sock.c revision 3f0666ee3039443fa7b7cf436dd16ce0dd8e3f95
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 if (zero_it) 912 priority |= __GFP_ZERO; 913 914 sk = sk_prot_alloc(prot, priority); 915 if (sk) { 916 if (zero_it) { 917 sk->sk_family = family; 918 /* 919 * See comment in struct sock definition to understand 920 * why we need sk_prot_creator -acme 921 */ 922 sk->sk_prot = sk->sk_prot_creator = prot; 923 sock_lock_init(sk); 924 sk->sk_net = get_net(net); 925 } 926 927 if (security_sk_alloc(sk, family, priority)) 928 goto out_free; 929 930 if (!try_module_get(prot->owner)) 931 goto out_free; 932 } 933 return sk; 934 935out_free: 936 sk_prot_free(prot, sk); 937 return NULL; 938} 939 940void sk_free(struct sock *sk) 941{ 942 struct sk_filter *filter; 943 struct module *owner = sk->sk_prot_creator->owner; 944 945 if (sk->sk_destruct) 946 sk->sk_destruct(sk); 947 948 filter = rcu_dereference(sk->sk_filter); 949 if (filter) { 950 sk_filter_uncharge(sk, filter); 951 rcu_assign_pointer(sk->sk_filter, NULL); 952 } 953 954 sock_disable_timestamp(sk); 955 956 if (atomic_read(&sk->sk_omem_alloc)) 957 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 958 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 959 960 security_sk_free(sk); 961 put_net(sk->sk_net); 962 sk_prot_free(sk->sk_prot_creator, sk); 963 module_put(owner); 964} 965 966struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 967{ 968 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0); 969 970 if (newsk != NULL) { 971 struct sk_filter *filter; 972 973 sock_copy(newsk, sk); 974 975 /* SANITY */ 976 get_net(newsk->sk_net); 977 sk_node_init(&newsk->sk_node); 978 sock_lock_init(newsk); 979 bh_lock_sock(newsk); 980 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 981 982 atomic_set(&newsk->sk_rmem_alloc, 0); 983 atomic_set(&newsk->sk_wmem_alloc, 0); 984 atomic_set(&newsk->sk_omem_alloc, 0); 985 skb_queue_head_init(&newsk->sk_receive_queue); 986 skb_queue_head_init(&newsk->sk_write_queue); 987#ifdef CONFIG_NET_DMA 988 skb_queue_head_init(&newsk->sk_async_wait_queue); 989#endif 990 991 rwlock_init(&newsk->sk_dst_lock); 992 rwlock_init(&newsk->sk_callback_lock); 993 lockdep_set_class_and_name(&newsk->sk_callback_lock, 994 af_callback_keys + newsk->sk_family, 995 af_family_clock_key_strings[newsk->sk_family]); 996 997 newsk->sk_dst_cache = NULL; 998 newsk->sk_wmem_queued = 0; 999 newsk->sk_forward_alloc = 0; 1000 newsk->sk_send_head = NULL; 1001 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1002 1003 sock_reset_flag(newsk, SOCK_DONE); 1004 skb_queue_head_init(&newsk->sk_error_queue); 1005 1006 filter = newsk->sk_filter; 1007 if (filter != NULL) 1008 sk_filter_charge(newsk, filter); 1009 1010 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1011 /* It is still raw copy of parent, so invalidate 1012 * destructor and make plain sk_free() */ 1013 newsk->sk_destruct = NULL; 1014 sk_free(newsk); 1015 newsk = NULL; 1016 goto out; 1017 } 1018 1019 newsk->sk_err = 0; 1020 newsk->sk_priority = 0; 1021 atomic_set(&newsk->sk_refcnt, 2); 1022 1023 /* 1024 * Increment the counter in the same struct proto as the master 1025 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1026 * is the same as sk->sk_prot->socks, as this field was copied 1027 * with memcpy). 