO: 776 lv=sizeof(struct timeval); 777 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 778 v.tm.tv_sec = 0; 779 v.tm.tv_usec = 0; 780 } else { 781 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 782 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 783 } 784 break; 785 786 case SO_RCVLOWAT: 787 v.val = sk->sk_rcvlowat; 788 break; 789 790 case SO_SNDLOWAT: 791 v.val=1; 792 break; 793 794 case SO_PASSCRED: 795 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 796 break; 797 798 case SO_PEERCRED: 799 if (len > sizeof(sk->sk_peercred)) 800 len = sizeof(sk->sk_peercred); 801 if (copy_to_user(optval, &sk->sk_peercred, len)) 802 return -EFAULT; 803 goto lenout; 804 805 case SO_PEERNAME: 806 { 807 char address[128]; 808 809 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 810 return -ENOTCONN; 811 if (lv < len) 812 return -EINVAL; 813 if (copy_to_user(optval, address, len)) 814 return -EFAULT; 815 goto lenout; 816 } 817 818 /* Dubious BSD thing... Probably nobody even uses it, but 819 * the UNIX standard wants it for whatever reason... -DaveM 820 */ 821 case SO_ACCEPTCONN: 822 v.val = sk->sk_state == TCP_LISTEN; 823 break; 824 825 case SO_PASSSEC: 826 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 827 break; 828 829 case SO_PEERSEC: 830 return security_socket_getpeersec_stream(sock, optval, optlen, len); 831 832 default: 833 return -ENOPROTOOPT; 834 } 835 836 if (len > lv) 837 len = lv; 838 if (copy_to_user(optval, &v, len)) 839 return -EFAULT; 840lenout: 841 if (put_user(len, optlen)) 842 return -EFAULT; 843 return 0; 844} 845 846/* 847 * Initialize an sk_lock. 848 * 849 * (We also register the sk_lock with the lock validator.) 850 */ 851static inline void sock_lock_init(struct sock *sk) 852{ 853 sock_lock_init_class_and_name(sk, 854 af_family_slock_key_strings[sk->sk_family], 855 af_family_slock_keys + sk->sk_family, 856 af_family_key_strings[sk->sk_family], 857 af_family_keys + sk->sk_family); 858} 859 860static void sock_copy(struct sock *nsk, const struct sock *osk) 861{ 862#ifdef CONFIG_SECURITY_NETWORK 863 void *sptr = nsk->sk_security; 864#endif 865 866 memcpy(nsk, osk, osk->sk_prot->obj_size); 867#ifdef CONFIG_SECURITY_NETWORK 868 nsk->sk_security = sptr; 869 security_sk_clone(osk, nsk); 870#endif 871} 872 873static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority) 874{ 875 struct sock *sk; 876 struct kmem_cache *slab; 877 878 slab = prot->slab; 879 if (slab != NULL) 880 sk = kmem_cache_alloc(slab, priority); 881 else 882 sk = kmalloc(prot->obj_size, priority); 883 884 return sk; 885} 886 887static void sk_prot_free(struct proto *prot, struct sock *sk) 888{ 889 struct kmem_cache *slab; 890 891 slab = prot->slab; 892 if (slab != NULL) 893 kmem_cache_free(slab, sk); 894 else 895 kfree(sk); 896} 897 898/** 899 * sk_alloc - All socket objects are allocated here 900 * @net: the applicable net namespace 901 * @family: protocol family 902 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 903 * @prot: struct proto associated with this new sock instance 904 * @zero_it: if we should zero the newly allocated sock 905 */ 906struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 907 struct proto *prot, int zero_it) 908{ 909 struct sock *sk; 910 911 sk = sk_prot_alloc(prot, priority); 912 if (sk) { 913 if (zero_it) { 914 memset(sk, 0, prot->obj_size); 915 sk->sk_family = family; 916 /* 917 * See comment in struct sock definition to understand 918 * why we need sk_prot_creator -acme 919 */ 920 sk->sk_prot = sk->sk_prot_creator = prot; 921 sock_lock_init(sk); 922 sk->sk_net = get_net(net); 923 } 924 925 if (security_sk_alloc(sk, family, priority)) 926 goto out_free; 927 928 if (!try_module_get(prot->owner)) 929 goto out_free; 930 } 931 return sk; 932 933out_free: 934 sk_prot_free(prot, sk); 935 return NULL; 936} 937 938void sk_free(struct sock *sk) 939{ 940 struct sk_filter *filter; 941 struct module *owner = sk->sk_prot_creator->owner; 942 943 if (sk->sk_destruct) 944 sk->sk_destruct(sk); 945 946 filter = rcu_dereference(sk->sk_filter); 947 if (filter) { 948 sk_filter_uncharge(sk, filter); 949 rcu_assign_pointer(sk->sk_filter, NULL); 950 } 951 952 sock_disable_timestamp(sk); 953 954 if (atomic_read(&sk->sk_omem_alloc)) 955 