sock.c revision bbbb1a812de596958163779ae5b0806bc53a83f4
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} 859 860/** 861 * sk_alloc - All socket objects are allocated here 862 * @net: the applicable net namespace 863 * @family: protocol family 864 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 865 * @prot: struct proto associated with this new sock instance 866 * @zero_it: if we should zero the newly allocated sock 867 */ 868struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 869 struct proto *prot, int zero_it) 870{ 871 struct sock *sk = NULL; 872 struct kmem_cache *slab = prot->slab; 873 874 if (slab != NULL) 875 sk = kmem_cache_alloc(slab, priority); 876 else 877 sk = kmalloc(prot->obj_size, priority); 878 879 if (sk) { 880 if (zero_it) { 881 memset(sk, 0, prot->obj_size); 882 sk->sk_family = family; 883 /* 884 * See comment in struct sock definition to understand 885 * why we need sk_prot_creator -acme 886 */ 887 sk->sk_prot = sk->sk_prot_creator = prot; 888 sock_lock_init(sk); 889 sk->sk_net = get_net(net); 890 } 891 892 if (security_sk_alloc(sk, family, priority)) 893 goto out_free; 894 895 if (!try_module_get(prot->owner)) 896 goto out_free; 897 } 898 return sk; 899 900out_free: 901 if (slab != NULL) 902 kmem_cache_free(slab, sk); 903 else 904 kfree(sk); 905 return NULL; 906} 907 908void sk_free(struct sock *sk) 909{ 910 struct sk_filter *filter; 911 struct module *owner = sk->sk_prot_creator->owner; 912 913 if (sk->sk_destruct) 914 sk->sk_destruct(sk); 915 916 filter = rcu_dereference(sk->sk_filter); 917 if (filter) { 918 sk_filter_uncharge(sk, filter); 919 rcu_assign_pointer(sk->sk_filter, NULL); 920 } 921 922 sock_disable_timestamp(sk); 923 924 if (atomic_read(&sk->sk_omem_alloc)) 925 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 926 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 927 928 security_sk_free(sk); 929 put_net(sk->sk_net); 930 if (sk->sk_prot_creator->slab != NULL) 931 kmem_cache_free(sk->sk_prot_creator->slab, sk); 932 else 933 kfree(sk); 934 module_put(owner); 935} 936 937struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 938{ 939 struct sock *newsk = sk_alloc(sk->sk_net, sk->sk_family, priority, sk->sk_prot, 0); 940 941 if (newsk != NULL) { 942 struct sk_filter *filter; 943 944 sock_copy(newsk, sk); 945 946 /* SANITY */ 947 sk_node_init(&newsk->sk_node); 948 sock_lock_init(newsk); 949 bh_lock_sock(newsk); 950 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 951 952 atomic_set(&newsk->sk_rmem_alloc, 0); 953 atomic_set(&newsk->sk_wmem_alloc, 0); 954 atomic_set(&newsk->sk_omem_alloc, 0); 955 skb_queue_head_init(&newsk->sk_receive_queue); 956 skb_queue_head_init(&newsk->sk_write_queue); 957#ifdef CONFIG_NET_DMA 958 skb_queue_head_init(&newsk->sk_async_wait_queue); 959#endif 960 961 rwlock_init(&newsk->sk_dst_lock); 962 rwlock_init(&newsk->sk_callback_lock); 963 lockdep_set_class_and_name(&newsk->sk_callback_lock, 964 af_callback_keys + newsk->sk_family, 965 af_family_clock_key_strings[newsk->sk_family]); 966 967 newsk->sk_dst_cache = NULL; 968 newsk->sk_wmem_queued = 0; 969 newsk->sk_forward_alloc = 0; 970 newsk->sk_send_head = NULL; 971 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 972 973 sock_reset_flag(newsk, SOCK_DONE); 974 skb_queue_head_init(&newsk->sk_error_queue); 975 976 filter = newsk->sk_filter; 977 if (filter != NULL) 978 sk_filter_charge(newsk, filter); 979 980 if (unlikely(xfrm_sk_clone_policy(newsk))) { 981 /* It is still raw copy of parent, so invalidate 982 * destructor and make plain sk_free() */ 983 newsk->sk_destruct = NULL; 984 sk_free(newsk); 985 newsk = NULL; 986 goto out; 987 } 988 989 newsk->sk_err = 0; 990 newsk->sk_priority = 0; 991 atomic_set(&newsk->sk_refcnt, 2); 992 993 /* 994 * Increment the counter in the same struct proto as the master 995 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 996 * is the same as sk->sk_prot->socks, as this field was copied 997 * with memcpy). 