sock.c revision f690808e17925fc45217eb22e8670902ecee5c1b
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 case SO_DEBUG: 376 if (val && !capable(CAP_NET_ADMIN)) { 377 ret = -EACCES; 378 } 379 else if (valbool) 380 sock_set_flag(sk, SOCK_DBG); 381 else 382 sock_reset_flag(sk, SOCK_DBG); 383 break; 384 case SO_REUSEADDR: 385 sk->sk_reuse = valbool; 386 break; 387 case SO_TYPE: 388 case SO_ERROR: 389 ret = -ENOPROTOOPT; 390 break; 391 case SO_DONTROUTE: 392 if (valbool) 393 sock_set_flag(sk, SOCK_LOCALROUTE); 394 else 395 sock_reset_flag(sk, SOCK_LOCALROUTE); 396 break; 397 case SO_BROADCAST: 398 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 399 break; 400 case SO_SNDBUF: 401 /* Don't error on this BSD doesn't and if you think 402 about it this is right. Otherwise apps have to 403 play 'guess the biggest size' games. RCVBUF/SNDBUF 404 are treated in BSD as hints */ 405 406 if (val > sysctl_wmem_max) 407 val = sysctl_wmem_max; 408set_sndbuf: 409 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 410 if ((val * 2) < SOCK_MIN_SNDBUF) 411 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 412 else 413 sk->sk_sndbuf = val * 2; 414 415 /* 416 * Wake up sending tasks if we 417 * upped the value. 418 */ 419 sk->sk_write_space(sk); 420 break; 421 422 case SO_SNDBUFFORCE: 423 if (!capable(CAP_NET_ADMIN)) { 424 ret = -EPERM; 425 break; 426 } 427 goto set_sndbuf; 428 429 case SO_RCVBUF: 430 /* Don't error on this BSD doesn't and if you think 431 about it this is right. Otherwise apps have to 432 play 'guess the biggest size' games. RCVBUF/SNDBUF 433 are treated in BSD as hints */ 434 435 if (val > sysctl_rmem_max) 436 val = sysctl_rmem_max; 437set_rcvbuf: 438 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 439 /* 440 * We double it on the way in to account for 441 * "struct sk_buff" etc. overhead. Applications 442 * assume that the SO_RCVBUF setting they make will 443 * allow that much actual data to be received on that 444 * socket. 445 * 446 * Applications are unaware that "struct sk_buff" and 447 * other overheads allocate from the receive buffer 448 * during socket buffer allocation. 449 * 450 * And after considering the possible alternatives, 451 * returning the value we actually used in getsockopt 452 * is the most desirable behavior. 453 */ 454 if ((val * 2) < SOCK_MIN_RCVBUF) 455 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 456 else 457 sk->sk_rcvbuf = val * 2; 458 break; 459 460 case SO_RCVBUFFORCE: 461 if (!capable(CAP_NET_ADMIN)) { 462 ret = -EPERM; 463 break; 464 } 465 goto set_rcvbuf; 466 467 case SO_KEEPALIVE: 468#ifdef CONFIG_INET 469 if (sk->sk_protocol == IPPROTO_TCP) 470 tcp_set_keepalive(sk, valbool); 471#endif 472 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 473 break; 474 475 case SO_OOBINLINE: 476 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 477 break; 478 479 case SO_NO_CHECK: 480 sk->sk_no_check = valbool; 481 break; 482 483 case SO_PRIORITY: 484 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 485 sk->sk_priority = val; 486 else 487 ret = -EPERM; 488 break; 489 490 case SO_LINGER: 491 if (optlen < sizeof(ling)) { 492 ret = -EINVAL; /* 1003.1g */ 493 break; 494 } 495 if (copy_from_user(&ling,optval,sizeof(ling))) { 496 ret = -EFAULT; 497 break; 498 } 499 if (!ling.l_onoff) 500 sock_reset_flag(sk, SOCK_LINGER); 501 else { 502#if (BITS_PER_LONG == 32) 503 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 504 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 505 else 506#endif 507 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 508 sock_set_flag(sk, SOCK_LINGER); 509 } 510 break; 511 512 case SO_BSDCOMPAT: 513 sock_warn_obsolete_bsdism("setsockopt"); 514 break; 515 516 case SO_PASSCRED: 517 if (valbool) 518 set_bit(SOCK_PASSCRED, &sock->flags); 519 else 520 clear_bit(SOCK_PASSCRED, &sock->flags); 521 break; 522 523 case SO_TIMESTAMP: 524 case SO_TIMESTAMPNS: 525 if (valbool) { 526 if (optname == SO_TIMESTAMP) 527 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 528 else 529 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 530 sock_set_flag(sk, SOCK_RCVTSTAMP); 531 sock_enable_timestamp(sk); 532 } else { 533 sock_reset_flag(sk, SOCK_RCVTSTAMP); 534 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 535 } 536 break; 537 538 case SO_RCVLOWAT: 539 if (val < 0) 540 val = INT_MAX; 541 sk->sk_rcvlowat = val ? : 1; 542 break; 543 544 case SO_RCVTIMEO: 545 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 546 break; 547 548 case SO_SNDTIMEO: 549 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 550 break; 551 552#ifdef CONFIG_NETDEVICES 553 case SO_BINDTODEVICE: 554 { 555 char devname[IFNAMSIZ]; 556 557 /* Sorry... */ 558 if (!capable(CAP_NET_RAW)) { 559 ret = -EPERM; 560 break; 561 } 562 563 /* Bind this socket to a particular device like "eth0", 564 * as specified in the passed interface name. If the 565 * name is "" or the option length is zero the socket 566 * is not bound. 