sock.c revision 1e2e6b89f1d3152da0606d23e65e8760bf62a4c3
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} 872 873/** 874 * sk_alloc - All socket objects are allocated here 875 * @net: the applicable net namespace 876 * @family: protocol family 877 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 878 * @prot: struct proto associated with this new sock instance 879 * @zero_it: if we should zero the newly allocated sock 880 */ 881struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 882 struct proto *prot, int zero_it) 883{ 884 struct sock *sk = NULL; 885 struct kmem_cache *slab = prot->slab; 886 887 if (slab != NULL) 888 sk = kmem_cache_alloc(slab, priority); 889 else 890 sk = kmalloc(prot->obj_size, priority); 891 892 if (sk) { 893 if (zero_it) { 894 memset(sk, 0, prot->obj_size); 895 sk->sk_family = family; 896 /* 897 * See comment in struct sock definition to understand 898 * why we need sk_prot_creator -acme 899 */ 900 sk->sk_prot = sk->sk_prot_creator = prot; 901 sock_lock_init(sk); 902 sk->sk_net = get_net(net); 903 } 904 905 if (security_sk_alloc(sk, family, priority)) 906 goto out_free; 907 908 if (!try_module_get(prot->owner)) 909 goto out_free; 910 } 911 return sk; 912 913out_free: 914 if (slab != NULL) 915 kmem_cache_free(slab, sk); 916 else 917 kfree(sk); 918 return NULL; 919} 920 921void sk_free(struct sock *sk) 922{ 923 struct sk_filter *filter; 924 struct module *owner = sk->sk_prot_creator->owner; 925 926 if (sk->sk_destruct) 927 sk->sk_destruct(sk); 928 929 filter = rcu_dereference(sk->sk_filter); 930 if (filter) { 931 sk_filter_uncharge(sk, filter); 932 rcu_assign_pointer(sk->sk_filter, NULL); 933 } 934 935 sock_disable_timestamp(sk); 936 937 if (atomic_read(&sk->sk_omem_alloc)) 938 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 939 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 940 941 security_sk_free(sk); 942 put_net(sk->sk_net); 943 if (sk->sk_prot_creator->slab != NULL) 944 kmem_cache_free(sk->sk_prot_creator->slab, sk); 945 else 946 kfree(sk); 947 module_put(owner); 948} 949 950struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 951{ 952 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0); 953 954 if (newsk != NULL) { 955 struct sk_filter *filter; 956 957 sock_copy(newsk, sk); 958 959 /* SANITY */ 960 get_net(newsk->sk_net); 961 sk_node_init(&newsk->sk_node); 962 sock_lock_init(newsk); 963 bh_lock_sock(newsk); 964 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 965 966 atomic_set(&newsk->sk_rmem_alloc, 0); 967 atomic_set(&newsk->sk_wmem_alloc, 0); 968 atomic_set(&newsk->sk_omem_alloc, 0); 969 skb_queue_head_init(&newsk->sk_receive_queue); 970 skb_queue_head_init(&newsk->sk_write_queue); 971#ifdef CONFIG_NET_DMA 972 skb_queue_head_init(&newsk->sk_async_wait_queue); 973#endif 974 975 rwlock_init(&newsk->sk_dst_lock); 976 rwlock_init(&newsk->sk_callback_lock); 977 lockdep_set_class_and_name(&newsk->sk_callback_lock, 978 af_callback_keys + newsk->sk_family, 979 af_family_clock_key_strings[newsk->sk_family]); 980 981 newsk->sk_dst_cache = NULL; 982 newsk->sk_wmem_queued = 0; 983 newsk->sk_forward_alloc = 0; 984 newsk->sk_send_head = NULL; 985 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 986 987 sock_reset_flag(newsk, SOCK_DONE); 988 skb_queue_head_init(&newsk->sk_error_queue); 989 990 filter = newsk->sk_filter; 991 if (filter != NULL) 992 sk_filter_charge(newsk, filter); 993 994 if (unlikely(xfrm_sk_clone_policy(newsk))) { 995 /* It is still raw copy of parent, so invalidate 996 * destructor and make plain sk_free() */ 997 newsk->sk_destruct = NULL; 998 sk_free(newsk); 999 newsk = NULL; 1000 goto out; 1001 } 1002 1003 newsk->sk_err = 0; 1004 newsk->sk_priority = 0; 1005 atomic_set(&newsk->sk_refcnt, 2); 1006 1007 /* 1008 * Increment the counter in the same struct proto as the master 1009 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1010 * is the same as sk->sk_prot->socks, as this field was copied 1011 * with memcpy). 