998 * 999 * This _changes_ the previous behaviour, where 1000 * tcp_create_openreq_child always was incrementing the 1001 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1002 * to be taken into account in all callers. -acme 1003 */ 1004 sk_refcnt_debug_inc(newsk); 1005 newsk->sk_socket = NULL; 1006 newsk->sk_sleep = NULL; 1007 1008 if (newsk->sk_prot->sockets_allocated) 1009 atomic_inc(newsk->sk_prot->sockets_allocated); 1010 } 1011out: 1012 return newsk; 1013} 1014 1015EXPORT_SYMBOL_GPL(sk_clone); 1016 1017void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1018{ 1019 __sk_dst_set(sk, dst); 1020 sk->sk_route_caps = dst->dev->features; 1021 if (sk->sk_route_caps & NETIF_F_GSO) 1022 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1023 if (sk_can_gso(sk)) { 1024 if (dst->header_len) 1025 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1026 else 1027 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1028 } 1029} 1030EXPORT_SYMBOL_GPL(sk_setup_caps); 1031 1032void __init sk_init(void) 1033{ 1034 if (num_physpages <= 4096) { 1035 sysctl_wmem_max = 32767; 1036 sysctl_rmem_max = 32767; 1037 sysctl_wmem_default = 32767; 1038 sysctl_rmem_default = 32767; 1039 } else if (num_physpages >= 131072) { 1040 sysctl_wmem_max = 131071; 1041 sysctl_rmem_max = 131071; 1042 } 1043} 1044 1045/* 1046 * Simple resource managers for sockets. 1047 */ 1048 1049 1050/* 1051 * Write buffer destructor automatically called from kfree_skb. 1052 */ 1053void sock_wfree(struct sk_buff *skb) 1054{ 1055 struct sock *sk = skb->sk; 1056 1057 /* In case it might be waiting for more memory. */ 1058 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1059 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1060 sk->sk_write_space(sk); 1061 sock_put(sk); 1062} 1063 1064/* 1065 * Read buffer destructor automatically called from kfree_skb. 1066 */ 1067void sock_rfree(struct sk_buff *skb) 1068{ 1069 struct sock *sk = skb->sk; 1070 1071 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1072} 1073 1074 1075int sock_i_uid(struct sock *sk) 1076{ 1077 int uid; 1078 1079 read_lock(&sk->sk_callback_lock); 1080 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1081 read_unlock(&sk->sk_callback_lock); 1082 return uid; 1083} 1084 1085unsigned long sock_i_ino(struct sock *sk) 1086{ 1087 unsigned long ino; 1088 1089 read_lock(&sk->sk_callback_lock); 1090 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1091 read_unlock(&sk->sk_callback_lock); 1092 return ino; 1093} 1094 1095/* 1096 * Allocate a skb from the socket's send buffer. 1097 */ 1098struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1099 gfp_t priority) 1100{ 1101 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1102 struct sk_buff * skb = alloc_skb(size, priority); 1103 if (skb) { 1104 skb_set_owner_w(skb, sk); 1105 return skb; 1106 } 1107 } 1108 return NULL; 1109} 1110 1111/* 1112 * Allocate a skb from the socket's receive buffer. 1113 */ 1114struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1115 gfp_t priority) 1116{ 1117 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1118 struct sk_buff *skb = alloc_skb(size, priority); 1119 if (skb) { 1120 skb_set_owner_r(skb, sk); 1121 return skb; 1122 } 1123 } 1124 return NULL; 1125} 1126 1127/* 1128 * Allocate a memory block from the socket's option memory buffer. 1129 */ 1130void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1131{ 1132 if ((unsigned)size <= sysctl_optmem_max && 1133 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1134 void *mem; 1135 /* First do the add, to avoid the race if kmalloc 1136 * might sleep. 1137 */ 1138 atomic_add(size, &sk->sk_omem_alloc); 1139 mem = kmalloc(size, priority); 1140 if (mem) 1141 return mem; 1142 atomic_sub(size, &sk->sk_omem_alloc); 1143 } 1144 return NULL; 1145} 1146 1147/* 1148 * Free an option memory block. 