sock.c revision 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
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_MAX" 186}; 187#endif 188 189/* 190 * sk_callback_lock locking rules are per-address-family, 191 * so split the lock classes by using a per-AF key: 192 */ 193static struct lock_class_key af_callback_keys[AF_MAX]; 194 195/* Take into consideration the size of the struct sk_buff overhead in the 196 * determination of these values, since that is non-constant across 197 * platforms. This makes socket queueing behavior and performance 198 * not depend upon such differences. 199 */ 200#define _SK_MEM_PACKETS 256 201#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 202#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 203#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 204 205/* Run time adjustable parameters. */ 206__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 207__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 208__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 209__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 210 211/* Maximal space eaten by iovec or ancilliary data plus some space */ 212int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 213 214static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 215{ 216 struct timeval tv; 217 218 if (optlen < sizeof(tv)) 219 return -EINVAL; 220 if (copy_from_user(&tv, optval, sizeof(tv))) 221 return -EFAULT; 222 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 223 return -EDOM; 224 225 if (tv.tv_sec < 0) { 226 static int warned __read_mostly; 227 228 *timeo_p = 0; 229 if (warned < 10 && net_ratelimit()) 230 warned++; 231 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 232 "tries to set negative timeout\n", 233 current->comm, current->pid); 234 return 0; 235 } 236 *timeo_p = MAX_SCHEDULE_TIMEOUT; 237 if (tv.tv_sec == 0 && tv.tv_usec == 0) 238 return 0; 239 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 240 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 241 return 0; 242} 243 244static void sock_warn_obsolete_bsdism(const char *name) 245{ 246 static int warned; 247 static char warncomm[TASK_COMM_LEN]; 248 if (strcmp(warncomm, current->comm) && warned < 5) { 249 strcpy(warncomm, current->comm); 250 printk(KERN_WARNING "process `%s' is using obsolete " 251 "%s SO_BSDCOMPAT\n", warncomm, name); 252 warned++; 253 } 254} 255 256static void sock_disable_timestamp(struct sock *sk) 257{ 258 if (sock_flag(sk, SOCK_TIMESTAMP)) { 259 sock_reset_flag(sk, SOCK_TIMESTAMP); 260 net_disable_timestamp(); 261 } 262} 263 264 265int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 266{ 267 int err = 0; 268 int skb_len; 269 270 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 271 number of warnings when compiling with -W --ANK 272 */ 273 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 274 (unsigned)sk->sk_rcvbuf) { 275 err = -ENOMEM; 276 goto out; 277 } 278 279 err = sk_filter(sk, skb); 280 if (err) 281 goto out; 282 283 skb->dev = NULL; 284 skb_set_owner_r(skb, sk); 285 286 /* Cache the SKB length before we tack it onto the receive 287 * queue. Once it is added it no longer belongs to us and 288 * may be freed by other threads of control pulling packets 289 * from the queue. 290 */ 291 skb_len = skb->len; 292 293 skb_queue_tail(&sk->sk_receive_queue, skb); 294 295 if (!sock_flag(sk, SOCK_DEAD)) 296 sk->sk_data_ready(sk, skb_len); 297out: 298 return err; 299} 300EXPORT_SYMBOL(sock_queue_rcv_skb); 301 302int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 303{ 304 int rc = NET_RX_SUCCESS; 305 306 if (sk_filter(sk, skb)) 307 goto discard_and_relse; 308 309 skb->dev = NULL; 310 311 if (nested) 312 bh_lock_sock_nested(sk); 313 else 314 bh_lock_sock(sk); 315 if (!sock_owned_by_user(sk)) { 316 /* 317 * trylock + unlock semantics: 318 */ 319 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 320 321 rc = sk->sk_backlog_rcv(sk, skb); 322 323 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 324 } else 325 sk_add_backlog(sk, skb); 326 bh_unlock_sock(sk); 327out: 328 sock_put(sk); 329 return rc; 330discard_and_relse: 331 kfree_skb(skb); 332 goto out; 333} 334EXPORT_SYMBOL(sk_receive_skb); 335 336struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 337{ 338 struct dst_entry *dst = sk->sk_dst_cache; 339 340 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 341 sk->sk_dst_cache = NULL; 342 dst_release(dst); 343 return NULL; 344 } 345 346 return dst; 347} 348EXPORT_SYMBOL(__sk_dst_check); 349 350struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 351{ 352 struct dst_entry *dst = sk_dst_get(sk); 353 354 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 355 sk_dst_reset(sk); 356 dst_release(dst); 357 return NULL; 358 } 359 360 return dst; 361} 362EXPORT_SYMBOL(sk_dst_check); 363 364/* 365 * This is meant for all protocols to use and covers goings on 366 * at the socket level. Everything here is generic. 367 */ 368 369int sock_setsockopt(struct socket *sock, int level, int optname, 370 char __user *optval, int optlen) 371{ 372 struct sock *sk=sock->sk; 373 struct sk_filter *filter; 374 int val; 375 int valbool; 376 struct linger ling; 377 int ret = 0; 378 379 /* 380 * Options without arguments 381 */ 382 383#ifdef SO_DONTLINGER /* Compatibility item... */ 384 if (optname == SO_DONTLINGER) { 385 lock_sock(sk); 386 sock_reset_flag(sk, SOCK_LINGER); 387 release_sock(sk); 388 return 0; 389 } 390#endif 391 392 if (optlen < sizeof(int)) 393 return -EINVAL; 394 395 if (get_user(val, (int __user *)optval)) 396 return -EFAULT; 397 398 valbool = val?1:0; 399 400 lock_sock(sk); 401 402 switch(optname) { 403 case SO_DEBUG: 404 if (val && !capable(CAP_NET_ADMIN)) { 405 ret = -EACCES; 406 } 407 else if (valbool) 408 sock_set_flag(sk, SOCK_DBG); 409 else 410 sock_reset_flag(sk, SOCK_DBG); 411 break; 412 case SO_REUSEADDR: 413 sk->sk_reuse = valbool; 414 break; 415 case SO_TYPE: 416 case SO_ERROR: 417 ret = -ENOPROTOOPT; 418 break; 419 case SO_DONTROUTE: 420 if (valbool) 421 sock_set_flag(sk, SOCK_LOCALROUTE); 422 else 423 sock_reset_flag(sk, SOCK_LOCALROUTE); 424 break; 425 case SO_BROADCAST: 426 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 427 break; 428 case SO_SNDBUF: 429 /* Don't error on this BSD doesn't and if you think 430 about it this is right. Otherwise apps have to 431 play 'guess the biggest size' games. RCVBUF/SNDBUF 432 are treated in BSD as hints */ 433 434 if (val > sysctl_wmem_max) 435 val = sysctl_wmem_max; 436set_sndbuf: 437 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 438 if ((val * 2) < SOCK_MIN_SNDBUF) 439 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 440 else 441 sk->sk_sndbuf = val * 2; 442 443 /* 444 * Wake up sending tasks if we 445 * upped the value. 