sock.c revision e51f802babc5e368c60fbfd08c6c11269c9253b0
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/request_sock.h> 123#include <net/sock.h> 124#include <net/xfrm.h> 125#include <linux/ipsec.h> 126 127#include <linux/filter.h> 128 129#ifdef CONFIG_INET 130#include <net/tcp.h> 131#endif 132 133/* 134 * Each address family might have different locking rules, so we have 135 * one slock key per address family: 136 */ 137static struct lock_class_key af_family_keys[AF_MAX]; 138static struct lock_class_key af_family_slock_keys[AF_MAX]; 139 140#ifdef CONFIG_DEBUG_LOCK_ALLOC 141/* 142 * Make lock validator output more readable. (we pre-construct these 143 * strings build-time, so that runtime initialization of socket 144 * locks is fast): 145 */ 146static const char *af_family_key_strings[AF_MAX+1] = { 147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 154 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 156 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" , 157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 158 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX" 159}; 160static const char *af_family_slock_key_strings[AF_MAX+1] = { 161 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 162 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 163 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 164 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 165 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 166 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 167 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 168 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 169 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 170 "slock-27" , "slock-28" , "slock-29" , 171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 172 "slock-AF_RXRPC" , "slock-AF_MAX" 173}; 174static const char *af_family_clock_key_strings[AF_MAX+1] = { 175 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 176 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 177 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 178 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 179 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 180 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 181 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 182 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , 183 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 184 "clock-27" , "clock-28" , "clock-29" , 185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 186 "clock-AF_RXRPC" , "clock-AF_MAX" 187}; 188#endif 189 190/* 191 * sk_callback_lock locking rules are per-address-family, 192 * so split the lock classes by using a per-AF key: 193 */ 194static struct lock_class_key af_callback_keys[AF_MAX]; 195 196/* Take into consideration the size of the struct sk_buff overhead in the 197 * determination of these values, since that is non-constant across 198 * platforms. This makes socket queueing behavior and performance 199 * not depend upon such differences. 200 */ 201#define _SK_MEM_PACKETS 256 202#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 203#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 204#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 205 206/* Run time adjustable parameters. */ 207__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 208__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 209__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 210__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 211 212/* Maximal space eaten by iovec or ancilliary data plus some space */ 213int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 214 215static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 216{ 217 struct timeval tv; 218 219 if (optlen < sizeof(tv)) 220 return -EINVAL; 221 if (copy_from_user(&tv, optval, sizeof(tv))) 222 return -EFAULT; 223 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 224 return -EDOM; 225 226 if (tv.tv_sec < 0) { 227 static int warned __read_mostly; 228 229 *timeo_p = 0; 230 if (warned < 10 && net_ratelimit()) 231 warned++; 232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 233 "tries to set negative timeout\n", 234 current->comm, current->pid); 235 return 0; 236 } 237 *timeo_p = MAX_SCHEDULE_TIMEOUT; 238 if (tv.tv_sec == 0 && tv.tv_usec == 0) 239 return 0; 240 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 241 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 242 return 0; 243} 244 245static void sock_warn_obsolete_bsdism(const char *name) 246{ 247 static int warned; 248 static char warncomm[TASK_COMM_LEN]; 249 if (strcmp(warncomm, current->comm) && warned < 5) { 250 strcpy(warncomm, current->comm); 251 printk(KERN_WARNING "process `%s' is using obsolete " 252 "%s SO_BSDCOMPAT\n", warncomm, name); 253 warned++; 254 } 255} 256 257static void sock_disable_timestamp(struct sock *sk) 258{ 259 if (sock_flag(sk, SOCK_TIMESTAMP)) { 260 sock_reset_flag(sk, SOCK_TIMESTAMP); 261 net_disable_timestamp(); 262 } 263} 264 265 266int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 267{ 268 int err = 0; 269 int skb_len; 270 271 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 272 number of warnings when compiling with -W --ANK 273 */ 274 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 275 (unsigned)sk->sk_rcvbuf) { 276 err = -ENOMEM; 277 goto out; 278 } 279 280 err = sk_filter(sk, skb); 281 if (err) 282 goto out; 283 284 skb->dev = NULL; 285 skb_set_owner_r(skb, sk); 286 287 /* Cache the SKB length before we tack it onto the receive 288 * queue. Once it is added it no longer belongs to us and 289 * may be freed by other threads of control pulling packets 290 * from the queue. 