1028 * 1029 * This _changes_ the previous behaviour, where 1030 * tcp_create_openreq_child always was incrementing the 1031 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1032 * to be taken into account in all callers. -acme 1033 */ 1034 sk_refcnt_debug_inc(newsk); 1035 newsk->sk_socket = NULL; 1036 newsk->sk_sleep = NULL; 1037 1038 if (newsk->sk_prot->sockets_allocated) 1039 atomic_inc(newsk->sk_prot->sockets_allocated); 1040 } 1041out: 1042 return newsk; 1043} 1044 1045EXPORT_SYMBOL_GPL(sk_clone); 1046 1047void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1048{ 1049 __sk_dst_set(sk, dst); 1050 sk->sk_route_caps = dst->dev->features; 1051 if (sk->sk_route_caps & NETIF_F_GSO) 1052 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1053 if (sk_can_gso(sk)) { 1054 if (dst->header_len) 1055 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1056 else 1057 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1058 } 1059} 1060EXPORT_SYMBOL_GPL(sk_setup_caps); 1061 1062void __init sk_init(void) 1063{ 1064 if (num_physpages <= 4096) { 1065 sysctl_wmem_max = 32767; 1066 sysctl_rmem_max = 32767; 1067 sysctl_wmem_default = 32767; 1068 sysctl_rmem_default = 32767; 1069 } else if (num_physpages >= 131072) { 1070 sysctl_wmem_max = 131071; 1071 sysctl_rmem_max = 131071; 1072 } 1073} 1074 1075/* 1076 * Simple resource managers for sockets. 1077 */ 1078 1079 1080/* 1081 * Write buffer destructor automatically called from kfree_skb. 1082 */ 1083void sock_wfree(struct sk_buff *skb) 1084{ 1085 struct sock *sk = skb->sk; 1086 1087 /* In case it might be waiting for more memory. */ 1088 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1089 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1090 sk->sk_write_space(sk); 1091 sock_put(sk); 1092} 1093 1094/* 1095 * Read buffer destructor automatically called from kfree_skb. 1096 */ 1097void sock_rfree(struct sk_buff *skb) 1098{ 1099 struct sock *sk = skb->sk; 1100 1101 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1102} 1103 1104 1105int sock_i_uid(struct sock *sk) 1106{ 1107 int uid; 1108 1109 read_lock(&sk->sk_callback_lock); 1110 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1111 read_unlock(&sk->sk_callback_lock); 1112 return uid; 1113} 1114 1115unsigned long sock_i_ino(struct sock *sk) 1116{ 1117 unsigned long ino; 1118 1119 read_lock(&sk->sk_callback_lock); 1120 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1121 read_unlock(&sk->sk_callback_lock); 1122 return ino; 1123} 1124 1125/* 1126 * Allocate a skb from the socket's send buffer. 1127 */ 1128struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1129 gfp_t priority) 1130{ 1131 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1132 struct sk_buff * skb = alloc_skb(size, priority); 1133 if (skb) { 1134 skb_set_owner_w(skb, sk); 1135 return skb; 1136 } 1137 } 1138 return NULL; 1139} 1140 1141/* 1142 * Allocate a skb from the socket's receive buffer. 1143 */ 1144struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1145 gfp_t priority) 1146{ 1147 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1148 struct sk_buff *skb = alloc_skb(size, priority); 1149 if (skb) { 1150 skb_set_owner_r(skb, sk); 1151 return skb; 1152 } 1153 } 1154 return NULL; 1155} 1156 1157/* 1158 * Allocate a memory block from the socket's option memory buffer. 1159 */ 1160void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1161{ 1162 if ((unsigned)size <= sysctl_optmem_max && 1163 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1164 void *mem; 1165 /* First do the add, to avoid the race if kmalloc 1166 * might sleep. 1167 */ 1168 atomic_add(size, &sk->sk_omem_alloc); 1169 mem = kmalloc(size, priority); 1170 if (mem) 1171 return mem; 1172 atomic_sub(size, &sk->sk_omem_alloc); 1173 } 1174 return NULL; 1175} 1176 1177/* 1178 * Free an option memory block. 1179 */ 1180void sock_kfree_s(struct sock *sk, void *mem, int size) 1181{ 1182 kfree(mem); 1183 atomic_sub(size, &sk->sk_omem_alloc); 1184} 1185 1186/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1187 I think, these locks should be removed for datagram sockets. 