446 */ 447 sk->sk_write_space(sk); 448 break; 449 450 case SO_SNDBUFFORCE: 451 if (!capable(CAP_NET_ADMIN)) { 452 ret = -EPERM; 453 break; 454 } 455 goto set_sndbuf; 456 457 case SO_RCVBUF: 458 /* Don't error on this BSD doesn't and if you think 459 about it this is right. Otherwise apps have to 460 play 'guess the biggest size' games. RCVBUF/SNDBUF 461 are treated in BSD as hints */ 462 463 if (val > sysctl_rmem_max) 464 val = sysctl_rmem_max; 465set_rcvbuf: 466 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 467 /* 468 * We double it on the way in to account for 469 * "struct sk_buff" etc. overhead. Applications 470 * assume that the SO_RCVBUF setting they make will 471 * allow that much actual data to be received on that 472 * socket. 473 * 474 * Applications are unaware that "struct sk_buff" and 475 * other overheads allocate from the receive buffer 476 * during socket buffer allocation. 477 * 478 * And after considering the possible alternatives, 479 * returning the value we actually used in getsockopt 480 * is the most desirable behavior. 481 */ 482 if ((val * 2) < SOCK_MIN_RCVBUF) 483 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 484 else 485 sk->sk_rcvbuf = val * 2; 486 break; 487 488 case SO_RCVBUFFORCE: 489 if (!capable(CAP_NET_ADMIN)) { 490 ret = -EPERM; 491 break; 492 } 493 goto set_rcvbuf; 494 495 case SO_KEEPALIVE: 496#ifdef CONFIG_INET 497 if (sk->sk_protocol == IPPROTO_TCP) 498 tcp_set_keepalive(sk, valbool); 499#endif 500 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 501 break; 502 503 case SO_OOBINLINE: 504 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 505 break; 506 507 case SO_NO_CHECK: 508 sk->sk_no_check = valbool; 509 break; 510 511 case SO_PRIORITY: 512 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 513 sk->sk_priority = val; 514 else 515 ret = -EPERM; 516 break; 517 518 case SO_LINGER: 519 if (optlen < sizeof(ling)) { 520 ret = -EINVAL; /* 1003.1g */ 521 break; 522 } 523 if (copy_from_user(&ling,optval,sizeof(ling))) { 524 ret = -EFAULT; 525 break; 526 } 527 if (!ling.l_onoff) 528 sock_reset_flag(sk, SOCK_LINGER); 529 else { 530#if (BITS_PER_LONG == 32) 531 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 532 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 533 else 534#endif 535 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 536 sock_set_flag(sk, SOCK_LINGER); 537 } 538 break; 539 540 case SO_BSDCOMPAT: 541 sock_warn_obsolete_bsdism("setsockopt"); 542 break; 543 544 case SO_PASSCRED: 545 if (valbool) 546 set_bit(SOCK_PASSCRED, &sock->flags); 547 else 548 clear_bit(SOCK_PASSCRED, &sock->flags); 549 break; 550 551 case SO_TIMESTAMP: 552 case SO_TIMESTAMPNS: 553 if (valbool) { 554 if (optname == SO_TIMESTAMP) 555 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 556 else 557 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 558 sock_set_flag(sk, SOCK_RCVTSTAMP); 559 sock_enable_timestamp(sk); 560 } else { 561 sock_reset_flag(sk, SOCK_RCVTSTAMP); 562 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 563 } 564 break; 565 566 case SO_RCVLOWAT: 567 if (val < 0) 568 val = INT_MAX; 569 sk->sk_rcvlowat = val ? : 1; 570 break; 571 572 case SO_RCVTIMEO: 573 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 574 break; 575 576 case SO_SNDTIMEO: 577 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 578 break; 579 580#ifdef CONFIG_NETDEVICES 581 case SO_BINDTODEVICE: 582 { 583 char devname[IFNAMSIZ]; 584 585 /* Sorry... */ 586 if (!capable(CAP_NET_RAW)) { 587 ret = -EPERM; 588 break; 589 } 590 591 /* Bind this socket to a particular device like "eth0", 592 * as specified in the passed interface name. If the 593 * name is "" or the option length is zero the socket 594 * is not bound. 595 */ 596 597 if (!valbool) { 598 sk->sk_bound_dev_if = 0; 599 } else { 600 if (optlen > IFNAMSIZ - 1) 601 optlen = IFNAMSIZ - 1; 602 memset(devname, 0, sizeof(devname)); 603 if (copy_from_user(devname, optval, optlen)) { 604 ret = -EFAULT; 605 break; 606 } 607 608 /* Remove any cached route for this socket. */ 609 sk_dst_reset(sk); 610 611 if (devname[0] == '\0') { 612 sk->sk_bound_dev_if = 0; 613 } else { 614 struct net_device *dev = dev_get_by_name(devname); 615 if (!dev) { 616 ret = -ENODEV; 617 break; 618 } 619 sk->sk_bound_dev_if = dev->ifindex; 620 dev_put(dev); 621 } 622 } 623 break; 624 } 625#endif 626 627 628 case SO_ATTACH_FILTER: 629 ret = -EINVAL; 630 if (optlen == sizeof(struct sock_fprog)) { 631 struct sock_fprog fprog; 632 633 ret = -EFAULT; 634 if (copy_from_user(&fprog, optval, sizeof(fprog))) 635 break; 636 637 ret = sk_attach_filter(&fprog, sk); 638 } 639 break; 640 641 case SO_DETACH_FILTER: 642 rcu_read_lock_bh(); 643 filter = rcu_dereference(sk->sk_filter); 644 if (filter) { 645 rcu_assign_pointer(sk->sk_filter, NULL); 646 sk_filter_release(sk, filter); 647 rcu_read_unlock_bh(); 648 break; 649 } 650 rcu_read_unlock_bh(); 651 ret = -ENONET; 652 break; 653 654 case SO_PASSSEC: 655 if (valbool) 656 set_bit(SOCK_PASSSEC, &sock->flags); 657 else 658 clear_bit(SOCK_PASSSEC, &sock->flags); 659 break; 660 661 /* We implement the SO_SNDLOWAT