567 */ 568 569 if (!valbool) { 570 sk->sk_bound_dev_if = 0; 571 } else { 572 if (optlen > IFNAMSIZ - 1) 573 optlen = IFNAMSIZ - 1; 574 memset(devname, 0, sizeof(devname)); 575 if (copy_from_user(devname, optval, optlen)) { 576 ret = -EFAULT; 577 break; 578 } 579 580 /* Remove any cached route for this socket. */ 581 sk_dst_reset(sk); 582 583 if (devname[0] == '\0') { 584 sk->sk_bound_dev_if = 0; 585 } else { 586 struct net_device *dev = dev_get_by_name(devname); 587 if (!dev) { 588 ret = -ENODEV; 589 break; 590 } 591 sk->sk_bound_dev_if = dev->ifindex; 592 dev_put(dev); 593 } 594 } 595 break; 596 } 597#endif 598 599 600 case SO_ATTACH_FILTER: 601 ret = -EINVAL; 602 if (optlen == sizeof(struct sock_fprog)) { 603 struct sock_fprog fprog; 604 605 ret = -EFAULT; 606 if (copy_from_user(&fprog, optval, sizeof(fprog))) 607 break; 608 609 ret = sk_attach_filter(&fprog, sk); 610 } 611 break; 612 613 case SO_DETACH_FILTER: 614 rcu_read_lock_bh(); 615 filter = rcu_dereference(sk->sk_filter); 616 if (filter) { 617 rcu_assign_pointer(sk->sk_filter, NULL); 618 sk_filter_release(sk, filter); 619 rcu_read_unlock_bh(); 620 break; 621 } 622 rcu_read_unlock_bh(); 623 ret = -ENONET; 624 break; 625 626 case SO_PASSSEC: 627 if (valbool) 628 set_bit(SOCK_PASSSEC, &sock->flags); 629 else 630 clear_bit(SOCK_PASSSEC, &sock->flags); 631 break; 632 633 /* We implement the SO_SNDLOWAT etc to 634 not be settable (1003.1g 5.3) */ 635 default: 636 ret = -ENOPROTOOPT; 637 break; 638 } 639 release_sock(sk); 640 return ret; 641} 642 643 644int sock_getsockopt(struct socket *sock, int level, int optname, 645 char __user *optval, int __user *optlen) 646{ 647 struct sock *sk = sock->sk; 648 649 union { 650 int val; 651 struct linger ling; 652 struct timeval tm; 653 } v; 654 655 unsigned int lv = sizeof(int); 656 int len; 657 658 if (get_user(len, optlen)) 659 return -EFAULT; 660 if (len < 0) 661 return -EINVAL; 662 663 switch(optname) { 664 case SO_DEBUG: 665 v.val = sock_flag(sk, SOCK_DBG); 666 break; 667 668 case SO_DONTROUTE: 669 v.val = sock_flag(sk, SOCK_LOCALROUTE); 670 break; 671 672 case SO_BROADCAST: 673 v.val = !!sock_flag(sk, SOCK_BROADCAST); 674 break; 675 676 case SO_SNDBUF: 677 v.val = sk->sk_sndbuf; 678 break; 679 680 case SO_RCVBUF: 681 v.val = sk->sk_rcvbuf; 682 break; 683 684 case SO_REUSEADDR: 685 v.val = sk->sk_reuse; 686 break; 687 688 case SO_KEEPALIVE: 689 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 690 break; 691 692 case SO_TYPE: 693 v.val = sk->sk_type; 694 break; 695 696 case SO_ERROR: 697 v.val = -sock_error(sk); 698 if (v.val==0) 699 v.val = xchg(&sk->sk_err_soft, 0); 700 break; 701 702 case SO_OOBINLINE: 703 v.val = !!sock_flag(sk, SOCK_URGINLINE); 704 break; 705 706 case SO_NO_CHECK: 707 v.val = sk->sk_no_check; 708 break; 709 710 case SO_PRIORITY: 711 v.val = sk->sk_priority; 712 break; 713 714 case SO_LINGER: 715 lv = sizeof(v.ling); 716 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 717 v.ling.l_linger = sk->sk_lingertime / HZ; 718 break; 719 720 case SO_BSDCOMPAT: 721 sock_warn_obsolete_bsdism("getsockopt"); 722 break; 723 724 case SO_TIMESTAMP: 725 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 726 !sock_flag(sk, SOCK_RCVTSTAMPNS); 727 break; 728 729 case SO_TIMESTAMPNS: 730 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 731 break; 732 733 case SO_RCVTIMEO: 734 lv=sizeof(struct timeval); 735 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 736 v.tm.tv_sec = 0; 737 v.tm.tv_usec = 0; 738 } else { 739 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 740 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 741 } 742 break; 743 744 case SO_SNDTIMEO: 745 lv=sizeof(struct timeval); 746 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 747 v.tm.tv_sec = 0; 748 v.tm.tv_usec = 0; 749 } else { 750 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 751 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 752 } 753 break; 754 755 case SO_RCVLOWAT: 756 v.val = sk->sk_rcvlowat; 757 break; 758 759 case SO_SNDLOWAT: 760 v.val=1; 761 break; 762 763 case SO_PASSCRED: 764 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 765 break; 766 767 case SO_PEERCRED: 768 if (len > sizeof(sk->sk_peercred)) 769 len = sizeof(sk->sk_peercred); 770 if (copy_to_user(optval, &sk->sk_peercred, len)) 771 return -EFAULT; 772 goto lenout; 773 774 case SO_PEERNAME: 775 { 776 char address[128]; 777 778 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 779 return -ENOTCONN; 780 if (lv < len) 781 return -EINVAL; 782 if (copy_to_user(optval, address, len)) 783 return -EFAULT; 784 goto lenout; 785 } 786 787 /* Dubious BSD thing... Probably nobody even uses it, but 788 * the UNIX standard wants it for whatever reason... -DaveM 789 */ 790 case SO_ACCEPTCONN: 791 v.val = sk->sk_state == TCP_LISTEN; 792 break; 793 794 case SO_PASSSEC: 795 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 796 break; 797 798 case SO_PEERSEC: 799 return security_socket_getpeersec_stream(sock, optval, optlen, len); 800 801 default: 802 return -ENOPROTOOPT; 803 } 804 805 if (len > lv) 806 len = lv; 807 if (copy_to_user(optval, &v, len)) 808 return -EFAULT; 809lenout: 810 if (put_user(len, optlen)) 811 return -EFAULT; 812 return 0; 813} 814 815/* 816 * Initialize an sk_lock. 817 * 818 * (We also register the sk_lock with the lock validator.) 