sock.c revision 45af1754bc09926b5e062bda24f789d7b320939f
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-AF_CAN" , 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-AF_CAN" , 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 if (!sk_rmem_schedule(sk, skb->truesize)) { 286 err = -ENOBUFS; 287 goto out; 288 } 289 290 skb->dev = NULL; 291 skb_set_owner_r(skb, sk); 292 293 /* Cache the SKB length before we tack it onto the receive 294 * queue. Once it is added it no longer belongs to us and 295 * may be freed by other threads of control pulling packets 296 * from the queue. 297 */ 298 skb_len = skb->len; 299 300 skb_queue_tail(&sk->sk_receive_queue, skb); 301 302 if (!sock_flag(sk, SOCK_DEAD)) 303 sk->sk_data_ready(sk, skb_len); 304out: 305 return err; 306} 307EXPORT_SYMBOL(sock_queue_rcv_skb); 308 309int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 310{ 311 int rc = NET_RX_SUCCESS; 312 313 if (sk_filter(sk, skb)) 314 goto discard_and_relse; 315 316 skb->dev = NULL; 317 318 if (nested) 319 bh_lock_sock_nested(sk); 320 else 321 bh_lock_sock(sk); 322 if (!sock_owned_by_user(sk)) { 323 /* 324 * trylock + unlock semantics: 325 */ 326 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 327 328 rc = sk->sk_backlog_rcv(sk, skb); 329 330 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 331 } else 332 sk_add_backlog(sk, skb); 333 bh_unlock_sock(sk); 334out: 335 sock_put(sk); 336 return rc; 337discard_and_relse: 338 kfree_skb(skb); 339 goto out; 340} 341EXPORT_SYMBOL(sk_receive_skb); 342 343struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 344{ 345 struct dst_entry *dst = sk->sk_dst_cache; 346 347 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 348 sk->sk_dst_cache = NULL; 349 dst_release(dst); 350 return NULL; 351 } 352 353 return dst; 354} 355EXPORT_SYMBOL(__sk_dst_check); 356 357struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 358{ 359 struct dst_entry *dst = sk_dst_get(sk); 360 361 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 362 sk_dst_reset(sk); 363 dst_release(dst); 364 return NULL; 365 } 366 367 return dst; 368} 369EXPORT_SYMBOL(sk_dst_check); 370 371static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 372{ 373 int ret = -ENOPROTOOPT; 374#ifdef CONFIG_NETDEVICES 375 struct net *net = sk->sk_net; 376 char devname[IFNAMSIZ]; 377 int index; 378 379 /* Sorry... */ 380 ret = -EPERM; 381 if (!capable(CAP_NET_RAW)) 382 goto out; 383 384 ret = -EINVAL; 385 if (optlen < 0) 386 goto out; 387 388 /* Bind this socket to a particular device like "eth0", 389 * as specified in the passed interface name. If the 390 * name is "" or the option length is zero the socket 391 * is not bound. 392 */ 393 if (optlen > IFNAMSIZ - 1) 394 optlen = IFNAMSIZ - 1; 395 memset(devname, 0, sizeof(devname)); 396 397 ret = -EFAULT; 398 if (copy_from_user(devname, optval, optlen)) 399 goto out; 400 401 if (devname[0] == '\0') { 402 index = 0; 403 } else { 404 struct net_device *dev = dev_get_by_name(net, devname); 405 406 ret = -ENODEV; 407 if (!dev) 408 goto out; 409 410 index = dev->ifindex; 411 dev_put(dev); 412 } 413 414 lock_sock(sk); 415 sk->sk_bound_dev_if = index; 416 sk_dst_reset(sk); 417 release_sock(sk); 418 419 ret = 0; 420 421out: 422#endif 423 424 return ret; 425} 426 427static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 428{ 429 if (valbool) 430 sock_set_flag(sk, bit); 431 else 432 sock_reset_flag(sk, bit); 433} 434 435/* 436 * This is meant for all protocols to use and covers goings on 437 * at the socket level. Everything here is generic. 438 */ 439 440int sock_setsockopt(struct socket *sock, int level, int optname, 441 char __user *optval, int optlen) 442{ 443 struct sock *sk=sock->sk; 444 int val; 445 int valbool; 446 struct linger ling; 447 int ret = 0; 448 449 /* 450 * Options without arguments 451 */ 452 453#ifdef SO_DONTLINGER /* Compatibility item... */ 454 if (optname == SO_DONTLINGER) { 455 lock_sock(sk); 456 sock_reset_flag(sk, SOCK_LINGER); 457 release_sock(sk); 458 return 0; 459 } 460#endif 461 462 if (optname == SO_BINDTODEVICE) 463 return sock_bindtodevice(sk, optval, optlen); 464 465 if (optlen < sizeof(int)) 466 return -EINVAL; 467 468 if (get_user(val, (int __user *)optval)) 469 return -EFAULT; 470 471 valbool = val?1:0; 472 473 lock_sock(sk); 474 475 switch(optname) { 476 case SO_DEBUG: 477 if (val && !capable(CAP_NET_ADMIN)) { 478 ret = -EACCES; 479 } else 480 sock_valbool_flag(sk, SOCK_DBG, valbool); 481 break; 482 case SO_REUSEADDR: 483 sk->sk_reuse = valbool; 484 break; 485 case SO_TYPE: 486 case SO_ERROR: 487 ret = -ENOPROTOOPT; 488 break; 489 case SO_DONTROUTE: 490 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 491 break; 492 case SO_BROADCAST: 493 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 494 break; 495 case SO_SNDBUF: 496 /* Don't error on this BSD doesn't and if you think 497 about it this is right. Otherwise apps have to 498 play 'guess the biggest size' games. RCVBUF/SNDBUF 499 are treated in BSD as hints */ 500 501 if (val > sysctl_wmem_max) 502 val = sysctl_wmem_max; 503set_sndbuf: 504 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 505 if ((val * 2) < SOCK_MIN_SNDBUF) 506 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 507 else 508 sk->sk_sndbuf = val * 2; 509 510 /* 511 * Wake up sending tasks if we 512 * upped the value. 513 */ 514 sk->sk_write_space(sk); 515 break; 516 517 case SO_SNDBUFFORCE: 518 if (!capable(CAP_NET_ADMIN)) { 519 ret = -EPERM; 520 break; 521 } 522 goto set_sndbuf; 523 524 case SO_RCVBUF: 525 /* Don't error on this BSD doesn't and if you think 526 about it this is right. Otherwise apps have to 527 play 'guess the biggest size' games. RCVBUF/SNDBUF 528 are treated in BSD as hints */ 529 530 if (val > sysctl_rmem_max) 531 val = sysctl_rmem_max; 532set_rcvbuf: 533 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 534 /* 535 * We double it on the way in to account for 536 * "struct sk_buff" etc. overhead. Applications 537 * assume that the SO_RCVBUF setting they make will 538 * allow that much actual data to be received on that 539 * socket. 540 * 541 * Applications are unaware that "struct sk_buff" and 542 * other overheads allocate from the receive buffer 543 * during socket buffer allocation. 