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 956 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 957 958 security_sk_free(sk); 959 put_net(sk->sk_net); 960 sk_prot_free(sk->sk_prot_creator, sk); 961 module_put(owner); 962} 963 964struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 965{ 966 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0); 967 968 if (newsk != NULL) { 969 struct sk_filter *filter; 970 971 sock_copy(newsk, sk); 972 973 /* SANITY */ 974 get_net(newsk->sk_net); 975 sk_node_init(&newsk->sk_node); 976 sock_lock_init(newsk); 977 bh_lock_sock(newsk); 978 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 979 980 atomic_set(&newsk->sk_rmem_alloc, 0); 981 atomic_set(&newsk->sk_wmem_alloc, 0); 982 atomic_set(&newsk->sk_omem_alloc, 0); 983 skb_queue_head_init(&newsk->sk_receive_queue); 984 skb_queue_head_init(&newsk->sk_write_queue); 985#ifdef CONFIG_NET_DMA 986 skb_queue_head_init(&newsk->sk_async_wait_queue); 987#endif 988 989 rwlock_init(&newsk->sk_dst_lock); 990 rwlock_init(&newsk->sk_callback_lock); 991 lockdep_set_class_and_name(&newsk->sk_callback_lock, 992 af_callback_keys + newsk->sk_family, 993 af_family_clock_key_strings[newsk->sk_family]); 994 995 newsk->sk_dst_cache = NULL; 996 newsk->sk_wmem_queued = 0; 997 newsk->sk_forward_alloc = 0; 998 newsk->sk_send_head = NULL; 999 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1000 1001 sock_reset_flag(newsk, SOCK_DONE); 1002 skb_queue_head_init(&newsk->sk_error_queue); 1003 1004 filter = newsk->sk_filter; 1005 if (filter != NULL) 1006 sk_filter_charge(newsk, filter); 1007 1008 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1009 /* It is still raw copy of parent, so invalidate 1010 * destructor and make plain sk_free() */ 1011 newsk->sk_destruct = NULL; 1012 sk_free(newsk); 1013 newsk = NULL; 1014 goto out; 1015 } 1016 1017 newsk->sk_err = 0; 1018 newsk->sk_priority = 0; 1019 atomic_set(&newsk->sk_refcnt, 2); 1020 1021 /* 1022 * Increment the counter in the same struct proto as the master 1023 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1024 * is the same as sk->sk_prot->socks, as this field was copied 1025 * with memcpy). 1026 * 1027 * This _changes_ the previous behaviour, where 1028 * tcp_create_openreq_child always was incrementing the 1029 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1030 * to be taken into account in all callers. -acme 1031 */ 1032 sk_refcnt_debug_inc(newsk); 1033 newsk->sk_socket = NULL; 1034 newsk->sk_sleep = NULL; 1035 1036 if (newsk->sk_prot->sockets_allocated) 1037 atomic_inc(newsk->sk_prot->sockets_allocated); 1038 } 1039out: 1040 return newsk; 1041} 1042 1043EXPORT_SYMBOL_GPL(sk_clone); 1044 1045void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1046{ 1047 __sk_dst_set(sk, dst); 1048 sk->sk_route_caps = dst->dev->features; 1049 if (sk->sk_route_caps & NETIF_F_GSO) 1050 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1051 if (sk_can_gso(sk)) { 1052 if (dst->header_len) 1053 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1054 else 1055 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1056 } 1057} 1058EXPORT_SYMBOL_GPL(sk_setup_caps); 1059 1060void __init sk_init(void) 1061{ 1062 if (num_physpages <= 4096) { 1063 sysctl_wmem_max = 32767; 1064 sysctl_rmem_max = 32767; 1065 sysctl_wmem_default = 32767; 1066 sysctl_rmem_default = 32767; 1067 } else if (num_physpages >= 131072) { 1068 sysctl_wmem_max = 131071; 1069 sysctl_rmem_max = 131071; 1070 } 1071} 1072 1073/* 1074 * Simple resource managers for sockets. 1075 */ 1076 1077 1078/* 1079 * Write buffer destructor automatically called from kfree_skb. 1080 */ 1081void sock_wfree(struct sk_buff *skb) 1082{ 1083 struct sock *sk = skb->sk; 1084 1085 /* In case it might be waiting for more memory. */ 1086 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1087 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1088 sk->sk_write_space(sk); 1089 sock_put(sk); 1090} 1091 1092/* 1093 * Read buffer destructor automatically called from kfree_skb. 1094 */ 1095void sock_rfree(struct sk_buff *skb) 1096{ 1097 struct sock *sk = skb->sk; 1098 1099 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1100} 1101 1102 1103int sock_i_uid(struct sock *sk) 1104{ 1105 int uid; 1106 1107 read_lock(&sk->sk_callback_lock); 1108 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1109 read_unlock(&sk->sk_callback_lock); 1110 return uid; 1111} 1112 1113unsigned long sock_i_ino(struct sock *sk) 1114{ 1115 unsigned long ino; 1116 1117 read_lock(&sk->sk_callback_lock); 1118 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1119 read_unlock(&sk->sk_callback_lock); 1120 return ino; 1121} 1122 1123/* 1124 * Allocate a skb from the socket's send buffer. 