1012 * 1013 * This _changes_ the previous behaviour, where 1014 * tcp_create_openreq_child always was incrementing the 1015 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1016 * to be taken into account in all callers. -acme 1017 */ 1018 sk_refcnt_debug_inc(newsk); 1019 newsk->sk_socket = NULL; 1020 newsk->sk_sleep = NULL; 1021 1022 if (newsk->sk_prot->sockets_allocated) 1023 atomic_inc(newsk->sk_prot->sockets_allocated); 1024 } 1025out: 1026 return newsk; 1027} 1028 1029EXPORT_SYMBOL_GPL(sk_clone); 1030 1031void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1032{ 1033 __sk_dst_set(sk, dst); 1034 sk->sk_route_caps = dst->dev->features; 1035 if (sk->sk_route_caps & NETIF_F_GSO) 1036 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1037 if (sk_can_gso(sk)) { 1038 if (dst->header_len) 1039 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1040 else 1041 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1042 } 1043} 1044EXPORT_SYMBOL_GPL(sk_setup_caps); 1045 1046void __init sk_init(void) 1047{ 1048 if (num_physpages <= 4096) { 1049 sysctl_wmem_max = 32767; 1050 sysctl_rmem_max = 32767; 1051 sysctl_wmem_default = 32767; 1052 sysctl_rmem_default = 32767; 1053 } else if (num_physpages >= 131072) { 1054 sysctl_wmem_max = 131071; 1055 sysctl_rmem_max = 131071; 1056 } 1057} 1058 1059/* 1060 * Simple resource managers for sockets. 1061 */ 1062 1063 1064/* 1065 * Write buffer destructor automatically called from kfree_skb. 1066 */ 1067void sock_wfree(struct sk_buff *skb) 1068{ 1069 struct sock *sk = skb->sk; 1070 1071 /* In case it might be waiting for more memory. */ 1072 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1073 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1074 sk->sk_write_space(sk); 1075 sock_put(sk); 1076} 1077 1078/* 1079 * Read buffer destructor automatically called from kfree_skb. 1080 */ 1081void sock_rfree(struct sk_buff *skb) 1082{ 1083 struct sock *sk = skb->sk; 1084 1085 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1086} 1087 1088 1089int sock_i_uid(struct sock *sk) 1090{ 1091 int uid; 1092 1093 read_lock(&sk->sk_callback_lock); 1094 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1095 read_unlock(&sk->sk_callback_lock); 1096 return uid; 1097} 1098 1099unsigned long sock_i_ino(struct sock *sk) 1100{ 1101 unsigned long ino; 1102 1103 read_lock(&sk->sk_callback_lock); 1104 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1105 read_unlock(&sk->sk_callback_lock); 1106 return ino; 1107} 1108 1109/* 1110 * Allocate a skb from the socket's send buffer. 1111 */ 1112struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1113 gfp_t priority) 1114{ 1115 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1116 struct sk_buff * skb = alloc_skb(size, priority); 1117 if (skb) { 1118 skb_set_owner_w(skb, sk); 1119 return skb; 1120 } 1121 } 1122 return NULL; 1123} 1124 1125/* 1126 * Allocate a skb from the socket's receive buffer. 1127 */ 1128struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1129 gfp_t priority) 1130{ 1131 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1132 struct sk_buff *skb = alloc_skb(size, priority); 1133 if (skb) { 1134 skb_set_owner_r(skb, sk); 1135 return skb; 1136 } 1137 } 1138 return NULL; 1139} 1140 1141/* 1142 * Allocate a memory block from the socket's option memory buffer. 1143 */ 1144void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1145{ 1146 if ((unsigned)size <= sysctl_optmem_max && 1147 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1148 void *mem; 1149 /* First do the add, to avoid the race if kmalloc 1150 * might sleep. 1151 */ 1152 atomic_add(size, &sk->sk_omem_alloc); 1153 mem = kmalloc(size, priority); 1154 if (mem) 1155 return mem; 1156 atomic_sub(size, &sk->sk_omem_alloc); 1157 } 1158 return NULL; 1159} 1160 1161/* 1162 * Free an option memory block. 