etc to 662 not be settable (1003.1g 5.3) */ 663 default: 664 ret = -ENOPROTOOPT; 665 break; 666 } 667 release_sock(sk); 668 return ret; 669} 670 671 672int sock_getsockopt(struct socket *sock, int level, int optname, 673 char __user *optval, int __user *optlen) 674{ 675 struct sock *sk = sock->sk; 676 677 union { 678 int val; 679 struct linger ling; 680 struct timeval tm; 681 } v; 682 683 unsigned int lv = sizeof(int); 684 int len; 685 686 if (get_user(len, optlen)) 687 return -EFAULT; 688 if (len < 0) 689 return -EINVAL; 690 691 switch(optname) { 692 case SO_DEBUG: 693 v.val = sock_flag(sk, SOCK_DBG); 694 break; 695 696 case SO_DONTROUTE: 697 v.val = sock_flag(sk, SOCK_LOCALROUTE); 698 break; 699 700 case SO_BROADCAST: 701 v.val = !!sock_flag(sk, SOCK_BROADCAST); 702 break; 703 704 case SO_SNDBUF: 705 v.val = sk->sk_sndbuf; 706 break; 707 708 case SO_RCVBUF: 709 v.val = sk->sk_rcvbuf; 710 break; 711 712 case SO_REUSEADDR: 713 v.val = sk->sk_reuse; 714 break; 715 716 case SO_KEEPALIVE: 717 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 718 break; 719 720 case SO_TYPE: 721 v.val = sk->sk_type; 722 break; 723 724 case SO_ERROR: 725 v.val = -sock_error(sk); 726 if (v.val==0) 727 v.val = xchg(&sk->sk_err_soft, 0); 728 break; 729 730 case SO_OOBINLINE: 731 v.val = !!sock_flag(sk, SOCK_URGINLINE); 732 break; 733 734 case SO_NO_CHECK: 735 v.val = sk->sk_no_check; 736 break; 737 738 case SO_PRIORITY: 739 v.val = sk->sk_priority; 740 break; 741 742 case SO_LINGER: 743 lv = sizeof(v.ling); 744 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 745 v.ling.l_linger = sk->sk_lingertime / HZ; 746 break; 747 748 case SO_BSDCOMPAT: 749 sock_warn_obsolete_bsdism("getsockopt"); 750 break; 751 752 case SO_TIMESTAMP: 753 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 754 !sock_flag(sk, SOCK_RCVTSTAMPNS); 755 break; 756 757 case SO_TIMESTAMPNS: 758 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 759 break; 760 761 case SO_RCVTIMEO: 762 lv=sizeof(struct timeval); 763 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 764 v.tm.tv_sec = 0; 765 v.tm.tv_usec = 0; 766 } else { 767 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 768 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 769 } 770 break; 771 772 case SO_SNDTIMEO: 773 lv=sizeof(struct timeval); 774 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 775 v.tm.tv_sec = 0; 776 v.tm.tv_usec = 0; 777 } else { 778 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 779 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 780 } 781 break; 782 783 case SO_RCVLOWAT: 784 v.val = sk->sk_rcvlowat; 785 break; 786 787 case SO_SNDLOWAT: 788 v.val=1; 789 break; 790 791 case SO_PASSCRED: 792 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 793 break; 794 795 case SO_PEERCRED: 796 if (len > sizeof(sk->sk_peercred)) 797 len = sizeof(sk->sk_peercred); 798 if (copy_to_user(optval, &sk->sk_peercred, len)) 799 return -EFAULT; 800 goto lenout; 801 802 case SO_PEERNAME: 803 { 804 char address[128]; 805 806 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 807 return -ENOTCONN; 808 if (lv < len) 809 return -EINVAL; 810 if (copy_to_user(optval, address, len)) 811 return -EFAULT; 812 goto lenout; 813 } 814 815 /* Dubious BSD thing... Probably nobody even uses it, but 816 * the UNIX standard wants it for whatever reason... -DaveM 817 */ 818 case SO_ACCEPTCONN: 819 v.val = sk->sk_state == TCP_LISTEN; 820 break; 821 822 case SO_PASSSEC: 823 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 824 break; 825 826 case SO_PEERSEC: 827 return security_socket_getpeersec_stream(sock, optval, optlen, len); 828 829 default: 830 return -ENOPROTOOPT; 831 } 832 833 if (len > lv) 834 len = lv; 835 if (copy_to_user(optval, &v, len)) 836 return -EFAULT; 837lenout: 838 if (put_user(len, optlen)) 839 return -EFAULT; 840 return 0; 841} 842 843/* 844 * Initialize an sk_lock. 845 * 846 * (We also register the sk_lock with the lock validator.) 847 */ 848static inline void sock_lock_init(struct sock *sk) 849{ 850 sock_lock_init_class_and_name(sk, 851 af_family_slock_key_strings[sk->sk_family], 852 af_family_slock_keys + sk->sk_family, 853 af_family_key_strings[sk->sk_family], 854 af_family_keys + sk->sk_family); 855} 856 857/** 858 * sk_alloc - All socket objects are allocated here 859 * @family: protocol family 860 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 861 * @prot: struct proto associated with this new sock instance 862 * @zero_it: if we should zero the newly allocated sock 863 */ 864struct sock *sk_alloc(int family, gfp_t priority, 865 struct proto *prot, int zero_it) 866{ 867 struct sock *sk = NULL; 868 struct kmem_cache *slab = prot->slab; 869 870 if (slab != NULL) 871 sk = kmem_cache_alloc(slab, priority); 872 else 873 sk = kmalloc(prot->obj_size, priority); 874 875 if (sk) { 876 if (zero_it) { 877 memset(sk, 0, prot->obj_size); 878 sk->sk_family = family; 879 /* 880 * See comment in struct sock definition to understand 881 * why we need sk_prot_creator -acme 882 */ 883 sk->sk_prot = sk->sk_prot_creator = prot; 884 sock_lock_init(sk); 885 } 886 887 if (security_sk_alloc(sk, family, priority)) 888 goto out_free; 889 890 if (!try_module_get(prot->owner)) 891 goto out_free; 892 } 893 return sk; 894 895out_free: 896 if (slab != NULL) 897 kmem_cache_free(slab, sk); 898 else 899 kfree(sk); 900 return NULL; 901} 902 903void sk_free(struct sock *sk) 904{ 905 struct sk_filter *filter; 906 struct module *owner = sk->sk_prot_creator->owner; 907 908 if (sk->sk_destruct) 909 sk->sk_destruct(sk); 910 911 filter = rcu_dereference(sk->sk_filter); 912 if (filter) { 913 sk_filter_release(sk, filter); 914 rcu_assign_pointer(sk->sk_filter, NULL); 915 } 916 917 sock_disable_timestamp(sk); 918 919 if (atomic_read(&sk->sk_omem_alloc)) 920 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 921 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 922 923 security_sk_free(sk); 924 if (sk->sk_prot_creator->slab != NULL) 925 kmem_cache_free(sk->sk_prot_creator->slab, sk); 926 else 927 kfree(sk); 928 module_put(owner); 929} 930 931struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 932{ 933 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); 934 935 if (newsk != NULL) { 936 struct sk_filter *filter; 937 938 sock_copy(newsk, sk); 939 940 /* SANITY */ 941 sk_node_init(&newsk->sk_node); 942 sock_lock_init(newsk); 943 bh_lock_sock(newsk); 944 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 945 946 atomic_set(&newsk->sk_rmem_alloc, 0); 947 atomic_set(&newsk->sk_wmem_alloc, 0); 948 atomic_set(&newsk->sk_omem_alloc, 0); 949 skb_queue_head_init(&newsk->sk_receive_queue); 950 skb_queue_head_init(&newsk->sk_write_queue); 951#ifdef CONFIG_NET_DMA 952 skb_queue_head_init(&newsk->sk_async_wait_queue); 953#endif 954 955 rwlock_init(&newsk->sk_dst_lock); 956 rwlock_init(&newsk->sk_callback_lock); 957 lockdep_set_class_and_name(&newsk->sk_callback_lock, 958 af_callback_keys + newsk->sk_family, 959 af_family_clock_key_strings[newsk->sk_family]); 960 961 newsk->sk_dst_cache = NULL; 962 newsk->sk_wmem_queued = 0; 963 newsk->sk_forward_alloc = 0; 964 newsk->sk_send_head = NULL; 965 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 966 967 sock_reset_flag(newsk, SOCK_DONE); 968 skb_queue_head_init(&newsk->sk_error_queue); 969 970 filter = newsk->sk_filter; 971 if (filter != NULL) 972 sk_filter_charge(newsk, filter); 973 974 if (unlikely(xfrm_sk_clone_policy(newsk))) { 975 /* It is still raw copy of parent, so invalidate 976 * destructor and make plain sk_free() */ 977 newsk->sk_destruct = NULL; 978 sk_free(newsk); 979 newsk = NULL; 980 goto out; 981 } 982 983 newsk->sk_err = 0; 984 newsk->sk_priority = 0; 985 atomic_set(&newsk->sk_refcnt, 2); 986 987 /* 988 * Increment the counter in the same struct proto as the master 989 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 990 * is the same as sk->sk_prot->socks, as this field was copied 991 * with memcpy). 992 * 993 * This _changes_ the previous behaviour, where 994 * tcp_create_openreq_child always was incrementing the 995 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 996 * to be taken into account in all callers. -acme 997 */ 998 sk_refcnt_debug_inc(newsk); 999 newsk->sk_socket = NULL; 1000 newsk->sk_sleep = NULL; 1001 1002 if (newsk->sk_prot->sockets_allocated) 1003 atomic_inc(newsk->sk_prot->sockets_allocated); 1004 } 1005out: 1006 return newsk; 1007} 1008 1009EXPORT_SYMBOL_GPL(sk_clone); 1010 1011void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1012{ 1013 __sk_dst_set(sk, dst); 1014 sk->sk_route_caps = dst->dev->features; 1015 if (sk->sk_route_caps & NETIF_F_GSO) 1016 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1017 if (sk_can_gso(sk)) { 1018 if (dst->header_len) 1019 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1020 else 1021 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1022 } 1023} 1024EXPORT_SYMBOL_GPL(sk_setup_caps); 1025 1026void __init sk_init(void) 1027{ 1028 if (num_physpages <= 4096) { 1029 sysctl_wmem_max = 32767; 1030 sysctl_rmem_max = 32767; 1031 sysctl_wmem_default = 32767; 1032 sysctl_rmem_default = 32767; 1033 } else if (num_physpages >= 131072) { 1034 sysctl_wmem_max = 131071; 1035 sysctl_rmem_max = 131071; 1036 } 1037} 1038 1039/* 1040 * Simple resource managers for sockets. 1041 */ 1042 1043 1044/* 1045 * Write buffer destructor automatically called from kfree_skb. 1046 */ 1047void sock_wfree(struct sk_buff *skb) 1048{ 1049 struct sock *sk = skb->sk; 1050 1051 /* In case it might be waiting for more memory. */ 1052 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1053 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1054 sk->sk_write_space(sk); 1055 sock_put(sk); 1056} 1057 1058/* 1059 * Read buffer destructor automatically called from kfree_skb. 1060 */ 1061void sock_rfree(struct sk_buff *skb) 1062{ 1063 struct sock *sk = skb->sk; 1064 1065 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1066} 1067 1068 1069int sock_i_uid(struct sock *sk) 1070{ 1071 int uid; 1072 1073 read_lock(&sk->sk_callback_lock); 1074 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1075 read_unlock(&sk->sk_callback_lock); 1076 return uid; 1077} 1078 1079unsigned long sock_i_ino(struct sock *sk) 1080{ 1081 unsigned long ino; 1082 1083 read_lock(&sk->sk_callback_lock); 1084 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1085 read_unlock(&sk->sk_callback_lock); 1086 return ino; 1087} 1088 1089/* 1090 * Allocate a skb from the socket's send buffer. 1091 */ 1092struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1093 gfp_t priority) 1094{ 1095 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1096 struct sk_buff * skb = alloc_skb(size, priority); 1097 if (skb) { 1098 skb_set_owner_w(skb, sk); 1099 return skb; 1100 } 1101 } 1102 return NULL; 1103} 1104 1105/* 1106 * Allocate a skb from the socket's receive buffer. 1107 */ 1108struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1109 gfp_t priority) 1110{ 1111 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1112 struct sk_buff *skb = alloc_skb(size, priority); 1113 if (skb) { 1114 skb_set_owner_r(skb, sk); 1115 return skb; 1116 } 1117 } 1118 return NULL; 1119} 1120 1121/* 1122 * Allocate a memory block from the socket's option memory buffer. 1123 */ 1124void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1125{ 1126 if ((unsigned)size <= sysctl_optmem_max && 1127 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1128 void *mem; 1129 /* First do the add, to avoid the race if kmalloc 1130 * might sleep. 1131 */ 1132 atomic_add(size, &sk->sk_omem_alloc); 1133 mem = kmalloc(size, priority); 1134 if (mem) 1135 return mem; 1136 atomic_sub(size, &sk->sk_omem_alloc); 1137 } 1138 return NULL; 1139} 1140 1141/* 1142 * Free an option memory block. 