sock.c revision b7aa0bf70c4afb9e38be25f5c0922498d0f8684c
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-AF_MAX" 158}; 159static const char *af_family_slock_key_strings[AF_MAX+1] = { 160 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 161 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 162 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 163 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 164 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 165 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 166 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 167 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 168 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 169 "slock-27" , "slock-28" , "slock-29" , 170 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_MAX" 171}; 172#endif 173 174/* 175 * sk_callback_lock locking rules are per-address-family, 176 * so split the lock classes by using a per-AF key: 177 */ 178static struct lock_class_key af_callback_keys[AF_MAX]; 179 180/* Take into consideration the size of the struct sk_buff overhead in the 181 * determination of these values, since that is non-constant across 182 * platforms. This makes socket queueing behavior and performance 183 * not depend upon such differences. 184 */ 185#define _SK_MEM_PACKETS 256 186#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 187#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 188#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 189 190/* Run time adjustable parameters. */ 191__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 192__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 193__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 194__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 195 196/* Maximal space eaten by iovec or ancilliary data plus some space */ 197int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 198 199static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 200{ 201 struct timeval tv; 202 203 if (optlen < sizeof(tv)) 204 return -EINVAL; 205 if (copy_from_user(&tv, optval, sizeof(tv))) 206 return -EFAULT; 207 208 *timeo_p = MAX_SCHEDULE_TIMEOUT; 209 if (tv.tv_sec == 0 && tv.tv_usec == 0) 210 return 0; 211 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 212 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 213 return 0; 214} 215 216static void sock_warn_obsolete_bsdism(const char *name) 217{ 218 static int warned; 219 static char warncomm[TASK_COMM_LEN]; 220 if (strcmp(warncomm, current->comm) && warned < 5) { 221 strcpy(warncomm, current->comm); 222 printk(KERN_WARNING "process `%s' is using obsolete " 223 "%s SO_BSDCOMPAT\n", warncomm, name); 224 warned++; 225 } 226} 227 228static void sock_disable_timestamp(struct sock *sk) 229{ 230 if (sock_flag(sk, SOCK_TIMESTAMP)) { 231 sock_reset_flag(sk, SOCK_TIMESTAMP); 232 net_disable_timestamp(); 233 } 234} 235 236 237int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 238{ 239 int err = 0; 240 int skb_len; 241 242 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 243 number of warnings when compiling with -W --ANK 244 */ 245 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 246 (unsigned)sk->sk_rcvbuf) { 247 err = -ENOMEM; 248 goto out; 249 } 250 251 err = sk_filter(sk, skb); 252 if (err) 253 goto out; 254 255 skb->dev = NULL; 256 skb_set_owner_r(skb, sk); 257 258 /* Cache the SKB length before we tack it onto the receive 259 * queue. Once it is added it no longer belongs to us and 260 * may be freed by other threads of control pulling packets 261 * from the queue. 262 */ 263 skb_len = skb->len; 264 265 skb_queue_tail(&sk->sk_receive_queue, skb); 266 267 if (!sock_flag(sk, SOCK_DEAD)) 268 sk->sk_data_ready(sk, skb_len); 269out: 270 return err; 271} 272EXPORT_SYMBOL(sock_queue_rcv_skb); 273 274int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 275{ 276 int rc = NET_RX_SUCCESS; 277 278 if (sk_filter(sk, skb)) 279 goto discard_and_relse; 280 281 skb->dev = NULL; 282 283 if (nested) 284 bh_lock_sock_nested(sk); 285 else 286 bh_lock_sock(sk); 287 if (!sock_owned_by_user(sk)) { 288 /* 289 * trylock + unlock semantics: 290 */ 291 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 292 293 rc = sk->sk_backlog_rcv(sk, skb); 294 295 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 296 } else 297 sk_add_backlog(sk, skb); 298 bh_unlock_sock(sk); 299out: 300 sock_put(sk); 301 return rc; 302discard_and_relse: 303 kfree_skb(skb); 304 goto out; 305} 306EXPORT_SYMBOL(sk_receive_skb); 307 308struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 309{ 310 struct dst_entry *dst = sk->sk_dst_cache; 311 312 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 313 sk->sk_dst_cache = NULL; 314 dst_release(dst); 315 return NULL; 316 } 317 318 return dst; 319} 320EXPORT_SYMBOL(__sk_dst_check); 321 322struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 323{ 324 struct dst_entry *dst = sk_dst_get(sk); 325 326 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 327 sk_dst_reset(sk); 328 dst_release(dst); 329 return NULL; 330 } 331 332 return dst; 333} 334EXPORT_SYMBOL(sk_dst_check); 335 336/* 337 * This is meant for all protocols to use and covers goings on 338 * at the socket level. Everything here is generic. 