1163 */ 1164void sock_kfree_s(struct sock *sk, void *mem, int size) 1165{ 1166 kfree(mem); 1167 atomic_sub(size, &sk->sk_omem_alloc); 1168} 1169 1170/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1171 I think, these locks should be removed for datagram sockets. 1172 */ 1173static long sock_wait_for_wmem(struct sock * sk, long timeo) 1174{ 1175 DEFINE_WAIT(wait); 1176 1177 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1178 for (;;) { 1179 if (!timeo) 1180 break; 1181 if (signal_pending(current)) 1182 break; 1183 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1184 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1185 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1186 break; 1187 if (sk->sk_shutdown & SEND_SHUTDOWN) 1188 break; 1189 if (sk->sk_err) 1190 break; 1191 timeo = schedule_timeout(timeo); 1192 } 1193 finish_wait(sk->sk_sleep, &wait); 1194 return timeo; 1195} 1196 1197 1198/* 1199 * Generic send/receive buffer handlers 1200 */ 1201 1202static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1203 unsigned long header_len, 1204 unsigned long data_len, 1205 int noblock, int *errcode) 1206{ 1207 struct sk_buff *skb; 1208 gfp_t gfp_mask; 1209 long timeo; 1210 int err; 1211 1212 gfp_mask = sk->sk_allocation; 1213 if (gfp_mask & __GFP_WAIT) 1214 gfp_mask |= __GFP_REPEAT; 1215 1216 timeo = sock_sndtimeo(sk, noblock); 1217 while (1) { 1218 err = sock_error(sk); 1219 if (err != 0) 1220 goto failure; 1221 1222 err = -EPIPE; 1223 if (sk->sk_shutdown & SEND_SHUTDOWN) 1224 goto failure; 1225 1226 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1227 skb = alloc_skb(header_len, gfp_mask); 1228 if (skb) { 1229 int npages; 1230 int i; 1231 1232 /* No pages, we're done... */ 1233 if (!data_len) 1234 break; 1235 1236 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1237 skb->truesize += data_len; 1238 skb_shinfo(skb)->nr_frags = npages; 1239 for (i = 0; i < npages; i++) { 1240 struct page *page; 1241 skb_frag_t *frag; 1242 1243 page = alloc_pages(sk->sk_allocation, 0); 1244 if (!page) { 1245 err = -ENOBUFS; 1246 skb_shinfo(skb)->nr_frags = i; 1247 kfree_skb(skb); 1248 goto failure; 1249 } 1250 1251 frag = &skb_shinfo(skb)->frags[i]; 1252 frag->page = page; 1253 frag->page_offset = 0; 1254 frag->size = (data_len >= PAGE_SIZE ? 1255 PAGE_SIZE : 1256 data_len); 1257 data_len -= PAGE_SIZE; 1258 } 1259 1260 /* Full success... */ 1261 break; 1262 } 1263 err = -ENOBUFS; 1264 goto failure; 1265 } 1266 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1267 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1268 err = -EAGAIN; 1269 if (!timeo) 1270 goto failure; 1271 if (signal_pending(current)) 1272 goto interrupted; 1273 timeo = sock_wait_for_wmem(sk, timeo); 1274 } 1275 1276 skb_set_owner_w(skb, sk); 1277 return skb; 1278 1279interrupted: 1280 err = sock_intr_errno(timeo); 1281failure: 1282 *errcode = err; 1283 return NULL; 1284} 1285 1286struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1287 int noblock, int *errcode) 1288{ 1289 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1290} 1291 1292static void __lock_sock(struct sock *sk) 1293{ 1294 DEFINE_WAIT(wait); 1295 1296 for (;;) { 1297 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1298 TASK_UNINTERRUPTIBLE); 1299 spin_unlock_bh(&sk->sk_lock.slock); 1300 schedule(); 1301 spin_lock_bh(&sk->sk_lock.slock); 1302 if (!sock_owned_by_user(sk)) 1303 break; 1304 } 1305 finish_wait(&sk->sk_lock.wq, &wait); 1306} 1307 1308static void __release_sock(struct sock *sk) 1309{ 1310 struct sk_buff *skb = sk->sk_backlog.head; 1311 1312 do { 1313 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1314 bh_unlock_sock(sk); 1315 1316 do { 1317 struct sk_buff *next = skb->next; 1318 1319 skb->next = NULL; 1320 sk->sk_backlog_rcv(sk, skb); 1321 1322 /* 1323 * We are in process context here with softirqs 1324 * disabled, use cond_resched_softirq() to preempt. 