1188 */ 1189static long sock_wait_for_wmem(struct sock * sk, long timeo) 1190{ 1191 DEFINE_WAIT(wait); 1192 1193 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1194 for (;;) { 1195 if (!timeo) 1196 break; 1197 if (signal_pending(current)) 1198 break; 1199 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1200 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1201 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1202 break; 1203 if (sk->sk_shutdown & SEND_SHUTDOWN) 1204 break; 1205 if (sk->sk_err) 1206 break; 1207 timeo = schedule_timeout(timeo); 1208 } 1209 finish_wait(sk->sk_sleep, &wait); 1210 return timeo; 1211} 1212 1213 1214/* 1215 * Generic send/receive buffer handlers 1216 */ 1217 1218static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1219 unsigned long header_len, 1220 unsigned long data_len, 1221 int noblock, int *errcode) 1222{ 1223 struct sk_buff *skb; 1224 gfp_t gfp_mask; 1225 long timeo; 1226 int err; 1227 1228 gfp_mask = sk->sk_allocation; 1229 if (gfp_mask & __GFP_WAIT) 1230 gfp_mask |= __GFP_REPEAT; 1231 1232 timeo = sock_sndtimeo(sk, noblock); 1233 while (1) { 1234 err = sock_error(sk); 1235 if (err != 0) 1236 goto failure; 1237 1238 err = -EPIPE; 1239 if (sk->sk_shutdown & SEND_SHUTDOWN) 1240 goto failure; 1241 1242 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1243 skb = alloc_skb(header_len, gfp_mask); 1244 if (skb) { 1245 int npages; 1246 int i; 1247 1248 /* No pages, we're done... */ 1249 if (!data_len) 1250 break; 1251 1252 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1253 skb->truesize += data_len; 1254 skb_shinfo(skb)->nr_frags = npages; 1255 for (i = 0; i < npages; i++) { 1256 struct page *page; 1257 skb_frag_t *frag; 1258 1259 page = alloc_pages(sk->sk_allocation, 0); 1260 if (!page) { 1261 err = -ENOBUFS; 1262 skb_shinfo(skb)->nr_frags = i; 1263 kfree_skb(skb); 1264 goto failure; 1265 } 1266 1267 frag = &skb_shinfo(skb)->frags[i]; 1268 frag->page = page; 1269 frag->page_offset = 0; 1270 frag->size = (data_len >= PAGE_SIZE ? 1271 PAGE_SIZE : 1272 data_len); 1273 data_len -= PAGE_SIZE; 1274 } 1275 1276 /* Full success... */ 1277 break; 1278 } 1279 err = -ENOBUFS; 1280 goto failure; 1281 } 1282 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1283 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1284 err = -EAGAIN; 1285 if (!timeo) 1286 goto failure; 1287 if (signal_pending(current)) 1288 goto interrupted; 1289 timeo = sock_wait_for_wmem(sk, timeo); 1290 } 1291 1292 skb_set_owner_w(skb, sk); 1293 return skb; 1294 1295interrupted: 1296 err = sock_intr_errno(timeo); 1297failure: 1298 *errcode = err; 1299 return NULL; 1300} 1301 1302struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1303 int noblock, int *errcode) 1304{ 1305 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1306} 1307 1308static void __lock_sock(struct sock *sk) 1309{ 1310 DEFINE_WAIT(wait); 1311 1312 for (;;) { 1313 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1314 TASK_UNINTERRUPTIBLE); 1315 spin_unlock_bh(&sk->sk_lock.slock); 1316 schedule(); 1317 spin_lock_bh(&sk->sk_lock.slock); 1318 if (!sock_owned_by_user(sk)) 1319 break; 1320 } 1321 finish_wait(&sk->sk_lock.wq, &wait); 1322} 1323 1324static void __release_sock(struct sock *sk) 1325{ 1326 struct sk_buff *skb = sk->sk_backlog.head; 1327 1328 do { 1329 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1330 bh_unlock_sock(sk); 1331 1332 do { 1333 struct sk_buff *next = skb->next; 1334 1335 skb->next = NULL; 1336 sk->sk_backlog_rcv(sk, skb); 1337 1338 /* 1339 * We are in process context here with softirqs 1340 * disabled, use cond_resched_softirq() to preempt. 1341 * This is safe to do because we've taken the backlog 1342 * queue private: 1343 */ 1344 cond_resched_softirq(); 1345 1346 skb = next; 1347 } while (skb != NULL); 1348 1349 bh_lock_sock(sk); 1350 } while ((skb = sk->sk_backlog.head) != NULL); 1351} 1352 1353/** 1354 * sk_wait_data - wait for data to arrive at sk_receive_queue 1355 * @sk: sock to wait on 1356 * @timeo: for how long 1357 * 1358 * Now socket state including sk->sk_err is changed only under lock, 1359 * hence we may omit checks after joining wait queue. 