544 * 545 * And after considering the possible alternatives, 546 * returning the value we actually used in getsockopt 547 * is the most desirable behavior. 548 */ 549 if ((val * 2) < SOCK_MIN_RCVBUF) 550 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 551 else 552 sk->sk_rcvbuf = val * 2; 553 break; 554 555 case SO_RCVBUFFORCE: 556 if (!capable(CAP_NET_ADMIN)) { 557 ret = -EPERM; 558 break; 559 } 560 goto set_rcvbuf; 561 562 case SO_KEEPALIVE: 563#ifdef CONFIG_INET 564 if (sk->sk_protocol == IPPROTO_TCP) 565 tcp_set_keepalive(sk, valbool); 566#endif 567 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 568 break; 569 570 case SO_OOBINLINE: 571 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 572 break; 573 574 case SO_NO_CHECK: 575 sk->sk_no_check = valbool; 576 break; 577 578 case SO_PRIORITY: 579 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 580 sk->sk_priority = val; 581 else 582 ret = -EPERM; 583 break; 584 585 case SO_LINGER: 586 if (optlen < sizeof(ling)) { 587 ret = -EINVAL; /* 1003.1g */ 588 break; 589 } 590 if (copy_from_user(&ling,optval,sizeof(ling))) { 591 ret = -EFAULT; 592 break; 593 } 594 if (!ling.l_onoff) 595 sock_reset_flag(sk, SOCK_LINGER); 596 else { 597#if (BITS_PER_LONG == 32) 598 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 599 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 600 else 601#endif 602 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 603 sock_set_flag(sk, SOCK_LINGER); 604 } 605 break; 606 607 case SO_BSDCOMPAT: 608 sock_warn_obsolete_bsdism("setsockopt"); 609 break; 610 611 case SO_PASSCRED: 612 if (valbool) 613 set_bit(SOCK_PASSCRED, &sock->flags); 614 else 615 clear_bit(SOCK_PASSCRED, &sock->flags); 616 break; 617 618 case SO_TIMESTAMP: 619 case SO_TIMESTAMPNS: 620 if (valbool) { 621 if (optname == SO_TIMESTAMP) 622 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 623 else 624 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 625 sock_set_flag(sk, SOCK_RCVTSTAMP); 626 sock_enable_timestamp(sk); 627 } else { 628 sock_reset_flag(sk, SOCK_RCVTSTAMP); 629 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 630 } 631 break; 632 633 case SO_RCVLOWAT: 634 if (val < 0) 635 val = INT_MAX; 636 sk->sk_rcvlowat = val ? : 1; 637 break; 638 639 case SO_RCVTIMEO: 640 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 641 break; 642 643 case SO_SNDTIMEO: 644 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 645 break; 646 647 case SO_ATTACH_FILTER: 648 ret = -EINVAL; 649 if (optlen == sizeof(struct sock_fprog)) { 650 struct sock_fprog fprog; 651 652 ret = -EFAULT; 653 if (copy_from_user(&fprog, optval, sizeof(fprog))) 654 break; 655 656 ret = sk_attach_filter(&fprog, sk); 657 } 658 break; 659 660 case SO_DETACH_FILTER: 661 ret = sk_detach_filter(sk); 662 break; 663 664 case SO_PASSSEC: 665 if (valbool) 666 set_bit(SOCK_PASSSEC, &sock->flags); 667 else 668 clear_bit(SOCK_PASSSEC, &sock->flags); 669 break; 670 case SO_MARK: 671 if (!capable(CAP_NET_ADMIN)) 672 ret = -EPERM; 673 else { 674 sk->sk_mark = val; 675 } 676 break; 677 678 /* We implement the SO_SNDLOWAT etc to 679 not be settable (1003.1g 5.3) */ 680 default: 681 ret = -ENOPROTOOPT; 682 break; 683 } 684 release_sock(sk); 685 return ret; 686} 687 688 689int sock_getsockopt(struct socket *sock, int level, int optname, 690 char __user *optval, int __user *optlen) 691{ 692 struct sock *sk = sock->sk; 693 694 union { 695 int val; 696 struct linger ling; 697 struct timeval tm; 698 } v; 699 700 unsigned int lv = sizeof(int); 701 int len; 702 703 if (get_user(len, optlen)) 704 return -EFAULT; 705 if (len < 0) 706 return -EINVAL; 707 708 switch(optname) { 709 case SO_DEBUG: 710 v.val = sock_flag(sk, SOCK_DBG); 711 break; 712 713 case SO_DONTROUTE: 714 v.val = sock_flag(sk, SOCK_LOCALROUTE); 715 break; 716 717 case SO_BROADCAST: 718 v.val = !!sock_flag(sk, SOCK_BROADCAST); 719 break; 720 721 case SO_SNDBUF: 722 v.val = sk->sk_sndbuf; 723 break; 724 725 case SO_RCVBUF: 726 v.val = sk->sk_rcvbuf; 727 break; 728 729 case SO_REUSEADDR: 730 v.val = sk->sk_reuse; 731 break; 732 733 case SO_KEEPALIVE: 734 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 735 break; 736 737 case SO_TYPE: 738 v.val = sk->sk_type; 739 break; 740 741 case SO_ERROR: 742 v.val = -sock_error(sk); 743 if (v.val==0) 744 v.val = xchg(&sk->sk_err_soft, 0); 745 break; 746 747 case SO_OOBINLINE: 748 v.val = !!sock_flag(sk, SOCK_URGINLINE); 749 break; 750 751 case SO_NO_CHECK: 752 v.val = sk->sk_no_check; 753 break; 754 755 case SO_PRIORITY: 756 v.val = sk->sk_priority; 757 break; 758 759 case SO_LINGER: 760 lv = sizeof(v.ling); 761 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 762 v.ling.l_linger = sk->sk_lingertime / HZ; 763 break; 764 765 case SO_BSDCOMPAT: 766 sock_warn_obsolete_bsdism("getsockopt"); 767 break; 768 769 case SO_TIMESTAMP: 770 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 771 !sock_flag(sk, SOCK_RCVTSTAMPNS); 772 break; 773 774 case SO_TIMESTAMPNS: 775 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 776 break; 777 778 case SO_RCVTIMEO: 779 lv=sizeof(struct timeval); 780 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 781 v.tm.tv_sec = 0; 782 v.tm.tv_usec = 0; 783 } else { 784 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 785 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 786 } 787 break; 788 789 case SO_SNDTIMEO: 790 lv=sizeof(struct timeval); 791 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 792 v.tm.tv_sec = 0; 793 v.tm.tv_usec = 0; 794 } else { 795 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 796 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 797 } 798 break; 799 800 case SO_RCVLOWAT: 801 v.val = sk->sk_rcvlowat; 802 break; 803 804 case SO_SNDLOWAT: 805 v.val=1; 806 break; 807 808 case SO_PASSCRED: 809 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 810 break; 811 812 case SO_PEERCRED: 813 if (len > sizeof(sk->sk_peercred)) 814 len = sizeof(sk->sk_peercred); 815 if (copy_to_user(optval, &sk->sk_peercred, len)) 816 return -EFAULT; 817 goto lenout; 818 819 case SO_PEERNAME: 820 { 821 char address[128]; 822 823 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 