1325 * This is safe to do because we've taken the backlog 1326 * queue private: 1327 */ 1328 cond_resched_softirq(); 1329 1330 skb = next; 1331 } while (skb != NULL); 1332 1333 bh_lock_sock(sk); 1334 } while ((skb = sk->sk_backlog.head) != NULL); 1335} 1336 1337/** 1338 * sk_wait_data - wait for data to arrive at sk_receive_queue 1339 * @sk: sock to wait on 1340 * @timeo: for how long 1341 * 1342 * Now socket state including sk->sk_err is changed only under lock, 1343 * hence we may omit checks after joining wait queue. 1344 * We check receive queue before schedule() only as optimization; 1345 * it is very likely that release_sock() added new data. 1346 */ 1347int sk_wait_data(struct sock *sk, long *timeo) 1348{ 1349 int rc; 1350 DEFINE_WAIT(wait); 1351 1352 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1353 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1354 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1355 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1356 finish_wait(sk->sk_sleep, &wait); 1357 return rc; 1358} 1359 1360EXPORT_SYMBOL(sk_wait_data); 1361 1362/* 1363 * Set of default routines for initialising struct proto_ops when 1364 * the protocol does not support a particular function. In certain 1365 * cases where it makes no sense for a protocol to have a "do nothing" 1366 * function, some default processing is provided. 1367 */ 1368 1369int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1370{ 1371 return -EOPNOTSUPP; 1372} 1373 1374int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1375 int len, int flags) 1376{ 1377 return -EOPNOTSUPP; 1378} 1379 1380int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1381{ 1382 return -EOPNOTSUPP; 1383} 1384 1385int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1386{ 1387 return -EOPNOTSUPP; 1388} 1389 1390int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1391 int *len, int peer) 1392{ 1393 return -EOPNOTSUPP; 1394} 1395 1396unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1397{ 1398 return 0; 1399} 1400 1401int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1402{ 1403 return -EOPNOTSUPP; 1404} 1405 1406int sock_no_listen(struct socket *sock, int backlog) 1407{ 1408 return -EOPNOTSUPP; 1409} 1410 1411int sock_no_shutdown(struct socket *sock, int how) 1412{ 1413 return -EOPNOTSUPP; 1414} 1415 1416int sock_no_setsockopt(struct socket *sock, int level, int optname, 1417 char __user *optval, int optlen) 1418{ 1419 return -EOPNOTSUPP; 1420} 1421 1422int sock_no_getsockopt(struct socket *sock, int level, int optname, 1423 char __user *optval, int __user *optlen) 1424{ 1425 return -EOPNOTSUPP; 1426} 1427 1428int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1429 size_t len) 1430{ 1431 return -EOPNOTSUPP; 1432} 1433 1434int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1435 size_t len, int flags) 1436{ 1437 return -EOPNOTSUPP; 1438} 1439 1440int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1441{ 1442 /* Mirror missing mmap method error code */ 1443 return -ENODEV; 1444} 1445 1446ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1447{ 1448 ssize_t res; 1449 struct msghdr msg = {.msg_flags = flags}; 1450 struct kvec iov; 1451 char *kaddr = kmap(page); 1452 iov.iov_base = kaddr + offset; 1453 iov.iov_len = size; 1454 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1455 kunmap(page); 1456 return res; 1457} 1458 1459/* 1460 * Default Socket Callbacks 1461 */ 1462 1463static void sock_def_wakeup(struct sock *sk) 1464{ 1465 read_lock(&sk->sk_callback_lock); 1466 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1467 wake_up_interruptible_all(sk->sk_sleep); 1468 read_unlock(&sk->sk_callback_lock); 1469} 1470 1471static void sock_def_error_report(struct sock *sk) 1472{ 1473 read_lock(&sk->sk_callback_lock); 1474 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1475 wake_up_interruptible(sk->sk_sleep); 1476 sk_wake_async(sk,0,POLL_ERR); 1477 read_unlock(&sk->sk_callback_lock); 1478} 1479 1480static void sock_def_readable(struct sock *sk, int len) 1481{ 1482 read_lock(&sk->sk_callback_lock); 