291 */ 292 skb_len = skb->len; 293 294 skb_queue_tail(&sk->sk_receive_queue, skb); 295 296 if (!sock_flag(sk, SOCK_DEAD)) 297 sk->sk_data_ready(sk, skb_len); 298out: 299 return err; 300} 301EXPORT_SYMBOL(sock_queue_rcv_skb); 302 303int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 304{ 305 int rc = NET_RX_SUCCESS; 306 307 if (sk_filter(sk, skb)) 308 goto discard_and_relse; 309 310 skb->dev = NULL; 311 312 if (nested) 313 bh_lock_sock_nested(sk); 314 else 315 bh_lock_sock(sk); 316 if (!sock_owned_by_user(sk)) { 317 /* 318 * trylock + unlock semantics: 319 */ 320 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 321 322 rc = sk->sk_backlog_rcv(sk, skb); 323 324 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 325 } else 326 sk_add_backlog(sk, skb); 327 bh_unlock_sock(sk); 328out: 329 sock_put(sk); 330 return rc; 331discard_and_relse: 332 kfree_skb(skb); 333 goto out; 334} 335EXPORT_SYMBOL(sk_receive_skb); 336 337struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 338{ 339 struct dst_entry *dst = sk->sk_dst_cache; 340 341 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 342 sk->sk_dst_cache = NULL; 343 dst_release(dst); 344 return NULL; 345 } 346 347 return dst; 348} 349EXPORT_SYMBOL(__sk_dst_check); 350 351struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 352{ 353 struct dst_entry *dst = sk_dst_get(sk); 354 355 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 356 sk_dst_reset(sk); 357 dst_release(dst); 358 return NULL; 359 } 360 361 return dst; 362} 363EXPORT_SYMBOL(sk_dst_check); 364 365/* 366 * This is meant for all protocols to use and covers goings on 367 * at the socket level. Everything here is generic. 368 */ 369 370int sock_setsockopt(struct socket *sock, int level, int optname, 371 char __user *optval, int optlen) 372{ 373 struct sock *sk=sock->sk; 374 struct sk_filter *filter; 375 int val; 376 int valbool; 377 struct linger ling; 378 int ret = 0; 379 380 /* 381 * Options without arguments 382 */ 383 384#ifdef SO_DONTLINGER /* Compatibility item... */ 385 if (optname == SO_DONTLINGER) { 386 lock_sock(sk); 387 sock_reset_flag(sk, SOCK_LINGER); 388 release_sock(sk); 389 return 0; 390 } 391#endif 392 393 if (optlen < sizeof(int)) 394 return -EINVAL; 395 396 if (get_user(val, (int __user *)optval)) 397 return -EFAULT; 398 399 valbool = val?1:0; 400 401 lock_sock(sk); 402 403 switch(optname) { 404 case SO_DEBUG: 405 if (val && !capable(CAP_NET_ADMIN)) { 406 ret = -EACCES; 407 } 408 else if (valbool) 409 sock_set_flag(sk, SOCK_DBG); 410 else 411 sock_reset_flag(sk, SOCK_DBG); 412 break; 413 case SO_REUSEADDR: 414 sk->sk_reuse = valbool; 415 break; 416 case SO_TYPE: 417 case SO_ERROR: 418 ret = -ENOPROTOOPT; 419 break; 420 case SO_DONTROUTE: 421 if (valbool) 422 sock_set_flag(sk, SOCK_LOCALROUTE); 423 else 424 sock_reset_flag(sk, SOCK_LOCALROUTE); 425 break; 426 case SO_BROADCAST: 427 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 428 break; 429 case SO_SNDBUF: 430 /* Don't error on this BSD doesn't and if you think 431 about it this is right. Otherwise apps have to 432 play 'guess the biggest size' games. RCVBUF/SNDBUF 433 are treated in BSD as hints */ 434 435 if (val > sysctl_wmem_max) 436 val = sysctl_wmem_max; 437set_sndbuf: 438 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 439 if ((val * 2) < SOCK_MIN_SNDBUF) 440 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 441 else 442 sk->sk_sndbuf = val * 2; 443 444 /* 445 * Wake up sending tasks if we 446 * upped the value. 447 */ 448 sk->sk_write_space(sk); 449 break; 450 451 case SO_SNDBUFFORCE: 452 if (!capable(CAP_NET_ADMIN)) { 453 ret = -EPERM; 454 break; 455 } 456 goto set_sndbuf; 457 458 case SO_RCVBUF: 459 /* Don't error on this BSD doesn't and if you think 460 about it this is right. Otherwise apps have to 461 play 'guess the biggest size' games. RCVBUF/SNDBUF 462 are treated in BSD as hints */ 463 464 if (val > sysctl_rmem_max) 465 val = sysctl_rmem_max; 466set_rcvbuf: 467 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 468 /* 469 * We double it on the way in to account for 470 * "struct sk_buff" etc. overhead. Applications 471 * assume that the SO_RCVBUF setting they make will 472 * allow that much actual data to be received on that 473 * socket. 474 * 475 * Applications are unaware that "struct sk_buff" and 476 * other overheads allocate from the receive buffer 477 * during socket buffer allocation. 478 * 479 * And after considering the possible alternatives, 480 * returning the value we actually used in getsockopt 481 * is the most desirable behavior. 482 */ 483 if ((val * 2) < SOCK_MIN_RCVBUF) 484 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 485 else 486 sk->sk_rcvbuf = val * 2; 487 break; 488 489 case SO_RCVBUFFORCE: 490 if (!capable(CAP_NET_ADMIN)) { 491 ret = -EPERM; 492 break; 493 } 494 goto set_rcvbuf; 495 496 case SO_KEEPALIVE: 497#ifdef CONFIG_INET 498 if (sk->sk_protocol == IPPROTO_TCP) 499 tcp_set_keepalive(sk, valbool); 500#endif 501 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 502 break; 503 504 case SO_OOBINLINE: 505 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 506 break; 507 508 case SO_NO_CHECK: 509 sk->sk_no_check = valbool; 510 break; 511 512 case SO_PRIORITY: 513 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 514 sk->sk_priority = val; 515 else 516 ret = -EPERM; 517 break; 518 519 case SO_LINGER: 520 if (optlen < sizeof(ling)) { 521 ret = -EINVAL; /* 1003.1g */ 522 break; 523 } 524 if (copy_from_user(&ling,optval,sizeof(ling))) { 525 ret = -EFAULT; 526 break; 527 } 528 if (!ling.l_onoff) 529 sock_reset_flag(sk, SOCK_LINGER); 530 else { 531#if (BITS_PER_LONG == 32) 532 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 533 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 534 else 535#endif 536 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 537 sock_set_flag(sk, SOCK_LINGER); 538 } 539 break; 540 541 case SO_BSDCOMPAT: 542 sock_warn_obsolete_bsdism("setsockopt"); 543 break; 544 545 case SO_PASSCRED: 546 if (valbool) 547 set_bit(SOCK_PASSCRED, &sock->flags); 548 else 549 clear_bit(SOCK_PASSCRED, &sock->flags); 550 break; 551 552 case SO_TIMESTAMP: 553 case SO_TIMESTAMPNS: 554 if (valbool) { 555 if (optname == SO_TIMESTAMP) 556 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 557 else 558 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 559 sock_set_flag(sk, SOCK_RCVTSTAMP); 560 sock_enable_timestamp(sk); 561 } else { 562 sock_reset_flag(sk, SOCK_RCVTSTAMP); 563 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 564 } 565 break; 566 567 case SO_RCVLOWAT: 568 if (val < 0) 569 val = INT_MAX; 570 sk->sk_rcvlowat = val ? : 1; 571 break; 572 573 case SO_RCVTIMEO: 574 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 575 break; 576 577 case SO_SNDTIMEO: 578 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 579 break; 580 581#ifdef CONFIG_NETDEVICES 582 case SO_BINDTODEVICE: 583 { 584 char devname[IFNAMSIZ]; 585 586 /* Sorry... */ 587 if (!capable(CAP_NET_RAW)) { 588 ret = -EPERM; 589 break; 590 } 591 592 /* Bind this socket to a particular device like "eth0", 593 * as specified in the passed interface name. If the 594 * name is "" or the option length is zero the socket 595 * is not bound. 