824 return -ENOTCONN; 825 if (lv < len) 826 return -EINVAL; 827 if (copy_to_user(optval, address, len)) 828 return -EFAULT; 829 goto lenout; 830 } 831 832 /* Dubious BSD thing... Probably nobody even uses it, but 833 * the UNIX standard wants it for whatever reason... -DaveM 834 */ 835 case SO_ACCEPTCONN: 836 v.val = sk->sk_state == TCP_LISTEN; 837 break; 838 839 case SO_PASSSEC: 840 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 841 break; 842 843 case SO_PEERSEC: 844 return security_socket_getpeersec_stream(sock, optval, optlen, len); 845 846 case SO_MARK: 847 v.val = sk->sk_mark; 848 break; 849 850 default: 851 return -ENOPROTOOPT; 852 } 853 854 if (len > lv) 855 len = lv; 856 if (copy_to_user(optval, &v, len)) 857 return -EFAULT; 858lenout: 859 if (put_user(len, optlen)) 860 return -EFAULT; 861 return 0; 862} 863 864/* 865 * Initialize an sk_lock. 866 * 867 * (We also register the sk_lock with the lock validator.) 868 */ 869static inline void sock_lock_init(struct sock *sk) 870{ 871 sock_lock_init_class_and_name(sk, 872 af_family_slock_key_strings[sk->sk_family], 873 af_family_slock_keys + sk->sk_family, 874 af_family_key_strings[sk->sk_family], 875 af_family_keys + sk->sk_family); 876} 877 878static void sock_copy(struct sock *nsk, const struct sock *osk) 879{ 880#ifdef CONFIG_SECURITY_NETWORK 881 void *sptr = nsk->sk_security; 882#endif 883 884 memcpy(nsk, osk, osk->sk_prot->obj_size); 885#ifdef CONFIG_SECURITY_NETWORK 886 nsk->sk_security = sptr; 887 security_sk_clone(osk, nsk); 888#endif 889} 890 891static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 892 int family) 893{ 894 struct sock *sk; 895 struct kmem_cache *slab; 896 897 slab = prot->slab; 898 if (slab != NULL) 899 sk = kmem_cache_alloc(slab, priority); 900 else 901 sk = kmalloc(prot->obj_size, priority); 902 903 if (sk != NULL) { 904 if (security_sk_alloc(sk, family, priority)) 905 goto out_free; 906 907 if (!try_module_get(prot->owner)) 908 goto out_free_sec; 909 } 910 911 return sk; 912 913out_free_sec: 914 security_sk_free(sk); 915out_free: 916 if (slab != NULL) 917 kmem_cache_free(slab, sk); 918 else 919 kfree(sk); 920 return NULL; 921} 922 923static void sk_prot_free(struct proto *prot, struct sock *sk) 924{ 925 struct kmem_cache *slab; 926 struct module *owner; 927 928 owner = prot->owner; 929 slab = prot->slab; 930 931 security_sk_free(sk); 932 if (slab != NULL) 933 kmem_cache_free(slab, sk); 934 else 935 kfree(sk); 936 module_put(owner); 937} 938 939/** 940 * sk_alloc - All socket objects are allocated here 941 * @net: the applicable net namespace 942 * @family: protocol family 943 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 944 * @prot: struct proto associated with this new sock instance 945 * @zero_it: if we should zero the newly allocated sock 946 */ 947struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 948 struct proto *prot) 949{ 950 struct sock *sk; 951 952 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 953 if (sk) { 954 sk->sk_family = family; 955 /* 956 * See comment in struct sock definition to understand 957 * why we need sk_prot_creator -acme 958 */ 959 sk->sk_prot = sk->sk_prot_creator = prot; 960 sock_lock_init(sk); 961 sk->sk_net = get_net(net); 962 } 963 964 return sk; 965} 966 967void sk_free(struct sock *sk) 968{ 969 struct sk_filter *filter; 970 971 if (sk->sk_destruct) 972 sk->sk_destruct(sk); 973 974 filter = rcu_dereference(sk->sk_filter); 975 if (filter) { 976 sk_filter_uncharge(sk, filter); 977 rcu_assign_pointer(sk->sk_filter, NULL); 978 } 979 980 sock_disable_timestamp(sk); 981 982 if (atomic_read(&sk->sk_omem_alloc)) 983 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 984 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 985 986 put_net(sk->sk_net); 987 sk_prot_free(sk->sk_prot_creator, sk); 988} 989 990/* 991 * Last sock_put should drop referrence to sk->sk_net. It has already 992 * been dropped in sk_change_net. Taking referrence to stopping namespace 993 * is not an option. 994 * Take referrence to a socket to remove it from hash _alive_ and after that 995 * destroy it in the context of init_net. 996 */ 997void sk_release_kernel(struct sock *sk) 998{ 999 if (sk == NULL || sk->sk_socket == NULL) 1000 return; 1001 1002 sock_hold(sk); 1003 sock_release(sk->sk_socket); 1004 sk->sk_net = get_net(&init_net); 1005 sock_put(sk); 1006} 1007EXPORT_SYMBOL(sk_release_kernel); 1008 1009struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1010{ 1011 struct sock *newsk; 1012 1013 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1014 if (newsk != NULL) { 1015 struct sk_filter *filter; 1016 1017 sock_copy(newsk, sk); 1018 1019 /* SANITY */ 1020 get_net(newsk->sk_net); 1021 sk_node_init(&newsk->sk_node); 1022 sock_lock_init(newsk); 1023 bh_lock_sock(newsk); 1024 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1025 1026 atomic_set(&newsk->sk_rmem_alloc, 0); 1027 atomic_set(&newsk->sk_wmem_alloc, 0); 1028 atomic_set(&newsk->sk_omem_alloc, 0); 1029 skb_queue_head_init(&newsk->sk_receive_queue); 1030 skb_queue_head_init(&newsk->sk_write_queue); 1031#ifdef CONFIG_NET_DMA 1032 skb_queue_head_init(&newsk->sk_async_wait_queue); 1033#endif 1034 1035 rwlock_init(&newsk->sk_dst_lock); 1036 rwlock_init(&newsk->sk_callback_lock); 1037 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1038 af_callback_keys + newsk->sk_family, 1039 af_family_clock_key_strings[newsk->sk_family]); 1040 1041 newsk->sk_dst_cache = NULL; 1042 newsk->sk_wmem_queued = 0; 1043 newsk->sk_forward_alloc = 0; 1044 newsk->sk_send_head = NULL; 1045 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1046 1047 sock_reset_flag(newsk, SOCK_DONE); 1048 skb_queue_head_init(&newsk->sk_error_queue); 1049 1050 filter = newsk->sk_filter; 1051 if (filter != NULL) 1052 sk_filter_charge(newsk, filter); 1053 1054 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1055 /* It is still raw copy of parent, so invalidate 1056 * destructor and make plain sk_free() */ 1057 newsk->sk_destruct = NULL; 1058 sk_free(newsk); 1059 newsk = NULL; 1060 goto out; 1061 } 1062 1063 newsk->sk_err = 0; 1064 newsk->sk_priority = 0; 1065 atomic_set(&newsk->sk_refcnt, 2); 1066 1067 /* 1068 * Increment the counter in the same struct proto as the master 1069 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1070 * is the same as sk->sk_prot->socks, as this field was copied 1071 * with memcpy). 