339 */ 340 341int sock_setsockopt(struct socket *sock, int level, int optname, 342 char __user *optval, int optlen) 343{ 344 struct sock *sk=sock->sk; 345 struct sk_filter *filter; 346 int val; 347 int valbool; 348 struct linger ling; 349 int ret = 0; 350 351 /* 352 * Options without arguments 353 */ 354 355#ifdef SO_DONTLINGER /* Compatibility item... */ 356 if (optname == SO_DONTLINGER) { 357 lock_sock(sk); 358 sock_reset_flag(sk, SOCK_LINGER); 359 release_sock(sk); 360 return 0; 361 } 362#endif 363 364 if(optlen<sizeof(int)) 365 return(-EINVAL); 366 367 if (get_user(val, (int __user *)optval)) 368 return -EFAULT; 369 370 valbool = val?1:0; 371 372 lock_sock(sk); 373 374 switch(optname) 375 { 376 case SO_DEBUG: 377 if(val && !capable(CAP_NET_ADMIN)) 378 { 379 ret = -EACCES; 380 } 381 else if (valbool) 382 sock_set_flag(sk, SOCK_DBG); 383 else 384 sock_reset_flag(sk, SOCK_DBG); 385 break; 386 case SO_REUSEADDR: 387 sk->sk_reuse = valbool; 388 break; 389 case SO_TYPE: 390 case SO_ERROR: 391 ret = -ENOPROTOOPT; 392 break; 393 case SO_DONTROUTE: 394 if (valbool) 395 sock_set_flag(sk, SOCK_LOCALROUTE); 396 else 397 sock_reset_flag(sk, SOCK_LOCALROUTE); 398 break; 399 case SO_BROADCAST: 400 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 401 break; 402 case SO_SNDBUF: 403 /* Don't error on this BSD doesn't and if you think 404 about it this is right. Otherwise apps have to 405 play 'guess the biggest size' games. RCVBUF/SNDBUF 406 are treated in BSD as hints */ 407 408 if (val > sysctl_wmem_max) 409 val = sysctl_wmem_max; 410set_sndbuf: 411 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 412 if ((val * 2) < SOCK_MIN_SNDBUF) 413 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 414 else 415 sk->sk_sndbuf = val * 2; 416 417 /* 418 * Wake up sending tasks if we 419 * upped the value. 420 */ 421 sk->sk_write_space(sk); 422 break; 423 424 case SO_SNDBUFFORCE: 425 if (!capable(CAP_NET_ADMIN)) { 426 ret = -EPERM; 427 break; 428 } 429 goto set_sndbuf; 430 431 case SO_RCVBUF: 432 /* Don't error on this BSD doesn't and if you think 433 about it this is right. Otherwise apps have to 434 play 'guess the biggest size' games. RCVBUF/SNDBUF 435 are treated in BSD as hints */ 436 437 if (val > sysctl_rmem_max) 438 val = sysctl_rmem_max; 439set_rcvbuf: 440 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 441 /* 442 * We double it on the way in to account for 443 * "struct sk_buff" etc. overhead. Applications 444 * assume that the SO_RCVBUF setting they make will 445 * allow that much actual data to be received on that 446 * socket. 447 * 448 * Applications are unaware that "struct sk_buff" and 449 * other overheads allocate from the receive buffer 450 * during socket buffer allocation. 451 * 452 * And after considering the possible alternatives, 453 * returning the value we actually used in getsockopt 454 * is the most desirable behavior. 455 */ 456 if ((val * 2) < SOCK_MIN_RCVBUF) 457 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 458 else 459 sk->sk_rcvbuf = val * 2; 460 break; 461 462 case SO_RCVBUFFORCE: 463 if (!capable(CAP_NET_ADMIN)) { 464 ret = -EPERM; 465 break; 466 } 467 goto set_rcvbuf; 468 469 case SO_KEEPALIVE: 470#ifdef CONFIG_INET 471 if (sk->sk_protocol == IPPROTO_TCP) 472 tcp_set_keepalive(sk, valbool); 473#endif 474 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 475 break; 476 477 case SO_OOBINLINE: 478 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 479 break; 480 481 case SO_NO_CHECK: 482 sk->sk_no_check = valbool; 483 break; 484 485 case SO_PRIORITY: 486 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 487 sk->sk_priority = val; 488 else 489 ret = -EPERM; 490 break; 491 492 case SO_LINGER: 493 if(optlen<sizeof(ling)) { 494 ret = -EINVAL; /* 1003.1g */ 495 break; 496 } 497 if (copy_from_user(&ling,optval,sizeof(ling))) { 498 ret = -EFAULT; 499 break; 500 } 501 if (!ling.l_onoff) 502 sock_reset_flag(sk, SOCK_LINGER); 503 else { 504#if (BITS_PER_LONG == 32) 505 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 506 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 507 else 508#endif 509 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 510 sock_set_flag(sk, SOCK_LINGER); 511 } 512 break; 513 514 case SO_BSDCOMPAT: 515 sock_warn_obsolete_bsdism("setsockopt"); 516 break; 517 518 case SO_PASSCRED: 519 if (valbool) 520 set_bit(SOCK_PASSCRED, &sock->flags); 521 else 522 clear_bit(SOCK_PASSCRED, &sock->flags); 523 break; 524 525 case SO_TIMESTAMP: 526 if (valbool) { 527 sock_set_flag(sk, SOCK_RCVTSTAMP); 528 sock_enable_timestamp(sk); 529 } else 530 sock_reset_flag(sk, SOCK_RCVTSTAMP); 531 break; 532 533 case SO_RCVLOWAT: 534 if (val < 0) 535 val = INT_MAX; 536 sk->sk_rcvlowat = val ? : 1; 537 break; 538 539 case SO_RCVTIMEO: 540 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 541 break; 542 543 case SO_SNDTIMEO: 544 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 545 break; 546 547#ifdef CONFIG_NETDEVICES 548 case SO_BINDTODEVICE: 549 { 550 char devname[IFNAMSIZ]; 551 552 /* Sorry... */ 553 if (!capable(CAP_NET_RAW)) { 554 ret = -EPERM; 555 break; 556 } 557 558 /* Bind this socket to a particular device like "eth0", 559 * as specified in the passed interface name. If the 560 * name is "" or the option length is zero the socket 561 * is not bound. 562 */ 563 564 if (!valbool) { 565 sk->sk_bound_dev_if = 0; 566 } else { 567 if (optlen > IFNAMSIZ - 1) 568 optlen = IFNAMSIZ - 1; 569 memset(devname, 0, sizeof(devname)); 570 if (copy_from_user(devname, optval, optlen)) { 571 ret = -EFAULT; 572 break; 573 } 574 575 /* Remove any cached route for this socket. */ 576 sk_dst_reset(sk); 577 578 if (devname[0] == '\0') { 579 sk->sk_bound_dev_if = 0; 580 } else { 581 struct net_device *dev = dev_get_by_name(devname); 582 if (!dev) { 583 ret = -ENODEV; 584 break; 585 } 586 sk->sk_bound_dev_if = dev->ifindex; 587 dev_put(dev); 588 } 589 } 590 break; 591 } 592#endif 593 594 595 case SO_ATTACH_FILTER: 596 ret = -EINVAL; 597 if (optlen == sizeof(struct sock_fprog)) { 598 struct sock_fprog fprog; 599 600 ret = -EFAULT; 601 if (copy_from_user(&fprog, optval, sizeof(fprog))) 602 break; 603 604 ret = sk_attach_filter(&fprog, sk); 605 } 606 break; 607 608 case SO_DETACH_FILTER: 609 rcu_read_lock_bh(); 610 filter = rcu_dereference(sk->sk_filter); 611 if (filter) { 612 rcu_assign_pointer(sk->sk_filter, NULL); 613 sk_filter_release(sk, filter); 614 rcu_read_unlock_bh(); 615 break; 616 } 617 rcu_read_unlock_bh(); 618 ret = -ENONET; 