1360 * We check receive queue before schedule() only as optimization; 1361 * it is very likely that release_sock() added new data. 1362 */ 1363int sk_wait_data(struct sock *sk, long *timeo) 1364{ 1365 int rc; 1366 DEFINE_WAIT(wait); 1367 1368 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1369 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1370 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1371 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1372 finish_wait(sk->sk_sleep, &wait); 1373 return rc; 1374} 1375 1376EXPORT_SYMBOL(sk_wait_data); 1377 1378/* 1379 * Set of default routines for initialising struct proto_ops when 1380 * the protocol does not support a particular function. In certain 1381 * cases where it makes no sense for a protocol to have a "do nothing" 1382 * function, some default processing is provided. 1383 */ 1384 1385int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1386{ 1387 return -EOPNOTSUPP; 1388} 1389 1390int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1391 int len, int flags) 1392{ 1393 return -EOPNOTSUPP; 1394} 1395 1396int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1397{ 1398 return -EOPNOTSUPP; 1399} 1400 1401int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1402{ 1403 return -EOPNOTSUPP; 1404} 1405 1406int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1407 int *len, int peer) 1408{ 1409 return -EOPNOTSUPP; 1410} 1411 1412unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1413{ 1414 return 0; 1415} 1416 1417int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1418{ 1419 return -EOPNOTSUPP; 1420} 1421 1422int sock_no_listen(struct socket *sock, int backlog) 1423{ 1424 return -EOPNOTSUPP; 1425} 1426 1427int sock_no_shutdown(struct socket *sock, int how) 1428{ 1429 return -EOPNOTSUPP; 1430} 1431 1432int sock_no_setsockopt(struct socket *sock, int level, int optname, 1433 char __user *optval, int optlen) 1434{ 1435 return -EOPNOTSUPP; 1436} 1437 1438int sock_no_getsockopt(struct socket *sock, int level, int optname, 1439 char __user *optval, int __user *optlen) 1440{ 1441 return -EOPNOTSUPP; 1442} 1443 1444int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1445 size_t len) 1446{ 1447 return -EOPNOTSUPP; 1448} 1449 1450int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1451 size_t len, int flags) 1452{ 1453 return -EOPNOTSUPP; 1454} 1455 1456int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1457{ 1458 /* Mirror missing mmap method error code */ 1459 return -ENODEV; 1460} 1461 1462ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1463{ 1464 ssize_t res; 1465 struct msghdr msg = {.msg_flags = flags}; 1466 struct kvec iov; 1467 char *kaddr = kmap(page); 1468 iov.iov_base = kaddr + offset; 1469 iov.iov_len = size; 1470 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1471 kunmap(page); 1472 return res; 1473} 1474 1475/* 1476 * Default Socket Callbacks 1477 */ 1478 1479static void sock_def_wakeup(struct sock *sk) 1480{ 1481 read_lock(&sk->sk_callback_lock); 1482 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1483 wake_up_interruptible_all(sk->sk_sleep); 1484 read_unlock(&sk->sk_callback_lock); 1485} 1486 1487static void sock_def_error_report(struct sock *sk) 1488{ 1489 read_lock(&sk->sk_callback_lock); 1490 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1491 wake_up_interruptible(sk->sk_sleep); 1492 sk_wake_async(sk,0,POLL_ERR); 1493 read_unlock(&sk->sk_callback_lock); 1494} 1495 1496static void sock_def_readable(struct sock *sk, int len) 1497{ 1498 read_lock(&sk->sk_callback_lock); 1499 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1500 wake_up_interruptible(sk->sk_sleep); 1501 sk_wake_async(sk,1,POLL_IN); 1502 read_unlock(&sk->sk_callback_lock); 1503} 1504 1505static void sock_def_write_space(struct sock *sk) 1506{ 1507 read_lock(&sk->sk_callback_lock); 1508 1509 /* Do not wake up a writer until