1072 * 1073 * This _changes_ the previous behaviour, where 1074 * tcp_create_openreq_child always was incrementing the 1075 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1076 * to be taken into account in all callers. -acme 1077 */ 1078 sk_refcnt_debug_inc(newsk); 1079 newsk->sk_socket = NULL; 1080 newsk->sk_sleep = NULL; 1081 1082 if (newsk->sk_prot->sockets_allocated) 1083 atomic_inc(newsk->sk_prot->sockets_allocated); 1084 } 1085out: 1086 return newsk; 1087} 1088 1089EXPORT_SYMBOL_GPL(sk_clone); 1090 1091void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1092{ 1093 __sk_dst_set(sk, dst); 1094 sk->sk_route_caps = dst->dev->features; 1095 if (sk->sk_route_caps & NETIF_F_GSO) 1096 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1097 if (sk_can_gso(sk)) { 1098 if (dst->header_len) 1099 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1100 else 1101 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1102 } 1103} 1104EXPORT_SYMBOL_GPL(sk_setup_caps); 1105 1106void __init sk_init(void) 1107{ 1108 if (num_physpages <= 4096) { 1109 sysctl_wmem_max = 32767; 1110 sysctl_rmem_max = 32767; 1111 sysctl_wmem_default = 32767; 1112 sysctl_rmem_default = 32767; 1113 } else if (num_physpages >= 131072) { 1114 sysctl_wmem_max = 131071; 1115 sysctl_rmem_max = 131071; 1116 } 1117} 1118 1119/* 1120 * Simple resource managers for sockets. 1121 */ 1122 1123 1124/* 1125 * Write buffer destructor automatically called from kfree_skb. 1126 */ 1127void sock_wfree(struct sk_buff *skb) 1128{ 1129 struct sock *sk = skb->sk; 1130 1131 /* In case it might be waiting for more memory. */ 1132 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1133 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1134 sk->sk_write_space(sk); 1135 sock_put(sk); 1136} 1137 1138/* 1139 * Read buffer destructor automatically called from kfree_skb. 1140 */ 1141void sock_rfree(struct sk_buff *skb) 1142{ 1143 struct sock *sk = skb->sk; 1144 1145 skb_truesize_check(skb); 1146 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1147 sk_mem_uncharge(skb->sk, skb->truesize); 1148} 1149 1150 1151int sock_i_uid(struct sock *sk) 1152{ 1153 int uid; 1154 1155 read_lock(&sk->sk_callback_lock); 1156 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1157 read_unlock(&sk->sk_callback_lock); 1158 return uid; 1159} 1160 1161unsigned long sock_i_ino(struct sock *sk) 1162{ 1163 unsigned long ino; 1164 1165 read_lock(&sk->sk_callback_lock); 1166 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1167 read_unlock(&sk->sk_callback_lock); 1168 return ino; 1169} 1170 1171/* 1172 * Allocate a skb from the socket's send buffer. 1173 */ 1174struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1175 gfp_t priority) 1176{ 1177 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1178 struct sk_buff * skb = alloc_skb(size, priority); 1179 if (skb) { 1180 skb_set_owner_w(skb, sk); 1181 return skb; 1182 } 1183 } 1184 return NULL; 1185} 1186 1187/* 1188 * Allocate a skb from the socket's receive buffer. 1189 */ 1190struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1191 gfp_t priority) 1192{ 1193 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1194 struct sk_buff *skb = alloc_skb(size, priority); 1195 if (skb) { 1196 skb_set_owner_r(skb, sk); 1197 return skb; 1198 } 1199 } 1200 return NULL; 1201} 1202 1203/* 1204 * Allocate a memory block from the socket's option memory buffer. 1205 */ 1206void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1207{ 1208 if ((unsigned)size <= sysctl_optmem_max && 1209 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1210 void *mem; 1211 /* First do the add, to avoid the race if kmalloc 1212 * might sleep. 1213 */ 1214 atomic_add(size, &sk->sk_omem_alloc); 1215 mem = kmalloc(size, priority); 1216 if (mem) 1217 return mem; 1218 atomic_sub(size, &sk->sk_omem_alloc); 1219 } 1220 return NULL; 1221} 1222 1223/* 1224 * Free an option memory block. 1225 */ 1226void sock_kfree_s(struct sock *sk, void *mem, int size) 1227{ 1228 kfree(mem); 1229 atomic_sub(size, &sk->sk_omem_alloc); 1230} 1231 1232/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1233 I think, these locks should be removed for datagram sockets. 1234 */ 1235static long sock_wait_for_wmem(struct sock * sk, long timeo) 1236{ 1237 DEFINE_WAIT(wait); 1238 1239 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1240 for (;;) { 1241 if (!timeo) 1242 break; 1243 if (signal_pending(current)) 1244 break; 1245 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1246 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1247 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1248 break; 1249 if (sk->sk_shutdown & SEND_SHUTDOWN) 1250 break; 1251 if (sk->sk_err) 1252 break; 1253 timeo = schedule_timeout(timeo); 1254 } 1255 finish_wait(sk->sk_sleep, &wait); 1256 return timeo; 1257} 1258 1259 1260/* 1261 * Generic send/receive buffer handlers 1262 */ 1263 1264static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1265 unsigned long header_len, 1266 unsigned long data_len, 1267 int noblock, int *errcode) 1268{ 1269 struct sk_buff *skb; 1270 gfp_t gfp_mask; 1271 long timeo; 1272 int err; 1273 1274 gfp_mask = sk->sk_allocation; 1275 if (gfp_mask & __GFP_WAIT) 1276 gfp_mask |= __GFP_REPEAT; 1277 1278 timeo = sock_sndtimeo(sk, noblock); 1279 while (1) { 1280 err = sock_error(sk); 1281 if (err != 0) 1282 goto failure; 1283 1284 err = -EPIPE; 1285 if (sk->sk_shutdown & SEND_SHUTDOWN) 1286 goto failure; 1287 1288 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1289 skb = alloc_skb(header_len, gfp_mask); 1290 if (skb) { 1291 int npages; 1292 int i; 1293 1294 /* No pages, we're done... */ 1295 if (!data_len) 1296 break; 1297 1298 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1299 skb->truesize += data_len; 1300 skb_shinfo(skb)->nr_frags = npages; 1301 for (i = 0; i < npages; i++) { 1302 struct page *page; 1303 skb_frag_t *frag; 1304 1305 page = alloc_pages(sk->sk_allocation, 0); 1306 if (!page) { 1307 err = -ENOBUFS; 1308 skb_shinfo(skb)->nr_frags = i; 1309 kfree_skb(skb); 1310 goto failure; 1311 } 1312 1313 frag = &skb_shinfo(skb)->frags[i]; 1314 frag->page = page; 1315 frag->page_offset = 0; 1316 frag->size = (data_len >= PAGE_SIZE ? 