1149 */ 1150void sock_kfree_s(struct sock *sk, void *mem, int size) 1151{ 1152 kfree(mem); 1153 atomic_sub(size, &sk->sk_omem_alloc); 1154} 1155 1156/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1157 I think, these locks should be removed for datagram sockets. 1158 */ 1159static long sock_wait_for_wmem(struct sock * sk, long timeo) 1160{ 1161 DEFINE_WAIT(wait); 1162 1163 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1164 for (;;) { 1165 if (!timeo) 1166 break; 1167 if (signal_pending(current)) 1168 break; 1169 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1170 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1171 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1172 break; 1173 if (sk->sk_shutdown & SEND_SHUTDOWN) 1174 break; 1175 if (sk->sk_err) 1176 break; 1177 timeo = schedule_timeout(timeo); 1178 } 1179 finish_wait(sk->sk_sleep, &wait); 1180 return timeo; 1181} 1182 1183 1184/* 1185 * Generic send/receive buffer handlers 1186 */ 1187 1188static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1189 unsigned long header_len, 1190 unsigned long data_len, 1191 int noblock, int *errcode) 1192{ 1193 struct sk_buff *skb; 1194 gfp_t gfp_mask; 1195 long timeo; 1196 int err; 1197 1198 gfp_mask = sk->sk_allocation; 1199 if (gfp_mask & __GFP_WAIT) 1200 gfp_mask |= __GFP_REPEAT; 1201 1202 timeo = sock_sndtimeo(sk, noblock); 1203 while (1) { 1204 err = sock_error(sk); 1205 if (err != 0) 1206 goto failure; 1207 1208 err = -EPIPE; 1209 if (sk->sk_shutdown & SEND_SHUTDOWN) 1210 goto failure; 1211 1212 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1213 skb = alloc_skb(header_len, gfp_mask); 1214 if (skb) { 1215 int npages; 1216 int i; 1217 1218 /* No pages, we're done... */ 1219 if (!data_len) 1220 break; 1221 1222 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1223 skb->truesize += data_len; 1224 skb_shinfo(skb)->nr_frags = npages; 1225 for (i = 0; i < npages; i++) { 1226 struct page *page; 1227 skb_frag_t *frag; 1228 1229 page = alloc_pages(sk->sk_allocation, 0); 1230 if (!page) { 1231 err = -ENOBUFS; 1232 skb_shinfo(skb)->nr_frags = i; 1233 kfree_skb(skb); 1234 goto failure; 1235 } 1236 1237 frag = &skb_shinfo(skb)->frags[i]; 1238 frag->page = page; 1239 frag->page_offset = 0; 1240 frag->size = (data_len >= PAGE_SIZE ? 1241 PAGE_SIZE : 1242 data_len); 1243 data_len -= PAGE_SIZE; 1244 } 1245 1246 /* Full success... */ 1247 break; 1248 } 1249 err = -ENOBUFS; 1250 goto failure; 1251 } 1252 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1253 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1254 err = -EAGAIN; 1255 if (!timeo) 1256 goto failure; 1257 if (signal_pending(current)) 1258 goto interrupted; 1259 timeo = sock_wait_for_wmem(sk, timeo); 1260 } 1261 1262 skb_set_owner_w(skb, sk); 1263 return skb; 1264 1265interrupted: 1266 err = sock_intr_errno(timeo); 1267failure: 1268 *errcode = err; 1269 return NULL; 1270} 1271 1272struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1273 int noblock, int *errcode) 1274{ 1275 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1276} 1277 1278static void __lock_sock(struct sock *sk) 1279{ 1280 DEFINE_WAIT(wait); 1281 1282 for (;;) { 1283 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1284 TASK_UNINTERRUPTIBLE); 1285 spin_unlock_bh(&sk->sk_lock.slock); 1286 schedule(); 1287 spin_lock_bh(&sk->sk_lock.slock); 1288 if (!sock_owned_by_user(sk)) 1289 break; 1290 } 1291 finish_wait(&sk->sk_lock.wq, &wait); 1292} 1293 1294static void __release_sock(struct sock *sk) 1295{ 1296 struct sk_buff *skb = sk->sk_backlog.head; 1297 1298 do { 1299 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1300 bh_unlock_sock(sk); 1301 1302 do { 1303 struct sk_buff *next = skb->next; 1304 1305 skb->next = NULL; 1306 sk->sk_backlog_rcv(sk, skb); 1307 1308 /* 1309 * We are in process context here with softirqs 1310 * disabled, use cond_resched_softirq() to preempt. 