1143 */ 1144void sock_kfree_s(struct sock *sk, void *mem, int size) 1145{ 1146 kfree(mem); 1147 atomic_sub(size, &sk->sk_omem_alloc); 1148} 1149 1150/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1151 I think, these locks should be removed for datagram sockets. 1152 */ 1153static long sock_wait_for_wmem(struct sock * sk, long timeo) 1154{ 1155 DEFINE_WAIT(wait); 1156 1157 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1158 for (;;) { 1159 if (!timeo) 1160 break; 1161 if (signal_pending(current)) 1162 break; 1163 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1164 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1165 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1166 break; 1167 if (sk->sk_shutdown & SEND_SHUTDOWN) 1168 break; 1169 if (sk->sk_err) 1170 break; 1171 timeo = schedule_timeout(timeo); 1172 } 1173 finish_wait(sk->sk_sleep, &wait); 1174 return timeo; 1175} 1176 1177 1178/* 1179 * Generic send/receive buffer handlers 1180 */ 1181 1182static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1183 unsigned long header_len, 1184 unsigned long data_len, 1185 int noblock, int *errcode) 1186{ 1187 struct sk_buff *skb; 1188 gfp_t gfp_mask; 1189 long timeo; 1190 int err; 1191 1192 gfp_mask = sk->sk_allocation; 1193 if (gfp_mask & __GFP_WAIT) 1194 gfp_mask |= __GFP_REPEAT; 1195 1196 timeo = sock_sndtimeo(sk, noblock); 1197 while (1) { 1198 err = sock_error(sk); 1199 if (err != 0) 1200 goto failure; 1201 1202 err = -EPIPE; 1203 if (sk->sk_shutdown & SEND_SHUTDOWN) 1204 goto failure; 1205 1206 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1207 skb = alloc_skb(header_len, gfp_mask); 1208 if (skb) { 1209 int npages; 1210 int i; 1211 1212 /* No pages, we're done... */ 1213 if (!data_len) 1214 break; 1215 1216 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1217 skb->truesize += data_len; 1218 skb_shinfo(skb)->nr_frags = npages; 1219 for (i = 0; i < npages; i++) { 1220 struct page *page; 1221 skb_frag_t *frag; 1222 1223 page = alloc_pages(sk->sk_allocation, 0); 1224 if (!page) { 1225 err = -ENOBUFS; 1226 skb_shinfo(skb)->nr_frags = i; 1227 kfree_skb(skb); 1228 goto failure; 1229 } 1230 1231 frag = &skb_shinfo(skb)->frags[i]; 1232 frag->page = page; 1233 frag->page_offset = 0; 1234 frag->size = (data_len >= PAGE_SIZE ? 1235 PAGE_SIZE : 1236 data_len); 1237 data_len -= PAGE_SIZE; 1238 } 1239 1240 /* Full success... */ 1241 break; 1242 } 1243 err = -ENOBUFS; 1244 goto failure; 1245 } 1246 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1247 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1248 err = -EAGAIN; 1249 if (!timeo) 1250 goto failure; 1251 if (signal_pending(current)) 1252 goto interrupted; 1253 timeo = sock_wait_for_wmem(sk, timeo); 1254 } 1255 1256 skb_set_owner_w(skb, sk); 1257 return skb; 1258 1259interrupted: 1260 err = sock_intr_errno(timeo); 1261failure: 1262 *errcode = err; 1263 return NULL; 1264} 1265 1266struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1267 int noblock, int *errcode) 1268{ 1269 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1270} 1271 1272static void __lock_sock(struct sock *sk) 1273{ 1274 DEFINE_WAIT(wait); 1275 1276 for (;;) { 1277 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1278 TASK_UNINTERRUPTIBLE); 1279 spin_unlock_bh(&sk->sk_lock.slock); 1280 schedule(); 1281 spin_lock_bh(&sk->sk_lock.slock); 1282 if (!sock_owned_by_user(sk)) 1283 break; 1284 } 1285 finish_wait(&sk->sk_lock.wq, &wait); 1286} 1287 1288static void __release_sock(struct sock *sk) 1289{ 1290 struct sk_buff *skb = sk->sk_backlog.head; 1291 1292 do { 1293 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1294 bh_unlock_sock(sk); 1295 1296 do { 1297 struct sk_buff *next = skb->next; 1298 1299 skb->next = NULL; 1300 sk->sk_backlog_rcv(sk, skb); 1301 1302 /* 1303 * We are in process context here with softirqs 1304 * disabled, use cond_resched_softirq() to preempt. 1305 * This is safe to do because we've taken the backlog 1306 * queue private: 1307 */ 1308 cond_resched_softirq(); 1309 1310 skb = next; 1311 } while (skb != NULL); 1312 1313 bh_lock_sock(sk); 1314 } while ((skb = sk->sk_backlog.head) != NULL); 1315} 1316 1317/** 1318 * sk_wait_data - wait for data to arrive at sk_receive_queue 1319 * @sk: sock to wait on 1320 * @timeo: for how long 1321 * 1322 * Now socket state including sk->sk_err is changed only under lock, 1323 * hence we may omit checks after joining wait queue. 1324 * We check receive queue before schedule() only as optimization; 1325 * it is very likely that release_sock() added new data. 1326 */ 1327int sk_wait_data(struct sock *sk, long *timeo) 1328{ 1329 int rc; 1330 DEFINE_WAIT(wait); 1331 1332 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1333 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1334 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1335 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1336 finish_wait(sk->sk_sleep, &wait); 1337 return rc; 1338} 1339 1340EXPORT_SYMBOL(sk_wait_data); 1341 1342/* 1343 * Set of default routines for initialising struct proto_ops when 1344 * the protocol does not support a particular function. In certain 1345 * cases where it makes no sense for a protocol to have a "do nothing" 1346 * function, some default processing is provided. 