1317 PAGE_SIZE : 1318 data_len); 1319 data_len -= PAGE_SIZE; 1320 } 1321 1322 /* Full success... */ 1323 break; 1324 } 1325 err = -ENOBUFS; 1326 goto failure; 1327 } 1328 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1329 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1330 err = -EAGAIN; 1331 if (!timeo) 1332 goto failure; 1333 if (signal_pending(current)) 1334 goto interrupted; 1335 timeo = sock_wait_for_wmem(sk, timeo); 1336 } 1337 1338 skb_set_owner_w(skb, sk); 1339 return skb; 1340 1341interrupted: 1342 err = sock_intr_errno(timeo); 1343failure: 1344 *errcode = err; 1345 return NULL; 1346} 1347 1348struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1349 int noblock, int *errcode) 1350{ 1351 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1352} 1353 1354static void __lock_sock(struct sock *sk) 1355{ 1356 DEFINE_WAIT(wait); 1357 1358 for (;;) { 1359 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1360 TASK_UNINTERRUPTIBLE); 1361 spin_unlock_bh(&sk->sk_lock.slock); 1362 schedule(); 1363 spin_lock_bh(&sk->sk_lock.slock); 1364 if (!sock_owned_by_user(sk)) 1365 break; 1366 } 1367 finish_wait(&sk->sk_lock.wq, &wait); 1368} 1369 1370static void __release_sock(struct sock *sk) 1371{ 1372 struct sk_buff *skb = sk->sk_backlog.head; 1373 1374 do { 1375 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1376 bh_unlock_sock(sk); 1377 1378 do { 1379 struct sk_buff *next = skb->next; 1380 1381 skb->next = NULL; 1382 sk->sk_backlog_rcv(sk, skb); 1383 1384 /* 1385 * We are in process context here with softirqs 1386 * disabled, use cond_resched_softirq() to preempt. 1387 * This is safe to do because we've taken the backlog 1388 * queue private: 1389 */ 1390 cond_resched_softirq(); 1391 1392 skb = next; 1393 } while (skb != NULL); 1394 1395 bh_lock_sock(sk); 1396 } while ((skb = sk->sk_backlog.head) != NULL); 1397} 1398 1399/** 1400 * sk_wait_data - wait for data to arrive at sk_receive_queue 1401 * @sk: sock to wait on 1402 * @timeo: for how long 1403 * 1404 * Now socket state including sk->sk_err is changed only under lock, 1405 * hence we may omit checks after joining wait queue. 1406 * We check receive queue before schedule() only as optimization; 1407 * it is very likely that release_sock() added new data. 1408 */ 1409int sk_wait_data(struct sock *sk, long *timeo) 1410{ 1411 int rc; 1412 DEFINE_WAIT(wait); 1413 1414 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1415 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1416 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1417 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1418 finish_wait(sk->sk_sleep, &wait); 1419 return rc; 1420} 1421 1422EXPORT_SYMBOL(sk_wait_data); 1423 1424/** 1425 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1426 * @sk: socket 1427 * @size: memory size to allocate 1428 * @kind: allocation type 1429 * 1430 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1431 * rmem allocation. This function assumes that protocols which have 1432 * memory_pressure use sk_wmem_queued as write buffer accounting. 1433 */ 1434int __sk_mem_schedule(struct sock *sk, int size, int kind) 1435{ 1436 struct proto *prot = sk->sk_prot; 1437 int amt = sk_mem_pages(size); 1438 int allocated; 1439 1440 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1441 allocated = atomic_add_return(amt, prot->memory_allocated); 1442 1443 /* Under limit. */ 1444 if (allocated <= prot->sysctl_mem[0]) { 1445 if (prot->memory_pressure && *prot->memory_pressure) 1446 *prot->memory_pressure = 0; 1447 return 1; 1448 } 1449 1450 /* Under pressure. */ 1451 if (allocated > prot->sysctl_mem[1]) 1452 if (prot->enter_memory_pressure) 1453 prot->enter_memory_pressure(); 1454 1455 /* Over hard limit. */ 1456 if (allocated > prot->sysctl_mem[2]) 1457 goto suppress_allocation; 1458 1459 /* guarantee minimum buffer size under pressure */ 1460 if (kind == SK_MEM_RECV) { 1461 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1462 return 1; 1463 } else { /* SK_MEM_SEND */ 1464 if (sk->sk_type == SOCK_STREAM) { 1465 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1466 return 1; 1467 } else if (atomic_read(&sk->sk_wmem_alloc) < 1468 prot->sysctl_wmem[0]) 1469 return 1; 1470 } 1471 1472 if (prot->memory_pressure) { 1473 if (!*prot->memory_pressure || 1474 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) * 1475 sk_mem_pages(sk->sk_wmem_queued + 1476 atomic_read(&sk->sk_rmem_alloc) + 1477 sk->sk_forward_alloc)) 1478 return 1; 1479 } 1480 1481suppress_allocation: 1482 1483 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1484 sk_stream_moderate_sndbuf(sk); 1485 1486 /* Fail only if socket is _under_ its sndbuf. 1487 * In this case we cannot block, so that we have to fail. 1488 */ 1489 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1490 return 1; 1491 } 1492 1493 /* Alas. Undo changes. */ 1494 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1495 atomic_sub(amt, prot->memory_allocated); 1496 return 0; 1497} 1498 1499EXPORT_SYMBOL(__sk_mem_schedule); 1500 1501/** 1502 * __sk_reclaim - reclaim memory_allocated 1503 * @sk: socket 1504 */ 1505void __sk_mem_reclaim(struct sock *sk) 1506{ 1507 struct proto *prot = sk->sk_prot; 1508 1509 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1510 prot->memory_allocated); 1511 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1512 1513 if (prot->memory_pressure && *prot->memory_pressure && 1514 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1515 *prot->memory_pressure = 0; 1516} 1517 1518EXPORT_SYMBOL(__sk_mem_reclaim); 1519 1520 1521/* 1522 * Set of default routines for initialising struct proto_ops when 1523 * the protocol does not support a particular function. In certain 1524 * cases where it makes no sense for a protocol to have a "do nothing" 1525 * function, some default processing is provided. 