1483 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1484 wake_up_interruptible(sk->sk_sleep); 1485 sk_wake_async(sk,1,POLL_IN); 1486 read_unlock(&sk->sk_callback_lock); 1487} 1488 1489static void sock_def_write_space(struct sock *sk) 1490{ 1491 read_lock(&sk->sk_callback_lock); 1492 1493 /* Do not wake up a writer until he can make "significant" 1494 * progress. --DaveM 1495 */ 1496 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1497 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1498 wake_up_interruptible(sk->sk_sleep); 1499 1500 /* Should agree with poll, otherwise some programs break */ 1501 if (sock_writeable(sk)) 1502 sk_wake_async(sk, 2, POLL_OUT); 1503 } 1504 1505 read_unlock(&sk->sk_callback_lock); 1506} 1507 1508static void sock_def_destruct(struct sock *sk) 1509{ 1510 kfree(sk->sk_protinfo); 1511} 1512 1513void sk_send_sigurg(struct sock *sk) 1514{ 1515 if (sk->sk_socket && sk->sk_socket->file) 1516 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1517 sk_wake_async(sk, 3, POLL_PRI); 1518} 1519 1520void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1521 unsigned long expires) 1522{ 1523 if (!mod_timer(timer, expires)) 1524 sock_hold(sk); 1525} 1526 1527EXPORT_SYMBOL(sk_reset_timer); 1528 1529void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1530{ 1531 if (timer_pending(timer) && del_timer(timer)) 1532 __sock_put(sk); 1533} 1534 1535EXPORT_SYMBOL(sk_stop_timer); 1536 1537void sock_init_data(struct socket *sock, struct sock *sk) 1538{ 1539 skb_queue_head_init(&sk->sk_receive_queue); 1540 skb_queue_head_init(&sk->sk_write_queue); 1541 skb_queue_head_init(&sk->sk_error_queue); 1542#ifdef CONFIG_NET_DMA 1543 skb_queue_head_init(&sk->sk_async_wait_queue); 1544#endif 1545 1546 sk->sk_send_head = NULL; 1547 1548 init_timer(&sk->sk_timer); 1549 1550 sk->sk_allocation = GFP_KERNEL; 1551 sk->sk_rcvbuf = sysctl_rmem_default; 1552 sk->sk_sndbuf = sysctl_wmem_default; 1553 sk->sk_state = TCP_CLOSE; 1554 sk->sk_socket = sock; 1555 1556 sock_set_flag(sk, SOCK_ZAPPED); 1557 1558 if (sock) { 1559 sk->sk_type = sock->type; 1560 sk->sk_sleep = &sock->wait; 1561 sock->sk = sk; 1562 } else 1563 sk->sk_sleep = NULL; 1564 1565 rwlock_init(&sk->sk_dst_lock); 1566 rwlock_init(&sk->sk_callback_lock); 1567 lockdep_set_class_and_name(&sk->sk_callback_lock, 1568 af_callback_keys + sk->sk_family, 1569 af_family_clock_key_strings[sk->sk_family]); 1570 1571 sk->sk_state_change = sock_def_wakeup; 1572 sk->sk_data_ready = sock_def_readable; 1573 sk->sk_write_space = sock_def_write_space; 1574 sk->sk_error_report = sock_def_error_report; 1575 sk->sk_destruct = sock_def_destruct; 1576 1577 sk->sk_sndmsg_page = NULL; 1578 sk->sk_sndmsg_off = 0; 1579 1580 sk->sk_peercred.pid = 0; 1581 sk->sk_peercred.uid = -1; 1582 sk->sk_peercred.gid = -1; 1583 sk->sk_write_pending = 0; 1584 sk->sk_rcvlowat = 1; 1585 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1586 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1587 1588 sk->sk_stamp = ktime_set(-1L, -1L); 1589 1590 atomic_set(&sk->sk_refcnt, 1); 1591} 1592 1593void fastcall lock_sock_nested(struct sock *sk, int subclass) 1594{ 1595 might_sleep(); 1596 spin_lock_bh(&sk->sk_lock.slock); 1597 if (sk->sk_lock.owned) 1598 __lock_sock(sk); 1599 sk->sk_lock.owned = 1; 1600 spin_unlock(&sk->sk_lock.slock); 1601 /* 1602 * The sk_lock has mutex_lock() semantics here: 1603 */ 1604 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1605 local_bh_enable(); 1606} 1607 1608EXPORT_SYMBOL(lock_sock_nested); 1609 1610void fastcall release_sock(struct sock *sk) 1611{ 1612 /* 1613 * The sk_lock has mutex_unlock() semantics: 1614 */ 1615 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1616 1617 spin_lock_bh(&sk->sk_lock.slock); 1618 if (sk->sk_backlog.tail) 1619 __release_sock(sk); 1620 sk->sk_lock.owned = 0; 1621 if (waitqueue_active(&sk->sk_lock.wq)) 1622 wake_up(&sk->sk_lock.wq); 1623 spin_unlock_bh(&sk->sk_lock.slock); 