1125 */ 1126struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1127 gfp_t priority) 1128{ 1129 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1130 struct sk_buff * skb = alloc_skb(size, priority); 1131 if (skb) { 1132 skb_set_owner_w(skb, sk); 1133 return skb; 1134 } 1135 } 1136 return NULL; 1137} 1138 1139/* 1140 * Allocate a skb from the socket's receive buffer. 1141 */ 1142struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1143 gfp_t priority) 1144{ 1145 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1146 struct sk_buff *skb = alloc_skb(size, priority); 1147 if (skb) { 1148 skb_set_owner_r(skb, sk); 1149 return skb; 1150 } 1151 } 1152 return NULL; 1153} 1154 1155/* 1156 * Allocate a memory block from the socket's option memory buffer. 1157 */ 1158void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1159{ 1160 if ((unsigned)size <= sysctl_optmem_max && 1161 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1162 void *mem; 1163 /* First do the add, to avoid the race if kmalloc 1164 * might sleep. 1165 */ 1166 atomic_add(size, &sk->sk_omem_alloc); 1167 mem = kmalloc(size, priority); 1168 if (mem) 1169 return mem; 1170 atomic_sub(size, &sk->sk_omem_alloc); 1171 } 1172 return NULL; 1173} 1174 1175/* 1176 * Free an option memory block. 1177 */ 1178void sock_kfree_s(struct sock *sk, void *mem, int size) 1179{ 1180 kfree(mem); 1181 atomic_sub(size, &sk->sk_omem_alloc); 1182} 1183 1184/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1185 I think, these locks should be removed for datagram sockets. 1186 */ 1187static long sock_wait_for_wmem(struct sock * sk, long timeo) 1188{ 1189 DEFINE_WAIT(wait); 1190 1191 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1192 for (;;) { 1193 if (!timeo) 1194 break; 1195 if (signal_pending(current)) 1196 break; 1197 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1198 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1199 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1200 break; 1201 if (sk->sk_shutdown & SEND_SHUTDOWN) 1202 break; 1203 if (sk->sk_err) 1204 break; 1205 timeo = schedule_timeout(timeo); 1206 } 1207 finish_wait(sk->sk_sleep, &wait); 1208 return timeo; 1209} 1210 1211 1212/* 1213 * Generic send/receive buffer handlers 1214 */ 1215 1216static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1217 unsigned long header_len, 1218 unsigned long data_len, 1219 int noblock, int *errcode) 1220{ 1221 struct sk_buff *skb; 1222 gfp_t gfp_mask; 1223 long timeo; 1224 int err; 1225 1226 gfp_mask = sk->sk_allocation; 1227 if (gfp_mask & __GFP_WAIT) 1228 gfp_mask |= __GFP_REPEAT; 1229 1230 timeo = sock_sndtimeo(sk, noblock); 1231 while (1) { 1232 err = sock_error(sk); 1233 if (err != 0) 1234 goto failure; 1235 1236 err = -EPIPE; 1237 if (sk->sk_shutdown & SEND_SHUTDOWN) 1238 goto failure; 1239 1240 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1241 skb = alloc_skb(header_len, gfp_mask); 1242 if (skb) { 1243 int npages; 1244 int i; 1245 1246 /* No pages, we're done... */ 1247 if (!data_len) 1248 break; 1249 1250 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1251 skb->truesize += data_len; 1252 skb_shinfo(skb)->nr_frags = npages; 1253 for (i = 0; i < npages; i++) { 1254 struct page *page; 1255 skb_frag_t *frag; 1256 1257 page = alloc_pages(sk->sk_allocation, 0); 1258 if (!page) { 1259 err = -ENOBUFS; 1260 skb_shinfo(skb)->nr_frags = i; 1261 kfree_skb(skb); 1262 goto failure; 1263 } 1264 1265 frag = &skb_shinfo(skb)->frags[i]; 1266 frag->page = page; 1267 frag->page_offset = 0; 1268 frag->size = (data_len >= PAGE_SIZE ? 