596 */ 597 598 if (!valbool) { 599 sk->sk_bound_dev_if = 0; 600 } else { 601 if (optlen > IFNAMSIZ - 1) 602 optlen = IFNAMSIZ - 1; 603 memset(devname, 0, sizeof(devname)); 604 if (copy_from_user(devname, optval, optlen)) { 605 ret = -EFAULT; 606 break; 607 } 608 609 /* Remove any cached route for this socket. */ 610 sk_dst_reset(sk); 611 612 if (devname[0] == '\0') { 613 sk->sk_bound_dev_if = 0; 614 } else { 615 struct net_device *dev = dev_get_by_name(devname); 616 if (!dev) { 617 ret = -ENODEV; 618 break; 619 } 620 sk->sk_bound_dev_if = dev->ifindex; 621 dev_put(dev); 622 } 623 } 624 break; 625 } 626#endif 627 628 629 case SO_ATTACH_FILTER: 630 ret = -EINVAL; 631 if (optlen == sizeof(struct sock_fprog)) { 632 struct sock_fprog fprog; 633 634 ret = -EFAULT; 635 if (copy_from_user(&fprog, optval, sizeof(fprog))) 636 break; 637 638 ret = sk_attach_filter(&fprog, sk); 639 } 640 break; 641 642 case SO_DETACH_FILTER: 643 rcu_read_lock_bh(); 644 filter = rcu_dereference(sk->sk_filter); 645 if (filter) { 646 rcu_assign_pointer(sk->sk_filter, NULL); 647 sk_filter_release(sk, filter); 648 rcu_read_unlock_bh(); 649 break; 650 } 651 rcu_read_unlock_bh(); 652 ret = -ENONET; 653 break; 654 655 case SO_PASSSEC: 656 if (valbool) 657 set_bit(SOCK_PASSSEC, &sock->flags); 658 else 659 clear_bit(SOCK_PASSSEC, &sock->flags); 660 break; 661 662 /* We implement the SO_SNDLOWAT etc to 663 not be settable (1003.1g 5.3) */ 664 default: 665 ret = -ENOPROTOOPT; 666 break; 667 } 668 release_sock(sk); 669 return ret; 670} 671 672 673int sock_getsockopt(struct socket *sock, int level, int optname, 674 char __user *optval, int __user *optlen) 675{ 676 struct sock *sk = sock->sk; 677 678 union { 679 int val; 680 struct linger ling; 681 struct timeval tm; 682 } v; 683 684 unsigned int lv = sizeof(int); 685 int len; 686 687 if (get_user(len, optlen)) 688 return -EFAULT; 689 if (len < 0) 690 return -EINVAL; 691 692 switch(optname) { 693 case SO_DEBUG: 694 v.val = sock_flag(sk, SOCK_DBG); 695 break; 696 697 case SO_DONTROUTE: 698 v.val = sock_flag(sk, SOCK_LOCALROUTE); 699 break; 700 701 case SO_BROADCAST: 702 v.val = !!sock_flag(sk, SOCK_BROADCAST); 703 break; 704 705 case SO_SNDBUF: 706 v.val = sk->sk_sndbuf; 707 break; 708 709 case SO_RCVBUF: 710 v.val = sk->sk_rcvbuf; 711 break; 712 713 case SO_REUSEADDR: 714 v.val = sk->sk_reuse; 715 break; 716 717 case SO_KEEPALIVE: 718 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 719 break; 720 721 case SO_TYPE: 722 v.val = sk->sk_type; 723 break; 724 725 case SO_ERROR: 726 v.val = -sock_error(sk); 727 if (v.val==0) 728 v.val = xchg(&sk->sk_err_soft, 0); 729 break; 730 731 case SO_OOBINLINE: 732 v.val = !!sock_flag(sk, SOCK_URGINLINE); 733 break; 734 735 case SO_NO_CHECK: 736 v.val = sk->sk_no_check; 737 break; 738 739 case SO_PRIORITY: 740 v.val = sk->sk_priority; 741 break; 742 743 case SO_LINGER: 744 lv = sizeof(v.ling); 745 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 746 v.ling.l_linger = sk->sk_lingertime / HZ; 747 break; 748 749 case SO_BSDCOMPAT: 750 sock_warn_obsolete_bsdism("getsockopt"); 751 break; 752 753 case SO_TIMESTAMP: 754 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 755 !sock_flag(sk, SOCK_RCVTSTAMPNS); 756 break; 757 758 case SO_TIMESTAMPNS: 759 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 760 break; 761 762 case SO_RCVTIMEO: 763 lv=sizeof(struct timeval); 764 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 765 v.tm.tv_sec = 0; 766 v.tm.tv_usec = 0; 767 } else { 768 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 769 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 770 } 771 break; 772 773 case SO_SNDTIMEO: 774 lv=sizeof(struct timeval); 775 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 776 v.tm.tv_sec = 0; 777 v.tm.tv_usec = 0; 778 } else { 779 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 780 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 781 } 782 break; 783 784 case SO_RCVLOWAT: 785 v.val = sk->sk_rcvlowat; 786 break; 787 788 case SO_SNDLOWAT: 789 v.val=1; 790 break; 791 792 case SO_PASSCRED: 793 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 794 break; 795 796 case SO_PEERCRED: 797 if (len > sizeof(sk->sk_peercred)) 798 len = sizeof(sk->sk_peercred); 799 if (copy_to_user(optval, &sk->sk_peercred, len)) 800 return -EFAULT; 801 goto lenout; 802 803 case SO_PEERNAME: 804 { 805 char address[128]; 806 807 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 808 return -ENOTCONN; 809 if (lv < len) 810 return -EINVAL; 811 if (copy_to_user(optval, address, len)) 812 return -EFAULT; 813 goto lenout; 814 } 815 816 /* Dubious BSD thing... Probably nobody even uses it, but 817 * the UNIX standard wants it for whatever reason... -DaveM 818 */ 819 case SO_ACCEPTCONN: 820 v.val = sk->sk_state == TCP_LISTEN; 821 break; 822 823 case SO_PASSSEC: 824 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 825 break; 826 827 case SO_PEERSEC: 828 return security_socket_getpeersec_stream(sock, optval, optlen, len); 829 830 default: 831 return -ENOPROTOOPT; 832 } 833 834 if (len > lv) 835 len = lv; 836 if (copy_to_user(optval, &v, len)) 837 return -EFAULT; 838lenout: 839 if (put_user(len, optlen)) 840 return -EFAULT; 841 return 0; 842} 843 844/* 845 * Initialize an sk_lock. 846 * 847 * (We also register the sk_lock with the lock validator.) 