1624} 1625EXPORT_SYMBOL(release_sock); 1626 1627int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1628{ 1629 struct timeval tv; 1630 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1631 sock_enable_timestamp(sk); 1632 tv = ktime_to_timeval(sk->sk_stamp); 1633 if (tv.tv_sec == -1) 1634 return -ENOENT; 1635 if (tv.tv_sec == 0) { 1636 sk->sk_stamp = ktime_get_real(); 1637 tv = ktime_to_timeval(sk->sk_stamp); 1638 } 1639 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1640} 1641EXPORT_SYMBOL(sock_get_timestamp); 1642 1643int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1644{ 1645 struct timespec ts; 1646 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1647 sock_enable_timestamp(sk); 1648 ts = ktime_to_timespec(sk->sk_stamp); 1649 if (ts.tv_sec == -1) 1650 return -ENOENT; 1651 if (ts.tv_sec == 0) { 1652 sk->sk_stamp = ktime_get_real(); 1653 ts = ktime_to_timespec(sk->sk_stamp); 1654 } 1655 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1656} 1657EXPORT_SYMBOL(sock_get_timestampns); 1658 1659void sock_enable_timestamp(struct sock *sk) 1660{ 1661 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1662 sock_set_flag(sk, SOCK_TIMESTAMP); 1663 net_enable_timestamp(); 1664 } 1665} 1666 1667/* 1668 * Get a socket option on an socket. 1669 * 1670 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1671 * asynchronous errors should be reported by getsockopt. We assume 1672 * this means if you specify SO_ERROR (otherwise whats the point of it). 1673 */ 1674int sock_common_getsockopt(struct socket *sock, int level, int optname, 1675 char __user *optval, int __user *optlen) 1676{ 1677 struct sock *sk = sock->sk; 1678 1679 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1680} 1681 1682EXPORT_SYMBOL(sock_common_getsockopt); 1683 1684#ifdef CONFIG_COMPAT 1685int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1686 char __user *optval, int __user *optlen) 1687{ 1688 struct sock *sk = sock->sk; 1689 1690 if (sk->sk_prot->compat_getsockopt != NULL) 1691 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1692 optval, optlen); 1693 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1694} 1695EXPORT_SYMBOL(compat_sock_common_getsockopt); 1696#endif 1697 1698int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1699 struct msghdr *msg, size_t size, int flags) 1700{ 1701 struct sock *sk = sock->sk; 1702 int addr_len = 0; 1703 int err; 1704 1705 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1706 flags & ~MSG_DONTWAIT, &addr_len); 1707 if (err >= 0) 1708 msg->msg_namelen = addr_len; 1709 return err; 1710} 1711 1712EXPORT_SYMBOL(sock_common_recvmsg); 1713 1714/* 1715 * Set socket options on an inet socket. 1716 */ 1717int sock_common_setsockopt(struct socket *sock, int level, int optname, 1718 char __user *optval, int optlen) 1719{ 1720 struct sock *sk = sock->sk; 1721 1722 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1723} 1724 1725EXPORT_SYMBOL(sock_common_setsockopt); 1726 1727#ifdef CONFIG_COMPAT 1728int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1729 char __user *optval, int optlen) 1730{ 1731 struct sock *sk = sock->sk; 1732 1733 if (sk->sk_prot->compat_setsockopt != NULL) 1734 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1735 optval, optlen); 1736 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1737} 1738EXPORT_SYMBOL(compat_sock_common_setsockopt); 1739#endif 1740 1741void sk_common_release(struct sock *sk) 1742{ 1743 if (sk->sk_prot->destroy) 1744 sk->sk_prot->destroy(sk); 1745 1746 /* 1747 * Observation: when sock_common_release is called, processes have 1748 * no access to socket. But net still has. 1749 * Step one, detach it from networking: 1750 * 1751 * A. Remove from hash tables. 1752 */ 1753 1754 sk->sk_prot->unhash(sk); 1755 1756 /* 1757 * In this point socket cannot receive new packets, but it is possible 1758 * that some packets are in flight because some CPU runs receiver and 1759 * did hash table lookup before we unhashed socket. They will achieve 1760 * receive queue and will be purged by socket destructor. 