619 break; 620 621 case SO_PASSSEC: 622 if (valbool) 623 set_bit(SOCK_PASSSEC, &sock->flags); 624 else 625 clear_bit(SOCK_PASSSEC, &sock->flags); 626 break; 627 628 /* We implement the SO_SNDLOWAT etc to 629 not be settable (1003.1g 5.3) */ 630 default: 631 ret = -ENOPROTOOPT; 632 break; 633 } 634 release_sock(sk); 635 return ret; 636} 637 638 639int sock_getsockopt(struct socket *sock, int level, int optname, 640 char __user *optval, int __user *optlen) 641{ 642 struct sock *sk = sock->sk; 643 644 union 645 { 646 int val; 647 struct linger ling; 648 struct timeval tm; 649 } v; 650 651 unsigned int lv = sizeof(int); 652 int len; 653 654 if(get_user(len,optlen)) 655 return -EFAULT; 656 if(len < 0) 657 return -EINVAL; 658 659 switch(optname) 660 { 661 case SO_DEBUG: 662 v.val = sock_flag(sk, SOCK_DBG); 663 break; 664 665 case SO_DONTROUTE: 666 v.val = sock_flag(sk, SOCK_LOCALROUTE); 667 break; 668 669 case SO_BROADCAST: 670 v.val = !!sock_flag(sk, SOCK_BROADCAST); 671 break; 672 673 case SO_SNDBUF: 674 v.val = sk->sk_sndbuf; 675 break; 676 677 case SO_RCVBUF: 678 v.val = sk->sk_rcvbuf; 679 break; 680 681 case SO_REUSEADDR: 682 v.val = sk->sk_reuse; 683 break; 684 685 case SO_KEEPALIVE: 686 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 687 break; 688 689 case SO_TYPE: 690 v.val = sk->sk_type; 691 break; 692 693 case SO_ERROR: 694 v.val = -sock_error(sk); 695 if(v.val==0) 696 v.val = xchg(&sk->sk_err_soft, 0); 697 break; 698 699 case SO_OOBINLINE: 700 v.val = !!sock_flag(sk, SOCK_URGINLINE); 701 break; 702 703 case SO_NO_CHECK: 704 v.val = sk->sk_no_check; 705 break; 706 707 case SO_PRIORITY: 708 v.val = sk->sk_priority; 709 break; 710 711 case SO_LINGER: 712 lv = sizeof(v.ling); 713 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 714 v.ling.l_linger = sk->sk_lingertime / HZ; 715 break; 716 717 case SO_BSDCOMPAT: 718 sock_warn_obsolete_bsdism("getsockopt"); 719 break; 720 721 case SO_TIMESTAMP: 722 v.val = sock_flag(sk, SOCK_RCVTSTAMP); 723 break; 724 725 case SO_RCVTIMEO: 726 lv=sizeof(struct timeval); 727 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 728 v.tm.tv_sec = 0; 729 v.tm.tv_usec = 0; 730 } else { 731 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 732 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 733 } 734 break; 735 736 case SO_SNDTIMEO: 737 lv=sizeof(struct timeval); 738 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 739 v.tm.tv_sec = 0; 740 v.tm.tv_usec = 0; 741 } else { 742 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 743 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 744 } 745 break; 746 747 case SO_RCVLOWAT: 748 v.val = sk->sk_rcvlowat; 749 break; 750 751 case SO_SNDLOWAT: 752 v.val=1; 753 break; 754 755 case SO_PASSCRED: 756 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 757 break; 758 759 case SO_PEERCRED: 760 if (len > sizeof(sk->sk_peercred)) 761 len = sizeof(sk->sk_peercred); 762 if (copy_to_user(optval, &sk->sk_peercred, len)) 763 return -EFAULT; 764 goto lenout; 765 766 case SO_PEERNAME: 767 { 768 char address[128]; 769 770 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 771 return -ENOTCONN; 772 if (lv < len) 773 return -EINVAL; 774 if (copy_to_user(optval, address, len)) 775 return -EFAULT; 776 goto lenout; 777 } 778 779 /* Dubious BSD thing... Probably nobody even uses it, but 780 * the UNIX standard wants it for whatever reason... -DaveM 781 */ 782 case SO_ACCEPTCONN: 783 v.val = sk->sk_state == TCP_LISTEN; 784 break; 785 786 case SO_PASSSEC: 787 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 788 break; 789 790 case SO_PEERSEC: 791 return security_socket_getpeersec_stream(sock, optval, optlen, len); 792 793 default: 794 return(-ENOPROTOOPT); 795 } 796 if (len > lv) 797 len = lv; 798 if (copy_to_user(optval, &v, len)) 799 return -EFAULT; 800lenout: 801 if (put_user(len, optlen)) 802 return -EFAULT; 803 return 0; 804} 805 806/* 807 * Initialize an sk_lock. 808 * 809 * (We also register the sk_lock with the lock validator.) 810 */ 811static inline void sock_lock_init(struct sock *sk) 812{ 813 sock_lock_init_class_and_name(sk, 814 af_family_slock_key_strings[sk->sk_family], 815 af_family_slock_keys + sk->sk_family, 816 af_family_key_strings[sk->sk_family], 817 af_family_keys + sk->sk_family); 818} 819 820/** 821 * sk_alloc - All socket objects are allocated here 822 * @family: protocol family 823 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 824 * @prot: struct proto associated with this new sock instance 825 * @zero_it: if we should zero the newly allocated sock 826 */ 827struct sock *sk_alloc(int family, gfp_t priority, 828 struct proto *prot, int zero_it) 829{ 830 struct sock *sk = NULL; 831 struct kmem_cache *slab = prot->slab; 832 833 if (slab != NULL) 834 sk = kmem_cache_alloc(slab, priority); 835 else 836 sk = kmalloc(prot->obj_size, priority); 837 838 if (sk) { 839 if (zero_it) { 840 memset(sk, 0, prot->obj_size); 841 sk->sk_family = family; 842 /* 843 * See comment in struct sock definition to understand 844 * why we need sk_prot_creator -acme 845 */ 846 sk->sk_prot = sk->sk_prot_creator = prot; 847 sock_lock_init(sk); 848 } 849 850 if (security_sk_alloc(sk, family, priority)) 851 goto out_free; 852 853 if (!try_module_get(prot->owner)) 854 goto out_free; 855 } 856 return sk; 857 858out_free: 859 if (slab != NULL) 860 kmem_cache_free(slab, sk); 861 else 862 kfree(sk); 863 return NULL; 864} 865 866void sk_free(struct sock *sk) 867{ 868 struct sk_filter *filter; 869 struct module *owner = sk->sk_prot_creator->owner; 870 871 if (sk->sk_destruct) 872 sk->sk_destruct(sk); 873 874 filter = rcu_dereference(sk->sk_filter); 875 if (filter) { 876 sk_filter_release(sk, filter); 877 rcu_assign_pointer(sk->sk_filter, NULL); 878 } 879 880 sock_disable_timestamp(sk); 881 882 if (atomic_read(&sk->sk_omem_alloc)) 883 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 