sock.c revision c0ef877b2c9f543e9fb7953bfe1a0cd3a4eae362
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Generic socket support routines. Memory allocators, socket lock/release 7 * handler for protocols to use and generic option handler. 8 * 9 * 10 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $ 11 * 12 * Authors: Ross Biro 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 14 * Florian La Roche, <flla@stud.uni-sb.de> 15 * Alan Cox, <A.Cox@swansea.ac.uk> 16 * 17 * Fixes: 18 * Alan Cox : Numerous verify_area() problems 19 * Alan Cox : Connecting on a connecting socket 20 * now returns an error for tcp. 21 * Alan Cox : sock->protocol is set correctly. 22 * and is not sometimes left as 0. 23 * Alan Cox : connect handles icmp errors on a 24 * connect properly. Unfortunately there 25 * is a restart syscall nasty there. I 26 * can't match BSD without hacking the C 27 * library. Ideas urgently sought! 28 * Alan Cox : Disallow bind() to addresses that are 29 * not ours - especially broadcast ones!! 30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 32 * instead they leave that for the DESTROY timer. 33 * Alan Cox : Clean up error flag in accept 34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 35 * was buggy. Put a remove_sock() in the handler 36 * for memory when we hit 0. Also altered the timer 37 * code. The ACK stuff can wait and needs major 38 * TCP layer surgery. 39 * Alan Cox : Fixed TCP ack bug, removed remove sock 40 * and fixed timer/inet_bh race. 41 * Alan Cox : Added zapped flag for TCP 42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 47 * Rick Sladkey : Relaxed UDP rules for matching packets. 48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 49 * Pauline Middelink : identd support 50 * Alan Cox : Fixed connect() taking signals I think. 51 * Alan Cox : SO_LINGER supported 52 * Alan Cox : Error reporting fixes 53 * Anonymous : inet_create tidied up (sk->reuse setting) 54 * Alan Cox : inet sockets don't set sk->type! 55 * Alan Cox : Split socket option code 56 * Alan Cox : Callbacks 57 * Alan Cox : Nagle flag for Charles & Johannes stuff 58 * Alex : Removed restriction on inet fioctl 59 * Alan Cox : Splitting INET from NET core 60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 62 * Alan Cox : Split IP from generic code 63 * Alan Cox : New kfree_skbmem() 64 * Alan Cox : Make SO_DEBUG superuser only. 65 * Alan Cox : Allow anyone to clear SO_DEBUG 66 * (compatibility fix) 67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 68 * Alan Cox : Allocator for a socket is settable. 69 * Alan Cox : SO_ERROR includes soft errors. 70 * Alan Cox : Allow NULL arguments on some SO_ opts 71 * Alan Cox : Generic socket allocation to make hooks 72 * easier (suggested by Craig Metz). 73 * Michael Pall : SO_ERROR returns positive errno again 74 * Steve Whitehouse: Added default destructor to free 75 * protocol private data. 76 * Steve Whitehouse: Added various other default routines 77 * common to several socket families. 78 * Chris Evans : Call suser() check last on F_SETOWN 79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 81 * Andi Kleen : Fix write_space callback 82 * Chris Evans : Security fixes - signedness again 83 * Arnaldo C. Melo : cleanups, use skb_queue_purge 84 * 85 * To Fix: 86 * 87 * 88 * This program is free software; you can redistribute it and/or 89 * modify it under the terms of the GNU General Public License 90 * as published by the Free Software Foundation; either version 91 * 2 of the License, or (at your option) any later version. 92 */ 93 94#include <linux/capability.h> 95#include <linux/errno.h> 96#include <linux/types.h> 97#include <linux/socket.h> 98#include <linux/in.h> 99#include <linux/kernel.h> 100#include <linux/module.h> 101#include <linux/proc_fs.h> 102#include <linux/seq_file.h> 103#include <linux/sched.h> 104#include <linux/timer.h> 105#include <linux/string.h> 106#include <linux/sockios.h> 107#include <linux/net.h> 108#include <linux/mm.h> 109#include <linux/slab.h> 110#include <linux/interrupt.h> 111#include <linux/poll.h> 112#include <linux/tcp.h> 113#include <linux/init.h> 114#include <linux/highmem.h> 115 116#include <asm/uaccess.h> 117#include <asm/system.h> 118 119#include <linux/netdevice.h> 120#include <net/protocol.h> 121#include <linux/skbuff.h> 122#include <net/net_namespace.h> 123#include <net/request_sock.h> 124#include <net/sock.h> 125#include <net/xfrm.h> 126#include <linux/ipsec.h> 127 128#include <linux/filter.h> 129 130#ifdef CONFIG_INET 131#include <net/tcp.h> 132#endif 133 134/* 135 * Each address family might have different locking rules, so we have 136 * one slock key per address family: 137 */ 138static struct lock_class_key af_family_keys[AF_MAX]; 139static struct lock_class_key af_family_slock_keys[AF_MAX]; 140 141#ifdef CONFIG_DEBUG_LOCK_ALLOC 142/* 143 * Make lock validator output more readable. (we pre-construct these 144 * strings build-time, so that runtime initialization of socket 145 * locks is fast): 146 */ 147static const char *af_family_key_strings[AF_MAX+1] = { 148 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 149 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 150 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 151 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 152 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 153 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 154 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 155 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 156 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 157 "sk_lock-27" , "sk_lock-28" , "sk_lock-29" , 158 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 159 "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX" 160}; 161static const char *af_family_slock_key_strings[AF_MAX+1] = { 162 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 163 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 164 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 165 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 166 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 167 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 168 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 169 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 170 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 171 "slock-27" , "slock-28" , "slock-29" , 172 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 173 "slock-AF_RXRPC" , "slock-AF_MAX" 174}; 175static const char *af_family_clock_key_strings[AF_MAX+1] = { 176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , 184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 185 "clock-27" , "clock-28" , "clock-29" , 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 187 "clock-AF_RXRPC" , "clock-AF_MAX" 188}; 189#endif 190 191/* 192 * sk_callback_lock locking rules are per-address-family, 193 * so split the lock classes by using a per-AF key: 194 */ 195static struct lock_class_key af_callback_keys[AF_MAX]; 196 197/* Take into consideration the size of the struct sk_buff overhead in the 198 * determination of these values, since that is non-constant across 199 * platforms. This makes socket queueing behavior and performance 200 * not depend upon such differences. 