1761 * 1762 * Also we still have packets pending on receive queue and probably, 1763 * our own packets waiting in device queues. sock_destroy will drain 1764 * receive queue, but transmitted packets will delay socket destruction 1765 * until the last reference will be released. 1766 */ 1767 1768 sock_orphan(sk); 1769 1770 xfrm_sk_free_policy(sk); 1771 1772 sk_refcnt_debug_release(sk); 1773 sock_put(sk); 1774} 1775 1776EXPORT_SYMBOL(sk_common_release); 1777 1778static DEFINE_RWLOCK(proto_list_lock); 1779static LIST_HEAD(proto_list); 1780 1781int proto_register(struct proto *prot, int alloc_slab) 1782{ 1783 char *request_sock_slab_name = NULL; 1784 char *timewait_sock_slab_name; 1785 int rc = -ENOBUFS; 1786 1787 if (alloc_slab) { 1788 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1789 SLAB_HWCACHE_ALIGN, NULL); 1790 1791 if (prot->slab == NULL) { 1792 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1793 prot->name); 1794 goto out; 1795 } 1796 1797 if (prot->rsk_prot != NULL) { 1798 static const char mask[] = "request_sock_%s"; 1799 1800 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1801 if (request_sock_slab_name == NULL) 1802 goto out_free_sock_slab; 1803 1804 sprintf(request_sock_slab_name, mask, prot->name); 1805 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1806 prot->rsk_prot->obj_size, 0, 1807 SLAB_HWCACHE_ALIGN, NULL); 1808 1809 if (prot->rsk_prot->slab == NULL) { 1810 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1811 prot->name); 1812 goto out_free_request_sock_slab_name; 1813 } 1814 } 1815 1816 if (prot->twsk_prot != NULL) { 1817 static const char mask[] = "tw_sock_%s"; 1818 1819 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1820 1821 if (timewait_sock_slab_name == NULL) 1822 goto out_free_request_sock_slab; 1823 1824 sprintf(timewait_sock_slab_name, mask, prot->name); 1825 prot->twsk_prot->twsk_slab = 1826 kmem_cache_create(timewait_sock_slab_name, 1827 prot->twsk_prot->twsk_obj_size, 1828 0, SLAB_HWCACHE_ALIGN, 1829 NULL); 1830 if (prot->twsk_prot->twsk_slab == NULL) 1831 goto out_free_timewait_sock_slab_name; 1832 } 1833 } 1834 1835 write_lock(&proto_list_lock); 1836 list_add(&prot->node, &proto_list); 1837 write_unlock(&proto_list_lock); 1838 rc = 0; 1839out: 1840 return rc; 1841out_free_timewait_sock_slab_name: 1842 kfree(timewait_sock_slab_name); 1843out_free_request_sock_slab: 1844 if (prot->rsk_prot && prot->rsk_prot->slab) { 1845 kmem_cache_destroy(prot->rsk_prot->slab); 1846 prot->rsk_prot->slab = NULL; 1847 } 1848out_free_request_sock_slab_name: 1849 kfree(request_sock_slab_name); 1850out_free_sock_slab: 1851 kmem_cache_destroy(prot->slab); 1852 prot->slab = NULL; 1853 goto out; 1854} 1855 1856EXPORT_SYMBOL(proto_register); 1857 1858void proto_unregister(struct proto *prot) 1859{ 1860 write_lock(&proto_list_lock); 1861 list_del(&prot->node); 1862 write_unlock(&proto_list_lock); 1863 1864 if (prot->slab != NULL) { 1865 kmem_cache_destroy(prot->slab); 1866 prot->slab = NULL; 1867 } 1868 1869 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1870 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1871 1872 kmem_cache_destroy(prot->rsk_prot->slab); 1873 kfree(name); 1874 prot->rsk_prot->slab = NULL; 1875 } 1876 1877 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1878 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1879 1880 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1881 kfree(name); 1882 prot->twsk_prot->twsk_slab = NULL; 1883 } 1884} 1885 1886EXPORT_SYMBOL(proto_unregister); 1887 1888#ifdef CONFIG_PROC_FS 1889static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1890{ 1891 read_lock(&proto_list_lock); 1892 return seq_list_start_head(&proto_list, *pos); 1893} 1894 1895static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1896{ 1897 return seq_list_next(v, &proto_list, pos); 1898} 1899 1900static void proto_seq_stop(struct seq_file *seq, void *v) 1901{ 1902 read_unlock(&proto_list_lock); 1903} 1904 1905static char proto_method_implemented(const void *method) 1906{ 1907 return method == NULL ? 