819 */ 820static inline void sock_lock_init(struct sock *sk) 821{ 822 sock_lock_init_class_and_name(sk, 823 af_family_slock_key_strings[sk->sk_family], 824 af_family_slock_keys + sk->sk_family, 825 af_family_key_strings[sk->sk_family], 826 af_family_keys + sk->sk_family); 827} 828 829/** 830 * sk_alloc - All socket objects are allocated here 831 * @family: protocol family 832 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 833 * @prot: struct proto associated with this new sock instance 834 * @zero_it: if we should zero the newly allocated sock 835 */ 836struct sock *sk_alloc(int family, gfp_t priority, 837 struct proto *prot, int zero_it) 838{ 839 struct sock *sk = NULL; 840 struct kmem_cache *slab = prot->slab; 841 842 if (slab != NULL) 843 sk = kmem_cache_alloc(slab, priority); 844 else 845 sk = kmalloc(prot->obj_size, priority); 846 847 if (sk) { 848 if (zero_it) { 849 memset(sk, 0, prot->obj_size); 850 sk->sk_family = family; 851 /* 852 * See comment in struct sock definition to understand 853 * why we need sk_prot_creator -acme 854 */ 855 sk->sk_prot = sk->sk_prot_creator = prot; 856 sock_lock_init(sk); 857 } 858 859 if (security_sk_alloc(sk, family, priority)) 860 goto out_free; 861 862 if (!try_module_get(prot->owner)) 863 goto out_free; 864 } 865 return sk; 866 867out_free: 868 if (slab != NULL) 869 kmem_cache_free(slab, sk); 870 else 871 kfree(sk); 872 return NULL; 873} 874 875void sk_free(struct sock *sk) 876{ 877 struct sk_filter *filter; 878 struct module *owner = sk->sk_prot_creator->owner; 879 880 if (sk->sk_destruct) 881 sk->sk_destruct(sk); 882 883 filter = rcu_dereference(sk->sk_filter); 884 if (filter) { 885 sk_filter_release(sk, filter); 886 rcu_assign_pointer(sk->sk_filter, NULL); 887 } 888 889 sock_disable_timestamp(sk); 890 891 if (atomic_read(&sk->sk_omem_alloc)) 892 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 893 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 894 895 security_sk_free(sk); 896 if (sk->sk_prot_creator->slab != NULL) 897 kmem_cache_free(sk->sk_prot_creator->slab, sk); 898 else 899 kfree(sk); 900 module_put(owner); 901} 902 903struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 904{ 905 struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); 906 907 if (newsk != NULL) { 908 struct sk_filter *filter; 909 910 sock_copy(newsk, sk); 911 912 /* SANITY */ 913 sk_node_init(&newsk->sk_node); 914 sock_lock_init(newsk); 915 bh_lock_sock(newsk); 916 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 917 918 atomic_set(&newsk->sk_rmem_alloc, 0); 919 atomic_set(&newsk->sk_wmem_alloc, 0); 920 atomic_set(&newsk->sk_omem_alloc, 0); 921 skb_queue_head_init(&newsk->sk_receive_queue); 922 skb_queue_head_init(&newsk->sk_write_queue); 923#ifdef CONFIG_NET_DMA 924 skb_queue_head_init(&newsk->sk_async_wait_queue); 925#endif 926 927 rwlock_init(&newsk->sk_dst_lock); 928 rwlock_init(&newsk->sk_callback_lock); 929 lockdep_set_class(&newsk->sk_callback_lock, 930 af_callback_keys + newsk->sk_family); 931 932 newsk->sk_dst_cache = NULL; 933 newsk->sk_wmem_queued = 0; 934 newsk->sk_forward_alloc = 0; 935 newsk->sk_send_head = NULL; 936 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 937 938 sock_reset_flag(newsk, SOCK_DONE); 939 skb_queue_head_init(&newsk->sk_error_queue); 940 941 filter = newsk->sk_filter; 942 if (filter != NULL) 943 sk_filter_charge(newsk, filter); 944 945 if (unlikely(xfrm_sk_clone_policy(newsk))) { 946 /* It is still raw copy of parent, so invalidate 947 * destructor and make plain sk_free() */ 948 newsk->sk_destruct = NULL; 949 sk_free(newsk); 950 newsk = NULL; 951 goto out; 952 } 953 954 newsk->sk_err = 0; 955 newsk->sk_priority = 0; 956 atomic_set(&newsk->sk_refcnt, 2); 957 958 /* 959 * Increment the counter in the same struct proto as the master 960 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 961 * is the same as sk->sk_prot->socks, as this field was copied 962 * with memcpy). 963 * 964 * This _changes_ the previous behaviour, where 965 * tcp_create_openreq_child always was incrementing the 966 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 967 * to be taken into account in all callers. -acme 968 */ 969 sk_refcnt_debug_inc(newsk); 970 newsk->sk_socket = NULL; 971 newsk->sk_sleep = NULL; 972 973 if (newsk->sk_prot->sockets_allocated) 974 atomic_inc(newsk->sk_prot->sockets_allocated); 975 } 976out: 977 return newsk; 978} 979 980EXPORT_SYMBOL_GPL(sk_clone); 981 982void __init sk_init(void) 983{ 984 if (num_physpages <= 4096) { 985 sysctl_wmem_max = 32767; 986 sysctl_rmem_max = 32767; 987 sysctl_wmem_default = 32767; 988 sysctl_rmem_default = 32767; 989 } else if (num_physpages >= 131072) { 990 sysctl_wmem_max = 131071; 991 sysctl_rmem_max = 131071; 992 } 993} 994 995/* 996 * Simple resource managers for sockets. 997 */ 998 999 1000/* 1001 * Write buffer destructor automatically called from kfree_skb. 1002 */ 1003void sock_wfree(struct sk_buff *skb) 1004{ 1005 struct sock *sk = skb->sk; 1006 1007 /* In case it might be waiting for more memory. */ 1008 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1009 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1010 sk->sk_write_space(sk); 1011 sock_put(sk); 1012} 1013 1014/* 1015 * Read buffer destructor automatically called from kfree_skb. 1016 */ 1017void sock_rfree(struct sk_buff *skb) 1018{ 1019 struct sock *sk = skb->sk; 1020 1021 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1022} 1023 1024 1025int sock_i_uid(struct sock *sk) 1026{ 1027 int uid; 1028 1029 read_lock(&sk->sk_callback_lock); 1030 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1031 read_unlock(&sk->sk_callback_lock); 1032 return uid; 1033} 1034 1035unsigned long sock_i_ino(struct sock *sk) 1036{ 1037 unsigned long ino; 1038 1039 read_lock(&sk->sk_callback_lock); 1040 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1041 read_unlock(&sk->sk_callback_lock); 1042 return ino; 1043} 1044 1045/* 1046 * Allocate a skb from the socket's send buffer. 