884 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 885 886 security_sk_free(sk); 887 if (sk->sk_prot_creator->slab != NULL) 888 kmem_cache_free(sk->sk_prot_creator->slab, sk); 889 else 890 kfree(sk); 891 module_put(owner); 892} 893 894struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 895{ 896 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); 897 898 if (newsk != NULL) { 899 struct sk_filter *filter; 900 901 sock_copy(newsk, sk); 902 903 /* SANITY */ 904 sk_node_init(&newsk->sk_node); 905 sock_lock_init(newsk); 906 bh_lock_sock(newsk); 907 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 908 909 atomic_set(&newsk->sk_rmem_alloc, 0); 910 atomic_set(&newsk->sk_wmem_alloc, 0); 911 atomic_set(&newsk->sk_omem_alloc, 0); 912 skb_queue_head_init(&newsk->sk_receive_queue); 913 skb_queue_head_init(&newsk->sk_write_queue); 914#ifdef CONFIG_NET_DMA 915 skb_queue_head_init(&newsk->sk_async_wait_queue); 916#endif 917 918 rwlock_init(&newsk->sk_dst_lock); 919 rwlock_init(&newsk->sk_callback_lock); 920 lockdep_set_class(&newsk->sk_callback_lock, 921 af_callback_keys + newsk->sk_family); 922 923 newsk->sk_dst_cache = NULL; 924 newsk->sk_wmem_queued = 0; 925 newsk->sk_forward_alloc = 0; 926 newsk->sk_send_head = NULL; 927 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 928 929 sock_reset_flag(newsk, SOCK_DONE); 930 skb_queue_head_init(&newsk->sk_error_queue); 931 932 filter = newsk->sk_filter; 933 if (filter != NULL) 934 sk_filter_charge(newsk, filter); 935 936 if (unlikely(xfrm_sk_clone_policy(newsk))) { 937 /* It is still raw copy of parent, so invalidate 938 * destructor and make plain sk_free() */ 939 newsk->sk_destruct = NULL; 940 sk_free(newsk); 941 newsk = NULL; 942 goto out; 943 } 944 945 newsk->sk_err = 0; 946 newsk->sk_priority = 0; 947 atomic_set(&newsk->sk_refcnt, 2); 948 949 /* 950 * Increment the counter in the same struct proto as the master 951 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 952 * is the same as sk->sk_prot->socks, as this field was copied 953 * with memcpy). 954 * 955 * This _changes_ the previous behaviour, where 956 * tcp_create_openreq_child always was incrementing the 957 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 958 * to be taken into account in all callers. -acme 959 */ 960 sk_refcnt_debug_inc(newsk); 961 newsk->sk_socket = NULL; 962 newsk->sk_sleep = NULL; 963 964 if (newsk->sk_prot->sockets_allocated) 965 atomic_inc(newsk->sk_prot->sockets_allocated); 966 } 967out: 968 return newsk; 969} 970 971EXPORT_SYMBOL_GPL(sk_clone); 972 973void __init sk_init(void) 974{ 975 if (num_physpages <= 4096) { 976 sysctl_wmem_max = 32767; 977 sysctl_rmem_max = 32767; 978 sysctl_wmem_default = 32767; 979 sysctl_rmem_default = 32767; 980 } else if (num_physpages >= 131072) { 981 sysctl_wmem_max = 131071; 982 sysctl_rmem_max = 131071; 983 } 984} 985 986/* 987 * Simple resource managers for sockets. 988 */ 989 990 991/* 992 * Write buffer destructor automatically called from kfree_skb. 993 */ 994void sock_wfree(struct sk_buff *skb) 995{ 996 struct sock *sk = skb->sk; 997 998 /* In case it might be waiting for more memory. */ 999 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1000 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1001 sk->sk_write_space(sk); 1002 sock_put(sk); 1003} 1004 1005/* 1006 * Read buffer destructor automatically called from kfree_skb. 1007 */ 1008void sock_rfree(struct sk_buff *skb) 1009{ 1010 struct sock *sk = skb->sk; 1011 1012 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1013} 1014 1015 1016int sock_i_uid(struct sock *sk) 1017{ 1018 int uid; 1019 1020 read_lock(&sk->sk_callback_lock); 1021 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1022 read_unlock(&sk->sk_callback_lock); 1023 return uid; 1024} 1025 1026unsigned long sock_i_ino(struct sock *sk) 1027{ 1028 unsigned long ino; 1029 1030 read_lock(&sk->sk_callback_lock); 1031 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1032 read_unlock(&sk->sk_callback_lock); 1033 return ino; 1034} 1035 1036/* 1037 * Allocate a skb from the socket's send buffer. 1038 */ 1039struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1040 gfp_t priority) 1041{ 1042 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1043 struct sk_buff * skb = alloc_skb(size, priority); 1044 if (skb) { 1045 skb_set_owner_w(skb, sk); 1046 return skb; 1047 } 1048 } 1049 return NULL; 1050} 1051 1052/* 1053 * Allocate a skb from the socket's receive buffer. 1054 */ 1055struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1056 gfp_t priority) 1057{ 1058 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1059 struct sk_buff *skb = alloc_skb(size, priority); 1060 if (skb) { 1061 skb_set_owner_r(skb, sk); 1062 return skb; 1063 } 1064 } 1065 return NULL; 1066} 1067 1068/* 1069 * Allocate a memory block from the socket's option memory buffer. 1070 */ 1071void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1072{ 1073 if ((unsigned)size <= sysctl_optmem_max && 1074 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1075 void *mem; 1076 /* First do the add, to avoid the race if kmalloc 1077 * might sleep. 1078 */ 1079 atomic_add(size, &sk->sk_omem_alloc); 1080 mem = kmalloc(size, priority); 1081 if (mem) 1082 return mem; 1083 atomic_sub(size, &sk->sk_omem_alloc); 1084 } 1085 return NULL; 1086} 1087 1088/* 1089 * Free an option memory block. 1090 */ 1091void sock_kfree_s(struct sock *sk, void *mem, int size) 1092{ 1093 kfree(mem); 1094 atomic_sub(size, &sk->sk_omem_alloc); 1095} 1096 1097/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1098 I think, these locks should be removed for datagram sockets. 