201 */ 202#define _SK_MEM_PACKETS 256 203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 206 207/* Run time adjustable parameters. */ 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 212 213/* Maximal space eaten by iovec or ancilliary data plus some space */ 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 215 216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 217{ 218 struct timeval tv; 219 220 if (optlen < sizeof(tv)) 221 return -EINVAL; 222 if (copy_from_user(&tv, optval, sizeof(tv))) 223 return -EFAULT; 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 225 return -EDOM; 226 227 if (tv.tv_sec < 0) { 228 static int warned __read_mostly; 229 230 *timeo_p = 0; 231 if (warned < 10 && net_ratelimit()) 232 warned++; 233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 234 "tries to set negative timeout\n", 235 current->comm, task_pid_nr(current)); 236 return 0; 237 } 238 *timeo_p = MAX_SCHEDULE_TIMEOUT; 239 if (tv.tv_sec == 0 && tv.tv_usec == 0) 240 return 0; 241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 243 return 0; 244} 245 246static void sock_warn_obsolete_bsdism(const char *name) 247{ 248 static int warned; 249 static char warncomm[TASK_COMM_LEN]; 250 if (strcmp(warncomm, current->comm) && warned < 5) { 251 strcpy(warncomm, current->comm); 252 printk(KERN_WARNING "process `%s' is using obsolete " 253 "%s SO_BSDCOMPAT\n", warncomm, name); 254 warned++; 255 } 256} 257 258static void sock_disable_timestamp(struct sock *sk) 259{ 260 if (sock_flag(sk, SOCK_TIMESTAMP)) { 261 sock_reset_flag(sk, SOCK_TIMESTAMP); 262 net_disable_timestamp(); 263 } 264} 265 266 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 268{ 269 int err = 0; 270 int skb_len; 271 272 /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces 273 number of warnings when compiling with -W --ANK 274 */ 275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 276 (unsigned)sk->sk_rcvbuf) { 277 err = -ENOMEM; 278 goto out; 279 } 280 281 err = sk_filter(sk, skb); 282 if (err) 283 goto out; 284 285 skb->dev = NULL; 286 skb_set_owner_r(skb, sk); 287 288 /* Cache the SKB length before we tack it onto the receive 289 * queue. Once it is added it no longer belongs to us and 290 * may be freed by other threads of control pulling packets 291 * from the queue. 292 */ 293 skb_len = skb->len; 294 295 skb_queue_tail(&sk->sk_receive_queue, skb); 296 297 if (!sock_flag(sk, SOCK_DEAD)) 298 sk->sk_data_ready(sk, skb_len); 299out: 300 return err; 301} 302EXPORT_SYMBOL(sock_queue_rcv_skb); 303 304int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 305{ 306 int rc = NET_RX_SUCCESS; 307 308 if (sk_filter(sk, skb)) 309 goto discard_and_relse; 310 311 skb->dev = NULL; 312 313 if (nested) 314 bh_lock_sock_nested(sk); 315 else 316 bh_lock_sock(sk); 317 if (!sock_owned_by_user(sk)) { 318 /* 319 * trylock + unlock semantics: 320 */ 321 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 322 323 rc = sk->sk_backlog_rcv(sk, skb); 324 325 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 326 } else 327 sk_add_backlog(sk, skb); 328 bh_unlock_sock(sk); 329out: 330 sock_put(sk); 331 return rc; 332discard_and_relse: 333 kfree_skb(skb); 334 goto out; 335} 336EXPORT_SYMBOL(sk_receive_skb); 337 338struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 339{ 340 struct dst_entry *dst = sk->sk_dst_cache; 341 342 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 343 sk->sk_dst_cache = NULL; 344 dst_release(dst); 345 return NULL; 346 } 347 348 return dst; 349} 350EXPORT_SYMBOL(__sk_dst_check); 351 352struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 353{ 354 struct dst_entry *dst = sk_dst_get(sk); 355 356 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 357 sk_dst_reset(sk); 358 dst_release(dst); 359 return NULL; 360 } 361 362 return dst; 363} 364EXPORT_SYMBOL(sk_dst_check); 365 366static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 367{ 368 int ret = -ENOPROTOOPT; 369#ifdef CONFIG_NETDEVICES 370 struct net *net = sk->sk_net; 371 char devname[IFNAMSIZ]; 372 int index; 373 374 /* Sorry... */ 375 ret = -EPERM; 376 if (!capable(CAP_NET_RAW)) 377 goto out; 378 379 ret = -EINVAL; 380 if (optlen < 0) 381 goto out; 382 383 /* Bind this socket to a particular device like "eth0", 384 * as specified in the passed interface name. If the 385 * name is "" or the option length is zero the socket 386 * is not bound. 387 */ 388 if (optlen > IFNAMSIZ - 1) 389 optlen = IFNAMSIZ - 1; 390 memset(devname, 0, sizeof(devname)); 391 392 ret = -EFAULT; 393 if (copy_from_user(devname, optval, optlen)) 394 goto out; 395 396 if (devname[0] == '\0') { 397 index = 0; 398 } else { 399 struct net_device *dev = dev_get_by_name(net, devname); 400 401 ret = -ENODEV; 402 if (!dev) 403 goto out; 404 405 index = dev->ifindex; 406 dev_put(dev); 407 } 408 409 lock_sock(sk); 410 sk->sk_bound_dev_if = index; 411 sk_dst_reset(sk); 412 release_sock(sk); 413 414 ret = 0; 415 416out: 417#endif 418 419 return ret; 420} 421 422static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 423{ 424 if (valbool) 425 sock_set_flag(sk, bit); 426 else 427 sock_reset_flag(sk, bit); 428} 429 430/* 431 * This is meant for all protocols to use and covers goings on 432 * at the socket level. Everything here is generic. 433 */ 434 435int sock_setsockopt(struct socket *sock, int level, int optname, 436 char __user *optval, int optlen) 437{ 438 struct sock *sk=sock->sk; 439 int val; 440 int valbool; 441 struct linger ling; 442 int ret = 0; 443 444 /* 445 * Options without arguments 446 */ 447 448#ifdef SO_DONTLINGER /* Compatibility item... */ 449 if (optname == SO_DONTLINGER) { 450 lock_sock(sk); 451 sock_reset_flag(sk, SOCK_LINGER); 452 release_sock(sk); 453 return 0; 454 } 455#endif 456 457 if (optname == SO_BINDTODEVICE) 458 return sock_bindtodevice(sk, optval, optlen); 459 460 if (optlen < sizeof(int)) 461 return -EINVAL; 462 463 if (get_user(val, (int __user *)optval)) 464 return -EFAULT; 465 466 valbool = val?1:0; 467 468 lock_sock(sk); 469 470 switch(optname) { 471 case SO_DEBUG: 472 if (val && !capable(CAP_NET_ADMIN)) { 473 ret = -EACCES; 474 } else 475 sock_valbool_flag(sk, SOCK_DBG, valbool); 476 break; 477 case SO_REUSEADDR: 478 sk->sk_reuse = valbool; 479 break; 480 case SO_TYPE: 481 case SO_ERROR: 482 ret = -ENOPROTOOPT; 483 break; 484 case SO_DONTROUTE: 485 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 486 break; 487 case SO_BROADCAST: 488 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 489 break; 490 case SO_SNDBUF: 491 /* Don't error on this BSD doesn't and if you think 492 about it this is right. Otherwise apps have to 493 play 'guess the biggest size' games. RCVBUF/SNDBUF 494 are treated in BSD as hints */ 495 496 if (val > sysctl_wmem_max) 497 val = sysctl_wmem_max; 498set_sndbuf: 499 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 500 if ((val * 2) < SOCK_MIN_SNDBUF) 501 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 502 else 503 sk->sk_sndbuf = val * 2; 504 505 /* 506 * Wake up sending tasks if we 507 * upped the value. 