1047 */ 1048struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1049 gfp_t priority) 1050{ 1051 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1052 struct sk_buff * skb = alloc_skb(size, priority); 1053 if (skb) { 1054 skb_set_owner_w(skb, sk); 1055 return skb; 1056 } 1057 } 1058 return NULL; 1059} 1060 1061/* 1062 * Allocate a skb from the socket's receive buffer. 1063 */ 1064struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1065 gfp_t priority) 1066{ 1067 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1068 struct sk_buff *skb = alloc_skb(size, priority); 1069 if (skb) { 1070 skb_set_owner_r(skb, sk); 1071 return skb; 1072 } 1073 } 1074 return NULL; 1075} 1076 1077/* 1078 * Allocate a memory block from the socket's option memory buffer. 1079 */ 1080void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1081{ 1082 if ((unsigned)size <= sysctl_optmem_max && 1083 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1084 void *mem; 1085 /* First do the add, to avoid the race if kmalloc 1086 * might sleep. 1087 */ 1088 atomic_add(size, &sk->sk_omem_alloc); 1089 mem = kmalloc(size, priority); 1090 if (mem) 1091 return mem; 1092 atomic_sub(size, &sk->sk_omem_alloc); 1093 } 1094 return NULL; 1095} 1096 1097/* 1098 * Free an option memory block. 1099 */ 1100void sock_kfree_s(struct sock *sk, void *mem, int size) 1101{ 1102 kfree(mem); 1103 atomic_sub(size, &sk->sk_omem_alloc); 1104} 1105 1106/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1107 I think, these locks should be removed for datagram sockets. 1108 */ 1109static long sock_wait_for_wmem(struct sock * sk, long timeo) 1110{ 1111 DEFINE_WAIT(wait); 1112 1113 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1114 for (;;) { 1115 if (!timeo) 1116 break; 1117 if (signal_pending(current)) 1118 break; 1119 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1120 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1121 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1122 break; 1123 if (sk->sk_shutdown & SEND_SHUTDOWN) 1124 break; 1125 if (sk->sk_err) 1126 break; 1127 timeo = schedule_timeout(timeo); 1128 } 1129 finish_wait(sk->sk_sleep, &wait); 1130 return timeo; 1131} 1132 1133 1134/* 1135 * Generic send/receive buffer handlers 1136 */ 1137 1138static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1139 unsigned long header_len, 1140 unsigned long data_len, 1141 int noblock, int *errcode) 1142{ 1143 struct sk_buff *skb; 1144 gfp_t gfp_mask; 1145 long timeo; 1146 int err; 1147 1148 gfp_mask = sk->sk_allocation; 1149 if (gfp_mask & __GFP_WAIT) 1150 gfp_mask |= __GFP_REPEAT; 1151 1152 timeo = sock_sndtimeo(sk, noblock); 1153 while (1) { 1154 err = sock_error(sk); 1155 if (err != 0) 1156 goto failure; 1157 1158 err = -EPIPE; 1159 if (sk->sk_shutdown & SEND_SHUTDOWN) 1160 goto failure; 1161 1162 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1163 skb = alloc_skb(header_len, gfp_mask); 1164 if (skb) { 1165 int npages; 1166 int i; 1167 1168 /* No pages, we're done... */ 1169 if (!data_len) 1170 break; 1171 1172 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1173 skb->truesize += data_len; 1174 skb_shinfo(skb)->nr_frags = npages; 1175 for (i = 0; i < npages; i++) { 1176 struct page *page; 1177 skb_frag_t *frag; 1178 1179 page = alloc_pages(sk->sk_allocation, 0); 1180 if (!page) { 1181 err = -ENOBUFS; 1182 skb_shinfo(skb)->nr_frags = i; 1183 kfree_skb(skb); 1184 goto failure; 1185 } 1186 1187 frag = &skb_shinfo(skb)->frags[i]; 1188 frag->page = page; 1189 frag->page_offset = 0; 1190 frag->size = (data_len >= PAGE_SIZE ? 1191 PAGE_SIZE : 1192 data_len); 1193 data_len -= PAGE_SIZE; 1194 } 1195 1196 /* Full success... */ 1197 break; 1198 } 1199 err = -ENOBUFS; 1200 goto failure; 1201 } 1202 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1203 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1204 err = -EAGAIN; 1205 if (!timeo) 1206 goto failure; 1207 if (signal_pending(current)) 1208 goto interrupted; 1209 timeo = sock_wait_for_wmem(sk, timeo); 1210 } 1211 1212 skb_set_owner_w(skb, sk); 1213 return skb; 1214 1215interrupted: 1216 err = sock_intr_errno(timeo); 1217failure: 1218 *errcode = err; 1219 return NULL; 1220} 1221 1222struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1223 int noblock, int *errcode) 1224{ 1225 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1226} 1227 1228static void __lock_sock(struct sock *sk) 1229{ 1230 DEFINE_WAIT(wait); 1231 1232 for (;;) { 1233 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1234 TASK_UNINTERRUPTIBLE); 1235 spin_unlock_bh(&sk->sk_lock.slock); 1236 schedule(); 1237 spin_lock_bh(&sk->sk_lock.slock); 1238 if (!sock_owned_by_user(sk)) 1239 break; 1240 } 1241 finish_wait(&sk->sk_lock.wq, &wait); 1242} 1243 1244static void __release_sock(struct sock *sk) 1245{ 1246 struct sk_buff *skb = sk->sk_backlog.head; 1247 1248 do { 1249 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1250 bh_unlock_sock(sk); 1251 1252 do { 1253 struct sk_buff *next = skb->next; 1254 1255 skb->next = NULL; 1256 sk->sk_backlog_rcv(sk, skb); 1257 1258 /* 1259 * We are in process context here with softirqs 1260 * disabled, use cond_resched_softirq() to preempt. 