1099 */ 1100static long sock_wait_for_wmem(struct sock * sk, long timeo) 1101{ 1102 DEFINE_WAIT(wait); 1103 1104 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1105 for (;;) { 1106 if (!timeo) 1107 break; 1108 if (signal_pending(current)) 1109 break; 1110 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1111 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1112 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1113 break; 1114 if (sk->sk_shutdown & SEND_SHUTDOWN) 1115 break; 1116 if (sk->sk_err) 1117 break; 1118 timeo = schedule_timeout(timeo); 1119 } 1120 finish_wait(sk->sk_sleep, &wait); 1121 return timeo; 1122} 1123 1124 1125/* 1126 * Generic send/receive buffer handlers 1127 */ 1128 1129static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1130 unsigned long header_len, 1131 unsigned long data_len, 1132 int noblock, int *errcode) 1133{ 1134 struct sk_buff *skb; 1135 gfp_t gfp_mask; 1136 long timeo; 1137 int err; 1138 1139 gfp_mask = sk->sk_allocation; 1140 if (gfp_mask & __GFP_WAIT) 1141 gfp_mask |= __GFP_REPEAT; 1142 1143 timeo = sock_sndtimeo(sk, noblock); 1144 while (1) { 1145 err = sock_error(sk); 1146 if (err != 0) 1147 goto failure; 1148 1149 err = -EPIPE; 1150 if (sk->sk_shutdown & SEND_SHUTDOWN) 1151 goto failure; 1152 1153 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1154 skb = alloc_skb(header_len, gfp_mask); 1155 if (skb) { 1156 int npages; 1157 int i; 1158 1159 /* No pages, we're done... */ 1160 if (!data_len) 1161 break; 1162 1163 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1164 skb->truesize += data_len; 1165 skb_shinfo(skb)->nr_frags = npages; 1166 for (i = 0; i < npages; i++) { 1167 struct page *page; 1168 skb_frag_t *frag; 1169 1170 page = alloc_pages(sk->sk_allocation, 0); 1171 if (!page) { 1172 err = -ENOBUFS; 1173 skb_shinfo(skb)->nr_frags = i; 1174 kfree_skb(skb); 1175 goto failure; 1176 } 1177 1178 frag = &skb_shinfo(skb)->frags[i]; 1179 frag->page = page; 1180 frag->page_offset = 0; 1181 frag->size = (data_len >= PAGE_SIZE ? 1182 PAGE_SIZE : 1183 data_len); 1184 data_len -= PAGE_SIZE; 1185 } 1186 1187 /* Full success... */ 1188 break; 1189 } 1190 err = -ENOBUFS; 1191 goto failure; 1192 } 1193 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1194 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1195 err = -EAGAIN; 1196 if (!timeo) 1197 goto failure; 1198 if (signal_pending(current)) 1199 goto interrupted; 1200 timeo = sock_wait_for_wmem(sk, timeo); 1201 } 1202 1203 skb_set_owner_w(skb, sk); 1204 return skb; 1205 1206interrupted: 1207 err = sock_intr_errno(timeo); 1208failure: 1209 *errcode = err; 1210 return NULL; 1211} 1212 1213struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1214 int noblock, int *errcode) 1215{ 1216 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1217} 1218 1219static void __lock_sock(struct sock *sk) 1220{ 1221 DEFINE_WAIT(wait); 1222 1223 for(;;) { 1224 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1225 TASK_UNINTERRUPTIBLE); 1226 spin_unlock_bh(&sk->sk_lock.slock); 1227 schedule(); 1228 spin_lock_bh(&sk->sk_lock.slock); 1229 if(!sock_owned_by_user(sk)) 1230 break; 1231 } 1232 finish_wait(&sk->sk_lock.wq, &wait); 1233} 1234 1235static void __release_sock(struct sock *sk) 1236{ 1237 struct sk_buff *skb = sk->sk_backlog.head; 1238 1239 do { 1240 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1241 bh_unlock_sock(sk); 1242 1243 do { 1244 struct sk_buff *next = skb->next; 1245 1246 skb->next = NULL; 1247 sk->sk_backlog_rcv(sk, skb); 1248 1249 /* 1250 * We are in process context here with softirqs 1251 * disabled, use cond_resched_softirq() to preempt. 1252 * This is safe to do because we've taken the backlog 1253 * queue private: 1254 */ 1255 cond_resched_softirq(); 1256 1257 skb = next; 1258 } while (skb != NULL); 1259 1260 bh_lock_sock(sk); 1261 } while((skb = sk->sk_backlog.head) != NULL); 1262} 1263 1264/** 1265 * sk_wait_data - wait for data to arrive at sk_receive_queue 1266 * @sk: sock to wait on 1267 * @timeo: for how long 1268 * 1269 * Now socket state including sk->sk_err is changed only under lock, 1270 * hence we may omit checks after joining wait queue. 1271 * We check receive queue before schedule() only as optimization; 1272 * it is very likely that release_sock() added new data. 1273 */ 1274int sk_wait_data(struct sock *sk, long *timeo) 1275{ 1276 int rc; 1277 DEFINE_WAIT(wait); 1278 1279 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1280 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1281 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1282 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1283 finish_wait(sk->sk_sleep, &wait); 1284 return rc; 1285} 1286 1287EXPORT_SYMBOL(sk_wait_data); 1288 1289/* 1290 * Set of default routines for initialising struct proto_ops when 1291 * the protocol does not support a particular function. In certain 1292 * cases where it makes no sense for a protocol to have a "do nothing" 1293 * function, some default processing is provided. 1294 */ 1295 1296int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1297{ 1298 return -EOPNOTSUPP; 1299} 1300 1301int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1302 int len, int flags) 1303{ 1304 return -EOPNOTSUPP; 1305} 1306 1307int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1308{ 1309 return -EOPNOTSUPP; 1310} 1311 1312int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1313{ 1314 return -EOPNOTSUPP; 1315} 1316 1317int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1318 int *len, int peer) 1319{ 1320 return -EOPNOTSUPP; 1321} 1322 1323unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1324{ 1325 return 0; 1326} 1327 1328int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1329{ 1330 return -EOPNOTSUPP; 1331} 1332 1333int sock_no_listen(struct socket *sock, int backlog) 1334{ 1335 return -EOPNOTSUPP; 1336} 1337 1338int sock_no_shutdown(struct socket *sock, int how) 1339{ 1340 return -EOPNOTSUPP; 1341} 1342 1343int sock_no_setsockopt(struct socket *sock, int level, int optname, 1344 char __user *optval, int optlen) 1345{ 1346 return -EOPNOTSUPP; 