508 */ 509 sk->sk_write_space(sk); 510 break; 511 512 case SO_SNDBUFFORCE: 513 if (!capable(CAP_NET_ADMIN)) { 514 ret = -EPERM; 515 break; 516 } 517 goto set_sndbuf; 518 519 case SO_RCVBUF: 520 /* Don't error on this BSD doesn't and if you think 521 about it this is right. Otherwise apps have to 522 play 'guess the biggest size' games. RCVBUF/SNDBUF 523 are treated in BSD as hints */ 524 525 if (val > sysctl_rmem_max) 526 val = sysctl_rmem_max; 527set_rcvbuf: 528 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 529 /* 530 * We double it on the way in to account for 531 * "struct sk_buff" etc. overhead. Applications 532 * assume that the SO_RCVBUF setting they make will 533 * allow that much actual data to be received on that 534 * socket. 535 * 536 * Applications are unaware that "struct sk_buff" and 537 * other overheads allocate from the receive buffer 538 * during socket buffer allocation. 539 * 540 * And after considering the possible alternatives, 541 * returning the value we actually used in getsockopt 542 * is the most desirable behavior. 543 */ 544 if ((val * 2) < SOCK_MIN_RCVBUF) 545 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 546 else 547 sk->sk_rcvbuf = val * 2; 548 break; 549 550 case SO_RCVBUFFORCE: 551 if (!capable(CAP_NET_ADMIN)) { 552 ret = -EPERM; 553 break; 554 } 555 goto set_rcvbuf; 556 557 case SO_KEEPALIVE: 558#ifdef CONFIG_INET 559 if (sk->sk_protocol == IPPROTO_TCP) 560 tcp_set_keepalive(sk, valbool); 561#endif 562 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 563 break; 564 565 case SO_OOBINLINE: 566 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 567 break; 568 569 case SO_NO_CHECK: 570 sk->sk_no_check = valbool; 571 break; 572 573 case SO_PRIORITY: 574 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 575 sk->sk_priority = val; 576 else 577 ret = -EPERM; 578 break; 579 580 case SO_LINGER: 581 if (optlen < sizeof(ling)) { 582 ret = -EINVAL; /* 1003.1g */ 583 break; 584 } 585 if (copy_from_user(&ling,optval,sizeof(ling))) { 586 ret = -EFAULT; 587 break; 588 } 589 if (!ling.l_onoff) 590 sock_reset_flag(sk, SOCK_LINGER); 591 else { 592#if (BITS_PER_LONG == 32) 593 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 594 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 595 else 596#endif 597 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 598 sock_set_flag(sk, SOCK_LINGER); 599 } 600 break; 601 602 case SO_BSDCOMPAT: 603 sock_warn_obsolete_bsdism("setsockopt"); 604 break; 605 606 case SO_PASSCRED: 607 if (valbool) 608 set_bit(SOCK_PASSCRED, &sock->flags); 609 else 610 clear_bit(SOCK_PASSCRED, &sock->flags); 611 break; 612 613 case SO_TIMESTAMP: 614 case SO_TIMESTAMPNS: 615 if (valbool) { 616 if (optname == SO_TIMESTAMP) 617 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 618 else 619 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 620 sock_set_flag(sk, SOCK_RCVTSTAMP); 621 sock_enable_timestamp(sk); 622 } else { 623 sock_reset_flag(sk, SOCK_RCVTSTAMP); 624 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 625 } 626 break; 627 628 case SO_RCVLOWAT: 629 if (val < 0) 630 val = INT_MAX; 631 sk->sk_rcvlowat = val ? : 1; 632 break; 633 634 case SO_RCVTIMEO: 635 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 636 break; 637 638 case SO_SNDTIMEO: 639 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 640 break; 641 642 case SO_ATTACH_FILTER: 643 ret = -EINVAL; 644 if (optlen == sizeof(struct sock_fprog)) { 645 struct sock_fprog fprog; 646 647 ret = -EFAULT; 648 if (copy_from_user(&fprog, optval, sizeof(fprog))) 649 break; 650 651 ret = sk_attach_filter(&fprog, sk); 652 } 653 break; 654 655 case SO_DETACH_FILTER: 656 ret = sk_detach_filter(sk); 657 break; 658 659 case SO_PASSSEC: 660 if (valbool) 661 set_bit(SOCK_PASSSEC, &sock->flags); 662 else 663 clear_bit(SOCK_PASSSEC, &sock->flags); 664 break; 665 666 /* We implement the SO_SNDLOWAT etc to 667 not be settable (1003.1g 5.3) */ 668 default: 669 ret = -ENOPROTOOPT; 670 break; 671 } 672 release_sock(sk); 673 return ret; 674} 675 676 677int sock_getsockopt(struct socket *sock, int level, int optname, 678 char __user *optval, int __user *optlen) 679{ 680 struct sock *sk = sock->sk; 681 682 union { 683 int val; 684 struct linger ling; 685 struct timeval tm; 686 } v; 687 688 unsigned int lv = sizeof(int); 689 int len; 690 691 if (get_user(len, optlen)) 692 return -EFAULT; 693 if (len < 0) 694 return -EINVAL; 695 696 switch(optname) { 697 case SO_DEBUG: 698 v.val = sock_flag(sk, SOCK_DBG); 699 break; 700 701 case SO_DONTROUTE: 702 v.val = sock_flag(sk, SOCK_LOCALROUTE); 703 break; 704 705 case SO_BROADCAST: 706 v.val = !!sock_flag(sk, SOCK_BROADCAST); 707 break; 708 709 case SO_SNDBUF: 710 v.val = sk->sk_sndbuf; 711 break; 712 713 case SO_RCVBUF: 714 v.val = sk->sk_rcvbuf; 715 break; 716 717 case SO_REUSEADDR: 718 v.val = sk->sk_reuse; 719 break; 720 721 case SO_KEEPALIVE: 722 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 723 break; 724 725 case SO_TYPE: 726 v.val = sk->sk_type; 727 break; 728 729 case SO_ERROR: 730 v.val = -sock_error(sk); 731 if (v.val==0) 732 v.val = xchg(&sk->sk_err_soft, 0); 733 break; 734 735 case SO_OOBINLINE: 736 v.val = !!sock_flag(sk, SOCK_URGINLINE); 737 break; 738 739 case SO_NO_CHECK: 740 v.val = sk->sk_no_check; 741 break; 742 743 case SO_PRIORITY: 744 v.val = sk->sk_priority; 745 break; 746 747 case SO_LINGER: 748 lv = sizeof(v.ling); 749 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 750 v.ling.l_linger = sk->sk_lingertime / HZ; 751 break; 752 753 case SO_BSDCOMPAT: 754 sock_warn_obsolete_bsdism("getsockopt"); 755 break; 756 757 case SO_TIMESTAMP: 758 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 759 !sock_flag(sk, SOCK_RCVTSTAMPNS); 760 break; 761 762 case SO_TIMESTAMPNS: 763 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 764 break; 765 766 case SO_RCVTIMEO: 767 lv=sizeof(struct timeval); 768 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 769 v.tm.tv_sec = 0; 770 v.tm.tv_usec = 0; 771 } else { 772 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 773 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 774 } 775 break; 776 777 case SO_SNDTIMEO: 778 lv=sizeof(struct timeval); 779 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 780 v.tm.tv_sec = 0; 781 v.tm.tv_usec = 0; 782 } else { 783 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 784 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 785 } 786 break; 787 788 case SO_RCVLOWAT: 789 v.val = sk->sk_rcvlowat; 790 break; 791 792 case SO_SNDLOWAT: 793 v.val=1; 794 break; 795 796 case SO_PASSCRED: 797 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 798 break; 799 800 