he can make "significant" 1510 * progress. --DaveM 1511 */ 1512 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1513 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1514 wake_up_interruptible(sk->sk_sleep); 1515 1516 /* Should agree with poll, otherwise some programs break */ 1517 if (sock_writeable(sk)) 1518 sk_wake_async(sk, 2, POLL_OUT); 1519 } 1520 1521 read_unlock(&sk->sk_callback_lock); 1522} 1523 1524static void sock_def_destruct(struct sock *sk) 1525{ 1526 kfree(sk->sk_protinfo); 1527} 1528 1529void sk_send_sigurg(struct sock *sk) 1530{ 1531 if (sk->sk_socket && sk->sk_socket->file) 1532 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1533 sk_wake_async(sk, 3, POLL_PRI); 1534} 1535 1536void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1537 unsigned long expires) 1538{ 1539 if (!mod_timer(timer, expires)) 1540 sock_hold(sk); 1541} 1542 1543EXPORT_SYMBOL(sk_reset_timer); 1544 1545void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1546{ 1547 if (timer_pending(timer) && del_timer(timer)) 1548 __sock_put(sk); 1549} 1550 1551EXPORT_SYMBOL(sk_stop_timer); 1552 1553void sock_init_data(struct socket *sock, struct sock *sk) 1554{ 1555 skb_queue_head_init(&sk->sk_receive_queue); 1556 skb_queue_head_init(&sk->sk_write_queue); 1557 skb_queue_head_init(&sk->sk_error_queue); 1558#ifdef CONFIG_NET_DMA 1559 skb_queue_head_init(&sk->sk_async_wait_queue); 1560#endif 1561 1562 sk->sk_send_head = NULL; 1563 1564 init_timer(&sk->sk_timer); 1565 1566 sk->sk_allocation = GFP_KERNEL; 1567 sk->sk_rcvbuf = sysctl_rmem_default; 1568 sk->sk_sndbuf = sysctl_wmem_default; 1569 sk->sk_state = TCP_CLOSE; 1570 sk->sk_socket = sock; 1571 1572 sock_set_flag(sk, SOCK_ZAPPED); 1573 1574 if (sock) { 1575 sk->sk_type = sock->type; 1576 sk->sk_sleep = &sock->wait; 1577 sock->sk = sk; 1578 } else 1579 sk->sk_sleep = NULL; 1580 1581 rwlock_init(&sk->sk_dst_lock); 1582 rwlock_init(&sk->sk_callback_lock); 1583 lockdep_set_class_and_name(&sk->sk_callback_lock, 1584 af_callback_keys + sk->sk_family, 1585 af_family_clock_key_strings[sk->sk_family]); 1586 1587 sk->sk_state_change = sock_def_wakeup; 1588 sk->sk_data_ready = sock_def_readable; 1589 sk->sk_write_space = sock_def_write_space; 1590 sk->sk_error_report = sock_def_error_report; 1591 sk->sk_destruct = sock_def_destruct; 1592 1593 sk->sk_sndmsg_page = NULL; 1594 sk->sk_sndmsg_off = 0; 1595 1596 sk->sk_peercred.pid = 0; 1597 sk->sk_peercred.uid = -1; 1598 sk->sk_peercred.gid = -1; 1599 sk->sk_write_pending = 0; 1600 sk->sk_rcvlowat = 1; 1601 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1602 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1603 1604 sk->sk_stamp = ktime_set(-1L, -1L); 1605 1606 atomic_set(&sk->sk_refcnt, 1); 1607} 1608 1609void fastcall lock_sock_nested(struct sock *sk, int subclass) 1610{ 1611 might_sleep(); 1612 spin_lock_bh(&sk->sk_lock.slock); 1613 if (sk->sk_lock.owned) 1614 __lock_sock(sk); 1615 sk->sk_lock.owned = 1; 1616 spin_unlock(&sk->sk_lock.slock); 1617 /* 1618 * The sk_lock has mutex_lock() semantics here: 1619 */ 1620 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1621 local_bh_enable(); 1622} 1623 1624EXPORT_SYMBOL(lock_sock_nested); 1625 1626void fastcall release_sock(struct sock *sk) 1627{ 1628 /* 1629 * The sk_lock has mutex_unlock() semantics: 1630 */ 1631 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1632 1633 spin_lock_bh(&sk->sk_lock.slock); 1634 if (sk->sk_backlog.tail) 1635 __release_sock(sk); 1636 sk->sk_lock.owned = 0; 1637 if (waitqueue_active(&sk->sk_lock.wq)) 1638 wake_up(&sk->sk_lock.wq); 1639 spin_unlock_bh(&sk->sk_lock.slock); 1640} 1641EXPORT_SYMBOL(release_sock); 1642 1643int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1644{ 1645 struct timeval tv; 1646 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1647 sock_enable_timestamp(sk); 1648 tv = ktime_to_timeval(sk->sk_stamp); 