1526 */ 1527 1528int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1529{ 1530 return -EOPNOTSUPP; 1531} 1532 1533int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1534 int len, int flags) 1535{ 1536 return -EOPNOTSUPP; 1537} 1538 1539int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1540{ 1541 return -EOPNOTSUPP; 1542} 1543 1544int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1545{ 1546 return -EOPNOTSUPP; 1547} 1548 1549int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1550 int *len, int peer) 1551{ 1552 return -EOPNOTSUPP; 1553} 1554 1555unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1556{ 1557 return 0; 1558} 1559 1560int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1561{ 1562 return -EOPNOTSUPP; 1563} 1564 1565int sock_no_listen(struct socket *sock, int backlog) 1566{ 1567 return -EOPNOTSUPP; 1568} 1569 1570int sock_no_shutdown(struct socket *sock, int how) 1571{ 1572 return -EOPNOTSUPP; 1573} 1574 1575int sock_no_setsockopt(struct socket *sock, int level, int optname, 1576 char __user *optval, int optlen) 1577{ 1578 return -EOPNOTSUPP; 1579} 1580 1581int sock_no_getsockopt(struct socket *sock, int level, int optname, 1582 char __user *optval, int __user *optlen) 1583{ 1584 return -EOPNOTSUPP; 1585} 1586 1587int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1588 size_t len) 1589{ 1590 return -EOPNOTSUPP; 1591} 1592 1593int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1594 size_t len, int flags) 1595{ 1596 return -EOPNOTSUPP; 1597} 1598 1599int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1600{ 1601 /* Mirror missing mmap method error code */ 1602 return -ENODEV; 1603} 1604 1605ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1606{ 1607 ssize_t res; 1608 struct msghdr msg = {.msg_flags = flags}; 1609 struct kvec iov; 1610 char *kaddr = kmap(page); 1611 iov.iov_base = kaddr + offset; 1612 iov.iov_len = size; 1613 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1614 kunmap(page); 1615 return res; 1616} 1617 1618/* 1619 * Default Socket Callbacks 1620 */ 1621 1622static void sock_def_wakeup(struct sock *sk) 1623{ 1624 read_lock(&sk->sk_callback_lock); 1625 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1626 wake_up_interruptible_all(sk->sk_sleep); 1627 read_unlock(&sk->sk_callback_lock); 1628} 1629 1630static void sock_def_error_report(struct sock *sk) 1631{ 1632 read_lock(&sk->sk_callback_lock); 1633 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1634 wake_up_interruptible(sk->sk_sleep); 1635 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1636 read_unlock(&sk->sk_callback_lock); 1637} 1638 1639static void sock_def_readable(struct sock *sk, int len) 1640{ 1641 read_lock(&sk->sk_callback_lock); 1642 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1643 wake_up_interruptible(sk->sk_sleep); 1644 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1645 read_unlock(&sk->sk_callback_lock); 1646} 1647 1648static void sock_def_write_space(struct sock *sk) 1649{ 1650 read_lock(&sk->sk_callback_lock); 1651 1652 /* Do not wake up a writer until he can make "significant" 1653 * progress. --DaveM 1654 */ 1655 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1656 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1657 wake_up_interruptible(sk->sk_sleep); 1658 1659 /* Should agree with poll, otherwise some programs break */ 1660 if (sock_writeable(sk)) 1661 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1662 } 1663 1664 read_unlock(&sk->sk_callback_lock); 1665} 1666 1667static void sock_def_destruct(struct sock *sk) 1668{ 1669 kfree(sk->sk_protinfo); 1670} 1671 1672void sk_send_sigurg(struct sock *sk) 1673{ 1674 if (sk->sk_socket && sk->sk_socket->file) 1675 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1676 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1677} 1678 1679void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1680 unsigned long expires) 1681{ 1682 if (!mod_timer(timer, expires)) 1683 sock_hold(sk); 1684} 1685 1686EXPORT_SYMBOL(sk_reset_timer); 1687 1688void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1689{ 1690 if (timer_pending(timer) && del_timer(timer)) 1691 __sock_put(sk); 1692} 1693 1694EXPORT_SYMBOL(sk_stop_timer); 1695 1696void sock_init_data(struct socket *sock, struct sock *sk) 1697{ 1698 skb_queue_head_init(&sk->sk_receive_queue); 1699 skb_queue_head_init(&sk->sk_write_queue); 1700 skb_queue_head_init(&sk->sk_error_queue); 1701#ifdef CONFIG_NET_DMA 1702 skb_queue_head_init(&sk->sk_async_wait_queue); 1703#endif 1704 1705 sk->sk_send_head = NULL; 1706 1707 init_timer(&sk->sk_timer); 1708 1709 sk->sk_allocation = GFP_KERNEL; 1710 sk->sk_rcvbuf = sysctl_rmem_default; 1711 sk->sk_sndbuf = sysctl_wmem_default; 1712 sk->sk_state = TCP_CLOSE; 1713 sk->sk_socket = sock; 1714 1715 sock_set_flag(sk, SOCK_ZAPPED); 1716 1717 if (sock) { 1718 sk->sk_type = sock->type; 1719 sk->sk_sleep = &sock->wait; 1720 sock->sk = sk; 1721 } else 1722 sk->sk_sleep = NULL; 1723 1724 rwlock_init(&sk->sk_dst_lock); 1725 rwlock_init(&sk->sk_callback_lock); 1726 lockdep_set_class_and_name(&sk->sk_callback_lock, 1727 af_callback_keys + sk->sk_family, 1728 af_family_clock_key_strings[sk->sk_family]); 1729 1730 sk->sk_state_change = sock_def_wakeup; 1731 sk->sk_data_ready = sock_def_readable; 1732 sk->sk_write_space = sock_def_write_space; 1733 sk->sk_error_report = sock_def_error_report; 1734 sk->sk_destruct = sock_def_destruct; 1735 1736 sk->sk_sndmsg_page = NULL; 1737 sk->sk_sndmsg_off = 0; 1738 1739 sk->sk_peercred.pid = 0; 1740 sk->sk_peercred.uid = -1; 1741 sk->sk_peercred.gid = -1; 1742 sk->sk_write_pending = 0; 1743 sk->sk_rcvlowat = 1; 1744 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1745 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1746 1747 sk->sk_stamp = ktime_set(-1L, -1L); 1748 1749 atomic_set(&sk->sk_refcnt, 1); 1750 atomic_set(&sk->sk_drops, 0); 1751} 1752 1753void lock_sock_nested(struct sock *sk, int subclass) 1754{ 1755 might_sleep(); 1756 spin_lock_bh(&sk->sk_lock.slock); 1757 if (sk->sk_lock.owned) 1758 __lock_sock(sk); 1759 sk->sk_lock.owned = 1; 1760 spin_unlock(&sk->sk_lock.slock); 1761 /* 1762 * The sk_lock has mutex_lock() semantics here: 1763 */ 1764 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1765 local_bh_enable(); 1766} 1767 1768EXPORT_SYMBOL(lock_sock_nested); 1769 1770void release_sock(struct