case SO_PEERCRED: 801 if (len > sizeof(sk->sk_peercred)) 802 len = sizeof(sk->sk_peercred); 803 if (copy_to_user(optval, &sk->sk_peercred, len)) 804 return -EFAULT; 805 goto lenout; 806 807 case SO_PEERNAME: 808 { 809 char address[128]; 810 811 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 812 return -ENOTCONN; 813 if (lv < len) 814 return -EINVAL; 815 if (copy_to_user(optval, address, len)) 816 return -EFAULT; 817 goto lenout; 818 } 819 820 /* Dubious BSD thing... Probably nobody even uses it, but 821 * the UNIX standard wants it for whatever reason... -DaveM 822 */ 823 case SO_ACCEPTCONN: 824 v.val = sk->sk_state == TCP_LISTEN; 825 break; 826 827 case SO_PASSSEC: 828 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 829 break; 830 831 case SO_PEERSEC: 832 return security_socket_getpeersec_stream(sock, optval, optlen, len); 833 834 default: 835 return -ENOPROTOOPT; 836 } 837 838 if (len > lv) 839 len = lv; 840 if (copy_to_user(optval, &v, len)) 841 return -EFAULT; 842lenout: 843 if (put_user(len, optlen)) 844 return -EFAULT; 845 return 0; 846} 847 848/* 849 * Initialize an sk_lock. 850 * 851 * (We also register the sk_lock with the lock validator.) 852 */ 853static inline void sock_lock_init(struct sock *sk) 854{ 855 sock_lock_init_class_and_name(sk, 856 af_family_slock_key_strings[sk->sk_family], 857 af_family_slock_keys + sk->sk_family, 858 af_family_key_strings[sk->sk_family], 859 af_family_keys + sk->sk_family); 860} 861 862static void sock_copy(struct sock *nsk, const struct sock *osk) 863{ 864#ifdef CONFIG_SECURITY_NETWORK 865 void *sptr = nsk->sk_security; 866#endif 867 868 memcpy(nsk, osk, osk->sk_prot->obj_size); 869#ifdef CONFIG_SECURITY_NETWORK 870 nsk->sk_security = sptr; 871 security_sk_clone(osk, nsk); 872#endif 873} 874 875static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 876 int family) 877{ 878 struct sock *sk; 879 struct kmem_cache *slab; 880 881 slab = prot->slab; 882 if (slab != NULL) 883 sk = kmem_cache_alloc(slab, priority); 884 else 885 sk = kmalloc(prot->obj_size, priority); 886 887 if (sk != NULL) { 888 if (security_sk_alloc(sk, family, priority)) 889 goto out_free; 890 891 if (!try_module_get(prot->owner)) 892 goto out_free_sec; 893 } 894 895 return sk; 896 897out_free_sec: 898 security_sk_free(sk); 899out_free: 900 if (slab != NULL) 901 kmem_cache_free(slab, sk); 902 else 903 kfree(sk); 904 return NULL; 905} 906 907static void sk_prot_free(struct proto *prot, struct sock *sk) 908{ 909 struct kmem_cache *slab; 910 struct module *owner; 911 912 owner = prot->owner; 913 slab = prot->slab; 914 915 security_sk_free(sk); 916 if (slab != NULL) 917 kmem_cache_free(slab, sk); 918 else 919 kfree(sk); 920 module_put(owner); 921} 922 923/** 924 * sk_alloc - All socket objects are allocated here 925 * @net: the applicable net namespace 926 * @family: protocol family 927 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 928 * @prot: struct proto associated with this new sock instance 929 * @zero_it: if we should zero the newly allocated sock 930 */ 931struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 932 struct proto *prot) 933{ 934 struct sock *sk; 935 936 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 937 if (sk) { 938 sk->sk_family = family; 939 /* 940 * See comment in struct sock definition to understand 941 * why we need sk_prot_creator -acme 942 */ 943 sk->sk_prot = sk->sk_prot_creator = prot; 944 sock_lock_init(sk); 945 sk->sk_net = get_net(net); 946 } 947 948 return sk; 949} 950 951void sk_free(struct sock *sk) 952{ 953 struct sk_filter *filter; 954 955 if (sk->sk_destruct) 956 sk->sk_destruct(sk); 957 958 filter = rcu_dereference(sk->sk_filter); 959 if (filter) { 960 sk_filter_uncharge(sk, filter); 961 rcu_assign_pointer(sk->sk_filter, NULL); 962 } 963 964 sock_disable_timestamp(sk); 965 966 if (atomic_read(&sk->sk_omem_alloc)) 967 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 968 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 969 970 put_net(sk->sk_net); 971 sk_prot_free(sk->sk_prot_creator, sk); 972} 973 974struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 975{ 976 struct sock *newsk; 977 978 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 979 if (newsk != NULL) { 980 struct sk_filter *filter; 981 982 sock_copy(newsk, sk); 983 984 /* SANITY */ 985 get_net(newsk->sk_net); 986 sk_node_init(&newsk->sk_node); 987 sock_lock_init(newsk); 988 bh_lock_sock(newsk); 989 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 990 991 atomic_set(&newsk->sk_rmem_alloc, 0); 992 atomic_set(&newsk->sk_wmem_alloc, 0); 993 atomic_set(&newsk->sk_omem_alloc, 0); 994 skb_queue_head_init(&newsk->sk_receive_queue); 995 skb_queue_head_init(&newsk->sk_write_queue); 996#ifdef CONFIG_NET_DMA 997 skb_queue_head_init(&newsk->sk_async_wait_queue); 998#endif 999 1000 rwlock_init(&newsk->sk_dst_lock); 1001 rwlock_init(&newsk->sk_callback_lock); 1002 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1003 af_callback_keys + newsk->sk_family, 1004 af_family_clock_key_strings[newsk->sk_family]); 1005 1006 newsk->sk_dst_cache = NULL; 1007 newsk->sk_wmem_queued = 0; 1008 newsk->sk_forward_alloc = 0; 1009 newsk->sk_send_head = NULL; 1010 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1011 1012 sock_reset_flag(newsk, SOCK_DONE); 1013 skb_queue_head_init(&newsk->sk_error_queue); 1014 1015 filter = newsk->sk_filter; 1016 if (filter != NULL) 1017 sk_filter_charge(newsk, filter); 1018 1019 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1020 /* It is still raw copy of parent, so invalidate 1021 * destructor and make plain sk_free() */ 1022 newsk->sk_destruct = NULL; 1023 sk_free(newsk); 1024 newsk = NULL; 1025 goto out; 1026 } 1027 1028 newsk->sk_err = 0; 1029 newsk->sk_priority = 0; 1030 atomic_set(&newsk->sk_refcnt, 2); 1031 1032 /* 1033 * Increment the counter in the same struct proto as the master 1034 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1035 * is the same as sk->sk_prot->socks, as this field was copied 1036 * with memcpy). 1037 * 1038 * This _changes_ the previous behaviour, where 1039 * tcp_create_openreq_child always was incrementing the 1040 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1041 * to be taken into account in all callers. -acme 1042 */ 1043 sk_refcnt_debug_inc(newsk); 1044 newsk->sk_socket = NULL; 1045 newsk->sk_sleep = NULL; 1046 1047 if (newsk->sk_prot->sockets_allocated) 1048 atomic_inc(newsk->sk_prot->sockets_allocated); 1049 } 1050out: 1051 return newsk; 1052} 1053 1054EXPORT_SYMBOL_GPL(sk_clone); 1055 1056void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1057{ 1058 __sk_dst_set(sk, dst); 1059 sk->sk_route_caps = dst->dev->features; 1060 if (sk->sk_route_caps & NETIF_F_GSO) 1061 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1062 if (sk_can_gso(sk)) { 1063 if (dst->header_len) 1064 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1065 else 1066 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1067 } 1068} 1069EXPORT_SYMBOL_GPL(sk_setup_caps); 1070 1071void __init sk_init(void) 1072{ 1073 if (num_physpages <= 4096) { 1074 sysctl_wmem_max = 32767; 1075 sysctl_rmem_max = 32767; 1076 sysctl_wmem_default = 32767; 1077 sysctl_rmem_default = 32767; 1078 } else if (num_physpages >= 131072) { 1079 sysctl_wmem_max = 131071; 1080 sysctl_rmem_max = 131071; 1081 } 1082} 1083 1084/* 1085 * Simple resource managers for sockets. 