1649 if (tv.tv_sec == -1) 1650 return -ENOENT; 1651 if (tv.tv_sec == 0) { 1652 sk->sk_stamp = ktime_get_real(); 1653 tv = ktime_to_timeval(sk->sk_stamp); 1654 } 1655 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1656} 1657EXPORT_SYMBOL(sock_get_timestamp); 1658 1659int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1660{ 1661 struct timespec ts; 1662 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1663 sock_enable_timestamp(sk); 1664 ts = ktime_to_timespec(sk->sk_stamp); 1665 if (ts.tv_sec == -1) 1666 return -ENOENT; 1667 if (ts.tv_sec == 0) { 1668 sk->sk_stamp = ktime_get_real(); 1669 ts = ktime_to_timespec(sk->sk_stamp); 1670 } 1671 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1672} 1673EXPORT_SYMBOL(sock_get_timestampns); 1674 1675void sock_enable_timestamp(struct sock *sk) 1676{ 1677 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1678 sock_set_flag(sk, SOCK_TIMESTAMP); 1679 net_enable_timestamp(); 1680 } 1681} 1682 1683/* 1684 * Get a socket option on an socket. 1685 * 1686 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1687 * asynchronous errors should be reported by getsockopt. We assume 1688 * this means if you specify SO_ERROR (otherwise whats the point of it). 1689 */ 1690int sock_common_getsockopt(struct socket *sock, int level, int optname, 1691 char __user *optval, int __user *optlen) 1692{ 1693 struct sock *sk = sock->sk; 1694 1695 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1696} 1697 1698EXPORT_SYMBOL(sock_common_getsockopt); 1699 1700#ifdef CONFIG_COMPAT 1701int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1702 char __user *optval, int __user *optlen) 1703{ 1704 struct sock *sk = sock->sk; 1705 1706 if (sk->sk_prot->compat_getsockopt != NULL) 1707 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1708 optval, optlen); 1709 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1710} 1711EXPORT_SYMBOL(compat_sock_common_getsockopt); 1712#endif 1713 1714int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1715 struct msghdr *msg, size_t size, int flags) 1716{ 1717 struct sock *sk = sock->sk; 1718 int addr_len = 0; 1719 int err; 1720 1721 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1722 flags & ~MSG_DONTWAIT, &addr_len); 1723 if (err >= 0) 1724 msg->msg_namelen = addr_len; 1725 return err; 1726} 1727 1728EXPORT_SYMBOL(sock_common_recvmsg); 1729 1730/* 1731 * Set socket options on an inet socket. 1732 */ 1733int sock_common_setsockopt(struct socket *sock, int level, int optname, 1734 char __user *optval, int optlen) 1735{ 1736 struct sock *sk = sock->sk; 1737 1738 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1739} 1740 1741EXPORT_SYMBOL(sock_common_setsockopt); 1742 1743#ifdef CONFIG_COMPAT 1744int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1745 char __user *optval, int optlen) 1746{ 1747 struct sock *sk = sock->sk; 1748 1749 if (sk->sk_prot->compat_setsockopt != NULL) 1750 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1751 optval, optlen); 1752 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1753} 1754EXPORT_SYMBOL(compat_sock_common_setsockopt); 1755#endif 1756 1757void sk_common_release(struct sock *sk) 1758{ 1759 if (sk->sk_prot->destroy) 1760 sk->sk_prot->destroy(sk); 1761 1762 /* 1763 * Observation: when sock_common_release is called, processes have 1764 * no access to socket. But net still has. 1765 * Step one, detach it from networking: 1766 * 1767 * A. Remove from hash tables. 1768 */ 1769 1770 sk->sk_prot->unhash(sk); 1771 1772 /* 1773 * In this point socket cannot receive new packets, but it is possible 1774 * that some packets are in flight because some CPU runs receiver and 1775 * did hash table lookup before we unhashed socket. They will achieve 1776 * receive queue and will be purged by socket destructor. 