1311 * This is safe to do because we've taken the backlog 1312 * queue private: 1313 */ 1314 cond_resched_softirq(); 1315 1316 skb = next; 1317 } while (skb != NULL); 1318 1319 bh_lock_sock(sk); 1320 } while ((skb = sk->sk_backlog.head) != NULL); 1321} 1322 1323/** 1324 * sk_wait_data - wait for data to arrive at sk_receive_queue 1325 * @sk: sock to wait on 1326 * @timeo: for how long 1327 * 1328 * Now socket state including sk->sk_err is changed only under lock, 1329 * hence we may omit checks after joining wait queue. 1330 * We check receive queue before schedule() only as optimization; 1331 * it is very likely that release_sock() added new data. 1332 */ 1333int sk_wait_data(struct sock *sk, long *timeo) 1334{ 1335 int rc; 1336 DEFINE_WAIT(wait); 1337 1338 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1339 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1340 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1341 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1342 finish_wait(sk->sk_sleep, &wait); 1343 return rc; 1344} 1345 1346EXPORT_SYMBOL(sk_wait_data); 1347 1348/* 1349 * Set of default routines for initialising struct proto_ops when 1350 * the protocol does not support a particular function. In certain 1351 * cases where it makes no sense for a protocol to have a "do nothing" 1352 * function, some default processing is provided. 1353 */ 1354 1355int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1356{ 1357 return -EOPNOTSUPP; 1358} 1359 1360int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1361 int len, int flags) 1362{ 1363 return -EOPNOTSUPP; 1364} 1365 1366int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1367{ 1368 return -EOPNOTSUPP; 1369} 1370 1371int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1372{ 1373 return -EOPNOTSUPP; 1374} 1375 1376int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1377 int *len, int peer) 1378{ 1379 return -EOPNOTSUPP; 1380} 1381 1382unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1383{ 1384 return 0; 1385} 1386 1387int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1388{ 1389 return -EOPNOTSUPP; 1390} 1391 1392int sock_no_listen(struct socket *sock, int backlog) 1393{ 1394 return -EOPNOTSUPP; 1395} 1396 1397int sock_no_shutdown(struct socket *sock, int how) 1398{ 1399 return -EOPNOTSUPP; 1400} 1401 1402int sock_no_setsockopt(struct socket *sock, int level, int optname, 1403 char __user *optval, int optlen) 1404{ 1405 return -EOPNOTSUPP; 1406} 1407 1408int sock_no_getsockopt(struct socket *sock, int level, int optname, 1409 char __user *optval, int __user *optlen) 1410{ 1411 return -EOPNOTSUPP; 1412} 1413 1414int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1415 size_t len) 1416{ 1417 return -EOPNOTSUPP; 1418} 1419 1420int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1421 size_t len, int flags) 1422{ 1423 return -EOPNOTSUPP; 1424} 1425 1426int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1427{ 1428 /* Mirror missing mmap method error code */ 1429 return -ENODEV; 1430} 1431 1432ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1433{ 1434 ssize_t res; 1435 struct msghdr msg = {.msg_flags = flags}; 1436 struct kvec iov; 1437 char *kaddr = kmap(page); 1438 iov.iov_base = kaddr + offset; 1439 iov.iov_len = size; 1440 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1441 kunmap(page); 1442 return res; 1443} 1444 1445/* 1446 * Default Socket Callbacks 1447 */ 1448 1449static void sock_def_wakeup(struct sock *sk) 1450{ 1451 read_lock(&sk->sk_callback_lock); 1452 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1453 wake_up_interruptible_all(sk->sk_sleep); 1454 read_unlock(&sk->sk_callback_lock); 1455} 1456 1457static void sock_def_error_report(struct sock *sk) 1458{ 1459 read_lock(&sk->sk_callback_lock); 1460 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1461 wake_up_interruptible(sk->sk_sleep); 1462 sk_wake_async(sk,0,POLL_ERR); 1463 read_unlock(&sk->sk_callback_lock); 1464} 1465 1466static void sock_def_readable(struct sock *sk, int len) 1467{ 1468 read_lock(&sk->sk_callback_lock); 