1261 * This is safe to do because we've taken the backlog 1262 * queue private: 1263 */ 1264 cond_resched_softirq(); 1265 1266 skb = next; 1267 } while (skb != NULL); 1268 1269 bh_lock_sock(sk); 1270 } while ((skb = sk->sk_backlog.head) != NULL); 1271} 1272 1273/** 1274 * sk_wait_data - wait for data to arrive at sk_receive_queue 1275 * @sk: sock to wait on 1276 * @timeo: for how long 1277 * 1278 * Now socket state including sk->sk_err is changed only under lock, 1279 * hence we may omit checks after joining wait queue. 1280 * We check receive queue before schedule() only as optimization; 1281 * it is very likely that release_sock() added new data. 1282 */ 1283int sk_wait_data(struct sock *sk, long *timeo) 1284{ 1285 int rc; 1286 DEFINE_WAIT(wait); 1287 1288 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1289 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1290 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1291 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1292 finish_wait(sk->sk_sleep, &wait); 1293 return rc; 1294} 1295 1296EXPORT_SYMBOL(sk_wait_data); 1297 1298/* 1299 * Set of default routines for initialising struct proto_ops when 1300 * the protocol does not support a particular function. In certain 1301 * cases where it makes no sense for a protocol to have a "do nothing" 1302 * function, some default processing is provided. 1303 */ 1304 1305int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1306{ 1307 return -EOPNOTSUPP; 1308} 1309 1310int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1311 int len, int flags) 1312{ 1313 return -EOPNOTSUPP; 1314} 1315 1316int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1317{ 1318 return -EOPNOTSUPP; 1319} 1320 1321int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1322{ 1323 return -EOPNOTSUPP; 1324} 1325 1326int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1327 int *len, int peer) 1328{ 1329 return -EOPNOTSUPP; 1330} 1331 1332unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1333{ 1334 return 0; 1335} 1336 1337int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1338{ 1339 return -EOPNOTSUPP; 1340} 1341 1342int sock_no_listen(struct socket *sock, int backlog) 1343{ 1344 return -EOPNOTSUPP; 1345} 1346 1347int sock_no_shutdown(struct socket *sock, int how) 1348{ 1349 return -EOPNOTSUPP; 1350} 1351 1352int sock_no_setsockopt(struct socket *sock, int level, int optname, 1353 char __user *optval, int optlen) 1354{ 1355 return -EOPNOTSUPP; 1356} 1357 1358int sock_no_getsockopt(struct socket *sock, int level, int optname, 1359 char __user *optval, int __user *optlen) 1360{ 1361 return -EOPNOTSUPP; 1362} 1363 1364int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1365 size_t len) 1366{ 1367 return -EOPNOTSUPP; 1368} 1369 1370int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1371 size_t len, int flags) 1372{ 1373 return -EOPNOTSUPP; 1374} 1375 1376int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1377{ 1378 /* Mirror missing mmap method error code */ 1379 return -ENODEV; 1380} 1381 1382ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1383{ 1384 ssize_t res; 1385 struct msghdr msg = {.msg_flags = flags}; 1386 struct kvec iov; 1387 char *kaddr = kmap(page); 1388 iov.iov_base = kaddr + offset; 1389 iov.iov_len = size; 1390 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1391 kunmap(page); 1392 return res; 1393} 1394 1395/* 1396 * Default Socket Callbacks 1397 */ 1398 1399static void sock_def_wakeup(struct sock *sk) 1400{ 1401 read_lock(&sk->sk_callback_lock); 1402 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1403 wake_up_interruptible_all(sk->sk_sleep); 1404 read_unlock(&sk->sk_callback_lock); 1405} 1406 1407static void sock_def_error_report(struct sock *sk) 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,0,POLL_ERR); 1413 read_unlock(&sk->sk_callback_lock); 1414} 1415 1416static void sock_def_readable(struct sock *sk, int len) 1417{ 1418 read_lock(&sk->sk_callback_lock); 1419 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1420 wake_up_interruptible(sk->sk_sleep); 1421 sk_wake_async(sk,1,POLL_IN); 1422 read_unlock(&sk->sk_callback_lock); 1423} 1424 1425static void sock_def_write_space(struct sock *sk) 1426{ 1427 read_lock(&sk->sk_callback_lock); 1428 1429 /* Do not wake up a writer until he can make "significant" 1430 * progress. --DaveM 1431 */ 1432 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1433 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1434 wake_up_interruptible(sk->sk_sleep); 1435 1436 /* Should agree with poll, otherwise some programs break */ 1437 if (sock_writeable(sk)) 1438 sk_wake_async(sk, 2, POLL_OUT); 1439 } 1440 1441 read_unlock(&sk->sk_callback_lock); 1442} 1443 1444static void sock_def_destruct(struct