sock *sk) 1771{ 1772 /* 1773 * The sk_lock has mutex_unlock() semantics: 1774 */ 1775 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1776 1777 spin_lock_bh(&sk->sk_lock.slock); 1778 if (sk->sk_backlog.tail) 1779 __release_sock(sk); 1780 sk->sk_lock.owned = 0; 1781 if (waitqueue_active(&sk->sk_lock.wq)) 1782 wake_up(&sk->sk_lock.wq); 1783 spin_unlock_bh(&sk->sk_lock.slock); 1784} 1785EXPORT_SYMBOL(release_sock); 1786 1787int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1788{ 1789 struct timeval tv; 1790 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1791 sock_enable_timestamp(sk); 1792 tv = ktime_to_timeval(sk->sk_stamp); 1793 if (tv.tv_sec == -1) 1794 return -ENOENT; 1795 if (tv.tv_sec == 0) { 1796 sk->sk_stamp = ktime_get_real(); 1797 tv = ktime_to_timeval(sk->sk_stamp); 1798 } 1799 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1800} 1801EXPORT_SYMBOL(sock_get_timestamp); 1802 1803int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1804{ 1805 struct timespec ts; 1806 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1807 sock_enable_timestamp(sk); 1808 ts = ktime_to_timespec(sk->sk_stamp); 1809 if (ts.tv_sec == -1) 1810 return -ENOENT; 1811 if (ts.tv_sec == 0) { 1812 sk->sk_stamp = ktime_get_real(); 1813 ts = ktime_to_timespec(sk->sk_stamp); 1814 } 1815 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1816} 1817EXPORT_SYMBOL(sock_get_timestampns); 1818 1819void sock_enable_timestamp(struct sock *sk) 1820{ 1821 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1822 sock_set_flag(sk, SOCK_TIMESTAMP); 1823 net_enable_timestamp(); 1824 } 1825} 1826 1827/* 1828 * Get a socket option on an socket. 1829 * 1830 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1831 * asynchronous errors should be reported by getsockopt. We assume 1832 * this means if you specify SO_ERROR (otherwise whats the point of it). 1833 */ 1834int sock_common_getsockopt(struct socket *sock, int level, int optname, 1835 char __user *optval, int __user *optlen) 1836{ 1837 struct sock *sk = sock->sk; 1838 1839 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1840} 1841 1842EXPORT_SYMBOL(sock_common_getsockopt); 1843 1844#ifdef CONFIG_COMPAT 1845int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1846 char __user *optval, int __user *optlen) 1847{ 1848 struct sock *sk = sock->sk; 1849 1850 if (sk->sk_prot->compat_getsockopt != NULL) 1851 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1852 optval, optlen); 1853 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1854} 1855EXPORT_SYMBOL(compat_sock_common_getsockopt); 1856#endif 1857 1858int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1859 struct msghdr *msg, size_t size, int flags) 1860{ 1861 struct sock *sk = sock->sk; 1862 int addr_len = 0; 1863 int err; 1864 1865 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1866 flags & ~MSG_DONTWAIT, &addr_len); 1867 if (err >= 0) 1868 msg->msg_namelen = addr_len; 1869 return err; 1870} 1871 1872EXPORT_SYMBOL(sock_common_recvmsg); 1873 1874/* 1875 * Set socket options on an inet socket. 1876 */ 1877int sock_common_setsockopt(struct socket *sock, int level, int optname, 1878 char __user *optval, int optlen) 1879{ 1880 struct sock *sk = sock->sk; 1881 1882 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1883} 1884 1885EXPORT_SYMBOL(sock_common_setsockopt); 1886 1887#ifdef CONFIG_COMPAT 1888int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1889 char __user *optval, int optlen) 1890{ 1891 struct sock *sk = sock->sk; 1892 1893 if (sk->sk_prot->compat_setsockopt != NULL) 1894 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1895 optval, optlen); 1896 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1897} 1898EXPORT_SYMBOL(compat_sock_common_setsockopt); 1899#endif 1900 1901void sk_common_release(struct sock *sk) 1902{ 1903 if (sk->sk_prot->destroy) 1904 sk->sk_prot->destroy(sk); 1905 1906 /* 1907 * Observation: when sock_common_release is called, processes have 1908 * no access to socket. But net still has. 1909 * Step one, detach it from networking: 1910 * 1911 * A. Remove from hash tables. 1912 */ 1913 1914 sk->sk_prot->unhash(sk); 1915 1916 /* 1917 * In this point socket cannot receive new packets, but it is possible 1918 * that some packets are in flight because some CPU runs receiver and 1919 * did hash table lookup before we unhashed socket. They will achieve 1920 * receive queue and will be purged by socket destructor. 1921 * 1922 * Also we still have packets pending on receive queue and probably, 1923 * our own packets waiting in device queues. sock_destroy will drain 1924 * receive queue, but transmitted packets will delay socket destruction 1925 * until the last reference will be released. 1926 */ 1927 1928 sock_orphan(sk); 1929 1930 xfrm_sk_free_policy(sk); 1931 1932 sk_refcnt_debug_release(sk); 1933 sock_put(sk); 1934} 1935 1936EXPORT_SYMBOL(sk_common_release); 1937 1938static DEFINE_RWLOCK(proto_list_lock); 1939static LIST_HEAD(proto_list); 1940 1941int proto_register(struct proto *prot, int alloc_slab) 1942{ 1943 char *request_sock_slab_name = NULL; 1944 char *timewait_sock_slab_name; 1945 1946 if (sock_prot_inuse_init(prot) != 0) { 1947 printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name); 1948 goto out; 1949 } 1950 1951 if (alloc_slab) { 1952 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1953 SLAB_HWCACHE_ALIGN, NULL); 1954 1955 if (prot->slab == NULL) { 1956 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1957 prot->name); 1958 goto out_free_inuse; 1959 } 1960 1961 if (prot->rsk_prot != NULL) { 1962 static const char mask[] = "request_sock_%s"; 1963 1964 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1965 if (request_sock_slab_name == NULL) 1966 goto out_free_sock_slab; 1967 1968 sprintf(request_sock_slab_name, mask, prot->name); 1969 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 1970 prot->rsk_prot->obj_size, 0, 1971 SLAB_HWCACHE_ALIGN, NULL); 1972 1973 if (prot->rsk_prot->slab == NULL) { 1974 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 1975 prot->name); 1976 goto out_free_request_sock_slab_name; 1977 } 1978 } 1979 1980 if (prot->twsk_prot != NULL) { 1981 static const char mask[] = "tw_sock_%s"; 