1469 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1470 wake_up_interruptible(sk->sk_sleep); 1471 sk_wake_async(sk,1,POLL_IN); 1472 read_unlock(&sk->sk_callback_lock); 1473} 1474 1475static void sock_def_write_space(struct sock *sk) 1476{ 1477 read_lock(&sk->sk_callback_lock); 1478 1479 /* Do not wake up a writer until he can make "significant" 1480 * progress. --DaveM 1481 */ 1482 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1483 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1484 wake_up_interruptible(sk->sk_sleep); 1485 1486 /* Should agree with poll, otherwise some programs break */ 1487 if (sock_writeable(sk)) 1488 sk_wake_async(sk, 2, POLL_OUT); 1489 } 1490 1491 read_unlock(&sk->sk_callback_lock); 1492} 1493 1494static void sock_def_destruct(struct sock *sk) 1495{ 1496 kfree(sk->sk_protinfo); 1497} 1498 1499void sk_send_sigurg(struct sock *sk) 1500{ 1501 if (sk->sk_socket && sk->sk_socket->file) 1502 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1503 sk_wake_async(sk, 3, POLL_PRI); 1504} 1505 1506void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1507 unsigned long expires) 1508{ 1509 if (!mod_timer(timer, expires)) 1510 sock_hold(sk); 1511} 1512 1513EXPORT_SYMBOL(sk_reset_timer); 1514 1515void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1516{ 1517 if (timer_pending(timer) && del_timer(timer)) 1518 __sock_put(sk); 1519} 1520 1521EXPORT_SYMBOL(sk_stop_timer); 1522 1523void sock_init_data(struct socket *sock, struct sock *sk) 1524{ 1525 skb_queue_head_init(&sk->sk_receive_queue); 1526 skb_queue_head_init(&sk->sk_write_queue); 1527 skb_queue_head_init(&sk->sk_error_queue); 1528#ifdef CONFIG_NET_DMA 1529 skb_queue_head_init(&sk->sk_async_wait_queue); 1530#endif 1531 1532 sk->sk_send_head = NULL; 1533 1534 init_timer(&sk->sk_timer); 1535 1536 sk->sk_allocation = GFP_KERNEL; 1537 sk->sk_rcvbuf = sysctl_rmem_default; 1538 sk->sk_sndbuf = sysctl_wmem_default; 1539 sk->sk_state = TCP_CLOSE; 1540 sk->sk_socket = sock; 1541 1542 sock_set_flag(sk, SOCK_ZAPPED); 1543 1544 if (sock) { 1545 sk->sk_type = sock->type; 1546 sk->sk_sleep = &sock->wait; 1547 sock->sk = sk; 1548 } else 1549 sk->sk_sleep = NULL; 1550 1551 rwlock_init(&sk->sk_dst_lock); 1552 rwlock_init(&sk->sk_callback_lock); 1553 lockdep_set_class_and_name(&sk->sk_callback_lock, 1554 af_callback_keys + sk->sk_family, 1555 af_family_clock_key_strings[sk->sk_family]); 1556 1557 sk->sk_state_change = sock_def_wakeup; 1558 sk->sk_data_ready = sock_def_readable; 1559 sk->sk_write_space = sock_def_write_space; 1560 sk->sk_error_report = sock_def_error_report; 1561 sk->sk_destruct = sock_def_destruct; 1562 1563 sk->sk_sndmsg_page = NULL; 1564 sk->sk_sndmsg_off = 0; 1565 1566 sk->sk_peercred.pid = 0; 1567 sk->sk_peercred.uid = -1; 1568 sk->sk_peercred.gid = -1; 1569 sk->sk_write_pending = 0; 1570 sk->sk_rcvlowat = 1; 1571 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1572 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1573 1574 sk->sk_stamp = ktime_set(-1L, -1L); 1575 1576 atomic_set(&sk->sk_refcnt, 1); 1577} 1578 1579void fastcall lock_sock_nested(struct sock *sk, int subclass) 1580{ 1581 might_sleep(); 1582 spin_lock_bh(&sk->sk_lock.slock); 1583 if (sk->sk_lock.owned) 1584 __lock_sock(sk); 1585 sk->sk_lock.owned = 1; 1586 spin_unlock(&sk->sk_lock.slock); 1587 /* 1588 * The sk_lock has mutex_lock() semantics here: 1589 */ 1590 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1591 local_bh_enable(); 1592} 1593 1594EXPORT_SYMBOL(lock_sock_nested); 1595 1596void fastcall release_sock(struct sock *sk) 1597{ 1598 /* 1599 * The sk_lock has mutex_unlock() semantics: 1600 */ 1601 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1602 1603 spin_lock_bh(&sk->sk_lock.slock); 1604 if (sk->sk_backlog.tail) 1605 __release_sock(sk); 1606 sk->sk_lock.owned = 0; 1607 if (waitqueue_active(&sk->sk_lock.wq)) 1608 wake_up(&sk->sk_lock.wq); 1609 spin_unlock_bh(&sk->sk_lock.slock); 