1086 */ 1087 1088 1089/* 1090 * Write buffer destructor automatically called from kfree_skb. 1091 */ 1092void sock_wfree(struct sk_buff *skb) 1093{ 1094 struct sock *sk = skb->sk; 1095 1096 /* In case it might be waiting for more memory. */ 1097 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1098 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1099 sk->sk_write_space(sk); 1100 sock_put(sk); 1101} 1102 1103/* 1104 * Read buffer destructor automatically called from kfree_skb. 1105 */ 1106void sock_rfree(struct sk_buff *skb) 1107{ 1108 struct sock *sk = skb->sk; 1109 1110 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1111} 1112 1113 1114int sock_i_uid(struct sock *sk) 1115{ 1116 int uid; 1117 1118 read_lock(&sk->sk_callback_lock); 1119 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1120 read_unlock(&sk->sk_callback_lock); 1121 return uid; 1122} 1123 1124unsigned long sock_i_ino(struct sock *sk) 1125{ 1126 unsigned long ino; 1127 1128 read_lock(&sk->sk_callback_lock); 1129 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1130 read_unlock(&sk->sk_callback_lock); 1131 return ino; 1132} 1133 1134/* 1135 * Allocate a skb from the socket's send buffer. 1136 */ 1137struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1138 gfp_t priority) 1139{ 1140 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1141 struct sk_buff * skb = alloc_skb(size, priority); 1142 if (skb) { 1143 skb_set_owner_w(skb, sk); 1144 return skb; 1145 } 1146 } 1147 return NULL; 1148} 1149 1150/* 1151 * Allocate a skb from the socket's receive buffer. 1152 */ 1153struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1154 gfp_t priority) 1155{ 1156 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1157 struct sk_buff *skb = alloc_skb(size, priority); 1158 if (skb) { 1159 skb_set_owner_r(skb, sk); 1160 return skb; 1161 } 1162 } 1163 return NULL; 1164} 1165 1166/* 1167 * Allocate a memory block from the socket's option memory buffer. 1168 */ 1169void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1170{ 1171 if ((unsigned)size <= sysctl_optmem_max && 1172 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1173 void *mem; 1174 /* First do the add, to avoid the race if kmalloc 1175 * might sleep. 1176 */ 1177 atomic_add(size, &sk->sk_omem_alloc); 1178 mem = kmalloc(size, priority); 1179 if (mem) 1180 return mem; 1181 atomic_sub(size, &sk->sk_omem_alloc); 1182 } 1183 return NULL; 1184} 1185 1186/* 1187 * Free an option memory block. 1188 */ 1189void sock_kfree_s(struct sock *sk, void *mem, int size) 1190{ 1191 kfree(mem); 1192 atomic_sub(size, &sk->sk_omem_alloc); 1193} 1194 1195/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1196 I think, these locks should be removed for datagram sockets. 1197 */ 1198static long sock_wait_for_wmem(struct sock * sk, long timeo) 1199{ 1200 DEFINE_WAIT(wait); 1201 1202 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1203 for (;;) { 1204 if (!timeo) 1205 break; 1206 if (signal_pending(current)) 1207 break; 1208 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1209 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1210 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1211 break; 1212 if (sk->sk_shutdown & SEND_SHUTDOWN) 1213 break; 1214 if (sk->sk_err) 1215 break; 1216 timeo = schedule_timeout(timeo); 1217 } 1218 finish_wait(sk->sk_sleep, &wait); 1219 return timeo; 1220} 1221 1222 1223/* 1224 * Generic send/receive buffer handlers 1225 */ 1226 1227static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1228 unsigned long header_len, 1229 unsigned long data_len, 1230 int noblock, int *errcode) 1231{ 1232 struct sk_buff *skb; 1233 gfp_t gfp_mask; 1234 long timeo; 1235 int err; 1236 1237 gfp_mask = sk->sk_allocation; 1238 if (gfp_mask & __GFP_WAIT) 1239 gfp_mask |= __GFP_REPEAT; 1240 1241 timeo = sock_sndtimeo(sk, noblock); 1242 while (1) { 1243 err = sock_error(sk); 1244 if (err != 0) 1245 goto failure; 1246 1247 err = -EPIPE; 1248 if (sk->sk_shutdown & SEND_SHUTDOWN) 1249 goto failure; 1250 1251 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1252 skb = alloc_skb(header_len, gfp_mask); 1253 if (skb) { 1254 int npages; 1255 int i; 1256 1257 /* No pages, we're done... */ 1258 if (!data_len) 1259 break; 1260 1261 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1262 skb->truesize += data_len; 1263 skb_shinfo(skb)->nr_frags = npages; 1264 for (i = 0; i < npages; i++) { 1265 struct page *page; 1266 skb_frag_t *frag; 1267 1268 page = alloc_pages(sk->sk_allocation, 0); 1269 if (!page) { 1270 err = -ENOBUFS; 1271 skb_shinfo(skb)->nr_frags = i; 1272 kfree_skb(skb); 1273 goto failure; 1274 } 1275 1276 frag = &skb_shinfo(skb)->frags[i]; 1277 frag->page = page; 1278 frag->page_offset = 0; 1279 frag->size = (data_len >= PAGE_SIZE ? 1280 PAGE_SIZE : 1281 data_len); 1282 data_len -= PAGE_SIZE; 1283 } 1284 1285 /* Full success... */ 1286 break; 1287 } 1288 err = -ENOBUFS; 1289 goto failure; 1290 } 1291 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1292 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1293 err = -EAGAIN; 1294 if (!timeo) 1295 goto failure; 1296 if (signal_pending(current)) 1297 goto interrupted; 1298 timeo = sock_wait_for_wmem(sk, timeo); 1299 } 1300 1301 skb_set_owner_w(skb, sk); 1302 return skb; 1303 1304interrupted: 1305 err = sock_intr_errno(timeo); 1306failure: 1307 *errcode = err; 1308 return NULL; 1309} 1310 1311struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1312 int noblock, int *errcode) 1313{ 1314 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1315} 1316 1317static void __lock_sock(struct sock *sk) 1318{ 1319 DEFINE_WAIT(wait); 1320 1321 for (;;) { 1322 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1323 TASK_UNINTERRUPTIBLE); 1324 spin_unlock_bh(&sk->sk_lock.slock); 1325 schedule(); 1326 spin_lock_bh(&sk->sk_lock.slock); 1327 if (!sock_owned_by_user(sk)) 1328 break; 1329 } 1330 finish_wait(&sk->sk_lock.wq, &wait); 1331} 1332 1333static void __release_sock(struct sock *sk) 1334{ 1335 struct sk_buff *skb = sk->sk_backlog.head; 1336 1337 do { 1338 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1339 bh_unlock_sock(sk); 1340 1341 do { 1342 struct sk_buff *next = skb->next; 1343 1344 skb->next = NULL; 1345 sk->sk_backlog_rcv(sk, skb); 1346 1347 /* 1348 * We are in process context here with softirqs 1349 * disabled, use cond_resched_softirq() to preempt. 