1982 1983 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 1984 1985 if (timewait_sock_slab_name == NULL) 1986 goto out_free_request_sock_slab; 1987 1988 sprintf(timewait_sock_slab_name, mask, prot->name); 1989 prot->twsk_prot->twsk_slab = 1990 kmem_cache_create(timewait_sock_slab_name, 1991 prot->twsk_prot->twsk_obj_size, 1992 0, SLAB_HWCACHE_ALIGN, 1993 NULL); 1994 if (prot->twsk_prot->twsk_slab == NULL) 1995 goto out_free_timewait_sock_slab_name; 1996 } 1997 } 1998 1999 write_lock(&proto_list_lock); 2000 list_add(&prot->node, &proto_list); 2001 write_unlock(&proto_list_lock); 2002 return 0; 2003 2004out_free_timewait_sock_slab_name: 2005 kfree(timewait_sock_slab_name); 2006out_free_request_sock_slab: 2007 if (prot->rsk_prot && prot->rsk_prot->slab) { 2008 kmem_cache_destroy(prot->rsk_prot->slab); 2009 prot->rsk_prot->slab = NULL; 2010 } 2011out_free_request_sock_slab_name: 2012 kfree(request_sock_slab_name); 2013out_free_sock_slab: 2014 kmem_cache_destroy(prot->slab); 2015 prot->slab = NULL; 2016out_free_inuse: 2017 sock_prot_inuse_free(prot); 2018out: 2019 return -ENOBUFS; 2020} 2021 2022EXPORT_SYMBOL(proto_register); 2023 2024void proto_unregister(struct proto *prot) 2025{ 2026 write_lock(&proto_list_lock); 2027 list_del(&prot->node); 2028 write_unlock(&proto_list_lock); 2029 2030 sock_prot_inuse_free(prot); 2031 2032 if (prot->slab != NULL) { 2033 kmem_cache_destroy(prot->slab); 2034 prot->slab = NULL; 2035 } 2036 2037 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2038 const char *name = kmem_cache_name(prot->rsk_prot->slab); 2039 2040 kmem_cache_destroy(prot->rsk_prot->slab); 2041 kfree(name); 2042 prot->rsk_prot->slab = NULL; 2043 } 2044 2045 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2046 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 2047 2048 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2049 kfree(name); 2050 prot->twsk_prot->twsk_slab = NULL; 2051 } 2052} 2053 2054EXPORT_SYMBOL(proto_unregister); 2055 2056#ifdef CONFIG_PROC_FS 2057static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2058 __acquires(proto_list_lock) 2059{ 2060 read_lock(&proto_list_lock); 2061 return seq_list_start_head(&proto_list, *pos); 2062} 2063 2064static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2065{ 2066 return seq_list_next(v, &proto_list, pos); 2067} 2068 2069static void proto_seq_stop(struct seq_file *seq, void *v) 2070 __releases(proto_list_lock) 2071{ 2072 read_unlock(&proto_list_lock); 2073} 2074 2075static char proto_method_implemented(const void *method) 2076{ 2077 return method == NULL ? 'n' : 'y'; 2078} 2079 2080static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2081{ 2082 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2083 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2084 proto->name, 2085 proto->obj_size, 2086 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 2087 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2088 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2089 proto->max_header, 2090 proto->slab == NULL ? "no" : "yes", 2091 module_name(proto->owner), 2092 proto_method_implemented(proto->close), 2093 proto_method_implemented(proto->connect), 2094 proto_method_implemented(proto->disconnect), 2095 proto_method_implemented(proto->accept), 2096 proto_method_implemented(proto->ioctl), 2097 proto_method_implemented(proto->init), 2098 proto_method_implemented(proto->destroy), 2099 proto_method_implemented(proto->shutdown), 2100 proto_method_implemented(proto->setsockopt), 2101 proto_method_implemented(proto->getsockopt), 2102 proto_method_implemented(proto->sendmsg), 2103 proto_method_implemented(proto->recvmsg), 2104 proto_method_implemented(proto->sendpage), 2105 proto_method_implemented(proto->bind), 2106 proto_method_implemented(proto->backlog_rcv), 2107 proto_method_implemented(proto->hash), 2108 proto_method_implemented(proto->unhash), 2109 proto_method_implemented(proto->get_port), 2110 proto_method_implemented(proto->enter_memory_pressure)); 2111} 2112 2113static int proto_seq_show(struct seq_file *seq, void *v) 2114{ 2115 if (v == &proto_list) 2116 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2117 "protocol", 2118 "size", 2119 "sockets", 2120 "memory", 2121 "press", 2122 "maxhdr", 2123 "slab", 2124 "module", 2125 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2126 else 2127 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2128 return 0; 2129} 2130 2131static const struct seq_operations proto_seq_ops = { 2132 .start = proto_seq_start, 2133 .next = proto_seq_next, 2134 .stop = proto_seq_stop, 2135 .show = proto_seq_show, 2136}; 2137 2138static int proto_seq_open(struct inode *inode, struct file *file) 2139{ 2140 return seq_open(file, &proto_seq_ops); 2141} 2142 2143static const struct file_operations proto_seq_fops = { 2144 .owner = THIS_MODULE, 2145 .open = proto_seq_open, 2146 .read = seq_read, 2147 .llseek = seq_lseek, 2148 .release = seq_release, 2149}; 2150 2151static int __init proto_init(void) 2152{ 2153 /* register /proc/net/protocols */ 2154 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 2155} 2156 2157subsys_initcall(proto_init); 2158 2159#endif /* PROC_FS */ 2160 2161EXPORT_SYMBOL(sk_alloc); 2162EXPORT_SYMBOL(sk_free); 2163EXPORT_SYMBOL(sk_send_sigurg); 2164EXPORT_SYMBOL(sock_alloc_send_skb); 2165EXPORT_SYMBOL(sock_init_data); 2166EXPORT_SYMBOL(sock_kfree_s); 2167EXPORT_SYMBOL(sock_kmalloc); 2168EXPORT_SYMBOL(sock_no_accept); 2169EXPORT_SYMBOL(sock_no_bind); 2170EXPORT_SYMBOL(sock_no_connect); 2171EXPORT_SYMBOL(sock_no_getname); 2172EXPORT_SYMBOL(sock_no_getsockopt); 2173EXPORT_SYMBOL(sock_no_ioctl); 2174EXPORT_SYMBOL(sock_no_listen); 2175EXPORT_SYMBOL(sock_no_mmap); 2176EXPORT_SYMBOL(sock_no_poll); 2177EXPORT_SYMBOL(sock_no_recvmsg); 2178EXPORT_SYMBOL(sock_no_sendmsg); 2179EXPORT_SYMBOL(sock_no_sendpage); 2180EXPORT_SYMBOL(sock_no_setsockopt); 2181EXPORT_SYMBOL(sock_no_shutdown); 2182EXPORT_SYMBOL(sock_no_socketpair); 2183EXPORT_SYMBOL(sock_rfree); 2184EXPORT_SYMBOL(sock_setsockopt); 2185EXPORT_SYMBOL(sock_wfree); 2186EXPORT_SYMBOL(sock_wmalloc); 2187EXPORT_SYMBOL(sock_i_uid); 2188EXPORT_SYMBOL(sock_i_ino); 2189EXPORT_SYMBOL(sysctl_optmem_max); 2190