sock *sk) 1445{ 1446 kfree(sk->sk_protinfo); 1447} 1448 1449void sk_send_sigurg(struct sock *sk) 1450{ 1451 if (sk->sk_socket && sk->sk_socket->file) 1452 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1453 sk_wake_async(sk, 3, POLL_PRI); 1454} 1455 1456void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1457 unsigned long expires) 1458{ 1459 if (!mod_timer(timer, expires)) 1460 sock_hold(sk); 1461} 1462 1463EXPORT_SYMBOL(sk_reset_timer); 1464 1465void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1466{ 1467 if (timer_pending(timer) && del_timer(timer)) 1468 __sock_put(sk); 1469} 1470 1471EXPORT_SYMBOL(sk_stop_timer); 1472 1473void sock_init_data(struct socket *sock, struct sock *sk) 1474{ 1475 skb_queue_head_init(&sk->sk_receive_queue); 1476 skb_queue_head_init(&sk->sk_write_queue); 1477 skb_queue_head_init(&sk->sk_error_queue); 1478#ifdef CONFIG_NET_DMA 1479 skb_queue_head_init(&sk->sk_async_wait_queue); 1480#endif 1481 1482 sk->sk_send_head = NULL; 1483 1484 init_timer(&sk->sk_timer); 1485 1486 sk->sk_allocation = GFP_KERNEL; 1487 sk->sk_rcvbuf = sysctl_rmem_default; 1488 sk->sk_sndbuf = sysctl_wmem_default; 1489 sk->sk_state = TCP_CLOSE; 1490 sk->sk_socket = sock; 1491 1492 sock_set_flag(sk, SOCK_ZAPPED); 1493 1494 if (sock) { 1495 sk->sk_type = sock->type; 1496 sk->sk_sleep = &sock->wait; 1497 sock->sk = sk; 1498 } else 1499 sk->sk_sleep = NULL; 1500 1501 rwlock_init(&sk->sk_dst_lock); 1502 rwlock_init(&sk->sk_callback_lock); 1503 lockdep_set_class(&sk->sk_callback_lock, 1504 af_callback_keys + sk->sk_family); 1505 1506 sk->sk_state_change = sock_def_wakeup; 1507 sk->sk_data_ready = sock_def_readable; 1508 sk->sk_write_space = sock_def_write_space; 1509 sk->sk_error_report = sock_def_error_report; 1510 sk->sk_destruct = sock_def_destruct; 1511 1512 sk->sk_sndmsg_page = NULL; 1513 sk->sk_sndmsg_off = 0; 1514 1515 sk->sk_peercred.pid = 0; 1516 sk->sk_peercred.uid = -1; 1517 sk->sk_peercred.gid = -1; 1518 sk->sk_write_pending = 0; 1519 sk->sk_rcvlowat = 1; 1520 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1521 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1522 1523 sk->sk_stamp = ktime_set(-1L, -1L); 1524 1525 atomic_set(&sk->sk_refcnt, 1); 1526} 1527 1528void fastcall lock_sock_nested(struct sock *sk, int subclass) 1529{ 1530 might_sleep(); 1531 spin_lock_bh(&sk->sk_lock.slock); 1532 if (sk->sk_lock.owner) 1533 __lock_sock(sk); 1534 sk->sk_lock.owner = (void *)1; 1535 spin_unlock(&sk->sk_lock.slock); 1536 /* 1537 * The sk_lock has mutex_lock() semantics here: 1538 */ 1539 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1540 local_bh_enable(); 1541} 1542 1543EXPORT_SYMBOL(lock_sock_nested); 1544 1545void fastcall release_sock(struct sock *sk) 1546{ 1547 /* 1548 * The sk_lock has mutex_unlock() semantics: 1549 */ 1550 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1551 1552 spin_lock_bh(&sk->sk_lock.slock); 1553 if (sk->sk_backlog.tail) 1554 __release_sock(sk); 1555 sk->sk_lock.owner = NULL; 1556 if (waitqueue_active(&sk->sk_lock.wq)) 1557 wake_up(&sk->sk_lock.wq); 1558 spin_unlock_bh(&sk->sk_lock.slock); 1559} 1560EXPORT_SYMBOL(release_sock); 1561 1562int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1563{ 1564 struct timeval tv; 1565 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1566 sock_enable_timestamp(sk); 1567 tv = ktime_to_timeval(sk->sk_stamp); 1568 if (tv.tv_sec == -1) 1569 return -ENOENT; 1570 if (tv.tv_sec == 0) { 1571 sk->sk_stamp = ktime_get_real(); 1572 tv = ktime_to_timeval(sk->sk_stamp); 1573 } 1574 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1575} 1576EXPORT_SYMBOL(sock_get_timestamp); 1577 1578int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1579{ 1580 struct timespec ts; 1581 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1582 sock_enable_timestamp(sk); 1583 ts = ktime_to_timespec(sk->sk_stamp); 1584 if (ts.tv_sec == -1) 1585 return -ENOENT; 1586 if (ts.tv_sec == 0) { 1587 sk->sk_stamp = ktime_get_real(); 1588 ts = ktime_to_timespec(sk->sk_stamp); 1589 } 1590 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1591} 1592EXPORT_SYMBOL(sock_get_timestampns); 1593 1594void sock_enable_timestamp(struct sock *sk) 1595{ 1596 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1597 sock_set_flag(sk, SOCK_TIMESTAMP); 1598 net_enable_timestamp(); 1599 } 1600} 1601EXPORT_SYMBOL(sock_enable_timestamp); 1602 1603/* 1604 * Get a socket option on an socket. 1605 * 1606 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1607 * asynchronous errors should be reported by getsockopt. We assume 1608 * this means if you specify SO_ERROR (otherwise whats the point of it). 1609 */ 1610int sock_common_getsockopt(struct socket *sock, int level, int optname, 1611 char __user *optval, int __user *optlen) 1612{ 1613 struct sock *sk = sock->sk; 1614 1615 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1616} 1617 1618EXPORT_SYMBOL(sock_common_getsockopt); 1619 1620#ifdef CONFIG_COMPAT 1621int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1622 char __user *optval, int __user *optlen) 1623{ 1624 struct sock *sk = sock->sk; 1625 1626 if (sk->sk_prot->compat_getsockopt != NULL) 1627 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1628 optval, optlen); 1629 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1630} 1631EXPORT_SYMBOL(compat_sock_common_getsockopt); 1632#endif 1633 1634int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1635 struct msghdr *msg, size_t size, int flags) 1636{ 1637 struct sock *sk = sock->sk; 1638 int addr_len = 0; 1639 int err; 1640 1641 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1642 flags & ~MSG_DONTWAIT, &addr_len); 1643 if (err >= 0) 1644 msg->msg_namelen = addr_len; 1645 return err; 1646} 1647 1648EXPORT_SYMBOL(sock_common_recvmsg); 1649 1650/* 1651 * Set socket options on an inet socket. 