1347} 1348 1349int sock_no_getsockopt(struct socket *sock, int level, int optname, 1350 char __user *optval, int __user *optlen) 1351{ 1352 return -EOPNOTSUPP; 1353} 1354 1355int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1356 size_t len) 1357{ 1358 return -EOPNOTSUPP; 1359} 1360 1361int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1362 size_t len, int flags) 1363{ 1364 return -EOPNOTSUPP; 1365} 1366 1367int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1368{ 1369 /* Mirror missing mmap method error code */ 1370 return -ENODEV; 1371} 1372 1373ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1374{ 1375 ssize_t res; 1376 struct msghdr msg = {.msg_flags = flags}; 1377 struct kvec iov; 1378 char *kaddr = kmap(page); 1379 iov.iov_base = kaddr + offset; 1380 iov.iov_len = size; 1381 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1382 kunmap(page); 1383 return res; 1384} 1385 1386/* 1387 * Default Socket Callbacks 1388 */ 1389 1390static void sock_def_wakeup(struct sock *sk) 1391{ 1392 read_lock(&sk->sk_callback_lock); 1393 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1394 wake_up_interruptible_all(sk->sk_sleep); 1395 read_unlock(&sk->sk_callback_lock); 1396} 1397 1398static void sock_def_error_report(struct sock *sk) 1399{ 1400 read_lock(&sk->sk_callback_lock); 1401 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1402 wake_up_interruptible(sk->sk_sleep); 1403 sk_wake_async(sk,0,POLL_ERR); 1404 read_unlock(&sk->sk_callback_lock); 1405} 1406 1407static void sock_def_readable(struct sock *sk, int len) 1408{ 1409 read_lock(&sk->sk_callback_lock); 1410 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1411 wake_up_interruptible(sk->sk_sleep); 1412 sk_wake_async(sk,1,POLL_IN); 1413 read_unlock(&sk->sk_callback_lock); 1414} 1415 1416static void sock_def_write_space(struct sock *sk) 1417{ 1418 read_lock(&sk->sk_callback_lock); 1419 1420 /* Do not wake up a writer until he can make "significant" 1421 * progress. --DaveM 1422 */ 1423 if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1424 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1425 wake_up_interruptible(sk->sk_sleep); 1426 1427 /* Should agree with poll, otherwise some programs break */ 1428 if (sock_writeable(sk)) 1429 sk_wake_async(sk, 2, POLL_OUT); 1430 } 1431 1432 read_unlock(&sk->sk_callback_lock); 1433} 1434 1435static void sock_def_destruct(struct sock *sk) 1436{ 1437 kfree(sk->sk_protinfo); 1438} 1439 1440void sk_send_sigurg(struct sock *sk) 1441{ 1442 if (sk->sk_socket && sk->sk_socket->file) 1443 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1444 sk_wake_async(sk, 3, POLL_PRI); 1445} 1446 1447void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1448 unsigned long expires) 1449{ 1450 if (!mod_timer(timer, expires)) 1451 sock_hold(sk); 1452} 1453 1454EXPORT_SYMBOL(sk_reset_timer); 1455 1456void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1457{ 1458 if (timer_pending(timer) && del_timer(timer)) 1459 __sock_put(sk); 1460} 1461 1462EXPORT_SYMBOL(sk_stop_timer); 1463 1464void sock_init_data(struct socket *sock, struct sock *sk) 1465{ 1466 skb_queue_head_init(&sk->sk_receive_queue); 1467 skb_queue_head_init(&sk->sk_write_queue); 1468 skb_queue_head_init(&sk->sk_error_queue); 1469#ifdef CONFIG_NET_DMA 1470 skb_queue_head_init(&sk->sk_async_wait_queue); 1471#endif 1472 1473 sk->sk_send_head = NULL; 1474 1475 init_timer(&sk->sk_timer); 1476 1477 sk->sk_allocation = GFP_KERNEL; 1478 sk->sk_rcvbuf = sysctl_rmem_default; 1479 sk->sk_sndbuf = sysctl_wmem_default; 1480 sk->sk_state = TCP_CLOSE; 1481 sk->sk_socket = sock; 1482 1483 sock_set_flag(sk, SOCK_ZAPPED); 1484 1485 if(sock) 1486 { 1487 sk->sk_type = sock->type; 1488 sk->sk_sleep = &sock->wait; 1489 sock->sk = sk; 1490 } else 1491 sk->sk_sleep = NULL; 1492 1493 rwlock_init(&sk->sk_dst_lock); 1494 rwlock_init(&sk->sk_callback_lock); 1495 lockdep_set_class(&sk->sk_callback_lock, 1496 af_callback_keys + sk->sk_family); 1497 1498 sk->sk_state_change = sock_def_wakeup; 1499 sk->sk_data_ready = sock_def_readable; 1500 sk->sk_write_space = sock_def_write_space; 1501 sk->sk_error_report = sock_def_error_report; 1502 sk->sk_destruct = sock_def_destruct; 1503 1504 sk->sk_sndmsg_page = NULL; 1505 sk->sk_sndmsg_off = 0; 1506 1507 sk->sk_peercred.pid = 0; 1508 sk->sk_peercred.uid = -1; 1509 sk->sk_peercred.gid = -1; 1510 sk->sk_write_pending = 0; 1511 sk->sk_rcvlowat = 1; 1512 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1513 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1514 1515 sk->sk_stamp = ktime_set(-1L, -1L); 1516 1517 atomic_set(&sk->sk_refcnt, 1); 1518} 1519 1520void fastcall lock_sock_nested(struct sock *sk, int subclass) 1521{ 1522 might_sleep(); 1523 spin_lock_bh(&sk->sk_lock.slock); 1524 if (sk->sk_lock.owner) 1525 __lock_sock(sk); 1526 sk->sk_lock.owner = (void *)1; 1527 spin_unlock(&sk->sk_lock.slock); 1528 /* 1529 * The sk_lock has mutex_lock() semantics here: 1530 */ 1531 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1532 local_bh_enable(); 1533} 1534 1535EXPORT_SYMBOL(lock_sock_nested); 1536 1537void fastcall release_sock(struct sock *sk) 1538{ 1539 /* 1540 * The sk_lock has mutex_unlock() semantics: 1541 */ 1542 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1543 1544 spin_lock_bh(&sk->sk_lock.slock); 1545 if (sk->sk_backlog.tail) 1546 __release_sock(sk); 1547 sk->sk_lock.owner = NULL; 1548 if (waitqueue_active(&sk->sk_lock.wq)) 1549 wake_up(&sk->sk_lock.wq); 1550 spin_unlock_bh(&sk->sk_lock.slock); 1551} 1552EXPORT_SYMBOL(release_sock); 1553 1554int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1555{ 1556 struct timeval tv; 1557 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1558 sock_enable_timestamp(sk); 1559 tv = ktime_to_timeval(sk->sk_stamp); 1560 if (tv.tv_sec == -1) 1561 return -ENOENT; 1562 if (tv.tv_sec == 0) { 1563 sk->sk_stamp = ktime_get_real(); 1564 tv = ktime_to_timeval(sk->sk_stamp); 1565 } 1566 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1567} 1568EXPORT_SYMBOL(sock_get_timestamp); 1569 1570void sock_enable_timestamp(struct sock *sk) 1571{ 1572 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1573 sock_set_flag(sk, SOCK_TIMESTAMP); 1574 net_enable_timestamp(); 1575 } 1576} 1577EXPORT_SYMBOL(sock_enable_timestamp); 1578 1579/* 1580 * Get a socket option on an socket. 