848 */ 849static inline void sock_lock_init(struct sock *sk) 850{ 851 sock_lock_init_class_and_name(sk, 852 af_family_slock_key_strings[sk->sk_family], 853 af_family_slock_keys + sk->sk_family, 854 af_family_key_strings[sk->sk_family], 855 af_family_keys + sk->sk_family); 856} 857 858/** 859 * sk_alloc - All socket objects are allocated here 860 * @family: protocol family 861 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 862 * @prot: struct proto associated with this new sock instance 863 * @zero_it: if we should zero the newly allocated sock 864 */ 865struct sock *sk_alloc(int family, gfp_t priority, 866 struct proto *prot, int zero_it) 867{ 868 struct sock *sk = NULL; 869 struct kmem_cache *slab = prot->slab; 870 871 if (slab != NULL) 872 sk = kmem_cache_alloc(slab, priority); 873 else 874 sk = kmalloc(prot->obj_size, priority); 875 876 if (sk) { 877 if (zero_it) { 878 memset(sk, 0, prot->obj_size); 879 sk->sk_family = family; 880 /* 881 * See comment in struct sock definition to understand 882 * why we need sk_prot_creator -acme 883 */ 884 sk->sk_prot = sk->sk_prot_creator = prot; 885 sock_lock_init(sk); 886 } 887 888 if (security_sk_alloc(sk, family, priority)) 889 goto out_free; 890 891 if (!try_module_get(prot->owner)) 892 goto out_free; 893 } 894 return sk; 895 896out_free: 897 if (slab != NULL) 898 kmem_cache_free(slab, sk); 899 else 900 kfree(sk); 901 return NULL; 902} 903 904void sk_free(struct sock *sk) 905{ 906 struct sk_filter *filter; 907 struct module *owner = sk->sk_prot_creator->owner; 908 909 if (sk->sk_destruct) 910 sk->sk_destruct(sk); 911 912 filter = rcu_dereference(sk->sk_filter); 913 if (filter) { 914 sk_filter_release(sk, filter); 915 rcu_assign_pointer(sk->sk_filter, NULL); 916 } 917 918 sock_disable_timestamp(sk); 919 920 if (atomic_read(&sk->sk_omem_alloc)) 921 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 922 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 923 924 security_sk_free(sk); 925 if (sk->sk_prot_creator->slab != NULL) 926 kmem_cache_free(sk->sk_prot_creator->slab, sk); 927 else 928 kfree(sk); 929 module_put(owner); 930} 931 932struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 933{ 934 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); 935 936 if (newsk != NULL) { 937 struct sk_filter *filter; 938 939 sock_copy(newsk, sk); 940 941 /* SANITY */ 942 sk_node_init(&newsk->sk_node); 943 sock_lock_init(newsk); 944 bh_lock_sock(newsk); 945 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 946 947 atomic_set(&newsk->sk_rmem_alloc, 0); 948 atomic_set(&newsk->sk_wmem_alloc, 0); 949 atomic_set(&newsk->sk_omem_alloc, 0); 950 skb_queue_head_init(&newsk->sk_receive_queue); 951 skb_queue_head_init(&newsk->sk_write_queue); 952#ifdef CONFIG_NET_DMA 953 skb_queue_head_init(&newsk->sk_async_wait_queue); 954#endif 955 956 rwlock_init(&newsk->sk_dst_lock); 957 rwlock_init(&newsk->sk_callback_lock); 958 lockdep_set_class_and_name(&newsk->sk_callback_lock, 959 af_callback_keys + newsk->sk_family, 960 af_family_clock_key_strings[newsk->sk_family]); 961 962 newsk->sk_dst_cache = NULL; 963 newsk->sk_wmem_queued = 0; 964 newsk->sk_forward_alloc = 0; 965 newsk->sk_send_head = NULL; 966 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 967 968 sock_reset_flag(newsk, SOCK_DONE); 969 skb_queue_head_init(&newsk->sk_error_queue); 970 971 filter = newsk->sk_filter; 972 if (filter != NULL) 973 sk_filter_charge(newsk, filter); 974 975 if (unlikely(xfrm_sk_clone_policy(newsk))) { 976 /* It is still raw copy of parent, so invalidate 977 * destructor and make plain sk_free() */ 978 newsk->sk_destruct = NULL; 979 sk_free(newsk); 980 newsk = NULL; 981 goto out; 982 } 983 984 newsk->sk_err = 0; 985 newsk->sk_priority = 0; 986 atomic_set(&newsk->sk_refcnt, 2); 987 988 /* 989 * Increment the counter in the same struct proto as the master 990 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 991 * is the same as sk->sk_prot->socks, as this field was copied 992 * with memcpy). 993 * 994 * This _changes_ the previous behaviour, where 995 * tcp_create_openreq_child always was incrementing the 996 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 997 * to be taken into account in all callers. -acme 998 */ 999 sk_refcnt_debug_inc(newsk); 1000 newsk->sk_socket = NULL; 1001 newsk->sk_sleep = NULL; 1002 1003 if (newsk->sk_prot->sockets_allocated) 1004 atomic_inc(newsk->sk_prot->sockets_allocated); 1005 } 1006out: 1007 return newsk; 1008} 1009 1010EXPORT_SYMBOL_GPL(sk_clone); 1011 1012void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1013{ 1014 __sk_dst_set(sk, dst); 1015 sk->sk_route_caps = dst->dev->features; 1016 if (sk->sk_route_caps & NETIF_F_GSO) 1017 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1018 if (sk_can_gso(sk)) { 1019 if (dst->header_len) 1020 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1021 else 1022 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1023 } 1024} 1025EXPORT_SYMBOL_GPL(sk_setup_caps); 1026 1027void __init sk_init(void) 1028{ 1029 if (num_physpages <= 4096) { 1030 sysctl_wmem_max = 32767; 1031 sysctl_rmem_max = 32767; 1032 sysctl_wmem_default = 32767; 1033 sysctl_rmem_default = 32767; 1034 } else if (num_physpages >= 131072) { 1035 sysctl_wmem_max = 131071; 1036 sysctl_rmem_max = 131071; 1037 } 1038} 1039 1040/* 1041 * Simple resource managers for sockets. 1042 */ 1043 1044 1045/* 1046 * Write buffer destructor automatically called from kfree_skb. 1047 */ 1048void sock_wfree(struct sk_buff *skb) 1049{ 1050 struct sock *sk = skb->sk; 1051 1052 /* In case it might be waiting for more memory. */ 1053 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1054 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1055 sk->sk_write_space(sk); 1056 sock_put(sk); 1057} 1058 1059/* 1060 * Read buffer destructor automatically called from kfree_skb. 1061 */ 1062void sock_rfree(struct sk_buff *skb) 1063{ 1064 struct sock *sk = skb->sk; 1065 1066 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1067} 1068 1069 1070int sock_i_uid(struct sock *sk) 1071{ 1072 int uid; 1073 1074 read_lock(&sk->sk_callback_lock); 1075 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1076 read_unlock(&sk->sk_callback_lock); 1077 return uid; 1078} 1079 1080unsigned long sock_i_ino(struct sock *sk) 1081{ 1082 unsigned long ino; 1083 1084 read_lock(&sk->sk_callback_lock); 1085 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1086 read_unlock(&sk->sk_callback_lock); 1087 return ino; 1088} 1089 1090/* 1091 * Allocate a skb from the socket's send buffer. 