1269 PAGE_SIZE : 1270 data_len); 1271 data_len -= PAGE_SIZE; 1272 } 1273 1274 /* Full success... */ 1275 break; 1276 } 1277 err = -ENOBUFS; 1278 goto failure; 1279 } 1280 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1281 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1282 err = -EAGAIN; 1283 if (!timeo) 1284 goto failure; 1285 if (signal_pending(current)) 1286 goto interrupted; 1287 timeo = sock_wait_for_wmem(sk, timeo); 1288 } 1289 1290 skb_set_owner_w(skb, sk); 1291 return skb; 1292 1293interrupted: 1294 err = sock_intr_errno(timeo); 1295failure: 1296 *errcode = err; 1297 return NULL; 1298} 1299 1300struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1301 int noblock, int *errcode) 1302{ 1303 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1304} 1305 1306static void __lock_sock(struct sock *sk) 1307{ 1308 DEFINE_WAIT(wait); 1309 1310 for (;;) { 1311 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1312 TASK_UNINTERRUPTIBLE); 1313 spin_unlock_bh(&sk->sk_lock.slock); 1314 schedule(); 1315 spin_lock_bh(&sk->sk_lock.slock); 1316 if (!sock_owned_by_user(sk)) 1317 break; 1318 } 1319 finish_wait(&sk->sk_lock.wq, &wait); 1320} 1321 1322static void __release_sock(struct sock *sk) 1323{ 1324 struct sk_buff *skb = sk->sk_backlog.head; 1325 1326 do { 1327 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1328 bh_unlock_sock(sk); 1329 1330 do { 1331 struct sk_buff *next = skb->next; 1332 1333 skb->next = NULL; 1334 sk->sk_backlog_rcv(sk, skb); 1335 1336 /* 1337 * We are in process context here with softirqs 1338 * disabled, use cond_resched_softirq() to preempt. 1339 * This is safe to do because we've taken the backlog 1340 * queue private: 1341 */ 1342 cond_resched_softirq(); 1343 1344 skb = next; 1345 } while (skb != NULL); 1346 1347 bh_lock_sock(sk); 1348 } while ((skb = sk->sk_backlog.head) != NULL); 1349} 1350 1351/** 1352 * sk_wait_data - wait for data to arrive at sk_receive_queue 1353 * @sk: sock to wait on 1354 * @timeo: for how long 1355 * 1356 * Now socket state including sk->sk_err is changed only under lock, 1357 * hence we may omit checks after joining wait queue. 1358 * We check receive queue before schedule() only as optimization; 1359 * it is very likely that release_sock() added new data. 1360 */ 1361int sk_wait_data(struct sock *sk, long *timeo) 1362{ 1363 int rc; 1364 DEFINE_WAIT(wait); 1365 1366 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1367 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1368 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1369 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1370 finish_wait(sk->sk_sleep, &wait); 1371 return rc; 1372} 1373 1374EXPORT_SYMBOL(sk_wait_data); 1375 1376/* 1377 * Set of default routines for initialising struct proto_ops when 1378 * the protocol does not support a particular function. In certain 1379 * cases where it makes no sense for a protocol to have a "do nothing" 1380 * function, some default processing is provided. 1381 */ 1382 1383int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1384{ 1385 return -EOPNOTSUPP; 1386} 1387 1388int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1389 int len, int flags) 1390{ 1391 return -EOPNOTSUPP; 1392} 1393 1394int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1395{ 1396 return -EOPNOTSUPP; 1397} 1398 1399int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1400{ 1401 return -EOPNOTSUPP; 1402} 1403 1404int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1405 int *len, int peer) 1406{ 1407 return -EOPNOTSUPP; 1408} 1409 1410unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1411{ 1412 return 0; 1413} 1414 1415int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1416{ 1417 return -EOPNOTSUPP; 1418} 1419 1420int sock_no_listen(struct socket *sock, int backlog) 1421{ 1422 return -EOPNOTSUPP; 1423} 1424 1425int sock_no_shutdown(struct socket *sock, int how) 1426{ 1427 return -EOPNOTSUPP; 1428} 1429 1430int sock_no_setsockopt(struct socket *sock, int level, int optname, 1431 char __user *optval, int optlen) 1432{ 1433 return -EOPNOTSUPP; 1434} 1435 1436int sock_no_getsockopt(struct socket *sock, int level, int optname, 1437 char __user *optval, int __user *optlen) 1438{ 1439 return -EOPNOTSUPP; 1440} 1441 1442int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1443 size_t len) 1444{ 1445 return -EOPNOTSUPP; 1446} 1447 1448int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1449 size_t len, int flags) 