1350 * This is safe to do because we've taken the backlog 1351 * queue private: 1352 */ 1353 cond_resched_softirq(); 1354 1355 skb = next; 1356 } while (skb != NULL); 1357 1358 bh_lock_sock(sk); 1359 } while ((skb = sk->sk_backlog.head) != NULL); 1360} 1361 1362/** 1363 * sk_wait_data - wait for data to arrive at sk_receive_queue 1364 * @sk: sock to wait on 1365 * @timeo: for how long 1366 * 1367 * Now socket state including sk->sk_err is changed only under lock, 1368 * hence we may omit checks after joining wait queue. 1369 * We check receive queue before schedule() only as optimization; 1370 * it is very likely that release_sock() added new data. 1371 */ 1372int sk_wait_data(struct sock *sk, long *timeo) 1373{ 1374 int rc; 1375 DEFINE_WAIT(wait); 1376 1377 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1378 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1379 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1380 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1381 finish_wait(sk->sk_sleep, &wait); 1382 return rc; 1383} 1384 1385EXPORT_SYMBOL(sk_wait_data); 1386 1387/* 1388 * Set of default routines for initialising struct proto_ops when 1389 * the protocol does not support a particular function. In certain 1390 * cases where it makes no sense for a protocol to have a "do nothing" 1391 * function, some default processing is provided. 1392 */ 1393 1394int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1395{ 1396 return -EOPNOTSUPP; 1397} 1398 1399int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1400 int len, int flags) 1401{ 1402 return -EOPNOTSUPP; 1403} 1404 1405int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1406{ 1407 return -EOPNOTSUPP; 1408} 1409 1410int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1411{ 1412 return -EOPNOTSUPP; 1413} 1414 1415int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1416 int *len, int peer) 1417{ 1418 return -EOPNOTSUPP; 1419} 1420 1421unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1422{ 1423 return 0; 1424} 1425 1426int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1427{ 1428 return -EOPNOTSUPP; 1429} 1430 1431int sock_no_listen(struct socket *sock, int backlog) 1432{ 1433 return -EOPNOTSUPP; 1434} 1435 1436int sock_no_shutdown(struct socket *sock, int how) 1437{ 1438 return -EOPNOTSUPP; 1439} 1440 1441int sock_no_setsockopt(struct socket *sock, int level, int optname, 1442 char __user *optval, int optlen) 1443{ 1444 return -EOPNOTSUPP; 1445} 1446 1447int sock_no_getsockopt(struct socket *sock, int level, int optname, 1448 char __user *optval, int __user *optlen) 1449{ 1450 return -EOPNOTSUPP; 1451} 1452 1453int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1454 size_t len) 1455{ 1456 return -EOPNOTSUPP; 1457} 1458 1459int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1460 size_t len, int flags) 1461{ 1462 return -EOPNOTSUPP; 1463} 1464 1465int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1466{ 1467 /* Mirror missing mmap method error code */ 1468 return -ENODEV; 1469} 1470 1471ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1472{ 1473 ssize_t res; 1474 struct msghdr msg = {.msg_flags = flags}; 1475 struct kvec iov; 1476 char *kaddr = kmap(page); 1477 iov.iov_base = kaddr + offset; 1478 iov.iov_len = size; 1479 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1480 kunmap(page); 1481 return res; 1482} 1483 1484/* 1485 * Default Socket Callbacks 1486 */ 1487 1488static void sock_def_wakeup(struct sock *sk) 1489{ 1490 read_lock(&sk->sk_callback_lock); 1491 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1492 wake_up_interruptible_all(sk->sk_sleep); 1493 read_unlock(&sk->sk_callback_lock); 1494} 1495 1496static void sock_def_error_report(struct sock *sk) 1497{ 1498 read_lock(&sk->sk_callback_lock); 1499 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1500 wake_up_interruptible(sk->sk_sleep); 1501 sk_wake_async(sk,0,POLL_ERR); 1502 read_unlock(&sk->sk_callback_lock); 1503} 1504 1505static void sock_def_readable(struct sock *sk, int len) 1506{ 1507 read_lock(&sk->sk_callback_lock); 1508 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1509 wake_up_interruptible(sk->sk_sleep); 1510 sk_wake_async(sk,1,POLL_IN); 1511 read_unlock(&sk->sk_callback_lock); 1512} 1513 1514static void sock_def_write_space(struct sock *sk) 1515{ 1516 read_lock(&sk->sk_callback_lock); 1517 1518 /* Do not wake up a writer until he can make "significant" 1519 * progress. --DaveM 1520 */ 1521 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1522 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1523 wake_up_interruptible(sk->sk_sleep); 1524 1525 /* Should agree with poll, otherwise some programs break */ 1526 if (sock_writeable(sk)) 1527 sk_wake_async(sk, 2, POLL_OUT); 1528 } 1529 1530 read_unlock(&sk->sk_callback_lock); 1531} 1532 1533static void sock_def_destruct(struct sock *sk) 1534{ 1535 kfree(sk->sk_protinfo); 1536} 1537 1538void sk_send_sigurg(struct sock *sk) 1539{ 1540 if (sk->sk_socket && sk->sk_socket->file) 1541 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1542 sk_wake_async(sk, 3, POLL_PRI); 1543} 1544 1545void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1546 unsigned long expires) 1547{ 1548 if (!mod_timer(timer, expires)) 1549 sock_hold(sk); 1550} 1551 1552EXPORT_SYMBOL(sk_reset_timer); 1553 1554void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1555{ 1556 if (timer_pending(timer) && del_timer(timer)) 1557 __sock_put(sk); 1558} 1559 1560EXPORT_SYMBOL(sk_stop_timer); 1561 1562void sock_init_data(struct socket *sock, struct sock *sk) 1563{ 1564 skb_queue_head_init(&sk->sk_receive_queue); 1565 skb_queue_head_init(&sk->sk_write_queue); 1566 skb_queue_head_init(&sk->sk_error_queue); 1567#ifdef CONFIG_NET_DMA 1568 skb_queue_head_init(&sk->sk_async_wait_queue); 1569#endif 1570 1571 sk->sk_send_head = NULL; 1572 1573 init_timer(&sk->sk_timer); 1574 1575 sk->sk_allocation = GFP_KERNEL; 1576 sk->sk_rcvbuf = sysctl_rmem_default; 1577 sk->sk_sndbuf = sysctl_wmem_default; 1578 sk->sk_state = TCP_CLOSE; 1579 sk->sk_socket = sock; 1580 1581 sock_set_flag(sk, SOCK_ZAPPED); 1582 1583 if (sock) { 1584 sk->sk_type = sock->type; 1585 sk->sk_sleep = &sock->wait; 1586 sock->sk = sk; 1587 } else 1588 sk->sk_sleep = NULL; 1589 1590 rwlock_init(&sk->sk_dst_lock); 1591 rwlock_init(&sk->sk_callback_lock); 1592 lockdep_set_class_and_name(&sk->sk_callback_lock, 1593 af_callback_keys + sk->sk_family, 1594 af_family_clock_key_strings[sk->sk_family]); 1595 1596 sk->sk_state_change = sock_def_wakeup; 1597 sk->sk_data_ready = sock_def_readable; 1598 sk->sk_write_space = sock_def_write_space; 1599 sk->sk_error_report = sock_def_error_report; 1600 sk->sk_destruct = sock_def_destruct; 1601 1602 sk->sk_sndmsg_page = NULL; 1603 sk->sk_sndmsg_off = 0; 1604 1605 sk->sk_peercred.pid = 0; 1606 sk->sk_peercred.uid = -1; 1607 sk->sk_peercred.gid = -1; 1608 sk->sk_write_pending = 0; 1609 sk->sk_rcvlowat = 1; 1610 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1611 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1612 1613 sk->sk_stamp = ktime_set(-1L, -1L); 1614 1615 atomic_set(&sk->sk_refcnt, 1); 1616 atomic_set(&sk->sk_drops, 0); 1617} 1618 1619void fastcall