1092 */ 1093struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1094 gfp_t priority) 1095{ 1096 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1097 struct sk_buff * skb = alloc_skb(size, priority); 1098 if (skb) { 1099 skb_set_owner_w(skb, sk); 1100 return skb; 1101 } 1102 } 1103 return NULL; 1104} 1105 1106/* 1107 * Allocate a skb from the socket's receive buffer. 1108 */ 1109struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1110 gfp_t priority) 1111{ 1112 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1113 struct sk_buff *skb = alloc_skb(size, priority); 1114 if (skb) { 1115 skb_set_owner_r(skb, sk); 1116 return skb; 1117 } 1118 } 1119 return NULL; 1120} 1121 1122/* 1123 * Allocate a memory block from the socket's option memory buffer. 1124 */ 1125void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1126{ 1127 if ((unsigned)size <= sysctl_optmem_max && 1128 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1129 void *mem; 1130 /* First do the add, to avoid the race if kmalloc 1131 * might sleep. 1132 */ 1133 atomic_add(size, &sk->sk_omem_alloc); 1134 mem = kmalloc(size, priority); 1135 if (mem) 1136 return mem; 1137 atomic_sub(size, &sk->sk_omem_alloc); 1138 } 1139 return NULL; 1140} 1141 1142/* 1143 * Free an option memory block. 1144 */ 1145void sock_kfree_s(struct sock *sk, void *mem, int size) 1146{ 1147 kfree(mem); 1148 atomic_sub(size, &sk->sk_omem_alloc); 1149} 1150 1151/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1152 I think, these locks should be removed for datagram sockets. 1153 */ 1154static long sock_wait_for_wmem(struct sock * sk, long timeo) 1155{ 1156 DEFINE_WAIT(wait); 1157 1158 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1159 for (;;) { 1160 if (!timeo) 1161 break; 1162 if (signal_pending(current)) 1163 break; 1164 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1165 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1166 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1167 break; 1168 if (sk->sk_shutdown & SEND_SHUTDOWN) 1169 break; 1170 if (sk->sk_err) 1171 break; 1172 timeo = schedule_timeout(timeo); 1173 } 1174 finish_wait(sk->sk_sleep, &wait); 1175 return timeo; 1176} 1177 1178 1179/* 1180 * Generic send/receive buffer handlers 1181 */ 1182 1183static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1184 unsigned long header_len, 1185 unsigned long data_len, 1186 int noblock, int *errcode) 1187{ 1188 struct sk_buff *skb; 1189 gfp_t gfp_mask; 1190 long timeo; 1191 int err; 1192 1193 gfp_mask = sk->sk_allocation; 1194 if (gfp_mask & __GFP_WAIT) 1195 gfp_mask |= __GFP_REPEAT; 1196 1197 timeo = sock_sndtimeo(sk, noblock); 1198 while (1) { 1199 err = sock_error(sk); 1200 if (err != 0) 1201 goto failure; 1202 1203 err = -EPIPE; 1204 if (sk->sk_shutdown & SEND_SHUTDOWN) 1205 goto failure; 1206 1207 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1208 skb = alloc_skb(header_len, gfp_mask); 1209 if (skb) { 1210 int npages; 1211 int i; 1212 1213 /* No pages, we're done... */ 1214 if (!data_len) 1215 break; 1216 1217 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1218 skb->truesize += data_len; 1219 skb_shinfo(skb)->nr_frags = npages; 1220 for (i = 0; i < npages; i++) { 1221 struct page *page; 1222 skb_frag_t *frag; 1223 1224 page = alloc_pages(sk->sk_allocation, 0); 1225 if (!page) { 1226 err = -ENOBUFS; 1227 skb_shinfo(skb)->nr_frags = i; 1228 kfree_skb(skb); 1229 goto failure; 1230 } 1231 1232 frag = &skb_shinfo(skb)->frags[i]; 1233 frag->page = page; 1234 frag->page_offset = 0; 1235 frag->size = (data_len >= PAGE_SIZE ? 1236 PAGE_SIZE : 1237 data_len); 1238 data_len -= PAGE_SIZE; 1239 } 1240 1241 /* Full success... */ 1242 break; 1243 } 1244 err = -ENOBUFS; 1245 goto failure; 1246 } 1247 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1248 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1249 err = -EAGAIN; 1250 if (!timeo) 1251 goto failure; 1252 if (signal_pending(current)) 1253 goto interrupted; 1254 timeo = sock_wait_for_wmem(sk, timeo); 1255 } 1256 1257 skb_set_owner_w(skb, sk); 1258 return skb; 1259 1260interrupted: 1261 err = sock_intr_errno(timeo); 1262failure: 1263 *errcode = err; 1264 return NULL; 1265} 1266 1267struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1268 int noblock, int *errcode) 1269{ 1270 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1271} 1272 1273static void __lock_sock(struct sock *sk) 1274{ 1275 DEFINE_WAIT(wait); 1276 1277 for (;;) { 1278 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1279 TASK_UNINTERRUPTIBLE); 1280 spin_unlock_bh(&sk->sk_lock.slock); 1281 schedule(); 1282 spin_lock_bh(&sk->sk_lock.slock); 1283 if (!sock_owned_by_user(sk)) 1284 break; 1285 } 1286 finish_wait(&sk->sk_lock.wq, &wait); 1287} 1288 1289static void __release_sock(struct sock *sk) 1290{ 1291 struct sk_buff *skb = sk->sk_backlog.head; 1292 1293 do { 1294 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1295 bh_unlock_sock(sk); 1296 1297 do { 1298 struct sk_buff *next = skb->next; 1299 1300 skb->next = NULL; 1301 sk->sk_backlog_rcv(sk, skb); 1302 1303 /* 1304 * We are in process context here with softirqs 1305 * disabled, use cond_resched_softirq() to preempt. 1306 * This is safe to do because we've taken the backlog 1307 * queue private: 1308 */ 1309 cond_resched_softirq(); 1310 1311 skb = next; 1312 } while (skb != NULL); 1313 1314 bh_lock_sock(sk); 1315 } while ((skb = sk->sk_backlog.head) != NULL); 1316} 1317 1318/** 1319 * sk_wait_data - wait for data to arrive at sk_receive_queue 1320 * @sk: sock to wait on 1321 * @timeo: for how long 1322 * 1323 * Now socket state including sk->sk_err is changed only under lock, 1324 * hence we may omit checks after joining wait queue. 1325 * We check receive queue before schedule() only as optimization; 1326 * it is very likely that release_sock() added new data. 1327 */ 1328int sk_wait_data(struct sock *sk, long *timeo) 1329{ 1330 int rc; 1331 DEFINE_WAIT(wait); 1332 1333 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1334 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1335 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1336 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1337 finish_wait(sk->sk_sleep, &wait); 1338 return rc; 1339} 1340 1341EXPORT_SYMBOL(sk_wait_data); 1342 1343/* 1344 * Set of default routines for initialising struct proto_ops when 1345 * the protocol does not support a particular function. In certain 1346 * cases where it makes no sense for a protocol to have a "do nothing" 1347 * function, some default processing is provided. 