1347 */ 1348 1349int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1350{ 1351 return -EOPNOTSUPP; 1352} 1353 1354int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1355 int len, int flags) 1356{ 1357 return -EOPNOTSUPP; 1358} 1359 1360int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1361{ 1362 return -EOPNOTSUPP; 1363} 1364 1365int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1366{ 1367 return -EOPNOTSUPP; 1368} 1369 1370int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1371 int *len, int peer) 1372{ 1373 return -EOPNOTSUPP; 1374} 1375 1376unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1377{ 1378 return 0; 1379} 1380 1381int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1382{ 1383 return -EOPNOTSUPP; 1384} 1385 1386int sock_no_listen(struct socket *sock, int backlog) 1387{ 1388 return -EOPNOTSUPP; 1389} 1390 1391int sock_no_shutdown(struct socket *sock, int how) 1392{ 1393 return -EOPNOTSUPP; 1394} 1395 1396int sock_no_setsockopt(struct socket *sock, int level, int optname, 1397 char __user *optval, int optlen) 1398{ 1399 return -EOPNOTSUPP; 1400} 1401 1402int sock_no_getsockopt(struct socket *sock, int level, int optname, 1403 char __user *optval, int __user *optlen) 1404{ 1405 return -EOPNOTSUPP; 1406} 1407 1408int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1409 size_t len) 1410{ 1411 return -EOPNOTSUPP; 1412} 1413 1414int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1415 size_t len, int flags) 1416{ 1417 return -EOPNOTSUPP; 1418} 1419 1420int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1421{ 1422 /* Mirror missing mmap method error code */ 1423 return -ENODEV; 1424} 1425 1426ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1427{ 1428 ssize_t res; 1429 struct msghdr msg = {.msg_flags = flags}; 1430 struct kvec iov; 1431 char *kaddr = kmap(page); 1432 iov.iov_base = kaddr + offset; 1433 iov.iov_len = size; 1434 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1435 kunmap(page); 1436 return res; 1437} 1438 1439/* 1440 * Default Socket Callbacks 1441 */ 1442 1443static void sock_def_wakeup(struct sock *sk) 1444{ 1445 read_lock(&sk->sk_callback_lock); 1446 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1447 wake_up_interruptible_all(sk->sk_sleep); 1448 read_unlock(&sk->sk_callback_lock); 1449} 1450 1451static void sock_def_error_report(struct sock *sk) 1452{ 1453 read_lock(&sk->sk_callback_lock); 1454 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1455 wake_up_interruptible(sk->sk_sleep); 1456 sk_wake_async(sk,0,POLL_ERR); 1457 read_unlock(&sk->sk_callback_lock); 1458} 1459 1460static void sock_def_readable(struct sock *sk, int len) 1461{ 1462 read_lock(&sk->sk_callback_lock); 1463 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1464 wake_up_interruptible(sk->sk_sleep); 1465 sk_wake_async(sk,1,POLL_IN); 1466 read_unlock(&sk->sk_callback_lock); 1467} 1468 1469static void sock_def_write_space(struct sock *sk) 1470{ 1471 read_lock(&sk->sk_callback_lock); 1472 1473 /* Do not wake up a writer until he can make "significant" 1474 * progress. --DaveM 1475 */ 1476 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1477 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1478 wake_up_interruptible(sk->sk_sleep); 1479 1480 /* Should agree with poll, otherwise some programs break */ 1481 if (sock_writeable(sk)) 1482 sk_wake_async(sk, 2, POLL_OUT); 1483 } 1484 1485 read_unlock(&sk->sk_callback_lock); 1486} 1487 1488static void sock_def_destruct(struct sock *sk) 1489{ 1490 kfree(sk->sk_protinfo); 1491} 1492 1493void sk_send_sigurg(struct sock *sk) 1494{ 1495 if (sk->sk_socket && sk->sk_socket->file) 1496 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1497 sk_wake_async(sk, 3, POLL_PRI); 1498} 1499 1500void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1501 unsigned long expires) 1502{ 1503 if (!mod_timer(timer, expires)) 1504 sock_hold(sk); 1505} 1506 1507EXPORT_SYMBOL(sk_reset_timer); 1508 1509void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1510{ 1511 if (timer_pending(timer) && del_timer(timer)) 1512 __sock_put(sk); 1513} 1514 1515EXPORT_SYMBOL(sk_stop_timer); 1516 1517void sock_init_data(struct socket *sock, struct sock *sk) 1518{ 1519 skb_queue_head_init(&sk->sk_receive_queue); 1520 skb_queue_head_init(&sk->sk_write_queue); 1521 skb_queue_head_init(&sk->sk_error_queue); 1522#ifdef CONFIG_NET_DMA 1523 skb_queue_head_init(&sk->sk_async_wait_queue); 1524#endif 1525 1526 sk->sk_send_head = NULL; 1527 1528 init_timer(&sk->sk_timer); 1529 1530 sk->sk_allocation = GFP_KERNEL; 1531 sk->sk_rcvbuf = sysctl_rmem_default; 1532 sk->sk_sndbuf = sysctl_wmem_default; 1533 sk->sk_state = TCP_CLOSE; 1534 sk->sk_socket = sock; 1535 1536 sock_set_flag(sk, SOCK_ZAPPED); 1537 1538 if (sock) { 1539 sk->sk_type = sock->type; 1540 sk->sk_sleep = &sock->wait; 1541 sock->sk = sk; 1542 } else 1543 sk->sk_sleep = NULL; 1544 1545 rwlock_init(&sk->sk_dst_lock); 1546 rwlock_init(&sk->sk_callback_lock); 1547 lockdep_set_class_and_name(&sk->sk_callback_lock, 1548 af_callback_keys + sk->sk_family, 1549 af_family_clock_key_strings[sk->sk_family]); 1550 1551 sk->sk_state_change = sock_def_wakeup; 1552 sk->sk_data_ready = sock_def_readable; 1553 sk->sk_write_space = sock_def_write_space; 1554 sk->sk_error_report = sock_def_error_report; 1555 sk->sk_destruct = sock_def_destruct; 1556 1557 sk->sk_sndmsg_page = NULL; 1558 sk->sk_sndmsg_off = 0; 1559 1560 sk->sk_peercred.pid = 0; 1561 sk->sk_peercred.uid = -1; 1562 sk->sk_peercred.gid = -1; 1563 sk->sk_write_pending = 0; 1564 sk->sk_rcvlowat = 1; 1565 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1566 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1567 1568 sk->sk_stamp = ktime_set(-1L, -1L); 1569 1570 atomic_set(&sk->sk_refcnt, 1); 1571} 1572 1573void fastcall lock_sock_nested(struct sock *sk, int subclass) 1574{ 1575 might_sleep(); 1576 spin_lock_bh(&sk->sk_lock.slock); 1577 if (sk->sk_lock.owner) 1578 __lock_sock(sk); 1579 sk->sk_lock.owner = (void *)1; 1580 spin_unlock(&sk->sk_lock.slock); 1581 /* 1582 * The sk_lock has mutex_lock() semantics here: 1583 */ 1584 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1585 local_bh_enable(); 1586} 1587 1588EXPORT_SYMBOL(lock_sock_nested); 1589 1590void fastcall release_sock(struct sock *sk) 1591{ 1592 /* 1593 * The sk_lock has mutex_unlock() semantics: 1594 */ 1595 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1596 1597 spin_lock_bh(&sk->sk_lock.slock); 1598 if (sk->sk_backlog.tail) 1599 __release_sock(sk); 1600 sk->sk_lock.owner = NULL; 1601 if (waitqueue_active(&sk->sk_lock.wq)) 1602 wake_up(&sk->sk_lock.wq); 1603 spin_unlock_bh(&sk->sk_lock.slock); 1604} 