1581 * 1582 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1583 * asynchronous errors should be reported by getsockopt. We assume 1584 * this means if you specify SO_ERROR (otherwise whats the point of it). 1585 */ 1586int sock_common_getsockopt(struct socket *sock, int level, int optname, 1587 char __user *optval, int __user *optlen) 1588{ 1589 struct sock *sk = sock->sk; 1590 1591 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1592} 1593 1594EXPORT_SYMBOL(sock_common_getsockopt); 1595 1596#ifdef CONFIG_COMPAT 1597int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1598 char __user *optval, int __user *optlen) 1599{ 1600 struct sock *sk = sock->sk; 1601 1602 if (sk->sk_prot->compat_getsockopt != NULL) 1603 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1604 optval, optlen); 1605 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1606} 1607EXPORT_SYMBOL(compat_sock_common_getsockopt); 1608#endif 1609 1610int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1611 struct msghdr *msg, size_t size, int flags) 1612{ 1613 struct sock *sk = sock->sk; 1614 int addr_len = 0; 1615 int err; 1616 1617 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1618 flags & ~MSG_DONTWAIT, &addr_len); 1619 if (err >= 0) 1620 msg->msg_namelen = addr_len; 1621 return err; 1622} 1623 1624EXPORT_SYMBOL(sock_common_recvmsg); 1625 1626/* 1627 * Set socket options on an inet socket. 1628 */ 1629int sock_common_setsockopt(struct socket *sock, int level, int optname, 1630 char __user *optval, int optlen) 1631{ 1632 struct sock *sk = sock->sk; 1633 1634 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1635} 1636 1637EXPORT_SYMBOL(sock_common_setsockopt); 1638 1639#ifdef CONFIG_COMPAT 1640int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1641 char __user *optval, int optlen) 1642{ 1643 struct sock *sk = sock->sk; 1644 1645 if (sk->sk_prot->compat_setsockopt != NULL) 1646 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1647 optval, optlen); 1648 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1649} 1650EXPORT_SYMBOL(compat_sock_common_setsockopt); 1651#endif 1652 1653void sk_common_release(struct sock *sk) 1654{ 1655 if (sk->sk_prot->destroy) 1656 sk->sk_prot->destroy(sk); 1657 1658 /* 1659 * Observation: when sock_common_release is called, processes have 1660 * no access to socket. But net still has. 1661 * Step one, detach it from networking: 1662 * 1663 * A. Remove from hash tables. 1664 */ 1665 1666 sk->sk_prot->unhash(sk); 1667 1668 /* 1669 * In this point socket cannot receive new packets, but it is possible 1670 * that some packets are in flight because some CPU runs receiver and 1671 * did hash table lookup before we unhashed socket. They will achieve 1672 * receive queue and will be purged by socket destructor. 1673 * 1674 * Also we still have packets pending on receive queue and probably, 1675 * our own packets waiting in device queues. sock_destroy will drain 1676 * receive queue, but transmitted packets will delay socket destruction 1677 * until the last reference will be released. 1678 */ 1679 1680 sock_orphan(sk); 1681 1682 xfrm_sk_free_policy(sk); 1683 1684 sk_refcnt_debug_release(sk); 1685 sock_put(sk); 1686} 1687 1688EXPORT_SYMBOL(sk_common_release); 1689 1690static DEFINE_RWLOCK(proto_list_lock); 1691static LIST_HEAD(proto_list); 1692 1693int proto_register(struct proto *prot, int alloc_slab) 1694{ 1695 char *request_sock_slab_name = NULL; 1696 char *timewait_sock_slab_name; 1697 int rc = -ENOBUFS; 1698 1699 if (alloc_slab) { 1700 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1701 SLAB_HWCACHE_ALIGN, NULL, NULL); 1702 1703 if (prot->slab == NULL) { 1704 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1705 prot->name); 1706 goto out; 1707 } 1708 1709 if (prot->rsk_prot != NULL) { 1710 static const char mask[] = "request_sock_%s"; 1711 1712 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1713 if (request_sock_slab_name == NULL) 1714 goto out_free_sock_slab; 1715 1716 sprintf(request_sock_slab_name, mask, prot->name); 1717 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1718 prot->rsk_prot->obj_size, 0, 1719 SLAB_HWCACHE_ALIGN, NULL, NULL); 1720 1721 if (prot->rsk_prot->slab == NULL) { 1722 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1723 prot->name); 1724 goto out_free_request_sock_slab_name; 1725 } 1726 } 1727 1728 if (prot->twsk_prot != NULL) { 1729 static const char mask[] = "tw_sock_%s"; 1730 1731 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1732 1733 if (timewait_sock_slab_name == NULL) 1734 goto out_free_request_sock_slab; 1735 1736 sprintf(timewait_sock_slab_name, mask, prot->name); 1737 prot->twsk_prot->twsk_slab = 1738 kmem_cache_create(timewait_sock_slab_name, 1739 prot->twsk_prot->twsk_obj_size, 1740 0, SLAB_HWCACHE_ALIGN, 1741 NULL, NULL); 1742 if (prot->twsk_prot->twsk_slab == NULL) 1743 goto out_free_timewait_sock_slab_name; 1744 } 1745 } 1746 1747 write_lock(&proto_list_lock); 1748 list_add(&prot->node, &proto_list); 1749 write_unlock(&proto_list_lock); 1750 rc = 0; 1751out: 1752 return rc; 1753out_free_timewait_sock_slab_name: 1754 kfree(timewait_sock_slab_name); 1755out_free_request_sock_slab: 1756 if (prot->rsk_prot && prot->rsk_prot->slab) { 1757 kmem_cache_destroy(prot->rsk_prot->slab); 1758 prot->rsk_prot->slab = NULL; 1759 } 1760out_free_request_sock_slab_name: 1761 kfree(request_sock_slab_name); 1762out_free_sock_slab: 1763 