'n' : 'y'; 1908} 1909 1910static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1911{ 1912 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1913 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1914 proto->name, 1915 proto->obj_size, 1916 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1917 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1918 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1919 proto->max_header, 1920 proto->slab == NULL ? "no" : "yes", 1921 module_name(proto->owner), 1922 proto_method_implemented(proto->close), 1923 proto_method_implemented(proto->connect), 1924 proto_method_implemented(proto->disconnect), 1925 proto_method_implemented(proto->accept), 1926 proto_method_implemented(proto->ioctl), 1927 proto_method_implemented(proto->init), 1928 proto_method_implemented(proto->destroy), 1929 proto_method_implemented(proto->shutdown), 1930 proto_method_implemented(proto->setsockopt), 1931 proto_method_implemented(proto->getsockopt), 1932 proto_method_implemented(proto->sendmsg), 1933 proto_method_implemented(proto->recvmsg), 1934 proto_method_implemented(proto->sendpage), 1935 proto_method_implemented(proto->bind), 1936 proto_method_implemented(proto->backlog_rcv), 1937 proto_method_implemented(proto->hash), 1938 proto_method_implemented(proto->unhash), 1939 proto_method_implemented(proto->get_port), 1940 proto_method_implemented(proto->enter_memory_pressure)); 1941} 1942 1943static int proto_seq_show(struct seq_file *seq, void *v) 1944{ 1945 if (v == &proto_list) 1946 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1947 "protocol", 1948 "size", 1949 "sockets", 1950 "memory", 1951 "press", 1952 "maxhdr", 1953 "slab", 1954 "module", 1955 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1956 else 1957 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1958 return 0; 1959} 1960 1961static const struct seq_operations proto_seq_ops = { 1962 .start = proto_seq_start, 1963 .next = proto_seq_next, 1964 .stop = proto_seq_stop, 1965 .show = proto_seq_show, 1966}; 1967 1968static int proto_seq_open(struct inode *inode, struct file *file) 1969{ 1970 return seq_open(file, &proto_seq_ops); 1971} 1972 1973static const struct file_operations proto_seq_fops = { 1974 .owner = THIS_MODULE, 1975 .open = proto_seq_open, 1976 .read = seq_read, 1977 .llseek = seq_lseek, 1978 .release = seq_release, 1979}; 1980 1981static int __init proto_init(void) 1982{ 1983 /* register /proc/net/protocols */ 1984 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1985} 1986 1987subsys_initcall(proto_init); 1988 1989#endif /* PROC_FS */ 1990 1991EXPORT_SYMBOL(sk_alloc); 1992EXPORT_SYMBOL(sk_free); 1993EXPORT_SYMBOL(sk_send_sigurg); 1994EXPORT_SYMBOL(sock_alloc_send_skb); 1995EXPORT_SYMBOL(sock_init_data); 1996EXPORT_SYMBOL(sock_kfree_s); 1997EXPORT_SYMBOL(sock_kmalloc); 1998EXPORT_SYMBOL(sock_no_accept); 1999EXPORT_SYMBOL(sock_no_bind); 2000EXPORT_SYMBOL(sock_no_connect); 2001EXPORT_SYMBOL(sock_no_getname); 2002EXPORT_SYMBOL(sock_no_getsockopt); 2003EXPORT_SYMBOL(sock_no_ioctl); 2004EXPORT_SYMBOL(sock_no_listen); 2005EXPORT_SYMBOL(sock_no_mmap); 2006EXPORT_SYMBOL(sock_no_poll); 2007EXPORT_SYMBOL(sock_no_recvmsg); 2008EXPORT_SYMBOL(sock_no_sendmsg); 2009EXPORT_SYMBOL(sock_no_sendpage); 2010EXPORT_SYMBOL(sock_no_setsockopt); 2011EXPORT_SYMBOL(sock_no_shutdown); 2012EXPORT_SYMBOL(sock_no_socketpair); 2013EXPORT_SYMBOL(sock_rfree); 2014EXPORT_SYMBOL(sock_setsockopt); 2015EXPORT_SYMBOL(sock_wfree); 2016EXPORT_SYMBOL(sock_wmalloc); 2017EXPORT_SYMBOL(sock_i_uid); 2018EXPORT_SYMBOL(sock_i_ino); 2019EXPORT_SYMBOL(sysctl_optmem_max); 2020#ifdef CONFIG_SYSCTL 2021EXPORT_SYMBOL(sysctl_rmem_max); 2022EXPORT_SYMBOL(sysctl_wmem_max); 2023#endif 2024