1605EXPORT_SYMBOL(release_sock); 1606 1607int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1608{ 1609 struct timeval tv; 1610 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1611 sock_enable_timestamp(sk); 1612 tv = ktime_to_timeval(sk->sk_stamp); 1613 if (tv.tv_sec == -1) 1614 return -ENOENT; 1615 if (tv.tv_sec == 0) { 1616 sk->sk_stamp = ktime_get_real(); 1617 tv = ktime_to_timeval(sk->sk_stamp); 1618 } 1619 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1620} 1621EXPORT_SYMBOL(sock_get_timestamp); 1622 1623int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1624{ 1625 struct timespec ts; 1626 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1627 sock_enable_timestamp(sk); 1628 ts = ktime_to_timespec(sk->sk_stamp); 1629 if (ts.tv_sec == -1) 1630 return -ENOENT; 1631 if (ts.tv_sec == 0) { 1632 sk->sk_stamp = ktime_get_real(); 1633 ts = ktime_to_timespec(sk->sk_stamp); 1634 } 1635 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1636} 1637EXPORT_SYMBOL(sock_get_timestampns); 1638 1639void sock_enable_timestamp(struct sock *sk) 1640{ 1641 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1642 sock_set_flag(sk, SOCK_TIMESTAMP); 1643 net_enable_timestamp(); 1644 } 1645} 1646EXPORT_SYMBOL(sock_enable_timestamp); 1647 1648/* 1649 * Get a socket option on an socket. 1650 * 1651 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1652 * asynchronous errors should be reported by getsockopt. We assume 1653 * this means if you specify SO_ERROR (otherwise whats the point of it). 1654 */ 1655int sock_common_getsockopt(struct socket *sock, int level, int optname, 1656 char __user *optval, int __user *optlen) 1657{ 1658 struct sock *sk = sock->sk; 1659 1660 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1661} 1662 1663EXPORT_SYMBOL(sock_common_getsockopt); 1664 1665#ifdef CONFIG_COMPAT 1666int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1667 char __user *optval, int __user *optlen) 1668{ 1669 struct sock *sk = sock->sk; 1670 1671 if (sk->sk_prot->compat_getsockopt != NULL) 1672 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1673 optval, optlen); 1674 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1675} 1676EXPORT_SYMBOL(compat_sock_common_getsockopt); 1677#endif 1678 1679int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1680 struct msghdr *msg, size_t size, int flags) 1681{ 1682 struct sock *sk = sock->sk; 1683 int addr_len = 0; 1684 int err; 1685 1686 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1687 flags & ~MSG_DONTWAIT, &addr_len); 1688 if (err >= 0) 1689 msg->msg_namelen = addr_len; 1690 return err; 1691} 1692 1693EXPORT_SYMBOL(sock_common_recvmsg); 1694 1695/* 1696 * Set socket options on an inet socket. 1697 */ 1698int sock_common_setsockopt(struct socket *sock, int level, int optname, 1699 char __user *optval, int optlen) 1700{ 1701 struct sock *sk = sock->sk; 1702 1703 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1704} 1705 1706EXPORT_SYMBOL(sock_common_setsockopt); 1707 1708#ifdef CONFIG_COMPAT 1709int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1710 char __user *optval, int optlen) 1711{ 1712 struct sock *sk = sock->sk; 1713 1714 if (sk->sk_prot->compat_setsockopt != NULL) 1715 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1716 optval, optlen); 1717 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1718} 1719EXPORT_SYMBOL(compat_sock_common_setsockopt); 1720#endif 1721 1722void sk_common_release(struct sock *sk) 1723{ 1724 if (sk->sk_prot->destroy) 1725 sk->sk_prot->destroy(sk); 1726 1727 /* 1728 * Observation: when sock_common_release is called, processes have 1729 * no access to socket. But net still has. 1730 * Step one, detach it from networking: 1731 * 1732 * A. Remove from hash tables. 1733 */ 1734 1735 sk->sk_prot->unhash(sk); 1736 1737 /* 1738 * In this point socket cannot receive new packets, but it is possible 1739 * that some packets are in flight because some CPU runs receiver and 1740 * did hash table lookup before we unhashed socket. They will achieve 1741 * receive queue and will be purged by socket destructor. 1742 * 1743 * Also we still have packets pending on receive queue and probably, 1744 * our own packets waiting in device queues. sock_destroy will drain 1745 * receive queue, but transmitted packets will delay socket destruction 1746 * until the last reference will be released. 1747 */ 1748 1749 sock_orphan(sk); 1750 1751 xfrm_sk_free_policy(sk); 1752 1753 sk_refcnt_debug_release(sk); 1754 sock_put(sk); 1755} 1756 1757EXPORT_SYMBOL(sk_common_release); 1758 1759static DEFINE_RWLOCK(proto_list_lock); 1760static LIST_HEAD(proto_list); 1761 1762int proto_register(struct proto *prot, int alloc_slab) 1763{ 1764 char *request_sock_slab_name = NULL; 1765 char *timewait_sock_slab_name; 1766 int rc = -ENOBUFS; 1767 1768 if (alloc_slab) { 1769 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1770 SLAB_HWCACHE_ALIGN, NULL); 1771 1772 if (prot->slab == NULL) { 1773 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1774 prot->name); 1775 goto out; 1776 } 1777 1778 if (prot->rsk_prot != NULL) { 1779 static const char mask[] = "request_sock_%s"; 1780 1781 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1782 if (request_sock_slab_name == NULL) 1783 goto out_free_sock_slab; 1784 1785 sprintf(request_sock_slab_name, mask, prot->name); 1786 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1787 prot->rsk_prot->obj_size, 0, 1788 SLAB_HWCACHE_ALIGN, NULL); 1789 1790 if (prot->rsk_prot->slab == NULL) { 1791 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1792 prot->name); 1793 goto out_free_request_sock_slab_name; 1794 } 1795 } 1796 1797 if (prot->twsk_prot != NULL) { 1798 static const char mask[] = "tw_sock_%s"; 1799 1800 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1801 1802 if (timewait_sock_slab_name == NULL) 1803 goto out_free_request_sock_slab; 1804 1805 sprintf(timewait_sock_slab_name, mask, prot->name); 