1652 */ 1653int sock_common_setsockopt(struct socket *sock, int level, int optname, 1654 char __user *optval, int optlen) 1655{ 1656 struct sock *sk = sock->sk; 1657 1658 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1659} 1660 1661EXPORT_SYMBOL(sock_common_setsockopt); 1662 1663#ifdef CONFIG_COMPAT 1664int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1665 char __user *optval, int optlen) 1666{ 1667 struct sock *sk = sock->sk; 1668 1669 if (sk->sk_prot->compat_setsockopt != NULL) 1670 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1671 optval, optlen); 1672 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1673} 1674EXPORT_SYMBOL(compat_sock_common_setsockopt); 1675#endif 1676 1677void sk_common_release(struct sock *sk) 1678{ 1679 if (sk->sk_prot->destroy) 1680 sk->sk_prot->destroy(sk); 1681 1682 /* 1683 * Observation: when sock_common_release is called, processes have 1684 * no access to socket. But net still has. 1685 * Step one, detach it from networking: 1686 * 1687 * A. Remove from hash tables. 1688 */ 1689 1690 sk->sk_prot->unhash(sk); 1691 1692 /* 1693 * In this point socket cannot receive new packets, but it is possible 1694 * that some packets are in flight because some CPU runs receiver and 1695 * did hash table lookup before we unhashed socket. They will achieve 1696 * receive queue and will be purged by socket destructor. 1697 * 1698 * Also we still have packets pending on receive queue and probably, 1699 * our own packets waiting in device queues. sock_destroy will drain 1700 * receive queue, but transmitted packets will delay socket destruction 1701 * until the last reference will be released. 1702 */ 1703 1704 sock_orphan(sk); 1705 1706 xfrm_sk_free_policy(sk); 1707 1708 sk_refcnt_debug_release(sk); 1709 sock_put(sk); 1710} 1711 1712EXPORT_SYMBOL(sk_common_release); 1713 1714static DEFINE_RWLOCK(proto_list_lock); 1715static LIST_HEAD(proto_list); 1716 1717int proto_register(struct proto *prot, int alloc_slab) 1718{ 1719 char *request_sock_slab_name = NULL; 1720 char *timewait_sock_slab_name; 1721 int rc = -ENOBUFS; 1722 1723 if (alloc_slab) { 1724 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1725 SLAB_HWCACHE_ALIGN, NULL, NULL); 1726 1727 if (prot->slab == NULL) { 1728 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1729 prot->name); 1730 goto out; 1731 } 1732 1733 if (prot->rsk_prot != NULL) { 1734 static const char mask[] = "request_sock_%s"; 1735 1736 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1737 if (request_sock_slab_name == NULL) 1738 goto out_free_sock_slab; 1739 1740 sprintf(request_sock_slab_name, mask, prot->name); 1741 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1742 prot->rsk_prot->obj_size, 0, 1743 SLAB_HWCACHE_ALIGN, NULL, NULL); 1744 1745 if (prot->rsk_prot->slab == NULL) { 1746 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1747 prot->name); 1748 goto out_free_request_sock_slab_name; 1749 } 1750 } 1751 1752 if (prot->twsk_prot != NULL) { 1753 static const char mask[] = "tw_sock_%s"; 1754 1755 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1756 1757 if (timewait_sock_slab_name == NULL) 1758 goto out_free_request_sock_slab; 1759 1760 sprintf(timewait_sock_slab_name, mask, prot->name); 1761 prot->twsk_prot->twsk_slab = 1762 kmem_cache_create(timewait_sock_slab_name, 1763 prot->twsk_prot->twsk_obj_size, 1764 0, SLAB_HWCACHE_ALIGN, 1765 NULL, NULL); 1766 if (prot->twsk_prot->twsk_slab == NULL) 1767 goto out_free_timewait_sock_slab_name; 1768 } 1769 } 1770 1771 write_lock(&proto_list_lock); 1772 list_add(&prot->node, &proto_list); 1773 write_unlock(&proto_list_lock); 1774 rc = 0; 1775out: 1776 return rc; 1777out_free_timewait_sock_slab_name: 1778 kfree(timewait_sock_slab_name); 1779out_free_request_sock_slab: 1780 if (prot->rsk_prot && prot->rsk_prot->slab) { 1781 kmem_cache_destroy(prot->rsk_prot->slab); 1782 prot->rsk_prot->slab = NULL; 1783 } 1784out_free_request_sock_slab_name: 1785 kfree(request_sock_slab_name); 1786out_free_sock_slab: 1787 kmem_cache_destroy(prot->slab); 1788 prot->slab = NULL; 1789 goto out; 1790} 1791 1792EXPORT_SYMBOL(proto_register); 1793 1794void proto_unregister(struct proto *prot) 1795{ 1796 write_lock(&proto_list_lock); 1797 list_del(&prot->node); 1798 write_unlock(&proto_list_lock); 1799 1800 if (prot->slab != NULL) { 1801 kmem_cache_destroy(prot->slab); 1802 prot->slab = NULL; 1803 } 1804 1805 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1806 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1807 1808 kmem_cache_destroy(prot->rsk_prot->slab); 1809 kfree(name); 1810 prot->rsk_prot->slab = NULL; 1811 } 1812 1813 