1610} 1611EXPORT_SYMBOL(release_sock); 1612 1613int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1614{ 1615 struct timeval tv; 1616 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1617 sock_enable_timestamp(sk); 1618 tv = ktime_to_timeval(sk->sk_stamp); 1619 if (tv.tv_sec == -1) 1620 return -ENOENT; 1621 if (tv.tv_sec == 0) { 1622 sk->sk_stamp = ktime_get_real(); 1623 tv = ktime_to_timeval(sk->sk_stamp); 1624 } 1625 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1626} 1627EXPORT_SYMBOL(sock_get_timestamp); 1628 1629int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1630{ 1631 struct timespec ts; 1632 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1633 sock_enable_timestamp(sk); 1634 ts = ktime_to_timespec(sk->sk_stamp); 1635 if (ts.tv_sec == -1) 1636 return -ENOENT; 1637 if (ts.tv_sec == 0) { 1638 sk->sk_stamp = ktime_get_real(); 1639 ts = ktime_to_timespec(sk->sk_stamp); 1640 } 1641 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1642} 1643EXPORT_SYMBOL(sock_get_timestampns); 1644 1645void sock_enable_timestamp(struct sock *sk) 1646{ 1647 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1648 sock_set_flag(sk, SOCK_TIMESTAMP); 1649 net_enable_timestamp(); 1650 } 1651} 1652 1653/* 1654 * Get a socket option on an socket. 1655 * 1656 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1657 * asynchronous errors should be reported by getsockopt. We assume 1658 * this means if you specify SO_ERROR (otherwise whats the point of it). 1659 */ 1660int sock_common_getsockopt(struct socket *sock, int level, int optname, 1661 char __user *optval, int __user *optlen) 1662{ 1663 struct sock *sk = sock->sk; 1664 1665 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1666} 1667 1668EXPORT_SYMBOL(sock_common_getsockopt); 1669 1670#ifdef CONFIG_COMPAT 1671int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1672 char __user *optval, int __user *optlen) 1673{ 1674 struct sock *sk = sock->sk; 1675 1676 if (sk->sk_prot->compat_getsockopt != NULL) 1677 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1678 optval, optlen); 1679 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1680} 1681EXPORT_SYMBOL(compat_sock_common_getsockopt); 1682#endif 1683 1684int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1685 struct msghdr *msg, size_t size, int flags) 1686{ 1687 struct sock *sk = sock->sk; 1688 int addr_len = 0; 1689 int err; 1690 1691 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1692 flags & ~MSG_DONTWAIT, &addr_len); 1693 if (err >= 0) 1694 msg->msg_namelen = addr_len; 1695 return err; 1696} 1697 1698EXPORT_SYMBOL(sock_common_recvmsg); 1699 1700/* 1701 * Set socket options on an inet socket. 1702 */ 1703int sock_common_setsockopt(struct socket *sock, int level, int optname, 1704 char __user *optval, int optlen) 1705{ 1706 struct sock *sk = sock->sk; 1707 1708 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1709} 1710 1711EXPORT_SYMBOL(sock_common_setsockopt); 1712 1713#ifdef CONFIG_COMPAT 1714int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1715 char __user *optval, int optlen) 1716{ 1717 struct sock *sk = sock->sk; 1718 1719 if (sk->sk_prot->compat_setsockopt != NULL) 1720 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1721 optval, optlen); 1722 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1723} 1724EXPORT_SYMBOL(compat_sock_common_setsockopt); 1725#endif 1726 1727void sk_common_release(struct sock *sk) 1728{ 1729 if (sk->sk_prot->destroy) 1730 sk->sk_prot->destroy(sk); 1731 1732 /* 1733 * Observation: when sock_common_release is called, processes have 1734 * no access to socket. But net still has. 1735 * Step one, detach it from networking: 1736 * 1737 * A. Remove from hash tables. 1738 */ 1739 1740 sk->sk_prot->unhash(sk); 1741 1742 /* 1743 * In this point socket cannot receive new packets, but it is possible 1744 * that some packets are in flight because some CPU runs receiver and 1745 * did hash table lookup before we unhashed socket. They will achieve 1746 * receive queue and will be purged by socket destructor. 