kmem_cache_destroy(prot->slab); 1764 prot->slab = NULL; 1765 goto out; 1766} 1767 1768EXPORT_SYMBOL(proto_register); 1769 1770void proto_unregister(struct proto *prot) 1771{ 1772 write_lock(&proto_list_lock); 1773 list_del(&prot->node); 1774 write_unlock(&proto_list_lock); 1775 1776 if (prot->slab != NULL) { 1777 kmem_cache_destroy(prot->slab); 1778 prot->slab = NULL; 1779 } 1780 1781 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1782 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1783 1784 kmem_cache_destroy(prot->rsk_prot->slab); 1785 kfree(name); 1786 prot->rsk_prot->slab = NULL; 1787 } 1788 1789 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1790 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1791 1792 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1793 kfree(name); 1794 prot->twsk_prot->twsk_slab = NULL; 1795 } 1796} 1797 1798EXPORT_SYMBOL(proto_unregister); 1799 1800#ifdef CONFIG_PROC_FS 1801static inline struct proto *__proto_head(void) 1802{ 1803 return list_entry(proto_list.next, struct proto, node); 1804} 1805 1806static inline struct proto *proto_head(void) 1807{ 1808 return list_empty(&proto_list) ? NULL : __proto_head(); 1809} 1810 1811static inline struct proto *proto_next(struct proto *proto) 1812{ 1813 return proto->node.next == &proto_list ? NULL : 1814 list_entry(proto->node.next, struct proto, node); 1815} 1816 1817static inline struct proto *proto_get_idx(loff_t pos) 1818{ 1819 struct proto *proto; 1820 loff_t i = 0; 1821 1822 list_for_each_entry(proto, &proto_list, node) 1823 if (i++ == pos) 1824 goto out; 1825 1826 proto = NULL; 1827out: 1828 return proto; 1829} 1830 1831static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1832{ 1833 read_lock(&proto_list_lock); 1834 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; 1835} 1836 1837static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1838{ 1839 ++*pos; 1840 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); 1841} 1842 1843static void proto_seq_stop(struct seq_file *seq, void *v) 1844{ 1845 read_unlock(&proto_list_lock); 1846} 1847 1848static char proto_method_implemented(const void *method) 1849{ 1850 return method == NULL ? 'n' : 'y'; 1851} 1852 1853static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1854{ 1855 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1856 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1857 proto->name, 1858 proto->obj_size, 1859 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1860 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1861 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1862 proto->max_header, 1863 proto->slab == NULL ? "no" : "yes", 1864 module_name(proto->owner), 1865 proto_method_implemented(proto->close), 1866 proto_method_implemented(proto->connect), 1867 proto_method_implemented(proto->disconnect), 1868 proto_method_implemented(proto->accept), 1869 proto_method_implemented(proto->ioctl), 1870 proto_method_implemented(proto->init), 1871 proto_method_implemented(proto->destroy), 1872 proto_method_implemented(proto->shutdown), 1873 proto_method_implemented(proto->setsockopt), 1874 proto_method_implemented(proto->getsockopt), 1875 proto_method_implemented(proto->sendmsg), 1876 proto_method_implemented(proto->recvmsg), 1877 proto_method_implemented(proto->sendpage), 1878 proto_method_implemented(proto->bind), 1879 proto_method_implemented(proto->backlog_rcv), 1880 proto_method_implemented(proto->hash), 1881 proto_method_implemented(proto->unhash), 1882 proto_method_implemented(proto->get_port), 1883 proto_method_implemented(proto->enter_memory_pressure)); 1884} 1885 1886static int proto_seq_show(struct seq_file *seq, void *v) 1887{ 1888 if (v == SEQ_START_TOKEN) 1889 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1890 "protocol", 1891 "size", 1892 "sockets", 1893 "memory", 1894 "press", 1895 "maxhdr", 1896 "slab", 1897 "module", 1898 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1899 else 1900 proto_seq_printf(seq, v); 1901 return 0; 1902} 1903 1904static struct seq_operations proto_seq_ops = { 1905 .start = proto_seq_start, 1906 .next = proto_seq_next, 1907 .stop = proto_seq_stop, 1908 .show = proto_seq_show, 1909}; 1910 1911static int proto_seq_open(struct inode *inode, struct file *file) 1912{ 1913 return seq_open(file, &proto_seq_ops); 1914} 1915 1916static const struct file_operations proto_seq_fops = { 1917 .owner = THIS_MODULE, 1918 .open = proto_seq_open, 1919 .read = seq_read, 1920 .llseek = seq_lseek, 1921 .release = seq_release, 1922}; 1923 1924static int __init proto_init(void) 1925{ 1926 /* register /proc/net/protocols */ 1927 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1928} 1929 1930subsys_initcall(proto_init); 1931 1932#endif /* PROC_FS */ 1933 1934EXPORT_SYMBOL(sk_alloc); 1935EXPORT_SYMBOL(sk_free); 1936EXPORT_SYMBOL(sk_send_sigurg); 1937EXPORT_SYMBOL(sock_alloc_send_skb); 1938EXPORT_SYMBOL(sock_init_data); 1939EXPORT_SYMBOL(sock_kfree_s); 1940EXPORT_SYMBOL(sock_kmalloc); 1941EXPORT_SYMBOL(sock_no_accept); 1942EXPORT_SYMBOL(sock_no_bind); 1943EXPORT_SYMBOL(sock_no_connect); 1944EXPORT_SYMBOL(sock_no_getname); 1945EXPORT_SYMBOL(sock_no_getsockopt); 1946EXPORT_SYMBOL(sock_no_ioctl); 1947EXPORT_SYMBOL(sock_no_listen); 1948EXPORT_SYMBOL(sock_no_mmap); 1949EXPORT_SYMBOL(sock_no_poll); 1950EXPORT_SYMBOL(sock_no_recvmsg); 1951EXPORT_SYMBOL(sock_no_sendmsg); 1952EXPORT_SYMBOL(sock_no_sendpage); 1953EXPORT_SYMBOL(sock_no_setsockopt); 1954EXPORT_SYMBOL(sock_no_shutdown); 1955EXPORT_SYMBOL(sock_no_socketpair); 1956EXPORT_SYMBOL(sock_rfree); 1957EXPORT_SYMBOL(sock_setsockopt); 1958EXPORT_SYMBOL(sock_wfree); 1959EXPORT_SYMBOL(sock_wmalloc); 1960EXPORT_SYMBOL(sock_i_uid); 1961EXPORT_SYMBOL(sock_i_ino); 1962EXPORT_SYMBOL(sysctl_optmem_max); 1963#ifdef CONFIG_SYSCTL 1964EXPORT_SYMBOL(sysctl_rmem_max); 1965EXPORT_SYMBOL(sysctl_wmem_max); 1966#endif 1967