1450{ 1451 return -EOPNOTSUPP; 1452} 1453 1454int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1455{ 1456 /* Mirror missing mmap method error code */ 1457 return -ENODEV; 1458} 1459 1460ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1461{ 1462 ssize_t res; 1463 struct msghdr msg = {.msg_flags = flags}; 1464 struct kvec iov; 1465 char *kaddr = kmap(page); 1466 iov.iov_base = kaddr + offset; 1467 iov.iov_len = size; 1468 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1469 kunmap(page); 1470 return res; 1471} 1472 1473/* 1474 * Default Socket Callbacks 1475 */ 1476 1477static void sock_def_wakeup(struct sock *sk) 1478{ 1479 read_lock(&sk->sk_callback_lock); 1480 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1481 wake_up_interruptible_all(sk->sk_sleep); 1482 read_unlock(&sk->sk_callback_lock); 1483} 1484 1485static void sock_def_error_report(struct sock *sk) 1486{ 1487 read_lock(&sk->sk_callback_lock); 1488 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1489 wake_up_interruptible(sk->sk_sleep); 1490 sk_wake_async(sk,0,POLL_ERR); 1491 read_unlock(&sk->sk_callback_lock); 1492} 1493 1494static void sock_def_readable(struct sock *sk, int len) 1495{ 1496 read_lock(&sk->sk_callback_lock); 1497 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1498 wake_up_interruptible(sk->sk_sleep); 1499 sk_wake_async(sk,1,POLL_IN); 1500 read_unlock(&sk->sk_callback_lock); 1501} 1502 1503static void sock_def_write_space(struct sock *sk) 1504{ 1505 read_lock(&sk->sk_callback_lock); 1506 1507 /* Do not wake up a writer until he can make "significant" 1508 * progress. --DaveM 1509 */ 1510 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1511 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1512 wake_up_interruptible(sk->sk_sleep); 1513 1514 /* Should agree with poll, otherwise some programs break */ 1515 if (sock_writeable(sk)) 1516 sk_wake_async(sk, 2, POLL_OUT); 1517 } 1518 1519 read_unlock(&sk->sk_callback_lock); 1520} 1521 1522static void sock_def_destruct(struct sock *sk) 1523{ 1524 kfree(sk->sk_protinfo); 1525} 1526 1527void sk_send_sigurg(struct sock *sk) 1528{ 1529 if (sk->sk_socket && sk->sk_socket->file) 1530 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1531 sk_wake_async(sk, 3, POLL_PRI); 1532} 1533 1534void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1535 unsigned long expires) 1536{ 1537 if (!mod_timer(timer, expires)) 1538 sock_hold(sk); 1539} 1540 1541EXPORT_SYMBOL(sk_reset_timer); 1542 1543void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1544{ 1545 if (timer_pending(timer) && del_timer(timer)) 1546 __sock_put(sk); 1547} 1548 1549EXPORT_SYMBOL(sk_stop_timer); 1550 1551void sock_init_data(struct socket *sock, struct sock *sk) 1552{ 1553 skb_queue_head_init(&sk->sk_receive_queue); 1554 skb_queue_head_init(&sk->sk_write_queue); 1555 skb_queue_head_init(&sk->sk_error_queue); 1556#ifdef CONFIG_NET_DMA 1557 skb_queue_head_init(&sk->sk_async_wait_queue); 1558#endif 1559 1560 sk->sk_send_head = NULL; 1561 1562 init_timer(&sk->sk_timer); 1563 1564 sk->sk_allocation = GFP_KERNEL; 1565 sk->sk_rcvbuf = sysctl_rmem_default; 1566 sk->sk_sndbuf = sysctl_wmem_default; 1567 sk->sk_state = TCP_CLOSE; 1568 sk->sk_socket = sock; 1569 1570 sock_set_flag(sk, SOCK_ZAPPED); 1571 1572 if (sock) { 1573 sk->sk_type = sock->type; 1574 sk->sk_sleep = &sock->wait; 1575 sock->sk = sk; 1576 } else 1577 sk->sk_sleep = NULL; 1578 1579 rwlock_init(&sk->sk_dst_lock); 1580 rwlock_init(&sk->sk_callback_lock); 1581 lockdep_set_class_and_name(&sk->sk_callback_lock, 1582 af_callback_keys + sk->sk_family, 1583 af_family_clock_key_strings[sk->sk_family]); 1584 1585 sk->sk_state_change = sock_def_wakeup; 1586 sk->sk_data_ready = sock_def_readable; 1587 sk->sk_write_space = sock_def_write_space; 1588 sk->sk_error_report = sock_def_error_report; 1589 sk->sk_destruct = sock_def_destruct; 1590 1591 sk->sk_sndmsg_page = NULL; 1592 sk->sk_sndmsg_off = 0; 1593 1594 sk->sk_peercred.pid = 0; 1595 sk->sk_peercred.uid = -1; 1596 sk->sk_peercred.gid = -1; 1597 sk->sk_write_pending = 0; 1598 sk->sk_rcvlowat = 1; 1599 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1600 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1601 1602 sk->sk_stamp = ktime_set(-1L, -1L); 1603 