1348 */ 1349 1350int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1351{ 1352 return -EOPNOTSUPP; 1353} 1354 1355int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1356 int len, int flags) 1357{ 1358 return -EOPNOTSUPP; 1359} 1360 1361int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1362{ 1363 return -EOPNOTSUPP; 1364} 1365 1366int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1367{ 1368 return -EOPNOTSUPP; 1369} 1370 1371int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1372 int *len, int peer) 1373{ 1374 return -EOPNOTSUPP; 1375} 1376 1377unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1378{ 1379 return 0; 1380} 1381 1382int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1383{ 1384 return -EOPNOTSUPP; 1385} 1386 1387int sock_no_listen(struct socket *sock, int backlog) 1388{ 1389 return -EOPNOTSUPP; 1390} 1391 1392int sock_no_shutdown(struct socket *sock, int how) 1393{ 1394 return -EOPNOTSUPP; 1395} 1396 1397int sock_no_setsockopt(struct socket *sock, int level, int optname, 1398 char __user *optval, int optlen) 1399{ 1400 return -EOPNOTSUPP; 1401} 1402 1403int sock_no_getsockopt(struct socket *sock, int level, int optname, 1404 char __user *optval, int __user *optlen) 1405{ 1406 return -EOPNOTSUPP; 1407} 1408 1409int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1410 size_t len) 1411{ 1412 return -EOPNOTSUPP; 1413} 1414 1415int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1416 size_t len, int flags) 1417{ 1418 return -EOPNOTSUPP; 1419} 1420 1421int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1422{ 1423 /* Mirror missing mmap method error code */ 1424 return -ENODEV; 1425} 1426 1427ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1428{ 1429 ssize_t res; 1430 struct msghdr msg = {.msg_flags = flags}; 1431 struct kvec iov; 1432 char *kaddr = kmap(page); 1433 iov.iov_base = kaddr + offset; 1434 iov.iov_len = size; 1435 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1436 kunmap(page); 1437 return res; 1438} 1439 1440/* 1441 * Default Socket Callbacks 1442 */ 1443 1444static void sock_def_wakeup(struct sock *sk) 1445{ 1446 read_lock(&sk->sk_callback_lock); 1447 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1448 wake_up_interruptible_all(sk->sk_sleep); 1449 read_unlock(&sk->sk_callback_lock); 1450} 1451 1452static void sock_def_error_report(struct sock *sk) 1453{ 1454 read_lock(&sk->sk_callback_lock); 1455 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1456 wake_up_interruptible(sk->sk_sleep); 1457 sk_wake_async(sk,0,POLL_ERR); 1458 read_unlock(&sk->sk_callback_lock); 1459} 1460 1461static void sock_def_readable(struct sock *sk, int len) 1462{ 1463 read_lock(&sk->sk_callback_lock); 1464 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1465 wake_up_interruptible(sk->sk_sleep); 1466 sk_wake_async(sk,1,POLL_IN); 1467 read_unlock(&sk->sk_callback_lock); 1468} 1469 1470static void sock_def_write_space(struct sock *sk) 1471{ 1472 read_lock(&sk->sk_callback_lock); 1473 1474 /* Do not wake up a writer until he can make "significant" 1475 * progress. --DaveM 1476 */ 1477 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1478 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1479 wake_up_interruptible(sk->sk_sleep); 1480 1481 /* Should agree with poll, otherwise some programs break */ 1482 if (sock_writeable(sk)) 1483 sk_wake_async(sk, 2, POLL_OUT); 1484 } 1485 1486 read_unlock(&sk->sk_callback_lock); 1487} 1488 1489static void sock_def_destruct(struct sock *sk) 1490{ 1491 kfree(sk->sk_protinfo); 1492} 1493 1494void sk_send_sigurg(struct sock *sk) 1495{ 1496 if (sk->sk_socket && sk->sk_socket->file) 1497 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1498 sk_wake_async(sk, 3, POLL_PRI); 1499} 1500 1501void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1502 unsigned long expires) 1503{ 1504 if (!mod_timer(timer, expires)) 1505 sock_hold(sk); 1506} 1507 1508EXPORT_SYMBOL(sk_reset_timer); 1509 1510void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1511{ 1512 if (timer_pending(timer) && del_timer(timer)) 1513 __sock_put(sk); 1514} 1515 1516EXPORT_SYMBOL(sk_stop_timer); 1517 1518void sock_init_data(struct socket *sock, struct sock *sk) 1519{ 1520 skb_queue_head_init(&sk->sk_receive_queue); 1521 skb_queue_head_init(&sk->sk_write_queue); 1522 skb_queue_head_init(&sk->sk_error_queue); 1523#ifdef CONFIG_NET_DMA 1524 skb_queue_head_init(&sk->sk_async_wait_queue); 1525#endif 1526 1527 sk->sk_send_head = NULL; 1528 1529 init_timer(&sk->sk_timer); 1530 1531 sk->sk_allocation = GFP_KERNEL; 1532 sk->sk_rcvbuf = sysctl_rmem_default; 1533 sk->sk_sndbuf = sysctl_wmem_default; 1534 sk->sk_state = TCP_CLOSE; 1535 sk->sk_socket = sock; 1536 1537 sock_set_flag(sk, SOCK_ZAPPED); 1538 1539 if (sock) { 1540 sk->sk_type = sock->type; 1541 sk->sk_sleep = &sock->wait; 1542 sock->sk = sk; 1543 } else 1544 sk->sk_sleep = NULL; 1545 1546 rwlock_init(&sk->sk_dst_lock); 1547 rwlock_init(&sk->sk_callback_lock); 1548 lockdep_set_class_and_name(&sk->sk_callback_lock, 1549 af_callback_keys + sk->sk_family, 1550 af_family_clock_key_strings[sk->sk_family]); 1551 1552 sk->sk_state_change = sock_def_wakeup; 1553 sk->sk_data_ready = sock_def_readable; 1554 sk->sk_write_space = sock_def_write_space; 1555 sk->sk_error_report = sock_def_error_report; 1556 sk->sk_destruct = sock_def_destruct; 1557 1558 sk->sk_sndmsg_page = NULL; 1559 sk->sk_sndmsg_off = 0; 1560 1561 sk->sk_peercred.pid = 0; 1562 sk->sk_peercred.uid = -1; 1563 sk->sk_peercred.gid = -1; 1564 sk->sk_write_pending = 0; 1565 sk->sk_rcvlowat = 1; 1566 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1567 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1568 1569 sk->sk_stamp = ktime_set(-1L, -1L); 1570 1571 atomic_set(&sk->sk_refcnt, 1); 1572} 1573 1574void fastcall lock_sock_nested(struct sock *sk, int subclass) 1575{ 1576 might_sleep(); 1577 spin_lock_bh(&sk->sk_lock.slock); 1578 if (sk->sk_lock.owner) 1579 __lock_sock(sk); 1580 sk->sk_lock.owner = (void *)1; 1581 spin_unlock(&sk->sk_lock.slock); 1582 /* 1583 * The sk_lock has