lock_sock_nested(struct sock *sk, int subclass) 1620{ 1621 might_sleep(); 1622 spin_lock_bh(&sk->sk_lock.slock); 1623 if (sk->sk_lock.owned) 1624 __lock_sock(sk); 1625 sk->sk_lock.owned = 1; 1626 spin_unlock(&sk->sk_lock.slock); 1627 /* 1628 * The sk_lock has mutex_lock() semantics here: 1629 */ 1630 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1631 local_bh_enable(); 1632} 1633 1634EXPORT_SYMBOL(lock_sock_nested); 1635 1636void fastcall release_sock(struct sock *sk) 1637{ 1638 /* 1639 * The sk_lock has mutex_unlock() semantics: 1640 */ 1641 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1642 1643 spin_lock_bh(&sk->sk_lock.slock); 1644 if (sk->sk_backlog.tail) 1645 __release_sock(sk); 1646 sk->sk_lock.owned = 0; 1647 if (waitqueue_active(&sk->sk_lock.wq)) 1648 wake_up(&sk->sk_lock.wq); 1649 spin_unlock_bh(&sk->sk_lock.slock); 1650} 1651EXPORT_SYMBOL(release_sock); 1652 1653int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1654{ 1655 struct timeval tv; 1656 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1657 sock_enable_timestamp(sk); 1658 tv = ktime_to_timeval(sk->sk_stamp); 1659 if (tv.tv_sec == -1) 1660 return -ENOENT; 1661 if (tv.tv_sec == 0) { 1662 sk->sk_stamp = ktime_get_real(); 1663 tv = ktime_to_timeval(sk->sk_stamp); 1664 } 1665 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1666} 1667EXPORT_SYMBOL(sock_get_timestamp); 1668 1669int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1670{ 1671 struct timespec ts; 1672 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1673 sock_enable_timestamp(sk); 1674 ts = ktime_to_timespec(sk->sk_stamp); 1675 if (ts.tv_sec == -1) 1676 return -ENOENT; 1677 if (ts.tv_sec == 0) { 1678 sk->sk_stamp = ktime_get_real(); 1679 ts = ktime_to_timespec(sk->sk_stamp); 1680 } 1681 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1682} 1683EXPORT_SYMBOL(sock_get_timestampns); 1684 1685void sock_enable_timestamp(struct sock *sk) 1686{ 1687 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1688 sock_set_flag(sk, SOCK_TIMESTAMP); 1689 net_enable_timestamp(); 1690 } 1691} 1692 1693/* 1694 * Get a socket option on an socket. 1695 * 1696 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1697 * asynchronous errors should be reported by getsockopt. We assume 1698 * this means if you specify SO_ERROR (otherwise whats the point of it). 1699 */ 1700int sock_common_getsockopt(struct socket *sock, int level, int optname, 1701 char __user *optval, int __user *optlen) 1702{ 1703 struct sock *sk = sock->sk; 1704 1705 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1706} 1707 1708EXPORT_SYMBOL(sock_common_getsockopt); 1709 1710#ifdef CONFIG_COMPAT 1711int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1712 char __user *optval, int __user *optlen) 1713{ 1714 struct sock *sk = sock->sk; 1715 1716 if (sk->sk_prot->compat_getsockopt != NULL) 1717 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1718 optval, optlen); 1719 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1720} 1721EXPORT_SYMBOL(compat_sock_common_getsockopt); 1722#endif 1723 1724int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1725 struct msghdr *msg, size_t size, int flags) 1726{ 1727 struct sock *sk = sock->sk; 1728 int addr_len = 0; 1729 int err; 1730 1731 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1732 flags & ~MSG_DONTWAIT, &addr_len); 1733 if (err >= 0) 1734 msg->msg_namelen = addr_len; 1735 return err; 1736} 1737 1738EXPORT_SYMBOL(sock_common_recvmsg); 1739 1740/* 1741 * Set socket options on an inet socket. 1742 */ 1743int sock_common_setsockopt(struct socket *sock, int level, int optname, 1744 char __user *optval, int optlen) 1745{ 1746 struct sock *sk = sock->sk; 1747 1748 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1749} 1750 1751EXPORT_SYMBOL(sock_common_setsockopt); 1752 1753#ifdef CONFIG_COMPAT 1754int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1755 char __user *optval, int optlen) 1756{ 1757 struct sock *sk = sock->sk; 1758 1759 if (sk->sk_prot->compat_setsockopt != NULL) 1760 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1761 optval, optlen); 1762 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1763} 1764EXPORT_SYMBOL(compat_sock_common_setsockopt); 1765#endif 1766 1767void sk_common_release(struct sock *sk) 1768{ 1769 if (sk->sk_prot->destroy) 1770 sk->sk_prot->destroy(sk); 1771 1772 /* 1773 * Observation: when sock_common_release is called, processes have 1774 * no access to socket. But net still has. 1775 * Step one, detach it from networking: 1776 * 1777 * A. Remove from hash tables. 1778 */ 1779 1780 sk->sk_prot->unhash(sk); 1781 1782 /* 1783 * In this point socket cannot receive new packets, but it is possible 1784 * that some packets are in flight because some CPU runs receiver and 1785 * did hash table lookup before we unhashed socket. They will achieve 1786 * receive queue and will be purged by socket destructor. 1787 * 1788 * Also we still have packets pending on receive queue and probably, 1789 * our own packets waiting in device queues. sock_destroy will drain 1790 * receive queue, but transmitted packets will delay socket destruction 1791 * until the last reference will be released. 1792 */ 1793 1794 sock_orphan(sk); 1795 1796 xfrm_sk_free_policy(sk); 1797 1798 sk_refcnt_debug_release(sk); 1799 sock_put(sk); 1800} 1801 1802EXPORT_SYMBOL(sk_common_release); 1803 1804static DEFINE_RWLOCK(proto_list_lock); 1805static LIST_HEAD(proto_list); 1806 1807#ifdef CONFIG_SMP 1808/* 1809 * Define default functions to keep track of inuse sockets per protocol 1810 * Note that often used protocols use dedicated functions to get a speed increase. 1811 * (see DEFINE_PROTO_INUSE/REF_PROTO_INUSE) 1812 */ 1813static void inuse_add(struct proto *prot, int inc) 1814{ 1815 per_cpu_ptr(prot->inuse_ptr, smp_processor_id())[0] += inc; 1816} 1817 1818static int inuse_get(const struct proto *prot) 1819{ 1820 int res = 0, cpu; 1821 for_each_possible_cpu(cpu) 1822 res += per_cpu_ptr(prot->inuse_ptr, cpu)[0]; 1823 return res; 1824} 1825 1826static int inuse_init(struct proto *prot) 1827{ 1828 if (!prot->inuse_getval || !prot->inuse_add) { 1829 prot->inuse_ptr = alloc_percpu(int); 1830 if (prot->inuse_ptr == NULL) 1831 return -ENOBUFS; 1832 1833 prot->inuse_getval = inuse_get; 1834 prot->inuse_add = inuse_add; 1835 } 1836 return 0; 1837} 1838 1839static void inuse_fini(struct proto *prot) 1840{ 1841 if (prot->inuse_ptr != NULL) { 1842 free_percpu(prot->inuse_ptr); 1843 prot->inuse_ptr = NULL; 1844 prot->inuse_getval = NULL; 1845 prot->inuse_add = NULL; 1846 } 1847} 1848#else 1849static inline int inuse_init(struct proto *prot) 1850{ 1851 return 0; 1852} 1853 1854static inline void inuse_fini(struct proto *prot) 1855{ 1856} 1857#endif 1858 1859int proto_register(struct proto *prot, int alloc_slab) 1860{ 1861 char *request_sock_slab_name = NULL; 1862 char *timewait_sock_slab_name; 1863 1864 if (inuse_init(prot)) 1865 goto out; 1866 1867 if (alloc_slab) { 1868 