1604 atomic_set(&sk->sk_refcnt, 1); 1605} 1606 1607void fastcall lock_sock_nested(struct sock *sk, int subclass) 1608{ 1609 might_sleep(); 1610 spin_lock_bh(&sk->sk_lock.slock); 1611 if (sk->sk_lock.owned) 1612 __lock_sock(sk); 1613 sk->sk_lock.owned = 1; 1614 spin_unlock(&sk->sk_lock.slock); 1615 /* 1616 * The sk_lock has mutex_lock() semantics here: 1617 */ 1618 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1619 local_bh_enable(); 1620} 1621 1622EXPORT_SYMBOL(lock_sock_nested); 1623 1624void fastcall release_sock(struct sock *sk) 1625{ 1626 /* 1627 * The sk_lock has mutex_unlock() semantics: 1628 */ 1629 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1630 1631 spin_lock_bh(&sk->sk_lock.slock); 1632 if (sk->sk_backlog.tail) 1633 __release_sock(sk); 1634 sk->sk_lock.owned = 0; 1635 if (waitqueue_active(&sk->sk_lock.wq)) 1636 wake_up(&sk->sk_lock.wq); 1637 spin_unlock_bh(&sk->sk_lock.slock); 1638} 1639EXPORT_SYMBOL(release_sock); 1640 1641int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1642{ 1643 struct timeval tv; 1644 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1645 sock_enable_timestamp(sk); 1646 tv = ktime_to_timeval(sk->sk_stamp); 1647 if (tv.tv_sec == -1) 1648 return -ENOENT; 1649 if (tv.tv_sec == 0) { 1650 sk->sk_stamp = ktime_get_real(); 1651 tv = ktime_to_timeval(sk->sk_stamp); 1652 } 1653 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1654} 1655EXPORT_SYMBOL(sock_get_timestamp); 1656 1657int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1658{ 1659 struct timespec ts; 1660 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1661 sock_enable_timestamp(sk); 1662 ts = ktime_to_timespec(sk->sk_stamp); 1663 if (ts.tv_sec == -1) 1664 return -ENOENT; 1665 if (ts.tv_sec == 0) { 1666 sk->sk_stamp = ktime_get_real(); 1667 ts = ktime_to_timespec(sk->sk_stamp); 1668 } 1669 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1670} 1671EXPORT_SYMBOL(sock_get_timestampns); 1672 1673void sock_enable_timestamp(struct sock *sk) 1674{ 1675 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1676 sock_set_flag(sk, SOCK_TIMESTAMP); 1677 net_enable_timestamp(); 1678 } 1679} 1680 1681/* 1682 * Get a socket option on an socket. 1683 * 1684 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1685 * asynchronous errors should be reported by getsockopt. We assume 1686 * this means if you specify SO_ERROR (otherwise whats the point of it). 1687 */ 1688int sock_common_getsockopt(struct socket *sock, int level, int optname, 1689 char __user *optval, int __user *optlen) 1690{ 1691 struct sock *sk = sock->sk; 1692 1693 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1694} 1695 1696EXPORT_SYMBOL(sock_common_getsockopt); 1697 1698#ifdef CONFIG_COMPAT 1699int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1700 char __user *optval, int __user *optlen) 1701{ 1702 struct sock *sk = sock->sk; 1703 1704 if (sk->sk_prot->compat_getsockopt != NULL) 1705 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1706 optval, optlen); 1707 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1708} 1709EXPORT_SYMBOL(compat_sock_common_getsockopt); 1710#endif 1711 1712int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1713 struct msghdr *msg, size_t size, int flags) 1714{ 1715 struct sock *sk = sock->sk; 1716 int addr_len = 0; 1717 int err; 1718 1719 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1720 flags & ~MSG_DONTWAIT, &addr_len); 1721 if (err >= 0) 1722 msg->msg_namelen = addr_len; 1723 return err; 1724} 1725 1726EXPORT_SYMBOL(sock_common_recvmsg); 1727 1728/* 1729 * Set socket options on an inet socket. 1730 */ 1731int sock_common_setsockopt(struct socket *sock, int level, int optname, 1732 char __user *optval, int optlen) 1733{ 1734 struct sock *sk = sock->sk; 1735 1736 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1737} 1738 1739EXPORT_SYMBOL(sock_common_setsockopt); 1740 1741#ifdef CONFIG_COMPAT 1742int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1743 char __user *optval, int optlen) 1744{ 1745 struct sock *sk = sock->sk; 1746 1747 if (sk->sk_prot->compat_setsockopt != NULL) 1748 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1749 optval, optlen); 1750 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1751} 1752EXPORT_SYMBOL(compat_sock_common_setsockopt); 1753#endif 1754 1755void sk_common_release(struct sock *sk) 1756{ 1757 if (sk->sk_prot->destroy) 1758 sk->sk_prot->destroy(sk); 1759 1760 /* 1761 * Observation: when sock_common_release is called, processes have 1762 * no access to socket. But net still has. 1763 * Step one, detach it from networking: 1764 * 1765 * A. Remove from hash tables. 