mutex_lock() semantics here: 1584 */ 1585 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1586 local_bh_enable(); 1587} 1588 1589EXPORT_SYMBOL(lock_sock_nested); 1590 1591void fastcall release_sock(struct sock *sk) 1592{ 1593 /* 1594 * The sk_lock has mutex_unlock() semantics: 1595 */ 1596 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1597 1598 spin_lock_bh(&sk->sk_lock.slock); 1599 if (sk->sk_backlog.tail) 1600 __release_sock(sk); 1601 sk->sk_lock.owner = NULL; 1602 if (waitqueue_active(&sk->sk_lock.wq)) 1603 wake_up(&sk->sk_lock.wq); 1604 spin_unlock_bh(&sk->sk_lock.slock); 1605} 1606EXPORT_SYMBOL(release_sock); 1607 1608int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1609{ 1610 struct timeval tv; 1611 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1612 sock_enable_timestamp(sk); 1613 tv = ktime_to_timeval(sk->sk_stamp); 1614 if (tv.tv_sec == -1) 1615 return -ENOENT; 1616 if (tv.tv_sec == 0) { 1617 sk->sk_stamp = ktime_get_real(); 1618 tv = ktime_to_timeval(sk->sk_stamp); 1619 } 1620 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1621} 1622EXPORT_SYMBOL(sock_get_timestamp); 1623 1624int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1625{ 1626 struct timespec ts; 1627 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1628 sock_enable_timestamp(sk); 1629 ts = ktime_to_timespec(sk->sk_stamp); 1630 if (ts.tv_sec == -1) 1631 return -ENOENT; 1632 if (ts.tv_sec == 0) { 1633 sk->sk_stamp = ktime_get_real(); 1634 ts = ktime_to_timespec(sk->sk_stamp); 1635 } 1636 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1637} 1638EXPORT_SYMBOL(sock_get_timestampns); 1639 1640void sock_enable_timestamp(struct sock *sk) 1641{ 1642 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1643 sock_set_flag(sk, SOCK_TIMESTAMP); 1644 net_enable_timestamp(); 1645 } 1646} 1647EXPORT_SYMBOL(sock_enable_timestamp); 1648 1649/* 1650 * Get a socket option on an socket. 1651 * 1652 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1653 * asynchronous errors should be reported by getsockopt. We assume 1654 * this means if you specify SO_ERROR (otherwise whats the point of it). 1655 */ 1656int sock_common_getsockopt(struct socket *sock, int level, int optname, 1657 char __user *optval, int __user *optlen) 1658{ 1659 struct sock *sk = sock->sk; 1660 1661 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1662} 1663 1664EXPORT_SYMBOL(sock_common_getsockopt); 1665 1666#ifdef CONFIG_COMPAT 1667int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1668 char __user *optval, int __user *optlen) 1669{ 1670 struct sock *sk = sock->sk; 1671 1672 if (sk->sk_prot->compat_getsockopt != NULL) 1673 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1674 optval, optlen); 1675 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1676} 1677EXPORT_SYMBOL(compat_sock_common_getsockopt); 1678#endif 1679 1680int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1681 struct msghdr *msg, size_t size, int flags) 1682{ 1683 struct sock *sk = sock->sk; 1684 int addr_len = 0; 1685 int err; 1686 1687 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1688 flags & ~MSG_DONTWAIT, &addr_len); 1689 if (err >= 0) 1690 msg->msg_namelen = addr_len; 1691 return err; 1692} 1693 1694EXPORT_SYMBOL(sock_common_recvmsg); 1695 1696/* 1697 * Set socket options on an inet socket. 1698 */ 1699int sock_common_setsockopt(struct socket *sock, int level, int optname, 1700 char __user *optval, int optlen) 1701{ 1702 struct sock *sk = sock->sk; 1703 1704 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1705} 1706 1707EXPORT_SYMBOL(sock_common_setsockopt); 1708 1709#ifdef CONFIG_COMPAT 1710int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1711 char __user *optval, int optlen) 1712{ 1713 struct sock *sk = sock->sk; 1714 1715 if (sk->sk_prot->compat_setsockopt != NULL) 1716 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1717 optval, optlen); 1718 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1719} 1720EXPORT_SYMBOL(compat_sock_common_setsockopt); 1721#endif 1722 1723void sk_common_release(struct sock *sk) 1724{ 1725 if (sk->sk_prot->destroy) 1726 sk->sk_prot->destroy(sk); 1727 1728 /* 1729 * Observation: when sock_common_release is called, processes have 1730 * no access to socket. But net still has. 1731 * Step one, detach it from networking: 1732 * 1733 * A. Remove from hash tables. 1734 */ 1735 1736 sk->sk_prot->unhash(sk); 1737 1738 /* 1739 * In this point socket cannot receive new packets, but it is possible 1740 * that some packets are in flight because some CPU runs receiver and 1741 * did hash table lookup before we unhashed socket. They will achieve 1742 * receive queue and will be purged by socket destructor. 1743 * 1744 * Also we still have packets pending on receive queue and probably, 1745 * our own packets waiting in device queues. sock_destroy will drain 1746 * receive queue, but transmitted packets will delay socket destruction 1747 * until the last reference will be released. 1748 */ 1749 1750 sock_orphan(sk); 1751 1752 xfrm_sk_free_policy(sk); 1753 1754 sk_refcnt_debug_release(sk); 1755 sock_put(sk); 1756} 1757 1758EXPORT_SYMBOL(sk_common_release); 1759 1760static DEFINE_RWLOCK(proto_list_lock); 1761static LIST_HEAD(proto_list); 1762 1763int proto_register(struct proto *prot, int alloc_slab) 1764{ 1765 char *request_sock_slab_name = NULL; 1766 char *timewait_sock_slab_name; 1767 int rc = -ENOBUFS; 1768 1769 if (alloc_slab) { 1770 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1771 SLAB_HWCACHE_ALIGN, NULL); 1772 1773 if (prot->slab == NULL) { 1774 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1775 prot->name); 1776 goto out; 1777 } 1778 1779 if (prot->rsk_prot != NULL) { 1780 static const char mask[] = "request_sock_%s"; 1781 1782 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1783 if (request_sock_slab_name == NULL) 1784 goto out_free_sock_slab; 1785 1786 sprintf(request_sock_slab_name, mask, prot->name); 1787 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1788 prot->rsk_prot->obj_size, 0, 1789 SLAB_HWCACHE_ALIGN, NULL); 1790 1791 if (prot->rsk_prot->slab == NULL) { 1792 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1793 prot->name); 1794 goto out_free_request_sock_slab_name; 