1747 * 1748 * Also we still have packets pending on receive queue and probably, 1749 * our own packets waiting in device queues. sock_destroy will drain 1750 * receive queue, but transmitted packets will delay socket destruction 1751 * until the last reference will be released. 1752 */ 1753 1754 sock_orphan(sk); 1755 1756 xfrm_sk_free_policy(sk); 1757 1758 sk_refcnt_debug_release(sk); 1759 sock_put(sk); 1760} 1761 1762EXPORT_SYMBOL(sk_common_release); 1763 1764static DEFINE_RWLOCK(proto_list_lock); 1765static LIST_HEAD(proto_list); 1766 1767int proto_register(struct proto *prot, int alloc_slab) 1768{ 1769 char *request_sock_slab_name = NULL; 1770 char *timewait_sock_slab_name; 1771 int rc = -ENOBUFS; 1772 1773 if (alloc_slab) { 1774 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1775 SLAB_HWCACHE_ALIGN, NULL); 1776 1777 if (prot->slab == NULL) { 1778 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1779 prot->name); 1780 goto out; 1781 } 1782 1783 if (prot->rsk_prot != NULL) { 1784 static const char mask[] = "request_sock_%s"; 1785 1786 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1787 if (request_sock_slab_name == NULL) 1788 goto out_free_sock_slab; 1789 1790 sprintf(request_sock_slab_name, mask, prot->name); 1791 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1792 prot->rsk_prot->obj_size, 0, 1793 SLAB_HWCACHE_ALIGN, NULL); 1794 1795 if (prot->rsk_prot->slab == NULL) { 1796 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1797 prot->name); 1798 goto out_free_request_sock_slab_name; 1799 } 1800 } 1801 1802 if (prot->twsk_prot != NULL) { 1803 static const char mask[] = "tw_sock_%s"; 1804 1805 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1806 1807 if (timewait_sock_slab_name == NULL) 1808 goto out_free_request_sock_slab; 1809 1810 sprintf(timewait_sock_slab_name, mask, prot->name); 1811 prot->twsk_prot->twsk_slab = 1812 kmem_cache_create(timewait_sock_slab_name, 1813 prot->twsk_prot->twsk_obj_size, 1814 0, SLAB_HWCACHE_ALIGN, 1815 NULL); 1816 if (prot->twsk_prot->twsk_slab == NULL) 1817 goto out_free_timewait_sock_slab_name; 1818 } 1819 } 1820 1821 write_lock(&proto_list_lock); 1822 list_add(&prot->node, &proto_list); 1823 write_unlock(&proto_list_lock); 1824 rc = 0; 1825out: 1826 return rc; 1827out_free_timewait_sock_slab_name: 1828 kfree(timewait_sock_slab_name); 1829out_free_request_sock_slab: 1830 if (prot->rsk_prot && prot->rsk_prot->slab) { 1831 kmem_cache_destroy(prot->rsk_prot->slab); 1832 prot->rsk_prot->slab = NULL; 1833 } 1834out_free_request_sock_slab_name: 1835 kfree(request_sock_slab_name); 1836out_free_sock_slab: 1837 kmem_cache_destroy(prot->slab); 1838 prot->slab = NULL; 1839 goto out; 1840} 1841 1842EXPORT_SYMBOL(proto_register); 1843 1844void proto_unregister(struct proto *prot) 1845{ 1846 write_lock(&proto_list_lock); 1847 list_del(&prot->node); 1848 write_unlock(&proto_list_lock); 1849 1850 if (prot->slab != NULL) { 1851 kmem_cache_destroy(prot->slab); 1852 prot->slab = NULL; 1853 } 1854 1855 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1856 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1857 1858 kmem_cache_destroy(prot->rsk_prot->slab); 1859 kfree(name); 1860 prot->rsk_prot->slab = NULL; 1861 } 1862 1863 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1864 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1865 1866 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1867 kfree(name); 1868 prot->twsk_prot->twsk_slab = NULL; 1869 } 1870} 1871 1872EXPORT_SYMBOL(proto_unregister); 1873 1874#ifdef CONFIG_PROC_FS 1875static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1876{ 1877 read_lock(&proto_list_lock); 1878 return seq_list_start_head(&proto_list, *pos); 1879} 1880 1881static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1882{ 1883 return seq_list_next(v, &proto_list, pos); 1884} 1885 1886static void proto_seq_stop(struct seq_file *seq, void *v) 1887{ 1888 read_unlock(&proto_list_lock); 1889} 1890 1891static char proto_method_implemented(const void *method) 1892{ 1893 return method == NULL ? 