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1814 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1815 1816 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1817 kfree(name); 1818 prot->twsk_prot->twsk_slab = NULL; 1819 } 1820} 1821 1822EXPORT_SYMBOL(proto_unregister); 1823 1824#ifdef CONFIG_PROC_FS 1825static inline struct proto *__proto_head(void) 1826{ 1827 return list_entry(proto_list.next, struct proto, node); 1828} 1829 1830static inline struct proto *proto_head(void) 1831{ 1832 return list_empty(&proto_list) ? NULL : __proto_head(); 1833} 1834 1835static inline struct proto *proto_next(struct proto *proto) 1836{ 1837 return proto->node.next == &proto_list ? NULL : 1838 list_entry(proto->node.next, struct proto, node); 1839} 1840 1841static inline struct proto *proto_get_idx(loff_t pos) 1842{ 1843 struct proto *proto; 1844 loff_t i = 0; 1845 1846 list_for_each_entry(proto, &proto_list, node) 1847 if (i++ == pos) 1848 goto out; 1849 1850 proto = NULL; 1851out: 1852 return proto; 1853} 1854 1855static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1856{ 1857 read_lock(&proto_list_lock); 1858 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; 1859} 1860 1861static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1862{ 1863 ++*pos; 1864 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); 1865} 1866 1867static void proto_seq_stop(struct seq_file *seq, void *v) 1868{ 1869 read_unlock(&proto_list_lock); 1870} 1871 1872static char proto_method_implemented(const void *method) 1873{ 1874 return method == NULL ? 'n' : 'y'; 1875} 1876 1877static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1878{ 1879 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1880 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1881 proto->name, 1882 proto->obj_size, 1883 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1884 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1885 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1886 proto->max_header, 1887 proto->slab == NULL ? "no" : "yes", 1888 module_name(proto->owner), 1889 proto_method_implemented(proto->close), 1890 proto_method_implemented(proto->connect), 1891 proto_method_implemented(proto->disconnect), 1892 proto_method_implemented(proto->accept), 1893 proto_method_implemented(proto->ioctl), 1894 proto_method_implemented(proto->init), 1895 proto_method_implemented(proto->destroy), 1896 proto_method_implemented(proto->shutdown), 1897 proto_method_implemented(proto->setsockopt), 1898 proto_method_implemented(proto->getsockopt), 1899 proto_method_implemented(proto->sendmsg), 1900 proto_method_implemented(proto->recvmsg), 1901 proto_method_implemented(proto->sendpage), 1902 proto_method_implemented(proto->bind), 1903 proto_method_implemented(proto->backlog_rcv), 1904 proto_method_implemented(proto->hash), 1905 proto_method_implemented(proto->unhash), 1906 proto_method_implemented(proto->get_port), 1907 proto_method_implemented(proto->enter_memory_pressure)); 1908} 1909 1910static int proto_seq_show(struct seq_file *seq, void *v) 1911{ 1912 if (v == SEQ_START_TOKEN) 1913 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1914 "protocol", 1915 "size", 1916 "sockets", 1917 "memory", 1918 "press", 1919 "maxhdr", 1920 "slab", 1921 "module", 1922 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1923 else 1924 proto_seq_printf(seq, v); 1925 return 0; 1926} 1927 1928static const struct seq_operations proto_seq_ops = { 1929 .start = proto_seq_start, 1930 .next = proto_seq_next, 1931 .stop = proto_seq_stop, 1932 .show = proto_seq_show, 1933}; 1934 1935static int proto_seq_open(struct inode *inode, struct file *file) 1936{ 1937 return seq_open(file, &proto_seq_ops); 1938} 1939 1940static const struct file_operations proto_seq_fops = { 1941 .owner = THIS_MODULE, 1942 .open = proto_seq_open, 1943 .read = seq_read, 1944 .llseek = seq_lseek, 1945 .release = seq_release, 1946}; 1947 1948static int __init proto_init(void) 1949{ 1950 /* register /proc/net/protocols */ 1951 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1952} 1953 1954subsys_initcall(proto_init); 1955 1956#endif /* PROC_FS */ 1957 1958EXPORT_SYMBOL(sk_alloc); 1959EXPORT_SYMBOL(sk_free); 1960EXPORT_SYMBOL(sk_send_sigurg); 1961EXPORT_SYMBOL(sock_alloc_send_skb); 1962EXPORT_SYMBOL(sock_init_data); 1963EXPORT_SYMBOL(sock_kfree_s); 1964EXPORT_SYMBOL(sock_kmalloc); 1965EXPORT_SYMBOL(sock_no_accept); 1966EXPORT_SYMBOL(sock_no_bind); 1967EXPORT_SYMBOL(sock_no_connect); 1968EXPORT_SYMBOL(sock_no_getname); 1969EXPORT_SYMBOL(sock_no_getsockopt); 1970EXPORT_SYMBOL(sock_no_ioctl); 1971EXPORT_SYMBOL(sock_no_listen); 1972EXPORT_SYMBOL(sock_no_mmap); 1973EXPORT_SYMBOL(sock_no_poll); 1974EXPORT_SYMBOL(sock_no_recvmsg); 1975EXPORT_SYMBOL(sock_no_sendmsg); 1976EXPORT_SYMBOL(sock_no_sendpage); 1977EXPORT_SYMBOL(sock_no_setsockopt); 1978EXPORT_SYMBOL(sock_no_shutdown); 1979EXPORT_SYMBOL(sock_no_socketpair); 1980EXPORT_SYMBOL(sock_rfree); 1981EXPORT_SYMBOL(sock_setsockopt); 1982EXPORT_SYMBOL(sock_wfree); 1983EXPORT_SYMBOL(sock_wmalloc); 1984EXPORT_SYMBOL(sock_i_uid); 1985EXPORT_SYMBOL(sock_i_ino); 1986EXPORT_SYMBOL(sysctl_optmem_max); 1987#ifdef CONFIG_SYSCTL 1988EXPORT_SYMBOL(sysctl_rmem_max); 1989EXPORT_SYMBOL(sysctl_wmem_max); 1990#endif 1991