1795 } 1796 } 1797 1798 if (prot->twsk_prot != NULL) { 1799 static const char mask[] = "tw_sock_%s"; 1800 1801 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1802 1803 if (timewait_sock_slab_name == NULL) 1804 goto out_free_request_sock_slab; 1805 1806 sprintf(timewait_sock_slab_name, mask, prot->name); 1807 prot->twsk_prot->twsk_slab = 1808 kmem_cache_create(timewait_sock_slab_name, 1809 prot->twsk_prot->twsk_obj_size, 1810 0, SLAB_HWCACHE_ALIGN, 1811 NULL); 1812 if (prot->twsk_prot->twsk_slab == NULL) 1813 goto out_free_timewait_sock_slab_name; 1814 } 1815 } 1816 1817 write_lock(&proto_list_lock); 1818 list_add(&prot->node, &proto_list); 1819 write_unlock(&proto_list_lock); 1820 rc = 0; 1821out: 1822 return rc; 1823out_free_timewait_sock_slab_name: 1824 kfree(timewait_sock_slab_name); 1825out_free_request_sock_slab: 1826 if (prot->rsk_prot && prot->rsk_prot->slab) { 1827 kmem_cache_destroy(prot->rsk_prot->slab); 1828 prot->rsk_prot->slab = NULL; 1829 } 1830out_free_request_sock_slab_name: 1831 kfree(request_sock_slab_name); 1832out_free_sock_slab: 1833 kmem_cache_destroy(prot->slab); 1834 prot->slab = NULL; 1835 goto out; 1836} 1837 1838EXPORT_SYMBOL(proto_register); 1839 1840void proto_unregister(struct proto *prot) 1841{ 1842 write_lock(&proto_list_lock); 1843 list_del(&prot->node); 1844 write_unlock(&proto_list_lock); 1845 1846 if (prot->slab != NULL) { 1847 kmem_cache_destroy(prot->slab); 1848 prot->slab = NULL; 1849 } 1850 1851 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1852 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1853 1854 kmem_cache_destroy(prot->rsk_prot->slab); 1855 kfree(name); 1856 prot->rsk_prot->slab = NULL; 1857 } 1858 1859 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1860 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1861 1862 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1863 kfree(name); 1864 prot->twsk_prot->twsk_slab = NULL; 1865 } 1866} 1867 1868EXPORT_SYMBOL(proto_unregister); 1869 1870#ifdef CONFIG_PROC_FS 1871static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1872{ 1873 read_lock(&proto_list_lock); 1874 return seq_list_start_head(&proto_list, *pos); 1875} 1876 1877static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1878{ 1879 return seq_list_next(v, &proto_list, pos); 1880} 1881 1882static void proto_seq_stop(struct seq_file *seq, void *v) 1883{ 1884 read_unlock(&proto_list_lock); 1885} 1886 1887static char proto_method_implemented(const void *method) 1888{ 1889 return method == NULL ? 'n' : 'y'; 1890} 1891 1892static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1893{ 1894 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1895 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1896 proto->name, 1897 proto->obj_size, 1898 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1899 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1900 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1901 proto->max_header, 1902 proto->slab == NULL ? "no" : "yes", 1903 module_name(proto->owner), 1904 proto_method_implemented(proto->close), 1905 proto_method_implemented(proto->connect), 1906 proto_method_implemented(proto->disconnect), 1907 proto_method_implemented(proto->accept), 1908 proto_method_implemented(proto->ioctl), 1909 proto_method_implemented(proto->init), 1910 proto_method_implemented(proto->destroy), 1911 proto_method_implemented(proto->shutdown), 1912 proto_method_implemented(proto->setsockopt), 1913 proto_method_implemented(proto->getsockopt), 1914 proto_method_implemented(proto->sendmsg), 1915 proto_method_implemented(proto->recvmsg), 1916 proto_method_implemented(proto->sendpage), 1917 proto_method_implemented(proto->bind), 1918 proto_method_implemented(proto->backlog_rcv), 1919 proto_method_implemented(proto->hash), 1920 proto_method_implemented(proto->unhash), 1921 proto_method_implemented(proto->get_port), 1922 proto_method_implemented(proto->enter_memory_pressure)); 1923} 1924 1925static int proto_seq_show(struct seq_file *seq, void *v) 1926{ 1927 if (v == &proto_list) 1928 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1929 "protocol", 1930 "size", 1931 "sockets", 1932 "memory", 1933 "press", 1934 "maxhdr", 1935 "slab", 1936 "module", 1937 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1938 else 1939 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1940 return 0; 1941} 1942 1943static const struct seq_operations proto_seq_ops = { 1944 .start = proto_seq_start, 1945 .next = proto_seq_next, 1946 .stop = proto_seq_stop, 1947 .show = proto_seq_show, 1948}; 1949 1950static int proto_seq_open(struct inode *inode, struct file *file) 1951{ 1952 return seq_open(file, &proto_seq_ops); 1953} 1954 1955static const struct file_operations proto_seq_fops = { 1956 .owner = THIS_MODULE, 1957 .open = proto_seq_open, 1958 .read = seq_read, 1959 .llseek = seq_lseek, 1960 .release = seq_release, 1961}; 1962 1963static int __init proto_init(void) 1964{ 1965 /* register /proc/net/protocols */ 1966 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1967} 1968 1969subsys_initcall(proto_init); 1970 1971#endif /* PROC_FS */ 1972 1973EXPORT_SYMBOL(sk_alloc); 1974EXPORT_SYMBOL(sk_free); 1975EXPORT_SYMBOL(sk_send_sigurg); 1976EXPORT_SYMBOL(sock_alloc_send_skb); 1977EXPORT_SYMBOL(sock_init_data); 1978EXPORT_SYMBOL(sock_kfree_s); 1979EXPORT_SYMBOL(sock_kmalloc); 1980EXPORT_SYMBOL(sock_no_accept); 1981EXPORT_SYMBOL(sock_no_bind); 1982EXPORT_SYMBOL(sock_no_connect); 1983EXPORT_SYMBOL(sock_no_getname); 1984EXPORT_SYMBOL(sock_no_getsockopt); 1985EXPORT_SYMBOL(sock_no_ioctl); 1986EXPORT_SYMBOL(sock_no_listen); 1987EXPORT_SYMBOL(sock_no_mmap); 1988EXPORT_SYMBOL(sock_no_poll); 1989EXPORT_SYMBOL(sock_no_recvmsg); 1990EXPORT_SYMBOL(sock_no_sendmsg); 1991EXPORT_SYMBOL(sock_no_sendpage); 1992EXPORT_SYMBOL(sock_no_setsockopt); 1993EXPORT_SYMBOL(sock_no_shutdown); 1994EXPORT_SYMBOL(sock_no_socketpair); 1995EXPORT_SYMBOL(sock_rfree); 1996EXPORT_SYMBOL(sock_setsockopt); 1997EXPORT_SYMBOL(sock_wfree); 1998EXPORT_SYMBOL(sock_wmalloc); 1999EXPORT_SYMBOL(sock_i_uid); 2000EXPORT_SYMBOL(sock_i_ino); 2001EXPORT_SYMBOL(sysctl_optmem_max); 2002#ifdef CONFIG_SYSCTL 2003EXPORT_SYMBOL(sysctl_rmem_max); 2004EXPORT_SYMBOL(sysctl_wmem_max); 2005#endif 2006