1806 prot->twsk_prot->twsk_slab = 1807 kmem_cache_create(timewait_sock_slab_name, 1808 prot->twsk_prot->twsk_obj_size, 1809 0, SLAB_HWCACHE_ALIGN, 1810 NULL); 1811 if (prot->twsk_prot->twsk_slab == NULL) 1812 goto out_free_timewait_sock_slab_name; 1813 } 1814 } 1815 1816 write_lock(&proto_list_lock); 1817 list_add(&prot->node, &proto_list); 1818 write_unlock(&proto_list_lock); 1819 rc = 0; 1820out: 1821 return rc; 1822out_free_timewait_sock_slab_name: 1823 kfree(timewait_sock_slab_name); 1824out_free_request_sock_slab: 1825 if (prot->rsk_prot && prot->rsk_prot->slab) { 1826 kmem_cache_destroy(prot->rsk_prot->slab); 1827 prot->rsk_prot->slab = NULL; 1828 } 1829out_free_request_sock_slab_name: 1830 kfree(request_sock_slab_name); 1831out_free_sock_slab: 1832 kmem_cache_destroy(prot->slab); 1833 prot->slab = NULL; 1834 goto out; 1835} 1836 1837EXPORT_SYMBOL(proto_register); 1838 1839void proto_unregister(struct proto *prot) 1840{ 1841 write_lock(&proto_list_lock); 1842 list_del(&prot->node); 1843 write_unlock(&proto_list_lock); 1844 1845 if (prot->slab != NULL) { 1846 kmem_cache_destroy(prot->slab); 1847 prot->slab = NULL; 1848 } 1849 1850 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1851 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1852 1853 kmem_cache_destroy(prot->rsk_prot->slab); 1854 kfree(name); 1855 prot->rsk_prot->slab = NULL; 1856 } 1857 1858 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1859 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1860 1861 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1862 kfree(name); 1863 prot->twsk_prot->twsk_slab = NULL; 1864 } 1865} 1866 1867EXPORT_SYMBOL(proto_unregister); 1868 1869#ifdef CONFIG_PROC_FS 1870static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1871{ 1872 read_lock(&proto_list_lock); 1873 return seq_list_start_head(&proto_list, *pos); 1874} 1875 1876static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1877{ 1878 return seq_list_next(v, &proto_list, pos); 1879} 1880 1881static void proto_seq_stop(struct seq_file *seq, void *v) 1882{ 1883 read_unlock(&proto_list_lock); 1884} 1885 1886static char proto_method_implemented(const void *method) 1887{ 1888 return method == NULL ? 'n' : 'y'; 1889} 1890 1891static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1892{ 1893 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1894 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1895 proto->name, 1896 proto->obj_size, 1897 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1898 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1899 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1900 proto->max_header, 1901 proto->slab == NULL ? "no" : "yes", 1902 module_name(proto->owner), 1903 proto_method_implemented(proto->close), 1904 proto_method_implemented(proto->connect), 1905 proto_method_implemented(proto->disconnect), 1906 proto_method_implemented(proto->accept), 1907 proto_method_implemented(proto->ioctl), 1908 proto_method_implemented(proto->init), 1909 proto_method_implemented(proto->destroy), 1910 proto_method_implemented(proto->shutdown), 1911 proto_method_implemented(proto->setsockopt), 1912 proto_method_implemented(proto->getsockopt), 1913 proto_method_implemented(proto->sendmsg), 1914 proto_method_implemented(proto->recvmsg), 1915 proto_method_implemented(proto->sendpage), 1916 proto_method_implemented(proto->bind), 1917 proto_method_implemented(proto->backlog_rcv), 1918 proto_method_implemented(proto->hash), 1919 proto_method_implemented(proto->unhash), 1920 proto_method_implemented(proto->get_port), 1921 proto_method_implemented(proto->enter_memory_pressure)); 1922} 1923 1924static int proto_seq_show(struct seq_file *seq, void *v) 1925{ 1926 if (v == &proto_list) 1927 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1928 "protocol", 1929 "size", 1930 "sockets", 1931 "memory", 1932 "press", 1933 "maxhdr", 1934 "slab", 1935 "module", 1936 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1937 else 1938 proto_seq_printf(seq, list_entry(v, struct proto, node)); 1939 return 0; 1940} 1941 1942static const struct seq_operations proto_seq_ops = { 1943 .start = proto_seq_start, 1944 .next = proto_seq_next, 1945 .stop = proto_seq_stop, 1946 .show = proto_seq_show, 1947}; 1948 1949static int proto_seq_open(struct inode *inode, struct file *file) 1950{ 1951 return seq_open(file, &proto_seq_ops); 1952} 1953 1954static const struct file_operations proto_seq_fops = { 1955 .owner = THIS_MODULE, 1956 .open = proto_seq_open, 1957 .read = seq_read, 1958 .llseek = seq_lseek, 1959 .release = seq_release, 1960}; 1961 1962static int __init proto_init(void) 1963{ 1964 /* register /proc/net/protocols */ 1965 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1966} 1967 1968subsys_initcall(proto_init); 1969 1970#endif /* PROC_FS */ 1971 1972EXPORT_SYMBOL(sk_alloc); 1973EXPORT_SYMBOL(sk_free); 1974EXPORT_SYMBOL(sk_send_sigurg); 1975EXPORT_SYMBOL(sock_alloc_send_skb); 1976EXPORT_SYMBOL(sock_init_data); 1977EXPORT_SYMBOL(sock_kfree_s); 1978EXPORT_SYMBOL(sock_kmalloc); 1979EXPORT_SYMBOL(sock_no_accept); 1980EXPORT_SYMBOL(sock_no_bind); 1981EXPORT_SYMBOL(sock_no_connect); 1982EXPORT_SYMBOL(sock_no_getname); 1983EXPORT_SYMBOL(sock_no_getsockopt); 1984EXPORT_SYMBOL(sock_no_ioctl); 1985EXPORT_SYMBOL(sock_no_listen); 1986EXPORT_SYMBOL(sock_no_mmap); 1987EXPORT_SYMBOL(sock_no_poll); 1988EXPORT_SYMBOL(sock_no_recvmsg); 1989EXPORT_SYMBOL(sock_no_sendmsg); 1990EXPORT_SYMBOL(sock_no_sendpage); 1991EXPORT_SYMBOL(sock_no_setsockopt); 1992EXPORT_SYMBOL(sock_no_shutdown); 1993EXPORT_SYMBOL(sock_no_socketpair); 1994EXPORT_SYMBOL(sock_rfree); 1995EXPORT_SYMBOL(sock_setsockopt); 1996EXPORT_SYMBOL(sock_wfree); 1997EXPORT_SYMBOL(sock_wmalloc); 1998EXPORT_SYMBOL(sock_i_uid); 1999EXPORT_SYMBOL(sock_i_ino); 2000EXPORT_SYMBOL(sysctl_optmem_max); 2001#ifdef CONFIG_SYSCTL 2002EXPORT_SYMBOL(sysctl_rmem_max); 2003EXPORT_SYMBOL(sysctl_wmem_max); 2004#endif 2005