1777 * 1778 * Also we still have packets pending on receive queue and probably, 1779 * our own packets waiting in device queues. sock_destroy will drain 1780 * receive queue, but transmitted packets will delay socket destruction 1781 * until the last reference will be released. 1782 */ 1783 1784 sock_orphan(sk); 1785 1786 xfrm_sk_free_policy(sk); 1787 1788 sk_refcnt_debug_release(sk); 1789 sock_put(sk); 1790} 1791 1792EXPORT_SYMBOL(sk_common_release); 1793 1794static DEFINE_RWLOCK(proto_list_lock); 1795static LIST_HEAD(proto_list); 1796 1797int proto_register(struct proto *prot, int alloc_slab) 1798{ 1799 char *request_sock_slab_name = NULL; 1800 char *timewait_sock_slab_name; 1801 int rc = -ENOBUFS; 1802 1803 if (alloc_slab) { 1804 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1805 SLAB_HWCACHE_ALIGN, NULL); 1806 1807 if (prot->slab == NULL) { 1808 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1809 prot->name); 1810 goto out; 1811 } 1812 1813 if (prot->rsk_prot != NULL) { 1814 static const char mask[] = "request_sock_%s"; 1815 1816 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1817 if (request_sock_slab_name == NULL) 1818 goto out_free_sock_slab; 1819 1820 sprintf(request_sock_slab_name, mask, prot->name); 1821 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1822 prot->rsk_prot->obj_size, 0, 1823 SLAB_HWCACHE_ALIGN, NULL); 1824 1825 if (prot->rsk_prot->slab == NULL) { 1826 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1827 prot->name); 1828 goto out_free_request_sock_slab_name; 1829 } 1830 } 1831 1832 if (prot->twsk_prot != NULL) { 1833 static const char mask[] = "tw_sock_%s"; 1834 1835 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1836 1837 if (timewait_sock_slab_name == NULL) 1838 goto out_free_request_sock_slab; 1839 1840 sprintf(timewait_sock_slab_name, mask, prot->name); 1841 prot->twsk_prot->twsk_slab = 1842 kmem_cache_create(timewait_sock_slab_name, 1843 prot->twsk_prot->twsk_obj_size, 1844 0, SLAB_HWCACHE_ALIGN, 1845 NULL); 1846 if (prot->twsk_prot->twsk_slab == NULL) 1847 goto out_free_timewait_sock_slab_name; 1848 } 1849 } 1850 1851 write_lock(&proto_list_lock); 1852 list_add(&prot->node, &proto_list); 1853 write_unlock(&proto_list_lock); 1854 rc = 0; 1855out: 1856 return rc; 1857out_free_timewait_sock_slab_name: 1858 kfree(timewait_sock_slab_name); 1859out_free_request_sock_slab: 1860 if (prot->rsk_prot && prot->rsk_prot->slab) { 1861 kmem_cache_destroy(prot->rsk_prot->slab); 1862 prot->rsk_prot->slab = NULL; 1863 } 1864out_free_request_sock_slab_name: 1865 kfree(request_sock_slab_name); 1866out_free_sock_slab: 1867 kmem_cache_destroy(prot->slab); 1868 prot->slab = NULL; 1869 goto out; 1870} 1871 1872EXPORT_SYMBOL(proto_register); 1873 1874void proto_unregister(struct proto *prot) 1875{ 1876 write_lock(&proto_list_lock); 1877 list_del(&prot->node); 1878 write_unlock(&proto_list_lock); 1879 1880 if (prot->slab != NULL) { 1881 kmem_cache_destroy(prot->slab); 1882 prot->slab = NULL; 1883 } 1884 1885 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1886 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1887 1888 kmem_cache_destroy(prot->rsk_prot->slab); 1889 kfree(name); 1890 prot->rsk_prot->slab = NULL; 1891 } 1892 1893 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1894 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1895 1896 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1897 kfree(name); 1898 prot->twsk_prot->twsk_slab = NULL; 1899 } 1900} 1901 1902EXPORT_SYMBOL(proto_unregister); 1903 1904#ifdef CONFIG_PROC_FS 1905static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1906{ 1907 read_lock(&proto_list_lock); 1908 return seq_list_start_head(&proto_list, *pos); 1909} 1910 1911static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1912{ 1913 return seq_list_next(v, &proto_list, pos); 1914} 1915 1916static void proto_seq_stop(struct seq_file *seq, void *v) 1917{ 1918 read_unlock(&proto_list_lock); 1919} 1920 1921static char proto_method_implemented(const void *method) 1922{ 1923 return method == NULL ? 