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1869 SLAB_HWCACHE_ALIGN, NULL); 1870 1871 if (prot->slab == NULL) { 1872 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1873 prot->name); 1874 goto out_free_inuse; 1875 } 1876 1877 if (prot->rsk_prot != NULL) { 1878 static const char mask[] = "request_sock_%s"; 1879 1880 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1881 if (request_sock_slab_name == NULL) 1882 goto out_free_sock_slab; 1883 1884 sprintf(request_sock_slab_name, mask, prot->name); 1885 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1886 prot->rsk_prot->obj_size, 0, 1887 SLAB_HWCACHE_ALIGN, NULL); 1888 1889 if (prot->rsk_prot->slab == NULL) { 1890 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1891 prot->name); 1892 goto out_free_request_sock_slab_name; 1893 } 1894 } 1895 1896 if (prot->twsk_prot != NULL) { 1897 static const char mask[] = "tw_sock_%s"; 1898 1899 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1900 1901 if (timewait_sock_slab_name == NULL) 1902 goto out_free_request_sock_slab; 1903 1904 sprintf(timewait_sock_slab_name, mask, prot->name); 1905 prot->twsk_prot->twsk_slab = 1906 kmem_cache_create(timewait_sock_slab_name, 1907 prot->twsk_prot->twsk_obj_size, 1908 0, SLAB_HWCACHE_ALIGN, 1909 NULL); 1910 if (prot->twsk_prot->twsk_slab == NULL) 1911 goto out_free_timewait_sock_slab_name; 1912 } 1913 } 1914 1915 write_lock(&proto_list_lock); 1916 list_add(&prot->node, &proto_list); 1917 write_unlock(&proto_list_lock); 1918 return 0; 1919 1920out_free_timewait_sock_slab_name: 1921 kfree(timewait_sock_slab_name); 1922out_free_request_sock_slab: 1923 if (prot->rsk_prot && prot->rsk_prot->slab) { 1924 kmem_cache_destroy(prot->rsk_prot->slab); 1925 prot->rsk_prot->slab = NULL; 1926 } 1927out_free_request_sock_slab_name: 1928 kfree(request_sock_slab_name); 1929out_free_sock_slab: 1930 kmem_cache_destroy(prot->slab); 1931 prot->slab = NULL; 1932out_free_inuse: 1933 inuse_fini(prot); 1934out: 1935 return -ENOBUFS; 1936} 1937 1938EXPORT_SYMBOL(proto_register); 1939 1940void proto_unregister(struct proto *prot) 1941{ 1942 write_lock(&proto_list_lock); 1943 list_del(&prot->node); 1944 write_unlock(&proto_list_lock); 1945 1946 inuse_fini(prot); 1947 if (prot->slab != NULL) { 1948 kmem_cache_destroy(prot->slab); 1949 prot->slab = NULL; 1950 } 1951 1952 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 1953 const char *name = kmem_cache_name(prot->rsk_prot->slab); 1954 1955 kmem_cache_destroy(prot->rsk_prot->slab); 1956 kfree(name); 1957 prot->rsk_prot->slab = NULL; 1958 } 1959 1960 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 1961 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 1962 1963 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 1964 kfree(name); 1965 prot->twsk_prot->twsk_slab = NULL; 1966 } 1967} 1968 1969EXPORT_SYMBOL(proto_unregister); 1970 1971#ifdef CONFIG_PROC_FS 1972static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1973{ 1974 read_lock(&proto_list_lock); 1975 return seq_list_start_head(&proto_list, *pos); 1976} 1977 1978static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1979{ 1980 return seq_list_next(v, &proto_list, pos); 1981} 1982 1983static void proto_seq_stop(struct seq_file *seq, void *v) 1984{ 1985 read_unlock(&proto_list_lock); 1986} 1987 1988static char proto_method_implemented(const void *method) 1989{ 1990 return method == NULL ? 'n' : 'y'; 1991} 1992 1993static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1994{ 1995 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1996 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1997 proto->name, 1998 proto->obj_size, 1999 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 2000 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2001 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2002 proto->max_header, 2003 proto->slab == NULL ? "no" : "yes", 2004 module_name(proto->owner), 2005 proto_method_implemented(proto->close), 2006 proto_method_implemented(proto->connect), 2007 proto_method_implemented(proto->disconnect), 2008 proto_method_implemented(proto->accept), 2009 proto_method_implemented(proto->ioctl), 2010 proto_method_implemented(proto->init), 2011 proto_method_implemented(proto->destroy), 2012 proto_method_implemented(proto->shutdown), 2013 proto_method_implemented(proto->setsockopt), 2014 proto_method_implemented(proto->getsockopt), 2015 proto_method_implemented(proto->sendmsg), 2016 proto_method_implemented(proto->recvmsg), 2017 proto_method_implemented(proto->sendpage), 2018 proto_method_implemented(proto->bind), 2019 proto_method_implemented(proto->backlog_rcv), 2020 proto_method_implemented(proto->hash), 2021 proto_method_implemented(proto->unhash), 2022 proto_method_implemented(proto->get_port), 2023 proto_method_implemented(proto->enter_memory_pressure)); 2024} 2025 2026static int proto_seq_show(struct seq_file *seq, void *v) 2027{ 2028 if (v == &proto_list) 2029 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2030 "protocol", 2031 "size", 2032 "sockets", 2033 "memory", 2034 "press", 2035 "maxhdr", 2036 "slab", 2037 "module", 2038 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2039 else 2040 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2041 return 0; 2042} 2043 2044static const struct seq_operations proto_seq_ops = { 2045 .start = proto_seq_start, 2046 .next = proto_seq_next, 2047 .stop = proto_seq_stop, 2048 .show = proto_seq_show, 2049}; 2050 2051static int proto_seq_open(struct inode *inode, struct file *file) 2052{ 2053 return seq_open(file, &proto_seq_ops); 2054} 2055 2056static const struct file_operations proto_seq_fops = { 2057 .owner = THIS_MODULE, 2058 .open = proto_seq_open, 2059 .read = seq_read, 2060 .llseek = seq_lseek, 2061 .release = seq_release, 2062}; 2063 2064static int __init proto_init(void) 2065{ 2066 /* register /proc/net/protocols */ 2067 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 2068} 2069 2070subsys_initcall(proto_init); 2071 2072#endif /* PROC_FS */ 2073 2074EXPORT_SYMBOL(sk_alloc); 2075EXPORT_SYMBOL(sk_free); 2076EXPORT_SYMBOL(sk_send_sigurg); 2077EXPORT_SYMBOL(sock_alloc_send_skb); 2078EXPORT_SYMBOL(sock_init_data); 2079EXPORT_SYMBOL(sock_kfree_s); 2080EXPORT_SYMBOL(sock_kmalloc); 2081EXPORT_SYMBOL(sock_no_accept); 2082EXPORT_SYMBOL(sock_no_bind); 2083EXPORT_SYMBOL(sock_no_connect); 2084EXPORT_SYMBOL(sock_no_getname); 2085EXPORT_SYMBOL(sock_no_getsockopt); 2086EXPORT_SYMBOL(sock_no_ioctl); 2087EXPORT_SYMBOL(sock_no_listen); 2088EXPORT_SYMBOL(sock_no_mmap); 2089EXPORT_SYMBOL(sock_no_poll); 2090EXPORT_SYMBOL(sock_no_recvmsg); 2091EXPORT_SYMBOL(sock_no_sendmsg); 2092EXPORT_SYMBOL(sock_no_sendpage); 2093EXPORT_SYMBOL(sock_no_setsockopt); 2094EXPORT_SYMBOL(sock_no_shutdown); 2095EXPORT_SYMBOL(sock_no_socketpair); 2096EXPORT_SYMBOL(sock_rfree); 2097EXPORT_SYMBOL(sock_setsockopt); 2098EXPORT_SYMBOL(sock_wfree); 2099EXPORT_SYMBOL(sock_wmalloc); 2100EXPORT_SYMBOL(sock_i_uid); 2101EXPORT_SYMBOL(sock_i_ino); 2102EXPORT_SYMBOL(sysctl_optmem_max); 2103