'n' : 'y'; 1894} 1895 1896static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1897{ 1898 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1899 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1900 proto->name, 1901 proto->obj_size, 1902 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1903 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1904 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1905 proto->max_header, 1906 proto->slab == NULL ? "no" : "yes", 1907 module_name(proto->owner), 1908 proto_method_implemented(proto->close), 1909 proto_method_implemented(proto->connect), 1910 proto_method_implemented(proto->disconnect), 1911 proto_method_implemented(proto->accept), 1912 proto_method_implemented(proto->ioctl), 1913 proto_method_implemented(proto->init), 1914 proto_method_implemented(proto->destroy), 1915 proto_method_implemented(proto->shutdown), 1916 proto_method_implemented(proto->setsockopt), 1917 proto_method_implemented(proto->getsockopt), 1918 proto_method_implemented(proto->sendmsg), 1919 proto_method_implemented(proto->recvmsg), 1920 proto_method_implemented(proto->sendpage), 1921 proto_method_implemented(proto->bind), 1922 proto_method_implemented(proto->backlog_rcv), 1923 proto_method_implemented(proto->hash), 1924 proto_method_implemented(proto->unhash), 1925 proto_method_implemented(proto->get_port), 1926 proto_method_implemented(proto->enter_memory_pressure)); 1927} 1928 1929static int proto_seq_show(struct seq_file *seq, void *v) 1930{ 1931 if (v == &proto_list) 1932 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1933 "protocol", 1934 "size", 1935 "sockets", 1936 "memory", 1937 "press", 1938 "maxhdr", 1939 "slab", 1940 "module", 1941 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1942 else 1943 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1944 return 0; 1945} 1946 1947static const struct seq_operations proto_seq_ops = { 1948 .start = proto_seq_start, 1949 .next = proto_seq_next, 1950 .stop = proto_seq_stop, 1951 .show = proto_seq_show, 1952}; 1953 1954static int proto_seq_open(struct inode *inode, struct file *file) 1955{ 1956 return seq_open(file, &proto_seq_ops); 1957} 1958 1959static const struct file_operations proto_seq_fops = { 1960 .owner = THIS_MODULE, 1961 .open = proto_seq_open, 1962 .read = seq_read, 1963 .llseek = seq_lseek, 1964 .release = seq_release, 1965}; 1966 1967static int __init proto_init(void) 1968{ 1969 /* register /proc/net/protocols */ 1970 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1971} 1972 1973subsys_initcall(proto_init); 1974 1975#endif /* PROC_FS */ 1976 1977EXPORT_SYMBOL(sk_alloc); 1978EXPORT_SYMBOL(sk_free); 1979EXPORT_SYMBOL(sk_send_sigurg); 1980EXPORT_SYMBOL(sock_alloc_send_skb); 1981EXPORT_SYMBOL(sock_init_data); 1982EXPORT_SYMBOL(sock_kfree_s); 1983EXPORT_SYMBOL(sock_kmalloc); 1984EXPORT_SYMBOL(sock_no_accept); 1985EXPORT_SYMBOL(sock_no_bind); 1986EXPORT_SYMBOL(sock_no_connect); 1987EXPORT_SYMBOL(sock_no_getname); 1988EXPORT_SYMBOL(sock_no_getsockopt); 1989EXPORT_SYMBOL(sock_no_ioctl); 1990EXPORT_SYMBOL(sock_no_listen); 1991EXPORT_SYMBOL(sock_no_mmap); 1992EXPORT_SYMBOL(sock_no_poll); 1993EXPORT_SYMBOL(sock_no_recvmsg); 1994EXPORT_SYMBOL(sock_no_sendmsg); 1995EXPORT_SYMBOL(sock_no_sendpage); 1996EXPORT_SYMBOL(sock_no_setsockopt); 1997EXPORT_SYMBOL(sock_no_shutdown); 1998EXPORT_SYMBOL(sock_no_socketpair); 1999EXPORT_SYMBOL(sock_rfree); 2000EXPORT_SYMBOL(sock_setsockopt); 2001EXPORT_SYMBOL(sock_wfree); 2002EXPORT_SYMBOL(sock_wmalloc); 2003EXPORT_SYMBOL(sock_i_uid); 2004EXPORT_SYMBOL(sock_i_ino); 2005EXPORT_SYMBOL(sysctl_optmem_max); 2006#ifdef CONFIG_SYSCTL 2007EXPORT_SYMBOL(sysctl_rmem_max); 2008EXPORT_SYMBOL(sysctl_wmem_max); 2009#endif 2010