'n' : 'y'; 1924} 1925 1926static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1927{ 1928 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1929 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1930 proto->name, 1931 proto->obj_size, 1932 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1933 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1934 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1935 proto->max_header, 1936 proto->slab == NULL ? "no" : "yes", 1937 module_name(proto->owner), 1938 proto_method_implemented(proto->close), 1939 proto_method_implemented(proto->connect), 1940 proto_method_implemented(proto->disconnect), 1941 proto_method_implemented(proto->accept), 1942 proto_method_implemented(proto->ioctl), 1943 proto_method_implemented(proto->init), 1944 proto_method_implemented(proto->destroy), 1945 proto_method_implemented(proto->shutdown), 1946 proto_method_implemented(proto->setsockopt), 1947 proto_method_implemented(proto->getsockopt), 1948 proto_method_implemented(proto->sendmsg), 1949 proto_method_implemented(proto->recvmsg), 1950 proto_method_implemented(proto->sendpage), 1951 proto_method_implemented(proto->bind), 1952 proto_method_implemented(proto->backlog_rcv), 1953 proto_method_implemented(proto->hash), 1954 proto_method_implemented(proto->unhash), 1955 proto_method_implemented(proto->get_port), 1956 proto_method_implemented(proto->enter_memory_pressure)); 1957} 1958 1959static int proto_seq_show(struct seq_file *seq, void *v) 1960{ 1961 if (v == &proto_list) 1962 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1963 "protocol", 1964 "size", 1965 "sockets", 1966 "memory", 1967 "press", 1968 "maxhdr", 1969 "slab", 1970 "module", 1971 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1972 else 1973 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1974 return 0; 1975} 1976 1977static const struct seq_operations proto_seq_ops = { 1978 .start = proto_seq_start, 1979 .next = proto_seq_next, 1980 .stop = proto_seq_stop, 1981 .show = proto_seq_show, 1982}; 1983 1984static int proto_seq_open(struct inode *inode, struct file *file) 1985{ 1986 return seq_open(file, &proto_seq_ops); 1987} 1988 1989static const struct file_operations proto_seq_fops = { 1990 .owner = THIS_MODULE, 1991 .open = proto_seq_open, 1992 .read = seq_read, 1993 .llseek = seq_lseek, 1994 .release = seq_release, 1995}; 1996 1997static int __init proto_init(void) 1998{ 1999 /* register /proc/net/protocols */ 2000 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 2001} 2002 2003subsys_initcall(proto_init); 2004 2005#endif /* PROC_FS */ 2006 2007EXPORT_SYMBOL(sk_alloc); 2008EXPORT_SYMBOL(sk_free); 2009EXPORT_SYMBOL(sk_send_sigurg); 2010EXPORT_SYMBOL(sock_alloc_send_skb); 2011EXPORT_SYMBOL(sock_init_data); 2012EXPORT_SYMBOL(sock_kfree_s); 2013EXPORT_SYMBOL(sock_kmalloc); 2014EXPORT_SYMBOL(sock_no_accept); 2015EXPORT_SYMBOL(sock_no_bind); 2016EXPORT_SYMBOL(sock_no_connect); 2017EXPORT_SYMBOL(sock_no_getname); 2018EXPORT_SYMBOL(sock_no_getsockopt); 2019EXPORT_SYMBOL(sock_no_ioctl); 2020EXPORT_SYMBOL(sock_no_listen); 2021EXPORT_SYMBOL(sock_no_mmap); 2022EXPORT_SYMBOL(sock_no_poll); 2023EXPORT_SYMBOL(sock_no_recvmsg); 2024EXPORT_SYMBOL(sock_no_sendmsg); 2025EXPORT_SYMBOL(sock_no_sendpage); 2026EXPORT_SYMBOL(sock_no_setsockopt); 2027EXPORT_SYMBOL(sock_no_shutdown); 2028EXPORT_SYMBOL(sock_no_socketpair); 2029EXPORT_SYMBOL(sock_rfree); 2030EXPORT_SYMBOL(sock_setsockopt); 2031EXPORT_SYMBOL(sock_wfree); 2032EXPORT_SYMBOL(sock_wmalloc); 2033EXPORT_SYMBOL(sock_i_uid); 2034EXPORT_SYMBOL(sock_i_ino); 2035EXPORT_SYMBOL(sysctl_optmem_max); 2036#ifdef CONFIG_SYSCTL 2037EXPORT_SYMBOL(sysctl_rmem_max); 2038EXPORT_SYMBOL(sysctl_wmem_max); 2039#endif 2040