1766 */ 1767 1768 sk->sk_prot->unhash(sk); 1769 1770 /* 1771 * In this point socket cannot receive new packets, but it is possible 1772 * that some packets are in flight because some CPU runs receiver and 1773 * did hash table lookup before we unhashed socket. They will achieve 1774 * receive queue and will be purged by socket destructor. 1775 * 1776 * Also we still have packets pending on receive queue and probably, 1777 * our own packets waiting in device queues. sock_destroy will drain 1778 * receive queue, but transmitted packets will delay socket destruction 1779 * until the last reference will be released. 1780 */ 1781 1782 sock_orphan(sk); 1783 1784 xfrm_sk_free_policy(sk); 1785 1786 sk_refcnt_debug_release(sk); 1787 sock_put(sk); 1788} 1789 1790EXPORT_SYMBOL(sk_common_release); 1791 1792static DEFINE_RWLOCK(proto_list_lock); 1793static LIST_HEAD(proto_list); 1794 1795int proto_register(struct proto *prot, int alloc_slab) 1796{ 1797 char *request_sock_slab_name = NULL; 1798 char *timewait_sock_slab_name; 1799 int rc = -ENOBUFS; 1800 1801 if (alloc_slab) { 1802 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1803 SLAB_HWCACHE_ALIGN, NULL); 1804 1805 if (prot->slab == NULL) { 1806 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1807 prot->name); 1808 goto out; 1809 } 1810 1811 if (prot->rsk_prot != NULL) { 1812 static const char mask[] = "request_sock_%s"; 1813 1814 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1815 if (request_sock_slab_name == NULL) 1816 goto out_free_sock_slab; 1817 1818 sprintf(request_sock_slab_name, mask, prot->name); 1819 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1820 prot->rsk_prot->obj_size, 0, 1821 SLAB_HWCACHE_ALIGN, NULL); 1822 1823 if (prot->rsk_prot->slab == NULL) { 1824 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1825 prot->name); 1826 goto out_free_request_sock_slab_name; 1827 } 1828 } 1829 1830 if (prot->twsk_prot != NULL) { 1831 static const char mask[] = "tw_sock_%s"; 1832 1833 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1834 1835 if (timewait_sock_slab_name == NULL) 1836 goto out_free_request_sock_slab; 1837 1838 sprintf(timewait_sock_slab_name, mask, prot->name); 1839 prot->twsk_prot->twsk_slab = 1840 kmem_cache_create(timewait_sock_slab_name, 1841 prot->twsk_prot->twsk_obj_size, 1842 0, SLAB_HWCACHE_ALIGN, 1843 NULL); 1844 if (prot->twsk_prot->twsk_slab == NULL) 1845 goto out_free_timewait_sock_slab_name; 1846 } 1847 } 1848 1849 write_lock(&proto_list_lock); 1850 list_add(&prot->node, &proto_list); 1851 write_unlock(&proto_list_lock); 1852 rc = 0; 1853out: 1854 return rc; 1855out_free_timewait_sock_slab_name: 1856 kfree(timewait_sock_slab_name); 1857out_free_request_sock_slab: 1858 if (prot->rsk_prot && prot->rsk_prot->slab) { 1859 kmem_cache_destroy(prot->rsk_prot->slab); 1860 prot->rsk_prot->slab = NULL; 1861 } 1862out_free_request_sock_slab_name: 1863 kfree(request_sock_slab_name); 1864out_free_sock_slab: 1865 kmem_cache_destroy(prot->slab); 1866 prot->slab = NULL; 1867 goto out; 1868} 1869 1870EXPORT_SYMBOL(proto_register); 1871 1872void proto_unregister(struct proto *prot) 1873{ 1874 write_lock(&proto_list_lock); 1875 list_del(&prot->node); 1876 write_unlock(&proto_list_lock); 1877 1878 if (prot->slab != NULL) { 1879 kmem_cache_destroy(prot->slab); 1880 prot->slab = NULL; 1881 } 1882 1883 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1884 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1885 1886 kmem_cache_destroy(prot->rsk_prot->slab); 1887 kfree(name); 1888 prot->rsk_prot->slab = NULL; 1889 } 1890 1891 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1892 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1893 1894 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1895 kfree(name); 1896 prot->twsk_prot->twsk_slab = NULL; 1897 } 1898} 1899 1900EXPORT_SYMBOL(proto_unregister); 1901 1902#ifdef CONFIG_PROC_FS 1903static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1904{ 1905 read_lock(&proto_list_lock); 1906 return seq_list_start_head(&proto_list, *pos); 1907} 1908 1909static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1910{ 1911 return seq_list_next(v, &proto_list, pos); 1912} 1913 1914static void proto_seq_stop(struct seq_file *seq, void *v) 1915{ 1916 read_unlock(&proto_list_lock); 1917} 1918 1919static char proto_method_implemented(const void *method) 1920{ 1921 return method == NULL ? 'n' : 'y'; 1922} 1923 1924static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1925{ 1926 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1927 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1928 proto->name, 1929 proto->obj_size, 1930 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1931 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1932 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1933 proto->max_header, 1934 proto->slab == NULL ? "no" : "yes", 1935 module_name(proto->owner), 1936 proto_method_implemented(proto->close), 1937 proto_method_implemented(proto->connect), 1938 proto_method_implemented(proto->disconnect), 1939 proto_method_implemented(proto->accept), 1940 proto_method_implemented(proto->ioctl), 1941 proto_method_implemented(proto->init), 1942 proto_method_implemented(proto->destroy), 1943 proto_method_implemented(proto->shutdown), 1944 proto_method_implemented(proto->setsockopt), 1945 proto_method_implemented(proto->getsockopt), 1946 proto_method_implemented(proto->sendmsg), 1947 proto_method_implemented(proto->recvmsg), 1948 proto_method_implemented(proto->sendpage), 1949 proto_method_implemented(proto->bind), 1950 proto_method_implemented(proto->backlog_rcv), 1951 proto_method_implemented(proto->hash), 1952 proto_method_implemented(proto->unhash), 1953 proto_method_implemented(proto->get_port), 1954 proto_method_implemented(proto->enter_memory_pressure)); 1955} 1956 1957static int proto_seq_show(struct seq_file *seq, void *v) 1958{ 1959 if (v == &proto_list) 1960 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1961 "protocol", 1962 "size", 1963 "sockets", 1964 "memory", 1965 "press", 1966 "maxhdr", 1967 "slab", 1968 "module", 1969 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1970 else 1971 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1972 return 0; 1973} 1974 1975static const struct seq_operations proto_seq_ops = { 1976 .start = proto_seq_start, 1977 .next = proto_seq_next, 1978 .stop = proto_seq_stop, 1979 .show = proto_seq_show, 1980}; 1981 1982static int proto_seq_open(struct inode *inode, struct file *file) 1983{ 1984 return seq_open(file, &proto_seq_ops); 1985} 1986 1987static const struct file_operations proto_seq_fops = { 1988 .owner = THIS_MODULE, 1989 .open = proto_seq_open, 1990 .read = seq_read, 1991 .llseek = seq_lseek, 1992 .release = seq_release, 1993}; 1994 1995static int __init proto_init(void) 1996{ 1997 /* register /proc/net/protocols */ 1998 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1999} 2000 2001subsys_initcall(proto_init); 2002 2003#endif /* PROC_FS */ 2004 2005EXPORT_SYMBOL(sk_alloc); 2006EXPORT_SYMBOL(sk_free); 2007EXPORT_SYMBOL(sk_send_sigurg); 2008EXPORT_SYMBOL(sock_alloc_send_skb); 2009EXPORT_SYMBOL(sock_init_data); 2010EXPORT_SYMBOL(sock_kfree_s); 2011EXPORT_SYMBOL(sock_kmalloc); 2012EXPORT_SYMBOL(sock_no_accept); 2013EXPORT_SYMBOL(sock_no_bind); 2014EXPORT_SYMBOL(sock_no_connect); 2015EXPORT_SYMBOL(sock_no_getname); 2016EXPORT_SYMBOL(sock_no_getsockopt); 2017EXPORT_SYMBOL(sock_no_ioctl); 2018EXPORT_SYMBOL(sock_no_listen); 2019EXPORT_SYMBOL(sock_no_mmap); 2020EXPORT_SYMBOL(sock_no_poll); 2021EXPORT_SYMBOL(sock_no_recvmsg); 2022EXPORT_SYMBOL(sock_no_sendmsg); 2023EXPORT_SYMBOL(sock_no_sendpage); 2024EXPORT_SYMBOL(sock_no_setsockopt); 2025EXPORT_SYMBOL(sock_no_shutdown); 2026EXPORT_SYMBOL(sock_no_socketpair); 2027EXPORT_SYMBOL(sock_rfree); 2028EXPORT_SYMBOL(sock_setsockopt); 2029EXPORT_SYMBOL(sock_wfree); 2030EXPORT_SYMBOL(sock_wmalloc); 2031EXPORT_SYMBOL(sock_i_uid); 2032EXPORT_SYMBOL(sock_i_ino); 2033EXPORT_SYMBOL(sysctl_optmem_max); 2034#ifdef CONFIG_SYSCTL 2035EXPORT_SYMBOL(sysctl_rmem_max); 2036EXPORT_SYMBOL(sysctl_wmem_max); 2037#endif 2038